Drive axle assembly and vehicle

Abstract

The invention provides a drive axle assembly and a vehicle, the drive axle assembly comprises an axle housing, a first mounting structure is arranged on the axle housing, and the first mounting structure is used for connecting a plate spring; the drum brake comprises a brake bottom plate, a brake cylinder and an air cylinder support, the drum brake is connected with the axle housing through the brake bottom plate, the air cylinder support extends in the length direction of the axle housing, the first end of the air cylinder support is connected with the brake bottom plate, the second end of the air cylinder support is connected with the brake cylinder, and the brake cylinder is arranged close to the middle of the axle housing. The intersection of a first projection projected by the brake cylinder to the horizontal plane and a second projection projected by the plate spring to the horizontal plane is empty; the second end of the air cylinder support is connected with the axle housing. According to the scheme, by lengthening the air cylinder support, changing the fixing mode of the air cylinder support and adjusting the installation position of the brake air cylinder, the technical problem that the brake cylinder easily interferes with the plate spring is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a drive axle assembly and a vehicle. BACKGROUND

[0002] The commercial vehicle drive axle generally adopts drum brake, and the cylinder support of the drum brake is fixed in a cantilever form on the brake base. In use, two main defects are exposed: on the one hand, the cylinder support is prone to fatigue load due to the brake torque and the weight of the brake cylinder itself, thereby causing fatigue damage or even fracture of the support material, and seriously affecting the stability and safety of the brake system; on the other hand, due to the limitation of the design length of the cylinder support, the center distance of the brake cylinders of the left and right brakes is too large, which is prone to interference with the leaf spring of the vehicle, increasing the difficulty of arrangement of the brake.

[0003] For the technical problem that the brake cylinder of the drum brake is prone to interference with the leaf spring in the prior art, no effective solution has been proposed so far. SUMMARY

[0004] The main purpose of the present application is to provide a drive axle assembly and a vehicle to solve the technical problem that the brake cylinder of the drum brake is prone to interference with the leaf spring in the prior art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a drive axle assembly is provided, comprising: an axle housing, the axle housing is provided with a first mounting structure, the first mounting structure is used for connecting a leaf spring; a drum brake, the drum brake comprises a brake base, a brake cylinder and a cylinder support, the drum brake is connected with the axle housing through the brake base, the cylinder support is arranged along the length direction of the axle housing, the first end of the cylinder support is connected with the brake base, the second end of the cylinder support is connected with the brake cylinder, the brake cylinder is arranged close to the middle part of the axle housing, the intersection of the first projection of the brake cylinder projected to the horizontal plane and the second projection of the leaf spring projected to the horizontal plane is empty; wherein the second end of the cylinder support is connected with the axle housing.

[0006] Further, the first end of the cylinder support is provided with a second mounting structure, the second mounting structure is connected with the brake base, the second end of the cylinder support is provided with a third mounting structure, the third mounting structure is connected with the axle housing, and an installation gap is reserved between the third mounting structure and the axle housing.

[0007] Further, the third mounting structure is provided with a first connecting hole, the axle housing is provided with a first threaded hole corresponding to the first connecting hole, the third mounting structure is connected with the axle housing through a first bolt, the first bolt passes through the first connecting hole and extends into the first threaded hole, and the first bolt is screwed with the axle housing.

[0008] Further, the third mounting structure and the axle housing are provided with an adjusting pad, the adjusting pad is provided with an avoiding hole corresponding to the first connecting hole, the first bolt extends into the first threaded hole through the avoiding hole, and the installation gap is adjusted by replacing the adjusting pad with different thickness.

[0009] Further, the adjusting pad is made of elastic material.

[0010] Further, the diameter of the first connecting hole is greater than the diameter of the first threaded hole.

[0011] Further, the difference between the diameter of the first connecting hole and the diameter of the first threaded hole is greater than 2 mm.

[0012] Further, the second end of the cylinder support is provided with a fourth mounting structure, the fourth mounting structure is located between the second mounting structure and the third mounting structure, the fourth mounting structure is arranged close to the third mounting structure, and the brake cylinder is connected with the fourth mounting structure.

[0013] Further, the fourth mounting structure is arranged along the front-rear direction of the axle housing.

[0014] According to another aspect of the present application, a vehicle is provided, which comprises the drive axle assembly.

[0015] According to the technical scheme of the present application, the first end of the cylinder support is connected with the brake bottom plate, the second end of the cylinder support is connected with the brake cylinder, the cylinder support is lengthened, the brake cylinder is close to the middle part of the axle housing, the intersection of the first projection of the brake cylinder projected to the horizontal plane and the second projection of the leaf spring projected to the horizontal plane is empty, that is, there is no interference between the brake cylinder and the leaf spring in the vertical direction, the two ends of the cylinder support are connected with the axle housing, that is, the two ends of the cylinder support are fixed support points, the rigidity of the cylinder support is improved, and fatigue damage of the cylinder support caused by the brake force torque and the weight of the brake cylinder is avoided. In the above scheme, the technical problem that the brake cylinder is easy to interfere with the leaf spring is solved by lengthening the cylinder support, changing the fixing mode of the cylinder support, and adjusting the installation position of the brake cylinder. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the present application, and together with the description of the application, explain the application. The embodiments of the present application and its description are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 A schematic view of a drive axle assembly in the prior art is shown;

[0018] Figure 2 A schematic view of a drive axle assembly in the present application is shown;

[0019] Figure 3 A schematic view of a drum brake in the present application is shown;

[0020] Figure 4 The connection structure between the cylinder support and the axle housing is shown in the drawings.

[0021] The above drawings include the following reference signs:

[0022] 10, axle housing;

[0023] 11, fifth mounting structure; 111, first threaded hole;

[0024] 20, drum brake;

[0025] 21, brake bottom plate;

[0026] 22, brake cylinder;

[0027] 23, cylinder support; 231, second mounting structure; 232, third mounting structure; 2321, first connecting hole; 233, fourth mounting structure;

[0028] 24, adjusting pad;

[0029] 25, first bolt;

[0030] 30, leaf spring. DETAILED DESCRIPTION

[0031] It should be noted that the embodiments and features in the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0032] It should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that the terms "comprise" and / or "include" as used in the specification indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0033] It is to be understood that the terms "first", "second", and the like, used in the description and the claims of the present application as well as the above description of the drawings merely refer to the structure described above, but do not necessitate or imply any actual limiting of the components described by the structure, and the relative use of such terms is intended to distinguish one component from another component of the same type. It should be understood that the use of the terms so used herein is merely intended to distinguish the particular embodiment for convenience and the use of such terms is in no way meant to limit the scope of various embodiments described herein. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. In this document, the terms "comprises", "comprising", "includes", "including" and the like can be used in reference to particular structures or claims thereof. Thus, for example, when a composition, method, process or apparatus comprises a list of elements, the article "comprises" means that at least the listed elements are present in the composition, method, process or apparatus, but does not necessarily exclude other elements of either the same or different type. In other words, reference to a composition, method, process or apparatus that "comprises" elements means that the composition, method, process or apparatus can further include other

[0034] Reference will now be made in detail to the exemplary embodiments of the present application, which are illustrated in the accompanying drawings. However, these exemplary embodiments can be implemented in various different forms and should not be construed as being limited to only the embodiments set forth herein. It should be understood that the embodiments are provided merely to make the present disclosure complete and to fully convey the concept of the exemplary embodiments to those having ordinary skill in the art, and the drawings are possibly exaggerated in thickness of layers and regions and the like for clarity, and the same reference numerals are used throughout the drawings to designate the same elements, and thus a description thereof will be omitted.

[0035] In the prior art, the cylinder bracket 23 of the drum brake 20 is a cantilever structure, in order to avoid large deformation of the cylinder bracket 23 due to the braking torque and the weight of the brake cylinder 22, as shown in Figure 1 The length of the cylinder bracket 23 is short, that is, when the leaf spring 30 is deformed downward, the leaf spring 30 is prone to collide with the brake cylinder 22.

[0036] In order to solve the technical problem that the leaf spring 30 is prone to collide with the brake cylinder 22, the fixing mode of the cylinder bracket 23 and the position of the brake cylinder 22 are adjusted, and the specific adjustment is as follows.

[0037] In combination with Figures 2 to 4 According to a specific embodiment of the present application, a drive axle assembly is provided.

[0038] Specifically, the drive axle assembly comprises an axle housing 10 and a drum brake 20. The axle housing 10 is provided with a first mounting structure for connecting a leaf spring 30. The drum brake 20 comprises a brake backing plate 21, a brake cylinder 22 and a cylinder support 23. The drum brake 20 is connected to the axle housing 10 through the brake backing plate 21. The cylinder support 23 extends along the length direction of the axle housing 10. The first end of the cylinder support 23 is connected to the brake backing plate 21. The second end of the cylinder support 23 is connected to the brake cylinder 22. The brake cylinder 22 is arranged close to the middle part of the axle housing 10. The intersection of the first projection of the brake cylinder 22 to the horizontal plane and the second projection of the leaf spring 30 to the horizontal plane is empty.

[0039] In the embodiment of the present application, the first end of the cylinder support 23 is connected to the brake backing plate 21. The second end of the cylinder support 23 is connected to the brake cylinder 22. By lengthening the cylinder support 23, the brake cylinder 22 is arranged close to the middle part of the axle housing 10. Thus, the intersection of the first projection of the brake cylinder 22 to the horizontal plane and the second projection of the leaf spring 30 to the horizontal plane is empty. That is, there is no interference between the brake cylinder 22 and the leaf spring 30 in the vertical direction. The second end of the cylinder support 23 is connected to the axle housing 10. That is, both ends of the cylinder support 23 are fixed support points. The rigidity of the cylinder support 23 is improved to avoid fatigue damage of the cylinder support 23 caused by brake force torque and the weight of the brake cylinder 22. In the above scheme, by lengthening the cylinder support 23, changing the fixing mode of the cylinder support 23 and adjusting the installation position of the brake cylinder, the technical problem that the brake cylinder 22 is easy to interfere with the leaf spring 30 is solved.

[0040] Exemplarily, the axle housing 10 is arranged along the width direction of the vehicle. The bottom of the vehicle frame is provided with two leaf springs 30. The two leaf springs 30 are arranged in the width direction of the vehicle frame and are spaced apart. One end of the leaf spring 30 is connected to the vehicle frame. The other end of the leaf spring 30 is connected to the axle housing 10 through the first mounting structure. The first mounting structure can be a plate structure or a hoop structure. The left and right ends of the axle housing 10 are both connected to the drum brake 20. The drum brake 20 is sleeved on the end part of the axle housing 10. The axle housing 10 is connected to the brake backing plate 21 through the flange plate at the end part. The cylinder support 23 extends along the length direction of the axle housing 10. The first end of the cylinder support 23 is connected to the brake backing plate 21. The second end of the cylinder support 23 is connected to the axle housing 10. The second end of the cylinder support 23 is connected to the brake cylinder 22. The brake cylinder 22 is arranged close to the middle part of the axle housing 10. The brake cylinder 22 is arranged away from the first mounting structure. Thus, the intersection of the first projection of the brake cylinder 22 to the horizontal plane and the second projection of the leaf spring 30 to the horizontal plane is empty. That is, the brake cylinder 22 does not collide with the leaf spring 30 during the deformation of the leaf spring 30.

[0041] Further, the first end of the cylinder support 23 is provided with a second mounting structure 231 connected with the brake bottom plate 21, and the second end of the cylinder support 23 is provided with a third mounting structure 232 connected with the axle housing 10, and an installation gap is reserved between the third mounting structure 232 and the axle housing 10.

[0042] In the embodiment of the present application, when the cylinder support 23 is installed with the axle housing 10, the installation gap between the third mounting structure 232 and the axle housing 10 gives the cylinder support 23 a certain amount of activity, which takes into account the material deformation, structural deformation and machining tolerance of the cylinder support 23, so as to avoid interference or too close fitting between the third mounting structure 232 and the axle housing 10 due to deformation and machining tolerance, thereby causing installation difficulty. The first end of the cylinder support 23 is fixedly connected with the brake bottom plate 21, i.e. six degrees of freedom of the cylinder support 23 are limited, and the second end of the cylinder support 23 is further connected with the axle housing 10, which is equivalent to repeatedly limiting the degrees of freedom of the cylinder support 23, thereby causing over-positioning of the cylinder. Under the action of the brake force and over-positioning, a large local stress will be generated near the connecting point of the cylinder support 23. The installation gap is set to allow the cylinder support 23 to have a small displacement relative to the axle housing 10, thereby dispersing the local stress and avoiding large deformation or fracture of the connecting point region of the cylinder support 23.

[0043] As shown in Figure 3 , Figure 4 , the cylinder support 23 is a tubular structure, the first end of the cylinder support 23 is provided with a second mounting structure 231 which is a plate structure, the second mounting structure 231 is sleeved on the first end of the cylinder support 23, and the second mounting structure 231 is fixedly connected with the brake bottom plate 21 by a second bolt. The second end of the cylinder support 23 is provided with a third mounting structure 232 which is a plate structure, the third mounting structure 232 is sleeved on the second end of the cylinder support 23, the axle housing 10 is provided with a fifth mounting structure 11 which is a plate structure formed on the axle housing 10, and an installation gap is reserved between the third mounting structure 232 and the fifth mounting structure 11, so that the third mounting structure 232 can have a small displacement relative to the fifth mounting structure 11.

[0044] Specifically, the third mounting structure 232 is provided with a first connecting hole 2321, the axle housing 10 is provided with a first threaded hole 111 corresponding to the first connecting hole 2321, the third mounting structure 232 is connected with the axle housing 10 by a first bolt 25, and the first bolt 25 passes through the first connecting hole 2321 and extends into the first threaded hole 111 to be screwed with the axle housing 10.

[0045] In the embodiment of the present application, the third mounting structure 232 is screwed with the axle housing 10, which is not only simple in structure and easy to operate, but also can adjust the mounting gap between the third mounting structure 232 and the axle housing 10 by adjusting the position of the first bolt 25.

[0046] As shown in Figure 4 , the fifth mounting structure 11 is formed on the axle housing 10, and the third mounting structure 232 and the fifth mounting structure 11 are both plate-shaped structures, and the third mounting structure 232 is connected with the fifth mounting structure 11. The third mounting structure 232 is provided with a first connecting hole 2321, which is a through hole, and the fifth mounting structure 11 is a threaded hole, and the first bolt 25 passes through the first connecting hole 2321 and the threaded hole in sequence to realize the connection between the cylinder support 23 and the axle housing 10. The third mounting structure 232 and the fifth mounting structure 11 are provided with a mounting gap, so that the third mounting structure 232 can move relative to the first bolt 25 to buffer stress. Among them, by adjusting the relative position of the first bolt 25 and the fifth mounting structure 11, the mounting gap between the third mounting structure 232 and the fifth mounting structure 11 is adjusted.

[0047] In other embodiments, the third mounting structure 232 and the axle housing 10 can be connected by a pin shaft, specifically, the pin shaft passes through the third mounting structure 232 and the fifth mounting structure 11 on the axle housing 10 in sequence, and the free end of the pin shaft is locked by a split pin.

[0048] Further, as shown in Figure 4 , the third mounting structure 232 and the axle housing 10 are provided with an adjusting pad 24, and the adjusting pad 24 is provided with a avoiding hole corresponding to the first connecting hole 2321, and the first bolt 25 extends into the first threaded hole 111 through the avoiding hole, and the mounting gap is adjusted by replacing the adjusting pad 24 with different thickness.

[0049] In the embodiment of the present application, the adjusting pad 24 is arranged between the third mounting structure 232 and the axle housing 10, and the mounting gap is adjusted by replacing the adjusting pad 24 with different thickness, which can not only avoid the stress deformation of the cylinder support 23 due to over positioning, but also avoid the instability of the connection between the cylinder support 23 and the axle housing 10 due to the too large gap.

[0050] Preferably, the adjusting pad 24 is made of elastic material.

[0051] In the embodiment of the present application, the adjusting pad 24 is made of elastic material, and the third mounting structure 232 can abut against the fifth mounting structure 11 on the axle housing 10 through the adjusting pad 24, and the stress on the cylinder support 23 can be buffered through the elastic deformation of the adjusting pad 24, thereby avoiding the damage of the cylinder support 23 due to stress.

[0052] Further, the first connecting hole 2321 has a larger hole diameter than the first threaded hole 111.

[0053] In the embodiment of the present application, the first connecting hole 2321 has a larger hole diameter than the first threaded hole 111, and during braking, the cylinder bracket 23 can move on the mounting surface perpendicular to the axis of the first bolt 25 and rotate around the first bolt 25, further relieving the stress at the connecting point of the cylinder bracket 23, thereby avoiding large deformation or fracture of the connecting point area of the cylinder bracket 23, that is, further improving the stress concentration problem caused by the positioning of the cylinder bracket 23.

[0054] Preferably, the difference between the diameter of the first connecting hole 2321 and the diameter of the first threaded hole 111 is greater than 2mm.

[0055] Further, the second end of the cylinder bracket 23 is provided with a fourth mounting structure 233, the fourth mounting structure 233 is located between the second mounting structure 231 and the third mounting structure 232, the fourth mounting structure 233 is arranged close to the third mounting structure 232, and the brake cylinder 22 is connected with the fourth mounting structure 233.

[0056] In the embodiment of the present application, the fourth mounting structure 233 is arranged close to the third mounting structure 232, that is, while avoiding interference between the brake cylinder 22 and the leaf spring 30, the length of the cylinder bracket 23 is shortened as much as possible to improve the rigidity of the cylinder bracket 23.

[0057] Further, the fourth mounting structure 233 is arranged extending along the front-rear direction of the axle housing 10.

[0058] In the embodiment of the present application, the fourth mounting structure 233 extends along the front-rear direction of the axle housing 10, that is, the rigidity of the cylinder bracket 23 in the longitudinal direction (the forward direction of the vehicle) is enhanced, so that the cylinder bracket 23 can better resist bending and twisting in the longitudinal direction.

[0059] According to another specific embodiment of the present application, a vehicle is provided, which comprises the drive axle assembly in the above-described embodiments.

[0060] From the above description, it can be seen that the above-described embodiments of the present application achieve the following technical effects:

[0061] 1) By lengthening the cylinder bracket 23, the brake cylinder 22 is arranged close to the middle of the axle housing 10, so that the intersection of the first projection of the brake cylinder 22 towards the horizontal plane and the second projection of the leaf spring 30 towards the horizontal plane is empty, thereby solving the problem that the leaf spring 30 is easily interfered with the brake cylinder 22 due to deformation in the vertical direction.

[0062] 2) The first end of the cylinder support 23 is connected with the brake bottom plate 21, and the second end of the cylinder support 23 is connected with the axle housing 10. The brake cylinder 22 is arranged at the second end of the cylinder support 23, that is, both ends of the cylinder support 23 are fixed support points, so that the rigidity of the cylinder support 23 is improved to avoid fatigue damage of the cylinder support 23 caused by the brake force torque and the weight of the brake cylinder 22.

[0063] 3) An installation gap is arranged between the third mounting structure 232 at the second end of the cylinder support 23 and the axle housing 10 to disperse the local stress of the cylinder support 23 caused by over-positioning.

[0064] 4) The hole diameter of the first connecting hole 2321 on the third mounting structure 232 is larger than the hole diameter of the first threaded hole 111 on the axle housing, so that the cylinder support can move on the installation surface perpendicular to the first bolt 25 axis, and the local stress of the cylinder support caused by over-positioning is further dispersed.

[0065] For the convenience of description, spatial relative terms such as "above", "upper", "upper surface", "upper", etc. can be used herein to describe the spatial positional relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "above" other devices or structures will be positioned "below" or "below" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0066] In addition to the above, it should also be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in the specification refer to the specific features, structures or characteristics described in conjunction with the embodiment, which are included in at least one embodiment described in the general description of the application. The same expression appears in several places in the specification does not necessarily refer to the same embodiment. Further, when a specific feature, structure or characteristic is described in conjunction with any embodiment, it is claimed that the implementation of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present application.

[0067] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0068] The above merely provides the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A drive axle assembly characterized by, The application relates to a drum brake (20) and a bridge housing (10) for a vehicle. The drum brake (20) comprises a brake bottom plate (21), a brake cylinder (22) and a cylinder support (23), the drum brake (20) is connected with the bridge housing (10) through the brake bottom plate (21), the cylinder support (23) is arranged along the length direction of the bridge housing (10), the first end of the cylinder support (23) is connected with the brake bottom plate (21), the second end of the cylinder support (23) is connected with the brake cylinder (22), the brake cylinder (22) is arranged close to the middle part of the bridge housing (10), the intersection of the first projection of the brake cylinder (22) projected to the horizontal plane and the second projection of the leaf spring (30) projected to the horizontal plane is empty. The second end of the cylinder support (23) is connected with the bridge housing (10). The first end of the cylinder support (23) is provided with a second mounting structure (231), the second mounting structure (231) is connected with the brake bottom plate (21), the second end of the cylinder support (23) is provided with a third mounting structure (232), the third mounting structure (232) is connected with the bridge housing (10), and an installation gap is reserved between the third mounting structure (232) and the bridge housing (10).

2. The drive axle assembly of claim 1, wherein, The third mounting structure (232) is provided with a first connecting hole (2321), the bridge housing (10) is provided with a first threaded hole (111) corresponding to the first connecting hole (2321), the third mounting structure (232) is connected with the bridge housing (10) through a first bolt (25), the first bolt (25) passes through the first connecting hole (2321) and extends into the first threaded hole (111) and is screwed with the bridge housing (10).

3. The drive axle assembly of claim 2, wherein, An adjusting pad (24) is arranged between the third mounting structure (232) and the bridge housing (10), the adjusting pad (24) is provided with an avoiding hole corresponding to the first connecting hole (2321), the first bolt (25) extends into the first threaded hole (111) through the avoiding hole, and the installation gap is adjusted by replacing the adjusting pad (24) with different thicknesses.

4. The drive axle assembly of claim 3, wherein, The adjusting pad (24) is made of elastic material.

5. The drive axle assembly of claim 4, wherein, The diameter of the first connecting hole (2321) is larger than the diameter of the first threaded hole (111).

6. The drive axle assembly of claim 3, wherein, The difference between the diameter of the first connecting hole (2321) and the diameter of the first threaded hole (111) is greater than 2 mm.

7. The drive axle assembly of claim 6, wherein, The second end of the cylinder support (23) is provided with a fourth mounting structure (233), the fourth mounting structure (233) is located between the second mounting structure (231) and the third mounting structure (232), the fourth mounting structure (233) is arranged close to the third mounting structure (232), and the brake cylinder (22) is connected with the fourth mounting structure (233).

8. The drive axle assembly of claim 2, wherein, The fourth mounting structure (233) is arranged along the front-rear direction of the bridge housing (10).

9. The drive axle assembly of claim 8, wherein, ​ 10. A vehicle characterized by comprising: The vehicle comprises the drive axle assembly according to any one of claims 1 to 9.

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