HYDRAULIC BEARING BUSH

Abstract

A hydraulic bearing bushing (1) having:—an annular rubber body (3) that comprises an inner bushing (2) for receiving a bearing journal (12),—an outer annular housing (6) against the inner circumference of which the annular rubber body is supported, —at least two chambers (7, 8) that are formed between the annular rubber body and the annular housing or within the rubber body, are able to be filled with a hydraulic fluid and are connected together via at least one equalizing and throttle channel (9) such that, when the inner bushing is loaded by bearing forces, hydraulic fluid is exchangeable between the chambers. Reinforcing members (13, 14) having a greater modulus of elasticity in relation to the rubber material are arranged in or on the annular rubber body such that, when there is a pressure increase in one of the chambers, an expansion of the rubber body corresponding to an inflation or a change in shape is able to be reduced at least in one direction.

Claims

1.-10. (canceled)

11. A hydraulic bearing bushing comprising: an inner bushing for receiving a bearing journal; an annular rubber body that at least partially encloses the inner bushing radially on an outside and is vulcanized in enclosure regions; an outer housing against an inner circumference of the annular rubber body that is supported axially and radially on an outside; two chambers formed in a circumferential direction between the annular rubber body and the outer housing, each extend over partial regions of the circumference and are fillable with a hydraulic fluid; the two chambers are connected by an equalizing and throttle channel and configured to exchange the hydraulic fluid between the two chambers when the inner bushing is loaded by bearing forces; and reinforcing members having a greater modulus of elasticity than the annular rubber body, connected to the annular rubber body, and arranged so that an expansion of the rubber body corresponding to an inflation is reduced or prevented in a direction of travel on a pressure increase in the two chambers.

12. The hydraulic bearing bushing of claim 11, wherein the reinforcing members are connected to the annular rubber body by vulcanization.

13. The hydraulic bearing bushing of claim 11, wherein the reinforcement members are annular or helical.

14. The hydraulic bearing bushing of claim 11, wherein the reinforcing members are made of a metal material in the form of steel cords or steel rings, are arranged in or on the annular rubber body.

15. The hydraulic bearing bushing of claim 11, wherein the reinforcing members comprise a plastics material are arranged in or on the annular rubber body.

16. The hydraulic bearing bushing of claim 11, wherein the reinforcing members made of a fiber material and are arranged in or on the annular rubber body.

17. The hydraulic bearing bushing of claim 11, wherein the reinforcing members are in the form of a mesh or fabric provided in or on the annular rubber body.

18. The hydraulic bearing bushing of claim 11, further comprising two support rings vulcanized onto the two axially outer ends of the rubber body.

19. The hydraulic bearing bushing of claim 18, the support rings made of metal, wherein the rubber body is supported axially and radially against the inner circumference of the outer annular housing via the support rings.

20. The hydraulic bearing bushing of claim 19, wherein the reinforcing members in the form of metal rings are arranged at least partially within the rubber body.

21. The hydraulic bearing bushing of claim 11, the bushing formed as a wheelset guide bushing for a train chassis.

Description

[0027] The invention will be explained in more detail on the basis of an exemplary embodiment.

[0028] FIG. 1 schematically shows a hydraulic bearing bushing 1 for a rail vehicle running gear (not illustrated in more detail here). The hydraulic bearing bushing has an inner bushing 2 for receiving a pin or bearing journal 12, which serves for connecting to the bogie frame. The hydraulic bearing bushing also has an annular rubber body 3 that partially encloses the inner bushing 2 radially on the outside and axially on the outside and is connected thereto in these enclosure regions by vulcanization. The embodiment of the bearing bushing shown here also has two annular, metal support rings 4 and 5 vulcanized onto the two axial ends of the rubber body.

[0029] The hydraulic bearing bushing furthermore has an outer annular housing 6 against the inner circumference of which, specifically at the two axial ends of the housing, the support rings 4 and 5 are fixed by corresponding securing means/securing rings 15 and are sealed off toward the outside by sealing rings 16. The support rings 4 and 5 serve to reliably absorb particularly high axial loads and to transmit them from the bearing housing 6 to the inner bushing 2 via the rubber body 3. In the case of less high axial loads in other fields of application than in train running gears, designs without such support rings are quite conceivable, in which for instance all axial loads are transmitted by the vulcanization connection between the rubber body, housing and inner bushing.

[0030] FIG. 1 likewise shows that the hydraulic bearing bushing 1 has two chambers 7 and 8 that are formed in the circumferential direction between the annular rubber body 3 and the annular housing 6, each extend over partial regions of the circumference and are able to be filled with a hydraulic fluid, said chambers being connected together via equalizing and throttle channels 9. The direction of travel lies in this case in the plane of the drawing and the hydraulic chambers are deformed to a greater or lesser extent by radial forces, acting in the plane of the drawing, during operation of the bearing bushing, such that the hydraulic fluid located therein can flow into the respectively other chamber via the equalizing and throttle channel 9.

[0031] To simplify the production of the equalizing and throttle channels 9, the inner bushing 2 consists here of two hollow-cylindrical bodies inserted coaxially one in the other, specifically of a metal bushing 11 provided with an outer sleeve 10 made of steel. The equalizing and throttle channel 9 is in this case configured as a recess in the inner surface of the sleeve 10 and extends helically along a partial length of the inner bushing. The equalizing and throttle channel 9 is thus formed substantially in the connecting region or contact region of the steel sleeve 10 and metal bushing 11.

[0032] The inner bushing 2, or in this case the outer sleeve 10 of the inner bushing 2, to this end has, of course, corresponding inflow bores which connect the respective channel start to the corresponding chambers. The rubber body 3 also has corresponding inflows and bores that correspond to the inflow bores, of course.

[0033] The present configuration of the bearing bushing now consists in that reinforcing members 13, 14 in the form of steel rings are arranged partially within the rubber body 3 and have been vulcanized in. The steel rings, having a modulus of elasticity that is much higher relative to the rubber material, prevent, as a result of their arrangement on the inner circumference of the rubber body 3 and between the axial ends of the inner bushing 2 and the support rings 4, 5, any inflation of the rubber body 3 in the direction of the bearing middle in the event of a pressure rise in one of the chambers 7, 8. As a result of such high inflation stiffness, provided according to the invention, of the rubber body, the dynamic stiffness is then dependent substantially on the configuration of the connecting channel 9, i.e. on the diameter and length thereof. When traveling at high speed and in the case of a high frequency of the load, a high stiffness and hard mounting are required in order to ensure the travel safety.

[0034] A certain softness of the bearing bushing in the axial direction is retained, however, even in the present design with reinforcing members. In this regard, the conflict of objectives described at the beginning is solved to a satisfactory degree by the configuration according to the invention with reinforcing members. Low static stiffness in the vehicle longitudinal direction can be realized only with soft rubber and the latter by its nature does not have high inflation stiffness. For this purpose, the reinforcing members are then provided according to the invention.

[0035] For better understanding, FIG. 2 shows once, in a perspective diagram, an application or the use of a wheelset guide bushing in the rail vehicle running gear of a train chassis 17. The journal or pin 12 enclosed by the inner bushing or by the two hollow-cylindrical bodies inserted coaxially one in the other is connected to the bogie frame 18, while the outer housing 6—visible here only in the exploded illustration—is mounted in the primary yoke 19, in which the wheelset 20 is received.

LIST OF REFERENCE SIGNS

[0036] (Part of the description)

[0037] 1 Bearing bushing/wheelset guide bushing

[0038] 2 Inner bushing

[0039] 3 Annular rubber body

[0040] 4 Metal support ring

[0041] 5 Metal support ring

[0042] 6 Outer annular housing

[0043] 7 Hydraulic chamber

[0044] 8 Hydraulic chamber [0045] Equalizing and throttle channel between the hydraulic

[0046] 9 chambers

[0047] 10 Outer steel sleeve of the inner bushing

[0048] 11 Metal bushing (inner bushing)

[0049] 12 Bearing journal

[0050] 13 Vulcanized-in reinforcing member (steel ring)

[0051] 14 Vulcanized-in reinforcing member (steel ring)

[0052] 15 Securing ring/securing means

[0053] 16 Sealing ring

[0054] 17 Train chassis

[0055] 18 Bogie frame

[0056] 19 Primary yoke

[0057] 20 Wheelset