Ball cage assembly tightness detection device

Abstract

The invention relates to the technical field of ball cage universal joint production qualification detection, and discloses a ball cage assembly tightness degree detection device which comprises a workbench, the workbench is provided with two clamps used for being connected with a solid shaft rod and a tail rod on a ball cage universal joint respectively, the clamp on one side of the solid shaft rod is a fixed clamp arranged on an output part, and the clamp on the other side of the solid shaft rod is a movable clamp arranged on the output part. The clamp on one side of the tail rod is an internal spline arranged on the detection part, the output part comprises a sliding seat and a lifting device arranged on the sliding seat, a telescopic rod of the lifting device is connected with a torque output device, the fixed clamp is fixedly connected to an output shaft of the torque output device, and the detection part comprises a supporting seat fixedly connected to the workbench. The supporting seat is rotatably connected with the torque measuring instrument, the torque detecting end, away from the supporting seat, of the torque measuring instrument is connected with one side of the rotating seat, the other side of the rotating seat is provided with the hollow cylinder, the internal spline is arranged at the end of the hollow cylinder, and the tightness of the spherical cage universal joint in the inner circumferential direction under different inclination conditions can be accurately detected.

Description

Technical Field

[0001] The invention relates to the technical field of qualified production detection of ball cage universal joints, in particular to a ball cage assembly tightness detection device. Background Art

[0002] As a key component in the automobile transmission system, the main function of the ball joint is to achieve stable and efficient power transmission between different shafts and allow the transmission shaft to flexibly change within a certain angle range. During the operation of the car, the ball joint needs to withstand the strong torque from the engine and the impact and vibration caused by various complex road conditions.

[0003] The ball cage universal joint includes an outer star wheel, an inner star wheel, a retaining frame and a rolling ball. A tail rod is arranged on the outer star wheel, an inner spline is arranged on the inner side of the inner star wheel, an outer spline is arranged at the end of the real shaft rod to be slidingly connected with the inner star wheel, and an annular groove mounting clamp is also arranged at the end of the real shaft rod, so that the real shaft rod is fixed in the inner star wheel through the clamp after the real shaft rod passes through the inner star wheel.

[0004] The tightness of the ball joint directly affects its transmission efficiency, working noise and service life. In the automobile manufacturing process, accurate detection of the tightness of the ball joint is an important part of ensuring product quality. Traditional detection methods often rely on manual experience, manually turning the ball joint and judging its tightness by feel. This detection method has low accuracy and reliability.

[0005] Patent publication number CN204694389U, a ball cage assembly tightness detection device, and CN205764848U, an outer ball cage assembly and tightness detection integrated machine, both disclose methods for detecting the tightness of a ball cage universal joint, but both have the following defects: lack of tightness detection in the circumferential direction of the ball cage; lack of tightness detection when the ball cage is tilted at different angles. Summary of the invention

[0006] 1. Technical issues to be resolved In view of the shortcomings of the prior art, the present invention provides a ball cage assembly tightness detection device, which has the advantage of accurately detecting the tightness in the circumferential direction of the ball cage universal joint under different tilt conditions, and solves the problems in the prior art of lack of tightness detection in the circumferential direction of the ball cage and lack of tightness detection of the ball cage when it is tilted at different angles.

[0007] (II) Technical solution To achieve the above object, the present invention provides the following technical solutions: A ball cage assembly tightness detection device, comprising a workbench, the workbench is provided with two clamps for connecting the real shaft rod and the tail rod on the ball cage universal joint respectively, the clamp on one side of the real shaft rod is a fixed clamp arranged on the output part, the clamp on one side of the tail rod is an internal spline arranged on the detection part, the output part comprises a slide seat and a lifting device arranged on the slide seat, the telescopic rod of the lifting device is connected to a torque output device, the fixed clamp is fixedly connected to the output shaft of the torque output device, the detection part comprises a support seat fixedly connected to the workbench, the support seat is rotatably connected to a torque measuring instrument, the torque measuring instrument is connected to one side of a rotating seat at a torque detection end away from the support 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 that meshes with the external spline on the tail rod; The torque output device transmits the input torque value to the real shaft rod through the fixing fixture, and the torque measuring instrument is used to detect the output torque value transmitted from the tail rod to the hollow cylinder, and the time length from the beginning of the torque input of the torque output device to the time when the output torque value detected by the torque measuring instrument is closest to the input torque value of the torque output device is recorded, and the size of the gap in the rotation direction of the ball cage universal joint is judged according to the time length. At the same time, the lifting device can change the angle between the real shaft rod and the tail rod when controlling the lifting of the torque output device, so as to detect the tightness of the ball cage universal joint at different tilt angles.

[0008] Preferably, a pull-out detection device is provided on one side of the rotating seat in the hollow cylinder, and the pull-out detection device is used to detect the pull-out tightness of the ball cage universal joint when the output part is lifted, and the pull-out detection device includes a tension measuring instrument fixed on the rotating seat, and the tension measuring instrument is connected to a sleeve seat by a spring at a side away from the rotating seat, and a threaded sleeve is rotatably connected to the side of the sleeve seat away from the tension measuring instrument, and an internal thread that meshes with the external thread at the end of the tail rod is provided in the threaded sleeve; The end of the tail rod is fixed in the threaded sleeve by a thread. When the lifting device pushes the torque output device and the fixing fixture to lift, the real shaft rod translates upward, the tail rod tilts upward and slides outward relative to the hollow tube. At this time, the tail rod drives the threaded sleeve to pull the spring, thereby detecting the tension generated by the spring through a tension measuring instrument. When the tension increase detected by the tension measuring instrument is synchronized with the lifting and lowering of the output part, it indicates that the axial tightness of the ball cage universal joint is tight. When there is a delay between the tension increase detected by the tension measuring instrument and the lifting and lowering of the output part, it indicates that the axial tightness of the ball cage universal joint is loose.

[0009] Preferably, the outer circumference of the threaded sleeve is provided with a plurality of insertion holes, and the hollow cylinder is provided with a sliding groove at a position corresponding to the threaded sleeve, and the threaded sleeve is tightened on the end of the tail rod by inserting the insertion rod into the sliding groove and the insertion hole and then rotating the threaded sleeve.

[0010] Preferably, the sliding groove consists of a plurality of vertical grooves and at least one transverse groove, the slide direction of the vertical groove is perpendicular to the sliding direction of the tail rod, the slide direction of the transverse groove is parallel to the sliding direction of the tail rod, and the transverse groove is connected between two adjacent vertical grooves.

[0011] Preferably, a rotating ring is rotatably connected at the position of the threaded sleeve in the hollow cylinder, and the rotating ring is fitted on the inner wall of the hollow cylinder and limits the sliding of the rotating ring in the hollow cylinder through a convex key or a boss. A long hole is arranged on the circumference of the rotating ring, and the length of the long hole is equal to the total length of the transverse groove. After the insertion rod passes through the sliding groove, it 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 debris from entering the hollow cylinder from the sliding groove. At the same time, the rotating ring can improve the anti-twist ability of the hollow cylinder after grooving, and avoid deformation of the hollow cylinder when transmitting torque to affect the accuracy. At the same time, when detecting the tightness through torque, inserting the insertion rod into the vertical groove, the long hole and the insertion hole can avoid the tail rod from sliding. The ball track in the ball cage universal joint is arc-shaped, and it is easy to generate axial force when torque is applied to cause sliding between the tail rod and the real shaft rod. Reducing the sliding of the tail rod can, on the one hand, avoid pressure on the spring during torque testing to cause spring fatigue, and on the other hand, avoid the influence of vibration generated during the sliding process of the tail rod on torque detection.

[0012] Preferably, the slide seat is slidably connected in a slide rail, and the slide rail is detachably fixed to the workbench by bolts. A screw rod is arranged in the slideway in the slide rail, and the screw rod passes through the slide seat. The slide seat is provided with an internal thread engaging with the screw rod in a through hole corresponding to the screw rod passing through. Support devices are arranged at both ends of the screw rod, and one end of the screw rod passes through the support device and is connected to a rotating wheel.

[0013] Preferably, the lifting device is a wire-pull cylinder, in which a linear displacement sensor is arranged. The wire-pull displacement sensor is connected to the piston rod of the cylinder via a wire. When the telescopic rod is extended or retracted, 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 push-out distance of the piston rod. The wire-pull cylinder can control the retraction distance of the telescopic rod.

[0014] Preferably, the torque output device is a servo motor, which can control the speed and position of the output shaft according to the size and direction of the control signal, thereby controlling the torque.

[0015] 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 slide is parallel to the center line of the output shaft of the torque output device; the sliding direction of the slide is perpendicular to the telescopic direction of the lifting device.

[0016] Preferably, the total span angle of the sliding groove at both ends of the outer surface of the hollow cylinder in the circumferential direction is less than or equal to 120 degrees.

[0017] (III) Beneficial effects Compared with the prior art, the present invention provides a device for detecting the tightness of a ball cage assembly, which has the following beneficial effects: 1. The ball cage is equipped with a tightness detection device, which transmits the input torque value to the real shaft rod by setting a torque output device, and then uses a torque measuring instrument to detect the output torque value transmitted from the tail rod to the hollow cylinder, and records the time from the beginning of the torque input of the torque output device to the time when the output torque value detected by the torque measuring instrument is closest to the input torque value of the torque output device, and judges the size of the gap in the rotation direction of the ball cage universal joint according to the time. At the same time, the lifting device can change the angle between the real shaft rod and the tail rod when controlling the lifting of the torque output device, so as to detect the tightness of the ball cage universal joint at different tilt angles.

[0018] 2. The ball cage is equipped with a tightness detection device and a pull-out detection device. 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 real shaft rod translates upward, and the tail rod tilts upward and slides outward relative to the hollow tube. At this time, the tail rod drives the threaded sleeve to pull the spring, and the tension measuring instrument detects the tension generated by the spring. When the tension increase detected by the tension measuring instrument is synchronized with the lifting and lowering of the output part, it indicates that the axial tightness of the ball cage universal joint is tight. When there is a delay between the tension increase detected by the tension measuring instrument and the lifting and lowering of the output part, it indicates that the axial tightness of the ball cage universal joint is loose.

[0019] 3. The ball cage is equipped with a tightness detection device. A rotating ring is rotatably connected to the position of the threaded sleeve in the hollow cylinder. Long holes are arranged on the circumference of the rotating ring. After the insertion rod passes through the sliding groove, it first passes through the long hole on the rotating ring and then is inserted into the insertion hole. The rotating ring can not only block the debris entering the hollow cylinder from the sliding groove, but also improve the anti-twist ability of the hollow cylinder after grooving, and avoid deformation of the hollow cylinder to affect the accuracy when transmitting torque. At the same time, when the tightness is detected by torque, the insertion rod is inserted into the vertical groove, the long hole and the insertion hole to avoid the tail rod from sliding. The ball track in the ball cage universal joint is arc-shaped, and it is easy to generate axial force when torque is applied to cause sliding between the tail rod and the real shaft rod. Reducing the sliding of the tail rod can avoid pressure on the spring during torque testing to cause spring fatigue on the one hand, and avoid the influence of vibration generated during the sliding process of the tail rod on torque detection on the other hand. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the output structure of the present invention.

[0022] Figure 3 It is a schematic structural diagram of the detection unit of the present invention.

[0023] Figure 4It is an exploded diagram of the detection part of the present invention.

[0024] Figure 5 It is a schematic structural diagram of the pulling detection device of the present invention.

[0025] Figure 6 It is a structural schematic diagram of the hollow cylinder of the present invention.

[0026] Figure 7 It is a schematic structural diagram of the rotating ring of the present invention.

[0027] Figure 8 It is a cross-sectional view of the present invention.

[0028] In the figure: 1. workbench; 2. ball cage universal joint; 3. output part; 4. detection part; 5. pulling detection device; 6. rotating ring; 21. solid shaft rod; 22. tail rod; 31. slide rail; 32. slide seat; 33. lifting device; 34. torque output device; 35. fixing fixture; 311. screw rod; 312. rotating wheel; 41. supporting seat; 42. torque measuring instrument; 43. rotating seat; 44. hollow cylinder; 45. internal spline; 441. sliding groove; 4411. vertical groove; 4412. horizontal groove; 51. tension measuring instrument; 52. spring; 53. sleeve; 54. threaded sleeve; 541. socket; 61. long hole. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are 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 direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0031] In addition, a fixed connection refers to a connection in which there is no relative movement after the parts or components are fixed; a transmission connection refers to a connection method in which mechanical motion or torque is transmitted to other working parts through a transmission part; a sliding connection refers to a connection method in which two objects are in contact but not fixed and can slide relative to each other; a rotating connection refers to a connection method in which two objects are in contact but not fixed and can rotate relative to each other.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] Embodiment 1: This embodiment provides a device for detecting the tightness of a ball cage assembly, which has the following technical features.

[0034] See also Figure 1-8 , a ball cage assembly tightness detection device, comprising a workbench 1, the workbench 1 is provided with two clamps for connecting the real shaft rod 21 and the tail rod 22 on the ball cage universal joint 2, the clamp on one side of the real shaft rod 21 is a fixed clamp 35 arranged on the output part 3, the clamp on one side of the tail rod 22 is an internal spline 45 arranged on the detection part 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, the fixed clamp 35 is fixedly connected to the output shaft of the torque output device 34, the detection part 4 comprises a support seat 41 fixedly connected to the workbench 1, the support seat 41 is rotatably connected to a torque measuring instrument 42, the torque measuring instrument 42 is connected to one side of a rotating seat 43 away from the support seat 41, and the other side of the rotating seat 43 is provided with a hollow cylinder 44, the internal spline 45 is arranged 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; The torque output device 34 transmits the input torque value to the real shaft rod 21 through the fixing clamp 35. The torque measuring instrument 42 is used to detect the output torque value transmitted from the tail rod 22 to the hollow cylinder 44. The time length from the start of the torque input to the torque output device 34 to the output torque value detected by the torque measuring instrument 42 being closest to the input torque value of the torque output device 34 is recorded. The size of the gap in the rotation direction inside the ball cage universal joint 2 is determined according to the time length. At the same time, the lifting device 33 can change the angle between the real shaft rod 21 and the tail rod 22 when controlling the lifting of the torque output device 34, thereby detecting the tightness of the ball cage universal joint 2 at different tilt angles.

[0035] In an optional embodiment, a pull-out detection device 5 is provided on one side of the rotating seat 43 in the hollow cylinder 44. 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 pull-out detection device 5 includes a tension measuring instrument 51 fixed on the rotating seat 43. The side of the tension measuring instrument 51 away from the rotating seat 43 is fixedly connected to the sleeve 53 through a spring 52. The side of the sleeve 53 away from the tension measuring instrument 51 is rotatably connected to a threaded sleeve 54. The threaded sleeve 54 is provided with an internal thread that meshes with the external thread at the end of the tail rod 22. The end of the tail rod 22 is fixed in the threaded sleeve 54 by a thread. When the lifting device 33 pushes the torque output device 34 and the fixing clamp 35 to lift, the real shaft rod 21 translates upward, and the tail rod 22 tilts upward and slides outward relative to the hollow tube 44. At this time, the tail rod 22 drives the threaded sleeve 54 to pull the spring 52, so that the tension generated by the spring 52 is detected by the tension measuring instrument 51. When the tension increase detected by the tension measuring instrument 51 is synchronized with the lifting and lowering of the output part 3, it indicates that the axial tightness of the ball cage universal joint 2 is tight. When there is a delay between the tension increase detected by the tension measuring instrument 51 and the lifting and lowering of the output part 3, it indicates that the axial tightness of the ball cage universal joint 2 is loose.

[0036] In an optional embodiment, a plurality of insertion holes 541 are provided on the outer circumference of the threaded sleeve 54, and a sliding groove 441 is provided on the hollow cylinder 44 at a position corresponding to the threaded sleeve 54. The threaded sleeve 54 is tightened on the end of the tail rod 22 by inserting the insertion rod into the sliding groove 441 and the insertion hole 541 and then rotating the threaded sleeve 54.

[0037] In an optional embodiment, the sliding groove 441 is composed of multiple vertical grooves 4411 and at least one transverse groove 4412, the sliding direction of the vertical groove 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.

[0038] In an optional embodiment, a rotating ring 6 is rotatably connected at the position of 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. The rotating ring 6 is used to block debris from entering the hollow cylinder 44 from the sliding groove 441. At the same time, the rotating ring 6 can improve the hollow cylinder 44. The anti-twisting ability after slotting can prevent the deformation of the hollow tube 44 when transmitting torque, which affects the accuracy. At the same time, when detecting the tightness through torque, inserting the rod into the vertical groove 4411, the long hole 61 and the socket 541 can prevent the tail rod 22 from sliding. The ball track in the ball cage universal joint 2 is arc-shaped, and it is easy to generate axial force when torque is applied to cause the tail rod 22 to slide with the real shaft rod 21. Reducing the sliding of the tail rod 22 can, on the one hand, avoid the pressure on the spring 52 during the torque test, causing the spring 52 to fatigue, and on the other hand, avoid the influence of the vibration generated during the sliding of the tail rod 22 on the torque detection.

[0039] In an optional embodiment, 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 the 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.

[0040] In an optional embodiment, the lifting device 33 is a wire-pull cylinder, in which a linear displacement sensor is arranged. The wire-pull displacement sensor is connected to the piston rod of the cylinder through a wire. When the telescopic rod is extended or retracted, 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-pull cylinder can control the retraction distance of the telescopic rod.

[0041] In an optional embodiment, the torque output device 34 is a servo motor, which can control the speed and position of the output shaft according to the size and direction of the control signal, thereby controlling the torque.

[0042] In an optional 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 32 is parallel to the center line of the output shaft of the torque output device 34; the sliding direction of the slide 32 is perpendicular to the telescopic direction of the lifting device 33.

[0043] In an optional embodiment, the total span angle of 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.

[0044] It should be noted that the threaded sleeve 54 rotates in the sleeve 53 without relative sliding, that is, one end of the threaded sleeve 54 in the sleeve 53 is fixed and rotated by a slot, and when the tail rod 22 pulls the threaded sleeve 54, there is no relative sliding between the threaded sleeve 54 and the sleeve 53.

[0045] It should be noted that the input torque transmitted by the torque output device 34 to the real shaft rod 21 through the fixing fixture 35 is a fixed torque or an equally increasing torque.

[0046] It should be noted that the rotation direction of the torque meter 42 on the support seat 41 is consistent with the rotation direction of the tail rod 22 when the output part 3 is raised or lowered.

[0047] It should be noted that a static torque sensor is provided in the torque measuring instrument 42 .

[0048] It should be noted that a tension sensor is provided in the tension measuring instrument 51, which is an instrument made of metal elasticity and marked with scales for measuring the magnitude of tension.

[0049] Working principle: During the coaxial detection, that is, when the center lines of the real shaft rod 21 and the tail rod 22 coincide, the output axial fixing fixture 35 of the torque output device 34 inputs a preset torque, and records the time of the input torque. The torque on the fixing fixture 35 is transmitted to the real shaft rod 21, and the real shaft rod 21 transmits the torque to the tail rod 22 through the matching connection between the inner star wheel, the retaining frame, the roller and the outer star wheel of the ball cage universal joint 2. The tail rod 22 is connected to the inner spline 45 through a spline, so that the torque is transmitted from the tail rod 22 to the hollow cylinder 44. Then the output torque is detected by the torque measuring instrument 42, and the time of the torque detection is recorded. When the components in the ball cage universal joint 2 are tightly matched in the circumferential direction, the torque transmission speed is faster, and when the components in the ball cage universal joint 2 are loosely matched in the circumferential direction, the torque transmission will be delayed. Therefore, the tightness in the circular 5468 direction can be judged according to the time required for torque transmission; Then, the torque output device 34 can be lifted upward by the lifting device 33, so that the real shaft rod 21 is lifted. When the real shaft rod 21 is lifted, the axis is always in a horizontal state. After lifting, the torque opposite to the last time is re-input, and then the tightness is determined by the same method, so that the tightness in the circumferential direction under different tilt angles can be detected; When the ball cage is moving upward, the tail rod 22 will slide relative to the hollow tube 44, thereby pulling the pulling detection device 5 in the hollow tube 44. The pulling force is detected during the pulling process to determine the axial pulling tightness of the ball cage universal joint 2.

[0050] To summarize, the ball cage assembly tightness detection device transmits the input torque value to the real shaft rod 21 by setting the torque output device 34, and then uses the torque measuring instrument 42 to detect the output torque value transmitted from the tail rod 22 to the hollow cylinder 44, and records the time from the start of the torque input of the torque output device 34 to the time 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 determines the size of the gap in the rotation direction of the ball cage universal joint 2 according to the time. At the same time, the lifting device 33 can change the angle between the real shaft rod 21 and the tail rod 22 when controlling the lifting of the torque output device 34, thereby detecting the tightness of the ball cage universal joint 2 at different tilt angles.

[0051] The ball cage is equipped with a tightness detection device, which is provided with a pull-out detection device 5. The end of the tail rod 22 is threadedly fixed by a threaded sleeve 54. When the lifting device 33 pushes the torque output device 34 and the fixing fixture 35 to lift, the real shaft rod 21 translates upward, and the tail rod 22 tilts upward and slides outward relative to the hollow tube 44. At this time, the tail rod 22 drives the threaded sleeve 54 to pull the spring 52, and the tension measuring instrument 51 detects the tension generated by the spring 52. When the tension increase detected by the tension measuring instrument 51 is synchronized with the lifting and lowering of the output part 3, it indicates that the axial tightness of the ball cage universal joint 2 is tight. When there is a delay between the tension increase detected by the tension measuring instrument 51 and the lifting and lowering of the output part 3, it indicates that the axial tightness of the ball cage universal joint 2 is loose.

[0052] The ball cage is equipped with a tightness detection device. A rotating ring 6 is rotatably connected to the position of the threaded sleeve 54 in the hollow cylinder 44. A long hole 61 is arranged on the circumference of the rotating ring 6. 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. The rotating ring 6 can not only block the debris entering the hollow cylinder 44 from the sliding groove 441, but also improve the anti-twist ability of the hollow cylinder 44 after slotting, and avoid the deformation of the hollow cylinder 44 when transmitting torque to affect the accuracy. At the same time, when the tightness is detected by torque, the insertion rod is inserted into the vertical groove 4411, the long hole 61 and the insertion hole 541 to prevent the tail rod 22 from sliding. The ball track in the ball cage universal joint 2 is arc-shaped, and it is easy to generate axial force when torque is applied to cause the tail rod 22 to slide with the real shaft rod 21. Reducing the sliding of the tail rod 22 can avoid the pressure on the spring 52 during the torque test, which causes the spring 52 to fatigue, and on the other hand, it can avoid the influence of the vibration generated during the sliding process of the tail rod 22 on the torque detection.

[0053] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0054] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that 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).

2. A ball cage assembly tightness detection device according to claim 1, characterized in that: 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).

3. A ball cage assembly tightness detection device according to claim 2, characterized in that: 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).

4. A ball cage assembly tightness detection device according to claim 3, 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).

5. A ball cage assembly tightness detection device according to claim 4, 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).

6. 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).

7. A ball cage assembly tightness detection device according to claim 6, characterized in that: The lifting device (33) is a wire-pulling oil cylinder, and a wire displacement sensor is arranged inside the oil cylinder.

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

9. 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).

10. A ball cage assembly tightness detection device according to claim 3, 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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