High-low temperature environment endurance test bench and test method for constant velocity joint sealing cover

Abstract

The application provides a high-low temperature environment endurance test bench and test method for a constant velocity joint sealing cover, three pairs of clamping sleeves are used to clamp three input shafts and output shafts of the constant velocity joints respectively on the left side and the right side, the temperature of a high-low temperature box is adjusted according to requirements during the test, a large swing mechanism and a small swing mechanism drive the input shaft and the output shaft to swing respectively at a required angle and frequency, a rotating mechanism drives the constant velocity joint to rotate at a required rotating speed, the offset of the rotating center of the telescopic ball cage type constant velocity joint on the input shaft side is adjusted, the input shaft can be relatively moved with the cylindrical shell, for different specifications of the constant velocity joints, only the matched clamping sleeves need to be replaced, the loading mechanism is connected to the right end of the right rotating shaft of the rotating mechanism, the comprehensive performance test of the constant velocity joint can be conducted, the test bench can simulate the working condition of the real vehicle, the high-low temperature environment endurance test of multiple constant velocity joint sealing covers can be conducted, the high-low temperature box has less openings, the high and low temperatures can be adjusted more effectively, the operation is convenient, and the adaptability is strong.

Description

Technical Field

[0001] This invention relates to a high and low temperature environment durability test bench and test method for constant velocity joint seal covers. The test bench can simulate the actual vehicle motion conditions and simultaneously conduct durability tests on multiple constant velocity joint seal covers under high and low temperature environmental conditions. Background Technology

[0002] A constant velocity joint (CV joint) is a universal joint in which the instantaneous angular velocities of the output and input shafts are equal at all operating angles, enabling the transmission of torque and rotational motion. It overcomes the non-uniform velocity problem inherent in ordinary cross-shaft universal joints, making it particularly suitable for use in automotive steering drive axles. The CV joint's sealing cover is a pleated sealing component fixed to the outer sleeve and intermediate shaft of the CV joint, forming a space to store grease and prevent grease leakage or foreign object intrusion. During operation, if the sealing cover breaks or grease leaks, dust and mud will enter, causing rapid wear on the precision components inside the CV joint and leading to malfunctions in the power steering system.

[0003] Currently, when conducting high and low temperature environmental durability tests on constant velocity joint (CV joint) dust covers, companies typically cut off the intermediate shaft of the CVT and conduct separate high and low temperature environmental durability tests on the two sealing covers on the input and output shaft sides. Furthermore, each sealing cover test requires a drive mechanism and a swing mechanism, necessitating at least three holes in the high and low temperature chamber to accommodate the drive shafts of these mechanisms. If multiple sealing covers are tested in a single high and low temperature chamber, even more holes need to be drilled to accommodate more drive shafts. The drawback of this method is the difficulty in simultaneously conducting high and low temperature environmental durability tests on multiple complete CVT sealing covers for synchronous comparison. It also suffers from structural complexity, low efficiency, and is unsuitable for the needs of modern large-scale production and testing. Summary of the Invention

[0004] This invention provides a high and low temperature environment durability test bench and test method for constant velocity joint (CV joint) sealing covers. Three pairs of clamping sleeves clamp the input and output shafts of three CVTs on the left and right sides respectively. During the test, the temperature of the high and low temperature chamber is adjusted as required. Large and small pendulum mechanisms drive the input and output shafts to swing at required angles and frequencies, respectively. A rotating mechanism drives the CVTs to rotate at the required speed. By adjusting the offset of the rotation center of the universal joint on the input shaft side of the telescopic ball cage type CVT, the input shaft can be moved relative to the cylindrical shell. For CVTs of different specifications, only the matching clamping sleeves need to be replaced. A loading mechanism is connected to the right end of the right-hand shaft of the rotating mechanism to perform comprehensive performance tests on the CVTs. The test bench can simulate real vehicle operating conditions and conduct high and low temperature environment durability tests on multiple CVT sealing covers. The high and low temperature chamber has few openings, allowing for more effective adjustment of high and low temperatures. It is easy to operate and highly adaptable.

[0005] The constant velocity universal joint sealing cover high and low temperature environment durability test bench of the present invention mainly consists of a frame, a high and low temperature chamber, a large swing mechanism, a small swing mechanism, a rotating mechanism, and a constant velocity universal joint. The frame is a frame structure. The high and low temperature chamber is installed in the middle of the frame. The high and low temperature chamber has three holes on the top, bottom, and left side, which minimizes contact with the external environment and allows for more effective adjustment and control of high and low temperatures. The large swing mechanism is mounted on the frame, and its actuator extends into the high and low temperature chamber through the top and bottom holes. The small swing mechanism is installed in the middle of the large swing mechanism, and its actuator is placed in the high and low temperature chamber. The rotating mechanism is mounted on the frame, and its actuator extends into the high and low temperature chamber through the left hole. The constant velocity universal joint is installed in the rotating mechanism.

[0006] The large swing mechanism mainly consists of a support frame, servo motor, reducer, base, synchronous pulley, synchronous belt, adapter ring, lower swing seat, deep groove ball bearing, swing seat cover, hollow shaft, lower swing rod, upper swing seat, upper swing rod, and large swing shaft. The support frame is U-shaped, with the support frame column fixed to the front side of the rear panel of the platform, located at the rear of the high and low temperature chamber. The base is fixed to the rear of the lower end face of the support frame. The front end face of the servo motor is fixed to the rear end face of the reducer, and the servo motor shaft is installed in the input hole of the reducer. The front end face of the reducer is installed at the lower end of the base, and the reducer shaft passes through the hole at the lower end of the base. The synchronous pulley is fitted onto the reducer shaft, and the mating surfaces are limited by a flat key. The lower swing seat is fixed in the hole on the bottom surface of the support frame, and the upper end of the lower swing seat extends into... The hole at the bottom of the high and low temperature chamber is sealed with thermal insulation material. A pair of deep groove ball bearings are installed in the lower swing seat, and swing seat covers are installed at both ends. The hollow shaft is fitted into the inner hole of the deep groove ball bearing. The lower end of the hollow shaft is fixed to the upper end of the adapter ring. The synchronous pulley is fitted onto the outer circle of the adapter ring, and the mating surface is limited by a flat key. The synchronous belt is fitted onto the two synchronous pulleys to form a mating relationship. The lower swing rod is fixed to the upper end of the hollow shaft through the hole. The upper swing seat is fixed into the hole on the upper end face of the support frame. The lower end of the upper swing seat extends into the hole on the top of the high and low temperature chamber, and the hole is sealed with thermal insulation material. The upper swing seat is fitted with a deep groove ball bearing, and the upper end is fitted with a swing seat cover. The large swing shaft is fitted into the inner hole of the deep groove ball bearing. The upper swing rod is fixed to the lower side of the large swing shaft through the hole. The upper and lower swing rods are parallel and symmetrical.

[0007] The small swing mechanism mainly consists of a servo motor, reducer, connecting seat, synchronous pulley, coupling, long straight shaft, hollow shaft, tapered roller bearing, adapter ring, bearing cover, lower swing frame, lower swing rod, swing frame cover, bevel gear, external hexagonal shaft, internal hexagonal shaft, lower slide seat, slide cover, small swing seat, swing seat cover, lower swing shaft, lower base plate, upper slide seat, upper swing rod, deep groove ball bearing, upper swing shaft, upper base plate, and swing frame. The front end of the servo motor is fixed to the rear end of the reducer, and the servo motor shaft is installed in the input hole of the reducer. The two ends of the connecting seat are fixed to the end faces of the reducer and the synchronous pulley, respectively. The synchronous pulley is fitted onto the outer circle of the adapter ring, and the lower end of the hollow shaft is fixed to the upper end of the adapter ring. The lower end of the shaft passes through the inner hole of the connecting ring. The two holes on both sides of the coupling are respectively fitted onto the lower ends of the reducer output shaft and the long straight shaft. The mating surfaces are limited by flat keys. A pair of tapered roller bearings are installed in the hollow shaft hole. The long straight shaft is fitted into the inner hole of the tapered roller bearing. A bearing cover is installed on the upper end of the hollow shaft. The lower swing frame is fixed to the upper end face of the hole of the lower swing rod. Swing frame covers are installed on both sides of the lower swing frame. A pair of tapered roller shafts are installed in the holes of the swing frame covers. The left round shaft of the external hexagonal rotating shaft is fitted into the inner hole of the tapered roller bearing. The bevel gear is installed on the upper end of the long straight shaft. The bevel gear is installed on the stepped end face of the left round shaft of the external hexagonal rotating shaft. The mating surfaces are limited by flat keys. The two bevel gears are meshed. The lower slide seat is installed on the upper surface of the lower swing rod by a flat key guide. The lower slide seat can be moved left and right to adjust its position. The lower slide seat is fixed by bolts in the U-shaped grooves on both sides of the lower swing arm. Slide seat covers are installed on both sides of the lower slide seat, and a pair of tapered roller bearings are installed in the holes of the slide seat covers. The hexagonal inner hole of the internal hexagonal shaft is fitted onto the right hexagonal shaft of the external hexagonal shaft. The internal hexagonal shaft can be moved left and right to adjust its position. The outer diameters of the internal hexagonal shaft are fitted into the inner holes of the tapered roller bearings. A small swing seat is installed on the upper end face of the lower slide seat, containing a pair of tapered roller bearings. A swing seat cover is installed at the upper end, and the lower swing shaft is fitted into the inner hole of the tapered roller bearings. A bevel gear is installed on the left stepped end face of the outer diameter of the internal hexagonal shaft and at the lower end of the lower swing shaft. All mating surfaces are limited by flat keys. The two bevel gears... The wheels are meshed. The lower base plate is mounted on the upper end of the lower swing shaft through the center hole, and the mating surface is limited by a flat key. The upper slide is mounted on the lower surface of the upper swing rod through a flat key. The upper slide can be moved left and right to adjust its position. The upper slide is fixed by bolts in the U-shaped grooves on both sides of the upper swing rod. The upper slide contains a deep groove ball bearing, and the lower end is fitted with a slide cover. The upper swing shaft is fitted into the inner hole of the deep groove ball bearing. The upper base plate is mounted on the lower end of the upper swing shaft through the center hole, and the mating surface is limited by a flat key. The swing frame is U-shaped. The rectangular grooves on the upper and lower sides of the swing frame are respectively fitted into the square bosses on the upper and lower base plates. The swing frame can be moved left and right to adjust its position. It is fixed to the upper and lower base plates by bolts in the U-shaped grooves on both sides of the upper and lower ends of the swing frame.

[0008] The rotating mechanism mainly consists of a frequency converter motor, coupling, rotating shaft seat, tapered roller bearings, rotating shaft cover, intermediate rotating shaft, square frame, upper left rotating seat, middle left rotating seat, lower left rotating seat, rotating seat cover, deep groove ball bearing, upper left rotating shaft, lower left rotating shaft, synchronous pulley, synchronous belt, right rotating seat, right rotating shaft, and clamping sleeve. The frequency converter motor is fixed on the platform on the upper left of the frame, and the rotating shaft seat is fixed on the vertical surface with the opening in the middle of the frame. The right end of the rotating shaft seat extends into the hole on the left side of the high and low temperature chamber, and the gap is sealed with heat insulation material. A pair of tapered roller bearings are installed in the rotating shaft seat, and rotating shaft covers are installed on both sides. The intermediate rotating shaft is fitted into the inner hole of the tapered roller bearing from the left side. The two holes on both sides of the coupling are respectively fitted into the output shaft of the frequency converter motor and the left end of the intermediate rotating shaft, with the mating surfaces limited by a flat key. The hole on the left side of the square frame fits onto the shaft cover and is fixed to the right side of the shaft seat. The right side of the intermediate rotating shaft is fitted into the inner hole of the tapered roller bearing, which is installed into the left middle rotating seat. The left end of the left middle rotating seat is installed in the middle of the right side of the square frame, and the intermediate rotating shaft passes through the holes in the middle of the left and right sides of the square frame. The two sides of the upper left rotating shaft are fitted into the inner holes of a pair of deep groove ball bearings, which are installed into the upper left rotating seat. Rotating seat covers are installed on both sides, and the left end of the upper left rotating seat is fitted with... On the upper right side of the frame, the left end of the upper left rotating shaft extends into the hole on the upper right side of the frame; the lower left rotating shaft is fitted with a pair of deep groove ball bearings on both sides, the deep groove ball bearings are fitted into the lower left rotating seat, and rotating seat covers are fitted on both sides. The left end of the lower left rotating seat is fitted on the lower right side of the frame, and the left end of the lower left rotating shaft extends into the hole on the lower right side of the frame; two synchronous pulleys are fitted in the middle of the middle rotating shaft, and synchronous pulleys are fitted on the left ends of the upper left rotating shaft and the lower left rotating shaft. The mating surfaces are limited by flat keys, and two synchronous belts are respectively fitted onto the two pairs of synchronous pulleys to form a mating relationship; on the far right are three identical sets. The driven rotating device has three right-hand rotating shafts installed in the inner holes of three pairs of deep groove ball bearings on both sides. The three pairs of deep groove ball bearings are installed in three right-hand rotating seats, and three pairs of rotating seat covers are installed on both sides. The left ends of the three right-hand rotating seats are installed on the right side of the swing frame. The left ends of the three right-hand rotating shafts extend into the upper, middle, and lower holes on the right side of the swing frame. The six clamping sleeves on the left and right sides are of the same specification. The left end holes of the three clamping sleeves on the left side are respectively fitted onto the right ends of the upper left rotating shaft, the middle rotating shaft, and the lower left rotating shaft, and are locked with bolts. The right end holes of the three clamping sleeves on the right side are respectively fitted onto the left ends of the three right-hand rotating shafts and are locked with bolts.

[0009] The method and procedures for the high and low temperature environment durability test of the constant velocity universal joint sealing cover are as follows:

[0010] ① Adjust the upper and lower swing arms of the large swing mechanism to rotate parallel to the axis of the variable frequency motor, and adjust the swing frame of the small swing mechanism to rotate parallel to the axis of the variable frequency motor, so that the large and small swing mechanisms return to their initial positions.

[0011] ② Based on the specifications and dimensions of the constant velocity universal joint used in the test, adjust the sliding block by moving it left and right on the lower swing arm, and adjust the upper sliding block by moving it left and right on the upper swing arm. Also adjust the internal hexagonal shaft by moving it left and right outside the external hexagonal shaft. Adjust the swing bracket by moving it left and right between the upper and lower base plates. Align the rotation center of the universal joint on the input shaft side with the center of the large swing shaft and the hollow shaft, and align the rotation center of the universal joint on the output shaft side with the center of the upper and lower swing shafts. The lower slide block is fixed by bolts in the U-shaped grooves on both sides of the lower swing arm, the upper slide block is fixed by bolts in the U-shaped grooves on both sides of the upper swing arm, and the upper and lower ends of the swing frame are fixed to the base plate by bolts in the U-shaped grooves on both sides of the swing frame; the three constant velocity universal joint input shafts are respectively installed in the right side holes of the three clamping sleeves on the left side and locked with bolts; the three constant velocity universal joint output shafts are respectively installed in the left side holes of the three clamping sleeves on the right side and locked with bolts; and the three constant velocity universal joints are installed in the middle of the rotating mechanism.

[0012] ③ Start the servo motor of the small pendulum mechanism, which drives the pendulum frame to swing through the reducer, coupling, long straight shaft, bevel gear, external hexagonal shaft, internal hexagonal shaft, bevel gear, lower pendulum shaft, lower base plate, upper base plate, and upper pendulum shaft. Control the swing angle and frequency of the pendulum frame according to the test requirements, that is, the swing angle and frequency of the constant velocity universal joint output shaft relative to the intermediate shaft. Start the servo motor of the large pendulum mechanism, which drives the lower pendulum rod and upper pendulum rod to swing through the reducer, synchronous pulley, synchronous belt, connecting ring, hollow shaft, and large pendulum shaft, so that the small pendulum mechanism also swings as a whole. Control the swing angle and frequency of the lower pendulum rod and upper pendulum rod according to the test requirements, that is, the swing angle and frequency of the constant velocity universal joint input shaft relative to the intermediate shaft. Start the frequency converter motor of the rotating mechanism, which drives the constant velocity universal joint to rotate at the speed required by the test through the coupling, intermediate rotating shaft, synchronous pulley, synchronous belt, upper left rotating shaft, lower left rotating shaft, clamping sleeve, and right rotating shaft.

[0013] ④ The large swing mechanism, small swing mechanism, and rotating mechanism operate continuously at the same time, driving the constant velocity universal joint to swing and rotate. During the test, adjust the temperature of the high and low temperature chamber as required, and conduct a high and low temperature environment durability test on the constant velocity universal joint sealing cover. Observe through the glass door of the high and low temperature chamber. When the constant velocity universal joint sealing cover shows signs of breakage, grease leakage, or other damage, the machine should be stopped and the constant velocity universal joint should be removed for inspection.

[0014] ⑤ When testing the telescopic ball cage constant velocity universal joint, since its input shaft can move axially to the left and right relative to the cylindrical shell, the total length of the constant velocity universal joint is variable. To verify this function, when installing the telescopic ball cage constant velocity universal joint, the center of rotation of the universal joint on the input shaft side and the center of the large swing shaft and the hollow shaft can be offset to the left and right to a certain extent. In this way, while the large swing mechanism is swinging, there will be relative left and right movement between the cylindrical shell and the input shaft.

[0015] ⑥ For constant velocity universal joints of different specifications and sizes, simply replace the clamping sleeve with one that matches the size to conduct the test;

[0016] ⑦ Based on this test bench, by connecting loading mechanisms to the right ends of the three right-hand shafts of the rotating mechanism, such as a servo motor working in torque mode to perform reverse loading, a reverse load is applied to the output shaft of the constant velocity universal joint, and various comprehensive performance tests of the constant velocity universal joint can be carried out.

[0017] This invention overcomes the shortcomings of existing test benches, can simulate real vehicle working conditions, and conduct high and low temperature environmental durability tests on multiple constant velocity joint sealing covers. It features a high and low temperature chamber with few openings and minimal contact with the external environment, which allows for more effective adjustment and control of high and low temperatures. It is also easy to operate and highly adaptable, providing strong support for enterprises to test and improve the performance of constant velocity joints, and has great application value. Attached Figure Description

[0018] Figure 1 This is a three-dimensional rendering of the high and low temperature environment durability test bench for the constant velocity universal joint sealing cover of the present invention.

[0019] Figure 2 This is a three-dimensional rendering of the main mechanical mechanism of the test bench of the present invention in its initial position;

[0020] Figure 3 This is a three-dimensional rendering of the pendulum frame of the small pendulum mechanism of the main mechanical structure of the test bench of the present invention after swinging.

[0021] Figure 4 This is a three-dimensional rendering of the large pendulum rod, small pendulum rod, and pendulum frame of the large pendulum mechanism of the main mechanical mechanism of the test bench of the present invention after swinging.

[0022] Figure 5 This is a three-dimensional cross-sectional view of the rotating mechanism, the upper part of the large pendulum mechanism, and the upper right part of the small pendulum mechanism of the test bench of the present invention in the vertical direction.

[0023] Figure 6 This is a three-dimensional cross-sectional view of the lower part of the large pendulum mechanism and the lower part of the small pendulum mechanism of the test bench of the present invention in the vertical direction;

[0024] Figure 7 This is a partial three-dimensional rendering of the cooperation between the internal hexagonal shaft and the external hexagonal shaft of the test bench of the present invention.

[0025] 1-High and low temperature chamber, 2-Frame, 3, 4-Servo motors, 5, 6-Reducer, 7-Connecting seat, 8-Lower swing seat, 9-Lower swing rod, 10-Slide seat, 11-External hexagonal shaft, 12-Lower swing frame, 13-Small swing seat, 14, 15, 16-Right-hand rotating seat, 17-Swing frame, 18-Upper base plate, 19-Upper swing rod, 20-Support frame, 21-Upper swing seat, 22, 75, 83, 87-Swing seat cover, 23-Variable frequency motor, 24-Upper left rotating seat, 25, 93-Coupling, 26-Rotating shaft seat, 27-Middle left rotating seat, 28, 90-Synchronous belt, 29-Square frame, 30-Lower left rotating seat, 31-Clamping sleeve, 32-Constant velocity universal joint, 33, 35, 43, 47, 58, 59-Rotating seat cover, 34-Right-hand rotating shaft, 36, 4 0, 42, 44, 57, 84 - Deep groove ball bearings; 37 - Upper swing shaft; 38, 67, 69 - Slide cover; 39 - Upper slide; 41 - Large swing shaft; 45, 53, 54, 55, 89, 92 - Synchronous pulleys; 46 - Upper left swing shaft; 48, 49 - Swing shaft cover; 50, 52, 70, 73, 77, 82 - Tapered roller bearings; 51 - Intermediate swing shaft. 56-Left-downward rotating shaft, 60-Input shaft, 61-Cylindrical shell, 62, 64-Sealing cover, 63-Intermediate shaft, 65-Output shaft, 66-Lower base plate, 68-Internal hexagonal rotating shaft, 71, 72, 78, 79-Bevel gear, 74-Lower swing shaft, 76, 80-Swing frame cover, 81-Bearing cover, 85-Hollow shaft, 86-Long straight shaft, 88-Adapter ring, 91-Base. Detailed Implementation

[0026] The constant velocity universal joint sealing cover high and low temperature environment durability test bench of the present invention mainly consists of a frame 2, a high and low temperature chamber 1, a large swing mechanism, a small swing mechanism, a rotating mechanism, and a constant velocity universal joint 32. The frame 2 is a frame structure. The high and low temperature chamber 1 is installed in the middle of the frame 2. The high and low temperature chamber 1 has three holes on the top, bottom, and left side, which minimizes contact with the external environment and allows for more effective adjustment and control of high and low temperatures. The large swing mechanism is mounted on the frame 2, and its actuator extends into the high and low temperature chamber 1 through the top and bottom holes. The small swing mechanism is installed in the middle of the large swing mechanism, and its actuator is placed in the high and low temperature chamber 1. The rotating mechanism is mounted on the frame 2, and its actuator extends into the high and low temperature chamber 1 through the left hole. The constant velocity universal joint 32 is installed in the rotating mechanism.

[0027] The large swing mechanism mainly consists of a support frame 20, a servo motor 4, a reducer 6, a base 91, synchronous pulleys (89, 92), a synchronous belt 90, an adapter ring 88, a lower swing seat 8, deep groove ball bearings (42, 84), a swing seat cover (22, 83, 87), a hollow shaft 85, a lower swing rod 9, an upper swing seat 21, an upper swing rod 19, and a large swing shaft 41. The support frame 20 is U-shaped, and its column surface is fixed to the front side of the rear panel of the platform 2, located at a high position. At the rear of the cryogenic chamber 1, the base 91 is fixed to the rear of the lower end face of the support frame 20. The front end face of the servo motor 4 is fixed to the rear end face of the reducer 6. The shaft of the servo motor 4 is installed in the input hole of the reducer 6. The front end face of the reducer 6 is installed at the lower end of the base 91. The shaft of the reducer 6 passes through the hole at the lower end of the base 91. The synchronous pulley 92 is fitted onto the shaft of the reducer 6, and the mating surfaces are limited by a flat key. The lower swing seat 8 is fixed in the hole on the bottom surface of the support frame 20. The upper end of seat 8 extends into the hole below the high and low temperature chamber 1, and the hole is sealed with heat insulation material. A pair of deep groove ball bearings 84 are installed inside the lower seat 8, with seat covers (83, 87) at both ends. A hollow shaft 85 is fitted into the inner hole of the deep groove ball bearings 84, and the lower end of the hollow shaft 85 is fixed to the upper end of the adapter ring 88. A synchronous pulley 89 is fitted onto the outer circumference of the adapter ring 88, and the mating surface is limited by a flat key. A synchronous belt 90 is fitted onto the two synchronous pulleys (89, 92), forming a mating relationship. The swing arm 9 is fixed to the upper end of the hollow shaft 85 through the hole fitting. The upper swing seat 21 is fixed in the hole on the upper end face of the support frame 20. The lower end of the upper swing seat 21 extends into the hole on the top of the high and low temperature chamber 1. The hole is sealed with heat insulation material. A deep groove ball bearing 42 is installed in the upper swing seat 21. The upper end is fitted with a swing seat cover 22. The large swing shaft 41 is fitted into the inner hole of the deep groove ball bearing 42. The upper swing arm 19 is fixed to the lower side of the large swing shaft 41 through the hole fitting. The upper swing arm 19 and the lower swing arm 9 are parallel and symmetrical.

[0028] The small swing mechanism mainly consists of a servo motor 3, a reducer 5, a connecting seat 7, a synchronous pulley 89, a coupling 93, a long straight shaft 86, a hollow shaft 85, tapered roller bearings (70, 73, 77, 82), a transition ring 88, a bearing cover 81, a lower swing frame 12, a lower swing rod 9, a swing frame cover (76, 80), bevel gears (71, 72, 78, 79), an external hexagonal shaft 11, an internal hexagonal shaft 68, a lower sliding seat 10, a sliding seat cover (38, 67, 69), a small swing seat 13, a swing seat cover 75, a lower swing shaft 74, a lower base plate 66, an upper sliding seat 39, an upper swing rod 19, a deep groove ball bearing 40, an upper swing shaft 37, an upper base plate 18, and a swing frame 17; the front end of the servo motor 3 is fixed to... At the rear end face of the reducer 5, the shaft of the servo motor 3 is installed in the input hole of the reducer 5. The two ends of the connecting seat 7 are respectively fixed to the end faces of the reducer 5 and the synchronous pulley 89. The synchronous pulley 89 is fitted onto the outer circle of the adapter ring 88. The lower end of the hollow shaft 85 is fixed to the upper end of the adapter ring 88. The lower end of the long straight shaft 86 passes through the inner hole of the connecting ring 88. The two side holes of the coupling 93 are respectively fitted onto the output shaft of the reducer 5 and the lower end of the long straight shaft 86. The mating surfaces are limited by a flat key. A pair of tapered roller bearings 82 are installed in the hole of the hollow shaft 85. The long straight shaft 86 is fitted into the inner hole of the tapered roller bearings 82. A bearing cover 81 is installed on the upper end of the hollow shaft 85. The lower swing frame 12 is fixed to the upper end face of the hole of the lower swing rod 9. Swing frame covers are installed on both sides of the lower swing frame 12. 76, 80), a pair of tapered roller bearings 77 are installed in the holes of the swing frame cover (76, 80), and the left round shaft of the external hexagonal shaft 11 is fitted into the inner hole of the tapered roller bearing 77; bevel gear 79 is installed on the upper end of the long straight shaft 86, and bevel gear 78 is installed on the stepped end face of the left round shaft of the external hexagonal shaft 11. The mating surfaces are limited by flat keys, and the two bevel gears (79, 78) are meshed; the sliding seat 10 is installed on the upper surface of the lower swing rod 9 by a flat key guide, and the position of the sliding seat 10 can be adjusted by moving the sliding seat 10 left and right. The sliding seat 10 is fixed by bolts in the U-shaped grooves on both sides of the lower swing rod 9. The sliding seat 10 is equipped with sliding seat covers (67, 69) on both sides, and a pair of tapered roller bearings 70 are installed in the holes of the sliding seat covers (67, 69). The hexagonal inner hole of the hexagonal shaft 68 is fitted onto the right hexagonal shaft of the outer hexagonal shaft 11. The position of the inner hexagonal shaft 68 can be adjusted by moving it left and right. The outer circles on both sides of the inner hexagonal shaft 68 are fitted into the inner holes of the tapered roller bearings 70. The small swing seat 13 is mounted on the upper end face of the lower sliding seat 10. A pair of tapered roller bearings 73 are installed in the small swing seat 13. The upper end is fitted with a swing seat cover 75. The lower swing shaft 74 is fitted into the inner hole of the tapered roller bearings 73. The bevel gear 71 is mounted on the left stepped end face of the outer circle of the inner hexagonal shaft 68. The bevel gear 72 is mounted on the lower end of the lower swing shaft 74. The mating surfaces are limited by flat keys. The two bevel gears (71, 72) are meshed. The lower base plate 66 is mounted on the upper end of the lower swing shaft 74 through the center hole. The mating surfaces are limited by flat keys.The upper slide block 39 is mounted on the lower surface of the upper swing arm 19 via a flat key. The upper slide block 39 can be moved left and right to adjust its position. It is fixed to the upper slide block 39 by bolts in the U-shaped grooves on both sides of the upper swing arm 19. A deep groove ball bearing 40 is installed inside the upper slide block 39, and a slide block cover 38 is installed at its lower end. The upper swing shaft 37 is fitted into the inner hole of the deep groove ball bearing 40. The upper base plate 18 is mounted on the lower end of the upper swing shaft 37 through a central hole, and the mating surfaces are limited by a flat key. The swing frame 17 is U-shaped. The rectangular grooves on the upper and lower sides of the swing frame 17 fit onto the square bosses of the upper base plate 18 and lower base plate 66, respectively. The swing frame 17 can be moved left and right to adjust its position. It is fixed to the upper base plate 18 and lower base plate 66 by bolts in the U-shaped grooves on both sides of the upper and lower ends of the swing frame 17.

[0029] The rotating mechanism mainly consists of a variable frequency motor 23, a coupling 25, a rotating shaft seat 26, tapered roller bearings (50, 52), rotating shaft covers (48, 49), a middle rotating shaft 51, a square frame 29, an upper left rotating seat 24, a middle left rotating seat 27, a lower left rotating seat 30, rotating seat covers (33, 35, 43, 47, 58, 59), deep groove ball bearings (36, 44, 57), an upper left rotating shaft 46, a lower left rotating shaft 56, synchronous pulleys (45, 53, 54, 55), a synchronous belt 28, a right rotating seat (14, 15, 16), a right rotating shaft 34, and a clamping sleeve 31. The variable frequency motor 28 is fixed on the platform on the upper left of the frame 2, and the rotating shaft seat 26 is fixed in the middle opening of the frame 2. On the vertical surface, the right end of the rotating shaft seat 26 extends into the hole on the left side of the high and low temperature chamber 1. The hole is sealed with heat insulation material. A pair of tapered roller bearings 50 are installed in the rotating shaft seat 26. Rotating shaft covers (48, 49) are installed on both sides. The middle rotating shaft 51 is fitted into the inner hole of the tapered roller bearing 50 from the left side. The two holes of the coupling 25 are respectively fitted into the output shaft of the frequency converter motor 23 and the left end of the middle rotating shaft 51. The mating surfaces are limited by flat keys. The hole on the left side of the square frame 29 is fitted onto the rotating shaft cover 48 and fixed to the right side of the rotating shaft seat 26. The right side of the middle rotating shaft 51 is installed into the inner hole of the tapered roller bearing 52. The tapered roller bearing 52 is installed into the left middle rotating seat 27. The left end of the left middle rotating seat 27 is installed in the middle of the right side of the square frame 29. The middle rotating shaft 51 passes through the square frame. 29. Holes in the middle of the left and right sides; the upper left rotating shaft 46 is fitted into the inner holes of a pair of deep groove ball bearings 44 on both sides, the deep groove ball bearings 44 are installed into the upper left rotating seat 24, and the rotating seat covers (43, 47) are installed on both sides. The left end of the upper left rotating seat 24 is installed on the upper right side of the frame 29, and the left end of the upper left rotating shaft 46 extends into the hole on the upper right side of the frame 29; the lower left rotating shaft 56 is fitted into the inner holes of a pair of deep groove ball bearings 57 on both sides, the deep groove ball bearings 57 are installed into the lower left rotating seat 30, and the rotating seat covers (58, 59) are installed on both sides. The left end of the lower left rotating seat 30 is installed on the lower right side of the frame 29, and the left end of the lower left rotating shaft 56 extends into the hole on the lower right side of the frame 29; two synchronous pulleys (53, 54) are fitted in the middle of the middle rotating shaft 51, and the upper left rotating shaft 46... The left end of 6 is fitted with a timing pulley 45, and the left end of the lower left rotating shaft 56 is fitted with a timing pulley 55. The mating surfaces are limited by flat keys. The two timing belts 28 are respectively fitted on the two pairs of timing pulleys (45, 54) and (53, 55) to form a mating relationship. On the far right are three sets of identical driven rotating devices. The three right-hand rotating shafts 34 are respectively installed in the inner holes of three pairs of deep groove ball bearings 36. The three pairs of deep groove ball bearings 36 are respectively installed in three right-hand rotating seats (14, 15, 16). Three pairs of rotating seat covers (33, 35) are respectively installed on both sides. The left ends of the three right-hand rotating seats (14, 15, 16) are respectively installed on the right side of the swing frame 17. The left ends of the three right-hand rotating shafts 34 extend into the upper, middle and lower holes on the right side of the swing frame 17.The six clamping sleeves 31 on the left and right sides are of the same specification. The left end holes of the three left clamping sleeves 31 are respectively fitted onto the right ends of the upper left rotating shaft 46, the middle rotating shaft 51, and the lower left rotating shaft 56, and are locked with bolts. The right end holes of the three right clamping sleeves 31 are respectively fitted onto the left ends of the three right-hand rotating shafts 34, and are locked with bolts.

[0030] The method and procedures for the high and low temperature environment durability test of the constant velocity universal joint sealing cover are as follows:

[0031] ① Adjust the upper swing arm 19 and lower swing arm 9 of the large swing mechanism to rotate parallel to the axis of the variable frequency motor 23, and adjust the swing frame 17 of the small swing mechanism to rotate parallel to the axis of the variable frequency motor 23, so that the large swing mechanism and the small swing mechanism return to their initial positions.

[0032] ② Based on the specifications and dimensions of the constant velocity universal joint 32 tested, adjust the sliding block 10 by moving it left and right on the lower swing arm 9, adjust the upper sliding block 39 by moving it left and right on the upper swing arm 19, adjust the internal hexagonal shaft 68 by moving it left and right outside the external hexagonal shaft 11, and adjust the swing bracket 17 by moving it left and right between the upper base plate 18 and the lower base plate 66, so that the universal joint rotation center on the input shaft 60 side of the constant velocity universal joint 32 to be installed is aligned with the center of the large swing shaft 41 and the hollow shaft 85, and the universal joint rotation center on the output shaft 65 side of the constant velocity universal joint 32 is aligned with the center of the upper swing shaft 37 and the lower swing shaft 74. Align the center; fix the lower slide seat 10 with bolts in the U-shaped grooves on both sides of the lower swing arm 9, fix the upper slide seat 39 with bolts in the U-shaped grooves on both sides of the upper swing arm 19, and fix the upper slide seat 39 to the base plate (18, 66) with bolts in the U-shaped grooves on both sides of the upper and lower ends of the swing frame 17; respectively install the input shaft 60 of the three constant velocity universal joints 32 into the right side holes of the three clamping sleeves 31 on the left side and lock them with bolts; respectively install the output shaft 65 of the three constant velocity universal joints 32 into the left side holes of the three clamping sleeves 31 on the right side and lock them with bolts; install the three constant velocity universal joints 32 in the middle of the rotating mechanism;

[0033] ③ The servo motor 3 of the small pendulum mechanism is started, which drives the pendulum frame 17 to swing through the reducer 5, coupling 93, long straight shaft 86, bevel gears (79, 78), external hexagonal shaft 11, internal hexagonal shaft 68, bevel gears (71, 72), lower pendulum shaft 74, lower base plate 66, upper base plate 18, and upper pendulum shaft 37. The swing angle and frequency of the pendulum frame 17 are controlled according to the test requirements, that is, the swing angle and frequency of the output shaft 65 of the constant velocity universal joint 32 relative to the intermediate shaft 63. The servo motor 4 of the large pendulum mechanism is started, which drives the pendulum frame 17 to swing through the reducer 6, synchronous pulleys (92, 89), synchronous belt 90, and connecting ring 88. The hollow shaft 85 and the large swing shaft 41 drive the lower swing rod 9 and the upper swing rod 19 to swing, causing the small swing mechanism to swing as a whole. The swing angle and frequency of the lower swing rod 9 and the upper swing rod 19 are controlled according to the test requirements, that is, the swing angle and frequency of the constant velocity universal joint 32 input shaft 60 relative to the intermediate shaft 63. The variable frequency motor 23 of the rotating mechanism is started, which drives the constant velocity universal joint 32 to rotate at the speed required by the test through the coupling 25, the intermediate rotating shaft 51, the synchronous pulleys (53, 54, 45, 55), the synchronous belt 28, the upper left rotating shaft 46, the lower left rotating shaft 56, the clamping sleeve 31, and the right rotating shaft 34.

[0034] ④ The large swing mechanism, small swing mechanism, and rotating mechanism operate continuously at the same time, driving the constant velocity universal joint 32 to swing and rotate. During the test, the temperature of the high and low temperature chamber 1 is adjusted as required to conduct a high and low temperature environment durability test on the sealing cover (62, 64) of the constant velocity universal joint 32. Observe through the glass door of the high and low temperature chamber 1. When the sealing cover (62, 64) of the constant velocity universal joint 32 shows signs of breakage, grease leakage, or other damage, the machine should be stopped and the constant velocity universal joint 32 should be removed for inspection.

[0035] ⑤ When testing the telescopic ball cage constant velocity universal joint 32, since its input shaft 60 can move axially to the left and right relative to the cylindrical shell 61, the total length of the constant velocity universal joint 32 is variable. To verify this function, when installing the telescopic ball cage constant velocity universal joint 32, the universal joint rotation center on the input shaft 60 side and the center of the large swing shaft 41 and the hollow shaft 85 can be offset to the left and right to a certain extent. In this way, while the large swing mechanism is swinging, there will be relative left and right movement between the cylindrical shell 61 and the input shaft 60.

[0036] ⑥ For constant velocity universal joints 32 of different specifications and sizes, only the clamping sleeve 31 with the same size needs to be replaced to conduct the test;

[0037] ⑦ Based on this test bench, by connecting loading mechanisms to the right ends of the three right-hand shafts 34 of the rotating mechanism, such as a servo motor working in torque mode to perform reverse loading, a reverse load is applied to the output shaft of the constant velocity universal joint 32, and various comprehensive performance tests of the constant velocity universal joint 32 can be carried out.

Claims

1. The constant velocity universal joint sealing cover high and low temperature environment durability test bench mainly consists of a frame, high and low temperature chamber, large pendulum mechanism, small pendulum mechanism, rotation mechanism, and constant velocity universal joint; its characteristics are: The test bench is a frame structure. The high and low temperature chamber is installed in the middle of the test bench. There are three holes on the top, bottom and left side of the high and low temperature chamber, which minimizes contact with the external environment and allows for more effective adjustment and control of high and low temperatures. The large swing mechanism is mounted on the test bench, and its actuator extends into the high and low temperature chamber through the top and bottom holes. The small swing mechanism is installed in the middle of the large swing mechanism, and its actuator is placed in the high and low temperature chamber. The rotating mechanism is mounted on the test bench, and its actuator extends into the high and low temperature chamber through the left hole. The constant velocity universal joint is installed in the rotating mechanism.

2. The high and low temperature environment durability test bench for the constant velocity universal joint sealing cover according to claim 1, characterized in that: The large swing mechanism mainly consists of a support frame, a servo motor, a reducer, a base, a synchronous pulley, a synchronous belt, an adapter ring, a lower swing seat, a deep groove ball bearing, a swing seat cover, a hollow shaft, a lower swing rod, an upper swing seat, an upper swing rod, and a large swing shaft. The support frame is U-shaped, with its upright surface fixed to the front side of the rear panel of the platform, located at the rear of the high and low temperature chamber. The base is fixed to the rear of the lower end face of the support frame. The front end face of the servo motor is fixed to the rear end face of the reducer, and the servo motor shaft is installed in the input hole of the reducer. The front end face of the reducer is installed at the lower end of the base, and the reducer shaft passes through the hole at the lower end of the base. The synchronous pulley is fitted onto the reducer shaft, and the mating surfaces are limited by a flat key. The lower swing seat is fixed in the hole on the bottom surface of the support frame, and the upper end of the lower swing seat... The hole extending into the bottom of the high and low temperature chamber is sealed with thermal insulation material. A pair of deep groove ball bearings are installed in the lower swing seat, and swing seat covers are installed at both ends. The hollow shaft is fitted into the inner hole of the deep groove ball bearing, and the lower end of the hollow shaft is fixed to the upper end of the adapter ring. The synchronous pulley is fitted onto the outer circle of the adapter ring, and the mating surface is limited by a flat key. The synchronous belt is fitted onto the two synchronous pulleys to form a mating relationship. The lower swing rod is fitted and fixed to the upper end of the hollow shaft through the hole. The upper swing seat is fixed in the hole on the upper end face of the support frame. The lower end of the upper swing seat extends into the hole on the top of the high and low temperature chamber, and the hole is sealed with thermal insulation material. The upper swing seat contains a deep groove ball bearing, and the upper end is fitted with a swing seat cover. The large swing shaft is fitted into the inner hole of the deep groove ball bearing, and the upper swing rod is fitted and fixed to the lower side of the large swing shaft through the hole. The upper and lower swing rods are parallel and symmetrical.

3. The high and low temperature environment durability test bench for the constant velocity universal joint sealing cover according to claim 1, characterized in that: The aforementioned small swing mechanism mainly consists of a servo motor, a reducer, a connecting seat, a synchronous pulley, a coupling, a long straight shaft, a hollow shaft, a tapered roller bearing, a transition ring, a bearing cover, a lower swing frame, a lower swing rod, a swing frame cover, a bevel gear, an external hexagonal shaft, an internal hexagonal shaft, a lower slide seat, a slide cover, a small swing seat, a swing seat cover, a lower swing shaft, a lower base plate, an upper slide seat, an upper swing rod, a deep groove ball bearing, an upper swing shaft, an upper base plate, and a swing frame. The front end of the servo motor is fixed to the rear end of the reducer, and the servo motor shaft is installed in the input hole of the reducer. The two ends of the connecting seat are fixed to the end faces of the reducer and the synchronous pulley, respectively. The synchronous pulley is fitted onto the outer circle of the transition ring, and the lower end of the hollow shaft is fixed to the upper end of the transition ring. The lower end of the long straight shaft passes through the inner hole of the connecting ring. The two holes on both sides of the coupling are respectively fitted onto the output shaft of the reducer and the lower end of the long straight shaft. The mating surfaces are limited by flat keys. A pair of tapered roller bearings are installed in the hollow shaft hole. The long straight shaft is fitted into the inner hole of the tapered roller bearing. A bearing cover is installed on the upper end of the hollow shaft. The lower swing frame is fixed to the upper end face of the hole of the lower swing rod. Swing frame covers are installed on both sides of the lower swing frame. A pair of tapered roller shafts are installed in the holes of the swing frame covers. The left round shaft of the external hexagonal rotating shaft is fitted into the inner hole of the tapered roller bearing. The bevel gear is installed on the upper end of the long straight shaft. The bevel gear is installed on the stepped end face of the left round shaft of the external hexagonal rotating shaft. The mating surfaces are limited by flat keys. The two bevel gears are meshed. The lower slide seat is installed on the upper surface of the lower swing rod by a flat key guide. The sliding seat can be moved left and right to adjust its position. The sliding seat is fixed by bolts in the U-shaped grooves on both sides of the lower swing arm. Slide covers are installed on both sides of the sliding seat, and a pair of tapered roller bearings are installed in the holes of the slide covers. The hexagonal inner hole of the internal hexagonal shaft is fitted onto the right hexagonal shaft of the external hexagonal shaft. The internal hexagonal shaft can be moved left and right to adjust its position. The outer diameters of the internal hexagonal shaft are fitted into the inner holes of the tapered roller bearings. A small swing seat is installed on the upper end face of the sliding seat, containing a pair of tapered roller bearings. A swing seat cover is installed at the upper end, and the lower swing shaft is fitted into the inner hole of the tapered roller bearings. A bevel gear is installed on the left stepped end face of the outer diameter of the internal hexagonal shaft and at the lower end of the lower swing shaft. All mating surfaces are limited by flat keys. The gears are meshed. The lower base plate is mounted on the upper end of the lower swing shaft through the center hole, and the mating surface is limited by a flat key. The upper slide is mounted on the lower surface of the upper swing rod through a flat key. The upper slide can be moved left and right to adjust its position. The upper slide is fixed by bolts in the U-shaped grooves on both sides of the upper swing rod. The upper slide contains a deep groove ball bearing, and the lower end is fitted with a slide cover. The upper swing shaft is fitted into the inner hole of the deep groove ball bearing. The upper base plate is mounted on the lower end of the upper swing shaft through the center hole, and the mating surface is limited by a flat key. The swing frame is U-shaped. The rectangular grooves on the upper and lower sides of the swing frame are respectively fitted into the square bosses on the upper and lower base plates. The swing frame can be moved left and right to adjust its position. It is fixed to the upper and lower base plates by bolts in the U-shaped grooves on both sides of the upper and lower ends of the swing frame.

4. The high and low temperature environment durability test bench for the constant velocity universal joint sealing cover according to claim 1, characterized in that: The rotating mechanism mainly consists of a frequency converter motor, coupling, rotating shaft seat, tapered roller bearing, rotating shaft cover, intermediate rotating shaft, square frame, upper left rotating seat, middle left rotating seat, lower left rotating seat, rotating seat cover, deep groove ball bearing, upper left rotating shaft, lower left rotating shaft, synchronous pulley, synchronous belt, right rotating seat, right rotating shaft, and clamping sleeve. The frequency converter motor is fixed on the platform on the upper left of the frame, and the rotating shaft seat is fixed on the vertical surface with the opening in the middle of the frame. The right end of the rotating shaft seat extends into the hole on the left side of the high and low temperature chamber, and the gap is sealed with heat insulation material. A pair of tapered roller bearings are installed in the rotating shaft seat, and rotating shafts are installed on both sides. The cover, the middle rotating shaft is fitted into the inner hole of the tapered roller bearing from the left side, the two holes on both sides of the coupling are respectively fitted into the output shaft of the frequency converter motor and the left end of the middle rotating shaft, and the mating surfaces are limited by a flat key; the hole on the left side of the square frame fits onto the rotating shaft cover and is fixed to the right side of the rotating shaft seat; the right side of the middle rotating shaft is fitted into the inner hole of the tapered roller bearing, the tapered roller bearing is installed into the left middle rotating seat, the left end of the left middle rotating seat is installed in the middle of the right side of the square frame, and the middle rotating shaft passes through the holes in the middle of the left and right sides of the square frame; the two sides of the upper left rotating shaft are fitted into the inner holes of a pair of deep groove ball bearings, the deep groove ball bearings are installed into the upper left rotating seat, the rotating seat covers are installed on both sides, and the upper left rotating seat is on the left side. The upper left rotating shaft is mounted on the upper right side of the frame, with its left end extending into the hole on the upper right side of the frame. The lower left rotating shaft is fitted with a pair of deep groove ball bearings on both sides, with the bearings inserted into the lower left rotating seat. Rotating seat covers are mounted on both sides. The left end of the lower left rotating seat is mounted on the lower right side of the frame, and the left end of the lower left rotating shaft extends into the hole on the lower right side of the frame. Two synchronous pulleys are fitted in the middle of the central rotating shaft. A synchronous pulley is fitted on the left end of the upper left rotating shaft and the left end of the lower left rotating shaft. All mating surfaces are limited by flat keys. Two synchronous belts are respectively fitted onto the two pairs of synchronous pulleys, forming a mating relationship. On the far right are three sets of... The driven rotating device has three right-hand rotating shafts installed in the inner holes of three pairs of deep groove ball bearings on both sides. The three pairs of deep groove ball bearings are installed in three right-hand rotating seats, and three pairs of rotating seat covers are installed on both sides. The left ends of the three right-hand rotating seats are installed on the right side of the swing frame. The left ends of the three right-hand rotating shafts extend into the upper, middle, and lower holes on the right side of the swing frame. The six clamping sleeves on the left and right sides are of the same specification. The left end holes of the three clamping sleeves on the left side are respectively fitted onto the right ends of the upper left rotating shaft, the middle rotating shaft, and the lower left rotating shaft, and are locked with bolts. The right end holes of the three clamping sleeves on the right side are respectively fitted onto the left ends of the three right-hand rotating shafts and are locked with bolts.

5. The method and procedure for high and low temperature environment durability test of constant velocity universal joint sealing cover, characterized by: ① Adjust the upper and lower swing arms of the large swing mechanism to be parallel to the axis of the variable frequency motor, and adjust the swing frame of the small swing mechanism to be parallel to the axis of the variable frequency motor, so that the large and small swing mechanisms return to their initial positions; ② According to the specifications of the constant velocity universal joint being tested, adjust the sliding block by moving it left and right on the lower swing arm, and adjust the upper sliding block by moving it left and right on the upper swing arm. Adjust the internal hexagonal shaft by moving it left and right outside the external hexagonal shaft, and adjust the swing frame by moving it left and right between the upper and lower base plates, so that the rotation center of the universal joint on the input shaft side of the constant velocity universal joint to be installed is aligned with the center of the large swing shaft and the hollow shaft, and the rotation center of the universal joint on the output shaft side of the constant velocity universal joint is aligned with the center of the upper and lower swing shafts; fix the sliding block with bolts in the U-shaped grooves on both sides of the lower swing arm. The upper slide is fixed to the base by bolts in the U-shaped grooves on both sides of the upper swing arm, and fixed to the base plate by bolts in the U-shaped grooves on both sides of the upper and lower ends of the swing frame; the three constant velocity universal joint input shafts are respectively fitted into the right side holes of the three clamping sleeves on the left and locked with bolts, and the three constant velocity universal joint output shafts are respectively fitted into the left side holes of the three clamping sleeves on the right and locked with bolts. The three constant velocity universal joints are installed in the middle of the rotating mechanism; ③ Start the servo motor of the small swing mechanism, which drives the swing frame to swing through the reducer, coupling, long straight shaft, bevel gear, external hexagonal shaft, internal hexagonal shaft, bevel gear, lower swing shaft, lower base plate, upper base plate, and upper swing shaft. Control the swing angle and frequency of the swing frame according to the test requirements, that is, the swing angle and frequency of the constant velocity universal joint output shaft relative to the intermediate shaft. The servo motor of the large swing mechanism is started, which drives the lower and upper swing arms to swing through the reducer, synchronous pulley, synchronous belt, connecting ring, hollow shaft, and large swing shaft, causing the small swing mechanism to swing as a whole. The swing angle and frequency of the lower and upper swing arms are controlled according to the test requirements, that is, the swing angle and frequency of the constant velocity universal joint input shaft relative to the intermediate shaft. The frequency converter motor of the rotating mechanism is started, which drives the constant velocity universal joint to rotate at the speed required by the test through the coupling, intermediate rotating shaft, synchronous pulley, synchronous belt, upper left rotating shaft, lower left rotating shaft, clamping sleeve, and right rotating shaft. The large swing mechanism, small swing mechanism, and rotating mechanism run continuously at the same time, driving the constant velocity universal joint to swing and rotate. During the test, the temperature of the high and low temperature chamber is adjusted as required to ensure the constant velocity universal joint is functioning correctly. For the high and low temperature environment durability test of the sealing cover, observe through the glass door of the high and low temperature chamber. If the sealing cover of the constant velocity universal joint shows signs of damage such as breakage or grease leakage, the machine should be stopped and the constant velocity universal joint should be removed for inspection. ⑤ When testing the telescopic ball cage type constant velocity universal joint, since its input shaft can move axially left and right relative to the cylindrical shell, the total length of the constant velocity universal joint is variable. To verify this function, when installing the telescopic ball cage type constant velocity universal joint, the rotation center of the universal joint on the input shaft side and the center of the large swing shaft and the hollow shaft can be offset to the left and right by a certain amount. In this way, while the large swing mechanism is swinging, there will be relative left and right movement between the cylindrical shell and the input shaft. ⑥ For constant velocity universal joints of different specifications and sizes, only the clamping sleeve with the appropriate size needs to be replaced for testing.⑦ By making slight modifications to this test bench, and connecting loading mechanisms to the right ends of the three right-hand shafts of the rotating mechanism, such as using a servo motor operating in torque mode to apply reverse loading to the output shaft of the constant velocity universal joint, comprehensive performance tests of the constant velocity universal joint can be performed.

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