Control arm assembly with improved stability of use
By combining an asymmetric stress relief groove and a PTC ceramic heating element, the fatigue problem caused by stress concentration in the control arm assembly is solved, achieving stress dispersion and improved stability, and extending service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YUHUAN LETENG MACHINERY MFG CO LTD
- Filing Date
- 2025-07-01
- Publication Date
- 2026-06-19
AI Technical Summary
Existing automotive control arm assemblies are prone to fatigue under stress concentration, which reduces their service life, and they lack stress dispersion function.
An asymmetric stress relief groove design is adopted, which disperses the stress in the high stress area to the low stress area through the combination of connecting screw and flat nut. Combined with PTC ceramic heating element, the elastic modulus stability of bushing is maintained. The wall thickness difference at both ends of the control arm is designed to absorb impact energy.
It effectively reduces peak stress by more than 40%, extends fatigue life, reduces the risk of stress mutation, and improves service stability.
Smart Images
Figure CN224375261U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of automotive parts technology, and specifically relates to a control arm assembly that can improve the stability of use. Background Technology
[0002] The vehicle control arm is used to connect the wheel bracket to the front subframe, allowing the wheel a certain amount of room to roll and bounce relative to the vehicle body, while also ensuring a reliable connection with the subframe. It is an important component of the vehicle suspension.
[0003] For example, Chinese patent literature discloses a durable automobile control arm assembly [Application No.: 202421331029.3; Authorization Announcement No.: CN222451880U], which includes a fixing frame with a connecting hole 1 and a connecting hole 2. A rubber sleeve 1 and a rubber sleeve 2 are installed on the connecting hole 1 and the connecting hole 2. The rubber sleeve 1 and the rubber sleeve 2 are interference-fitted with the connecting hole 1 and the connecting hole 2. The rubber sleeve 1 is composed of an outer bushing 1, a rubber body 1 and an inner bushing 1. The rubber sleeve 2 is composed of an outer bushing 2, a rubber body 2 and an inner bushing 2. A flange 1 and a flange 2 are provided on the connecting hole 1 and the connecting hole 2. A movable groove 1 and a movable groove 2 are provided on the rubber body 1. A movable groove 3 is provided on the rubber body 2.
[0004] In the aforementioned durable automotive control arm assembly, the rubber sleeve and the fixing bracket are interference-fitted, which not only ensures a tight connection but also facilitates disassembly and assembly. The opening of the movable groove facilitates the movement of the rubber body and improves its service life. However, it does not have the function of dispersing stress, which means that the stress in the high-stress area cannot be dispersed to the low-stress area, which can easily cause fatigue in the control arm assembly and reduce its service life. Summary of the Invention
[0005] The purpose of this invention is to address the aforementioned problems in the prior art by providing a control arm assembly that can distribute stress and improve operational stability.
[0006] The objective of this utility model can be achieved through the following technical solution: a control arm assembly that improves the stability of use, comprising a connector assembly and a bushing, wherein a connecting arm is connected to the right side of the connector assembly, a connecting screw rod one is connected to the right side of the connecting arm, a threaded sleeve body is connected to the left side of the bushing, and a connecting screw rod two is connected to the left side of the threaded sleeve body, a welding body is threaded on the outside of the connecting screw rod one and the connecting screw rod two, and several stress relief grooves are provided on the connecting screw rod one and the connecting screw rod two, and a flat nut is threaded on the outside of the connecting screw rod one and the connecting screw rod two.
[0007] The control arm assembly, which can improve the stability of use, has the advantage of stress dispersion. It adopts an asymmetrical stress relief groove, which breaks the stress concentration mode of the traditional symmetrical structure, disperses the stress in the high stress area to the low stress area, reduces the peak stress by more than 40%, and extends the fatigue life. Furthermore, the stress relief groove design makes the wall thickness of the two ends of the control arm different, which generates gradient deformation when under pressure, effectively absorbs impact energy, reduces the risk of stress change, and improves the stability of use.
[0008] In the aforementioned control arm assembly designed to improve operational stability, the two flat nuts are positioned so that their opposite sides contact the left and right sides of the welding body. These two flat nuts allow for the positioning of the welding body, preventing it from rotating unnecessarily.
[0009] In the aforementioned control arm assembly designed to improve operational stability, several stress relief grooves are arranged asymmetrically. By employing asymmetrical stress relief grooves, the stress concentration pattern of traditional symmetrical structures is broken, dispersing the peak stress in high-stress areas to low-stress areas.
[0010] In the aforementioned control arm assembly designed to improve operational stability, mounting grooves are provided on both sides of the top and bottom of the bushing, and PTC ceramic heating elements are installed inside these grooves. The PTC ceramic heating elements help maintain the stability of the bushing's elastic modulus at low temperatures during operation.
[0011] In the aforementioned control arm assembly designed to improve operational stability, a sealing plug is threaded onto the side of the mounting groove's inner wall furthest from the PTC ceramic heating element. This sealing plug provides a seal to the mounting groove, preventing the PTC ceramic heating element from being exposed.
[0012] Compared with existing technologies, the control arm assembly, which can improve the stability of use, has the advantage of stress dispersion. It adopts an asymmetric stress relief groove, which breaks the stress concentration mode of the traditional symmetrical structure, disperses the stress in the high stress area to the low stress area, reduces the peak stress by more than 40%, and extends the fatigue life. Furthermore, the stress relief groove design makes the wall thickness of the two ends of the control arm different, which generates gradient deformation when under pressure, effectively absorbs impact energy, reduces the risk of stress change, and improves the stability of use. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of this utility model.
[0014] Figure 2 This is a utility model Figure 1 Top view.
[0015] Figure 3 This is a utility model Figure 1 A magnified view of A in the middle.
[0016] In the diagram: 1. Connector assembly; 2. Welding body; 3. Threaded sleeve body; 4. Bushing; 5. Connecting arm; 6. Flat nut; 7. Connecting screw one; 8. Connecting screw two; 9. Mounting groove; 10. Sealing plug; 11. PTC ceramic heating element; 12. Stress relief groove. Detailed Implementation
[0017] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.
[0018] like Figure 1 , Figure 2 and Figure 3 As shown, the control arm assembly that can improve the stability of use includes a connector assembly 1 and a bushing 4. A connecting arm 5 is connected to the right side of the connector assembly 1, and a connecting screw 7 is connected to the right side of the connecting arm 5. A threaded sleeve body 3 is connected to the left side of the bushing 4, and a connecting screw 8 is connected to the left side of the threaded sleeve body 3. A welding body 2 is threaded on the outside of the connecting screw 7 and the connecting screw 8. Several stress relief grooves 12 are opened on the connecting screw 7 and the connecting screw 8. A flat nut 6 is threaded on the outside of the connecting screw 7 and the connecting screw 8.
[0019] To elaborate further, the two flat nuts 6 are in contact with the left and right sides of the welded body 2 on opposite sides. Several stress relief grooves 12 are arranged asymmetrically.
[0020] The bushing 4 has mounting grooves 9 on both sides of its top and bottom, and a PTC ceramic heating element 11 is installed inside the mounting groove 9. A sealing plug 10 is threaded onto the side of the inner wall of the mounting groove 9 away from the PTC ceramic heating element 11.
[0021] In use, an asymmetrical stress relief groove 12 is employed, breaking the stress concentration pattern of traditional symmetrical structures. This disperses stress from high-stress areas to low-stress areas, reducing peak stress by more than 40% and extending fatigue life. Furthermore, the stress relief groove 12 design differentiates the wall thickness at both ends of the control arm, generating gradient deformation under pressure. This effectively absorbs impact energy, reduces the risk of sudden stress changes, and improves operational stability. Through the combined use of the mounting groove 9, sealing plug 10, and PTC ceramic heating element 11, the PTC ceramic heating element 11 generates heat, maintaining the stability of the bushing 4's elastic modulus even at low temperatures.
[0022] Contents not described in detail herein are existing technologies known to those skilled in the art. The specific embodiments described herein are merely illustrative examples illustrating the spirit of this invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this invention or exceeding the scope defined by the appended claims.
Claims
1. A control arm assembly with improved stability of use, comprising a joint assembly (1) and a bushing (4), characterized in that: The connector assembly (1) is connected to a connecting arm (5) on the right side, and a connecting screw (7) is connected to the right side of the connecting arm (5). The bushing (4) is connected to a threaded sleeve body (3) on the left side, and a connecting screw (8) is connected to the left side of the threaded sleeve body (3). The connecting screw (7) and the connecting screw (8) are threaded together with a welding body (2). The connecting screw (7) and the connecting screw (8) are provided with several stress relief grooves (12). The connecting screw (7) and the connecting screw (8) are threaded together with flat nuts (6).
2. The control arm assembly of claim 1, wherein: The two flat nuts (6) are in contact with the left and right sides of the welding body (2) on opposite sides.
3. The control arm assembly of claim 1, wherein: Several stress relief grooves (12) are arranged asymmetrically.
4. The control arm assembly of claim 1, wherein: The bushing (4) has mounting grooves (9) on both sides of the top and bottom, and a PTC ceramic heating element (11) is installed inside the mounting groove (9).
5. The control arm assembly of claim 4, wherein: A sealing plug (10) is threaded onto the side of the inner wall of the mounting groove (9) away from the PTC ceramic heating element (11).