Dustproof sealing structure of automobile ball pin
By combining positioning and sealing components, the problem of automotive ball pin dust covers loosening under vibration is solved, achieving a stable connection and efficient sealing, and ensuring the long-term reliability and safety of the sealing structure.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGXI XINDAYUAN MASCH MFG CO LTD
- Filing Date
- 2025-11-05
- Publication Date
- 2026-08-04
AI Technical Summary
Existing automotive ball pin dustproof seals are prone to loosening under severe vibration, leading to seal failure and failing to effectively prevent dust and grease leakage in the long term, posing a safety hazard.
The design employs a combination of positioning and sealing components, including the insertion and engagement of a positioning ring and a resistance rod. The resistance rod is then frictionally locked with the slide groove, and the lower end locks the dust cover to the ball head seat. The connecting rod is clamped by a tightening component, thus forming a mechanically enhanced seal.
It achieves a stable connection of the dust cover under harsh working conditions, prevents impurities from entering and lubricant from leaking, significantly improves the reliability and stability of the seal, and extends the service life of the ball pin.
Smart Images
Figure CN224592546U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of automotive parts technology, and in particular to a dustproof sealing structure for automotive ball joints. Background Technology
[0002] Ball joints are critical force-transmitting components in automotive steering and suspension modules, and their performance directly affects vehicle handling stability and driving safety. The spherical joint inside the ball joint needs to rotate flexibly in a lubricated environment; therefore, a reliable dustproof seal must be installed externally to prevent the intrusion of external dust, moisture, and other impurities, and to prevent internal grease leakage.
[0003] In existing technical solutions, a one-piece flexible rubber dust cover is typically used to cover the outside of the ball joint. This dust cover, through openings at its upper and lower ends, fits onto the connecting rod and the ball joint seat respectively, and is secured primarily by the elastic contraction force of the openings themselves, or supplemented by simple metal spring clamps, thus achieving a seal. This structure is simple, inexpensive, and can provide basic protection under ideal working conditions.
[0004] However, during actual driving, the chassis components of a car need to withstand continuous high-frequency vibrations, bumps, impacts, and large-angle tensile and torsional forces from the road surface. Under such complex and harsh dynamic conditions, relying solely on elastic force and the radial clamping force provided by simple clamps is often insufficient to guarantee long-term effective fixation. With the increase in usage time, material aging and continuous dynamic stress can cause the opening of the dust cover to loosen, shift, or even detach from the ball joint or connecting rod. Once the seal of the dust cover is damaged, external dust and mud can penetrate into the ball joint, mixing with the grease to form an abrasive, which rapidly accelerates the wear of the ball joint and the ball seat. At the same time, grease leakage can also lead to dry friction in the joint, eventually causing abnormal noise from the ball joint, steering play, and in severe cases, even ball joint detachment, posing a serious safety hazard. Existing dust sealing structures have significant shortcomings in terms of long-term reliability and stability.
[0005] Therefore, this utility model proposes a dustproof sealing structure for automotive ball joints to address the shortcomings of existing technologies. Utility Model Content
[0006] To overcome the above shortcomings, this utility model provides a dustproof sealing structure for automotive ball pins, aiming to improve the problem that the existing technology is prone to loosening under long-term vehicle vibration conditions due to its simple fixing method, resulting in low sealing reliability.
[0007] To achieve the above objectives, the present invention adopts the following technical solution: a dustproof sealing structure for an automotive ball joint, comprising a ball head seat, a ball, a connecting rod, and a dust cover; as well as a positioning component and a sealing component; The positioning component is used to lock the lower end of the dust cover onto the ball joint, and the positioning component includes a connecting ring, a positioning ring, and a resistance rod; the sealing component is used to clamp the upper end of the dust cover onto the connecting rod, and the sealing component includes a sealing ring, a clamping plate, a rotating shaft, a rubber body, a tightening component, and a side plate. Furthermore, the components are assembled in the following manner: the connecting ring is fixedly connected to the lower end of the dust cover, and a positioning ring is provided at the bottom of the connecting ring, which is inserted into a positioning groove on the ball joint; a resistance rod is slidably provided on the inner side of the connecting ring, and the resistance rod is received in a sliding groove on the inner wall of the ball joint, with the resistance rod in frictional engagement with the inner wall of the sliding groove; the sealing ring is fixedly connected to the upper end of the dust cover, and a clamping plate is rotatably connected to the sealing ring via a rotating shaft, with a rubber body provided on the inner side of the clamping plate; the tightening member is drivenly connected to the side plate, and the side plate abuts against the outside of the clamping plate away from the connecting rod; Preferably, the groove extends circumferentially along the ball joint. Preferably, the resistance rod has a plate-like structure and a high-friction surface; Preferably, the rubber body is integrally formed on the inner side of the clamping plate facing the connecting rod; Preferably, the tightening member is a threaded member, and the tightening member is threadedly engaged with the side plate; Preferably, the side plate is provided with an abutment portion, which is used to push the outer side of the clamping plate; Preferably, the outer side of the clamping plate is provided with a pressing surface that cooperates with the side plate or the abutting part; Preferably, the positioning ring is an annular protrusion, and the positioning groove is an annular groove that matches the annular protrusion.
[0008] This utility model has the following beneficial effects: 1. This utility model solves the problem in the prior art that the dust cover is fixed by elastic force alone and is prone to loosening under severe vibration, leading to sealing failure, by setting a positioning component consisting of a positioning ring and a positioning groove for positioning and friction locking by a resistance rod and a sliding groove. It achieves a firm lock between the lower end of the dust cover and the ball head seat, significantly improving the connection stability.
[0009] 2. This utility model solves the problem of traditional elastic sealing failure due to uneven sealing force or aging by setting a sealing assembly driven by a tightening component to drive the clamping plate. It achieves active clamping of the connecting rod through mechanical force amplification, forming a reliable and uniform high-pressure seal, effectively preventing impurities from entering and lubricant from leaking.
[0010] 3. This utility model solves the problem that traditional integrated dust covers have simple structures but are difficult to balance in terms of fixing and sealing performance by using independent mechanical fixing components to lock the lower end and seal the upper end of the dust cover. It achieves a stable overall structure, a long-lasting and reliable sealing effect, and the ability to adapt to harsh working conditions, thereby effectively extending the service life of the automotive ball joint. Attached Figure Description
[0011] Figure 1 This is a perspective view of a dustproof sealing structure for an automotive ball joint according to the present invention. Figure 2 This is a schematic diagram of the spherical structure of a dustproof sealing structure for an automotive ball pin proposed in this utility model; Figure 3 This is a schematic diagram of the positioning component structure of a dustproof sealing structure for an automotive ball pin proposed in this utility model; Figure 4 This is a schematic diagram of the sealing component structure of a dustproof sealing structure for an automotive ball pin proposed in this utility model; Figure 5 This is a schematic diagram of the tightening component structure of a dustproof sealing structure for an automotive ball pin proposed in this utility model.
[0012] Legend: 1. Ball head seat; 2. Connecting rod; 3. Dust cover; 4. Sealing assembly; 401. Clamping plate; 402. Rotating shaft; 403. Sealing ring; 404. Rubber body; 405. Side plate; 406. Tightening component; 5. Positioning assembly; 501. Resistance rod; 502. Connecting ring; 503. Slide groove; 504. Positioning groove; 505. Positioning ring; 6. Spherical shape. Detailed Implementation
[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0014] Reference Figures 1-5The present invention provides an embodiment of a dustproof sealing structure for an automotive ball joint, comprising a ball head seat 1, a ball 6 installed inside the ball head seat 1, a connecting rod 2 connected to the ball 6, and a dust cover 3 covering the ball 6 and part of the connecting rod 2. To achieve a stable connection and seal between the dust cover 3 and the ball head seat 1 and the connecting rod 2, a positioning component 5 and a sealing component 4 are also included. The positioning component 5 is fixed to the lower end of the dust cover 3 to lock the dust cover 3 to the ball head seat 1, and the sealing component 4 is disposed at the upper end of the dust cover 3 to clamp the upper end of the dust cover 3 onto the connecting rod 2. Specifically, the positioning component 5 includes a connecting ring 502, which is fixedly connected to the lower end of the dust cover 3. The bottom of the connecting ring 502 is provided with a positioning ring 505, which is an annular protrusion. During installation, the positioning ring 505 is inserted into the positioning groove 504 opened on the ball head seat 1. The positioning groove 504 is an annular groove that matches the annular protrusion. The inner side of the connecting ring 502 is provided with a resistance rod 501, which is a plate-shaped structure and has a high friction surface. After assembly, the resistance rod 501 is received in the sliding groove 503 opened on the inner wall of the ball head seat 1. The sliding groove 503 extends along the circumference of the ball head seat 1, and the resistance rod 501 forms a friction fit with the inner wall of the sliding groove 503. The sealing assembly 4 includes a sealing ring 403, a tightening member 406, and a side plate 405. The sealing ring 403 is fixedly connected to the upper end of the dust cover 3. A clamping plate 401 is rotatably connected to the sealing ring 403 via a rotating shaft 402. A rubber body 404 is provided on the inner side of the clamping plate 401. The rubber body 404 is integrally formed on the inner side of the clamping plate 401 facing the connecting rod 2. The tightening member 406 is connected to the side plate 405 in a transmission manner. The tightening member 406 is a threaded member, and the tightening member 406 is threadedly engaged with the side plate 405. The side plate 405 abuts against the outer side of the clamping plate 401 away from the connecting rod 2. Furthermore, the side plate 405 is provided with an abutting part, which is used to push the outer side of the clamping plate 401. At the same time, the outer side of the clamping plate 401 is provided with a pushing surface that cooperates with the side plate 405 or the abutting part. The positioning component 5 includes a connecting ring 502 fixedly connected to the lower opening of the dust cover 3. The bottom of the connecting ring 502 extends downward to form a positioning ring 505. The positioning ring 505 has an annular protrusion structure. In the assembled state, the positioning ring 505 and the positioning groove 504 on the ball head seat 1 form an insertion fit. The positioning groove 504 is an annular groove that matches the annular protrusion structure of the positioning ring 505. This insertion structure provides preliminary radial and axial positioning for the dust cover 3. The connecting ring 502 can also slide inside the connecting ring 502. A resistance rod 501 is provided, which is a plate-shaped structure and has a high-friction surface on its outer surface. After the dust cover 3 is positioned by the positioning ring 505 and the positioning groove 504, the resistance rod 501 is moved into the sliding groove 503 opened in the inner wall of the ball head seat 1. The high-friction surface of the resistance rod 501 forms a friction fit with the inner wall of the sliding groove 503. This dual fixing structure, which combines insertion pre-positioning and friction self-locking, ensures that the lower end of the dust cover 3 will not come loose from the ball head seat 1 when subjected to vibration and external force. The sealing assembly 4 includes a sealing ring 403 fixedly connected to the upper opening of the dust cover 3. A rotating shaft 402 is fixed on the sealing ring 403. The clamping plate 401 is rotatably connected to the sealing ring 403 through the rotating shaft 402. The tightening member 406 is a threaded member. The tightening member 406 and the side plate 405 are connected by a threaded engagement. The side plate 405 is provided with an abutting part. The abutting part of the side plate 405 abuts against the outer side of the clamping plate 401 away from the connecting rod 2. The outer surface of the clamping plate 401 is provided with a pressing surface that cooperates with the abutting part. When the tightening member 406 is rotated, the side plate 405 is displaced. The abutting part of the side plate 405 pushes the pressing surface of the clamping plate 401, causing the clamping plate 401 to rotate inward around the rotating shaft 402, thereby clamping the connecting rod 2 and simultaneously compressing the rubber body 404 integrally formed on the inner side of the clamping plate 401. This mechanical force-increasing clamping structure can form a strong and uniform sealing pressure at the upper end of the dust cover 3. The groove 503 extends circumferentially along the ball joint 1. This design allows the resistance rod 501 to have a longer contact stroke and a larger contact area after insertion, resulting in a more stable frictional locking force. To further improve the frictional performance of the resistance rod 501, the resistance rod 501 has a plate-like structure, and a high-friction surface is provided on the surface where the resistance rod 501 contacts the groove 503. This high-friction surface can be a roughened surface or a coating with a high-friction coefficient material. To ensure the firmness of the connection between the rubber body 404 and the clamping plate 401 and to simplify assembly, the rubber body 404 is directly cured on the inner side of the clamping plate 401 facing the connecting rod 2 by integral molding. The tightening member 406 is a threaded member, and the tightening member 406 is connected to the side plate 401. 5. Through threaded connection, the rotational motion can be converted into linear displacement of the side plate 405 by rotating the threaded part, thereby pushing the clamping plate 401. In order to optimize the force transmission effect between the side plate 405 and the clamping plate 401, the side plate 405 is specially provided with an abutment part. The abutment part is a structure protruding from the main body of the side plate 405, which is used to act precisely on the outside of the clamping plate 401. A pushing surface that cooperates with the side plate 405 or the abutment part is provided at the corresponding position on the outside of the clamping plate 401. The pushing surface can be a smooth contact surface or a concave surface that matches the shape of the abutment part. In order to make the fit between the positioning ring 505 and the positioning groove 504 more precise and stable, the structure of the positioning ring 505 is designed as an annular protrusion, and the positioning groove 504 is an annular groove that matches the shape and size of the annular protrusion.
[0015] Working principle: When installing the dust cover 3, first align the positioning ring 505 at the bottom of the connecting ring 502 of the positioning component 5 with the positioning ring 505 and insert it into the positioning groove 504 opened on the ball head seat 1 to complete the initial alignment. Then, move the resistance rod 501 on the inner side of the connecting ring 502 so that the resistance rod 501 enters the sliding groove 503 on the inner wall of the ball head seat 1. Since the resistance rod 501 has a high friction surface, a strong frictional force is generated between the resistance rod 501 and the sliding groove 503, thereby firmly locking the lower end of the dust cover 3 on the ball head seat 1, effectively resisting the vibration and external impact from the vehicle during driving. When sealing the upper end of the dust cover 3, operate the tightening member 406, for example, rotate the tightening member 406 as a threaded member. Through the threaded engagement and transmission connection between the tightening member 406 and the side plate 405, the side plate 405 is driven to move. The abutting part on the side plate 405 pushes the pressing surface of the clamping plate 401. This thrust causes the clamping plate 401 to rotate inward around the rotating shaft 402, thereby clamping the connecting rod 2 and squeezing the rubber body 404 on the inner side of the clamping plate 401. After the rubber body 404 is deformed, it fills all gaps and forms a reliable sealing barrier around the connecting rod 2.
Claims
1. A dustproof sealing structure for an automotive ball joint, comprising: A ball head seat (1), a sphere (6) installed inside the ball head seat (1), a connecting rod (2) connected to the sphere (6), and a dust cover (3) covering the sphere (6) and part of the connecting rod (2); characterized in that it further includes a positioning component (5) and a sealing component (4), the positioning component (5) being fixed to the lower end of the dust cover (3), and the sealing component (4) being disposed at the upper end of the dust cover (3); The positioning component (5) includes a connecting ring (502), which is fixedly connected to the lower end of the dust cover (3). The bottom of the connecting ring (502) is provided with a positioning ring (505), which is inserted into the positioning groove (504) opened on the ball head seat (1). The inner side of the connecting ring (502) is provided with a resistance rod (501), which is received in the sliding groove (503) opened on the inner wall of the ball head seat (1), and the resistance rod (501) is in frictional engagement with the inner wall of the sliding groove (503). The sealing assembly (4) includes a sealing ring (403), a tightening member (406), and a side plate (405). The sealing ring (403) is fixedly connected to the upper end of the dust cover (3). A clamping plate (401) is rotatably connected to the sealing ring (403) via a rotating shaft (402). A rubber body (404) is provided on the inner side of the clamping plate (401). The tightening member (406) is connected to the side plate (405) in a transmission manner. The side plate (405) abuts against the outside of the clamping plate (401) away from the connecting rod (2).
2. The dustproof sealing structure for an automotive ball joint according to claim 1, characterized in that: The groove (503) extends circumferentially along the ball head seat (1).
3. The dustproof sealing structure for an automotive ball joint according to claim 1, characterized in that: The resistance rod (501) has a plate-like structure and a high-friction surface.
4. The dustproof sealing structure for an automotive ball joint according to claim 1, characterized in that: The rubber body (404) is integrally formed on the inner side of the clamp (401) facing the connecting rod (2).
5. The dustproof sealing structure for an automotive ball joint according to claim 1, characterized in that: The tightening member (406) is a threaded member, and the tightening member (406) is threadedly engaged with the side plate (405).
6. The dustproof sealing structure for an automotive ball joint according to claim 1, characterized in that: The side plate (405) is provided with an abutment portion, which is used to push the outer side of the clamp (401).
7. The dustproof sealing structure for an automotive ball joint according to claim 6, characterized in that: The outer side of the clamp (401) is provided with a pressing surface that cooperates with the side plate (405) or the abutment portion.
8. The dustproof sealing structure for an automotive ball joint according to claim 1, characterized in that: The positioning ring (505) is an annular protrusion, and the positioning groove (504) is an annular groove that matches the annular protrusion.