JP2005148029A - Chassis dynamometer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain a lower inertia and an improvement in responsiveness and prevent resonance frequency by shaft twisting by simplifying the structure. <P>SOLUTION: The dynamometer comprises a rotator 20 having a shaft part 21 in the center, a roller part 22 for placing a drive wheel of a vehicle to be tested on the circumference, and a field magnet 24 provided on the inner circumference of the roller part 22; a support part 25 for rotatably supporting the shaft part 21; and a stator 31 fixed to the support part 25 oppositely to the field magnet 24 in the radial direction to pass a magnetic flux in the radial direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a chassis dynamometer, and more particularly to the dynamometer.

  In general, chassis dynamometers are used to perform static and dynamic driving performance tests of automobiles indoors. Instead of roads, rotating rollers are used as infinite flat roads, and automobile driving wheels are placed on the rollers. Drive the car and transmit the power generated by the car to the rollers. Further, the power generated by the automobile is measured by absorbing the power generated by the automobile with a load device such as a dynamometer. Furthermore, in dynamic tests such as various acceleration tests and exhaust gas mode tests, the resistance (running resistance) that the automobile receives on the road can be reproduced with a chassis dynamometer.

  The basic configuration of the chassis dynamometer as described above will be described with reference to FIG. In the figure, a roller 3 is connected to a dynamometer 1 via a torque meter 2, and a drive wheel 4a of a vehicle under test 4 is placed on the roller 3 (the direction of the vehicle under test 4 is rotated 90 degrees). Shown). In addition, a vehicle body fixing device, an engine cooling fan, a tire cooling fan, a pit cover, and the like are provided as necessary.

FIG. 6 shows a half longitudinal front view of a conventional chassis dynamometer described in Patent Document 1. A pair of left and right bearing bases 7 are provided on a bed 6 installed on the foundation 5. Both end portions of the moving shaft 8 are rotatably supported via a rocking bearing 9. A torque detection arm 10 is provided at one end of the swing shaft 8 so as to protrude in the horizontal direction, and the torque detection arm 10 and the bed 6 are connected by a load cell 11 that detects the magnitude of torque applied to the swing shaft 8. Has been. Further, end plates 13 of a cylindrical roller frame 12 are rotatably supported at both ends of the swing shaft 8 through bearings 14, and driving wheels of the vehicle under test are disposed at both ends of the outer periphery of the roller frame 12. A pair of rollers 15 on which is mounted is attached via bolts 16 and the like. A rotor 17 is attached to the inner periphery of the central portion of the roller frame 12 via a bracket 18, and a stator 19 facing the rotor 17 is attached to the swing shaft 8.
Japanese Patent Publication No. 3-77741

  Since the conventional chassis dynamometer shown in FIG. 5 has a structure in which the separate dynamometer 1 and the roller 3 are connected to each other by a shaft, the structure is complicated, and the structure becomes heavier by the amount of the roller 3 and it is difficult to reduce the inertia. As a result, the responsiveness decreased. Further, shaft torsion occurs between the dynamometer 1 and the roller 3, and vibration due to resonance may occur. In addition, the conventional chassis dynamometer shown in FIG. 6 has a structure in which a roller 15 is attached to the outer periphery of the dynamometer on the rotor 17 side. In addition, the swing shaft 8 is a separate body, and the structure is still complicated, making it difficult to reduce the inertia. Furthermore, in the conventional chassis dynamometer, an encoder or the like is required to control the rotation speed of the rollers 3 and 15, and the structure becomes complicated.

  The present invention has been made to solve the above-described problems. The structure is simplified, the inertia is reduced, the response is improved, the shaft is not twisted, and an encoder is not required. The object is to obtain a chassis dynamometer that can be used.

  A chassis dynamometer according to a first aspect of the present invention is a chassis dynamometer provided with a dynamometer that absorbs the power of a vehicle under test. And a rotor having a field magnet on the inner periphery of the roller part, a support part that rotatably supports the shaft part, and a support part that is fixed to face the field magnet. And a stator through which the magnetic flux passes in the radial direction.

  A chassis dynamometer according to claim 2 is a chassis dynamometer provided with a dynamometer that absorbs the power of the vehicle under test. A rotor having a field magnet inside the connecting portion between the shaft portion and the roller portion, a support portion for rotatably supporting the shaft portion, and a field magnet facing the support portion. The stator is fixed and the magnetic flux passes in the axial direction.

  The chassis dynamometer according to claim 3 is provided with an auxiliary roller that receives the load in the vertical direction of the roller portion.

  As described above, according to the first and second aspects of the present invention, the shaft connecting the dynamometer and the roller is unnecessary, and the roller constitutes a part of the rotor, so that the structure is simplified and the inertia is reduced. And responsiveness can be improved. In addition, since there is no connecting shaft, shaft torsion does not occur and generation of vibration due to resonance can be prevented.

  According to the third aspect, the auxiliary roller that receives the load in the vertical direction of the roller portion is provided, the load received by the shaft portion can be reduced, and damage to the shaft portion and its bearing portion can be prevented. Other effects similar to those of the first and second embodiments can be obtained.

Best Embodiment 1
The best mode for carrying out the present invention will be described below with reference to the drawings. 1 (a) and 1 (b) show a half longitudinal front view and a side view of a chassis dynamometer according to Embodiment 1 of the present invention. Reference numeral 20 denotes a rotor having a shaft portion 21 in the center and an outer periphery. It has a cylindrical roller portion 22 on which the driving wheel of the vehicle under test is placed, and the shaft portion 21 and the roller portion 22 are connected by a connecting portion 23. A field magnet 24 is provided on the inner periphery of the roller portion 22. Reference numeral 25 denotes a support portion that rotatably supports the shaft portion 21 via bearings 26 and 27, and the support portion 25 is erected on the base 28. A stator core 29 is provided on the outer periphery of the support portion 25 so as to face the field magnet 24 in the radial direction. A stator coil 30 is wound around the stator core 29, and the stator core 29 and the stator are wound around the stator core 29. A stator 31 is formed by the coil 30.

  In the above configuration, the stator core 29 is excited by the stator coil 30 to generate a magnetic flux in the radial direction, thereby generating a magnetic force with the field magnet 24, thereby rotating the rotor 20. On the other hand, the rotor 20 is rotated by driving the drive wheel of the vehicle under test placed on the roller portion 22, thereby absorbing the power of the vehicle under test.

  In the first embodiment, a shaft for connecting the dynamometer and the roller is not necessary, and the roller constitutes a part of the rotor, the structure is simplified, the inertia can be reduced, and the responsiveness is improved. Can be improved. Further, since there is no connecting shaft, shaft torsion does not occur and generation of vibration due to resonance can be prevented.

Embodiment 2
2 (a) and 2 (b) show a half longitudinal front view and a side view of the chassis dynamometer according to the second embodiment, 32 is a rotor, and has a shaft portion 21 in the center and a vehicle under test on the outer periphery. The cylindrical roller portion 22 on which the drive wheels are mounted is connected, and the shaft portion 21 and the roller portion 22 are connected by a connecting portion 23. A field magnet 24 is provided on the inner periphery of the connecting portion 23. The shaft portion 21 is rotatably supported by the support portion 25 via bearings 26 and 27, and the support portion 25 is erected on the base 28. A stator core 33 is provided on the outer periphery of the support portion 25 so as to face the field magnet 24 in the axial direction. A stator coil 34 is wound around the stator core 33, and the stator core 33 and the stator coil are wound around the stator core 33. 34 forms a stator 35.

  In the above configuration, the stator core 33 is excited by the stator coil 34 to generate a magnetic flux in the axial direction, thereby generating a magnetic force with the field magnet 24, thereby rotating the rotor 32. On the other hand, the rotor 32 is rotated by driving the drive wheels of the vehicle under test placed on the roller section 22, thereby absorbing the power of the vehicle under test.

  In the second embodiment as well, the shaft connecting the dynamometer and the roller is not necessary, and the roller forms a part of the rotor, the structure is simplified, the inertia can be reduced, and the response is improved. can do. Since there is no connecting shaft, shaft torsion does not occur and generation of vibration due to resonance can be prevented.

Embodiment 3
FIGS. 3A and 3B show a half-longitudinal front view and a side view of the chassis dynamometer according to the third embodiment, and 36 and 37 are provided with the rotation shafts 36a and 37a on the support portion 25 and the base 28, respectively. An auxiliary roller that is rotatably supported by the supported portion 38, is in contact with the roller portion 22, and receives a load in the vertical direction. Other configurations are the same as those in the second embodiment.

  In the first and second embodiments, the space occupied by the bearing portion is smaller than that of the prior art. Since the driving wheel of the vehicle under test is placed on the roller portion 22, the load received by the shaft portion 21 increases, and the shaft portion 21 and its bearing portion are likely to be damaged. For this reason, auxiliary rollers 36 and 37 that receive the load in the vertical direction of the roller portion 22 are provided to reduce the load received by the shaft portion 21. Thereby, the damage in the shaft part 21 and its bearing part can be prevented. In addition, the same effects as those of the first and second embodiments are obtained.

1 is a half longitudinal front view and side view of a chassis dynamometer according to Embodiment 1 of the present invention; It is the half longitudinal front view and side view of the chassis dynamometer by Embodiment 2. FIG. It is the half vertical front view and side view of the chassis dynamometer by Embodiment 3. FIG. It is a block diagram of the conventional chassis dynamometer. It is a half vertical front view of the conventional chassis dynamometer described in Patent Document 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 20,32 ... Rotor 21 ... Shaft part 22 ... Roller part 23 ... Connection part 24 ... Field magnet 25, 38 ... Support part 26, 27 ... Bearing 28 ... Base 29, 33 ... Stator core 30, 34 ... Stator Coil 31, 35 ... Stator 36, 37 ... Auxiliary roller

Claims (3)

A chassis dynamometer equipped with a dynamometer that absorbs the power of the vehicle under test has a shaft portion at the center, and has a roller portion on which the driving wheel of the vehicle under test is placed on the outer periphery. A rotor having a field magnet around the periphery, a support portion that rotatably supports the shaft portion, and a stator that is fixed to the support portion so as to face the field magnet and through which the magnetic flux passes in the radial direction. A chassis dynamometer characterized by A chassis dynamometer having a dynamometer that absorbs power of a vehicle under test has a shaft portion at the center and a roller portion on the outer periphery of which a drive wheel of the vehicle under test is mounted, and the shaft portion and the roller A rotor having a field magnet on the inner side of the connecting portion, a support portion that rotatably supports the shaft portion, and a fixing that is fixed to the support portion so as to face the field magnet, and the magnetic flux passes in the axial direction. A chassis dynamometer characterized by comprising a child. The chassis dynamometer according to claim 1 or 2, further comprising an auxiliary roller for receiving a load in a vertical direction of the roller portion.

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