JP3355960B2 - Body structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body structure such as a bus, and more particularly, to a structure of a leaf spring support portion in a chassis frame extending in a vehicle longitudinal direction.

[0002]

2. Description of the Related Art As this kind of structure, for example, FIGS.
There is a frame structure as shown in FIG.

This shows a front frame portion of a large bus, and an appropriate number (four in the illustrated example) of cross members 2a to 2d are provided between a pair of left and right front side front rails 1A and rear side front rails 1B. A ladder-type frame is formed to be erected.

An appropriate number (two in the illustrated example) of outriggers 3a to 3d protrude outside the front and rear front side rails 1A and 1B. Reference numeral 4 in FIG. 6 denotes an air tank support.

The front-side front side rail 1A and the rear-side front side rail 1B are connected to each other by a first
Using a plurality of gussets such as a third gusset 5a to 5c,
Through the cross member 2c and the outriggers 3a and 3b,
The front side rails 1A are connected stepwise so as to be lower.

Accordingly, the front side front rail 1A side has a low floor, and a front step for getting on and off is formed on the left side of the vehicle body by using the low floor.

On the other hand, the rear side front side rail 1
Spring hangers 6a and 6b are attached to both front and rear portions with screws 7 and the like, and a leaf spring 8 is bridged between these hangers 6a and 6b to suspend an axle 10 of both left and right front tires 9. ing.

[0008]

However, in the above-described conventional frame structure, the spring hanger 6a,
8b is attached using the lower surface and side surface of the rear front side rail 1B (FIG. 8).
), The front end of the rear front side rail 1B cannot be moved backward from the current position. (Because the length of the leaf spring 8 cannot be changed. If the spring hanger 6a is to be attached to the front side front rail 1A, the front side front rail 1A will be in the vehicle width direction like the rear side front rail 1B. (Because the U-shaped cross section opens toward the side, the mounting position of the spring is lowered.)

Therefore, it is not possible to increase the length of the lower front side side rail 1A to form a wide front step (entrance), thereby improving the getting on / off property.

Accordingly, an object of the present invention is to connect the rear frame and the front frame using a connecting member having a predetermined shape, thereby increasing the length of the front frame at a low level without affecting the attachment of the leaf spring. It is an object of the present invention to provide a vehicle body structure that can achieve the above.

[0011]

In order to achieve the above object, a vehicle body structure according to the present invention has a U-shape which extends downward in the vehicle longitudinal direction and opens downward on the lower surface of the front end of a rear frame extending in the vehicle longitudinal direction. A top surface of a connecting member having a cross section is fixed, a front portion of the connecting member is disposed forward of the vehicle from a front end of the rear frame, and a mounting member for mounting a leaf spring is disposed inside the front portion of the connecting member. And a front frame extending from the front end of the connecting member to the front of the vehicle with the upper surface of the frame substantially flush with the top surface.

According to this, the front part of the connecting member having the U-shaped cross section that opens downward and forward from the rear side frame is located, so that the mounting member for mounting the leaf spring can be disposed inside the front part of the connecting member. Therefore, the amount of extension of the front end of the higher rear frame with respect to the leaf spring mounting member can be reduced, and the substantial length of the lower front frame can be substantially increased.

It is preferable that the connecting member and the front frame are connected via an outrigger, because the number of gussets can be reduced and the shape can be simplified.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a vehicle body structure according to the present invention will be described in detail with reference to embodiments.

FIG. 1 is a plan view of a front frame portion of a large bus showing one embodiment of a vehicle body structure according to the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a line AA of FIG. FIG. 4 is a perspective view of a connecting portion between a front side front rail and a rear side side rail, and FIG. 5 is a perspective view of the connecting portion with a main gusset omitted. In these figures, the same members and parts as those in FIGS. 6 to 9 are denoted by the same reference numerals, and detailed description is omitted.

As shown in FIGS. 1 and 2, four cross members 2a to 2d are provided between a pair of left and right front side front rails 1A (front frame) and rear front side rails 1B (rear frame). A ladder-type frame is formed to be erected.

Two outriggers 3a to 3d protrude outside the front and rear front side rails 1A and 1B, respectively. In FIG. 1, reference numeral 4 denotes an air tank support.

The front side front side rail 1A
The rear side front side rail 1B uses a plurality of gussets as before, and the cross member 2c and the outrigger 3
a, 3b, the front side front side rail 1
It is connected stepwise so that the A side is low.

In this embodiment, as shown in FIGS. 3 and 5, at the connecting portion on the left side of the vehicle body where the entrance / exit is formed, the connecting member 20 having a hat-shaped cross section and the first to sixth connecting members are provided.
The gussets 21 to 26 are used to connect the front side front rail 1A to the lower side via the cross member 2c and the outrigger 3a.

The connecting member 20 has its rear top surface joined to the lower surface of the rear front side rail 1B.
The front part of the connecting member 20 is a rear front side rail 1B.
Of the vehicle from the front end of the vehicle. A spring hanger 6a (front side) as an attachment member for attaching a leaf spring is attached to the inside of the front part of the connecting member 20 with a rivet 7 or the like (see FIG. 3). A leaf spring 8 is bridged between the spring hanger 6b and the axle 10 of the left and right front tires 9 is suspended.

The connecting portion will be described in detail.
0 is closed by a flat fifth gusset 25 fixed to the three end face flanges 20a, 20b, 20c of the connecting member 20, and a channel type fourth gusset 24 is provided on the front surface of the fifth gusset 25. The rear end of the front-side front side rail 1A is connected via the.

The second gusset 22 extends over three lower surfaces of the lower flange of the cross member 2c having the Z-shaped cross section and the lower flange of the outrigger 3a formed in a stepped shape. Is fixed.

On the other hand, the front side front rail 1A, the upper flange of the cross member 2c, the connecting member 20
And over the four upper surfaces of the step portion of the outrigger 3a,
Gusset 21 is fixed.

Further, of the left and right side flanges 20d and 20e of the connecting member 20, the left side flange 20d is on the lower flange upper surface of the outrigger 3a, and the right side flange 20e is on the lower flange upper surface of the cross member 2c. , Respectively.

An L-shaped sixth gusset 26 is fixed to an upright plate portion 21a of the first gusset 21, which is formed by bending upward at the left side surface of the connecting member 20 and flush with the left side surface. Is done.

The front end of the rear front side rail 1B is fixed to the upper surface of the first gusset 21 corresponding to the upper surface (top surface) of the connecting member 20.

The rear front side rail 1
B, an upper flange upper surface of the outrigger 3a, and a third gusset 23 having a predetermined shape over the upper surface of the first gusset 21.
Is fixed.

As described above, in the present embodiment, the connecting member 20 having the hat-shaped cross section and the first to sixth gussets 21 to 26 having a predetermined shape are used, and the cross member 2c and the outrigger 3a having the predetermined shape are used. , The front side side rail 1A side was connected to be lower,
The substantially lower front side front side rail 1A length can be increased by a predetermined length of the connecting member 20. In other words, the amount of protrusion of the front end of the higher rear side front side rail 1B can be reduced.

As a result, the space on the low floor of the vehicle can be increased, and the front step width of the entrance can be increased to improve the entry / exit performance.

On the other hand, a front-side spring hanger 6a is provided inside the front portion of the connecting member 20 having a hat-shaped cross section.
Is mounted at the same position as before (in the front-rear and left-right directions of the vehicle) while maintaining the mounting strength as before, so that the front end of the leaf spring 8 can be supported without any trouble.

In the above-described embodiment, an example in which the present invention is applied to the connecting portion between the front side front rail 1A and the rear side front rail 1B at the entrance on the left side of the vehicle body has been described. The present invention can also be applied to a connecting portion between the front side front rail 1A and the rear side front rail 1B on the right side of the vehicle body.

The present invention is not limited to the above embodiment,
For example, as the connecting member, a member in which the flange portions 20d and 20e of the connecting member 20 in the above embodiment are omitted may be used. In addition, various changes such as a change in the number of gussets and a change in shape may be made without departing from the scope of the present invention. Changes are possible.

[0033]

As described above, according to the present invention, the amount of front end extension of the higher rear frame can be reduced, and the substantial length of the lower front frame can be increased. The space can be increased, and when applied to the entrance on the left side of the vehicle body, the front step width of the entrance can be increased to improve the entry / exit performance.

When the connecting member and the front frame are connected via an outrigger, the number of gussets can be reduced and the shape can be simplified.

[Brief description of the drawings]

FIG. 1 is a plan view of a front frame portion of a large bus, showing one embodiment of a vehicle body structure according to the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a perspective view of a connecting portion between a front side front rail and a rear side side rail.

FIG. 5 is a perspective view in which a main gusset of the connecting portion is omitted.

FIG. 6 is a plan view of a front frame portion of a conventional large bus.

FIG. 7 is a side view of the same.

FIG. 8 is a sectional view taken along the line BB of FIG. 7;

FIG. 9 is a perspective view of a connecting portion between a front side front rail and a rear side side rail.

[Explanation of symbols]

1A Front Front Side Rail (Front Frame) 1B Rear Front Side Rail (Rear Frame) 2a-2d Cross Member 3a-3d Outrigger 6a, 6b Spring Hanger 8 Leaf Spring 9 Front Tire 10 Axle 20 Connecting Member 21-26 1st to 6th gusset

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B62D 21/11 B62D 21/02

Claims (2)

(57) [Claims] A top surface of a connecting member having a U-shaped cross section extending in the vehicle front-rear direction and opening downward is fixed to a lower surface of a front end of a rear frame extending in the vehicle front-rear direction. The rear frame is disposed forward of the front end of the vehicle, and a mounting member for mounting a leaf spring is disposed inside a front portion of the connecting member. The upper surface of the frame is substantially flush with the top surface from the front end of the connecting member. A vehicle body structure, wherein a front side frame is extended forward of the vehicle. 2. The vehicle body structure according to claim 1, wherein the connecting member and the front frame are connected via an outrigger.