JPH09105707A - Flat belt device in road simulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent water leakage and generation of noise during a high speed rotation by forming each roller out of a plurality of disks, and overlapping the respective disks each other at certain intervals in the axial direction of the respective rollers. SOLUTION: On the endless flat belt 5 arranged in the uppermost part of four shaking devices 3 in a road simulator 2, respective tires 4 of a testing vehicle 1 are placed, and the belt 5 serves as a substitute for road surface. A driving characteristic of the vehicle can be tested in the condition similar to an actual road condition, when the shaking devices 3 including the belt 5 are used so as to vibrate the belt 5 in the vertical direction, the wheels of the vehicle 1 are rotated at the ordinary rotational speed, and a steering wheel is turned so as to change the directions of the tires 4. Since the distance between the belt 5 and contact point of each roller in the belt advancing direction can be shortened without any reduction in the diameter of an intermediate roller, generation of noise can be prevented even when the belt 5 is rotated at a high speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road simulator for reproducing a running state of an automobile and performing a test, and more particularly to a road simulator using an endless flat belt.

[0002]

2. Description of the Related Art In a test apparatus for carrying out various performance tests while a vehicle is actually running, the wheels of the vehicle are placed on an endless flat belt to reproduce the contact state between the wheels and the road surface. Belt type road simulators have been used conventionally.

FIG. 6 shows an example of such a road simulator, which is an apparatus disclosed in Japanese Patent Laid-Open No. 6-249753. In this device, the movable portion 122 is made swingable by the first hydraulic jack 123 that is driven independently, and the support portion 127 is provided on the upper surface of the movable portion 122 so as to correspond to each of the wheels 126, and is driven independently. The second hydraulic jack 129 allows the support portion 127 to swing in the vehicle width direction, and each support portion 127 is provided with an endless flat belt 132 on which the wheels 126 are installed. By reproducing, tilting the support portion 127 to change the ground contact state of each wheel 126, reproduce various disturbances on the road surface, and accurately configure the running performance of the vehicle 125 in a wide range of road surface conditions. is there.

In the conventional road simulator having the above structure, since the endless flat belt 132 is supported from below, for example, the holding means 140 shown in FIG.
Is used. This holding means 140 is used for the hydraulic cylinder 1.
The holding means 41 is composed of a piston rod 142 that moves by hydraulic pressure and a support portion 143 fixed to the end of the piston rod 142. In addition, the portion 13 directly below the wheels of the endless flat belt 132
In order to prevent heat generation between the 2a and the upper surface 143a of the support portion 143 which is in contact with this portion 132a, water having a constant pressure is supplied between them.

As another holding means, there is one using a plurality of small diameter rollers 151 as shown in FIG.
The holding means 150 includes a plurality of small-diameter rollers 151 arranged on a support base 152, so that each roller 10
It is possible to perform the test while keeping the surface of the endless flat belt 132 as flat as possible by narrowing the interval between the contact points of the No. 5, 151 and the endless flat belt 132.

[0006]

However, when the holding means for the endless flat belt is used due to the above water pressure,
When the substitute road surface having this holding means is vibrated up and down,
Water leakage may occur in the holding means, which may adversely affect each device located below the holding means.

Further, when the holding means for the endless flat belt is composed of a plurality of small-diameter rollers, the trouble due to water leakage in the case of the holding means by the water pressure is solved, but when the endless flat belt is rotated at a high speed. However, since the supporting roller rotates at a high speed, there is a problem that noise is increased.

Therefore, the present invention has been made in view of the problems in the above-mentioned conventional road simulator. It does not cause water leakage and does not generate noise even when the endless flat belt is rotated at a high speed. It is an object to provide a flat belt device for a road simulator.

[0009]

The invention according to claim 1 is used in a plurality of road simulators for reproducing the running of a vehicle and performing a test, and is arranged between two rollers at both ends and between the rollers at both ends. In a flat belt device in which an endless flat belt wound around at least one intermediate roller is formed as a substitute road surface, each of the both end rollers and the intermediate roller is formed by a plurality of discs, and the discs of the respective rollers are formed. It is characterized in that they are overlapped with each other with a gap in the axial direction of each roller.

According to the first aspect of the present invention, each of the rollers for driving and supporting the endless flat belt is formed of a plurality of discs, and the discs of the respective rollers are arranged in the axial direction of the rollers. Since the layers are overlapped with a space provided therebetween, the distance between the belt and the contact point of each roller in the belt traveling direction can be shortened without reducing the diameter of the intermediate roller.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a specific example of an embodiment of a flat belt device in a road simulator according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a road simulator 2 according to the present invention. A vibrating device 3 is arranged below each tire 4 of the test vehicle 1, and an endless flat belt 5 is attached to each vibrating device 3 to form a substitute road surface. In addition, the moving means 1 for moving the test vehicle 1 on the endless flat belt 5
4 are provided.

The vibrating device 3 has the structure shown in FIG. That is, an endless flat belt 5 forming a substitute road surface is arranged below the tire 4, and three rollers 6, 7, 8 are provided to support and drive the endless flat belt 5.
Is provided. In the present embodiment, the central third roller 8 is connected to the roller driving device 9 to drive the endless flat belt 5 and to support the endless flat belt 5, and the first roller 6 and the first roller 6 at both ends. The two rollers 7 support the endless flat belt 5.
The first roller 6 is a tension roller,
It is biased in the direction of arrow A in the figure by the roller attraction device 10. Although the third roller 8 is driven in the present embodiment, the first roller 6 or the second roller 7 may be driven.

The vibrating force of the vibrating machine 13 in the vertical direction is equal to that of the vibrating shaft 1.
1 to the casing 14 and finally to the test vehicle 1. Further, a vibrating shaft rotation stopper 12 is provided to prevent the vibrating shaft 11 from rotating, and an end portion 12a thereof is connected to a bottom portion of the moving means 14.

FIG. 3 is a perspective view showing the shape of each first roller 6 or second roller 7. This roller 6 is 4
The discs 6A to 6D are attached to the shaft 6a at regular intervals via boss portions 6b. In FIG. 3, each disc 6
The thicknesses of A to 6D are the same, but when a larger load is applied to the central portion of the endless flat belt 5, the thickness of the disks 6B and 6C at the central portion is made thicker than the thickness of both ends 6A and 6B. Is preferred. Also, the third roller 8
As shown in FIG. 4 (b) or FIG. 5 (b),
Each disk is composed of three disks 8A to 8C so as to be inserted between the opposed disks of the first roller 6 and the second roller 7, respectively.

Next, referring to FIGS. 4 and 5, each roller 6,
The arrangement of 7 and 8 will be described. FIG. 4 shows a structure in which the endless flat belt 5 is driven by the third roller 8, and the endless flat belt 5 including the third roller 8 is supported by the first roller 6 and the second roller 7 at both ends. ing. And, as clearly shown in FIG. 4 (b), the discs of the first roller 6 and the third roller 8 and the discs of the second roller 7 and the third roller 8 are the axes of the rollers 6, 7, 8 with respect to each other. It is arranged so as to be superposed with a certain interval in the direction. That is, the disks 8A, 8B, 8C of the third roller 8 are respectively the first roller 6
Between 6A and 6B, between 6B and 6C, between 6C and 6D, and at the same time between 7A and 7B of the second roller 7, between 7B and 7C, between 7C and 7D It is arranged to be inserted between them.

On the other hand, FIG. 5 shows a structure in which the endless flat belt 5 is driven by the first roller 6 or the second roller 7, and like FIG. 4, the endless flat belt 5 is driven by the three rollers 6, 7, 8. A flat belt 5 is supported. And, as clearly shown in FIG. 5B, the discs of the first roller 6 and the third roller 8 and the discs of the second roller 7 and the third roller 8 are mutually aligned with the axes of the rollers 6, 7, 8. It is arranged so as to be superposed with a certain interval in the direction.

In the road simulator having the above structure, the tires 4 of the test vehicle 1 are placed on the endless flat belt 5 provided on the uppermost part of the four vibrators 3, and the endless flat belt 5 is A substitute road surface is formed, the endless flat belt 5 is vertically vibrated by using the vibrating device 3 including the endless flat belt 5, and the wheels of the test vehicle 1 are rotated at a normal rotation speed. Furthermore, by changing the direction of the tire 4 by turning the steering wheel, it becomes possible to test the driving characteristics of the vehicle under substantially the same conditions as on an actual road.

[0018]

According to the invention of claim 1, the distance between the belt and the contact point of each roller in the belt traveling direction can be shortened without reducing the diameter of the intermediate roller, so that the belt rotates at high speed. It is possible to provide a flat belt device in a road simulator that does not generate noise even if it is performed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a flat belt device in a road simulator according to the present invention.

FIG. 2 is a perspective view showing a main part of a vibration device used in the road simulator of FIG.

FIG. 3 is a perspective view showing a shape of a roller used in the vibration device of FIG.

4 (a) is a front view showing an example of the arrangement of rollers in the vibrating device of FIG. 2, and FIG. 4 (b) is a sectional view taken along the line I-I of FIG. 4 (a).

5A is a front view showing another example of the arrangement of each roller in the vibration device of FIG. 2, and FIG. 5B is a sectional view taken along line II-II of FIG.

FIG. 6 is a schematic diagram showing an example of a conventional road simulator.

FIG. 7 is a schematic view showing a conventionally used water pressure belt holding means.

FIG. 8 is a schematic view showing a holding means using a plurality of conventionally used small diameter rollers.

[Explanation of symbols]

 1 Test Vehicle 2 Road Simulator 3 Excitation Device 4 Tire 5 Endless Flat Belt 6 1st Roller 7 2nd Roller 8 3rd Roller 9 Roller Drive Device 10 Roller Attraction Device 11 Excitation Shaft 12 Excitation Shaft Rotation Stop 13 Excitation Machine 14 Transportation

Claims (1)

[Claims] 1. A plurality of two-end rollers, which are used in a road simulator for reproducing a vehicle to conduct a test,
In a flat belt device in which an endless flat belt wound around at least one intermediate roller arranged between the both end rollers is formed as a substitute road surface, each of the both end rollers and the intermediate roller is formed by a plurality of discs, A flat belt device in a road simulator, wherein discs of the respective rollers are overlapped with each other at intervals in the axial direction of the respective rollers.