Cab front tilt system

Abstract

This invention relates to a cab forward tilting system. The system includes a left front suspension bracket and a right front suspension bracket, which are fixedly connected by a connecting rod. The left and right front suspension brackets are symmetrically arranged and have identical structures, both connected to the vehicle body via the forward tilting bracket. The forward tilting bracket has mounting holes and a mounting frame. A soft pad, a soft pad pin, and a bushing are provided within the mounting holes. The soft pad pin passes through the soft pad and bushing and is installed within the mounting holes, with both ends protruding outside the mounting holes. One end is limited by a Y-axis limiting structure on the soft pad pin, and the other end is limited by a axial elastic retaining ring. The mounting frame is fixedly connected to the vehicle body by bolts. In this invention, the forward tilting bracket is concentrically connected to the pin via the soft pad and is fitted with a bushing. The contact area between the pin and the bushing is large, resulting in low cab tilting resistance. This invention provides ample operating space, good visibility, accurate positioning, and convenient installation, effectively improving the assembly efficiency of the cab.

Description

Technical Field

[0001] The invention relates to a commercial vehicle, in particular to a cab front flipping system. Background Art

[0002] In the traditional commercial vehicle double torsion bar rollover system, the suspension cushion is generally installed on the front suspension bracket. The front rollover bracket is installed on the bottom of the cab before the cab is installed. During the cab installation process, the front rollover bracket hole is aligned with the front suspension cushion hole, and then the cushion pin is inserted to tighten. When the cab is installed, the front suspension bracket and the front rollover bracket are connected by inserting the pin into the hole. This has the following problems in the actual loading process:

[0003] 1. Due to the numerous structures at the bottom of the cab, it is difficult to align the front suspension cushion and the front flip bracket holes;

[0004] 2. There is no X-axis and Z-axis positioning device during the cab installation and hole alignment process;

[0005] 3. When inserting the pin in the lateral direction (Y direction), it is necessary to reserve space for the installation and operation of the pin (the length is usually more than 100 mm), which places higher requirements on the spatial arrangement of the double torsion bar system and it is difficult to reserve space for operation with tools;

[0006] 4. The flip bracket rotates around the pin shaft, the contact surface is small and there is no sleeve transition. In addition, the bolts are tightened, which easily causes large flip resistance and flip noise.

[0007] This design and assembly method increases the difficulty of assembling the cab and affects the assembly efficiency of the cab. Summary of the invention

[0008] In order to solve the above problems, the present invention provides a cab front flipping system which has a simple structure, complete positioning and convenient installation.

[0009] The technical solution adopted by the present invention is: a cab front flip system, including a left front suspension bracket and a right front suspension bracket, the left front suspension bracket and the right front suspension bracket are fixedly connected by a connecting rod, and is characterized in that: the left front suspension bracket and the right front suspension bracket are symmetrically arranged and have the same structure, and are both connected to the vehicle body through the front flip bracket.

[0010] Preferably, the front flip bracket is provided with a mounting hole and a mounting frame, and a cushion, a cushion pin and a bushing are provided in the mounting hole. The cushion pin passes through the cushion and the bushing and is installed in the mounting hole, with both ends passing out of the mounting hole, one end is limited by the Y-direction limiting structure on the cushion pin, and the other end is limited by an elastic retaining ring for the shaft; the mounting frame is fixedly connected to the vehicle body by bolts.

[0011] Furthermore, both ends of the cushion pin shaft are provided with through holes connected to the left front suspension bracket or the right front suspension bracket, one end is provided with a threaded hole, and the surface where the threaded hole is located is perpendicular to the surface where the through hole is located; the middle part of the cushion pin shaft is provided with a cylindrical surface for installing the bushing, one end of the cylindrical surface is provided with a groove that cooperates with an elastic retaining ring for the shaft, and the other end is provided with a Y-direction limiting structure.

[0012] Furthermore, a locating pin is provided at one end of the cushion pin shaft, one end of the locating pin is connected to the threaded hole, and the other end is inserted into the Y-direction locating hole on the left front suspension bracket or the right front suspension bracket.

[0013] Preferably, the left front suspension bracket and the right front suspension bracket are both provided with an X-positioning surface, a Z-positioning surface, a threaded through hole and a Y-positioning hole.

[0014] The beneficial effects achieved by the present invention are as follows: the front flip bracket of the present invention is concentrically connected to the pin shaft through a soft pad and is equipped with a bushing, the contact area between the pin shaft and the bushing is large, and the flip resistance of the cab is small. The present invention has ample operating space, good operating vision, sufficient positioning, and convenient installation, which effectively improves the assembly efficiency of the cab. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of a traditional double torsion bar structure;

[0016] Figure 2 It is a structural explosion diagram of the present invention;

[0017] Figure 3 This is an exploded view of the front flip bracket assembly;

[0018] Figure 4 It is a structural schematic diagram of a cushion pin;

[0019] In the figure: 1. left front suspension bracket; 11. left X-positioning surface; 12. left Z-positioning surface; 13. left Y-positioning hole; 14. left threaded through hole; 15. left threaded through hole; 2. right front suspension bracket; 21. right X-positioning surface; 22. right Z-positioning surface; 23. right Y-positioning hole; 24. right threaded through hole; 25. right threaded through hole; 3. front flip bracket; 4. cushion; 5. cushion pin; 51 (52), through hole; 53, threaded hole; 54, through hole surface; 55, through hole vertical surface; 56, slot; 57, Y-positioning structure; 6. bushing; 7. shaft elastic retaining ring; 8. locating pin; 9. bolt. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] like Figure 1-Figure 4As shown, a cab front flip system of the present invention includes a left front suspension bracket 1 and a right front suspension bracket 2, and the left front suspension bracket 1 and the right front suspension bracket 2 are fixedly connected by a connecting rod. In this embodiment, the left front suspension bracket 1 and the right front suspension bracket 2 are symmetrically arranged and have the same structure, and are both connected to the vehicle body through a front flip bracket 3.

[0022] A mounting hole and a mounting frame are provided on the front flip bracket 3, and a cushion 4, a cushion pin 5 and a bushing 6 are provided in the mounting hole. The cushion pin 5 passes through the cushion 4 and the bushing 6 and is installed in the mounting hole, with both ends passing out of the mounting hole, one end being limited by the Y-direction limiting structure 57 on the cushion pin 5, and the other end being limited by the shaft elastic retaining ring 7; the mounting frame is fixedly connected to the vehicle body by bolts.

[0023] Through holes (51, 52) connected to the left front suspension bracket 1 or the right front suspension bracket 2 are formed at both ends of the cushion pin shaft 5, and a threaded hole 53 is formed at one end, and the surface where the threaded hole 53 is located (through hole vertical surface 55) is perpendicular to the surface where the through holes (51, 52) are located (through hole surface 54); a cylindrical surface for installing the bushing 6 is formed in the middle of the cushion pin shaft 5, and a slot 56 for matching with the shaft elastic retaining ring 7 is formed at one end of the cylindrical surface, and a Y-direction limiting structure 57 is formed at the other end. A positioning pin 8 is formed at one end of the cushion pin shaft 5, and one end of the positioning pin 8 is connected to the threaded hole 53, and the other end is inserted into the Y-direction positioning hole (left Y-direction positioning hole 13, right Y-direction positioning hole 23) on the left front suspension bracket 1 or the right front suspension bracket 2.

[0024] In this embodiment, the front flip bracket 3 is installed with the cushion 4, the bushing 6 is installed coaxially with the cushion 4, the cushion pin 5 is installed coaxially with the bushing 6, the cushion pin 5 is installed with the shaft by clamping with the elastic retaining ring 7, the positioning pin 8 is threadedly connected with the cushion pin 5, the front flip bracket 3 is connected with the vehicle body by bolts, and the cushion pin 5 is connected with the left front suspension bracket 1 and the right front suspension bracket 2 by bolts 9. The left front suspension bracket 1 is provided with a left X positioning surface 11, a left Z positioning surface 12, a left threaded through hole (14, 15) and a left Y-direction positioning hole 13, and the right front suspension bracket 2 is provided with a right X positioning surface 21, a right Z positioning surface 22, a right threaded through hole (24, 25) and a right Y-direction positioning hole 23. Through holes (51, 52) are formed at both ends of the cushion pin shaft 5, a threaded hole 53 is formed on a plane perpendicular to the through hole surface 54 (through hole vertical plane 55), a slot 56 is formed at one end of the cushion pin shaft 5, and a Y-direction limiting structure 57 is formed at the other end.

[0025] Before the cab is mounted on the suspension, the cushion 4 is first installed in the front flip bracket 3, and together with the cushion pin 5, bushing 6, shaft elastic retaining ring 7 and positioning pin 8, a small sub-assembly is formed and fixed to the bottom of the cab before the cab is mounted on the suspension system. The cushion pin 5 is positioned in the Y direction through the Y-direction limiting structure 57 on one side and the clamping groove 56 on the other side and the shaft elastic retaining ring 7, so that it can only rotate around the axis but cannot move in the Y direction.

[0026] During the cab installation process, the left and right cushion pin shaft surfaces (54, 55) are placed on the left and right front suspension bracket positioning surfaces (11, 12) and (21, 22) to complete the X and Z direction positioning. During the installation process, the left and right positioning pins 8 are respectively inserted into the corresponding Y direction positioning holes (13, 23) of the left and right front suspension brackets to complete the Y direction positioning and fixing. Then, the front flip bracket 3 is connected and fixed with the left and right front suspension brackets (1, 2) by bolts 9, and the installation direction of the bolts is the cab X direction.

[0027] The above shows and describes the basic principles and main structural features of the present invention. The present invention is not limited to the above examples. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A cab front tilting system, comprising a left front suspension bracket and a right front suspension bracket, wherein the left front suspension bracket and the right front suspension bracket are fixedly connected by a connecting rod, characterized in that: The left front suspension bracket and the right front suspension bracket are symmetrically arranged and have the same structure, and are both connected to the vehicle body through a front flip bracket; The front flip bracket is provided with a mounting hole and a mounting frame, wherein a cushion, a cushion pin shaft and a bushing are provided in the mounting hole, wherein the cushion pin shaft passes through the cushion and the bushing and is installed in the mounting hole, and both ends pass out of the mounting hole, wherein one end is limited by the Y-direction limiting structure on the cushion pin shaft, and the other end is limited by the shaft elastic retaining ring; the mounting frame is fixedly connected to the vehicle body by bolts; Both ends of the cushion pin shaft are provided with through holes connected to the left front suspension bracket or the right front suspension bracket, one end of which is provided with a threaded hole, and the surface where the threaded hole is located is perpendicular to the surface where the through hole is located; a cylindrical surface for installing a bushing is provided in the middle of the cushion pin shaft, one end of the cylindrical surface is provided with a groove that cooperates with an elastic retaining ring for the shaft, and the other end is provided with a Y-direction limiting structure.

2. The cab front tilting system according to claim 1, characterized in that: A positioning pin is provided at one end of the cushion pin shaft, one end of the positioning pin is connected to the threaded hole, and the other end is inserted into the Y-direction positioning hole on the left front suspension bracket or the right front suspension bracket.

3. The cab front tilting system according to claim 1, characterized in that: The left front suspension bracket and the right front suspension bracket are both provided with an X-positioning surface, a Z-positioning surface, a threaded through hole and a Y-positioning hole.

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