Automobile control arm

Abstract

The utility model discloses an automobile control arm which comprises an arm body and a ball head assembly arranged at one end of the arm body, the ball head assembly comprises a ball shell, an upper ball seat, a lower ball seat and ball head pins, the upper ball seat and the lower ball seat are arranged in the ball shell, and the ball head pins are arranged in the upper ball seat and the lower ball seat. A threaded section is arranged on the inner circumferential wall of the spherical shell and is in threaded fit connection with the outer circumferential wall of the fine adjustment threaded sleeve, conical surfaces matched with each other are arranged on the inner circumferential wall of the fine adjustment threaded sleeve and the outer circumferential wall of the lower ball seat, and a plurality of U-shaped contraction grooves are formed in the conical surface of the lower ball seat around the central axis. And the fine adjustment screw sleeve extrudes the lower ball seat through the conical surface to radially contract the lower ball seat when rotating. The structure can compensate the abrasion clearance without increasing the axial size, and the steering stability is better.

Description

Technical Field

[0001] The utility model relates to the field of automobile accessories, in particular to an automobile control arm. Background Art

[0002] The control arm is an important part of the automobile suspension system. The control arm is usually equipped with a ball head and bushing structure connected to the vehicle body for shock absorption and buffering. The ball head structure will inevitably wear out due to the increased friction between the ball pin and the ball seat during long-term use, causing the ball pin or the ball seat to loosen, resulting in instability when the ball head rotates, affecting the stability of the wheel jumping up and down and steering movement.

[0003] For example, a Chinese patent (Announcement No.: CN217603161U) discloses an automatic wear compensation device for a steering ball pin of a mining vehicle, including a bearing seat, an inner bearing, a first outer bearing, a second outer bearing, and a first spring. The bearing seat is provided with a bearing cavity, and the end face of the upper opening of the bearing cavity is provided with a bearing cover threaded hole. The upper opening is provided with a bearing cover, and the bearing cover is provided with a connecting through hole. The bolt passes through the connecting through hole and is connected to the threaded hole of the bearing cover; a closing edge is provided at the lower opening, and the first outer bearing and the second outer bearing are installed in the bearing cavity, and the first outer bearing is located at the lower part of the second outer bearing; the first outer bearing and the second outer bearing surround an open spherical cavity, and a bearing gap is left between the first outer bearing and the second outer bearing; a spherical end is provided at the end of the inner bearing, and the spherical end is installed in the open spherical cavity, and a first spring is placed on the top end face of the second outer bearing. However, in the above structure, although the wear gap compensation can be achieved by using the action of the spring, the axial size is large and when the load is large, the spring is compressed, resulting in a large axial displacement of the ball pin and poor handling stability. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the above problems and provide a vehicle control arm with better steering stability, which reduces the axial size on the basis of ensuring the wear clearance compensation function.

[0005] The technical solution of the utility model is:

[0006] The utility model discloses an automobile control arm, comprising an arm body and a ball head assembly arranged at one end of the arm body, wherein the ball head assembly comprises a ball shell, upper and lower ball seats arranged in the ball shell and ball head pins arranged in the upper and lower ball seats, and is characterized in that a fine-tuning screw sleeve is further provided between the ball shell and the lower ball seat, a threaded section is provided on the inner circumferential wall of the ball shell and is threadedly connected with the outer circumferential wall of the fine-tuning screw sleeve, the inner circumferential wall of the fine-tuning screw sleeve and the outer circumferential wall of the lower ball seat are provided with mutually matching conical surfaces, a plurality of U-shaped contraction grooves are provided on the conical surface of the lower ball seat on the central axis of the ring, and the fine-tuning screw sleeve squeezes the lower ball seat through the conical surface to make it contract radially when rotating.

[0007] The above structure utilizes the cooperation between the fine-tuning screw sleeve, the ball shell and the lower ball seat. When the wear gap between the ball stud and the upper and lower ball seats is too large, the fine-tuning screw sleeve is rotated to move it along the conical surface and gradually radially shrink the lower ball seat, thereby reducing the gap between the ball stud and the ball seat without increasing the axial dimension.

[0008] Furthermore, in the automobile control arm described in the utility model, the plurality of shrinkage grooves are evenly distributed along the conical surface of the lower ball seat to ensure uniform radial shrinkage deformation.

[0009] Furthermore, in the automobile control arm described in the utility model, the outer diameter of the conical surface of the lower ball seat gradually decreases from top to bottom, so as to achieve the purpose of contracting the lower ball seat when the fine-tuning screw sleeve moves upward toward the ball shell opening, without interfering with the rotation of the ball stud.

[0010] Furthermore, in the automobile control arm described in the utility model, the fine-tuning screw sleeve is made of plastic, which is low in cost and easy to process.

[0011] Furthermore, in the automobile control arm described in the utility model, an adjustment port is provided at the bottom of the ball shell, and a cover plate is connected to the adjustment port, so that the cover plate can be directly removed and adjusted directly from the bottom.

[0012] Furthermore, in the automobile control arm described in the utility model, a columnar hand-held portion is provided on the fine-tuning screw sleeve to facilitate the rotation adjustment operation.

[0013] Furthermore, in the automobile control arm described in the utility model, the bottom of the lower ball seat is concavely provided with a plurality of limiting grooves, the limiting grooves are radially extended inward from the outer edge of the bottom of the lower ball seat, and the inner wall of the ball shell is correspondingly provided with radially extending limiting ribs, and the lower ball seat is supported in the ball shell by the cooperation of the limiting ribs and the limiting grooves. The lower ball seat is supported on the limiting ribs of the ball shell and is circumferentially stopped to prevent the lower ball seat from rotating when the fine-tuning screw sleeve is rotated.

[0014] The beneficial effects of the utility model are:

[0015] The utility model realizes the contraction adjustment of the ball seat by the cooperation of the fine-tuning screw sleeve, the contraction groove and the conical surface, thereby compensating the wear clearance between the ball seat and the ball stud, avoiding the loosening of the ball stud due to excessive clearance, improving the steering stability, and basically not increasing the axial size additionally.

[0016] The utility model can ensure the stability of the installation position of the lower ball seat by adding limiting ribs and limiting groove structures between the ball seat and the ball shell, avoid the lower ball seat from rotating with the fine-tuning screw sleeve during the adjustment process, and improve the structural stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1This is a schematic diagram of the structure of Example 1.

[0018] Figure 2 This is a partial enlarged view of Example 1.

[0019] Figure 3 This is a three-dimensional schematic diagram of the lower ball seat described in Example 1.

[0020] Figure 4 This is a partial enlarged view of Example 2.

[0021] Figure 5 This is a three-dimensional schematic diagram of the lower ball seat described in Example 2. DETAILED DESCRIPTION

[0022] The utility model is now further described in conjunction with the accompanying drawings: Example

[0023] Reference Figure 1-Figure 3 As shown, the automobile control arm described in this embodiment includes an arm body 1, a ball head assembly arranged at one end of the arm body 1, and the ball head assembly includes a ball shell 2, an upper ball seat and a lower ball seat 3 arranged in the ball shell 2, and a ball head pin 4 arranged in the upper ball seat and the lower ball seat 3. A fine-tuning screw sleeve 5 made of plastic is also provided between the ball shell 2 and the lower ball seat 3. A threaded section is provided on the inner peripheral wall of the ball shell 2 and is threadedly connected with the outer peripheral wall of the fine-tuning screw sleeve 5. The inner peripheral wall of the fine-tuning screw sleeve 5 and the outer peripheral wall of the lower ball seat 3 are provided with mutually matching conical surfaces, and the outer diameter of the conical surface of the lower ball seat 3 gradually decreases from top to bottom.

[0024] The conical surface of the lower ball seat 3 is provided with a plurality of U-shaped contraction grooves 301 on the central axis of the ring, and the plurality of contraction grooves 301 are evenly distributed along the conical surface of the lower ball seat 3. When the fine-tuning screw sleeve 5 rotates, the conical surface squeezes the lower ball seat 3 to make it contract radially. In order to facilitate adjustment, in this embodiment, an adjustment port is provided at the bottom of the ball shell 2, and a cover plate 6 is connected to the adjustment port. A columnar hand-held portion 501 is provided on the fine-tuning screw sleeve 5.

[0025] In this embodiment, a shrinkage groove 301 is designed on the lower ball seat 3 so that it has the ability to shrink and deform radially, and a fine-tuning screw sleeve 5 is added between the ball shell 2 and the lower ball seat 3. When it is necessary to compensate for the wear gap, the fine-tuning screw sleeve 5 is unscrewed, so that the fine-tuning screw sleeve 5 gradually radially squeezes the lower ball seat 3 along the conical surface between the fine-tuning screw sleeve 5 and the lower ball seat 3 to radially tighten it, thereby preventing the ball head pin 4 from loosening or directly falling out, and does not increase the axial size, thereby improving the steering stability. Example

[0026] Reference Figure 4 and Figure 5This embodiment is basically the same as embodiment 1. The bottom of the lower ball seat 3 is concavely provided with a plurality of limiting grooves 8. The limiting grooves 8 extend radially inward from the outer edge of the bottom of the lower ball seat 3. The inner wall of the ball shell 2 is correspondingly provided with radially extending limiting ribs 7. The lower ball seat 3 is supported in the ball shell 2 by the cooperation between the limiting ribs 7 and the limiting grooves 8.

[0027] The present embodiment adds the limiting groove 8 and the limiting rib 7 structure, which mainly play the role of bottom support and circumferential stop for the lower ball seat 3, so as to enhance the installation stability of the lower ball seat 3 and prevent it from rotating with the fine-tuning screw sleeve 5.

[0028] The specific embodiments described herein are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. An automobile control arm, comprising an arm body, a ball head assembly arranged at one end of the arm body, the ball head assembly comprising a ball shell, upper and lower ball seats arranged in the ball shell, and ball head pins arranged in the upper and lower ball seats, characterized in that: A fine-tuning screw sleeve is also provided between the ball shell and the lower ball seat. A threaded section is provided on the inner circumferential wall of the ball shell and is threadedly connected with the outer circumferential wall of the fine-tuning screw sleeve. The inner circumferential wall of the fine-tuning screw sleeve and the outer circumferential wall of the lower ball seat are provided with mutually matching conical surfaces. A plurality of U-shaped contraction grooves are provided on the conical surface of the lower ball seat on the central axis of the ring. When the fine-tuning screw sleeve rotates, it squeezes the lower ball seat through the conical surface to cause it to contract radially.

2. The vehicle control arm according to claim 1, characterized in that: The plurality of contraction grooves are evenly distributed along the conical surface of the lower ball seat.

3. The vehicle control arm according to claim 1, characterized in that: The outer diameter of the conical surface of the lower ball seat gradually decreases from top to bottom.

4. The vehicle control arm according to claim 1, characterized in that: The fine-tuning screw sleeve is made of plastic.

5. The vehicle control arm according to claim 1, characterized in that: The bottom of the spherical shell is provided with an adjustment port, and a cover plate is connected to the adjustment port.

6. The vehicle control arm according to claim 1, characterized in that: A columnar hand-held portion is arranged on the fine-tuning screw sleeve.

7. The vehicle control arm according to claim 1, characterized in that: The bottom of the lower ball seat is concavely provided with a plurality of limiting grooves, and the limiting grooves extend radially inward from the outer edge of the bottom of the lower ball seat. The inner wall of the ball shell is correspondingly provided with radially extending limiting ribs, and the lower ball seat is supported in the ball shell by the cooperation of the limiting ribs and the limiting grooves.

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