JP2009162672A - Chassis dynamometer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact chassis dynamometer simple in structure. <P>SOLUTION: The chassis dynamometer has a roller 11 whose shaft is rotatably supported through a bearing 121 by means of a bearing pillar 12, and a stator 14 whose shaft is rotatably supported through a bearing 131 by means of a bearing pillar 13, and the stator 14 is arranged inside the roller 11 like a bushing coaxially with the roller 11. On the outer peripheral side of the stator 14, motor coils 141 are wound, and on the inside wall side of the roller 11, permanent magnets 111 are installed. By a structure like this, the stator 14 and the roller 11 function as a motor which uses the roller 11 as an outer rotor. Meanwhile, the shaft of the stator 14 is coupled to a fixed pillar 15 through a shaft torque meter 16, and a shaft torque according to a force applied to the roller 11 by a drive wheel of a vehicle 2 to be tested, is detected with the torque meter 16. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a chassis dynamometer used for various tests of automobiles.

As a chassis dynamometer used in various tests of automobiles, an outer rotor type dynamo and a roller on a hollow cylinder are arranged coaxially so that the dynamo is located in the hollow portion of the roller, and the outer rotor of the roller and dynamo Are connected by a torque transmission member that also serves as a 6-component force measuring device, and a chassis dynamometer is known that measures the force acting between the wheels and rollers of an automobile using the 6-component force measuring device (for example, patents) Reference 1).
JP 2007-40835

  According to the technique described in Patent Document 1, the chassis dynamometer can be reduced in size. However, since the roller and the dynamo outer rotor are connected by the 6-component force measuring device, a relatively large 6-component force measuring device is provided. Further, the structure of the rotating system of the chassis dynamometer becomes complicated. From these facts, it is relatively difficult to manufacture a chassis dynamometer with high accuracy.

  Accordingly, an object of the present invention is to provide a chassis dynamometer that is small in size and simple in structure.

  In order to achieve the above object, the present invention provides a chassis dynamometer, a motor including a stator and an outer rotor that rotates with respect to the stator and also serves as a roller on which a vehicle wheel is placed. The shaft support portion is configured to support the shaft, and a shaft torque meter having one end fixed and the other end connected to the shaft of the stator.

  According to such a chassis dynamometer, the rotation system can be configured only by a motor including a stator and an outer rotor. Further, the force acting between the wheel and the roller of the automobile can be measured from the axial torque of the stator without using a large 6-component force measuring device.

  As described above, according to the present invention, a chassis dynamometer having a small size and a simple structure can be provided.

Hereinafter, an embodiment of the present invention will be described.
1a and 1b schematically show an application example of the chassis dynamometer according to the present embodiment.
FIG. 1a shows a case where a chassis dynamometer is applied to a motorcycle test, and FIG. 1b shows a case where a chassis dynamometer is applied to a four-wheel drive vehicle test.
As shown in the figure, the chassis dynamometer includes a dynamometer 1 provided for each drive wheel of the vehicle under test 2, and each dynamometer 1 is an upper surface of a pit 100 serving as a running surface of the vehicle under test 2. Is disposed in the pit 100 so that the zenith portion of the roller 11 is exposed in the opening provided in.
The test of the vehicle under test 2 using such a chassis dynamometer uses the fixing device 110 in a state where each drive wheel of the vehicle under test 2 is placed on the zenith portion of the roller 11 of each dynamometer 1. The vehicle under test 2 is fixed and the force acting between the drive wheel of the vehicle under test 2 and the peripheral surface of the roller 11 is measured while rotating the roller 11.

Next, the structure of the dynamometer 1 which concerns on this embodiment is shown in a figure.
Here, FIG. 2a shows the state of the dynamometer 1 viewed from the top, FIG. 2b shows the state of the dynamometer 1 viewed from the front, and FIG. 2c shows the state of the dynamometer 1 viewed along the section line AA of FIG. It is the figure which represented the internal structure typically.
As shown in the figure, the chassis dynamometer according to the present embodiment has a roller 11 that is supported by a bearing column 12 through a bearing 121 so that the shaft can rotate, and a shaft that rotates through a bearing 131 by the bearing column 13. The stator 14 is supported so as to be supported, and the stator 14 is disposed inside the roller 11 so as to be coaxial with the roller 11.

  A motor coil 141 is wound around the outer peripheral side of the stator 14, and a permanent magnet 111 is installed on the inner wall side of the roller 11. With this structure, the stator 14 and the roller 11 allow the roller 11 to move. By functioning as a motor serving as an outer rotor and driving the motor coil 141, torque in the rotational direction can be applied to the roller 11.

On the other hand, the shaft of the stator 14 is connected to the fixed column 15 via the shaft torque meter 16, and the shaft torque corresponding to the force applied to the roller 11 by the drive wheel of the vehicle 2 to be tested is the shaft torque meter 16. Is detected.
The shaft torque meter 16 is a strain gauge, for example, and detects the shaft torque acting between the fixed column 15 and the shaft of the stator 14 based on, for example, the amount of strain in the torsional direction of the shaft.
The embodiment of the present invention has been described above.
In the dynamometer 1 shown in FIG. 2, the motor coil 141 is wound around the outer periphery of the stator 14, and the permanent magnet 111 is installed on the inner wall side of the roller 11, but this sufficiently increases the inertial mass of the roller 11. If it can be made smaller, the permanent magnet 111 can be installed on the outer peripheral side of the stator 14, and the motor coil can be wound around the inner wall side of the roller 11.

  Further, in the dynamometer 1 shown in FIG. 2, each of the rollers 11 serving as the stator 14 and the outer rotor is supported so as to be rotatable only on one side in the axial direction. You may make it support rotatably by the bearing pillar 17 on both sides about a direction. Further, as shown in FIGS. 3 c and d, the shaft torque meter 16 may be provided on both sides of the stator 14. In addition, according to the structure shown to FIG. 3 b and d, the influence of the bearing loss of the stator 14 and the bearing loss of the roller 11 which also serves as an outer rotor can be canceled roughly.

It is a figure which shows the example of application of the chassis dynamometer which concerns on embodiment of this invention. It is a figure which shows the structure of the dynamometer which concerns on embodiment of this invention which concerns on embodiment of this invention. It is a figure which shows the other structural example of the dynamometer which concerns on embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Dynamometer, 2 ... Test vehicle, 11 ... Roller, 14 ... Stator, 16 ... Shaft torque meter, 100 ... Pit, 111 ... Permanent magnet, 141 ... Motor coil

Claims (1)

A motor composed of a stator and an outer rotor that rotates with respect to the stator and also serves as a roller on which a vehicle wheel is placed;
A shaft support portion that supports the shaft of the stator;
A chassis dynamometer comprising: a shaft torque meter having one end fixed and the other end connected to the shaft of the stator.