CN203793419U - Double-U-shaped rear subframe structure of passenger car - Google Patents

Abstract

A double U-shaped passenger car rear sub-frame structure, the front U-shaped beam and the rear U-shaped beam are fixedly connected by longitudinal beams and arranged in parallel, and the middle parts of the front U-shaped beam and the rear U-shaped beam are both concave U-shaped The two ends of the U-shaped part extend horizontally outward to form a straight extension part; effectively increase the space of the luggage compartment; the increase in the lateral spacing of the air springs effectively increases the roll stiffness of the vehicle body, which is conducive to the realization of the lightweight of the vehicle body; The U-shaped beam only has bending deformation, and the structural stress is small, which can appropriately reduce the section size, which is beneficial to the reduction of the weight of the whole vehicle.

Description

A rear sub-frame structure of a double U-shaped passenger car

technical field

The utility model relates to the field of passenger car auxiliary frame structures, in particular to a rear auxiliary frame structure of a double U-shaped passenger car. the

technical background

At present, the rear suspension of most passenger cars in domestic operation mostly adopts C-shaped beam structure. When the traditional C-shaped beam structure is applied to the passenger car structure, the longitudinal distance required is relatively large and takes up more space in the luggage compartment; the air on the left and right sides The spring spacing is small, which reduces the roll stiffness of the vehicle; the force of the C-shaped beam is relatively complicated. There are both bending stress and torsional stress in the various driving conditions of the bus, and the required cross-sectional size is large, which is not conducive to the realization of the lightweight of the vehicle. . Aiming at the deficiencies in the existing technology, a new double U-shaped passenger car rear subframe structure is proposed according to the structure of Chinese passenger cars. the

Utility model content

The utility model provides a rear sub-frame structure of a double U-shaped passenger car which is simple in force, light in weight and more suitable for the force characteristics of a load-bearing passenger car body. the

A double U-shaped passenger car rear sub-frame structure, the front U-shaped cross beam and the rear U-shaped cross beam are fixedly connected by longitudinal beams and arranged in parallel, the middle parts of the front U-shaped cross beam and the rear U-shaped cross beam are both U The two ends of the U-shaped portion extend horizontally outward to form a straight extension; the longitudinal beam includes a left longitudinal beam and a right longitudinal beam, and the front U-shaped crossbeam and the rear U-shaped crossbeam are respectively fixed on the left longitudinal beam and the right longitudinal beam. Front and rear ends of the right longitudinal beam. Or the left longitudinal beam and the right longitudinal beam are respectively fixed on the two ends of the bottom edge of the U-shaped part of the front U-shaped beam and the rear U-shaped beam. the

As a further preference, a local reinforcing plate is arranged in the middle of the longitudinal beam, and the local reinforcing plate is positioned at the upper surface and the lower surface of the longitudinal beam, and a local reinforcing block is set between the local reinforcing plates, and the local reinforcing plate and the local reinforcing plate are connected by bolts. Blocks are connected together. the

As a further preference, the cross-sectional shapes of the longitudinal beams, the front U-shaped beams and the rear U-shaped beams are square. the

As a further preference, an air spring is arranged outside the straight parts of the front U-shaped beam and the rear U-shaped beam, and a shock absorber is arranged inside the air spring. the

As a further preference, the underside of the local reinforcing plate is provided with a support for connecting the axle; the front U-shaped beam and the rear U-shaped beam are located at the front and rear of the axle respectively, and are arranged close to the tires. the

As a further preference, the air spring is arranged near the side wall of the passenger car body, and the center of the air spring is on the axis of the U-shaped beam. the

As a further preference, a circular arc transition is used between the straight portion and the U-shaped portion. the

As a further preference, the longitudinal beam is fixedly connected to the front U-shaped beam and the rear U-shaped beam by welding or riveting. the

As a further preference, the bottom sides of the U-shaped parts of the front U-shaped beam and the rear U-shaped beam are slightly higher than the highest point of the axle. the

As a further preference, the bolt is connected to the support connecting the axle. the

Compared with the existing C-beam structure, the double U-shaped sub-frame reduces the distance between the air springs in the longitudinal direction and effectively increases the luggage compartment space; The roll stiffness of the body is effectively increased, and the arrangement of the air spring close to the side wall is more suitable for the force characteristics of the load-bearing body, and is more conducive to the realization of the lightweight of the body; the height of the double U-shaped beam is slightly higher than that of the axle, and the body keel The front and rear penetration can still be realized without reducing the strength and rigidity of the whole vehicle; the existing C-shaped beam structure has both bending and torsional deformation in driving conditions, and the structural stress is relatively large, while the U-shaped beam in the utility model only has bending The deformation and structural stress are small, and the section size can be appropriately reduced, which is beneficial to the reduction of the weight of the whole vehicle. the

Description of drawings

Fig. 1 is a schematic diagram of a traditional C-beam structure in the prior art. the

Fig. 2 is a schematic structural diagram of the double U-shaped sub-frame described in the present invention. the

Fig. 3 is a side view of the structure of the double U-shaped auxiliary frame according to the present invention. the

Fig. 4 is a schematic diagram of the overall layout of the double U-shaped sub-frame structure described in the present invention. the

Fig. 5 is a schematic diagram of the connection structure between the longitudinal beam and the axle according to the utility model. the

Fig. 6 is a schematic diagram of main dimension parameters involved in the present invention. the

Fig. 7 is a schematic diagram of the double U-shaped sub-frame structure according to the present invention after the vehicle body frame is installed. the

Among them: 1. Left longitudinal beam, 2. Right longitudinal beam, 3. Front U-shaped beam, 4. Rear U-shaped beam, 5. Shock absorber, 6. Air spring, 7. Axle, 8. Tires, 9. V-shaped rod, 10, longitudinal thrust rod, 11, local reinforcement plate, 12, local reinforcement block. the

Detailed ways

Referring to Fig. 1, it is a traditional C-shaped beam structure in the prior art, air springs and shock absorbers are located at the extended end of the C-shaped beam, and the middle part of the C-shaped beam is fixed under the passenger car rear axle by bolts. This kind of C-shaped beam structure has many disadvantages, the required longitudinal distance of the bus chassis is large, and takes up more space in the luggage compartment; due to the limitation of the structure of the C-shaped beam, the arrangement of the spring and shock absorber is relatively close to the inner side, resulting in two The distance between the air springs on the side is small, which reduces the roll stiffness of the vehicle; the force of the C-shaped beam is more complicated. There are both bending stress and torsional stress in the various driving conditions of the bus, so the required cross-sectional size is relatively large, and the C-shaped beam is generally used. The structure with relatively large cross-section in the middle of the beam and relatively small cross-sections at both ends has complex structural shapes and is not conducive to achieving the goal of lightweighting the vehicle. the

Referring to accompanying drawings 2-5, the rear subframe structure of a double U-shaped passenger car includes a front U-shaped beam 3 and a rear U-shaped beam 4. The shape and structure of the front U-shaped beam 3 and the rear U-shaped beam 4 are the same, and the middle part is downward. The concave U-shape extends horizontally from the end of the U-shape to the outside, and a circular arc transition is adopted between the straight portion and the U-shape portion. As a preference, in order to strengthen the mechanical strength, the front U-shaped cross beam 3 and the rear U-shaped cross beam 4 can adopt steel materials with a cross-section. the

The front U-shaped beam 3 and the rear U-shaped beam 4 are fixedly connected by two longitudinal beams. The both sides of the U-shaped portion base of front U-shaped beam 3 and rear U-shaped beam 4 are respectively fixed on the front and back ends of left side beam and right side beam. As a preference, the two longitudinal beams are respectively connected to the two sides of the bottom edge of the U-shaped portion of the front U-shaped beam 3 and the rear U-shaped beam 4 . As a preferred method of connection, welding or riveting can be used. the

Air springs 6 and shock absorbers 5 are arranged at the ends of the outstretched straight parts of the front U-shaped beam 3 and the rear U-shaped beam 4, and 4 air springs and 4 shock absorbers are arranged in total. On the inner side of the air spring, a shock absorber base is set on the outstretched straight parts of the front U-shaped crossbeam 3 and the rear U-shaped crossbeam 4, and the lower end of the shock absorber is fixed on the shock absorber base. the

The stringer includes a left stringer 1 and a right stringer 2, and the middle part of the left stringer 1 and the right stringer 2 is provided with a local reinforcement plate 11, and the number of reinforcement plates 11 on each stringer is 2, which are respectively located on the stringer As a preference, the reinforcing plate 11 is approximately rhombus-shaped, and local reinforcing blocks 12 are arranged between the reinforcing plates 11, the number of which is 4, and the 4 bolts pass through the reinforcing plate 11 and the reinforcing block 12 respectively. , fixed on the support used to clamp the rear axle, and the bolts are arranged on the inner and outer sides of the longitudinal beam. the

The longitudinal beam is arranged above the axle 6 and connected by 4 bolts, and a local reinforcement plate 11 and a local reinforcement block 12 are designed at the bolt connection. The bolts are arranged on both sides of the longitudinal beam, which not only ensures the connection strength, but also maintains beam integrity. the

As a preference, the height of the front U-shaped beam 3 and the rear U-shaped beam 4 is slightly higher than that of the vehicle axle, and the vehicle body keel can still achieve front and rear penetration without reducing the strength and rigidity of the vehicle. the

The front U-shaped beam 3 and the rear U-shaped beam 4 are respectively arranged on the front and rear sides of the drive axle, and they are arranged as close to the tires as possible under the premise of avoiding the interference of the air springs, double U-shaped beams and tires, and the distance between the air springs is reduced longitudinally, effectively Increase luggage compartment space. the

Referring to Fig. 7, as a preference, the air spring 5 is arranged at a position close to the side wall of the bus body, the center of the air spring is on the axis of the U-shaped crossbeam, and its transverse spacing is increased, which effectively increases the roll stiffness of the vehicle body; shock absorption The devices 6 are respectively arranged at positions near the front or near the rear of the inside of the air spring. the

Refer to Figure 4, the overall schematic diagram of the passenger car rear axle and sub-frame. The two ends of the axle 7 are provided with double-row tires 8 respectively. One end of the V-shaped bar 9 is connected to the upper part of the axle 7 shell through a rubber pad, and the other end is connected to the vehicle body through a rubber pad to control the relative movement between the axle 7 and the vehicle body. motion track. Both sides of the vehicle axle 7 are also provided with longitudinal thrust rods 10 respectively, and the other ends of the longitudinal thrust rods 10 are connected to the vehicle body through rubber pads. The middle parts of the left and right longitudinal beams 1 and 2 of the double U-shaped passenger car rear sub-frame structure are fixedly connected to the axle 7 by bolts, forming a rectangular frame structure with a good force-bearing structure, and the cross-sectional shape is a square shape. The shape is simple, the manufacturing process is convenient, and it is beneficial to the light weight of the passenger car. the

The main size parameters used are shown in Figure 6, where: L ₁ is the lateral distance of the air spring, L ₂ is the longitudinal distance of the air spring, L ₃ is the vertical distance from the highest point of the axle housing to the axle axis, and L ₄ is the U-shaped The vertical distance from the upper plane of the middle part of the beam to the axis of the axle, D is the diameter of the tire.

Application example: Based on the tire outline size (D=1m), axle load and mass limit, referring to the existing passenger car rear suspension structure size parameters (as shown in Figure 7), in this technical solution, the U-shaped sub-frame mainly The size parameters are as follows (unit: meter): air spring lateral distance L ₁ =1.90, air spring longitudinal distance L ₂ =0.90, vertical distance from the highest point of the axle housing to the axle axis L ₃ =0.27, and the middle of the U-shaped beam The vertical distance L ₄ from the upper plane to the axle axis is 0.29, and the outermost width of the wheel is K=2.50.

The section size of the U-shaped beam is 100*100mm, the thickness is 7mm, the section size of the longitudinal beam is 80*90mm, and the thickness is 7mm; the thickness of the local reinforcement plate 11 is 7mm, the size of the local reinforcement block is 100*50mm, and the height is 80mm (unit: mm ). the

Preferably, the double U-shaped beams 3 and 4 are respectively arranged on the front and rear sides of the drive axle. The distance is not greater than the diameter of the tire (about 0.8-1m); four air springs 5 are arranged at both ends of the double U-shaped beams 3 and 4, and are connected to the side wall through the air springs. the

In the present utility model, in the case of not stating to the contrary, the used orientation words such as "upper, lower" and "vertical, horizontal" are usually defined in the normal use of the vehicle frame provided by the utility model, and It is also consistent with the directions shown with reference to the accompanying drawings; "inner and outer" refer to inner and outer relative to the outline of each component itself. the

The above description of the embodiments is for those of ordinary skill in the technical field to understand and apply the utility model. It is obvious that those skilled in the art can easily make various modifications to these embodiments, and apply the general principles described here to other embodiments without creative effort. Therefore, the utility model is not limited to the embodiments here, and the improvements and modifications made by those skilled in the art according to the disclosure of the utility model without departing from the scope of the utility model should be within the protection scope of the utility model. the

Claims (10)

1. a dual U-shaped passenger vehicle back-auxiliary cycle frame structure, it is characterized in that: between front U-girder and rear U-girder, be fixedly connected with and be arranged in parallel by longeron, the middle part of front U-girder and rear U-girder is all the U-shaped portion to lower recess, described U-shaped portion both ends horizontal extend to form laterally straight extension; Longeron comprises left longeron and right vertical beam, and described front U-girder and rear U-girder are separately fixed at the rear and front end of left longeron and right vertical beam.

2. dual U-shaped passenger vehicle back-auxiliary cycle frame structure according to claim 1, it is characterized in that: the middle part of described longeron arranges local reinforcing plate, described local reinforcing plate is positioned at upper surface and the lower surface of longeron, local boss is set between local reinforcing plate, by bolt, local reinforcing plate and local boss is linked together.

3. dual U-shaped passenger vehicle back-auxiliary cycle frame structure according to claim 1, is characterized in that: the cross sectional shape of described longeron and described front U-girder and rear U-girder is hollow.

4. dual U-shaped passenger vehicle back-auxiliary cycle frame structure according to claim 1 and 2, is characterized in that: the arranged outside air bellow of the flat part of front U-girder and rear U-girder, arranges bumper with respect to air bellow inner side.

5. dual U-shaped passenger vehicle back-auxiliary cycle frame structure according to claim 2, is characterized in that: the bearing that is provided for connecting vehicle bridge below described local reinforcing plate; Front U-girder and rear U-girder lay respectively at the front and back of vehicle bridge, and arrange near tire.

6. dual U-shaped passenger vehicle back-auxiliary cycle frame structure according to claim 1 and 2, is characterized in that: air bellow is arranged in the position near bus body gusset, and air bellow center is on the axis of described U-girder.

7. dual U-shaped passenger vehicle back-auxiliary cycle frame structure according to claim 1 and 2, is characterized in that: between described flat part and U-shaped portion, adopt arc transition.

8. dual U-shaped passenger vehicle back-auxiliary cycle frame structure according to claim 1, is characterized in that: described longeron is fixedly connected with described front U-girder and rear U-girder by welding or riveting.

9. according to the dual U-shaped passenger vehicle back-auxiliary cycle frame structure described in claim 1,2,3 or 5, it is characterized in that: the base of the U-shaped portion of described front U-girder and rear U-girder is a little more than the vertex of vehicle bridge.

10. dual U-shaped passenger vehicle back-auxiliary cycle frame structure according to claim 5, is characterized in that: described bolt connects the bearing of described connection vehicle bridge.