Front end fixing piece based on rear suspension guide arm of 7-meter full-load-bearing urban bus

Abstract

The utility model discloses a front end fixing piece based on a rear suspension guide arm of a 7-meter full-load-bearing urban bus, which comprises a U-shaped connecting piece, a front connecting piece is welded on the back of a back plate of the U-shaped connecting piece, a guide arm fixing seat is welded on the front of the back plate of the U-shaped connecting piece, and mounting holes are correspondingly arranged on the back plate of the U-shaped connecting piece, the guide arm fixing seat and the front connecting piece. Bolts penetrate through the mounting holes to fix the fixing piece on a frame structure; connecting holes are correspondingly formed in two side plates of the U-shaped connecting piece; and a connecting sleeve at the end part of the rear suspension guide arm is arranged between the two side plates of the U-shaped connecting piece by adopting a pin shaft through the connecting holes and is partially positioned in the guide arm fixing seat. The overall design structure of the fixing part is optimized and adjusted, the whole vehicle production process requirement for disassembling, repairing and maintaining convenience in the assembling and after-sale process is met, meanwhile, the stress requirement of a vehicle running under various running working conditions is guaranteed, and the running reliability of the vehicle is also guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of bus manufacturing, and particularly relates to a front fixing part of a rear suspension guide arm of a 7-meter full-load urban bus. Background Art

[0002] Currently, for the existing structure of the front fixing part of the rear suspension guide arm of a 7-meter full-load urban bus, as Figure 1 shown: Two front fixing parts of the rear suspension guide arm are respectively welded to both ends of the frame assembly (partial), and then two rear suspension guide arms are installed on the front fixing parts of the rear suspension guide arm through M18 flange bolts. Among them, when the front fixing part of the rear suspension guide arm is welded to the frame assembly (partial) by carbon dioxide gas shielded welding, it is necessary to pass through the corresponding longitudinal beam square tube, which greatly increases the production difficulty, the control of design dimensions, and the difficulty of ensuring the consistency of each vehicle model after mass production.

[0003] In addition, when four M18 flange bolts are used for installation during production and assembly, the two bolts on the inner side of the rear suspension guide arm cannot be normally installed due to the too small distance between them and the side of the frame assembly (partial), and it is even more difficult to disassemble during after-sales maintenance. Moreover, the tightening torque of the two M18 flange bolts on the inner side after the rear suspension guide arm is installed cannot meet the requirements in the whole vehicle production, resulting in the loosening of the flange bolts during the long-term use of the vehicle, and finally making the vehicle unable to drive normally. Content of the Utility Model

[0004] In order to solve the above technical problems, the utility model provides a new front fixing part of a rear suspension guide arm of a 7-meter full-load urban bus.

[0005] The technical solution adopted by the utility model is that for the front fixing part of the rear suspension guide arm of a 7-meter full-load urban bus, it includes a U-shaped connecting piece. The back of the back plate of the U-shaped connecting piece is welded with a front connecting piece, and the front is welded with a guide arm fixing seat. Corresponding mounting holes are opened on the back plate of the U-shaped connecting piece, the guide arm fixing seat and the front connecting piece, and the fixing part is fixed on the frame structure by bolts passing through the mounting holes; corresponding connecting holes are opened on both side plates of the U-shaped connecting piece, and the connecting sleeves at the ends of the rear suspension guide arm are installed between the two side plates of the U-shaped connecting piece through pins and partially located inside the guide arm fixing seat.

[0006] Preferably, a groove for accommodating the connecting sleeve is provided in the middle of the above-mentioned guide arm fixing seat, and the two sides of the groove are the supports of the guide arm fixing seat, and one mounting hole is opened on each of the two supports.

[0007] Preferably, upper reinforcing ribs are provided above both of the above-mentioned supports, and lower reinforcing ribs are provided below both of the supports.

[0008] Preferably, the upper and lower parts of the above-mentioned front connecting piece are bent outwards to form limiting plates.

[0009] Preferably, rectangular notches are provided at the upper parts of the front ends of the two side plates of the above-mentioned U-shaped connecting piece.

[0010] Based on the structural characteristics of the full-load urban bus, by reasonably adjusting the overall design structure of the front fixing part of the rear suspension guide arm of the 7-meter full-load urban bus, while meeting the convenience of the assembly of the rear suspension guide arm of the 7-meter full-load urban bus according to the technological requirements in the whole vehicle production process and the disassembly, maintenance and repair during the after-sales process of the whole vehicle, the force requirements of the assembly structure during various operating conditions of the vehicle operation are ensured, the reliability of the vehicle operation is also guaranteed, and the maintenance and use cost of the whole vehicle is greatly reduced.

[0011] Compared with the prior art, the beneficial effects of the present utility model are specifically reflected in:

[0012] 1) The overall design structure of the present utility model adopts an independent design, that is, the front fixing part of the rear guide arm and the frame structure are independent of each other. After the front fixing part of the rear guide arm is manufactured, it can be directly welded to the inside of the manufactured frame structure by using carbon dioxide gas shielded welding, without considering the manufacturing cycle of the front fixing part of the rear guide arm while the frame structure can be manufactured in advance, greatly improving the production efficiency and the ability to guarantee the consistency of products.

[0013] 2) When installing the left and right rear suspension guide arms, use M18 flange bolts to pass through the front connecting piece and the guide arm fixing seat and then install M18 flange nuts, which solves the problem that the bolts cannot be normally installed due to the small space, and also solves the problem that it is difficult to disassemble during after-sales maintenance.

[0014] 3) After the left and right rear suspension guide arms are installed with bolts, professional pneumatic tools can be used to tighten them and then a torque wrench is used to detect the tightening torque, so that the tightening torque of the installed nuts is qualified, avoiding the loosening of bolts and nuts during the long-term use of the vehicle, and improving the reliability of the whole vehicle use. Description of the Drawings

[0015] Figure 1 It is an assembly schematic diagram of the front fixing part of the rear suspension guide arm of the current 7-meter full-load urban bus;

[0016] Figure 2 It is a structural schematic diagram of the front fixing part of the rear suspension guide arm of the 7-meter full-load urban bus of the present utility model;

[0017] Figure 3 It is a structural schematic diagram of the U-shaped connecting piece;

[0018] Figure 4Schematic diagram of the structure of the guide arm fixing seat;

[0019] Figure 5 Schematic diagram of the structure of the front connecting piece;

[0020] Figure 6 Assembly schematic diagram of the front fixing piece of the rear suspension guide arm of the 7 - meter fully - loaded urban bus of the present utility model. Specific implementation mode

[0021] The following will further explain and illustrate the present utility model in conjunction with the specification drawings for better understanding by those skilled in the art.

[0022] Embodiment 1

[0023] As Figure 2-6 shown, based on the front fixing piece of the rear suspension guide arm of the 7 - meter fully - loaded urban bus, it includes a U - shaped connecting piece 1. The front connecting piece 2 is welded to the back of the back plate 101 of the U - shaped connecting piece 1, and the guide arm fixing seat 3 is welded to the front of the back plate 101 of the U - shaped connecting piece 1. And corresponding mounting holes are provided on the back plate 101 of the U - shaped connecting piece 1, the guide arm fixing seat 3 and the front connecting piece 2. The fixing piece is fixed to the frame structure 4 by bolts passing through the mounting holes. Corresponding connecting holes 5 are provided on the two side plates 102 of the U - shaped connecting piece 1. The connecting sleeve 7 at the end of the rear suspension guide arm 6 is installed between the two side plates 102 of the U - shaped connecting piece 1 by a pin through the connecting hole 5 and is partially located inside the guide arm fixing seat 3. The frame structure 4 (partial) is provided with a space for the installation of the container in cooperation with the fixing piece. The front fixing piece of the rear guide arm and the frame structure 4 exist independently of each other. When the front fixing piece of the rear guide arm is manufactured, it can be directly welded to the inside of the manufactured frame structure 4 by CO₂ gas shielded welding without considering the manufacturing cycle of the front fixing piece of the rear guide arm, and the frame structure 4 can be manufactured in advance, greatly improving the production efficiency and the ability to guarantee product consistency.

[0024] A groove 301 for accommodating the connecting sleeve 7 is provided in the middle of the guide arm fixing seat 3. The two sides of the groove 301 are the supports 302 of the guide arm fixing seat 3, and one mounting hole is provided on each of the two supports 302. In order to strengthen the structural strength and stability of the guide arm fixing seat 3, upper reinforcing ribs 8 are provided above both supports 302, and lower reinforcing ribs 9 are provided below both supports 302. The upper reinforcing ribs 8 and the lower reinforcing ribs 9 are respectively connected to the guide wall fixing seat 3 and the back plate 101 of the U - shaped connecting piece 1.

[0025] Furthermore, the upper and lower parts of the above - mentioned front connecting piece 2 are bent outward to form limit plates 201, surrounding the cross - beam of the frame structure 4 inside the front connecting piece 2, increasing the connection area and improving the connection firmness.

[0026] Rectangular notches 103 are provided at the upper parts of the front ends of both side plates of the above U-shaped connecting member 1 to make room for the cross beam of the vehicle frame structure 4 and avoid interference.

[0027] In the structure of the present utility model, the U-shaped connecting member, the front connecting member, the upper reinforcing rib and the lower reinforcing rib are all processed and prepared from steel plates made of Q355 material with a thickness of 8 mm, and the guide arm fixing seat is processed and prepared from 45# steel with a thickness of 40 mm. The five components are welded and combined by CO2 gas shielded welding according to the requirements of the design dimensions and process requirements to obtain the front fixing member of the rear guide arm. When installing the left and right rear suspension guide arms 6, use M18 flange bolts to pass through the front connecting member 2 and the guide arm fixing seat 3, and then install M18 flange nuts, which solves the problem that the bolts cannot be normally installed due to the small space, and solves the problem that it is difficult to disassemble during after-sales maintenance.

[0028] After the left and right rear suspension guide arms are installed with bolts, a professional pneumatic tool is used to tighten them, and then a torque wrench is used to detect the tightening torque to make the tightening torque of the installed nut qualified. This avoids the situation of loosening of bolts and nuts during the long-term use of the vehicle and improves the reliability of the whole vehicle.

[0029] The embodiments described above are only descriptions of the preferred embodiments of the present utility model and do not limit the scope of the present utility model. Without departing from the design spirit and principles of the present utility model, various deformations and improvements made by those skilled in the art to the technical solutions of the present utility model shall fall within the protection scope determined by the claims of the present utility model.

Claims

1. The front end fixing part based on the rear suspension guide arm of a 7-meter full-load city bus is characterized in that: The invention comprises a U-shaped connecting piece (1), a front connecting piece (2) being welded to the back of a back plate (101) of the U-shaped connecting piece (1), and a guide arm fixing seat (3) being welded to the front; mounting holes are correspondingly provided on the back plate (101), the guide arm fixing seat (3) and the front connecting piece (2); bolts are passed through the mounting holes to fix the fixing piece to a vehicle frame structure (4); connecting holes (5) are correspondingly provided on two side plates (102) of the U-shaped connecting piece (1); a connecting sleeve (7) at the end of a rear suspension guide arm (6) is installed between the two side plates of the U-shaped connecting piece (1) through the connecting hole (5) by means of a pin shaft and is partially located in the guide arm fixing seat (3).

2. The front end fixing member based on the rear suspension guide arm of a 7-meter full-load city bus according to claim 1 is characterized in that: A groove (301) for accommodating the connecting sleeve (7) is provided in the middle of the outer side of the guide arm fixing seat (3), and supports (302) of the guide arm fixing seat (3) are provided on both sides of the groove (301), and a mounting hole is provided on each of the two supports (302).

3. The front end fixing member based on the rear suspension guide arm of a 7-meter full-load city bus according to claim 2 is characterized in that: Upper reinforcing ribs (8) are provided above the two supports (302), and lower reinforcing ribs (9) are provided below the two supports (302).

4. The front end fixing member based on the rear suspension guide arm of a 7-meter full-load city bus according to claim 1 is characterized in that: The upper and lower parts of the front connecting member (2) are both bent outwards to form a limiting plate (201).

5. The front end fixing member based on the rear suspension guide arm of a 7-meter full-load city bus according to claim 1 is characterized in that: Rectangular notches (103) are provided at the upper parts of the front ends of the two side plates of the U-shaped connecting piece (1).

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