Limiting and protecting structure applied to ball pin assembly

Abstract

The limiting and protecting structure applied to the ball pin assembly comprises a ball cup, a ball pin is movably arranged in the ball cup, and the ball pin comprises a spherical surface, a transition surface, a columnar surface and a conical surface which are sequentially arranged from bottom to top; the transition surface is of an inverted cone-shaped structure with a large upper end section and a small lower end section; the conical surface is of a positive conical structure with a small upper end section and a large lower end section; the spherical surface is embedded into the ball cup and then is sealed through the rear cover; the outer side of the ball pin is wrapped with a dust cover, the lower end of the dust cover is embedded in the upper end face of the ball cup, and the upper end face of the dust cover is movably arranged on the outer wall of the ball pin. And the transition surface is coated with a limiting protective sleeve. According to the limiting and protecting structure applied to the ball pin assembly, the compression stroke of the dust cover is limited, and the situation that the dust cover is not attached to the ball pin due to excessive compression is avoided; direct collision between the ball head and the ball head seat is avoided, the use stability of the ball pin assembly is improved, and the service life of the ball pin assembly is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of protection structures, in particular to a position limiting and protection structure applied to a ball pin assembly. Background Art

[0002] With the continuous development of society, the automobile industry has developed rapidly. There are many components of automobiles, and the ball pin assembly is an important component. The ball pin assembly is usually used in the automobile suspension system and steering system. Usually, the joint arm is connected to other components through the ball pin assembly to realize the up and down jumping and steering of the wheel. There are two different structures of the ball head assembly. One is a structure that uses a spiral spring for pre-compression and partial field wear; the other is a synthetic resin ball seat with elasticity and lubrication. These two structures generally have the following problems during long-term use: during assembly or use, the dust cover is compressed to a certain extent, detached from the cone surface of the ball head pin, and enters the transition surface between the cone surface and the spherical surface and cannot be restored. The lip of the dust cover is not tightly matched with the transition surface, and there is a possibility of entering debris, thereby accelerating the wear of the ball head pin; when the ball head pin swings to the limit position, the ball head collides with the ball head seat, affecting the mechanical properties of the ball head pin. Summary of the invention

[0003] The technical problem to be solved by the utility model is: in order to solve the problems existing in the above-mentioned background technology, a limiting and protective structure applied to a ball pin assembly is provided to limit the compression stroke of the dust cover, thereby avoiding the dust cover from not fitting with the ball pin due to excessive compression; avoiding possible direct collision between the ball head and the ball head seat, thereby improving the stability and service life of the ball pin assembly and facilitating its wide promotion and use.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a limiting and protective structure applied to a ball pin assembly, comprising a ball head seat, a ball pin movably arranged in the ball head seat, and the ball pin comprising a spherical surface, a transition surface, a cylindrical surface and a conical surface arranged in sequence from bottom to top; the transition surface is an inverted cone-shaped structure with a large upper end section and a small lower end section; the conical surface is a positive cone-shaped structure with a small upper end section and a large lower end section; the spherical surface is embedded in the ball head seat and sealed through a rear cover; a dust cover is provided on the outer side of the ball pin, the lower end of the dust cover is embedded in the upper end surface of the ball head seat, and the upper end surface of the dust cover is movably arranged on the outer wall of the ball pin; a limiting protective sleeve is provided on the transition surface.

[0005] To further illustrate, in the above technical solution, the lower end of the limit protection sleeve extends to the transition point between the spherical surface and the transition surface, and the upper end of the limit protection sleeve extends to the lower end of the cylindrical surface.

[0006] To further illustrate, in the above technical solution, the upper end of the limit protection sleeve extends outward to form an ear protector.

[0007] To further illustrate, in the above technical solution, the ear protector and the limiting protective cover are an integrated structure.

[0008] Further explanation, in the above technical solution, the joint arm is sleeved on the conical surface and fixedly connected by a slotted nut.

[0009] To further illustrate, in the above technical solution, one side of the ball head seat is connected to the ball head seat threaded section.

[0010] To further illustrate, in the above technical solution, an annular opening groove is provided at the upper end of the ball head seat, and the lower end of the dust cover is embedded in the annular opening groove.

[0011] To further illustrate, in the above technical solution, a ball bowl is also provided between the back cover and the spherical surface.

[0012] The beneficial effects of the utility model are as follows: the utility model proposes a limit and protection structure applied to the ball pin assembly, which limits the compression stroke of the dust cover, thereby avoiding the dust cover from not fitting with the ball pin due to excessive compression; avoiding possible direct collision between the ball head and the ball head seat, thereby improving the stability and service life of the ball pin assembly, and facilitating wide promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] 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 recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a structural diagram of a conventional ball pin assembly;

[0015] Figure 2 yes Figure 1 Structural schematic diagram of the axial movement of the middle dust cover;

[0016] Figure 3 yes Figure 1 A structural diagram of the middle ball pin in a swinging state;

[0017] Figure 1-3 The numbers in the figure are: A, slotted nut, B, ball pin, C, dust cover, D, ball head seat, E, back cover, F, ball bowl, G, ball head seat threaded section, H, joint arm, I, conical surface, J, transition surface, K, cylindrical surface, L, spherical surface.

[0018] Figure 4 It is a structural schematic diagram of the utility model.

[0019] Figure 4 The numbers in it are: 1. ball head seat, 2. spherical surface, 3. transition surface, 4. cylindrical surface, 5. conical surface, 6. back cover, 7. dust cover, 8. limit protection cover, 9. ear protector, 10. joint arm, 11. slotted nut, 12. ball head seat threaded section, 13. annular opening groove, 14. ball bowl. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0021] See Figure 1 The traditional ball pin assembly includes a slotted nut A, a ball pin B, a dust cover C, a ball head seat D, a rear cover E, a ball bowl F, a ball head seat threaded section G, a joint arm H, a conical surface I, a transition surface J, a cylindrical surface K and a spherical surface L.

[0022] See Figure 2 , the dotted line part indicates the trajectory of the axial movement of the dust cover C. The dust cover C prevents foreign matter from entering the ball pin assembly and causing wear, and plays a sealing role. Its lower part is fixedly connected to the ball head seat D, and its upper part is limited by the end face of the joint arm H and seals through the lip and the ball pin conical surface I. During assembly or use, after the dust cover C is compressed to a certain extent, it will break away from the ball pin conical surface I and enter the transition surface J between the conical surface I and the spherical surface L and cannot be restored. The lip of the dust cover 7 and the transition surface J are not tightly matched, and there is a possibility of foreign matter entering, thereby accelerating the wear of the ball pin.

[0023] See Figure 3 The arrow and dotted line in the figure indicate the trajectory of the ball pin's swing; when the ball pin swings to the extreme position, the ball head collides with the ball head seat, affecting the mechanical properties of the ball pin.

[0024] In the present application, the cylindrical surface 4 is the maximum diameter of the transition surface 3 and the conical surface 5. The upper part of the dust cover 7 is limited by the joint arm 10; the upper end of the dust cover 7 generates assembly pressure between the lip and the conical shaft through a clamp, forming a good sealing effect.

[0025] See Figure 4What is shown is a limiting and protective structure applied to a ball pin assembly, comprising a ball head seat 1, in which a ball pin is movably arranged, and the ball pin comprises a spherical surface 2, a transition surface 3, a cylindrical surface 4 and a conical surface 5 which are arranged in sequence from bottom to top; the transition surface 3 is an inverted cone-shaped structure with a large cross-section at the upper end and a small cross-section at the lower end; the conical surface 5 is a positive cone-shaped structure with a small cross-section at the upper end and a large cross-section at the lower end; the spherical surface 2 is embedded in the ball head seat 1 and sealed by a rear cover 6; a dust cover 7 is provided on the outer side of the ball pin, the lower end of the dust cover 7 is embedded in the upper end surface of the ball head seat 1, and the upper end surface of the dust cover 7 is movably arranged on the outer wall of the ball pin; a limiting protective sleeve 8 is provided on the transition surface 3.

[0026] Among them, the lower end of the limit protection sleeve 8 extends to the transition point between the spherical surface 2 and the transition surface 3, and the upper end of the limit protection sleeve 8 extends to the lower end of the cylindrical surface 4. The upper end of the limit protection sleeve 8 extends outward to form an ear protector 9. The ear protector 9 and the limit protection sleeve 8 are an integral structure. The joint arm 10 is sleeved on the conical surface 5 and fixedly connected by a slotted nut 11. One side of the ball head seat 1 is connected to the ball head seat threaded section 12. An annular opening groove 13 is provided at the upper end of the ball head seat 1, and the lower end of the dust cover 7 is embedded in the annular opening groove 13. A ball bowl 14 is also provided between the rear cover 6 and the spherical surface 2.

[0027] The operating principle of the limit and protection structure applied to the ball pin assembly is as follows:

[0028] The limiting protective sleeve 8 of the present application adopts a conical rotating thin-walled structure with a limiting flange, namely, an ear protector 9, which is directly inserted from the conical surface 5 during installation and cooperates with the transition surface 3; its structure adopts a conical structure, the lower position is the transition point of the ball head, and the upper position is the lower end of the cylindrical surface 4; it can play a limiting role: during the assembly or assembly process of the ball head, there is a possibility that the dust cover 7 is over-compressed and exceeds the limit position and cannot be reset. At this time, the dust cover 7 may enter impurities due to the inability to correctly assemble the upper ring and the ball head, thereby losing the sealing and protective function; after the limiting protective sleeve 8 is installed, the dust cover 7 cannot exceed the limit position due to the limiting effect of the limiting protective sleeve 8, the upper mouth of the dust cover 7 cooperates correctly with the conical surface, and the sealing and protective function is normally exerted; it can also play a protective role: during the operation of the whole vehicle, there is a possibility that the ball head may swing to the limit position relative to the ball head seat 1 and the two may collide, which will damage the ball head assembly, and the collision may cause debris to enter the ball head, accelerating the wear of the ball head. After the position limiting protective cover is installed, due to the protective effect of the position limiting protective cover 8, the ball head and the ball head seat cannot have direct contact, thereby improving the reliability of the ball head.

[0029] Compared with the traditional ball pin assembly structure, the present application has the following advantages: it can effectively prevent the dust cover 7 from being unable to reset due to overtravel during axial movement; it can effectively protect the ball head and avoid collision with the ball head seat; the limit protection sleeve 8 has a simple structure, easy installation, low cost, can be used by passing it on the conical surface 5, and is easy and quick to operate.

[0030] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A position limiting and protection structure for a ball pin assembly, comprising a ball seat, a ball pin movably arranged in the ball seat, the ball pin comprising a spherical surface, a transition surface, a cylindrical surface and a conical surface arranged in sequence from bottom to top; the transition surface is an inverted cone structure with a large upper end section and a small lower end section; the conical surface is a positive cone structure with a small upper end section and a large lower end section; the spherical surface is embedded in the ball seat and sealed by a rear cover; a dust cover is provided on the outer side of the ball pin, the lower end of the dust cover is embedded in the upper end surface of the ball seat, and the upper end surface of the dust cover is movably arranged on the outer wall of the ball pin; the characteristics are: The transition surface is covered with a limiting protective sleeve.

2. A limiting and protecting structure for a ball pin assembly according to claim 1, characterized in that: The lower end of the position-limiting protective sleeve extends to the transition point between the spherical surface and the transition surface, and the upper end of the position-limiting protective sleeve extends to the lower end of the cylindrical surface.

3. A limiting and protecting structure for a ball pin assembly according to claim 2, characterized in that: The upper end of the position limiting protective sleeve extends outward to form an ear protector.

4. A limiting and protecting structure for a ball pin assembly according to claim 3, characterized in that: The ear protector and the position limiting protective cover are an integrated structure.

5. The limiting and protecting structure for a ball pin assembly according to claim 1 is characterized in that: The joint arm is sleeved on the conical surface and fixedly connected via a slotted nut.

6. A limiting and protecting structure for a ball pin assembly according to claim 1, characterized in that: One side of the ball head seat is connected to the ball head seat threaded section.

7. The limiting and protecting structure for a ball pin assembly according to claim 1 is characterized in that: The upper end of the ball head seat is provided with an annular opening groove, and the lower end of the dust cover is embedded in the annular opening groove.

8. The limiting and protecting structure for a ball pin assembly according to claim 1 is characterized in that: A ball bowl is also arranged between the rear cover and the spherical surface.

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