JP2573914Y2 - Cab / rear support structure for lorry - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a cab of a lorry having improved cab riding comfort by providing a cushioning means such as a spring or a mule between a chassis of the lorry and a cab as a cab. The present invention relates to a rear support structure .

[0002]

2. Description of the Related Art Conventional cab-rear support for a truck.
Figure 4 structure, are shown in FIG. As shown in the figure,
The yaw-side support structure includes a main hook pin 2 provided at the center of a float bar 1 whose left and right sides are inclined upward, and shoulder rubbers 3 provided at both left and right sides of the float bar 1, which are not shown. The rear side of the cab is supported.

On the lower surface of the float bar 1, a leaf spring 5 having left and right ends attached to a cab mount bracket 4 is mounted. On the lower surface of the float bar 1 on both left and right sides of the leaf spring 5, Stopper rubber 6 to contact leaf spring 5
Is attached.

A shock absorber 7 is attached between both sides of the cab mount bracket 4 attached to a chassis (not shown) of the vehicle body and both sides of the float bar 1, and vibration and swing between the chassis and the cab are prevented. It is absorbed by the leaf spring 5 and the shock absorber 7.

However, when the above-mentioned vibration and swing increase, the stopper rubber 6 comes into contact with the leaf spring 5 so that no more force is applied to the leaf spring 5.

[0006]

In such a cab-rear-side support structure in which the cab is supported by the leaf spring 5 and the shock absorber 7, the spring constant and the stroke of the leaf spring 5 for supporting the weight of the cab are provided. Is constant, if the weight of the cab increases, the leaf spring 5 is already in a compressed state by the cab weight, and the stroke is reduced.

Therefore, on a rough road or the like, the leaf spring 5
Is exhausted, the stopper rubber 6 comes into contact with the leaf spring 5, and an interference state occurs in the cab.

If the spring constant is increased to reduce the amount of deformation of the leaf spring 5 with respect to the load in order to improve this bottoming phenomenon, a small amount of vibration is transmitted to the cab as it is, and the ride comfort is deteriorated. Would.

Conversely, if the spring constant is reduced, a large stroke is required to receive a large load, and suspension of a heavy cab becomes difficult with the leaf spring 5 having such a low spring constant.

Incidentally, there is a cab suspension device using a leaf spring as shown in Japanese Utility Model Publication No. Sho 62-30841, but the above disadvantage cannot be solved. The present invention is based on the conventional cab
It solves the above-mentioned problems of the structure and provides a good ride comfort without being affected by fluctuations in the cab weight due to the roof rack, cab width, number of occupants, special specifications, etc. The purpose is to gain.

[0011]

According to the present invention, a cab mount bracket and a float bar are attached via a leaf spring provided at a center portion thereof and shock absorbers provided at right and left sides, and the cab is mounted on the float bar. Cab-rear support structure for a lorry that supports the rear side of the truck
The cab mount bracket is a pair of left and right
A vertical riser, and continuous with both risers,
The shock absorber is made up of a cab
Supported by the rising part of the mount bracket,
Rings at both ends on horizontal section of cab mount bracket
It is configured as a support band, and the leaf spring
The cover bar is evenly supported, and the gap between the leaf spring above the cab mount bracket is
Is provided .

[0012]

[Function] In the cab / rear support structure of the present invention,
When the cab weight is light or on a good road, only the leaf spring acts to support a large stroke.When the cab is heavy or on a bad road, the leaf spring and bumper rubber work to The load is supported with a small stroke.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Cab / rear support of this embodiment
The holding structure is such that a main hook pin 2 provided at the center of the float bar 1 and shoulder rubbers 3 provided on both left and right sides of the float bar 1 support the rear side of the cab (not shown). The only difference is that the position of the shoulder rubber is different from the conventional one.

The leaf springs 5 attached to the cab mount bracket 4 attached to the chassis of the vehicle body are attached to the left and right ends so that the leaf springs 5 do not overlap with the float bar 1 and are shifted forward or rearward of the float bar 1. The shock absorber 7 is provided between the left and right sides of the mount bracket 4 and the left and right sides of the float bar 1.

Although the vibration of the cab is absorbed by the leaf spring 5 and the shock absorber 7 as in the prior art, the upper surface of the cab mount bracket 4 below the leaf spring 5 has a non-linear spring constant. Is mounted.

Accordingly, the vibration of the vehicle is transmitted to the cab mount bracket 4 and is absorbed by the curvature of the leaf spring 5 while its amplitude is small, but it is limited by the roof rack, the cab width, the number of occupants, and special specifications. When the cab weight increases and the leaf spring 5 is already in a curved state, or when the amplitude increases due to a rough road or the like, the leaf spring 5 contacts the bumper rubber 8 as shown in FIG. And acts to crush this.

Therefore, after the bumper rubber 8 and the leaf spring 5 come into contact with each other, the combined spring constant of the bumper rubber 8 and the leaf spring 5 acts as a buffering force for the cab.

For example, in FIG. 2A, the stroke of the leaf spring 5 in contact with the bumper rubber 8 is from 0 to 20 mm.
In the state, the cab is supported only by the spring constant of the leaf spring 5, and the subsequent state of B in FIG. The cab is supported. The load supporting the cab and the deflection diagram at this time are shown in FIG.
Is shown in

As described above, in the present embodiment, even after the leaf spring 5 comes into contact with the bumper rubber 8, the leaf spring 5 exerts a spring action, so that the bottoming phenomenon as in the conventional suspension device can be eliminated. Things.

The bumper rubber 8 achieves the object of the present invention by providing a shape other than a conical shape and a number other than 2 as long as the shape can make the spring constant non-linear. Arbitrary changes can be made to the extent possible.

[0021]

As described above, according to the present invention, only the spring constant of the leaf spring acts when the amplitude of a general road or the like which normally travels from a good road is small. A comfortable ride.

When the amplitude is increased due to the rough road, or when the weight of the cab is increased and the margin of the amplitude stroke is reduced, the spring constant obtained by combining the leaf spring and the bumper rubber is given by: Supports large loads with small strokes.

Therefore, a riding comfort commensurate with running conditions such as good roads, general roads and bad roads, and cab weight can be obtained.
It is possible to prevent the bottom spring phenomenon occurring in the leaf spring and a reduction in the life of the leaf spring due to a low spring constant for improving ride comfort.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment of the present invention.

FIG. 2 is a front view when the leaf spring is bent.

FIG. 3 is a load and deflection diagram of the same.

FIG. 4 is a front view of a conventional cab / rear side support structure .

FIG. 5 is a plan view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Float bar 4 Cab mount bracket 5 Leaf spring 7 Shock absorber 8 Bumper rubber

Claims (1)

(57) [Scope of request for utility model registration] 1. A lorry in which a cab mount bracket and a float bar are mounted via a leaf spring provided in a central portion thereof and shock absorbers provided on right and left sides, and a rear side of the cab is supported on the float bar. The cab- mount bracket is a pair of right and left vertical
Part, and a horizontal part that is continuous with both rising parts and is perpendicular to the rising part.
The shock absorber is mounted on the cab mount bracket.
The leaf spring is supported by the
Float bar is evenly supported on the leaf spring.
Is, in the gap between the leaf spring positioned over said cab mount brackets, cab rear support structure of the truck, characterized in that Banparaba is provided.