KR100189813B1 - Axial load draw device of a high velocity and high load bearing tester - Google Patents

Abstract

The present invention relates to an axial load application device of a high speed, high load bearing tester. An axial load applying device of the high speed, high load bearing tester includes a drive unit; A rotating shaft which is fired by the driving unit and inserted into the inner ring of the bearing to be tested; A bearing housing into which an outer ring of the bearing to be tested is inserted; A load applying member coupled to the bearing housing to apply a load in an axial direction; A load having a screw jack for converting the rotational motion of the second drive motor into a linear motion is connected so that the rotation ratio of the second drive motor and the second drive motor is less than 1 and the power of the second drive motor can be transmitted. Including the applicator, it is possible to perform tests with high loads even at high speeds up to the critical speed range of the test bearing, and to use a simple, low cost, easy to maintain and repair mechanical system, and more during the same test run time. Test results data can be obtained.

Description

Axial load applying device for high speed and high load bearing tester

1 is a schematic diagram of an axial load application device of a bearing tester according to the prior art.

2 is a schematic diagram of an axial load applying apparatus of a high speed, high load bearing tester according to an embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

1: rotating shaft 2: roller bearing

3: bearing housing 4: reaction load

5: hydraulic system 6, 35: coupling

7: motor 8: auxiliary thrust bearing

34: first drive motor 36 ', 36: ball bearing

37: shaft 38 ', 38: ball bearing housing

39: fixed member 40: second drive motor

41: belt 42: screw jack

43: spring 44: load application member

The present invention relates to an axial load applying device of a high speed, high load bearing tester, and more particularly, to install the test bearings facing each other when testing a high speed, high load bearing, and to apply the law of action and reaction to the outside of one test bearing. An axial load application device of a high speed, high load bearing tester for applying a load to a ring.

The axial load applying device of the high speed and high load bearing tester is used for the development and test evaluation of bearings rotating at high speed, such as those used in gas turbine engines, and the friction, wear, and lubrication characteristics of the high speed bearings. It is used in the field, and can be utilized for research and test evaluation of bearings used in developing high speed spindles for turbo machinery and machine tools.

One embodiment according to the prior art will be described as follows with reference to the accompanying drawings.

1 is a schematic view of an axial load applying device of a bearing tester according to the prior art, which applies a load by directly contacting a rotating shaft using hydraulic pressure in the axial direction of a rotating object.

Referring to FIG. 1, the axial load applying device of the bearing tester includes the following components.

The test roller bearing 2 is inserted into the rotating shaft 1 and tightly fixed, the bearing housing 3 receives the reaction load 4 supporting the roller bearing 2 and canceling the load transmitted in the axial direction, One end of the rotary shaft (1) and the coupling (6) are screwed and the other end is connected to the auxiliary thrust bearing (8), the hydraulic system (5) is connected to the auxiliary thrust bearing (8), the motor (7) and the coupling 6 is screwed.

At this time, in the axial direction. The applied load is transmitted to the test bearing through an auxiliary thrust bearing connecting the rotational movement of the shaft and the linear movement of the hydraulic system, and then receives the reaction load to cancel the applied load in the axial direction.

Such a device has the following problems.

First, secondary thrust bearings must be able to withstand high and high load conditions, but thrust bearings generally have a lower limit speed range than ball bearings for testing under the same load conditions.

Secondly, the hydraulic system for applying load to the shaft is always a problem of leakage and difficult to maintain and repair, and the hydraulic system with a precision controller is expensive.

Third, when two test bearings are installed, the force applied to the rotating shaft is twice the original force, so the above method can be used in the small load range, that is, the hydraulic operating range, but the hydraulic pressure is doubled in case of heavy load. To avoid this, it is necessary to redesign the contact with the auxiliary thrust bearing.

These problems ultimately make the selection and design of peripherals more difficult than the bearings to be tested. Such devices may be used for bearing tests at low speeds and low loads, but not for bearing tests with high speeds and loads.

The present invention has been made to solve the above problems, it is possible to perform the test while applying a high load even at a high speed up to the limit speed region of the test bearing, and maintenance and repair instead of a complicated and expensive hydraulic device difficult to maintain and repair It is an object of the present invention to provide an axial load application device for a high speed, high load bearing tester using a simple mechanical system that is easy to operate.

In order to achieve the above object, the axial load applying apparatus of the high speed, high load bearing tester according to the present invention,

Drive unit,

A rotating shaft rotated by the driving unit and inserted into the inner ring of the bearing to be tested;

A bearing housing into which the outer ring of the bearing to be tested is inserted;

A load applying member coupled to the bearing housing to apply a load in an axial direction;

A load having a screw jack for converting the rotational motion of the second drive motor into a linear motion is connected so that the rotation ratio of the second drive motor and the second drive motor is less than 1 and the power of the second drive motor can be transmitted. Characterized in that it comprises an application unit.

In the present invention, the drive unit,

It is preferred to include a first drive motor, and a flexible coupling installed between the first drive motor and the rotary shaft.

In the present invention,

It is preferable that a spring is provided between the load applying member and the screw jack to provide elasticity to the load applying member side with respect to the screw jack.

It is preferable that the connection for the same track transmission of the second drive motor and the screw jack is made by a belt.

Hereinafter, an embodiment according to the present invention with reference to the accompanying drawings will be described as follows.

2 is a schematic diagram of an axial load applying apparatus of a high speed and high load bearing tester according to a first embodiment of the present invention.

Components of the axial load applying apparatus of the high speed, high load bearing tester according to an embodiment of the present invention will be described as follows.

The flexible coupling 35 is coupled to the first drive motor 34, the rotating shaft 37 is screwed to the flexible coupling 35, and the same annular ball bearings 36 ′ and 36 are rotated shafts ( 37) is inserted into and fixed in close contact with each other and provided with a prosthetic ring, and the annular bearing housings 38 'and 38 support the annular ball bearings 36' and 36, and the fixing member 39 The left bearing housing 38 is fixed and a reaction load is applied to the left bearing housing 38.

The screw jack 42 is driven by the second drive motor 40 and the rotation ratio with the second drive motor 40 is less than 1, and converts the rotational motion of the second drive motor 40 into linear motion, and the belt 41 ) Transmits the driving force of the second driving motor 40 to the screw jack 42, the high rigidity spring 43 is connected to the screw jack 42, the load applying member 44 is connected to the spring 43 And only when the spring 43 is compressed, it contacts the outer ring of the right bearing 36 'to apply the load generated by the spring 43 to the outer ring of the right bearing 36'.

The operation of the axial load applying apparatus of the high speed, high load bearing tester according to the first embodiment of the present invention is as follows.

When the second driving motor 40 is operated, the driving force of the second driving motor 40 through the belt 42 is smaller than 1 so that the rotational ratio with the second driving motor 40 is smaller than the rotational speed of the second driving motor 40. The screw jack 42 is transmitted to the slowly rotating screw jack 42, and the screw jack 42 is advanced in the axial direction of the rotating shaft 37 to compress the high rigidity spring 43 that absorbs the vibration of the rotating shaft 37, thereby applying a load applying member ( The right bearing 44 contacts the outer ring of the right bearing 36 'only when the spring 43 is compressed to slide the axial load generated by the spring 43 along the base of the bearing tester (not shown). It is applied to the outer ring of the right bearing 36 'supported by the housing 38'. The load applied to the bearing 36 'is transmitted to the same size by the action and the reaction to the left bearing 36 installed opposite the bearing 36' so that both bearings 36 'and 36 can be tested at the same time. Will be.

At this time, the load applied to the left bearing 36 is transmitted to the right bearing housing 38, which loads the fixing member 39 which fixes the right bearing housing 38 and gives a reaction load to the right bearing housing 38. It is canceled by and disappears.

The effect of the axial load applying apparatus of the high speed, high load bearing tester according to the present invention is as follows.

First, since the thrust bearing having a lower limit speed than the high speed ball bearing is not used in the present invention, the test can be performed at a high speed up to the limit speed region of the test bearing, thereby ensuring accuracy and reliability in the test. have.

Second, a simple, low cost, easy to maintain and maintain mechanical system can be used.

Third, the applied load is reduced by half, so that twice the test result data can be obtained during the same test run time.

Although the present invention has been described with reference to one embodiment as shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (4)

A driving unit, a rotating shaft rotated by the driving unit and inserted into the inner ring of the bearing to be tested, a bearing housing into which the outer ring of the bearing to be tested is inserted, and a load applying member coupled to the bearing housing to apply a load in the axial direction; The second driving motor and the rotational ratio of the second driving motor is less than 1 and connected so that the power of the second driving motor can be transmitted to have a screw jack for converting the rotational motion of the second driving motor into linear motion An axial load application device for a high speed, high load bearing tester comprising a load application unit. The axial load applying apparatus of claim 1, wherein the driving unit includes a first driving motor and a flexible coupling installed between the first driving motor and the rotary shaft. . An axial load application device for a high speed, high load bearing tester, comprising: a spring provided between the load application member and the screw jack to provide resilience to the load application member side with respect to the screw jack. The axial load applying apparatus of claim 1, wherein a connection for power transmission between the second driving motor and the screw jack is made by a belt.