WO2020043390A1

WO2020043390A1 - Bearing bush for a blind hole and steering gear suspension for a vehicle

Info

Publication number: WO2020043390A1
Application number: PCT/EP2019/069424
Authority: WO
Inventors: Hilrich Kardoes; Philipp Werner; Andreas Höper
Original assignee: Vibracoustic Gmbh
Priority date: 2018-08-30
Filing date: 2019-07-18
Publication date: 2020-03-05
Also published as: CN112585376A; CN112585376B; EP3662178A1; DE102018121219B4; DE102018121219A1

Abstract

The invention relates to a bearing bush (10) for a blind hole (50), in particular for a blind hole (50) of a steering gear housing (52), comprising a core (12) with a first axial end (18) and a second axial end (20). The core (12) has a collar (24) which protrudes in a radial direction (R) at the first axial end (18), an elastomer body (14) which is secured to an outer face (32) of the core (12) and has a first axial stop (36), a second axial stop (38), and a central section (34), and a pre-assembly bush (16) which surrounds the central section (34) of the elastomer body (14). The collar (24) overlaps with the pre-assembly bush (16) in a radial direction in an overlap region, the first axial stop (36) extends between the collar (24) and the pre-assembly bush (16) at least in the overlap region, and the second axial stop (38) extends parallel to the first axial stop (36).

Description

Bushing for a blind hole and steering gear suspension for a vehicle

The invention relates to a bearing bush for a blind hole, in particular for a blind hole of a steering gear housing. The bearing bush comprises a core and an elastomer body which is attached to an outer surface of the core. The invention further relates to a steering gear suspension for a vehicle, which comprises a steering gear housing, a body, a fastening element and the bearing bush mentioned above.

As a rule, the steering gear is to be decoupled from the body in terms of vibration. For this purpose, bearing bushes or decoupling elements are known, as are described, for example, in DE 10 2012 024 653 A1. In it, two externally non-adherent bushes are screwed together in a through hole in the body. The two bushings have collars, which are each provided on the outside of the through hole, so that the two bushings are prevented from slipping out, although no interference fit ensures the tight fit. As a result, two sockets are required to prevent slipping out.

Furthermore, solutions are known in which the bushings contain elements which, when installed, are larger than the intended mounting hole and thus prevent axial slipping out after assembly or are capable of generating sufficient axial rigidity.

Because part of the bushing is always larger than the hole, it is not possible to mount the bushing in a blind hole, but it must always be installed in a through hole. The object of the invention is to provide a bearing bush or a steering gear suspension which has a more compact design and is therefore more space-saving, the bearing bush having similarly good decoupling properties to known bearing bushes.

The object is achieved by the bearing bush according to claim 1 and by the steering gear suspension according to claim 10.

Preferred embodiments of the invention are defined in the dependent claims.

The invention relates to a bearing bush for a blind hole, in particular a blind hole of a steering gear housing. The bearing bush comprises a core, an elastomer body and a pre-assembly sleeve. The core has a first axial end and a second axial end and has a collar which protrudes from the core in a radial direction at a first axial end. The elastomer body is fastened to an outer surface of the core and has a first axial stop, a second axial stop and a central section. The pre-assembly sleeve surrounds the central section of the elastomer body. The collar and the pre-assembly sleeve overlap in the radial direction in an overlap area. The first axial stop extends at least in the overlap area between the collar and the pre-assembly sleeve. The second axial stop extends parallel to the first axial stop.

The invention further relates to an arrangement which comprises the above-mentioned bearing bush and a blind hole.

The invention also relates to a steering gear mount for a vehicle, which comprises a steering gear housing with a blind hole, a body, a bearing bush as described above, and a fastening element. The bearing bush is held in the blind hole by means of a positive connection between the blind hole and the pre-assembly sleeve. The pre-assembly sleeve is in turn fixed in the blind hole by means of a press fit. The core of the bearing bush is fastened to the body by means of the fastening element. The advantage of the invention is that the blind hole and the bearing bush can be made short in the axial direction and thus save space. In addition, it is not necessary to use two bushings to fasten the steering gear as in the prior art due to the fastening of the bearing bush by means of a form fit by means of two collars, but the use of a bearing bush according to the present invention is sufficient. In addition to a smaller axial expansion and thus a space saving, this also results in a material saving since only one bearing bush has to be used.

At the same time, the bearing bush has great freedom of design for the elastomer body, since it is non-adherent on the outside. A high degree of axial rigidity can thus be represented, which is provided by the use of the preassembly sleeve in conjunction with the first axial stop and the second axial stop. With a force acting on the bearing bush in the axial direction, the pre-assembly sleeve is pressed against the collar with the interposition of the first axial stop, so that this results in high axial rigidity or a pronounced progression of rigidity can be set. When an axial force is applied in the opposite direction, the second axial stop contributes to the axial rigidity and its progression of rigidity. The use of a pre-assembly sleeve in connection with a high axial stiffness, which is provided by the provision of the first and second axial stops, can also be installed captively in a blind hole in a blind hole. It is not the fact that the elastomer is stuck in the blind hole eye that is decisive for the squeezing force, i. H. the force that is necessary to drive the bearing bush out of the blind hole, but the tight fit of the pre-assembly sleeve in the eye of the blind hole.

The steering gear suspension in the vehicle deals with the fastening of a steering gear housing or a steering gear with a housing to a body of the vehicle. Ordinary steering gears or bodies can be used for this. However, in the invention, the steering gear housing has a blind hole, by means of which the steering gear housing is attached to the body. For this purpose, according to the invention, a bearing bush is provided, which can be press-fit, also as a non-adherent tight fit or interference fit can be referred to, is held in the blind hole. The bearing bush is therefore no longer connected to the blind hole, but is held in the blind hole solely by the frictional force. The core of the bearing bush is fastened to the body by means of a fastening element.

In cross section, the blind hole can be described by a base, which shows a projecting area in cross section at the respective ends. In perspective, this protruding area is a cylinder that protrudes from the base. In the assembled state, the cylindrical region preferably surrounds the bearing bush in a circumferential direction. The bearing bush is inserted into the cavity defined by the base and the cylindrical area and held by an interference fit. In particular, the pre-assembly sleeve is through

Press fit held on the cylindrical portion of the blind hole. The pre-assembly sleeve is thus in contact with the cylindrical area.

The bearing bush and / or the blind hole can be constructed to be rotationally symmetrical. The bearing bush can also be referred to as a decoupling element and serves to decouple vibrations between the steering gear housing and the body.

The core can be constructed to be rotationally symmetrical, in particular with respect to an axis parallel to the axial direction. The core has in particular a central bore which extends through the core in the axial direction, in particular completely, and is preferably provided with an internal thread. A fastening means can be carried out through this hole, by means of which the core can be fastened to the body. A screw is preferably screwed from the body into the core provided with an internal thread. The fastener can include a screw or a bolt. However, the fastener is not necessarily a screw or a bolt; the core can be attached to the body using other fastening means.

In the axial direction, the core has a first axial end and a second axial end. The core is preferably with the first axial end in the Blind hole is inserted so that the first axial end of the core is adjacent or in contact with the base of the blind hole.

At the first axial end, the core has a collar which protrudes from the core in the radial direction, that is to say perpendicular to the axial direction. The core can thus be T-shaped in cross section. The collar can also be viewed as a flange or a protrusion extending in the circumferential direction. The collar is preferably provided continuously in the circumferential direction, but can have cutouts in the circumferential direction. In addition to the collar, the core has an outer surface, which can also be referred to as the outer surface of the core. The collar protrudes radially in comparison to the outer surface of the core. The outer surface defines a cylinder surface, in particular a cylinder with a circle as the base surface. Alternatively, this base area can e.g. also be oval.

The elastomer body serves to decouple vibrations. An elastomer body can thus be understood to mean any body and any material by means of whose vibrations can be damped or absorbed. In particular, the elastomer body is designed to be resilient, that is to say it can be reversibly compressed and stretched with the generation of a restoring force. The elastomer body is fastened to the outer surface of the core, in particular the elastomer body is vulcanized firmly to the outer surface of the core.

The elastomer body can be constructed to be rotationally symmetrical, in particular to an axis parallel to the axial direction. The central section is in particular fastened directly to the outer surface of the core and preferably extends in the circumferential direction as well as in the axial direction on the outer surface of the core. For decoupling vibrations in the radial direction, the central section is primarily provided, which is compressed or expanded in the event of vibrations in the radial direction. In particular, in the case of vibrations in the radial direction, the core moves in the radial direction with respect to the preassembly sleeve and thus with respect to the blind hole.

The pre-assembly sleeve can be constructed to be rotationally symmetrical, in particular to an axis parallel to the axial direction. The pre-assembly sleeve can Have the shape of a hollow cylinder and surrounds the central portion of the elastomer body in the circumferential direction. The pre-assembly sleeve preferably completely surrounds the central section of the elastomer body in the circumferential direction. However, recesses or cutouts or raised structures such as, for example, longitudinal ribs can also be provided in the preassembly sleeve.

In the installed state, the pre-assembly sleeve lies against the inner wall of the blind hole, in particular against the preferably cylindrical region of the blind hole. In particular, an outer diameter of the pre-assembly sleeve in the unassembled state is slightly larger than an inner diameter of the blind hole, in particular of the cylindrical region, so that the pre-assembly sleeve can be press-fitted into the blind hole. The pre-assembly sleeve is, in particular, of such a firm design that it can withstand the forces that occur. In particular, the pre-assembly sleeve is provided with such a thickness and / or made from such a material that the press fit produces a sufficiently high pressing force. The pre-assembly sleeve can be constructed from metal or plastic.

The collar and the pre-assembly sleeve overlap radially, that is to say in the radial direction at least in the overlap region. This means that the collar has an outer diameter which extends in the radial direction and which is larger than an inner diameter of the preassembly sleeve which extends in the radial direction. The collar and the pre-assembly sleeve thus overlap in the radial direction. At least in this overlap area, the first axial stop of the elastomer body is provided at least partially between the collar and the pre-assembly sleeve. When a force acting in the axial direction is applied, the pre-assembly sleeve is thus moved against the core and thus against the collar, as a result of which the first axial stop is compressed.

The first axial stop extends, in particular also completely, along a first side surface of the collar. The first side surface of the collar can be completely through the elastomer body in the radial direction, in particular especially the first axial stop. The side surface of the pre-assembly sleeve, which is in contact with the first axial stop, can also be completely or partially covered in the radial direction and / or in the circumferential direction by the first axial stop.

The second axial stop extends parallel to the first axial stop, i. H. in the radial direction. The second axial stop is arranged adjacent to the first axial stop in the axial direction. The second axial stop contributes to the axial rigidity when a force acts on the bearing bush in the axial direction that is opposite to the direction in which the first axial stop is compressed. The provision of the second axial stop in conjunction with the first axial stop means that the bearing bush has a high degree of axial rigidity in opposite axial directions.

It is preferred that the second axial stop is arranged at the second end of the core.

The second axial stop preferably overlaps in the radial direction with the preassembly sleeve and is in particular in contact with a side surface of the preassembly sleeve. This means that the second axial stop has an outer diameter in the radial direction which is larger than the inner diameter of the pre-assembly sleeve. The second axial stop is provided at the second end of the core to abut a surface of the body. The second axial stop is thus arranged in the assembled state of the bearing bush between the body and the pre-assembly sleeve and can thus support the axially acting force. In particular, the second axial stop can be formed flush with a side surface of the core at the second end. The first axial stop and the second axial stop are thus provided at opposite ends of the pre-assembly sleeve.

The first axial stop and the second axial stop preferably extend continuously in the circumferential direction. However, the first and second axial stops can have cutouts or recesses or protruding structures in the circumferential direction or, for example, be oval. It is preferred that the second axial stop is arranged on a side surface of the collar, which faces away from the pre-assembly sleeve.

This side surface is referred to below as the second side surface of the collar. In this embodiment, the first and the second side surface of the collar are preferably covered in sections with the elastomer body at least in the circumferential direction and / or in the radial direction. In the installed state of the bearing bush, the second side face of the axial stop lies against the preassembly sleeve, in particular against its base. The second axial stop in this embodiment is thus provided between the collar and the blind hole in order to absorb axial forces. Since the second axial stop is arranged on the second side surface of the collar, the latter is compressed when the force acts in the opposite direction compared to a force for compression of the first axial stop. With regard to the thickness and arrangement of the second axial stop in this embodiment, the considerations made in connection with the first axial stop apply.

It is possible that the elastomer body also has a radial stop which is arranged on a peripheral surface of the collar.

The peripheral surface of the collar extends in particular parallel to the outer surface of the core. The circumferential surface of the collar can be provided completely, partially, in sections in the circumferential direction or only at individual points with the radial stop of the elastomer body. In particular, the radial stop has a thickness which extends in the radial direction and which is less than the thickness of the central section of the elastomer body which extends in the radial direction.

The radial stop limits radial deflections of the core with respect to the blind hole. First, the central section of the elastomer body is compressed and from a certain compression of the central section, the radial stop interacts with the blind hole, in particular with the cylindrical region of the blind hole. The radial stop can thus be provided at a distance from the blind hole in the radial direction. However, it is also possible that the radial stop is permanently on the blind hole, in particular the cylindrical region of the blind hole. In this embodiment, the radial stop generally has a greater thickness than when the radial stop is spaced from the blind hole in the radial direction.

It is preferred that the pre-assembly sleeve is free of a material-uniform connection to the elastomer body. The pre-assembly sleeve is therefore not uniformly connected to the elastomer body, for example the elastomer body is not vulcanized onto the pre-assembly sleeve. There is therefore no material connection between the pre-assembly sleeve and the elastomer body, but a positive connection and / or non-positive connection can be provided.

It is preferred that an outer diameter of the bearing bush is defined by the pre-assembly sleeve.

This means that the pre-assembly sleeve protrudes the farthest from the core in the radial direction. Thus, only the pre-assembly sleeve touches the blind hole in the radial direction, i. that is, only the pre-assembly sleeve lies against the cylindrical area of the blind hole. In this embodiment, the radial stop is then arranged at a distance from the blind hole, in particular the cylindrical region of the blind hole. In this variant, the radial stop serves as a buffer, since it only contributes to damping radial vibrations when the core is deflected relative to the pre-assembly sleeve.

The bearing sleeve preferably lies against the blind hole along the circumferential direction exclusively via an outer surface of the pre-assembly sleeve, in particular when the pre-assembly sleeve has a hollow cylindrical shape. Preferably, only an outer surface of the pre-assembly sleeve defines the outer diameter of the bearing bush. The preassembly sleeve can protrude furthest in the radial direction from the other components of the bearing bush, in particular a cylindrical outer surface of the preassembly sleeve protrudes the furthest in the radial direction.

It is preferred that the elastomer body is formed in one piece or that the second axial stop as a separate element is not made of the same material as the central section. This has the advantage that the central section, the first axial stop, the second axial stop and / or the radial stop can be produced in one process step, for example in an injection molding step. In particular if the second axial stop is arranged on the second side surface of the collar, the radial stop is provided in order to provide a connection between the first axial stop and the second axial stop. Alternatively, the second axial stop can be produced as a separate element and not connected to the rest of the elastomer body, in particular with the central section, in the same material.

It is preferred that the central section of the elastomer body is not necessarily made rotationally symmetrical, but rather is designed freely. Thus, it can have a protruding area that contacts the preassembly sleeve and a protruding area that is spaced in the radial direction from the preassembly sleeve.

Thus there can be at least one area on an inner surface of the pre-assembly sleeve which does not directly touch the elastomer body, in particular its central section, in the radial direction. This recess in a cross-sectional view serves as a space in which the usually incompressible elastomer body can escape when compressed. When viewed in the axial direction, the recessed area or areas can be provided at the axial end of the pre-assembly sleeve, but it is also possible for the recessed areas to be spaced in the middle or in the axial direction.

The elastomer body can be constructed to be rotationally symmetrical, in particular to an axis parallel to the axial direction. However, it is also possible that, in particular, the central section and in particular the protruding area are only provided in sections in the circumferential direction (for example opposite one another). In this way, the bearing bush can have a different stiffness in a radial direction than, for example, in a radial direction provided perpendicular to it. It is preferred that the pre-assembly sleeve is formed in one piece or in several parts.

The bearing bush is preferably constructed pre-assembled, i. H. the dismantling sleeve is stationary on the elastomer body and the core. This is particularly easy if the pre-assembly sleeve is formed in one piece and is thus non-positively, for example by prestressing the elastomeric central section in the radial direction against the inside of the pre-assembly sleeve, or in a form-fitting manner, for example by the arrangement of the first and second axial stops on both sides in the axial direction, to which the pre-assembly sleeve is attached.

It is also possible for the pre-assembly sleeve to be formed in two, three or more parts. In this case, the bearing bush can also be designed in a non-preassembled state. In this case, to mount the bearing bush, the bearing bush is only fitted with the preassembly sleeve before the bearing bush is pressed into the blind hole. In order to be able to pre-assemble the pre-assembly sleeve with a multi-part design, the individual parts of the Vomnonta sleeve can be connected to one another by means of an O-ring or snap connections. This is particularly successful when the pre-assembly sleeve is made of plastic. To attach an O-ring, the pre-assembly sleeves are preferably provided with corresponding grooves into which the O-ring or rings can be inserted, so that pressing the assembly into the blind hole is not hindered by the O-ring. This means that the O-ring can remain on the preassembled module during assembly.

It is preferred that the blind hole has a base with an opening and a cylindrical region protruding from the base, the first end of the core preferably being arranged adjacent to the base and, for example, the outer diameter of the collar being larger than an inner diameter of the Opening is.

The opening in the base can advantageously be present so that, for example, air can escape during assembly. It could also be used to make it easier to install the fastener, for example. In loading preferred embodiment, however, the bearing is overhung and screwed only from the body side. Therefore, a preferred form of the core is provided with an internal thread. Despite the opening, the collar of the core is held at the base of the blind hole by positive locking.

Preferred embodiments of the invention will now be explained with reference to the accompanying drawings. In it show:

Figure 1 is a cross-sectional view of a bearing bush without pre-assembly sleeve.

FIG. 2 shows a cross-sectional view of the bearing bush according to FIG. 1 with a pre-assembly sleeve;

Fig. 3 is a perspective view of the bearing bush according to FIG. 1 without

Pre-assembly sleeve;

Fig. 4 is a cross-sectional view of the bearing bush according to Figs. 1 to 3 in assembled condition without fastening element;

5 shows a further embodiment of the bearing bush in the assembled state without a fastening element; and

Fig. 6 shows another embodiment of the bearing bush in the assembled state without a fastener.

A bearing bush 10 according to the present invention has a core 12, an elastomer body 14 and a pre-assembly sleeve 16. The bearing bush 10 is preferably designed to be rotationally symmetrical, the axis of rotation extending parallel to an axial direction A. A radial direction R extends perpendicular to the axial direction A. A circumferential direction U extends around the axial direction A and thus perpendicular to the axial direction A and the radial direction R.

The core 12 has a first axial end 18 and a second axial end 20. The core 12 is optionally constructed to be rotationally symmetrical. The core 12 is preferably provided with a central bore 22 which extends completely through the core 12 in the axial direction A. This central bore 22 can be provided in whole or in part with an internal thread 23. A fastening means, not shown in the figures, can be guided through or into the central bore 22.

At the first axial end 18, the core 12 has a collar 24 which protrudes from the central region of the core 12 in the radial direction R. The collar 24 has a first side surface 26 and a second side surface 28, both of which extend in the radial direction R. The collar 24 also has a circumferential surface 30, which connects the first side surface 26 to the second side surface 28. The circumferential surface 30 extends in the circumferential direction U and is in particular parallel to the axial direction A. The core 12 furthermore has an outer surface 32 which extends parallel to the circumferential surface 30. The outer surface 32 is preferably cylindrical in shape. The collar 24 protrudes from the outer surface 32 in the radial direction R.

The elastomer body 14 has a central section 34, a first axial stop 36, a second axial stop 38 and / or a radial stop 40. The elastomer body 14 can also be rotationally symmetrical.

The elastomer body 14 is preferably formed in one piece, so that the central section 34, the first axial stop 36, the second axial stop 38 and / or the radial stop 40 are connected to one another. Alternatively, the second axial stop 38 can be produced as a separate element and not connected to the rest of the elastomer body 14, in particular to the central section 34, in the same material. The central section 34, the first axial stop 36 and / or the radial stop 40 can be formed in one piece in this case.

The elastomer body 14, in particular the central section 34, is fastened, in particular vulcanized, to the outer surface 32 of the core 12. The central section 34 has a projecting area 42 and a recessed area 44. The projecting area 42 projects further in the radial direction R from the outer surface 32 of the core 12 than the recessed area 44. A recess in FIG the central portion 34 of the elastomer body 14 defined. The recessed areas 44 may be provided at both ends of the protruding portion 42 in the axial direction A and extend in the circumferential direction U. However, it is also possible for the recessed area 44 to be provided at a different location on the central section 34 or only on one side.

As is shown in particular in FIG. 3, the projecting region 42 can only be arranged in sections in the circumferential direction U, for example on opposite sides of the core 12. In this way, the bearing bush 10 can have a different stiffness in a radial direction R than in FIG a radial direction R provided perpendicular thereto. The recessed area 44 thus also extends in the axial direction A.

The first axial stop 36 protrudes from the core 12 in the radial direction R. The first axial stop 36 bears against the first side surface 26 of the collar 24. The first axial stop 36 extends in the radial direction R completely along the first side surface 26 of the collar 24. In another embodiment, however, it can only be executed in sections in the radial direction R. The first axial stop 36 extends completely in the circumferential direction U, but in another embodiment it can also be provided only in sections in the circumferential direction U.

The second axial stop 38 is in the in Fig. 1 to 4 shown embodiment provided at the second end 20 of the core 12. The second axial stop 38 also extends from the core 12 in the radial direction R. The second axial stop 38 is preferably provided flush with the second axial end 20 of the core 12. The second axial stop 38 extends completely in the circumferential direction U, but in another embodiment it can only be provided in sections in the circumferential direction U.

The optionally provided radial stop 40 bears against the peripheral surface 30 of the collar 24. The thickness of the radial stop 40 in the radial direction R is less than the thickness of the protruding area 42 also seen in the radial direction R. The pre-assembly sleeve 16 has a hollow cylindrical shape and extends in the circumferential direction U around the central section 34. The pre-assembly sleeve 16 is preferably constructed to be rotationally symmetrical. The preassembly sleeve 16 is provided in the radial direction A above the projecting area 42 and the recessed area 44. Thus, the recessed area 44 with the pre-assembly sleeve 16 defines a cavity in the elastomer body 14, whereby the projecting area 42 can deflect in the radial direction R when the elastomer body 14 is compressed. The pre-assembly sleeve 16 is made of plastic or metal and is shown in FIGS. 1 to 3 shown embodiment constructed in one piece.

The pre-assembly sleeve 16 has an inner diameter which is smaller in the radial direction R than an outer diameter of the collar 24. Thus, the pre-assembly sleeve 16 and the collar 24 overlap in the radial direction R. In this section referred to as the overlap region in the radial direction R at least the first axial stop 36 is provided. The first axial stop 36 thus preferably touches a side surface of the pre-assembly sleeve 16, which faces the collar 24.

An outer diameter of the pre-assembly sleeve 16 in the radial direction R is in particular larger than an outer diameter of the first axial stop 36, the second axial stop 38 and the radial stop 40. An outer diameter of the second axial stop 38 is larger than the inner diameter of the pre-assembly sleeve 16. This has the technical effect that when the core 12 is deflected in the axial direction A with respect to the pre-assembly sleeve 16, either the first axial stop 36 or the second axial stop 38 is compressed, whereby the axial rigidity of the bearing bush 10 is decisively provided .

The preassembly sleeve 16 is connected to the elastomer body 14 in a form-fitting and / or non-positive manner in the non-assembled state. For example, the first axial stop 36 and the second axial stop 38 contribute to the positive locking. However, the pre-assembly sleeve 16 is not integrally connected to the elastomer body 14, in particular to the central section 34. 4 shows an assembled state of the bearing bush 10. A blind hole 50 forms part of a steering gear housing 52. The blind hole 50 and the bearing bush together form a steering gear suspension in the sense of the present invention. Further parts of the steering gear housing 52 are not shown in FIG. 4. The bearing bush 10 is used to fasten the steering gear housing 52 to a body 54, which is also only shown schematically.

The blind hole 50 has a base 56 with an opening 58 and a cylindrical region 60. The base 56 extends in the radial direction R, while the cylindrical region 60 extends in the axial direction A and in the circumferential direction U. In cross section, the base 56 and the cylindrical region 60 are U-shaped, as can be clearly seen in FIG. 4.

The opening 58 is provided coaxially with the central bore 22. An inner diameter of the opening 58 is larger than the diameter of the central bore 22, so that a head of a fastening means, not shown, such as a screw or a bolt, can rest against the core 12. The outer diameter of the core 12 is larger than the inner diameter of the central bore 22, so that the core 12 can bear against the base 56. The core 12 is fastened to the body 54 by means of the central bore 22. Alternatively, the central bore 22 can be provided with an internal thread 23, through which an attachment to the body 54 can take place. The preassembly sleeve 16 lies on its outer surface against an inner surface of the cylindrical region 60. The second axial stop 38 is clamped between the pre-assembly sleeve 16 and the body 54. The collar 24 is in particular in contact with the base 56.

FIG. 5 shows a further embodiment of the bearing bush 10. This embodiment is correct with the embodiment according to FIGS. 1 to 4 agree, except that the pre-assembly sleeve 16 is constructed in several parts. In the variant shown, the pre-assembly sleeve 16 has two half-shells.

FIG. 6 shows a further embodiment of the bearing bush 10. The embodiment according to FIG. 6 is correct with the embodiments according to FIGS. 1 to 4 agree, except for the arrangement of the second axial stop 38. This is not on the provided second axial end 20 of the core 12, but between the base 56 and the second side surface 28 of the collar 24.

The function of the bearing bush 10 is as follows: To mount the bearing bush 10 in the blind hole 50, the pre-assembly sleeve 16 has an outer diameter which is slightly larger than an inner diameter of the cylindrical region 60. The bearing bush 10 can thus be held in the blind hole 50 by press fitting.

In order to dampen vibrations in the radial direction R, the central section 34 is provided, which is compressed in the radial direction R when deflected. In particular, the core 12 moves in relation to the pre-assembly sleeve 16. In order to achieve a high degree of rigidity in the axial direction A, the first axial stop 36 and the second axial stop 38 are provided. With a force acting in the axial direction A, either the first axial stop 36 is compressed between the collar 24 and the pre-assembly sleeve 16 or the second axial stop 38 is compressed between the pre-assembly sleeve 16 and the body 54. Alternatively, in the embodiment according to FIG. 6, the second axial stop 38 is compressed between the collar 24 and the base 56 of the blind hole 50.

Reference list

10 bearing bushes

12 core

14 elastomer body

16 pre-assembly sleeve

18 first axial end

20 second axial end

22 central hole

23 internal thread

24 collar

26 first side surface

28 second side surface

30 peripheral surface

32 outer surface

34 central section

36 first axial stop

38 second axial stop

40 radial stop

42 above area

44 recessed area

50 blind hole

52 Steering gear housing

54 body

56 base

58 opening

60 cylindrical area

A axial direction

R radial direction

U circumferential direction

Claims

Expectations

1. Bearing bush for a blind hole (50), in particular for a blind hole (50) of a steering gear housing (52), comprising

a core (12) with a first axial end (18) and a second axial end (20), the core (12) having a collar (24) which is connected to the first axial end (18) in a radial direction (R )

an elastomer body (14) which is fastened to an outer surface (32) of the core (12) and has a first axial stop (36), a second axial stop (38) and a central section (34), and

a pre-assembly sleeve (16) which surrounds the central section (34) of the elastomer body (14),

wherein the collar (24) and the pre-assembly sleeve (16) overlap in the radial direction (R) in an overlap area,

wherein the first axial stop (36) extends at least in the overlap area between the collar (24) and the pre-assembly sleeve (16),

the second axial stop (38) extending in the radial direction (R),

wherein the pre-assembly sleeve (16) has the shape of a hollow cylinder and an outer diameter of the bearing bush (10) is defined by the pre-assembly sleeve (16).

2. Bearing bush according to claim 1, characterized in that the second axial stop (38) is arranged at the second end (20) of the core (12).

3. Bearing bush according to claim 1 or 2, characterized in that the second axial stop (38) is arranged on a side surface (28) of the collar (24), which faces away from the pre-assembly sleeve (16).

4. Bearing bush according to one of the preceding claims, characterized in that the elastomer body (14) further has a radial stop (40) which is arranged on a peripheral surface (30) of the collar (24).

5. Bearing bush according to one of the preceding claims, character- ized in that the elastomer body (14) is integrally formed or that the second axial stop (38) as a separate element is not made of the same material as the central section (34).

6. Bearing bush according to one of the preceding claims, characterized in that the central section (34) of the elastomer body (14) has a projecting area (42) which contacts the pre-assembly sleeve (16) and a recessed area (44), which is spaced in the radial direction (R) from the pre-assembly sleeve (16).

7. Bearing bush according to one of the preceding claims, characterized in that the pre-assembly sleeve (16) is formed in one piece or in several parts.

8. Bearing bush according to one of the preceding claims, characterized in that the pre-assembly sleeve (16) is free of a material-uniform connection with the elastomer body (14).

9. Steering gear mount for a vehicle, comprising

a steering gear housing (52) with a blind hole (50),

a body (54),

a fastener and

a bearing bush (10),

wherein the bearing bush (10) is held in the blind hole (50) by an interference fit,

the core (12) of the bearing bush (10) being fastened to the body (54) by means of the fastening element,

wherein the bearing bush comprises a core (12) with a first axial end (18) and a second axial end (20), an elastomer body (14) and a pre-assembly sleeve (16), wherein the core (12) has a collar (24) which projects at the first axial end (18) in a radial direction (R),

wherein the elastomer body (14) is attached to an outer surface (32) of the core (12) and has a first axial stop (36), a second axial stop (38) and a central section (34),

wherein the pre-assembly sleeve (16) the central portion (34) of the

Surrounds the elastomer body (14),

wherein the first axial stop (36) extends at least in the overlap area between the collar (24) and the pre-assembly sleeve (16)

the second axial stop (38) extending in the radial direction (R).