JP2000301924A - Axle suspension - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent displacement of axle position when a vehicle collides by interposing a U-bolt shifting regulating member having a taper surface inclined toward the rear between the uppermost surface of the lowermost surface of a leaf spring and a plurality of U-bolts. SOLUTION: In rear and front axle suspension, a U-bolt shifting regulating member 6 is interposed between the uppermost surface of a leaf spring 2 and U-bolts 4. The U-bolt shifting regulating member 6 is a wedge-like member having a taper surface inclined toward the rear (ii) in the longitudinal direction (i)-(ii) of a vehicle. When the front of the vehicle collides, an axle 3 is about to displace toward an up-grade of the U-bolt shifting regulating member 6 due to inertia, but the forward displacement, that is, shifting of the U-bolt is regulated by the up-grade of the U-bolt shifting regulating member 6. Thus, the forward displacement of the axle 3 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an axle suspension for a vehicle.

[0002]

2. Description of the Related Art In order to prevent various impacts received from a road surface from being transmitted directly to a chassis frame, an axle suspension uses an U-bolt to fix an axle to a leaf spring attached to the chassis frame via a bracket with a plurality of U-bolts. The leaf spring absorbs and reduces the impact.

[0003]

In the above-mentioned conventional axle suspension, a bolt is penetrated through a center portion of a plurality of leaf springs in the longitudinal direction, the axle is positioned at the tip of the bolt, and the leaf spring is used. The axle is tightened and fixed by the tightening axial force of the U-bolt to be held. However, if an excessive longitudinal force is generated due to a frontal collision of the vehicle, the U-bolt is displaced with respect to the leaf spring due to inertia, and the position of the axle is reduced. May be displaced forward to cause inconvenience to the vehicle structure.

[0004] It is an object of the present invention to provide an axle suspension that prevents displacement of an axle position at the time of a vehicle collision or the like.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the gist of the present invention is to provide an axle suspension in which an axle is fixedly fastened to a leaf spring attached to a chassis frame by a plurality of U-bolts. A U-bolt displacement restricting member is interposed between the uppermost surface or the lowermost surface and the plurality of U-bolts.

The U-bolt displacement restricting member is a wedge-shaped member having a tapered surface inclined rearward in the front-rear direction of the vehicle.

In an axle suspension in which an axle is fastened and fixed to a leaf spring attached to a chassis frame with a plurality of U-bolts, a bolt displacement regulating member having an engaging portion that engages with the U-bolt is weighted by the leaf spring. It is characterized by being interposed in between.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a chassis frame, and 2 is a leaf spring attached to the chassis frame. Generally, the leaf spring 2 has a front end directly attached to the bracket 9a and a rear end attached to the bracket 9b via a shackle 10. In addition to the shackle type, there is a sliding type.

A plurality of leaf springs 2 are stacked,
A bolt 11 penetrates through the center in the longitudinal direction, and the tip of the bolt 11 positions the axle 3 on the leaf spring 2. A spring seat upper 5 having a bolt retaining recess 5a on the uppermost surface of the leaf spring 2.
A plurality (2 in the figure) holding the leaf spring 2 via the spring seat upper 5.
The axle 3 is tightened and fixed by the tightening axial force of the U bolt 4 of the present invention.

The axle suspension shown in FIG. 1 is a rear axle suspension, and the axle suspension shown in FIG. 2 is a front axle suspension.
Is provided. Note that a shock absorber is also provided on the rear axle suspension side.

The present invention is characterized in that in the rear and front axle suspensions described above, a U-bolt displacement restricting member 6 is interposed between the uppermost surface of the leaf spring 2 and the plurality of U-bolts 4. Things.

As shown in FIGS. 3 and 4, the U-bolt deviation restricting member 6 is a wedge-shaped member having a tapered surface 6a inclined toward the rear side in the front-rear direction of the vehicle. A bolt insertion hole 6b is formed, which penetrates the longitudinal center of the leaf spring 2 and has a counterbore for inserting the bolt 11 for positioning the axle 3.

The rear and front axle suspensions shown in FIGS. 1 and 2 are axle suspensions in which an axle 3 is fastened and fixed to the lowermost surface of a leaf spring 2 by a U-bolt 4. The present invention having the above configuration is also applied to an axle suspension in which the axle 3 is fastened and fixed to the uppermost surface of the leaf spring 2 by a U bolt 4.

FIGS. 5 and 6 show another embodiment of the present invention. This other embodiment has a configuration in which a U-bolt displacement restricting member 60 (inner spacer) is interposed between the superposition of the leaf springs 2 between the plurality of U-bolts 4. 4 has a notch-shaped engaging portion 61 that engages with the shaft portion.

FIGS. 5 and 6 show another embodiment of the present invention.
The axle suspension of the type in which the axle 3 is fastened and fixed to the uppermost surface of the leaf spring 2 by the U-bolt 4 is the same as the axle suspension in which the axle suspension is fastened and fixed by the bolts 4. Applied.

At the time of a frontal collision of the vehicle or the like, a force for displacing the axle 3 to the front is generated due to its inertia.

However, since the present invention has the above-described structure, in the structure shown in FIGS. 1 and 2, the U-bolt displacement regulating member 5 regulates the displacement of the U-bolt 4.
That is, the U-bolt deviation restricting member 5 is a wedge-shaped member having a tapered surface 6a inclined toward the rear side in the front-rear direction of the vehicle. Accordingly, the axle 3 due to inertia at the time of a frontal collision of the vehicle tends to displace toward the upward slope of the U-bolt deviation restricting member 5, but is displaced forward by the upward gradient of the U-bolt deviation restricting member 5, that is, The displacement of the U-bolt 4 is restricted, and the forward displacement of the axle 3 is prevented.

The U-bolt 4 is displaced toward the upward slope of the U-bolt displacement regulating member 5 so that the U-bolt 4 is attracted by the gradient lift, and the tightening axial force of the axle 3 is increased to increase the axle 3 It also has the function of damping the displacement of.

In another embodiment of the present invention shown in FIGS. 5 and 6, even if the axle 3 is displaced forward due to inertia at the time of a frontal collision of the vehicle, the U-bolt 4 prevents the U-bolt displacement regulating member 60 ( Engagement part 61 of inner spacer)
, The displacement of the U bolt 4 is restricted, and the displacement of the axle 3 is prevented. In another embodiment of the present invention, the axle 3 due to inertia at the time of a front collision of the vehicle is not only displaced forward, but the U-bolt 4 at which the axle 3 due to the inertia at the time of rear collision of the vehicle is going to be displaced backward.
The displacement of the axle 3 can be restricted, and the rearward displacement of the axle 3 is prevented.

[0020]

As described above, according to the present invention, the U-bolt displacement restricting member having a simple shape and structure is provided between the uppermost or lowermost surface of the leaf spring and the plurality of U-bolts or between the plurality of U-bolts. At the time of collision of the vehicle, etc.
The displacement of the axle position is prevented by restricting the displacement of the bolt,
This has the advantage of eliminating the inconvenience of the vehicle structure caused by the displacement of the axle position.

[Brief description of the drawings]

FIG. 1 is a front view of a rear axle suspension of the present invention.

FIG. 2 is a front view of the front axle suspension of the present invention.

FIG. 3 is a partially broken front view of a U-bolt displacement regulating member.

FIG. 4 is a plan view of FIG. 3;

FIG. 5 is a front view of a main part showing another embodiment of the present invention.

FIG. 6 is a sectional view taken along the line AA of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Chassis frame 2 Leaf spring 3 Axle 4 U bolt 5 Spring seat upper 6 U bolt displacement restriction member 6a Tapered surface 60 Inner spacer 61 Engagement part

Claims (3)

[Claims] 1. An axle suspension in which an axle is fastened and fixed to a leaf spring attached to a chassis frame by a plurality of U-bolts, wherein a U-bolt is provided between an uppermost surface or a lowermost surface of the leaf spring and the plurality of U-bolts. An axle suspension characterized by being provided with a displacement regulating member. 2. The axle suspension according to claim 1, wherein the U-bolt displacement restricting member is a wedge-shaped member having a tapered surface inclined rearward in a front-rear direction of the vehicle. 3. An axle suspension in which an axle is fastened and fixed to a leaf spring attached to a chassis frame with a plurality of U-bolts, wherein a bolt displacement regulating member having an engaging portion for engaging with the U-bolt is provided on the leaf spring. An axle suspension characterized by being interposed during the polymerization.