1. A sliding bearing rotation testing machine capable of realizing temperature change, load change and speed change is characterized by comprising a frame, wherein a servo motor is fixed on a table board of the frame and is connected with a test shaft through a coupler, two ends of the test shaft are fixed with the table board through supporting seats provided with bearings, a floating seat is sleeved on the test shaft between the two supporting seats, a bearing seat is arranged in the floating seat, a tested sliding bearing is arranged in the bearing seat, a thermocouple is arranged on the floating seat, a load change radial pressurizing device is arranged on the outer edge of the floating seat, a cylindrical sleeve is fixed below the table board, an upward electric cylinder is fixed on the lower end face of the cylindrical sleeve, an inverted T-shaped connecting rod is fixed on the push rod head of the electric cylinder, a spring is sleeved on the connecting rod, an upper spring cushion plate is arranged on the spring, and a pressure sensor is arranged on the upper spring cushion plate, the push rod is arranged between the pressure sensor and the floating seat, the sealed high-low temperature variable temperature test box is arranged on the table board, the test elements except the servo motor on the table board are sealed, and the inlet and the outlet of cold and hot air are arranged on the variable temperature test box.

2. The sliding bearing rotation tester capable of realizing temperature change, load change and speed change of claim 1, wherein the top rod is inserted in the linear bearing.

3. The sliding bearing rotation testing machine capable of realizing temperature change, load change and speed change of claim 1, wherein a sealing gasket is arranged between the testing element and the table-board in the temperature change testing box.

4. The sliding bearing revolution testing machine capable of realizing temperature change, load change and speed change as claimed in claim 1, wherein two ends of the floating seat are respectively provided with two bearing seats, and the ejector rod is abutted against the middle part of the floating seat.

5. The use method of the sliding bearing rotation testing machine capable of realizing temperature change, load change and speed change is characterized in that: opening a temperature-changing test box, installing a tested sliding bearing in a bearing seat, installing the bearing seat at two ends of a floating seat respectively, enabling a test shaft to penetrate through the tested sliding bearing and bearings on two supporting seats, inserting a thermocouple into the floating seat for monitoring the temperature change of the tested sliding bearing during testing, closing the temperature-changing test box, setting the temperature of the temperature-changing test box, setting the radial force change range, adjusting the stroke and pressure of an electric cylinder through feedback information of a pressure sensor, and setting the rotation speed and frequency of a servo motor; starting the high-low temperature switch, starting the variable temperature test box, starting the servo motor after the temperature required by the test is reached, realizing variable speed rotation, starting the electric cylinder, and starting the variable load and/or variable speed test.

Background

The steering sliding bearing is mainly used for a steering part of a vehicle steering gear. During operation, the motor is usually operated under the condition of bearing radial force, and the performance of the product can directly influence the driving comfort. Therefore, the quality is required to be high, and the revolution life is an important index at the initial stage of development. The performance test is carried out by a common manufacturer during development and verification. The existing rotary testing machine cannot simultaneously realize the test conditions of variable temperature, variable load and variable speed, so that the test environment which is more accordant with the actual working condition cannot be simulated.

Disclosure of Invention

The invention aims to provide a sliding bearing rotation testing machine which has comprehensive simulated working conditions, simple structure and low manufacturing cost and can realize temperature change, load change and speed change and a using method thereof.

In order to achieve the requirements, the invention relates to a sliding bearing rotation testing machine capable of realizing temperature change, load change and speed change, which is characterized by comprising a frame, wherein a servo motor is fixed on a table top of the frame, the servo motor is connected with a testing shaft through a coupler, two ends of the testing shaft are fixed with the table top through supporting seats provided with bearings, a floating seat is sleeved on the testing shaft between the two supporting seats, a bearing seat is installed in the floating seat, a tested sliding bearing is installed in the bearing seat, a thermocouple is installed on the floating seat, a load change radial pressurizing device is arranged on the outer edge of the floating seat, a cylindrical sleeve is fixed below the table top, an upward electric cylinder is fixed on the lower end surface of the cylindrical sleeve, an inverted T-shaped connecting rod is fixed at the head part of a push rod of the electric cylinder, a spring is sleeved on the connecting rod, and an upper cushion plate of the spring is installed on the spring, the upper spring backing plate is provided with a pressure sensor, an ejector rod is arranged between the pressure sensor and the floating seat, the table board is provided with a sealed high-low temperature variable temperature test box, test elements except the servo motor on the table board are sealed, and the variable temperature test box is provided with an air inlet and an air outlet for cold and hot air.

The top rod is inserted in the linear bearing.

And a sealing gasket is arranged between the test element and the table board in the temperature-changing test box.

Two ends of the floating seat are respectively provided with two bearing seats, and the ejector rod is propped against the middle part of the floating seat.

A use method of a sliding bearing rotation testing machine capable of realizing temperature change, load change and speed change is characterized in that: opening a temperature-changing test box, installing a tested sliding bearing in a bearing seat, installing the bearing seat at two ends of a floating seat respectively, enabling a test shaft to penetrate through the tested sliding bearing and bearings on two supporting seats, inserting a thermocouple into the floating seat for monitoring the temperature change of the tested sliding bearing during testing, closing the temperature-changing test box, setting the temperature of the temperature-changing test box, setting the radial force change range, adjusting the stroke and pressure of an electric cylinder through feedback information of a pressure sensor, and setting the rotation speed and frequency of a servo motor; starting the high-low temperature switch, starting the variable temperature test box, starting the servo motor after the temperature required by the test is reached, realizing variable speed rotation, starting the electric cylinder, and starting the variable load and/or variable speed test.

According to the sliding bearing rotation testing machine capable of realizing temperature change, load change and speed change and the using method thereof, the temperature change, load change and speed change can be integrally completed through the combination of the temperature change testing box, the electric cylinder and the servo motor. The high-low temperature change is realized through the temperature-changing test box, the load change of the tested sliding bearing is realized through the jacking action of the electric cylinder, the speed change and the rotary motion of different steering are realized through the connection of the coupler by the servo motor on the test shaft, and the test shaft has the characteristics of temperature change, load change and speed change. The equipment has the advantages of reasonable design, exquisite structure, extremely strong performance and cost advantage.

Drawings

FIG. 1 is a front view of a sliding bearing rotation tester with variable temperature, load and speed;

FIG. 2 is an enlarged view of a portion of the area F in FIG. 1;

fig. 3 is a left side view of fig. 1.

In the figure: 1. a frame; 2. a table top; 3. a servo motor; 4. a coupling; 5. a test shaft; 6. a bearing; 7. a supporting seat; 8. a floating seat; 9. a bearing seat; 10. the sliding bearing to be tested; 11. a thermocouple; 12. a cylindrical sleeve; 13. an electric cylinder; 14. a push rod; 15. a connecting rod; 16. a spring; 17. a spring upper backing plate; 18. a pressure sensor; 19. a top rod; 20. a linear bearing; 21. a temperature-changing test chamber; 22. a gasket; 23. an air inlet; 24. and (7) an exhaust port.

Detailed Description

The invention is further described with reference to the following figures and specific embodiments.

Fig. 1 to 3 are structural diagrams of a sliding bearing revolution tester capable of realizing temperature change, load change and speed change. It is seen from the figure that the test device comprises a frame 1, a servo motor 3 is fixed on a table top 2 of the frame 1, the servo motor 3 is connected with a test shaft 5 through a coupling 4, two ends of the test shaft 5 are fixed with the table top 2 through support seats 7 provided with bearings 6, a floating seat 8 is sleeved on the test shaft 5 between the two support seats 7, two bearing seats 9 are installed in the floating seat 8, a tested sliding bearing 10 is installed in each bearing seat 9, a thermocouple 11 is installed on the floating seat 8, a load-changing radial pressurizing device is arranged on the outer edge of the floating seat 8, a cylindrical sleeve 12 is fixed below the table top 2, an upward electric cylinder 13 is fixed on the lower end face of the cylindrical sleeve 12, a reverse T-shaped connecting rod 15 is fixed at the head of a push rod 14 of the electric cylinder 13, a spring 16 is sleeved on the connecting rod 15, a spring upper cushion plate 17 is installed on the spring 16, a pressure sensor 18 is arranged on the spring upper backing plate 17, a mandril 19 is arranged between the pressure sensor 18 and the floating seat 8, and the mandril 19 is propped against the middle part of the floating seat 8. The top rod 19 is inserted into the linear bearing 20 to ensure that the top rod 19 can stably move up and down in the axial direction without turning over. A sealed high-low temperature variable-temperature test box 21 is arranged on the table board 2, test elements except the servo motor 3 on the table board 2 are sealed, and a sealing gasket 22 is arranged between the test elements in the variable-temperature test box 21 and the table board. The temperature change test chamber 21 is provided with an air inlet 23 and an air outlet 24 for cold and hot air, and is used for connecting cold and hot pipes.

A use method of a sliding bearing rotation testing machine capable of realizing temperature change, load change and speed change comprises the following steps: opening a temperature-changing test box 21, installing the tested sliding bearing 10 in a bearing seat 9, installing the bearing seat 9 at each of two ends of a floating seat 8, enabling a test shaft 5 to penetrate through the tested sliding bearing 10 and bearings 6 on two supporting seats 7, inserting a thermocouple 11 into the floating seat 8, monitoring the temperature change of the tested sliding bearing 10 during testing, closing the temperature-changing test box 21, setting the temperature of the temperature-changing test box 21, setting the radial force change range, adjusting the stroke and pressure of an electric cylinder 13 through feedback information of a pressure sensor 18, and setting the rotation speed and frequency of a servo motor 3; starting the high-low temperature switch, starting the variable temperature test box 21, starting the servo motor 3 after the temperature required by the test is reached, realizing variable speed rotation, starting the electric cylinder, and starting the variable load and/or variable speed test.

It should be understood that the above examples are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. All changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.