Steering gear and dustproof assembly for steering gear
By designing a steering gear dustproof component with an interference fit between the dust cover and the input shaft, the problem of reduced oil seal performance caused by exposed input shaft was solved, achieving effective protection of the oil seal and improving the safety and durability of the steering system.
Patent Information
- Application Number
- CN202520369956.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-05
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2035-03-05
AI Technical Summary
The existing steering input shaft and oil seal contact area are exposed, making them susceptible to erosion by mud and moisture, which leads to a decrease in the sealing performance of the oil seal and affects the safety and lifespan of the steering system.
Design a dustproof component for a steering gear, including a dust cover and an end cover. The dust cover is interference-fitted with the input shaft, and the ring cover covers the outer peripheral wall of the end cover. Combined with a labyrinth design, it prevents water and mud from entering the oil seal.
It effectively protects the oil seals, ensures their sealing performance, prevents rust and wear, and improves the reliability and service life of the steering system.
Smart Images
Figure CN223594973U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of steering gear accessories, and in particular to a steering gear and a dustproof assembly for the steering gear. BACKGROUND
[0002] In the technical field of automobile steering systems, the input shaft of the steering gear is a core transmission component connecting the steering wheel and the steering execution mechanism, and its working reliability directly determines the control safety and steering accuracy of the vehicle. However, the input shaft is usually exposed to the bottom of the engine compartment or the chassis area of the vehicle, and is long-term eroded by rainwater, sand, salt mist and road debris, which poses a severe durability challenge.
[0003] At present, the commonly used technical solution in the industry is to set an end cover and an oil seal combination structure on the input shaft. Specifically, the end cover is installed on the outer peripheral wall of the oil seal, and the internal sensors and other precision components are wrapped and protected through the cooperation of the two. However, the existing design has a significant defect: the contact area between the input shaft and the oil seal is still in an exposed state. When the vehicle is driving in harsh environments, sand or water can easily enter this exposed part, causing the surface of the input shaft to rust. Rust not only exacerbates the wear of the shaft body, but also further causes the oil seal lip to deform or abnormally wear due to the increased surface roughness of the input shaft. This problem directly leads to a decrease in the sealing performance of the oil seal, and even causes the oil seal to fail prematurely, ultimately threatening the safety and service life of the steering system. SUMMARY
[0004] In view of the technical problem that the oil seal lip deforms due to the increased surface roughness of the input shaft, the utility model provides a steering gear and a dustproof assembly for the steering gear. The ring cover gap covers the outer peripheral wall of the end cover, and the oil seal is protected inside, thereby preventing water or sand from entering the oil seal and ensuring the sealing performance of the oil seal.
[0005] The technical scheme adopted by the utility model is as follows: a dustproof assembly for a steering gear, comprising a dust cover, an oil seal and an end cover, the dust cover comprising a dust cover and a ring cover connected at an angle to the dust cover, the end cover being tightly fitted with the outer peripheral wall of the oil seal, the dust cover being provided with a through hole for interference fit with the input shaft, the inner wall of the dust cover corresponding to the end face of the oil seal, and the outer peripheral wall of the end cover being covered by the ring cover gap.
[0006] Since the dust cover has a through hole for interference fit with the input shaft, the dust cover rotates with the input shaft, and the ring cover gap covers the outer peripheral wall of the end cover, thereby protecting the oil seal inside, preventing water or sand from entering the oil seal, and ensuring the sealing performance of the oil seal.
[0007] Optionally, the end cover comprises a convex cover and a cover body connected at an angle to the convex cover, the inner peripheral wall of the convex cover being rotatably connected with the outer peripheral wall of the oil seal, at least part of the outer peripheral wall of the end cover being covered by the ring cover gap, and the cover body being used for connecting with the steering housing.
[0008] Since the end cover is fixedly connected with the cover body and the steering housing, the ring cover gap of the dust cover covers the convex cover outer peripheral wall, that is, the ring cover inner wall does not contact the convex cover outer peripheral wall, and interference of the dust cover on the end cover during synchronous rotation with the input shaft is avoided.
[0009] Optionally, the dust cover surface and the cover body are both arranged obliquely.
[0010] Since the steering gear is arranged vertically and is high from the ground, it is difficult for water to enter from below, and only when the vehicle moves on a rainy day, part of the water and the sand can enter the inside of the end cover, and the oblique arrangement of the dust cover and the end cover avoids the accumulation of water or sand, and further prevents the water or sand from entering the oil seal and the inner wall of the end cover.
[0011] Optionally, the ring cover inner wall is provided with a ring protrusion, and the convex cover outer peripheral wall is provided with a ring groove matched with the ring protrusion,
[0012] The labyrinth design is further adopted to avoid the entry of water or sand.
[0013] The utility model discloses still a kind of steering gears, including input shaft and the dustproof assembly of steering gear described above, the input shaft is cooperated with the through hole, the oil seal inner wall is equipped with the lip that rotates with input shaft cooperation.
[0014] Oil seal is wrapped in the outer peripheral wall of input shaft by lip, and the material of oil seal is generally elastic rubber, which maintains sealing pressure by elastic deformation.
[0015] Optionally, the included angle between the dust cover surface and the ring cover is in the range of 90-150 degrees.
[0016] Optionally, the ring cover and the ring protrusion are both arranged in parallel with the input shaft.
[0017] Optionally, the outer peripheral wall of the input shaft is sleeved with a bearing, and the inner peripheral wall of the cover body is tightly matched with the outer ring of the bearing.
[0018] The utility model discloses the beneficial effects are: since dust cover surface has the through hole of interference fit with input shaft, dust cover rotates with input shaft, ring cover gap covers the outer peripheral wall of end cover, and oil seal is protected in, to avoid water or sand into oil seal, ensure the sealing performance of oil seal. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 The structure diagram of the dustproof assembly for steering gear is provided for the utility model embodiment;
[0020] Figure 2 The sectional view of the dustproof assembly for steering gear is provided for the utility model embodiment.
[0021] The marks in the drawings are: 1, dust cover; 11, dust cover; 12, ring cover; 13, ring convex; 2, oil seal; 3, end cover; 31, convex cover; 32, cover body; 4, input shaft; 5, bearing. DETAILED DESCRIPTION
[0022] The application will be further described in detail below with reference to the drawings and examples.
[0023] As shown in Figure 1 and 2 , the embodiment discloses a dustproof assembly for a steering gear, comprising a dust cover 1, an oil seal 2 and an end cover 3, the dust cover 1 comprises a dust cover 11 and a ring cover 12 connected at an angle with the dust cover 11, the end cover 3 is tightly fitted with the outer peripheral wall of the oil seal 2, the dust cover 11 is provided with a through hole for interference fit with the input shaft 4, the inner wall of the dust cover 11 is correspondingly provided with the end face of the oil seal 2, and part of the outer peripheral wall of the end cover 3 is gap covered by the ring cover 12. Since the dust cover 11 has a through hole for interference fit with the input shaft 4, the dust cover 1 rotates together with the input shaft 4, the ring cover 12 gap covers the outer peripheral wall of the end cover 3, and the oil seal 2 is protected inside, thereby avoiding water or sand entering the oil seal 2 and ensuring the sealing performance of the oil seal 2.
[0024] In the embodiment, as shown in Figure 2 , the end cover 3 comprises a convex cover 31 and a cover body 32 connected at an angle with the convex cover 31, the inner peripheral wall of the convex cover 31 is rotationally fitted with the outer peripheral wall of the oil seal 2, at least part of the outer peripheral wall of the end cover 3 is gap covered by the ring cover 12, and the cover body 32 is used for connecting with the steering housing. Since the end cover 3 is fixedly connected with the steering housing through the cover body 32, the ring cover 12 of the dust cover 1 gap covers the outer peripheral wall of the convex cover 31, that is, the inner wall of the ring cover 12 does not contact with the outer peripheral wall of the convex cover 31, avoiding interference of the dust cover 1 on the end cover 3 when synchronously rotating with the input shaft 4. The outer peripheral wall of the input shaft 4 is sleeved with a bearing 5, and the inner peripheral wall of the cover body 32 is tightly fitted with the outer ring of the bearing 5.
[0025] As shown in Figure 1 , the dust cover 11 and the cover body 32 are both arranged at an angle. Since the steering gear is arranged vertically and is high from the ground, it is difficult for water to enter from below, and only when the car is moving on a rainy day, part of the water and sand may enter the inside of the end cover 3. The inclined arrangement of the dust cover 1 and the end cover 3 avoids the accumulation of water or sand, and further prevents water or sand from entering the inner wall of the oil seal 2 and the end cover 3.
[0026] In the embodiment, as shown in Figure 2 , the inner wall of the ring cover 12 is provided with a ring convex 13, the outer peripheral wall of the convex cover 31 is provided with a ring groove gap fitted with the ring convex 13, and a labyrinth design is adopted to further avoid the entry of water or sand.
[0027] AsFigure 2 As shown in the figure, the embodiment also discloses a steering gear, comprising an input shaft 4 and the dustproof assembly for steering gear described above, the input shaft 4 is in interference fit with the through hole, and the inner wall of the oil seal 2 is provided with a lip in rotational fit with the input shaft 4. The oil seal 2 is wrapped around the outer wall of the input shaft 4 through the lip, and the material of the oil seal 2 is generally elastic rubber, which maintains the sealing pressure through elastic deformation.
[0028] In the embodiment, as shown in the figure, the angle between the dustproof surface 11 and the ring cover 12 ranges from 90° to 150°. The ring cover 12 and the ring convex 13 are both arranged in parallel with the input shaft 4. The angle between the dustproof surface 11 and the ring cover 12 can be 90°, 120° or 150°. In the embodiment, the angle between the dustproof surface 11 and the ring cover 12 ranges from 120°, so that the dustproof surface 11 is arranged in an inclined manner to avoid the accumulation of sand or water vapor on the dustproof surface 11. Figure 2
[0029] It can be understood that the specific embodiments described above are only used to explain the utility model, but not limit the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for convenience of description. The multiple technical solutions in the same embodiment and the multiple technical solutions in different embodiments can be arranged and combined to form new technical solutions without contradiction or conflict. Any equivalent structural transformation, direct or indirect application in other related technical fields, and the like are also included in the protection scope of the utility model.
Claims
1. A dust-proof assembly for a steering gear, characterized by The dustproof cover comprises a dustproof surface and a ring cover connected with the dustproof surface at an angle, and the end cover is tightly fitted with the outer peripheral wall of the oil seal.
2. The dust guard assembly for a diverter of claim 1, wherein, The end cover comprises a convex cover and a cover body connected with the convex cover at an angle, the inner peripheral wall of the convex cover is rotationally fitted with the outer peripheral wall of the oil seal, at least part of the outer peripheral wall of the end cover is covered by the ring cover gap, and the cover body is used for connecting with the steering housing.
3. The dust guard assembly for a diverter of claim 2, wherein, The dustproof surface and the cover body are both arranged at an angle.
4. The dust guard assembly for a diverter of claim 2, wherein, The inner wall of the ring cover is provided with a ring convex, and the outer peripheral wall of the convex cover is provided with a ring groove gap-fitted with the ring convex.
5. A diverter characterized by, The dustproof assembly for the steering gear comprises an input shaft and the dustproof assembly for the steering gear according to any one of claims 2-4, the input shaft is interference-fitted with the through hole, and the inner peripheral wall of the oil seal is provided with a lip rotationally fitted with the input shaft.
6. The diverter of claim 5, wherein, The included angle between the dustproof surface and the ring cover ranges from 90 to 150 degrees.
7. The diverter of claim 5, wherein, The ring cover and the ring convex are both arranged in parallel with the input shaft.
8. The diverter of claim 5, wherein, The outer peripheral wall of the input shaft is sleeved with a bearing, and the inner peripheral wall of the cover body is tightly fitted with the outer ring of the bearing.