JP2001122153A - Chassis frame for low floor bus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chassis frame for a low floor bus capable of expanding a width size of a cabin passage floor face near front tires. SOLUTION: A front side supporting part 21, supporting the front tires 5 and interposed between a chassis front part 3 and a chassis intermediate part 8, is constituted by tire housing members 22 covering the front tires 5 from above, and a floor member 23 continuous with the right and left tire housing members 22 so as to cover the front tires 5 from a cabin center side and forming the cabin passage floor face F. Deflection in up and down directions of a portion of the floor member 23 forming the cabin passage floor face F is prevented by a portion of the floor member 23 covering the front tires 5 from the cabin center side. Deflection in right and left directions of the portion of the floor member 23 covering the front tires 5 from the cabin center side is prevented by the tire housing members 22. By this, it is possible to expand the width size of the cabin passage floor face F near the front tires 5 while maintaining rigidity of the whole of the front side supporting part 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chassis frame for a low floor bus.

[0002]

2. Description of the Related Art In recent years, the height of the floor in a vehicle compartment, particularly the floor of a passage located at the center in the width direction of the vehicle compartment, has been designed to be low so that users can easily get on and off the vehicle. A low-floor bus has been developed in which the height difference between the tread and the floor of the passage is very small or the height difference is eliminated.

FIGS. 4 to 6 show an example of a chassis frame of a conventional low-floor bus. This chassis frame has a driver's seat 1 on the right side and an entrance 2 on the left side. 3, a front support portion 6 following the chassis front portion 3 and supporting the front tire 5 via the suspension device 4, and a chassis following the front support portion 6 and having an entrance 7 on the left side. An intermediate portion 8, a rear support portion 10 following the chassis intermediate portion 8 and supporting a rear tire 9 via a suspension device (not shown), and a rear end portion following the rear support portion 10 And a chassis rear portion 11 on which an engine (not shown) is mounted.

The front support portion 6 includes a frame 14 for connecting the cross member 12 at the rear end of the chassis front portion 3 and the cross member 13 at the front end of the chassis middle portion 8, a bracket 15 fixed to the cross member 12, and a cross member. 13 and a side frame 17 connecting a bracket 16 fixed to the bracket 13.

[0005] The suspension device 4 has a front axle 18 for pivotally supporting the front tire 5 at both left and right ends, and the front axle 1
8 includes a bracket 19 provided on the left and right sides of the front frame 8 and a front suspension 20 interposed between the side frame 17 of the front support 6 and the bracket 19.

[0006]

However, FIG. 4 to FIG.
The chassis frame shown in the figure below is less than 9m long and 2.2m wide.
When the present invention is applied to a medium-sized bus, the bracket 19 and the front suspension 20 of the suspension device 4 and the frame 14 of the front support portion 6 are interposed between the left and right front tires 5. The width dimension B1 of the floor surface F of the passenger compartment becomes narrow.

Further, in order to increase the width B1 of the floor surface F of the passenger compartment passage, the relative positions of the bracket 19 and the front suspension 20 of the suspension device 4 and the frame 14 of the front support 6 are made as close as possible. Then, the maximum steering angle of the front tire 5 becomes smaller, the turning radius of the vehicle is enlarged, and the mobility of the bus is reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a chassis frame of a low-floor bus in which the width of a floor surface of a cabin passage near a front tire can be increased.

[0009]

In order to achieve the above object, a chassis frame for a low-floor bus according to the present invention supports a front part of a chassis in which a driver's seat is installed, and supports a front tire and follows the front part of the chassis. A front support portion, a chassis middle portion following the front support portion, a rear support portion supporting the rear tire and following the chassis middle portion, and a chassis rear portion following the rear support portion; A front support portion is constituted by a tire house member that covers the tire from above, and a floor member that is connected to the left and right tire house members so as to cover the front tire from the vehicle center side and that forms a vehicle room passage floor surface. I have.

In the chassis frame of the low floor bus according to the present invention, the vertical deformation of a portion of the floor member forming the floor surface of the cabin passage is covered by covering the front tire of the floor member from the vehicle center side. To prevent the left and right deflection of the part covering the front tire of the floor member from the center of the cabin,
This is prevented by the tire house member, and the rigidity of the entire front support portion is maintained.

[0011]

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

FIGS. 1 to 3 show an embodiment of a low-floor bus chassis frame according to the present invention.
The parts denoted by the same reference numerals as those in FIG. 6 represent the same objects.

This chassis frame has a driver's seat 1 on the right side and an entrance 2 on the left side.
A front support portion 21 that follows the chassis front portion 3 and supports the front tire 5 via the suspension device 4; and a chassis middle that follows the front support portion 21 and is provided with the entrance 7 on the left side. Part 8 and a rear support part 1 following the chassis middle part 8 and supporting a rear tire 9 via a suspension (not shown)
0 and a rear chassis 11 that follows the rear support and at the rear of which an engine (not shown) is mounted.

The front support portion 21 includes a tire house member 22 provided for each front tire 5 and left and right tire house members 2.
2 and a support member 24 to which the front suspension 20 of the suspension device 4 is mounted.

The tire house member 22 is formed by processing a steel plate so as to cover the front tire 5 from the upper side and the rear side.

The front end of the tire house member 22 is fixedly welded to a bracket 15 attached to the cross member 12 at the rear end of the chassis front part 3, and the rear end of the tire house member 22 is connected to the middle part 8 of the chassis. It is fixed to the cross member 13 by welding.

The floor member 23 is formed by processing a steel plate so as to be continuous with the left and right tire house members 22 so as to cover the front tire 5 from the center of the vehicle compartment and to form a floor surface F of the vehicle compartment passage.

The left and right edges of the floor member 23 are overlapped and welded to the edge of the tire house member 22 on the center side of the vehicle compartment, and the front and rear edges of the floor member 23 are They are welded and fixed on the upper surfaces of the substrates 12 and 13.

The support member 24 is formed by processing a steel plate into a shape that comes into contact with the lower surface of the tire house member 22 and the outer surface of the floor member 23.

The support member 24 is welded and fixed along the lower surface of the tire house member 22 and the outer surface of the floor member 23 so as to correspond to the left and right front suspensions 20 of the suspension device 4.

In the chassis frame of the low floor bus shown in FIGS. 1 to 3, a portion of the floor member 23 that covers the front tire 5 from the center of the cabin (a portion of the floor member 23 closer to the left and right vehicle) is a floor member. 23 (the floor member 2)
3) to prevent vertical bending of the middle part in the vehicle width direction)
The tire house member 22 prevents the portion of the floor member 23 covering the front tire 5 from the vehicle center side from bending in the left-right direction, and the rigidity of the front support portion 21 is maintained.

Further, the support member 24 prevents the vicinity of the welded portion between the tire house member 22 and the floor member 23 from being twisted, and the rigidity of the front support portion 21 is further improved.

Therefore, the members such as the frame 14 in the chassis frame of the conventional low floor bus shown in FIGS. 4 to 6 become unnecessary, and when the bus width is equal, the front tire 5
The width B2 of the cabin passage floor F in the vicinity can be increased as compared with the conventional width B1, and the maximum steering angle of the front tire 5 does not decrease, and the mobility of the bus does not decrease.

Furthermore, in the chassis frame of the conventional low-floor bus, a member for forming a tire house is separately mounted on the front support portion 6, but in the chassis frame of the low-floor bus shown in FIGS. , Tire house member 22, and floor member 2
Since the left and right vehicle side parts also serve as strength members,
The number of members can be reduced.

The low-floor bus chassis frame of the present invention is not limited to the above-described embodiment.
Of course, changes can be made without departing from the spirit of the present invention.

[0026]

As described above, according to the low-floor bus chassis frame of the present invention, the following various excellent effects can be obtained.

(1) A vertical portion of the floor member, which forms the floor surface of the cabin passage, is prevented by a portion of the floor member that covers the front tire from the center side of the vehicle room. The width of the floor of the passenger compartment floor near the front tire is maintained because the tire house prevents the part that covers the front tire from the center of the vehicle compartment from bending in the left-right direction and maintains the rigidity of the entire front support. The dimensions can be widened, the maximum steering angle of the front tire is not reduced, and the mobility of the bus does not decrease.

(2) Since the portions of the tire house member and the floor member closer to the left and right vehicles also function as strength members, the number of members can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of an embodiment of a chassis frame of a low floor bus of the present invention.

FIG. 2 is a side view of a front support portion in FIG.

FIG. 3 is a view taken in the direction of arrows III-III in FIG. 2;

FIG. 4 is a perspective view showing an example of a chassis frame of a conventional low floor bus.

FIG. 5 is a side view of the front support section in FIG. 4;

FIG. 6 is a view taken in the direction of arrows VI-VI in FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Driver's seat 3 Chassis front part 5 Front tire 8 Chassis middle part 9 Rear tire 10 Rear side support part 11 Chassis rear part 21 Front side support part 22 Tire house member 23 Floor member F Car room passage floor surface

Claims (1)

[Claims] 1. A chassis front portion on which a driver's seat is installed; a front support portion that supports a front tire and follows the chassis front portion;
A chassis middle portion following the front support portion, a rear support portion supporting the rear tire and following the chassis middle portion, and a chassis rear portion following the rear support portion, and the front tire is positioned from above. The front support portion is constituted by a tire house member to be covered and a floor member connected to the left and right tire house members so as to cover the front tire from the vehicle center side and forming a floor surface of the vehicle interior passage. Floor bus chassis frame.