JPH0443801Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a chassis dynamometer for vehicle testing that drives and rotates both the front and rear wheels of a vehicle.

B. Summary of the invention This invention relates to a chassis dynamometer in which the support shafts of the rollers on which the front and rear wheels of a vehicle are mounted are connected by a connecting shaft via a bevel gear mechanism to drive both the front and rear wheels to rotate. The connecting shaft is formed by spline-coupling a pipe-shaped output shaft and a spline shaft slidably provided inside the output shaft, and the support shaft of the roller is connected to the output shaft via a bevel gear. At the same time, the end of the output shaft is rotatably supported by a bearing in the bevel gear mechanism main body, and the spline shaft is formed hollow, and a guide ring is attached to the shaft end, and this shaft end is placed inside the output shaft. They are constructed so that they fit together slidably to minimize vibrations that occur during operation, and at the same time, by forming the spline shaft hollow, the natural frequency of the spline shaft is increased to prevent resonance even during high-speed rotation. The purpose of this is to reduce vibration during operation and the accompanying noise, and to extend the life of the gear.

C. Problems to be solved by conventional technologies and ideas A chassis dynamometer, which aims to conduct vehicle running tests more accurately, is a system in which rollers on which the front and rear wheels of a vehicle are mounted are connected by a connecting shaft and rotated together. There is a wheel drive type chassis dynamometer.
However, in this case as well, the chassis dynamometer is required to have a variable spacing between the rollers so that it can be used for any size vehicle under test.

Therefore, the connecting shaft must be perpendicular to the roller support shaft and must be movable in the axial direction, and conventional bevel gear mechanisms that have such a mechanism have been designed to avoid vibrations and vibrations during operation. Noise caused by vibrations is transmitted to the vehicle through the rollers or input into the measuring equipment, interfering with accurate measurements, and furthermore, the connecting shaft may cause resonance in the high rotation range.
There was a problem in that it was not possible to collect driving data of vehicles at high speeds, which is particularly required these days.

D Means for Solving the Problems Therefore, in the present invention, the support shafts of the respective rollers on which the front and rear wheels of the vehicle are mounted are connected by a connecting shaft via a bevel gear mechanism, and at least one of the support shafts is connected to the connecting shaft. In the bevel gear mechanism on the movable side that is movable relative to the rotating shaft on the movable side, the connecting shaft is composed of a hollow output shaft and a spline shaft that is slidably spline-coupled to the inside of the output shaft. In the chassis dynamometer in which the wheels are driven to rotate together and the spacing between the rollers is adapted to the distance between the axles of the vehicle, the support shaft is connected to the output shaft of the bevel gear mechanism on the movable side via a bevel gear. When engaged, the end of the output shaft is rotatably supported by the bevel gear mechanism main body with a bearing, and the spline shaft is formed hollow, and the shaft end of the spline shaft is slidable inside the output shaft. A chassis dynamometer was constructed by attaching a guide ring that could be fitted freely.

E. Embodiment An embodiment of the chassis dynamometer according to the present invention is shown in FIGS. 2 and 3. Chassis dynamometer 2 (hereinafter referred to as "CHDY2") shown in the same figure.
The first roller 4, the second roller 6, and the first support stand 8 and second support stand 1 that rotatably support these rollers.
0, and a dynamo 12 connected to the first roller 4 and the second roller 6. The vehicle under test (not shown) has its front wheels placed on the second roller 6, its rear wheels placed on the first roller 4, and is fixed to the CHDY 2 by a fixing device (not shown). Reference numeral 13 denotes a blower that blows air from the front of the fixed vehicle under test.

The second support stand 10 is fixed to the floor 15, while the first support stand 8 is connected to the first roller 4 and the second support stand 10.
It is movable relative to the floor surface 8 so that the distance from the roller 6 can be adjusted to the distance between the axles of the vehicle under test. The driving means may be constructed such that a feed screw is engaged with the first support base 8 and moved by the rotational movement of the feed screw, or a hydraulic device, a chain, etc. is connected to operate the feed screw. . A first support shaft 14 and a second support shaft 16 that rotatably support the first roller 4 and the second roller 6 are integrally fixed to the first roller 4 and the second roller 6, and their shaft ends are connected to the first and second rollers, respectively. It is connected to the bevel gear mechanism 18 and the second bevel gear mechanism 20. These first support shaft 14 and second support shaft 16 are connected by a connecting shaft 22 via a first bevel gear mechanism 18 and a second bevel gear mechanism 20, and are further connected to the dynamo 12 via this connecting shaft 22. ing.

Next, the first bevel gear mechanism 18 which is the movable side
The configuration will be explained based on FIG.

The connecting shaft 22 consists of a cylindrical output shaft 30 and a spline shaft 32, and a spline formed on the outer peripheral surface of the spline shaft 32 is connected to the inner periphery of a coupling member 34 that is integrally fixed to the right end of the output shaft 30 in the figure. The spline shaft 3 engages with the spline groove formed on the surface.
2 is coupled to the output shaft 30 so as to be slidable and rotate integrally with the output shaft 30 in the rotational direction. With the connecting shaft 22 in this state, the bearing 38 is attached to the main body 36.
and 40, and is further rotatably supported by a bearing 44 attached to an extension portion 42 extending leftward in the figure from the main body 36. The output shaft 30
A bevel gear 46 is integrally fixed inside the main body 36 by keying or the like, and meshes with a bevel gear 48 integrally fixed to the shaft end of the first support shaft 14. The first support shaft 14 is rotatably supported by a bearing 50 on the main body 36 so as to be perpendicular to the connection shaft 22 .

Further, the spline shaft 32 is formed hollow, and a stepped portion is formed at the inner shaft end of the output shaft 30, and the outer diameter is tapered one step, and a guide ring 52 is fitted into the stepped portion. There is. This guide ring 52 is fitted onto the stepped portion of the spline shaft 32, and its outer periphery is connected to the output shaft 3.
There is no play in the inner surface of the 0, and it is inscribed in a slidable manner.

On the other hand, the second bevel gear mechanism 20 provided on the second support shaft 16 is configured such that the second support base 10 is connected to the connecting shaft 22
Since the position of the second support shaft 16 does not change relative to the connecting shaft 22, a bevel gear (not shown) is attached to the connecting shaft 22 and a bevel gear (not shown) is provided on the second support shaft 16 so as to mesh with the bevel gear, thereby connecting the second support shaft 16 and the connecting shaft 22.

Next, the overall operation of CHDY2 mentioned above will be described.

Fix the vehicle under test on CHDY2, start the engine, and drive the rear or front wheels, or all four wheels if it is a four-wheel drive vehicle. For example, in the case of a rear wheel drive vehicle, the rotation of the driving wheels is transmitted from the first support shaft 14 to the connecting shaft 22 via the first bevel gear mechanism 18, which drives the dynamo 12 and is transmitted to the connecting shaft 22 by the second bevel gear mechanism 20. 2 support shaft 16 to move the second roller 6 to the first roller 4.
Rotate with the same rotation as. The front and rear wheels of the vehicle under test are rotated at the same rotation rate in this manner, even if the vehicle under test is a front-wheel drive vehicle or a four-wheel drive vehicle. And a blower 1 installed in front of the vehicle
From No. 3, wind at a speed commensurate with the vehicle running speed or cooling wind is sent.

In this state, in the first bevel gear mechanism 18, the rotation of the first support shaft 14 is controlled by the bevel gears 48 and 4.
6 to the output shaft 30, and this output shaft 30
is transmitted to the spline shaft 32 via the engagement member 34. At this time, since the shaft end is supported by a bearing 44 provided at the left end of the output shaft 30 main body 36 in the figure, there is very little deflection against the main body 36, and vibrations during rotation can be suppressed as much as possible.
Moreover, since a guide ring 52 is provided at the shaft end of the spline shaft 32, which fits exactly on the inner surface of the output shaft 30, the looseness of the spline shaft 32 with respect to the output shaft 30 is eliminated, and here as well, vibrations caused during rotation are eliminated. can be suppressed as much as possible.

Therefore, it is possible to reduce the rotation of the first support shaft 14, the connecting shaft 22, etc. and the generation of vibration and noise in the first bevel gear mechanism 18 during the inspection of the vehicle to be inspected. Furthermore, since the spline shaft 32 is formed hollow, it is possible to increase the natural frequency of the spline shaft 32, and a high-speed running experiment was conducted in CHDY2, and it was found that even when the first roller 4, etc. rotated at high speed, resonance occurred in the connecting shaft 22. It is possible to perform stable and high-speed experiments without any problems.

Furthermore, in this embodiment, the dynamo 12 is provided on a straight line connecting the first bevel gear mechanism 18 and the second bevel gear mechanism 20, and the dynamo 12 is arranged side by side with the blower 13, so that the CHDY 2 does not take up much space when installed. can be used effectively.

F. Effect of the invention The effect of the invention is that vibration and noise can be greatly reduced in an all-wheel drive chassis dynamometer in which rollers for the front and rear wheels are connected by a connecting shaft; It is possible to perform accurate vehicle tests without any problems. Furthermore, since the spline shaft is hollow, it is possible to increase the natural frequency of the spline shaft, so it does not resonate even at high speed rotations, making it possible to conduct tests that take into account the high speed running of the vehicle without causing shaft resonance. I can do it.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the bevel gear mechanism according to the present invention, FIG. 2 is a plan view showing one embodiment of the chassis dynamometer according to the present invention, and FIG.
The figure is a side partial sectional view of FIG. 2. In the drawing, 2 is a palm dynamometer, and 4 is a first
14 is a first support shaft, 18 is a first bevel gear mechanism, 22 is a connecting shaft, 30 is an output shaft, 32 is a spline shaft, 36 is a main body, 44 is a bearing, 5
2 is a guide ring.

Claims (1)

[Scope of utility model registration request] The support shafts of the respective rollers on which the front and rear wheels of the vehicle are mounted are connected by a connection shaft via a bevel gear mechanism, and at least one of the support shafts is movable with respect to the connection shaft, and the support shaft is attached to the movable side support shaft. In the bevel gear mechanism on the movable side, the connecting shaft is composed of a hollow output shaft and a spline shaft that is slidably splined to the inside of the output shaft, and the front and rear wheels are both rotated and the distance between the rollers is adjusted to the width of the vehicle. In a chassis dynamometer that can be moved to match the distance between axles,
The support shaft is engaged with the output shaft of the movable bevel gear mechanism via a bevel gear, and the end of the output shaft is rotatably supported by a bearing in the bevel gear mechanism main body, and the spline shaft is 1. A chassis dynamometer characterized in that the spline shaft is formed hollow and has a guide ring attached to the shaft end of the spline shaft to be slidably fitted inside the output shaft.