Salient point rubber bushing structure for steering engine

Abstract

The utility model relates to the technical field of steering systems, in particular to a bump rubber bushing structure for a steering engine. A bump rubber bushing structure for a steering engine comprises a rubber bushing and a metal inner tube, and is characterized in that the rubber bushing is sleeved on the outer side of the metal inner tube, and a plurality of bumps are uniformly distributed on the outer edge of the rubber bushing; the protruding points are of a semi-circular-arc-shaped protruding structure, and the protruding points and the rubber bushing are integrally formed in a vulcanized mode. A through hole is formed in the middle of the metal inner pipe, and the through hole is a round hole or a U-shaped hole. Compared with the prior art, the convex point rubber bushing structure for the steering engine has the advantages that the convex points are additionally arranged on the rubber, when the rubber collides with metal or other materials, the convex points are used for absorbing noise generated during collision, the outer diameter is increased, and the contact area is reduced, so that the rigidity is not greatly increased, and the service life of the steering engine is prolonged. A series of noise and falling problems caused by relative movement of rubber contraction at low temperature are solved.

Description

Technical Field

[0001] This utility model relates to the field of steering system technology, specifically to a convex rubber bushing structure for a steering gear. Background Technology

[0002] The electric power steering system is mounted on the vehicle subframe via rubber bushings, which improves the vibration damping performance of the steering system, reduces the transmission of road vibration excitation to the steering wheel, and thus improves driving comfort.

[0003] The rubber in the rubber bushing undergoes glassization at low temperatures (-40℃), resulting in some shrinkage. Normally, the outer surface of the rubber bushing is smooth, which leads to a gap between the rubber bushing and the metal shell after shrinkage. This causes relative movement between the two objects, resulting in the following four problems:

[0004] 1. Significant movement of the rubber bushing within the housing indicates low rigidity of the rubber bushing, which can cause a delay in steering feedback when the steering wheel is turned, affecting the steering function of the steering gear.

[0005] 2. Excessive movement of the rubber bushing within the housing will cause significant movement of the steering gear relative to the subframe, which in turn will cause significant movement of the power steering ball bearings in the steering gear, resulting in rattling or click noise at the power steering end.

[0006] 3. The rubber bushing moves significantly within the housing, and the friction between the rubber and the metal housing causes friction noise at the rubber bushing.

[0007] 4. If the rubber bushing of the steering gear falls off before it is installed on the subframe, it will affect the assembly of the whole vehicle and may even cause the steering gear to be scrapped.

[0008] Generally, the outer diameter of the rubber bushing is increased directly, thus increasing the interference fit between the rubber and the housing, to prevent gaps from forming even if the rubber shrinks at low temperatures. However, a crucial performance requirement for rubber bushings is stiffness, which is strongly correlated with the interference fit and contact area between the rubber and the housing. Directly increasing the outer diameter increases the interference fit without reducing the contact area, significantly increasing stiffness. While this may meet the interference fit and stiffness requirements at low temperatures, in most operating environments (0℃~100℃), the stiffness of the rubber bushing will increase dramatically, exceeding customer requirements and affecting the normal function of the steering gear. Currently, the common approach is to adjust the outer diameter during trial production to meet all temperature requirements. However, this significantly increases testing costs and carries the risk of failing to determine a suitable outer diameter. Summary of the Invention

[0009] To overcome the shortcomings of the prior art, this utility model provides a convex rubber bushing structure for steering gears. By increasing the convexity and the interference fit with the metal shell, the outer diameter is increased to ensure the interference at low temperatures without significantly increasing the rigidity.

[0010] To achieve the above objectives, a protruding rubber bushing structure for a steering gear is designed, comprising a rubber bushing and a metal inner tube. The structure is characterized in that: a rubber bushing is fitted around the outer side of the metal inner tube, and several protrusions are evenly distributed on the outer edge of the rubber bushing; the protrusions are semi-circular arc-shaped protrusions, and the protrusions and the rubber bushing are integrally formed by vulcanization; a through hole is provided in the middle of the metal inner tube, which is either a round hole or a U-shaped hole.

[0011] The rubber bushing is embedded in the metal housing, and the protrusion is located on the outer circumferential surface of the rubber bushing that is in contact with the metal housing.

[0012] The rubber bushing and the metal housing are interference fit.

[0013] The metal casing has a threaded groove inside, and some of the protrusions are stuck in the threaded groove.

[0014] A rubber bushing with a round-hole metal inner tube is installed in a mounting hole on one side of the metal housing, and a rubber bushing with a U-shaped hole metal inner tube is installed in a mounting hole on the other side of the metal housing.

[0015] Compared with the prior art, this utility model provides a convex rubber bushing structure for steering gear. By adding convex points to the rubber, the convex points can absorb the noise generated during the collision between the rubber and metal or other materials. While increasing the outer diameter, the contact area is reduced, so the stiffness is not greatly increased. This solves a series of noise and detachment problems caused by the relative motion of rubber shrinkage at low temperatures. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the rubber bushing structure.

[0018] Figure 3 This is a schematic diagram of a rubber bushing structure with a circular hole.

[0019] Figure 4 This is a schematic diagram of a rubber bushing structure with a U-shaped hole.

[0020] Figure 5 This is a schematic diagram of the interior of the metal casing.

[0021] Figure 6 This is a schematic diagram of a rubber bushing installed in a steering gear. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] like Figures 1 to 5 As shown, a rubber bushing 2 is fitted on the outer side of the metal inner tube 1, and several protrusions 2-1 are evenly distributed on the outer edge of the rubber bushing 2; the protrusions 2-1 are semi-circular arc protrusions, and the protrusions 2-1 and the rubber bushing 2 are vulcanized and integrally formed; the metal inner tube 1 has a through hole in the middle, which is a round hole or a U-shaped hole.

[0024] The rubber bushing 2 is embedded in the metal housing 3, and the protrusion 2-1 is located on the outer circumferential surface of the rubber bushing 2 that is in contact with the metal housing 3.

[0025] The rubber bushing 2 and the metal housing 3 are interference fit.

[0026] The metal casing 3 has a threaded groove 3-1 inside, and a portion of the protrusions 2-1 are engaged in the threaded groove 3-1.

[0027] A rubber bushing with a round hole metal inner tube is installed in a mounting hole on one side of the metal housing 3, and a rubber bushing with a U-shaped hole metal inner tube is installed in a mounting hole on the other side of the metal housing 3.

[0028] A raised dot 2-1 is added to the surface of the original rubber bushing 2 to increase the outer diameter within a small range. The raised dot 2-1 is part of the rubber bushing 2, and the two are vulcanized together. A threaded groove 3-1 is added to the inside of the metal shell 3. The connection holes that match the rubber bushing 2 and the metal inner tube 1 are designed as a round hole and a U-shaped hole, which are installed in different mounting holes of the metal shell 3 for matching use.

[0029] The advantages of this utility model are:

[0030] 1. The outer diameter of the rubber bushing is increased by using a raised dot design. The contact area between the raised dot and the metal shell is small, which does not greatly increase the rigidity of the rubber.

[0031] 2. In low-temperature environments (-40℃), the presence of the protrusions effectively increases the interference with the metal shell, preventing relative movement and ensuring that the rubber bushing does not fall off or generate rattling or clicking noise.

[0032] 3. The design of adding a threaded groove inside the metal shell, since the thread is inclined, allows some of the protrusions to be stuck in the threaded groove, further reducing the contact area and rigidity, and can also enhance the connection between the rubber and the shell, further reducing the risk of detachment.

[0033] 4. Design the inner hole of the rubber bushing as one round hole and one U-shaped hole, which are installed in different mounting holes on the metal housing of the same steering gear for matching use, thereby reducing the need to design multiple rubber bushings.

[0034] 5. The added bumps are part of the rubber and can be produced using existing mature equipment without increasing the unit cost.

Claims

1. A convex rubber bushing structure for a steering gear, comprising a rubber bushing and a metal inner tube, characterized in that: A rubber bushing (2) is fitted on the outer side of the metal inner tube (1), and several protrusions (2-1) are evenly distributed on the outer edge of the rubber bushing (2); the protrusions (2-1) are semi-circular arc protrusions, and the protrusions (2-1) and the rubber bushing (2) are vulcanized and integrally formed; the metal inner tube (1) is provided with a through hole in the middle, which is a round hole or a U-shaped hole.

2. The convex rubber bushing structure for a steering gear according to claim 1, characterized in that: The rubber bushing (2) is embedded in the metal shell (3), and the protrusion (2-1) is located on the outer circumferential surface of the rubber bushing (2) that is in contact with the metal shell (3).

3. A convex rubber bushing structure for a steering gear according to claim 1 or 2, characterized in that: The rubber bushing (2) and the metal housing (3) are interference fit.

4. A convex rubber bushing structure for a steering gear according to claim 2 or 3, characterized in that: The metal casing (3) has a threaded groove (3-1) inside, and a portion of the protrusions (2-1) are stuck in the threaded groove (3-1).

5. The convex rubber bushing structure for a steering gear according to claim 1, characterized in that: A rubber bushing with a round hole metal inner tube is installed in a mounting hole on one side of the metal housing (3), and a rubber bushing with a U-shaped hole metal inner tube is installed in a mounting hole on the other side of the metal housing (3).

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