CN208091696U - The rolling bearing fatigue life pilot system of radially alternating load can be applied - Google Patents

Abstract

The utility model relates to a rolling bearing fatigue life test system capable of applying radial alternating loads. The system controls the rotation of the driving motor through a computer to drive the rolling bearings to run at a given speed. In the radial alternating load loading unit, through The displacement of the linear motor affects the stretching/compression of the spring. Due to the change of the stretching/compression of the spring, the spring will be able to exert a force of different sizes and directions on the surface of the movable fixture. By adding Multiple radial alternating load loading units can realize the radial alternating load loading of the bearing, and the torque meter and temperature sensor can be used to detect the performance of the rolling bearing during operation. Compared with the prior art, the utility model can realize the radial alternating load loading of the rolling bearing, and carry out the fatigue life test of the rolling bearing in combination with the real working conditions of the internal combustion engine. The utility model not only has a simple structure, saves space, but also has more precise and direct control.

Description

Rolling bearing fatigue life test system capable of applying radial alternating load

technical field

The utility model belongs to the field of engine rolling bearing life tests, and relates to a rolling bearing fatigue life test system capable of applying radial alternating loads.

Background technique

Internal combustion engines are widely used in automobiles, ships, airplanes, tanks, railway locomotives, agricultural machinery, construction machinery, generator sets and other industries. As power equipment, they occupy a very important position in the national economy. The internal combustion engine includes several important friction pairs such as piston-cylinder liner, piston ring-cylinder liner, crankshaft-bearing and cam-tappet. Among them, the crankshaft bearing, including the main bearing and the connecting rod bearing (due to the working load of this type of bearing The size and direction of the internal combustion engine change with time, so it is usually called a dynamic load bearing), which is one of the most critical friction pairs of the internal combustion engine. It not only affects the reliability and fatigue life of the internal combustion engine, but also affects the potential for further strengthening of the internal combustion engine.

At present, the main bearings, camshaft bearings and connecting rod big end bearings of automobile engines mainly use sliding bearings, and the camshaft bearings of a few engines use rolling bearings. According to the theory of tribology, the energy loss of rolling friction is about an order of magnitude smaller than that of sliding friction. Therefore, under the same working conditions, the friction loss of rolling bearings is much smaller than that of sliding bearings, so bearing rolling has become an important attempt to reduce friction and consumption of engines.

The fatigue life and reliability of rolling bearings are the most important performance indicators of rolling bearings. However, due to too many factors affecting fatigue life and the theory of bearing fatigue life still needs to be perfected, life testing is the only effective way at present. Bearing test is an important verification process that is indispensable in the bearing design and manufacturing process. The load of the test bearing is an important parameter in the test of the bearing testing machine, and its accuracy directly affects the test results of the bearing. At present, the traditional rolling bearing test system has single loading characteristics and cannot realize variable load loading. In real internal combustion engines, dynamic rolling bearings are often under alternating loads. Therefore, it is difficult for traditional rolling bearing test systems to carry out fatigue life tests of engine dynamic rolling bearings.

Contents of the invention

The purpose of this utility model is to provide a rolling bearing fatigue life test system that can apply radial alternating loads in order to overcome the above-mentioned defects in the prior art.

The purpose of this utility model can be achieved through the following technical solutions:

A rolling bearing fatigue life test system capable of applying radial alternating loads, used to measure the fatigue life of rolling bearings under radial alternating loads, the rolling bearings are composed of outer rings, inner rings and inner rings distributed through cage Composed of multiple rolling elements between the outer ring and the outer ring, the system includes,

working platform,

drive motor, connected to the working platform,

The rotating shaft is connected with the drive motor, and the rotating shaft is provided with a torque meter,

Fixing fixture A and fixing fixture B are connected on the working platform, and each fixing fixture holds a test rolling bearing in it,

The movable fixture is located between the fixed fixture A and the fixed fixture B, and is composed of an upper movable sub-fixture and a lower movable sub-fixture. The movable fixture holds at least one rolling bearing under test, and the rolling bearing under test It is arranged coaxially with the accompanying rolling bearing, and both are sleeved on the rotating shaft.

The temperature sensor is set in the movable fixture and is in contact with the tested rolling bearing,

The radial alternating load loading unit is composed of four loading components acting on the movable fixture. Each loading component is composed of a linear motor connected in sequence, a load loading spring and a connector. The connector is connected with the movable fixture. The loading springs of the four loading components are arranged in a "ten" shape, and the expansion and contraction direction of each loading spring is in the radial direction of the rotating shaft. The linear motor is driven by a magnetic track and a thrust connected to the magnetic track. Composed of coils, the thrust coil is fixed on the working platform, one end of the magnetic track is connected to the load loading spring, and the length direction of the magnetic track is consistent with the stretching direction of the load loading spring.

Preferably, two rolling bearings to be tested are clamped in the movable fixture.

Preferably, the bottom of the upper movable sub-fixture is provided with an upper arc-shaped groove, and the top of the lower movable sub-fixture is provided with a lower arc-shaped groove, and the combination of the upper arc-shaped groove and the lower arc-shaped groove matches the rolling bearing clamping part, the radial alternating load loading unit is composed of an upper loading assembly, a lower loading assembly, a left loading assembly and a right loading assembly, and the upper loading assembly is arranged above the upper movable sub-fixture and acts on The top of the upper movable sub-fixture, the lower loading assembly is arranged under the lower movable sub-fixture and acts on the bottom of the lower movable sub-fixture, and the left loading assembly is arranged on the left side of the movable fixture and acts on the upper movable sub-fixture and the joint of the lower movable clamp, the right loading assembly is arranged on the right side of the movable clamp and acts on the joint of the upper movable clamp and the lower movable clamp.

Preferably, the temperature sensor is arranged in the upper arc groove or the lower arc groove, and is in contact with the outer ring of the rolling bearing.

Preferably, the rotating shaft is in drive connection with the drive motor through a coupling.

Preferably, the system further includes a controller communicated with the driving motor, the temperature sensor, the torque meter and the linear motor respectively.

Preferably, the system further includes an oil supply mechanism for providing lubricating oil for the rolling bearings to be tested and the rolling bearings to be tested, and the said oil supply mechanism is communicated with the controller.

The working principle of the utility model is:

The computer (controller) controls the rotation of the drive motor to drive the rolling bearing to run at a given speed. In the radial alternating load loading unit, the change of the displacement of the linear motor is controlled by a computer, and the change of the displacement of the linear motor can affect the stretching/compression of the spring. Due to the change of the tension/compression of the spring, the spring will be able to exert a force of different magnitudes and variable directions on the surface of the movable fixture. The alternating load of the radial bearing can be realized by adding multiple radial alternating load loading units in different regions of the movable fixture. The computer controls the oil supply during the operation of the rolling bearing through the oil supply mechanism, and the torque meter and temperature sensor can be used to detect the performance of the rolling bearing during operation.

Compared with the prior art, the utility model has the following beneficial effects:

(1) The displacement of the linear motor is controlled by the computer, and then the compression/stretching of the spring is changed to control the spring force of the spring, so that the radial alternating load of the bearing can be loaded.

(2) Combined with the real working conditions of the internal combustion engine, the real working load of the internal combustion engine can be loaded by controlling the displacement and time variation of the linear motor by the computer. The use of this test system is helpful to carry out the fatigue life test of the dynamic load rolling bearing of the engine.

(3) The linear motor directly controls the expansion and contraction of the loaded spring, which not only has a simple structure and saves space, but also has a more precise and direct control.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a schematic diagram of the radial alternating load loading unit of the present invention.

In the figure, 1 is a computer, 2 is a driving motor, 3 is a coupling, 4 is a torque meter, 5 is a fixed fixture A, 6 is an oil supply mechanism, 7 is a radial alternating load loading unit, and 8 is a movable fixture. 81 is the upper movable sub-fixture, 82 is the lower movable sub-fixture, 9 is the fixed fixture B, 10 is the rotating shaft, 11 is the accompanying rolling bearing B, 12 is the tested rolling bearing B, 13 is the tested rolling bearing A, 14 is the accompanying test Rolling bearing A, 15 is a working platform, 16 is a temperature sensor, 17 is a magnetic track, 18 is a thrust coil, 19 is a load spring, and 20 is a connector.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example 1

A rolling bearing fatigue life test system that can apply radial alternating loads, as shown in Figure 1-2, is used to measure the fatigue life of rolling bearings under radial alternating loads. The frame is composed of multiple rolling elements distributed between the inner ring and the outer ring. The system includes,

working platform 15,

Drive motor 2 is connected on the work platform 15,

The rotating shaft 10 is connected to the driving motor 2, preferably through a coupling 3, and the rotating shaft 10 is provided with a torque meter 4.

The fixed fixture A5 and the fixed fixture B9 are connected on the working platform 15. The fixed fixture A5 holds the test rolling bearing A14, and the fixed fixture B9 holds the test rolling bearing B11, the test rolling bearing A 14 and the test rolling bearing B 11 play the role of supporting the rotating shaft 10,

The movable fixture 8 is located between the fixed fixture A5 and the fixed fixture B9, and is composed of an upper movable sub-fixture 81 and a lower movable sub-fixture 82 opposed up and down, and at least one rolling bearing to be tested is clamped in the movable fixture 8. In this embodiment Two tested rolling bearings are clamped, which are the tested rolling bearing A13 and the tested rolling bearing B12 respectively. The tested rolling bearing and the accompanying test rolling bearing are arranged coaxially and are both sleeved on the rotating shaft 10.

The temperature sensor 16 is arranged in the movable fixture 8 and is in contact with the tested rolling bearing,

The radial alternating load loading unit 7 is composed of four loading assemblies acting on the movable fixture 8, and each loading assembly is composed of a linear motor connected in sequence, a load loading spring 19 and a connector 20, and the connector 20 is connected to the movable fixture 8 connections, the load loading springs 19 of the four loading assemblies are arranged in a "ten" shape, and the stretching direction of each load loading spring 19 is on the radial direction of the rotating shaft 10. The linear motor is composed of a magnetic track 17 and a magnetic track 17 is composed of a thrust coil 18 that is connected by transmission. The thrust coil 18 is fixed on the working platform 15. One end of the magnetic track 17 is connected with the load loading spring 19, and the length direction of the magnetic track 17 is consistent with the stretching direction of the load loading spring 19.

The bottom of the upper movable sub-fixture 81 of this embodiment is provided with an upper arc-shaped groove, and the top of the lower movable sub-fixture 82 is provided with a lower arc-shaped groove. The temperature sensor 16 is set in the upper arc groove or the lower arc groove, and is in contact with the outer ring of the rolling bearing. The radial alternating load loading unit 7 is composed of an upper loading assembly, a lower loading assembly, a left loading assembly and a right loading assembly, the upper loading assembly is arranged on the top of the upper movable sub-grip 81 and acts on the top of the upper movable sub-grid 81, the lower The loading assembly is arranged under the lower movable sub-clamp 82 and acts on the bottom of the lower movable sub-clamp 82, and the left loading assembly is arranged on the left side of the movable clamp 8 and acts on the joint of the upper movable sub-clamp 81 and the lower movable sub-clamp 82, The right loading assembly is arranged on the right side of the movable clamp 8 and acts on the junction of the upper movable sub-clamp 81 and the lower movable sub-clamp 82 .

The system also includes a controller connected to the drive motor 2, the temperature sensor 16, the torque meter 4 and the linear motors respectively. The controller can use a computer 1, and the temperature sensor 16 and the torque meter 4 can collect signals during the operation of the rolling bearing. To monitor the running status of the rolling bearings, the system also includes an oil supply mechanism 6 for providing lubricating oil for each of the rolling bearings to be tested and the rolling bearings to be tested. The oil supply mechanism 6 communicates with the controller to realize oil supply to the rolling bearings.

The computer (controller) controls the rotation of the drive motor to drive the rolling bearing to run at a given speed. In the radial alternating load loading unit, the change of the displacement of the linear motor is controlled by a computer, and the change of the displacement of the linear motor can affect the stretching/compression of the spring. Due to the change of the tension/compression of the spring, the spring will be able to exert a force of different magnitudes and variable directions on the surface of the movable fixture. The alternating load of the radial bearing can be realized by adding multiple radial alternating load loading units in different regions of the movable fixture. The computer controls the oil supply during the operation of the rolling bearing through the oil supply mechanism, and the torque meter and temperature sensor can be used to detect the performance of the rolling bearing during operation.

The above descriptions of the embodiments are for those of ordinary skill in the art to understand and use the invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments, and apply the general principles described here to other embodiments without creative efforts. Therefore, the utility model is not limited to the above-mentioned embodiments, and improvements and modifications made by those skilled in the art according to the disclosure of the utility model without departing from the category of the utility model should be within the protection scope of the utility model.

Claims (7)

1. a kind of rolling bearing fatigue life pilot system applying radially alternating load, for measuring rolling bearing in radial direction Fatigue life under alternate load effect, the rolling bearing by outer ring, inner ring and by retainer be distributed in inner ring and Multiple rolling elements composition between outer ring, which is characterized in that the system includes,

Workbench (15),

Driving motor (2) is connected on workbench (15),

Rotary shaft (10) is sequentially connected with driving motor (2), and the rotary shaft (10) is equipped with torquemeter (4),

Stationary fixture A (5) and stationary fixture B (9), is connected on workbench (15), and one is clamped in each stationary fixture and accompanies Rolling bearing is tried,

Floating holder (8), between stationary fixture A (5) and stationary fixture B (9), by opposed upper activity divide fixture (81) and Lower activity divides fixture (82) to form, and at least one subject rolling bearing, the subject are clamped in the floating holder (8) Rolling bearing and examination rolling bearing coaxial arrangement is accompanied, and is set in rotary shaft (10),

Temperature sensor (16), setting contact in floating holder (8), and with subject rolling bearing,

Radially alternating load loading unit (7), the charging assembly acted on floating holder (8) by four form, each load group Part is made of the linear motor, load loading spring (19) and connector (20) being sequentially connected successively, the connector (20) It is connect with floating holder (8), the load loading spring (19) of four charging assemblies is in " ten " set up of character patt ern, and each load loads bullet The telescopic direction of spring (19) rotary shaft (10) in the radial direction, the linear motor is by track (17) and and track (17) thrust coil (18) composition being sequentially connected, the thrust coil (18) are fixed on workbench (15), track (17) one end is connect with load loading spring (19), and the length direction of track (17) and load loading spring (19) are flexible Direction is consistent.

2. the rolling bearing fatigue life pilot system according to claim 1 for applying radially alternating load, feature It is, two subject rolling bearings is clamped in the floating holder (8).

3. the rolling bearing fatigue life pilot system according to claim 1 for applying radially alternating load, feature It is, the upper activity divides the bottom of fixture (81) to be equipped with upper arc groove, and the lower activity, which divides at the top of fixture (82), to be set There are lower arcuate slot, upper arc groove and lower arcuate slot with the clamping part to match with rolling bearing is combined into, described is radially alternating Load loading unit (7) is made of upper charging assembly, lower charging assembly, left charging assembly and right charging assembly, it is described upper plus Component setting is carried to divide the top of fixture (81) in upper activity and act on the top that upper activity divides fixture (81), the lower load Component setting divides the lower section of fixture (82) in lower activity and acts on the bottom that lower activity divides fixture (82), the left load group Part is arranged in the left side of floating holder (8) and acts on the junction that upper activity divides fixture (81) and lower activity divides fixture (82), The described right charging assembly setting is on the right side of floating holder (8) and acts on upper activity fixture (81) and lower activity is divided to divide fixture (82) junction.

4. the rolling bearing fatigue life pilot system according to claim 3 for applying radially alternating load, feature It is, the temperature sensor (16) setting contacts in upper arc groove or lower arcuate slot, and with the outer ring of rolling bearing.

5. the rolling bearing fatigue life pilot system according to claim 1 for applying radially alternating load, feature It is, the rotary shaft (10) is sequentially connected by shaft coupling (3) and driving motor (2).

6. the rolling bearing fatigue life pilot system according to claim 1 for applying radially alternating load, feature It is, which further includes communicating to connect respectively with driving motor (2), temperature sensor (16), torquemeter (4) and linear motor The controller connect.

7. the rolling bearing fatigue life pilot system according to claim 6 for applying radially alternating load, feature Be, the system further include for providing the oil supply mechanism (6) of lubricating oil to accompany examination rolling bearing and being tested rolling bearing, it is described Oil supply mechanism (6) connect with controller communication.