Adjustable rear axle assembly tool

Abstract

The utility model belongs to the technical field of assembling devices, and particularly relates to an adjustable rear axle assembling tool which comprises a main frame, a bearing support and a positioning support. The two bearing supports are arranged on the main frame in a spaced mode, and the positioning support is located between the two bearing supports. The bearing support comprises a bearing assembly and an adjusting assembly which are sequentially arranged from top to bottom. The bearing assembly is used for supporting the rear axle. The adjusting assembly is used for adjusting the position of the bearing assembly on the main frame in the length direction of the main frame. The positioning support comprises a supporting assembly and a positioning assembly which are sequentially arranged from top to bottom. The supporting assembly is used for supporting the rear axle motor. The positioning assembly is used for adjusting the position of the supporting assembly on the main frame in the length direction of the main frame. The scheme is high in universality, efficient in assembly and high in precision.

Description

Technical Field

[0001] This utility model belongs to the field of assembly device technology, specifically relating to an adjustable rear axle assembly fixture. Background Technology

[0002] In vehicle structure, the rear axle, as a crucial component of the power transmission system, typically consists of two half-axles, enabling differential movement between them. Simultaneously, the rear axle also supports the wheels, connects the rear wheels, and transmits driving torque. During bus assembly, the positioning and installation accuracy of the rear axle directly impacts the overall vehicle's power performance, driving stability, and assembly quality.

[0003] Currently, in the assembly process of bus rear axles, a lifting trolley is commonly used as an auxiliary tool for lifting and positioning the rear axle. The specific operation is as follows: the two ends of the rear axle's equalizing beam are placed on the lifting trolley's load-bearing beam as load-bearing surfaces, and the angular direction of the rear axle is positioned by the positioning blocks set on the lifting trolley. Then, the entire rear axle is moved to the installation position of the vehicle frame to complete the assembly operation.

[0004] However, the lifting trolleys used in the prior art have the following shortcomings:

[0005] First, it has poor versatility. Because the load-bearing beams and positioning structures of the lifting trolley are mostly fixed welded, they are only suitable for specific structures or models of rear axles, making it difficult to adapt to the assembly requirements of various specifications of rear axles. This results in large amounts of redundant investment in equipment and low resource utilization.

[0006] Secondly, the assembly precision is not high. The angle positioning device of the lifting trolley is a fixed welded structure, which has a large manufacturing error and cannot be fine-tuned according to actual assembly requirements. This can easily cause problems such as poor fit of the assembly surfaces between the rear axle and the frame, inconsistent bolt hole positions, and thus affect the overall vehicle assembly quality.

[0007] Secondly, assembly efficiency is low. For some rear axles that have deviations due to manufacturing errors, manual adjustment is required using auxiliary tools such as pry bars and lifting tools, which increases the labor intensity of assembly, prolongs the assembly time, and reduces assembly efficiency.

[0008] In summary, the existing lifting trolleys used for rear axle assembly still have many limitations in structural design, making it difficult to meet the requirements of modern bus rear axle assembly for strong versatility, high efficiency, and high precision. Utility Model Content

[0009] To address the aforementioned technical problems, this utility model provides an adjustable rear axle assembly fixture to solve the issues of poor versatility, low assembly precision, and low assembly efficiency in existing bus rear axle assembly.

[0010] The technical solution adopted by this utility model is as follows: an adjustable rear axle assembly fixture, including a main frame, a load-bearing bracket and a positioning bracket;

[0011] Two load-bearing supports are provided and are spaced apart on the main frame, and the positioning support is located between the two load-bearing supports.

[0012] The load-bearing bracket includes a load-bearing component and an adjustment component arranged sequentially from top to bottom;

[0013] The load-bearing component is used to support the rear axle; the adjustment component is used to adjust the position of the load-bearing component on the main frame along the length of the main frame.

[0014] The positioning bracket includes a support component and a positioning component arranged sequentially from top to bottom;

[0015] The support component is used to support the rear axle motor; the positioning component is used to adjust the position of the support component on the main frame along the length of the main frame.

[0016] Furthermore, the main frame includes columns, two support frames, and a trolley connector;

[0017] The two support frames are spaced apart from top to bottom. The support frame has a rectangular frame structure and includes two longitudinal beams and two transverse beams. The two longitudinal beams are fixedly connected by the transverse beams.

[0018] The two support frames are fixedly connected by columns;

[0019] The trolley connector is located on the lower support frame and is used to detachably connect the main frame to the lifting trolley.

[0020] Furthermore, the load-bearing component includes a load-bearing frame, an arc-shaped load-bearing plate, and a pad.

[0021] The arc-shaped load-bearing plate and the pad are fixedly connected to the top and bottom of the load-bearing frame, respectively.

[0022] The arc-shaped load-bearing plate is used to support the brake disc protective housing of the rear axle;

[0023] The pad is detachably connected to the adjustment assembly, and the pad is used to abut against the top of the upper longitudinal beam.

[0024] Furthermore, the adjustment assembly includes a first L-shaped bending plate, a connecting plate, a connecting frame, a first detachable connector, an adjusting bolt, an adjusting nut, and a first tightening rod;

[0025] There are two first L-shaped bending plates, located at the front and rear ends of the pad respectively. The top of the first L-shaped bending plate is detachably connected to the pad through a first detachable connector.

[0026] The bottom of each of the two first L-shaped bent plates is fixedly connected to a horizontally arranged connecting plate, and the two connecting plates are fixedly connected by a connecting frame. Both connecting plates are located below the longitudinal beam.

[0027] The adjusting nut is fixedly connected to the top of the connecting plate. The upper end of the adjusting bolt passes through the connecting plate and the adjusting nut in sequence and is threadedly connected to both the connecting plate and the adjusting nut. The lower end of the adjusting bolt is fixedly connected to the first tightening rod. The upper end of the adjusting bolt can abut against the bottom of the upper longitudinal beam.

[0028] Furthermore, the support assembly includes a support plate, long nuts, four corner flange bolts, and silicone gaskets;

[0029] The support plate abuts against the top of the front longitudinal beam, the long nut is fixedly connected to the top of the support plate, the lower part of the four corner flange bolts is threaded into the long nut, and the silicone pad is fixedly connected to the top of the four corner flange bolts; the support plate and the positioning assembly are detachably connected.

[0030] Furthermore, the positioning assembly includes a second L-shaped bending plate, a connecting block, a second detachable connector, a positioning bolt, a positioning nut, and a second tightening rod;

[0031] There are two second L-shaped bending plates, located at the front and rear ends of the support plate respectively. The top of the second L-shaped bending plate is detachably connected to the support plate through a second detachable connector.

[0032] The bottoms of both second L-shaped bending plates are fixedly connected to the top of the connecting block;

[0033] The positioning nut is fixedly connected to the top of the connecting block. The upper end of the positioning bolt passes through the connecting block and the positioning nut in sequence and is threadedly connected to both the connecting block and the positioning nut. The lower end of the positioning bolt is fixedly connected to the second tightening rod. The upper end of the positioning bolt can abut against the bottom of the upper longitudinal beam.

[0034] The beneficial effects of this utility model are:

[0035] 1. The main frame provides stable support for the entire fixture. The load-bearing components support the rear axle, and the position of the load-bearing components along the length of the main frame can be adjusted by the adjustment components. By setting two load-bearing brackets, the spacing between the two load-bearing brackets can be adjusted to adapt to different models of rear axles, making it highly versatile. The rear axle motor is supported by the support components of the positioning bracket, and the position of the support components along the length of the main frame can be adjusted by the positioning components to adjust the positioning contact points, so that the assembly surface and bolt holes of the rear axle and the frame are precisely aligned, resulting in efficient and high-precision assembly.

[0036] 2. By using a combination of arc-shaped load-bearing plates, diagonal braces, and pads, deformation caused by local stress concentration is avoided. The system fits the rear axle brake disc housing and the spacing of the load-bearing brackets can be adjusted by adjusting the components, allowing the brackets to move along the longitudinal beams to adapt to different models of rear axles.

[0037] 3. Through the coordinated use of the first L-shaped bending plate, connecting plate, connecting frame, first detachable connector, adjusting bolt, adjusting nut and first tightening rod, the load-bearing components can be moved along the longitudinal beam length of the main frame according to different models of rear axles. The spacing of the arc load-bearing plates can be adjusted to hold different models of rear axle products. Rotating the first tightening rod makes the upper end of the adjusting bolt press against the bottom of the longitudinal beam on the upper side of the main frame, thereby completing the limiting of the load-bearing components. The adjustment is convenient, no additional tools are required, and the assembly efficiency is improved.

[0038] 4. The rear axle motor is supported by the combination of support plates, long nuts, four-corner flange bolts, and silicone pads. The height of the silicone pads can be adjusted by rotating the four-corner flange bolts. The silicone pads provide cushioning to avoid damage to the motor from rigid contact. During assembly, the height of the motor positioning support can be adjusted by rotating the four-corner flange bolts without the need for auxiliary tools, so that the rear axle is completely aligned with the frame mounting surfaces, holes, and other components, thereby improving the installation accuracy and efficiency of the rear axle.

[0039] 5. Through the combined use of the second L-shaped bending plate, connecting block, second detachable connector, positioning bolt, positioning nut, and second tightening rod, the upper end of the positioning bolt is disengaged from the bottom of the upper longitudinal beam by rotating the positioning bolt, allowing the support assembly to move along the length of the upper longitudinal beam of the main frame. The positioning contact point is adjusted, and after being adjusted to the corresponding position of the rear axle motor, the positioning bolt is rotated so that the upper end of the positioning bolt abuts against the bottom of the upper longitudinal beam, thereby completing the positioning of the support assembly and improving the installation accuracy and efficiency of the rear axle. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0041] Figure 2 This is an assembly diagram of the present invention;

[0042] Figure 3 This is a schematic diagram of the main frame structure in this utility model;

[0043] Figure 4 This is a schematic diagram of the load-bearing bracket in this utility model;

[0044] Figure 5 This is a schematic diagram of the positioning bracket in this utility model;

[0045] The attached diagram is labeled as follows:

[0046] Main frame 1, column 11, support frame 12, trolley connector 13, load-bearing bracket 2, load-bearing component 3, load-bearing frame 31, arc load-bearing plate 32, pad 33, adjustment component 4, first L-shaped bending plate 41, connecting plate 42, connecting frame 43, first detachable connector 44, adjusting bolt 45, adjusting nut 46, first tightening rod 47, positioning bracket 5, support component 6, support plate 61, long nut 62, four-corner flange bolt 63, silicone pad 64, positioning component 7, second L-shaped bending plate 71, connecting block 72, second detachable connector 73, positioning bolt 74, positioning nut 75, second tightening rod 76, rear axle 8, rear axle motor 81, brake disc protective shell 82. Detailed Implementation

[0047] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0048] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0049] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0050] like Figures 1-5 As shown, an adjustable rear axle assembly fixture includes a main frame 1, a load-bearing bracket 2, and a positioning bracket 5.

[0051] Two load-bearing supports 2 are provided and are spaced apart on the main frame 1, and the positioning support 5 is located between the two load-bearing supports 2.

[0052] The load-bearing bracket 2 includes a load-bearing component 3 and an adjustment component 4 arranged sequentially from top to bottom;

[0053] The load-bearing component 3 is used to support the rear axle 8; the adjustment component 4 is used to adjust the position of the load-bearing component 3 on the main frame 1 along the length of the main frame 1.

[0054] The positioning bracket 5 includes a support component 6 and a positioning component 7 arranged sequentially from top to bottom;

[0055] The support component 6 is used to support the rear axle motor 81; the positioning component 7 is used to adjust the position of the support component 6 on the main frame 1 along the length direction of the main frame 1.

[0056] like Figure 3 As shown, as a preferred embodiment, the main frame 1 includes a column 11, two support frames 12, and a trolley connector 13;

[0057] The two support frames 12 are spaced apart from top to bottom. The support frame 12 has a rectangular frame structure and includes two longitudinal beams and two transverse beams. The two longitudinal beams are fixedly connected by the transverse beams.

[0058] The two support frames 12 are fixedly connected by a column 11;

[0059] The trolley connector 13 is mounted on the lower support frame 12 and is used to detachably connect the main frame 1 to the lifting trolley.

[0060] In this embodiment, two sets of trolley connectors 13 are provided on each of the two crossbeams, spaced apart along the front-to-back direction. Each trolley connector 13 includes a connecting bolt, a flat washer, a spring washer, and a connecting nut. The connecting bolt is vertically threaded onto the crossbeam, with its lower end penetrating the crossbeam for threaded connection with the lifting trolley. The main frame 1 is assembled with the lifting trolley by connecting the connecting nut to the connecting bolt. The flat washer and spring washer are sequentially fitted onto the connecting bolt from top to bottom, located between the head of the connecting bolt and the crossbeam. Eight columns 11 are provided, arranged in a circumferential array along the support frame 12, and used to fix and connect the upper and lower support frames 12. The main frame 1 adopts a double-layer support frame 12 combined with the column 11 structure to enhance overall rigidity; and, in conjunction with the trolley connectors 13, achieves a detachable connection with the lifting trolley, ensuring structural stability and preventing deformation during assembly.

[0061] like Figure 4 As shown, as a preferred embodiment, the load-bearing component 3 includes a load-bearing frame 31, an arc-shaped load-bearing plate 32, and a pad 33;

[0062] The arc-shaped load-bearing plate 32 and the pad 33 are respectively fixedly connected to the top and bottom of the load-bearing frame 31;

[0063] The arc-shaped load-bearing plate 32 is used to support the brake disc protective shell 82 at both ends of the rear axle 8;

[0064] The pad 33 is detachably connected to the adjusting assembly 4, and the pad 33 is used to abut against the top of the upper longitudinal beam.

[0065] In this embodiment, the arc-shaped load-bearing plate 32 can fit snugly against the brake disc protective housing 82 at both ends of the rear axle 8. The load-bearing frame 31 includes an upper load-bearing beam, a lower load-bearing beam, an inner load-bearing column, an outer load-bearing column, and diagonal braces; the middle parts of the upper and lower load-bearing beams are fixedly connected by the inner load-bearing column, and two outer load-bearing columns are provided, which are fixedly connected to the front and rear ends of the upper load-bearing beam respectively, with the bottom of the outer load-bearing column fixedly connected to the top of the lower load-bearing beam; two diagonal braces are provided, which are fixedly connected to the inner sidewalls of the two outer load-bearing columns respectively, and the front and rear outer sidewalls of the arc-shaped load-bearing plate 32 are welded to the inclined surfaces of the two diagonal braces respectively; the bottom of the lower load-bearing beam is fixedly connected to the top of the pad 33. By using the arc-shaped load-bearing plate 32, diagonal braces, and pad 33 in combination, deformation caused by local stress concentration is avoided, the rear axle 8 brake disc housing is snugly fitted, and the spacing of the load-bearing brackets 2 is adjusted by the adjusting component 4, so that the brackets can move along the longitudinal beam to adapt to different models of rear axles 8.

[0066] like Figure 4 As shown, as a preferred embodiment, the adjustment assembly 4 includes a first L-shaped bending plate, a connecting plate 42, a connecting frame 43, a first detachable connector 44, an adjusting bolt 45, an adjusting nut 46, and a first tightening rod 47;

[0067] There are two first L-shaped bending plates, located at the front and rear ends of the pad 33 respectively. The top of the first L-shaped bending plate is detachably connected to the pad 33 through the first detachable connector 44.

[0068] The bottom of each of the two first L-shaped bent plates is fixedly connected to a horizontally arranged connecting plate 42, and the two connecting plates 42 are fixedly connected by a connecting frame 43. Both connecting plates 42 are located below the longitudinal beam. In this embodiment, the connecting frame 43 is a U-shaped frame.

[0069] The adjusting nut 46 is fixedly connected to the top of the connecting plate 42. The upper end of the adjusting bolt 45 passes through the connecting plate 42 and the adjusting nut 46 in sequence, and is threadedly connected to both the connecting plate 42 and the adjusting nut 46. The lower end of the adjusting bolt 45 is fixedly connected to the first tightening rod 47, and the upper end of the adjusting bolt 45 can abut against the bottom of the upper longitudinal beam. In this embodiment, each connecting plate 42 is provided with two adjusting bolts 45, adjusting nuts 46, and a first tightening rod 47.

[0070] In this embodiment, the two first L-shaped bending plates are located on the front and rear sides of the upper support frame 12, respectively. Four sets of the first detachable connectors 44 are provided, located at the four corners of the pad 33. Each first detachable connector 44 includes a first bolt and a first nut. The first nut is fixedly connected to the corner at the top of the pad 33. The upper end of the first bolt passes through the first L-shaped bending plate, the pad 33, and the first nut in sequence. The first bolt is threadedly connected to the first L-shaped bending plate, the support plate 61, and the first nut. By using the first L-shaped bending plate, connecting plate 42, connecting frame 43, first detachable connector 44, adjusting bolt 45, adjusting nut 46 and first tightening rod 47 in combination, the two longitudinal beams on the upper side of the main frame 1 are limited between the pad 33, connecting frame 43 and the two first L-shaped bending plates. Depending on the model of the rear axle 8, the load-bearing component 3 can be moved along the length of the longitudinal beam of the main frame 1 to adjust the spacing of the arc load-bearing plates 32 to hold different models of rear axle 8 products. After the spacing of the two arc load-bearing plates 32 is adjusted to the correct position, the first tightening rod 47 is rotated to press the upper end of the adjusting bolt 45 against the bottom of the longitudinal beam on the upper side of the main frame 1, thereby completing the limitation of the load-bearing component 3. The adjustment is convenient, requires no additional tools, and improves assembly efficiency.

[0071] like Figure 5 As shown, as a preferred embodiment, the support assembly 6 includes a support plate 61, a long nut 62, four corner flange bolts 63, and a silicone pad 64.

[0072] The support plate 61 abuts against the top of the front longitudinal beam, the long nut 62 is fixedly connected to the top of the support plate 61, the lower part of the four-corner flange bolt 63 is threaded into the long nut 62, and the silicone pad 64 is fixedly connected to the top of the four-corner flange bolt 63; the support plate 61 is detachably connected to the positioning assembly 7. Specifically, the support plate 61 abuts against the top of the front longitudinal beam of the upper support frame 12.

[0073] In this embodiment, four reinforcing ribs are circumferentially fixed to the outer peripheral wall of the long nut 62. The four reinforcing ribs are arranged in a circumferential array along the long nut 62, and the bottom of the reinforcing ribs is fixedly connected to the top of the support plate 61. The silicone pad 64 is embedded in the top of the four corner flange bolts 63 by applying sealant, which is used to prevent damage to the motor positioning surface when supporting the rear axle motor 81. The rear axle motor 81 is supported by the cooperation of the support plate 61, the long nut 62, the four corner flange bolts 63 and the silicone pad 64, and the height of the silicone pad 64 can be adjusted by rotating the four corner flange bolts 63; the reinforcing ribs enhance the structural strength of the long nut 62 and prevent thread damage; the silicone pad 64 provides cushioning and avoids rigid contact damage to the motor; during the assembly process, the height of the motor positioning support can be adjusted by rotating the four corner flange bolts 63 without the use of auxiliary tools, so that the rear axle 8 is completely fitted and aligned with the frame mounting surface, holes and other components.

[0074] like Figure 5 As shown, as a preferred embodiment, the positioning component 7 includes a second L-shaped bending plate, a connecting block 72, a second detachable connector 73, a positioning bolt 74, a positioning nut 75, and a second tightening rod 76.

[0075] There are two second L-shaped bending plates, located at the front and rear ends of the support plate 61 respectively. The top of the second L-shaped bending plate is detachably connected to the support plate 61 through the second detachable connector 73.

[0076] The bottoms of the two second L-shaped bending plates are fixedly connected to the top of the connecting block 72;

[0077] The positioning nut 75 is fixedly connected to the top of the connecting block 72. The upper end of the positioning bolt 74 passes through the connecting block 72 and the positioning nut 75 in sequence, and is threadedly connected to both the connecting block 72 and the positioning nut 75. The lower end of the positioning bolt 74 is fixedly connected to the second tightening rod 76. The upper end of the positioning bolt 74 can abut against the bottom of the upper longitudinal beam.

[0078] In this embodiment, four sets of the second detachable connector 73 are provided, located at the four corners of the support plate 61. The second detachable connector 73 includes a second bolt and a second nut. The second nut is fixedly connected to the corner at the top of the support plate 61. The upper end of the second bolt passes through the second L-shaped bending plate, the support plate 61, and the second nut in sequence. The second bolt is threadedly connected to the second L-shaped bending plate, the support plate 61, and the second nut. Through the cooperation of the second L-shaped bending plate, the connecting block 72, the second detachable connector 73, the positioning bolt 74, the positioning nut 75, and the second tightening rod 76, the positioning bolt 74 is rotated to disengage its upper end from the bottom of the upper longitudinal beam, allowing the support assembly 6 to move along the length of the upper longitudinal beam of the main frame 1. The positioning contact point is adjusted, and when it is adjusted to the corresponding position of the rear axle motor 81, the positioning bolt 74 is rotated to abut against the bottom of the upper longitudinal beam, thereby completing the positioning of the support assembly 6 and improving the installation accuracy and efficiency of the rear axle 8. In this embodiment, there are two of each of the positioning bolt 74, positioning nut 75, and second tightening rod 76.

[0079] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. An adjustable rear axle assembly fixture, characterized in that, include: The main frame (1), the load-bearing support (2), and the positioning support (5); Two load-bearing supports (2) are provided and are spaced apart on the main frame (1), and the positioning support (5) is located between the two load-bearing supports (2); The load-bearing bracket (2) includes a load-bearing component (3) and an adjusting component (4) arranged sequentially from top to bottom; The load-bearing component (3) is used to support the rear axle (8); the adjustment component (4) is used to adjust the position of the load-bearing component (3) on the main frame (1) along the length direction of the main frame (1); The positioning bracket (5) includes a support component (6) and a positioning component (7) arranged sequentially from top to bottom; The support component (6) is used to support the rear axle motor (81); the positioning component (7) is used to adjust the position of the support component (6) on the main frame (1) along the length direction of the main frame (1).

2. The adjustable rear axle assembly fixture as described in claim 1, characterized in that: The main frame (1) includes columns (11), two support frames (12) and trolley connectors (13); The two support frames (12) are spaced apart from top to bottom. The support frame (12) has a rectangular frame structure and includes two longitudinal beams and two transverse beams. The two longitudinal beams are fixedly connected by the transverse beams. The two support frames (12) are fixedly connected by a column (11); The trolley connector (13) is mounted on the lower support frame (12) and is used to detachably connect the main frame (1) to the lifting trolley.

3. The adjustable rear axle assembly fixture as described in claim 2, characterized in that: The load-bearing component (3) includes a load-bearing frame (31), an arc-shaped load-bearing plate (32), and a pad (33); The arc-shaped load-bearing plate (32) and the pad plate (33) are respectively fixedly connected to the top and bottom of the load-bearing frame (31); The arc-shaped load-bearing plate (32) is used to support the brake disc protective shell (82) of the rear axle (8); The pad (33) is detachably connected to the adjustment assembly (4), and the pad (33) is used to abut against the top of the upper longitudinal beam.

4. The adjustable rear axle assembly fixture as described in claim 3, characterized in that: The adjustment assembly (4) includes a first L-shaped bending plate, a connecting plate (42), a connecting frame (43), a first detachable connector (44), an adjusting bolt (45), an adjusting nut (46), and a first tightening rod (47); There are two first L-shaped bending plates, located at the front and rear ends of the pad (33) respectively. The top of the first L-shaped bending plate is detachably connected to the pad (33) through the first detachable connector (44). The bottom of each of the two first L-shaped bent plates is fixedly connected to a horizontally arranged connecting plate (42), and the two connecting plates (42) are fixedly connected to each other by a connecting frame (43). Both connecting plates (42) are located below the longitudinal beam. The adjusting nut (46) is fixedly connected to the top of the connecting plate (42). The upper end of the adjusting bolt (45) passes through the connecting plate (42) and the adjusting nut (46) in sequence, and is threadedly connected to both the connecting plate (42) and the adjusting nut (46). The lower end of the adjusting bolt (45) is fixedly connected to the first tightening rod (47). The upper end of the adjusting bolt (45) can abut against the bottom of the upper longitudinal beam.

5. The adjustable rear axle assembly fixture as described in claim 2, characterized in that: The support assembly (6) includes a support plate (61), a long nut (62), four-corner flange bolts (63), and a silicone pad (64); The support plate (61) abuts against the top of the front longitudinal beam, the long nut (62) is fixedly connected to the top of the support plate (61), the lower part of the four-corner flange bolt (63) is threaded into the long nut (62), and the silicone pad (64) is fixedly connected to the top of the four-corner flange bolt (63); the support plate (61) and the positioning assembly (7) are detachably connected.

6. The adjustable rear axle assembly fixture as described in claim 5, characterized in that: The positioning component (7) includes a second L-shaped bending plate, a connecting block (72), a second detachable connector (73), a positioning bolt (74), a positioning nut (75), and a second tightening rod (76); There are two second L-shaped bending plates, located at the front and rear ends of the support plate (61) respectively. The top of the second L-shaped bending plate is detachably connected to the support plate (61) through the second detachable connector (73). The bottoms of the two second L-shaped bending plates are fixedly connected to the top of the connecting block (72); The positioning nut (75) is fixedly connected to the top of the connecting block (72). The upper end of the positioning bolt (74) passes through the connecting block (72) and the positioning nut (75) in sequence, and is threadedly connected to both the connecting block (72) and the positioning nut (75). The lower end of the positioning bolt (74) is fixedly connected to the second tightening rod (76). The upper end of the positioning bolt (74) can abut against the bottom of the upper longitudinal beam.

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