A dustproof and waterproof structure for steering gear input shaft

Abstract

The utility model discloses a dustproof and waterproof structure for a steering gear input shaft, comprising an input shaft, an input shaft dustproof oil seal sleeved on the input shaft, a valve body for positioning the input shaft, an upper cover nut arranged on the valve body, and an input shaft oil seal arranged inside the input shaft dustproof oil seal, wherein the input shaft dustproof oil seal comprises a static seal and a dynamic seal mechanism, wherein the static seal portion is close to the shaft neck of the input shaft, the dynamic seal portion is far away from the shaft neck of the input shaft, the dynamic seal adopts a labyrinth seal structure design, and the static seal portion is arranged at the inner hole portion of the input shaft dustproof oil seal. Due to the adoption of static seal and dynamic seal, the static seal portion is close to the shaft neck of the input shaft, the dynamic seal portion is far away from the shaft neck of the input shaft, and the labyrinth seal structure design is adopted for the dynamic seal, the input shaft of the steering gear can be well dustproof and waterproof, and the oil leakage fault of the input shaft can be reduced.

Description

Technical Field

[0001] The utility model relates to a dustproof and waterproof structure for a steering gear input shaft. Background Art

[0002] In an existing automobile steering gear, during the long-term rotation of the input shaft, the sealing lip of the input shaft dustproof oil seal will be worn. Since the dynamic seal is close to the journal of the input shaft, it is easy for external foreign matter or worn foreign matter to enter along the input shaft into the area between the input shaft oil seal and the input shaft dustproof oil seal or the sealing lip of the input shaft oil seal, which will eventually cause oil leakage in the input shaft. In another automobile steering gear, during the long-term rotation of the input shaft, the inner end face of the input shaft dustproof oil seal and the inner end face of the input shaft dust cover will be worn, causing external foreign matter or worn foreign matter to enter along the mating end faces of the input shaft oil seal and the input shaft dustproof oil seal or the sealing lip of the input shaft oil seal, which will eventually cause oil leakage in the input shaft. Utility Model Content

[0003] The utility model mainly solves the technical problems existing in the prior art, thereby providing a dustproof and waterproof structure for a steering gear input shaft which has a simple structure and prevents oil leakage.

[0004] The above technical problems of the utility model are mainly solved by the following technical solutions:

[0005] A dustproof and waterproof structure for a steering gear input shaft comprises an input shaft, an input shaft dustproof oil seal sleeved on the input shaft, a valve body for positioning the input shaft, an upper cover nut arranged on the valve body, and an input shaft oil seal arranged on the inner side of the input shaft dustproof oil seal, wherein the input shaft dustproof oil seal comprises a static seal and a dynamic seal mechanism, wherein the static seal portion is close to the shaft neck of the input shaft, and the dynamic seal portion is far away from the shaft neck of the input shaft, and the dynamic seal adopts a labyrinth seal structure design, wherein the static seal portion is arranged at the inner hole portion of the input shaft dustproof oil seal, and adopts a tight fit structure with a large interference formed between the inner hole portion of the input shaft dustproof oil seal and the input shaft, and is fixed at the spline backcut groove of the input shaft.

[0006] Preferably, the dynamic sealing portion is arranged on the inner end surface and sealing lip of the input shaft dustproof oil seal, and adopts a tight fit structure with a small interference.

[0007] Preferably, the inner end face of the input shaft dustproof oil seal is tightly against the end face of the upper cover nut, forming a tight fit with a small interference. There is a cylindrical boss on the end face of the upper cover nut, and there is a dustproof oil seal seat hole on the boss, which forms a tight fit with a small interference with the sealing lip of the input shaft dustproof oil seal.

[0008] Preferably, the sealing lip of the input shaft dustproof oil seal is composed of two raised circular rings with a bullet-shaped cross-section, and two grease storage grooves are also provided on the inner side of the input shaft dustproof oil seal.

[0009] Preferably, the mating portion of the input shaft dustproof oil seal and the grease storage groove are coated with lithium-based grease.

[0010] Preferably, an outer end face of the input shaft dustproof oil seal is marked with an arrow.

[0011] The beneficial effects of the dustproof and waterproof structure for the steering gear input shaft of the utility model are as follows: since the dustproof and waterproof structure for the steering gear input shaft adopts static seals and dynamic seals, the static seal part is close to the shaft neck of the input shaft, the dynamic seal part is far away from the shaft neck of the input shaft, and the dynamic seal adopts a labyrinth seal structure design, it can play a good dustproof and waterproof effect on the input shaft of the steering gear, and reduce the oil leakage failure of the input shaft. The static seal part is designed at the inner hole part of the dustproof oil seal of the input shaft, and adopts a tight fit structure with a large interference amount formed by it and the spline back cutter groove of the input shaft. The dynamic seal part is designed on the inner side end face and the sealing lip of the dustproof oil seal of the input shaft, which adopts a tight fit structure with a small interference amount and adopts a labyrinth seal structure design, which plays a good dustproof and waterproof role. Grease is coated on its matching part and grease storage tank to play a role of lubrication, rust prevention and foreign matter absorption. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 This is a schematic diagram of the structure of a dustproof and waterproof structure for a steering gear input shaft of the utility model;

[0014] In the figure: 1. Input shaft; 2. Input shaft dustproof oil seal; 3. Upper cover nut; 4. Input shaft oil seal; 5. Valve body. DETAILED DESCRIPTION

[0015] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0016] See also Figure 1As shown, the utility model adopts the following technical scheme: a dustproof and waterproof structure for a steering gear input shaft, comprising an input shaft 1, and an input shaft dustproof oil seal 2 sleeved on the input shaft 1, and a valve body 5 for positioning the input shaft 1, and an upper cover nut 3 arranged on the valve body 5, and an input shaft oil seal 4 arranged on the inner side of the input shaft dustproof oil seal 2, the input shaft dustproof oil seal 2 comprises a static seal and a dynamic seal mechanism, the static seal portion is close to the shaft neck of the input shaft 1, the dynamic seal portion is far away from the shaft neck of the input shaft 1, the dynamic seal adopts a labyrinth seal structure design, the static seal portion is arranged at the inner hole portion of the input shaft dustproof oil seal 2, and a tight fit structure with a large interference formed by the inner hole portion of the input shaft dustproof oil seal 2 and the input shaft 1 is adopted, and is fixed at the spline backcut groove of the input shaft 1.

[0017] The dynamic sealing part is arranged on the inner end surface and the sealing lip of the input shaft dustproof oil seal 2, and adopts a tight fit structure with a small interference.

[0018] The inner end face of the input shaft dustproof oil seal 2 is tightly attached to the end face of the upper cover nut 3, forming a tight fit with a small interference. There is a cylindrical boss on the end face of the upper cover nut 3, and there is a dustproof oil seal seat hole on the boss, which forms a tight fit with a small interference with the sealing lip of the input shaft dustproof oil seal 2.

[0019] The sealing lip of the input shaft dustproof oil seal 2 is composed of two raised circular rings with a bullet-shaped cross-section, and two grease storage grooves are also arranged on the inner side of the input shaft dustproof oil seal 2.

[0020] The mating part and grease storage groove of the input shaft dustproof oil seal 2 are coated with lithium-based grease.

[0021] The outer end face of the input shaft dustproof oil seal 2 is marked with an arrow.

[0022] The material of the input shaft dustproof oil seal 2 is rubber, which includes a static seal and a dynamic seal. The function is to prevent dust and water from entering the input shaft 1 of the steering gear, preventing foreign matter such as dust, mud, sand, etc. from entering the area between the input shaft oil seal 4 and the input shaft dustproof oil seal 2 or the sealing lip area of ​​the input shaft oil seal 4 along the input shaft 1, causing an input shaft oil leakage fault. If these foreign matter enters the area between the input shaft oil seal 4 and the input shaft dustproof oil seal 2 along the input shaft 1, it will cause gradual rust from the outside to the inside along the input shaft 1, destroying the surface roughness of the input shaft 1, causing abnormal wear of the sealing lip of the input shaft oil seal 4, and finally causing input shaft oil leakage. If these foreign matter enters the sealing lip area of ​​the input shaft oil seal 4 along the input shaft 1, these foreign matter will follow the input shaft 1 rotates, destroying the sealing function of the input shaft oil seal 4, causing oil leakage of the input shaft 1. The static sealing part is designed at the inner hole of the input shaft dustproof oil seal 2, close to the journal of the input shaft 1, and adopts a tight fit structure with a large interference amount formed by the inner hole of the input shaft dustproof oil seal 2 and the input shaft 1. It is fixed at the spline back-cut groove of the input shaft 1 to achieve dustproof and waterproof functions. The dynamic sealing part is designed at the inner end face and sealing lip of the input shaft dustproof oil seal 2, away from the journal of the input shaft 1, which adopts a tight fit structure with a small interference amount and a labyrinth sealing structure design to achieve dustproof and waterproof functions. The inner end face of the input shaft dustproof oil seal 2 is close to the end face of the upper cover nut 3, forming a tight fit with a small interference amount. There is a cylindrical boss on the end face of the upper cover nut 3. There is a dust seal seat hole on the boss, which forms a tight fit with the sealing lip of the input shaft dust seal 2 with a small interference. The sealing lip of the input shaft dust seal 2 is composed of two raised circular rings with a bullet-shaped cross-section, which play a role in sealing and reducing friction. Two grease storage grooves are also designed on the inner side of the input shaft dust seal 2 to store grease. The mating parts of the input shaft dust seal 2 and the grease storage grooves are pre-coated with lithium-based grease to lubricate, prevent rust and absorb foreign matter. There is an "arrow" mark on the outer end face of the input shaft dust seal 2. During assembly, align the "arrow" with the end face mark of the input shaft 1. When the steering gear leaves the factory, rotate the input shaft 1 to the middle position of the steering gear. At this time, the "arrow" of the input shaft dust seal 2, the end face mark of the input shaft 1, The end face engraving lines of the valve body 5 are aligned, which is convenient for the subsequent assembly of the steering wheel so that the whole vehicle is in the middle straight driving position. When the input shaft 1 rotates, the inner end face and sealing lip of the input shaft dustproof oil seal 2 and the end face and dustproof oil seal seat hole of the upper cover nut 3 rotate relative to each other. The input shaft dustproof oil seal 2 performs a sealing function by the small interference deformation formed between it and the upper cover nut 3. At the same time, the input shaft dustproof oil seal 2 can keep larger particles out by the inner end face. When the input shaft 1 rotates for a long time, the inner end face and sealing lip of the input shaft dustproof oil seal 2 will still be worn. External foreign matter or worn foreign matter enters along the inner end face of the input shaft dustproof oil seal 2 into the area between the outer side of the cylindrical boss of the upper cover nut 3 and the inner end face of the input shaft dustproof oil seal 2.Foreign objects with larger particles are blocked by the cylindrical boss. Since the steering gear is generally installed vertically, foreign objects with smaller particles are difficult to climb over the cylindrical boss and enter the outside of the sealing lip of the input shaft dustproof oil seal 2 under gravity. Even if some foreign objects with smaller particles or muddy water enter the outside of the sealing lip of the input shaft dustproof oil seal 2, they will be blocked by the sealing lip of the input shaft dustproof oil seal 2. Even if some foreign objects with smaller particles or muddy water pass through the two annular sealing lips of the input shaft dustproof oil seal 2 and enter the cavity area of ​​the grease storage tank, they will be absorbed by the grease in the grease storage tank. These foreign objects are difficult to enter the area between the input shaft oil seal 4 and the input shaft dustproof oil seal 2 or the sealing lip area of ​​the input shaft oil seal 4 along the input shaft 1. The matching parts of the input shaft dustproof oil seal 2 and the grease storage tank are pre-coated with grease to lubricate, prevent rust and absorb foreign objects. In this way, the labyrinth seal structure design has a good dustproof and waterproof effect and reduces the oil leakage failure of the input shaft.

[0023] The beneficial effects of the dustproof and waterproof structure for the steering gear input shaft of the utility model are as follows: since the dustproof and waterproof structure for the steering gear input shaft adopts static seals and dynamic seals, the static seal part is close to the shaft neck of the input shaft, the dynamic seal part is far away from the shaft neck of the input shaft, and the dynamic seal adopts a labyrinth seal structure design, it can play a good dustproof and waterproof effect on the input shaft of the steering gear, and reduce the oil leakage failure of the input shaft. The static seal part is designed at the inner hole part of the dustproof oil seal of the input shaft, and adopts a tight fit structure with a large interference amount formed by it and the spline back cutter groove of the input shaft. The dynamic seal part is designed on the inner side end face and the sealing lip of the dustproof oil seal of the input shaft, which adopts a tight fit structure with a small interference amount and adopts a labyrinth seal structure design, which plays a good dustproof and waterproof role. Grease is coated on its matching part and grease storage tank to play a role of lubrication, rust prevention and foreign matter absorption.

[0024] It should be understood that in the claims and description of the utility model, all "including..." should be understood as an open-ended meaning, that is, its meaning is equivalent to "at least contains...", and should not be understood as a closed meaning, that is, its meaning should not be understood as "only includes...".

[0025] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A dustproof and waterproof structure for a steering gear input shaft, characterized in that: It includes an input shaft, an input shaft dustproof oil seal sleeved on the input shaft, a valve body for positioning the input shaft, an upper cover nut arranged on the valve body, and an input shaft oil seal arranged on the inner side of the input shaft dustproof oil seal. The input shaft dustproof oil seal includes a static seal and a dynamic seal mechanism. The static seal portion is close to the shaft neck of the input shaft, and the dynamic seal portion is far away from the shaft neck of the input shaft. The dynamic seal adopts a labyrinth seal structure design. The static seal portion is arranged at the inner hole portion of the input shaft dustproof oil seal, and adopts a tight fit structure with a large interference formed by the inner hole portion of the input shaft dustproof oil seal and the input shaft, and is fixed at the spline backcut groove of the input shaft.

2. A dustproof and waterproof structure for a steering gear input shaft according to claim 1, characterized in that: The dynamic sealing part is arranged on the inner end surface and the sealing lip of the input shaft dustproof oil seal, and adopts a tight fit structure with a small interference amount.

3. The dustproof and waterproof structure for a steering gear input shaft according to claim 1, characterized in that: The inner end face of the input shaft dustproof oil seal is tightly attached to the end face of the upper cover nut, forming a tight fit with a small interference. A cylindrical boss is provided on the end face of the upper cover nut, and a dustproof oil seal seat hole is provided on the boss, which forms a tight fit with a small interference with the sealing lip of the input shaft dustproof oil seal.

4. A dustproof and waterproof structure for a steering gear input shaft according to claim 1, characterized in that: The sealing lip of the input shaft dustproof oil seal is composed of two raised circular rings with bullet-shaped cross-sections, and two grease storage grooves are also arranged on the inner side of the input shaft dustproof oil seal.

5. A dustproof and waterproof structure for a steering gear input shaft according to claim 4, characterized in that: The mating part of the input shaft dustproof oil seal and the grease storage groove are coated with lithium-based grease.

6. The dustproof and waterproof structure for a steering gear input shaft according to claim 1, characterized in that: An arrow mark is provided on the outer end face of the input shaft dustproof oil seal.

Images