JPH1019739A - Chassis dynamometer and drum moving mechanism therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chassis dynamometer which can vary a wheel base in a wide range. SOLUTION: In a chassis dynamometer, in which a drum 2 for rear wheels and a bevel gear box 6 are moved to adjust a shaft-to-shaft distance between front and rear wheel drums, the bevel gear box 6, a flywheel 4 and a DC motor 8 are directly connected in the order to be placed on a one-piece base 16 and are moved together to perform a wheelbase adjustment. This eliminates the need for a spline shaft traditionally required to make the length thereof the larger, the greater the changing range of the wheel base is thereby getting rid of trouble as caused by the vibration of the spline shaft.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chassis dynamometer for testing a four-wheel drive vehicle and its drum moving mechanism, and is particularly suitable for making the structure of the drum moving for wheel base adjustment simple and inexpensive. The present invention relates to a simple chassis dynamometer and its drum moving mechanism.

[0002]

2. Description of the Related Art Chassis dynamometers have the following features: automatic unmanned operation such as program operation is possible. High-speed tests always involve the driver's danger even on a complete equipment test course. There is no danger, and it is an indispensable device for vehicle tests such as a general test system, an exhaust gas test system, a noise test system, and a fuel test system.

As shown in FIG. 5, a chassis dynamometer is a device for performing a dynamic test by driving each drive wheel on front and rear wheel drums 1 and 2 to travel instead of a road. For this purpose, the anchor 2 is connected via the vehicle fixing devices 21a and 21b.
1 and 21, the test vehicle is fixed, and the air from the engine cooling fan 26 is supplied to the radiator by the tire cooling fan 2.
The wind from 8 is sent to the tires via the pit cover 27 to create an environment during actual running. Furthermore, in order to apply the same load to the drum as that traveling on an actual road, using a flywheel to give inertia corresponding to the vehicle weight, a DC motor to give running resistance,
Various measurements are made with good reproducibility in a state as close as possible to actual driving.

In such a chassis dynamometer, there is a difference in the wheel base depending on the type of vehicle. Therefore, the center distance between the front wheel drum 1 and the rear wheel drum 2 of the chassis dynamometer is matched with the wheel base L of the test vehicle 18. Need to adjust. A general drum moving device of a conventional chassis dynamometer for this purpose will be described with reference to FIGS. FIG. 6 is a plan view showing the configuration of the main part, and FIG. 7 is a sectional view of the moving device. In FIG. 6, the rear wheel drum 2 and the bevel gear box 6 connected thereto via the coupling 10 are provided with a drive motor 22.
Thereby, it is possible to move between the positions shown in FIGS.

When the test vehicle 18 is driven, the driving force from the drum 2 on which the rear wheel tires are mounted is transmitted via the coupling 10 and the like to the rear wheel bevel gear box 6 shown in FIG.
And transmitted to the bevel gear 6a which is engaged with the bevel gear 6a. The bevel gear 6b is keyed to the hollow shaft 25 in the bevel gear box 6, and a gear coupling 24a is connected to a shaft end protruding from the rear wheel bevel gear box 6 in the hollow shaft 25. Gear coupling 24
The gear coupling 24b on the other side of the shaft a is formed with a spline 23a of the connecting shaft 23 arranged coaxially with the hollow shaft 25.
And the drive force is transmitted to the connection shaft 23. One end of the connection shaft 23 extends toward the front wheel bevel gear box 5 through the inside of the rear wheel bevel gear box 6 and is supported by a pillow block 29 in a bearing. It is loosely fitted with a gap. The other end of the connection shaft 23 is connected to the flywheel 4 via a flange coupling fixed to the connection shaft. As shown in FIG. 3, a pair of bevel gears 5a and 5b are provided inside the front wheel bevel gear box 5. Note that the rear wheel bevel gear box 6 is installed on the rail 17 so that the rear wheel bevel gear box 6 slides on the rail 17 via a slide plate made of a sintered alloy when adjusting the wheel base L. Has become. Note that the parts common to the drum moving device of the chassis dynamometer according to the present invention shown in FIG. 1 will be described later in detail, and will not be described here.

The wheel base L is adjusted by the drive motor 22 for the drum moving device, the rear wheel bevel gear box 6, the hollow shaft 25, and the gear coupling 24 as described above.
a and 24b are integrally moved, in which case the gear coupling 24b slides on the spline 23a.

[0007]

The moving distance of the drum required for adjusting the wheel base L is generally 500 mm to 50 mm.
Although it is 00 mm, a chassis dynamometer for a large vehicle having a large center-to-axis distance reaches 5000 mm or more, and therefore requires a spline shaft that is long and has little vibration during rotation. was there.

An object of the present invention is to provide a chassis dynamo having a novel structure of a drum moving mechanism for adjusting a wheel base, eliminating a connecting shaft so as not to cause a problem of a critical speed even if the wheel base is largely changed. An object of the present invention is to provide a meter and its drum moving mechanism.

[0009]

SUMMARY OF THE INVENTION The present invention relates to a drum for a front wheel and a rear wheel used as a running surface of a test vehicle, and a bevel gear for a front wheel and a rear wheel to which a driving force of the drum is transmitted. A front wheel and a rear wheel flywheel directly coupled to each bevel gear box for compensating the inertia of the vehicle, and a front wheel for directly compensating the running resistance of the vehicle directly connected to each flywheel. And a drum moving mechanism of a chassis dynamometer having a motor for a rear wheel, wherein the bevel gear box corresponding to the moving drum, the flywheel coupled to the bevel gear box, and the motor are integrally formed on an integrated base. Disclosed is a drum moving mechanism that is configured to be placed and move the integrated base and the moving drum at the same time.

Further, the present invention discloses a chassis dynamometer having a drum moving mechanism.

[0011]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIGS. FIG. 1 is a plan view showing the overall configuration of a chassis dynamometer according to the present invention, and FIG.
FIG. 3 is a cross-sectional view showing the configuration of a front wheel bevel gear box, FIG. 4 is a view showing an example of a pinion rack to be used, and FIG. 5 is a view showing a test vehicle mounted on a drum. FIG. In the drawings, the same reference numerals as those in FIGS. 6, 7, and 8 denote parts having the same or the same functions.

In FIG. 1, reference numerals 1 and 2 denote a front wheel drum and a rear wheel drum which are running surfaces instead of roads, and drive wheels of a test vehicle 18 ride thereon. Front wheel tires of the test vehicle 18 are mounted on the front wheel drum 1, and rear wheel tires are mounted on the rear wheel drum 2, and their support shafts are supported by bearings in bearing housings 1b, 1b, 2b, 2b. A front wheel drum base 1a on which the front wheel drum 1 is mounted is fixed to a foundation, and a rear wheel drum base 2a on which the rear wheel drum 2 is mounted is movably mounted on a rail 17.

Front wheel drum 1 for driving test vehicle 18
Is transmitted to the front wheel bevel gear box 5 via the coupling 9. The power of the rear wheel drum 2 is transmitted to the rear wheel bevel gear box 6 via the coupling 10. Drums 1 and 2 of front and rear wheels and couplings 9 and 10
Between them, torque meters 19 and 20 are interposed. Each of the torque meters 19 and 20 measures the driving force of each of the drums 1 and 2 during the power transmission. Note that torque meters 14 and 15 are also attached to the shaft ends of the DC motors 7 and 8 for controlling the shaft ends.

As shown in FIG. 3, the front wheel bevel gear box 5 includes a pair of bevel gears 5a and 5b, and the shaft end of the bevel gear 5b is connected to a test vehicle 18 via a coupling.
The flywheel 3 is connected to a motor 7 for absorbing the power via a coupling. Similarly, as shown in FIG. 7, the rear wheel bevel gear box 6 includes a pair of bevel gears 6a and 6b, and the shaft end of the bevel gear 6b is a fly that compensates for the equivalent inertia of the test vehicle 18 via a coupling. The flywheel 4 is connected to a wheel 4 and is connected to an electric motor 8 for absorbing the power via a coupling.

The DC motors 7, 8 are load devices for setting the running resistance of the vehicle. The function of the flywheels 3 and 4 is to compensate for the equivalent inertia of the vehicle as described above. The equivalent inertia of the vehicle is the absorption of energy when accelerating and decelerating with inertia corresponding to the weight of the vehicle and the stored energy. Release of It is a combination of mechanical inertia and electric inertia. Mechanical inertia is inertial weight 50kg, 100kg ...
And 5 or 6 rotating disks.
Then, a disk having a necessary weight is selected according to the vehicle weight.

In the above configuration, after the adjustment of the wheel base described later is completed, the test vehicle 18 first enters, and the tires of the test vehicle 18 ride on the drums 1 and 2 of the front and rear wheels. When the vehicle enters the vehicle, the disc brakes 1c and 2c attached to the shaft ends of the drums 1 and 2 operate to prevent the drums 1 and 2 of the front and rear wheels from rotating. Then, as shown in FIG. 5, the front and rear of the test vehicle 18 are fixed to the anchor 21 via vehicle fixing devices 21a and 21b in order to prevent runaway. As a matter of course, during the test, the apparatus is interlocked so that the apparatus cannot be started while the disc brakes 1c and 2c are fixed. When the vehicle has been driven in this way, the engine of the vehicle is started and a test is performed. In the case of a two-wheel drive vehicle, only the drum corresponding to the drive wheel is unlocked, and the other drum remains locked.

Next, the adjustment of the wheel base will be specifically described. The rear wheel bevel gear box 6 and the flywheel 4 are connected by a coupling, and the flywheel 4 and the DC motor 8 are also connected by the coupling. This drive is mounted on an integral base 16 on a rail 17. Therefore, these three units move together on the integrated base 16.

By driving the motor 11 for driving the moving device shown in FIG. 4, the racks 12 provided at two positions on the side of the rear wheel drum base 2a and the racks 12 provided on the side of the rear wheel bevel gear box 6 are provided. Then, the pinion 13 is rotated synchronously, and the rear wheel drum base 2a and the integrated base 16 installed on each rail 17 are slidably moved by a desired stroke. For the movement, a slide plate made of a sintered alloy is interposed between each rail 17 so as to prevent galling during sliding. By this movement, the center of the front wheel drum 1 and the axis of the rear wheel drum 2 can be easily matched with the wheel base of the test vehicle 18. FIG. 1 shows a case where the rear wheel drum base 2a and the integrated base 16 are at both ends of the movable range, and the maximum value of the distance between the rear wheel drum and the front wheel drum is L 'and the minimum value is L. .

According to this configuration, the rear wheel bevel gear box 6, the flywheel 4, and the DC motor 8
Are directly coupled by a coupling and are mounted on the integrated base 16 and can be moved as a single body. Therefore, a long spline shaft as in the conventional case is unnecessary, and a wide range of changes in the wheel base can be easily performed. Response is possible. Also,
By making the moving unit an integral structure, the manufacturing cost can be reduced.

[0020]

According to the present invention, a self-propelled chassis dynamometer having a small minimum wheelbase and a large maximum wheelbase can be easily and inexpensively realized.

[Brief description of the drawings]

FIG. 1 is a plan view of a configuration example of a chassis dynamometer according to the present invention.

FIG. 2 is a II-II view of the chassis dynamometer shown in FIG.

FIG. 3 is a sectional view showing a configuration of a front wheel bevel gear box.

FIG. 4 is a diagram showing an example of a pinion rack to be used.

FIG. 5 is a diagram showing a state where a test vehicle is mounted on a drum.

FIG. 6 is a plan view showing a configuration of a main part of a conventional chassis dynamometer.

FIG. 7 is a cross-sectional view showing a configuration of a conventional mobile device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front wheel drum 1a Front wheel drum base 2 Rear wheel drum 2a Rear wheel drum base 1b, 1b, 2b, 2b Bearing housing 1c, 2c Disc brake 3, 4, Flywheel 5 Front wheel bevel gear box 5a, 5b Bevel gear in front wheel bevel gear box 6 Rear Wheel bevel gear box 6a, 6b Bevel gear in rear wheel bevel gear box 7, 8 DC motor 9, 10 Coupling 11 Motor for driving moving device 12 Rack 13 Pinion 14, 15 Torque meter 16 Integrated base 17 Rail 18 Test vehicle 19, 20 Torque Meter

Claims (2)

[Claims] 1. Drums for front wheels and rear wheels used as running surfaces of a test vehicle, bevel gear boxes for front wheels and rear wheels to which a driving force of each drum is transmitted, and A front wheel and a rear wheel flywheel which are directly coupled to compensate for the inertia of the vehicle; and a front wheel and rear wheel motor which is directly connected to each of the flywheels to compensate for the running resistance of the vehicle. A drum moving mechanism for the chassis dynamometer, wherein the bevel gear box corresponding to the drum to be moved, the flywheel coupled thereto and the electric motor are integrally mounted on an integrated base, and the integrated base is A drum moving mechanism configured to simultaneously move the moving drum. 2. A chassis dynamometer comprising the drum moving mechanism according to claim 1.