JPH07229816A - Centering system of vehicle in single roller chassis dynamometer - Google Patents

Abstract

PURPOSE:To obtain a centering system of vehicle in a single roller chassis dynamometer in which centering of vehicle can be performed easily and accurately while preventing inclination of vehicle or contact with a tire during test and in which the tire can be lifted. CONSTITUTION:A tire positioning bar 10 is disposed movably back and forth in front of a tire 6 set on a pit cover 1 and a tire push-up bar 11 is disposed rotatably on the rear side of the tire 6. At the time of centering, the tire 6 is held by means of both bars 10, 11 and at the time of lifting, the tire 6 is pushed up by means of the tire push-up bar 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle centering device for a single roller chassis dynamometer for exhaust gas testing, which is capable of easily aligning a tire center with a roller center.

[0002]

2. Description of the Related Art In a conventional single-roller chassis dynamometer, the center of a roller and the center of a tire are made to coincide with each other in order to prevent torque generation due to an eccentric load and improve measurement accuracy. FIG. 3 is a front view of a conventional single roller chassis dynamometer, and FIGS. 4 and 5 are a plan view and a vertical sectional front view of the vehicle centering device. In the figure, 1 is a pit cover,
Numerals 2 and 3 are a pair of left and right front and rear rollers rotatably supported below the pit cover 1 so that the upper surface thereof is at substantially the same height as the pit cover 1.
The upper surface of 3 is exposed from the hole 1a of the pit cover 1.
A dynamometer is connected to either one of the rollers 2 and 3. Reference numeral 4 denotes a four-wheel vehicle in which the front tire 5 and the rear tire 6 are placed on the rollers 2 and 3, a is the center of the tires 5 and 6, and b is the center of the rollers 2 and 3. Reference numeral 7 denotes a rear side of the rear tire 6, and a pop-out prevention roller provided on the pit cover 1, and 8 denotes a steering wheel.

In the above structure, the vehicle 4 mounted on the pit cover 1 is moved to bring the rear tire 6 into contact with the pop-out prevention roller 7 so that the centers of the rollers 2 and 3 coincide with the centers of the tires 5 and 6. Then, in this state, the vehicle 4 is driven to rotate the rollers 2 and 3 in accordance with the rotation of the tires 5 and 6.
The power of is absorbed by the dynamometer, and the running test of the vehicle 4 is performed.

[0004]

However, the rear tire 6
If the diameters of the tires 6 are always the same, the center of the tires 5, 6 can be made to coincide with the center of the rollers 2, 3 by contacting the tire 6 with the pop-out prevention roller 7. The setting position of the pop-out prevention roller 7 has to be changed accordingly, and the work efficiency is extremely poor. Further, since the pop-out prevention roller 7 is fixed at the set position, it is not easy to make fine adjustment after the tire 6 is placed on the roller 3. Further, when the tire 6 and the pop-out prevention roller 7 contacted each other during the test, deformation of the tire 6 and rotation loss of the pop-out prevention roller 7 occurred. Further, although there are a pair of left and right pop-out prevention rollers 7, when a person pushes the vehicle 4 or runs the vehicle 4 at a slow speed and hits the tire 6 against the pop-out prevention rollers 7, the vehicle 4 tilts in the left-right direction. It was difficult to fix. Further, the tires 5 and 6 of the vehicle 4 are connected to the rollers 2 and 3
Since the vehicle 4 cannot be lifted while it is placed on the vehicle, it was not possible to rotate only the chassis dynamometer to perform the warm-up operation and noise test.

The present invention has been made to solve the above-mentioned problems, and it is possible to center a tire easily and accurately, and to prevent contact with the tire during a test. Another object of the present invention is to obtain a vehicle centering device for a single-roller chassis dynamometer that can prevent the vehicle from leaning in the left-right direction and can also push up tires.

[0006]

A vehicle centering device in a single-roller chassis dynamometer according to the present invention is provided with a tire positioning bar on the front side in the vehicle loading direction of a tire on a pit cover so as to be movable in the front-rear direction. A tire pushing-up bar is rotatably provided on the rear side in the vehicle carrying-in direction, and a driving means for driving both bars is provided.

[0007]

In the present invention, the front and rear of the tire of the vehicle are pressed by the tire positioning bar and the tire push-up bar so that the center of the tire coincides with the center of the roller. or,
With the front side of the tire being pressed by the tire positioning bar, the rear side of the tire is pushed up by the rotation of the tire pushing up bar, and the tire is lifted.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a plan view and a vertical front view of a vehicle centering device in a single-roller chassis dynamometer according to this embodiment. In the figure, 9 indicates the direction in which the vehicle is loaded onto the pit cover 1. Reference numeral 10 denotes a tire positioning bar provided on the front side of the tire 6 in the vehicle loading direction on the pit cover 1 so as to be movable in the front-rear direction, and 11 is rotatably provided on the rear side of the tire 6 on the pit cover 1 in the vehicle loading direction. It is a tire push-up bar, 1
2 is the axis of rotation. 13 is a tire positioning bar 10
A guide for guiding the movement of the tire in the front-rear direction, 14 a hydraulic cylinder for driving the tire positioning bar 10 in the front-rear direction, 15
Is a hydraulic cylinder for rotating the tire push-up bar 11,
Reference numeral 16 is a guide for guiding the rotation of the tire push-up bar 11, 17 is guides 13, 16 and hydraulic cylinders 14, 1.
It is a pit that stores 5.

Next, the operation of the above configuration will be described. First,
When the vehicle is carried in, the tire push-up bar 11 interferes, so the tire push-up bar 11 is rotated to the position indicated by the chain double-dashed line. Where vehicle 4
A person pushes or the vehicle 4 is driven at a slight speed to put the tire 6 on the roller 3, the front side of the tire 6 is applied to the tire positioning bar 10, and the rear side of the tire 6 is pressed by the tire push-up bar 11. The hydraulic cylinders 14 and 15 that drive the bars 10 and 11 are controlled by the control unit according to the diameter of the tire 6, and the bars 1 and 15 according to the diameter of the tire 6.
The positions of 0 and 11 are automatically determined, and the center of the tire 6 that is sandwiched between the bars 10 and 11 automatically and accurately matches the center of the roller 3, and fine adjustment is unnecessary.

After the centering is completed, the hydraulic cylinder 1
Both bars 10 and 11 are separated from the tire 6 by the operations of 4 and 15, and the test is started. Therefore, the tire 6 and the bars 10 and 11 do not come into contact with each other during the test to cause a loss.
Further, since the above-described structure is provided for each of the pair of left and right rollers 3, the pair of left and right bars 10, 1 are operated by synchronizing the pair of left and right hydraulic cylinders 14, 15.
1 stops at the same position, and the vehicle 4 is not set diagonally in the left-right direction.

Furthermore, when the front side of the tire 6 is pressed by the tire positioning bar at the same position as during centering and the tire push-up bar 11 is rotated by 90 ° or more, the pit cover 1
The tire push-up bar 11 is inserted between the tire 6 and the tire 6 to lift the tire 6. Therefore, the tire 6 and the roller 3 are separated from each other, and the tire 5 and the roller 2 are also the same, so that the chassis dynamometer including the rollers 2 and 3 and the dynamometer can be tested independently of the vehicle 4, and the warming thereof can be performed. Can perform machine operation and noise tests.

[0012]

As described above, according to the present invention, the front and rear of the tire are sandwiched by the tire positioning bar and the tire push-up bar, and the positions of both bars are controlled according to the tire diameter. It can be done automatically and accurately. Further, since both bars are separated from the tire after the centering is completed, no contact loss occurs during the test. Further, a pair of left and right bars and driving means for the two bars are provided, and the left and right bars can be synchronously operated to prevent tilting of the vehicle in the left-right direction. Further, by pressing the front side of the tire with the tire positioning bar and pushing up the rear side of the tire with the tire push-up bar, the tire can be separated from the roller, and the chassis dynamometer alone can be tested.

[Brief description of drawings]

FIG. 1 is a plan view of a vehicle centering device according to the present invention.

FIG. 2 is a vertical sectional front view of the vehicle centering device according to the present invention.

FIG. 3 is a front view of a conventional single-roller chassis dynamometer.

FIG. 4 is a plan view of a conventional vehicle centering device.

FIG. 5 is a vertical sectional front view of a conventional vehicle centering device.

[Explanation of symbols]

 1 ... Pit cover 1a ... Hole 2,3 ... Roller 4 ... Vehicle 5,6 ... Tire 10 ... Tire positioning bar 11 ... Tire push-up bar 14, 15 ... Hydraulic cylinder

Claims (1)

[Claims] 1. A roller, the upper surface of which is substantially flush with the pit cover and the upper surface of which is exposed from the pit cover, is rotatably provided, a dynamometer is connected to the roller, and a vehicle tire is mounted on the roller. In the single-roller chassis dynamometer, the tire positioning bar is provided on the pit cover in front of the tire in the vehicle loading direction so as to be movable in the front-rear direction, and on the pit cover is rotatably provided on the rear side of the tire in the vehicle loading direction. The tire push-up bar and the driving means for driving the tire positioning bar and the tire push-up bar respectively are provided, and when the vehicle is loaded, the tire positioning bar and the tire push-up bar press the front and rear of the tire so that the center of the tire coincides with the center of the roller. At the same time, when lifting the tire A vehicle centering device in a single-roller chassis dynamometer, characterized in that a tire positioning bar presses the rear side of the tire in the vehicle loading direction and the rear side of the tire is pushed up by turning the tire pushing bar.