JPS6042353Y2 - Rotating torsion bending tester - Google Patents

Description

[Detailed description of the invention] This invention relates to a testing machine used to conduct durability tests of rotating shafts that are subjected to simultaneous torsion and bending, such as the main shaft and countershaft of automobile transmissions. .

Conventionally, there was no equipment to test the rotary shaft alone, so the transmission assembly and the like were set in an endurance testing machine and the gears were tested for durability while the main shaft and other parts were tested for durability.

However, since the gear strength is generally designed to be lower than the shaft strength, the gear will be damaged before the shaft is broken.

For this reason, in the past, several gears were prepared for one shaft, and if a gear broke during the test, the test was interrupted, a new gear was set on the shaft, and the test was restarted. There was a problem in that testing the rotating shaft required a great deal of labor and expense.

In order to eliminate such problems, the inventors previously proposed a device for testing the rotary shaft alone as Utility Model Application No. 53-36225 (Utility Model Application Publication No. 54-140401).

However, since this only has the function of applying rotational twist to the rotating shaft, it is not necessarily suitable for durability testing of rotating shafts that are subjected to rotational twisting and bending at the same time, such as the main shaft and countershaft of transmissions. I couldn't say that.

This idea was made in view of the above, and it is possible to conduct durability tests on rotating shafts that are subjected to simultaneous torsion and bending, such as the main shaft and countershaft of transmissions, by using gears, etc. as in the past. The aim is to provide a testing machine that can test the shaft alone without any problems.

In order to achieve this purpose, this invention includes a first inertia rotationally driven by a motor, a Fuchs joint that connects one end of the test shaft to the center of rotation of the inertia, and a Fuchs joint at the other end of the test shaft. a second inertia that connects the center of rotation, a radial load device that applies a bending force to the test shaft, an output shaft of the joint centering on the Fuchs joint, a test shaft, a second inertia, and a radial load device. and means for integrally tilting and displacing the first inertia with respect to the rotation axis of the first inertia.

This makes it possible to apply a bending force from the radial load device to the test shaft, which is subjected to rotational twist by the Fuchs joint and the pair of inertias.

An embodiment of this invention will be described below in detail based on the accompanying drawings.

In the figure, a motor 2 is attached to a bed 1 of the test machine, and a first motor is connected to the motor 2 via a continuously variable transmission 3 as a speed change means and a power transmission means consisting of pulleys 4, 5 and a bed 6. The inertia 7 of is supported by bearings 8 and 9.

A movable base 10 disposed on the bed 1 has an output shaft 14 of a Fuchs joint 13 whose input side is coupled to the rotating shaft 11 of the first inertia 7 with a flange coupling 12, which is supported by a bearing 15. At the same time, this output shaft 14
The second inertia 16 is supported by bearings 17 and 18 on an extension line (on the same axis).

Further, by attaching chucks 20.21 to the shaft end of the output shaft 14 of the Fuchs joint 13 and the input side shaft end of the rotating shaft 19 of the second inertia 16,
The Fuchs joint 13 and the second inertia 16 are interlocked via the test shaft 22.

Further, the movable base 10 has both chucks 20.
A test shaft 2 that connects the output shaft 14 of the Fuchs joint 13 and the rotating shaft 19 of the second inertia 16 via 21
2 is equipped with a radial load device 23 that applies a bending force.

This load device 23 includes a column 24 fixed to the movable base 10, a cylinder 25 fixed to the upper end of the column 24,
A swinging rod 2 whose one end is pivotally connected to the column 24 and whose other end is connected to the tip of the piston rod 26 of the cylinder 25.
7 and a bearing 28 attached to the swinging rod 27. By inserting this bearing 28 into the test shaft 22, the swinging rod 27 and the bearing 28 are moved as the cylinder 25 expands and contracts. A bending force is applied to the test shaft 22 through the test shaft 22.

The movable base 10 is connected to the Fuchs joint 1.
As shown by the two-dot chain line in FIG. 1, the first inertia 7 is fastened to the bed 1 with bolts or the like (not shown) so that it can be tilted and displaced about the rotating shaft 11 with the first inertia 7 as the center.

In the above configuration, the movable base 10 is now fixed at a position where the rotating shaft 11 of the first inertia 7 and the output shaft 14 of the Fuchs joint 13 are on a straight line, as shown by the solid line in FIG. Suppose that the motor 2 is rotated.

Then, the rotation of the motor 2 is increased or decreased as appropriate by the transmission 3, and is transmitted to the first inertia 7 via the belt transmission mechanism.

At this time, even if the rotational torque of the motor 2 fluctuates, the rotating shaft 11 is rotated at a constant speed by the constant rotation action of the inertia 7.

Also, since the rotation of the rotating shaft 11 is transmitted to the input end of the test shaft 22 via the Fuchs joint 13, the test shaft 2
2 rotates at a constant speed together with the second inertia 16.

Furthermore, when the movable base 10 is tilted and fixed by an angle θ as shown by the two-dot chain line in FIG. 1, the input/output axis of the Fuchs joint 13 is tilted by θ.

As a result, even if the rotating shaft 11 of the first inertia 7 rotates at a constant speed, the output shaft 14 of the Fuchs joint 13
That is, the input end of the test shaft 22 is rotationally driven at an inconstant speed.

In this way, when an inconstant rotational force is input to the input end of the shaft 22 under test, the shaft 22 under test tries to rotate at a constant speed, but the output end of the shaft 22 has a second Inertia 1 of
Since the rotation shaft 19 of No. 6 is connected, the output end of the test shaft 22 is likely to be rotated at a constant speed.

As a result, a torsional force is applied to the test shaft 22 in a required cycle.

Incidentally, the reaction force of the inconstant rotation generated at the Fuchs joint 13 tries to be transmitted to the first inertia 7 side, but
Since the rotating shaft 11 continues to rotate at a constant speed due to the inertial force of the inertia 7, a rotational torsion force is continuously applied to the test shaft 22 in a cycle corresponding to the rotational speed of the Fuchs joint 13.

Therefore, in order to change the cycle of the torsional force applied to the test shaft 22, it is sufficient to change the gear ratio of the transmission 3.

In order to change the magnitude of the torsional force, the inclination angle of the movable base 10 may be changed.

Note that when the gear ratio of the transmission 3 is changed in order to change the cycle of torsional force, the number of rotations applied to the test shaft 22 changes accordingly, but this number of rotations can be changed independently, or When only the torsional force cycle needs to be changed,
A transmission (not shown) may be interposed in the middle of the output shaft 14 of the Fuchs joint 13 or between the output shaft 14 and the chuck 20 that holds the input end of the shaft 22 under test.

On the other hand, when compressed air or pressure oil is supplied to the cylinder 25 of the radial load device 23 to cause the piston rod 26 to expand or contract, the swinging rod 27 swings accordingly.

Then, the bearing 28 inserted into the test shaft 22 moves up and down together with the swinging rod 27 to apply a bending force to the test shaft 22.

Further, the magnitude of this bending force is controlled by the output of the cylinder 25.

Therefore, while rotating the shaft 22 under test as described above, this shaft 2
Since torsional force and bending force can be applied to the shaft, the shaft can be subjected to rotational torsion bending tests by itself without using gears or the like as in the conventional method.

Incidentally, the hook joint, the radial load device, the tilting mechanism of the movable base, etc. are not necessarily limited to those shown in the embodiments.

As explained above, the test device according to this invention organically combines the uniform rotational action of the inertia, the nonuniform rotational action of the Fuchs joint, and the bending action of the radial load device to rotate the test shaft. Since it is possible to apply force, torsional force, and bending force simultaneously or independently, it is possible to apply shafts to the main shaft and countershaft of a transmission, for example, without using gears as in the past. Since the test can be performed using only a heavy body, the number of man-hours and cost required for the rotating torsion bending test can be reduced.

[Brief explanation of drawings]

The drawings show an embodiment of the rotary torsion bending tester according to the invention, and FIG. 1 is a partially cutaway plan view, and FIG. 2 is a sectional view taken along the line 1--2 of FIG. 1...Bed, 2...Motor, 7...
...First inertia, 10...Movable base, 11...Rotating shaft, 13...Fuchs joint, 14...Output shaft, 16...
...Second inertia, 19...Rotation axis, 22
... Test shaft, 23 ... Radial load device.

Claims (1)

[Scope of utility model registration request] A first inertia rotationally driven by a motor, a Fuchs joint that connects one end of the shaft under test to the center of rotation of the inertia, and a second shaft that connects the center of rotation to the other end of the shaft under test.
a radial load device that applies a bending force to the test shaft, and an output shaft of the joint, a test shaft, a second inertia, and a radial load device centered on the Fuchs joint, and a radial load device that applies a bending force to the test shaft. A rotating torsion bending tester comprising means for integrally tilting and displacing a rotating shaft.