Sensor cover and input shaft matching structure capable of preventing axial separation

Abstract

The utility model relates to the technical field of steering machines, in particular to a sensor cover and input shaft matching structure capable of preventing axial disengagement, which comprises a sensor cover, an input shaft and a shaft seal, a circle of trapezoidal boss is arranged in the middle of the inner wall of the sensor cover, the trapezoidal boss is positioned above the shaft seal, and the upper end face of the trapezoidal boss is a plane. The lower end face of the trapezoid boss is an inclined face, the inclination angle of the inclined face is matched with the angle of the variable-diameter inclined face, an inner ring of the trapezoid boss is a vertical face, and the diameter of the inner ring of the trapezoid boss is larger than the diameter of the upper end of the input shaft and smaller than the diameter of the lower end of the input shaft. Compared with the prior art, the input shaft is prevented from being disengaged due to breakage of a torsion bar or a gear, the risk of steering failure caused by disengagement of the input shaft is reduced, and meanwhile assembly of the input shaft is not affected; the trapezoidal boss can be better attached to the lower end face of the input shaft, the situation that the input shaft is broken due to stress concentration in the collision process is avoided, meanwhile, stress of the trapezoidal boss is more dispersed, and the service life of the sensor cover is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of steering gears, in particular to a sensor cover and input shaft matching structure that prevents axial disengagement. Background Art

[0002] The sensor cover is connected to the steering gear housing and the sealing cap, and mainly plays the functions of connection, sealing, fixing and protection.

[0003] The sensor cover mainly includes a double O-ring structure, a wiring harness platform, and a slot structure. The double O-ring structure is locked with the housing by screws to ensure the sealing between the housing and the sensor cover; at the same time, the shaft seal and the sensor cover are interference-fitted and matched with the input shaft to ensure the sealing between the input shaft and the shaft seal, and between the shaft seal and the sensor cover, so as to achieve the effect of waterproofing and anti-dirt and protecting the sensor. The wiring harness platform is locked by bolts to fix the wiring harness. The slot structure is connected to the sealing cap, and the sealing cap is connected to the front panel of the vehicle to prevent water and dirt from seeping from the lower part of the steering gear into the front panel during daily driving, wading and muddy roads.

[0004] The middle of the sensor cover only has clearance with the input shaft, and there is no other rigid structure between the two. When the torsion bar or gear breaks, the input shaft, the shaft seal and the sensor may come out together, causing steering failure.

[0005] Therefore, it is necessary to design a sensor cover and input shaft matching structure that can prevent axial disengagement, so as to reduce the risk of steering failure caused by input shaft disengagement. Summary of the invention

[0006] The utility model aims to overcome the deficiencies of the prior art and provides a sensor cover and input shaft matching structure that prevents axial disengagement, thereby reducing the risk of steering failure caused by input shaft disengagement.

[0007] In order to achieve the above-mentioned purpose, the utility model is a sensor cover and input shaft matching structure for preventing axial disengagement, comprising a sensor cover, an input shaft, and a shaft seal. The input shaft passes through the cavity of the sensor cover, and a reducing bevel is provided in the middle of the input shaft. The reducing bevel connects the upper end and the lower end of the input shaft. The lower end of the input shaft and the sensor cover are connected by a shaft seal. A circle of trapezoidal bosses is provided in the middle of the inner wall of the sensor cover. The trapezoidal bosses are located above the shaft seal. The upper end face of the trapezoidal bosses is a plane, and the lower end face of the trapezoidal bosses is a bevel. The inclination angle of the bevel matches the angle of the reducing bevel. The inner ring of the trapezoidal boss is a vertical surface. The inner ring diameter of the trapezoidal boss is larger than the upper end diameter of the input shaft and smaller than the lower end diameter of the input shaft.

[0008] The lower end of the sensor cover is fixed to the housing by two bolts, and the end of the input shaft is exposed at the upper end of the sensor cover.

[0009] The upper end diameter of the input shaft is smaller than the lower end diameter of the input shaft.

[0010] The cross section of the trapezoidal boss is a right-angled trapezoid.

[0011] The inclined plane angle of the trapezoidal boss is greater than or equal to the angle of the diameter-changing inclined plane and less than or equal to 90°.

[0012] The upper end of the sensor cover is provided with a draft angle of 2°.

[0013] The upper end of the sensor cover is the portion of the sensor cover located above the shaft seal.

[0014] The sensor cover and the trapezoidal boss are an integrated structure.

[0015] Compared with the prior art, the utility model adds a trapezoidal boss in the middle of the sensor cover and above the shaft seal, so as to prevent the input shaft from coming out due to the breakage of the torsion bar or the gear, reduce the risk of steering failure caused by the input shaft coming out, and do not affect the assembly of the input shaft; the trapezoidal boss can better fit the lower end face of the input shaft, so as to prevent the input shaft from breaking due to stress concentration during the collision, and at the same time, the force on the trapezoidal boss is more dispersed, so as to ensure the service life of the sensor cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the external structure of the sensor cover, housing and input shaft of the utility model.

[0017] Figure 2 It is a cross-sectional view of the sensor cover and the input shaft of the utility model. DETAILED DESCRIPTION

[0018] The utility model is now further described with reference to the accompanying drawings.

[0019] See also Figure 1 , Figure 2 The utility model is a sensor cover and input shaft matching structure for preventing axial disengagement, comprising a sensor cover, an input shaft, and a shaft seal. The input shaft 2 passes through the cavity of the sensor cover 1. A reducing bevel 21 is provided in the middle of the input shaft 2. The reducing bevel 21 connects the upper end and the lower end of the input shaft 2. The lower end of the input shaft 2 is connected to the sensor cover 1 by a shaft seal 6. The shaft seal 6 plays a sealing role. A circle of trapezoidal bosses 5 are provided in the middle of the inner wall of the sensor cover 1. The trapezoidal bosses 5 are located above the shaft seal 6.

[0020] The upper end surface of the trapezoidal boss 5 is a plane to ensure the spacing between the sensor cover 1 and the input shaft 2. The lower end surface of the trapezoidal boss 5 is an inclined surface. The inclination angle of the inclined surface matches the angle of the diameter-changing inclined surface 21. The inclined surface angle of the trapezoidal boss 5 is greater than or equal to the angle of the diameter-changing inclined surface 21 and less than or equal to 90°. The inner circle of the trapezoidal boss 5 is a vertical surface. The inner circle diameter of the trapezoidal boss 5 is greater than the upper end diameter of the input shaft 2 and smaller than the lower end diameter of the input shaft 2. In this way, it can not only prevent the input shaft 2 from coming out, but also does not affect demoulding.

[0021] See also Figure 1 The lower end of the sensor cover 1 is fixed to the housing 3 by two bolts 4 , and the end of the input shaft 2 is exposed at the upper end of the sensor cover 1 .

[0022] The diameter of the upper end of the input shaft 2 is smaller than the diameter of the lower end of the input shaft 2, so that a gap is maintained between the upper end of the input shaft 2 and the inner wall of the sensor cover 1 to avoid abnormal noise caused by collision.

[0023] In order to disperse the force more, the cross section of the trapezoidal boss 5 is a right-angled trapezoid.

[0024] The upper end of the sensor cover 1 is the portion of the sensor cover 1 located above the shaft seal 6. The upper end of the sensor cover 1 is provided with a draft angle of 2° to facilitate better demoulding.

[0025] The sensor cover 1 and the trapezoidal boss 5 are an integrated structure, which is convenient for demolding, and the trapezoidal boss structure is more friendly to the service life of the mold, does not add unnecessary processes and materials, and effectively controls the cost.

[0026] In the utility model, when the torsion bar or the gear is broken, the trapezoidal boss will block the diameter-changing inclined surface 21 of the input shaft 2 , thereby preventing the input shaft 2 from being entirely disengaged from the sensor cover 1 .

[0027] The utility model adds a trapezoidal boss in the middle of the sensor cover and above the shaft seal to prevent the input shaft from coming out due to the breakage of the torsion bar or the gear, reduce the risk of steering failure due to the input shaft coming out, and do not affect the assembly of the input shaft; the trapezoidal boss can better fit the lower end face of the input shaft, to prevent the input shaft from breaking due to stress concentration during a collision, and at the same time the force on the trapezoidal boss is more dispersed, thereby ensuring the service life of the sensor cover.

Claims

1. A sensor cover and input shaft matching structure for preventing axial disengagement, comprising a sensor cover, an input shaft, and a shaft seal, wherein the input shaft (2) passes through a cavity of the sensor cover (1), a reducing bevel (21) is provided in the middle of the input shaft (2), the reducing bevel (21) connects the upper end and the lower end of the input shaft (2), and a shaft seal (6) is used to connect the lower end of the input shaft (2) and the sensor cover (1), wherein the characteristics are: A circle of trapezoidal bosses (5) is provided in the middle of the inner wall of the sensor cover (1). The trapezoidal bosses (5) are located above the shaft seal (6). The upper end surface of the trapezoidal bosses (5) is a plane, and the lower end surface of the trapezoidal bosses (5) is an inclined surface. The inclination angle of the inclined surface matches the angle of the variable diameter inclined surface (21). The inner circle of the trapezoidal bosses (5) is a vertical surface. The inner circle diameter of the trapezoidal bosses (5) is larger than the upper end diameter of the input shaft (2) and smaller than the lower end diameter of the input shaft (2).

2. The sensor cover and input shaft matching structure for preventing axial disengagement according to claim 1, characterized in that: The lower end of the sensor cover (1) is fixed to the housing (3) by two bolts (4), and the end of the input shaft (2) is exposed at the upper end of the sensor cover (1).

3. The sensor cover and input shaft matching structure for preventing axial disengagement according to claim 1, characterized in that: The diameter of the upper end of the input shaft (2) is smaller than the diameter of the lower end of the input shaft (2).

4. The sensor cover and input shaft matching structure for preventing axial disengagement according to claim 1, characterized in that: The cross section of the trapezoidal boss (5) is a right-angled trapezoid.

5. The sensor cover and input shaft matching structure for preventing axial disengagement according to claim 1, characterized in that: The inclined surface angle of the trapezoidal boss (5) is greater than or equal to the angle of the diameter-changing inclined surface (21) and less than or equal to 90°.

6. The sensor cover and input shaft matching structure for preventing axial disengagement according to claim 1, characterized in that: The upper end of the sensor cover (1) is provided with a draft angle of 2°.

7. The sensor cover and input shaft matching structure for preventing axial disengagement according to claim 6, characterized in that: The upper end of the sensor cover (1) is the portion of the sensor cover (1) located above the shaft seal (6).

8. The sensor cover and input shaft matching structure for preventing axial disengagement according to claim 1, characterized in that: The sensor cover (1) and the trapezoidal boss (5) are an integrated structure.

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