Connecting structure of auxiliary frame and rear sleeve
By dividing the subframe and the rear casing into a connection structure of the pad plate and the intermediate liner, the problem of insufficient connection strength is solved, high-strength connection is achieved and mold cost is reduced.
Patent Information
- Application Number
- CN202421771858.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-25
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-07-25
AI Technical Summary
In the prior art, the connection strength between the subframe and the rear casing is insufficient, resulting in the weld being dissatisfied with welding, and there is a risk of cracking, and the existing connection method increases the cost of the mold.
The rear casing is divided into a pad plate and an intermediate liner tube. The pad plate is welded to the upper plate, and the middle liner tube is welded to the lower plate. Both welds are fully welded and fixed by bolts. The improved connecting structure, the intermediate liner tube and the pad plate are separated from the mold, simplifying the mold design and reducing costs.
High-strength connection is achieved, stress requirements are met, cracking risks are avoided, and mold costs are reduced.
Smart Images
Figure CN223116441U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of automotive parts, and particularly relates to a connection structure between a subframe and a sleeve. Background Art
[0002] The front subframe is an important part of the MacPherson front suspension. Its function is to connect the vehicle body, front swing arm, stabilizer bar, steering gear, mount, exhaust pipe, wire harness, underbody shield, etc., and transfer the force and torque between the vehicle body and the wheels. The connection method between the subframe and the vehicle body is divided into soft connection and hard connection. The soft connection is to connect the subframe to the vehicle body through the bushing assembly on the subframe, and the hard connection is to connect the subframe to the vehicle body through the sleeve on the subframe. Based on cost considerations, most current front subframes are connected to the vehicle body by hard connection.
[0003] Such as Figures 1-3 , it is the connection structure between the subframe and the rear sleeve 3 in the prior art. The subframe includes an upper plate 1 and a lower plate 2. The upper end of the rear sleeve 3 is provided with a limiting flange, forming a stepped sleeve with a larger upper part and a smaller lower part that is integrally formed. Due to the limiting flange at the upper end of the rear sleeve 3, during assembly, it is necessary to first weld the upper and lower plates together, then pass the rear sleeve 3 through the through hole of the upper plate 1 from top to bottom, weld and fix the limiting flange of the rear sleeve 3 to the upper plate 1, and finally weld the lower end of the rear sleeve 3 to the lower plate 2. When welding the rear sleeve 3 to the lower plate 2, since the rear sleeve 3 is located between the upper and lower plates, affected by the position structure, the lower plate 2 and the rear sleeve 3 cannot achieve full welding (see Figure 2 ), and the weld 4 of the lower plate 2 can only reach half a circle, resulting in low connection strength and not meeting the stress requirements. Excessive stress may cause the subframe to crack. Therefore, in view of the above structure, an optimized solution is urgently needed to meet the strength requirements without increasing costs. Summary of the Invention
[0004] The purpose of the utility model is to address the problems existing in the prior art and propose a connection structure between the subframe and the rear sleeve. In this connection structure, the rear sleeve is divided from the integrally formed structure into a backing plate and an intermediate lining tube. At the same time, an upward positioning flange is provided on the upper plate. The backing plate is in clearance fit with the positioning flange and then welded and fixed. The intermediate lining tube is arranged between the upper and lower plates, with the upper end contacting the upper plate and the lower end welded and fixed to the lower plate. The rear sleeve is used to be fixed to the vehicle body through bolts. In this connection structure, the backing plate is welded to the upper plate, and the intermediate lining tube is welded to the lower plate. Both welds are full welds, with high connection strength and sufficient to meet the requirements. After the improvement, the intermediate lining tube and the backing plate are separated, and the corresponding two sleeve molds are also separated, resulting in a lower cost compared to the cold heading mold of the integrally formed stepped sleeve before the improvement. The positioning flange of the upper plate is formed by stamping the first through hole, and the operation process is simple.
[0005] The purpose of the utility model is achieved as follows.
[0006] A connecting structure between a subframe and a rear sleeve, comprising an upper plate and a lower plate of the subframe with a "U"-shaped cross-section. A first through-hole is provided in the transverse connecting part of the upper plate, and a second through-hole is provided in the transverse connecting part of the lower plate. A positioning flange extending upward is provided at the upper end of the first through-hole. A middle lining tube is welded to the upper end of the second through-hole of the lower plate. A circular pad is sleeved on the positioning flange of the first through-hole of the upper plate, and the pad is fixedly welded to the upper plate. The central axes of the first through-hole, the middle lining tube, and the second through-hole are on the same straight line. The mouth ends of the upper plate and the lower plate are fixedly welded facing each other, so that the upper end of the middle lining tube contacts the upper plate and is fixed between the upper plate and the lower plate. The middle lining tube is used to support the upper plate and the lower plate and guide the bolt to pass through.
[0007] Further, anti-slip teeth are provided on the upper end surface of the pad.
[0008] Furthermore, the thickness of the pad is greater than or equal to the height of the positioning flange.
[0009] Further, the lower end circumference of the middle lining tube is welded to the lower plate all around.
[0010] Further, the positioning flange is formed by stamping the upper plate.
[0011] The connecting structure between the subframe and the rear sleeve of the present utility model has a simple structure, high connecting strength, and does not increase the cost. Description of the Drawings
[0012] Figure 1 is the connecting structure between the subframe and the rear sleeve of the prior art.
[0013] Figure 2 is Figure 1 the enlarged view of part A in
[0014] Figure 3 is Figure 2 the schematic diagram of the rear sleeve separation structure in
[0015] Figure 4 is the exploded view of the present utility model.
[0016] Figure 5 is Figure 4 the enlarged view of part B in
[0017] Description of the reference numerals: upper plate 1, lower plate 2, rear sleeve 3, weld seam 4, pad 5, middle lining tube 6, first through-hole 7a, second through-hole 7b, anti-slip teeth 8, positioning flange 9. Detailed Description of the Invention
[0018] See Figures 4 to 5, a connecting structure between a subframe and a rear sleeve, comprising an upper plate 1 and a lower plate 2 with a "U"-shaped cross-section of the subframe. A first through-hole 7a is provided at the transverse connecting portion of the upper plate 1, and a second through-hole 7b is provided at the transverse connecting portion of the lower plate 2. A positioning flange 9 extending upward is provided at the upper end of the first through-hole 7a. In this embodiment, the positioning flange 9 is formed by stamping the upper plate 1.
[0019] A middle lining tube 6 is welded to the upper end of the second through-hole 7b of the lower plate 2. The lower end circumference of the middle lining tube 6 is welded to the lower plate 2 to form a full weld, and the welding method is T-shaped welding. A circular ring-shaped backing plate 5 is sleeved on the positioning flange 9 of the first through-hole 7a of the upper plate 1. Anti-slip teeth 8 are provided on the upper end surface of the backing plate 5. The thickness of the backing plate 5 is greater than or equal to the height of the positioning flange 9. The backing plate 5 is welded and fixed to the upper plate 1. The central axes of the first through-hole 7a, the middle lining tube 6, and the second through-hole 7b are on a straight line. The mouths of the upper plate 1 and the lower plate 2 face each other and are fixed by welding, so that the upper end of the middle lining tube 6 contacts the upper plate 1 and is fixed between the upper plate 1 and the lower plate 2. The middle lining tube 6 is used to support the upper plate 1 and the lower plate 2 and guide the bolt to pass through.
[0020] For the connecting structure between the subframe and the rear sleeve of the present invention, the welding sequence is as follows: the middle lining tube 6 is fully welded to the lower plate 2, the upper plate 1 is assembled, the upper plate 1 and the lower plate 2 are welded, and finally the backing plate 5 is assembled. The backing plate 5 is arranged on the outer wall of the positioning flange 9, and the backing plate 5 is fully welded to the upper plate 1 for welding and fixing.
[0021] In this connecting structure, the upper end surfaces of the rear sleeves 3 before and after improvement both need to be processed with anti-slip teeth 8 first, and then the hardness and wear resistance of the anti-slip teeth 8 are improved through heat treatment. Because after the subframe and the vehicle body are assembled, the anti-slip teeth 8 will contact the vehicle body mounting surface. The structure of the anti-slip teeth 8 can increase friction, prevent the relative friction between the rear sleeve 3 and the vehicle body mounting surface, and avoid product abnormal noise. The rear sleeve 3 before improvement is a stepped sleeve with a large upper part and a small lower part formed integrally. During heat treatment, the entire rear sleeve 3 needs to be heat-treated, while the improved rear sleeve 3 is divided into a middle lining tube 6 and a backing plate 5. During heat treatment, only the backing plate 5 needs to be heated separately, the cost is reduced, and the cold heading die is also divided into two dies for straight sleeves. Compared with the stepped sleeve, the die cost is reduced. For the connecting structure between the subframe and the rear sleeve of the present invention, the backing plate 5 is welded to the upper plate 1, and the middle lining tube 6 is welded to the lower plate 2. Both welds are full welds, and the connection strength is high, meeting the strength requirements.
[0022] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Those skilled in the art, without departing from the spirit of the present invention, make changes to the present invention, which all fall within the protection scope of the present invention.
Claims
1. A connecting structure between a subframe and a rear sleeve, comprising an upper plate (1) and a lower plate (2) of the subframe with a "U"-shaped cross-section. A first through hole (7a) is provided at the transverse connecting portion of the upper plate (1), and a second through hole (7b) is provided at the transverse connecting portion of the lower plate (2). It is characterized in that: The upper end of the first through hole (7a) is provided with a positioning flange (9) extending upward; a middle liner (6) is welded to the upper end of the second through hole (7b) of the lower plate (2). A circular backing plate (5) is sleeved on the positioning flange (9) of the first through hole (7a) of the upper plate (1). The backing plate (5) is fixedly welded to the upper plate (1). The central axes of the first through hole (7a), the middle liner (6), and the second through hole (7b) are located on a straight line. The mouths of the upper plate (1) and the lower plate (2) face each other and are fixedly welded, so that the upper end of the middle liner (6) contacts the upper plate (1) and is fixed between the upper plate (1) and the lower plate (2). The middle liner (6) is used to support the upper plate (1) and the lower plate (2) and guide the bolts to pass through.
2. The connecting structure of the subframe and the rear sleeve according to claim 1, characterized in that: The upper end surface of the backing plate (5) is provided with anti-slip teeth (8).
3. The connection structure between the subframe and the rear sleeve according to claim 1 or 2, characterized in that: The thickness of the backing plate (5) is greater than or equal to the height of the positioning flange (9).
4. The connection structure between the subframe and the rear sleeve according to claim 1, characterized in that: The lower end circumference of the middle liner (6) is welded to the lower plate (2) all around.
5. The connection structure between the subframe and the rear sleeve according to claim 1, wherein: The positioning flange (9) is formed by stamping the upper plate (1).