Dustproof device for steering gear

Abstract

The dustproof device comprises an end cover, a first dustproof cover and an input shaft, one end of the input shaft is located in the end cover, the other end of the input shaft sequentially penetrates through the end cover and the first dustproof cover and extends out of the first dustproof cover, and the first dustproof cover is relatively and fixedly connected with the input shaft. An outer spline is arranged on the peripheral wall of the input shaft, and an inner spline in interference fit with the outer spline is arranged on the first dustproof cover; the input shaft is further provided with a second dustproof cover, the inner circumferential wall of one end of the second dustproof cover is connected with the outer wall of the end cover in an interference fit mode, the other end of the second dustproof cover is connected with the input shaft in a matched mode, and the second dustproof cover is located between the end cover and the first dustproof cover. The first dustproof cover can effectively prevent dust, slurry, pebbles and other sundries and rainwater from directly entering the steering gear, and when a vehicle runs in the direction, the first dustproof cover can prevent slurry and muddy water from being brought into the electro-hydraulic steering gear along with rotation of the input shaft.

Description

Technical Field

[0001] The utility model relates to the technical field of dust prevention for steering gears, in particular to a dust prevention device for steering gears. Background Art

[0002] The function of the steering gear is to appropriately transform the steering torque and steering angle from the steering wheel (mainly deceleration and torque increase), and then output it to the steering rod mechanism to make the car turn, so the steering gear is essentially a deceleration transmission device. There are many types of steering gears, such as rack and pinion type, recirculating ball type, worm crank pin type, power steering gear, etc. The input end of the existing steering gear is protected by an end cover to prevent dust, mud, pebbles and other debris on the road from directly entering the steering gear, but dust, mud and rain will still adhere to the surface of the end cover. When the vehicle is driving and turning, mud and muddy water will be brought into the electro-hydraulic steering gear as the input shaft rotates, causing electronic components such as sensors to fail, resulting in electro-hydraulic steering gear failure. Utility Model Content

[0003] In view of the above problems, the utility model proposes a dustproof device for a steering gear. When a vehicle is turning during driving, a first dustproof cover can prevent mud and muddy water from being brought into the electro-hydraulic steering gear as the input shaft rotates.

[0004] The technical solution adopted by the utility model is as follows: a steering gear dustproof device, comprising an end cover, a first dust cover and an input shaft, one end of the input shaft is located inside the end cover, and the other end of the input shaft passes through the end cover and the first dust cover in sequence and extends outside the first dust cover, and the first dust cover is relatively fixedly connected to the input shaft.

[0005] Optionally, the outer peripheral wall of the input shaft is provided with an external spline, and the first dust cover is provided with an internal spline that is interference fit with the external spline.

[0006] Optionally, a second dust cover is further provided on the input shaft, wherein the inner circumferential wall of one end of the second dust cover is interference fit connected with the outer wall of the end cover, the other end of the second dust cover is cooperatedly connected with the input shaft, and the second dust cover is located between the end cover and the first dust cover.

[0007] Optionally, the end cover is provided with a limiting groove, the inner wall of the second dust cover is provided with a limiting protrusion that cooperates with the limiting groove, and the inner circumferential wall and the outer circumferential wall of the second dust cover are both made of flexible material.

[0008] Optionally, a first protrusion and a second protrusion are provided at one end of the second dust cover away from the limiting protrusion, the first protrusion and the second protrusion are respectively interference fit with the input shaft, a first oil groove is provided between the first protrusion and the second protrusion, and the first oil groove is filled with grease.

[0009] Optionally, the first dust cover is provided with a cavity for accommodating the second dust cover.

[0010] Optionally, an oil seal is provided between the end cover and the input shaft, one end of the oil seal is interference fit with the inner wall of the end cover, and the other end of the oil seal is cooperatively connected with the input shaft.

[0011] Optionally, the oil seal is provided with a third protrusion and a fourth protrusion, the third protrusion and the fourth protrusion are respectively interference fit with the input shaft, a second oil groove is provided between the third protrusion and the fourth protrusion, and the second oil groove is filled with grease.

[0012] Optionally, an arc-shaped groove is provided on a side of the third protrusion facing away from the input shaft, and a spring is installed in the arc-shaped groove.

[0013] Optionally, the material of the areas where the input shaft contacts the second dust cover and the oil seal is electroplated zinc-nickel alloy.

[0014] The beneficial effect of the utility model is that the first dust cover is fixedly connected to the input shaft, and when the vehicle is turning during driving, the first dust cover can prevent mud and muddy water from being brought into the electro-hydraulic steering gear as the input shaft rotates. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of the dust-proof device for the steering gear proposed in the embodiment of the utility model;

[0016] Figure 2 for Figure 1 Schematic diagram of A in the middle;

[0017] Figure 3 A schematic diagram of a second dust cover of the steering gear dust protection device according to an embodiment of the present utility model;

[0018] Figure 4 A schematic diagram of the oil seal of the steering gear dust prevention device proposed in an embodiment of the utility model.

[0019] The marks in the accompanying drawings are: 1. end cover; 11. limiting groove; 2. first dust cover; 21. accommodating cavity; 3. input shaft; 4. second dust cover; 41. limiting convex; 42. first convex portion; 43. second convex portion; 44. first oil groove; 5. oil seal; 51. third convex portion; 52. fourth convex portion; 53. second oil groove; 6. grease; 7. spring. DETAILED DESCRIPTION

[0020] The utility model is described in detail below in conjunction with the accompanying drawings.

[0021] like Figure 1As shown, a dustproof device for a steering gear comprises an end cover 1, a first dust cover 2 and an input shaft 3, one end of the input shaft 3 is located inside the end cover 1, the other end of the input shaft 3 passes through the end cover 1 and the first dust cover 2 in sequence and extends outside the first dust cover 2, and the first dust cover 2 is relatively fixedly connected to the input shaft 3. The first dust cover 2 can effectively prevent dust, mud, pebbles and other debris and rainwater from directly entering the interior of the steering gear, and when the vehicle is turning, the first dust cover 2 can prevent mud and muddy water from being brought into the interior of the electro-hydraulic steering gear as the input shaft 3 rotates.

[0022] In this embodiment, if Figure 1 As shown, the outer peripheral wall of the input shaft 3 is provided with an external spline, and the first dust cover 2 is provided with an internal spline that is interference fit with the external spline. The first dust cover 2 and the input shaft 3 are pressed into each other through the interference fit of the external spline and the internal spline, so that the first dust cover 2 and the input shaft 3 are fixedly connected.

[0023] In this embodiment, if Figure 1 As shown, a second dust cover 4 is also provided on the input shaft 3, the inner peripheral wall of one end of the second dust cover 4 is connected with the outer wall of the end cover 1 by interference fit, the other end of the second dust cover 4 is connected with the input shaft 3 by matching, and the second dust cover 4 is located between the end cover 1 and the first dust cover 2. The second dust cover 4 plays a further role in dust prevention.

[0024] In this embodiment, if Figure 2 As shown, the end cover 1 is provided with a limiting groove 11, and the inner wall of the second dust cover 4 is provided with a limiting protrusion 41 that matches the limiting groove 11. The inner and outer walls of the second dust cover 4 are both made of flexible materials. A keel is provided inside the material of the second dust cover 4, and a flexible material is wrapped around the outer wall of the keel. The flexible material can be rubber or silicone. The inner wall of the second dust cover 4 is interference fit with the outer wall of the end cover 1. The interference fit generates tension inside the second dust cover 4. The tension forces the flexible material of the inner wall of the second dust cover 4 into the limiting groove 11 of the end cover 1, thereby strengthening the axial fixation of the second dust cover 4 and preventing it from falling off. A first protrusion 42 and a second protrusion 43 are provided at one end of the second dust cover 4 away from the limiting protrusion 41. The first protrusion 42 and the second protrusion 43 are respectively interference fit with the input shaft 3. A first oil groove 44 is provided between the first protrusion 42 and the second protrusion 43, and the first oil groove 44 is filled with grease 6. The grease 6 not only plays a lubricating role, but also can prevent mud, sand and dust from entering the interior of the steering gear to enhance the sealing performance.

[0025] In this embodiment, if Figure 1 As shown, the first dust cover 2 is provided with a cavity 21 for accommodating the second dust cover 4 .

[0026] In this embodiment, if Figure 1 and 4As shown, an oil seal 5 is provided between the end cover 1 and the input shaft 3, one end of the oil seal 5 is interference fit with the inner wall of the end cover 1, and the other end of the oil seal 5 is connected with the input shaft 3. The oil seal 5 is provided with a third convex portion 51 and a fourth convex portion 52, the third convex portion 51 and the fourth convex portion 52 are respectively interference fit with the input shaft 3, a second oil groove 53 is provided between the third convex portion 51 and the fourth convex portion 52, and the second oil groove 53 is filled with grease 6.

[0027] In this embodiment, if Figure 1 As shown, the third convex portion 51 is provided with an arc groove on one side away from the input shaft 3, and a spring 7 is installed in the arc groove. The spring 7 is sleeved in the arc groove to achieve a self-tightening function to ensure that it will not loosen, which is a prior art.

[0028] In this embodiment, the material of the contact area between the input shaft 3 and the second dust cover 4 and the oil seal 5 is electroplated zinc-nickel alloy. The electroplating zinc-nickel alloy process improves the corrosion resistance of the mating surface of the input shaft 3, prevents the sealing performance from being reduced due to corrosion and rust of the input shaft 3, and thus ensures the service life of the oil seal 5.

[0029] The above description is only a preferred embodiment of the utility model, and does not limit the patent protection scope of the utility model. Any equivalent structural transformation made using the contents of the utility model specification and drawings, directly or indirectly used in other related technical fields, is also included in the protection scope of the utility model.

Claims

1. A dust-proof device for a steering gear, characterized in that: It includes an end cover, a first dust cover and an input shaft, wherein one end of the input shaft is located inside the end cover, and the other end of the input shaft passes through the end cover and the first dust cover in sequence and extends outside the first dust cover, and the first dust cover is relatively fixedly connected to the input shaft; The outer peripheral wall of the input shaft is provided with an external spline, and the first dust cover is provided with an internal spline which is interference fit with the external spline; The input shaft is also provided with a second dust cover, the inner peripheral wall of one end of the second dust cover is connected with the outer wall of the end cover by interference fit, the other end of the second dust cover is connected with the input shaft by matching, and the second dust cover is located between the end cover and the first dust cover; The end cover is provided with a limiting groove, the inner wall of the second dust cover is provided with a limiting protrusion matched with the limiting groove, and the inner peripheral wall and the outer peripheral wall of the second dust cover are both made of flexible material.

2. The steering gear dust prevention device according to claim 1, characterized in that: The second dust cover is provided with a first convex portion and a second convex portion at one end away from the limiting convex portion. The first convex portion and the second convex portion are respectively interference fit with the input shaft. A first oil groove is provided between the first convex portion and the second convex portion. The first oil groove is filled with grease.

3. The steering gear dust prevention device according to claim 1, characterized in that: The first dust cover is provided with a cavity for accommodating the second dust cover.

4. The dust-proof device for a steering gear according to claim 1, characterized in that: An oil seal is arranged between the end cover and the input shaft, one end of the oil seal is interference fit with the inner wall of the end cover, and the other end of the oil seal is matched and connected with the input shaft.

5. The dust-proof device for a steering gear according to claim 4, characterized in that: The oil seal is provided with a third convex portion and a fourth convex portion, the third convex portion and the fourth convex portion are respectively interference fit with the input shaft, a second oil groove is provided between the third convex portion and the fourth convex portion, and the second oil groove is filled with grease.

6. The dust-proof device for a steering gear according to claim 5, characterized in that: An arc-shaped groove is provided on a side of the third convex portion facing away from the input shaft, and a spring is installed in the arc-shaped groove.

7. The dust-proof device for a steering gear according to claim 4, characterized in that: The material of the areas where the input shaft contacts the second dust cover and the oil seal is electroplated zinc-nickel alloy.

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