EP3589855A1

EP3589855A1 - Bearing bush

Info

Publication number: EP3589855A1
Application number: EP18727742.1A
Authority: EP
Inventors: Bartolomeo Firszt; Oliver Helmke; Ulrich Fuhrmans; Michael Mess; Rodscha Drabon; Peter Koczar; Dirk Rochell; Lars Sievers
Original assignee: Benteler Automobiltechnik GmbH; Vibracoustic SE
Current assignee: Benteler Automobiltechnik GmbH; Vibracoustic SE
Priority date: 2017-05-29
Filing date: 2018-05-18
Publication date: 2020-01-08
Also published as: CN110709612A; DE102017111668B4; WO2018219697A1; DE102017111668A1; US20200124088A1

Abstract

The invention relates to a bearing bush (10), comprising: a core (11); an intermediate sleeve (12) which surrounds the core (11) in a manner extending in a circumferential direction; an outer sleeve (16) which surrounds the intermediate sleeve (12) in a manner extending in a circumferential direction; an elastomer element (13) which is arranged between the intermediate sleeve (12) and the outer sleeve (16); and a stop device (17) which, at axial ends of the core (11), protrudes from the core (11) in a radial direction and limits movement of the intermediate sleeve (12) in an axial direction. The intermediate sleeve (12) is mounted on the core (11) rotatably relative to the stop device (17) in the circumferential direction. The outer sleeve (16) has a plurality of projections (21). The intermediate sleeve (12) has at least one counter-projection (22) which overlaps in the radial direction with the projections (21) in order to limit the axial deflection of the outer sleeve (16) relative to the core (11).

Description

bearing bush

The invention relates to a bearing bush with a core, with an intermediate sleeve surrounding the core extending in a circumferential direction, with an outer sleeve surrounding the intermediate sleeve extending in a circumferential direction and with an elastomeric body which is arranged between the intermediate sleeve and the outer sleeve. The stopper protrudes at axial ends of the core from the core in a radial direction and limits movement of the intermediate sleeve in an axial direction. The intermediate sleeve is rotatably mounted on the core and opposite the stop device in the circumferential direction.

Bushings are used for suspension components and may be formed as a plain bearing bush, in which the outer sleeve can rotate relative to the core. In order to prevent the outer sleeve from coming off axially from the core, a stop element may be provided at the axial end of the core so that the axial mobility of the outer sleeve relative to the core is limited. Plain bearings are known for example from DE 10 2004 031 302 B4 and DE

10 2004 024 269 A1 known. In addition, bearing bushes are also known from DE 10 2009 053 592 A1 and JP HO 798 034 A.

The object of the invention is to provide a bushing whose longevity is improved compared to the bearing bushes of the prior art.

The object is solved by the subject matter of claim 1. The dependent claims describe a preferred embodiment of the subject matter of claim 1. A bushing includes a core, an intermediate sleeve, an outer sleeve, an elastomeric body, and a stopper. The intermediate sleeve surrounds the core extending in a circumferential direction. The outer sleeve surrounds the intermediate sleeve extending in a circumferential direction. The elastomeric body is disposed between the intermediate sleeve and the outer sleeve. The stopper protrudes at axial ends of the core from the core in a radial direction and limits movement of the intermediate sleeve in an axial direction. The intermediate sleeve is rotatably mounted on the core and opposite the stop device in the circumferential direction. The outer sleeve has a plurality of projections. The intermediate sleeve has at least one counter-projection, which overlaps in the radial direction with the projections for limiting the axial deflection of the outer sleeve relative to the core. The elastomeric body has a projecting portion which projects beyond the intermediate sleeve in the axial direction and bears sealingly against the stopper device.

The bearing bush is in particular a rubber bearing with high axial rigidity, which may be formed as a torsional sliding bearing due to high torsional loads. The occurring axial forces are preferably derived axially via the intermediate sleeve. Since the intermediate sleeve is arranged displaceably on the core (= sliding function), another force flow is used: here as an axial sliding bearing. In such a sliding bearing no dirt should occur, especially not if the slide bearing is lubricated. For this purpose, the projecting area is arranged at the bearing bush.

Advantage of the invention is that the provision of the protruding portion, the storage of the intermediate sleeve on the core and the stop means is sealed by the projecting portion in a particularly simple manner. In particular, in comparison with the prior art, it is not necessary to provide a separate seal by means of which the bearing of the intermediate sleeve on the core and the stop device is sealed off.

According to the invention, the elastomeric body is extended by the projecting region, so that the projecting region can be made of the same material as the elastomeric body. Thus, it is not necessary in a separate Process step to produce the seal and attach the seal on the bearing bush in a further separate process step. Rather, it is possible in the bushing described here to produce the preparation and attachment of the seal in a process step, this merely a process step is not an additional process step, since the elastomeric body and thus the projecting area is provided in each case.

Due to the uniform structure of the protruding area with the elastomeric body also possible in comparison to conventional seals possible leak is avoided because between the protruding area and the

Elastomer body, where in conventional seals leakage could occur due to the uniform structure of the protruding area with the elastomer body no leak can be present.

In summary, by providing the protruding area, on the one hand, the production of a seal can be significantly simplified, since there is no need for producing an additional seal and that an improved sealing effect can be achieved.

The bushing may preferably be used as a leaf spring eye stock, for example in light-weight pickups or as a handlebar bearing in multi-link and torsion beam axes. In particular, it is possible with the bearing bush to allow large torsion angle by means of the integrated possibility of rotation in the circumferential direction of the outer sleeve relative to the core. At the same time good insulation properties can be provided, as known from known rubber bearings.

By providing the projections and the counter-projection, a high axial rigidity of the bearing bush in combination with the rotatable mounting of the outer sleeve to the core can be achieved.

The core and the outer sleeve preferably form the parts of the bearing bush by means of which the bearing bush is fastened to the vehicle. In particular, the core has a bore extending in the axial direction, by means of which the core and thus the bearing bush, for example, on a bolt can be attached. The outer sleeve can be received in the bearing eye, for example. The core may be formed in one piece or in two pieces, wherein a two-piece core is divided in relation to the one-piece core with respect to the axial direction.

The intermediate sleeve surrounds the core extending in a circumferential direction, it being noted that the intermediate sleeve need not completely surround the core extending circumferentially, such that the intermediate sleeve has a slot extending in the axial direction, for example. Further, the intermediate sleeve may be constructed of a plurality of parts, each extending in the Umfangsnchtung and spaced in the Umfangsnchtung. For example, the individual parts of the intermediate sleeve are arranged distributed uniformly along the Umfangsnchtung.

The Umfangsnchtung forms a cylindrical coordinate system with the axial direction and the radial direction, wherein the base vectors of the circumferential direction of the radial direction and the axial direction are perpendicular to each other. The axial direction coincides in particular with a rotational axis of the bearing bush.

The outer sleeve also surrounds the intermediate sleeve extending in the circumferential direction. Again, it applies again that the outer sleeve, the intermediate sleeve does not have to extend completely in the circumferential direction, but may have one or more slots which extend in the axial direction. Further, it is possible to design the outer sleeve in several parts, wherein each part is formed extending in the circumferential direction. The outer sleeve surrounds the intermediate sleeve and the core.

The intermediate sleeve may be made of plastic. The core, the stopper and / or the outer sleeve may be made of plastic, metal or an alloy.

The elastomeric body is disposed between the intermediate sleeve and the outer sleeve and serves to isolate vibrations induced in the radial direction as well as to provide the elastic properties of the bearing. The elastomer body can be designed as known from the prior art. Optionally, the elastomeric body is cohesively connected to the intermediate body, in particular vulcanized to the intermediate body. It is additionally or alternatively possible that the elastomeric body is also connected positively and / or cohesively with the outer sleeve.

The stopper is provided at axial ends of the core and protrudes in the radial direction from the core. The stop means may for example be formed by one or more flanges, which are connected to the core material, force or form-fitting at the axial end. For example, an annular disk can be pressed onto the core during production of the bearing bushing, which limits a movement of the intermediate sleeve in the axial direction on both sides. In this case, the stop device is formed by two annular discs. The annular discs are optionally made of a material that differs from the material of the core, the outer sleeve and / or the intermediate sleeve. For example, the annular discs are made of plastic, while the other components of the bearing bush are made of metal.

Due to the combination of rotary slide bearing and axial rigidity, the stop device, in particular in the form of lateral annular discs, necessary, which must be sealed accordingly, since a sliding function is also integrated here.

It is also optionally possible that the stop means are formed by one or more of the core in the radial direction projecting stops, wherein the stop or the material are formed uniformly with the core. For example, the stops may be formed in the form of the annular disc or as circumferentially axially projecting elements.

It is also possible, on the one axial side of the bearing bush to provide an annular disc which can be pressed onto the core and, on the other side, a stop which is constructed of the same material as the bearing core. In the case where the stops on both axial sides of the bearing bush are formed uniformly with the core, the core is in particular formed in two pieces, so that the two parts of the core can be inserted in the axial direction in the intermediate sleeve.

In order to provide the sliding bearing properties of the bearing bush, the intermediate sleeve is rotatably mounted relative to the core and the stop device. For this purpose, for example, a first gap between the intermediate sleeve and / or the stop device on the one hand and the intermediate sleeve and the core may be provided on the other hand, which is optionally filled with a lubricant. However, it is also possible that between the intermediate sleeve on the one hand and the core and / or the stop means on the other hand an element is provided which allows the rotatable mounting of the intermediate sleeve on the core. This can be realized for example by a thin elastomer layer.

The projections project from the outer sleeve, preferably radially inwards. The projections are in particular arranged substantially perpendicular to the axial direction of the bearing bush. The projections may be rectangular in cross-section, that is viewed in the circumferential direction, formed with angular and / or round edges. In particular, two projections may form a groove, in which engages the counter-projection. The elastomeric body preferably extends along the projections.

The counter-projections of the intermediate sleeve preferably extend in the radial direction outwards, that is, toward the outer sleeve. Again, the counter-projection may be arranged substantially perpendicular to the axial direction. Also, optionally, the counter-projection in cross-section, that is seen along the circumferential direction, rectangular in shape, with rounded or angular edges. The elastomeric body also optionally extends along the counter-protrusions.

It is optionally provided that the projections and / or the counter-projection extend substantially perpendicular to the axial direction of the bearing bush. In particular, axial side surfaces of the projections and / or the counter-projection extend substantially perpendicular to the axial direction, that is, substantially parallel to the radial direction. Essentially means that a deviation of up to ± 25 °, in particular up to ± 15 °, is possible. The extension of the axial side surface of the projection and the counter-projection perpendicular to the axial direction allows a particularly high axial rigidity. In particular, the axial side surface of the projection is arranged parallel to the axial side surface of the adjacent counter projection. Between these axial side surfaces of the region of the elastomeric body is arranged, which contributes to the axial stiffness and is compressed in a preferred embodiment.

Optionally, three or more protrusions and / or two or more counter protrusions may be provided. In particular, a plurality of projections and Gegenvor- jumps are provided, so that the outer sleeve is toothed with the intermediate sleeve. This toothing increases the axial stiffness of the bearing bush. The elastomeric body preferably extends between the projection and the counter-projection such that the elastomeric body also acts in an axial direction. It can be provided that the elastomeric body is made thinner on flanks of the projections, that is to say on axial side surfaces of the projections where the elastomeric body acts in the axial direction, than in regions at the bottom of the groove formed by two counterprojections, where the elastomeric body is in the radial direction Direction works. It can also be provided that the elastomeric body has a constant thickness.

The protruding region is preferably formed uniformly in material with the elastomeric body. This means that the elastomeric body and the protruding region can be produced in one process step, for example in the same vulcanization process step. The protruding portion acts as a seal to seal, for example, the first gap. The protruding region lies sealingly against the stop device in such a way that the intermediate sleeve can move relative to the stop device and the core. The projecting region preferably seals off the first gap between the intermediate sleeve and the stop device, in that the projecting region rests against the stop device and, due to the connection with the elastomeric body, also bears against the intermediate sleeve. Alternatively, the elastomeric body is vulcanized to the outer sleeve. The protruding area can be at or be provided at both axial ends of the bearing bush. Preferably, the projecting portion extends completely in the circumferential direction.

It is preferable that the protruding portion abuts on a peripheral side of the stopper.

The peripheral side of the stopper is the side of the stopper which faces the viewer when looking along the radial direction. The peripheral side thus extends in the circumferential direction. The peripheral side optionally has a circular course in the axial direction. In particular, the peripheral side is the side of the stopper which has a smaller area compared to the axial side surfaces of the stopper. In this way, the area between the projecting portion and the stopper can be reduced, resulting in particular in low friction between the projecting portion and the stopper when the core is rotated relative to the outer sleeve.

It is preferred that the intermediate sleeve has at axial ends in each case a limiting projection which projects in the radial direction from the intermediate sleeve.

The limiting projection can be regarded as a special embodiment of the counter-projection. With the aid of the limiting projection, the abutment surface between the intermediate sleeve and the stop device is increased in the axial direction in order to provide a better force transmission for limiting the intermediate sleeve in the axial direction. In particular, the limiting projection on the stop device facing side is executed parallel to the stop device. For example, the limiting projection and the stopper extend on the mutually facing sides parallel to the radial direction.

The abutment of the protruding area on the peripheral side of the stop device also has the advantage that, in the case of an axial deflection of the outer sleeve and thus also of the intermediate sleeve relative to the core, the projecting portion protrudes. rich no compression, whereby the life of the protruding area and thus the sealing effect can be extended.

It is preferred that the projecting region is arranged between the stop device and the intermediate sleeve, in particular between the stop device and the limiting projection.

This embodiment may be used in addition to or as an alternative to the above-described embodiment in which the protruding portion abuts against the peripheral side of the stopper. For example, in this embodiment, a part or all of the protruding region extends in the first gap between the stopper and the intermediate sleeve, in particular the limiting projection.

It can be provided that the projecting region is arranged only at one axial end or at both axial ends between the stop device and the intermediate sleeve. By the arrangement of the projecting portion between the stopper and the intermediate sleeve while the surface which is claimed by the friction of the outer sleeve against the core, and thus reduces the contact pressure, however, can in this way an effective alternative or complementary sealing system be generated.

It is preferred that the intermediate sleeve on an axial side, which faces the stop device, and / or the stop means on an axial side, which faces the intermediate sleeve, have a recess, in which optionally the projecting portion is arranged.

The recess may be provided both on the intermediate sleeve and on the stop device, or on one of the two parts. In particular, the recess is arranged on the intermediate sleeve.

In order to increase the strength of the projecting portion and thus achieve a lasting sealing effect, it is advantageous to form the projecting portion with a certain thickness. The intermediate between the intermediate sleeve and the However, the first gap provided by the beating device may have a thickness which is less than the thickness required for the projecting region. Therefore, the return can be provided on the intermediate sleeve and / or on the stop device, in which the projecting portion is arranged. In particular, the length and depth of the recess is adapted to the dimensions of the projecting area.

It is preferred that the protruding region has at least one first sealing lip which bears against the stop device.

It can be provided one or more first sealing lips. The first sealing lip may rest on the peripheral side of the stop device or on the axial side of the intermediate sleeve and / or the stop device. The sealing lip serves, in particular, to reduce the contact surface of the projecting region with the stop device, which improves both the sealing properties and the longevity in the case of a torsion of the outer sleeve relative to the core. The sealing lip is preferably formed uniformly in substance with the protruding region, but can also be configured as a separate element that is connected to the projecting region, but separate.

It is preferred that a surface between the intermediate sleeve and the core and / or between the intermediate sleeve and the stop means is provided with a lubricant for optimizing the sliding properties.

Between the intermediate sleeve and the core, a first gap is preferably provided during assembly, wherein preferably the first gap is filled with the lubricant. When installing the bearing bush, for example, in the receiving eye, but this first gap is closed so far that between the core and intermediate sleeve a play-free sliding bearing is generated.

The provision of the first gap serves to produce the rotatable mounting of the intermediate sleeve on the core and / or for the rotatable mounting of the intermediate sleeve relative to the stop device. The intermediate sleeve can thus slide on the core and / or the stop device. In order to improve the sliding properties and the wear on the intermediate sleeve, the core and / or the To reduce beating device, the lubricant is provided. As a lubricant, for example, fats or oils can be used. By providing the projecting area, on the one hand, the penetration of dirt into the first gap is prevented and, on the other hand, the leakage of the lubricant from the first gap is prevented. Therefore, the longevity of the bushing is improved due to the provision of the protruding portion.

It is preferred that the core and / or the intermediate sleeve have at least one recess for receiving the lubricant, in particular in the form of a lubricant groove extending in the axial direction.

The recess for receiving the lubricant serves in particular as a depot for the lubricant. By providing the recess, the volume for receiving the lubricant can be increased, so that more lubricant for sliding bearing of the intermediate sleeve is present on the core. The recess may also be provided as a pocket, that is, a limited space in the circumferential direction and axial direction space, in the intermediate sleeve and / or the core. However, it is preferred that the recess is formed as a lubricant groove, which extends along the axial direction, in particular along the entire length of the intermediate sleeve in the axial direction.

It is preferred that the recess is arranged on an axial outer side of the intermediate sleeve, which faces the stop device.

On the axial outer side of the intermediate sleeve, in particular of the limiting projection, in addition to the lubricant groove may further be provided a pocket for receiving lubricant. Extending the lubricant groove to the axial outer side of the intermediate sleeve, in particular of the limiting projection, and / or providing a separate lubricant groove in the radial direction on the axial outer side, and / or providing a pocket on the axial outer side, serves to also the sliding bearing of Intermediate sleeve to improve the stop device by also on the axial outside of a lubricant reservoir is provided to improve the sliding bearing between intermediate sleeve and stopper. The lubricant groove thus extends in the radial direction. It is preferred that the Elastomerkorper is vulcanized to the outer sleeve.

In this case, the projecting region can also rest on an axial outer side of the outer sleeve. An axial outside of the outer sleeve is the side which, if no projecting portion is provided, is visible when a viewer looks along the axial direction on the bearing bush. By the abutment of the projecting portion on the axial outside can prevent dirt from entering between the elastomeric body and the outer sleeve. In particular, the projecting portion is firmly applied to the axial outside of the outer sleeve when the elastomeric body is firmly connected to the outer sleeve. For example, the protruding region can be vulcanized on the axial outer side. Alternatively, the projecting portion may be slidably abutted on the axial outside.

It is preferred that the elastomeric body is partially spaced from the outer sleeve and / or from the intermediate sleeve by a second gap.

The second gap extends at least partially along the outer sleeve and / or the core device in the axial direction. Preferably, a plurality of second gaps are provided, which are provided spaced apart, for example, in the axial direction. The second gap can also be considered as a free space. In particular, the second gap is filled with a gas, for example air. The second gap optionally extends completely in the circumferential direction, wherein it is also possible for the second gap to be interrupted in the circumferential direction, for example by the elastomeric body.

In particular, when the elastomeric body is connected to the intermediate sleeve, the second gap between the elastomeric body and the outer sleeve is provided, whereas the second gap is preferably provided between the intermediate sleeve and the elastomeric body, when the elastomeric body is connected to the outer sleeve. The provision of the second gap influences the damping properties in the bearing bush in the case of radial vibrations. For small vibrations, the elastomeric body, at least in the region in which the second gap is provided, is not compressed, so that the elastomeric body when vibrations in the radial direction acts only in the areas in which no second gap is provided. In this way, in vibrations which are smaller than the thickness of the second gap, not the entire elastomeric body is compressed, but only parts of the elastomeric body. Thus, with vibrations that are smaller than the thickness of the second gap in the radial direction, a lower stiffness results in the radial direction than in larger vibrations, in which also the elastomeric body is compressed in the radial direction adjacent to the second gap.

It is preferred that the elastomeric body has a second sealing lip which seals the second gap.

Preferably, the outer sleeve has an axial first end portion and an axial second end portion, wherein the first end portion and / or the second end portion is spaced from the elastomeric body by the second gap. In particular, this is realized in that the projections of the outer sleeve are spaced from the axial ends of the outer sleeve, so that the outer sleeve is not limited in the axial direction by the projections, but has the first and second end region.

Between the first and second end region on the one hand and the elastomer body on the other hand, the second gap is provided, which is closed either by the abutment of the projecting portion on the axial outer side of the outer sleeve and / or by the provision of the second sealing lip. In particular, the second sealing lip is in the radial direction to the outside and preferably extends completely along the circumferential direction.

The provision of the first axial end portion and the second axial end portion is preferably useful when at least two of the projections in the radial direction with the limiting projections for limiting the axial deflection of the outer sleeve over the core overlap. In this way, the limiting projection can engage in the space defined by the first and / or second axial end portion and the projections. Of the second gap interacts with the respective limiting projection at the first and / or second axial end region.

It is preferred that the second gap is arranged between two protrusions and / or between two counter protrusions.

In this way, it is possible for the second gap to interact with the respective counter projection, which engages between the two projections, and / or with the projection, which engages between the two counterpart projections.

It is preferred that the elastomeric body has an additional cushion which extends into the second gap.

Optionally, the additional cushion has a convex outer contour. The convexly curved outer contour extends into the second gap. The cross section can be seen in particular along a plane extending in the axial direction. In such an embodiment of the additional cushion increases with the radial deflection of the outer sleeve relative to the intermediate sleeve, the effective area of the elastomeric body, which is compressed. In this way, progressively increases the rigidity of the bearing bush in the radial direction.

The additional cushion can extend completely along the circumferential direction into the second gap or be arranged in sections in the circumferential direction. The additional cushion is optionally assigned to every second gap. In an axial cross-section, that is seen in the circumferential direction, the additional cushion has an area which is smaller than the second gap, if no additional cushion is provided. This means that in comparison to the provision of a second gap more volume of the elastomeric body in the radial direction is effective and compared to the omission of the second gap less volume of the

Elastomer body in the radial direction is effective.

The additional cushion is preferably on the outer sleeve or on the intermediate sleeve. In this embodiment, there is a stiffness in the radial direction, which is lower than if no second gap is provided, but the larger He is as if a second gap is provided. The additional cushion can thus vary the rigidity of the bearing bush.

The auxiliary pad, particularly in an alternative embodiment, does not contact the outer sleeve adjacent the second gap and / or the intermediate sleeve adjacent the second gap. By providing the additional cushion, the rigidity of the elastomeric body is changed with small-amplitude vibration as compared with the situation where the auxiliary cushion is not provided. For variations whose amplitude is not greater than the thickness of the second gap in the radial direction, initially the additional cushion does not act, so that a low rigidity is established.

If the additional cushion then touches the intermediate sleeve and / or the outer sleeve, the volume of the elastomeric body that is compressed increases, so that the rigidity increases. For vibrations whose amplitude is greater than the thickness of the second gap, now affects the entire elastomer body, so that the rigidity further increases. By providing the additional cushion, three stiffnesses and a smooth transition between the different stiffness levels can thus be set.

It is preferred that the intermediate sleeve and / or the elastomeric body have a slot extending in the axial direction. Preferably, the slot extends completely through the intermediate sleeve and / or the elastomeric body. By providing the slot can be adjusted by means of bias on the intermediate sleeve and / or the elastomeric body a play-free contact in the sliding mating intermediate sleeve and core.

Another aspect of the invention relates to a method for producing the bearing bush described above, wherein the elastomer body and the protruding region are produced together in a first process step. As an optional second method step, the elastomeric body is connected to the intermediate sleeve, in particular vulcanized onto it. Alternatively, the elastomeric body is connected to the outer sleeve, in particular vulcanized on this. In a third process step, the outer sleeve is then pressed onto the elastomer body. upset. This procedure makes it possible to design the outer contour of the elastomeric body, that is to say the surface of the elastomeric body, which faces the outer sleeve, particularly precisely. In particular, it is possible to provide the additional cushion with a particularly accurate outer contour. In this way, a bushing can be made in which the second gap between the outer sleeve and the elastomeric body is arranged and protrudes the additional cushion of the elastomeric body radially outwardly into the second gap.

The invention will be explained in more detail with reference to the accompanying drawings. Show:

Fig. 1 is a schematic representation of a first embodiment of a

Bushing;

Fig. 2 is a cross-sectional view taken along section line A-A of Fig. 1;

Fig. 3 shows an enlarged detail of a second embodiment of

Bearing bush;

4 shows an enlarged detail of a third embodiment of the bearing bush;

Fig. 5 is an enlarged detail of a fourth embodiment of

Bushing;

Fig. 6 is a schematic representation of the manner of manufacturing the bearing bush according to Fig. 1;

Fig. 7 is a schematic representation of a fifth embodiment of a

Bushing;

Fig. 8 is a schematic representation of a sixth embodiment of a bearing bush;

FIG. 9 is a cross-sectional view taken along section BB of FIG. 8; FIG. 10 is a schematic representation of a seventh embodiment of the bearing bush in a sectional view along the section line BB; and

1 1 is a schematic representation of an eighth embodiment of the

Bearing bush.

A bushing 10 has a core 1 1, an intermediate sleeve 12, a

Elastomer body 13, an outer sleeve 16 and a stopper 17 on. The core 1 1 serves to attach the bearing bush 10 to a part of a vehicle. In particular, the core 1 1 has an axial bore through which a bolt for fastening the bearing bush 10 can be pushed.

The core 1 1 is optionally a one-piece component. On the core 1 1, the stopper 17 may be pressed. The stop device 17 is formed in the embodiments shown in Figure 1 by a first annular disc 17a and a second annular disc 17b, which are each pressed onto the core 1 1. The stop device 17 serves to limit an axial deflection of the intermediate sleeve 12 relative to the core 11.

The intermediate sleeve 12 is rotatably mounted on the core 1 1 in a circumferential direction via a first gap 18. Further, the first gap 18 extends between the intermediate sleeve 12 and the stopper 17. When installing the bearing bush 10, the first gap 18 is closed so far that between the core 1 1 and the intermediate sleeve 12, a play-free sliding bearing is generated. Further, the first gap 18 is reduced in the provision of the stopper 17 such that even between the stopper 17 and he intermediate sleeve 12 a play-free sliding bearing is generated. Thus, the intermediate sleeve 12 is also rotatably mounted relative to the stop means 17. The first gap 18 is thus shown enlarged in the figures. The first gap 18 is filled with a lubricant, in particular a grease, to provide a low-wear sliding bearing of the intermediate sleeve 12 to the core 1 1 and the stopper 17 or to adjust the sliding properties targeted. Further, by providing the lubricant, the static friction coefficient and the sliding friction coefficient can be adjusted, which can contribute to the prevention of noise. In the embodiment shown in FIG. 1, the intermediate sleeve 12 has four counter-projections 22 which project in the radial direction in the direction of the outer sleeve 16. Two of the counter protrusions 22 provided at the axial ends of the intermediate sleeve 12 may be configured as the first restricting protrusion 12a and the second restricting protrusion 12b. An axial outer side of the first and second limiting projections 12a, 12b, which faces the stop device 17, in particular the first annular disc 17a and the second annular disc 17b, is parallel to the extent of the first annular disc 17a and the second annular disc 17b.

The outer sleeve 16 has projections 21 which project in the radial direction from the outer sleeve 16 in the direction of the intermediate sleeve 12. The outer sleeve 16 has a first axial end portion 16a and a second axial end portion 16b disposed at the axial ends of the outer sleeve 16 and facing the first restricting protrusion 12a and the second restricting protrusion 12b, respectively.

Between the outer sleeve 16 and the intermediate sleeve 12 of the elastomeric body 13 is provided. The elastomer body 13 is vulcanized to the intermediate sleeve 12. In the embodiment shown in FIG. 1, a second gap 24 is provided between the elastomeric body 13 and the outer sleeve 16, in particular in the region of the first end region 16 a, of the second end region 16 b and between the projections 21. The second gap 24 preferably extends in the complete circumferential direction. Likewise, the projections 21 and the counter-projections 22 may optionally extend in the complete circumferential direction.

The elastomeric body 13 has a protruding region 13 a, which is formed uniformly in substance with the elastomeric body 13. The protruding portion 13a protrudes in the axial direction beyond the intermediate sleeve 12, and more preferably beyond the first restricting projection 12a and the second restricting projection 12b. The protruding portion 13 a is provided at both axial ends of the bushing 10.

In the embodiment shown in FIG. 1, the projecting region 13a bears against a peripheral side 17c of the stop device 17. In particular, the projecting portion 13 a first sealing lips 14, which rest on the peripheral side 17 c of the stopper 17. By providing the first sealing lips 14, the bearing surface between the projecting portion 13a and the stopper 17 is reduced, which minimizes the contact surface upon rotation of the outer sleeve 16 and thus the intermediate sleeve 12 relative to the core 1 1 and thus the stopper 17 and thus a good Sealing effect at the same time longer durability allows. By means of the projecting portion 13a, the first gap 18 is sealed, so that the lubricant from the first gap 18 can not escape and the entry of dirt into the first gap 18 is prevented.

The protruding region 13a optionally has a second sealing lip 15, which rests against the outer sleeve 16, in particular at the first axial end region 16a and the second axial end region 16b. The second sealing lip 15 seals the second gap 24, so that no dirt can penetrate into the second gap 24. The first sealing lip 14 and / or the second sealing lip 15 are optionally formed uniformly material with the protruding portion 13 a.

As can be seen in particular from Fig. 2, the outer sleeve 16 is formed in two parts. In particular, the two parts of the outer sleeve 16 consist of two half-shells which touch one another in the installed state on an edge extending in the axial direction.

The embodiment of the bearing bush 10 shown in FIG. 3 is identical to the embodiment shown in FIG. 1 except for the following differences. The first gap 18 is provided in this embodiment not only between the two projections 21, but also between the two counter-projections 22. The second gap 24 is in each case arranged between the outer sleeve 16 and the elastomer body 13. Furthermore, the elastomeric body 13 has an additional cushion 26 with a convexly curved outer contour 26a. The additional cushion 26 extends into the second gap 24. In the embodiment shown in FIG. 3, the additional cushion 26 is arranged in each case between two counter-projections 22. In addition, the thickness of the elastomer body 13 between the projection 21 and the counter projection 22 is selected such that the elastomer body 13 between the projection 21 and the counter projection 22 is compressed. The elastomer body 13 is compressed between the protrusion 21 and the counter protrusion 22 in the region where the elastomer body 13 extends substantially in the radial direction. This means that if the outer sleeve 16 is not provided, the thickness of the elastomeric body 13 is greater (see dashed line in Fig. 3), as when the outer sleeve 16 is provided. The thickness of the elastomer body 13 is greater than the distance between axial side surfaces of the projection 21 and the counter projection 22 in the region of the extension in the axial direction.

Axial side surfaces of the protrusions 21 and / or the counter protrusions 22 are nearly perpendicular to the axial direction, that is, almost parallel to the radial direction. A deviation of up to ± 25 °, in particular up to + 15 °, is possible, as indicated for example in Fig. 1. Further, the projection 21 and the counter projection 22 overlap in the radial direction, so that between the projections 21 and the counter projection 22, a toothing is achieved.

The overlap in the radial direction between the projection 21 and the counter-projection 22 is as large as possible, so that as much elastomer body 13 between the projection 21 and the counter-projection 22 at a deflection in the axial direction is effective, whereby a high axial stiffness can be achieved. The axial rigidity of the bearing bush 10 can be further increased by providing as many projections 21 and counter projections 22 as possible. Also, the bias of the elastomer body 13 between the projection 21 and the counter-projection 22 in the axial direction increases the axial rigidity.

With the increase of the axial rigidity, the radial rigidity of the bushing 10 increases as well. To counteract this effect, the second gaps 24 are provided. The second gap 24 serves, in particular, as a freewheel, so that in the case of radial vibrations having an amplitude which is smaller than the thickness of the second gap 24 in the radial direction, the rigidity of the additional cushion 26 is primarily is effective. For this purpose, the additional cushion 26 abuts on the projection 21 and thus on the outer sleeve 16. Only when the additional cushion 26 is fully compressed, the elastomeric body 13 in the region of the second gap 24, in which no additional cushion 26 is provided, in contact with the outer sleeve 16, so that this region of the elastomer body 13 is also effective. In this procedure, thus, a progressive course of the characteristic of the stiffness sets. In particular, by providing the second gap 24 with and without additional cushion 26, the increase in radial stiffness associated with increasing the axial stiffness can be compensated.

The embodiment of the bearing bush 10 shown in FIG. 4 corresponds to the embodiment shown in FIG. The only difference is that the additional cushion 26 is not provided between two counter-projections 22, but between two projections 21.

The embodiment of the bearing bush 10 shown in FIG. 5 is identical to that shown in FIGS. 3 and 4 except for the fact that the elastomeric body 13 is connected to the outer sleeve 16 and not to the intermediate sleeve 12. For example, the elastomeric body 13 may be vulcanized to the outer sleeve 16. Optionally, the protruding region 13a bears against an axial outer side 16c of the outer sleeve 16, in particular the protruding region 13a is vulcanized on an axial outer side 16c of the outer sleeve 16. The second gap 24 is thus provided between the elastomeric body 13 and the intermediate sleeve 12, wherein the additional cushion 26 projects radially inwardly into the second gap 24. The second sealing lip 15 protrudes radially inward from the elastomeric body 13 and abuts against the intermediate sleeve 12.

The assembly of the bearing bush 10 according to FIG. 1 is shown in FIG. 6. First, the core 1 1 is provided and pushed onto this the intermediate sleeve 12. Before pushing on the intermediate sleeve 12, the elastomer body 13 with the protruding region 13a has optionally been vulcanized onto the intermediate sleeve 12. After the intermediate sleeve 12 is pushed onto the core 1 1, the stopper 17 is connected to the core 1 1, for example by Pressing. Following this, the two parts of the outer sleeve 16 are applied to the elastomer body 13.

Optionally, in all the embodiments shown, the elastomeric body 13 can be vulcanized to both the intermediate sleeve 12 and to the outer sleeve 16, wherein in particular the projecting portion 13a on the axial outer side 16c of the outer sleeve 16 is also vulcanized. Furthermore, it is possible that the elastomeric body 13 is vulcanized exclusively on the outer sleeve 16.

The bearing bush 10 according to FIG. 7 coincides with the bearing bush 10 according to FIG. 1 and differs only in that the protruding area 13 a does not bear against a peripheral side 17 c of the stop device 17. Rather, the protruding portion 13a abuts an axial side of the stopper 17, which faces the intermediate sleeve 12. In addition, in each case a recess 28 is provided on the intermediate sleeve 12, in particular on the first limiting projection 12a and the second limiting projection 12b, in which the projecting portion 13a is arranged. The protruding region 13a is thus arranged between the intermediate sleeve 12, in particular the first and second limiting projections 12a and 12b, and the stop device 17, in particular the first annular disc 17a and the second annular disc 17b. In this case, the first sealing lip 14 protrudes from the intermediate sleeve 12 in the axial direction to the stop device 17.

The bushing 10 of FIG. 8 is consistent with the bushings 10 of FIG. 1 except for the following differences. In addition, the bearing bush 10 according to FIG. 8 has a recess 23 in the form of a lubricant groove 23a. The recess 23 serves to receive lubricant and thus acts as a lubricant reservoir. The recess 23 may also be formed as a pocket. In the embodiment shown in Fig. 8, the lubricant groove 23a is disposed in the intermediate sleeve 12 and extends over the full axial length thereof. Further, the lubricant groove 23a extends in the radial direction along the first and second restricting protrusions 12a, 12b. The lubricant groove 23a is, as can be seen in FIG. 9, optionally provided uniformly distributed in the circumferential direction. The bushing 10 of FIG. 10 is consistent with the bushings 10 of FIG. 1 except for the following differences. In the bearing bushing 10 according to FIG. 10, a slot 30 extending in the axial direction and / or at a slight angle to the axial direction is provided. The slot 30 extends in the radial direction through the intermediate sleeve 12 and the elastomer body 13. With the aid of the slot 30, a bias after application of the outer sleeve 16 can be applied and the radial thickness of the first gap 18 can be adjusted.

The bushing 10 of FIG. 1 1 is consistent with the bushings 10 of FIG. 1 to 10 match, except that the core 1 1 is formed in two parts. A first core part 1 1 a and a second core part 1 1 b are separated from each other by a section in the radial direction. In this embodiment, the stop device 17 is formed as a protruding element, which is integrally formed with the first core part 1 1 a and the second core part 1 1 b.

LIST OF REFERENCE NUMBERS

bearing bush

core

a first core part

b second core part

intermediate sleeve

a first limiting projection

b second limiting projection

elastomer body

a projecting area

first sealing lip

second sealing lip

outer sleeve

a first end area

b second end region

c axial outside

stop device

a first annular disc

b second annular disc

c peripheral side

first gap

head Start

counter-projection

recess

a lubricant groove

second gap

additional cushion

a outer contour

return

slot

Claims

claims

1 . Bushing, comprising

a core (1 1),

an intermediate sleeve (12) surrounding the core (1 1) extending in a circumferential direction,

an outer sleeve (16) surrounding the intermediate sleeve (12) extending in the circumferential direction,

an elastomeric body (13) which is arranged between the intermediate sleeve (12) and the outer sleeve (16), and

an abutment means (17) projecting at axial ends of the core (11) from the core (11) in a radial direction and restricting movement of the intermediate sleeve (12) in an axial direction,

wherein the intermediate sleeve (12) is rotatably mounted on the core (1 1) and opposite the stop device (17) in the circumferential direction,

the outer sleeve (16) having a plurality of projections (21),

wherein the intermediate sleeve (12) has at least one counter-projection (22) which overlaps in the radial direction with the projections (21) for limiting the axial deflection of the outer sleeve (16) relative to the core (1 1), and

wherein the elastomeric body (13) has a projecting portion (13a) which projects beyond the intermediate sleeve (12) in the axial direction and bears sealingly against the stop device (17).

2. Bearing bush according to claim 1, characterized in that the protruding region (13a) rests against a peripheral side (17c) of the stop device (17).

3. Bearing bush according to claim 1 or 2, characterized in that the intermediate sleeve (12) at axial ends in each case a limiting projection (12a, 12b) projecting in the radial direction from the intermediate sleeve (12).

4. Bearing bush according to one of the preceding claims, characterized in that the projecting portion (13a) between the stop means (17) and the intermediate sleeve (12), in particular between the stop means (17) and the limiting projection (12a, 12b) is arranged ,

5. Bearing bush according to claim 4, characterized in that the intermediate sleeve (12) on an axial side, which faces the stop means (17), and / or the stop means (17) on an axial side, which faces the intermediate sleeve (12) is, has a recess (28), in which preferably the projecting portion (13a) is arranged.

6. Bearing bush according to one of the preceding claims, characterized in that the projecting region (13a) has at least one first sealing lip (14), which rests against the stop device (17).

7. Bearing bush according to one of the preceding claims, characterized in that a surface between the intermediate sleeve (12) and the core (1 1) and / or between the intermediate sleeve (12) and the stop means (17) is provided with a lubricant.

8. Bearing bush according to claim 7, characterized in that the core

(1 1) and / or the intermediate sleeve (12) has at least one recess (23) for receiving the lubricant, in particular in the form of a lubricant groove (23a) extending in the axial direction.

9. Bearing bush according to claim 8, characterized in that the recess (23) on an axial outer side of the intermediate sleeve (12) which faces the stop means (17) is arranged.

10. Bearing bush according to one of the preceding claims, characterized in that the Elastomerkorper (13) on the outer sleeve (16) is vulcanized.

1 1. Bearing bush according to one of the preceding claims, characterized in that the elastomeric body (13) from the outer sleeve (16) and / or from the intermediate sleeve (12) is partially spaced by a second gap (24).

12. Bearing bush according to claim 1 1, characterized in that the elastomeric body (13) has a second sealing lip (15) which seals the second gap (24).

13. Bearing bush according to claim 1 1 or 12, characterized in that the second gap (24) between two projections (21) and / or between two GE genvorsprüngen (22) is arranged.

14. Bearing bush according to one of claims 1 1 to 13, characterized in that the elastomeric body (13) has an additional cushion (26) which extends into the second gap (24).

15. Bearing bush according to one of the preceding claims, characterized in that the intermediate sleeve (12) and / or the elastomeric body (13) has a slot extending in the axial direction (30).