Passenger car trailing arm structure

Abstract

The utility model discloses a passenger car trailing arm structure which comprises a trailing arm body, and the trailing arm body comprises a main body part, two control arms connected to one side of the main body part and a steering knuckle fixedly connected to the front end of the main body part. The control arm comprises a connecting arm and a lining, the connecting arm is fixedly connected to the main body part, the lining is fixedly connected to one end, far away from the main body part, of the connecting arm, the main body part, the connecting arm, the lining and the steering knuckle are integrally formed, and a shock absorber mounting groove is formed in the rear end of the main body part. The control arm and the steering knuckle are integrally designed with the main body part, so that a trailing arm in the traditional technology is replaced, the use of a connecting piece is reduced, the assembly process of a trailing arm suspension system of a rear wheel is reduced, the weight is greatly reduced, the development trend of light weight of a commercial vehicle is met, the assembly efficiency is improved, and the production cost is reduced; and meanwhile, the quality stability of the parts can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of trailing arms, in particular to a trailing arm structure of a passenger vehicle. Background Art

[0002] In recent years, with the rapid development of cities, the demand for convenient logistics in cities has increased. How to provide a passenger and cargo vehicle that is strong and durable, has a larger space, is low-cost and has good handling has become a research topic for major automobile manufacturers. For the domestic passenger and cargo vehicle market, the trailing arm suspension system of the rear wheel is strong and durable, with large space for the left and right wheels, and the camber angle of the body does not change, and the shock absorber does not have bending stress, so the friction is small, the transmission system can be designed to be more compact, the center of gravity can be lower, and the ride quality is good. This requires automobile suppliers to provide more efficient, reliable and safer high-quality casting parts.

[0003] At present, the trailing arm structure of passenger cars uses bolts and other connectors to connect the steering knuckle and the control arm, which need to be assembled during installation. This connection method requires a large number of parts, and the assembly process is complicated, and the processing and assembly precision is low. These factors have led to a reduction in the product performance of the trailing arm structure, and at the same time led to an increase in the comprehensive cost of the existing structure, and caused it to be heavy and not in line with the lightweight design. After the connector ages and fails, the trailing arm structure will cause relative displacement, affecting driving safety. Therefore, it is necessary to design a passenger car trailing arm structure to improve the above problems. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a trailing arm structure for a passenger vehicle to solve the deficiencies in the background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A passenger car trailing arm structure includes a trailing arm body, the trailing arm body includes a main body, two control arms connected to one side of the main body, and a steering knuckle fixedly connected to the front end of the main body, the control arm includes a connecting arm fixedly connected to the main body and a bushing fixedly connected to an end of the connecting arm away from the main body, the main body, the connecting arm, the bushing and the steering knuckle are integrally formed, and a shock absorber mounting groove is provided at the rear end of the main body.

[0007] As a preferred solution of the utility model, a second reinforcing rib is fixedly connected between the connecting arm and the top of the bushing, and a third reinforcing rib is fixedly connected between the two connecting arms and the main body.

[0008] As a preferred solution of the utility model, a water leakage hole is opened on the third reinforcing rib.

[0009] As a preferred solution of the utility model, a circle of first reinforcing ribs is fixedly connected between the outer periphery of the top of the shock absorber installation groove and the main body, and a notch is formed on the first reinforcing ribs.

[0010] As a preferred solution of the utility model, a weakening groove is provided at the connecting bend between the steering knuckle and the main body.

[0011] As a preferred solution of the utility model, the main body and the connecting arm are provided with interconnected inner cavities, a plurality of sets of fourth reinforcing ribs are fixedly connected in the inner cavities, interconnected bushing holes are opened between the bushing and the inner cavities, and the inner cavities and the bushing holes are smoothly connected.

[0012] As a preferred solution of the utility model, a plurality of windows and sand falling holes communicating with the inner cavity are provided at the bottom of the main body.

[0013] As a preferred solution of the utility model, the trailing arm body is made of ductile iron material QT700.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] (1) The utility model integrates the control arm and the steering knuckle with the main body, replaces the trailing arm in the traditional technology, eliminates the use of connecting parts, reduces the assembly process of the trailing arm suspension system of the rear wheel, greatly reduces the weight, conforms to the development trend of lightweight commercial vehicles, improves assembly efficiency, reduces production costs, and can also improve the quality stability of parts.

[0016] (2) The trailing arm body of the utility model is made of ductile iron material QT700, which has high strength and high elongation, can meet the overall rigidity and strength, reduce weight, and adopts the bionics lightweight design principle. By optimizing the structure of existing products, the product can be lightweight while meeting its use requirements and having better castability, which simplifies the casting process, thereby improving the casting productivity of the product, reducing the production cost of the product, reducing the waste of resources, achieving energy conservation and emission reduction, and reducing the cost of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the overall three-dimensional structure of the trailing arm structure of a passenger car Figure 1 ;

[0018] Figure 2 Schematic diagram of the overall three-dimensional structure of the trailing arm structure of a passenger car Figure 2 ;

[0019] Figure 3 It is a schematic diagram of the cross-sectional structure of the trailing arm structure of a passenger car;

[0020] Figure 4 This is a schematic diagram of the passenger car trailing arm structure in its installed and usable state.

[0021] In the figure: 1. trailing arm body; 11. main body; 111. window; 112. sand falling hole; 12. connecting arm; 13. bushing; 14. steering knuckle; 141. weakened groove; 15. shock absorber mounting groove; 151. first reinforcing rib; 152. notch; 16. second reinforcing rib; 17. third reinforcing rib; 171. water leakage hole; 18. inner cavity; 181. fourth reinforcing rib; 2. wheel; 3. shock absorber; 4. stabilizer bar. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0023] Example:

[0024] See also Figure 1-Figure 4 The present embodiment provides a trailing arm structure for a passenger vehicle, including a trailing arm body 1, the trailing arm body 1 including a main body 11, two control arms connected to one side of the main body 11, and a steering knuckle 14 fixedly connected to the front end of the main body 11, the steering knuckle 14 is used to connect and install with a wheel, the control arm is used to connect and install with a frame, a mounting hole is provided at the connection between the steering knuckle 14 and the main body 11, for installing a stabilizer bar 4, the control arm includes a connecting arm 12 fixedly connected to the main body 11 and a bushing 13 fixedly connected to an end of the connecting arm 12 away from the main body 11, the main body 11, the connecting arm 1 2. The bushing 13 and the steering knuckle 14 are integrally formed, and a shock absorber mounting groove 15 is opened at the rear end of the main body 11, and the shock absorber 3 is installed in the shock absorber mounting groove 15. The utility model integrates the control arm and the steering knuckle 14 with the main body 11, and integrates the control arm and the steering knuckle 14 with the main body 11, thereby replacing the trailing arm in the traditional technology, eliminating the use of connecting parts, reducing the assembly process of the trailing arm suspension system of the rear wheel, greatly reducing the weight, conforming to the development trend of lightweight commercial vehicles, improving assembly efficiency, reducing production costs, and also improving the quality stability of parts.

[0025] In this embodiment, the trailing arm body 1 is made of ductile iron material QT700, which has high strength and high elongation and can meet the overall stiffness and strength. The Abaqus CAE simulation software is used, combined with the stress conditions of each hard point, and the concept of bionic lightweight design is applied to optimize the topological structure of the trailing arm structure and remove redundant materials. On the premise of ensuring the strength of the product, the Magma casting simulation software is used to optimize the structure of the product, optimize the structure of places with thick walls that are prone to casting defects, reduce the wall thickness, and increase small local reinforcement ribs to meet the product's performance and process requirements, thereby achieving a lightweight design of the product.

[0026] In this embodiment, if Figure 1 As shown, a second reinforcing rib 16 is fixedly connected between the connecting arm 12 and the top of the bushing 13, a third reinforcing rib 17 is fixedly connected between the two connecting arms 12 and the main body 11, and a circle of first reinforcing ribs 151 is fixedly connected between the outer periphery of the top of the shock absorber mounting groove 15 and the main body 11. The second reinforcing rib 16 is provided to improve the connection stability between the connecting arm 12 and the bushing 13, the third reinforcing rib 17 is provided to improve the connection stability between the connecting arm 12 and the main body 11, and the first reinforcing rib 151 is provided to improve the structural strength of the shock absorber mounting groove 15, thereby improving the strength of the entire trailing arm.

[0027] In this embodiment, if Figure 1 As shown, a water leakage hole 171 is provided on the third reinforcing rib 17, and a notch 152 is provided on the first reinforcing rib 151. The water leakage hole 171 and the notch 152 can drain water quickly, thereby effectively avoiding the generation of water accumulation.

[0028] In this embodiment, if Figure 2 As shown, a weakened groove 141 is provided at the connection bend between the steering knuckle 14 and the main body 11 , and the structural strength of the connection between the steering knuckle 14 and the main body 11 is improved by the provision of the weakened groove 141 .

[0029] In this embodiment, if Figure 3 As shown, the main body 11 and the connecting arm 12 are provided with a communicating inner cavity 18, and a plurality of sets of fourth reinforcing ribs 181 are fixedly connected in the inner cavity 18. The inner cavity 18 is provided so that the interior of the trailing arm is hollow so that the cross-sectional area is significantly increased, thereby improving the strength of the trailing arm and effectively preventing the trailing arm from bending or breaking. Furthermore, the fourth reinforcing ribs 181 are provided in the inner cavity 18 to strengthen the overall force of the trailing arm.

[0030] In this embodiment, if Figure 2 and Figure 3As shown, a communicating bushing hole is opened between the bushing 13 and the inner cavity 18, and the inner cavity 18 is smoothly connected to the bushing hole, which is beneficial to the production and positioning of the sand core. A plurality of windows 111 and sand-dropping holes 112 communicating with the inner cavity 18 are opened at the bottom of the main body 11. Adding windows 111 to reduce weight at the weakly stressed part of the trailing arm also facilitates the positioning of the sand core. Adding sand-dropping holes 112 can clean the sand remaining in the inner cavity after shot peening, which is helpful for production and manufacturing, avoids casting defects, and improves the manufacturability and practicality of the parts.

[0031] To sum up, the present embodiment proposes to integrally form the control arm and the steering knuckle 14 with the main body 11, and to integrate the control arm and the steering knuckle 14 with the main body 11, thereby replacing the trailing arm in the traditional technology, eliminating the use of connecting parts, reducing the assembly process of the trailing arm suspension system of the rear wheel, and greatly reducing the weight, which is in line with the development trend of lightweight commercial vehicles, improves assembly efficiency, reduces production costs, and also improves the quality stability of parts. The trailing arm body 1 adopts ductile iron material QT700, which has high strength and high elongation, can meet the overall stiffness and strength, and reduce weight. By optimizing the structure of the existing product, the product can be lightweight while meeting its use requirements and has better castability, so that the casting process is simplified, thereby improving the casting productivity of the product, reducing the production cost of the product, reducing the waste of resources, achieving energy conservation and emission reduction, and reducing the cost of the product.

[0032] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the protection scope of the present invention.

Claims

1. A trailing arm structure for a passenger vehicle, comprising a trailing arm body (1), characterized in that: The trailing arm body (1) comprises a main body (11), two control arms connected to one side of the main body (11), and a steering knuckle (14) fixedly connected to the front end of the main body (11); the control arm comprises a connecting arm (12) fixedly connected to the main body (11) and a bushing (13) fixedly connected to one end of the connecting arm (12) away from the main body (11); the main body (11), the connecting arm (12), the bushing (13) and the steering knuckle (14) are integrally formed; and a shock absorber mounting groove (15) is provided at the rear end of the main body (11).

2. A passenger vehicle trailing arm structure according to claim 1, characterized in that: A second reinforcing rib (16) is fixedly connected between the connecting arm (12) and the top of the bushing (13), and a third reinforcing rib (17) is fixedly connected between the two connecting arms (12) and the main body (11).

3. A passenger vehicle trailing arm structure according to claim 2, characterized in that: The third reinforcing rib (17) is provided with a water leakage hole (171).

4. The trailing arm structure of a passenger vehicle according to claim 1, characterized in that: A circle of first reinforcing ribs (151) is fixedly connected between the outer periphery of the top of the shock absorber installation groove (15) and the main body (11), and a notch (152) is provided on the first reinforcing ribs (151).

5. The trailing arm structure of a passenger vehicle according to claim 1, characterized in that: A weakened groove (141) is provided at the connection bend between the steering knuckle (14) and the main body (11).

6. The trailing arm structure of a passenger vehicle according to claim 1, characterized in that: The main body (11) and the connecting arm (12) are provided with a communicating inner cavity (18), a plurality of groups of fourth reinforcing ribs (181) are fixedly connected in the inner cavity (18), a communicating bushing hole is provided between the bushing (13) and the inner cavity (18), and the inner cavity (18) and the bushing hole are smoothly connected.

7. A passenger vehicle trailing arm structure according to claim 6, characterized in that: The bottom of the main body (11) is provided with a plurality of windows (111) and sand falling holes (112) which are in communication with the inner cavity (18).

8. The trailing arm structure of a passenger vehicle according to claim 1, characterized in that: The trailing arm body (1) is made of ductile iron material QT700.

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