A device for detecting the tightness of a constant velocity joint assembly

Abstract

The present invention relates to the technical field of qualified detection in the production of constant velocity joints, and discloses a detection device for the tightness of constant velocity joint assembly, which includes a workbench. The workbench is provided with two jigs respectively used for connecting the real shaft rod and the tail rod on the constant velocity joint. The jig on one side of the real shaft rod is a fixed jig arranged on the output part, and the jig on one side of the tail rod is an internal spline arranged on the detection part. The output part includes a sliding seat and a lifting device arranged on the sliding seat. The telescopic rod of the lifting device is connected to a torque output device. The fixed jig is fixedly connected to the output shaft of the torque output device. The detection part includes a support seat fixedly connected to the workbench. A torque measuring instrument is rotatably connected to the support seat. The torque detection end of the torque measuring instrument far away from the support seat is connected to one side of a rotating seat. A hollow cylinder is arranged on the other side of the rotating seat, and the internal spline is arranged at the end of the hollow cylinder, which can accurately detect the tightness in the circumferential direction of the inner circle of the constant velocity joint under different inclination conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of qualified detection in the production of constant velocity joints, and particularly to a detection device for the tightness of constant velocity joint assembly. Background Art

[0002] As a key component in the automotive drive system, the constant velocity joint mainly functions to stably and efficiently transmit power between different axes and allows the drive shaft to flexibly change within a certain angle range. During the operation of the vehicle, the constant velocity joint needs to withstand the strong torque from the engine and the impacts and vibrations brought by various complex road conditions.

[0003] The constant velocity joint includes an outer star wheel, an inner star wheel, a cage, and balls. A tail rod is provided on the outer star wheel, an internal spline is provided on the inner side of the inner star wheel, an external spline is provided at the end of the solid shaft rod and is slidably connected to the inner star wheel. A ring groove is also provided at the end of the solid shaft rod for installing a clamp, so that after the solid shaft rod passes through the inner star wheel, the solid shaft rod is fixed inside the inner star wheel by the clamp.

[0004] The tightness of the constant velocity joint directly affects its transmission efficiency, working noise, and service life. During the automobile manufacturing process, the accurate detection of the tightness of the constant velocity joint is an important link to ensure product quality. Traditional detection methods often rely on manual experience, by manually rotating the constant velocity joint and judging its tightness by hand feeling. This detection method has low accuracy and reliability.

[0005] A detection device for the tightness of constant velocity joint assembly with the patent publication number CN204694389U and an integrated machine for the assembly and tightness detection of an outer constant velocity joint with the patent publication number CN205764848U respectively disclose the detection methods for the tightness of the constant velocity joint, but both have the following defects: lacking the detection of the tightness in the inner circumferential direction of the constant velocity joint; lacking the detection of the tightness of the constant velocity joint at different inclined angles. Summary of the Invention

[0006] (I) Technical Problems to be Solved

[0007] In view of the deficiencies of the prior art, the present invention provides a detection device for the tightness of constant velocity joint assembly, which has the advantage of accurately detecting the tightness in the inner circumferential direction of the constant velocity joint under different inclined conditions, and solves the problems in the prior art of lacking the detection of the tightness in the inner circumferential direction of the constant velocity joint and lacking the detection of the tightness of the constant velocity joint at different inclined angles.

[0008] (II) Technical Solutions

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] A caged universal joint assembly tightness detection device, comprising a workbench, the workbench is provided with two jigs respectively used for connecting the real shaft rod and the tail rod on the caged universal joint, the jig on one side of the real shaft rod is a fixed jig arranged on the output part, the jig on one side of the tail rod is an internal spline arranged on the detection part, the output part includes a sliding seat and a lifting device arranged on the sliding seat, the telescopic rod of the lifting device is connected to a torque output device, the fixed jig is fixedly connected to the output shaft of the torque output device, the detection part includes a support seat fixedly connected to the workbench, a torque measuring instrument is rotatably connected to the support seat, the torque detection end of the torque measuring instrument away from the support seat is connected to one side of a rotating seat, a hollow cylinder is arranged on the other side of the rotating seat, the internal spline is arranged at the end of the hollow cylinder, and the internal spline is provided with an internal spline groove meshing with the external spline on the tail rod;

[0011] The torque output device transmits an input torque value to the real shaft rod through the fixed jig, the torque measuring instrument is used to detect the output torque value conducted from the tail rod to the hollow cylinder, record the time duration from when the torque output device starts to input torque to when the output torque value detected by the torque measuring instrument is closest to the input torque value of the torque output device, and judge the size of the gap in the caged universal joint along the rotation direction according to the time duration. At the same time, when the lifting device controls the lifting of the torque output device, the angle between the real shaft rod and the tail rod can be changed, so as to detect the tightness of the caged universal joint at different inclination angles.

[0012] Preferably, a drawing detection device is arranged on one side of the rotating seat inside the hollow cylinder, the drawing detection device is used to detect the drawing tightness of the caged universal joint when the output part is lifted, the drawing detection device includes a tensile force measuring instrument fixed on the rotating seat, the side of the tensile force measuring instrument away from the rotating seat is fixedly connected to a sleeve seat through a spring, a threaded sleeve is rotatably connected to the side of the sleeve seat away from the tensile force measuring instrument, and an internal thread meshing with the external thread at the end of the tail rod is arranged inside the threaded sleeve;

[0013] The end of the tail rod is fixed inside the threaded sleeve by a thread. When the lifting device pushes the torque output device and the fixed jig to lift, the real shaft rod moves upward horizontally, the tail rod tilts upward and slides outward relative to the hollow cylinder. At this time, the tail rod drives the threaded sleeve to pull the spring, so as to detect the tension generated by the spring through the tensile force measuring instrument. When the increase in the tension detected by the tensile force measuring instrument is synchronized with the lifting and lowering of the output part, it indicates that the axial tightness of the caged universal joint is relatively tight. When there is a delay between the increase in the tension detected by the tensile force measuring instrument and the lifting and lowering of the output part, it indicates that the axial tightness of the caged universal joint is relatively loose.

[0014] Preferably, a plurality of jacks are arranged on the outer circumference of the threaded sleeve, and a sliding groove is arranged on the hollow cylinder at the position corresponding to the threaded sleeve. By inserting a plug rod into the sliding groove and the jacks and then rotating the threaded sleeve, the threaded sleeve can be screwed tightly to the end of the tail rod.

[0015] Preferably, the sliding groove is composed of a plurality of vertical grooves and at least one horizontal groove. The sliding direction of the vertical groove is perpendicular to the sliding direction of the tail rod, and the sliding direction of the horizontal groove is parallel to the sliding direction of the tail rod. The horizontal groove is connected between two adjacent vertical grooves.

[0016] Preferably, a rotating ring is also rotatably connected at the position of the threaded sleeve inside the hollow cylinder. The rotating ring fits on the inner wall of the hollow cylinder and is restricted from sliding in the hollow cylinder by a key or a boss. A long hole is circumferentially arranged on the rotating ring, and the length of the long hole is equal to the total length of the horizontal groove. After passing through the sliding groove, the insertion rod first passes through the long hole on the rotating ring and then is inserted into the insertion hole. The rotating ring is used to block sundries entering the hollow cylinder from the sliding groove. At the same time, the rotating ring can improve the anti-torsion ability of the hollow cylinder after grooving, avoid deformation of the hollow cylinder when transmitting torque and affecting accuracy. At the same time, when detecting the tightness by torque, inserting the insertion rod into the vertical groove, the long hole and the insertion hole can prevent the tail rod from sliding. The inner raceway of the ball cage universal joint is arc-shaped, and an axial force is easily generated when applying torque, causing the tail rod to slide relative to the solid shaft rod. Reducing the sliding of the tail rod can, on the one hand, avoid applying pressure to the spring during torque testing and causing spring fatigue, and on the other hand, avoid the influence of vibrations generated during the sliding of the tail rod on torque detection.

[0017] Preferably, the sliding seat is slidably connected in the slide rail. The slide rail is detachably fixed to the workbench by bolts. A lead screw is arranged in the slideway of the slide rail. The lead screw passes through the sliding seat, and the sliding seat is provided with an internal thread meshing with the lead screw in the through hole corresponding to the position where the lead screw passes through. Support devices are arranged at both ends of the lead screw, and one end of the lead screw passes through the support device and is connected with a rotating wheel.

[0018] Preferably, the lifting device is a wire-pulling oil cylinder. A linear displacement sensor is arranged inside the oil cylinder. The wire-pulling displacement sensor is connected to the piston rod of the oil cylinder through a wire. When the telescopic rod expands and contracts, the wire is pulled, and the mechanical device or electronic component inside the sensor converts the linear displacement of the wire into an electrical signal, thereby measuring the pushing distance of the piston rod. The wire-pulling oil cylinder can control the expansion and contraction distance of the telescopic rod.

[0019] Preferably, the torque output device is a servo motor, which can control the rotation speed and position of the output shaft according to the magnitude and direction of the control signal, thereby controlling the torque.

[0020] Preferably, the telescopic direction of the lifting device is perpendicular to the center line of the output shaft of the torque output device; the sliding direction of the sliding seat is parallel to the center line of the output shaft of the torque output device; the sliding direction of the sliding seat is perpendicular to the telescopic direction of the lifting device.

[0021] Preferably, the total span angle at both ends of the sliding groove in the circumferential direction of the outer surface of the hollow cylinder is less than or equal to 120 degrees.

[0022] (III) Beneficial Effects

[0023] Compared with the prior art, the present invention provides a device for detecting the tightness of a constant velocity joint assembly, which has the following beneficial effects:

[0024] 1. For the device for detecting the tightness of a constant velocity joint assembly, by setting a torque output device to transmit an input torque value to the solid shaft rod, and then using a torque measuring instrument to detect the output torque value conducted from the tail rod to the hollow cylinder, and recording the duration from when the torque output device starts to input torque to when the output torque value detected by the torque measuring instrument is closest to the input torque value of the torque output device. According to the duration, the size of the gap in the circumferential rotation direction inside the constant velocity joint is judged. At the same time, when the lifting device controls the lifting and lowering of the torque output device, the angle between the solid shaft rod and the tail rod can be changed, so as to detect the tightness of the constant velocity joint at different inclination angles.

[0025] 2. For the device for detecting the tightness of a constant velocity joint assembly, a pulling detection device is provided. The end of the tail rod is fixed by a threaded sleeve. When the lifting device pushes the torque output device and the fixing fixture to lift, the solid shaft rod moves upward, the tail rod tilts upward and slides outward relative to the hollow cylinder. At this time, the tail rod drives the threaded sleeve to pull the spring, and a tensile force measuring instrument detects the tensile force generated by the spring. When the increase in the tensile force detected by the tensile force measuring instrument is synchronized with the lifting and lowering of the output part, it indicates that the tightness of the constant velocity joint in the axial direction is relatively tight. When there is a delay between the increase in the tensile force detected by the tensile force measuring instrument and the lifting and lowering of the output part, it indicates that the tightness of the constant velocity joint in the axial direction is relatively loose.

[0026] 3. For the device for detecting the tightness of a constant velocity joint assembly, a rotating ring is also rotatably connected at the position of the threaded sleeve inside the hollow cylinder. Long holes are circumferentially arranged on the rotating ring. After the inserting rod passes through the sliding groove, it first passes through the long holes on the rotating ring and then inserts into the jack. The rotating ring can not only block the sundries entering the hollow cylinder from the sliding groove, but also improve the anti-torsion ability of the hollow cylinder after grooving, avoiding deformation of the hollow cylinder when transmitting torque and affecting the accuracy. At the same time, when detecting the tightness through torque, inserting the inserting rod into the vertical groove, long holes and jacks can prevent the tail rod from sliding. The inner ball track of the constant velocity joint is arc-shaped, and axial force is easily generated when applying torque, causing the tail rod and the solid shaft rod to slide. Reducing the sliding of the tail rod can, on the one hand, avoid applying pressure to the spring during torque testing and causing spring fatigue, and on the other hand, avoid the influence of the vibration generated during the sliding of the tail rod on torque detection. Description of the Drawings

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0028] Figure 2 It is a schematic diagram of the structure of the output part of the present invention.

[0029] Figure 3 It is a schematic diagram of the structure of the detection part of the present invention.

[0030] Figure 4 This is an exploded view of the detection part of the present invention.

[0031] Figure 5 This is a schematic structural diagram of the drawing detection device of the present invention.

[0032] Figure 6 This is a schematic structural diagram of the hollow cylinder of the present invention.

[0033] Figure 7 This is a schematic structural diagram of the rotating ring of the present invention.

[0034] Figure 8 This is a sectional view of the present invention.

[0035] In the figure: 1, workbench; 2, constant velocity joint; 3, output part; 4, detection part; 5, drawing detection device; 6, rotating ring; 21, solid shaft rod; 22, tail rod; 31, slide rail; 32, slide block; 33, lifting device; 34, torque output device; 35, fixed fixture; 311, lead screw; 312, runner; 41, support seat; 42, torque measuring instrument; 43, rotating seat; 44, hollow cylinder; 45, internal spline; 441, sliding groove; 4411, vertical groove; 4412, horizontal groove; 51, tensile force measuring instrument; 52, spring; 53, socket; 54, threaded sleeve; 541, jack; 61, long hole. Detailed implementation manners

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0038] In addition, fixed connection means that after the parts or components are fixed, there is no relative movement; transmission connection means a connection method that transmits mechanical motion or torque to other working parts through transmission parts; sliding connection means a connection method in which two objects are in contact but not fixed and can slide relative to each other; rotational connection means a connection method in which two objects are in contact but not fixed and can rotate relative to each other.

[0039] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more, unless otherwise specifically defined.

[0040] Embodiment 1:

[0041] This embodiment provides a device for detecting the tightness of a constant velocity joint assembly, having the following technical features.

[0042] Please refer to Figure 1-8 , a device for detecting the tightness of a constant velocity joint assembly, including a workbench 1. The workbench 1 is provided with two jigs respectively for connecting the real shaft rod 21 and the tail rod 22 on the constant velocity joint 2. The jig on one side of the real shaft rod 21 is a fixed jig 35 provided on the output part 3, and the jig on one side of the tail rod 22 is an internal spline 45 provided on the detection part 4. The output part 3 includes a slide base 32 and a lifting device 33 provided on the slide base 32. The telescopic rod of the lifting device 33 is connected to a torque output device 34. The fixed jig 35 is fixedly connected to the output shaft of the torque output device 34. The detection part 4 includes a support base 41 fixedly connected to the workbench 1. A torque measuring instrument 42 is rotatably connected to the support base 41. The torque detection end of the torque measuring instrument 42 away from the support base 41 is connected to one side of a rotating seat 43. The other side of the rotating seat 43 is provided with a hollow cylinder 44. The internal spline 45 is provided at the end of the hollow cylinder 44. The internal spline 45 is provided with an internal spline groove that meshes with the external spline on the tail rod 22;

[0043] The torque output device 34 transmits an input torque value to the real shaft rod 21 through the fixed jig 35. The torque measuring instrument 42 is used to detect the output torque value conducted from the tail rod 22 to the hollow cylinder 44, record the duration between when the torque output device 34 starts to input torque and when the output torque value detected by the torque measuring instrument 42 is closest to the input torque value of the torque output device 34, and judge the size of the gap in the constant velocity joint 2 along the rotation direction according to the duration. At the same time, when the lifting device 33 controls the lifting of the torque output device 34, the angle between the real shaft rod 21 and the tail rod 22 can be changed, so as to detect the tightness of the constant velocity joint 2 at different inclination angles.

[0044] In an alternative embodiment, a drawing detection device 5 is provided on one side of the rotating seat 43 inside the hollow cylinder 44. The drawing detection device 5 is used to detect the drawing tightness of the constant velocity joint 2 when the output part 3 is lifted. The drawing detection device 5 includes a tensile force measuring instrument 51 fixed on the rotating seat 43. One side of the tensile force measuring instrument 51 away from the rotating seat 43 is fixedly connected to a sleeve seat 53 through a spring 52. A threaded sleeve 54 is rotatably connected to one side of the sleeve seat 53 away from the tensile force measuring instrument 51. An internal thread that meshes with the external thread at the end of the tail rod 22 is provided inside the threaded sleeve 54;

[0045] The end of the tail rod 22 is fixed inside the threaded sleeve 54 by threads. When the lifting device 33 pushes the torque output device 34 and the fixed fixture 35 to lift, the solid shaft rod 21 moves upward horizontally, the tail rod 22 tilts upward and slides outward relative to the hollow cylinder 44. At this time, the tail rod 22 drives the threaded sleeve 54 to pull the spring 52, so as to detect the tensile force generated by the spring 52 through the tensile force measuring instrument 51. When the increase in the tensile force detected by the tensile force measuring instrument 51 is synchronized with the lifting and lowering of the output part 3, it indicates that the axial tightness of the constant velocity joint 2 is relatively tight. When there is a delay between the increase in the tensile force detected by the tensile force measuring instrument 51 and the lifting and lowering of the output part 3, it indicates that the axial tightness of the constant velocity joint 2 is relatively loose.

[0046] In an alternative embodiment, a plurality of jacks 541 are provided on the outer circumference of the threaded sleeve 54. The hollow cylinder 44 is provided with a sliding groove 441 at a position corresponding to the threaded sleeve 54. By inserting a plug rod into the sliding groove 441 and the jacks 541 and then rotating the threaded sleeve 54, the threaded sleeve 54 is screwed tightly to the end of the tail rod 22.

[0047] In an alternative embodiment, the sliding groove 441 is composed of a plurality of vertical grooves 4411 and at least one horizontal groove 4412. The sliding direction of the vertical groove 4411 is perpendicular to the sliding direction of the tail rod 22, and the sliding direction of the horizontal groove 4412 is parallel to the sliding direction of the tail rod 22. The horizontal groove 4412 is connected between two adjacent vertical grooves 4411.

[0048] In an alternative embodiment, a rotating ring 6 is rotatably connected at the position of the internal threaded sleeve 54 inside the hollow cylinder 44. The rotating ring 6 fits against the inner wall of the hollow cylinder 44 and is restricted from sliding within the hollow cylinder 44 by a convex key or boss. A long hole 61 is circumferentially provided on the rotating ring 6, and the length of the long hole 61 is equal to the total length of the transverse groove 4412. The insertion rod passes through the sliding groove 441 and then through the long hole 61 on the rotating ring 6 before being inserted into the insertion hole 541. The rotating ring 6 is used to block debris entering the hollow cylinder 44 from the sliding groove 441. At the same time, the rotating ring 6 can improve the anti-twisting ability of the hollow cylinder 44 after grooving, avoiding deformation of the hollow cylinder 44 when transmitting torque and affecting accuracy. At the same time, when detecting the tightness by torque, inserting the insertion rod into the vertical groove 4411, the long hole 61, and the insertion hole 541 can prevent the tail rod 22 from sliding. The inner raceway of the ball cage universal joint 2 is arc-shaped, and an axial force is likely to be generated when applying torque, causing the tail rod 22 to slide between the solid shaft rod 21. Reducing the sliding of the tail rod 22 can, on the one hand, avoid exerting pressure on the spring 52 during torque testing and causing fatigue of the spring 52, and on the other hand, avoid the influence of the vibration generated during the sliding of the tail rod 22 on torque detection.

[0049] In an alternative embodiment, the slide seat 32 is slidably connected within the slide rail 31. The slide rail 31 is detachably fixed to the workbench 1 by bolts. A lead screw 311 is provided in the slideway within the slide rail 31. The lead screw 311 passes through the slide seat 32, and the slide seat 32 is provided with an internal thread meshing with the lead screw 311 in the through hole corresponding to the passage of the lead screw 311. Support devices are provided at both ends of the lead screw 311, and one end of the lead screw 311 passes through the support device and is connected to a rotating wheel 312.

[0050] In an alternative embodiment, the lifting device 33 is a wire-pulling oil cylinder. A linear displacement sensor is provided inside the oil cylinder. The wire-pulling displacement sensor is connected to the piston rod of the oil cylinder by a wire. When the telescopic rod expands and contracts, it pulls the wire, and the mechanical device or electronic components inside the sensor convert the linear displacement of the wire into an electrical signal, thereby measuring the pushing distance of the piston rod. The wire-pulling oil cylinder can control the expansion and contraction distance of the telescopic rod.

[0051] In an alternative embodiment, the torque output device 34 is a servo motor, which can control the rotation speed and position of the output shaft according to the magnitude and direction of the control signal, thereby controlling the torque.

[0052] In an alternative embodiment, the telescopic direction of the lifting device 33 is perpendicular to the center line of the output shaft of the torque output device 34; the sliding direction of the slide seat 32 is parallel to the center line of the output shaft of the torque output device 34; the sliding direction of the slide seat 32 is perpendicular to the telescopic direction of the lifting device 33.

[0053] In an alternative embodiment, the total span angle at both ends of the sliding groove 441 in the circumferential direction of the outer surface of the hollow cylinder 44 is less than or equal to 120 degrees.

[0054] It should be noted that the threaded sleeve 54 rotates in the socket 53 without relative sliding. That is, one end of the threaded sleeve 54 in the socket 53 is fixed for rotation through a card slot. When the tail rod 22 pulls the threaded sleeve 54, there is no relative sliding between the threaded sleeve 54 and the socket 53.

[0055] It should be noted that the input torque transmitted by the torque output device 34 to the solid shaft rod 21 through the fixed fixture 35 is a fixed torque or an equivalently increasing torque.

[0056] It should be noted that the rotation direction of the torque measuring instrument 42 on the support base 41 is the same as the rotation direction of the tail rod 22 when the output part 3 is lifted or lowered.

[0057] It should be noted that a static torque sensor is provided inside the torque measuring instrument 42.

[0058] It should be noted that a tension sensor is provided inside the tension measuring instrument 51. It is an instrument made of the elasticity of metal and marked with scales to measure the magnitude of the tension.

[0059] Working principle: During coaxial detection, that is, when the center lines of the solid shaft rod 21 and the tail rod 22 coincide, the output shaft of the torque output device 34 inputs a preset torque to the fixed fixture 35, and records the time of the input torque. The torque on the fixed fixture 35 is transmitted to the solid shaft rod 21. The solid shaft rod 21 is connected through the cooperation between the inner star wheel, cage, rolling balls and outer star wheel of the constant velocity joint 2, and transmits the torque to the tail rod 22. The tail rod 22 is connected to the internal spline 45 through splines, so as to transmit the torque from the tail rod 22 to the hollow cylinder 44, and then the output torque is detected by the torque measuring instrument 42, and the time of the detected torque is recorded. When the cooperation of each component in the constant velocity joint 2 in the circumferential direction is tight, the transmission speed of the torque is faster, and when the cooperation of each component in the constant velocity joint 2 in the circumferential direction is loose, the transmission of the torque will have a delay. Therefore, the tightness in the direction of the circle 5468 can be judged according to the time required for torque transmission;

[0060] Then, the torque output device 34 can be lifted upward through the lifting device 33, so as to lift the solid shaft rod 21. When the solid shaft rod 21 is lifted, its axis is always in a horizontal state. After lifting, a torque opposite to the previous one is input again, and then the tightness is judged by the same method, so that the tightness in the circumferential direction at different inclination angles can be detected;

[0061] During the upward movement of the constant velocity joint, the tail rod 22 will slide relative to the hollow cylinder 44, so as to pull the pulling detection device 5 inside the hollow cylinder 44. The pulling force is detected during the pulling process, and the pulling tightness in the axial direction of the constant velocity joint 2 can be judged.

[0062] In summary, for the ball cage assembly tightness detection device, the torque output device 34 is set to transmit the input torque value to the solid shaft rod 21, and then the torque measuring instrument 42 is used to detect the output torque value conducted from the tail rod 22 to the hollow cylinder 44, and record the duration from when the torque output device 34 starts to input torque to when the output torque value detected by the torque measuring instrument 42 is closest to the input torque value of the torque output device 34. According to the duration, the size of the gap in the rotational direction along the inner edge of the ball cage universal joint 2 is judged. At the same time, when the lifting device 33 controls the lifting of the torque output device 34, the angle between the solid shaft rod 21 and the tail rod 22 can be changed, so as to detect the tightness of the ball cage universal joint 2 at different inclination angles.

[0063] The ball cage assembly tightness detection device is provided with a pulling detection device 5. The end of the tail rod 22 is fixed by a threaded sleeve 54. When the lifting device 33 pushes the torque output device 34 and the fixed fixture 35 to lift, the solid shaft rod 21 moves upward, the tail rod 22 tilts upward and slides outward relative to the hollow cylinder 44. At this time, the tail rod 22 drives the threaded sleeve 54 to pull the spring 52, and the tensile force measuring instrument 51 detects the tensile force generated by the spring 52. When the increase in the tensile force detected by the tensile force measuring instrument 51 is synchronized with the lifting of the output part 3, it indicates that the tightness of the ball cage universal joint 2 in the axial direction is relatively tight. When there is a delay between the increase in the tensile force detected by the tensile force measuring instrument 51 and the lifting of the output part 3, it indicates that the tightness of the ball cage universal joint 2 in the axial direction is relatively loose.

[0064] In the ball cage assembly tightness detection device, a rotating ring 6 is also rotatably connected at the position of the threaded sleeve 54 inside the hollow cylinder 44. Long holes 61 are circumferentially arranged on the rotating ring 6. The inserting rod passes through the sliding groove 441 and then passes through the long holes 61 on the rotating ring 6 and is inserted into the inserting hole 541. The rotating ring 6 can not only block the sundries entering the hollow cylinder 44 from the sliding groove 441, but also improve the anti-torsion ability of the hollow cylinder 44 after grooving, avoiding deformation of the hollow cylinder 44 when transmitting torque and affecting the accuracy. At the same time, when detecting the tightness by torque, inserting the inserting rod into the vertical groove 4411, the long holes 61 and the inserting hole 541 can prevent the tail rod 22 from sliding. The inner ball track of the ball cage universal joint 2 is arc-shaped, and axial force is easily generated when torque is applied, causing the tail rod 22 to slide relative to the solid shaft rod 21. Reducing the sliding of the tail rod 22 can, on the one hand, avoid generating pressure on the spring 52 during torque testing and causing fatigue of the spring 52, and on the other hand, avoid the influence of the vibration generated during the sliding process of the tail rod 22 on torque detection.

[0065] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0066] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for detecting tightness of a ball cage assembly, comprising a workbench (1), wherein the workbench (1) is provided with two clamps for connecting a real shaft rod (21) and a tail rod (22) on a ball cage universal joint (2), wherein: The fixture on one side of the real shaft rod (21) is a fixed fixture (35) provided on the output portion (3), and the fixture on one side of the tail rod (22) is an internal spline (45) provided on the detection portion (4); The output part (3) comprises a slide seat (32) and a lifting device (33) arranged on the slide seat (32), the telescopic rod of the lifting device (33) is connected to the torque output device (34), and the fixing fixture (35) is fixedly connected to the output shaft of the torque output device (34); The detection part (4) comprises a support base (41) fixed on the workbench (1), the support base (41) is rotatably connected to a torque measuring instrument (42), the torque detecting end of the torque measuring instrument (42) away from the support base (41) is connected to one side of a rotating base (43), the other side of the rotating base (43) is provided with a hollow cylinder (44), the internal spline (45) is provided at the end of the hollow cylinder (44), and the internal spline (45) is provided with an internal spline groove that meshes with the external spline on the tail rod (22); A pull-out detection device (5) is provided on one side of the rotating seat (43) inside the hollow cylinder (44), and the pull-out detection device (5) is used to detect the pull-out tightness of the ball cage universal joint (2) when the output part (3) is lifted; The pulling detection device (5) comprises a tension measuring instrument (51) fixed on a rotating seat (43); a side of the tension measuring instrument (51) away from the rotating seat (43) is fixedly connected to a sleeve seat (53) via a spring (52); a side of the sleeve seat (53) away from the tension measuring instrument (51) is rotatably connected to a threaded sleeve (54); an internal thread is provided in the threaded sleeve (54) that meshes with an external thread at the end of the tail rod (22); The outer circumference of the threaded sleeve (54) is provided with a plurality of insertion holes (541), and the hollow cylinder (44) is provided with a sliding groove (441) at a position corresponding to the threaded sleeve (54). The threaded sleeve (54) is screwed onto the end of the tail rod (22) after the insertion rod is inserted into the sliding groove (441) and the insertion hole (541).

2. A ball cage assembly tightness detection device according to claim 1, characterized in that: The sliding groove (441) is composed of a plurality of vertical grooves (4411) and at least one transverse groove (4412); the sliding direction of the vertical grooves (4411) is perpendicular to the sliding direction of the tail rod (22); the sliding direction of the transverse groove (4412) is parallel to the sliding direction of the tail rod (22); and the transverse groove (4412) is connected between two adjacent vertical grooves (4411).

3. A ball cage assembly tightness detection device according to claim 2, characterized in that: A rotating ring (6) is rotatably connected to the threaded sleeve (54) in the hollow cylinder (44). The rotating ring (6) fits on the inner wall of the hollow cylinder (44) and limits the sliding of the rotating ring (6) in the hollow cylinder (44) through a convex key or a boss. A long hole (61) is arranged on the circumference of the rotating ring (6). The length of the long hole (61) is equal to the total length of the transverse groove (4412). After the insertion rod passes through the sliding groove (441), it first passes through the long hole (61) on the rotating ring (6) and then is inserted into the insertion hole (541).

4. A ball cage assembly tightness detection device according to claim 1, characterized in that: The slide seat (32) is slidably connected in the slide rail (31), and the slide rail (31) is detachably fixed to the workbench (1) by bolts. A screw rod (311) is arranged in the slideway in the slide rail (31), and the screw rod (311) passes through the slide seat (32). The slide seat (32) is provided with an internal thread meshing with the screw rod (311) in a through hole corresponding to the screw rod (311) passing through. Support devices are arranged at both ends of the screw rod (311), and one end of the screw rod (311) passes through the support device and is connected to a rotating wheel (312).

5. A ball cage assembly tightness detection device according to claim 3, characterized in that: The lifting device (33) is a wire-pulling oil cylinder, and a wire displacement sensor is arranged inside the oil cylinder.

6. A ball cage assembly tightness detection device according to claim 3, characterized in that: The torque output device (34) is a servo motor.

7. A ball cage assembly tightness detection device according to claim 1, characterized in that: The extension and retraction direction of the lifting device (33) is perpendicular to the center line of the output shaft of the torque output device (34); The sliding direction of the slide seat (32) is parallel to the center line of the output shaft of the torque output device (34); The sliding direction of the sliding seat (32) is perpendicular to the telescopic direction of the lifting device (33).

8. A ball cage assembly tightness detection device according to claim 1, characterized in that: The total span angle of the sliding groove (441) at both ends in the circumferential direction of the outer surface of the hollow cylinder (44) is less than or equal to 120 degrees.

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