JP2988510B2 - Vehicle frame 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 frame structure of a vehicle, particularly a bus, in which the floor surface can be set low.

[0002]

2. Description of the Related Art There is an increasing demand for lowering the floor of a bus, that is, a so-called low floor, in order to improve passengers' convenience by improving the getting on and off property of the bus. In addition to reducing the camber amount (warpage amount) of the leaf spring, the lower surface of the frame above the rubber helper on the upper surface of the leaf spring is positioned higher due to the reduction in the cross section of the frame. , To ensure the suspension stroke. However, since the reduction of the frame cross section is naturally limited due to the problem of strength, it is practically difficult to sufficiently lower the floor, and the stroke to the contact surface of the rubber helper tends to be short. , The ride quality of the bus tended to deteriorate.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a frame structure of a vehicle which can easily lower the floor of the vehicle without deteriorating the riding comfort of the vehicle. .

[0004]

In order to achieve this object, a vehicle frame structure according to the present invention comprises a main frame extending in the front-rear direction of the vehicle and having a leaf spring mounted thereon, and disposed above and outside the main frame. Being car
And a sub-frame which is connected with the main frame and the plurality of positions extending in both longitudinal directions, the lower surface of the upper SL sub-frame
There has been an up the contact surface of the rubber helper which is attached to the top Symbol leaf spring.

[0005]

That is, the main frame is disposed above and outside the main frame and extends in the vehicle front-rear direction.
It binding has been lower surface of the sub-frame, and constitute the contact surfaces of the rubber helper attached to the leaf spring,
Because the main frame does not constitute the contact surface of the rubber helper, the rigidity of the main frame does not become insufficient even if the cross section of the main frame is reduced to some extent, and
A sufficient stroke to the contact surface of the rubber helper can be ensured. Therefore, by forming the floor of the vehicle on the main frame, the floor of the vehicle can be easily reduced.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention shown in the drawings will be specifically described below. In the vicinity of the front axle 2 of the route bus 1, the left and right main frames 3, 3 have a substantially U-shaped cross section with a relatively small height, and the cross members 4,
5 and 6 are firmly connected by bolts, rivets, etc., and extend in the front-rear direction of the vehicle. Above the left and right main frames 3, 3, the cross section is substantially Z-shaped and the rear portion is bent outward. Sub-frames 7 and 7 are arranged, and the sub-frames 7 and 7 are
5 and 6 are firmly connected by bolts, rivets and the like.

One end of each of the connecting members 8, 8 having a substantially U-shaped cross section is welded to the upper ends of the outer surfaces of the left and right main frames 3, 3, respectively. The lower surfaces of the sub-frames 7, 7 are fixed by welding or the like, respectively, and the sub-frames 7, 7 are connected to the left and right main frames 3, 3 via cross members 4, 5, 6, and connecting members 8, 8, respectively. Main frame 3, 3
The floor 10 of the bus 1 is formed in contact with the upper surface of the bus 1.

Further, left and right leaf springs 11, each having a central portion attached to the front axle 2,
The front eyeball portions 12 are fixed to the outer surfaces of the main frames 3 and 3, respectively, and the rear shackle link portions 13 are also connected to the main frames 3 and 3, respectively.
The left and right shock absorbers 14, 14 fixed to the outer surface of the front axle 2 and having the lower ends respectively attached to the front axle 2, have the upper ends of the sub-frames 7, 7, respectively.
It is attached to the outside surface.

On the other hand, rubber helpers 15, 15 are fixed on the upper surfaces of the left and right leaf springs 11, 11, respectively, and the connecting members 8, 8 are respectively located above them. Rubber helper 1
The contact surfaces 5 and 15 are configured to function as stoppers for displacement of the vehicle body downward.

In the above device, the leaf spring 1
1 front eyeball portion 12 and rear shackle link portion 13
Are fixed to the outer surface of the main frame 3 respectively, and at the same time, the upper end of the shock absorber 14 is attached to the outer surface of the sub-frame 7 disposed above and outside the main frame 3. The lower surface of the connecting member 8, one end of which is welded to the upper end of the outer surface, is the contact surface of the rubber helper 15. 4, the stroke S of the rubber helper 15 can be sufficiently secured, and the rear portions of the sub-frames 7 are bent outward, respectively, so that the formation of the tire house 21 with respect to the front wheels is hindered. Nor.

Therefore, even if the front axle 2 is equipped with the leaf spring 11 and the shock absorber 14, the structure of the expensive front axle 2 is not changed at all, and the leaf spring 11 and the rubber helper 15 for the front axle 2 are not changed. Since the main frame 3 can be easily brought close to the front axle 2 without deteriorating the riding comfort while maintaining the positional relationship of the steering system and the like as before, the main frame 3 is formed in contact with the upper surface of the main frame 3. The floor 10 of the bus 1 can be made much lower than before without any extra cost increase. For example, the step at the entrance 22 of the bus 1 is changed from the conventional two-stage to one-stage. Etc.
The getting on / off property can be easily improved.

Further, in the conventional device in which the upper end of the shock absorber 14 is attached to the outer surface of the main frame 3, as shown in FIG. In contrast, the upper end of the shock absorber 14 is attached to the outer surface of the sub-frame 7 disposed on the outer side of the upper part of the main frame 3 in contrast to the value W0 between the three. Since the width of the floor 10 at the center can be increased to W between the left and right sub-frames 7 and 7, the low central passage in the bus 1 and the like can be increased, and the rear portions of the sub-frames 7 and 7 can be outside. And the span between the sub-frames 7 is widened, so that the floor 10 behind it can be formed low over a wide range. , Is very convenient from both sides of the indoor walking and the indoor equipment of the bus 1.

Further, since the lower surface of the connecting member 8 is a contact surface of the rubber helper 15 and the rubber helper 15 does not directly hit the lower surface of the main frame 3, the rigidity of the main frame 3 can be reduced accordingly. There are also advantages that can be achieved.

In the above embodiment, the lower portion of the sub-frame is formed so as to be substantially flush with the upper surface of the main frame. However, if necessary, the shape of the member connecting the sub-frame to the main frame may be changed. Due to changes, etc.
Even if the lower portion of the sub-frame is appropriately positioned above or below the upper surface of the main frame outside the main frame and is connected to the main frame, substantially the same operation and effect as in the above embodiment can be achieved.

Further, the connecting member in each of the above embodiments is fixed to the lower upper surface or the lower side surface of the sub-frame,
So that the subframe is connected to the mainframe,
Alternatively, since the sub-frame is firmly connected to the front and rear cross members, the connection member is changed to be omitted, and even if the lower surface itself of the sub-frame constitutes the contact surface of the rubber helper, It is possible to obtain substantially the same operation and effect as the above embodiment.

Further, in each of the above embodiments, the frame structure is provided in the vicinity of the front axle of the rear wheel drive vehicle. However, a dedicated differential case or the like is used for a front wheel drive vehicle in which a rear axle is not provided with a differential case, or a rear wheel drive vehicle. In this case, it is needless to say that the same operation and effect as those of the above-described embodiments can be achieved by using the same device as the above-described embodiments as the frame structure near the rear axle.

[0017]

In the vehicle frame structure according to the present invention, the lower surface of the sub-frame connected to the main frame at a plurality of points constitutes the contact surface of the rubber helper, and the stroke to the contact surface of the rubber helper is sufficient. As a result, the floor of the vehicle can be easily reduced, so that there is an advantage that the getting on and off of the vehicle can be improved without extra cost increase.

[Brief description of the drawings]

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

FIG. 2 is a top view of a main part of the embodiment.

FIG. 3 is a left side view of a main part of FIG. 2;

FIG. 4 is an enlarged cross-sectional view taken along the line IV-IV in FIG. 3;

[Explanation of symbols]

 2 Front axle 3 Main frame 7 Sub frame 8 Connecting member 10 Floor surface 11 Leaf spring 14 Shock absorber 15 Rubber helper

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B62D 21/11

Claims (3)

(57) [Claims] 1. A main frame which extends in the front-rear direction of a vehicle and has a leaf spring attached thereto, and the main frame is disposed above and outside the main frame and extends in the vehicle front-rear direction.
Frame structure for a vehicle and a sub-frame which is connected with the frame and a plurality of places, constituting a contact surface of the rubber helper lower surface of the upper SL sub frame is attached to the upper Symbol leaf spring. 2. The vehicle frame structure according to claim 1, wherein a shackle link portion of the leaf spring is attached to a side surface of the main frame. 3. The vehicle frame structure according to claim 1, wherein the eyeball portion of the leaf spring is attached to a side surface of the main frame.