DUMBBELL-SHAPED ASYMMETRIC BIDIRECTIONAL TAPERED THREAD CONNECTION PAIR HAVING LAGER LEFT TAPER AND SMALL RIGHT TAPER

Abstract

Disclosed is a dumbbell-shaped asymmetric bidirectional tapered thread connection pair having lager left taper and a small right taper. The internal thread (6) of the thread connection pair (10) is a bidirectional taper hole (41) on the inner surface of a cylindrical base body (2) and external thread (9) is a bidirectional truncated cone body (71) on the outer surface of a columnar base body (3). Complete unit body threads are both helical, dumbbell-shaped (94), special bidirectional cone bodies each having a lager left taper (95) than right taper (96) and being small in the middle and large at both ends. The performance mainly depends on the conical surfaces and the tapers of the threaded bodies matching with each other.

Claims

1. A dumbbell-shaped asymmetric bidirectional tapered threaded connection pair having lager left taper and a small right taper, or a dumbbell like (a left taper is greater than a right taper) asymmetric bidirectional tapered thread connection pair comprising an external thread (9) and an internal thread (6) threaded to the external thread (9); wherein a thread of the complete body of the dumbbell-shaped (left taper is greater than the right one) asymmetric bidirectional tapered thread (1) is a spiral shaped cone with small middle ends and large ends and a left taper (95) is larger than the right taper (96), including bidirectional taper hole (41) and/or bidirectional truncated cone body (71); a threaded body of the internal thread (6) is a cylindrical base body (2) with a spiral bidirectional taper hole (41) on the inner surface and presented in the form of non-solid space; the threaded body of the external thread (9) is a cylindrical matrix (3) with a spiral bidirectional truncated cone body (71) on outer surface and presented in the form of a material solid; the left taper of the asymmetric bidirectional cone forms the left taper (95) corresponding to a first taper angle (1), and the right cone forms the right taper (96) corresponding to the second taper angle (2); the left taper (95) and right taper (96) have opposite direction and different taper; the internal thread (6) and the external thread (9) pass through the cone hole to enclose the cone until the surface of the inner cone and outer cone bear on each other; a technical performance depends mainly on the taper and the taper of the threaded body; preferably, both the first taper angle (1) and the second taper angle (2) should be greater than 0 and less than 53; and for individual special fields, preferably, the first taper angle (1) is greater than or equal to 53 and less than 180.

2. The threaded connection pair of claim 1, wherein the subject dumbbell-shaped (94) bidirectional conical internal thread (6) includes the left conical surface of bidirectional taper hole (42), namely the first spiral conical surface of taper hole (421) and the right conical surface, namely the second spiral conical plane of taper hole (422) and the internal spiral (5); the first spiral conical surface of taper hole (421) and the second spiral conical plane of taper hole (422), namely the shape of bidirectional spiral cone is same with the spiral outer side of cyclotron formed by the two hypotenuses of the right-angled trapezoid combination; the right-angle side of the right-angled trapezoid combination which is a symmetric combination between top and bottom edges of two right-angled trapezoids; and the right-angled trapezoid has same bottom side and upper side but different right-angle side and coincides with the central axis of the cylindrical nut (2); the right-angled trapezoid combinations move axially at a uniform velocity along the central axis of cylindrical nut (2) simultaneously; the dumbbell-shaped (94) bidirectional conical external thread (9) includes the left conical surface of bidirectional truncated cone body (72), namely the first spiral conical surface of cone body (721) and the right conical surface, namely the second spiral conical surface of cone body (722) and the external spiral (8); the first spiral conical surface of cone body (721) and the second spiral conical surface of cone body (722), namely the shape of bidirectional spiral cone is same with the spiral outer side of cyclotron formed by the two hypotenuses of the right-angled trapezoid combination; the right-angle side of the right-angled trapezoid combination which is a symmetric combination between top and bottom edges of two right-angled trapezoids; and the right-angled trapezoid has same bottom side and upper side but different right-angle side and coincides with the central axis of the columnar base body (3); the right-angled trapezoid combinations move axially at a uniform velocity along the central axis of columnar base body (3) simultaneously.

3. The threaded connection pair of claim 2, wherein when the subject right-angled trapezoid combination turns around at a uniform velocity, a distance of the axial movement of subject right-angled trapezoid combination is at least double length of the sum of the right-angle sides of the right-angled trapezoid combination.

4. The threaded connection pair of claim 2, wherein when the subject right-angled trapezoid combination turns around at a uniform velocity, the distance of the axial movement of subject right-angled trapezoid combination is equal to the sum length of the right-angle sides of the right-angled trapezoid combination.

5. The threaded connection pair of claim 2, wherein the left conical surface and the right conical surface of bidirectional cone, namely the first spiral conical surface of taper hole (421) and the second spiral conical plane of taper hole (422) and the internal spiral (5) are all continuous spiral or discontinuous spiral and/or the first spiral conical surface of cone body (721) and the second spiral conical surface of cone body (722), and external spiral (8) are all continuous spiral or discontinuous spiral.

6. The threaded connection pair of claim 1, wherein the internal thread (6) is made of the symmetrical and mutual engaged top face of two taper holes (4), which has the same bottom surface and same top surface but different cone height and its bottom surface is on both ends of the bidirectional taper hole (41); when forming the dumbbell-shaped (94) asymmetric bidirectional taper thread (1), those engaging with the bottom surface of the adjacent bidirectional taper hole (41) respectively and/or or those to be engaged with the bottom surface of the adjacent bidirectional taper hole (41) respectively to present spiral then to become dumbbell-shaped (94) asymmetric bidirectional taper internal thread (6) are included; the subject external thread (9) is made of the symmetrical and mutual engaged top face of two cone bodies (7), which has the same bottom surface and same top surface but different cone height and its bottom surface is on both ends of the bidirectional truncated cone body (71); when forming the dumbbell-shaped (94) asymmetric bidirectional taper thread (1), those engaging with the bottom surface of the adjacent bidirectional truncated cone body (71) respectively and/or or those to be engaged with the bottom surface of the adjacent bidirectional truncated cone body (71) respectively to present spiral then to become dumbbell-shaped (94) asymmetric bidirectional taper external thread (9) are included.

7. The threaded connection pair of claim 1, wherein a large diameter of the external thread (9) is an outer angular shape structure; a small diameter of the external thread (9) is an inner angular shape structure; a large diameter of the internal thread (6) is an inner angular shape structure; a small diameter of the internal thread (6) is an outer angular shape structure; and/or a small diameter of the external thread (9) is a groove (91); a large diameter of the internal thread (6) is a groove (61) structure while both the small and large diameter of the external thread (9) are sharp angle structure; and/or the large diameter of the external thread (9) is plane or arc (92) shaped; the small diameter of the internal thread (6) is plane or arc (62) shaped; while the small diameter of the external thread (9), the large diameter of the internal thread (6) are of sharp angle structure, and/or the small diameter of the external thread (9) is groove (91), the large diameter of the internal thread (6) is groove (61) while the large diameter of the external thread (9) is plane or arc shaped; the small diameter of the internal thread (6) is plane or arc (62) shaped.

8. The threaded connection pair of claim 1, wherein the internal thread (6) and external thread (9) are formed into a thread pair (10) by means of cone pairs constituted by the bidirectional tapered hole (41) and bidirectional truncated cone body (71) coordinating with each other to fix diameter under spiral's guidance; bidirectional truncated cone body (71) and bidirectional tapered hole (41) have clearance; each section of the internal thread (6) contains the corresponding external thread (9) coaxially and by centering and sizing to constitute a pair of sliding bearing; the thread connection pair is constituted by a pair or several pairs of sliding bearing; the internal thread (6) and the external thread (9) bidirectionally joint with each other effectively, that is, bidirectional contact and clasp with each other effectively to contain or be contained thread section; the internal thread (6) taper hole (4) contains external thread (9) cone body (7) bi-directionally and positioning multi-directionally on radial, circumferential, axial and angular etc; each section of the internal thread (6) and the external thread (9) includes one side bidirectional load bearing and/or left and right sides bidirectional load bearing.

9. The threaded connection pair of claim 1, wherein the internal thread (6) and external thread (9) form into a thread pair (10) by means of the coordination of the first spiral conical surface of taper hole (421) and the first spiral conical surface of cone body (721) and the second spiral conical surface of cone body (722) uses the interface as bearing; and under the guidance of spiral, internal cone and external cone self adjust until conical surface of bidirectional taper hole (42) and conical surface of bidirectional truncated cone body hug with each other to achieve the spiral conical surface in one direction bearing and/or the spiral conical surface two directions bearing at the same time and/or until in fix-diameter and self-position contact and/or in fix-diameter interference.

10. The threaded connection pair of claim 1, wherein the columnar base body is solid or hollow; the base body comprises cylinder and/or non-cylinder workpieces and objects which are required to be processed for bidirectional spiral external thread (9) on its outer surface; the cylindrical base body (2) is comprises cylinder body and/or non-cylinder workpieces and objects which are required to be processed for bidirectional spiral internal thread (6) on its inner surface; the outer surface and/or inner surface is cylinder surface and/or cone surface including non-cylinder surface or surface geometry.

11. The threaded connection pair of claim 1, wherein the internal thread (6) and/or external thread (9) comprises single threaded body with incomplete taper geometry, that is, single thread body is incomplete unit body thread.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Exemplary embodiments of this invention are explained below with the aid of the schematic drawings, in which:

[0054] FIG. 1 shows a first exemplary embodiment of the invention, in which the dumbbell-shaped asymmetric bidirectional tapered thread connection pair having a lager left taper and a small right taper.

[0055] FIG. 2 shows a first exemplary embodiment of the invention, in which the external thread and external thread integrated unit of the dumbbell-shaped asymmetric bidirectional tapered thread having a lager left taper and a small right taper.

[0056] FIG. 3 shows a first exemplary embodiment of the invention, in which the internal thread and internal thread integrated unit of the dumbbell-shaped asymmetric bidirectional tapered thread having a lager left taper and a small right taper.

[0057] FIG. 4 shows a second exemplary embodiment of the invention, in which the dumbbell-shaped asymmetric bidirectional tapered thread connection pair having a lager left taper and a small right taper.

[0058] FIG. 5 shows a third exemplary embodiment of the invention, in which the dumbbell-shaped asymmetric bidirectional tapered thread connection pair having a lager left taper and a small right taper.

[0059] FIG. 6 shows a fourth exemplary embodiment of the invention, in which the dumbbell-shaped asymmetric bidirectional tapered thread connection pair having a lager left taper and a small right taper.

[0060] FIG. 7 shows a fifth exemplary embodiment of the invention, in which the dumbbell-shaped asymmetric bidirectional tapered thread connection pair having a lager left taper and a small right taper.

[0061] FIG. 8 shows the background technology involved of the invention, in which the thread of the existing thread technology is the bevel of cylinder or taper surface.

[0062] FIG. 9 shows the background technology involved of the invention, in which the model of bevel module of existing thread technology-bevel principle.

[0063] FIG. 10 shows the background technology involved of the invention, in which the spiral angle of existing thread technology.

[0064] Elements of the same design and function are labeled with the same reference symbol as following throughout the drawings: [0065] tapered thread 1; [0066] cylindrical base body 2; [0067] nut body 21; [0068] columnar base body 3; [0069] screw body 31; [0070] taper hole 4; [0071] bidirectional taper hole 41; [0072] conical surface of bidirectional taper hole 42; [0073] the first spiral conical surface of taper hole 421; [0074] the first taper angle 1; [0075] the second spiral conical surface of taper hole 422; [0076] the second taper angle 2; [0077] internal spiral 5; [0078] internal thread 6; [0079] internal thread groove of bidirectional taper hole 61; [0080] internal thread surface or arc of bidirectional taper hole 62; [0081] cone body 7; [0082] bidirectional truncated cone base body 71; [0083] conical surface of bidirectional truncated cone body 72; [0084] the first spiral conical surface of cone body 721; [0085] the first taper angle 1; [0086] the second spiral conical surface of cone body 722; [0087] the second taper angle 2; [0088] External spiral 8; [0089] External thread 9; [0090] external thread groove of bidirectional taper hole 91; [0091] External thread surface or arc of bidirectional taper hole 92; [0092] dumbbell-shaped 94; [0093] left taper 95; [0094] right taper 96; [0095] left distribution 97; [0096] Right distribution 98; [0097] thread connection pair and/or thread pair 10; [0098] clearance 101; [0099] taper axis 01; [0100] thread axis 02; [0101] slider on inclined surface A; [0102] Clinohedral B; [0103] gravity G; [0104] gravity along bevel G1; [0105] force of friction F; [0106] spiral angle ; [0107] equivalent angle of friction P; [0108] major diameter of conventional external thread d; [0109] minor diameter of conventional external thread d1; [0110] media diameter of conventional external thread d2.

DETAILED DESCRIPTION OF EMBODIMENTS

[0111] The following is a further detailed illustration of the invention combined schematic drawings with the attached drawings and concrete implementing ways.

Exemplary Embodiment 1

[0112] As shown in FIGS. 1, 2 and 3, the dumbbell-shaped asymmetric bidirectional tapered thread connection pair includes spiraling bidirectional truncated cone body 71 distributed on outer surface of columnar base body 3 and spiraling bidirectional taper hole 41 distributed on inner surface of cylindrical base body 2. That is, includes the external thread 9 and internal thread 6 concerting with each other. The distribution of the internal thread 6 is spiraling bidirectional taper hole 41 with incorporeal space form, and the distribution of the external thread 9 is spiraling bidirectional cone base body 71 with material entities form. The internal thread 6 and the external thread 9 is the relationship between female parts and male parts. The internal thread 6 and external thread 9 are sections of bidirectional conical geometry that rotate and socket together and hold until interference fit. That is, bidirectional taper hole 41 contains bidirectional truncated cone body 71 section by section, and inclusive bi-directionally and limits the disordered freedom between taper hole 4 and cone body 7, while the spiral motion makes asymmetric bidirectional tapered thread connection pair 10 to obtain necessary ordered degrees of freedom, to synthesize the technical characteristics of cone pair and thread pair.

[0113] During the use of dumbbell-shaped asymmetric bidirectional tapered thread connection pair in this embodiment, the conical surface of bidirectional cone body 72 and the conical surface of bidirectional taper hole 42 cooperate with each other.

[0114] In this embodiment, the cone body 7 and/or taper hole 4 of the dumbbell-shaped asymmetric bidirectional tapered thread connection pair reach a certain taper. That is, not until the taper body that forms to taper pair reaches a certain taper angle, the asymmetric bidirectional tapered thread connection pair 10 has ability of self-locking and self-positioning. The taper comprises the left taper 95 and the right taper 96. The taper angle comprises the left taper angle and the right taper angle. The asymmetric bidirectional taper thread 1 has the greater left taper 95 and smaller right taper 96. The left taper 95 corresponds to the left taper angle, namely the first taper angle 1. Preferably, 0<1<53. And more preferably, the first taper angle 1 should be valued between 240. And for individual special fields where self-locking and/or self-positioning requirements are weak and/or high axial bearing capacity requirements are not required, preferably, 531<180, preferably, the first taper angle 1 should be valued between 5390. The right taper 96 corresponds to the right taper angle, namely the second taper angle 2. Preferably, 0<2<53. And more preferably, the second taper angle 2 should be valued between 240.

[0115] The external thread 9 is arranged on the external surface of the columnar base body 3, is characterized in that: the columnar base body 3 has screw body 31, and the outer surface of the screw body 31 has a cone body 7 with spiral distribution. The cone body 7 comprises an asymmetric bidirectional truncated cone body 71. The asymmetrical bidirectional truncated cone body 71 is a special bidirectional taper geometry with dumbbell-shaped 94. The columnar base body 3 can be solid or hollow, including the cylinder body, the cone body, the pipe body etc.

[0116] The dumbbell-shaped 94 asymmetric bidirectional truncated cone body 71, is characterized in that it is made of the symmetrical and mutual engaged and spiral top face of two cone bodies, which has the same bottom surface and same top surface but different cone height and the left taper of the left cone body is larger than the right taper of the right cone body. And also, the bottom surface is at the end of the bidirectional truncated cone body 71 and when to form the dumbbell-shaped 94 asymmetric bidirectional taper thread 1, those engaging with the bottom surface of the adjacent bidirectional cone body 71 respectively and/or or those to be engaged with the bottom surface of the adjacent bidirectional cone body 71 respectively are included. The outer surface of cone body 7 has conical surface of asymmetric bidirectional cone body 72. The subject external thread 9 is made of the first spiral conical surface 721 and the second spiral conical surface 722 of cone body and the external spiral 8. Within the cross section passing through the thread axis 02, the complete single asymmetric bidirectional taper external thread 9 is a dumbbell-shaped 94 special bidirectional conical geometry with small in the middle and large at both ends and a greater taper of the left cone than that of the right cone. The angle between two prime lines on the left conical surface, namely the first spiral conical surface of cone body 721 of the bidirectional truncated cone body 71 is called the first taper angle 1. The first spiral conical surface of cone body 721 forms into left taper 95 corresponding to the first taper angle 1 and with right distribution 98. The angle between two prime lines on the right conical surface, namely the second spiral conical surface of cone body 722 of the bidirectional truncated cone body 72 is called the second taper angle 2. The second spiral conical surface of cone body 722 forms into right taper 96 corresponding to the second taper angle 2 and with left distribution 97. The subject first taper angle 1 is in the direction of the taper to the second taper angle 2. The prime line is intersected between the cone surface and the surface passing through the taper axis 01. The shape formed by the first spiral conical surface of cone body 721 and the second spiral conical surface of cone body 722 of the bidirectional cone body 71 is same with the spiral outer side of cyclotron formed by the two hypotenuses of the right-angled trapezoid combination. The right-angle side of the right-angled trapezoid combination is a symmetric combination from upper edges of two right-angled trapezoids. And the right-angled trapezoid has same bottom side and upper side but different right-angle side and coincides with the central axis of the columnar base body 3. Besides, the right-angled trapezoid combinations move axially at a uniform velocity along the central axis of columnar base body 3 simultaneously. The rectangular trapezoid combination refers to a special geometry body with the upper and lower sides of two rectangular trapezoids having the same lower side and same upper side but different right angled sides, the upper sides of which are symmetric and mutually engaged, and the lower sides are respectively at the both ends of the rectangular trapezoid combination.

[0117] The internal thread 6 is arranged on the inner surface of cylindrical base body 2, which is characterized by that the cylindrical base body 2 has a nut body 21. The inner surface of the nut body 21 has a taper hole 4 with helical distribution. The taper hole 4 comprises an asymmetric bidirectional taper hole 41, which is a special bidirectional taper geometry with dumbbell-shaped 94. The cylindrical base body 2 comprises the cylinder body and/or the non-cylinder body and other workpieces and objects whose internal threads are required to be machined on its inner surface.

[0118] The dumbbell-shaped 94 asymmetric bidirectional taper hole 41, is characterized in that it is made of the symmetrical and mutual engaged and spiral shape top face of two taper holes, which has the same bottom surface and same top surface but different cone height and the left taper of the left taper hole is larger than the right taper of the right taper hole. And also, the bottom surface is at the end of the bidirectional taper hole 41 and when to form the dumbbell-shaped 94 asymmetric bidirectional taper thread 1, those engaging with the bottom surface of the adjacent bidirectional taper hole 41 respectively and/or or those to be engaged with the bottom surface of the adjacent bidirectional taper hole 41. The taper hole 41 comprises the conical surface of asymmetric bidirectional taper hole 42. The subject internal thread 6 is made up of the first spiral conical surface 421 and the second spiral conical surface 422 of taper hole and the internal spiral 5. Within the cross section passing through the thread axis 02, the complete single asymmetric bidirectional taper internal thread 6 is a dumbbell-shaped 94 special bidirectional conical geometry with small in the middle and large at both ends and a greater taper of the left taper hole than that of the right cone. The angle between two prime lines on the left conical surface, namely the first spiral conical surface of taper hole 421 of the bidirectional taper hole 41 is called the first taper angle 1. The first spiral conical surface of taper hole 421 forms into left taper 95 corresponding to the first taper angle 1 and with right distribution 98. The angle between two prime lines on the right conical surface, namely the second spiral conical surface of taper hole 422 of the bidirectional taper hole 42 is called the second taper angle 2. The second spiral conical surface of taper hole 422 forms into right taper 96 corresponding to the second taper angle 2 and with left distribution 97. The subject first taper angle 1 is in the direction of the taper to the second taper angle 2. The prime line is intersected between the cone surface and the surface passing through the taper axis 01. The shape formed by the first spiral conical surface of taper body 421 and the second spiral conical surface of taper hole 422 of the bidirectional taper hole 41 is same with the spiral outer side of cyclotron formed by the two hypotenuses of the right-angled trapezoid combination. The right-angle side of the right-angled trapezoid combination is a symmetric combination from upper edges of two right-angled trapezoids. And the right-angled trapezoid has same bottom side and upper side but different right-angle side and coincides with the central axis of the cylindrical base body 2. Besides, the right-angled trapezoid combinations move axially at a uniform velocity along the central axis of cylindrical base body 2 simultaneously. The rectangular trapezoid combination refers to a special geometry body with the upper and lower sides of two rectangular trapezoids having the same lower side and same upper side but different right angled sides, the upper sides of which are symmetric and mutually engaged, and the lower sides are respectively at the both ends of the rectangular trapezoid combination.

[0119] In subject embodiment of dumbbell-shaped asymmetric bidirectional tapered thread connection pair, the joint of adjacent spiral conical surface of external thread 9 and internal thread 6 adopt the form of sharp angles linkage. The sharp angle is relatively to the non-sharp angle, which refers to the structural form without special non-sharp angle treatment.

[0120] The dumbbell-shaped 94 bidirectional cone body 71 and bidirectional taper hole 41, is characterized in that, the joint between the first spiral conical surface of cone boy 721 and the second spiral conical surface of cone boy 722 of the same spiraling bidirectional cone body 71, that is, the minor diameter of the external thread 9 adopts the structure of inner sharp angle and forms the external spiral 8 with spiral distribution. The joint between the first spiral conical surface of the cone body 721 of the bidirectional truncated cone body 71 and the second spiral conical surface of the cone body 722 of the adjacent bidirectional truncated cone body 71, and/or the joint between the second spiral conical surface of the cone body 722 of the bidirectional truncated cone body 71 and the first spiral conical surface of the cone body 721 of the adjacent bidirectional truncated cone body 71, that is, the major diameter of the external thread 9 is connected with the external sharp angle structure and forms an external spiral 8 with spiral distribution. The joint between the first spiral conical surface of the taper hole 421 and the second spiral conical surface of the taper hole 422 of the bidirectional taper hole 41, that is, the minor diameter of the internal thread 6 adopts the structure of outer sharp angle and forms the internal spiral 5 with spiral distribution. The joint between the first spiral conical surface of the taper hole 421 of the bidirectional taper hole 41 and the second spiral conical surface of the taper hole 422 of the adjacent bidirectional taper hole 41, and/or the joint between the second spiral conical surface of the taper hole 422 of the bidirectional taper hole 41 and the first spiral conical surface of the taper hole 421 of the adjacent bidirectional taper hole 41, that is, the major diameter of the internal thread 6 is connected with the internal sharp angle structure and forms an internal spiral 5 with spiral distribution. In this way, the taper thread 1 would have more compact structure and higher strength and larger bearing capacity, as well as with good mechanical connection, locking, sealing performance, and more spacious machining physical space.

[0121] The dumbbell-shaped asymmetric bidirectional tapered thread connection pair is on transmitted through the rotary connection and bidirectional bearing of bidirectional taper hole 41 and bidirectional truncated cone body 71. There must be a clearance 101 between internal thread 6 and external thread 9 when they form to thread pair 10. That is, there should be a clearance 101 between the bidirectional taper hole 41 and bidirectional truncated cone body 71. If there is oil and other media lubrication between them, it will form a bearing oil film easily. The clearance 101 is conducive to the formation of bearing oil film. The dumbbell-shaped asymmetric bidirectional tapered thread connection pairs 10 are used for drive connections equivalent to a set of sliding bearing pairs consisting of one pair and/or several pairs of sliding bearings. That is, each section of bidirectional tapered internal thread 6 bidirectional corresponds to one section of the bidirectional cone external thread 9 inclusively to form a pair of sliding bearings, the number of which is adjusted according to the application condition. That is, the bidirectional conical internal thread 6 and the bidirectional conical external thread 9 bi-directionally contact and clasp with each other effectively to contain or be contained thread section. To design in accordance with the working conditions, the bidirectional conical internal thread 6 contains the bidirectional conical external thread 9 and assisted by multi-positioning such as radial, axial, angular, circumferential etc. Thus, forming the special synthetic technique of the taper pair and thread pair to ensure the accuracy, efficiency and reliability of the taper thread technique, especially the dumbbell-shaped asymmetric bidirectional tapered thread connection pair 10.

[0122] When the dumbbell-shaped asymmetric bidirectional tapered thread connection pair is on fastening connection and sealing connection, the technical properties of connection, locking, anti-loosing, bearing and sealing are realized through the rotary connection of bidirectional taper hole 41 and bidirectional truncated cone body 71. That is, the first spiral conical surface of cone body 721 and the first spiral conical surface of the taper hole 421 are fixed straight up to interference, and/or the second spiral conical surface of the cone body 722 and the second spiral conical surface of taper hole 422 are fixed straight up to interference. According to the application conditions, to achieve the one direction load and/or both directions can be carried at the same time, that is, under the guidance of the spiral, the bidirectional truncated cone body 71 and the bidirectional taper hole 41 are centering on the inner cone and the outer cone, until the first spiral conical surface of the taper hole 421 and the first spiral conical surface of the cone body 721 are locked to carry in one direction or both directions at the same time, to carry the diameter matching or until the diameter is in interference contact. And/or the second spiral conical surface of the taper hole 422 and the second spiral conical surface of the cone body 722 are locked to carry in one direction or both directions at the same time, to carry the diameter matching or until the diameter is in interference contact. Thus, to achieve the technical performance of mechanical mechanism such as connection, locking, anti-loose, bearing and sealing etc.

[0123] Therefore, technical properties of the dumbbell-shaped asymmetric bidirectional conical thread connection pair such as driving accuracy and efficiency, bearing capacity, self-locking force, anti-loose capacity, sealing performance is related to following: the first spiral conical surface of cone body 721 and its formed left taper 95, namely the first taper angle 1; the second spiral conical surface of cone body 722 and its formed right taper 96, namely the second taper angle 2; the first spiral conical surface of taper hole 421 and its formed left taper 95, namely the first taper angle 1; the second spiral conical surface of taper hole 422 and its formed right taper 96, namely the second taper angle 2. The material friction coefficient, machining quality and application condition of columnar base body 3 and cylindrical base body 2 also have an effect on it.

[0124] In the dumbbell-shaped asymmetric bidirectional tapered thread connection pair, the subject right-angled trapezoid combination turns around at a uniform velocity, the distance of the axial movement of subject right-angled trapezoid combination is at least double length of the sum of the right-angle sides of the two right-angled trapezoids, which have the same bottom side and upper side but different right-angle sides. The structure ensures that the first spiral conical surface 721 and the second spiral conical surface 722 of the cone body, and the first spiral conical surface 421 and the second spiral conical surface 422 of the taper hole have sufficient length. In this way, the conical surface of the bidirectional truncated cone body 72 and the conical surface of the bidirectional taper hole 42 can have enough effective contact area and strength as well as the efficiency required by the spiral motion.

[0125] In the dumbbell-shaped asymmetric bidirectional tapered thread connection pair, the subject right-angled trapezoid combination turns around at a uniform velocity, the distance of the axial movement of subject right-angled trapezoid combination is equal to the sum of the right-angle sides of the two right-angled trapezoids, which have the same bottom side and upper side but different right-angle sides. The structure ensures that the first spiral conical surface 721 and the second spiral conical surface 722 of the cone body, and the first spiral conical surface 421 and the second spiral conical surface 422 of the taper hole have sufficient length. In this way, the conical surface of the bidirectional truncated cone body 72 and the conical surface of the bidirectional taper hole 42 can have enough effective contact area and strength as well as the efficiency required by the spiral motion.

[0126] In subject dumbbell-shaped asymmetric bidirectional tapered thread connection pair, the first spiral conical surface 721 and the second spiral conical surface 722 of the cone body are both continuous helical or discontinuous helical surfaces. The first spiral conical surface 421 and the second spiral conical surface 422 of the taper hole are both continuous helical or discontinuous helical surfaces. Preferably, the first spiral conical surface 721 and the second spiral conical surface 722 of the cone body, and the first spiral conical surface 421 and the second spiral conical surface 422 of the taper hole here are all continuous helical surfaces.

[0127] In the dumbbell-shaped asymmetric bidirectional tapered thread connection pair, when the connecting hole of the cylindrical base body 2 is screwed into the connecting end of the columnar base body 3, there is a requirement for the direction of screw-in, that is, the connecting hole of the cylindrical base body 2 cannot be screwed in the opposite direction.

[0128] In subject dumbbell-shaped asymmetric bidirectional tapered thread connection pair, one end of the columnar base body 3 is provided with the size which is larger than the head of outer diameter of the columnar base body 3. And/or one end and/or two ends of the columnar base body 3 are all provided with the size which is smaller than the head of bidirectional taper external thread 9 minor diameter of columnar base body 3 screw body 31. The connection hole is a threaded hole arranged on a nut body 21. That is, the columnar base body 31 connecting to the head is considered as bolt, and those without the head and/or the two ends of the head are smaller than the diameter of the bidirectional taper external thread 9 and/or without thread in the middle but with bidirectional taper external thread 9 at the both ends are studs. The connection hole is arranged in the nut body 21.

[0129] Compared with the existing technology, the advantages of this kind of dumbbell-shaped asymmetric double tapered thread connection pair are as following:

[0130] Reasonable design;

[0131] Simple structure;

[0132] To realize the functions of fastening and connecting by the bidirectional bearing or fix-diameter of thread pairs until interference fit. The thread pairs is formed by the centering of coaxial inner and outer diameters of inner and outer cone.

[0133] Easy operation;

[0134] Large locking force;

[0135] Large bearing force;

[0136] Good anti-loose performance;

[0137] High transmission efficiency and precision;

[0138] Good mechanical sealing efficiency;

[0139] Good stability;

[0140] Can prevent looseness when connecting;

[0141] With self-locking and self-positioning functions.

Exemplary Embodiment 2

[0142] As shown in FIG. 4, the structure, principle and implementation steps of this embodiment are similar to those of Embodiment 1. The difference is the minor diameter of the external thread 9 is treated with the external helix structure connected with the groove 91, and the outer helix structure is a special external spiral 8. The major diameter of the internal thread 6, namely the joint of the adjacent spiral conical surface, is treated with the internal helix structure connected with the groove 61. The inner helix structure is a special internal spiral 5, which can avoid interference between the internal thread 6 and the external thread 9 when rotating together, and also store oil and reservoir pollution.

Exemplary Embodiment 3

[0143] As shown in FIG. 5, the structure, principle and implementation steps of this embodiment are similar to those of Embodiment 1. The difference is the major diameter of the external thread 9, namely the joint of the adjacent spiral conical surface is treated with the external helix structure connected with the plane or arc 92, and the outer helix structure is a special external spiral 8. The minor diameter of the internal thread 6 is treated with the internal helix structure connected with the plane or arc 62. The inner helix structure is a special internal spiral 5, which can avoid interference between the internal thread 6 and the external thread 9 when rotating together, and also store oil and reservoir pollution.

Exemplary Embodiment 4

[0144] As shown in FIG. 6, the structure, principle and implementation steps of this embodiment are similar to those of Embodiment 1. The difference is the minor diameter of the external thread 9 is treated with the external helix structure connected with the groove 91. The major diameter of the external thread 9, namely the joint of the adjacent spiral conical surface is treated with the external helix structure connected with the plane or arc 92. The outer helix structure is a special external spiral 8. The thread pair 10 is constituted by the special external spiral 8 and the internal thread 6. Both the minor and major diameter of internal thread 6 use sharp angle for connection to avoid the possible R angle, which can avoid interference between the internal thread 6 and the external thread 9 when rotating together, and also can store oil and reservoir pollution.

Exemplary Embodiment 5

[0145] As shown in FIG. 7, the structure, principle and implementation steps of this embodiment are similar to those of Embodiment 1. The difference is the major diameter of the internal thread 6, namely the joint of the adjacent spiral conical surface is treated with the internal helix structure connected with groove 61. The minor diameter of the internal thread 6 is treated with the internal helix structure connected with the plane or arc 62. The inner helix structure is a special internal spiral 5. The thread pair 10 is constituted by the special internal spiral 5 and the external thread 9. Both the minor and major diameter of external thread 9 use sharp angle for connection to avoid the possible R angle, which can avoid interference between the internal thread 6 and the external thread 9 when rotating together, and also store oil and reservoir pollution.

[0146] The specific embodiments described herein are merely illustrative of the spirit of the invention. The technical personnel in the technical field of the invention may make various modifications or additions to the specific embodiments described or replace them in a similar manner, but without deviating from the spirit of the invention or going beyond the scope defined in the attached claims.

[0147] Although below terms are used a lot in this article: tapered thread 1, cylindrical base body 2, nut body 21, columnar base body 3, screw body 31, taper hole 4, bidirectional taper hole 41, conical surface of bidirectional taper hole 42, the first spiral conical surface of taper hole 421, the first taper angle 1, the second spiral conical surface of taper hole 422, the second taper angle 2, internal spiral 5, internal thread 6, internal thread groove of bidirectional taper hole 61, internal thread surface or arc of bidirectional taper hole 62, cone body 7, bidirectional truncated cone base body 71, conical surface of bidirectional truncated cone body 72, the first spiral conical surface of cone body 721, the first taper angle 1, the second spiral conical surface of cone body 722, the second taper angle 2, external spiral 8, external thread 9; external thread groove of bidirectional taper hole 91, external thread surface or arc of bidirectional taper hole 92, dumbbell-shaped 94, left taper 95, right taper 96, left distribution 97, right distribution 98, thread connection pair and/or thread pair 10, clearance 101, self-locking force self-locking self-positioning, pressure, taper axis 01, thread axis 02, mirror, axle sleeve, axis, the entity space, material entity, single taper, bidirectional taper, cone, internal cone, taper hole, external cone, taper, taper pair, spiral structure, spiral motion, thread body, complete unit thread, axis force, axis force angle, anti-axis force, anti-axis force angle, centripetal force, anti-centripetal force, reverse collinear force, internal stress, bidirectional force, one-way force, sliding bearing, sliding bearing pair etc. However, the possibility of using other terms does not preclude the use of such terms. Using those terms are merely for the purpose of more convenient description and explanation of the nature of the present invention. It would be contrary to the spirit of the present invention to interpret them as any additional limitation.