JP3279037B2 - Vehicle centering device for single roller type chassis dynamometer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single-roller type chassis dynamometer for exhaust gas testing, and more particularly to a vehicle centering device capable of easily adjusting the center of a tire to the center of a roller.

[0002]

2. Description of the Related Art In a conventional single-roller type chassis dynamometer, the center of a roller is made to coincide with the center of a tire in order to prevent torque generation due to an unbalanced load and improve measurement accuracy. FIG. 3 is a front view of a conventional single-roller type chassis dynamometer, and FIGS. 4 and 5 are a plan view and a longitudinal sectional front view of the vehicle centering device. In the figure, 1 is a pit cover,
Reference numerals 2 and 3 denote a pair of left and right front and rear rollers rotatably supported under the pit cover 1 such that the upper surface is substantially the same height as the pit cover 1.
3 is exposed from the hole 1a of the pit cover 1.
A dynamometer is connected to one of the rollers 2 and 3. Reference numeral 4 denotes a four-wheeled vehicle in which a front tire 5 and a rear tire 6 are mounted on rollers 2 and 3, a is the center of tires 5 and 6, and b is the center of rollers 2 and 3. Reference numeral 7 denotes a protrusion prevention roller provided on the pit cover 1 on the rear side of the rear tire 6, and reference numeral 8 denotes a steering wheel.

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

[0004]

However, the rear tire 6
If the diameter of the tires 6 is always the same, the center of the tires 5 and 6 can be made to coincide with the center of the rollers 2 and 3 by bringing the tire 6 into contact with the protrusion prevention roller 7. And the set position of the protrusion prevention roller 7 must be changed in accordance with this, and the working efficiency is extremely poor. Further, since the protrusion prevention roller 7 is fixed at the set position, fine adjustment after the tire 6 is mounted on the roller 3 is not easy. In addition, when the tire 6 came into contact with the protrusion prevention roller 7 during the test, deformation of the tire 6 and rotation loss of the protrusion prevention roller 7 occurred. Further, although there is a pair of left and right anti-protrusion rollers 7, when a person pushes the vehicle 4 or drives the vehicle 4 at a low speed and hits the tire 6 against the anti-protrusion roller 7, the vehicle 4 tilts in the left-right direction. Even the modification was difficult. Further, the tires 5 and 6 of the vehicle 4 are
Since the vehicle 4 cannot be lifted in the state of being placed on the top, it was not possible to perform the warm-up operation or the noise test by rotating only the chassis dynamometer.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and can perform centering of a tire easily and accurately, and can prevent contact with the tire during a test. It is another object of the present invention to provide a vehicle centering device in a single-roller type chassis dynamometer that can prevent the vehicle from tilting in the left-right direction and can push up a tire.

[0006]

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

[0007]

According to the present invention, the front and rear of the tire of the vehicle are pressed by the tire positioning bar and the tire pushing bar so that the center of the tire coincides with the center of the roller. or,
With the front side of the tire pressed by the tire positioning bar, the rear side of the tire is pushed up by the rotation of the tire push-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 sectional front view of a vehicle centering device in a single-roller type chassis dynamometer according to this embodiment. In the figure, reference numeral 9 denotes the direction in which the vehicle is carried onto the pit cover 1. Reference numeral 10 denotes a tire positioning bar provided on the pit cover 1 at the front side in the vehicle loading direction of the tire 6 so as to be movable in the front-rear direction. Reference numeral 11 is provided on the pit cover 1 at the rear side in the vehicle loading direction of the tire 6 so as to be rotatable in the horizontal direction. Tire push-up bar 12 is its axis of rotation. 13 is a guide for guiding the tire positioning bar 10 in the front-rear direction, 14 is a hydraulic cylinder for driving the tire positioning bar 10 in the front-rear direction, 15 is a hydraulic cylinder for rotating the tire lifting bar 11, and 16 is a tire lifting bar 11. Guides 17 for guiding the rotation of the hydraulic cylinder 1
It is a pit that houses 4,15.

Next, the operation of the above configuration will be described. First,
When the vehicle is carried in, the tire push-up bar 11 is in the way, so that it is rotated to the position indicated by the two-dot chain line. Here, vehicle 4
Is pressed by a person or the vehicle 4 is driven at a low 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 lifting bar 11. The hydraulic cylinders 14 and 15 for driving the bars 10 and 11 are controlled by a control unit according to the diameter of the tire 6.
The positions of 0 and 11 are automatically determined, and the center of the tire 6 is automatically and accurately coincident with the center of the roller 3 sandwiched between the bars 10 and 11, so that fine adjustment is not required.

After the centering is completed, the hydraulic cylinder 1
By operating the buttons 4 and 15, both the bars 10 and 11 are separated from the tire 6, and the test is started. Therefore, there is no possibility that the tire 6 and the bars 10 and 11 come into contact with each other at the time of the test and cause loss.
Further, since the above configuration is provided for each of the pair of left and right rollers 3, the pair of left and right bars 10, 1 is synchronized by operating the pair of left and right hydraulic cylinders 14, 15 in synchronization.
1 stops at the same position, and the vehicle 4 is not set diagonally in the left-right direction.

Further, when the front side of the tire 6 is pressed by the tire positioning bar at the same position as that at the time of centering, and the tire lifting bar 11 is turned by 90 ° or more, the pit cover 1
The tire lifting bar 11 enters between the tire and the tire 6, and lifts the tire 6. For this reason, the tire 6 and the roller 3 are separated, and the tire 5 and the roller 2 are the same. The test of the chassis dynamometer including the rollers 2 and 3 and the dynamometer can be performed independently of the vehicle 4, and the warming thereof can be performed. Machine operation and noise tests can be performed.

[0012]

As described above, according to the present invention, the front and rear of the tire are sandwiched between the tire positioning bar and the tire push-up bar, and the positions of the two bars are controlled according to the tire diameter. 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 right and left bars and driving means for the bars are provided, and the left and right members are operated in synchronism to prevent the vehicle from tilting in the left and right direction. Further, the front side of the tire is pressed by the tire positioning bar, and the rear side of the tire is pushed up by the tire push-up bar, whereby the tire can be separated from the rollers, so that the chassis dynamometer alone can be tested.

[Brief description of the drawings]

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

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

FIG. 3 is a front view of a conventional single-roller type 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]

 DESCRIPTION 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)

(57) [Claims] 1. A roller whose upper surface is substantially the same height as a pit cover and whose upper surface 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 type chassis dynamometer, a tire positioning bar is provided on the pit cover so as to be movable in the front-rear direction on the front side in the vehicle loading direction of the tire, and is freely rotatable horizontally on the pit cover in the rear side in the vehicle loading direction of the tire. A tire push-up bar provided on the vehicle, and a driving means for driving the tire positioning bar and the tire push-up bar, respectively, and when the vehicle is carried in, the front and rear of the tire are pressed by the tire positioning bar and the tire push-up bar so that the center of the tire is at the center of the roller. When lifting the tires, carry the tires to the vehicle. A vehicle centering device in a single-roller type chassis dynamometer, wherein a front side in the entry direction is pressed by a tire positioning bar and a rear side in a vehicle loading direction of the tire is pushed up by rotation of a tire push-up bar.