axle carrier bearing

Abstract

Bushing bearing (1) for a motor vehicle, in particular an axle support bearing for supporting a vehicle axle relative to a motor vehicle body, comprising a bearing core (2), an elastomer body (6) enclosing the bearing core (2) at least in sections, and an outer sleeve (4) which engages around the elastomer body (6) and is designed to bear against a boundary surface of a bearing receptacle assigned to the bushing bearing (1), wherein the outer sleeve (4) has at least one locking element (40, 41) extending radially to its outer circumferential surface and elastically deflectable in the radial direction for producing a positive connection with a locking element of the bearing receptacle that is designed to be complementary to the locking element (40, 41) of the outer sleeve (4), and wherein the at least one locking element (40, 41) of the outer sleeve (4) has a tab (40) cut free in sections from the outer sleeve (4), which tab has an end stem extending perpendicular to the axis (A, S) of the outer sleeve (4). extending locking lug (41),which is designed for locking with the associated complementary locking element of the bearing receptacle, designed as a locking recess (71), wherein the tab (40) and the locking lug (41) form a locking tab such that the tab (40) can be deflected perpendicular to the axis (A, S) of the outer sleeve (4), characterized in that the tab (40) of the at least one locking element (40, 41) of the outer sleeve (4) is backed at least in sections in the radial direction with an elastomer material (62).

Description

[0001] The present invention relates to a bushing bearing for a motor vehicle, in particular an axle carrier bearing for supporting a vehicle axle relative to a motor vehicle body, according to the preamble of claim 1. Furthermore, the invention relates to a bearing system comprising a bushing bearing according to the invention and a method for producing a bushing bearing according to the invention.

[0002] Bushing bearings, especially axle carrier bearings, are well known in the field. For example, axle carrier bearings, also known as subframe bearings, are used in both the front and rear axle areas of the motor vehicle between the vehicle body or chassis and the chassis to reduce the transmission of noise and disturbing vibrations into the passenger compartment. While the load capacity of an axle carrier bearing in the vehicle's transverse direction should be comparatively high in order to achieve sufficient guidance stability when cornering, the spring constant in the vehicle's longitudinal direction can usually be set relatively low in order to gently absorb the reaction forces resulting from acceleration and deceleration and thus increase ride comfort. As a rule, the spring constant in the vehicle's vertical direction of the bearing is adjusted to ride comfort by specifying a spring travel.The described operating conditions of the bearing place particularly increased demands on the connection of the outer sleeve of the bush bearing with the associated boundary surface defining the bearing mount, which in conventional bush bearings is generally defined as a frictional connection, i.e. the outer sleeve of the bearing rests force-fittingly on the associated boundary surfaces of the bearing mount.

[0003] To reduce weight and costs, at least parts of conventional axle carrier bearings are now manufactured from plastic, for example, using an injection molding process, which allows any desired design to be produced cost-effectively. For example, the outer sleeve of such an axle carrier bearing can be formed as an injection-molded part made of a plastic material, particularly a reinforced plastic material such as a glass-fiber-reinforced plastic. Typically, the bearing support is provided by a hollow cylindrical metal part.Particularly in such an embodiment in which the outer sleeve of the axle carrier bearing is made of a plastic material, it is essential for maintaining the operational function of the bearing that all operating forces can be safely dissipated without there being a risk that the connection between the outer sleeve of the bearing and the limiting sections or surfaces defining the bearing support allows a relative movement to one another.

[0004] A bushing bearing, in particular an axle carrier bearing, for supporting a vehicle axle relative to a motor vehicle body, comprising a bearing core, an elastomer body enclosing the bearing core at least in sections, and an outer sleeve which engages around the elastomer body and is designed to bear against a boundary surface of a bearing receptacle assigned to the bushing bearing, is disclosed, for example, in DE 10 2012 213 028 A1. DE 10 2011 080 452 A1 relates to a control arm with a force-transmitting element and at least one bearing eye arranged on the end stem of the force-transmitting element, which receives a bushing bearing comprising an inner bearing part, at least one elastomer body, and a bushing element arranged radially outwardly of the elastomer body. The bushing element has a locking element which extends circumferentially from an axially extending recess to an end face of the longitudinally slotted bushing element.DE 31 08 701 A1 discloses a device for the elastic mounting of machines or machine parts, comprising an inner fastening part with an outer housing and a rubber body arranged therebetween. The rubber body carries at least one cam on its surface interacting with the fastening part and / or the housing, wherein the fastening part and / or the housing has at least one recess corresponding to the base surface of the cam and receiving it. The generic DE 10 2013 007 459 A1 relates to a device for securing the outer sleeve of a rotationally symmetrical assembly bearing, which is inserted into a receiving eye of a support part, wherein the bearing comprises an outer sleeve, an elastomer body, and an inner bearing part. The outer sleeve has a radially resilient locking lug that engages behind the receiving eye in the assembled state.

[0005] The invention is based on the object of providing a bushing bearing which can be designed in particular as a rear axle support bearing and can be produced cost-effectively without the operability suffering and in particular a sufficient load transfer can be provided between the outer sleeve of the bushing bearing and the material sections providing the bearing holder.

[0006] This object is already achieved in terms of the device by a bushing bearing having the features of claim 1. The bushing bearing according to the invention, in particular an axle carrier bearing, has a bearing core, an elastomer body enclosing the bearing core at least in sections, and an outer sleeve, in particular comprising a plastic, which surrounds the elastomer body and is designed to bear against a boundary surface of a bearing receptacle assigned to the bushing bearing. The outer sleeve has at least one locking element extending radially to an outer circumferential surface of the outer sleeve for producing a positive connection, in particular a positive locking connection, with an associated locking element of the bearing receptacle, which is designed to be complementary to the locking element of the outer sleeve.According to the invention, the at least one locking element of the bushing bearing has a locking lug extending perpendicular to the axis of the outer sleeve, which is designed to lock with the associated, complementary locking element of the bearing receptacle associated with the bushing bearing. According to the invention, the at least one locking element of the outer sleeve has a tab cut free from the outer sleeve in sections, which supports the locking lug at its end and forms a locking tab with the latter, such that the tab can be deflected perpendicular to the axis of the outer sleeve. The bushing bearing according to the invention is characterized in that the tab of the at least one locking element of the outer sleeve is backed at least partially in the radial direction with an elastomer material.

[0007] The invention is based on the idea of ​​improving the frictional connection of conventional bush bearings in an associated bearing receptacle, which can be weakened particularly in embodiments in which the outer sleeve of the bush bearing is made of a plastic material and a sleeve of the bearing receptacle receiving the bush bearing is made of a metal material, by additionally providing a positive connection in the form of a latch between the bearing receptacle and bush bearing or between the bearing receptacle and the outer sleeve of the bush bearing by the described design of the bush bearing according to the invention. The latching element of the outer sleeve and the associated, complementarily designed latching element of the bearing receptacle can be designed in such a way that a positive latching connection is provided between the bearing receptacle and bush bearing or outer sleeve in the circumferential direction and / or in the axial direction.It should be noted that the design of the bush bearing according to the invention can also be designed to cooperate with a bearing receptacle which provides plastic contact surfaces for the outer sleeve of the bush bearing according to the invention and the associated, complementarily designed locking element of the bearing receptacle.

[0008] Because the radially extending locking element is designed to be elastically deflectable in the radial direction, the locking element of the outer sleeve can be elastically deflected when the bush bearing according to the invention is inserted into the associated bearing receptacle, in particular initially elastically deflected radially inwards, so that when the bush bearing and associated bearing receptacle are joined together, no significantly increased effort of force is required compared to conventional bush bearings, wherein after an alignment of the locking element of the bush bearing with the locking element of the bearing receptacle during the insertion of the bush bearing into the bearing receptacle, the two associated locking elements are brought into engagement with one another, whereby a positive connection can be established between the bearing receptacle and the bush bearing or between the bearing receptacle and the outer sleeve of the bush bearing.It can be provided that after the alignment of the associated locking elements to one another, the locking element of the bush bearing according to the invention, which is elastically deflected in the radial direction, pivots back in the radial direction into a predetermined operating position, whereby the described positive connection between the associated locking elements is set.

[0009] In order to provide the described positive connection between the bush bearing or the outer sleeve of the bush bearing and the bearing receptacle, it is provided according to the invention that the at least one locking element of the outer sleeve or of the bush bearing has a locking lug extending perpendicular to the axis of the outer sleeve, which is designed and configured to lock with the associated, complementarily designed locking element of the bearing receptacle assigned to the bush bearing. It can further be provided that this associated, complementary locking element of the bearing receptacle is designed as a locking recess, in which the locking lug of the locking element of the bush bearing is locked in an operating state, ie in an installed state, to provide a positive connection between the bush bearing or its outer sleeve and the bearing receptacle. The locking lug extending perpendicular to the axis of the outer sleeve, ieThe radially extending locking lug is designed or configured to be elastically deflectable in the radial direction. The locking lug of the locking element can have a predetermined circumferential extension dimension relative to the outer sleeve, wherein a radial boundary surface of the locking lug can lie on a ring section whose radius origin or center can lie on the bushing axis.

[0010] In such embodiments in which the bearing receptacle can be designed as a receiving sleeve, this receiving sleeve can have the said locking recess as a complementary locking element to the associated locking element of the outer sleeve of the bush bearing according to the invention.

[0011] In order to provide the specified elastic deflectability of the locking element in the radial direction, it is provided that the locking element in the outer sleeve has a tab which is partially cut out of the outer sleeve and which carries the locking lug of the at least one locking element at its end, i.e. at its free end, and together with this forms a locking element designed as a locking tab which is designed and configured to deflect perpendicular to the axis of the outer sleeve. Expediently, it can be provided that the locking lug is integrally formed on the free end of the tab and / or is rigidly connected to the tab. The tab can be elongated and, depending on the embodiment, extend axially and / or circumferentially on the outer sleeve. This elongation means the longitudinal extent of the tab, i.e. the extent with the greatest dimension.Preferably, the longitudinal extension of the tab of the locking tab can run essentially parallel to the longitudinal axis of the beech bearing. This tab of the locking tab is also referred to as the locking arm.

[0012] In order to simplify the assembly of the bush bearing according to the invention with the associated bearing receptacle and / or to improve the positive connection between the bush bearing according to the invention and the associated bearing receptacle by locking them, it is provided that the tab of the at least one locking element of the outer sleeve is at least partially backed in the radial direction with an elastomer material.

[0013] Further features of the invention as well as further embodiments of the invention are set out in the following general description, the figures, the description of the figures and the dependent claims.

[0014] In a particularly expedient embodiment, the bearing core of the bushing bearing according to the invention can be provided with a metal, in particular aluminum or steel, and / or the elastomer body can comprise an elastically deformable plastic, such as vulcanizates of natural rubber or silicone rubber. Preferably, the outer sleeve can comprise or be made of a plastic material, in particular a reinforced, for example, glass-fiber-reinforced plastic material.

[0015] In order to dissipate all occurring operating forces, particularly in embodiments in which the bushing bearing according to the invention can be designed as an axle carrier bearing, it can be expediently provided that the elastomer body arranged between the outer sleeve and the bearing core is bonded to them in a materially bonded manner, for example by vulcanization. This allows forces acting on the bearing, in particular, and extending in the axial or tangential direction, to be reliably dissipated.

[0016] To further improve the connection and thus to improve the load transfer between the outer sleeve of the bush bearing according to the invention and the bearing receptacle, it can be expediently provided that the outer sleeve has a plurality of such locking elements, which can be arranged offset from one another in the axial or circumferential direction, in particular on the outer shell side of the outer sleeve, and which are designed to each cooperate with an associated locking element of the bearing receptacle, which is designed to be complementary to the respective locking element of the outer sleeve, in order to provide a respective positive connection.

[0017] It can be provided that the locking elements of the outer sleeve are offset from one another, but otherwise have the same construction.

[0018] To provide a radial inward deflection of the tab, it can be provided that in the region of the tab of the at least one locking element of the outer sleeve, the sum of the radial thickness of the tab and the radial thickness of the cutout is less than the radial thickness of the outer sleeve. Such a design has the advantage that the radially inner boundary surface of the tab is delimited from the elastomer body by material of the outer sleeve, i.e., the cutout of the tab forms a cavity between the tab and an inner boundary surface of the outer sleeve.

[0019] As described above, the invention provides that the tab of the at least one locking element of the outer sleeve is backed at least partially in the radial direction with an elastomer material. This elastomer material can expediently represent a section of the elastomer body and / or be injection-molded or vulcanized together with the elastomer body onto the outer sleeve. In particular, it can be provided that a cavity between the tab and the radially inner interface of the outer sleeve to the tab, i.e. the space where the tab is cut free, is at least partially filled with elastomer material, in particular in order to increase the restoring force upon deflection of the locking element of the bush bearing radially inwards, which restoring force can thus be composed of the force components resulting from the elastic displacement of the elastomer and the elastic deflection of the locking tab of the locking element.

[0020] It can be provided particularly advantageously that the backing of the at least one locking element of the bush bearing, which can be designed as a locking tab as described, with an elastomer material can include not only the backing of the tab but also the backing of the locking lug, so that in this embodiment an elastomer backing with a restoring force caused thereby can be realized over the entire longitudinal extent of the locking tab.

[0021] In order to provide a corresponding free surface during the described deflection of the elastomer arranged for the backing of the locking tab, it can be expediently provided that the elastomer backing has at least one, in particular several, for example parallel, recesses. For example, it can be provided that at least one, in particular several, recesses extending in particular parallel to the longitudinal extent of the locking tab, in particular tubular or rod-shaped recesses, are arranged or configured within the elastomer backing.

[0022] In order to increase the value of the extrusion force which is necessary in order to press the bush bearing according to the invention out of the bearing receptacle in the axial direction, it can be expediently provided that the locking tab is elastically deflected radially outwards in the rest position by the elastomer deposited on the tab in order to increase the restoring force acting on the locking tab.

[0023] All components of the bush bearing according to the invention can be adapted to the respective operating requirements. For example, the elastomer body can comprise reinforcement, in particular in the form of an intermediate sleeve, to increase radial rigidity. It should be noted that the elastomer body does not have to be rotationally symmetrical, but can instead have a radial rigidity that depends on the circumferential position. Similarly, the bearing core can also be non-rotationally symmetrical. It can have an inner part, in particular a metal part, in particular a rotationally symmetrical part, onto which a bearing core shell comprising a plastic material can be molded, for example by means of an injection molding process. For direction-dependent adjustment, in particular of a radial and / or axial rigidity, this bearing core shell can be non-rotationally symmetrical.Such a bearing core comprising several materials has the advantage of reduced weight and / or a relatively easy-to-manufacture shell surface for the realization of predetermined, direction-dependent characteristics of the bearing.

[0024] For further weight savings, the bearing core shell and / or the outer sleeve can be provided with several recesses, in particular honeycomb-like sections, which can also offer manufacturing advantages. These honeycomb-like structures can extend axially, radially, or tangentially to the bearing axis.

[0025] The above object is further achieved on the device side by a bearing system comprising a bushing bearing designed according to the invention and a bearing receptacle assigned to the bushing bearing, wherein the bearing receptacle has an inner circumferential surface defining a free space for receiving the bushing bearing, on which the locking element of the bearing receptacle is arranged, which is designed to be complementary to the locking element of the outer sleeve of the bushing bearing. Depending on the embodiment, this bearing receptacle can be arranged, for example, on a subframe or a subframe of a motor vehicle. The bearing receptacle can, for example, be sleeve-shaped, in particular comprise a metal sleeve, which is fastened, for example, to the subframe or the subframe.In this respect, in one embodiment, the system according to the invention can comprise a bushing bearing according to the invention and a receiving sleeve which has a locking element designed complementary to the locking element of the bushing bearing, in particular in the form of a recess.

[0026] The above-mentioned object is further achieved by a method for producing a bush bearing according to the invention comprising a bearing core, an elastomer body enclosing the bearing core at least in sections and an outer sleeve which surrounds the elastomer body and is designed to bear against a boundary surface of a bearing receptacle assigned to the bush bearing, with the steps: - Providing the storage core; - Providing an injection mold for overmolding the bearing core with an elastomer to produce the elastomer body; - Inserting the bearing core into the injection mold; - Providing the outer sleeve comprising a locking region having at least one locking element extending radially to the outer circumferential surface of the outer sleeve and elastically deflectable in the radial direction for producing a positive connection with a locking element of the bearing receptacle that is designed to be complementary to the locking element of the outer sleeve, wherein the locking element has a tab that is cut out of the outer sleeve in sections and that carries a locking lug on the end stem that extends perpendicular to the axis of the outer sleeve and forms a locking tab with this, such that the tab can be deflected perpendicular to the axis of the outer sleeve, wherein the locking lug is designed to lock with the associated complementary locking element, designed as a locking recess, of a bearing receptacle associated with the bush bearing; - Inserting the outer sleeve into the injection mold; - Producing the elastomer body by overmolding the bearing core located in the injection mold and the outer sleeve with an elastomer, wherein the locking region of the outer sleeve is at least partially radially under-injected with the elastomer in such a way that the tab of the at least one locking element is at least partially backed in the radial direction with an elastomer material.

[0027] A locking region on the outer sleeve can, in particular, comprise a locking tab arranged radially outward, cut free from the rest of the outer sleeve, onto which a radially elastically deflectable locking lug can be formed, in particular formed integrally therewith. The elastic deflectability in the radial direction can be provided essentially by the tab of the locking tab, which can be radially deflected in the radial direction relative to fixed sections of the outer sleeve. As shown, it can be provided that the locking lug is arranged at the free end of the locking tab or that the locking lug forms an end section of the locking tab.

[0028] The invention is explained below by describing an embodiment together with modifications with reference to the accompanying figures, in which Fig. 1 shows an embodiment of a bush bearing designed according to the invention in the type of an axle carrier bearing in a perspective view, Fig. 2a the bearing core of the axle carrier bearing of the Fig. 1 in a perspective view, Fig. 2b the bearing core of the Fig. 2a in a front view, Fig. 2c the bearing core of the Fig. 2b in a section in plane AA, Fig. 2d the bearing core of the Fig. 2b in a section in plane BB, Fig. 3a the outer sleeve of the axle carrier bearing of the Fig. 1 in a perspective view, Fig. 3b the outer sleeve of the Fig. 3a in a front view, Fig. 3c the outer sleeve of the Fig. 3b in a representation of a section in the plane AA, Fig. 3d the outer sleeve of the Fig. 3b in the representation of a section in the plane BB, Fig. 3e a detailed view of area Y of the Fig. 3D, Fig. 4a the axle carrier bearing of the Fig. 1 in a front view, Fig. 4b shows a section of the axle carrier bearing of the Fig. 4a in level AA, Fig. 4c the axle carrier bearing of the Fig. 4a in the representation of a section in the plane BB, Fig. 4d an enlarged view of the detail section Y of the Fig. 4c, Fig. 5a in a perspective view the axle carrier bearing of the Fig. 1 inserted into a subframe sleeve of a bearing support assigned to the bearing, Fig. 5b the recorded camp of the Fig. 5a in a sectional view corresponding to the representation of the Fig. 4c, and Fig. 5c an enlarged detailed view of area Y of the Fig. 5bshows.

[0029] The bushing bearing according to the invention is described below in the form of an axle carrier bearing, which can be used to dampen disturbing vibrations in the chassis and their transmission to the vehicle body. In the overview of the Fig. 1 shows an axle carrier bearing 1 designed according to the invention, comprising a bearing core 2 and an outer sleeve 4 enclosing the bearing core, wherein an elastomer body 6 is arranged radially between the bearing core 2 and the outer sleeve 4, which in the described embodiment is vulcanized both to the bearing core 2 and to the outer sleeve 4. Such a bushing bearing can be inserted into an associated bearing receptacle, for example into a sleeve of a subframe, which can therefore be designed as a bearing receptacle. In the embodiment according to the invention, the axle carrier bearing 1 has a locking element, here in the form of a locking tab, which is elastically deflectable in the radial direction of the bearing and for this purpose has a tab or arm 41 cut free from the remainder of the outer sleeve 4, at the free end of which a locking lug 40 is arranged.In this embodiment, the axle carrier bearing 1 has two such locking elements designed as locking tabs, which are offset from one another by 180°, so that in the illustration of the . Fig. 1 one of these locking tabs is covered and thus not visible. The locking tab can extend in its longitudinal extent parallel to the bearing axis A, S, wherein the tab and / or the locking lug are curved, adapted to the bearing receptacle (not shown), in particular with a radius of curvature corresponding to the distance of the surface of the locking tab or the locking lug to the axis A, S of the bearing. In a manner to be described below, the locking element of the Fig. 1 specified axle carrier bearing 1 in an operating position, ie with the bearing 1 according to the invention inserted into the associated bearing receptacle, with a complementarily designed locking element of a sleeve which is designed to receive the bearing, together to form a positive connection between the axle carrier bearing 1 and the associated bearing receptacle.

[0030] The Fig. 2a to 2d show the structure of the bearing core 2 of the described embodiment of an axle carrier bearing 1 in different views. Fig. 1 shows a perspective view showing that the bearing core 2 has an inner part 20 with a central passage 21, here for receiving a fastening bolt. The inner part can be formed, in particular, from a metallic material, for example, aluminum or steel. The bearing inner part can be designed to be purely cylindrical on its outer surface, while a bearing core shell 30, in particular made of a plastic material, can be applied, for example, injection-molded, to form the outer surface of the bearing core 2, so that the bearing core shell 30 and the inner part 20 can be connected in a materially bonded or form-fitting manner. To set predetermined characteristics in predetermined directions, the bearing core shell can be designed to be variable both in the circumferential direction and in the axial direction. In the described embodiment, the bearing core shell 30 has circumferentially successive honeycomb sections 31a, b and 32a, b.As can be seen, the respective similar honeycomb sections 31a, b and 32a, b are arranged circumferentially offset by 180° around the inner part 20. While the honeycomb sections 32a, b have a radial height that decreases starting from an end face in the axial direction of the bearing, this is not the case for the honeycomb sections 31a, b circumferentially adjacent to the honeycomb sections 32a, b; their radial extent is essentially constant in the axial direction of the bearing. As one skilled in the art will recognize, the outer surface of the bearing core 2 or the bearing core shell 30 can be flexibly adjusted depending on requirements. By providing the specified recesses 33, 34 in the honeycomb sections, disadvantageous material accumulations can be avoided during injection molding, resulting in a positive cost effect due to the material savings.Furthermore, the described honeycomb structure supports the vulcanization of the elastomer body to the surface of the bearing core shell 30. As can be seen from the figures, the longitudinal extension of the honeycombs can run essentially parallel to the axis of the bearing core 2 or the axle carrier bearing 1.

[0031] Fig. 2b shows the bearing core 2 in a front view, in relation to the representation of the Fig. 2a with a view of the rear, non-visible frontal surface. Fig. 2c and Fig. 2d show the bearing core 2 in the Fig. 2b indicated sections AA and BB.

[0032] The Fig. 3a to 3e show the structure of the outer sleeve of the axle carrier bearing 1 according to the invention of Fig. 1, where Fig. 3a shows the outer sleeve in a perspective side view. In the described embodiment, the outer sleeve is approximately cylindrical, with a front lug or collar 46 formed on one of the two end faces. In the described embodiment, the outer sleeve can be made of a fiber-reinforced, in particular glass-fiber-reinforced plastic, for example, by means of an injection molding process. To reduce weight, radial recesses 48 can be provided, particularly on the outer surface and distributed around the circumference.

[0033] Out of Fig. 3a also shows a locking tab formed on the outer surface, comprising a tab 40 extending in its longitudinal extent parallel to the axis of the outer sleeve or the bearing, at the free end of which a locking lug 41 is formed, which extends radially outwards. To design the tab, axially extending and circumferentially extending cutouts 42, 43 can be designed, so that the locking tab designed as described can be deflected in the radial direction due to the elastic properties of the plastic. Due to the described design, this deflection can take place on a circular section perpendicular to the circumference of the outer sleeve 4, wherein the radius corresponds approximately to the axial extent of the tab 40. It can be provided that the tab 40 does not extend over the entire radial extent (D0) of the outer sleeve 4 in the area of ​​the locking tab, but with a smaller radial thickness (Dl), so that between the Fig. 3a concealed, radially lower boundary surface of the tab 40 and the inner surface of the outer sleeve 4, a wall section of the outer sleeve remains, which will be discussed again below.

[0034] Fig. 3b shows the outer sleeve of the Fig. 3a in a front view with a view of the Fig. 3a visible end face, whereby on the left end face of the outer sleeve the end flap 46 has been broken away in sections for clarity of illustration. Fig. Sections AA and BB shown in Figure 3b are in the Fig. 3c, d. As can be seen, the outer sleeve 4 has two longitudinal recesses 49 spaced apart from one another in its wall 45, wherein the thickness of the wall in the sections offset by 180° in the longitudinal direction starting from the end face of the Fig. 3b continuously decreases until the area towards the opposite end face, in which the recess ends and the wall 45 has its smallest radial extent. Circumferentially offset by 90°, the sectional view of the Fig. 3d shows the arrangement of two locking tabs, each offset by 180°, each comprising a tab 40 and a locking lug 41 arranged at its free end, which extends radially outwards. This figure also shows that the locking tab does not extend radially over the entire thickness or radial extent of the wall 45, but is thinner with a thickness Dl, wherein a radial cutout 44 with a radial thickness Df of the locking tab can be provided, which extends over the entire longitudinal extent of the locking tab, comprising the tab 40 and the locking lug 41 and beyond in the direction of an end face, so that this cutout 44 represents a recess or a cavity, which extends below the locking tab and over its entire surface extent up to the end tab 46, see also Fig. 3a. Fig. 3e shows section Y of the Fig. 3d in an enlarged detailed view showing the radial thickness D0 of the outer sleeve in the area of ​​the tab 40, the radial thickness Dl of the tab and the radial thickness Df of the free cut.

[0035] The Fig. 4a to 4d show the finished axle support bearing according to the invention of the Fig. 1 after vulcanizing an elastomer body 6 to the radially inner bearing core 2 and the outer sleeve 4 radially outer to the elastomer body 6. Fig. 4a shows a front view corresponding to the Fig. 2b, Fig. 3b of the individual views of the bearing core 2 and the outer sleeve 4. The arrangement of the elastomer body 6 radially between the outer sleeve 4 and the bearing core 2 shows in particular Fig. 4b in section AA, which in Fig. 4a. The elastomer body can have a single elastomer layer, as in the described embodiment. Furthermore, it can also be provided to arrange a radial intermediate layer made of a material that is rigid relative to the elastomer, such as a plastic or a metal, so that the elastomer body can then have two radial elastomer layers and an intermediate layer, in particular in the form of an intermediate sleeve. Those skilled in the art will recognize that the precise geometric design can be adapted to the specific requirements of the bearing.

[0036] Fig. 4c shows the axle carrier bearing 1 in the section BB of the Fig. 4a with two sectional plane halves offset from each other to show circumferentially spaced sections radially below the locking tabs. As can be seen from the Fig. 4c, the elastomer body 6 in the described embodiment is formed in the longitudinal direction into the areas of both end faces to provide end-face elastomer buffers 61 and 64, respectively. The figure also shows that in the area of ​​the right-hand section of the Fig. 4c the radial cutout 44 of the locking tab is filled with an elastomer backing 62, while in the area of ​​the left cutting plane of the Fig. 4c the clearance 44, see Fig. 3d / e to provide free spaces for the elastomer backing of the locking tab, has a gap extending axially to the bearing. In the described embodiment, the elastomer backing 62 of the respective locking tab comprises several, for example two, such gaps or recesses, which can, for example, be polygonal in cross-section, in particular square or round, and can run over the entire longitudinal extent of the locking tab and, due to manufacturing reasons, can be open at the front in the area of ​​the elastomer buffer 61. As the person skilled in the art will recognize, the elastomer backing of the locking tab can support the setting and holding of the desired positive connection between the locking element of the axle carrier bearing and an associated locking element of the bearing mount. Fig. 4d shows section Y of the Fig. 4c, in which the cutout of the locking tab has an elastomer backing 62, in an enlarged detailed view.

[0037] The Fig. 5a to 5c show the operating situation of the axle carrier bearing 1 according to the invention, in which it is pressed into a bearing receiving sleeve 70 of a subframe (not shown), wherein the locking lug 41 of the locking tab of the outer sleeve 4 is brought into engagement with an associated locking recess 71 of the bearing receiving sleeve 70. The locking of the visible locking elements of the Fig. 5a, the locking elements are circumferentially offset by 180°, is realized in the same way in the described operating situation. The described locking of the bearing designed according to the invention with the bearing receptacle, in addition to the frictional connection between the bearing and the bearing sleeve provided by the pressing in of the bearing, also provides a positive connection, which in the described embodiment acts both in the axial and circumferential direction. As can be seen in particular from the Fig.As can be seen from Figure 5c, the end tab or collar 46, which provides an axial stop 47, is designed to engage with an end face of the sleeve 70.

[0038] In another embodiment, it may also be provided to arrange more than two, for example three or four circumferentially spaced locking tabs on the axle carrier bearing 1, each of which interacts with a complementarily designed locking element in the form of a locking recess of a bearing receiving sleeve to provide an axial and circumferential positive connection between the two components. List of reference symbols 1 axle carrier bearing, bush bearing 2 bearing core 4 Outer sleeve 6 elastomer bodies 20 inner part, inner element 21 Implementation 22a, b groove 30 bearing core shell 31a, b honeycomb section 32a, b honeycomb section 33, 34 Recess / longitudinal recess 40 Tab, locking arm 41 locking lug 42 extensive clearance 43 axial free cutting 44 radial free cutting 45 wall 46 forehead flap, collar 47 stop 48 Radial recess 49 Longitudinal recess 61 Elastomer buffer / elastomer collar 62 Elastomer backing 63 gap, recess 64 elastomer buffers / elastomer collars 70 subframe sleeve, bearing support sleeve 71 Recess D0 radial thickness of the outer sleeve Dl radial thickness of the tab Df radial thickness of the clearance cut A, S axis

Claims

[1] Bushing bearing (1) for a motor vehicle, in particular axle carrier bearing for supporting a vehicle axle relative to a motor vehicle body, comprising a bearing core (2), an elastomer body (6) enclosing the bearing core (2) at least in sections, and an outer sleeve (4) which engages around the elastomer body (6) and is designed to bear against a boundary surface of a bearing receptacle assigned to the bushing bearing (1), wherein the outer sleeve (4) has at least one locking element (40, 41) extending radially to its outer circumferential surface and elastically deflectable in the radial direction for producing a positive connection with a locking element of the bearing receptacle which is designed complementarily to the locking element (40, 41) of the outer sleeve (4), and wherein the at least one locking element (40, 41) of the outer sleeve (4) has a tab (40) cut free in sections from the outer sleeve (4), which tab has an end stem extending perpendicular to the axis (A, S) of the outer sleeve (4) extending locking lug (41),which is designed for locking with the associated complementary locking element of the bearing receptacle, designed as a locking recess (71), wherein the tab (40) and the locking lug (41) form a locking tab, such that the tab (40) can be deflected perpendicular to the axis (A, S) of the outer sleeve (4), , characterized by that the tab (40) of the at least one locking element (40, 41) of the outer sleeve (4) is backed at least in sections in the radial direction with an elastomer material (62). [2] Bush bearing (1) according to claim 1, characterized by in that the outer sleeve (4) has a plurality of locking elements (40, 41) which are arranged offset from one another in the axial and / or circumferential direction and which are designed to cooperate with an associated locking element of the bearing receptacle which is designed to be complementary to the respective locking element (40, 41) of the outer sleeve (4) in order to provide a respective positive connection. [3] Bush bearing (1) according to claim 1 or 2, characterized by that in the region of the tab (40) of the at least one locking element (40, 41) of the outer sleeve (4), the sum of the radial thickness (Dl) of the tab (40) and the radial thickness (Df) of the free cut is less than the radial thickness (D∅) of the outer sleeve (4). [4] Bush bearing (1) according to one of claims 1 to 3, characterized by that the locking lug (41) of the at least one locking element (40, 41) of the outer sleeve (4) is backed by an elastomer (62). [5] Bush bearing (1) according to one of claims 1 to 4, characterized by that the elastomer backing (62) of the tab (40) has at least one recess (63) extending in the longitudinal direction of the tab (40). [6] Bush bearing (1) according to claim 4 or 5, characterized bythat the locking tab is elastically deflected radially outwards in the rest position perpendicular to the outer sleeve (4) by the elastomer (62) deposited on the tab (40) in order to increase the restoring force acting on the locking tab. [7] Bush bearing (1) according to one of claims 1 to 6, characterized by that the bearing core (2) has at least one bearing core shell (30) formed radially onto an inner part (20). [8] Bush bearing (1) according to claim 7, characterized by that the bearing core shell (30) has several recesses (33, 34). [9] Bush bearing (1) according to one of the preceding claims, characterized by that the elastomer body (6) is non-rotationally symmetrical around the inner core (2) for the predetermined setting of a circumferential angle-dependent radial stiffness. [10] Bush bearing (1) according to one of the preceding claims, characterized bythat the elastomer body (6) is vulcanized to the bearing core (2) and / or the outer sleeve (4). [11] Bush bearing (1) according to one of the preceding claims, characterized by that the outer sleeve (4) has at least one radial recess (48) on its outer surface. [12] Bearing system, comprising a bush bearing (1) according to one of claims 1 to 11 and a bearing receptacle assigned to the bush bearing (1), wherein the bearing receptacle has an inner circumferential surface defining a free space for receiving the bush bearing (1), on which the locking element complementary to the locking element (40, 41) of the outer sleeve (4) of the bush bearing (1) the bearing holder is arranged. [13] Method for producing a bush bearing (1) for a motor vehicle comprising a bearing core (2), an elastomer body (6) enclosing the bearing core (2) at least in sections and an outer sleeve (4) which encompasses the elastomer body (6) and is designed to bear against a boundary surface of a bearing receptacle assigned to the bush bearing (1), with the steps - Providing the bearing core (2); - Providing an injection mold for overmolding the bearing core (2) with an elastomer to produce the elastomer body (6); - Inserting the bearing core (2) into the injection mold; - Providing the outer sleeve (4) comprising a locking region having at least one locking element (40, 41) extending radially to the outer circumferential surface of the outer sleeve (4) and elastically deflectable in the radial direction for generating a positive connection with a locking element of the bearing receptacle that is designed to be complementary to the locking element (40, 41) of the outer sleeve (4), wherein the at least one locking element (40, 41) of the outer sleeve (4) has a tab (40) that is cut free in sections from the outer sleeve (4), which tab carries a locking lug (41) extending perpendicular to the axis (A, S) of the outer sleeve (4) at its end and forms a locking tab with the latter, such that the tab (40) is deflectable perpendicular to the axis (A, S) of the outer sleeve (4), wherein the locking lug (41) is designed to lock with the associated complementary locking element designed as a locking recess (71) of a Bush bearing (1) associated bearing holder; - Inserting the outer sleeve (4) into the injection mould; - producing the elastomer body (6) by overmolding the bearing core (2) located in the injection mold and the outer sleeve (4) with the elastomer, wherein the locking region of the outer sleeve (4) is at least partially radially under-injected with the elastomer in such a way that the tab (40) of the at least one locking element (40, 41) of the outer sleeve is at least partially backed in the radial direction with an elastomer material (62). [14] Method for producing an axle carrier bearing (1) according to claim 13, characterized by that the step of providing a storage core (2) comprises the steps: - Providing at least one inner element (20) of the bearing core (2); - Providing an injection mold for overmolding the inner element (20) with a plastic to produce the bearing core (2); - introducing the inner element (20) into the injection mold for overmolding the inner element (20); - producing the bearing core (2) by overmolding the inner element located in the injection mold for injecting a bearing core shell (30) onto the inner element (20).

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