JPH0521416B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dynamometer that generates load torque using slip braking of a wet multi-disc brake.

A dynamometer measures the relationship between output rotational speed and output torque shown as a performance curve in prime movers such as engines, turbines, and motors, as well as the output of transmissions, torque converters, fluid couplings, pumps, blowers, etc. driven by prime movers. It is applied to measure the relationship between output rotation speed and load torque, which are shown as characteristics.

Conventionally, dynamometers used include water dynamometers, eddy current dynamometers, and disc brake dynamometers, but water dynamometers and eddy current dynamometers are in a stall state, that is, when rotation has stopped completely. There is a drawback that sufficient load torque cannot be obtained in the low speed range due to the state of the brake, and the disc brake dynamometer has the drawback that it is difficult to obtain load power or large load power in the high speed range, causing inconvenience. There is.

In contrast, the wet multi-plate dynamometer of the present invention is capable of continuous measurement from a stall state to a high speed range. For example, the graph in FIG. 2 shows the relationship between the conventional water dynamometer and disc brake dynamometer and the wet multi-disc brake of the present invention when the relationship between output rotational speed and load torque of a torque converter has a characteristic like curve abc. The load torque capacity of the wet multi-plate dynamometer covers the entire rotational speed range of the torque converter's load torque characteristic curve abc, as shown by the dashed line d. Therefore, even if two hydraulic dynamometers with different capacities are used, as shown by dotted lines ef, it is not possible to cover the entire rotation range of curve abc, and each curve ef covers rotation speed ranges B and C, respectively. The sections are included, but the section A with low rotational speed cannot be measured. Furthermore, the disc brake dynamometer whose capacity is indicated by the two-dot chain line g can only measure the low speed range.

As mentioned above, the device of the present invention not only covers the entire speed range, but also automatically provides the required rotational speed or load torque by simple operation of controlling the hydraulic pressure and lubricating oil amount of the brake. Continuous operation for long periods of time is possible. There is also this effect. That is, the rotation speed is detected by a rotation speed detector and the load torque is detected by a torque detector, and this detection signal is compared with the setting signal from the setting device by a comparator and corrected by the deviation. This signal is applied to the comparison solenoid valve to control the brake hydraulic pressure so as to produce the set speed or set load torque. In addition, in order to eliminate heat generation due to plate friction loss, lubricating oil is supplied in proportion to the load torque and plate slip speed, and a temperature sensor is installed at the lubricating oil outlet to prevent lubrication when the temperature exceeds the set temperature. Since the oil amount is increased and controlled to maintain the temperature below the set temperature, continuous operation over a long period of time is possible.

First, in FIG. 1, reference numeral 1 denotes an input shaft that is pivotally supported in a housing 2 by bearings 3 and 4, and a friction plate is attached to a spline 6 on the inner circumference of an external cylinder 5 integrally formed with the input shaft so as to be slidable in the axial direction. Mesh 7,
A steel plate 11 is axially slidably engaged with a spline 10 on the outer periphery of an output-side inner cylinder 9 fixed to the housing 2 via a flange portion 8,
Through a ring-shaped piston 13 fitted into an annular cylinder 12 integrally provided in the inner cylinder 9, friction plates 7 and steel plates 11 arranged alternately are connected to a piston chamber 14 from an oil reservoir 15 to a pump 16. As a result, it is pressed by brake operating oil pressure supplied via a pressure regulating valve 18 provided in the oil passage 17 and a proportional solenoid valve 19.

The input shaft support 1 is provided with a rotational speed detector 20, and these detection signals 21 are given to a comparison calculator 23 via a speed signal converter 22, and the speed from a speed setting device (not shown) is The rotational speed of the input shaft 1 is maintained at the set value by comparing the speed correction signal 25 with the set signal 24 and adjusting the difference by P and applying it to the proportional solenoid valve 9 to control the brake operating oil pressure. Ru. On the other hand, a torque detector 26 is provided on the input shaft 1, detects the magnitude of the torsion of this shaft as a load torque, and sends this torque detection signal 27 to a comparator 23 via a torque signal converter 28, A load torque is applied to the input shaft 1 by comparing it with a torque setting signal 29 from (not shown) and adjusting the difference by P to the comparison solenoid valve 7 to control the brake operating oil pressure. is maintained at the set value. The above speed correction signal 25 and torque correction signal 30 are switched and applied to the proportional solenoid valve 19 to achieve constant rotational speed control and constant torque control, respectively.

In addition to the constant control described above, the rotational speed detection signal 21 and the torque detection signal 27 have a predetermined functional relationship, for example, the rotational speed is controlled so that the torque is obtained in proportion to the first power, square, cube, etc. of the rotational speed. A rotational speed-torque ratio setting device (not shown) that provides a signal 31 that sets the ratio of torque and torque can also be provided by switching. A signal is given to the proportional electromagnetic valve so that the ratio of this ratio setting signal and the rotational speed and torque detection signal raised to the 1st to 3rd powers becomes equal.

The plate being measured is in a slip state, so
Since heat generation due to friction loss of the plate is large, a large amount of cooling lubricating oil is pumped from the oil reservoir 15 to the cooler 3 by an oil pump 32 in order to prevent the plate from seizing.
3 and a lubricating oil regulating valve 34, the oil flows into the annular portion 36 inside the inner cylinder 9, and further flows out through the hole 37 provided in the radial direction of the inner cylinder 9, and the oil flows into the plates 7 and 11. It is designed to be supplied to the sliding surface. When the load torque and slip speed are large, the amount of heat generated due to the increase in friction loss horsepower of plates 7 and 11 increases, so the amount of lubricating oil supplied increases to improve the cooling effect, and when the load torque and slip speed are small, the amount of heat generated decreases. In addition, in order to prevent unstable control due to rotation of the plate, control is performed to reduce the amount. In such a control, when performing constant rotation speed control, a torque rotation speed correction signal 38 obtained by multiplying and correcting the detection signal 27 from the torque detector 26 by the rotation speed setting signal 24 is used.
When performing constant torque control, the detection signal 21 from the rotational speed detector 20 is used as the torque setting signal 2.
This is done by amplifying the rotational speed/torque correction signals 39 that have been multiplied by 9 and applying them to the lubricating oil regulating valve 34.

In order to detect the outlet temperature of the lubricating oil, a temperature sensor 40 is installed close to the outer periphery of the outer cylinder 5 to detect the outlet temperature of the lubricating oil.
It is supported and installed. This temperature sensor 4
The temperature detection signal 41 from 0 is sent to the temperature signal converter 42.
is applied to the comparison calculation device 23 and compared with the temperature setting signal 43 from the temperature setting device (not shown). If the detection signal 41 exceeds the setting signal 43, the difference is converted into the torque rotation speed correction signal. 38, or when comparing and calculating the rotational speed/torque correction signal 39,
The added amount is applied to the lubricating oil regulating valve 34 to control the amount of lubricating oil to increase, thereby preventing seizure of the plate.

As mentioned above, the amount of heat generated by plate slippage, that is, the amount of horsepower loss, is proportional to the input shaft rotational speed and load torque, so lubrication is performed using a signal corrected by multiplying the rotational speed and load torque signals. Although we decided to control the oil adjustment valve, there is also a countermeasure against abnormal temperature rise using a temperature sensor, and since precision is not required, it may be possible to simply control with a correction signal that is the sum of both signals. If the correction signal is adjusted to supply the maximum required flow rate, the supply amount will be kept high even when the rotational speed or torque decreases, thereby preventing uneven supply of lubricant to the plate. Another effect is that the danger of the plate becoming seize can be prevented.

As mentioned above, the device of the present invention not only provides the required rotational speed or load torque over the entire speed range, but also adjusts the amount of lubricating oil on the plate in proportion to the load torque and plate slip speed. This has the effect of allowing continuous operation over a long period of time.

[Brief explanation of drawings]

Fig. 1 shows a sectional view of the device of the present invention and a block diagram of its control circuit, and Fig. 2 shows a relationship between rotational speed and brake torque comparing the present invention and a conventional dynamometer. . DESCRIPTION OF SYMBOLS 1...Input shaft, 2...Housing, 5...Outer cylinder, 6, 10...Spline, 7...Friction plate, 8...Flange part, 9...Inner cylinder, 11
... Steel plate, 12 ... Cylinder, 1
3... Piston, 19... Proportional solenoid valve, 20...
Rotation speed detector, 23... Comparison calculator, 26...
Torque detector, 34... Lubricating oil adjustment valve, 40...
Temperature detector.

Claims (1)

[Claims] 1. For measuring the load torque characteristics of a prime mover and a drive machine, an outer friction plate is fitted to the inner circumferential spline of the outer cylinder so as to be slidable in the axial direction, The inner friction plate is movably fitted, one of the outer cylinder or the inner cylinder is configured integrally with an input shaft connected to the output shaft of the prime mover or the drive machine, and the other is fixed to the housing in a non-rotatable manner, and the above-mentioned A wet multi-plate brake is provided with a rotational speed detector and a torque detector on the input side of a wet multi-disc brake in which outer plates and inner plates are arranged alternately and are pressed by hydraulic pressure via an annular piston, and these detectors are also provided. A wet multi-disc dynamometer is equipped with a comparator that compares the detection signal from a set signal with a set signal and issues a control signal, and a brake hydraulic pressure control valve that is operated by this control signal. A rotation speed setting device to maintain the rotation speed at the required value, a torque setting device to maintain the load torque at the required value, and a rotation speed/torque ratio setting device to maintain the rotation speed and load torque in the required functional relationship. In addition, a lubricating oil regulating valve is installed in the oil passage that supplies lubricating oil for plate cooling from a hydraulic source to the hollow part of the internal cylinder, and a The lubricating oil adjustment valve is controlled by the rotation speed/torque correction signal obtained by multiplying and correcting the detection signal by the torque setting signal, or by the torque rotation speed correction signal obtained by multiplying and correcting the detection signal from the torque detector by the rotation speed setting signal. A wet multi-plate dynamometer characterized by being controlled. 2. A temperature detector is installed close to the outer periphery of the external cylinder on the input side to measure the outlet temperature of the lubricating oil for cooling the plate, and this detection signal is compared with the temperature setting signal, and when it exceeds the setting signal, the The wet multi-plate dynamometer according to claim 1, wherein the lubricating oil regulating valve is controlled by a temperature correction signal obtained by adding the deviation signal to a rotational speed/torque correction signal or a torque rotational speed correction signal.