CN207866495U - Lead screw transmission loads the rolling bearing fatigue life pilot system of alternating load - Google Patents

Abstract

The utility model relates to a rolling bearing fatigue life test system with alternating loads driven by a screw drive. The system controls the rotation of a drive motor through a computer to drive the rolling bearing to run at a given speed. In the screw drive alternating load loading unit, The rotary motion of the rotary motor is converted into linear motion through the screw drive mechanism, which can affect the stretching/compression of the spring. Due to the change of the stretching/compression of the spring, the spring will be able to exert different sizes and directions on the surface of the movable fixture. Variable force, by adding multiple screw drive alternating load loading units in different areas of the movable fixture, the bearing alternating load can be loaded, and the torque meter and temperature sensor are used to detect the performance of the rolling bearing during operation. Compared with the prior art, the utility model can simply, conveniently and accurately realize the 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.

Description

Rolling bearing fatigue life test system with alternating loads driven by screw drive

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 which is driven by a screw and loaded with 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 with screw drive and alternating load 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 loaded with alternating loads driven by a screw, used to measure the fatigue life of rolling bearings under one-dimensional alternating loads. 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 screw drive alternating load loading unit is composed of two loading components acting on the movable sub-fixtures respectively. Each loading component is composed of a rotating motor connected in sequence, a screw drive mechanism, a load spring and a connector. The above-mentioned connector is connected with the movable fixture, and the load-loading springs of the two loading components are oppositely arranged in a "one" shape, and the expansion and contraction direction of each load-loading spring is in the radial direction of the rotating shaft. The transmission mechanism is composed of a worm, a ball nut and a lead screw. The lead screw is passed through the ball nut. The worm and the ball nut are engaged and connected by threads arranged on the outer surface of the ball nut. The worm and the ball nut It is fixed on the working platform through a fixing frame, the axial direction of the screw is consistent with the expansion and contraction direction of the loading spring, one end of the screw is connected to the loading spring through the screw connection plate, and the worm is connected to the rotating motor by transmission .

Preferably, the worm and the threads on the outer surface of the ball nut form a self-locking worm gear structure.

Preferably, each loading assembly is provided with two rotating motors, which are respectively connected to the two ends of the worm through clutch transmission.

Preferably, a rotary bearing is provided at the connection between the screw connection plate and the screw, and one end of the screw is rotatably connected to the screw connection plate through the rotation bearing.

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 screw drive alternating load loading unit is composed of an upper loading assembly and a lower loading assembly, 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.

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 rotating 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 screw drive alternating load loading unit, the rotation of the rotating motor is controlled by a computer, and the rotating motion of the rotating motor is converted into linear motion through the screw drive mechanism, which 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 loading of the bearing can be realized by adding multiple screw drive alternating load loading units in different areas 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) Control the rotation angle of the rotating motor through the computer (controller), and then change the compression/stretch of the spring to control the elastic force of the spring, which can realize the alternating load loading of the rolling bearing in two relative directions (such as the up and down direction) .

(2) Combined with the real working conditions of the internal combustion engine, the loading of the real working condition load of the internal combustion engine can be realized by controlling the rotation angle of the rotating electrical machine and the variation of time through the computer. Using the test system is helpful to carry out the engine dynamic load rolling bearing fatigue life test.

(3) The precision of screw transmission is high, which improves the accuracy of load loading.

(4) The use of the worm plays the role of deceleration and torque increase, which reduces the burden on the rotating motor, and a low-power rotating motor can be selected.

(5) When the worm and the rolling gear form a self-locking worm gear structure, the influence of the reaction force of the load loading spring on the load loading is avoided, and the accuracy of the load loading is further improved.

(6) The two ends of the lead screw are respectively connected to the rotating motors through clutches, which are used for rotation in different directions to realize the loading of alternating loads.

Description of drawings

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

Fig. 2 is a schematic structural view of the screw drive alternating load loading unit of the present invention;

Fig. 3 is the schematic diagram of screw transmission mechanism;

Fig. 4 is a schematic top view of the screw drive mechanism.

In the figure, 1 is a computer, 2 is a driving motor, 3 is a shaft coupling, 4 is a torque meter, 5 is a fixed fixture A, 6 is an oil supply mechanism, 7 is a screw drive alternating load loading unit, 71 is a worm, 72 is a ball nut, 73 is a screw, 74 is a rotary bearing, 75 is a connecting plate for a screw, 76 is a fixed frame, 8 is a movable fixture, 81 is an upper movable sub-fixture, 82 is a lower movable sub-fixture, and 9 is a 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 the working platform, 16 is the temperature sensor, 17 is the rotating motor, 18 is a load loading spring, and 19 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 loaded with alternating loads driven by a screw, as shown in Figures 1 to 3, is used to measure the fatigue life of rolling bearings under one-dimensional 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 screw drive alternating load loading unit 7 is composed of two loading assemblies acting on the movable sub-fixtures respectively. Each loading assembly is composed of a rotating motor 17, a screw transmission mechanism, a load loading spring 18 and a connector connected by sequential transmission. 19, the connector 19 is connected with the movable fixture 8, and the load springs 19 of the two loading components are oppositely arranged in the shape of "one", and the stretching direction of each load spring 18 is in the radial direction of the rotating shaft 10 , the screw transmission mechanism is composed of a worm 71, a ball nut 72 and a lead screw 73, the lead screw 73 is set in the ball nut 72, the worm 71 and the ball nut 72 are connected by thread engagement arranged on the outer surface of the ball nut 72, the worm 71 And the ball nut 72 is fixed on the working platform 15 by the fixed frame 76, the axial direction of the leading screw 73 is consistent with the telescopic direction of the load loading spring 18, and one end of the leading screw 73 is connected with the load loading spring 18 through the screw connecting plate 75, and the worm 71 is connected with rotating electrical machine 17 transmissions.

In this embodiment, each loading assembly is provided with two rotating motors 17, as shown in FIG. 4 , which are respectively connected to the two ends of the worm 71 through a clutch transmission. The thread on the outer surface of the worm 71 and the ball nut 72 forms a self-locking worm gear structure, and the connection between the screw connecting plate 75 and the screw 73 is provided with a rotary bearing 74, and one end of the screw 73 is connected to the screw by the rotary bearing 74. The connecting plate 75 is rotatably connected.

The bottom of the upper movable sub-fixture 81 in 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 upper arc-shaped groove and the lower arc-shaped groove cooperate to form a clamp that matches the rolling bearing. The holding part, the temperature sensor 16 is arranged in the upper arc groove or the lower arc groove, and is in contact with the outer ring of the rolling bearing. The screw drive alternating load loading unit 7 is composed of an upper loading assembly and a lower loading assembly. The upper loading assembly is arranged on the top of the upper movable sub-fixture 81 and acts on the top of the upper movable sub-fixture 81. The lower loading assembly is arranged on the lower movable sub-fixture. 82 and acts on the bottom of 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 each rotating motor in communication. The controller can use a computer 1, and the temperature sensor 16 and the torque meter 4 can collect signals during the running 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 controls the rotation of the drive motor to drive the rolling bearing to run at a given speed. In the screw drive alternating load loading unit, the rotation of the rotating motor is controlled by a computer, and the rotating motion of the rotating motor is converted into linear motion through the screw drive mechanism, which 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 loading of the bearing can be realized by adding multiple screw drive alternating load loading units in different areas 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 (10)

1. a kind of rolling bearing fatigue life pilot system of lead screw transmission load alternating load, for measuring rolling bearing one The fatigue life under alternate load effect is tieed up, the rolling bearing is distributed in inner ring by outer ring, inner ring and by retainer 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,

Lead screw transmission alternating load loading unit (7) is respectively acting on the charging assembly that each activity divides on fixture by two and forms, Each charging assembly is by the electric rotating machine (17), lead-screw drive mechanism, load loading spring (18) and the connector that are sequentially connected successively (19) it forms, the connector (19) is connect with floating holder (8), and the load loading spring (18) of two charging assemblies is in Line-styled is opposite disposed, the telescopic direction of each load loading spring (19) rotary shaft (10) in the radial direction, institute The lead-screw drive mechanism stated is made of worm screw (71), ball nut (72) and leading screw (73), and the leading screw (73) is threaded through rolling In pearl nut (72), screw thread of the worm screw (71) with ball nut (72) by setting in ball nut (72) lateral surface is nibbled Connection is closed, the worm screw (71) and ball nut (72) are fixed on by fixed frame (76) on workbench (15), described The axis direction of leading screw (73) is consistent with the telescopic direction of load loading spring (18), and one end of leading screw (73) is connected by leading screw Plate (75) is connect with load loading spring (18), and the worm screw (71) is sequentially connected with electric rotating machine (17).

2. the rolling bearing fatigue life pilot system of lead screw transmission load alternating load according to claim 1, special Sign is that the worm screw (71) and the screw thread of ball nut (72) lateral surface form self locking type worm gear-worm structure.

3. the rolling bearing fatigue life pilot system of lead screw transmission load alternating load according to claim 1, special Sign is, each charging assembly is set there are two electric rotating machine (17), and the both ends with worm screw (71) are connected by driven by clutches respectively It connects.

4. the rolling bearing fatigue life pilot system of lead screw transmission load alternating load according to claim 1, special Sign is that the junction of the leading screw connecting plate (75) and leading screw (73) is equipped with swivel bearing (74), the leading screw (73) One end pass through the swivel bearing (74) and leading screw connecting plate (75) and be rotatablely connected.

5. the rolling bearing fatigue life pilot system of lead screw transmission load alternating load according to claim 1, special Sign is, two subject rolling bearings are clamped in the floating holder (8).

6. the rolling bearing fatigue life pilot system of lead screw transmission load alternating load according to claim 1, special Sign is that the upper activity divides the bottom of fixture (81) to be equipped with upper arc groove, and the lower activity divides the top of fixture (82) Equipped with lower arcuate slot, upper arc groove and lower arcuate slot are passed with the clamping part to match with rolling bearing, the leading screw is combined into Dynamic alternating load loading unit (7) is made of upper charging assembly and lower charging assembly, and the upper charging assembly is arranged in upper work Dynamic to divide the top of fixture (81) and act on the top that activity divides fixture (81), the lower charging assembly is arranged in lower activity Divide the lower section of fixture (82) and acts on the bottom that lower activity divides fixture (82).

7. the rolling bearing fatigue life pilot system of lead screw transmission load alternating load according to claim 6, special Sign is that the temperature sensor (16) setting contacts in upper arc groove or lower arcuate slot, and with the outer ring of rolling bearing.

8. the rolling bearing fatigue life pilot system of lead screw transmission load alternating load according to claim 1, special Sign is that the rotary shaft (10) is sequentially connected by shaft coupling (3) and driving motor (2).

9. the rolling bearing fatigue life pilot system of lead screw transmission load alternating load according to claim 1, special Sign is, the system further include respectively with driving motor (2), temperature sensor (16), torquemeter (4) and electric rotating machine (17) Communicate the controller of connection.

10. the rolling bearing fatigue life pilot system of lead screw transmission load alternating load according to claim 9, special Sign is, which further includes for accompany examination rolling bearing and be tested the oil supply mechanism (6) that rolling bearing provides lubricating oil, institute The oil supply mechanism (6) stated is connect with controller communication.