KR0184439B1 - Device for measuring transmission error of differential gear - Google Patents

Abstract

The present invention is a transmission error measuring device of a differential device for transmitting the rotational force of the propulsion shaft to the wheel in a vehicle, the transmission error of the differential device by measuring the phase difference between the input and output gear generated after applying the power to the differential device using a rotary encoder This is a transmission error measuring device of differential device that can measure.

The present invention, the drive motor 2 for rotating the differential device 1 in the running state, the inverter 6 for controlling the rotational speed of the differential device 1 by adjusting the amount of current supplied to the drive motor 2 and By comparing the signals output from the rotary encoders (3,4) and the rotary encoders (3,4) which are integrally fixed to the drive shaft and the driven shaft of the differential device (1) to signalize and output phases, respectively. The differential device 1 rotated by the drive motor 2, including an oscilloscope 5 or the like which compares the phase difference between the drive shaft and the driven shaft of the differential device 1 and displays a transmission error of the differential device 1. When the rotary encoders 3 and 4 signal and output the phases of the driving shaft and the driven shaft, the oscilloscope 5 receives them and compares and displays the transmission errors of the differential apparatus 1.

Description

Transmission error measuring device of differential device

The present invention relates to a transmission error measuring device of a differential device for transmitting the rotational force of the propulsion shaft to a wheel in an automobile, and more specifically, by using a rotary encoder to measure the phase difference between the input and output gears generated after applying the power to the differential device Therefore, the present invention relates to a transmission error measuring device of a differential device capable of measuring a transmission error of a differential device.

In general, a F R type vehicle (rear drive to the front engine) is provided with a differential device that rotates the outer tires quickly and rotates the inner tires slowly so that the tires are not loaded when turning.

The differential gear is integrated with the final gear and is a combination of four bevel gears, two side gears connected to the left and right axles and two other pinion gears facing each other.

With the above configuration, when the vehicle is going straight, the differential gear rotates with the whole differential geared together as the final gear and rotates the left and right axles at the same speed. The tire outside the corner rotates faster than the tire inside.

The differential is fixed to a sub-frame on the rear tire line located at the end of the propulsion shaft in an assembly state in which four gears are assembled inside a differential carrier made of malleable cast iron or aluminum alloy.

On the other hand, in recent years, research is being actively conducted to reduce noise for improving the ride comfort of automobiles. As a part of the research, noise generating devices, that is, devices having a large number of mechanical friction parts, for example, a differential device as described above. Noise reduction studies are also underway.

The present invention is used in the above research process, and to measure the transmission error which is the main factor inducing noise in the differential device.

In general, the noise generated by power trains is proportional to the magnitude of the transmission error.

Transmission error refers to the difference in position between the output gear and the input gear under the assumption that the actual position of the output gear and the drive gear rotate in the power transmission system in perfect agreement. Can be expressed as a linear displacement or in degrees.

These transmission errors are often the result of inaccurate machining such as tooth errors, spacing errors, and run outs, and have a period coinciding with the gear engagement period multiplied by the number of teeth.

Most of the gear noise is characterized by the gear's meshing frequency and its multiples. Therefore, in order to develop a low noise gear, it is necessary to develop a gear having a small engagement frequency component, that is, a small transmission error.

Therefore, it is essential to analyze the transmission error of the differential device in order to develop a differential device with less noise.

However, in the related art, since there was no separate measuring device capable of measuring a transmission error of the differential device, it was impossible to analyze an accurate noise source, and thus there was a limit in developing a low noise differential device.

The present invention, which is intended to overcome the above conventional limitations, by measuring the transmission error between the input and output gear at the same speed as the running speed in the vehicle mounted state, it is possible to easily and differentially in the laboratory within a short time It is an object of the present invention to provide a transmission error measurement device of a differential device that can identify the noise source in the device.

1 is a block diagram showing a structure of a transmission error measuring apparatus of a differential apparatus according to an embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

1: Differential device 2: Drive motor

3, 4: rotary encoder 5: oscilloscope

6: Inverter 7: Driving Belt

8 coupling 9 power supply

10: fixing jig

The present invention for achieving the above object, the drive motor for rotating the drive shaft of the differential device fixed to the fixed jig, and is connected to the drive shaft and the driven shaft of the differential device, respectively, a rotation for sensing the rotation angle of the drive shaft and driven shaft And comparing means for detecting the phase difference between the driving shaft and the driven shaft by comparing and comparing the respective sensing means with the output signals of the respective rotation angle sensing means.

On the other hand, the drive motor is connected to the inverter to control the amount of current supply, it is preferable to control the rotation speed by the control of the inverter.

The rotation angle detecting means may be a rotary encoder coupled to the driving shaft and the driven shaft, or the comparing means may be an oscilloscope for comparing and storing respective output signals from the rotary encoders. It is more preferable to operate by receiving a DC voltage of a constant voltage by the power supply.

EXAMPLE

Hereinafter, a preferred embodiment of the present invention having the configuration as described above will be described in detail with reference to the accompanying drawings.

In describing the present embodiment, the configuration of the present invention, which is the same as the conventional technology described at the outset, will be mainly described only by the parts which are improved so as not to overlap with the related art by omitting for clarity.

1 of the accompanying drawings is a block diagram showing a structure of a transmission error measuring apparatus of a differential apparatus according to an embodiment of the present invention.

As shown, the transmission error measuring device of the differential device in the present embodiment is a drive motor 2 for rotating the differential device 1, and a rotary connected to the end of the drive shaft and driven shaft of the drive motor 2; An encoder (3,4) and an oscilloscope (5) for receiving the output signals of the rotary encoders (3,4), and comparing and analyzing the phase difference according to the rotation of the driving shaft and the driven shaft to perform graphic processing. It can be divided into

In detail, the driving motor 2 is supplied with power through an inverter 6 capable of supplying a regulated amount of current, and the driving motor 2 is supplied with a differential device through the driving belt 7. 1) It rotates. The rotary encoders 3 and 4 are coupled to the driving shaft and the driven shaft end of the differential apparatus 1 and rotate integrally with the driving shaft and the driven shaft, and signal the phase of each axis to oscilloscope ( 5) Send to. In this case, the rotary encoders 3 and 4 and the oscilloscope 5 are supplied with a power supply from a power supply 9 for reducing and outputting a transformer, for example, a voltage of 110V to 10V.

The experimental process by the transmission error measuring device of the differential device of the present embodiment having the above configuration is made as follows.

First, an operator fixes the differential device 1 to the present measuring device with the fixing jig 10. And, by adjusting the inverter (6) according to the rotational speed of the differential device 1 to be measured to turn on (On) the experimental data can be obtained through the oscilloscope (5) through the following process.

When the drive motor 2 supplied with power from the inverter 6 rotates the drive shaft of the differential device 1 connected by the drive belt 7, the drive shaft of the differential device 1 connected by the drive shaft and the internal gear combination rotates. do. At the same time, each rotary encoder 3, 4 coupled to the drive shaft and driven shaft is rotated at the same speed as the drive shaft and the driven shaft, respectively, so that the phase according to the rotation of the drive shaft and the driven shaft, for example, one per revolution Output in pulses. The signals output from the rotary encoders 3 and 4 are input to the oscilloscope 5, and the oscilloscope 5 stores these signals while displaying them graphically so that these signals can be compared.

Therefore, the operator can visually check the phase difference, that is, the transmission error of the driving shaft and the driven shaft of the differential apparatus 1 through the display of the oscilloscope 5, and identify the noise source in the differential apparatus 1 through these data. can do.

According to the present invention as described in detail above, it is possible to measure the noise generated in the differential device during driving in a simple and short time in the laboratory, and the measurement data can be utilized in the development of a low noise differential device. In addition, it is easy to grasp the improvement effect of the previously developed low noise differential device by using this device.

On the other hand, the present invention is not limited to the above-described specific preferred embodiment, and anyone skilled in the art is not limited to the differential device claimed in the claims, and the gear is changed by a simple structure such as a jig. Modifications may also be made in the measurement of transmission errors of power transmission devices having various structures.

Claims (5)

A drive motor for rotating the drive shaft of the differential device fixed to the fixed jig, rotation angle sensing means connected to the drive shaft and the driven shaft of the differential device, respectively, for detecting the rotation angle of the drive shaft and the driven shaft, and the respective rotation angles And a comparison means for detecting the phase difference between the driving shaft and the driven shaft by comparing and comparing the output signals of the sensing means. The transmission error measuring apparatus of claim 1, wherein the driving motor is connected to an inverter for controlling and supplying an amount of current, and the rotation speed is controlled by the control of the inverter. The transmission error measuring apparatus of claim 1 or 2, wherein the rotation angle detecting means is a rotary encoder coupled to the driving shaft and the driven shaft. 4. The apparatus of claim 3, wherein the comparing means is an oscilloscope for comparing and storing each output signal from the rotary encoders. 4. The transmission error measuring apparatus of claim 3, wherein the rotary encoder is operated by receiving a direct current having a constant voltage by a separate power supply.