High speed bearing test bench

Abstract

The present invention provides a high-speed bearing test bench, including a driving motor, wherein the output shaft of the driving motor is connected to the input shaft of a speed increasing device through a coupling, the output shaft of the speed increasing device and the main shaft of the bearing to be tested are an integrated structure, the bearing to be tested is fixed in a bearing chamber by a tooling, the speed increasing device is a friction speed increasing device, and the speed change mechanism in the speed increasing device is connected by friction for transmission. Since the present invention adopts a friction transmission method, there is no periodic impact caused by gear transmission during operation, so the vibration generated is smaller and the output speed is smoother. Friction transmission can allow the high-speed bearing test bench to achieve a higher speed and smaller vibration, thereby improving the precision of the high-speed bearing test bench.

Description

Technical Field

[0001] The invention relates to a bearing test bench, in particular to a high-speed bearing test bench. Background Art

[0002] The high-speed bearing test bench is a bearing performance test device. The current high-speed bearing test bench is generally tested by the motor driving the main shaft through the input coupling, gear box and output coupling. Due to the influence of the motor body vibration and the gear box vibration, the high precision and high speed of the test cannot be achieved. Summary of the invention

[0003] The purpose of the present invention is to overcome the above defects and provide a high-speed bearing test bench with small vibration, high precision and high speed.

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] A high-speed bearing test bench includes a driving motor, wherein the output shaft of the driving motor is connected to the input shaft of a speed increasing device through a coupling, the output shaft of the speed increasing device and the main shaft of the bearing to be tested are an integrated structure, and the bearing to be tested is fixed in a bearing chamber by a tooling. The invention is characterized in that the speed increasing device is a friction speed increasing device, and the speed changing mechanism in the speed increasing device adopts a friction method for transmission connection.

[0006] The high-speed bearing test bench, wherein: the speed increasing device is a friction planetary speed increasing mechanism, the planet carrier is fixedly connected to the speed increasing device housing, the friction planetary gear is installed on the planet carrier, the friction planetary gear abuts against the friction inner ring and generates static friction, the friction inner ring is dynamically connected to the speed increasing device input shaft, the friction planetary gear abuts against the friction sun gear and generates static friction, and the friction sun gear is fixedly connected to the speed increasing device output shaft.

[0007] The high-speed bearing test bench, wherein: the friction planetary speed increaser mechanism has a high-low speed switching mechanism. When the drive motor runs at a lower speed, the friction planetary speed increaser mechanism runs at a low speed gear to output sufficient torque for the bearing test bench to drive the bearing to start; when the drive motor runs at a higher speed, the friction planetary speed increaser mechanism runs at a high speed gear, which can test the performance of the tested bearing under high speed conditions.

[0008] The high-speed bearing test bench, wherein: a low-speed planetary gear and a high-speed planetary gear are mounted on the planetary carrier, the friction-type inner ring is divided into a low-speed inner ring and a high-speed inner ring, the low-speed planetary gear can abut against the low-speed inner ring and generate static friction, and the high-speed planetary gear can abut against the high-speed inner ring and generate static friction;

[0009] The friction type planetary speed increasing mechanism is provided with a high-low speed switching mechanism, and the high-low speed switching mechanism includes a locking mechanism and a friction transmission mechanism, wherein:

[0010] The locking mechanism is composed of a locker located on the input shaft of the speed increasing device, a high-speed locking groove located on the high-speed inner ring, and a low-speed locking groove located on the low-speed inner ring; the locker can have a tendency to move inward in the radial direction under the action of a spring; the locker is provided with a locking pin facing the low-speed locking groove and the high-speed locking groove respectively;

[0011] The friction transmission mechanism consists of a circular friction column located on the input shaft of the speed increasing device, a high-speed transmission ring groove located on the high-speed inner ring, and a low-speed transmission ring groove located on the low-speed inner ring; the circular friction column can have a tendency to move inward in the radial direction under the action of another spring.

[0012] The high-speed bearing test bench, wherein: the friction transmission mechanism comes into contact with the low-speed inner ring and the high-speed inner ring before the locking mechanism.

[0013] The high-speed bearing test bench, wherein: the spring stiffness of the locking mechanism and the spring stiffness of the friction transmission mechanism satisfy the following relationship:

[0014]

[0015] Among them, k1 is the stiffness of the spring in the locking mechanism, k2 is the stiffness of the spring in the transmission mechanism, m1 is the mass of the locker, m2 is the mass of the circular friction column, r1 is the radius of the locker near the center, r2 is the radius of the circular friction column near the center, l1 is the reciprocating length of the locker, l2 is the reciprocating length of the circular friction column, ω1 is the angular velocity for setting a low speed, and ω2 is the angular velocity for setting a high speed.

[0016] The high-speed bearing test bench, wherein: the sun gear and the planetary gear are circular friction wheels, and the inner ring is a circular ring whose inner surface provides friction.

[0017] The high-speed bearing test bench, wherein: the material of the friction wheel and the ring is a material with strong rigidity and wear resistance.

[0018] The high-speed bearing test bench, wherein: the friction wheel and the ring are made of alloy steel or ceramic material.

[0019] Since the present invention adopts a friction transmission mode, there is no periodic impact caused by gear transmission during operation, so the vibration generated is smaller and the output speed is smoother. The friction transmission can allow the high-speed bearing test bench to achieve a higher speed and less vibration, thereby improving the precision of the high-speed bearing test bench. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the high-speed bearing test bench provided by the present invention.

[0021] Figure 2 , Figure 3 It is a schematic diagram of the friction type planetary speed increasing mechanism adopted by the present invention.

[0022] Figure 4 It is an exploded structural cross-sectional view of the friction transmission mechanism and the locking mechanism;

[0023] Figure 5 It is a three-dimensional diagram of the exploded structure of the friction transmission mechanism and the locking mechanism.

[0024] Explanation of the accompanying drawings: 1-driving motor, 2-coupling, 3-speed increasing device, 4-bearing chamber, 5-speed increasing device input shaft, 6-locking mechanism, 7-speed increasing device housing, 8-high-speed inner ring, 9-low-speed inner ring, 10-high-speed planetary gear, 11-friction sun gear, 12-speed increasing device output shaft, 13-low-speed planetary gear, 14-planetary carrier, 15-friction transmission mechanism; 16-circular friction column; 17-lock; 18-high-speed transmission groove; 19-high-speed locking groove; 20-low-speed locking groove; 21-low-speed transmission groove. DETAILED DESCRIPTION

[0025] Some specific embodiments of the present invention will be described in detail below in an exemplary and non-restrictive manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to true scale.

[0026] Figure 1 It is a schematic diagram of a high-speed bearing test bench provided by the present invention, including a driving motor 1, the output shaft of the driving motor 1 is connected to the input shaft of the speed increasing device 3 through a coupling 2, the output shaft of the speed increasing device 3 and the main shaft of the tested bearing are integrated, and the tested bearing is fixed in the bearing chamber 4 by a tooling.

[0027] Among them, Figure 2 , Figure 3 As shown, the speed increasing device 3 is a friction speed increasing device, that is, the speed changing mechanisms in the speed increasing device 3 are all connected by friction for transmission.

[0028] Figure 2 , Figure 3It is a schematic diagram of an embodiment of the speed increasing device 3 of the present invention, which is a friction planetary speed increasing mechanism, the planet carrier 14 is fixedly connected to the speed increasing device housing 7, the low speed planetary gear 13 and the high speed planetary gear 10 are installed on the planet carrier 14, the low speed planetary gear 13 and the low speed inner ring 9 abut and generate static friction, the high speed planetary gear 10 and the high speed inner ring 8 abut and generate static friction, the speed increasing device input shaft 5 can rely on the friction transmission mechanism 15 and the locking mechanism 6 to switch the power between the low speed inner ring 9 and the high speed inner ring 8, the low speed planetary gear 13 and the high speed planetary gear 10 abut and generate static friction with the friction type sun gear 11. The friction type sun gear 11 is fixedly connected to the speed increasing device output shaft 12.

[0029] When the drive motor 1 runs below a certain relatively low speed v1, due to the spring force inside the locking mechanism 6 and the friction transmission mechanism 15, the locker and the locking groove on the low-speed inner ring 9 are engaged, and the power output by the drive motor 1 is successively transmitted to the bearing chamber through the speed increaser input shaft 5, the low-speed inner ring 9, the low-speed planetary gear 13, the friction sun gear 11, and the speed increaser output shaft 12. At this time, since the journal and the foil of the air bearing under test are metal sliding friction when running at a low speed, a large torque is required to rotate the main shaft.

[0030] When the drive motor 1 runs at a higher speed v2, the spring force inside the locking mechanism 6 and the friction transmission mechanism 15 is insufficient to support the centrifugal force on the locker and the circular friction column, and the locker and the locking groove on the high-speed inner ring 8 engage, and the power output by the drive motor 1 is transmitted to the bearing chamber in sequence through the speed increaser input shaft 5, the high-speed inner ring 8, the high-speed planetary gear 10, the friction sun gear 11, and the speed increaser output shaft 12. At this time, since there is an air film support between the journal and the foil of the air bearing under test when it runs at high speed, even if the torque provided by the speed increaser output shaft 12 is very small, it can meet the operation of the air bearing, and the test bench can also obtain a higher operating speed.

[0031] Specifically, if Figure 4 , Figure 5 As shown,

[0032] The locking mechanism 6 is composed of a locker 17 located on the speed increasing device input shaft 5, a high-speed locking groove 19 located on the high-speed inner ring 8, and a low-speed locking groove 20 located on the low-speed inner ring 9. The locker 17 is installed in a radial movable chamber opened on the speed increasing device input shaft 5, and has a tendency to move inward in the radial direction under the action of a spring; the locker 17 extends a locking pin toward the low-speed locking groove 20 and the high-speed locking groove 19 respectively.

[0033] The friction transmission mechanism is composed of a circular friction column 16 located on the speed increasing device input shaft 5, a high speed transmission ring groove 18 located on the high speed inner ring 8, and a low speed transmission ring groove 21 located on the low speed inner ring 9. The circular friction column 16 is installed in the radial activity chamber or another radial activity chamber opened on the speed increasing device input shaft 5, and has a tendency to move inward in the radial direction under the action of another spring.

[0034] During the operation of the speed increasing device 3, the locker 17 and the circular friction column 16 on the input shaft 5 of the speed increasing device are always subjected to the centrifugal force generated by the rotation and the elastic force of the spring in the radial activity chamber. When the speed of the driving motor 1 is reduced to a certain speed V1, the spring elastic force on the circular friction column 16 is greater than the centrifugal force generated by the rotation, and the circular friction column 16 first contacts the low-speed transmission ring groove 21 on the low-speed inner ring 9, and transmits power through friction, so that the low-speed inner ring 9 and the input shaft 5 of the speed increasing device gradually rotate in the same direction, thereby reducing the impact of the locker 17 and the low-speed locking groove 20 on the low-speed inner ring 9 during the engagement process. As the speed of the driving motor 1 is further reduced, the spring elastic force on the locker 17 is also greater than the centrifugal force generated by the rotation, and a locking pin of the locker 17 engages with the low-speed locking groove 20 on the low-speed inner ring 9, completing the low-speed locking process.

[0035] When the speed of the drive motor 1 increases to a certain speed V2, the spring force on the circular friction column 16 is smaller than the centrifugal force generated by the rotation, and the circular friction column 16 first contacts the high-speed transmission ring groove 18 on the high-speed inner ring 8, and transmits power through friction, so that the high-speed inner ring 8 and the speed-increasing device input shaft 5 gradually rotate in the same direction, reducing the impact of the subsequent engagement process between the lock 17 and the high-speed locking groove 19 on the high-speed inner ring 8. As the speed of the drive motor 1 further increases, the spring force on the lock 17 is also smaller than the centrifugal force generated by the rotation, and the lock 17 engages with the high-speed locking groove 19 on the high-speed inner ring 8, completing the high-speed locking process.

[0036] In order to make the friction transmission mechanism 15 contact the low-speed inner ring 9 and the high-speed inner ring 8 before the locking mechanism 6, the spring stiffness k1 of the locking mechanism 6 and the spring stiffness k2 of the friction transmission mechanism 15 should satisfy the following relationship when selected:

[0037]

[0038] Wherein, k1 is the stiffness of the spring in the locking mechanism, k2 is the stiffness of the spring in the transmission mechanism, m1 is the mass of the locker, m2 is the mass of the circular friction column, r1 is the radius of the locker near the center, r2 is the radius of the circular friction column near the center, l1 is the reciprocating length of the locker, l2 is the reciprocating length of the circular friction column, ω1 is the angular velocity for setting a low speed, and ω2 is the angular velocity for setting a high speed.

[0039] Since the present invention adopts a friction transmission mode, there is no periodic impact caused by gear transmission during operation, so the vibration generated is smaller and the output speed is smoother. The friction transmission can allow the high-speed bearing test bench to achieve a higher speed and less vibration, thereby improving the precision of the high-speed bearing test bench.

[0040] The above description is only illustrative rather than restrictive of the present invention. Those skilled in the art will understand that many modifications, changes or equivalents may be made without departing from the spirit and scope defined by the claims, but all will fall within the scope of protection of the present invention.

Claims

1. A high-speed bearing test bench, comprising a driving motor, wherein the output shaft of the driving motor is connected to the input shaft of a speed increasing device through a coupling, the output shaft of the speed increasing device and the main shaft of the tested bearing are an integrated structure, and the tested bearing is fixed in a bearing chamber by a tooling, characterized in that: The speed increasing device is a friction speed increasing device, and the speed changing mechanism in the speed increasing device is connected by friction. The speed increasing device is a friction type planetary speed increasing mechanism, the planet carrier is fixedly connected to the speed increasing device housing, the friction type planetary gear is installed on the planet carrier, the friction type planetary gear abuts against the friction type inner ring and generates static friction force, the friction type inner ring is dynamically connected to the speed increasing device input shaft, the friction type planetary gear abuts against the friction type sun gear and generates static friction force, and the friction type sun gear is fixedly connected to the speed increasing device output shaft; A low-speed planetary gear and a high-speed planetary gear are installed on the planet carrier, and the friction-type inner ring is divided into a low-speed inner ring and a high-speed inner ring. The low-speed planetary gear can abut against the low-speed inner ring and generate static friction, and the high-speed planetary gear can abut against the high-speed inner ring and generate static friction; The friction type planetary speed increasing mechanism is provided with a high-low speed switching mechanism, and the high-low speed switching mechanism includes a locking mechanism and a friction transmission mechanism, wherein: The locking mechanism is composed of a locker located on the input shaft of the speed increasing device, a high-speed locking groove located on the high-speed inner ring, and a low-speed locking groove located on the low-speed inner ring; the locker can have a tendency to move inward in the radial direction under the action of a spring; the locker is provided with a locking pin facing the low-speed locking groove and the high-speed locking groove respectively; The friction transmission mechanism is composed of a circular friction column located on the input shaft of the speed increasing device, a high-speed transmission ring groove located on the high-speed inner ring, and a low-speed transmission ring groove located on the low-speed inner ring; the circular friction column can have a tendency to move inward in the radial direction under the action of another spring; The sun gear and the planetary gear are circular friction wheels, the inner ring is a circular ring whose inner surface provides friction, and the friction wheel and the circular ring are made of materials with strong rigidity and wear resistance.

2. The high-speed bearing test bench according to claim 1, characterized in that: The friction type planetary speed increaser mechanism has a high-low speed switching mechanism. When the drive motor runs at a lower speed, the friction type planetary speed increaser mechanism runs at a low speed gear to output sufficient torque for the bearing test bench to drive the bearing to start; when the drive motor runs at a higher speed, the friction type planetary speed increaser mechanism runs at a high speed gear to test the performance of the tested bearing under high speed conditions.

3. The high-speed bearing test bench according to claim 1, characterized in that: The friction transmission mechanism comes into contact with the low-speed inner ring and the high-speed inner ring before the locking mechanism.

4. The high-speed bearing test bench according to claim 3, characterized in that: The spring stiffness of the locking mechanism and the spring stiffness of the friction transmission mechanism satisfy the following relationship: Among them, k1 is the stiffness of the spring in the locking mechanism, k2 is the stiffness of the spring in the transmission mechanism, m1 is the mass of the locker, m2 is the mass of the circular friction column, r1 is the radius of the locker near the center, r2 is the radius of the circular friction column near the center, l1 is the reciprocating length of the locker, l2 is the reciprocating length of the circular friction column, ω1 is the angular velocity for setting a low speed, and ω2 is the angular velocity for setting a high speed.

5. The high-speed bearing test bench according to claim 1, characterized in that: The friction wheel and the ring are made of alloy steel or ceramic material.

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