JPS6129576Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a joint structure that connects a body frame disposed on both sides of the lower part of an automobile to a cross member that swingably supports a suspension arm.

This type of joint structure has already been proposed by the applicant of the present invention in Japanese Utility Model Publication No. 55-21899 shown in FIGS. 6 and 7.

In both of the above figures, a body frame 20 having a U-shaped cross section and disposed longitudinally on both sides of the lower part of the automobile;
The cross member 22 that swingably supports the suspension arm 21 is a bracket 2 in which the lower end of a bolt 23 is welded and fixed to the cross member 22.
4, ring-shaped rubbers 25 and 26 are interposed on the upper and lower sides of the bracket 24, and the bracket 24 is fastened and fixed with a nut 28 via a washer 27.

However, the pipe spacer 29 into which the bolt 23 is inserted and which is disposed between the upper and lower plates 20a and 20b of the vehicle body frame 20 is
0, but is welded and fixed to the vehicle body frame 20 via a reinforcement 30 having a semicircular cross-section along the outer periphery of the pipe spacer 29 (see FIG. 8). Therefore, there is a risk that the pipe spacer 29 may swing in the front, back, left and right directions.

Since the bolt 23 is inserted into the pipe spacer 29, which is arranged in such a manner that it can easily swing, the impact that is applied to the suspension arm 21 when the vehicle is running, when braking suddenly, when turning, etc. is transmitted to the bolt 23 via the cross member 22,
The bolt 23 is pulled in the front, back, left and right directions. Therefore, the bolt 23 moves together with the pipe spacer 29 in the above-mentioned tensile direction, and there is a problem in that the above-mentioned bonded state loosens over time and the bonding strength decreases.

This idea was developed in view of the above-mentioned conventional problems, and the pipe spacer into which the bolt is inserted is firmly fixed to the vehicle body frame to prevent the bolt from moving, thereby improving the joint strength against tensile loads. The purpose of this invention is to provide a joint structure between a vehicle body frame and a cross member.

Embodiments of this invention will be described below with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a vehicle body frame having a U-shaped cross section, which is disposed in the longitudinal direction on both sides of the lower part of the automobile (however, only one side is shown in the drawings). Reference numeral 2 designates a cross member, which is swingably supported by a suspension arm 3, and the vehicle body frame 1 and the cross member 2 are connected to each other by bolts 4.

3 and 4, 5 is a pipe spacer, 6 is a reinforcement, and 7 is a retainer.
It is arranged concentrically with the bolt insertion holes 8 and 9 drilled in the upper plate 1a and the lower plate 1b, and the inner diameter of the upper and lower ends is the same as that of the bolt insertion holes 8 and 9, and the lower part is located at an appropriate position. A plurality of protrusions 10 protruding inward are provided by netting processing from four sides,
Serrations 11 are carved at the positions of the bolts 4 that come into contact with these protrusions 10. Therefore, the bolt 4 cannot be easily rotated.

The reinforcement 6 has flange portions 6a and 6b formed on the upper and lower sides thereof welded and fixed to the upper plate 1a and lower plate 1b of the vehicle body frame 1, and a pipe spacer 5 is welded and fixed to the inner surface thereof.
As is clear from FIG. 5, a window portion 12 is cut out at the lower end portion corresponding to the pipe spacer 5.

As clearly shown in FIG. 4, the retainer 7 has both end edges welded and fixed to the inner surface of the reinforcement 6, and semicircular notches 7a and 7b are formed above and below the center as shown in FIG. A pipe spacer 5 is welded and fixed along the edge of the pipe.

Therefore, the pipe spacer 5 is clamped and fixed by a reinforcement 6 that is welded and fixed to the vehicle body frame 1 and a retainer 7 that is welded and fixed to this reinforcement 6.

The lower end of the pipe spacer 5 is placed on the upper surface of a washer 13 welded and fixed concentrically to the bolt insertion hole 9 on the lower plate 1b of the vehicle body frame 1,
And it is fixed to this washer 13 by welding.

A cross member 2 is fitted onto the tip of a bolt 4 that protrudes downward from the lower plate 1b of the vehicle body frame 1, and ring-shaped rubbers 14 and 15 are arranged above and below the cross member 2, and a nut 16 is attached to the cross member 2. It is tightened and fixed. 17 is a wheel apron, and the vehicle body frame 1 is attached to this wheel apron 17.
is fixed by welding.

The procedure for assembling the pipe spacer 5, reinforcement 6, retainer 7, and washer 13 to the vehicle body frame 1 will be described.

First, a washer 13 is placed on the lower plate 1b of the vehicle body frame 1 concentrically with the bolt insertion hole 9, and this washer 13 is welded and fixed to the upper surface of the lower plate 1b.

On the other hand, the pipe spacer 5 is welded and fixed to the inner surface of the reinforcement 6, and the retainer 7 is welded and fixed to the reinforcement 6 and the pipe spacer 5.

At this time, it is desirable that the upper surface of the upper flange 6a of the reinforcement and the upper end of the pipe spacer 7 be aligned and welded.

Next, the pipe spacer 5, the reinforcement 6, and the retainer 7, which are already integrally connected between the upper plate 1a and the lower plate 1b of the vehicle body frame 1 to which the washer 13 is welded and fixed, are connected. , the pipe spacer 5 is concentrically aligned with the bolt insertion holes 8 and 9, the flange portions 6a and 6b of the reinforcement 6 are welded and fixed to the upper plate 1a and the lower plate 1b of the vehicle body frame 1, and the rain The lower end of the pipe spacer 5 is welded to the washer 13 through the window 12 cut out in the forcement 6, and finally the bolt 4 is driven from above.

Although the lower end of the pipe spacer 5 may be directly welded to the lower plate 1b of the vehicle body frame 1, the distortion of the lower plate 1b that occurs during welding can be limited by interposing the washer 13 as in the above embodiment. Necessary surface accuracy can be ensured. Furthermore, the window portion 12 formed in the reinforcement 6 improves the adhesion of paint by electrodeposition.

In the above configuration, the pipe spacer 5 is sandwiched and fixed by welding between a reinforcement 6 which is welded and fixed to the vehicle body frame 1 and a retainer 7 which is welded and fixed to this reinforcement 6, and its lower end is connected to the vehicle body frame. Since the pipe spacer 5 is welded and fixed to the lower plate 1b of the pipe spacer 1, the pipe spacer 5 does not swing in the front-rear, left-right directions.

As explained above, in this invention, the pipe spacer is firmly fixed to the vehicle body frame, so the impact that acts on the suspension arm when the vehicle is running, when braking suddenly, when turning, etc., damages the cross member. Even if a tensile load is transmitted to the bolt through the bolt, the bolt does not move in the tensile direction, so the bonded state does not loosen over time and the bond strength does not decrease.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the joint between the vehicle body frame and the cross member, Fig. 2 is a sectional view taken along line A-A in Fig. 1, and Fig. 3 is an enlarged sectional view of the joint;
4 is a sectional view taken along line B-B in FIG. 3, FIG. 5 is a sectional view taken along line C-C in FIG. 3, FIG.
The figure is an enlarged sectional view of the same, and Figure 8 is D-- in Figure 7.
It is a sectional view along the D line. 1...Vehicle body frame, 1a...Top plate, 1b...
Lower plate, 2... Cross member, 3... Suspension arm, 4... Bolt, 5... Pipe spacer, 6... Reinforcement, 7... Retainer, 8, 9... Bolt insertion hole, 16... ...Natsuto.

Claims (1)

[Scope of utility model registration request] In a system in which a cross member that swingably supports a suspension arm is bolted to a body frame arranged longitudinally on both sides of the lower part of an automobile, the above-mentioned cross member is connected between the upper and lower plates having bolt insertion holes in the body frame having a U-shaped cross section. A pipe spacer arranged with its center aligned with the bolt insertion hole is clamped and fixed by a reinforcement fixed to the vehicle body frame and a retainer fixed opposite to the reinforcement, and the pipe The lower end of the spacer is fixed to the vehicle body frame, and a bolt is passed through the vehicle frame from an insertion hole in the upper plate of the vehicle body frame, and a cross member is attached to the bolt and tightened and fixed with a nut. The joint structure between the body frame and cross member of an automobile.