Automobile steering device plumbing arm

Abstract

The utility model discloses a plumbing arm of an automobile steering device, and belongs to the technical field of automobiles. The defect that in the prior art, when a steering gear plumbing arm is horizontally arranged, height coordinates of a connecting point of the steering gear plumbing arm and a steering pull rod are inconvenient to adjust is overcome. The rubber spring mainly comprises a rubber main spring, an upper liquid chamber and a lower liquid chamber are arranged on the upper side and the lower side in the rubber main spring respectively, and a flow channel communicated with the upper liquid chamber and the lower liquid chamber is further arranged in the rubber main spring. An upper mounting plate is mounted at the top of the rubber main spring, a bottom supporting plate connected with the upper mounting plate is mounted at the bottom of the rubber main spring, a lower mounting plate is mounted between the upper liquid chamber and the lower liquid chamber of the rubber main spring, and the lower mounting plate is inserted into the rubber main spring.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobiles, and more particularly, to an automotive steering gear pitman arm. Background Art

[0002] An automotive steering gear pitman arm is a structure connecting the output end of the steering gear and the steering tie rod. One end of it is connected to the output end of the steering gear, and the other end is connected to the steering tie rod. During the vertical movement and roll movement of the suspension, the steering knuckle follows the vertical movement of the suspension. Therefore, there is an instantaneous center of motion formed by the moving parts of the suspension for the movement of the steering knuckle. At the same time, the steering knuckle is connected to the steering tie rod of the steering system, and there is a center of motion around which the steering knuckle rotates at the hard point between the steering gear pitman arm and the tie rod. In view of this, due to the combined influence of the suspension and steering, there are two centers of motion for the movement of the steering knuckle. Therefore, there is a kinematic interference between the suspension and the steering system, which affects the rotation of the steering knuckle. When the vehicle is turning, due to the roll of the whole vehicle, there are vertical movements in opposite directions on the left and right sides of the suspension. There is a kinematic interference between the suspension and the steering system, which affects the rotation of the steering knuckle, causing a change in the steering angle, and further affecting the understeer performance of the whole vehicle. When the vehicle is driving on a bumpy road, due to the vertical or roll movement of the suspension, if it is necessary to keep the vehicle driving straight, when the interference between the suspension and the steering system is too large, it will affect the rotation of the steering knuckle, causing a change in the steering angle to be reflected in the rotation of the steering wheel. In severe cases, it may even cause the situation of "hitting the hand" of the steering wheel, affecting the comfort. In the prior art, generally, through multi-body dynamics simulation analysis in the design stage, the mutual influence between the suspension and the steering system is analyzed to obtain the change in the steering knuckle angle, that is, the toe gradient. The appropriate toe gradient can be obtained by adjusting and optimizing the coordinates of the connection point between the steering gear pitman arm and the steering tie rod, as well as other hard point coordinates. Among them, the height coordinate of the connection point between the steering gear pitman arm and the steering tie rod has a greater influence on the toe gradient.

[0003] In the performance tuning stage of the existing steering pitman arm, the length of the pitman arm is fixed and it is difficult to adjust the length of the pitman arm. However, in the actual tuning process of the prototype vehicle, for the requirement of the understeer degree of the whole vehicle, the required understeer degree of the whole vehicle is often obtained by changing the suspension stiffness and the diameter of the stabilizer bar. Although the hard point simulation is optimized in the design stage, on the one hand, there is a difference between the toe gradient obtained by simulation analysis and the actual state of the prototype vehicle, and it is impossible to achieve the best adjustment of the steering hard points only relying on the simulation results. On the other hand, during the performance tuning process, more adjustment schemes are expected. However, since the length of the pitman arm cannot be changed, it will also cause the inability to obtain a more appropriate understeer degree through hard points tuning.

[0004] Patent Publication No. CN116729482A, titled "Vertical Arm Assembly with Adjustable Length". In this patent, holes with different distances are pre - machined on the vertical arm to change the actual installation position of components. By changing the length of the vertical arm in the vertical direction, the height coordinate of the connection point between the steering gear vertical arm and the steering tie rod is adjusted, thereby realizing the adjustment of the height of the connection point between the steering gear vertical arm and the steering tie rod. As shown in the attached drawings of the above - mentioned patent specification Figure 1 and Figure 3 . However, due to the limited number of holes machined on the steering gear vertical arm, the adjustable range is small and fixed. It is only applicable to vehicles with different suspension types and cannot meet the needs of adjusting more hard - point solutions during performance tuning. At the same time, the adjustment scheme for the length of the vertical arm in the above - mentioned patent is only applicable to the steering system with the vertical arrangement of the steering gear vertical arm. As shown in Figure 4 of the attached drawings of this patent specification, the height coordinate of the connection point between the steering gear vertical arm and the steering tie rod can be adjusted by adjusting the length of the vertical arm. But for the steering system with the horizontal arrangement of the steering gear vertical arm, as shown in Figure 5 of the attached drawings of this patent specification, changing the length of the vertical arm cannot adjust the height coordinate of the connection point between the steering gear vertical arm and the steering tie rod, because changing the length cannot change the coordinate position of the connection point between the steering gear vertical arm and the steering tie rod in the vertical direction, and thus cannot meet the adjustment of interference between the suspension and the steering system, nor can it meet the needs of tuning the understeer performance of the whole vehicle. Summary of the Invention

[0005] The purpose of the present utility model is to provide a vertical arm of an automotive steering gear to overcome the drawback that when the vertical arm of the steering gear is horizontally arranged, it is inconvenient to adjust the height coordinate of the connection point between the vertical arm of the steering gear and the steering tie rod in the prior art.

[0006] The present utility model is implemented by the following technical solutions. A vertical arm of an automotive steering gear includes a first vertical arm body and a second vertical arm body connected to each other. A steering gear connection hole is opened on the first vertical arm body, and a steering tie rod connection hole is opened on the second vertical arm body. A height adjustment structure is provided between the first vertical arm body and the second vertical arm body for adjusting the height difference between the steering gear connection hole and the steering tie rod connection hole.

[0007] Further, the height adjustment structure includes a first connecting plate connected to the first vertical arm body, a second connecting plate connected to the second vertical arm body, and at least one gasket. Fixing holes are respectively opened on the first connecting plate and the second connecting plate. A fixing bolt is inserted between the fixing hole of the first connecting plate and the fixing hole of the second connecting plate, and a fixing nut is installed on the fixing bolt. The gasket is arranged between the first connecting plate and the second connecting plate.

[0008] Further, the first connecting plate and the second connecting plate are arranged in parallel.

[0009] Further, two fixing holes are respectively formed on the first connecting plate and the second connecting plate, and the fixing holes on the first connecting plate and the second connecting plate correspond to each other one by one.

[0010] Further, a perforation for the fixing bolt to pass through is formed on the gasket.

[0011] Further, the thickness of the gasket is 0.5 - 2 mm.

[0012] Further, the first vertical arm body includes a first mounting plate provided with a steering gear connection hole, and the first connecting plate is connected to the first mounting plate.

[0013] Further, the second vertical arm body includes a second mounting plate provided with a steering tie rod connection hole. The second mounting plate is connected to a cross plate, the cross plate is connected to an inclined plate, and the inclined plate is connected to the second connecting plate.

[0014] Further, five gaskets are installed between the first connecting plate and the second connecting plate, and the five gaskets are stacked in sequence.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] By setting a height adjustment structure, that is, by stacking different numbers of gaskets between the first connecting plate and the second connecting plate, the purpose of adjusting the height difference between the steering gear connection hole and the steering tie rod connection hole is achieved. Furthermore, when the height coordinate of the steering gear connection hole remains unchanged, the purpose of adjusting the height coordinate of the steering tie rod connection hole is achieved, and then the purpose of adjusting the height coordinate of the connection point between the steering tie rod and the steering gear vertical arm is achieved. This effectively solves the drawback that when the steering gear vertical arm is horizontally arranged, it is inconvenient to adjust the height coordinate of the connection point between the steering gear vertical arm and the steering tie rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the present utility model;

[0018] Figure 2 is a schematic diagram of the first vertical arm body of the present utility model;

[0019] Figure 3 is a schematic diagram of the second vertical arm body of the present utility model;

[0020] Figure 4 is a partial schematic diagram of the steering system when the steering gear vertical arm is vertically arranged in the prior art;

[0021] Figure 5 is a partial schematic diagram of the steering system when the steering gear vertical arm is horizontally arranged in the prior art.

[0022] In the figure: 1. First vertical arm body; 2. Second vertical arm body; 3. Steering gear connection hole; 4. Steering tie rod connection hole; 5. First connecting plate; 6. Second connecting plate; 7. Gasket; 8. Fixing bolt; 9. Fixing nut; 10. Fixing hole; 11. First mounting plate; 12. Second mounting plate; 13. Horizontal plate; 14. Inclined plate. Detailed implementation manner

[0023] In order to enable those skilled in the art to better understand the technical solutions in the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0024] An automotive steering gear drop arm includes a first vertical arm body 1 and a second vertical arm body 2 which are connected to each other. A steering gear connection hole 3 is opened on the first vertical arm body 1, and a steering tie rod connection hole 4 is opened on the second vertical arm body 2; a height adjustment structure for adjusting the height difference between the steering gear connection hole 3 and the steering tie rod connection hole 4 is provided between the first vertical arm body 1 and the second vertical arm body 2.

[0025] The steering gear connection hole 3 on the first vertical arm body 1 of the present utility model is used to connect the steering gear, and the steering tie rod connection hole 4 on the second vertical arm body 2 is used to connect the steering tie rod; the height adjustment structure can adjust the height difference between the steering gear connection hole 3 and the steering tie rod connection hole 4, and further, when the height in the Z direction of the steering gear connection hole 3 remains unchanged, the height in the Z direction of the steering tie rod connection hole 4 is adjusted, so as to achieve the purpose of adjusting the height coordinate in the Z direction of the connection point between the steering tie rod and the drop arm, which well solves the shortcoming that it is inconvenient to adjust the height coordinate in the Z direction of the connection point between the steering tie rod and the drop arm when the steering gear drop arm is horizontally arranged currently.

[0026] The height adjustment structure includes a first connecting plate 5 connected to the first vertical arm body 1, a second connecting plate 6 connected to the second vertical arm body 2, and at least one gasket 7. Fixing holes 10 are respectively opened on the first connecting plate 5 and the second connecting plate 6. A fixing bolt 8 is inserted between the fixing hole 10 of the first connecting plate 5 and the fixing hole 10 of the second connecting plate 6, and a fixing nut 9 is installed on the fixing bolt 8. The gasket 7 is arranged between the first connecting plate 5 and the second connecting plate 6.

[0027] In the present utility model, a bolt passes through the fixing holes 10 of the first connecting plate 5 and the fixing holes 10 of the second connecting plate 6. One end of the bolt is connected to a nut, and the first connecting plate 5 and the second connecting plate 6 are fixedly connected by the bolt and nut. At least two fixing holes 10 are provided on both the first connecting plate 5 and the second connecting plate 6, and the fixing holes 10 between the first connecting plate 5 and the second connecting plate 6 correspond to each other one by one. In the present utility model, two fixing holes 10 are respectively provided on both the first connecting plate 5 and the second connecting plate 6, then two bolts pass through between the first connecting plate 5 and the second connecting plate 6, and they are fixedly connected by the two bolts. At least one negative film is installed between the first connecting plate 5 and the second connecting plate 6. The present utility model adjusts the height between the first connecting plate 5 and the second connecting plate 6 by adjusting the number of the gaskets 7 between the first connecting plate 5 and the second connecting plate 6, and further achieves the purpose of adjusting the height between the steering gear connecting hole 3 and the steering tie rod connecting hole 4.

[0028] The first connecting plate 5 and the second connecting plate 6 are arranged in parallel.

[0029] In the present utility model, the first connecting plate 5 and the second connecting plate 6 are arranged in parallel, and the top surfaces of the first mounting plate 11 and the second mounting plate 12 are both flush with

[0030] A perforation for the fixing bolt 8 to pass through is provided on the gasket 7.

[0031] In the present utility model, the fixing bolt 8 passes through the gasket 7, which can achieve the purpose of better fixing the gasket 7.

[0032] The thickness of the gasket 7 is 0.5 - 2 mm. Preferably, the thickness of the gasket 7 in the present utility model is 1 mm.

[0033] The first vertical arm body 1 includes a first mounting plate 11 provided with a steering gear connecting hole 3, and the first connecting plate 5 is connected to the first mounting plate 11.

[0034] The second vertical arm body 2 includes a second mounting plate 12 provided with a steering tie rod connecting hole 4. The second mounting plate 12 is connected to a cross plate 13, the cross plate 13 is connected to an inclined plate 14, and the inclined plate 14 is connected to the second connecting plate 6.

[0035] Five gaskets 7 are installed between the first connecting plate 5 and the second connecting plate 6, and the five gaskets 7 are stacked in sequence.

Claims

1. A pitman arm of an automotive steering gear, characterized in that, It includes a first vertical arm body (1) and a second vertical arm body (2) which are connected to each other. A steering gear connection hole (3) is formed on the first vertical arm body (1), and a steering tie rod connection hole (4) is formed on the second vertical arm body (2); a height adjustment structure for adjusting the height difference between the steering gear connection hole (3) and the steering tie rod connection hole (4) is provided between the first vertical arm body (1) and the second vertical arm body (2).

2. The pitman arm of the vehicle steering gear according to claim 1, characterized in that, The height adjustment structure includes a first connecting plate (5) connected to the first vertical arm body (1), a second connecting plate (6) connected to the second vertical arm body (2), and at least one gasket (7). Fixing holes (10) are respectively formed on the first connecting plate (5) and the second connecting plate (6). A fixing bolt (8) is inserted between the fixing hole (10) of the first connecting plate (5) and the fixing hole (10) of the second connecting plate (6), and a fixing nut (9) is installed on the fixing bolt (8). The gasket (7) is arranged between the first connecting plate (5) and the second connecting plate (6).

3. The pitman arm of the vehicle steering gear according to claim 2, characterized in that, The first connecting plate (5) and the second connecting plate (6) are arranged in parallel.

4. The pitman arm of the vehicle steering gear according to claim 3, characterized in that, Two fixing holes (10) are respectively formed on the first connecting plate (5) and the second connecting plate (6), and the fixing holes (10) on the first connecting plate (5) and the second connecting plate (6) correspond to each other one by one.

5. The pitman arm of the vehicle steering gear according to claim 2, characterized in that, A through hole for the fixing bolt (8) to pass through is formed on the gasket (7).

6. The pitman arm of the vehicle steering gear according to claim 2, wherein The thickness of the gasket (7) is 0.5 - 2 mm.

7. The pitman arm of the vehicle steering gear according to claim 2, characterized in that, The first vertical arm body (1) includes a first mounting plate (11) provided with a steering gear connection hole (3), and the first connecting plate (5) is connected to the first mounting plate (11).

8. The pitman arm of the vehicle steering gear according to claim 2, characterized in that The second vertical arm body (2) includes a second mounting plate (12) provided with a steering tie rod connection hole (4). The second mounting plate (12) is connected to a cross plate (13), the cross plate (13) is connected to an inclined plate (14), and the inclined plate (14) is connected to the second connecting plate (6).

9. The pitman arm of the vehicle steering gear according to claim 2, characterized in that, Five gaskets (7) are installed between the first connecting plate (5) and the second connecting plate (6), and the five gaskets (7) are stacked in sequence.

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