A steering gear housing anti-rattling inner bushing

Abstract

The utility model provides a kind of inner bushing of steering gear guard against abnormal sound, belong to the technical field of automobile steering gear, the inner bushing of steering gear guard against abnormal sound has steering gear, steering transmission shaft, steering column and steering gear guard, it is characterized in that, two circular clamping grooves are set in the inner wall of the lower end of steering gear guard, inner bushing is installed in steering gear guard, inner bushing is nylon material, inner bushing is set in the outside of steering transmission shaft, the inside of inner bushing is set with arc, and contact with steering transmission shaft line;The utility model is used to solve the technical problem that the abnormal sound of existing steering gear guard can be caused in the process of steering vehicle.

Description

Technical Field

[0001] This utility model belongs to the field of automotive steering system technology, specifically, it relates to a steering system cover anti-noise inner liner. Background Technology

[0002] When a vehicle is making a steering motion, one end of the steering gear cover is fixed to the front of the vehicle body, and the other end has a steering drive shaft passing through it. Currently, most steering gear covers are made of rubber, which deforms upon contact, causing some parts to press tightly against the drive shaft. This results in excessive friction between some rubber surfaces and the drive shaft, causing abnormal noises during steering and affecting the driving experience. Utility Model Content

[0003] This utility model provides a steering gear cover anti-noise inner liner to solve the technical problem that existing steering gear covers cause abnormal noises during vehicle steering.

[0004] This utility model is implemented as follows:

[0005] This utility model provides a steering gear cover anti-noise inner bushing, which includes a steering gear, a steering drive shaft, a steering column, and a steering gear cover. The steering gear cover has two annular grooves on its lower inner wall. An inner bushing made of nylon is installed inside the steering gear cover. The inner bushing is fitted over the steering drive shaft and has an arc-shaped interior that contacts the steering drive shaft.

[0006] Based on the above technical solution, the steering gear cover anti-noise inner bushing of this utility model can be further improved as follows:

[0007] Furthermore, the inner hole of the inner bushing has an arc-shaped structure, which includes an upper sloping segment, an arc segment, a lower sloping segment, and a lower straight segment from top to bottom. The diameter of the upper sloping segment gradually decreases from top to bottom, and the diameter of the lower sloping segment gradually increases from top to bottom. The upper and lower ends of the arc segment are connected to the upper sloping segment and the lower sloping segment, respectively, and the inner diameter of the middle part is the smallest. The diameter of the lower straight segment is the same as the inner diameter of the bottom end of the lower sloping segment.

[0008] Furthermore, the upper end of the outer peripheral surface of the inner liner has a circular retaining ring A, and the middle part of the outer peripheral surface of the inner liner has a circular retaining ring B, and the retaining ring A and the retaining ring B are respectively engaged in the corresponding retaining grooves.

[0009] Furthermore, the lower straight section of the inner bushing forms a cylindrical surface, with a gap of 0.5mm between it and the steering drive shaft.

[0010] Furthermore, there is an interference fit of 0.1 mm between the arc segment of the inner bushing and the steering drive shaft.

[0011] Furthermore, there is an interference fit of 0.5-1mm between the diameter of the inner bushing and the steering gear cover.

[0012] Compared with the prior art, the beneficial effects of the steering gear cover anti-noise inner liner provided by this utility model are:

[0013] By designing the steering drive shaft and inner bushing to form a line contact, the contact area is reduced, thus minimizing rotational noise. A retaining ring A is added to the outer circumference of the inner bushing, allowing it to be secured in the steering gear cover and preventing it from falling off during operation. The inner bushing has a low structural cost, is easy to mass-produce, and is convenient to replace. When the inner bushing wears out, only the inner bushing needs to be replaced; there is no need to replace the steering drive shaft, steering gear cover, etc., thereby reducing replacement costs. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 A cross-sectional view of the inner bushing being snapped into the steering gear cover;

[0016] Figure 2 This is the front view of the inner liner;

[0017] Figure 3 This is a sectional view of the inner liner;

[0018] Figure 4 This is a cross-sectional view of the steering gear guard;

[0019] Figure 5 This is a schematic diagram of the steering gear and its connected structure.

[0020] The attached diagram lists the components represented by each number as follows:

[0021] 1. Steering gear; 11. Steering drive shaft; 12. Steering column; 13. Steering gear cover; 14. Slot; 2. Inner bushing; 21. Upper sloping segment; 22. Arc segment; 23. Lower sloping segment; 24. Lower straight segment; 31. Snap ring A; 32. Snap ring B. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are 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 are not intended to indicate or imply that the device or component 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.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] Example 1

[0028] like Figure 1-5As shown, this utility model provides a steering gear cover anti-noise inner bushing, which has a steering gear 1, a steering drive shaft 11, a steering column 12 and a steering gear cover 13. The steering gear cover 13 has two annular grooves 14 on the inner wall at the lower end. An inner bushing 2 is installed inside the steering gear cover 13. The inner bushing 2 is made of nylon and is fitted outside the steering drive shaft 11. The inner bushing 2 is arc-shaped inside and makes line contact with the steering drive shaft 11.

[0029] Optionally, in the above technical solution, the inner hole of the inner bushing 2 has an arc-shaped structure, which includes an upper inclined line segment 21, an arc segment 22, a lower inclined line segment 23 and a lower straight line segment 24 from top to bottom. The diameter of the upper inclined line segment 21 gradually decreases from top to bottom, and the diameter of the lower inclined line segment 23 gradually increases from top to bottom. The upper and lower ends of the arc segment 22 are connected to the upper inclined line segment 21 and the lower inclined line segment 23 respectively, and the inner diameter of the middle part is the smallest. The diameter of the lower straight line segment 24 is consistent with the inner diameter of the bottom end of the lower inclined line segment 23.

[0030] Optionally, in the above technical solution, the upper end of the outer peripheral surface of the inner bushing 2 has a circular retaining ring A31, and the middle part of the outer peripheral surface of the inner bushing 2 has a circular retaining ring B32. The retaining ring A31 and the retaining ring B32 are respectively engaged in the corresponding retaining groove 14.

[0031] Optionally, in the above technical solution, the lower straight section 24 of the inner bushing 2 forms a cylindrical surface, with a gap size of 0.5mm between it and the steering drive shaft 11.

[0032] Optionally, in the above technical solution, there is an interference fit of 0.1mm between the arc segment 22 of the inner bushing 2 and the steering drive shaft 11.

[0033] Optionally, in the above technical solution, there is an interference fit of 0.5-1mm between the diameter of the inner bushing 2 and the steering gear cover 13.

[0034] Furthermore, the outer circumference of the inner liner 2 is rounded at all bends.

[0035] Furthermore, the retaining ring A31 and the inner liner 2 are integrally formed.

[0036] Furthermore, the diameter of the top of the upward sloping line segment 21 is greater than the diameter of the downward straight line segment 24.

[0037] The lower straight section 24 has a gap of 0.5mm on one side with the steering drive shaft 11. This design is to allow for smoother assembly in case the steering shaft has burrs or other issues during actual assembly.

[0038] The inner bushing 2 has an interference fit of 0.1mm with the steering drive shaft 11, which ensures the sealing performance of the steering system.

[0039] To prevent the nylon sleeve from rotating with the steering shaft during rotation, there is an interference fit of 0.5-1mm between the nylon sleeve and the sheath in this design (the part of arc segment 22 and the part where the upper sloping segment 21 and the lower sloping segment 23 are connected to the arc segment 22). This will ensure that the nylon sleeve and the sheath form a stable fit and prevent relative rotation.

[0040] like Figure 3 Point A represents an upward sloping line segment 21, point B represents an arc segment 22, point C represents a downward sloping line segment 23, and point D represents a downward straight line segment 24.

[0041] The upper end of the steering drive shaft 11 is fixed to the steering column 12 by bolts, and the lower end is fixed to the universal joint by bolts, and then connected to the steering gear 1 to realize the steering process; when the steering drive shaft 11 passes through the front bulkhead of the vehicle body, it needs to pass through the slot 14 to maintain the seal. Now the contact surface is fitted with an inner bushing 2 to achieve the purpose of preventing abnormal noise in the design structure.

[0042] The inner bushing 2 is in direct contact with the steering drive shaft 11 of the steering system. During steering operation, the steering gear cover 13 will move in a relative manner such as extension, rotation and extension with the steering action. The nylon inner bushing 2 can replace the steering gear cover 13 body (mostly made of materials with poor wear resistance such as rubber) to contact the moving parts (at the steering drive shaft 11). Relying on the excellent self-lubricating properties and low coefficient of friction of nylon material, the frictional resistance is greatly reduced, the cover is prevented from being worn or torn due to long-term friction, the cover life is extended, and the wear on the moving parts is reduced, protecting the precision of the mating surfaces.

[0043] During the steering process, the steering gear cover 13 needs to make stable extension or deflection movements with the steering components. The inner bushing 2, through precise size design, can guide and limit the movement trajectory of the steering gear cover 13, prevent the steering gear cover 13 from deviating, twisting or getting stuck during movement, ensure that it always moves smoothly along the preset path, and avoid sealing failure or transmission interference caused by cover deformation.

[0044] When there is a steering vibration or impact, due to the elasticity and toughness of the nylon material, the inner bushing 2 can absorb some of the vibration energy through slight deformation, reduce the rigid collision or high-frequency friction noise between the steering gear cover 13 and the moving parts (steering drive shaft 11), and at the same time reduce the transmission of vibration to the cockpit, thereby improving the quietness and comfort of steering operation.

[0045] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A steering gear cover anti-noise inner bushing, comprising a steering gear (1), a steering drive shaft (11), a steering column (12), and a steering gear cover (13), characterized in that, Two annular slots (14) are provided on the lower inner wall of the steering gear cover (13). An inner bushing (2) is installed inside the steering gear cover (13). The inner bushing (2) is made of nylon and is fitted on the outside of the steering drive shaft (11). The inside of the inner bushing (2) is arc-shaped and in line contact with the steering drive shaft (11).

2. The steering gear cover anti-noise inner liner according to claim 1, characterized in that, The inner hole of the inner bushing (2) has an arc-shaped structure, which includes an upper inclined line segment (21), an arc segment (22), a lower inclined line segment (23), and a lower straight line segment (24) from top to bottom. The diameter of the upper inclined line segment (21) gradually decreases from top to bottom, and the diameter of the lower inclined line segment (23) gradually increases from top to bottom. The upper and lower ends of the arc segment (22) are connected to the upper inclined line segment (21) and the lower inclined line segment (23) respectively, and the inner diameter of the middle part is the smallest. The diameter of the lower straight line segment (24) is the same as the inner diameter of the bottom end of the lower inclined line segment (23).

3. The steering gear cover anti-noise inner liner according to claim 1, characterized in that, The upper end of the outer peripheral surface of the inner liner (2) has a circular retaining ring A (31), and the middle part of the outer peripheral surface of the inner liner (2) has a circular retaining ring B (32). The retaining ring A (31) and the retaining ring B (32) are respectively engaged in the corresponding retaining groove (14).

4. The steering gear cover anti-noise inner liner according to claim 1, characterized in that, The lower straight section (24) of the inner bushing (2) forms a cylindrical surface, with a clearance of 0.5 mm between it and the steering drive shaft (11).

5. The steering gear cover anti-noise inner liner according to claim 1, characterized in that, There is an interference fit of 0.1 mm between the arc segment (22) of the inner bushing (2) and the steering drive shaft (11).

6. The steering gear cover anti-noise inner liner according to claim 1, characterized in that, There is an interference fit of 0.5-1mm between the diameter of the inner bushing (2) and the steering gear cover (13).

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