ROLLER

Abstract

Provided is a roller, and more particularly, to a rotary shaft of the upper part of a rolling wheel, having an inclined surface formed along the circumference of an outer diametral surface thereof, is inserted into at least one coupling groove formed on a transfer bracket, a thrust member is provided at the upper part of the rotary shaft so as to allow a thrust load to be concentrated on the upper end of the rotary shaft or the thrust member, and a radial member is provided at the inner surface of the coupling groove and the rotary shaft positioned at the lower part of the thrust member, thereby supporting a radial load.

Claims

1. A roller wherein a rotational shaft at an upper part of a rolling wheel having a slanted surface formed on a circumference of an outer diametral surface is inserted into one or more coupling grooves formed in a transfer bracket and a thrust member is installed at the upper part of the rotational shaft to allow a thrust load to concentrate on the top of the rotational shaft or the thrust member and a radial member is installed on inner surfaces of the rotational shaft and a coupling groove positioned at the lower part of the thrust member to support a radial load.

2. The roller of claim 1, wherein an upper wheel of the thrust member is closely attached or coupled and fixed onto the bottom of the coupling groove and a rotation hole of a lower wheel of the thrust member is inserted into a vertical step portion formed on the top of the rotational shaft to slip while maintaining a contact or inserted and thereafter, coupled and fixed and the lower wheel of the thrust member is seated on a horizontal step portion.

3. The roller of claim 1, wherein the upper wheel of the thrust member is closely attached or coupled and fixed onto the bottom of the coupling groove and the top of the rotational shaft is rounded to form a round portion and an inner diametral surface of a rotation hole of the lower wheel of the thrust member is rounded to slip while maintaining the contact by engaging with the round portion.

4. The roller of claim 1, wherein the upper wheel of the thrust member is closely attached or coupled and fixed onto the bottom of the coupling groove and the rotation hole of the lower wheel of the thrust member is inserted into a taper portion on the top of the rotational shaft which is tapered up toward a center point to slip while maintaining the contact or inserted and thereafter, coupled and fixed.

5. The roller of claim 1, wherein the upper wheel of the thrust member is closely attached or coupled and fixed onto the bottom of the coupling groove and after a first fixation groove is formed at the center of the bottom of the lower wheel of the thrust member formed as a disk, the top of the rotational shaft is inserted and coupled into the first fixation groove, and as a result, while the top of the rotational shaft is inserted into the first fixation groove to maintain the contact, the top of the rotational shaft slips or inserted and thereafter, coupled and fixed.

6. The roller of claim 5, wherein the top of the rotational shaft is tapered or rounded up toward the center and the first fixation groove has a groove shape corresponding to the shape of the rotational shaft.

7. The roller of claim 1, wherein the upper wheel of the thrust member is closely attached or coupled and fixed onto the bottom of the coupling groove, a fixation shaft is formed downward at the center of the bottom of the lower wheel of the thrust member formed as the disk, and a second fixation groove is formed on the top of the rotational shaft, and as a result, while a second fixation groove is formed on the top of the rotational shaft and the fixation shaft is inserted into the second fixation groove to maintain the contact, the fixation shaft slips or is inserted and thereafter, coupled and fixed.

8. The roller of claim 7, wherein the fixation shaft is tapered or rounded down or the second fixation groove has the groove shape corresponding to the shape of the fixation shaft.

9. The roller of claim 1, wherein the radial member installed in the coupling groove is configured by combining at least one or more single or multiple types of an opening type, a single-surface shield type, a both-surface shield type, a single-surface sealing type, and a both-surface sealing type.

10. The roller of claim 1, wherein the thrust member installed in the coupling groove is configured by combining at least one single or multiple bearings of a thrust bearing, an angular bearing, an automatic centering bearing, a taper bearing, and an oilless bearing.

11. The roller of claim 1, wherein the radial member installed in the coupling groove is configured by combining at least one single or multiple bearings of a radial bearing, the automatic centering bearing, the taper bearing, the oilless bearing, at least one pin caster or pin ball, and a needle bearing.

12. The roller of claim 1, further comprising: a shield panel having a shield hole penetrated by the rotational shaft in order to prevent foreign materials or polluted materials from flowing in the coupling groove and coupled to a lower part of the coupling groove.

13. A roller wherein a rotational shaft at an upper part of a rolling wheel having a slanted surface formed on a circumference of an outer diametral surface is inserted into one or more coupling holes formed to penetrate vertically in a transfer bracket and a thrust member is installed between the bottom of a cover part coupled to an upper part of the coupling hole and the upper part of the rotational shaft to allow a thrust load to concentrate on the top of the rotational shaft or the thrust member and a radial member is installed on inner surfaces of the rotational shaft and the coupling hole positioned at the lower part of the thrust member to support a radial load.

14. The roller of claim 13, wherein an upper wheel of the thrust member is closely attached or coupled and fixed onto the bottom of the cover part coupled at the upper part of the coupling hole and a rotation hole of a lower wheel of the thrust member is inserted into a vertical step portion formed on the top of the rotational shaft to slip while maintaining a contact or inserted and thereafter, coupled and fixed and the lower wheel of the thrust member is seated on a horizontal step portion.

15. The roller of claim 13, wherein the upper wheel of the thrust member is closely attached or coupled and fixed onto the bottom of the cover part coupled to the coupling hole and the top of the rotational shaft is rounded to form a round portion and an inner diametral surface of a rotation hole of the lower wheel of the thrust member is rounded to slip while maintaining the contact by engaging with the round portion.

16. The roller of claim 13, wherein the upper wheel of the thrust member is closely attached or coupled and fixed onto the bottom of the cover part coupled to the upper part of the coupling hole and the rotation hole of the lower wheel of the thrust member is inserted into a taper portion on the top of the rotational shaft which is tapered up toward a center point to slip while maintaining the contact or inserted and thereafter, coupled and fixed.

17. The roller of claim 13, wherein the upper wheel of the thrust member is closed attached or coupled and fixed onto the bottom of the cover part coupled to the upper part of the coupling hole and after a first fixation groove is formed at the center of the bottom of the lower wheel of the thrust member formed as a disk, the top of the rotational shaft is inserted and coupled into the first fixation groove, and as a result, while the top of the rotational shaft is inserted into the first fixation groove to maintain the contact, the top of the rotational shaft slips or inserted and thereafter, coupled and fixed.

18. The roller of claim 17, wherein the top of the rotational shaft is tapered or rounded up toward the center and the first fixation groove has a groove shape corresponding to the shape of the rotational shaft.

19. The roller of claim 13, wherein the upper wheel of the thrust member is closely attached or coupled and fixed onto the bottom of the cover part coupled to the upper part of the coupling hole, a fixation shaft is formed downward at the center of the bottom of the lower wheel of the thrust member formed as the disk, and a second fixation groove is formed on the top of the rotational shaft, and as a result, while a second fixation groove is formed on the top of the rotational shaft and the fixation shaft is inserted into the second fixation groove to maintain the contact, the fixation shaft slips or is inserted and thereafter, coupled and fixed.

20. The roller of claim 19, wherein the fixation shaft is tapered or rounded down or the second fixation groove has the groove shape corresponding to the shape of the fixation shaft.

21. The roller of claim 13, wherein the radial member installed in the coupling hole is configured by combining at least one single or multiple types of an opening type, a single-surface shield type, a both-surface shield type, a single-surface sealing type, and a both-surface sealing type.

22. The roller of claim 13, wherein the thrust member installed in the coupling hole is configured by combining at least one single or multiple types of a thrust bearing, an angular bearing, an automatic centering bearing, a taper bearing, and an oilless bearing.

23. The roller of claim 13, wherein the radial member installed in the coupling hole is configured by combining at least one single or multiple bearings of a radial bearing, the automatic centering bearing, the taper bearing, the oilless bearing, at least one pin caster or pin ball, and a needle bearing.

24. The roller of claim 13, further comprising: a shield panel having a shield hole penetrated by the rotational shaft in order to prevent foreign materials or polluted materials from flowing in the coupling hole and coupled to a lower part of the coupling hole.

Description

DESCRIPTION OF DRAWINGS

[0053] FIG. 1A is a diagram illustrating a structure of a roller in the related art.

[0054] FIG. 1B is a diagram of omitting a cross-sectional display of FIG. 1A in order to illustrate an action state of the roller in the related art.

[0055] FIG. 1C is an enlarged diagram of part A of FIG. 1A illustrating a state of a thrust member when an inclined surface rolling wheel of the roller in the related art is laterally thrust.

[0056] FIG. 2 is a diagram illustrating a roller in which a coupling groove is formed in a transfer bracket according to a first embodiment of the present disclosure.

[0057] FIG. 3 is a diagram illustrating a structure of the roller in which a coupling hole is formed in the transfer bracket according to the first embodiment of the present disclosure.

[0058] FIG. 4 is a diagram illustrating a structure of a roller according to a second embodiment of the present disclosure.

[0059] FIG. 5 is a diagram illustrating a structure of a roller according to a third embodiment of the present disclosure.

[0060] FIG. 6 is a diagram illustrating a structure of a roller according to a fourth embodiment of the present disclosure.

[0061] FIG. 7 is a diagram illustrating a structure of a roller according to a fifth embodiment of the present disclosure.

DESCRIPTION OF MAIN REFERENCE NUMERALS OF DRAWINGS

[0062] 110: Rolling wheel

[0063] 112: Rotational shaft

[0064] 114: Inclined surface

[0065] 116a, 116b: horizontal step portion, vertical step portion

[0066] 118: Taper portion

[0067] 119: Second fixation groove

[0068] 120: Transfer bracket

[0069] 122: Coupling groove

[0070] 124: Coupling hole

[0071] 126: Cover part

[0072] 130: Guide rail

[0073] 140: Radial member

[0074] 142: Outer wheel of radial member

[0075] 144: Inner wheel of radial member

[0076] 150: Thrust member

[0077] 152: Upper wheel of thrust member

[0078] 154: Lower wheel of thrust member

[0079] 156: First fixation groove

[0080] 158: Fixation shaft

[0081] 160: Shield panel

[0082] 162: Shield hole

BEST MODE

[0083] Hereinafter, a configuration of the present disclosure will be described below with reference to FIGS. 2 to 7 which are accompanied.

[0084] A rolling wheel 110 according to the present disclosure illustrated in FIG. 2 has an inclined surface 114 having a predetermined slope in a circumferential direction of an outer diametral surface and has a structure in which a rotational shaft 112 is vertically erected as an integrated or separate body at the center of an upper part thereof as illustrated in FIG. 2.

[0085] In addition, a coupling groove 122 may be formed at a lower part of a transfer bracket 120 to which one or more rolling wheels 110 are rotatably coupled as illustrated in FIG. 2 and a coupling hole 124 penetrating the upper and lower parts of the transfer bracket 120 as illustrated in FIG. 3.

[0086] Hereinafter, since a structure in which the coupling hole 124 is formed and a cover part 126 is coupled to the coupling hole 124 is the same as the structure in which the coupling groove 122 is formed in the transfer bracket 120, when an installation structure of a thrust member 150 is described for each embodiment, the installation structure is described based on the coupling groove 122 to substitute for description of the installation structure of the thrust member 150 and the radial member 140 in the transfer bracket 120 having the coupling hole 124 and the cover part 126 as components.

[0087] Moreover, in the case of the coupling groove 122 or the coupling hole 124 and the rotational shaft 112, the thrust member 150 is installed at the upper part of the rotational shaft 112 to support a thrust load (vertical load) and the radial member 140 is axially installed in the rotational shaft 112 positioned at the lower part of the thrust member 150 to support a radial load (a load which acts in a diameter direction of the rotational shaft 112).

[0088] Herein, the thrust member 150 is a normal structure in which a ball is rotatably coupled between an upper wheel 152 and a lower wheel 154 and under a condition in which the ball or roller serving to drive a bearing is installed to rotate in a horizontal direction while receiving the load in an axial direction with a diagonal or vertical contact surface between the upper and lower parts, if other bearings as well as a thrust bearing, an angular bearing, an automatic centering bearing, a taper bearing, an oilless bearing, and the like have a bearing structure which may be used under such a condition, all bearings may be substituted.

[0089] In the thrust member 150, the upper wheel 152 is closely disposed on the bottom of the coupling groove 122 or fixed and coupled onto the bottom of the coupling groove 122 as illustrated in FIG. 2.

[0090] Meanwhile, when the coupling hole 124 is formed in the transfer bracket 120, the cover part 126 serves to seal the upper part of the coupling hole 124 while the cover part 126 is coupled to the upper part of the transfer bracket 120 as illustrated in FIGS. 2 and 3 and in this case, the upper wheel 152 of the thrust member 150 installed in the coupling hole 124 may be closely disposed on the bottom of the cover part 126 or fixed and coupled onto the bottom of the cover part 126.

[0091] Herein, in the present disclosure, a means for coupling the upper wheel 152 of the thrust member 150 to the bottom of the coupling groove 122 or coupling the upper wheel 152 to the bottom of the cover part 126 is not limited.

[0092] That is, a means for coupling the upper wheel 152 through bolting, welding, riveting, forcible fitting by processing a groove, or the like is not limited in the present disclosure and the upper wheel 152 may be installed by adopting a coupling method used in the related art as much as you like according to a situation.

[0093] In addition, the lower wheel 154 positioned at the lower part of the upper wheel 152 of the thrust member 150 is installed at the upper part of the rotational shaft 112 to allow the vertical load transferred from the transfer bracket 120 to concentrate on the rotational shaft 112.

[0094] Herein, the present disclosure presents a structure in which the lower wheel 154 of the thrust member 150 is installed at the upper part of the rotational shaft 112 as multiple embodiments, and as a result, FIGS. 2 and 3 illustrate a first embodiment, FIG. 4 illustrates a second embodiment, FIG. 5 illustrates a third embodiment, FIG. 6 illustrates a fourth embodiment, and FIG. 7 illustrates a fifth embodiment.

[0095] Hereinafter, each embodiment in which the lower wheel 154 of the thrust member 150 is installed on the top of the rotational shaft 112 will be described with reference the accompanying drawings.

[0096] In the first embodiment, as illustrated in FIGS. 2 and 3, a horizontal step portion 116a and a vertical step portion 116b are formed on the top of the rotational shaft 112 and a rotation hole 154a of the lower wheel 154 of the thrust member 150 is inserted into the vertical step portion 116b formed on the top of the rotational shaft 112 to slip while maintaining a contact, and as a result, when the rotational shaft 112 is to be tilted, the rotational shaft 112 and the thrust member 150 slip to each other to minimize an influence of the force to be tilted on the thrust member 150.

[0097] On the other hand, the rotation hole 154a of the lower wheel 154 of the thrust member 150 may be coupled and fixed while being inserted into the vertical step portion 116b formed on the top of the rotational shaft 112.

[0098] In the second embodiment, as illustrated in FIG. 4, the top of the rotational shaft 112 is rounded to mold a round portion 112a and an inner diametral surface of the rotation hole 154a of the lower wheel 154 of the thrust member 150 is rounded so that the round portion 112a slips while maintaining the contact through engagement.

[0099] Accordingly, when the force to be tilted acts on the rotational shaft 112 by the reaction generated from the rolling wheel 110 by the radial load or thrust load, the round portion 112a slips at the rotation hole 154a to minimize an influence of the force to tilted to the rotational shaft 112 on the thrust member 150.

[0100] In the third embodiment, as illustrated in FIG. 5, the top of the rotational shaft 112 is processed to be tapered up toward a center point to form a tapered portion 118 and while the rotation hole 154a of the lower wheel 154 of the thrust member 150 is inserted into the tapered portion 118 to maintain the contact, the tapered portion 118 slips at the rotation hole 154a and when the force to be tilted to the rotational shaft 112 thus acts on by the reaction generated from the rolling wheel 110 by the radial load or thrust load, the tapered portion 118 slips at the rotation hole 154a to minimize the influence of the force to be tilted to the rotational shaft 112 on the thrust member 150 as described in the second embodiment.

[0101] Moreover, the lower wheel 154 of the thrust member 150 is axially installed at the tapered portion 118 as described above to fix and couple the lower wheel 154 to the rotational shaft 112.

[0102] Accordingly, when the force to be tilted to the rotational shaft 112 is applied by the reaction generated from the rolling wheel 110 by the radial load or thrust load, the tapered portion 118 formed as such has a predetermined slope and the small force to tilt the rotational shaft 112 is thus applied to the lower wheel 154 of the thrust member 150, and as a result, generation of the biased load may be minimized.

[0103] In the fourth embodiment, as illustrated in FIG. 6, after a first fixation groove 156 is formed at the center of the bottom of the lower wheel 154 of the thrust member 150 formed as a disk, the top of the rotational shaft 112 is inserted and coupled into the first fixation groove 156, and as a result, while the top of the rotational shaft 112 is inserted into the first fixation groove 156 to maintain the contact, the top of the rotational shaft 112 slips.

[0104] The rotational shaft 112 is tapered or rounded up toward the center point of the top and the first fixation groove 156 has a groove shape corresponding to the shape of the rotational shaft 112, and as a result, the top of the rotational shaft 112 is inserted and coupled into the first fixation groove 156.

[0105] Even in the fourth embodiment, when the force to be tilted to the rotational shaft 112 is applied by the reaction generated from the rolling wheel 110 as the top of the rotational shaft 112 is tapered or rounded as described in the second embodiment, a slip phenomenon minutely occurs when the force is applied onto of the top of the rotational shaft 112 which is tapered or rounded as described above, and as a result, even though the rotational shaft 112 is minutely tilted, the force is transferred to the lower wheel 154 of the thrust member 150 while the force is reduced or cancelled to minimize the generation of the biased load.

[0106] In the fifth embodiment, as illustrated in FIG. 7, a fixation shaft 158 is formed downward from the center of the bottom of the lower wheel 154 of the thrust member 150 formed as the disk and a second fixation groove 119 is formed on the top of the rotational shaft 112, and as a result, the fixation shaft 158 is inserted into the second fixation groove 119 and the fixation shaft 158 may thus slip while the fixation shaft 158 is inserted into the second fixation groove 119 to maintain the contact and the fixation shaft 158 is tapered or rounded downward and the second fixation groove 119 has the groove shape corresponding to the shape of the fixation shaft 158 to insert and fix the fixation shaft 158 into the second fixation groove 119.

[0107] Even in the fifth embodiment, when the force to be tilted to the rotational shaft 112 is applied by the reaction generated from the rolling wheel 110 as the second fixation groove 119 tapered or rounded on the top of the rotational shaft 112 and the fixation shaft 158 formed on the lower wheel 154 of the thrust member 150 are tapered or rounded as described in the fourth embodiment, the slip phenomenon minutely occurs in the fixation shaft 158 and the second fixation groove 119 which is tapered or rounded as described above, and as a result, even though the rotational shaft 112 is minutely tilted, the force is transferred to the lower wheel 154 of the thrust member 150 while the force is reduced or cancelled to minimize the generation of the biased load.

[0108] Meanwhile, the radial member 140 is coupled to the lower part of the coupling groove 122 of the transfer bracket 120 or the lower part of the coupling hole 124 and the lower part of the rotational shaft 112 and the radial member 140 may be positioned at the lower part of the thrust member 150.

[0109] The radial member 140 is a normal radial member in which the ball is rotatably coupled between an outer wheel 142 and an inner wheel 144 and under a condition in which a left side and a right side of the radial member 140 are installed to contact in an orthogonal direction or a diagonal direction to the shaft, since all other bearing structures which may be used under such a condition may be selectively adopted and installed as well as the radial bearing, the automatic centering bearing, the taper bearing, the oilless bearing, at least one pin casters or pin balls or needle bearing, the present disclosure is not limited thereto.

[0110] In the radial member 140, the outer wheel 142 is fixed and coupled onto the inner surface of the coupling groove 122 or the coupling hole 124 as illustrated in FIGS. 3 to 6, and as a result, in the present disclosure, a means for coupling the outer wheel 142 to the inner surface of the coupling groove 122 or the coupling hole 124 is not limited.

[0111] That is, a means for coupling the outer wheel 142 through bolting, welding, riveting, forcible fitting by processing a groove, inserting and installing multiple cylinders, fitting and coupling the outer wheel 142 between the cylinders, or the like is not limited in the present disclosure and the outer wheel 142 may be installed by adopting a coupling method used in the related art as much as you like according to a situation.

[0112] In addition, the inner wheel 144 positioned inside the outer wheel 142 is axially installed at the lower part of the rotational shaft 112, and as a result, when the rotational shaft 112 rotates, the inner wheel 1444 also rotates.

[0113] Herein, the radial member 140 installed in the coupling groove 122 or the coupling hole 124 is configured by combining at least one single or multiple types of an opening type, a single-surface shield type, a both-surface shield type, a single-surface sealing type, and a both-surface sealing type.

[0114] Accordingly, when the radial member 140 configured as the shield type or the sealing type is installed, the lower part of the coupling groove 122 or the coupling hole 124 is sealed to fundamentally prevent inflow of foreign materials or polluted materials in the coupling groove 122 or the coupling hole 124.

[0115] Further, as illustrated in FIGS. 2 and 3, in order to prevent the foreign materials or polluted materials from flowing in the coupling groove 122 or the coupling hole 124, a shield panel 160 in which a shield hole 162 penetrated by the rotational shaft 112 is formed is coupled to the lower part of the coupling groove 122 or the coupling hole 124 to prevent the inflow of the foreign materials or the polluted materials and a structure may be adopted, in which the shield panel 160 is coupled to the lower part of the coupling groove 122 or the coupling hole 124 while adopting the radial member 140 as the shield type or the sealing type.

[0116] An operation state of the roller according to the present disclosure, which has such a configuration, will be described below with reference to FIG. 3.

[0117] First, when the inclined surface of the rolling wheel 110 rolling-contacts the guide rail 130 as illustrated in FIGS. 2 to 7, a load of an object or equipment installed at the upper part of the transfer bracket 120 is transferred to the guide rail 130 through the transfer bracket 120 and the rotational shaft 112.

[0118] In this case, force which reacts to the load of the object or equipment at the upper part of the transfer bracket 120 is generated in the guide rail according to the action and reaction law (when object A applies the force to object B (action), object B also applies force having the same magnitude to object B (reaction)), and as a result, repulsive power acts in an opposite side to the guide rail 130 at a rolling-contact position.

[0119] As a result, since the force of the reaction generated as such acts in an upper right direction of the rolling wheel 110 in FIG. 2, the reaction force acts as force to tilt the rolling wheel 110 on the guide rail 130.

[0120] In the related art, the force by the reaction is solved by the radial bearing 40 on the top of the rotational shaft 112 as illustrated in FIG. 1B, but since a rotational angle for the force to be tilted increases as being distant from a point where the reaction is generated as illustrated in FIG. 1B, occurrence of a clearance depending on the assembly tolerance generated in a coupling structure with the radial bearing 40 and the rotational shaft 12 and a permission tolerance of the radial bearing 40 itself may not be prevented according to the force generated as the reaction in the related structure in which the radial bearing 40 is axially installed on the top of the rotational shaft 112 and further, since the rotational angle at the upper part of the rotational shaft 112 has a larger rotational angle to tilt the rotational shaft 112 than the lower part of the rotational shaft 112, the size of the clearance increases as large as the rotational angle, and as a result, the vertical load cannot but be biased to any one side by a minute tilting phenomenon of the rotational shaft 112.

[0121] However, the radial member 140 according to the present disclosure is axially installed on the bottom of the rotational shaft 112, and as a result, the radial member 140 is installed at a closer position to the point where the reaction occurs. Therefore, the rotational angle for the force to be tilted by the reaction decreases as large, and as a result, when the radial load depending on the force generated as the reaction is absorbed and dispersed, the radial load is absorbed and dispersed more easily than the case where the radial member 140 is installed on the top of the rotational shaft 112.

[0122] Consequently, in respect to the load for a total weight of the object or equipment installed at the upper part of the transfer bracket 120, if the radial member 140 eccentrically rotates when a load corresponding to a size of 10 acts in the related art, when the load for the total weight of the object or equipment installed at the upper part of the transfer bracket 120 has the size of 10, rotation without eccentricity is achieved while the radial load by the load is more easily absorbed and dispersed.

[0123] Meanwhile, in the present disclosure, the thrust member 150 is installed on the top of the rotational shaft 112 as illustrated in FIGS. 2 to 7.

[0124] Since the lower wheel 54 of the thrust bearing 50 is directly installed at the upper part of the inclined surface rolling wheel 10 as illustrated in FIG. 1B in the related art, when the inclined surface rolling wheel 10 is thrust to a lateral surface, since the force is biased to the left side of the thrust bearing 50 while a gap between the inclined surface rolling wheel 10 and the transfer bracket 20 at the left side is smaller than the gap between the inclined surface rolling wheel 10 and the transfer bracket 20 at the right side as illustrated in FIG. 1B, an oil film is broken, and the like.

[0125] However, in the present disclosure, even when the lateral thrusting of the rolling wheel 110 occurs, since the thrust member 150 is positioned at the upper part of the radial member 140, the radial load by the lateral thrusting is absorbed and dispersed by the radial member 140 to minimize an influence on lateral thrusting.

[0126] Moreover, the thrust load concentrates on the tops of the lower wheel 154 of the thrust member 150 and the rotational shaft 112 and in this case, since the lower wheel 154 of the thrust member 150 is axially installed on the rotational shaft 112 or is installed to slip, an influence by the lateral thrusting or tilting phenomenon of the rotational shaft 112 may be minimized.

[0127] In addition, in the roller in the related art, since the lower wheel 54 is wholly influenced even in the lateral thrusting within a tolerance range provided with respect to the force with which the thrust member 50 is thrust in the horizontal direction, the lower wheel 54 presses the ball as illustrated in FIG. 1C, but in the present disclosure, since the lower wheel 154 does not wholly have a fixed structure and the thrust load concentrates on the tops of the lower wheel 154 and the rotational shaft 112, the lower wheel 154 may secure rollability by flexibly coping with the lateral thrusting within the tolerance provided with the respect to the force with which the thrust member 150 is thrust in the horizontal direction.

[0128] Furthermore, since the radial load is absorbed and dispersed with smaller force than the related art on the bottom of the rotational shaft 112, the force to tilt the rotational shaft 112 also decreases and the rotational angle to tilt the rotational shaft 112 also decreases to prevent an overload from being generated in the thrust member 150 and since the vertical load acts not to be biased to any one side but wholly uniformly acts on the thrust member 150, the problems including the breakage of the oil film of the thrust member 150 by the biased load, and the like may be solved.

[0129] Consequently, since the radial load is absorbed and dispersed by the radial member 140 and the thrust member 150 is positioned out of an influence area of the lateral thrusting, eccentric rotation or partial abrasion by the lateral thrusting of the rolling wheel 110 like the thrust member 150 in the related art may be completely resolved.

[0130] Moreover, in the related art, since the thrust bearing 50 is positioned at the lower part of the radial bearing 40, if the force to tilt the inclined surface rolling wheel 10 is directly influenced by the thrust bearing 50 due to the reaction by the vertical load while the radial bearing 40 may not absorb and disperse the radial load, in the present disclosure, since the thrust member 150 is installed on the top of the rotational shaft 112 at a position spaced apart to the upper part from the rolling wheel 110, the problem in that the thrust member 150 is eccentric or partially abraded may be completely resolved.