Shaft end sealing structure of steering system

Abstract

The utility model discloses a shaft end sealing structure of a steering system, and belongs to the technical field of automobile steering. An upper universal joint is fixedly connected to the upper portion of the spline housing, a nylon assembly is fixedly connected to the outer wall of the middle of the spline housing, a sealing dust cover is fixedly connected to the outer wall of the nylon assembly, a pressing plate is fixedly connected to the sealing dust cover, a spline shaft is fixed to the lower portion of the spline housing in the circumferential direction, and a rubber sealing ring and a limiting check ring are arranged at the bottom of the spline housing. The rubber sealing ring is located in the limiting check ring, the inner wall of the rubber sealing ring makes contact with the outer wall of the spline shaft, and the bottom of the spline shaft is fixedly connected with a lower universal joint. According to the sealing dustproof cover, the lip structure is arranged, the sealing performance between the sealing dustproof cover and the spline housing is further improved, when the external water level is higher than the lip, under the action of water pressure, the lip can be attached to the outer wall of the spline housing more tightly, and the sealing effect is enhanced. The sealing structure is mainly used for improving the sealing performance of the vehicle body.

Description

Technical Field

[0001] The utility model belongs to the technical field of automotive steering, and more particularly, to an end seal structure of a steering system. Background Art

[0002] At present, the gap fit design is usually adopted at the joint of the lower steering shaft and the dust cover of an automobile. A nylon sleeve is added between the rubber dust cover and the steering shaft, and grease is applied to reduce the friction force and eliminate abnormal noise. This set of structures is simple, but has many disadvantages: there is a fit gap between the nylon sleeve and the steering shaft, which will cause the air outside the cab to enter the cab, reducing the air-conditioning temperature adjustment efficiency. At the same time, the dust outside the cab will combine with the grease in the fit gap along with the air, reducing the lubrication effect of the grease. And when the water level around the vehicle is too high, the water will flow into the vehicle through the fit gap. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide an end seal structure of a steering system. By setting a lip structure, the sealing performance between the seal dust cover and the spline sleeve is further improved. And when the external water level is higher than the lip, under the action of water pressure, the lip will fit more tightly to the outer wall of the spline sleeve, strengthening the sealing effect.

[0004] The described end seal structure of a steering system includes a spline sleeve. An upper universal joint is fixedly connected to the upper part of the spline sleeve. A nylon assembly is fixedly connected to the outer wall of the middle part of the spline sleeve. A seal dust cover is fixedly connected to the outer wall of the nylon assembly. A pressing plate is fixedly connected to the seal dust cover. A spline shaft is circumferentially fixed to the lower part of the spline sleeve. A rubber seal ring and a limit retaining ring are arranged at the bottom of the spline sleeve. The rubber seal ring is located inside the limit retaining ring. The inner wall of the rubber seal ring is in contact with the outer wall of the spline shaft. A lower universal joint is fixedly connected to the bottom of the spline shaft.

[0005] Preferably, the upper universal joint includes a universal joint fork two. The bottom of the universal joint fork two is fixedly connected to the spline sleeve. A universal joint cross shaft is rotatably connected to the upper part of the universal joint fork two. A universal joint fork one is also rotatably connected to the universal joint cross shaft. A locking bolt is arranged on the universal joint fork one.

[0006] Preferably, the nylon assembly includes a nylon ring. There is an interference fit between the inner wall of the nylon ring and the outer wall of the spline sleeve. A nylon sleeve is rotatably connected to the outer wall of the nylon ring. A limit ring is fixedly connected to the side wall of the nylon sleeve. The limit ring is matched with the side wall of the nylon ring.

[0007] Preferably, a plurality of first openings are fixedly formed on the outside of the sealing dust cover. A sealing rib is also fixedly connected to the outside of the sealing dust cover. An installation notch is fixedly provided at one end inside the sealing dust cover. There is an interference fit between the inner wall of the installation notch and the outer wall of the nylon sleeve. A lip is fixedly provided at the other end inside the sealing dust cover. A plurality of second openings are fixedly formed on the pressing plate, and the second openings cooperate with the first openings.

[0008] Preferably, there is an interference fit between the lip and the outer wall of the spline sleeve, and the angle between the lip and the axis of the spline sleeve is 5°.

[0009] Preferably, a snap ring is fixedly connected to the inner wall of the limit retaining ring. A snap groove is fixedly formed on the outer wall of the lower part of the spline sleeve, and the snap groove cooperates with the snap ring. A rubber dust cover is provided outside the limit retaining ring. One end of the rubber dust cover is fixedly connected to the spline sleeve through a clamp, and the other end of the rubber dust cover is fixedly connected to the spline shaft through a clamp.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0011] 1. By setting the lip structure, the sealing performance between the sealing dust cover and the spline sleeve is further improved. When the external water level is higher than the lip, under the action of water pressure, the lip will fit more tightly to the outer wall of the spline sleeve, enhancing the sealing effect.

[0012] 2. By setting the nylon component, the friction between the sealing dust cover and the spline sleeve is reduced, avoiding the situation of insufficient vehicle sealing caused by the gap generated between the sealing dust cover and the spline sleeve due to friction after long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0014] Figure 2 is a schematic diagram of the structure of the universal joint;

[0015] Figure 3 is a schematic diagram of the structure of the spline shaft and the spline sleeve;

[0016] Figure 4 is a schematic diagram of the internal structure of the spline shaft and the spline sleeve;

[0017] Figure 5 is a schematic diagram of the structure of the limit retaining ring;

[0018] Figure 6 is a schematic diagram of the inner side structure of the sealing dust cover;

[0019] Figure 7 is a schematic diagram of the outer side structure of the sealing dust cover;

[0020] Figure 8Schematic diagram of the internal structure of the sealing dust cover;

[0021] Figure 9 Schematic diagram of the structure of the nylon component.

[0022] In the figure, 1 is the upper universal joint; 101 is the first universal joint fork; 102 is the universal joint cross shaft; 103 is the second universal joint fork; 104 is the locking bolt; 2 is the spline sleeve; 201 is the buckling groove; 3 is the sealing dust cover; 301 is the first opening; 302 is the installation notch; 303 is the lip; 304 is the sealing rib; 4 is the pressing plate; 401 is the second opening; 5 is the rubber dust cover; 6 is the spline shaft; 7 is the lower universal joint; 8 is the nylon component; 801 is the nylon ring; 802 is the nylon sleeve; 803 is the limiting ring; 9 is the limiting retaining ring; 901 is the snap ring; 10 is the rubber sealing ring. Specific implementation mode

[0023] The following further describes the present utility model with reference to the accompanying drawings:

[0024] The orientation terms involved in the paragraphs of detailed description are only for the convenience of those skilled in the art to understand the technical solutions described in this application according to the visual orientation shown in the accompanying drawings. Unless otherwise clearly specified and limited, terms such as "set", "installed", "connected", etc. should be understood in a broad sense. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0025] As Figure 1 and Figure 3 shown, a shaft end sealing structure of a steering system includes a spline sleeve 2. The upper part of the spline sleeve 2 is fixedly connected with an upper universal joint 1, and is fixedly connected with the steering shaft inside the vehicle through the upper universal joint 1. The outer wall of the middle part of the spline sleeve 2 is fixedly connected with a nylon component 8. By setting the nylon component 8, the friction between the sealing dust cover 3 and the spline sleeve 2 is reduced, and the situation of insufficient vehicle sealing caused by the gap generated by the friction between the sealing dust cover 3 and the spline sleeve 2 after long-term use is avoided.

[0026] The outer wall of the nylon component 8 is fixedly connected with a sealing dust cover 3, and a pressing plate 4 is fixedly connected to the sealing dust cover 3. The sealing dust cover 3 is fixed to the vehicle body through the pressing plate 4, ensuring sufficient fit between the sealing dust cover 3 and the vehicle body; a spline shaft 6 is circumferentially fixed to the lower part of the spline sleeve 2. A rubber sealing ring 10 and a limiting retaining ring 9 are provided at the bottom of the spline sleeve 2. The rubber sealing ring 10 is located inside the limiting retaining ring 9, and the inner wall of the rubber sealing ring 10 is in contact with the outer wall of the spline shaft 6. By setting the limiting retaining ring 9, axial limitation of the spline shaft 6 and the spline sleeve 2 is carried out to prevent the two from separating. The bottom of the spline shaft 6 is fixedly connected with a lower universal joint 7. It is fixedly connected with the steering shaft outside the vehicle through the lower universal joint 7.

[0027] AsFigure 2 As shown in the figure, the upper universal joint 1 includes a universal joint fork two 103. The bottom of the universal joint fork two 103 is fixedly connected to the spline sleeve 2. The upper part of the universal joint fork two 103 is rotatably connected to a universal joint cross shaft 102. A universal joint fork one 101 is also rotatably connected to the universal joint cross shaft 102. A locking bolt 104 is provided on the universal joint fork one 101. The upper universal joint 1 is firmly fixed to the steering shaft inside the vehicle through the locking bolt 104.

[0028] As Figure 9 shown in the figure, the nylon assembly 8 includes a nylon ring 801. There is an interference fit between the inner wall of the nylon ring 801 and the outer wall of the spline sleeve 2. A nylon sleeve 802 is rotatably connected to the outer wall of the nylon ring 801. A limiting ring 803 is fixedly connected to the side wall of the nylon sleeve 802. The limiting ring 803 cooperates with the side wall of the nylon ring 801. The limiting ring 803 plays an axial limiting role on the nylon ring 801 and the nylon sleeve 802, preventing the nylon ring 801 and the nylon sleeve 802 from falling off.

[0029] As Figure 6 and Figure 7 shown in the figure, a plurality of groups of first openings 301 are fixedly opened on the outside of the sealing and dust-proof cover 3. A sealing rib 304 is also fixedly connected to the outside of the sealing and dust-proof cover 3. By setting the sealing rib 304, it is ensured that the sealing and dust-proof cover 3 fits more closely to the vehicle body, ensuring the sealing performance of the vehicle. One end inside the sealing and dust-proof cover 3 is fixedly provided with a mounting notch 302. There is an interference fit between the inner wall of the mounting notch 302 and the outer wall of the nylon sleeve 802. The other end inside the sealing and dust-proof cover 3 is fixedly provided with a lip 303. A plurality of groups of second openings 401 are fixedly opened on the pressing plate 4. The second openings 401 cooperate with the first openings 301.

[0030] As Figure 8 shown in the figure, there is an interference fit between the lip 303 and the outer wall of the spline sleeve 2. The angle between the lip 303 and the axis of the spline sleeve 2 is 5°. The unilateral interference amount between the lip 303 and the spline sleeve 2 is 0.3 mm - 0.5 mm. Since the lip 303 is thin and has a certain elasticity, the frictional resistance between it and the spline sleeve 2 is very small. By setting the lip 303 structure, the sealing performance between the sealing and dust-proof cover 3 and the spline sleeve 2 is further improved. And when the external water level is higher than the lip 303, under the action of water pressure, the lip 303 will fit more closely to the outer wall of the spline sleeve 2, strengthening the sealing effect.

[0031] As Figure 4 and Figure 5As shown, a snap ring 901 is fixedly connected to the inner wall of the limit retaining ring 9. A snap groove 201 is fixedly formed on the outer wall of the lower part of the spline sleeve 2. The snap groove 201 is matched with the snap ring 901. A rubber dust cover 5 is arranged outside the limit retaining ring 9. One end of the rubber dust cover 5 is fixedly connected to the spline sleeve 2 through a clamp, and the other end of the rubber dust cover 5 is fixedly connected to the spline shaft 6 through a clamp. Since there is a fitting gap between the spline sleeve 2 and the spline shaft 6, the rubber dust cover 5 is provided to prevent dust from entering and affecting the sliding between the spline sleeve 2 and the spline shaft 6.

[0032] The utility model further improves the sealing performance between the sealing dust cover 3 and the spline sleeve 2 by arranging the lip 303 structure. And when the external water level is higher than the lip 303, under the action of water pressure, the lip 303 will fit more tightly to the outer wall of the spline sleeve 2, enhancing the sealing effect. By arranging the nylon component 8, the friction between the sealing dust cover 3 and the spline sleeve 2 is reduced, avoiding the situation of insufficient vehicle sealing caused by the gap generated by the friction between the sealing dust cover 3 and the spline sleeve 2 after long-term use.

Claims

1. An end seal structure for a steering system, characterized in that: It includes a spline sleeve (2). An upper universal joint (1) is fixedly connected to the upper part of the spline sleeve (2). A nylon assembly (8) is fixedly connected to the outer wall of the middle part of the spline sleeve (2). A sealing and dust-proof cover (3) is fixedly connected to the outer wall of the nylon assembly (8). A pressing plate (4) is fixedly connected to the sealing and dust-proof cover (3). A spline shaft (6) is circumferentially fixed to the lower part of the spline sleeve (2). A rubber sealing ring (10) and a limit retaining ring (9) are provided at the bottom of the spline sleeve (2). The rubber sealing ring (10) is located inside the limit retaining ring (9). The inner wall of the rubber sealing ring (10) is in contact with the outer wall of the spline shaft (6). A lower universal joint (7) is fixedly connected to the bottom of the spline shaft (6).

2. The shaft end sealing structure of a steering system according to claim 1, characterized in that: The upper universal joint (1) includes a universal joint fork two (103). The bottom of the universal joint fork two (103) is fixedly connected to the spline sleeve (2). A universal joint cross shaft (102) is rotatably connected to the upper part of the universal joint fork two (103). A universal joint fork one (101) is also rotatably connected to the universal joint cross shaft (102). A locking bolt (104) is provided on the universal joint fork one (101).

3. The shaft end sealing structure of a steering system according to claim 1, characterized in that: The nylon assembly (8) includes a nylon ring (801). There is an interference fit between the inner wall of the nylon ring (801) and the outer wall of the spline sleeve (2). A nylon sleeve (802) is rotatably connected to the outer wall of the nylon ring (801). A limit ring (803) is fixedly connected to the side wall of the nylon sleeve (802). The limit ring (803) cooperates with the side wall of the nylon ring (801).

4. A shaft end sealing structure of a steering system according to claim 1, characterized in that: Multiple groups of openings one (301) are fixedly opened on the outside of the sealing and dust-proof cover (3). A sealing rib (304) is also fixedly connected to the outside of the sealing and dust-proof cover (3). An installation notch (302) is fixedly provided at one end inside the sealing and dust-proof cover (3). There is an interference fit between the inner wall of the installation notch (302) and the outer wall of the nylon sleeve (802). A lip (303) is fixedly provided at the other end inside the sealing and dust-proof cover (3). Multiple groups of openings two (401) are fixedly opened on the pressing plate (4). The openings two (401) cooperate with the openings one (301).

5. The shaft end sealing structure of a steering system according to claim 4, characterized in that: There is an interference fit between the lip (303) and the outer wall of the spline sleeve (2). The angle between the lip (303) and the axis of the spline sleeve (2) is 5°.

6. The shaft end sealing structure of a steering system according to claim 1, characterized in that: A snap ring (901) is fixedly connected to the inner wall of the limit retaining ring (9). A snap groove (201) is fixedly opened on the outer wall of the lower part of the spline sleeve (2). The snap groove (201) cooperates with the snap ring (901). A rubber dust-proof cover (5) is provided outside the limit retaining ring (9). One end of the rubber dust-proof cover (5) is fixedly connected to the spline sleeve (2) through a clamp. The other end of the rubber dust-proof cover (5) is fixedly connected to the spline shaft (6) through a clamp.

Images