Bearing

Abstract

A bearing (91), more particularly a radial anti-friction bearing, including a bearing ring (61) with a lateral surface (63) formed by at least one undercut (65), and at least one sealing element (93) having an elastomer portion (103) and an elastic retaining lip (99), wherein the elastomer portion of the sealing element is received in the undercut at least in some portions, wherein the lateral surface of the undercut has a contour (67) with a contact portion (69) for axially securing the elastic retaining lip, as well as an axial contact surface (71), on which an axial contact surface (101) of the elastomer portion of the sealing element lies flat, is provided.

Claims

1. A bearing comprising: a bearing ring having a lateral surface formed by at least one recess, and at least one sealing element including an elastomer section and an elastic retaining lip, the elastomer section of the sealing element being accommodated in the recess, at least in sections, the lateral surface of the recess having a contour including a contact section for axially securing the elastic retaining lip, as well as an axial contact surface, on which an axial contact surface of the elastomer section of the sealing element planarly abuts on the axial contact surface; wherein the recess is additionally provided with a radial clearance; wherein a radial shoulder is additionally provided between the shoulder of the contact section and the radial clearance.

2. A bearing comprising: a bearing ring having a lateral surface formed by at least one recess, and at least one sealing element including an elastomer section and an elastic retaining lip, the elastomer section of the sealing element being accommodated in the recess, at least in sections, the lateral surface of the recess having a contour including a contact section for axially securing the elastic retaining lip, as well as an axial contact surface, on which an axial contact surface of the elastomer section of the sealing element planarly abuts on the axial contact surface; wherein the sealing element includes a sealing member having a reinforcement; wherein the reinforcement includes an annular base body of material thickness s as well as a reinforcing section oriented inwardly against the axial contact surface of the recess, radius of curvature R being in a range between 0.2 mm and 2.Math.s at the transition between the base body and the reinforcing section.

3. The bearing as recited in claim 2 wherein a thickness y of the elastic retaining lip of the sealing element is in a range between 0.15 mm and 1.2.Math.s.

4. The bearing as recited in claim 2 wherein a radial thickness d of the elastomer section of the sealing element is in a range between 1.5.Math.s and 4.5.Math.s.

5. The bearing as recited in claim 4 wherein the sealing member of the sealing element merges with the elastic retaining lip in a transitional area, axial thickness t in the transitional area being in a range between 0.5.Math.d and 1.Math.d.

6. The bearing as recited in claim 5 wherein the recess width Et of the recess is in a range between 0.8.Math.t and 1.2.Math.t.

7. A bearing comprising: a bearing ring having a lateral surface formed by at least one recess, and at least one sealing element including an elastomer section and an elastic retaining lip, the elastomer section of the sealing element being accommodated in the recess, at least in sections, the lateral surface of the recess having a contour including a contact section for axially securing the elastic retaining lip, as well as an axial contact surface, on which an axial contact surface of the elastomer section of the sealing element planarly abuts on the axial contact surface; wherein the recess is additionally provided with a radial clearance; wherein the bearing ring has an outer diameter D, and the radial distance a between the elastomer section of the sealing element and the base of the radial clearance is in a range between 0.03 mm and 0.004.Math.D.

8. A bearing comprising: a bearing ring having a lateral surface formed by at least one recess, and at least one sealing element including an elastomer section and an elastic retaining lip, the elastomer section of the sealing element being accommodated in the recess, at least in sections, the lateral surface of the recess having a contour including a contact section for axially securing the elastic retaining lip, as well as an axial contact surface, on which an axial contact surface of the elastomer section of the sealing element planarly abuts on the axial contact surface; wherein the contact section of the contour includes a shoulder overlapping the elastic retaining lip of the sealing element for the axial securing thereof, the elastic retaining lip having a thickness y; wherein the shoulder of the contact section of the contour is set back radially in the recess by a distance X, the distance X being in a range between 0.5.Math.y and 1.5.Math.y.

9. A bearing comprising: a bearing ring having a lateral surface formed by at least one recess, and at least one sealing element including an elastomer section and an elastic retaining lip, the elastomer section of the sealing element being accommodated in the recess, at least in sections, the lateral surface of the recess having a contour including a contact section for axially securing the elastic retaining lip, as well as an axial contact surface, on which an axial contact surface of the elastomer section of the sealing element planarly abuts on the axial contact surface; wherein the contact section of the contour includes a shoulder overlapping the elastic retaining lip of the sealing element for the axial securing thereof, the elastic retaining lip having a thickness y; wherein, in the relaxed state, the retaining lip extends radially by a distance C radially beyond the shoulder or beyond a control point of the contact section, the distance C being in a range between 0.02 mm and 2.Math.y.

10. A bearing comprising: a bearing ring having a lateral surface formed by at least one recess, and at least one sealing element including an elastomer section and an elastic retaining lip, the elastomer section of the sealing element being accommodated in the recess, at least in sections, the lateral surface of the recess having a contour including a contact section for axially securing the elastic retaining lip, as well as an axial contact surface, on which an axial contact surface of the elastomer section of the sealing element planarly abuts on the axial contact surface; the elastic retaining lip having a thickness y; wherein the elastomer section of the sealing element is set back in the recess by a radial distance b, the radial distance b being in a range between 0.03 mm and 1.25.Math.y.

11. The bearing as recited in claim 10 wherein the bearing is a machine tool spindle bearing.

12. The bearing as recited in claim 10 wherein the recess is introduced into an outer bearing ring.

13. The bearing as recited in claim 10 wherein the recess is introduced into an inner bearing ring.

14. A radial rolling bearing comprising the bearing as recited in claim 10.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The present invention is explained below on the basis of a drawing.

(2) FIG. 1 shows a cross-sectional view of a detail of the lateral surface of a bearing ring;

(3) FIG. 2 shows a cross-sectional view of a detail of the lateral surface of another bearing ring;

(4) FIG. 3 shows a cross-sectional view of a detail of the lateral surface of another bearing ring;

(5) FIG. 4 shows a cross-sectional view of a detail of the bearing ring according to FIG. 3, including a theoretically inserted sealing element;

(6) FIG. 5 shows a cross-sectional view of a detail of the bearing ring according to FIGS. 3 and 4, including the inserted sealing element according to FIG. 4; and

(7) FIG. 6 shows a cross-sectional view of a detail of another bearing, including a sealing element inserted into a bearing ring.

DETAILED DESCRIPTION

(8) FIG. 1 shows a cross-sectional view of a detail of a bearing ring 1 for accommodating a sealing element. Bearing ring 1 includes a lateral surface 3, which is formed by a recess 5. In the mounted state, a sealing element, or, in particular the elastomer section of a sealing element, may be positioned in this recess 5, at least in sections, and come into contact with lateral surface 3. In the present case, recess 5 is introduced into bearing ring 1 as a recess, with the aid of a recess turning process.

(9) To position a sealing element, lateral surface 3 of recess 5 is provided with a corresponding contour 7 for this purpose. Contour 7 includes a contact section 9 for axially securing an inserted sealing element, a control point 10 on contact section 9 as well as an axial contact surface 11, which prevents the sealing element from tilting.

(10) In the relaxed state, the retaining lip of a theoretically inserted sealing element extends radially beyond control point 10 of contact section 9 by a distance C.

(11) Contact section 9 of contour 7 is inclined in the radial direction, against the direction of installation, and merges directly with a radial clearance 13. Due to the incline of contact section 9, it is ensured that an inserted sealing element may be positioned axially on contact section 9 or on lateral surface 3 of recess 5 in a form-locked manner. Radial clearance 13, in turn, prevents a massive contact between the sealing element and contour 7 of recess 5. In this way, a gap is maintained between the sealing element or the elastomer section of the sealing element and contour 7, which compensates for tolerances, for example roundness errors, of both recess 5 and the sealing element.

(12) Axial contact surface 11, on the other hand, enables a sealing element to planarly abut with its axial contact surface in the installed state thereof, so that a tilting of the sealing element is prevented. A retraction of the sealing element against the direction of installation is also not possible due to the geometry of contour 7 of recess 5.

(13) On the whole, an axially nondetachable positioning of a sealing element on lateral surface 3 of bearing ring 1 is achieved by the combination of contact section 9 and axial contact surface 11.

(14) Bearing ring 1 is also provided with a raceway section 15. A circumferential, axial collar 19 is formed in transitional area 17 between axial contact surface [sic; section] 9 and raceway section 15. Collar 19 results in an elongation of rim surface 21, which extends away from bearing ring 1 in the axial direction. A secure guidance of a rolling bearing cage may thus be achieved by the elongation of rim surface 21, making optimum use of the available installation space.

(15) FIG. 2 shows a cross-sectional view of a detail of another bearing ring 31 for accommodating a sealing element. Bearing ring 31 includes a lateral surface 33, which is introduced into recess 35, with the aid of a recess turning process. In the installed state, a sealing element which includes an elastomer section may be positioned in this recess 35, at least in sections, and come into contact with lateral surface 33.

(16) Like lateral surface 3 according to FIG. 1, lateral surface 33 of recess 35 is provided with a corresponding contour 37, which includes a contact section 39 for axially securing an inserted sealing element, a control point 40 on contact section 39 as well as an axial contact surface 41. Axial contact surface 41 facilitates the planar contact of a sealing element accommodated in recess 35 with its axial contact surface, so that a tilting of the sealing element is prevented.

(17) Once again, in the relaxed state, the retaining lip of a theoretically inserted sealing element extends radially beyond control point 40 of contact section 39 by a distance C.

(18) Contact section 39 of recess 35 is inclined in the radial direction, whereby it is ensured that an inserted sealing element is held within recess 35, retraction-proof against the direction of installation. Contact section 39 merges with a radial clearance 43, the transition taking place via a radial contact surface 45, in contrast to FIG. 1. Radial clearance 43 facilitates a sufficiently great distance between an inserted sealing element and contour 37 of recess 35 of bearing ring 31, so that a hard contact between the sealing element and contour 37 is prevented.

(19) Bearing ring 31 is provided with a raceway section 47. Circumferential, axial collar 51, which is provided in transitional area 49 between axial contact surface 43 and raceway section 47, again results in an elongation of rim surface 53, which extends away from bearing ring 31 in the axial direction. Collar 51 facilitates a particularly secure guidance of a rolling bearing cage, making optimum use of the available installation space.

(20) FIG. 3 shows a cross-sectional view of a detail of another bearing ring 61. Bearing ring 61 includes a lateral surface 63, which is formed by a recess 65. In the mounted state, a sealing element may be positioned in this recess 65. The sealing element, or its elastomer section, then comes into contact with lateral surface 63, at least in sections. Recess 65 is introduced into bearing ring 61 as a recess, with the aid of a recess turning process.

(21) Lateral surface 63 is provided with a corresponding contour 67, which includes both a contact section 69 and an axial contact surface 71 for a sealing element. Axial contact surface 71 facilitates the planar contact of an inserted sealing element and prevents the tilting thereof.

(22) Contact section 69 is provided with a shoulder 73 for axially securing an inserted sealing element, in contrast to bearing rings 1, 31 according to FIGS. 1 and 2. Shoulder 73 may overlap an inserted sealing element or a part of the sealing element and is thus used to prevent a retraction against the direction of installation. The sealing element may thus engage with recess 65 during mounting when the sealing element, or an elastic retaining lip of the sealing element, has passed shoulder 73. In this way, an axially form-locked connection is established between the sealing element and bearing ring 61.

(23) In addition, contour 67 of recess 65 is provided with a radial shoulder 75, which is introduced into contour 67 in the form of a step. A radial clearance 77 is provided by this shoulder 75. Clearance 77 prevents the contact between an inserted sealing element and lateral surface 63 of bearing ring 61. The radial depth of clearance 77 is 0.1 mm in the present case.

(24) The bearing ring furthermore includes a raceway section 79. A circumferential, axial collar 83 is provided in transitional area 81 of bearing ring 61 between axial contact surface 71 and raceway section 79. Collar 83 results in an elongation of rim surface 85, which extends away from bearing ring 61 in the axial direction. A secure guidance of a rolling bearing cage may thus be achieved even in a small installation space.

(25) FIG. 4 shows a cross-sectional view of a detail of a bearing 91 designed as a spindle bearing, including bearing ring 61 according to FIG. 3 and a theoretically inserted sealing element 93. With regard to the description of bearing ring 61, reference is made at this point to the detailed description according to FIGS. 3 and 4.

(26) Sealing element 93 inserted into bearing ring 61 includes a sealing member 94 which has an elastomer component 95 and a reinforcement 97. Elastomer component 95 is injection-molded around reinforcement 97. The sealing element, or elastomer component 95 of sealing element 93, has a radially elastic retaining lip 99 for the axial securing thereof as well as an axial contact surface 101 on its elastomer section 103.

(27) In the fixedly inserted state of sealing element 93 into bearing ring 61, radially elastic retaining lip 99 may come into pretensioned contact with shoulder 73 of contact section 69. Axial contact surface 101 of sealing element 93 then abuts planarly on axial contact surface 71 of lateral surface 63 of bearing ring 61. In this way, sealing element 93 may be axially positioned in a form-locked manner in recess 65 of bearing ring 61. Moreover, undesirable changes to the size and shape tolerances are not to be feared either in sealing element 93 or on recess 65 or on contour 67 of bearing ring 61.

(28) FIG. 5 shows the fixed installation of sealing element 93 in bearing ring 61. Axial contact surface 101 of sealing element 93 then abuts planarly on axial contact surface 71 of lateral surface 63 of bearing ring 61. Radially elastic retaining lip 99, in turn, is in pretensioned contact with shoulder 73 of contact section 69, so that the radial guidance of sealing element 93 takes place via the radially elastic part of retaining lip 99. Shoulder 73 overlaps retaining lip 99 and may thus prevent a shifting of sealing element 93 against the direction of installation.

(29) Radial clearance 77 formed by shoulder 75 prevents a widening of bearing ring 61 due to the avoidance of a massive contact between elastomer section 103 of sealing element 93 and lateral surface 63 or contour 67 of bearing ring 61.

(30) On the whole, bearing 91 may thus ensure the axial securing of sealing element 93 on bearing ring 61 independently of the radial and axial manufacturing tolerances of the particular sealing components.

(31) Sealing element 93 additionally has a sealing lip 105, which, in the installed state, is in rubbing contact with the outer circumference of the second bearing ring of rolling bearing 91 or has a gap to the outer circumference of the second bearing ring, for the purpose of sealing the bearing interior. The second bearing ring is not shown in the present case.

(32) FIG. 6 shows bearing 91 according to FIGS. 4 and 5, including sealing element 93, which is theoretically inserted into bearing ring 61. In the present case, axially circumferential collar 83 is clearly apparent, which is situated in transitional area 81 between axial contact surface 71 of contour 67 of bearing ring 61 and raceway section 79 and is used to elongate rim surface 85. Rim surface 85 facilitates a particularly secure guidance of rolling bearing cage 107 and rolling elements 109 guided therein, making optimum use of the available installation space.

(33) For the further description of bearing 91, reference is made at this point to the detailed description in FIGS. 3 through 5.

(34) In FIG. 6, reference is made to the dimensioning parameters of sealing element 93 and bearing ring 61, or contour 67 of recess 65 of bearing ring 61. To ensure the retaining function by positioning sealing element 93 on bearing ring 61, and for the purpose of the desired decoupling of corresponding shape and size tolerances, the dimensions of sealing element 93 and bearing ring 61 are advantageously coordinated with respect to each other.

(35) Reinforcement 97 of sealing element 93 includes an essentially annular base body 111 of material thickness s as well as a reinforcing section 113 oriented inwardly against axial contact surface 71 of recess 65. Radius of curvature R at transition 115 between base body 111 and reinforcing section 113 may be in a range between 0.2 mm and 2.Math.s. In the present case, radius of curvature R has a value of 0.5 mm.

(36) Thickness y of elastic retaining lip 99 of sealing element 93 may assume values between 0.15 mm and 1.2.Math.s and has a value of 0.3 mm according to FIG. 6. Radial thickness d of elastomer section 103 of sealing element 93, which may be, in particular, in a range between 1.5.Math.s and 4.5.Math.s, has a value of 2.5.Math.s in the present case.

(37) Sealing member 94 of sealing element 93 merges with elastic retaining lip 99 in a transitional area 117. In this transitional area 117, axial thickness t may be in a preferred range between 0.5.Math.d and 1.Math.d. In the present case, axial thickness t has a value of 0.7.Math.d.

(38) Recess width Et of recess 65 may assume values which are in a range between 0.8.Math.t and 1.2.Math.t. In the present case, recess width Et, which has a value of 1.Math.t, corresponds to thickness t in transitional area 117, in which sealing member 94 merges with retaining lip 99.

(39) Radial distance a between elastomer section 103 of sealing element 93 and the base of radial clearance 77, i.e., the radially lowest point, is dependent on outer diameter D of bearing ring 61. Radial distance a may advantageously be in a range between 0.03 mm and 0.004.Math.D, it having a value of 0.13 mm in the present case.

(40) Shoulder 73 of contact section 69 of contour 67 is set back radially in recess 65 by a distance X, distance X being able to be, in particular, in a range between 0.5.Math.y and 1.5.Math.y. According to FIG. 6, distance X has a value of 1.Math.y. In the present case, distance X thus has the value of thickness y of elastic retaining lip 99.

(41) In the relaxed state, retaining lip 99 extends radially beyond shoulder 73 of contact section 69 by a distance C. Distance C is advantageously in a range between 0.02 mm and 2.Math.y and, in the present case, has a value of 0.7.Math.y.

(42) Elastomer section 103 of sealing element 93 is set back in recess 65 by a radial distance b, radial distance b preferably being in a range between 0.03 mm and 1.25.Math.y. According to the present embodiment, distance b has a value of 0.6.Math.y.

LIST OF REFERENCE NUMERALS

(43) 1 bearing ring 3 lateral surface 5 recess 7 contour 9 contact section 10 control point 11 axial contact surface 13 clearance 15 raceway section 17 transitional area 19 collar 21 rim surface 31 bearing ring 33 lateral surface 35 recess 37 contour 39 contact section 40 control point 41 axial contact surface 43 clearance 45 radial contact surface 47 raceway section 49 transitional area 51 collar 53 rim surface 61 bearing ring 63 lateral surface 65 recess 67 contour 69 contact section 71 axial contact surface 73 shoulder 75 radial shoulder 77 clearance 79 raceway section 81 transitional area 83 collar 85 rim surface 91 bearing 96 sealing element 94 sealing member 95 elastomer component 97 reinforcement 99 retaining lip 101 axial contact surface 103 elastomer section 105 sealing lip 107 rolling bearing cage 109 rolling element 111 base body 113 reinforcing section 115 transition 117 transitional area