JPH06201526A - Chassis dynamometer - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a chassis dynamometer that requires less maintenance and does not require warm-up operation. [Structure] A main shaft 2 provided in a dynamo main body 1 is supported by a bearing 7 through an inner bearing 4, an intermediate cylinder 5, and an outer bearing 6, and a drive shaft 10 is formed of a pipe and is provided on an outer peripheral portion of the main shaft 2. The drive shaft of the arranged drive motor 8 is coaxially connected to the intermediate cylinder 5, and the stator 11 of the drive motor 8 is provided with the bearing 7 via the casing 12.
Is stuck to. When the rollers 3 mounted on the main shaft 2 are rotated by the drive wheels of the automobile, the intermediate shaft 5 is directly rotated by the drive shaft 10 of the drive motor 8 in synchronization with the rotation of the main shaft 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chassis dynamometer used for carrying out performance tests of automobiles.

[0002]

2. Description of the Related Art A chassis dynamometer, for example, as disclosed in Japanese Utility Model Publication No. 63-26754, has a roller attached to a main shaft protruding from a main body of a dynamo equipped with a motor for driving an automobile to be tested. The wheels rotate the rollers. Then, in order to eliminate friction loss due to rotation of the main shaft, the main shaft is supported by a bearing via an inner bearing and an outer bearing. As a chassis dynamometer that supports the main shaft with this inner bearing and outer bearing,
For example, the ones shown in FIGS.

4 to 6, reference numeral 21 denotes a dynamo main body equipped with a motor (not shown), and a main shaft protruding on both sides thereof.
Rollers 23 and 23 are attached to 22,22. Reference numeral 24 denotes an inner bearing arranged on the outer periphery of the main shaft 22, and an outer bearing 26 is arranged on the outer periphery of the main shaft 22 via an intermediate cylinder 25. The main shaft 22 is supported by a bearing 27 via the inner bearing 24, the intermediate cylinder 25, and the outer bearing 26. Reference numeral 28 is a drive pipe coaxially connected to the end of the intermediate cylinder 25 in the axial direction, and a driven pulley 29 is attached to the outer periphery of the drive pipe. Reference numeral 30 denotes a drive motor fixed to the dynamo main body 21, and a timing belt 32 is stretched between the drive pulley 31 and the driven pulley 29, and the drive motor 30 intervenes through the timing belt 32 and the drive pipe 28 and the intermediate cylinder 25. Is configured to be rotatable. Reference numeral 32a is a spare belt (see FIG. 6) which is inserted in the main shaft 22 and is arranged in advance on the outer peripheral portion of the main shaft 22 for use when the timing belt 32 is cut.
The bearing 27 so that it does not hinder the rotation of the
Is separably attached to. Two spare belts 32a are generally arranged. 33 is a base on which the bearing
27 are erected. Reference numeral 34 is a rocking bearing attached to the base 33, and this rockingly supports the dynamo main body 21 by floating it hydraulically.

The chassis dynamometer includes rollers 23,
A drive wheel (not shown) of an automobile is placed on the top of 23, and the rotation of the drive wheel causes the rollers 23, 23 to rotate to detect the rotation of the main shaft 22 by the dynamo main body 21. Then, since the inner bearing 24 and the outer bearing 26 cause friction loss due to the rotation of the main shaft 22, in order to eliminate this friction loss, the timing belt 32 is driven by the drive motor 30 in accordance with the rotation of the main shaft 22. The intermediate pipe 25 is rotated by the drive pipe 28 via the driven pulley 31 in synchronization with the rotation of the main shaft 22. Therefore, it is possible to eliminate the friction loss of the inner bearing 24 due to the rotation of the main shaft 22, and it is possible to accurately detect the rotation of the drive wheel. Even if the intermediate cylinder 25 is rotated by the drive motor 30, the friction loss of the outer bearing 26 is not eliminated, but the friction loss of the outer bearing 26 only serves as a load on the drive motor 30, and the rotation of the main shaft 22 is reduced. Therefore, the friction loss of the outer bearing 26 can be ignored.

[0005]

The conventional chassis dynamometer described above has almost no obstacle to the performance test of the automobile. However, the drive pipe 28 and the intermediate pipe 25
Is rotated by the drive motor 30 via the timing belt 32, the timing belt 32 is cut and the drive motor 30
In some cases, it becomes impossible to transmit the rotational force of the above to the driven pulley 31. As described above, when the timing belt 32 is cut, it is necessary to replace the timing belt 32 with the spare belt 32a, and there is a problem that labor for replacing the timing belt 32 is required.

Even when the timing belt 32 is replaced, it is relatively easy to replace it when the spare belt 32a is present. However, when the spare belt 32a is lost, one or both of the rolls 23 and 23 can be correspondingly removed from the main shaft 22. Need to be separated. Therefore, when the timing belt 32 is replaced when the spare belt 32a is exhausted, for example, it takes about 10 times as long as the time required to use the spare belt 32a, which is considerably troublesome. There is a problem that becomes. Further, since the drive motor 30 rotates the intermediate pipe 25 together with the drive pipe 28 via the timing belt 32, in order to eliminate the friction loss of the inner bearing 24 by the rotation of the intermediate pipe 25 in the initial stage of the test, There is also a problem that it is necessary to perform warm-up operation in which the main shaft 22 is rotated by the motor provided in the dynamo main body 21, for example, for about 15 minutes.

The present invention is intended to solve the above problems, and an object thereof is to obtain a chassis dynamometer which is easy to maintain, requires less labor, and does not require warm-up operation. To do.

[0008]

In the chassis dynamometer of the present invention, a main shaft provided on a dynamo main body is provided with an inner bearing arranged on the outer periphery of the main shaft and an outer bearing arranged on the outer periphery of the inner bearing. In the chassis dynamometer supported by the main shaft with a roller attached thereto, a drive motor having a rotor drive shaft formed of a pipe is arranged on the outer peripheral portion of the main shaft, and the inner peripheral surface and the outer peripheral surface of the inner bearing are opposed to each other. The drive shaft is coaxially connected to an intermediate cylinder arranged between the surfaces, and the stator of the drive motor is attached to a fixing member such as the bearing.

As the drive motor, any motor whose rotation can be controlled can be used. For example, an AC inverter vector control motor, D
C motor can be mentioned. Fixing the stator of this drive motor to the bearing is suitable for simplifying its structure, but it is also possible to provide a dedicated fixing member and fix the stator to this fixing member. Is.
The drive shaft formed of the pipe and the intermediate cylinder disposed between the inner bearing and the outer bearing may be separately provided and connected or integrally formed.

[0010]

In the chassis dynamometer of the present invention, the drive wheel of the test vehicle is placed on the roller, and the main shaft is rotated via the roller by the rotation of the drive wheel.
A voltage is applied to the drive motor, and the drive shaft causes the intermediate cylinder to rotate synchronously with the main shaft to eliminate friction loss of the inner bearing. Since the drive shaft of the drive motor is formed of a pipe and arranged on the outer periphery of the main shaft, the drive shaft is coaxially connected to the intermediate cylinder, and the intermediate cylinder is directly rotated by the drive motor. By the cutting of the timing belt in the conventional example, there is no possibility that the intermediate cylinder cannot be rotated. Then, as described above, since the intermediate cylinder is directly rotated by the drive motor, it is possible to eliminate the friction loss of the inner bearing without performing the warm-up operation.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the chassis dynamometer of the present invention will be described with reference to FIGS. 1 to 3, 1 is a dynamo main body equipped with a motor (not shown), 2 and 2 are main shafts connected to the motor and projecting from both sides of the dynamo main body 1, and rollers 3 and 3 ( (See FIG. 2). An inner bearing 4 is arranged on the outer circumference of the main shaft 2, and an outer bearing 6 is arranged on the outer circumference thereof with an intermediate cylinder 5 interposed therebetween. The main shaft 2 is supported by the bearing 7 via the inner bearing 4, the intermediate cylinder 5, and the outer bearing 6.

Reference numeral 8 is a drive motor composed of an AC inverter vector control motor, and the main shaft 2 is inserted into a drive shaft 10 formed of a pipe which is inserted and fixed to a ring-shaped rotor 9 thereof.
The drive motor 8 is arranged on the outer peripheral portion of the main shaft 2, and the drive shaft 10 is coaxially connected to the intermediate cylinder 5. Reference numeral 11 is a stator of the drive motor 8, and a cylindrical casing 12 to which the stator 11 is fixed is attached to the side surface of the bearing 7.
That is, the intermediate cylinder 5 can be directly rotated by the drive shaft 10 of the drive motor 8. The rotor 9
The stator 11 and the stator 11 are each configured by winding a coil around an iron core. Reference numeral 13 is a ring-shaped gear attached to the outer peripheral surface of the drive shaft 10, and a rotation detector 14 made of a gear meshes with the gear, and the rotation detector 14 is fixed to a cover plate 15 attached to the casing 12. Thus, the rotation speed of the drive shaft 10 can be detected by the rotation detector 14.
16 is a base on which the bearings 7 and 7 are erected, and 17 is a base 16
The oscillating bearing is attached to the dynamometer body 1, which is hydraulically levitated to oscillate.

In this chassis dynamometer, drive wheels (not shown) of a test vehicle are placed on the rollers 3 and 3, and the main shaft 2 is rotated by the drive wheels via the rollers 3 and 3. On the other hand, a voltage is applied to the drive motor 8, the intermediate cylinder 5 is directly rotated by the drive shaft 10 of the rotor 9, and the rotation speed of the drive shaft 10 is detected by the rotation detector 14. 8 is controlled to synchronize the rotation of the intermediate cylinder 5 with the rotation of the main shaft 2 to eliminate the friction loss of the inner bearing 4.

As described above, the drive motor 8 in which the drive shaft 10 is formed of a pipe is arranged on the outer peripheral portion of the main shaft 2, and the drive shaft 10 is coaxially connected to the intermediate cylinder 5 so that the drive motor 8 The intermediate shaft 5 is directly rotated by the drive shaft 10. Therefore,
There is no risk that the rotation of the drive motor 8 cannot be transmitted to the intermediate cylinder 5 as in the case where the timing belt used in the conventional example is cut, and the intermediate cylinder 5 is always surely secured by the drive motor 8. The inner bearing 4 can be rotated to eliminate the friction loss, and the labor required for maintenance can be greatly reduced. Further, since the intermediate cylinder 5 is directly rotated by the drive motor 8, it is possible to eliminate the friction loss of the inner bearing 4 by rotating the intermediate cylinder 5 in synchronization with the rotation of the main shaft 2 from the initial stage of the test. No warm-up operation is required. Further, in the chassis dynamometer of this embodiment, since the drive motor 8 is composed of the AC inverter vector control motor in which no brush is used, it is possible to reduce the maintenance work required for the drive motor 8. .

In the above embodiment, the chassis dynamometer in which the dynamo body is arranged between the pair of rollers is shown. However, the configuration such as the positional relationship between the roller and the dynamo body in the chassis dynamometer is arbitrary. As disclosed in Japanese Patent Laid-Open No. 175036/1982, it is also possible to carry out a chassis dynamometer in which a pair of rollers are directly connected by a shaft and a dynamo body is arranged outside one of the rollers. Is.

[0016]

As described above, in the chassis dynamometer of the present invention, as described above, the main shaft provided on the dynamo main body and equipped with the rollers is supported by the bearing through the inner bearing and the outer bearing, and the drive shaft is the pipe. The drive shaft of the drive motor configured on the outer peripheral portion of the main shaft is coaxially connected to the intermediate cylinder of the inner bearing and the outer bearing, and the intermediate cylinder is directly rotated by the drive shaft of the drive motor. Configured to let. Therefore, unlike the cutting of the timing belt in the conventional example, there is no possibility that the rotational force of the drive motor cannot be transmitted to the intermediate cylinder, so that the labor required for maintenance is much larger than that in the conventional example. It is possible to reduce the amount to a minimum and maintenance is easy. Since the intermediate cylinder is directly rotated by the drive motor, it is possible to rotate the intermediate cylinder in synchronism with the rotation of the main shaft even in the initial stage of testing the automobile, thereby eliminating the friction loss of the inner bearing. Since the warm-up operation is unnecessary, it is possible to eliminate the time loss required for the warm-up operation.

[Brief description of drawings]

FIG. 1 is a sectional front view of a main part of an embodiment of the present invention.

FIG. 2 is a front view of the embodiment.

FIG. 3 is a sectional side view of a main part of the embodiment.

FIG. 4 is a sectional front view of a main part of a conventional example.

FIG. 5 is a front view of a conventional example.

FIG. 6 is a sectional side view of a main part of a conventional example.

[Explanation of symbols]

1: Dynamo body, 2: Spindle, 3: Roller, 4: Inner bearing, 5: Intermediate cylinder, 6: Outer bearing,
7: bearing, 8: drive motor, 9: rotor, 10: drive shaft,
11: Stator.

Claims (1)

[Claims] 1. A main shaft provided on a dynamo main body is supported by a bearing via an inner bearing arranged on the outer circumference of the main bearing and an outer bearing arranged on the outer circumference of the inner bearing, and a roller is mounted on the main spindle. In the chassis dynamometer, a drive motor in which the drive shaft of the rotor is formed of a pipe is arranged on the outer peripheral portion of the main shaft,
The drive shaft is coaxially coupled to an intermediate cylinder arranged between the peripheral surfaces of the inner bearing and the outer bearing facing each other, and the stator of the drive motor is attached to a fixing member such as the bearing. Chassis dynamometer.