Precision Sliding Bearing

Abstract

A sliding bearing (1) includes a bearing body (2) in the manner of a hollow cylinder produced from a base material, which body encloses a bushing (20). An antifriction material different from the base material is provided in the bushing (20) on the inside of the bearing body (2), which antifriction material encloses a sliding guide (4) lying within the bushing (20). The sliding bearing (1) includes at least one hollow-cylinder-like sliding element (3) made from the antifriction material, which element is arranged in the bushing (20) of the bearing body (2) and encloses the sliding guide (4) in a circumferentially closed manner. The sliding element (3) includes on its outside at least one projection (310), which engages a recess (21) provided on the inside of the bearing body (2). The sliding element (3) is pressed by a radial press fit into the bushing (20) of the bearing body (2).

Claims

1. A sliding bearing (1) comprising a bearing body (2) in the manner of a hollow cylinder produced from a base material and extending along a longitudinal axis, which body encloses a bushing (20) with its inside, wherein an antifriction material different from the base material is provided in the bushing (20) at the inside of the bearing body (2), which antifriction material encloses a sliding guide (4) lying within the bushing (20), wherein the sliding bearing (1) comprises at least one hollow-cylinder-like sliding element (3) made from the antifriction material, which element is arranged in the bushing (20) of the bearing body (2) and encloses the sliding guide (4) in a circumferentially closed manner and has a wall thickness of less than 1 mm, wherein the sliding element (3) has on its outside at least one projection (310), with which it engages in a recess (21) provided at the inside of the bearing body (2) to fix a relative position between the sliding element (3) and the bearing body (2), and wherein the sliding element (3) is pressed by a radial press fit into the bushing (20) of the bearing body (2), wherein the at least one projection (310) engages in the recess (21) on the inside of the bearing body (2) in such a way that the sliding element (3) is fixed in its position along the longitudinal axis relative to the bearing body (2) by a form fit with the bearing body (2).

2. The sliding bearing (1) according to claim 1, wherein the sliding element (3) comprises a jacket part (33), which is formed in the manner of a hollow cylinder, wherein the projection (310) of the sliding element (3) includes at least one spring section (31) provided on the jacket part (33), wherein the spring section (31) is spaced from each longitudinal end of the bushing (20) by at least 25% of a total length of the bushing (20) along the longitudinal axis.

3. The sliding bearing (1) according to claim 2, wherein the jacket part (33) comprises a longitudinal section within which it encloses the longitudinal axis in a circumferentially closed manner, wherein the jacket part (33) has the same clear cross-section within its entire longitudinal section, wherein this longitudinal section of the jacket part (33) extends over at least 50% of a total longitudinal extension of the sliding element (3) and/or is spaced by less than 10% of the total longitudinal extension of the sliding element (3) from an absolute longitudinal end of the bushing (20).

4. The sliding bearing (1) according to claim 2, wherein the spring section (31) is formed between two slots (32) running along the longitudinal axis and formed in a further longitudinal section of the jacket part (33).

5. The sliding bearing (1) according to claim 1, wherein the sliding element (3) includes multiple projections (310) on its outside, which are arranged distributed along a rotary direction about the longitudinal axis.

6. The sliding bearing (1) according to claim 1, wherein the bearing body (2) comprises within its bushing (20), at least one recess (21) running perpendicular to the longitudinal axis in which the projection (310) engages.

7. The sliding bearing (1) according to claim 1, wherein the sliding bearing (1) comprises two sliding element sections (3a, 3b), which are arranged adjacent to one another along the longitudinal axis and respectively in the bushing (20) and which each have on their outside at least one projection (310) with which they engage respectively in the recess (21) on the inside of the bearing body (2), wherein each of the sliding element sections is formed by a separate sliding element (3) respectively.

8. The sliding bearing (1) according to claim 1, wherein the bearing body (2) comprises on its outside circumferential assembly grooves (7) spaced from one another along the longitudinal axis.

9. The sliding bearing (1) according to claim 7, wherein the sliding element sections (3a, 3b) have the same axial length.

10. The sliding bearing (1) according to claim 1, wherein the sliding bearing (1) is formed as a round shaft sliding bearing.

11. The sliding bearing according to claim 1, wherein the sliding element (3) is made from a tribological polymer.

12. A sliding bearing arrangement comprising the sliding bearing (1) with at least one sliding element according to claim 1 as well as a cylindrical shaft, which is arranged in the sliding guide (4) of the sliding bearing (1) and extends through the bushing (20) and rests at the at least one sliding element (3) over at least 50% of its outer surface lying within the bushing (20) at the at least one sliding element (3).

13. A sliding bearing arrangement comprising the sliding bearing (1) with at least one sliding element according to claim 1 as well as a cylindrical shaft, which is arranged in the sliding guide (4) of the sliding bearing (1) and extends through the bushing (20) and rests at the at least one sliding element (3) over at least 70% of its outer surface lying within the bushing (20) at the at least one sliding element (3).

14. A sliding bearing arrangement comprising the sliding bearing (1) with at least one sliding element according to claim 1 as well as a cylindrical shaft, which is arranged in the sliding guide (4) of the sliding bearing (1) and extends through the bushing (20) and rests at the at least one sliding element (3) over at least 80% of its outer surface lying within the bushing (20) at the at least one sliding element (3).

15. The sliding bearing (1) according to claim 2, wherein the jacket part (33) comprises a longitudinal section within which it encloses the longitudinal axis in a circumferentially closed manner, wherein the jacket part (33) has the same clear cross-section within its entire longitudinal section, wherein this longitudinal section of the jacket part (33) extends over at least 50% of a total longitudinal extension of the sliding element (3) and/or is spaced by less than 5% of the total longitudinal extension of the sliding element (3) from an absolute longitudinal end of the bushing (20).

16. The sliding bearing (1) according to claim 1, wherein the bearing body (2) comprises within a central area of the bushing (20) with reference to the longitudinal axis at least one recess (21) running perpendicular to the longitudinal axis in which the projection (310) engages.

17. The sliding bearing (1) according to claim 1, wherein the sliding bearing (1) comprises two sliding element sections (3a, 3b), which are arranged adjacent to one another along the longitudinal axis and respectively in the bushing (20) and which each have on their outside at least one projection (310) with which they engage respectively in the same recess (21) on the inside of the bearing body (2), wherein each of the sliding element sections is formed by a separate sliding element (3) respectively.

Description

[0019] An exemplary embodiment of the invention is depicted in the drawing.

[0020] This shows:

[0021] FIG. 1: an embodiment of a sliding bearing according to the invention in longitudinal section in a schematic diagram;

[0022] FIG. 2: the bearing body of the sliding bearing according to FIG. 1 in longitudinal section in a schematic diagram;

[0023] FIG. 3a: various views of a sliding element of the sliding bearing according to FIG. 1 in various schematic diagrams.

[0024] In FIGS. 1 to 3, an exemplary embodiment of a sliding bearing 1 according to the invention is depicted in an explanatory manner. FIG. 1 shows here a longitudinal section of the overall sliding bearing 1, FIG. 2 shows a longitudinal section of the bearing body 2 and FIG. 3, comprising FIGS. 3a, 3b and 3c, shows various views of one of the two sliding elements 3 used in the sliding bearing 1, which elements are formed identically in the present exemplary embodiment. In the exemplary embodiment depicted in the figures, the bearing body 2 of the sliding bearing 1 is in the form of a sleeve, into the bushing 20 of which two sliding elements 3 are inserted, which each form one of two similar sliding element sections 3a, 3b, which are arranged behind one another in the bushing 20 of the bearing body 2 in the longitudinal direction of same in such a way that they form a unit located between the two end faces or longitudinal ends 5, 6 of the bearing body 2, the length of which unit can be equal to that of the bearing body 2. Here the longitudinal ends of the bearing body 2 are also the longitudinal ends of the bushing 20. The sliding element sections 3a, 3b cover the inner jacket surface of the bearing body 2 with the exception of those areas that are not, however, functionally relevant formed by slots or edge openings 32, which are arranged in each sliding element section 3a, 3b in its longitudinal end area, which lies opposite that of the respectively other sliding element section 3a, 3b. The slots 32 of each sliding element section 3a, 3b delimit a spring section 31, which can be deformed more strongly elastically and has at its free end a projection 310 that points outwards and can be formed in the manner of a flange.

[0025] The bearing body 2 is provided at its inner jacket surface with an advantageously circumferential recess 21, for example like a groove, which is arranged in the center of the longitudinal extension of the bearing body 2 without the latter being an absolute necessity.

[0026] In the assembled state of the sliding bearing 1, which can be gathered from FIG. 1 of the drawings, for instance, the projections 310 of the sliding element sections 3a, 3b, i.e. of the respective sliding element 3, engage in the recess 21 in the bearing body 2, a common groove-like recess 21 being provided in the specific case for the projections 310 of each sliding element section 3a, 3b. Two recesses 21 can also be present, however.

[0027] A positive-locking connection between the sliding element sections 3a, 3b of the sliding bearing 1 and the bearing body 2 can be produced easily in each case by the projections 310 engaging in the inner delimiting wall of the bearing body 2, which connection fixes a position of the sliding element sections 3a, 3b relative to the bearing body 2 along the longitudinal axis.

[0028] The assembly of the previously described sliding bearing 1 takes place simply in that a sliding element 3 forming respectively the respective sliding element section 3a and 3b is inserted from each face end 5, 6 of the bearing body 2 into the opening of the bushing 20. To achieve the radial press fit between bearing body 2 and sliding element 3 or its sliding element sections 3a, 3b, the hollow-cylinder-like sliding element 3 forming the respective sliding element section 3a, 3b can have an outer diameter that is slightly larger than the inner diameter of the bearing body 2, the end of the respective sliding element 3 provided with the slots 32 being somewhat compressed radially in order to be able to introduce the end-face edge area provided with the slots 32 into the respective opening of the bushing 20, this radial compression taking place to the extent that even the enlargement of the outer diameter of the respective sliding element section 3a, 3b caused by the projections 310 is compensated for.

[0029] The drawing indicates that a sliding bearing 1 of a greater length can be produced in the manner described above. By providing two separate sliding elements, which are inserted respectively from a longitudinal end 5, 6 of the bearing body 2 into the bushing 20, the assembly of the sliding bearing 1 remains easy despite the connection to be made here by means of a radial press fit.

[0030] The bearing body 2 of the sliding bearing 1 can be produced from different materials, e.g. from metals, depending on the conditions in each case. For the sliding element 3, a material suitable for this can be used, which can be a plastic, in particular a tribological polymer.

LIST OF REFERENCE CHARACTERS

[0031] 1 sliding bearing [0032] 2 bearing body [0033] 3 sliding element [0034] 3a, 3b sliding element section [0035] 4 sliding guide [0036] 5 end face [0037] 6 end face [0038] 7 assembly groove [0039] 8 arrow [0040] 20 bushing [0041] 21 recess [0042] 31 spring section [0043] 32 slot [0044] 33 jacket part [0045] 310 projection