CN209920949U

CN209920949U - Axle for self-propelled working machine and self-propelled working machine

Info

Publication number: CN209920949U
Application number: CN201821764149.7U
Authority: CN
Inventors: 马克斯·施赖伯
Original assignee: Zf Frederick Harfin Co Ltd
Current assignee: Zf Frederick Harfin Co Ltd; ZF Friedrichshafen AG
Priority date: 2017-12-21
Filing date: 2018-10-29
Publication date: 2020-01-10
Anticipated expiration: 2028-10-29
Also published as: DE102017223599A1; CN109941044A

Abstract

The utility model relates to an axle and self-propelled work machine for self-propelled work machine. A tandem axle for a mobile working machine usually has a rigid intermediate axle on which the chain cases are arranged on the end sides, respectively. To this end, an axle (1) for a self-propelled working machine is proposed, comprising: a bridge frame housing (2) provided with a support section (2 c); at least one drive case (3) provided with a coupling section (3b), the coupling section and a support section being arranged coaxially with reference to the main axis of rotation (H), the support section extending at least partially within the coupling section; there is also a first bearing assembly (10) for supporting the bridge housing, the first bearing assembly being supported on the one hand on the support section (2c) and on the other hand on the coupling section (3b), wherein the first bearing assembly has an inner bearing device and an outer bearing device (10a, b), which are spaced apart from one another in the axial direction with reference to the main axis of rotation (H).

Description

Axle for self-propelled working machine and self-propelled working machine

Technical Field

The utility model relates to an axle for self-propelled work machine. Furthermore, the utility model discloses still relate to a self-propelled working machine.

Background

Tandem bridges for mobile work machines are known, wherein such tandem bridges usually have a rigid intermediate bridge on which a chain case is arranged on each end side. The two chain cases each comprise a chain drive, wherein the chain drives serve to transmit the drive torque to the drive wheels arranged on the two chain cases. For better off-road performance, it is provided that the drive housing is mounted on the intermediate bridge in a pivotable or pivotable manner by means of a pivot bearing. It is known, for example, from the prior art to design the pivoting bearing as a sliding bearing.

The printed document DE102015212533a1, which forms the closest prior art, describes a mobile work machine tandem axle with a bridge frame that can be fastened to the work machine side, wherein the ends of the bridge frame are each rotatably supported on the drive housing by means of an associated bearing assembly, wherein a sliding bearing arrangement with an outer ring and an inner ring is provided as a bearing assembly.

SUMMERY OF THE UTILITY MODEL

The object of the invention is to provide an axle of the type mentioned at the outset, which is distinguished by better operating characteristics. Furthermore, the utility model discloses the technical problem that will solve still lies in, proposes a corresponding operation machinery with axle.

This technical problem is solved according to the utility model through the axle that has following characteristic and the self-propelled working machine that has this axle. The figures and the description show advantageous embodiments.

An axle is proposed, which is designed and/or adapted for a self-propelled working machine. The axle is in particular designed as a double axle or as a tandem axle. The axle is preferably configured as a driven axle. The axle is preferably configured as a rear axle of the work machine. In principle, the axle has at least two, preferably exactly four wheels.

According to one embodiment of the invention, an axle for a self-propelled working machine has at least one bridge housing for accommodating a transmission, wherein the bridge housing has a support section;

at least one drive housing for accommodating the transfer device, wherein the drive housing has a coupling section, wherein the coupling section and the support section are arranged coaxially with reference to the main axis of rotation, and wherein the support section extends at least partially within the coupling section;

a first bearing assembly, wherein the drive box is rotatably supported on the bridge girder housing by means of the first bearing assembly, wherein the first bearing assembly is supported on the one hand on the support section and on the other hand on the coupling section, wherein,

the first bearing assembly has an inner bearing means and an outer bearing means, wherein the inner bearing means and the outer bearing means are spaced from each other in an axial direction with reference to the main axis of rotation.

The axle has at least one bridge carrier housing, which is designed and/or adapted to receive a transmission. The axle particularly preferably has exactly two of the bridge carrier housings, wherein the two bridge carrier housings are preferably part of the rigid axle. The rigid bridge is preferably constructed in multiple parts. The two bridge housings can in principle be connected to one another in a form-fitting and/or force-fitting manner, so that a rigid bridge is formed. The axle preferably has a transmission housing, wherein two bridge housings are arranged on both sides and/or fastened to the transmission housing, thus forming a rigid axle. The two bridge housing bodies are connected to the bridge transmission housing, in particular in a form-locking and/or force-locking manner. The axle gear housing is preferably used to accommodate a further gear, wherein the further gear is preferably designed as a differential. The bridge transmission housing can optionally be closed on both sides by cover elements, wherein the cover elements are each arranged between one of the bridge carrier housings and the bridge transmission housing.

The bridge girder housing is preferably designed as a rigid and/or hollow bridge, wherein the bridge girder housing is fastened on the work machine side. The transmission is used in particular for transmitting and/or distributing the drive torque and/or for decelerating and/or accelerating the drive torque to the vehicle wheels. The gear is preferably designed as a planetary gear. The transmission is preferably arranged in the bridge housing.

The bridge frame housing has a support section. The support section is in particular designed as a hollow cylindrical projection. The support section is configured to be open on the end side, thus forming an inlet into or an outlet from the bridge housing.

The axle has at least one drive housing for receiving the transmission. The axle has in particular two drive cassettes, wherein each drive cassette is mounted on a respective axle frame housing. The drive housing is preferably designed as a wheel housing and/or a chain housing. At least one, preferably exactly two wheel carriers for accommodating the wheels are preferably arranged on the drive housing. The transmission device is particularly preferably used to transmit the drive torque of the transmission device to two wheels. The transmission device is preferably designed as a traction means drive, in particular as a chain drive. The axle has an overall width of in particular less than 2300 mm.

The drive housing has a coupling section, wherein the coupling section and the support section are arranged coaxially with reference to the axis of rotation. The coupling section is in particular secured against relative rotation on the drive housing. The coupling section is preferably arranged centrally between the two wheel carriers on opposite sides of the drive housing. The drive housing preferably has a coupling opening which is arranged coaxially and/or concentrically with respect to the main axis of rotation, wherein the coupling section preferably extends the coupling opening in the axial direction with respect to the main axis of rotation. The coupling section is in particular designed as a separate component, preferably as a bridge pipe. The coupling section is preferably connected to the drive housing in a force-fitting and/or form-fitting and/or material-fitting manner.

The coupling section and the support section are arranged coaxially with reference to the main axis of rotation, wherein the support section extends at least partially within the coupling section. The coupling section has in particular a larger diameter than the support section. The inner diameter of the coupling section is preferably larger than the outer diameter of the support section. The support section extends in the axial direction with reference to the main axis of rotation, in particular completely within the coupling section.

The axle has a first bearing assembly. The first bearing assembly serves in particular to rotatably support the drive box relative to the bridge housing. The first bearing assembly is preferably used for axially and/or radially supporting the drive housing, in particular the coupling section. The pivot mounting is realized in particular by a first bearing assembly, wherein the drive box can be pivoted about the main axis of rotation, in particular during travel operation of the work machine.

The first bearing assembly is supported on the one hand on the support section and on the other hand on the coupling section. The first bearing assembly is arranged in particular with reference to the main axis of rotation in the radial direction between the support section and the coupling section. The first bearing assembly is preferably supported on the outer circumference of the support section and on the other hand on the inner circumference of the coupling section. The first bearing assembly is particularly preferably arranged coaxially with the main axis of rotation.

Within the framework of the invention, it is proposed that the first bearing assembly has an inner bearing device and an outer bearing device. The two bearing devices are preferably used to support and/or fix the coupling section in the radial and/or axial direction with reference to a stationary support section. The inner bearing device and/or the outer bearing device are in particular designed as a thrust bearing and/or as a radial bearing. The outer bearing device is preferably arranged on the outer end of the support section in the axial direction with reference to the main axis of rotation. The inner bearing device is preferably arranged offset from the outer bearing device in the axial direction inwardly in the direction of the bridge housing with reference to the main axis of rotation.

The two bearing devices are spaced apart from each other in the axial direction with reference to the main axis of rotation. In particular, the outer bearing device is arranged on the end side in the region of the outer third of the support section and/or the inner bearing device is arranged in the region of the inner third of the support section. The coupling section is preferably supported on the support section by means of two bearing devices, so that the load transmission between the drive box and the bridge housing is effected by means of two bearing devices. The coupling section is supported, in particular for the most part or completely over its entire axial structural length, on the support section by means of two bearing devices. In principle, a fixed bearing and/or a floating bearing can be realized by means of two bearing arrangements. The coupling section is preferably arranged on the support section in a tensioned manner by means of two bearing devices, so that the coupling section is fixed in the axial direction with reference to the main axis of rotation.

The advantage of the invention is that a particularly stable and secure support of the drive housing is achieved by means of the two bearing arrangements, whereby the operating characteristics and/or the service life of the first bearing assembly are significantly improved. The bearing seat or the overall width of the axle can also be significantly reduced by arranging two bearing devices between the coupling section and the support section. A particularly compact and space-saving axle is thus achieved, wherein the transport of the axle can be carried out, for example, in a freight container or a shipping container.

In a preferred embodiment of the invention, the inner bearing device and/or the outer bearing device is designed as a rolling bearing. The rolling bearing is in particular designed as a roller bearing or a ball bearing. It is particularly preferred that the rolling bearing is designed as a tapered roller bearing. The fixed (angelett) bearing arrangement is preferably realized by two bearing devices in the form of tapered roller bearings, wherein the two bearing devices are arranged opposite one another in mirror-image symmetry. It is particularly preferred that the two bearing devices are arranged in a so-called O-shape, wherein the pressure midpoint of the two bearing devices is located outside the bearing location. The two bearing arrangements can thus withstand a greater overturning moment, thus improving the support of the drive housing. By using two standard bearings as the two bearing devices, a particularly cost-effective mounting is also achieved.

In an alternative or an optionally supplementary embodiment, the inner bearing device and/or the outer bearing device is/are designed as a plain bearing. The inner and/or outer bearing means are in particular formed by bushings. The plain bearing is realized in particular by solid friction, wherein the inner bearing device and/or the outer bearing device is preferably made of a self-lubricating material. Alternatively or additionally, the plain bearing is realized by hybrid friction or liquid friction, wherein the inner bearing device and/or the outer bearing device preferably comprise a lubricant.

In a further embodiment of the invention, it is provided that the axle has a second bearing assembly for supporting the drive shaft. The second bearing assembly is particularly useful for rotatably supporting the drive shaft relative to the bridge housing. The second bearing assembly is preferably used to support the drive shaft in the axial direction and/or in the radial direction. The shaft support is realized in particular by a second bearing assembly, wherein the drive shaft is preferably rotated about the main axis of rotation during the travel operation of the work machine. The drive shaft particularly preferably defines a main axis of rotation with its axis of rotation.

The drive shaft connects in particular a transmission and a transmission, wherein the drive torque is transmitted from the transmission via the drive shaft to the transmission. The drive shaft preferably ends on the one hand in the drive housing, wherein the drive wheel is preferably connected to the drive shaft on the end side in a rotationally fixed manner. The drive shaft is in particular designed as a sprocket shaft, wherein the drive wheel is preferably designed as a sprocket. On the other hand, the drive shaft can be connected to the transmission in a transmission-related manner. The drive shaft is connected in particular in a rotationally fixed manner to a planet carrier of a gear unit in the form of a planetary gear.

The second bearing assembly is supported on the inner circumference of the support section. The second bearing assembly is preferably supported on the inner circumference of the support section and on the other hand on the outer circumference of the drive shaft. The second bearing assembly is preferably arranged between the support section and the drive shaft in a radial direction with reference to the main axis of rotation. The second bearing assembly is particularly preferably arranged coaxially with the main axis of rotation.

The second bearing assembly has an additional inner bearing means and an additional outer bearing means. The two further bearing devices are in particular designed as rolling bearings, particularly preferably as tapered roller bearings. The two further bearing devices are preferably arranged at a distance from one another in the axial direction with reference to the main axis of rotation.

The two outer bearing devices and/or the two inner bearing devices are arranged one above the other or at least approximately one above the other in the radial direction with reference to the main axis of rotation. The two outer bearing devices are preferably supported on the support section in a common outer force introduction point and/or the two inner bearing devices are supported on a common inner force introduction point.

By arranging the first bearing assembly above the second bearing assembly, in particular despite the arrangement of the transmission in the bridge housing, the axial structural width of the bridge housing can be significantly reduced. In addition, the loads acting on the transmission and/or the transmission and on the drive box are decoupled from one another. The load acting on the drive housing is preferably introduced directly via the first bearing assembly into the transmission, in particular the drive shaft, directly via the second bearing assembly via the support section in each case. The load decoupling of the two bearing assemblies from one another can significantly improve the service life and/or the noise generation of the axle, in particular of the pivot bearing arrangement and/or of the transmission.

In a specific embodiment, it is provided that an annular chamber is formed between the support section and the coupling section. The annular chamber is preferably delimited in the radial direction with reference to the main axis of rotation by a radially inner side of the coupling section, in particular by a cylindrical inner circumferential flank, on the one hand, and by a radially outer side of the support section, in particular by a cylindrical outer circumferential flank, on the other hand. The annular chamber preferably extends without interruption in the circumferential direction with reference to the main axis of rotation.

A first bearing assembly is disposed in the annular chamber. It is particularly preferred that the inner bearing means and/or the outer bearing means are arranged within the annular chamber. It is particularly preferred if the annular chamber is fluidically connected to the inner chamber of the drive chamber. For this purpose, the annular chamber terminates in the coupling opening of the drive housing in the axial direction with reference to the main axis of rotation. Maintenance costs of the first bearing assembly can thereby be significantly reduced, since the first bearing assembly is designed with a common lubricant budget with the drive housing.

The first bearing assembly has at least one sealing device, wherein the annular chamber is sealed by the sealing device in an axial direction with reference to the main axis of rotation. The annular chamber is sealed by a sealing device, in particular with reference to the main axis of rotation, in the axial direction downstream of the inner bearing device, in particular at the axial ends of the coupling section. The sealing device is preferably designed as a shaft seal, in particular as a radial shaft seal or an axial shaft seal. The sealing means preferably seals the annular chamber from the environment, thus preventing lubricant from coming out of the annular chamber. The sealing device is in particular firmly connected to the coupling section on the one hand and rests with a sealing lip on the support section on the other hand. The sealing lip of the sealing device preferably runs on the outer circumference of the support section when the drive housing is pivoted about the main axis of rotation.

In a specific embodiment of the invention, it is provided that the bearing arrangement has a further sealing device. The further sealing device is preferably designed as a further shaft seal, in particular as a further radial shaft seal or as an axial shaft seal. According to one embodiment of the invention, the first bearing assembly has a further sealing device, wherein the annular chamber is sealed on both sides by the sealing device and the further sealing device in the axial direction with reference to the main axis of rotation.

The annular chamber is sealed on both sides in the axial direction with reference to the main axis of rotation by two sealing means. The further sealing means preferably seals the annular chamber against the drive housing, thereby preventing lubricant from exiting the annular chamber. The annular chamber is preferably filled with a lubricant, in particular with grease or lubricating oil. A lubricant reservoir is thus created by the sealing of both sides of the annular chamber. Furthermore, the bridge housing, in particular together with the coupling section, can be provided as a closed or lubricant-tight structural unit by sealing the annular chamber.

Preferably, at least one sealing gap is formed between the coupling section and the bridge girder housing, wherein the sealing gap prevents coarse dirt from entering the annular chamber. A sealing gap is formed in particular between the axial end face of the coupling section and the adjoining bridge girder housing. The sealing gap preferably extends without interruption in the circumferential direction with reference to the main axis of rotation. It is particularly preferred if the sealing gap is configured as an annular gap. In particular very small particles (kleinspartikel) which penetrate into the annular chamber through the sealing gap during driving operation, for example, can thus be discharged downwards, since the sealing gap is designed to be continuously open, in particular in the radial direction. The sealing gap is less than 5mm, preferably less than 2mm, in particular less than 1mm, in particular at its narrowest point.

In a further embodiment of the invention, an intermediate space is formed between the support section and the coupling section, wherein the intermediate space directly adjoins the annular chamber. The bridge girder housing preferably has a housing section, wherein the support section directly adjoins the housing section. The transmission is preferably accommodated in this housing section. The support section is in particular integrally formed on the housing section, for example from a casting. The intermediate space is delimited in the radial direction, in particular with reference to the main axis of rotation, on the one hand by the bridge housing, in particular the support section and/or the housing section, and on the other hand by the axial ends of the coupling section.

The intermediate space is delimited by the sealing means on the one hand and by the sealing gap on the other hand. During driving operation, an accumulation of very small particles in the intermediate space can occur, wherein the very small particles, in particular moisture, water spray, dust particles, are prevented from penetrating further through the sealing device. The very small particles are preferably guided out of the intermediate space downwards again through the sealing gap caused by gravity. The deposition of very small particles in the intermediate space can thus be reduced or prevented.

In another specific embodiment, it is provided that the bridge housing has a mounting section on the upper side for coupling to a base frame of the work machine. The mounting section is formed on both sides in the axial direction on the housing section with reference to the main axis of rotation. The mounting section particularly preferably has a reinforcing structure, wherein the reinforcing structure reinforces the mounting section in particular with reference to the main axis of rotation in the radial direction. The reinforcing section is preferably formed by a rib structure and/or a carrier structure. The reinforcing structure and the mounting section are connected to the housing section in particular in one piece, preferably made from a common casting. The reinforcing structure is formed by ribs in the 3 o 'clock and 9 o' clock positions, respectively, as seen in the axial direction, with particular reference to the main axis of rotation. The bridge housing can be connected to the chassis in a force-fitting and/or form-fitting manner, in particular via the mounting section.

The support section and the mounting section are identically oriented in the axial direction with reference to the main axis of rotation, wherein the coupling section extends at least partially in the axial direction between the mounting section and the support section. The mounting section preferably extends in a reference plane which runs parallel to the main axis of rotation and at the same time defines a mounting surface of the mounting section. The mounting section is preferably designed as a spring plate, wherein the mounting section is arranged, in particular, floating above the coupling section.

In a specific embodiment, the coupling section has a circumferential rib. The rib preferably extends in the circumferential direction with reference to the main axis of rotation over the outer circumference of the coupling section. The rib preferably extends without interruption in the direction of wrap. The rib is arranged on the coupling section on the end side in the axial direction, in particular with reference to the main axis of rotation. The rib is preferably arranged opposite the sealing device.

A further sealing gap is formed between the rib and the mounting section, wherein the further sealing gap prevents coarse dirt from entering the intermediate space. The rib extends in particular with reference to the main axis of rotation in the radial direction in the direction of the mounting section, wherein a further sealing gap is formed between the radially inner side of the mounting section and the rib section. The sealing gap has a minimum opening cross section at the 12 o ' clock position, in particular with reference to the main axis of rotation, wherein the further sealing gap has a divergent course in the direction of the 3 o ' clock and 9 o ' clock positions. Downward, in particular at the 6 o' clock position, the bridge housing is kept open, so that coarse dirt which accumulates between the mounting section and the coupling section, for example when the coupling section is twisted about the main axis of rotation, can fall out downward. The additional sealing gap particularly preferably has a smaller opening cross section than the sealing gap, wherein the penetration of very small particles through the additional gap is additionally reduced, in particular in the 12 o' clock position. The further sealing gap is in particular designed as a labyrinth gap.

Provision is preferably made for the first bearing assembly to have a spacer means. The spacer means can be configured in particular as a spacer ring or at least one spacer. It is particularly preferred that the spacer members are arranged coaxially with reference to the main axis of rotation. The spacer means is arranged in particular in the annular chamber between the inner bearing means and the sealing means.

The inner bearing device is supported in the axial direction with reference to the main axis of rotation on the bridge housing by means of a spacer element. The spacer means serve in particular to create a flat contact surface for the inner bearing device, preferably for the bearing inner ring of the inner bearing device. The support section is particularly preferably embodied with a radius on its outer circumference in the transition region of the support section and the housing section.

The spacer element preferably forms a contour fit with the bridge housing, preferably with the radius, on the one hand, and has an abutment surface for the inner ring on the other hand. As large a radius as possible, in particular a radius of more than 5mm, preferably more than 10mm, in particular more than 15mm, can thereby be implemented in the transition region, so that component stresses of the bridge girder housing, preferably of the support section, are reduced. While the inner bearing means is provided with a flat abutment surface by the spacer means.

Furthermore, the spacer element serves for the axial support of the inner ring of the inner bearing device during the mounting process, wherein the spacer element is in turn held in the axial direction against falling with reference to the main axis of rotation on the coupling section by the sealing device. The spacer means preferably forms a form-fit with the inner ring of the inner bearing device and the bridge housing in the axial direction with reference to the main axis of rotation. The spacer element is in particular pressed into contact with the bridge girder housing via the inner bearing arrangement in the installed state.

In a further specific embodiment, it is provided that the vehicle axle has a bearing cap, wherein the bearing cap is mounted on an axial end face of the support section. The bearing cap is in particular designed as a separate component, wherein the bearing cap is preferably detachably connected to the support section. The bearing cap is preferably connected to the support section in a form-fitting and/or force-fitting manner, in particular by a screw connection. The bearing cap can preferably be designed as a circular disk, wherein the outer diameter of the bearing cap is greater than the outer diameter of the support section.

The bearing cap fixes the first bearing assembly in an axial direction with reference to the main axis of rotation. The outer bearing device, in particular the outer bearing inner ring, is preferably supported on the bearing cap in the axial direction with reference to the main axis of rotation. The bearing cap has in particular a circumferential rib, wherein the rib serves in particular as a centering aid during the installation of the bearing cap and/or as an extension of the bearing cap in the direction of the outer bearing device.

In a possible embodiment of the invention, the first bearing assembly has an adjusting disk for adjusting the bearing pretension. The adjusting disk can in particular be arranged between the bearing cap and the outer bearing device. The adjusting disk is preferably designed as an annular disk. In particular, the first bearing assembly is adjusted in accordance with the roll torque, in particular by an adjustment disc. The adjusting disk is arranged in particular coaxially with the main axis of rotation. However, the outer bearing device and/or the inner bearing device can alternatively be produced with high precision, so that the bearing preload is generated exclusively by the bearing cap. For this purpose, the outer bearing device and/or the inner bearing device are embodied as so-called "SetRight" (play-free) bearings.

Another subject matter of the invention relates to a self-propelled working machine with an axle as described above. The working machine is constructed in particular as a construction machine or as a forestry machine.

Drawings

The invention is further explained below with the aid of the drawing, in which further advantages, features and effects can be seen from the drawing description. In the drawings:

fig. 1 shows an axle for a self-propelled work machine in three dimensions;

FIG. 2 shows a partial view of the axle in cross-section;

fig. 3 shows the bridge carrier housing of the axle in a three-dimensional view.

Detailed Description

Fig. 1 shows an axle 1 for a self-propelled working machine in three dimensions. The working machine is, for example, constructed as a forestry machine, such as a pallet or harvester, or as a construction machine, such as a grader or the like. The vehicle axle 1 is designed, for example, as a driven rear axle of a work machine.

The vehicle axle 1 has two axle housing shells 2, two drive cassettes 3 and a axle transmission housing 4, wherein the two axle housing shells 2 are connected on both sides to the axle transmission housing 4. The two bridge frame housings 2 can be connected to the bridge transmission housing 4, for example, in a form-fitting and/or force-fitting manner. The two bridge carrier housings 2 and the axle transmission housing 4 together form a rigid axle which connects the two drive cassettes 3 to one another. The vehicle axle 1 is preferably designed as a driven vehicle axle, wherein, for transmitting and/or distributing the drive torque, a differential gear mechanism is arranged, for example, in the axle transmission housing 4.

Two wheel carriers 22 are arranged on each of the two drive boxes 3, each wheel carrier serving to accommodate a wheel, so that the vehicle axle 1 is designed, for example, as a double axle or a tandem axle. The two drive cassettes 3 are each mounted pivotably on one of the bridge housing 2, wherein the two drive cassettes 3 can be pivoted about the main axis of rotation H relative to the bridge housing 2, for example during driving operation of the work machine on uneven ground. The axle 1 has a maximum axial structural length with reference to the main axis of rotation H of less than 2300mm, for example.

The two bridge girder housings 2 each have a housing section 2a and a mounting section 2 b. The two mounting sections 2b are each designed, for example, as floating spring plates and extend in a common plane which simultaneously defines the mounting surfaces of the two mounting sections 2 b. The two mounting sections 2b are, for example, respectively formed and/or cast on the housing section 2a and/or are integrally produced, for example, from a common casting. The bridge housing 2 forms a rigid part of the axle 1 and is firmly connected to the chassis of the work machine. For this purpose, the bridge housing 2 is connected or screwed to the chassis of the work machine on the work machine side via two mounting sections 2 b.

Fig. 2 shows a partial section of the vehicle axle 1 in a sectional view along the main axis of rotation H. The bridge housing 2, in particular the housing section 2a, serves to accommodate a transmission 5 and the drive housing 3 serves to accommodate a transmission 6. The transmission 5 is designed as a planetary gear, wherein the transmission 5 has a sun gear 5a, a plurality of planet gears 5b and a planet carrier 5c for receiving the planet gears 5 b. The gear unit 5 serves, for example, for the reduction and/or acceleration of the drive torque to a drive shaft 7 connected to the planet carrier 5 c. The drive shaft 7 defines a main axis of rotation H, for example with its axis of rotation, and serves to transmit the drive torque from the transmission 5 to the transmission 6.

The drive housing 3 has a coupling opening 3a, wherein the coupling opening 3a is inserted into the drive housing 3 coaxially to the main axis of rotation H. The coupling opening 3a is configured, for example, as a circular cutout, wherein the drive shaft 7 extends in the axial direction along the main axis of rotation H through the coupling opening 3a into the interior 3c of the drive housing 3.

The transmission device 6 is designed, for example, as a traction means transmission, in particular as a chain transmission, wherein the drive shaft 7 for this purpose has a drive wheel 8 at its axial end. The drive wheel 8 is designed as a sprocket wheel, for example, and is connected in a rotationally fixed manner to the drive shaft 7. The transmission device 6 has two traction means 9, wherein one traction means 9 is connected to the drive wheels 8 on the one hand and to one of the two wheel carriers 22 on the other hand, so that the drive torque is transmitted to the two wheel carriers 22 via the two traction means 9.

The drive box 3 is pivotably supported on the bridge frame housing 2 by means of a first bearing assembly 10. For this purpose, the drive housing 3 has a coupling section 3b and the bridge housing 2 has a support section 2c, wherein the coupling section 3b and the support section 2c are arranged coaxially and/or concentrically with respect to the main axis of rotation H. The coupling section 3b is designed as a cylindrical bridge pipe, wherein the coupling section 3b extends the coupling opening 3a axially in the direction of the bridge housing 2 with reference to the main axis of rotation H. The coupling section 3b is, for example, designed as a separate component and is mounted on the drive housing 3 in a force-fitting manner.

The support section 2c is designed as a hollow cylinder, wherein the support section 2c extends the bridge housing 2 in the axial direction in the direction of the drive box 3, preferably in the direction of the coupling opening 3a, with reference to the main axis of rotation H. The support section 2c is connected to the housing section 2a, for example, integrally, for example, by a common casting, or is cast and/or formed on said housing section. The drive shaft 7 extends in the axial direction through the support section 2c with reference to the main axis of rotation H between the transmission and the transmission 5, 6.

The support section 2c in turn extends largely or completely within the coupling section 3b, wherein an annular chamber 11 is formed between the support section 2c and the coupling section 3 b. The annular chamber 11 is delimited in the radial direction with reference to the main axis of rotation H by the outer circumference of the support section 2c on the one hand and the inner circumference of the coupling section 3b on the other hand. The first bearing assembly 10 is arranged within the annular chamber 11, whereby the drive box 3, in particular the coupling section 3b, is supported on the support section 2c by the first bearing assembly 10. The coupling section 3b is thus rotatably supported on the support section 2c by the first bearing assembly 10, so that the drive housing 3 can pivot about the main axis of rotation H.

The vehicle axle 1 has a second bearing assembly 12, wherein the second bearing assembly 12 is configured and/or adapted to support the drive shaft 7. For this purpose, the second bearing assembly 12 bears in the radial direction with reference to the main axis of rotation H on the one hand against the outer circumference of the drive shaft 7 and on the other hand against the inner circumference of the support section 2 c. The drive shaft 7 is thus rotatably supported inside the support section 2c by the second bearing assembly 12.

The first bearing assembly 10 has an inner bearing means 10b and an outer bearing means 10a and the second bearing assembly 12 has a further inner bearing means 12b and a further outer bearing means 12 a. The inner bearing device 10b, the outer bearing device 10a, the further inner bearing device 12b, the further outer bearing device 12a are designed as tapered roller bearings, wherein a stationary supporting bearing arrangement is realized by the inner bearing device 10b and the outer bearing device 10a and the further inner bearing device 12b and the further outer bearing device 12a, respectively. A fixed bearing is thus achieved by the two bearing assemblies 10, 12, respectively, wherein the drive shaft 7 on the one hand and the coupling section 3b on the other hand pass through the respective inner bearing device 10b and outer bearing device 10a in the axial direction with reference to the main axis of rotation H; a further inner bearing device 12b and a further outer bearing device 12a are arranged in tension on the support section 2 c.

The two

inner bearing devices

10b, 12b and the two

outer bearing devices

10a, 12a are arranged one above the other in the radial direction with reference to the main axis of rotation H. By arranging the first bearing assembly 10 above the second bearing assembly 12, a significant saving in axial installation space is achieved, as a result of which the overall axial installation length of the vehicle axle 1 is reduced. The vehicle axle 1 can thus be transported, for example, in a standard container according to ISO standard 668.

Furthermore, the two bearing assemblies 10, 12 are decoupled from one another, wherein the load acting on the first bearing assembly 10 is conducted out into the support section 2c by the first bearing assembly 10. The load acting on the transmission 5 or the transmission 6 is conducted out into the support section 2c via the drive shaft 7 and the second bearing assembly 12. By uncoupling the two bearing assemblies 10, 12, the loads acting on the first bearing assembly 10 do not have any influence on the transmission or transfer means 5, 6 and, conversely, the loads acting on the second bearing assembly 12 do not have any influence on the coupling section 3b, etc., so that the service life of the individual components can be increased and/or the noise generation can be significantly reduced.

The first bearing assembly 10 has a sealing device 13, wherein the annular chamber 11 is sealed in the axial direction with reference to the main axis of rotation H by the sealing device 13 on the one hand and is connected in terms of flow technology to the interior 3c of the drive housing 3 on the other hand. The flow-technical connection of the annular chamber 11 to the interior 3c of the drive chamber 3 can reduce maintenance costs, since the first bearing assembly 10 is designed with a common lubricant budget for the drive chamber 3. Here, the sealing device 13 prevents lubricant from exiting the annular chamber 11 into the surrounding environment. The sealing device 13 is designed, for example, as a radial shaft seal, wherein the sealing device 13 is connected in the radial direction with reference to the main axis of rotation H on the one hand to the coupling section 3c and on the other hand with a sealing lip against the support section 2 c.

Furthermore, the first bearing assembly 10 has a spacer means 14, wherein the inner bearing device 10b is supported in the axial direction on the support section 2c with reference to the main axis of rotation H by the sealing means 14. The support section 2c is embodied in the transition region 15 to the housing section 2a with a radius of, for example, 10mm in order to reduce component stresses. The spacer means 14 has, on the one hand, the same radius as the support section 2c and, on the other hand, a flat contact surface for the inner ring of the inner bearing device 10 b. The spacer means 14 for example form a contour fit with a radius provided on the support section 2 c. The radius can therefore be designed arbitrarily in the transition region 15, wherein a flat contact surface for the inner bearing device 10b is formed by corresponding spacer means.

The spacer means 14 is preferably designed as a spacer ring, wherein the spacer means 14 is arranged coaxially to the main axis of rotation H and bears in the radial direction at least against the inner circumference of the coupling section 3 b. The contact surface is configured, for example, as a torus, which extends in a radial plane, in particular with reference to the main axis of rotation H. Furthermore, the spacer means 14 serve to support the inner ring of the inner bearing device 10b, wherein the spacer means 14 are in turn held by the sealing device 13 in the axial direction with reference to the main axis of rotation H. An anti-falling arrangement of the inner bearing device 10b, the spacer means 14 and the sealing device 13 on the coupling section 3b is thus obtained, for example, during mounting.

The vehicle axle 1 has a bearing cap 16, wherein the bearing cap 16 is mounted on an axial end face of the support section 2 c. The bearing cap 16 serves to fix the first bearing assembly 10 in the axial direction with reference to the main axis of rotation H. The bearing cap 16 is configured, for example, as an annular cap, wherein the inner ring of the outer bearing device 10a is supported on the bearing cap 16 in the axial direction. Furthermore, the first bearing device 10 has an adjusting disk 17 for adjusting the bearing pretensioning, wherein the adjusting disk 17 is arranged in the axial direction with reference to the main axis of rotation H between the bearing cover 16 and the outer bearing device 10 a.

A sealing gap 18 is formed between the coupling section 3b and the bridge housing 2, wherein the sealing gap 18 prevents coarse dirt from entering the annular chamber 11. A sealing gap 18 is formed between the axial end face of the coupling section 3b and the adjoining region of the bridge housing 2. The sealing gap 18 extends without interruption in the circumferential direction with reference to the main axis of rotation H, wherein the sealing gap 18 is configured as an annular gap. The sealing gap 18 has a stable course in the circumferential direction, for example with reference to the main axis of rotation H.

The mounting section 2b and the support section 2c are identically oriented in the axial direction with reference to the main axis of rotation H, wherein the coupling section 3b is at least partially arranged between the mounting section 2b and the support section 2 c. Furthermore, an intermediate space 19 is formed between the bridge housing 2 and the coupling section 3b, wherein the intermediate space 19 is delimited on the one hand by the sealing device 13 and on the other hand by the sealing gap 18.

The coupling section 3b has a circumferential rib 20 on its outer circumference, wherein a further sealing gap 21 is formed between the rib 20 and the mounting section 2 b. The further sealing gap 21 has, in particular with reference to the main axis of rotation H, a minimum opening cross section at the 12 o ' clock position in the axial view and extends divergently in the direction of 9 o ' clock and 3 o ' clock. The opening cross section of the additional sealing gap 21 is smaller than the opening cross section of the surrounding sealing gap 18, for example, so that the penetration of foreign particles, in particular coarse dirt and/or very small particles, into the intermediate space 19 is further reduced, for example.

The additional sealing gap 21 serves, for example, as a prefilter, wherein a maximum sealing effect is thus produced by the additional sealing gap 21, in particular at the 12 o' clock position. Since the bottom side of the bridge girder housing 2 remains open, in particular in the region of the rib 21, coarse dirt and the like which accumulates in front of the rib 21, in particular at the 12 o' clock position, can be transported away downwards when the coupling section 3b is twisted. Furthermore, during the driving operation of the work machine, the ingress of very small particles, such as water sprays, dust, etc., into the intermediate space 19 can occur, wherein further penetration into the annular chamber 11 is reduced by the sealing device 13. These very small particles can be conducted off again through the sealing gap 18, in particular in the 6 o' clock position, so that the deposition of very small particles in the intermediate space is reduced or prevented.

The vehicle axle 1 has at least one cover element 23, wherein the cover element 23 separates and/or seals the axle transmission housing 4 from the axle carrier housing 2. The cover element 23 is designed, for example, as a further bearing cover. The axle transmission housing 4 is delimited on both sides in the axial direction by cover elements 23, for example with reference to the main axis of rotation H.

Fig. 3 shows the bridge girder housing 2 with the coupling section 3b in a three-dimensional representation. The bridge girder housing 2 has a reinforcement structure 2d for reinforcing the installation section 2 b. The reinforcing structure 2d is arranged at the 3 o 'clock position and the 9 o' clock position in the axial view with reference to the main rotation axis H. The reinforcing structure 2d is configured, for example, as a profiled rib structure and serves to transmit forces between the mounting section 2b and the housing section 2 a.

List of reference numerals

1 vehicle bridge

2 bridge frame shell

2a housing segment

2b mounting section

2c supporting section

2d reinforced structure

3 drive box

3a connection opening

3b coupling section

3c inner chamber

4-axle transmission casing

5 Transmission device

5a sun gear

5b planet wheel

5c planetary carrier

6 transfer device

7 drive shaft

8 driving wheel

9 traction device

10 first bearing assembly

10a external bearing device

10b inner bearing device

11 annular chamber

12 second bearing assembly

12a further outer bearing device

12b additional inner bearing device

13 sealing device

14 spacer device

15 transition region

16 bearing cap

17 adjusting plate

18 sealing gap

19 intermediate space

20 rib edge

21 additional sealing gap

22 wheel carrier

23 cover element

H main axis of rotation

Claims

1. Axle (1) for a self-propelled working machine, with:

at least one bridge girder housing (2) for accommodating a transmission (5), wherein the bridge girder housing (2) has a support section (2 c);

at least one drive housing (3) for accommodating a transmission device (6), wherein the drive housing (3) has a coupling section (3b), wherein the coupling section (3b) and the support section (2c) are arranged coaxially with respect to a main axis of rotation (H), and wherein the support section (2c) extends at least partially within the coupling section (3 b);

a first bearing assembly (10), wherein the drive box (3) is rotatably supported on the bridge frame housing (2) by means of the first bearing assembly (10), wherein the first bearing assembly (10) is supported on the one hand on the support section (2c) and on the other hand on the coupling section (3b), characterized in that,

the first bearing assembly (10) has an inner bearing means (10b) and an outer bearing means (10a), wherein the inner bearing means (10b) and the outer bearing means (10a) are spaced apart from each other in an axial direction with reference to a main axis of rotation (H).

2. Axle (1) according to claim 1, wherein the inner bearing means (10b) and/or the outer bearing means (10a) are configured as rolling bearings.

3. Axle (1) according to claim 1, characterized in that the inner bearing means (10b) and/or the outer bearing means (10a) are configured as slide bearings.

4. The vehicle axle (1) according to any of the claims 1 to 3, characterised in that the vehicle axle (1) has a second bearing assembly (12) for bearing the drive shaft (7), wherein the second bearing assembly (12) is supported on the inner circumference of the support section (2 c).

5. Axle (1) according to claim 4, characterized in that the second bearing assembly (12) has a further inner bearing means (12b) and a further outer bearing means (12a), wherein the outer bearing means (10a) and the further outer bearing means (12a) and/or the inner bearing means (10b) and the further inner bearing means (12b) are arranged one above the other in the radial direction with reference to the main axis of rotation (H).

6. The vehicle axle (1) according to any one of claims 1 to 3, characterised in that an annular chamber (11) is formed between the support section (2c) and the coupling section (3b), wherein the first bearing assembly (10) is arranged in the annular chamber (11), wherein the first bearing assembly (10) has at least one sealing device (13), wherein the annular chamber (11) is sealed by the sealing device (13) in the axial direction with reference to the main axis of rotation (H).

7. Axle (1) according to claim 6, wherein the first bearing assembly (10) has a further sealing device, wherein the annular chamber (11) is sealed by the sealing device and the further sealing device on both sides in the axial direction with reference to the main axis of rotation (H).

8. Vehicle axle (1) according to claim 6, wherein at least one sealing gap (18) is formed between the coupling section (3b) and the bridge housing (2), wherein the sealing gap (18) prevents coarse dirt from entering the annular chamber (11).

9. Vehicle axle (1) according to claim 8, wherein an intermediate space (19) is formed between the bridge housing (2) and the coupling section (3b), wherein the intermediate space (19) directly adjoins the annular chamber (11), and wherein the intermediate space (19) is bounded on the one hand by the sealing means (13) and on the other hand by the sealing gap (18).

10. Axle (1) according to claim 9, wherein the axle frame housing (2) has a mounting section (2b) on the upper side for coupling to a base frame of a work machine, wherein the support section (2c) and the mounting section (2b) are identically oriented in the axial direction with reference to the main axis of rotation (H), wherein the coupling section (3b) extends at least partially in the axial direction between the mounting section (2b) and the support section (2 c).

11. Vehicle axle (1) according to claim 10, wherein the coupling section (3b) has a circumferential rib (20), wherein a further sealing gap (21) is formed between the rib (20) and the mounting section (2b), wherein the further sealing gap (21) prevents coarse dirt from entering the intermediate space (19).

12. Axle (1) according to any one of claims 1 to 3, wherein the first bearing assembly (10) has a spacer means (14), wherein the inner bearing device (10b) is supported on the bridge housing (2) in an axial direction with reference to the main axis of rotation (H) by means of the spacer means (14).

13. Axle (1) according to any one of claims 1 to 3, wherein the axle (1) has a bearing cap (16), wherein the bearing cap (16) is mounted on an axial end side of the support section (2c), and wherein the bearing cap (16) fixes the first bearing assembly (10) in the axial direction with reference to a main axis of rotation (H).

14. Axle (1) according to any one of claims 1 to 3, wherein the first bearing assembly (10) has an adjusting disc (17) for adjusting the bearing pretension.

15. Self-propelled working machine, characterized in that it is provided with an axle (1) according to any one of claims 1 to 14.