KR100953318B1 - Car trailing arm mounting units - Google Patents

Abstract

When the trailing arm is mounted to the body frame, the trailing arm is mounted by minimizing the assembly tolerance between the fastening bolt and the nut through a guide plate mounted on the body frame and a nut seating groove formed in the inner pipe. Accurately mounted on the frame, improving workability and reducing installation costs

A nut seating groove is formed on an inner circumferential surface of the front end portion of the inner pipe corresponding to the outside of the body frame, and a nut fixing groove is formed on the body frame corresponding to the mounting position of the trailing arm. The guide plate in which the hole is formed is welded to the outside of the body frame corresponding to the nut fixing groove, a fastening bolt is inserted into the inner pipe at the other end of the inner pipe, and the nut is seated in the nut seating groove. And the nut is inserted into the nut fixing groove by the fastening bolt inserted, and the insulator wraps around the outer circumferential surface of the inner pipe in which the nut seating groove is formed, and has an inner diameter smaller than the inner diameter of the nut seating groove. It provides a trailing arm mounting unit for a vehicle, characterized in that the locking end is formed.

Trailing arm, bush, guide plate, fixed end, mounting unit

Description

TRAILING ARM MOUNTING UNIT FOR VEHICLE}

The present invention relates to a trailing arm mounting unit for a vehicle, and more particularly, when the trailing arm is mounted on a vehicle frame, the trailing arm mounting for a vehicle to minimize the assembly tolerances to accurately mount the trailing arm on the body frame. It's about the unit.

In general, the suspension device of the vehicle connects the axle and the vehicle body, so that vibrations or shocks received from the road surface are not directly transmitted to the vehicle body while driving the vehicle, thereby improving the riding comfort.

Such suspension systems are largely classified into an integrated axle suspension system and an independent suspension system according to the type of axle. In general, an independent suspension system is used for a passenger car that emphasizes riding comfort or maneuverability.

Among the independent suspensions, the rear suspension of the coupled torsion beam axle (CTBA) type is called 'CTBA'. Due to its relatively high running stability compared to the small weight, it has been mainly applied as a rear suspension of light and semi-medium cars.

As illustrated in FIG. 1, the CTBA type rear wheel suspension device includes a torsion beam 101 in the vehicle width direction, and a carrier 103 for mounting tires and wheels at both ends of the torsion beam 101. ), The trailing arm 105 having one side fixed thereto.

Bushings 109 and shock absorbers 107 for connecting to the body frame 200 are respectively formed at the front and rear ends of each trailing arm 105, and a spring seat 111 is formed at one rear side thereof. The spring 113 is installed between the vehicle body.

Here, the bush 109 is integrally fixed to the outer pipe 115 at the front end of the trailing arm 105, the inner pipe 117 is disposed inside the outer pipe 115, the outer pipe An insulator 119 is interposed between the 115 and the inner pipe 117 in a bonded state.

The rear wheel suspension of the CTBA type having such a configuration is mounted to the vehicle body frame 200 through a mounting unit 120, as shown in FIG.

The mounting unit 120 includes a nut housing 123 welded with the nut 121 inserted into the body frame 200 in correspondence to the position where the trailing arm 105 is mounted, and the trail. It consists of a mounting bolt 125 through which the lower end is fastened to the nut 121 inserted into the nut housing 123 through the inner pipe 117 of the bush 109 mounted on the ring arm 105 The trailing arm 105 is mounted on the body frame 200.

However, in the conventional trailing arm mounting unit as described above, when the nut housing is welded to the inside of the vehicle body frame, tolerances are generated by welding scattering between parts, and thus the trailing arm cannot be positioned at the mounting position of the trailing arm. The mounting workability of the deterioration, there is a problem that the installation cost increases as the nut housing is further welded.

In addition, as the nut inserted into the nut housing flows inside the nut housing, an assembly tolerance between the fastening bolt and the nut is generated, which also makes it difficult to accurately fasten the fastening bolt to the nut. have.

Therefore, the present invention has been invented to solve the above problems, an object of the present invention is to provide a nut seating groove formed in the guide plate and the inner pipe mounted on the vehicle body frame when the trailing arm is mounted on the vehicle body frame. By performing the mounting work by minimizing the assembly tolerance of the fastening bolt and nut through it, to provide a trailing arm mounting unit for a vehicle to accurately mount the trailing arm on the body frame, improve workability and reduce installation costs will be.

A vehicle trailing arm mounting unit according to an embodiment of the present invention for achieving the above object is equipped with a bush having an insulator interposed between the outer pipe and the inner pipe at the tip of the trailing arm, the trail through the bush A trailing arm mounting unit for a vehicle for attaching a ring arm to a vehicle body frame, the nut seating groove being formed on an inner circumferential surface of the distal end of the inner pipe corresponding to the outside of the vehicle body frame, and corresponding to the mounting position of the trailing arm. To form a nut fixing groove on the vehicle body frame, a guide plate having an insertion hole formed at the center of the cross section corresponding to the nut fixing groove, and welded to the outside of the vehicle body frame, and a fastening bolt at the other end of the inner pipe. Inserted into the inner pipe, the nut seated in the nut seating groove In the state, the fastening bolt is inserted into the nut fixing groove and fastened by the inserted bolt, and the insulator surrounds the outer peripheral surface of the tip of the inner pipe in which the nut seating groove is formed. The engaging end can be formed.

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The guide plate may have a plurality of fixed ends protruding from each other at a predetermined angle along the inner circumferential surface of the insertion hole.

Each fixing end may be bent toward the inside of the nut fixing groove.

According to the trailing arm mounting unit for a vehicle according to the present invention as described above, when the trailing arm is mounted on the body frame, the fastening bolt and the nut of the fastening bolt through the nut seating groove formed in the guide plate and the inner pipe mounted to the body frame By performing the mounting operation to minimize the assembly tolerance, it is possible to accurately mount the trailing arm on the vehicle body frame, thereby improving the mounting workability.

In addition, in the case of forming the vehicle body frame instead of the nut housing that is conventionally used for mounting the trailing arm, as the nut fixing groove is formed, there is an effect of reducing the overall installation cost by reducing the number of parts.

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

Prior to this, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, which can be replaced at the time of the present application It should be understood that there may be various equivalents and variations.

3 is a cross-sectional view of a trailing arm mounting unit for a vehicle according to an embodiment of the present invention, and FIG. 4 is a perspective view of a portion A of FIG. 3, and a guide plate applied to the trailing arm mounting unit for a vehicle according to an embodiment of the present invention. Perspective view.

Referring to the drawings, a trailing arm mounting unit for a vehicle according to an exemplary embodiment of the present invention is a guide plate 23 mounted to the vehicle body frame 1 when the trailing arm 3 is mounted to the vehicle body frame 1. Through the nut mounting groove 17 formed in the inner pipe 13 to minimize the assembly tolerance of the fastening bolt 29 and the nut 31 to perform the mounting operation, the trailing arm (3) to the body frame ( 1) Accurately install on the top, improve workability and reduce installation cost.

To this end, the trailing arm mounting unit for a vehicle according to an embodiment of the present invention, as shown in Figure 3, through the bushing 10 mounted to the tip of the trailing arm 3, the trailing arm (3) ) Is mounted on the vehicle body frame (1).

First, the bush 10 includes an outer pipe 11 forming an outer cylinder, an inner pipe 13 forming an inner cylinder, and an insulator 15 interposed between the outer pipe 11 and the inner pipe 13. It consists of.

In the present embodiment, the nut seating groove 17 is formed in the inner pipe 13 on the inner circumferential surface of the tip portion corresponding to the outside of the vehicle body frame 1.

Here, the insulator 15 surrounds the outer peripheral surface of the tip of the inner pipe 13 in which the nut seating groove 17 is formed, and the end of the insulator 15 has an inner diameter smaller than the inner diameter of the nut seating groove 17. (19) is formed.

A nut fixing groove 21 is formed on the body frame 1 in correspondence with the mounting position of the trailing arm 3.

In response to the nut fixing groove 21, the guide plate 23 is welded to the outside of the vehicle body frame 1.

The guide plate 23 has an insertion hole 25 formed at the center of the cross section, and the insertion hole 25 has a rectangular shape.

Here, the guide plate 23 is a fixed end 27 is formed at an angle of 90 degrees along the inner circumferential surface of the insertion hole 25, the fixed end 27 is a square shape of the insertion hole 25 angle Protruding from the center of the inner surface, respectively.

Each of the fixing end 27 is bent at an angle toward the inside of the nut fixing groove 21.

The fastening bolt 29 is inserted into the inner pipe 13 of the bush 10.

The fastening bolt 29 is inserted through the inner pipe 13 at the other end of the inner pipe 13 opposite to the nut seating groove 17, and the nut seated on the nut seating groove 17. After inserting the 31 into the nut fixing groove 21, the nut 31 is fastened to the nut 31 to fix the trailing arm 3 to the vehicle body frame 1.

Here, the locking end 19 is to prevent the nut 31 inserted into the nut seating groove 17 from being separated from the nut seating groove 17 before the fastening bolt 29 is inserted. When the nut 31 is inserted or removed, it is freely deformed.

When the nut 31 is inserted into the nut fixing groove 21 by the fastening bolt 29, the fixing ends 27 are separated from the nut 31 and inside the nut fixing groove 21. It is to prevent the flow.

Each of the fixing end 27 has its own elastic force, and when the nut 31 is inserted, it is bent toward the inner circumferential surface of the nut seating groove 21, and after the insertion of the nut 31 is completed, again It is restored to its original position by its elastic force so that each end supports one surface of the nut 31.

That is, the nut 31 inserted into the nut fixing groove 21 by the fastening bolt 29 maintains the position when the nut 31 is inserted by the fixing ends 27 as it is by the operator. When tightening with (29), the assembly tolerance is reduced and the tightening operation becomes easy.

Hereinafter, the mounting method and operation of the trailing arm mounting unit for a vehicle according to an embodiment of the present invention configured as described above will be described in detail.

5 is a step-by-step mounting state diagram of a trailing arm to which the trailing arm mounting unit for a vehicle according to the embodiment of the present invention is applied.

First, as shown in (S1) of FIG. 5, the worker attaches the nut to the knuff seating groove 17 processed on the inner pipe 13 of the bush 10 mounted at the tip of the trailing arm 3. (31) is inserted.

At this time, the locking end 19 of the insulator 15 is deformed into a folded state toward the inside of the nut seating groove 17 when the nut 31 is inserted, as shown in (S2) of FIG. When the insertion of the nut 31 is completed, as shown in (S3) of Figure 5, it is restored to the initial state again to prevent the nut 31 is separated from the nut seating groove (17).

Then, the worker, as shown in (S4) of Figure 5, the fastening bolt 29 is inserted into the inner pipe 13, the fastening bolt 29 is inserted into the inner pipe 13 is, Figure 5 As shown in (S5), the front end of the nut 31 is separated from the nut seating groove 17.

At this time, the locking end 19 is deformed as opposed to when the nut 31 is inserted so that the nut 31 is easily separated.

When the worker continues to insert the fastening bolt 29, as shown in (S6) of Figure 5, the nut 31 is inserted into the nut fixing groove 21, at this time, the guide plate 23 Each fixed end 27 of the nut is bent toward the inside of the fixing groove 21.

Then, when the nut 31 is completely inserted into the nut fixing groove 21, each of the fixing end 27 is restored to its initial position by its elastic force so that each end is one surface of the nut 31 The nut 31 is fixed by supporting it.

When the step is completed, the operator rotates the fastening bolt 29 to be fastened to the nut 31, and when the fastening of the nut 31 and the fastening bolt 29 is completed, the trailing arm (3) ) Is completed on the vehicle body frame (1).

Accordingly, when the trailing arm mounting unit for a vehicle according to the embodiment of the present invention configured as described above is applied, the guide plate is mounted on the body frame 1 when the trailing arm 3 is mounted to the body frame 1. Through the nut seating groove 17 formed in the 23 and the inner pipe 13 to minimize the assembly tolerance of the fastening bolt 29 and the nut 31 to perform the mounting operation, thereby the trailing arm (3) It can be correctly mounted on the vehicle body frame 1, thereby improving the mounting workability.

In addition, in the case of forming the vehicle body frame 1 in place of the nut housing that is conventionally used for mounting the trailing arm, the nut fixing groove 21 is formed to reduce the number of parts, thereby reducing the overall installation cost. do.

As mentioned above, although this invention was demonstrated by the limited embodiment and drawing, this invention is not limited by this and is given by the person of ordinary skill in the art to the following, Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

1 is a perspective view of a typical coupled torsion beam axle (CTBA) suspension.

2 is a cross-sectional view of a vehicular trailing arm mounting unit according to the prior art.

3 is a cross-sectional view of a trailing arm mounting unit for a vehicle according to an embodiment of the present invention.

FIG. 4 is a perspective view of portion A of FIG. 3, and is a perspective view of a guide plate applied to a trailing arm mounting unit for a vehicle according to an exemplary embodiment of the present disclosure.

5 is a step-by-step mounting state diagram of a trailing arm to which the trailing arm mounting unit for a vehicle according to the embodiment of the present invention is applied.

Claims (4)

In the tip of the trailing arm is provided with a bush is formed between the outer pipe and the insulator interposed between the outer pipe, the vehicle trailing arm mounting unit for mounting the trailing arm to the body frame through the bush, A nut seating groove is formed on an inner circumferential surface of the front end portion of the inner pipe corresponding to the outside of the body frame, and a nut fixing groove is formed on the body frame corresponding to the mounting position of the trailing arm. The guide plate in which the hole is formed is welded to the outside of the body frame corresponding to the nut fixing groove, a fastening bolt is inserted into the inner pipe at the other end of the inner pipe, and the nut is seated in the nut seating groove. By inserting the fastening bolt inserted into the nut fixing groove, The insulator wraps around the outer circumferential surface of the inner end of the inner pipe in which the nut seating groove is formed, and the trailing arm mounting unit for the vehicle, characterized in that a locking end having an inner diameter smaller than the inner diameter of the nut seating groove is formed. delete The method of claim 1, The guide plate is a trailing arm mounting unit for a vehicle, characterized in that a plurality of fixed ends are formed to protrude at a predetermined angle along the inner circumferential surface of the insertion hole. The method of claim 3, Each of the fixing end is bent toward the inside of the nut fixing groove for the trailing arm mounting unit for a vehicle.

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