A device for measuring axial clearance of differential axle gears

Abstract

The present invention provides a device for measuring the axial clearance of differential axle gears, comprising: a slewing mechanism including a main shaft driven in rotation by a slewing drive mechanism; a locking mechanism including a split tensioning mechanism and an unlocking cylinder; when the unlocking cylinder extends downward and presses against the top of the tensioning shaft, a gap is created between the tensioning sleeve of the split tensioning mechanism and the axle gears, thereby unlocking the axle gears; when the unlocking cylinder retracts upward and disengages from the tensioning shaft, the tightened tensioning sleeve grips the inner wall of the axle gears, securing the axle gears and forming a synchronously rotating member with the main shaft; an axial clearance measuring mechanism for driving the vertical reciprocating displacement of the axle gears; and a detection mechanism including a position detection switch for detecting the upper and lower limit positions of the axle gears during the driving of the axial clearance measuring mechanism. The present invention enables dynamic measurement of the axial clearance of the axle gears, improves measurement accuracy, and has good compatibility.

Description

Technical Field

[0001] The invention relates to a device for measuring the axial clearance of a differential half-shaft gear. Background Art

[0002] The existing methods for measuring the axial clearance of differential axle gears are generally divided into two categories:

[0003] 1. Manual measurement uses a transition tool to manually move the axle gear up and down in the housing to measure the clearance. This method has many errors: a. There is a gap between the transition tool and the axle gear, resulting in a large error in the transmission of displacement; b. During manual measurement, the toggling effect is inconsistent, and the toggling force affects the toggling range, thereby increasing the measurement error; c. During the movement of the axle gear, there is a meshing gap with the planetary gear, and manual measurement cannot meet this gap, resulting in measurement error; d. The manual measurement items are the upper and lower limit positions of the axle gear, and the measured clearance value includes the overall clearance of the planetary gear, the straight axle, and the differential housing, which may cause the measured value to be inaccurate.

[0004] 2. Measurement by conventional equipment uses a measuring pressure head and fork structure. The pressure head and fork are used to squeeze the half-shaft gear to the relative position, and the result value is obtained by dynamic measurement + static measurement. During dynamic measurement, the pressure head is used to press the half-shaft gear for dynamic collection. During the process, there is movement and separation from the working condition, and the real-time value cannot be fully fed back, which has a certain impact on the measurement; during static measurement, there are few sampling points and insufficient measurement data, which increases the measurement error; in terms of overall structure, the product adaptability is low and cannot meet the current market environment of multi-variety compatibility. Summary of the Invention

[0005] The present invention aims to solve the above technical problems at least to a certain extent. To this end, the present invention provides a device for measuring the axial clearance of differential axle gears, which realizes dynamic measurement of the axial clearance of axle gears, improves measurement accuracy, and has good compatibility.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A device for measuring the axial clearance of a differential axle gear, wherein the workpiece to be measured is the axle gear assembled in the differential assembly housing, and the device comprises:

[0008] The rotary mechanism comprises a synchronous rotary member composed of a plurality of coaxially mounted shafts; in the synchronous rotary member, the main shaft is the shaft with the smallest diameter and is provided with an axially penetrating center hole;

[0009] The locking mechanism is used to fix and unlock the half-shaft gear, including a split tensioning mechanism and an unlocking cylinder; the split tensioning mechanism includes a tensioning shaft, a tensioning cone, a tensioning sleeve, and a tensioning spring coaxially arranged with the main shaft; the tensioning shaft is passed through the center hole of the main shaft, with a gap left between the radial directions, and is driven by the unlocking cylinder directly above to be displaced axially, the upper end of which is sleeved with a tensioning spring, and the bottom end is fixed with a tensioning cone with a large end facing downwards, the tensioning sleeve is matched with the tensioning cone, sleeved on the bottom end of the tensioning shaft and the outside of the tensioning cone, and the top end is fixedly connected to the bottom end of the main shaft; the tensioning shaft, the tensioning cone The integral structure consisting of the portion of the tensioning sleeve exposed at the bottom of the device can be adaptively sleeved in the inner hole of the side gear directly below; when the unlocking cylinder extends downward and presses against the top end of the tensioning shaft, a gap is left between the outer peripheral wall of the tensioning sleeve and the inner hole wall of the side gear in the radial direction, thereby unlocking the side gear; when the unlocking cylinder retracts upward and disengages from the tensioning shaft, the tensioning sleeve is tightened by the elastic force of the tensioning spring and the tensioning cone moving upward along the tensioning shaft, and the tightened tensioning sleeve hugs the inner hole wall of the side gear, forming a synchronous motion component with the side gear, thereby fixing the side gear;

[0010] The rotary drive mechanism is provided with a servo motor to provide a rotary drive force, which is transmitted through a transmission mechanism to drive the synchronous rotary member and the half-shaft gear to keep rotating during the measurement process, and is provided with a torque sensor for detecting the output torque;

[0011] The axial clearance measuring mechanism drives the synchronous rotary component, rotary drive mechanism, split tensioning mechanism and half-shaft gear to move vertically back and forth as a whole through the vertical drive cylinder. It is also equipped with a tension and pressure sensor and a precision pressure regulating valve, which are used to detect and adjust the loading force of the vertical drive cylinder respectively.

[0012] The detection mechanism includes a position detection switch for detecting the upper limit position and the lower limit position of the half-shaft gear during the driving process of the axial clearance measuring mechanism.

[0013] The structural characteristics of the present invention are also:

[0014] The rotary drive mechanism includes a servo motor, a reducer, a torque sensor, and a transmission mechanism;

[0015] The motor shaft of the servo motor is directly connected to the input shaft of the reducer, and the output shaft of the reducer is used as the power shaft. The transmission mechanism is a synchronous belt transmission mechanism. The two ends of the torque sensor are coaxially connected to the power shaft and the driving pulley shaft of the synchronous belt transmission mechanism through a coupling, and the driven pulley of the synchronous belt transmission mechanism is coaxially fixedly connected to the synchronous rotating component.

[0016] In the rotary mechanism:

[0017] The synchronous rotating component includes a main shaft, a rotating shaft, and a reference shaft in order from small to large diameter. The upper end of the main shaft is fixedly fitted with the rotating shaft, and the lower end is fixedly fitted with the reference shaft. The rotating shaft is coaxially fixedly assembled with the output end of the transmission mechanism, and the reference shaft is installed in the main seat.

[0018] The upper end of the main shaft is fixedly connected to the spring limit stop through a spring guide sleeve and is coaxial with each other. The tensioning spring sleeved on the upper end of the tensioning shaft is adaptively accommodated between the spring guide sleeve and the tensioning shaft. The top end is fixedly connected to the spring seat movably sleeved on the top of the tensioning shaft. The spring guide sleeve provides guidance for axial deformation. The spring guide sleeve and the spring limit stop are arranged to form a space for the spring seat to move back and forth axially along the tensioning shaft, and serve as the upper limit and lower limit of the spring seat respectively; the top end of the spring guide sleeve and the spring limit stop are fastened by an adjusting bolt, and the vertical spacing between them is adjustable by the adjusting bolt.

[0019] In the locking mechanism:

[0020] The unlocking cylinder is inverted and hoisted just above the tensioning shaft, and in the retracted state, moves vertically back and forth independently of the axial clearance measuring mechanism;

[0021] In the split tensioning mechanism, the tensioning cone is fixed to the bottom end of the tensioning shaft by a fastening screw, and the inner hole wall of the contact portion between the tensioning sleeve and the tensioning cone is adapted to the outer dimensions of the outer peripheral wall of the tensioning cone.

[0022] The axial clearance measuring mechanism further comprises a guide bearing, which cooperates with the reference shaft and is used for guiding the vertical reciprocating displacement motion.

[0023] The axial clearance measuring mechanism further comprises at least one pair of limit assemblies equidistantly distributed along the circumferential direction, wherein the limit assemblies comprise a limit shaft, a limit spring, and a limit block;

[0024] The limit block is externally and fixedly mounted on the reference shaft. The limit shaft is vertically displaced synchronously with the drive of the vertical drive cylinder. The shaft body passes through the limit block, and a pair of limit baffles are provided on the shaft body, above and below the limit block. The upper and lower ends of the limit block are connected to the pair of limit baffles by a pair of limit springs sleeved on the limit shaft. The vertical displacement of the limit shaft is limited by the limit block, and the limit shaft is reset by relying on the limit spring.

[0025] The detection mechanism includes:

[0026] The upper limit detection switch has a detection end that is directly opposite to the upper limit baffle that moves vertically upward with the limit shaft to the upper limit position, thereby detecting whether the half-shaft gear has reached the upper limit position;

[0027] The lower limit detection switch has a detection end that is directly opposite to the lower limit baffle that moves vertically downward with the limit shaft to the lower limit, thereby detecting whether the half-shaft gear has reached the lower limit.

[0028] The detection mechanism also includes:

[0029] The measuring sensor and the measuring block are externally mounted and fastened to the reference shaft and are used to transmit the displacement of the reference shaft. The measuring sensor is located directly above the measuring block, with the detection end facing the measuring block and is used to measure the relative motion clearance of the half-shaft gears during the driving process of the axial clearance measuring mechanism.

[0030] The dead stop latch assembly includes a reaction force mounting frame with a reaction force roller, a retractable dead stop latch driven by a latch cylinder, a latch home position detection switch, and a latch working position detection switch;

[0031] The reaction force mounting frame is fixedly connected to the reference shaft, and the reaction force roller is rotatably mounted on the cantilevered end. The dead stop latch can be driven by a latch cylinder, or extended to the working position and blocked at the lower end of the reaction force roller, and detected in position by the latch working position detection switch, or retracted to the original position and disengaged from the reaction force roller, and detected in position by the latch original position detection switch.

[0032] Compared with the existing technology, the beneficial effects of the present invention are embodied in:

[0033] The present invention is applied to the automatic measurement of differentials in transmission assembly production lines. Through dynamic testing, the axial motion clearance of the half-shaft gears in the differential assembly is measured to determine the qualified status of the differential assembly, screen out unqualified products, and ensure product quality. By optimizing the measuring tooling, the measurement accuracy is improved. The advantages of the present invention include:

[0034] 1. The split tensioning mechanism of the locking mechanism is used to connect the half-shaft gears, and the tensioning force is provided by the tensioning spring. Compared with the existing spline plus fork connection method, this improves the compatibility and interchangeability of the device with different types, optimizes positioning accuracy, and improves measurement accuracy. At the same time, the unlocking cylinder of the locking mechanism is used to fix / unlock the workpiece to be measured, providing unlocking force and facilitating stable connection of the workpiece.

[0035] 2. The vertical drive cylinder of the axial clearance measurement mechanism drives the side gears to perform relative vertical movement within the differential assembly housing. A split tensioning mechanism assists in this process, using a tensioning spring to transfer the rigid force of the vertical drive cylinder to the side gears. Loading force is fed back through a pull-and-pressure sensor, which is then adjusted using a precision pressure regulating valve. Finally, data is collected through a displacement sensor. The feedback and coordination between the vertical drive cylinder, precision pressure regulating valve, and pull-and-pressure sensor improves measurement accuracy and facilitates coordinated force feedback.

[0036] 3. Under the action of the rotary drive mechanism, compared with the existing static measurement method, the coordinated cooperation of various components can ensure that the measurement state is dynamic, and the previous static single-point value is optimized to dynamic full-circle sampling, which increases the sampling points; and the rotary drive mechanism uses a servo motor to drive the half-shaft gear to rotate. Compared with the previous stepper motor, it can better control related measurement parameters such as speed, time, and number of circles, obtain a relatively stable dynamic environment, ensure that the measurement process is periodic, and use periodic sampling data to avoid the randomness of sampling from having a large impact on the measurement results, thereby improving the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0038] Figure 2 It is a right side structural schematic diagram of the present invention;

[0039] Figure 3 is based on Figure 2 AA-direction cross-sectional structural diagram;

[0040] Figure 4 It is a left-side structural schematic diagram of the present invention;

[0041] Figure 5 It is a three-dimensional axonometric diagram of the present invention;

[0042] Figure 6 It is a three-dimensional axonometric schematic diagram of another viewing angle of the present invention;

[0043] Figure 7 It is a structural diagram of the dead stop latch and the latch cylinder in the dead stop latch assembly.

[0044] In the figure, 1 is the main shaft; 2 is the rotating shaft; 3 is the reference shaft; 4 is the bearing; 5 is the bearing cover; 6 is the locking nut; 7 is the unlocking cylinder; 8 is the unlocking cylinder mounting plate; 9 is the column; 10 is the tensioning shaft; 11 is the tensioning cone; 12 is the tensioning sleeve; 13 is the tensioning spring; 14 is the spring guide sleeve; 15 is the spring limit stop; 16 is the spring seat; 17 is the adjusting bolt; 18 is the servo motor; 19 is the reducer; 20 is the torque sensor; 21 is the coupling; 22 is the driving pulley; 23 is the driven pulley; 24 is the origin position detection switch; 25 is the reducer mounting plate; 26 is the vertical drive cylinder ; 27 pull pressure sensor; 28 pull pressure sensor support plate; 29 limit shaft; 30 limit block; 31 limit baffle; 32 limit spring; 33 upper limit position detection switch; 34 lower limit position detection switch; 35 measuring sensor; 36 measuring block; 37 reaction force mounting frame; 38 reaction force roller; 39 latch cylinder; 40 dead stop latch; 41 latch working position detection switch; 42 latch in-situ detection switch; 43 transition bracket; 44 mounting seat; 45 power pulley; 46 upper measuring seat; 47 guide bearing; 48 main seat. DETAILED DESCRIPTION

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with 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. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0046] The workpiece to be measured is the half-shaft gear assembled in the differential assembly housing. Please refer to Figures 1 to 7 The device for measuring the axial clearance of axle gears of a differential in this embodiment includes:

[0047] The rotary mechanism includes a synchronous rotary member composed of a plurality of coaxially mounted shafts; in the synchronous rotary member, the main shaft 1 is the shaft with the smallest diameter and is provided with an axially penetrating center hole;

[0048] The locking mechanism is used to fix and unlock the half-shaft gear, including a split tensioning mechanism and an unlocking cylinder 7; the split tensioning mechanism includes a tensioning shaft 10, a tensioning cone 11, a tensioning sleeve 12, and a tensioning spring 13 coaxially arranged with the main shaft 1; the tensioning shaft 10 is passed through the center hole of the main shaft 1, with a gap between the radial directions, and is driven by the unlocking cylinder 7 directly above to be displaced in the axial direction, the upper end of which is sleeved with a tensioning spring 13, and the bottom end is fixed with a tensioning cone 11 with the large end facing downward, the tensioning sleeve 12 is matched with the tensioning cone 11, sleeved on the bottom end of the tensioning shaft 10 and the outside of the tensioning cone 11, and the top end is fixedly connected to the bottom end of the main shaft 1; the tensioning shaft 10, The portion of the tensioning cone 11 and the tensioning sleeve 12 exposed at the bottom of the device is integrally formed and fits snugly within the inner bore of the side gear directly below. When the unlocking cylinder 7 extends downward and presses against the top of the tensioning shaft 10, a radial gap is created between the outer circumferential wall of the tensioning sleeve 12 and the inner bore wall of the side gear, thereby unlocking the side gear. When the unlocking cylinder 7 retracts upward and disengages from the tensioning shaft 10, the tensioning cone 11, which moves upward along the tensioning shaft 10, tightens the tensioning sleeve 12 due to the elastic force of the tensioning spring 13. The tightened tensioning sleeve 12 then grips the inner bore wall of the side gear, forming a synchronously moving component with the side gear, thereby securing the side gear.

[0049] The rotary drive mechanism is provided with a rotary drive force by a servo motor 18, which is transmitted through a transmission mechanism to drive the synchronous rotary member and the half-shaft gear to keep rotating during the measurement process, and is provided with a torque sensor 20 for detecting the output torque;

[0050] The axial clearance measuring mechanism drives the synchronous rotary member, rotary drive mechanism, split tensioning mechanism and half-shaft gear to move vertically back and forth as a whole through the vertical drive cylinder 26 fixed to the unlocking cylinder mounting plate 8. It is also equipped with a tension and pressure sensor 27 and a precision pressure regulating valve, which are used to detect and adjust the loading force of the vertical drive cylinder 26 respectively.

[0051] The detection mechanism includes a position detection switch for detecting the upper limit position and the lower limit position of the half-shaft gear during the driving process of the axial clearance measuring mechanism.

[0052] The structural setting of the device also includes:

[0053] The rotary drive mechanism includes a servo motor 18, a reducer 19, a torque sensor 20, and a transmission mechanism;

[0054] The motor shaft of the servo motor 18 is directly connected to the input shaft of the reducer 19 fixed on the reducer mounting plate 25, and the output shaft of the reducer 19 is used as the power shaft. The transmission mechanism is a synchronous belt transmission mechanism. The two ends of the torque sensor 20 are coaxially connected to the power shaft and the driving pulley 22 of the synchronous belt transmission mechanism through a coupling 21, and the driven pulley 23 of the synchronous belt transmission mechanism is coaxially fixed with the synchronous rotating component.

[0055] In the rotary mechanism:

[0056] The synchronous rotating components include a main shaft 1, a rotating shaft 2, and a reference shaft 3 in order from small to large diameter. The upper end of the main shaft 1 is fixedly mounted on the rotating shaft 2 and is connected to the rotating shaft 2 by a key. The lower end is fixedly mounted on the reference shaft 3. The rotating shaft 2 is coaxially fixedly assembled with the output end of the transmission mechanism. The reference shaft 3 is installed in the main seat 48 and is locked to the main shaft 1 through a bearing 4, a bearing cover plate 5 and a locking nut 6.

[0057] The upper end of the main shaft 1 is fixedly connected to the spring limit stop 15 through a spring guide sleeve 14 and is coaxial with each other. The tensioning spring 13 sleeved on the upper end of the tensioning shaft 10 is adaptively accommodated between the spring guide sleeve 14 and the tensioning shaft 10, and the top end is fixedly connected to the spring seat 16 movably sleeved on the top of the tensioning shaft 10. The spring guide sleeve 14 provides guidance for axial deformation. The spring guide sleeve 14 and the spring limit stop 15 are surrounded to form a space for the spring seat 16 to move back and forth axially along the tensioning shaft 10, and serve as the upper and lower limits of the spring seat 16 respectively; the top end of the spring guide sleeve 14 and the spring limit stop 15 are fastened by an adjusting bolt 17, and the vertical spacing between them is adjustable by the adjusting bolt 17, serving as a spring tensioning force adjustment mechanism for the tensioning spring 13 to avoid damage to the tensioning sleeve 12 due to empty expansion.

[0058] In the locking mechanism:

[0059] The unlocking cylinder 7 is inverted and hoisted just above the tensioning shaft 10, connected to the column 9 through the unlocking cylinder mounting plate 8, and is located just above the main shaft 1. In the retracted state, it moves vertically back and forth independently of the axial clearance measuring mechanism.

[0060] In the split tensioning mechanism, the tensioning cone 11 is fixed to the bottom end of the tensioning shaft 10 by a fastening screw, and the inner hole wall of the contact portion between the tensioning sleeve 12 and the tensioning cone 11 is adapted to the outer dimensions of the outer peripheral wall of the tensioning cone 11.

[0061] The axial clearance measurement mechanism also includes a guide bearing 474, which cooperates with the reference shaft 3 to guide vertical reciprocating motion. Specifically, the two ends of the pull-pressure sensor 27 are connected to the vertical drive cylinder 26 and the pull-pressure sensor support plate 28, respectively. The pull-pressure sensor support plate 28 is engaged with the limit block 30 via the limit shaft 29, and the linear bearing 4 provides motion guidance.

[0062] The axial clearance measuring mechanism further includes at least one pair of limit assemblies equidistantly distributed along the circumferential direction, the limit assemblies including a limit shaft 29, a limit spring 32, and a limit block 30;

[0063] The limit block 30 is externally and fixedly installed on the reference shaft 3. The limit shaft 29 is vertically displaced synchronously with the drive of the vertical drive cylinder 26. The shaft body passes through the limit block 30, and a pair of limit baffles 31 are provided on the shaft body, above and below the limit block 30. The upper and lower ends of the limit block 30 are connected to the pair of limit baffles 31 through a pair of limit springs 32 sleeved on the limit shaft 29. The vertical displacement of the limit shaft 29 is limited by the limit block 30, and the limit shaft 29 is reset by relying on the limit spring 32.

[0064] Testing agencies include:

[0065] The upper limit detection switch 33 has a detection end facing the upper limit baffle 31 that moves vertically upward to the upper limit position along with the limit shaft 29, thereby detecting whether the half-shaft gear has reached the upper limit position;

[0066] The lower limit detection switch 34 has a detection end facing the lower limit baffle 31 that moves vertically downward to the lower limit position along with the limit shaft 29, thereby detecting whether the half-shaft gear reaches the lower limit position.

[0067] Testing agencies also include:

[0068] The measuring sensor 35 and the measuring block 36, the measuring block 36 is externally located and fastened to the reference shaft 3, and is used to transmit the displacement of the reference shaft 3. The measuring sensor 35 is located directly above the measuring block 36, and the detection end is facing the measuring block 36, and is used to measure the relative motion clearance of the half-shaft gears during the driving process of the axial clearance measuring mechanism.

[0069] In addition, the servo motor 18 can be equipped with an origin position detection switch 24 for servo origin detection. The position detection switches and measurement sensors 35 are used to feedback the working status of the vertical drive cylinder 26 to form a vertical motion closed-loop monitoring.

[0070] The device for measuring the axial clearance of axle gears of a differential also includes a dead gear latch 40 assembly, which includes a reaction force mounting frame 37 with a reaction force roller 38, a retractable dead gear latch 40 driven by a latch cylinder 39, a latch home position detection switch 42, and a latch working position detection switch 41;

[0071] The reaction force mounting frame 37 is fixedly connected to the reference shaft 3, and the reaction force roller 38 is rotatably mounted on the end that protrudes outward. The dead stop latch 40 and the latch cylinder 39 are fixedly mounted on the main seat 48. They can be driven by the latch cylinder 39, or extended to the working position and supported on the lower end of the reaction force roller 38. At this time, the latch working position detection switch 41 detects the position, which is used to overcome the unlocking cylinder 7 and limit the reference shaft 3 to the original position to avoid the adverse effect of the travel dead limit on the measurement result; or retracted to the original position and disengaged from the reaction force roller 38. At this time, the latch original position detection switch 42 detects the position. In addition, a transition bracket 43 with a mounting seat 44 is also provided on the main seat 48. The mounting seat 44 forms a through slot, and the dead stop latch 40 extends and retracts along the slot. The transition bracket 43 is also provided with a power pulley 45 at the lower position of the slot. The outer circumference of the pulley is in rolling contact with the bottom end of the dead stop latch 40 passing through the latch, which is used to assist the dead stop latch 40 when it extends and retracts.

[0072] Working principle:

[0073] First, this device uses a servo motor 18 as a power source to ensure the stability of the dynamic measurement environment; second, it adopts a split tensioning mechanism to tighten the workpiece, uses the spring force of the tensioning spring 13 to provide the tensioning force for the tensioning sleeve 12 to clamp the half-shaft gear, and uses the vertical drive cylinder 26 to drive the half-shaft gear to move vertically, thereby realizing the relative movement of the half-shaft gear in the differential assembly housing; third, various detection elements such as the tension and pressure sensor 27 are used in conjunction to monitor the loading force on the half-shaft gear, etc., thereby realizing parameterized management of the measurement environment.

[0074] Based on the above, this device has the following advantages: 1. The use of dynamic measurement can ensure that sufficient data can be obtained during data collection to analyze the equipment status and confirm the measurement results; 2. The use of an expansion sleeve structure forms the half-shaft gear and the measuring device as a whole, transmits data in real time, and avoids relative movement and measurement errors; 3. Structurally, a locking mechanism with a quick-change structure is adopted, and a universal split-type tightening mechanism is used to enable the equipment to adapt to multiple models of products; 4. The design is equipped with a tension and pressure sensor 27, a torque sensor 20, etc., to further realize multi-functional measurement, and at the same time, the use of various sensors to display the equipment measurement parameters helps to improve the reliability of the equipment.

[0075] The working process can refer to the following steps:

[0076] 1. After the differential is fixed, under the premise of keeping the synchronous rotating member and the workpiece coaxial, the unlocking cylinder 7 extends downward to press the workpiece. At this time, the deadlock latch 40 is in the working position;

[0077] 2. The unlocking cylinder 7 retracts upward, and the tensioning shaft 10 drives the tensioning cone 11 upward under the elastic force of the tensioning spring 13, causing the tensioning sleeve 12 to deform, tighten and hold the inner wall of the axle shaft gear, and fix it relative to the axle shaft gear;

[0078] 3. The latch cylinder 39 drives the dead stop latch 40 to retract to its original position, releasing the dead stop limit;

[0079] 4. The servo motor 18 drives the gear reducer 19 to reduce the speed, and then transmits the power through the transmission mechanism to drive the synchronous rotating component and the half-shaft gear to rotate;

[0080] 5. The vertical drive cylinder 26 retracts to its original position, driving the axle gear, the reference shaft 3 and the limit block 30 and the measuring block 36 thereon to move to the upper limit position. The displacement data is collected through the upper limit detection switch 33 and the measuring sensor 35.

[0081] 6. The vertical drive cylinder 26 extends to its full position, driving the axle gear, the reference shaft 3 and the limit block 30 and the measuring block 36 thereon to move to the lower limit position. The displacement data is collected through the lower limit position detection switch 34 and the measuring sensor 35.

[0082] 7. The servo motor 18 stops;

[0083] 8. The vertical drive cylinder 26 retracts to its original position;

[0084] 9. The latch cylinder 39 drives the deadlock latch 40 to extend to the working position;

[0085] 10. The unlocking cylinder 7 extends downward, unlocking the tensioning sleeve 12 and disengaging it from the axle gear;

[0086] 11. Analyze the data collected above.

[0087] While 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 invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A device for measuring the axial clearance of differential axle gears, characterized in that: The workpiece to be measured is a half-shaft gear assembled in the differential assembly housing. The device includes: The rotary mechanism comprises a synchronous rotary component composed of a plurality of coaxially sleeved shafts; in the synchronous rotary component, the main shaft is the shaft with the smallest diameter and is provided with an axially penetrating center hole; in the rotary mechanism: the synchronous rotary component comprises a main shaft, a rotating shaft, and a reference shaft in order from small to large diameter, the upper end of the main shaft is fixedly sleeved with the rotating shaft, and the lower end is fixedly sleeved with the reference shaft, the rotating shaft is coaxially fixedly assembled with the output end of the transmission mechanism, and the reference shaft is installed in the main seat; the upper end of the main shaft is fixedly connected to the spring limit stop through a spring guide sleeve and is mutually fixed. The tensioning spring is coaxially mounted on the upper end of the tensioning shaft and is adaptively accommodated between the spring guide sleeve and the tensioning shaft. The top end of the tensioning spring is fixedly connected to a spring seat movably mounted on the top of the tensioning shaft. The spring guide sleeve provides a guide for axial deformation. The spring guide sleeve and the spring limit stop are arranged to form a space for the spring seat to move back and forth along the axial direction of the tensioning shaft, and serve as the upper and lower limits of the spring seat respectively. The top end of the spring guide sleeve and the spring limit stop are fastened by an adjusting bolt, and the vertical spacing between them is adjustable by the adjusting bolt. The locking mechanism is used to fix and unlock the half-shaft gear, including a split tensioning mechanism and an unlocking cylinder; the split tensioning mechanism includes a tensioning shaft, a tensioning cone, a tensioning sleeve, and a tensioning spring coaxially arranged with the main shaft; the tensioning shaft is passed through the center hole of the main shaft, with a gap left between the radial directions; the tensioning shaft is driven by the unlocking cylinder just above to be displaceable in the axial direction, and the upper end is sleeved with a tensioning spring, and the bottom end is fixed with a tensioning cone with a large end facing downwards; the tensioning sleeve is matched with the tensioning cone, and is sleeved on the bottom end of the tensioning shaft and the outside of the tensioning cone, and the top end of the tensioning sleeve is fixedly connected to the bottom end of the main shaft; The integral structure consisting of the tightening shaft, the tensioning cone, and the portion of the tensioning sleeve exposed below the device can be adaptively sleeved in the inner hole of the side gear directly below; when the unlocking cylinder extends downward and presses against the top end of the tensioning shaft, a radial gap is left between the outer peripheral wall of the tensioning sleeve and the inner hole wall of the side gear, thereby unlocking the side gear; when the unlocking cylinder retracts upward and disengages from the tensioning shaft, the tensioning sleeve is tightened by the elastic force of the tensioning spring and the tensioning cone moving upward along the tensioning shaft, and the tightened tensioning sleeve embraces the inner hole wall of the side gear, forming a synchronous motion component with the side gear, thereby fixing the side gear; The rotary drive mechanism is provided with a servo motor to provide a rotary drive force, which is transmitted through a transmission mechanism to drive the synchronous rotary member and the half-shaft gear to keep rotating during the measurement process, and is provided with a torque sensor for detecting the output torque; The axial clearance measuring mechanism drives the synchronous rotary component, rotary drive mechanism, split tensioning mechanism and half-shaft gear to move vertically back and forth as a whole through the vertical drive cylinder. It is also equipped with a tension and pressure sensor and a precision pressure regulating valve, which are used to detect and adjust the loading force of the vertical drive cylinder respectively. A detection mechanism, including a position detection switch for detecting an upper limit position and a lower limit position of the side gear during the driving process of the axial clearance measuring mechanism; It also includes a dead stop latch assembly, which includes a reaction force mounting frame with a reaction force roller, a retractable dead stop latch driven by a latch cylinder, a latch original position detection switch and a latch working position detection switch; the reaction force mounting frame is fixedly connected to the reference shaft, and the reaction force roller is rotatably mounted on the end cantilevered outward, and the dead stop latch can be driven by the latch cylinder. When the dead stop latch is extended to the working position and is blocked by the lower end of the reaction force roller, it is detected in position by the latch working position detection switch. When the dead stop latch is retracted to its original position and disengaged from the reaction force roller, it is detected in position by the latch original position detection switch.

2. The device for measuring the axial clearance of differential side gears according to claim 1, characterized in that: The rotary drive mechanism includes a servo motor, a reducer, a torque sensor, and a transmission mechanism; The motor shaft of the servo motor is directly connected to the input shaft of the reducer, and the output shaft of the reducer is used as the power shaft. The transmission mechanism is a synchronous belt transmission mechanism. The two ends of the torque sensor are coaxially connected to the power shaft and the driving pulley shaft of the synchronous belt transmission mechanism through a coupling, and the driven pulley of the synchronous belt transmission mechanism is coaxially fixedly connected to the synchronous rotating component.

3. The device for measuring the axial clearance of axle gears of a differential according to claim 1, characterized in that: In the locking mechanism: The unlocking cylinder is inverted and hoisted just above the tensioning shaft. When the unlocking cylinder is in a retracted state, it moves vertically back and forth independently of the axial clearance measuring mechanism. In the split tensioning mechanism, the tensioning cone is fixed to the bottom end of the tensioning shaft by a fastening screw, and the inner hole wall of the contact portion between the tensioning sleeve and the tensioning cone is adapted to the outer dimensions of the outer peripheral wall of the tensioning cone.

4. The device for measuring axial clearance of differential side gears according to claim 1, characterized in that: The axial clearance measuring mechanism further comprises a guide bearing, which cooperates with the reference shaft and is used for guiding the vertical reciprocating displacement motion.

5. The device for measuring axial clearance of differential side gears according to claim 1, characterized in that: The axial clearance measuring mechanism further comprises at least one pair of limit assemblies equidistantly distributed along the circumferential direction, wherein the limit assemblies comprise a limit shaft, a limit spring, and a limit block; The limit block is externally and fixedly mounted on the reference shaft, and the limit shaft is vertically displaced synchronously with the drive of the vertical drive cylinder. The shaft body of the limit shaft passes through the limit block, and a pair of limit baffles are provided on the shaft body, above and below the limit block. The upper and lower ends of the limit block are connected to the pair of limit baffles by a pair of limit springs sleeved on the limit shaft. The vertical displacement of the limit shaft is limited by the limit block, and the limit shaft is reset by relying on the limit spring.

6. The device for measuring the axial clearance of differential side gears according to claim 5, characterized in that: The detection mechanism includes: The upper limit detection switch has a detection end that is directly opposite to the upper limit baffle that moves vertically upward with the limit shaft to the upper limit position, thereby detecting whether the half-shaft gear has reached the upper limit position; The lower limit detection switch has a detection end that is directly opposite to the lower limit baffle that moves vertically downward to the lower limit along with the limit shaft, thereby detecting whether the half-shaft gear has reached the lower limit.

7. The device for measuring the axial clearance of axle gears of a differential according to claim 1, characterized in that: The detection mechanism also includes: The measuring sensor and the measuring block are externally mounted and fastened to the reference shaft and are used to transmit the displacement of the reference shaft. The measuring sensor is located directly above the measuring block, with the detection end facing the measuring block and is used to measure the relative motion clearance of the half-shaft gears during the driving process of the axial clearance measuring mechanism.

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