KR20050123463A - Rear suspension system of vehicle - Google Patents

Abstract

The present invention relates to a rear suspension of an automobile, wherein a torsion beam axle (2) welded to the trailing arm (1) at both ends while being disposed in the vehicle width direction is welded to the trailing arm (1) at the left and right sides, respectively. The left torsion beam axle 210 and the right torsion beam axle 230 are configured, and the ends of each axle 210 and 230 overlap each other in the state where the length adjustment is completed in the vehicle width direction of the bolt 251 and the nut 253. Coupled through clamping force; The torsion bar 3 which is installed inside the torsion beam axle 2 and connects between the trailing arms 1 is connected to the left side of the torsion bar 310 and the right side of the torsion bar 1, respectively. Consists of a bar 330, the end of each bar (310, 330) is formed so as to be spaced apart from each other with a plurality of ball bearings 350 therebetween are overlapped to allow the slide movement in the vehicle width direction, the torsion beam axle (2) And the length of the torsion bar (3) is variable to be able to maintain the wheel tread of the vehicle stably in accordance with the vehicle model, and also to be applied to various types of small vehicles in common.

Description

Rear suspension system of a vehicle

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear suspension device for a vehicle. In particular, the wheel tread can be changed by changing the length of the torsion beam axle and the torsion beam, and thus the vehicle rear can be commonly applied to various types of small vehicles. It is about a suspension device.

In general, a suspension device of a vehicle is a device that prevents damage to a vehicle body or a cargo and improves ride comfort by preventing vibration or shock received from a road surface directly while driving, among which a torsion beam axle The rear suspension of the small vehicle to which the) type is applied is shown in FIGS. 1 and 2.

That is, the left and right trailing arms 1 arranged along the longitudinal direction of the vehicle body, the torsion beam axles 2 arranged along the transverse direction of the vehicle body so as to connect between the right and left trailing arms 1, and A torsion bar (3) installed inside the torsion beam axle (2) and connecting the trailing arm (1), and a spring seat (4) and a spindle mounting bracket welded onto the trailing arm (1). (5) and the shock absorber mounting bracket (6), the coil spring (7) and the shock absorber (8) which are installed in the direction perpendicular to the spring seat (4) and the shock absorber mounting bracket (6), respectively, and connected to the vehicle body. And a trailing arm bush 9 coupled to the front end of the trailing arm 1 to couple the trailing arm 1 to the vehicle body side.

Here, the torsion beam axle (2) is a structure in which both ends are mounted by welding in a state arranged so as to overlap each other on the trailing arm (1), the torsion bar (3) is the both ends It is a structure that is mounted by welding in a state arranged to penetrate the trailing arm (1).

Therefore, the torsion beam axle 2 absorbs it through the torsional elastic force of the member when pitching occurs in the vehicle body while driving, and the torsion bar 3 serves to improve the roll rigidity when the vehicle is turning. Will be performed.

Meanwhile, in the conventional rear suspension device as described above, each part is joined by welding, and after welding, continuous heat deformation is performed by residual stress existing in each part, thereby making the wheel tread of the vehicle ( The problem is that the wheel tread is reduced.

As described above, when the wheel tread of the vehicle is changed to be smaller than the normal state, the overall durability of the suspension device is weakened and the driving stability of the vehicle is also deteriorated.

In addition, the conventional rear suspension is a structure that can not change the wheel tread when the assembly of the torsion beam axle (2) and the torsion bar (3) is completed, there is a problem that can not be commonly applied to various types of small vehicles Therefore, when the vehicle is changed, there is a problem in that a new rear suspension device must be developed for the wheel tread of the vehicle.

Accordingly, the present invention was devised to solve the above problems, and configured to vary the length of the torsion beam axle and the torsion bar, even if the wheel tread of the vehicle is reduced by heat deformation after welding of each component. It is an object of the present invention to provide a rear suspension of a vehicle that can improve the overall durability of the suspension and the running stability of the vehicle by making it adjustable in a normal state.

In addition, another object of the present invention, the wheel tread can be changed through the torsion beam axle and the torsion bar is variable in length, so that it can be commonly applied to various types of small vehicles to achieve a cost reduction It is in doing it.

The present invention for achieving the above object, the torsion beam axle which is arranged in the vehicle width direction and both ends are welded to the left and right trailing arms and the inside of the torsion beam axle is connected between the trailing arms In the rear suspension apparatus of a vehicle provided with a torsion bar, the torsion beam axle is composed of a left torsion beam axle and a right torsion beam axle, which are respectively welded to the left and right trailing arms, and the end of each axle has a length in the vehicle width direction. Overlapped with each other in a state where adjustment is completed, and are coupled through the fastening force of the bolt and the nut; The torsion bar is composed of a left torsion bar and a right torsion bar respectively connected to the trailing arms on the left and right sides, and the ends of each bar are formed to be spaced apart from each other with a plurality of ball bearings interposed therebetween so as to slide in the vehicle width direction. It is characterized by being coupled.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a plan view of a rear suspension device having a torsion beam axle and a torsion bar according to the present invention, which will be described with the same reference numerals to the same parts as the conventional structure.

As shown in FIG. 3, a rear suspension device of a small vehicle to which a torsion beam axle type is applied according to the present invention includes a trailing arm 1 on the left and right sides arranged along the longitudinal direction of the vehicle body. A torsion beam axle (2) disposed along the transverse direction of the vehicle body so as to connect between the left and right trailing arms (1), and installed inside the torsion beam axle (2) to connect the trailing arm (1). A torsion bar (3), a spring seat (4) and a spindle mounting bracket (5) and a shock absorber mounting bracket (6) welded onto the trailing arm (1), and the spring seat (4) Coil springs 7 (shown in FIG. 1) and shock absorbers 8 (shown in FIG. 1) and installed in the vertical direction on the absorber mounting bracket 6 and connected to the vehicle body, and the trailing arm 1 Coupled to the front end of the to engage the trailing arm (1) to the vehicle body side. It consists of a ring rail arm bush (9), and the like.

Here, the torsion beam axle (2) is a structure in which both ends are mounted by welding in a state arranged so as to overlap each other on the trailing arm (1), the torsion bar (3) is the both ends It is a structure that is mounted by welding in a state arranged to penetrate the trailing arm (1).

Meanwhile, the torsion beam axle 2 includes a left torsion beam axle 210 and a right torsion beam axle 230 welded to the left and right trailing arms 1 as shown in FIGS. 3 to 5, respectively. The ends of the left and right torsion beam axles 210 and 230 are overlapped with each other in a state in which the length adjustment is completed in the vehicle width direction and is coupled through the fastening force of the bolt 251 and the nut 253.

To this end, a bolt hole 211.231 through which the bolt 251 penetrates is formed at an overlapping portion of the left torsion beam axle 210 and the right torsion beam axle 230, and the bolt holes 211.231 are in the vehicle width direction. It is formed in the shape of a slit (slit) extending to.

The torsion beam axle 2 is composed of a left torsion beam axle 210 and a right torsion beam axle 230 welded to the left and right trailing arms 1 as shown in FIG. 6, respectively. Ends of the axles (210, 230) are overlapped with each other in the state of completing the length adjustment is coupled through the fastening force of the bolt 251 and the nut 253,

The torsion bar 3 is composed of a left torsion bar 310 and a right torsion bar 330 connected to trailing arms 1 on the left and right sides, respectively, and end portions of the left and right torsion bars 310 and 330 are multiple. It is formed so as to be spaced apart from each other with the two ball bearings 350 therebetween to be overlapped to allow the slide movement in the vehicle width direction.

Here, the left side and the right side of the torsion bar 310 and the right torsion bar 330 is in contact with the ball bearing 350 when the slide movement in the vehicle width direction, the inner side of the ball bearing (310, 330) Guide grooves 311 and 331 for guiding the rolling motion of the 350 are formed, respectively, and stopper protrusions 313 and 333 for limiting the rolling motion of the ball bearing 350 are formed at the ends of the left and right torsion bars 310 and 330.

In addition, a lubricant 370 is filled in the chamber 320 between the left and right torsion bars 310 and 330 in which the ball bearings 350 are installed, and O-rings at both ends of the left and right torsion bars 310 and 330. A torsion bar housing 390 with 391 is coupled to maintain airtightness.

Accordingly, in the rear suspension device according to the present invention, the left torsion bar 310 and the right torsion bar 330 are slid in the vehicle width direction by the rolling motion of the ball bearing 350, so that the overall torsion bar 3 has a length thereof. It can be smoothly changed.

In addition, if the left torsion beam axle 210 and the right torsion beam axle 230 also loosen the fastening force of the bolt 251 and the nut 253, the movement in the vehicle width direction is possible, and then the overall torsion beam axle 2 In the state in which the length of) is changed, the bolt 251 is tightened again to maintain the length of the variable length.

In this case, the length of the left and right torsion beam axles 210 and 230 may be changed by moving the bolt 251 through the bolt holes 211.231 formed in a slit shape.

As such, when the lengths of the left and right torsion beam axles 210 and 230 and the left and right torsion bars 310 and 330 are variable, the wheel tread of the vehicle can be easily changed, thereby constituting each rear suspension device. After welding of the parts, the wheel tread reduced by heat deformation can be restored to its normal state. As a result, the rear suspension system has improved overall durability and driving stability of the vehicle.

In addition, according to the present invention, if the wheel tread of the vehicle is easily changed, it can be commonly applied to various kinds of small vehicles, thereby reducing the development cost of the rear suspension when developing a new vehicle. do.

As described above, according to the present invention, the length of the torsion beam axle 2 and the torsion bar 3 can be varied, so that the wheel tread of the vehicle can be stably maintained according to the vehicle model, and thus the rear suspension The overall durability and running stability of the device is improved.

In addition, the present invention can be applied to various types of small vehicles in common, it is also possible to reduce the development cost of the rear suspension when developing a new vehicle.

1 is a perspective view for explaining a rear suspension of a typical small vehicle,

2 is a partial cross-sectional view taken along line II of FIG. 1;

3 is a plan view of a rear suspension device having a torsion beam axle and a torsion bar according to the present invention;

4 is a plan view for explaining the torsion beam axle of the rear suspension according to the present invention;

5 is a partial cross-sectional view taken along line II-II of FIG. 4;

6 is a cross-sectional view for explaining a torsion bar according to the present invention.

<Description of Symbols for Main Parts of Drawings>

1-trailing arm 2-torsion beam axle

3-Torsion Bar 210-Left Torsion Beam Axle

230-Right Torsion Beam Axle 251-Bolt

253-Nut 310-Left Torsion Bar

330-Right Torsion Bar 350-Ball Bearing

370-Lubricant 390-Torsion Bar Housing

Claims (4)

The torsion beam axle (2), which is disposed in the vehicle width direction and both ends are welded to the trailing arm (1) on the left and right sides, is installed inside the torsion beam axle (2) and connects the trailing arm (1). In the rear suspension of an automobile provided with a torsion bar (3), The torsion beam axle (2) comprises a left torsion beam axle (210) and a right torsion beam axle (230) welded to the left and right trailing arms (1), respectively. Overlapped with each other in a state in which length adjustment is completed, and are coupled through a fastening force between the bolt 251 and the nut 253; The torsion bar 3 is composed of a left torsion bar 310 and a right torsion bar 330 connected to trailing arms 1 on the left and right sides, respectively, and ends of the bars 310 and 330 are provided with a plurality of ball bearings 350. The rear suspension of the vehicle, characterized in that the overlap is formed so as to be spaced apart from each other so as to be spaced apart so that the slide movement in the vehicle width direction. The bolt hole 211.231 through which the bolt 251 penetrates is formed in an overlapping portion of the left torsion beam axle 210 and the right torsion beam axle 230, respectively, the bolt holes 211.231. The rear suspension of the vehicle, characterized in that formed in the shape of a slit extending in the vehicle width direction. According to claim 1, wherein the left torsion bar 310 and the right torsion bar 330 is the inner surface of the left and right torsion bar (310,330) making contact with the ball bearing 350 when the slide movement in the vehicle width direction Guide grooves 311 and 331 for guiding the rolling motion of the ball bearing 350 are formed, respectively, and the stopper protrusions 313 and 333 for limiting the rolling motion of the ball bearing 350 are formed at the ends of the left and right torsion bars 310 and 330. Rear suspension device for a vehicle, characterized in that formed. The chamber 320 between the left and right torsion bars 310 and 330 in which the ball bearings 350 are installed is filled with a lubricant 370, and the overlapping portions of the left and right torsion bars 310 and 330 are formed. A torsion bar housing (390) having an o-ring (391) at both ends thereof is coupled to maintain the airtightness.