Spline fitting driving mechanism and automobile motor resolver angle detection method

Abstract

The invention discloses a spline fitting driving mechanism and an automobile motor resolver angle detection method. The spline fitting driving mechanism comprises a spline driving assembly which is used for fitting with a motor spline shaft and driving the motor spline shaft to rotate; the compensation platform is used for adjusting the position of the spline driving assembly in the XY direction of the horizontal plane so as to ensure that the spline driving assembly can be successfully butted with the motor spline shaft; the moving assembly is used for driving the compensation platform to move back and forth in the vertical direction so that the spline driving assembly can be away from or close to the motor spline shaft. The spline fitting driving mechanism comprises the spline driving assembly, the compensation platform and the moving assembly, the compensation platform can adjust the position of the spline driving assembly in the X direction and the Y direction of the horizontal plane, and the positioning error generated by indirect positioning between a work station and a product through a tray is compensated; the technical problem that an existing spline fitting driving mechanism is not suitable for the working condition of indirect positioning of a motor and a work station is solved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile manufacturing, and in particular to a spline fitting drive mechanism and a method for detecting a rotation angle of an automobile motor. Background Art

[0002] The motor of new energy vehicles needs to detect the rotation angle. During the detection process, an external mechanism is required to drive the motor spline shaft, that is, a spline fitting drive mechanism is needed to achieve fitting with the motor spline shaft and drive the motor spline shaft to rotate.

[0003] In the production line of new energy vehicle motors, the motors are placed on pallets and transported by conveyors to complete various assembly and testing processes. The workstation and the motor are indirectly positioned through the pallet (the motor is positioned with the pallet through the positioning pins, and the pallet is positioned with the workstation through the positioning pins), which will produce a large positioning error, so a compensation mechanism is needed to make up for the positioning error.

[0004] However, the existing spline fitting drive mechanism is used in the context of direct positioning of the motor and the workstation, and has no compensation mechanism. Therefore, it is not suitable for the working condition of indirect positioning of the motor and the workstation. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a spline fitting drive mechanism and a method for detecting the rotation angle of an automobile motor, so as to solve the technical problem that the existing spline fitting drive mechanism is not suitable for the working condition of indirect positioning of the motor and the workstation.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] On the one hand, the present invention provides a spline fitting drive mechanism, including: a spline drive assembly, used to fit with the spline shaft of a motor and drive the spline shaft of the motor to rotate; a compensation platform, used to adjust the position of the spline drive assembly in the horizontal plane XY direction to ensure that the spline drive assembly can be successfully docked with the spline shaft of the motor; a moving assembly, used to drive the compensation platform to move back and forth in the vertical direction to make the spline drive assembly move away from or close to the spline shaft of the motor.

[0008] Preferably, the spline drive assembly includes a servo motor, a motor fixing plate, a coupling, a motor support column, a base plate and a spindle assembly, the base plate is floatingly connected to the compensation platform, the motor fixing plate is installed under the base plate through the motor support column, the servo motor is fixedly installed on the motor fixing plate, the spindle assembly includes a spline docking shaft, a spindle and a bearing assembly sleeved on the outside of the spindle, the spline docking shaft is provided with key teeth fitting with the spline shaft of the motor, the bearing assembly is embedded in the base plate, the upper end of the spindle is connected to the spline docking shaft, and the lower end of the spindle is connected to the output shaft of the servo motor through the coupling.

[0009] Preferably, the main shaft assembly also includes an adapter flange, a telescopic shaft, a limit sleeve, a spring and a guide key, the upper end of the main shaft is provided with a sliding cavity extending in the length direction of the main shaft, the lower end of the telescopic shaft is inserted into the sliding cavity and slidably cooperates with the main shaft, the upper end of the telescopic shaft is connected to the spline docking shaft through the adapter flange, the outer side of the telescopic shaft is provided with a limit convex ring, the spring is sleeved on the outer side of the telescopic shaft, and the upper end of the spring abuts the limit convex ring, and the lower end of the spring abuts the upper end of the main shaft, the limit sleeve is fixedly connected to the upper end of the main shaft and sleeved on the limit convex ring and the outer side of the spring, the guide key is installed on the outer side of the telescopic shaft, and the inner wall of the sliding cavity is provided with a sliding groove for accommodating the guide key to slide along the length direction of the main shaft; the spline drive assembly also includes a displacement sensor and a sensor bracket for detecting the telescopic state of the telescopic shaft, the sensor bracket is fixedly mounted on the substrate, and the displacement sensor is mounted on the sensor bracket.

[0010] Preferably, the displacement sensor is a proximity switch, a photoelectric switch or a mechanical travel switch.

[0011] Preferably, the key teeth are internal splines or external splines.

[0012] Preferably, the key teeth adopt internal splines arranged in the inner hole of the spline docking shaft, and the inner hole of the spline docking shaft is also provided with a guide bell mouth.

[0013] Preferably, the compensation platform includes a slide connecting plate, a platform plate, an XY compensator, and a compensator fixing plate. The slide connecting plate is slidably connected to the moving component, the platform plate is fixedly connected to the upper end of the slide connecting plate, the compensator fixing plate is installed on the platform plate, the XY compensator is installed on the compensator fixing plate, the upper end of the XY compensator is connected to the bottom surface of the substrate of the spline drive component, the compensator fixing plate and the platform plate are both provided with avoidance windows for the lower end of the spline drive component to pass through, and the working state of the XY compensator during the docking process between the spline docking shaft and the spline shaft of the motor is a floating state.

[0014] Preferably, the compensation platform further comprises an X adjustment block for adjusting the position of the compensator fixing plate in the X direction of the horizontal plane, and a Y adjustment block for adjusting the position of the compensator fixing plate in the Y direction of the horizontal plane; the compensator fixing plate is provided with a mounting countersunk hole, a U-groove gasket is provided in the mounting hole, and a screw passes through the U-groove gasket and the mounting countersunk hole to be fixedly connected to the platform plate; and an alignment pin is also provided on the base plate.

[0015] Preferably, the moving assembly includes a linear module, a base plate, a linear module fixing plate fixedly connected to the base plate, and a servo motor with a brake, wherein the servo motor with a brake drives the linear module to reciprocate to drive the compensation platform to move back and forth in a vertical direction.

[0016] Preferably, the linear module is a screw module or an electric cylinder.

[0017] On the other hand, the present invention provides a method for detecting the rotary angle of an automobile motor, which uses a spline fitting drive mechanism to achieve fitting with the spline shaft of the motor and drive the spline shaft of the motor to rotate. The spline fitting drive mechanism includes a spline drive component, a compensation platform and a moving component. The spline drive component includes a spline docking shaft for fitting with the spline shaft of the motor, the compensation platform includes an XY compensator, and the moving component includes a linear module. The method for detecting the rotary angle of an automobile motor includes the following steps:

[0018] The linear module lifts the spline drive assembly at a first speed so that the spline docking shaft approaches the motor spline shaft;

[0019] The XY compensator switches from the center locking state to the floating state, and the splined butt shaft continues to rise at the second speed, so that the motor splined shaft enters the guide bell mouth part of the splined butt shaft, and the splined butt shaft rotates at the first rotation speed;

[0020] The splined butt joint shaft continues to rise at the third speed, while the splined butt joint shaft keeps rotating at the first rotation speed, so that the splined shaft of the motor meshes with the key teeth of the splined butt joint shaft;

[0021] The XY compensator switches from a floating state to an eccentric locking state, while the splined butt shaft keeps rotating at a first rotation speed;

[0022] The rotation speed of the splined shaft is accelerated to the speed required for the test, and the automobile motor rotation angle detection begins.

[0023] The beneficial technical effect of the present invention is that the above-mentioned spline fitting drive mechanism includes a spline drive component, a compensation platform and a moving component. The compensation platform can adjust the position of the spline drive component in the XY direction of the horizontal plane, and compensate for the positioning error caused by the indirect positioning between the workstation and the product through the pallet, thereby ensuring that the spline drive component can be successfully docked with the spline shaft of the motor, solving the technical problem that the existing spline fitting drive mechanism is not suitable for the working conditions of indirect positioning between the motor and the workstation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the spline fitting drive mechanism of the present invention;

[0025] Figure 2 It is a schematic diagram of the exploded structure of the spline fitting drive mechanism of the present invention;

[0026] Figure 3 It is a structural schematic diagram of the spline drive assembly of the present invention;

[0027] Figure 4 It is a structural schematic diagram of the main shaft assembly of the present invention;

[0028] Figure 5 It is a structural schematic diagram of the main shaft of the present invention;

[0029] Figure 6 It is a structural schematic diagram of the compensation platform of the present invention;

[0030] Figure 7 A top view of the compensation platform of the present invention;

[0031] Figure 8 It is a schematic diagram of the structure of the mobile component of the present invention.

[0032] Description of reference numerals:

[0033] 100-spline drive assembly; 101-servo motor; 102-motor fixing plate; 103-coupling; 104-motor support column; 105-base plate; 106-displacement sensor; 107-sensor bracket; 108-alignment pin; 110-spindle assembly; 111-spline docking shaft; 112-spindle; 1121-slide cavity; 1122-slide groove; 113-bearing assembly; 114-adapter flange; 115-telescopic shaft; 1151-limiting convex ring; 116-limiting sleeve; 117-spring; 118-guide key; 119-guide bell mouth ;120-key teeth;200-compensation platform;201-slide connecting plate;202-platform plate;203-XY compensator;204-compensator fixing plate;205-X adjustment block;206-Y adjustment block;207-U groove gasket;208-reinforcement plate;209-amplifier bracket;210-sensor amplifier;211-drag chain bracket;300-moving component;301-bottom plate;302-linear module fixing plate;303-linear module;304-servo motor with brake;305-reinforcement ribs;306-drag chain;307-drag chain pallet. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to more clearly understand the objectives, technical solutions and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0035] The invention provides a spline fitting drive mechanism.

[0036] like Figure 1-2 As shown, in one embodiment of the present invention, the spline fitting drive mechanism includes a spline drive assembly 100, a compensation platform 200 and a moving assembly 300. The spline drive assembly 100 is used to fit with the motor spline shaft and drive the motor spline shaft to rotate; the compensation platform 200 is used to adjust the position of the spline drive assembly 100 in the horizontal plane XY direction to ensure that the spline drive assembly 100 can be successfully docked with the motor spline shaft; the moving assembly 300 is used to drive the compensation platform 200 to move back and forth in the vertical direction to make the spline drive assembly 100 away from or close to the motor spline shaft.

[0037] The spline fitting drive mechanism in this embodiment includes a spline drive component 100, a compensation platform 200 and a moving component 300. The compensation platform 200 can adjust the position of the spline drive component 100 in the horizontal plane XY direction, and compensate for the positioning error caused by the indirect positioning between the workstation and the product through the pallet, thereby ensuring that the spline drive component can be successfully docked with the spline shaft of the motor, solving the technical problem that the existing spline fitting drive mechanism is not suitable for the working conditions of indirect positioning between the motor and the workstation.

[0038] like Figure 3-5 As shown, the spline drive assembly 100 includes a servo motor 101, a motor fixing plate 102, a coupling 103, a motor support column 104, a base plate 105 and a spindle assembly 110, wherein the base plate 105 is floatingly connected to the compensation platform 200, the motor fixing plate 102 is installed below the base plate 105 through the motor support column 104, the servo motor 101 is fixedly installed on the motor fixing plate 102, the spindle assembly 110 includes a spline docking shaft 111, a spindle 112 and a bearing assembly 113 sleeved on the outside of the spindle 112, the spline docking shaft 111 is provided with key teeth 120 fitting with the spline shaft of the motor, the bearing assembly 113 is embedded in the base plate 105, the upper end of the spindle 112 is connected to the spline docking shaft 111, and the lower end of the spindle 112 is connected to the output shaft of the servo motor 101 through the coupling 103.

[0039] Refer again Figure 4 The key teeth 120 adopt an internal spline set in the inner hole of the spline docking shaft 111, which is used to fit the motor spline shaft and transmit torque through the key teeth 120. The inner hole of the spline docking shaft 111 is also provided with a guide bell mouth 119 for docking guidance, so that the center of the spline docking shaft 111 can automatically align with the center of the motor spline shaft to achieve an automatic centering function. In other embodiments, in order to adapt to the motor spline shaft, the key teeth 120 can also adopt an external spline set on the outside of the spline docking shaft 111.

[0040] Refer again Figure 3-5The spindle assembly 110 also includes an adapter flange 114, a telescopic shaft 115, a limit sleeve 116, a spring 117 and a guide key 118. The upper end of the spindle 112 is provided with a sliding cavity 1121 extending along the length direction of the spindle 112. The lower end of the telescopic shaft 115 is inserted into the sliding cavity 1121 and slides with the spindle 112. The upper end of the telescopic shaft 115 is connected to the spline docking shaft 111 through the adapter flange 114. A limit convex ring 1151 is provided on the outer side of the telescopic shaft 115. The spring 117 is sleeved on the outer side of the telescopic shaft 115, and the upper end of the spring 117 abuts against the limit convex ring 1151. The spring The lower end of 117 abuts against the upper end of the main shaft 112, the limit sleeve 116 is fixedly connected to the upper end of the main shaft 112 and is sleeved on the outside of the limit convex ring 1151 and the spring 117, the guide key 118 is installed on the outside of the telescopic shaft 115 for transmitting torque, and the inner wall of the sliding cavity 1121 is provided with a sliding groove 1122 for accommodating the guide key 118 to slide along the length direction of the main shaft 112; the spline drive assembly 100 also includes a displacement sensor 106 and a sensor bracket 107, the sensor bracket 107 is fixedly installed on the substrate 105, and the displacement sensor 106 is installed on the sensor bracket 107.

[0041] The displacement sensor 106 can be a sensor device such as a proximity switch, a photoelectric switch or a mechanical travel switch, which is used to detect the telescopic state of the telescopic shaft 115, and then determine whether the spline docking is successful or failed. When the spline docking fails, the spline docking shaft 111, the adapter flange 114 and the telescopic shaft 115 will retract downward. At this time, the displacement sensor 106 triggers an alarm signal, and the moving assembly 300 will move downward to make the spline docking shaft 111 away from the motor. When the telescopic shaft 115 retracts, the spring 117 plays a buffering role, and the telescopic shaft 117 and the main shaft 112 are in a sliding fit.

[0042] like Figure 6-7 As shown, the compensation platform 200 includes a slide connecting plate 201, a platform plate 202, an XY compensator 203, and a compensator fixing plate 204. The slide connecting plate 201 is slidably connected to the moving component 300, the platform plate 202 is fixedly connected to the upper end of the slide connecting plate 201, the compensator fixing plate 204 is installed on the platform plate 202, the XY compensator 203 is installed on the compensator fixing plate 204, the upper end of the XY compensator 203 is connected to the bottom surface of the substrate 105 of the spline drive component 100, and the compensator fixing plate 204 and the platform plate 202 are both provided with avoidance windows for the lower end of the spline drive component 100 to pass through.

[0043] The XY compensator 203 is a pneumatic component with three working states, namely, center locking, floating and eccentric locking, which can be controlled by a three-position five-way center drain valve. Initially, the XY compensator 203 is in the center locking state. During the spline docking process, the XY compensator 203 is floating. After the docking is completed, the XY compensator 203 switches to the eccentric locking state. Specifically, the XY compensator 203 is provided with two interfaces, namely, interface A and interface B; interface A is ventilated, and the XY compensator 203 is center locked; neither interface is ventilated, and the XY compensator 203 floats; interface B is ventilated, and the XY compensator 203 is eccentrically locked.

[0044] In an embodiment of the present invention, the compensation platform 200 applies an XY compensator 203. The working state of the XY compensator 203 during the docking process of the spline docking shaft and the motor spline shaft is a floating state. The positioning error caused by the indirect positioning between the workstation and the product through the pallet can be compensated, thereby ensuring the coaxiality between the spline docking shaft 111 and the motor spline shaft, ensuring that the spline drive assembly can be successfully docked with the motor spline shaft, and solving the technical problem that the existing spline fitting drive mechanism is not suitable for the working condition of indirect positioning between the motor and the workstation.

[0045] Refer again Figure 3 , Figure 7 The compensation platform 200 also includes an X adjustment block 205 for adjusting the position of the compensator fixing plate 204 in the X direction of the horizontal plane, and a Y adjustment block 206 for adjusting the position of the compensator fixing plate 204 in the Y direction of the horizontal plane; the compensator fixing plate 204 is provided with a mounting countersunk hole, and a U-groove gasket 207 is provided in the mounting hole. The screw passes through the U-groove gasket 207 and the mounting countersunk hole to be fixedly connected with the platform plate 202; the base plate 105 is also provided with a positioning pin 108.

[0046] The X adjustment block 205, the Y adjustment block 206 and the U-groove gasket 207 are used in conjunction with the alignment pin 108 on the spline drive assembly 100 to calibrate the center position of the spline docking shaft 111. Based on the design concept of convenient adjustment, there will be a position calibration tool for calibrating the center position of the spline docking shaft. Specifically, first loosen the screws on the U-groove gasket 207, adjust the screws on the Y adjustment block 206 and the X adjustment block 205 until the alignment pin 108 matches the bushing on the position calibration tool, and then tighten the screws on the U-groove gasket 207 to complete the center position calibration of the spline docking shaft 111.

[0047] Refer again Figure 6A reinforcing plate 208 is connected to each side of the slide connecting plate 201, and the top of the reinforcing plate 208 is connected to the bottom surface of the platform plate 202 to enhance the firmness of the connection between the slide connecting plate 201 and the platform plate 202. An amplifier bracket 209 is installed on the platform plate 202, and a sensor amplifier 210 for amplifying the sensing signal of the displacement sensor 106 is installed on the amplifier bracket 209.

[0048] like Figure 8 As shown, the moving assembly 300 includes a linear module 303, a base plate 301, a linear module fixing plate 302 fixedly connected to the base plate 301, and a servo motor with brake 304. The base plate 301 is fixed to the equipment frame with screws to fix the entire spline fitting drive mechanism. The linear module 303 is a lead screw module or an electric cylinder, etc. The servo motor with brake 304 drives the linear module 303 to reciprocate to drive the compensation platform 200 to move back and forth in the vertical direction.

[0049] Refer again Figure 6 , Figure 8 The moving component 300 also includes a drag chain 306, a drag chain support plate 307, and a reinforcing rib 305. A drag chain bracket 211 is installed on the reinforcing plate 208. The drag chain support plate 307 is fixedly installed on the base plate 301. One end of the drag chain 306 is connected to the drag chain support plate 307, and the other end of the drag chain 306 is connected to the drag chain bracket 211. The reinforcing rib 305 is fixedly connected to the base plate 301 and the linear module fixed plate 302 respectively to enhance the firmness of the connection between the base plate 301 and the linear module fixed plate 302.

[0050] Based on the above-mentioned spline fitting drive mechanism, the present invention also provides a method for detecting the rotation angle of an automobile motor, comprising the following steps:

[0051] Step 1: The linear module lifts the spline drive assembly at a first speed (such as 50 mm / s) so that the spline docking shaft approaches the motor spline shaft;

[0052] Step 2: The XY compensator is switched from the center locking state to the floating state; the splined butt shaft continues to rise at the second speed (such as 30 mm / s), so that the motor splined shaft enters the guide bell mouth part of the splined butt shaft, and the splined butt shaft rotates at the first rotation speed (such as 15 r / min);

[0053] Step 3: The splined butt joint shaft continues to rise at the third speed (such as 10 mm / s), and the splined butt joint shaft keeps rotating at the first rotation speed (such as 15 r / min), so that the spline shaft of the motor is meshed with the key teeth of the splined butt joint shaft;

[0054] Step 4: The XY compensator switches from a floating state to an eccentric locking state; at the same time, the splined butt shaft keeps rotating at the first rotation speed (such as 15 r / min);

[0055] Step 5: The splined shaft is accelerated to the speed required for the test (such as 760r / min), and the automobile motor rotation angle detection is started.

[0056] The automobile motor rotation angle detection method of this embodiment uses a spline fitting drive mechanism to achieve fitting with the motor spline shaft and drive the motor spline shaft to rotate. The spline fitting drive mechanism includes a spline drive component, a compensation platform and a moving component. The compensation platform can adjust the position of the spline drive component in the horizontal plane XY direction, and compensate for the positioning error caused by the indirect positioning between the workstation and the product through the pallet, thereby ensuring that the spline drive component can be successfully docked with the motor spline shaft, solving the technical problem that the existing spline fitting drive mechanism is not suitable for the working condition of indirect positioning between the motor and the workstation, and ensuring the normal detection of the automobile motor rotation angle.

[0057] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Those skilled in the art can make various equivalent changes and improvements based on the above embodiments, and all equivalent changes or modifications made within the scope of the claims should fall within the protection scope of the present invention.

Claims

1. A spline fitting drive mechanism, characterized in that: include: A spline drive assembly, used for fitting with the spline shaft of the motor and driving the spline shaft of the motor to rotate; The compensation platform is used to adjust the position of the spline drive assembly in the XY direction of the horizontal plane to ensure that the spline drive assembly can be successfully docked with the motor spline shaft; The moving assembly is used for driving the compensation platform to move back and forth in the vertical direction so as to make the spline driving assembly move away from or close to the spline shaft of the motor.

2. The spline fitting drive mechanism according to claim 1, characterized in that: The spline drive assembly includes a servo motor, a motor fixing plate, a coupling, a motor support column, a base plate and a spindle assembly. The base plate is floatingly connected to the compensation platform. The motor fixing plate is installed under the base plate through the motor support column. The servo motor is fixedly installed on the motor fixing plate. The spindle assembly includes a spline docking shaft, a spindle and a bearing assembly sleeved on the outside of the spindle. The spline docking shaft is provided with key teeth that fit the spline shaft of the motor. The bearing assembly is embedded in the base plate. The upper end of the spindle is connected to the spline docking shaft, and the lower end of the spindle is connected to the output shaft of the servo motor through the coupling.

3. The spline fitting drive mechanism according to claim 2, characterized in that: The spindle assembly also includes an adapter flange, a telescopic shaft, a limit sleeve, a spring and a guide key, the upper end of the spindle is provided with a sliding cavity extending along the length direction of the spindle, the lower end of the telescopic shaft is inserted into the sliding cavity and slidably cooperates with the spindle, the upper end of the telescopic shaft is connected to the spline docking shaft through the adapter flange, the outer side of the telescopic shaft is provided with a limit convex ring, the spring is sleeved on the outer side of the telescopic shaft, and the upper end of the spring abuts the limit convex ring, and the lower end of the spring abuts the upper end of the spindle, the limit sleeve is fixedly connected to the upper end of the spindle and sleeved on the limit convex ring and the outer side of the spring, the guide key is installed on the outer side of the telescopic shaft, and the inner wall of the sliding cavity is provided with a sliding groove for accommodating the guide key to slide along the length direction of the spindle; the spline drive assembly also includes a displacement sensor and a sensor bracket for detecting the telescopic state of the telescopic shaft, the sensor bracket is fixedly mounted on the substrate, and the displacement sensor is mounted on the sensor bracket.

4. The spline fitting drive mechanism according to claim 3, characterized in that: The displacement sensor adopts a proximity switch, a photoelectric switch or a mechanical travel switch.

5. The spline fitting drive mechanism according to any one of claims 2 to 4, characterized in that: The key teeth adopt internal splines or external splines.

6. The spline fitting drive mechanism according to any one of claims 2 to 4, characterized in that: The key teeth adopt an internal spline arranged in the inner hole of the spline docking shaft, and the inner hole of the spline docking shaft is also provided with a guide bell mouth.

7. The spline fitting drive mechanism according to claim 2, characterized in that: The compensation platform includes a slide connecting plate, a platform plate, an XY compensator, and a compensator fixing plate. The slide connecting plate is slidably connected to the moving component, the platform plate is fixedly connected to the upper end of the slide connecting plate, the compensator fixing plate is installed on the platform plate, the XY compensator is installed on the compensator fixing plate, the upper end of the XY compensator is connected to the bottom surface of the substrate of the spline drive component, the compensator fixing plate and the platform plate are both provided with avoidance windows for the lower end of the spline drive component to pass through, and the working state of the XY compensator during the docking process between the spline docking shaft and the spline shaft of the motor is a floating state.

8. The spline fitting drive mechanism according to claim 7, characterized in that: The compensation platform also includes an X adjustment block for adjusting the position of the compensator fixing plate in the X direction of the horizontal plane, and a Y adjustment block for adjusting the position of the compensator fixing plate in the Y direction of the horizontal plane; the compensator fixing plate is provided with a mounting countersunk hole, a U-groove gasket is provided in the mounting hole, and a screw passes through the U-groove gasket and the mounting countersunk hole to be fixedly connected with the platform plate; and an alignment pin is also provided on the base plate.

9. The spline fitting drive mechanism according to claim 2, characterized in that: The moving assembly includes a linear module, a base plate, a linear module fixing plate fixedly connected to the base plate, and a servo motor with a brake. The servo motor with a brake drives the linear module to reciprocate to drive the compensation platform to move back and forth in a vertical direction.

10. A method for detecting the rotary angle of an automobile motor, characterized in that: A spline fitting drive mechanism is used to achieve fitting with the motor spline shaft and drive the motor spline shaft to rotate. The spline fitting drive mechanism includes a spline drive component, a compensation platform and a moving component. The spline drive component includes a spline docking shaft for fitting with the motor spline shaft. The compensation platform includes an XY compensator. The moving component includes a linear module. The automobile motor rotation angle detection method includes the following steps: The linear module lifts the spline drive assembly at a first speed so that the spline docking shaft approaches the motor spline shaft; The XY compensator switches from the center locking state to the floating state, and the splined butt shaft continues to rise at the second speed, so that the motor splined shaft enters the guide bell mouth part of the splined butt shaft, and the splined butt shaft rotates at the first rotation speed; The splined butt joint shaft continues to rise at the third speed, while the splined butt joint shaft keeps rotating at the first rotation speed, so that the splined shaft of the motor meshes with the key teeth of the splined butt joint shaft; The XY compensator switches from a floating state to an eccentric locking state, while the splined butt shaft keeps rotating at a first rotation speed; The rotation speed of the splined shaft is accelerated to the speed required for the test, and the automobile motor rotation angle detection begins.

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