JPH0667112U - Suspension of wheels in a vehicle - Google Patents

Abstract

(57) [Abstract] [Purpose] The shape of the beam is devised so that the beam opening phenomenon can be eliminated without assembling a separate patch member. A beam 2 having a substantially C-shaped cross section is erected on the front end side of the trailing arm 1, and a reinforcing bracket is provided at a connecting portion between the trailing arm 1 and the beam 2 and at a rear corner portion of the beam 2. 3, and the reinforcing bracket 3 and the beam 2 provide a closed space S,
In a suspension system for a wheel in a vehicle, in which a receiving portion 8 that receives a lower end of a spring 5 is provided between the beam 2 in the trailing arm 1 and the wheel 70, a mounting portion of the reinforcing bracket 3 in the beam 2 is provided. The rear curved wall 23 is displaced forward to form a vertical wall 9 extending vertically, and the closed space S having an enlarged cross-sectional area is formed between the vertical wall 9 and the reinforcing bracket 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a trailing arm type suspension device.

[0002]

[Prior art]

 Generally, this type of suspension system is constructed by connecting a pair of trailing arms pivotally supported on both left and right sides of a vehicle body with a beam as shown in, for example, Japanese Patent Laid-Open No. 58-53504. A wheel is supported at the rear end of the vehicle, and a spring is interposed between the trailing arm and the vehicle body.

[0003]

[Problems to be solved by the device]

 By the way, in the above-mentioned suspension device, as schematically shown in FIG. 5, the beam A has a substantially C-shaped cross section with an opening at the front, and a pair of upper and lower welding pieces (not shown) projecting from both ends of the beam A. No.) is fixed to the trailing arm B, while the trailing arm B is provided with a catching portion E for catching the lower end of the spring D between the beam A and the wheel C, the trailing arm B A push-up force P1 from the road surface acts on the wheel support portion at the end through the wheel C, while the receiving portion E has a spring D acting in a direction opposite to the push-up force P1. The trailing arm B of the beam A coupled to the trailing arm B is bent by the spring reaction force P2 of the trailing arm B as shown by the chain line L in FIG. As shown by arrows X1 and X2 in FIG. 5, there is a problem that the stress is concentrated at the connecting portion of the beam A and the trailing arm B, that is, the fixing portion of the welding piece, by changing the shape so as to open the mouth. .

For such a problem, a separately formed patch may be fixed to the front opening of the beam A so as to prevent the opening of the beam A. This increases the number of points and the labor required for assembly, resulting in an increase in cost.

The present invention was developed in view of the above circumstances, and an object thereof is to devise the shape of the beam so that the opening of the beam can be opened without assembling a separate patch member. It is an object of the present invention to provide a suspension device for a wheel that can solve the phenomenon.

[0006]

[Means for Solving the Problems]

 Thus, the present invention supports the wheels 70 on the rear ends of the trailing arms 1 pivotally supported on the left and right sides of the vehicle body 4, and the front ends of the trailing arms 1 are open to the front and curved to the rear. A beam 2 having a wall 23 and having a substantially C-shaped cross section is installed, and a reinforcing bracket 3 is provided at a connecting portion between the trailing arm 1 and the beam 2 and at a rear corner portion of the beam 2. The reinforcing bracket 3 and the beam 2 provide a closed space S, while the trailing arm 1 is interposed between the beam 2 and the wheel 70 and is interposed between the trailing arm 1 and the vehicle body 4. In a suspension system for a wheel of a vehicle provided with a receiving portion 8 for receiving the lower end of the spring 5, the rear curved wall 23 of the beam 2 where the reinforcing bracket 3 is attached is displaced forward. The vertical wall 9 is formed extending vertically Te, between the reinforcing bracket 3 and the vertical wall 9, it is characterized in that the formation of the closed space S of the enlarged cross-sectional area.

[0007]

[Action]

 According to the present invention, the closed space S formed at the joint between the longitudinal ends of the beam 2 and the trailing arm 1 and at the rear corner portion of the beam 2 is enlarged and the corner is enlarged. Since the rigidity of the part is sufficiently high, even if the trailing arm 1 is bent, the front opening of the beam 2 does not open its mouth.

[0008]

【Example】

 The suspension system shown in the figure basically comprises a trailing arm 1 pivotally supported on both left and right sides of a vehicle body, and a beam 2 which is installed on the front end side of these trailing arms 1 and which joins both trailing arms 1. , A reinforcing bracket 3 for connecting the trailing arm 1 and the beam 2 at a joint between the trailing arm 1 and the beam 2 and at a rear corner portion of the beam 2, the trailing arm 1 and the vehicle body 4 And a coil-shaped spring 5 interposed between and.

The trailing arm 1 shown in the figure has a hollow cross-section structure in which an upper sheet metal member 1 a and a lower sheet metal member 1 b, which are press-molded into a substantially bowl shape, are joined by welding. A cylinder 6 is fixed to the front end of the trailing arm 1, and the cylinder 6 is pivotally supported on the vehicle body 4 via a rubber bush 61, so that the rear end side of the trailing arm 1 can freely swing upward and downward. A wheel spindle 7 that rotatably supports a rear wheel 70 is fixed to the rear end of the trailing arm 1.

Further, at the intermediate portion in the lengthwise direction of the upper sheet metal member 1a constituting the trailing arm 1, in other words, at the inner edge between the mounting portion of the wheel spindle 7 and the beam coupling portion described later, While a dish-shaped receiving portion 8 for receiving the lower end of the spring 5 is integrally formed, a support bracket 10 for supporting the lower end of a shock absorber (not shown) is attached below the rear end of the trailing arm 1. There is.

The beam 2 is formed to have a substantially C-shaped cross section including an upper wall 21 and a lower wall 22 facing each other, and a curved wall 23 connecting the rear ends of the upper wall 21 and the lower wall 22. A pair of upper and lower welding pieces 24 are projectingly provided on both ends of the upper wall (21) and the lower wall 22 in the beam 2 in the longitudinal direction, and the welding pieces 24 are provided on the front end side of the trailing arm 1 and on the cylinder. The beam 2 is bridged between the left and right trailing arms 1 by welding at a position rearward of the beam 6.

Further, the reinforcing bracket 3 shown in the figure is composed of an upper bracket piece 3a and a lower bracket piece integrally formed on the inner edge of the middle portion in the longitudinal direction of the upper and lower sheet metal members 1a and 1b constituting the trailing arm 1. 3b, the inner edge portions of these upper and lower bracket pieces 3a and 3b are joined by welding, and the front end portions are fixed to the upper wall 21 and the lower wall 22 of the beam 2 by welding, whereby the trailing arm A closed space S defined by the reinforcing bracket 3 and the beam 2 is provided at the joint between the beam 1 and the beam 2 and at the rear corner of the beam 2. The rear curved walls 23 of both ends of the beam 2 are displaced forward by drawing to provide vertical walls 9 extending in the vertical direction at both ends of the beam 2. The cross-sectional area of the closed space S defined by the strong bracket 3 is enlarged, and a coupling piece 91 is integrally formed at the end of the vertical wall 9, and the coupling piece 91 is formed on the inner surface of the trailing arm 1. It is joined by welding.

Thus, according to the suspension device configured as described above, the closure formed at the connecting portion between the lengthwise both ends of the beam 2 and the trailing arm 1 and at the rear corner portion of the beam 2. Since the space S is enlarged by the vertical wall 9 provided in the beam 2 and the rigidity of the corner portion is sufficiently high, as described above, even if the trailing arm is shown by the one-dot chain line in FIG. Even if the beam 2 is bent, the upper wall 21 and the lower wall 22 of the beam 2 are not deformed in the direction away from each other, and the opening of the beam 2 does not open its mouth. It is possible to prevent stress from concentrating at the joint with the arm 1.

In the above embodiments, the reinforcing bracket 3 and the receiving portion 8 of the spring 5 are integrally formed with the trailing arm 1, but they may be formed separately.

[0015]

[Effect of device]

 As described above, according to the present invention, the trailing arm 1 is provided with the beam 2 having a substantially C-shaped cross-section, which is open at the front end and has the curved wall 23 at the rear, and the trailing arm 1 and the beam 2 are provided. A reinforcing bracket 3 is provided at the joint between the beam 2 and the rear corner portion of the beam 2, and a closed space S is provided between the reinforcing bracket 3 and the beam 2, while the beam 2 and the wheel in the trailing arm 1 are provided. A wheel suspension system for a vehicle, in which a receiving portion 8 for receiving a lower end of a spring 5 interposed between the trailing arm 1 and the vehicle body 4 is provided between the reinforcing bracket 3 and the beam 2. The rear curved wall 23 of the mounting portion is displaced forward to form a vertical wall 9 extending in the vertical direction, and the vertical wall 9 and the reinforcing bracket 3 are expanded between the vertical wall 9 and the reinforcing bracket 3. By forming the closed space S having the cross-sectional area described above, it is possible to connect the trailing arms 1 to both ends in the longitudinal direction of the beam 2 and the rear side of the beam 2 without separately providing a reinforcing member. Since the closed space S formed in the corner portion is enlarged and the rigidity of the corner portion is sufficiently increased, even if the trailing arm 1 is bent, the front opening of the beam 2 does not open its mouth. Therefore, it is possible to prevent the stress from concentrating on the joint between the beam 2 and the trailing arm 1.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a main part of a suspension device.

FIG. 2 is an enlarged cross-sectional view of a main part of the suspension device.

FIG. 3 is a schematic perspective view of a main part of the suspension device viewed from another angle.

FIG. 4 is a plan view of a main part of a beam.

FIG. 5 is a sectional view of a main part of a conventional suspension device.

[Explanation of symbols]

 1 Trailing Arm 2 Beam 23 Curved Wall 3 Reinforcing Bracket 4 Car Body 5 Spring 70 Rear Wheel (Wheel) 8 Receiving Section 9 Vertical Wall S Closed Space

Claims (1)

[Scope of utility model registration request] 1. A wheel (70) is supported at a rear end of a trailing arm (1) pivotally supported on both left and right sides of a vehicle body (4), and a front end of the trailing arm (1) is provided at a front side. A beam (2) having a substantially C-shaped cross-section with a curved wall (23) opened at the rear, and at the joint between the trailing arm (1) and the beam (2) (2) A reinforcing bracket (3) is provided at a rear corner portion of the trailing arm (1), and a closed space (S) is provided between the reinforcing bracket (3) and the beam (2). A vehicle provided with a receiving portion (8) for receiving the lower end of a spring (5) interposed between the trailing arm (1) and the vehicle body (4) between the wheel (2) and the wheel (70). In the suspension of the wheels in The rear curved wall (23) of the mounting portion of the reinforcing bracket (3) in 2) is displaced forward to form a vertical wall (9) extending in the vertical direction, and the vertical wall (9) and the reinforcing bracket (3). ) With the closed space (S) having an enlarged cross-sectional area, the suspension system for a wheel in a vehicle.