JPH052862Y2 - - Google Patents

Description

[Detailed description of the invention] "Field of industrial application" The present invention relates to a speedometer testing machine for automobiles, and in particular, it is equipped with a front roller on which the front wheels of the vehicle under test are placed, and a rear roller on which the rear wheels of the vehicle under test are placed. This invention relates to a so-called standard type automobile speedometer testing machine in which these rollers are rotated by the drive wheels of the vehicle under test.

``Prior Art'' Generally, standard speedometer testers are instructed by a method of detecting the rotational speed from the engine drive system. In other words, when bench testing speedometers, either the front or rear drive wheels of the vehicle under test are placed on multiple rollers supported by bearings, and then the vehicle under test is placed in a normal position. The rollers are rotated by the drive wheels while the vehicle is running, and accuracy is measured by comparing the number of rotations of the rollers with the speedometer reading.

By the way, in recent years, four-wheel drive vehicles (4WD), which have been mainly used for operational and work purposes as vehicles aimed at improving off-road running performance, have been widely incorporated into on-road passenger vehicles, and the concept has changed. teeth,
Including the front and rear axle direct connection type shown in Figure 3A, as well as the center differential with equally distributed driving force shown in Figure 3B.
A type with a CD, a type with a planetary gear mechanism etc. installed on the CD shown in Figure 3C, with unequal distribution of driving force in the front and rear, Figure 3D
A wide range of models are available, including the constant four-wheel drive (full-time) type with viscous springs between the axles, as shown in the figure.

However, the roller of the speedometer test machine can only test the various types of four-wheel drive vehicles (4WD) with such various mechanisms, either the front-rear drive vehicle (FWD) or the rear-wheel drive vehicle (RWD) mentioned above. If the front wheels are placed in the is being transmitted, so the vehicle under test is constantly exerting force in the forward direction, which is dangerous as there is a risk of it flying off.

Therefore, when testing the speedometer of a four-wheel drive vehicle, it is necessary to place the front and rear wheels on front rollers and rear rollers, respectively, so that the front and rear wheels can rotate simultaneously.

Conventionally, a speedometer testing machine for an automobile, which is equipped with a front roller and a rear roller that rotate by the driving wheels (front wheels or rear wheels) of the vehicle under test, and in which both rollers are synchronized, is a type shown in FIG. An example has been provided.

That is, the testing machine The front and rear belts 6 and 7 were connected via an intermediate pulley 5 so as to rotate as shown in FIG.

However, since the synchronization means in Test Machine X is mechanical, it has disadvantages such as a complicated structure, difficulty in installation, relatively large installation space, and high cost.

``Problems to be solved by the present invention'' In view of the above-mentioned drawbacks of the conventional technology, the present invention is easy to install, does not require much installation space, and is suitable for front-wheel drive and rear-wheel drive vehicles only. We have developed an inexpensive automobile speedometer tester that can automatically or artificially select and rotate the front rollers and/or rear rollers synchronously, even for various types of four-wheel drive vehicles equipped with various mechanisms. There is something to be gained.

"Means for Solving the Problems of the Present Invention" The automobile speedometer testing machine of the present invention is an automobile speedometer testing machine in which a front roller and a rear roller are synchronized. It is characterized in that roller speed variable speed means are respectively provided which are electrically controlled by a control device so as to be synchronized.

"Embodiments of the present invention" The present invention will be described in detail below with reference to embodiments shown in the drawings.

In one embodiment shown in FIGS. 1 and 2,
Reference numeral 11 denotes front rollers on which the front wheels 13 of the vehicle under test 12 can be placed and set. In this embodiment, four rollers are supported by the frame 15 of the testing machine Y via bearings 14. Among the four rollers 11, the front rollers 11a, 11a are connected to a connecting member 1 such as a universal joint or a chain coupling in order to prevent the vehicle under test 12 from differential slipping.
The left and right sides are connected by 6. 17 is a first roller speed variable speed means provided at one end of the front roller 11a, and in this embodiment, a variable speed motor 17 is used. First roller speed variable speed means 17
It is also possible to use a motor equipped with a continuously variable transmission instead of the variable speed motor. 18 is a variable speed motor 17
This is a first rotational speed detector of a generator, a gear box for driving a flexible shaft, etc., which detects the speed of the variable speed motor 17.
On the other hand, reference numeral 19 denotes a rear roller on which the rear wheel 20 of the vehicle under test 12 can be placed and set. Like the front roller 11, this rear roller 19 is also supported by the frame 15a via a bearing 14a, and the front rollers 19a, 19a are connected via a connecting member 16a. The position of the rear roller 19 corresponds to the vehicle interval between the test vehicles 12, and can be varied back and forth by a transmission mechanism using a link mechanism, a spline shaft, etc., although not particularly shown. 2
1 is a second roller speed variable speed means provided at one end of the front roller 19a of the rear roller 19, and the structure of this second roller speed variable speed means 21 is the same as that of the first roller speed variable speed means 17. be. Therefore, the second roller speed variable speed means 21 also uses a variable speed motor or a motor equipped with a continuously variable transmission. A second rotation speed detector 22 is provided on the variable speed motor 21 as a second roller variable speed means and detects the speed of the variable speed motor 21. The structure of the second rotation speed detector 22 is also as follows. This is the same as the first rotation speed detector 18 described above.

23 is the first and second rotation speed detector 18, 2
2 to the first roller speed variable speed means 17 on the front roller 11 side and the second roller speed variable speed means 21 on the rear roller 19 side, respectively.
1 and the rear roller 19 are always synchronized.
And the second roller speed variable speed means 17, 21 are electrically controlled.

As described above, this control is applicable to various types of four-wheel drive vehicles, such as front-wheel drive vehicles, rear-wheel drive vehicles, and various types of four-wheel drive vehicles equipped with various mechanisms as shown in FIGS. 3A to 3D. Considering the case of a car,
For example, the other roller may be synchronized with the roller having a higher rotation speed, or the other roller speed variable speed means may be synchronized with the rotation speed of the artificially selected roller speed variable speed means. It's done in a way. Note that 24 is a speed indicator connected to the control device, while 25 is a speedometer of the vehicle under test 12.

In the above configuration, the vehicle to be tested 12 is placed and set on the front rollers 11 and rear rollers 19 of the testing machine Y as shown in FIG. However,
Suppose that the test vehicle 12 is a four-wheel drive vehicle (4WD) of the CD shown in FIG. When the torque ratio of the wheels is 60:40, the other variable speed motor 21 is automatically controlled by the control device 23 so as to be synchronized with the variable speed motor 17 having a higher rotation speed. Then, the speedometer 25 of the test vehicle 12 is, for example, 40 km/h.
If the speed indicator 24 of the tester displays this range at time h, the test is passed.

On the other hand, test vehicle 12 is a four-wheel drive vehicle (4WD)
Even if the vehicle is a front-wheel drive vehicle (FWD) or a rear-wheel drive vehicle (RWD), if the driver can select front-wheel drive or rear-wheel drive at his/her will, the inspector should The first or second roller speed variable speed means 17, 21 is selected. As a result, control is performed by the control device 23 so that the rotation speed of the selected variable speed motor is synchronized with the other variable speed motor.

"Effects of the present invention" As is clear from the above explanation, in the present invention, the front roller and/or rear roller are synchronized by a plurality of roller speed variable speed means controlled by a control device, so that the testing machine The overall structure is simplified, and therefore the testing machine is easy to install and does not require much installation space. Various types of four-wheel drive vehicles (4WD) equipped with various mechanisms as shown in A to Figure 3D
The front and rear rollers rotate synchronously, either automatically or simply by the inspector operating a switch on the control device. can be tested.

[Brief explanation of the drawing]

1 and 2 are schematic explanatory diagrams showing one embodiment of the present invention, and FIGS. 3A to 3D are explanatory diagrams showing various aspects of the drive system of a four-wheel drive vehicle (4WD), FIG. 4 is a schematic explanatory diagram showing a conventional embodiment. DESCRIPTION OF SYMBOLS 11...Front roller, 12...Test vehicle, 13...Front wheel, 17...First roller speed variable speed means, 18...First rotation speed detector, 19...
... Rear roller, 20 ... Rear wheel, 21 ... Second roller speed variable speed means, 22 ... Second rotation speed detector, 23 ... Control device, 24 ... Speedometer display.

Claims (1)

[Claims for Utility Model Registration] 1. In an automobile speedometer testing machine in which a front roller and a rear roller are synchronized, one end of the front roller and the rear roller is electrically controlled by a control device so that either one is synchronized with the other. A speedometer testing machine for an automobile, characterized in that roller speed variable speed means are respectively provided. 2. The automobile speedometer testing machine according to claim 1, wherein the roller speed variable speed means is a variable speed motor. 3. The speedometer testing machine for an automobile according to claim 1, wherein the roller speed variable means is a motor equipped with a continuously variable transmission.