Press fitting device for assembling motor assembly and machining method

Abstract

The invention discloses a press fitting device for assembling a motor assembly, which comprises an upper pressing assembly arranged at the non-output shaft end of a rotor, the upper pressing assembly comprises a floating part and a vertical sliding table, the floating part is in contact with the non-output shaft end, an elastic structure is formed between the floating part and the vertical sliding table, and the floating part is in contact with the vertical sliding table. And the motion trails of the floating piece and the vertical sliding table are parallel to the axis of the rotor. Through the vertical sliding table and the floating piece which are in sliding connection, the vertical sliding table can drive the floating piece to press the rotor and the lower tip piece, when the end face of the output shaft end coincides with the end face of the input end, the floating piece and the upper tip piece are fixed relative to the gearbox, and the vertical sliding table slides down along the floating piece, so that the elastic force borne by the floating piece is transmitted to the rotor; secondly, the angle of the external spline relative to the internal spline is rotated through the rotating shaft, so that the two end faces are not overlapped any more, the rotor moves downwards instantly, and then it is known that the internal spline is embedded into the external spline, and the rotor continues to approach the gearbox until the motor assembly is assembled.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a press-fitting device and a processing method for assembling a motor assembly. Background Art

[0002] The motor assembly in new energy vehicles is complex and sophisticated, mainly including: stator, rotor, motor housing, front cover and rear cover, gearbox, resolver assembly and cooling system. The rotor transmits the rotational motion and torque to the stator through the output shaft with splines on the side of the shaft end, and then to the input end of the gearbox, thereby driving the vehicle. The rotor is connected to the gearbox through splines. The assembly process of the rotor, stator and gearbox is as follows: a. Preparation stage: the rotor and stator are placed in their respective assembly positions for preliminary positioning and fixing; b. Positioning stage: the lower center rises, accurately positions the stator, and the rotor moves to the top of the stator assembly position; c. Pressing stage: the upper center descends, and cooperates with the lower center to press the rotor into the stator; d. Pressing again: the pressing equipment presses the rotor and stator assembly down to the preset pressing position, and the pressing is completed; e. Inspection stage: the rotor and stator are subjected to magnetic flux detection, appearance inspection, etc., and the press-fitting quality of the rotor and stator is detected using measuring tools and other tools, including press-fitting depth, parallelism, verticality, etc.

[0003] The inventors of the present application discovered during the process of assembling the motor assembly that when the output shaft with splines formed on the side of the rotor's axial end is press-fitted into the input end of the gearbox, it is necessary to manually adjust the spline angles between the output shaft and the input end, and to constantly adjust during the assembly process to ensure that the internal splines of the output shaft can just fit into the external splines of the input end. This press-fitting method is not only time-consuming and labor-intensive, but also when the output shaft and the input end are about to approach, it is impossible to manually observe them and they can only be assembled by feel, which can easily cause damage to the splines, thereby affecting the transmission effect of the output shaft, and further affecting the transmission efficiency of the motor assembly. Summary of the invention

[0004] The present invention solves the problem that the internal splines of the rotor and the external splines of the gearbox are not easy to assemble during the assembly of the motor assembly, and provides a press-fitting device and a processing method for assembling the motor assembly. The specific technical scheme is as follows:

[0005] A press-fitting device for assembling a motor assembly comprises: an upper pressing component arranged at one end of the non-output shaft of the rotor, the upper pressing component comprises a floating member and a vertical slide, the floating member contacts one end of the non-output shaft, an elastic structure is formed between the floating member and the vertical slide, and the movement trajectories of the floating member and the vertical slide are parallel to the axis of the rotor; when the end face of the output shaft end is not in contact with the end face of the input end, the vertical slide drives the floating member and the rotor to move vertically; when the end face of the output shaft end is in contact with the end face of the input end, the floating member, the rotor and the gearbox remain stationary, and the vertical slide moves relative to the floating member in a direction away from the rotor.

[0006] Furthermore, the upper pressure assembly includes: an upper top member coinciding with the axis of the rotor, the upper top member being arranged on the floating member, the floating member driving the upper top member to move, the upper top member applying pressure to the end surface of the non-output shaft end of the rotor; and the vertical slide being slidably connected to the floating member, when the vertical slide moves relative to the floating member, the vertical slide applies pressure directed to the rotor to the floating member through an elastic structure, and the vertical slide can limit the position of the floating member relative to the vertical slide.

[0007] Preferably, it also includes a lower top assembly, which includes a lower top member, and the lower top member includes a lower top and a lower top lifting member, the lower top is in contact with the end face of the output shaft end of the rotor, and the axis of the lower top coincides with the axis of the rotor, and the lower top lifting member can drive the lower top to apply pressure to the end face of the output shaft end of the rotor to maintain the force balance of the rotor.

[0008] Preferably, it also includes a shaft assembly, which includes a shaft, and the rotation of the shaft can drive the external spline of the input end of the gearbox to rotate relative to the internal spline of the output shaft of the rotor. When the angles of the internal spline and the external spline match, the elastic force generated by the elastic structure of the vertical slide can push the floating part away from the vertical slide, thereby pushing the output shaft end of the rotor into the input end of the gearbox.

[0009] Preferably, the vertical slide includes: a movable bracket slidably connected to the floating member, the movable bracket moves along the vertical direction; a first cylinder connected to the movable bracket, the first cylinder pushes the movable bracket to move; a second cylinder arranged between the bottom surface of the movable bracket and the floating member, the second cylinder forms the elastic structure; and a clamping rod arranged between the movable bracket and the floating member, the clamping rod can limit the minimum distance between the movable bracket and the floating member.

[0010] Preferably, the floating part includes: a floating plate provided with the upper top part, the floating plate is perpendicular to the movement direction of the upper top part; a guide shaft fixedly connected to the floating plate at one end, the other end of the guide shaft is slidably connected to the vertical slide, and the vertical slide can limit one end of the guide shaft; and a mechanical gripper arranged on a side of the floating plate away from the vertical slide, the mechanical gripper forms a structure capable of limiting.

[0011] Preferably, the upper tip member includes an upper tip cylinder arranged on the floating member, the telescopic end of the upper tip cylinder is provided with an upper tip, the upper tip is coaxial with the rotor, the upper tip is in contact with the end surface of the non-output shaft end of the rotor, and the upper tip cylinder can push the upper tip to apply pressure to the non-output shaft end of the rotor.

[0012] Preferably, the rotating shaft assembly also includes: a groove formed at one end of the rotating shaft close to the upper top piece, which can cause the movement state of the upper top piece relative to the vertical slide to change during rotation; a lifting cylinder connected to the telescopic end of the rotating shaft and the other end of the rotating shaft, and the lifting cylinder drives the rotating shaft to move in the same direction as the movement direction of the lower top piece; and a support ring connected to the axial side of the rotating shaft through a slide key, the support ring can drive the rotating shaft to rotate, and the length direction of the slide key is parallel to the axis of the rotating shaft.

[0013] A method for processing a press-fit motor assembly by a press-fit device comprises the following steps:

[0014] S1: The mechanical gripper fixes the rotor on the floating part, so that the upper and lower top parts apply pressure to the midpoints of the two end surfaces of the rotor respectively;

[0015] S2: The vertical slide drives the floating part, the upper top part, and the lower top part to move vertically downward until the end face of the output shaft contacts the end face of the input end, and the vertical slide continues to move downward L, so that the upper top part moves upward L relative to the vertical slide;

[0016] S3: The rotation of the shaft drives the external spline of the input end to rotate around its axis, so that the internal spline of the output shaft is just embedded in the external spline of the input end, and the upper center piece moves downward L relative to the vertical slide, and the range of L is between 3-7mm;

[0017] S4: The vertical slide continues to drive the floating part, the upper center part, and the lower center part to move downward until the motor assembly is pressed and installed.

[0018] It can be seen from the above technical solution that the present invention has the following beneficial effects:

[0019] The present invention provides a vertical slide and a floating part that are slidably connected, so that the vertical slide can not only drive the floating part and the upper top part to press down the rotor and the lower top part, but also when the bottom end face of the output shaft of the rotor coincides with the top end face of the input end of the gearbox, the floating part and the upper top part remain stationary relative to the gearbox, and the vertical slide continues to slide down along the floating part until it is fixed, so that the bottom end face of the output shaft of the rotor applies a downward pressure to the top end face of the input end of the gearbox, and secondly, the angle of the external spline of the input end of the gearbox is rotated by the rotating shaft relative to the internal spline of the output shaft of the rotor, so that the two end faces no longer coincide, and the rotor is quickly moved downward relative to the vertical slide under the action of the downward pressure, and the operator can know that the internal spline has been embedded in the external spline, so that the rotor continues to approach the gearbox until the motor assembly is completed, thereby avoiding the loss of the spline, improving the assembly quality, and improving the assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural diagram of Embodiment 1 of the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of an upper pressure assembly according to an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of a top assembly according to an embodiment of the present invention;

[0023] Figure 4 Schematic diagram of the structure of a rotating shaft assembly according to an embodiment of the present invention.

[0024] Figure 5 It is a side view of an upper pressing assembly according to an embodiment of the present invention.

[0025] In the figure: 1. upper pressure assembly; 2. lower top assembly; 3. rotating shaft assembly; 4. motor assembly; 11. vertical slide; 111. movable bracket; 112. first cylinder; 113. second cylinder; 114. clamping rod; 12. floating member; 121. floating plate; 122. guide shaft; 123. mechanical gripper; 13. upper top member; 131. upper top cylinder; 132. upper top; 22. lower top member; 221. lower top; 222. lower top lifting member; 31. rotating shaft; 311. groove; 312. support ring; 34. lifting cylinder. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the embodiments of the present invention, it should be noted that the terms "inside", "outside", "upper", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 a limitation on the present invention.

[0028] Embodiment 1

[0029] It is known from common knowledge that the motor assembly 4 includes a rotor and a gearbox. The output shaft side of the rotor is formed with an internal spline, and the inner surface of the input end of the gearbox is formed with an external spline. The press-fitting device is used to press the internal spline vertically downward into the external spline.

[0030] like Figure 1 As shown, this embodiment includes an upper pressure assembly 1 arranged at one end of the non-output shaft of the rotor, and the upper pressure assembly 1 includes a floating member 12 and a vertical slide 11. The floating member 12 is in contact with one end of the non-output shaft, and an elastic structure is formed between the floating member 12 and the vertical slide 11. The movement trajectories of the floating member 12 and the vertical slide 11 are parallel to the axis of the rotor; and when the end face of the output shaft end is not in contact with the end face of the input end, the vertical slide 11 drives the floating member 12 and the rotor to move vertically; when the end face of the output shaft end is in contact with the end face of the input end, the floating member 12, the rotor and the gearbox remain stationary, and the vertical slide 11 moves relative to the floating member 12 in a direction away from the rotor.

[0031] Specifically, the rotor is fixed to a side of the floating member 12 away from the vertical slide 11. The weight of the floating member 12 and the rotor ensures that when the vertical slide 11 drives the floating member 12 to move vertically downward, the elastic structure between the floating member 12 and the vertical slide 11 will not be compressed, so that when the vertical slide 11 moves vertically downward, it can drive the floating member 12 and the rotor to move vertically downward together until the end face of the output shaft end contacts the end face of the input end, and the internal spline is not embedded in the external spline. The end face of the input end provides support for the floating member 12 and the rotor, so that when the vertical slide 11 continues to move downward, the elastic structure It will be compressed, and then the floating part 12 is subjected to the elastic force directed to the input end. When the outer spline rotates relative to the inner spline until the inner spline is embedded in the outer spline, the elastic force will push the floating part 12 and the rotor to move downward instantly until the elastic structure returns to its original position. At this time, the sensor detects that the elastic structure is first compressed and then stretched, so it can be judged that the inner spline of the rotor has been embedded in the outer spline of the gearbox, and then the vertical slide 11 can drive the floating part 12 and the rotor to continue to move downward until the motor assembly 4 is assembled, thereby converting the difference in the angles of the inner spline and the outer spline into a state of the elastic structure, thereby improving the efficiency of assembly.

[0032] like Figure 2As shown, the upper pressure assembly 1 includes: an upper top member 13 that coincides with the axis of the rotor, and the upper top member 13 applies pressure to the end face of the non-output shaft end of the rotor; the movement trajectory of the floating member 12 is the same as the movement trajectory of the upper top member 13; and the vertical slide 11 is slidingly connected to the floating member 12. When the vertical slide 11 moves relative to the floating member 12, the vertical slide 11 applies pressure directed to the rotor to the floating member 12 through the elastic structure, and the vertical slide 11 can limit the position of the floating member 12 relative to the vertical slide 11.

[0033] Specifically, the upper top piece 13 is fixed to the floating piece 12 by bolt connection, and when the vertical slide 11 drives the floating piece 12 to move vertically downward, it can also drive the upper top piece 13 to move vertically downward, so that the upper top piece 13 can apply pressure pointing to the gearbox to the end face of the non-output shaft end of the rotor, so that the axis of the rotor can remain stable relative to the floating piece 12, so that the axis of the rotor always coincides with the axis of the input end during the movement, thereby improving the assembly accuracy; secondly, when the end face of the output shaft end contacts the end face of the input end, and the internal spline is not embedded in the external spline, the end face of the input end provides support for the floating piece 12 and the rotor When the force is held, the vertical slide 11 continues to move downward, so that it moves vertically downward along the slide rail relative to the floating part 12, thereby compressing the elastic structure between the two. However, the floating part 12 is formed with an upper and lower limit structure, so that the vertical slide 11 has a minimum distance and a maximum distance relative to the floating part 12. The floating part 12 is subjected to the elastic force directed to the gearbox, so that the floating part 12 can instantly push the rotor to embed into the gearbox when the inner spline is embedded in the outer spline, thereby making the vertical slide 11 vertically upward again relative to the floating part 12, so that the sensor that detects the signal continues to control the vertical slide 11 to drive the floating part 12 and the rotor to move downward.

[0034] like Figure 3 As shown, the present embodiment also includes a lower top assembly 2, which includes a lower top member 22, and the lower top member 22 includes a lower top 221 and a lower top lifting member 222. The lower top 221 is in contact with the end face of the output shaft end of the rotor, and the axis of the lower top 221 coincides with the axis of the rotor. The lower top lifting member 222 can drive the lower top 221 to apply pressure to the end face of the output shaft end of the rotor to maintain the force balance of the rotor.

[0035] Specifically, the lower tip 221 can press against the midpoint of the end face of the output shaft of the rotor when pushed upward by the lower lifting member, so that the upward force exerted by the lower tip 221 on the rotor can balance the force exerted on the rotor in the direction of its axis, thereby enabling the rotor to keep its axis always coincident with the axis of the gearbox when pressed by the upper tip 132 and the lower tip 221.

[0036] Among them, the structure of the lower lifting member in Example 1 is a rodless cylinder driving a driving plate and then driving the lower top 221 to move up and down. It can also be a servo electric cylinder driving the lower top 221 to move up and down, thereby improving the movement accuracy of the lower top 221.

[0037] like Figure 4 As shown, embodiment 1 also includes a shaft assembly 3, which includes a shaft 31. The rotation of the shaft 31 can drive the external spline of the input end of the gearbox to rotate relative to the internal spline of the output shaft of the rotor. When the angles of the internal spline and the external spline match, the elastic force generated by the elastic structure of the vertical slide 11 can push the floating member 12 away from the vertical slide 11, and then push the output shaft end of the rotor into the input end of the gearbox.

[0038] Specifically, the axis of the rotating shaft 31 is parallel to the axis of the upper top piece 13. The rotating shaft 31 can drive the input end of the gearbox to rotate during the rotation process, and then drive its external spline to rotate relative to the internal spline of the rotor, so that the output shaft can be embedded in the input end at a certain moment, causing the upper top piece 13 to fall, and then move downward relative to the vertical slide 11. Therefore, the operator only needs to rotate the rotating shaft 31 and observe the movement state of the upper top piece 13 relative to the vertical slide 11 to determine whether the output shaft is embedded in the input end, thereby improving the accuracy of the assembly process, avoiding damage to the spline during collision, and improving the quality and efficiency of assembly.

[0039] Furthermore, the rotating shaft assembly 3 also includes: a groove 311 formed at one end of the rotating shaft 31 close to the upper top piece 13, and the rotation of the groove 311 can cause the movement state of the upper top piece 13 relative to the vertical slide 11 to change; a lifting cylinder 34 connected to the telescopic end and the other end of the rotating shaft 31, and the lifting cylinder 34 drives the movement direction of the rotating shaft 31 to be the same as the movement direction of the lower top piece 22; and a support ring 312 connected to the axial side of the rotating shaft 31 through a slide groove key, and the support ring 312 can drive the rotating shaft 31 to rotate, and the length direction of the slide groove key is parallel to the axis of the rotating shaft 31.

[0040] Specifically, the axis of the groove 311 is perpendicular to and intersects with the axis of the rotating shaft 31, and the groove 311 can be embedded in the output end of the gearbox, so that when the rotating shaft 31 drives the groove 311 to rotate, the groove 311 can drive the output end of the gearbox to rotate, and then drive the input end of the gearbox to rotate through the gear transmission inside the gearbox, so that the external spline of the input end rotates relative to the internal spline of the rotor, and the internal spline of the rotor can be embedded in the external spline of the input end, so that the bottom end face of the rotor no longer contacts the end face of the input end of the gearbox, and the upper top piece 13 moves downward instantaneously relative to the vertical slide 11.

[0041] Secondly, the axonometric surface of the rotating shaft 31 and the inner surface of the support ring 312 are connected by a concave and convex slot key, and the telescopic end of the lifting cylinder 34 is connected to the lower end of the rotating shaft 31. Under the push of the lifting cylinder 34, the rotating shaft 31 can move vertically along the slot relative to the support ring 312, so that the groove 311 can change its relative position with the output end of the gearbox, so that the groove 311 can be better embedded in the output end; in addition, the servo motor drives the support ring 312 to rotate through the synchronous belt, and the support ring 312 drives the rotating shaft 31 to rotate through the slot key, so that the groove 311 can drive the output end to rotate, so that the rotor is embedded in the gearbox, so that the operator can continuously adjust the position relationship between the external spline of the input end of the gearbox and the internal spline of the rotor through the servo motor, thereby improving the assembly efficiency.

[0042] like Figure 5 As shown, the vertical slide 11 includes: a movable bracket 111 slidably connected to the floating member 12, and the movable bracket 111 moves along the vertical direction; a first cylinder 112 connected to the movable bracket 111, and the first cylinder 112 pushes the movable bracket 111 to move; a second cylinder 113 is arranged between the bottom surface of the movable bracket 111 and the floating member 12, and the second cylinder 113 forms an elastic structure; and a clamping rod 114 is arranged between the movable bracket 111 and the floating member 12, and the clamping rod 114 can limit the minimum distance between the movable bracket 111 and the floating member 12.

[0043] Specifically, the movable bracket 111 is formed with two perpendicular surfaces, and its side surface moves along the vertical guide rail under the push of the first cylinder 112, and its bottom surface is connected to the second cylinder 113 through a thread, and the second cylinder 113 can form a gas pressure buffer structure through a pressure regulating valve, thereby forming a buffer between the bottom surface of the movable bracket 111 and the floating member 12, and the elastic force of the second cylinder 113 can be adjusted by adjusting the air release speed of the pressure regulating valve, thereby adjusting the force between the floating member 12 and the movable bracket 111, so that the operator can The downward pressure F of the upper top piece 13 on the lower top piece 22 can be adjusted according to the different masses of the motor end cover and the rotor; secondly, the upper part of the clamping rod 114 whose axis is perpendicular to the bottom surface of the movable bracket 111 is fixedly connected to the bottom surface of the movable bracket 111, and its lower part is connected to the top surface of the floating piece 12, and there is a gap between the bottom surface of the upper part and the top surface of the lower part, so that the floating piece 12 is limited when it moves upward relative to the movable bracket 111, and then there is a minimum gap between the floating piece 12 and the movable bracket 111, and the gap is used to place the second cylinder 113.

[0044] Furthermore, the floating member 12 includes: a floating plate 121 provided with an upper top member 13, the floating plate 121 is perpendicular to the movement direction of the upper top member 13; a guide shaft 122 having one end fixedly connected to the floating plate 121, the other end of the guide shaft 122 being slidably connected to the vertical slide, and the vertical slide can limit one end of the guide shaft 122; and a mechanical gripper 123 arranged on a side of the floating plate 121 away from the vertical slide, the mechanical gripper 123 forming a structure capable of limiting.

[0045] Specifically, the floating plate 121 is perpendicular to the movement direction of the upper top piece 13 and parallel to the bottom surface of the mobile bracket 111, so that the movement direction of the upper top piece 13 set on the floating plate 121 is the same as the movement direction of the bottom surface of the mobile bracket 111, thereby making the movement tracks of the mobile bracket 111, the floating plate 121 and the upper top piece 13 coincide with each other; secondly, the lower ends of the four guide shafts 122 are connected to the floating plate 121 by bolts, and the other ends thereof are slidably connected to the bottom surface of the mobile bracket 111, and the top ends of the guide shafts 122 are all formed with limited position protrusions, so that when the top side surface of the guide shaft 122 slides along the mobile bracket 111, the top end will not be separated from the mobile bracket 111, thereby making the mobile bracket 111 11 can limit the position limit of the floating plate 121 relative to itself, and the position limit will not exceed the extension and contraction limit of the second cylinder 113, so that there is always an elastic structure between the bottom surface of the floating plate 121 and the movable bracket 111; secondly, the bottom surface of the floating plate 121 is connected to four mechanical grippers 123 by bolts, and the mechanical grippers 123 can fix the motor end cover and the floating plate 121 together when they are closed, and the midpoint of the top of the rotor coincides with the lower end vertex of the upper top piece 13, so that the rotor can be continuously pressed by the upper top piece 13, thereby maintaining its relative position with the floating plate 121, and thereby maintaining the axis of the rotor always coincident with the axis of the input end of the gearbox, thereby improving the success rate of assembly of the motor assembly 4.

[0046] Furthermore, the upper top member 13 includes an upper top cylinder 131 arranged on the floating member 12, and the telescopic end of the upper top cylinder 131 is provided with an upper top 132, and the upper top 132 is coaxial with the rotor, and the upper top 132 is in contact with the end surface of the non-output shaft end of the rotor. The upper top cylinder 131 can push the upper top 132 to apply pressure to the non-output shaft end of the rotor.

[0047] Specifically, the axis of the telescopic end of the upper top cylinder 131 coincides with the axis of the rotor, and its telescopic direction is the same as the downward movement direction of the movable bracket 111, so that the telescopic end of the upper top cylinder 131 pushes the upper top 132 downward to press against the midpoint of the rotor, so that the upper top cylinder 131 can adjust the force of the upper top 132 on the rotor by adjusting its own stroke in actual production.

[0048] Embodiment 2

[0049] The processing method of press-fitting the motor assembly 4 by the press-fitting device of the first embodiment comprises the following steps:

[0050] S1: The mechanical gripper 123 fixes the rotor on the floating member 12 so that point A and point B apply forces to the midpoints of the two end surfaces of the rotor respectively;

[0051] Specifically, the mechanical gripper 123 fixes the rotor to the bottom surface of the floating plate 121 by fixing the motor end cover, so that when the upper tip 132 applies force to the rotor through point A and the lower tip 221 applies force to the rotor through point B, the rotor will not be displaced, and the verticality of the axis of the rotor relative to the end face of the floating plate 121 and the input end of the gearbox is maintained under the action of points A and B.

[0052] S2: The vertical slide 11 drives the floating member 12, the upper top member 13, and the lower top member 22 to move vertically downward until the end face of the output shaft contacts the end face of the input end, and the vertical slide 11 continues to move downward L, so that the upper top member 13 moves upward L relative to the vertical slide 11;

[0053] Specifically, the vertical slide 11 drives the floating member 12 to move downward through the upper limit structure of the guide shaft 122. The floating member 12 is fixedly connected to the upper top member 13. The upper top member 13 pushes the lower top member 22 downward by pressing the rotor downward until the lower end face of the rotor contacts the top end face of the gearbox. At this time, the positions of the floating member 12, the upper top member 13 and the lower top member 22 are fixed, and the vertical slide 11 continues to move downward along the guide shaft 122 by L, where L is equal to the gap between the upper and lower parts of the clamping rod 114. The second cylinder 113 is compressed, so that the rotor is subjected to the elastic force applied to it by the second cylinder 113.

[0054] S3: The rotation of the rotating shaft 31 drives the external spline of the input end to rotate around its axis, so that the internal spline of the output shaft is just embedded in the external spline of the input end, and the upper center piece 13 moves downward L relative to the vertical slide 11;

[0055] Specifically, the rotating shaft 31 drives the outer spline to rotate relative to the inner spline until the angles of the inner spline and the outer spline are the same. At this time, the vertical slide 11 is fixed, and the rotor is quickly embedded in the input end of the gearbox under the push of the elastic force and the total weight of the upper top member 13 and the floating member 12 until the floating plate 121 remains relatively stationary with the vertical slide 11 through the upper limit structure of the guide shaft 122.

[0056] S4: The vertical slide 11 continues to drive the floating part 12, the upper top part 13, and the lower top part 22 to move downward until the motor assembly 4 is press-fitted.

[0057] Specifically, the rotor continues to be embedded in the gearbox until it reaches the position required for assembly. At this time, the vertical slide 11 continues to press down relative to the floating part 12 until the upper and lower parts of the clamping rod 114 overlap. The vertical slide 11 continues to press down the floating part 12 until the motor end cover and the stator are assembled, obtaining a motor assembly 4 that meets production requirements.

[0058] Furthermore, the range of L is between 3-7mm. When L is less than 3mm, the distance that the rotor moves downward instantly is too small, and the sensor cannot detect it accurately, thereby reducing the detection accuracy. When L is greater than 7mm, the movement distance of the vertical cylinder relative to the floating part 12 is too large, so that the elastic force on the floating part 12 is too large, and the acceleration of the rotor moving downward instantly is too large, which can easily cause damage to the mechanical gripper 123. Secondly, when there is still a slight angle difference between the inner spline and the outer spline, the excessive elastic force can directly push the inner spline into the outer spline, causing damage to the spline.

[0059] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0060] The techniques, shapes, and structural parts not described in detail in the present invention are all well-known techniques.

Claims

1. A press-fitting device for assembling a motor assembly, the motor assembly comprising a rotor and a gearbox, the output shaft side of the rotor is formed with an internal spline, the inner surface of the input end of the gearbox is formed with an external spline, the press-fitting device is used to press the internal spline vertically downward into the external spline, characterized in that: include: An upper pressure assembly (1) is arranged at one end of the non-output shaft of the rotor, the upper pressure assembly (1) comprising a floating member (12) and a vertical slide (11), the floating member (12) is in contact with one end of the non-output shaft, an elastic structure is formed between the floating member (12) and the vertical slide (11), and the movement trajectories of the floating member (12) and the vertical slide (11) are parallel to the axis of the rotor; When the end face of the output shaft end is not in contact with the end face of the input end, the vertical slide (11) drives the floating member (12) and the rotor to move vertically; when the end face of the output shaft end is in contact with the end face of the input end, the floating member (12), the rotor and the gearbox remain stationary, and the vertical slide (11) moves relative to the floating member (12) in a direction away from the rotor.

2. The press-fitting device according to claim 1, characterized in that: The upper pressure assembly (1) comprises: an upper top piece (13) coinciding with the axis of the rotor, the upper top piece (13) being arranged on the floating piece (12), the floating piece (12) driving the upper top piece (13) to move, and the upper top piece (13) applying pressure to the end surface of the non-output shaft end of the rotor; and The vertical slide (11) is slidably connected to the floating member (12). When the vertical slide (11) moves relative to the floating member (12), the vertical slide (11) applies pressure directed toward the rotor to the floating member (12) through an elastic structure. The vertical slide (11) can limit the position of the floating member (12) relative to the vertical slide (11).

3. The press-fitting device according to claim 2, characterized in that: The invention also comprises a lower top assembly (2), wherein the lower top assembly (2) comprises a lower top member (22), wherein the lower top member (22) comprises a lower top (221) and a lower top lifting member (222), wherein the lower top (221) contacts the end face of the output shaft end of the rotor, and the axis of the lower top (221) coincides with the axis of the rotor, and the lower top lifting member (222) can drive the lower top (221) to apply pressure to the end face of the output shaft end of the rotor to maintain the force balance of the rotor.

4. The press-fitting device according to claim 3, characterized in that: The invention also comprises a rotating shaft assembly (3), wherein the rotating shaft assembly (3) comprises a rotating shaft (31), wherein the rotation of the rotating shaft (31) can drive the external spline at the input end of the gearbox to rotate relative to the internal spline of the output shaft of the rotor, and when the angles of the internal spline and the external spline match, the elastic force generated by the elastic structure of the vertical slide (11) can push the floating member (12) away from the vertical slide (11), thereby pushing the output shaft end of the rotor into the input end of the gearbox.

5. The press-fitting device according to claim 2, characterized in that: The vertical slide (11) comprises: A movable bracket (111) slidably connected to the floating member (12), the movable bracket (111) moving along a vertical direction; a first cylinder (112) connected to the movable bracket (111), the first cylinder (112) pushing the movable bracket (111) to move; a second cylinder (113) disposed between the bottom surface of the movable bracket (111) and the floating member (12), the second cylinder (113) forming the elastic structure; and A clamping rod (114) is arranged between the movable bracket (111) and the floating member (12), and the clamping rod (114) can limit the minimum distance between the movable bracket (111) and the floating member (12).

6. The press-fitting device according to claim 2, characterized in that: The floating member (12) comprises: A floating plate (121) is provided with the upper top member (13), wherein the floating plate (121) is perpendicular to the movement direction of the upper top member (13); A guide shaft (122) having one end fixedly connected to the floating plate (121), the other end of the guide shaft (122) being slidably connected to the vertical slide, and the vertical slide can limit one end of the guide shaft (122); and A mechanical gripper (123) is arranged on a side of the floating plate (121) away from the vertical slide, and the mechanical gripper (123) forms a structure capable of limiting position.

7. The press-fitting device according to claim 1, characterized in that: The upper pinion component (13) comprises an upper pinion cylinder (131) arranged on the floating component (12); an upper pinion (132) is arranged at the telescopic end of the upper pinion cylinder (131); the upper pinion (132) is coaxial with the rotor; the upper pinion (132) contacts the end surface of the non-output shaft end of the rotor; the upper pinion cylinder (131) can push the upper pinion (132) to apply pressure to the non-output shaft end of the rotor.

8. The press-fitting device according to claim 4, characterized in that: The rotating shaft assembly (3) further comprises: A groove (311) is formed at one end of the rotating shaft (31) close to the upper top member (13), and the groove (311) can cause the movement state of the upper top member (13) relative to the vertical slide (11) to change during the rotation process; a lifting cylinder (34) having a telescopic end connected to the other end of the rotating shaft (31), wherein the lifting cylinder (34) drives the rotating shaft (31) to move in the same direction as the movement direction of the lower center piece (22); and A support ring (312) is connected to the shaft side of the rotating shaft (31) via a sliding groove key, and the support ring (312) can drive the rotating shaft (31) to rotate. The length direction of the sliding groove key is parallel to the axis of the rotating shaft (31).

9. The method for press-fitting a motor assembly using a press-fitting device according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: The mechanical gripper fixes the rotor on the floating part, so that the upper and lower top parts apply pressure to the midpoints of the two end surfaces of the rotor respectively; S2: The vertical slide drives the floating part, the upper top part, and the lower top part to move vertically downward until the end face of the output shaft contacts the end face of the input end, and the vertical slide continues to move downward L, so that the upper top part moves upward L relative to the vertical slide; S3: The rotation of the shaft drives the external spline at the input end to rotate around its axis, so that the internal spline of the output shaft is just embedded in the external spline of the input end, and the upper center piece moves downward L relative to the vertical slide; S4: The vertical slide continues to drive the floating part, the upper center part, and the lower center part to move downward until the motor assembly is pressed and installed.

10. The processing method according to claim 9, characterized in that: The range of L is between 3-7mm.

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