JP3414034B2 - Torque meter device for brake dynamometer - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torque meter device used for a brake dynamometer for performing a brake test on an automobile, a railroad vehicle and the like. FIG. 2 is a front view of a conventional brake dynamometer, 1 is a DC motor, 2 is a flywheel connected to a DC motor 1, and 3 is a flywheel via a vehicle brake 4. The torque meter device 5 connected to 2 is a slip ring for taking out a temperature signal and a distortion signal by coming into contact with the rotating side. In such a configuration, when the DC motor 1 is rotated, the flywheel 2 is also rotated. When the brake 4 is operated, the brake torque is measured by the torque meter device 3 and the brake temperature and the like are also measured.
Is measured via FIGS. 3 and 4 show a side view and a front view, respectively, of the torque meter device 3. Reference numeral 6 denotes a swing shaft which is swingably supported by bearing stands 7, 8 provided on a support 13. ,
The swing shaft 6 is connected to the brake 4 via a coupling 9. Reference numeral 10 denotes a torque arm projecting from both sides of the swing shaft 6, and reference numerals 11 and 12 denote load cells mounted on a support 13 at both ends of the torque arm 10. The brake torque at the time of operation of the brake 4 is applied to the load cells 11, 1 via the coupling 9, the swing shaft 6, and the torque arm 10.
2 and is detected by the load cells 11 and 12. In the torque meter device 3, when measuring a large braking force, that is, a large braking torque, the swing shaft 6, the torque arm 10, and the load cells 11, 12 are also large. I had to make it. On the other hand, in the case of the brake 4, even when the brake 4 is not operated, the brake mechanism may not completely return from the operating state and may be dragged, so that it is necessary to measure the drag torque to detect the state of the brake 4. . However, since the drag torque is a small value, it was not possible to measure the load cells 11 and 12 with a large size with high accuracy. Therefore, load cell 1
It was necessary to replace 1,12 with a small one, which required time and labor. Further, in the bearing stands 7 and 8, a rolling bearing is used as the bearing of the swing shaft 6, and the swing resistance is increased, so that the drag torque cannot be measured accurately. SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a torque for a brake dynamometer capable of easily and accurately measuring a large torque and a small torque such as a drag torque. It is intended to obtain a meter device. A torque meter device for a brake dynamometer according to the present invention has one end detachably connected to a flywheel shaft via a brake and the other end connected to a fixed portion. An inner oscillating shaft having a torque meter detachably connected between the inner oscillating shaft and an inner hydrostatic bearing formed in a cylindrical shape and supporting the inner oscillating shaft in an oscillating manner, and an inner oscillating shaft. An outer oscillating shaft detachably connected to the outer oscillating shaft, an outer hydrostatic bearing supported by the support portion and oscillatingly supporting the outer oscillating shaft, and a torque arm having one end attached to the outer oscillating shaft. A load cell is provided between the other end of the torque arm and the fixed portion. In the present invention, at the time of a brake drag test, the inner rocking shaft is connected to the torque meter, is supported by the inner static pressure bearing having a small rocking resistance, and the drag torque is measured by the torque meter. You. Also, during the steady test of the brake, the inner rocking shaft and the outer rocking shaft are connected, the outer rocking shaft is supported by an outer hydrostatic bearing having a small rocking resistance, and the steady torque is attached to the outer rocking shaft. It is measured by the torque arm and the load cell. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional front view of a torque meter device for a brake dynamometer according to this embodiment. Reference numeral 14 denotes an inner swing shaft, one end of which is connected to a flywheel shaft 2a via a brake 4 and the other end thereof. Is coupling 1
5 is connected to one end of the torque meter 16. The other end of the torque meter 16 is connected to a fixed portion 17 on the support 13. The torque meter 16 measures a torque of 0.1 kg · m or less. Reference numeral 18 denotes a cylindrical outer swing shaft, on the inside of which an inner static pressure bearing 19 using hydraulic pressure for swingably supporting the inner swing shaft 14 is fixed, and the outer swing shaft 18 has an inner swing shaft. It is detachably connected to the driving shaft 14 via a coupling 20. Reference numeral 21 denotes an outer hydrostatic bearing using hydraulic pressure,
The outer swing shaft 18 is attached to a support portion 22 on the support base 13 so as to swing freely. The torque arm 10 is provided so as to protrude in the horizontal direction from the outer swinging shaft 18, and has a load cell 11, 1 at a tip end thereof at a fixed portion on the support base 13.
2 are provided. Load cells 11 and 12 are 300k
Measure the torque of g · m or less. In the above configuration, the inner swing shaft 14 and the outer swing shaft 18 are integrally connected by the coupling 20 during the steady test of the brake 4. In this state, the DC motor 1
When the brake 4 is actuated, the rotation of the motor 1 is transmitted to the outer swing shaft 18 via the flywheel 2, the brake 4, the inner swing shaft 14 and the coupling 20,
Normal brake torque is measured by the load cells 11 and 12 via the torque arm 10. On the other hand, when the drag torque of the brake 4 is measured, the inner swing shaft 14 is connected to the torque meter 16 via the coupling 15. In this state, the rotation of the motor 1 is transmitted to the inner swing shaft 14 through the flywheel 2 and the brake 4 in the drag state, and the drag torque is measured by the torque meter 16. In the above embodiment, a small torque such as a drag torque is measured by the torque meter 16 via the inner swing shaft 14, and the torque arm 10, the load cells 11, 12 and the relatively large outer swing shaft are measured. Since the inner oscillating shaft 14 is supported by the inner hydrostatic bearing 19 having a small oscillating resistance, the drag torque can be accurately measured. Also, coupling 15
When the coupling 20 is connected and the coupling 20 is connected, the outer oscillating shaft 18 is also supported by the outer hydrostatic bearing 21 with a small oscillating resistance, so that a normal large torque can be measured with high accuracy. it can. Further, the connection switching as described above can be easily performed by the couplings 15 and 20. If an electromagnetic clutch is used instead of the couplings 15 and 20, the connection can be switched more easily. As described above, according to the present invention, when measuring the drag torque of the brake, a large swing shaft, a torque arm and a load cell are not used, and a small swing shaft and a torque meter are used. The swing shaft is supported by a hydrostatic bearing having a small swing resistance, and a small torque such as a drag torque can be accurately measured.
Further, the conversion between the steady torque of the brake and the drag torque can be easily performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional front view of a torque meter device for a brake dynamometer according to an embodiment of the present invention. FIG. 2 is a front view of a conventional brake dynamometer. FIG. 3 is a side view of a conventional torque meter device for a brake dynamometer. FIG. 4 is a front view of a conventional torque meter device for a brake dynamometer. [Description of Signs] 1 DC motor 2 Flywheel 2a Flywheel shaft 4 Brake 10 Torque arms 11 and 12 Load cell 14 Inner swing shafts 15 and 20 Coupling 16 Torque meter 17 Fixed part 18 outer rocking shaft 19 inner hydrostatic bearing 21 outer hydrostatic bearing 22 support

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01L 3/16 G01L 5/28 G01M 17/007

Claims (1)

(57) [Claims] [Claim 1] A torque meter device is connected to a motor via a flywheel and a brake, and the torque when the motor is rotated to operate the brake is measured by the torque meter device. In a brake dynamometer, one end is detachably connected to a flywheel shaft via a brake, and the other end is connected to a torque meter between a fixed portion and a fixed portion. An inner hydrostatic bearing that is formed and supports the inner oscillating shaft in a freely oscillating manner is fixed inside, and an outer oscillating shaft that is detachably connected to the inner oscillating shaft is supported by the support portion, and the outer An outer hydrostatic bearing for swingably supporting the oscillating shaft, a torque arm having one end attached to the outer oscillating shaft, and a load cell provided between the other end of the torque arm and a fixed portion. Feature Torque meter device for rake dynamometer.