JPH0558493B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rotation test method for constant velocity joint boots and a test device therefor, and in particular to a method for testing the rotation of constant velocity joint boots for measuring the amount of expansion during rotation. This invention relates to a rotational testing method and testing device.

[Prior art and its problems]

Generally, one of the functions required of constant velocity joint boots for automobiles is rotational expansion, and this is because expansion of the joint boot during high-speed rotation may cause interference with external components. In order to prevent interference with the outside world, it is necessary to take into account the amount of expansion of the joint boot in advance.In recent years, with the advent of high-output, high-performance engines, it has become increasingly important. Many of them are used in high temperature atmospheres (80
Rotation tests of joint boots are conducted at temperatures between 1300℃ and 1300℃.

In the conventional joint boot rotation test, a photograph is taken during rotation and the amount of expansion of the joint boot is read from this photograph.
There are methods that measure by touching the joint boots with a ruler, height gauge, etc., and methods that measure by irradiating infrared rays etc. to the joint boots. Since it is not a direct current, it takes time for the measurement result to come out, and since it is a photograph, it is unclear whether or not the camera was able to capture the maximum expansion due to the timing of the shutter. Furthermore, there is a problem that it is difficult to work in a high-temperature atmosphere, and when measuring by bringing a ruler, height gate, etc. into contact with the joint boots, the method shown in Fig. 3 a and b. As shown, a joint boot 11 is placed on the rotating shaft 10 and a constant velocity joint 13 and rotated together, and a height gauge 1 placed on a base 12 is attached.
4 to measure the upper end position of the joint boot 11 before rotation and the upper end position of the joint boot 11 during rotation, but since the joint boot rotates at high speed, the work is dangerous and , since the height gauge 14 comes into contact with the joint boot, the measurement value varies and is inaccurate due to this contact force.Furthermore, it is difficult to work in a high temperature atmosphere. In the case of measuring boots by irradiating them with infrared rays, etc., there is a problem in that the measuring device itself cannot be brought into a high temperature atmosphere.

This invention solves the problems of the conventional ones as described above, and is very easy to use.
It is an object of the present invention to provide a rotation test method for a constant velocity joint boot and a testing device therefor, which can accurately measure the amount of expansion of a rotating joint boot.

[Means for solving problems]

In order to solve the above-mentioned problems, this first invention provides a joint boot attached to a rotating body inside a constant temperature bath at a predetermined temperature, and causes the joint boot to rotate the rotating body. The joint boot is rotated at a speed of 100 degrees, and the joint boot is irradiated with a strobe from outside the thermostatic chamber in synchronization with the rotation of the joint boot, and the joint boot is read with a reading microscope. A rotating body that rotates the joint boot is installed in a constant temperature bath that is set to a temperature of
A stroboscope for illuminating the joint boots inside the thermostatic oven is disposed outside the thermostatic oven, and a reading microscope is disposed for viewing the joint boots irradiated by the stroboscope.

[Effect]

According to the invention as described above, the amount of expansion can be measured from the outside with the joint boot placed in a high temperature atmosphere, and the measurement can be carried out with a very simple configuration. becomes.

〔Example〕

Embodiments of the invention shown in the drawings will be described below.

FIG. 1 shows a device according to the present invention, in which a rotation device for rotating a joint boot 2 is provided inside a thermostatic chamber 1, and this rotation device has a pair of arm portions on the upper surface of a base 3. 4a and 4b are installed upright, and a constant velocity joint 5 is attached to one arm portion 4b.
However, a rotating section 6 is provided on the other arm section 4a, and a joint boot 2 is provided between the constant velocity joint 5 and the rotating section 6.

Further, an observation window 7 is provided on the upper surface of the thermostatic chamber 1, and the thermostatic chamber 1 is
A stroboscope 8 and a reading microscope 9 are provided at a position facing the inside of the camera.

Then, the inside of the thermostatic chamber 1 is heated to a predetermined temperature (80℃~
130° C.), the joint boot 2 is rotated at a predetermined speed using a rotating device, and the stroboscope 8 is irradiated at a timing synchronized with the rotation of the joint boot 2, and measurement is performed using the reading microscope 9.

In this case, since the stroboscope 8 is irradiated at a timing synchronized with the rotation of the joint boot 2, the measurement can be performed while the joint boot 2 is not rotating, as shown in FIG. The amount of expansion δ during rotation can be determined by calculating the difference between the displacement during rotation B based on the measured value A before rotation, that is, when stopped, as shown in FIG.
What's more, it allows you to know the results in a high-temperature atmosphere, and since it is a direct reading, you can get the results quickly.Also, since the measurement is magnified, the measurement accuracy is high, so it is easy to use in a high-temperature atmosphere. In measurement, the accuracy of the test temperature is improved compared to conventional methods because the measurement is performed outside the thermostatic chamber, and the work is safer because the measurement is performed without contact.

Furthermore, during the measurement, the amount of deflection of the joint boot during rotation can be measured, and furthermore, the behavior can be easily observed.

〔Effect of the invention〕

By configuring this invention as described above,
Measurement accuracy is high because the measurement is magnified, and
Because it is a direct reading, you can obtain measurement results quickly.
Furthermore, even if the joint boot is placed in a high-temperature atmosphere, the measurement position is at room temperature, so the test temperature can be improved, and since there is no contact, the measurement work is safe.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the invention, Fig. 2 is a diagram showing changes in the joint boot before and after rotation,
FIGS. 3a and 3b are diagrams showing one conventional measuring device. 1... Constant temperature chamber, 2, 11... Joint boots, 3, 12... Base, 4a, 4b... Arm part, 5, 13... Constant velocity joint, 6... Rotating part, 7... Window , 8... stroboscope, 9...
Reading microscope, 10... Rotating shaft, 14... Height gauge.

Claims (1)

[Scope of Claims] 1. A joint boot attached to a rotating body is provided inside a constant temperature oven at a predetermined temperature, and this joint boot is rotated by rotating the rotating body, and the joint boot is rotated by rotating the rotating body, A constant-velocity joint boot rotation test method, characterized in that a stroboscope is irradiated in synchronization with the rotation of the joint boot, and the amount of expansion of the joint boot is directly read with a reading microscope. 2. A rotating device for rotating the joint boots is provided in a thermostatic chamber that is connected to a predetermined temperature and has an observation window, and a strobe that illuminates the joint boots inside the thermostatic chamber is installed on the outside of the thermostatic chamber. A constant-velocity joint boot testing device characterized by having a scope and a reading microscope for reading the amount of expansion of the joint boot irradiated by the stroboscope.