CN208091695U - Lead screw transmission loads the rolling bearing fatigue life experimental rig of radially alternating load - Google Patents

Abstract

The utility model relates to a rolling bearing fatigue life test device loaded with a radial alternating load driven by a screw drive. The device controls the rotation of a drive motor through a computer to drive the rolling bearing to run at a given speed. In the 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 a large and small force on the surface of the movable fixture. For different, direction-variable forces, the bearing alternating load can be loaded by adding multiple screw drive radial alternating load loading units in different areas of the movable fixture. The torque meter and temperature sensor are used to detect the rolling bearing during operation. performance. Compared with the prior art, the utility model can accurately 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.

Description

Rolling bearing fatigue life test device loaded with radial alternating load 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 device loaded with a radial alternating load driven by a lead screw.

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 device has a single loading characteristic and cannot realize the loading of variable loads. In real internal combustion engines, dynamic rolling bearings are often under alternating loads. Therefore, it is difficult for traditional rolling bearing test devices 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 device with a screw drive loaded with 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 device loaded with radial alternating loads driven by a screw is used to measure the fatigue life of rolling bearings under radial alternating loads. Composed of multiple rolling elements between the inner and outer rings, the device 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 radial alternating load loading unit is composed of four loading components acting on the movable fixture. Each loading component is composed of a rotating motor connected in sequence, a screw drive mechanism, a load loading spring and a connector. The connector is connected with the movable fixture, and the load springs of the four loading components are set in the shape of a "ten", and the expansion and contraction direction of each load spring is in the radial direction of the rotation axis. The screw drive mechanism is composed of 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 connected through thread engagement provided on the outer surface of the ball nut, and the worm and the ball nut pass through the fixing frame Fixed on the working platform, 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 connecting plate of the screw, and the worm is connected to the rotating motor by transmission.

Preferably, the worm and the outer thread of the ball thread form a self-locking worm gear structure.

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 The clamping part of the screw drive 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 act on the top of the upper movable fixture, the lower loading assembly is arranged under the lower movable fixture and acts on the bottom of the lower movable fixture, and the left loading assembly is arranged on the left side of the movable fixture and acts on the upper At the junction of the movable sub-fixtures and the lower movable sub-fixtures, the right loading assembly is arranged on the right side of the movable sub-fixtures and acts on the junction of the upper movable sub-fixtures and the lower movable sub-fixtures.

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 device further includes a controller communicated with the driving motor, the temperature sensor, the torque meter and the rotating motor respectively.

Preferably, the device also includes an oil supply mechanism for providing lubricating oil for the rolling bearings under test and the rolling bearings under test, and the oil supply mechanism is connected with the controller in communication.

The working principle of the utility model is:

The computer controls the rotation of the drive motor to drive the rolling bearing to run at a given speed. In the screw drive radial 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 of the bearing can be realized by adding multiple screw drive radial 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 a computer (controller), and then change the compression/stretch of the spring to control the spring force of the spring, so that the alternating load of the rolling bearing in the radial direction can be loaded.

(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 device is helpful to carry out the fatigue life test of the dynamic load rolling bearing of the engine.

(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.

Description of drawings

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

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

Fig. 3 is the structural representation of the lead screw transmission mechanism of the present utility model:

Fig. 4 is a schematic top view of the screw transmission mechanism of the present invention.

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 radial alternating load loading unit, 71 is Worm screw, 72 is a ball nut, 73 is a leading screw, 74 is a rotary bearing, 75 is a screw connecting plate, 76 is a fixed frame, 8 is a movable clamp, 81 is an upper movable sub-fixture, 82 is a lower movable sub-fixture, and 9 is a Fixture B, 10 is the rotating shaft, 11 is the rolling bearing B to accompany the test, 12 is the rolling bearing B to be tested, 13 is the rolling bearing A to be tested, 14 is the rolling bearing A to accompany the test, 15 is the working platform, 16 is the temperature sensor, 17 is the rotating The motor, 19 is a load loading 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 device loaded with radial alternating loads driven by a screw is used to measure the fatigue life of rolling bearings under radial alternating loads. Composed of multiple rolling elements between the inner and outer rings, the device 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 opposite up and down. The movable fixture 8 holds at least one rolling bearing to be tested. In the embodiment, two tested rolling bearings are clamped, namely the tested rolling bearing A13 and the tested rolling bearing B12. 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 radial alternating load loading unit 7 is composed of four loading components acting on the movable fixture, and each loading component is composed of a rotating motor 17, a screw drive mechanism, a load loading spring 19 and a connector 20 connected in sequence. Composition, the connector 20 is connected with the movable fixture 8, the loading springs 19 of the four loading components are arranged in the shape of a "ten", and the expansion and contraction directions of each loading spring 19 are in the radial direction of the rotating shaft 10 , the screw drive mechanism is composed of a worm 71, a ball nut 72 and a screw 73, the screw 73 is set in the ball nut 72, the worm 71 and the ball nut 72 are arranged on the ball nut 72 The threaded engagement connection of the outer surface, the worm 71 and the ball nut 72 are fixed on the working platform 15 through the fixed frame 76, the axis direction of the screw 73 is consistent with the telescopic direction of the load loading spring 19, and the screw 73 One end is connected to the loading spring 19 through the lead screw connecting plate 75 , and the worm 71 is in drive connection with the rotating motor 17 .

In this embodiment, each loading assembly is provided with a rotating motor 17, as shown in Figure 4, and the loading of the alternating load is realized through the forward and reverse rotation of the rotating motor 17, and the thread on the outer surface of the worm 71 and the ball nut 72 forms The self-locking worm gear structure, and the connection between the lead screw connecting plate 75 and the lead screw 73 is provided with a rotating bearing 74 , and one end of the leading screw 73 is rotatably connected with the lead screw connecting plate 75 through the rotating bearing 74 .

In this embodiment, the bottom of the upper movable sub-clamp 81 is provided with an upper arc-shaped groove, and the top of the lower movable sub-clamp 82 is provided with a lower arc-shaped groove, and the upper arc-shaped groove and the lower arc-shaped groove cooperate to form a rolling bearing For the matching clamping part, the temperature sensor 16 is arranged in the upper arc-shaped groove or the lower arc-shaped groove, and is in contact with the outer ring of the rolling bearing. The screw drive 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. The upper loading assembly is arranged above the upper movable sub-grip 81 and acts on the upper The top of the movable sub-clamp 81, the lower 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 described left loading assembly is arranged on the left side of the movable clamp 8 and acts on the upper At the joint of the 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 joint of the upper movable sub-clamp 81 and the lower movable sub-clamp 82.

The device 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 be a computer 1, the temperature sensor 16 and the torque meter 4 can collect the signals in the running process of the rolling bearing, To monitor the running status of the rolling bearings, the device also includes an oil supply mechanism 6 for providing lubricating oil for each accompanying rolling bearing and the tested rolling bearing. 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 radial 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 of the bearing can be realized by adding multiple screw drive radial 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 effort. 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 (9)

1. A rolling bearing fatigue life test device loaded with a radial alternating load driven by a screw, used to measure the fatigue life of a rolling bearing under the radial alternating load, the rolling bearing is composed of an outer ring, an inner ring and a cage Composed of a plurality of rolling elements distributed between the inner ring and the outer ring, it is characterized in that the device includes a working platform (15), Drive motor (2), is connected on the working platform (15), The rotating shaft (10) is connected with the drive motor (2), and the rotating shaft (10) is provided with a torque meter (4), Fixing fixture A (5) and fixing fixture B (9) are connected on the working platform (15), and each fixing fixture holds a test rolling bearing in it, The movable clamp (8), located between the fixed clamp A (5) and the fixed clamp B (9), is made up of an upper movable sub-fixture (81) and a lower movable sub-fixture (82) opposite to each other, and the movable clamp ( 8) At least one tested rolling bearing is clamped inside, and the tested rolling bearing and the accompanying test rolling bearing are coaxially arranged, and both are 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 radial alternating load loading unit 7 is composed of four loading components acting on the movable fixture, and each loading component is composed of a rotating motor (17), a screw drive mechanism, and a load loading spring (19) that are sequentially connected by transmission. and a connector (20), the connector (20) is connected with the movable fixture (8), the load loading springs (19) of the four loading components are arranged in the shape of a "cross", and each load loading spring (19 ) telescopic directions are all on the radial direction of the rotating shaft (10), and the described screw drive mechanism is made up of worm (71), ball nut (72) and leading screw (73), and described leading screw (73 ) through the ball nut (72), the worm (71) and the ball nut (72) are connected through the threaded engagement on the outer surface of the ball nut (72), the worm (71) and the ball nut ( 72) It is fixed on the working platform (15) through the fixing bracket (76), the axis direction of the screw (73) is consistent with the telescopic direction of the load loading spring (19), and one end of the screw (73) passes through the screw The connecting plate (75) is connected with the loading spring (19), and the worm (71) is connected with the rotating motor (17) in transmission. 2 . The rolling bearing fatigue life testing device with radial alternating loads driven by a screw drive according to claim 1 , wherein the worm and the outer thread of the ball thread form a self-locking worm gear structure. 3 . 3. The rolling bearing fatigue life test device loaded with radial alternating load by screw drive according to claim 1, characterized in that, the connection between the screw connecting plate (75) and the screw (73) is provided with A rotary bearing (74), through which one end of the screw (73) is rotatably connected to the connecting plate (75) of the screw. 4. The rolling bearing fatigue life testing device with radial alternating load driven by a screw drive according to claim 1, characterized in that two rolling bearings to be tested are clamped in the movable fixture (8). 5. The rolling bearing fatigue life test device loaded with radial alternating load by screw drive according to claim 1, characterized in that, the bottom of the upper movable sub-clamp (81) is provided with an upper arc groove, and the The top of the lower movable sub-fixture (82) is provided with a lower arc-shaped groove, and the upper arc-shaped groove and the lower arc-shaped groove cooperate to form a clamping part that matches the rolling bearing. The screw drive radial alternating load loading unit Consists of an upper loading assembly, a lower loading assembly, a left loading assembly and a right loading assembly, the upper loading assembly is arranged above the upper movable sub-grip (81) and acts on the top of the upper movable sub-grip (81), the The lower loading assembly is arranged under the lower movable sub-clamps (82) and acts on the bottom of the lower movable sub-clamps (82), and the left loading assembly is arranged on the left side of the movable clamps (8) and acts on the upper movable sub-clamps (81) and the junction of the following movable sub-clamps (82), the right loading assembly is arranged on the right side of the movable clamps (8) and acts on the upper movable sub-clamps (81) and the lower movable sub-clamps (82) Junction. 6. The rolling bearing fatigue life test device loaded with radial alternating load by screw drive according to claim 5, characterized in that, the temperature sensor (16) is arranged in the upper arc groove or the lower arc groove, And in contact with the outer ring of the rolling bearing. 7. The rolling bearing fatigue life test device loaded with radial alternating load by screw drive according to claim 1, characterized in that, the rotating shaft (10) is connected to the drive motor (2) through a shaft coupling (3) Drive connection. 8. the rolling bearing fatigue life testing device of screw drive load radial alternating load according to claim 1, is characterized in that, this device also comprises and drives motor (2), temperature sensor (16), torque meter ( 4) and the controller connected by communication with the rotating electrical machine (17). 9. The rolling bearing fatigue life testing device loaded with radial alternating load by screw drive according to claim 8, characterized in that the device also includes an oil supply mechanism for providing lubricating oil for the accompanying rolling bearing and the rolling bearing being tested (6), the oil supply mechanism (6) is in communication connection with the controller.