JPH0562842U - Bearing friction automatic measurement mechanism - Google Patents

Abstract

(57) [Summary] [Purpose] The bearing friction automatic measurement mechanism is operated by the power supply only. [Structure] A bearing 19 which is an object to be measured is supported by an inner ring drive motor 20 and a male center 28, and friction generated on an outer ring is transmitted to a load detection unit 16 via an arm 18. The load detection unit 16 is positioned by moving the rubber sheet 15 from the small DC motor 11 to the moving side linear guide bearing 10 by converting the rotational motion into a linear motion and moving to the left and right by the transmitted force. [Effect] By using a small DC motor as the drive source, it is possible to operate in a laboratory or factory that has only an electric power source without an air source. Can detect abnormalities.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bearing friction automatic measuring mechanism, and more particularly to a load detecting unit positioning mechanism.

[0002]

[Prior Art]

 As shown in FIG. 3, the conventional automatic friction measuring mechanism for a bearing has an outer ring of a bearing 19 as an object to be measured and an arm 18, and an inner ring of the bearing 19 is integrally fitted with a shaft 22 having a slot groove. The end of the grooved shaft 22 is cut into a thread groove, and the opposite side has a center hole.

Both ends of the threaded grooved shaft 22 are held by an inner wheel drive motor 20 having a shaft end portion processed into a convex shape and a male center 28. The arm 18 and the probe 17 are in point contact with each other. The probe 17 is a part of the components of the load detection unit 16.

The load detection unit 16 is fixed to the moving table 1, the linear guide cylinder blocks 23 and 24 are fixed to the moving table 1, and the cylinder rod 25a and the cylinder body 25 are commercially available products (for example, SMC product). Catalog No. CDBX2N1 5-25B type).

Two air tubes 26 are connected to the cylinder body 25. The cylinder body 25 is fixed to the sub base 2, and the connecting stud 3 is fixed to the sub base 2 and fixed to the base 4. A right stopper 5 and a left stopper 6 are fixed to both ends of the sub base 2.

Next, the operation will be described. Part of the rotational force of the inner-wheel drive motor 20 is transmitted as friction to the outer ring of the bearing 19 that is the object to be measured through the shaft 22 with the slot groove, and becomes the rotational force of the arm 18. The rotational force of the arm 18 is When it comes into contact with the probe 17, it is transmitted to the load detection unit 16 to be detected and measured.

In the load detection unit 16, the cylinder rod 6 is moved by the air pressure supplied from the air tube 26 to the cylinder body 25 fixed to the sub-base 2, and the movement table is moved via the linear guide cylinder blocks 23 and 24. 1 is moved to the left and right by a distance determined by the right stopper 5 and the left stopper 6 to be positioned.

When the movable table 1 is moved and positioned to the left, the inner wheel drive motor 20 rotates counterclockwise, the measurement is transmitted to the load detection unit 16, and the movable table 1 is moved to the right by the measurement end signal. Then positioned.

[0009]

[Problems to be solved by the device]

 Since this conventional automatic friction measurement mechanism for bearings uses an air cylinder and a solenoid valve to drive and control the air cylinder, it requires two powers, air and a power supply. It had the drawback of not working.

Further, since the air cylinder is used, it is difficult to adjust the speed to a constant speed due to the vibration of the load inspection unit and the influence of the ambient temperature, and the direction of the air cylinder is perpendicular to the cylinder rod axis. There were problems such as lack of rigidity because the load was directly applied, and it was difficult to detect when movement stopped halfway due to external force.

An object of the present invention is to provide an automatic friction measurement mechanism for a bearing, which can be operated by using only a power source.

[0012]

Means for Solving the Problems In order to achieve the above object, in an automatic friction measurement system for a bearing according to the present invention, an inner ring drive motor for driving an inner ring of a bearing, which is an object to be measured, and a bearing are held. , A probe and a load detection unit that detect the friction of the bearing, a linear guide bearing with a rubber sheet adhered to the side surface that positions the load detection unit at the measurement position, and a small DC motor that drives the linear guide bearing. And an abnormality detection circuit for detecting an overcurrent of the small DC motor.

[0013]

[Action]

 By using a small DC motor as the drive source, it is possible to operate in a laboratory or factory with only an electric power source without an air source.

[0014]

【Example】

 Next, the present invention will be described with reference to the drawings.

FIG. 1 (a) is a plan view showing an embodiment of the present invention, FIG. 1 (b) is a front view thereof, and FIG. 1 (c) is a view taken along the line AA of FIG. 1 (b). FIG. 2 and FIG. 2 are principle diagrams of the motor drive circuit.

In the figure, the outer ring of the bearing 19 as the object to be measured and the arm 18 are integrated, and the shaft with slotted groove 22 is press-fitted into the inner ring of the bearing 19 to be integrated, and the end of the grooved shaft 22 is There is a slot on the other side and there is a center hole on the opposite side.

Both ends of the shaft 22 are held by a shaft and a male center 28 of the inner-wheel drive motor 20 in which the shaft end portion is processed into a convex shape. The arm 18 and the probe 17 are in point contact with each other. The probe 17 is a part of the components of the load detection unit 16.

The load detection unit 16 is fixed to the moving table 1, the moving side linear guide bearing 10 is fixed to the table 1, and the fixed side linear guide bearing 9 is fixed to the sub base 2. One set of both is a commercial item (for example, according to THK LS2050 Catalog No. 100-1 page 235).

A connecting stud 3 is fixed to the sub-base 2 and fixed to a base 4. A right stopper 5, a left stopper 6, a right detection sensor 21 and a left detection sensor 7 are fixed to both ends of the sub-base 2. Has been done.

A small DC motor 11 is fixed to the sub-base 2 via a motor mounting bracket 12, and a shaft 14 of the small DC motor 11 is protected by a shaft protection block 13 fixed to the sub-base 2. ..

A sensor dog 8 is fixed to the lower surface of the moving table 1, and a rubber sheet 15 is adhered to the moving side linear guide bearing 10 so as to make frictional contact with the shaft 14. Further, the abnormality detection circuit 27 shown in FIG. 2 is connected to the power supply circuit of the small DC motor 11. In FIG. 2, 28 is an abnormality detection signal, 29 is a voltage regulator, and 30 is a DC stabilized power supply.

Next, the operation will be described.

A part of the rotational force of the inner-wheel drive motor 20 is transmitted as friction to the outer ring of the bearing 19, which is the object to be measured, via the grooved shaft 22, and becomes the rotational force of the arm 18. The rotational force of the arm 18 is When it comes into contact with the probe 17, it is transmitted to the load detection unit 16 to be detected and measured.

The load detection unit 16 linearly rotates by a frictional force between the shaft 14 of the small DC motor 11 and the rubber sheet 15 via the moving-side linear guide bearing ring 10 fixed to the sub-base 2 and the rubber sheet 15. It is transmitted after being converted to and is moved to the left and right to be positioned.

When the moving table 1 moves to the left and hits the left stopper 6 to detect the dog 8 by the left detection sensor 7, the inner wheel drive motor 20 rotates counterclockwise and friction is transmitted to the load detection unit 16. When the measurement is started and the measurement is completed, the rotation direction of the shaft 14 of the small DC motor 11 is reversed, the table 1 moves from left to right, hits the right stopper 5, and the right detection sensor 21 detects the sensor dog 8. As a result, the signal of the small DC motor 11 is cut off and stopped.

At this time, when an external force that hinders left and right movement is applied to the table 1, the probe 17, etc., an overcurrent flows through the small DC motor 11 and the abnormality detection circuit 27 operates to output an abnormality detection signal 31.

When a force equal to or greater than the frictional force between the rubber sheet 15 and the shaft 14 is applied, the rubber sheet 15 and the shaft 14 slip and protect the probe 17 and the load detection unit 16.

[0028]

[Effect of the device]

 As described above, the present invention uses a small DC motor as a drive source, so that it can be used only as a power source, so it can be operated even in a laboratory or factory without an air source, and the power source is a stabilized power source. By using, the probe moving speed is not affected by the ambient temperature.

Further, since the linear motion bearing is used, rigidity can be imparted to the external force in the direction perpendicular to the axis, and since the load unit is not vibrated, stable measurement can be performed and the motor circuit Anomalies such as overload can be detected by detecting the current that flows in.

[Brief description of drawings]

FIG. 1A is a plan view showing an embodiment of the present invention,
(B) is the same front view, (c) is an AA arrow view of (b).

FIG. 2 is a principle diagram of a motor drive circuit.

FIG. 3A is a plan view showing a conventional example, and FIG. 3B is a front view thereof.

[Explanation of symbols]

 1 moving table 2 sub base 3 connecting stud 4 base 5 right stopper 6 left stopper 7 left detection sensor 8 dog 9 fixed side linear guide bearing 10 moving side linear guide bearing 11 small DC motor 12 motor mounting bracket 13 shaft protection block 14 shaft 15 Rubber sheet 16 Load detection unit 17 Probe 18 Arm 19 Bearing 20 Inner ring drive motor 21 Right detection sensor 22 Shaft with shaft groove 23 Linear guide cylinder block 24 Linear guide cylinder block 25 Cylinder body 26 Air tube 27 Abnormality detection circuit 28 Male center 29 Voltage Regulator 30 DC stabilized power supply 31 Abnormality detection signal

Claims (1)

[Scope of utility model registration request] 1. An inner ring drive motor for driving a bearing inner ring, which is an object to be measured, a male center for holding the bearing, a probe and a load detection unit for detecting friction of the bearing, and a load detection unit at a measurement position. A friction guide automatic bearing characterized by having a linear guide bearing with a rubber sheet adhered to the side surface to be positioned, a small DC motor for driving the linear guide bearing, and an abnormality detection circuit for detecting an overcurrent of the small DC motor. Measuring mechanism.