JPH0625706B2 - Rotational fluctuation tester - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is a rotation fluctuation tester that simulates the power transmission of a reciprocating engine such as an engine, and in particular OHC, DOHC.
To simulate transmission parts such as toothed belts for automobiles that link camshafts and crankshafts of engines, etc. for automobiles, chains driven by diesel engines and other sources, couplings, gears, etc., where angular velocity and torque change periodically. The present invention relates to a rotation fluctuation tester that tests the performance of the above-mentioned transmission component by applying rotation fluctuation or torsional vibration.

(Prior Art) Performance tests of a series of power transmission mechanisms such as gears, chains, belts, couplings, bearings, dampers driven by the crankshaft of a reciprocating engine such as an engine are generally conducted for safety, noise,
Due to the problem of control characteristics, a real engine or the like is not used, but a test device that uses an electric motor as a power source is used.

However, while the electric motor has a small change in the angular velocity of rotation and smoothly rotates, the engine or the like has a rotational characteristic in which the angular velocity changes periodically due to the presence of top and bottom dead centers, explosive exhaust gas, and the like.

Therefore, if the drive source of the test apparatus is simply replaced with the electric motor from the engine, the stress applied to the DUT becomes smaller than the actual stress, resulting in a test result different from the actual one.

Therefore, the present inventor has previously proposed a rotation variation tester that uses a motor as a drive source and outputs a rotational force having an angular velocity change, to which the cardan error of a universal joint is applied (Japanese Patent Application No. 145758/1986). Wish year 62 1
17792).

The rotation fluctuation tester disclosed in the above-mentioned patent application transmits a rotational force to an output shaft from a motor through a universal joint that is inclined and set at a constant angle.

(Problem to be Solved by the Invention) The rotation fluctuation testing machine of the prior art has the effect of being able to output the rotation that makes an arbitrary change in angular velocity with a simple means.

However, when comparing with the power transmission of an actual engine,
There is still a phase in the transmission characteristics that cannot be ignored. For example, in an OHC engine, a toothed belt or gear that transmits power between a crank shaft and a cam shaft, or a transmission mechanism when driving a cooler or the like that performs other reciprocating motions by the engine, has a periodic change in angular velocity of a drive source In addition, a periodic change in torque due to the load characteristic is applied.

That is, in the transmission mechanism illustrated above, the load torque changes periodically due to the change of the pressure angle due to the rotation of the cam and the compressed exhaust of the compressor. On the other hand, the conventional rotation fluctuation tester can output the change in the angular velocity on the drive side but cannot change the torque. Therefore, there is a lack of practicality in performing these tests, and improvement is desired.

Furthermore, in the past, a predetermined load was applied from the outside when performing this type of test, but due to the nature of the test, the test time is often long and the power consumption is very large, which is not economical. There was a need for improvement.

Therefore, the present invention focuses on the above-mentioned drawbacks of the prior art, and it is possible to periodically vary not only the rotation speed but also the load torque,
It is also an object of the present invention to provide a rotation fluctuation tester with low power consumption.

(Means for Solving the Problems) Therefore, the feature of the present invention for achieving the above object is that a power transmission mechanism as an object to be measured is fitted between both shafts and has an input shaft and an output shaft. This is a rotation fluctuation tester in which the input shaft is connected from the input side induction motor or the synchronous motor via a universal joint that is set at an arbitrary angle, and similarly the load shaft is connected from the load side induction motor or the synchronous side. The rotation fluctuation tester is connected via a universal joint that is inclined from the motor and set at an arbitrary angle, and the input side motor and the load side motor are electrically connected in combination so as to be regeneratively braked.

The input shaft of the rotation fluctuation testing machine of the present invention is connected to the input side induction motor or the like via a universal joint that is inclined and set at an arbitrary angle, and the rotation fluctuation periodically occurs due to the Cardan error of the universal joint. Occur.

On the other hand, the output shaft is connected to the load-side induction motor that serves as a load and applies a load to the DUT, but since the output shaft is also connected to the load-side motor by the universal joint, the rotation of the output shaft causes the load-side The motor is rotated together with periodical rotation fluctuations to generate a cyclically varied load.

Further, since the input-side induction motor and the load-side induction motor are electrically connected by combining them from a single power source so that regenerative braking can be performed, the load-side induction motor acts as a generator to recover electric energy.

(Examples) Specific examples of the present invention will be described below.

FIG. 1 is a mechanical view of a rotation fluctuation testing machine in a specific embodiment of the present invention, and FIG. 2 is a perspective view of a universal joint.

In the figure, (1) indicates a rotation fluctuation tester according to a specific embodiment of the present invention. (2) is the input shaft and (3) is the output shaft. Input shaft
(2) is connected to a two-pole induction motor (5) via a universal joint (4) as illustrated in FIG.
Here, (6) and (7) are bearings, and (8), (9) and (10) are flange shaft joints.

On the other hand, the output shaft (3) is connected to a 4-pole output side induction motor (12) via a universal joint (11). Like the input shaft, (13) and (14) are bearings, and (15), (16) and (17) are flange shaft joints. The input-side induction motor (5) and the output-side induction motor (12) are connected from a common AC power source (18) so that they can be regeneratively braked.

Further, in the present embodiment, the input side induction motor (5) is connected from the AC power source (18) through the inverter (19) and the phase control device (20). A pulley (21) is connected to the input shaft (2) and a pulley on the input shaft side is connected to the output shaft (3).
A pulley with a diameter twice that of (21) is connected.

A toothed belt (23) as a measured object is suspended between the pulleys (21) and (22). In this embodiment, the AC power supply (18) to the inverter (19) and the phase control device (20)
AC power having a frequency higher than the power supply frequency and set to a predetermined phase is input to the input side induction motor (5) via the. The rotational force of the input side induction motor (5) is transmitted to the input shaft (2), but during this time it goes through the universal joint (4) that is inclined and set at a predetermined angle, so that the input shaft (2) is periodically rotated. Rotational force with varying rotational speed is output. This rotational force is transmitted through the pulley (21) to the toothed belt (23) as the DUT.
And further transmitted to the output shaft (3) via the pulley (22). The rotation speed of the output shaft (3) is half that of the input shaft (2). The output shaft (3) is the load side induction motor (1
2) and applies a load to the toothed belt (23), but a universal joint is installed between the output shaft (3) and the load side induction motor (12) at a predetermined angle. Since it is interposed, the load side induction motor (12) is rotated with a rotational force that periodically changes with respect to the rotation of the output shaft (3), and gives a periodically changing load to the output shaft (3). The load side induction motor (12) is rotated at half the number of revolutions of the input side induction motor (15), but the number of poles itself is twice that of the input side induction motor (5), and the rated number of revolutions is the input side induction motor. Half of (5)
Therefore, half of the frequency raised by the inverter (19) is higher than the rated speed for the AC power supply (18).
It is rotated at a faster rotation speed. Therefore, the load side induction motor (12) acts as a generator to regenerate electric energy.

In the present embodiment, the inverter (19) not only can rotate the input shaft side motor (5) at an arbitrary rotation speed by adjusting this, but also the rated rotation of the input side motor (5) and the load side motor. The number can be made different and the magnitude of the load can also be changed.

However, the above-mentioned inverter (19) is, for example, the input side motor (5) by combining various diameters of the pulleys (21) and (22).
It may be omitted when changing the rated speed of the load side motor. Phase control device is the input side motor
By changing the phase of the AC power input to (5), the timing of the rotation fluctuation of the input shaft (2) and the load fluctuation of the output shaft (3) is adjusted.

As described above, in the present embodiment, both the input side motor (5) and the load side motor (5) use the induction motor, but the same effect can be obtained by using the synchronous motor.

(Effect) Since the rotation fluctuation testing machine of the present invention is connected to the motor through the universal joint in which both the input shaft and the output shaft are inclined and set at an arbitrary angle, the measured object can be changed by the input shaft. Not only the rotation fluctuation is given, but also the fluctuation load is given by the output shaft.

In addition, since the electric motors are electrically connected so as to be regeneratively braked, electric energy is regenerated and power consumption is small.

Therefore, the rotation fluctuation tester of the present invention has an effect of being able to perform a test for applying a rotational force and a load imitating an engine with a small power consumption.

[Brief description of drawings]

FIG. 1 is a mechanical view of a rotation fluctuation testing machine in a specific embodiment of the present invention, and FIG. 2 is a perspective view of a universal joint. (1) …… Rotation fluctuation tester (2) …… Input shaft (3) …… Output shaft (4) (11) …… Universal joint (5) …… Input side induction motor (12) …… Load side induction Motor (19) …… Inverter (20) …… Phase controller

Claims (1)

[Claims] 1. A rotation fluctuation tester having an input shaft and an output shaft, in which a power transmission mechanism as an object to be measured is fitted between both shafts, wherein the input shaft is an induction motor or a synchronous motor on the input side. Connected via a universal joint set at an arbitrary angle, and similarly, the load shaft is connected from a load side induction motor or synchronous motor via a universal joint set at an arbitrary angle. ,
The rotation fluctuation tester characterized in that the input side motor and the load side motor are electrically connected by combining them so that regenerative braking is possible.