A differential gear clearance measurement system and a differential gear clearance measurement method

Abstract

The invention discloses a differential gear clearance measurement system; the system comprises a measuring platform, a measuring device, a computer, a data acquisition instrument and a voltage-stabilized power supply; the expansion sleeve of the invention is firmly connected to the half-axle gear; the system is placed vertically, and multi-angle measurement is interference-free; the fixed platform is professional and reliable; the sensor data acquisition instrument is used to collect data, and the computer processes the data, so as to solve the differences between measurement personnel, limit the errors of multiple measurements to within 3%, and greatly shorten the measurement time.

Description

Technical Field

[0001] The invention relates to the technical field of measuring and checking tools, and in particular to a differential gear clearance measuring system and a measuring method. Background Art

[0002] The differential is an important power transmission device in the vehicle transmission system. Its function is to achieve differential movement between the left and right wheels or the front and rear axles on steering or unpaved roads. The two planetary gears and two half-axle gears installed inside the differential play the role of differential transmission. The four gears make up the differential transmission system, and the side clearance between the gears is an important technical parameter in the system.

[0003] At present, the measurement and control of this parameter in the industry is not satisfactory: since it is difficult to directly measure the gear side clearance in the assembly, most manufacturers currently measure the axial runout of the half-shaft gear or the steering angle on the automated assembly production line to indirectly reflect the gear clearance. The problem is that the detection equipment is expensive and does not meet the needs of diverse small-batch production.

[0004] Currently, many drivability problems of reducers are related to clearance, such as abnormal noise caused by gear impact and abnormal noise caused by front-wheel drive steering. Rapid and accurate measurement of clearance is very important for solving the problem. The clearance of the reducer differential gear is the biggest factor affecting the clearance of the reducer assembly gears. It is necessary to quickly and accurately measure the clearance of the problematic differential planetary gears.

[0005] The current method uses a half-shaft to connect with the differential half-shaft gear through a spline, and fixes it with a pipe clamp and a vise, and a dial indicator measures the gear clearance at three positions on the tooth surface of the half-shaft gear; the current method is loosely fixed, and the success rate of completing three-point measurement at one time is less than 50%. It is difficult to place it horizontally, and it is difficult to select the measuring angle. There are differences in measurement between different angles. Different people have made multiple measurements with poor consistency, with the maximum difference of 20%; the current method has unstable connection, large measurement errors, and is time-consuming, and some products lack half-shafts and do not have the conditions for measurement. Summary of the invention

[0006] In order to solve the above problems, the present invention proposes a differential gear clearance measurement system, in which the expansion sleeve is firmly connected to the half-shaft gear; it is placed vertically, and multi-angle measurement is without interference. The use of a fixed platform is professional and reliable, and a sensor data acquisition instrument is used to collect data. The data is processed by a computer to solve the differences between measurement personnel, so that the error of multiple measurements is within 3%, and the measurement time is greatly shortened.

[0007] A differential gear clearance measurement system of the present invention comprises a measurement platform, a measurement device, a computer, a data acquisition instrument and a voltage-stabilized power supply;

[0008] The measuring platform comprises a measuring table, a first vertical guide rail, a second vertical guide rail, a displacement sensor sliding bracket, a first worm support frame, a second worm support frame, a turbine positioning plate and a worm;

[0009] The first vertical guide rail and the second vertical guide rail are respectively fixed vertically to the end surface of the measuring table;

[0010] The displacement sensor sliding bracket is slidably limited and sleeved in the middle of the first vertical guide rail;

[0011] The first worm support frame and the second worm support frame are respectively slidably limited and sleeved on the upper parts of the first vertical guide rail and the second vertical guide rail;

[0012] The two ends of the turbine positioning plate are respectively slidably sleeved on the upper ends of the first vertical guide rail and the second vertical guide rail, and the two ends of the turbine positioning plate are respectively in limited contact with the upper end surfaces of the first worm support frame and the second worm support frame, and the turbine displacement is limited by its own weight;

[0013] The worm is horizontally sleeved in the first worm support frame and the second worm support frame, and the sleeve joint between the worm and the first worm support frame and the second worm support frame can be rotatably limited, and the worm can rotate in the holes of the first worm support frame and the second worm support frame and cannot move laterally;

[0014] The measuring device includes, from top to bottom, a turbine, a torque sensor, a first nut, an upper thrust roller bearing, a support measuring block, a lower thrust roller bearing, a second nut, a displacement measuring block, a first expansion sleeve, a first boss screw, a second boss screw, a second expansion sleeve, and a third nut;

[0015] The support and measurement block also includes a first support upright rod, a second support upright rod, fourth upper and lower nuts, fifth upper and lower nuts, and a displacement sensor;

[0016] The upper end of the turbine is matched with the circular hole on the turbine positioning plate through the turbine shaft, and the hexagonal head at the lower end of the turbine is sleeved with the hexagonal hole at the upper end of the torque sensor to transmit torque. The torque sensor is used to measure the torque size, connect the data acquisition instrument, and cooperate with the computer to record and analyze the displacement data. The torque sensor is a detection of the torsional moment perception on various rotating or non-rotating mechanical parts. The torque sensor converts the physical change of torque into an accurate electrical signal; the turbine and the worm are meshed at the corresponding position;

[0017] The first boss screw is respectively sleeved with the first expansion sleeve, the displacement measuring block, the second nut, the lower thrust roller bearing, the support measuring block, the upper thrust roller bearing, and the first nut from bottom to top; the hexagonal head at the upper end of the first boss screw is sleeved with the hexagonal hole at the lower end of the torque sensor;

[0018] The first nut and the second nut sandwich the upper thrust roller bearing, the support measuring block, and the lower thrust roller bearing therebetween in sequence, and the first nut and the second nut are screwed and fixed with the first boss screw. The upper and lower thrust roller bearings can provide supporting force and ensure that the first boss screw can rotate easily relative to the support measuring block, and the first boss screw can rotate freely in the support measuring block.

[0019] The lower ends of the first support rod and the second support rod are respectively in vertical contact with the upper surface of the measuring table, the upper ends of the first support rod and the second support rod respectively penetrate the upper end surfaces of both sides of the supporting measuring block and are respectively screwed and fixed with the fourth upper and lower nuts and the fifth upper and lower nuts, and the first boss screw is suspended above the measuring table;

[0020] The first expansion sleeve is screwed and fixed with the first boss screw, the second nut and the first expansion sleeve clamp and fix the displacement measuring block between the two, and the displacement measuring block rotates synchronously with the first boss screw;

[0021] The displacement sensor is universally hinged on the displacement sensor sliding bracket, and the end of the displacement sensor is slidably contacted with the side wall of the displacement measuring block;

[0022] The lower end of the first expansion sleeve can contact and expand with the lower end of the first boss screw;

[0023] The second boss screw is arranged in a direction opposite to that of the first boss screw. A second expansion sleeve is sleeved and threaded on the second boss screw. The upper end of the second expansion sleeve can contact and expand with the upper end of the second boss screw.

[0024] The upper end of the second boss screw is adjacent to the lower end of the first boss screw, and the second boss screw is coaxial with the first boss screw. The upper end of the second expansion sleeve sleeved on the second boss screw is exposed on the upper surface of the measuring table, and the outer side wall of the upper end of the second expansion sleeve is threadedly connected with the measuring table threaded hole of the measuring table. The third nut is threadedly engaged with the outer thread of the second expansion sleeve on the lower surface of the measuring table, and the upper end face of the third nut is in contact with the lower surface of the measuring table. The main function of this structure is to provide downward pulling force to pull down the lower half-shaft gear of the measured piece to fit with the differential case.

[0025] The computer, the data acquisition instrument and the voltage-stabilized power supply are electrically connected in sequence through wires;

[0026] The torque sensor and the displacement sensor are electrically connected to the data acquisition instrument through wires respectively.

[0027] The displacement sensor sliding bracket includes a sliding fixing ring, a large screw, a sensor fixing rod, and a small screw; the sliding fixing ring is slidably sleeved on the first vertical guide rail, and is limitedly fixed to the first vertical guide rail by a large screw penetrated on the outer wall of the sliding fixing ring; a transverse through-hole is provided on the side wall of the sliding fixing ring corresponding to the side of the displacement measuring block, and the sensor fixing rod is slidably sleeved in the transverse through-hole, and the sensor fixing rod can drive the displacement sensor to move forward and backward to adjust the position, and the front end of the sensor fixing rod is universally hinged with the displacement sensor, and a small screw is screwed on the side wall of the sliding fixing ring corresponding to the side of the sensor fixing rod, and the small screw can limit and fix the sensor fixing rod.

[0028] The first worm support frame includes a first square collar with a limiting protrusion, a first large bolt and a first small bolt; a first large bolt is threadedly connected to the outer wall of the first square collar with a limiting protrusion, and the first large bolt can limit and fix the first square collar with a limiting protrusion on the first vertical guide rail, and a first limiting protrusion is provided at a corner of the outer wall of the first square collar with a limiting protrusion, and a first worm accommodating first through hole is provided on the horizontal side wall of the first limiting protrusion, and the first limiting protrusion is perpendicular to the side wall of the first through hole of the worm accommodating and is threaded with a first small bolt ; The second worm support frame includes a second square ring with a limiting protrusion, a second large bolt and a second small bolt; a second large bolt is threadedly connected to the outer wall of the second square ring with a limiting protrusion, and the second large bolt can limit and fix the second square ring with the limiting protrusion on the second vertical guide rail, and a second limiting protrusion is provided at a corner of the outer wall of the second square ring with the limiting protrusion, and the horizontal side wall of the second limiting protrusion is provided with a second through hole for accommodating the worm, and the second limiting protrusion is perpendicular to the side wall of the second through hole for accommodating the worm and is threaded with a second small bolt.

[0029] The worm comprises an integrally connected hexagonal worm head and a rod body, an annular groove is symmetrically arranged on the side wall of the rod body, and a spiral surface is arranged on the surface of the rod body between the two annular grooves; the two annular groove parts on the rod body are respectively penetrated and accommodated in the first worm accommodating through hole of the first limiting protrusion and the second worm accommodating through hole of the second limiting protrusion, and the rod body is limited at the two annular grooves by the first small bolt and the second small bolt respectively, so that the worm can rotate in the first worm accommodating through hole and the second worm accommodating through hole, but cannot move laterally; the worm is transmitted to the turbine worm through the spiral surface to transmit torque.

[0030] The support and measuring block is in the shape of an elongated strip as a whole, with a vertical center through hole provided in the middle, and the first boss screw is rotatably sleeved therein. The support and measuring blocks on both sides of the vertical center through hole are symmetrically provided with elongated holes. The upper end of the first support upright and the upper end of the second support upright respectively pass through the two elongated holes and are respectively screwed and fixed with the fourth upper and lower nuts and the fifth upper and lower nuts. The upper end surfaces of the two elongated side walls of each elongated hole are respectively provided with scale values ​​for accurately adjusting the positions of the first support upright and the second support upright; the displacement measuring block is in the shape of an elongated strip as a whole, with a vertical through hole provided in the middle, and the first boss screw is sleeved therein. The displacement measuring block on both sides of the vertical through hole are symmetrically provided with elongated observation holes. The upper end surfaces of the two elongated side walls of each elongated observation hole are respectively provided with scale values, and the scales thereon are used to provide a measurement reference.

[0031] The first expansion sleeve is a hollow tube body as a whole, with a first internal thread on the inner side wall at its upper end, a first external thread in the middle of its outer side wall, a first external hexagonal head on the outer side wall of its upper end, and two corresponding first strip openings on the side wall of its lower end; the second expansion sleeve is a hollow tube body as a whole, with a second internal thread on the inner side wall at its upper end, a second external thread in the middle of its outer side wall, a second external hexagonal head on the outer side wall of its upper end, and two corresponding second strip openings on the side wall of its lower end.

[0032] The first boss screw is in the shape of a rod as a whole, and a first screw external hexagonal head is provided at its upper end, and a first screw thread structure is provided at the middle and upper parts of its outer side wall, and a first screw cylindrical boss is provided at its lower end, and the upper part of the first screw cylindrical boss is a necking structure for cooperating with the expansion sleeve; the first internal thread at the upper end of the first expansion sleeve is screwed with the first screw thread structure of the first boss screw, and the lower end of the first expansion sleeve with two first strip-shaped openings cooperates with the necking structure of the first screw cylindrical boss of the first boss screw to form an expansion sleeve structure; the second boss screw is in the shape of a rod as a whole, and a first screw external hexagonal head is provided at its upper end, and a first screw thread structure is provided at the middle and upper parts of its outer side wall, and a first screw cylindrical boss is provided at its lower end ... The second screw has an external hexagonal head, and a second screw thread structure is provided in the middle and upper parts of its outer side wall, and a second screw cylindrical boss is provided at its lower end, and the upper part of the second screw cylindrical boss is a necking structure; the second internal thread at the upper end of the second expansion sleeve is screwed with the second screw thread structure of the second boss screw, and the lower end of the second expansion sleeve with two second strip openings cooperates with the necking structure of the second screw cylindrical boss of the second boss screw to form an expansion sleeve structure; the setting direction of the second expansion sleeve in which the second boss screw and the sleeve are screwed is opposite to the setting direction of the first expansion sleeve in which the first boss screw and the sleeve are screwed.

[0033] A differential gear clearance measuring system also includes a positioning block, which is an inverted frustum of a cone as a whole and has a threaded hole at its center. The positioning block is screwed onto a first external thread of a first expansion sleeve through the threaded hole. Three cylindrical wrenches are evenly distributed circumferentially on the upper end of the side wall of the positioning block. The cylindrical wrenches are used to manually rotate the positioning block so that the positioning block moves up and down along the first external thread of the first expansion sleeve. The outer wall surface of the frustum of the positioning block cooperates with the half-axle hole of the differential housing to ensure the coaxiality of the positioning block and the differential measurement device, thereby making the first expansion sleeve and the first boss screw coaxial.

[0034] A differential gear clearance measurement system also includes a differential, wherein the differential includes an upper half shell, a lower half shell, an upper half shaft gear, a lower half shaft gear, a planetary gear and a straight shaft; the differential is in contact with a measuring table, the differential shaft hole is aligned with the measuring table threaded hole of the measuring table, the second screw cylindrical boss of the second boss screw and the second strip-shaped opening end of the second expansion sleeve are accommodated in the spline hole of the lower half shaft gear, the end face of the second screw cylindrical boss is in contact with the straight shaft, and the second strip-shaped opening end of the second expansion sleeve is in contact with the inner wall of the spline hole of the lower half shaft gear; the first screw cylindrical boss of the first boss screw and the first strip-shaped opening end of the first expansion sleeve are accommodated in the spline hole of the upper half shaft gear, the end face of the first screw cylindrical boss is in contact with the straight shaft, and the first strip-shaped opening end of the first expansion sleeve is in contact with the inner wall of the spline hole of the upper half shaft gear; the positioning block threaded on the first expansion sleeve can be rotatably moved downward to contact the side face of the half shaft hole at the upper end of the upper half shell to ensure the centering of the axis.

[0035] The present application also provides a differential gear clearance measurement method, which uses the differential gear clearance measurement system to perform measurement, and the steps are as follows:

[0036] Step 1: The right-handed worm makes the torque sensor measure a torque range of 5-30Nm, and the displacement measurement block displays a value A1 of 0.065-0.075mm;

[0037] The left-handed worm makes the torque sensor measure the torque range of 5-30Nm, and the displacement measurement block displays the value A2 as 0.215-0.227mm;

[0038] The absolute value of the difference between A1 and A2 is equal to 0.140mm-0.162mm. The first measured gear clearance of the differential planetary gear axle shaft under 5-30Nm is 0.140mm-0.162mm; the first gear clearance result is obtained;

[0039] Step 2: Loosen the third nut 2.13, rotate the worm 1.8, rotate the differential planetary gear 6.5 120 degrees, replace the meshing teeth with the upper half shaft gear 6.3, tighten the third nut 2.13, adjust the displacement measuring block 2.8, and prepare to repeat the measurement in step 1;

[0040] Step 3: Repeat steps 1 and 2 above. Repeat the measurement three times. In step 2, rotate 120 degrees each time, measure three gear clearances and take the average value to obtain the accurate gear clearance.

[0041] Beneficial Effects

[0042] The expansion sleeve of the present invention is firmly connected to the half-shaft gear; it is placed vertically, and there is no interference in multi-angle measurement. The use of a fixed platform is professional and reliable. A sensor data acquisition instrument is used to collect data, and a computer processes the data to solve the differences between measurement personnel, so that the error of multiple measurements is within 3%, and the measurement time is greatly shortened. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0044] Figure 2 It is a partial front view structural schematic diagram of the present invention.

[0045] Figure 3 yes Figure 2 Schematic diagram of the overall cross-section structure.

[0046] Figure 4 yes Figure 3 Schematic diagram of the partially enlarged cross-sectional structure of part A.

[0047] Figure 5 yes Figure 3 Schematic diagram of the partially enlarged cross-sectional structure of part B.

[0048] Figure 6 yes Figure 3 Schematic diagram of the partially enlarged cross-sectional structure of part C.

[0049] Figure 7 It is a schematic diagram of the three-dimensional structure of the first expansion sleeve and the second expansion sleeve of the present invention.

[0050] Figure 8 It is a schematic diagram of the cross-sectional structure of the first expansion sleeve and the second expansion sleeve of the present invention.

[0051] Fig. 9 It is a schematic diagram of the three-dimensional structure of the first boss screw and the second boss screw of the present invention.

[0052] Fig.10 It is a schematic diagram of the three-dimensional structure of the worm of the present invention.

[0053] Fig.11 It is a schematic diagram of a partial left-view stereoscopic structure of the present invention.

[0054] Fig.12 It is a schematic diagram of the local three-dimensional structure of the present invention.

[0055] Fig.13 It is a schematic diagram of the three-dimensional structure of another embodiment of the present invention.

[0056] Fig.14 yes Fig.13 Schematic diagram of the local enlarged structure of part D.

[0057] Fig.15 yes Fig.13 Schematic diagram of the local enlarged structure of part E.

[0058] Fig.16 It is a schematic diagram of a partial cross-sectional structure of another embodiment of the present invention.

[0059] Fig.17 yes Fig.16 Schematic diagram of the partially enlarged cross-sectional structure of part F.

[0060] In the figure:

[0061] 1. Measuring platform; 1.1. Measuring table; 1.1.1. Measuring table threaded hole; 1.2. First vertical guide rail; 1.3. Second vertical guide rail; 1.4. Displacement sensor sliding bracket; 1.4.1. Sliding fixing ring; 1.4.1.1. Horizontal perforation; 1.4.2. Large screw; 1.4.3. Sensor fixing rod; 1.4.4. Small screw; 1.5. First worm support frame; 1.5.1. First square ring; 1.5.1.1. First limit protrusion; 1.5.1.2. Worm The rod contains the first through hole; 1.5.2, the first large bolt; 1.5.3, the first small bolt; 1.6, the second worm support frame; 1.6.1, the second square collar; 1.6.1.1, the second limiting protrusion; 1.6.1.2, the second through hole for the worm; 1.6.2, the second large bolt; 1.6.3, the second small bolt; 1.7, the turbine positioning plate; 1.8, the worm; 1.8.1, the hexagonal worm head; 1.8.2, the rod body; 1.8.3, the annular groove; 1.8.4, the spiral surface;

[0062] 2. Measuring device; 2.1. Turbine; 2.2. Torque sensor; 2.3. First nut; 2.4. Upper thrust roller bearing; 2.5. Support measuring block; 2.5.1. Vertical center through hole; 2.5.2. Long strip hole; 2.6. Lower thrust roller bearing; 2.7. Second nut; 2.8. Displacement measuring block; 2.8.1. Vertical through hole; 2.8.2. Long strip observation hole; 2.9. First expansion sleeve; 2.9.1. First internal thread; 2.9.2. First external thread; 2.9.3. First external hexagonal head; 2.9.4. First strip opening; 2.10. First boss screw; 2.10.1. First screw external hexagonal head; 2.10.2. First screw thread structure; 2.1 0.3, first screw cylindrical boss; 2.11, second boss screw; 2.11.1, second screw external hexagonal head; 2.11.2, second screw thread structure; 2.11.3, second screw cylindrical boss; 2.12, second expansion sleeve; 2.12.1, second internal thread; 2.12.2, second external thread; 2.12.3, second external hexagonal head; 2.12.4, second strip opening; 2.13, third nut; 2.14, first support pole; 2.15, second support pole; 2.16, fourth upper and lower nuts; 2.17, fifth upper and lower nuts; 2.18, displacement sensor; 2.19, positioning block; 2.19.1, threaded hole; 2.19.2, cylindrical wrench;

[0063] 3. Computer;

[0064] 4. Data acquisition instrument;

[0065] 5. Stabilized power supply;

[0066] 6. Differential; 6.1. Upper housing; 6.2. Lower housing; 6.3. Upper half shaft gear; 6.4. Lower half shaft gear; 6.5. Planetary gear; 6.6. Straight shaft. DETAILED DESCRIPTION

[0067] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, not all.

[0068] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0069] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0070] Example 1

[0071] See also Figure 1-Figure 17 As shown, a differential gear clearance measurement system includes a measurement platform 1, a measurement device 2, a computer 3, a data acquisition instrument 4 and a voltage-stabilized power supply 5;

[0072] The measuring platform 1 comprises a measuring table 1.1, a first vertical guide rail 1.2, a second vertical guide rail 1.3, a displacement sensor sliding bracket 1.4, a first worm support frame 1.5, a second worm support frame 1.6, a turbine positioning plate 1.7 and a worm 1.8;

[0073] The first vertical guide rail 1.2 and the second vertical guide rail 1.3 are respectively fixed vertically to the upper end surface of the measuring table 1.1;

[0074] The displacement sensor sliding bracket 1.4 is slidably limited and sleeved in the middle of the first vertical guide rail 1.2;

[0075] The first worm support frame 1.5 and the second worm support frame 1.6 are respectively slidably limited and sleeved on the upper parts of the first vertical guide rail 1.2 and the second vertical guide rail 1.3;

[0076] The two ends of the turbine positioning plate 1.7 are respectively slidably sleeved on the upper ends of the first vertical guide rail 1.2 and the second vertical guide rail 1.3, and the two ends of the turbine positioning plate 1.7 are respectively in contact with the upper end surfaces of the first worm support frame 1.5 and the second worm support frame 1.6;

[0077] The worm 1.8 is horizontally sleeved in the first worm support frame 1.5 and the second worm support frame 1.6, and the sleeve joints of the worm 1.8 and the first worm support frame 1.5 and the second worm support frame 1.6 can be rotated and limited;

[0078] The measuring device 2 includes, from top to bottom, a turbine 2.1, a torque sensor 2.2, a first nut 2.3, an upper thrust roller bearing 2.4, a support measuring block 2.5, a lower thrust roller bearing 2.6, a second nut 2.7, a displacement measuring block 2.8, a first expansion sleeve 2.9, a first boss screw 2.10, a second boss screw 2.11, a second expansion sleeve 2.12, and a third nut 2.13;

[0079] The support and measurement block 2.5 also includes a first support upright rod 2.14, a second support upright rod 2.15, a fourth upper and lower nut 2.16, a fifth upper and lower nut 2.17 and a displacement sensor 2.18;

[0080] The upper end of the turbine 2.1 is fitted with a circular hole on the turbine positioning plate 1.7 through the turbine shaft, and the hexagonal head at the lower end of the turbine 2.1 is sleeved with the hexagonal hole at the upper end of the torque sensor 2.2; the turbine 2.1 is meshed with the corresponding position of the worm 1.8;

[0081] The first boss screw 2.10 is respectively sleeved with the first expansion sleeve 2.9, the displacement measuring block 2.8, the second nut 2.7, the lower thrust roller bearing 2.6, the support measuring block 2.5, the upper thrust roller bearing 2.4, and the first nut 2.3 from bottom to top; the upper hexagonal head of the first boss screw 2.10 is sleeved with the hexagonal hole at the lower end of the torque sensor 2.2;

[0082] The first nut 2.3 and the second nut 2.7 sandwich the upper thrust roller bearing 2.4, the support measuring block 2.5, and the lower thrust roller bearing 2.6 therebetween in sequence, and the first nut 2.3 and the second nut 2.7 are screwed and fixed with the first boss screw 2.10, and the first boss screw 2.10 can rotate freely in the support measuring block 2.5;

[0083] The lower ends of the first support rod 2.14 and the second support rod 2.15 are respectively in vertical contact with the upper surface of the measuring table 1.1, and the upper ends of the first support rod 2.14 and the second support rod 2.15 respectively penetrate the upper end surfaces of both sides of the support measuring block 2.5 and are respectively screwed and fixed with the fourth upper and lower nuts 2.16 and the fifth upper and lower nuts 2.17, so that the first boss screw 2.10 is suspended above the measuring table 1.1;

[0084] The first expansion sleeve 2.9 is screwed and fixed with the first boss screw 2.10, and the second nut 2.7 and the first expansion sleeve 2.9 clamp the displacement measuring block 2.8 between them, and the displacement measuring block 2.8 rotates synchronously with the first boss screw 2.10;

[0085] The displacement sensor 2.18 is universally hinged on the displacement sensor sliding bracket 1.4, and the end of the displacement sensor 2.18 is slidably contacted with the side wall of the displacement measuring block 2.8;

[0086] The lower end of the first expansion sleeve 2.9 can contact and expand the lower end of the first boss screw 2.10;

[0087] The second boss screw 2.11 is arranged in the opposite direction to the first boss screw 2.10. A second expansion sleeve 2.12 is threadedly engaged with the second boss screw 2.11. The upper end of the second expansion sleeve 2.12 can contact and expand with the upper end of the second boss screw 2.11.

[0088] The upper end of the second boss screw 2.11 is adjacent to the lower end of the first boss screw 2.10, and the second boss screw 2.11 is coaxial with the first boss screw 2.10. The upper end of the second expansion sleeve 2.12 sleeved on the second boss screw 2.11 is exposed on the upper surface of the measuring table 1.1, and the outer side wall of the upper end of the second expansion sleeve 2.12 is threadedly connected with the measuring table threaded hole 1.1.1 of the measuring table 1.1. The third nut 2.13 is screwed on the outer thread of the second expansion sleeve 2.12 on the lower surface of the measuring table 1.1, and the upper end surface of the third nut 2.13 contacts the lower surface of the measuring table 1.1.

[0089] The computer 3, the data acquisition instrument 4 and the voltage-stabilized power supply 5 are electrically connected in sequence through wires;

[0090] The torque sensor 2.2 and the displacement sensor 2.18 are electrically connected to the data acquisition instrument 4 through wires respectively.

[0091] The displacement sensor sliding bracket 1.4 includes a sliding fixing ring 1.4.1, a large screw 1.4.2, a sensor fixing rod 1.4.3, and a small screw 1.4.4; the sliding fixing ring 1.4.1 is slidably sleeved on the first vertical guide rail 1.2, and is limitedly fixed to the first vertical guide rail 1.2 by the large screw 1.4.2 penetrated through the outer wall of the sliding fixing ring 1.4.1; a transverse through hole 1.4.1.1 is provided on the side wall of the sliding fixing ring 1.4.1 corresponding to the side of the displacement measuring block 2.8, and the sensor fixing rod 1.4.3 is slidably sleeved in the transverse through hole 1.4.1.1, and the front end of the sensor fixing rod 1.4.3 is universally hinged with a displacement sensor 2.18, and a small screw 1.4.4 is screwed on the side wall of the sliding fixing ring 1.4.1 corresponding to the side of the sensor fixing rod 1.4.3, and the small screw 1.4.4 can limit and fix the sensor fixing rod 1.4.3.

[0092] The first worm support frame 1.5 comprises a first square collar 1.5.1 with a limiting protrusion, a first large bolt 1.5.2 and a first small bolt 1.5.3; the first square collar 1.5.1 with a limiting protrusion is threadedly connected with a first large bolt 1.5.2, and the first large bolt 1.5.2 can limit and fix the first square collar 1.5.1 with a limiting protrusion on the first vertical guide rail 1.2, and a first limiting protrusion 1.5.1.1 is provided at a corner of the outer wall of the first square collar 1.5.1 with a limiting protrusion, and a first worm accommodating first through hole 1.5.1.2 is provided on the horizontal side wall of the first limiting protrusion 1.5.1.1, and the first small bolt 1.5.3 is screwed on the side wall of the first limiting protrusion 1.5.1.1 perpendicular to the first worm accommodating first through hole 1.5.1.2 ; The second worm support frame 1.6 includes a second square collar 1.6.1 with a limiting protrusion, a second large bolt 1.6.2 and a second small bolt 1.6.3; the second square collar 1.6.1 with a limiting protrusion is threadedly connected to the outer wall thereof, and the second large bolt 1.6.2 can limit and fix the second square collar 1.6.1 with a limiting protrusion on the second vertical guide rail 1.3, and a second limiting protrusion 1.6.1.1 is provided at a corner of the outer wall of the second square collar 1.6.1 with a limiting protrusion, and a second through hole 1.6.1.2 for accommodating the worm is provided on the horizontal side wall of the second limiting protrusion 1.6.1.1, and a second small bolt 1.6.3 is screwed on the second limiting protrusion 1.6.1.1 perpendicular to the side wall of the second through hole 1.6.1.2 for accommodating the worm.

[0093] The worm 1.8 comprises an integrally connected hexagonal worm head 1.8.1 and a rod body 1.8.2, and an annular groove 1.8.3 is symmetrically provided on the side wall of the rod body 1.8.2, and a spiral surface 1.8.4 is provided on the rod body surface between the two annular grooves 1.8.3; the two annular grooves 1.8.3 on the rod body 1.8.2 are respectively penetrated and accommodated in the first worm accommodating through hole 1.5.1.2 of the first limiting protrusion 1.5.1.1 and the second worm accommodating through hole 1.6.1.2 of the second limiting protrusion 1.6.1.1, and the rod body 1.8.2 is limited at the two annular grooves 1.8.3 by the first small bolt 1.5.3 and the second small bolt 1.6.3; the worm 1.8 is worm-driven with the turbine 2.1 through the spiral surface 1.8.4.

[0094] The support and measurement block 2.5 is in the shape of an elongated strip as a whole, and a vertical central through hole 2.5.1 is provided in the middle, and the first boss screw rod 2.10 is rotatably sleeved therein. The support and measurement block 2.5 on both sides of the vertical central through hole 2.5.1 is symmetrically provided with elongated holes 2.5.2, and the upper end of the first support vertical rod 2.14 and the upper end of the second support vertical rod 2.15 respectively pass through the two elongated holes 2.5.2 and are respectively connected with the fourth upper and lower nuts 2.16 and the fifth upper and lower nuts 2.16. The nut 2.17 is screwed and fixed, and the upper end faces of the two long side walls of each long hole 2.5.2 are respectively provided with scale values; the displacement measuring block 2.8 is long as a whole, and a vertical through hole 2.8.1 is provided in the middle, and the first boss screw 2.10 is sleeved therein, and long observation holes 2.8.2 are symmetrically provided on the displacement measuring block 2.8 on both sides of the vertical through hole 2.8.1, and the upper end faces of the two long side walls of each long observation hole 2.8.2 are respectively provided with scale values.

[0095] The first expansion sleeve 2.9 is a hollow tube as a whole, with a first internal thread 2.9.1 on the inner side wall at its upper end, a first external thread 2.9.2 on the middle of the outer side wall, a first external hexagonal head 2.9.3 on the outer side wall at its upper end, and two corresponding first strip openings 2.9.4 on the side wall at its lower end; the second expansion sleeve 2.12 is a hollow tube as a whole, with a second internal thread 2.12.1 on the inner side wall at its upper end, a second external thread 2.12.2 on the middle of the outer side wall, a second external hexagonal head 2.12.3 on the outer side wall at its upper end, and two corresponding second strip openings 2.12.4 on the side wall at its lower end.

[0096] The first boss screw 2.10 is in the shape of a rod as a whole, and is provided with a first screw external hexagonal head 2.10.1 at its upper end, a first screw thread structure 2.10.2 at the middle and upper parts of its outer wall, and a first screw cylindrical boss 2.10.3 at its lower end, and the upper part of the first screw cylindrical boss 2.10.3 is a necking structure; the first internal thread 2.9.1 at the upper end of the first expansion sleeve 2.9 is screwed with the first screw thread structure 2.10.2 of the first boss screw 2.10, and the lower end of the first expansion sleeve 2.9 with two first strip openings 2.9.4 cooperates with the necking structure of the first screw cylindrical boss 2.10.3 of the first boss screw 2.10 to form an expansion sleeve structure; the second boss screw 2.11 is in the shape of a rod as a whole, and is provided with a second screw external hexagonal head 2. 11.1, a second screw thread structure 2.11.2 is provided at the middle and upper parts of its outer side wall, a second screw cylindrical boss 2.11.3 is provided at its lower end, and the upper part of the second screw cylindrical boss 2.11.3 is a necking structure; the second internal thread 2.12.1 at the upper end of the second expansion sleeve 2.12 is screwed with the second screw thread structure 2.11.2 of the second boss screw 2.11, and the lower end of the second expansion sleeve 2.12 with two second strip openings 2.12.4 cooperates with the necking structure of the second screw cylindrical boss 2.11.3 of the second boss screw 2.11 to form an expansion sleeve structure; the setting direction of the second boss screw 2.11 and the second expansion sleeve 2.12 that is screwed together is opposite to the setting direction of the first boss screw 2.10 and the first expansion sleeve 2.9 that is screwed together.

[0097] A differential gear clearance measuring system also includes a positioning block 2.19, which is an inverted frustum as a whole and has a threaded hole 2.19.1 at its center. The positioning block 2.19 is screwed onto a first external thread 2.9.2 of a first expansion sleeve 2.9 through the threaded hole 2.19.1, and three cylindrical wrenches 2.19.2 are evenly distributed circumferentially on the upper end of the side wall of the positioning block 2.19.

[0098] Example 2

[0099] See also Figure 1-Figure 17 As shown, a differential gear clearance measurement system is different from embodiment 1 in that:

[0100] The differential 6 is also included, and the differential 6 includes an upper half shell 6.1, a lower half shell 6.2, an upper half shaft gear 6.3, a lower half shaft gear 6.4, a planetary gear 6.5 and a straight shaft 6.6; the differential 6 is in contact with the measuring table 1.1, the shaft hole of the differential 6 is aligned with the measuring table threaded hole 1.1.1 of the measuring table 1.1, the second screw cylindrical boss 2.11.3 of the second boss screw 2.11 and the second strip opening 2.12.4 of the second expansion sleeve 2.12 are accommodated in the spline hole of the lower half shaft gear 6.4, the end face of the second screw cylindrical boss 2.11.3 is in contact with the straight shaft 6.6, and the second expansion sleeve The second strip opening 2.12.4 end of 2.12 is fitted with the inner wall of the spline hole of the lower half-shaft gear 6.4; the first screw cylindrical boss 2.10.3 of the first boss screw 2.10 and the first strip opening 2.9.4 end of the first expansion sleeve 2.9 are accommodated in the spline hole of the upper half-shaft gear 6.3, the end face of the first screw cylindrical boss 2.10.3 contacts the straight shaft 6.6, and the first strip opening 2.9.4 end of the first expansion sleeve 2.9 is fitted with the inner wall of the spline hole of the upper half-shaft gear 6.3; the positioning block 2.19 threaded on the first expansion sleeve 2.9 can be rotated downward to contact the side of the half-shaft hole at the upper end of the upper shell 6.1.

[0101] Assembly differential gear backlash measurement system

[0102] Place the differential 6 on the measuring table 1.1, align the shaft hole of the differential 6 with the measuring table threaded hole 1.1.1 of the measuring table 1.1, insert the assembly of the second boss screw 2.11, the second expansion sleeve 2.12 and the third nut 2.13 from below the measuring table threaded hole 1.1.1 and press against the straight shaft 6.6, tighten the second boss screw 2.11 and the second expansion sleeve 2.12 relatively, so that the second expansion sleeve 2.12 is stretched open and fits with the inner wall of the spline hole of the lower half shaft gear 6.4, forming a better alignment and greater friction; tighten the third nut 2.13 to make it fit with the lower surface of the measuring table 1.1, continue to tighten, provide downward pulling force, pull down the lower half shaft gear 6.4 of the measured part to fit it with the differential lower half shell 6.2, eliminate the gap between the lower half shaft gear 6.4 and the differential lower half shell 6.2, and make the measurement more accurate.

[0103] Insert the assembly consisting of the first nut 2.3, the upper thrust roller bearing 2.4, the support measuring block 2.5, the lower thrust roller bearing 2.6, the second nut 2.7, the displacement measuring block 2.8, the positioning block 2.19, the first expansion sleeve 2.9, the first boss screw 2.10, the first support rod 2.14, the second support rod 2.15, the fourth upper and lower nuts 2.16, and the fifth upper and lower nuts 2.17 from the upper half-shaft hole of the upper half housing 6.1 of the differential 6 and press against the straight shaft 6.6, and tighten the first boss screw 2.10 and the first expansion sleeve 2.9 relatively to make the first expansion sleeve 2.9 open and fit with the inner wall of the spline hole of the upper half-shaft gear 6.3 to form a better alignment and greater friction; adjust the fourth lower nut 2.16, the fifth upper and lower nuts 2.17 below the support measuring block 2.5. The lower nut 2.17 makes the first supporting rod 2.14 and the second supporting rod 2.15 fit with the upper surface of the measuring table 1.1 respectively, and the fourth lower nut 2.16 and the fifth lower nut 2.17 are tightened continuously to provide upward supporting force, so that the upper half shaft gear 6.3 of the measured piece is pulled up to fit with the upper half shell 6.1, and the gap between the upper half shaft gear 6.3 and the upper half shell 6.1 is eliminated to make the measurement more accurate, and then the fourth upper nut 2.16 and the fifth upper nut 2.17 above the supporting measuring block 2.5 are tightened to fix the first supporting rod 2.14 and the second supporting rod 2.15; the positioning block 2.19 is rotated to adjust the side of its truncated cone to contact the side of the half shaft hole at the upper end of the upper half shell 6.1 and ensure the axis is aligned, and the positioning block 2.19 is slightly loosened in the reverse direction to ensure relative frictionlessness.

[0104] Assemble the torque sensor 2.2, turbine 2.1 and turbine positioning plate 1.7 in sequence; the horizontal distance between the contact point between the upper half shaft gear 6.3 and the tooth surface of the planetary gear 6.5 and the center point axis of the threaded hole 1.1.1 of the measuring table is D1; ​​the horizontal distance between the contact point between the displacement sensor 2.18 and the displacement measuring block 2.8 and the center point axis of the threaded hole 1.1.1 of the measuring table is D2; adjust the contact point position between the end of the displacement sensor 2.18 and the side wall of the displacement measuring block 2.8 so that D2 is equal to D1; then adjust the angle of the displacement sensor 2.18 so that it is perpendicular to the side wall of the displacement measuring block 2.8.

[0105] The displacement measuring block 2.8, the torque sensor 2.2, the computer 3, the data acquisition instrument 4 and the voltage-stabilized power supply 5 are electrically connected to each other, and the parameters of each sensor are adjusted.

[0106] Example 3

[0107] See also Figure 1-Figure 17 As shown, the present application also provides a differential gear clearance measurement method, which uses the differential gear clearance measurement system for measurement, and the steps are as follows:

[0108] Step 1: The right-handed worm 1.8 makes the torque sensor 2.2 measure the torque range to be 18Nm, and the displacement measuring block 2.8 displays the value A1 to be 0.07mm;

[0109] The left-handed worm 1.8 causes the torque sensor 2.2 to measure a torque range of 18 Nm, and the displacement measuring block 2.8 displays a value A2 of 0.221 mm;

[0110] The absolute value of the difference between A1 and A2 is equal to 0.151mm. The first gear clearance of the differential planetary gear axle shaft measured at 18Nm is 0.151mm; the first gear clearance result is obtained;

[0111] Step 2: Loosen the third nut 2.13, rotate the worm 1.8, rotate the differential planetary gear 6.5 120 degrees, replace the meshing teeth with the upper half shaft gear 6.3, tighten the third nut 2.13, adjust the displacement measuring block 2.8, and prepare to repeat the measurement in step 1;

[0112] Step 3: Repeat steps 1 and 2 above. Repeat the measurement three times. In step 2, rotate 120 degrees each time, measure three gear clearances and take the average value to obtain the accurate gear clearance.

[0113] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A differential gear clearance measurement system; characterized in that: It comprises a measuring platform (1), a measuring device (2), a computer (3), a data acquisition instrument (4) and a voltage-stabilized power supply (5); The measuring platform (1) comprises a measuring table (1.1), a first vertical guide rail (1.2), a second vertical guide rail (1.3), a displacement sensor sliding bracket (1.4), a first worm support frame (1.5), a second worm support frame (1.6), a turbine positioning plate (1.7) and a worm (1.8); The first vertical guide rail (1.2) and the second vertical guide rail (1.3) are respectively fixed vertically to the upper end surface of the measuring table (1.1); The displacement sensor sliding bracket (1.4) is slidably limited and sleeved on the middle part of the first vertical guide rail (1.2); The first worm support frame (1.5) and the second worm support frame (1.6) are respectively slidably and position-limitingly sleeved on the upper parts of the first vertical guide rail (1.2) and the second vertical guide rail (1.3); The two ends of the turbine positioning plate (1.7) are respectively slidably sleeved on the upper ends of the first vertical guide rail (1.2) and the second vertical guide rail (1.3), and the two ends of the turbine positioning plate (1.7) are respectively in position-limiting contact with the upper end surfaces of the first worm support frame (1.5) and the second worm support frame (1.6); The worm (1.8) is horizontally sleeved in the first worm support frame (1.5) and the second worm support frame (1.6), and the sleeve joints between the worm (1.8) and the first worm support frame (1.5) and the second worm support frame (1.6) are rotatably limited; The measuring device (2) comprises, from top to bottom, a turbine (2.1), a torque sensor (2.2), a first nut (2.3), an upper thrust roller bearing (2.4), a support measuring block (2.5), a lower thrust roller bearing (2.6), a second nut (2.7), a displacement measuring block (2.8), a first expansion sleeve (2.9), a first boss screw (2.10), a second boss screw (2.11), a second expansion sleeve (2.12), and a third nut (2.13); The support measurement block (2.5) also includes a first support upright rod (2.14), a second support upright rod (2.15), fourth upper and lower nuts (2.16), fifth upper and lower nuts (2.17), and a displacement sensor (2.18); The upper end of the turbine (2.1) is clearance-matched with the circular hole on the turbine positioning plate (1.7) through the turbine shaft, and the hexagonal head at the lower end of the turbine (2.1) is sleeved with the hexagonal hole at the upper end of the torque sensor (2.2); the turbine (2.1) is meshed with the worm (1.8) at corresponding positions; The first boss screw (2.10) is respectively sleeved with a first expansion sleeve (2.9), a displacement measuring block (2.8), a second nut (2.7), a lower thrust roller bearing (2.6), a support measuring block (2.5), an upper thrust roller bearing (2.4), and a first nut (2.3) from bottom to top; the hexagonal head at the upper end of the first boss screw (2.10) is sleeved with the hexagonal hole at the lower end of the torque sensor (2.2); The first nut (2.3) and the second nut (2.7) sequentially sandwich the upper thrust roller bearing (2.4), the support measuring block (2.5), and the lower thrust roller bearing (2.6) therebetween, and the first nut (2.3) and the second nut (2.7) are screwed and fixed with the first boss screw rod (2.10), and the first boss screw rod (2.10) can rotate freely in the support measuring block (2.5); The lower ends of the first support rod (2.14) and the second support rod (2.15) are respectively in vertical contact with the upper surface of the measuring table (1.1); the upper ends of the first support rod (2.14) and the upper ends of the second support rod (2.15) respectively penetrate the upper end surfaces of both sides of the supporting measuring block (2.5) and are respectively screwed and fixed with the fourth upper and lower nuts (2.16) and the fifth upper and lower nuts (2.17), so that the first boss screw (2.10) is suspended above the measuring table (1.1); The first expansion sleeve (2.9) is screwed and fixed with the first boss screw rod (2.10), the second nut (2.7) and the first expansion sleeve (2.9) clamp and fix the displacement measuring block (2.8) between the two, and the displacement measuring block (2.8) and the first boss screw rod (2.10) rotate synchronously; The displacement sensor (2.18) is universally hinged on the displacement sensor sliding bracket (1.4), and the end of the displacement sensor (2.18) is slidably contacted with the side wall of the displacement measuring block (2.8); The lower end of the first expansion sleeve (2.9) can contact and expand the lower end of the first boss screw (2.10); The second boss screw (2.11) is arranged in a direction opposite to that of the first boss screw (2.10); a second expansion sleeve (2.12) is sleeved and threadedly engaged with the second boss screw (2.11); and the upper end of the second expansion sleeve (2.12) can contact and expand the upper end of the second boss screw (2.11); The upper end of the second boss screw (2.11) is adjacent to the lower end of the first boss screw (2.10), and the second boss screw (2.11) is coaxial with the first boss screw (2.10); the upper end of the second expansion sleeve (2.12) sleeved on the second boss screw (2.11) is exposed on the upper surface of the measuring table (1.1), and the outer wall of the upper end of the second expansion sleeve (2.12) is threadedly connected to the measuring table threaded hole (1.1.1) of the measuring table (1.1); the third nut (2.13) is threadedly engaged with the outer thread of the second expansion sleeve (2.12) on the lower surface of the measuring table (1.1), and the upper end surface of the third nut (2.13) is in contact with the lower surface of the measuring table (1.1); The computer (3), the data acquisition instrument (4) and the voltage-stabilized power supply (5) are electrically connected in sequence via wires; The torque sensor (2.2) and the displacement sensor (2.18) are electrically connected to the data acquisition instrument (4) via wires respectively.

2. A differential gear clearance measurement system according to claim 1, characterized in that: The displacement sensor sliding bracket (1.4) comprises a sliding fixing collar (1.4.1), a large screw (1.4.2), a sensor fixing rod (1.4.3), and a small screw (1.4.4); the sliding fixing collar (1.4.1) is slidably sleeved on the first vertical guide rail (1.2) and is positionally fixed to the first vertical guide rail (1.2) by means of a large screw (1.4.2) penetrating the outer wall of the sliding fixing collar (1.4.1); a transverse through hole ( 1.4.1.1), the sensor fixing rod (1.4.3) is slidably connected to the transverse perforation ( 1.4.1.1), the front end of the sensor fixing rod (1.4.3) is universally hinged with a displacement sensor (2.18), and the side wall of the sliding fixing ring (1.4.1) corresponding to the sensor fixing rod (1.4.3) is screwed with a small screw ( 1.4.4), the small screw (1.4.4) can limit and fix the sensor fixing rod (1.4.3).

3. A differential gear clearance measurement system according to claim 1, characterized in that: The first worm support frame (1.5) comprises a first square collar (1.5.1) with a limiting protrusion, a first large bolt (1.5.2) and a first small bolt (1.5.3); the first large bolt (1.5.2) is threadedly connected to the outer wall of the first square collar (1.5.1) with a limiting protrusion, and the first large bolt (1.5.2) can limit and fix the first square collar (1.5.1) with a limiting protrusion on the first vertical guide rail (1.2); a first limiting protrusion (1.5.3) is provided at one corner of the outer wall of the first square collar (1.5.1) with a limiting protrusion. 1.5.1.1), the horizontal side wall of the first limiting protrusion (1.5.1.1) is provided with a first through hole (1.5.1.2) for accommodating the worm, and the first limiting protrusion (1.5.1.1) is vertically connected to the side wall of the first through hole (1.5.1.2) for accommodating the worm with a first small bolt (1.5.3); the second worm support frame (1.6) comprises a second square collar (1.6.1) with a limiting protrusion, a second large bolt (1.6.2) and a second small bolt (1.6.3); the outer side wall of the second square collar (1.6.1) with a limiting protrusion is threadedly connected with a second large bolt (1.6.2), and the second large bolt (1.6.2) can limit and fix the second square collar (1.6.1) with a limiting protrusion on the second vertical guide rail (1.3), and a second limiting protrusion (1.6.3) is provided at one corner of the outer side wall of the second square collar (1.6.1) with a limiting protrusion 1.6.1.1), the second limiting protrusion ( 1.6.1.1) The horizontal side wall is provided with a second through hole for accommodating the worm ( 1.6.1.2), the second limiting protrusion (1.6.1.1) is perpendicular to the side wall of the second through hole (1.6.1.2) for accommodating the worm and a second small bolt (1.6.3) is screwed therein.

4. A differential gear clearance measurement system according to claim 3, characterized in that: The worm (1.8) comprises an integrally connected hexagonal worm head (1.8.1) and a rod body (1.8.2); a side wall of the rod body (1.8.2) is provided with annular grooves (1.8.3) symmetrically on the left and right; a helical surface (1.8.4) is provided on the rod body surface between the two annular grooves (1.8.3); the two annular grooves (1.8.3) on the rod body (1.8.2) are respectively penetrated and accommodated in the first limiting protrusion ( 1.5.1.1) of the worm gear to accommodate the first through hole (1.5.1.2) and the second limiting protrusion ( The worm (1.6.1.1) is accommodated in the second through hole (1.6.1.2), and the rod body (1.8.2) is respectively limited by the first small bolt (1.5.3) and the second small bolt (1.6.3) at two annular grooves (1.8.3); the worm (1.8) is driven by the worm of the turbine (2.1) through the spiral surface (1.8.4).

5. The differential gear clearance measurement system according to claim 1, characterized in that: The support and measurement block (2.5) is in the shape of an elongated strip as a whole, and a vertical central through hole (2.5.1) is provided in the middle, and the first boss screw rod (2.10) is rotatably sleeved therein. The support and measurement block (2.5) on both sides of the vertical central through hole (2.5.1) is symmetrically provided with elongated holes (2.5.2), and the upper end of the first support vertical rod (2.14) and the upper end of the second support vertical rod (2.15) respectively pass through the two elongated holes (2.5.2) and are respectively connected to the fourth upper and lower nuts (2.16) and the fifth upper and lower nuts (2.17). The lower nut (2.17) is screwed and fixed, and the upper end surfaces of the two long side walls of each long hole (2.5.2) are respectively provided with scale values; the displacement measuring block (2.8) is overall long and has a vertical through hole (2.8.1) in the middle, and the first boss screw (2.10) is sleeved therein, and the displacement measuring block (2.8) on both sides of the vertical through hole (2.8.1) is symmetrically provided with long observation holes (2.8.2), and the upper end surfaces of the two long side walls of each long observation hole (2.8.2) are respectively provided with scale values.

6. A differential gear clearance measurement system according to claim 1, characterized in that: The first expansion sleeve (2.9) is a hollow tube body as a whole, with a first internal thread (2.9.1) on the inner side wall at its upper end, a first external thread (2.9.2) in the middle of the outer side wall, a first external hexagonal head (2.9.3) on the outer side wall at its upper end, and two corresponding first strip-shaped openings (2.9.4) on the side wall at its lower end; the second expansion sleeve (2.12) is a hollow tube body as a whole, with a second internal thread (2.12.1) on the inner side wall at its upper end, a second external thread (2.12.2) in the middle of the outer side wall, a second external hexagonal head (2.12.3) on the outer side wall at its upper end, and two corresponding second strip-shaped openings (2.12.4) on the side wall at its lower end.

7. A differential gear clearance measurement system according to claim 6, characterized in that: The first boss screw (2.10) is in the shape of a rod as a whole, and has a first screw external hexagonal head (2.10.1) at its upper end, and a first screw thread structure (2.10.1) at the middle and upper parts of its outer side wall. 2.10.2), a first screw cylindrical boss (2.10.3) is provided at the lower end thereof, the upper part of the first screw cylindrical boss (2.10.3) is a necking structure; the first internal thread (2.9.1) at the upper end of the first expansion sleeve (2.9) and the first screw thread structure (2.10) of the first boss screw (2.10) are connected to each other. 2.10.2) is screwed together, the lower end of the first expansion sleeve (2.9) having two first strip openings (2.9.4) cooperates with the necking structure of the first screw cylindrical boss (2.10.3) of the first boss screw (2.10) to form an expansion sleeve structure; the second boss screw (2.11) is in the shape of a rod as a whole, and the upper end thereof is provided with a second screw external hexagonal head (2.11.1), and the middle and upper parts of the outer wall thereof are provided with a second screw thread structure ( 2.11.2), a second screw cylindrical boss (2.11.3) is provided at the lower end thereof, the upper part of the second screw cylindrical boss (2.11.3) is a necking structure; the second internal thread (2.12.1) at the upper end of the second expansion sleeve (2.12) and the second screw thread structure (2.11) of the second boss screw (2.11) The second expansion sleeve (2.12) is screwed together with the second boss screw (2.11.2), and the lower end of the second expansion sleeve (2.12) having two second strip openings (2.12.4) cooperates with the necking structure of the second screw cylindrical boss (2.11.3) of the second boss screw (2.11) to form an expansion sleeve structure; the setting direction of the second boss screw (2.11) and the sleeve-screwed second expansion sleeve (2.12) is opposite to the setting direction of the first boss screw (2.10) and the sleeve-screwed first expansion sleeve (2.9).

8. A differential gear clearance measurement system according to claim 6, characterized in that: It also includes a positioning block (2.19), which is in the shape of an inverted truncated cone as a whole, and has a threaded hole (2.19.1) at its center. The positioning block (2.19) is screwed onto the first external thread (2.9.2) of the first expansion sleeve (2.9) through the threaded hole (2.19.1), and three cylindrical wrenches (2.19.2) are evenly distributed circumferentially on the upper end of the side wall of the positioning block (2.19).

9. A differential gear clearance measurement system according to any one of claims 1 to 8, characterized in that: The differential (6) also includes an upper housing (6.1), a lower housing (6.2), an upper half shaft gear (6.3), a lower half shaft gear (6.4), a planetary gear (6.5) and a straight shaft (6.6); the differential (6) contacts the measuring table (1.1); the shaft hole of the differential (6) is aligned with the measuring table threaded hole (1.1.1) of the measuring table (1.1); the second screw cylindrical boss (2.11.3) of the second boss screw (2.11) and the second strip opening (2.12.4) end of the second expansion sleeve (2.12) are accommodated in the spline hole of the lower half shaft gear (6.4); the end surface of the second screw cylindrical boss (2.11.3) contacts the straight shaft (6.6); The second strip opening (2.12.4) end of the second expansion sleeve (2.12) is fitted with the inner wall of the spline hole of the lower half shaft gear (6.4); the first screw cylindrical boss (2.10.3) of the first boss screw (2.10) and the first strip opening (2.9.4) end of the first expansion sleeve (2.9) are accommodated in the spline hole of the upper half shaft gear (6.3); the end surface of the first screw cylindrical boss (2.10.3) contacts the straight shaft (6.6); the first strip opening (2.9.4) end of the first expansion sleeve (2.9) is fitted with the inner wall of the spline hole of the upper half shaft gear (6.3); the positioning block (2.19) threaded on the first expansion sleeve (2.9) can be rotated downward to contact the side surface of the upper half shaft hole of the upper half shell (6.1).

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