JPH0222675Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an overstroke prevention structure for a torsion testing machine that tests the torsional characteristics of torsional test objects such as clutch plates and torsional dampers. The present invention relates to an overstroke prevention structure for a torsion testing machine, which prevents the rotation of the torsion tester more than necessary.

As shown in FIG. 1, the clutch plate 1 is formed from a clutch facing 2 and a clutch plate 3 that supports this, and has the function of smoothly transmitting rotation from an engine etc. to the drive shaft side. There is.
Therefore, the clutch plate 1 has clutch characteristics as shown in FIG. That is, if we take the torsion angle θ° on the horizontal axis and the torsion torque TKg-m on the vertical axis, the torsion torque T increases with the torsion angle θ, and at predetermined torsion angles θ ₁ and θ ₂ , the desired torsion is achieved. It is formed so that torques T ₁ and T ₂ are generated.

The torsion tester 4 shown in FIG. 3 is used to test the above-mentioned clutch characteristics of the clutch plate 1, etc., and to judge whether it is good or bad.

The torsion testing machine 4 presses the chuck 12 against the clutch facing 2 using a pressing means such as a motor 5, a gear group 6, an air cylinder, etc., grips and fixes the clutch facing 2, and performs a rotation test to restrain the rotation of the clutch facing 2. Consists of load means 7 etc.
A drive system 10 having an additional means for applying torsional torque to a test object such as a clutch plate 1, a torsional torque detecting means 8, a torsion angle detecting means 9, etc.
and a control means 11 for controlling this drive system 10.

The clutch plate 1 has its clutch facing 2
is held by the chuck 12 of the rotational load means 7, and the clutch plate 3 is inserted and supported by the shaft 8a of the torsional torque detection means 8. A reduction mechanism 13, a coupling A14, a gear group 6, and a coupling B15 are connected to the motor 5, and a drive shaft 16 of the coupling B15 is coupled to a shaft 8a via a torsion torque detection means 8. Further, as is well known, the torsion angle detection means 9 is a double rotation mechanism having two concentric rotating bodies, one of which is connected to the gear group 6 and also connected to the drive shaft 16. The other rotating body is fixed to a frame or the like by a necessary means, and the rotation angle difference generated between the two rotating bodies is detected by electrical means such as a differential transformer or a potentiometer. It's getting old. Therefore, the angle detected by the torsion angle detection means 9 is detected as a relative displacement angle between the clutch facing 2 and the clutch plate 3.

With the above configuration, the clutch characteristics shown in FIG. 2 can be obtained by appropriately rotating the motor 5.

The control device 11 includes a main switch 17, a setting device 18 for setting the torsion torque value, a setting device switch 19 for operating the setting device 18, and a controller 11 for properly depicting the torsion torque value set by the setting device 18 on the recording paper. It is comprised of an amplifier 20 for calibrating and means (not shown) for controlling the drive system 10, torsional torque detecting means 8, torsion angle detecting means 9, etc. based on the above set values.

When determining the clutch characteristics of the clutch plate 1 using the torsion tester 4, first turn on the main switch 17 and set the setting device switch 19 to the neutral side. Next, the setting device 18 sets the maximum torque values T ₁ and T ₂ and the corresponding torsion angles θ ₁ and θ ₂ shown in FIG.

Next, calibration is performed by the amplifier 20 so that the set maximum torque value T ₁ and the like are properly depicted on the recording paper of the torsion tester 4. When the above operation is completed, set the clutch plate 1 at the predetermined position as described above, and turn the setting machine switch 19 from the neutral position upward (for torsion torque value measurement) or downward (for torsional angle value measurement). (for measurement). Next, the motor 5 is started, and when the desired torsion torque value or torsion angle value occurs, the motor 5 is stopped and the measurement results are recorded.

As described above, the clutch characteristics can be obtained, but before setting the test object such as the clutch plate 1, the setting machine switch 19 is mistakenly set upward or downward from the neutral position and the setting machine 18 is turned off. etc., the torsion tester 4 operates at the setting value set by the setting device 18.

On the other hand, as shown in FIG. 4, the torsional torque detecting means 8 includes a drive shaft 16 connected to the shaft 8a and the gear group 6, a strain gauge 25 attached to the drive shaft 16, and a main body side such as a frame. The electric displacement of the strain gauge 25 is taken out by a cord 22, and the torsional torque applied to the drive shaft 16 can be detected.

If the setting machine switch 19 is turned to the torsion torque value measurement side before setting the test object, the torsion testing machine operates so that the detected torque value becomes the set value, as described above. However,
Since the drive system 10 does not include a test object such as the clutch plate 1, the set torsional torque value is not generated. Therefore, the drive shaft 16 will rotate permanently. There is no problem when the rotation of the drive shaft 16 is small, but as the rotation angle increases as shown in FIG. Eventually, the problem of disconnection occurs.

This invention was devised to solve the above problems, and its purpose is to reliably prevent the drive system from rotating more than necessary due to any cause such as incorrect operation, and to ensure the safety of the test machine. An object of the present invention is to provide a simple overstroke prevention structure for a torsion tester that improves performance.

In order to achieve the above object, the present invention includes a load means for fixing a test object, a strain gauge attached to a rotatable drive shaft connected to a rotating part of the test object, and a strain gauge attached to a rotatable drive shaft. a torsion torque detection means for extracting electrical displacement through a cord; a torsion angle detection means for detecting a torsion angle of the rotating part of the test object through the drive shaft; and a torsion angle detection means for applying rotational force to the drive shaft. In a torsion testing machine having a drive system and a control device for controlling the drive system, a switch operating member that rotates in synchronization with the rotation of the drive system is provided, and a rotation circle of the switch operating member is provided. The present invention is characterized in that a limit switch for controlling the rotation of the drive system is provided on the fixed side of the torsion testing machine, which is spaced apart from the switch operating member by an appropriate rotation angle on the circumference.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

As shown in FIGS. 6 and 7, a pair of switch actuating members 23, 23 are fixed to the outer peripheral side of a coupling A14 connected to the deceleration mechanism 13 of the drive system 10 at positions separated by an angle 2α. On the other hand, on the rotational circumference of the switch actuating member 23, a limit switch 24 which is opened and closed by the switch actuating members 23, 23 is provided.
It is provided in the center of 3 and 23. This limit switch 24 is fixed to the fixed side of the torsion tester 4. Further, the angle α is set to about 20° in this embodiment.

Next, the operation of this embodiment will be explained.

As mentioned above, due to the erroneous operation of the setting machine switch 19, the setting machine switch 19 was set to the above-mentioned upper side or lower side, and the torsional torque was set by the setting machine 18 without setting the object under test such as the clutch plate 1. Once the values and the like are set, the drive system 10 begins to rotate.
Since the coupling A14 is arranged within the drive system 10, it also rotates. Therefore, the switch actuating member 23 rotates in synchronization with that direction. However, when the switch operating member 23 rotates by the angle α, it comes into contact with the limit switch 24 and the drive system 10
stop the rotation. This prevents the drive system 10 from rotating more than necessary, and prevents the cord 22 from being cut or the like. Further, when the setting machine switch 19 is returned to the neutral state by the above-mentioned stop, the switch operating member 23 returns to the return position and stops.

In addition, since the switch actuating members 23, 23 are arranged on both sides of the limit switch 24 as described above, they can operate in the same manner in the forward and reverse rotation directions.

In this embodiment, the switch actuating members 23, 2
3 is provided on the outer periphery of the coupling A14, but the present invention is not limited thereto, and the coupling may be provided at any appropriate location in the drive system. Further, although the switch actuating members 23, 23 and the limit switch 24 are of a contact type, they are not limited to this. Further, the angle α is not limited to 20°.

As is clear from the above explanation, according to the present invention, it is possible to reliably prevent the drive system from rotating more than necessary, thereby preventing damage to the torsion tester due to incorrect operation, etc. safety can be improved. Further, the present invention has a simple structure using a switch operating member and a limit switch, so it can be implemented easily and at low cost.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the clutch plate, Fig. 2 is a diagram showing clutch characteristics, Fig. 3 is a front view showing a conventional torsion tester, and Fig. 4 is a sectional view showing the general structure of the torsion torque detection means. , FIG. 5 is a sectional view showing an abnormal rotation state of the torsion torque detection means, FIG. 6 is a partial front view showing an embodiment of the present invention, and FIG. 7 is a partial plan view of arrow A in FIG. 6. FIG. 8 is an explanatory plan view showing the operation of the above embodiment. 1... Clutch plate, 2... Clutch facing, 3... Clutch plate, 4... Torsion tester, 5... Motor, 6... Gear group, 7... Rotating load means, 8... Torsion torque detection Means, 8a...
Shaft, 9... Torsion angle detection means, 10... Drive system, 11... Control device, 12... Chuck, 13
...Reduction mechanism, 14...Coupling A, 15...
...Coupling B, 16... Drive shaft, 17... Main switch, 18... Setting machine, 19... Switch for setting machine, 20... Amplifier, 21... Case,
22... Cord, 23... Switch operating member, 2
4...Limit switch.

Claims (1)

[Scope of utility model registration request] A torsion system in which a strain gauge is attached to a load means for fixing a test object, and a drive shaft that is connected to a rotating part of the test object and is freely rotatable, and the electrical displacement of the strain gauge is taken out via a cord. a torque detection means, a torsion angle detection means for detecting a torsion angle of the rotating portion of the test object via the drive shaft, a drive system for applying rotational force to the drive shaft, and a control device for controlling the drive system. In the torsion testing machine, a switch operating member that rotates in synchronization with the rotation of the drive system is provided in the drive system, and an appropriate rotation angle is set from the switch operating member on the rotational circumference of the switch operating member. An overstroke prevention structure for a torsion testing machine, characterized in that a limit switch for controlling the rotation of the drive system is provided on a fixed side of the torsion testing machine, which is spaced apart by the same amount.