Transmission shaft spin riveting method and device

Abstract

The invention relates to the technical field of transmission shafts, in particular to a transmission shaft spin riveting method and device. The transmission shaft spin riveting method comprises the steps that a transmission shaft assembly is positioned on a rotating unit; the protective cover is adsorbed and positioned on the lower side of the press-fitting unit; on the basis that both the transmission shaft assembly and the protective cover are positioned, the press-fitting unit is controlled to descend by a first distance, so that the protective cover is press-fitted and positioned, and the press-fitting unit applies first downward pressure to the protective cover; based on press-fitting positioning of the protective cover, the press-fitting unit is controlled to ascend by a second distance, and the press-fitting unit applies second downward pressure to the protective cover; second downward pressure is applied to the protective cover based on the press-fitting unit, and the rotating unit is controlled to drive the transmission shaft assembly to rotate at the first rotating speed; and controlling the hemming unit to extrude and hemming the protective cover based on the first rotating speed rotation of the transmission shaft assembly. Therefore, the problem that the service life of the thrust bearing is short under the working condition that downward pressure needs to be borne in the process that the rotating unit drives the transmission shaft assembly to rotate is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transmission shaft, in particular to a transmission shaft spin riveting method and device. BACKGROUND

[0002] The transmission shaft is a rigid shaft part connecting two parts with different shaft lines or relative position changes in the mechanical transmission system, and its core function is to transmit power. It is widely used in vehicles, engineering machinery, ships and other equipment. For example, in the vehicle transmission system, one end of the transmission shaft is connected to the power output end, such as the gearbox, and the other end is connected to the power input end, such as the differential. The transmission shaft transmits the power from the engine through the gearbox to the differential, and then the differential distributes the power to the drive wheels, and finally the power is transmitted to the wheels through the drive shaft. The universal joint is a core component for transmitting power between shafts with different shaft lines. During driving, the gearbox and differential at both ends of the transmission shaft will have angle deviation or slight axial displacement due to suspension bumping and body posture changes. Therefore, the transmission shaft must be equipped with a universal joint to form a transmission shaft assembly.

[0003] The ball cage universal joint includes a bell-shaped shell, an inner star wheel, a retainer, and steel balls.

[0004] The transmission shaft assembly includes a shaft, a ball cage universal joint, a sliding spline, a balance block, and a protective cover. When installing the protective cover on the bell-shaped shell of the ball cage universal joint, the protective cover needs to be pressed onto the bell-shaped shell and rotated and riveted. During the rotation and riveting process, the rotation unit drives the transmission shaft assembly to rotate, and the rotation unit needs to withstand the downward pressure of the protective cover being pressed onto the bell-shaped shell. After long-term work, the thrust bearing on the rotation unit is easily damaged. SUMMARY

[0005] To solve the problem of short service life of the thrust bearing under the working condition of the rotation unit driving the transmission shaft assembly to rotate while also needing to withstand downward pressure, the present application provides a transmission shaft spin riveting method and device.

[0006] In a first aspect, the present application provides a transmission shaft spin riveting method, comprising:

[0007] Positioning the transmission shaft assembly on the upper side of the rotation unit; wherein the transmission shaft assembly includes a shaft and a ball cage universal joint; the bell-shaped cover of the ball cage universal joint is connected to the shaft; in the state after the positioning of the transmission shaft assembly is completed, the shaft is vertically arranged, and the bell-shaped cover is located at the top end of the shaft;

[0008] Adsorbing and positioning the protective cover on the lower side of the pressing unit; wherein the pressing unit is located above the rotation unit;

[0009] based on the transmission shaft assembly and the protective cover being positioned, controlling the press-fitting unit to descend by a first distance to position the protective cover by press-fitting, the press-fitting unit applying a first downward pressing force to the protective cover; wherein, in the state of the protective cover being positioned by press-fitting, the protective cover is sleeved outside the bell-shaped cover of the ball cage universal joint, and the protective cover is in interference fit with the bell-shaped cover of the ball cage universal joint;

[0010] based on the protective cover being positioned by press-fitting, controlling the press-fitting unit to ascend by a second distance to apply a second downward pressing force to the protective cover by the press-fitting unit; wherein the second downward pressing force is less than the first downward pressing force;

[0011] based on the press-fitting unit applying the second downward pressing force to the protective cover, controlling the rotation unit to drive the transmission shaft assembly to rotate at a first rotation speed;

[0012] based on the transmission shaft assembly rotating at the first rotation speed, controlling the edge curling unit to extrude and curl the outside of the protective cover.

[0013] In some embodiments, before the transmission shaft riveting method based on the transmission shaft assembly and the protective cover being positioned, controlling the press-fitting unit to descend by a first distance to position the protective cover by press-fitting, the press-fitting unit applying a first downward pressing force to the protective cover, the transmission shaft riveting method further comprises:

[0014] based on the transmission shaft assembly and the protective cover being positioned, controlling the auxiliary support unit to ascend until abutting against the bottom end of the shaft rod of the transmission shaft assembly.

[0015] In some embodiments, before the transmission shaft riveting method based on the press-fitting unit applying the second downward pressing force to the protective cover, controlling the rotation unit to drive the transmission shaft assembly to rotate, the transmission shaft riveting method further comprises:

[0016] based on the press-fitting unit applying the second downward pressing force to the protective cover, controlling the auxiliary support unit to descend until disengaging from the transmission shaft assembly.

[0017] In some embodiments, before the transmission shaft riveting method based on the protective cover being positioned by press-fitting, controlling the press-fitting unit to ascend by a second distance to apply a second downward pressing force to the protective cover by the press-fitting unit, the transmission shaft riveting method further comprises:

[0018] based on the protective cover being positioned by press-fitting, injecting a first volume of grease into the protective cover.

[0019] In some embodiments, the transmission shaft riveting method further comprises:

[0020] based on the transmission shaft assembly rotating at the first rotation speed for a first time length, controlling the crimping unit to be separated from the transmission shaft assembly, and controlling the rotating unit to be stationary, and primary crimping is completed;

[0021] based on the primary crimping being completed, injecting a second volume of grease into the protective cover;

[0022] based on the injected volume of grease reaching a sum of the first volume and the second volume, controlling the rotating unit to drive the transmission shaft assembly to rotate at a second rotation speed;

[0023] based on the transmission shaft assembly rotating at the second rotation speed, controlling the crimping unit to perform extrusion crimping on the outer side of the protective cover;

[0024] based on the transmission shaft assembly rotating at the second rotation speed for a second time length, controlling the crimping unit to be separated from the transmission shaft assembly, and controlling the rotating unit to be stationary, and twice crimping is completed.

[0025] In some embodiments, a ratio of the first volume to the second volume is greater than 1.

[0026] In some embodiments, the first rotation speed is greater than the second rotation speed.

[0027] In some embodiments, before the based on the injected volume of grease reaching the sum of the first volume and the second volume, controlling the rotating unit to drive the transmission shaft assembly to rotate at the second rotation speed, the transmission shaft riveting method further comprises:

[0028] based on the injected volume of grease reaching the sum of the first volume and the second volume, controlling the press-fitting unit to rise to a preset position, so that the press-fitting unit is separated from the protective cover;

[0029] based on the press-fitting unit being located at the preset position, accumulating a separation time length of the press-fitting unit;

[0030] based on the separation time length reaching a third time length, controlling the press-fitting unit to descend until the press-fitting unit applies a third pressing force to the protective cover.

[0031] In some embodiments, the third pressing force is greater than the second pressing force; and the third pressing force is less than the first pressing force.

[0032] In a second aspect, the present application provides a transmission shaft riveting device, which is applied to the transmission shaft riveting method of any one of the embodiments of the first aspect.

[0033] The transmission shaft riveting device comprises:

[0034] a rack;

[0035] A rotating unit is connected with the rack; the rotating unit comprises a positioning table and a rotating driving part; the rotating driving part drives the positioning table to rotate around a vertical axis;

[0036] A press-fitting unit is connected with the rack; the press-fitting unit is located above the rotating unit; the press-fitting unit comprises a press head and a press-down driving part; the press-down driving part drives the press head to ascend and descend;

[0037] An oil injection unit comprises an oil injection pipe and an oil storage tank; the oil injection pipe is vertically arranged; the oil injection pipe is arranged in the middle of the press head; the top end of the oil injection pipe is communicated with the oil storage tank; the oil storage tank is fixedly connected with the rack;

[0038] A crimping unit is connected with the rack; the crimping unit comprises a rolling wheel and a displacement driving part; the axis of the rolling wheel is vertically arranged; the displacement driving part drives the rolling wheel to move.

[0039] To solve the problem that the service life of the thrust bearing is short in the process that the rotating unit driving transmission shaft assembly rotates and also needs to bear the pressure, the present application has the following advantages:

[0040] After the press-fitting unit descends by a first distance and press-fits the protective cover on the outside of the bell-shaped cover using a first press-down force, the press-fitting unit is controlled to ascend by a second distance, and then the protective cover is continuously positioned using a second press-down force smaller than the first press-down force, and then the protective cover is riveted. In this way, the press-down force on the thrust bearing during the riveting process is reduced, and the press-down force and the riveting pressure are superimposed, so that the thrust bearing will not be damaged after long-term use. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 A transmission shaft riveting method flow chart is shown;

[0042] Figure 2 A transmission shaft riveting device structure diagram is shown. Figure 1

[0043] Reference signs: 10 transmission shaft assembly; 11 shaft rod; 12 ball cage universal joint; 20 protective cover; 30 rotating unit; 31 positioning table; 32 rotating driving part; 40 press-fitting unit; 41 press head; 42 press-down driving part; 50 oil injection unit; 51 oil injection pipe; 52 oil storage tank; 60 crimping unit; 61 rolling wheel; 62 displacement driving part; 70 auxiliary support unit; 71 auxiliary support table; 72 lifting driving part. DETAILED DESCRIPTION

[0044] ​The present disclosure will now be discussed with reference to a number of exemplary embodiments. It is to be appreciated that these embodiments are discussed solely for the purpose of enabling a better understanding of and, therefore, a better implementation of the present disclosure, and are not intended to suggest any limitation as to the scope of the present disclosure.

[0045] As used herein, the terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, are to be construed as "including but not limited to." The term "based on" is to be construed as "based at least in part on." The terms "one embodiment" and "an embodiment" are to be construed as "at least one embodiment." The term "another embodiment" is to be construed as "at least one other embodiment." The terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "vertical," "horizontal," "lateral," "longitudinal," and similar terms are used for orientation or position relationships based on the orientation or position relationships shown in the drawings. These terms are primarily used to better describe the present application and its embodiments, and are not intended to limit the indicated devices, elements or components to have a particular orientation, or to be constructed and operated in a particular orientation. Also, in addition to indicating orientation or position relationships, some of the above terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present application can be understood according to the specific circumstances. In addition, the terms "mounting", "providing", "provided with", "connecting", "connected" should be interpreted broadly. For example, it can be fixedly connected, detachably connected, or integrally configured; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are primarily used to distinguish different devices, elements or components (the specific types and configurations can be the same or different), and are not intended to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise stated, the meaning of "multiple" is two or more.

[0046] A drive shaft is a rigid shaft component in a mechanical transmission system that connects two components with different axes or with relative position changes and transmits torque and speed. A universal joint is a core component in a mechanical transmission system that realizes variable-angle power transmission between rotating shafts with different axes. Drive shafts are widely used. For example, in automobiles, drive shafts are often matched with universal joints to form a drive shaft assembly 10. A ball cage universal joint 12 is a type of universal joint. The ball cage universal joint 12 includes a bell housing, an inner star wheel, a retaining frame, steel balls, etc. The drive shaft assembly 10 includes a shaft 11, a ball cage universal joint 12, a sliding spline, a balance block, and a protective cover 20, etc. When installing the protective cover 20 on the end face of the ball cage universal joint 12, the protective cover 20 needs to be press-fitted and rotationally riveted, and then grease is injected into the protective cover 20. How to avoid the damage to the thrust bearing caused by the superposition of excessive pressure from press-fitting and pressure from rotational riveting is a problem that needs to be solved urgently. In order to solve the problem of short life of the thrust bearing under the working condition that the rotation unit 30 drives the transmission shaft assembly 10 to rotate and needs to withstand downward pressure, the present invention provides a transmission shaft rotary riveting method and device.

[0047] Example 1:

[0048] This embodiment provides a drive shaft riveting method, such as Figure 1 and Figure 2 As shown, Figure 1 This is a flow chart of a drive shaft riveting method. Figure 2 The following is a schematic diagram of the structure of a transmission shaft riveting device using the above method. Figure 1 and Figure 2 The transmission shaft riveting method includes steps S10 to S50, which are specifically described as follows:

[0049] Step S10: Position the drive shaft assembly 10 on the upper side of the rotation unit 30; wherein the drive shaft assembly 10 includes a shaft 11 and a ball cage universal joint 12; the bell-shaped cover of the ball cage universal joint 12 is connected to the shaft 11; when the drive shaft assembly 10 is positioned, the shaft 11 is vertically arranged, and the bell-shaped cover is located at the top of the shaft 11; in this state, the rotation center of the rotation unit 30 is coaxial with the axis of the shaft 11 and the bell-shaped cover, and the above three components are arranged in sequence from bottom to top.

[0050] Step S20: Position the protective cover 20 by adsorption on the lower side of the press-fitting unit 40. The shape of the lower side of the press-fitting unit 40 can be adjusted accordingly based on the shape of the upper side of the protective cover 20, and the protective cover 20 can be adsorbed using magnets. This can achieve a good positioning effect and prevent damage to the protective cover 20 during the positioning process. The press-fitting unit 40 is located above the rotating unit 30.

[0051] Step S30: based on the positioning of the transmission shaft assembly 10 and the protective cover 20 being completed, the press-fitting unit 40 is controlled to descend by a first distance to press-fit and position the protective cover 20, and the press-fitting unit 40 applies a first downward pressure to the protective cover 20; wherein, in the state of the press-fitting and positioning of the protective cover 20, the protective cover 20 is sleeved outside the bell-shaped cover of the ball cage universal joint 12, and the protective cover 20 is in interference fit with the bell-shaped cover of the ball cage universal joint 12; the first downward pressure can be set to 10 kN, so that the protective cover 20 can be stably press-fitted outside the bell-shaped cover.

[0052] Step S40: based on the press-fitting and positioning of the protective cover 20, the press-fitting unit 40 is controlled to ascend by a second distance, so that the press-fitting unit 40 applies a second downward pressure to the protective cover 20; wherein, the second downward pressure is smaller than the first downward pressure; although the press-fitting and positioning of the protective cover 20 is completed in step S30, the protective cover 20 is continuously applied with a smaller second downward pressure after the press-fitting unit 40 ascends by the second distance, so that the protective cover 20 can be tightly pressed against the outside of the bell-shaped cover, and further prevent the protective cover 20 from being displaced or even falling out due to the centrifugal force or the force of the edge rolling unit 60 in the subsequent riveting process.

[0053] Step S50: based on the press-fitting unit 40 applying the second downward pressure to the protective cover 20, the rotating unit 30 is controlled to drive the transmission shaft assembly 10 to rotate at a first rotating speed; a servo motor can be used to drive the rotating unit 30 to rotate the transmission shaft assembly 10, so that the rotating speed and the torque of the rotating unit 30 are more convenient to control.

[0054] Step S60: based on the transmission shaft assembly 10 rotating at the first rotating speed, the edge rolling unit 60 is controlled to extrude and roll the outside of the protective cover 20. In this way, the press-fitted and positioned protective cover 20 can be completely installed outside the bell-shaped cover after riveting. After the press-fitting unit 40 descends by the first distance and uses the first downward pressure to press-fit and position the protective cover 20 outside the bell-shaped cover, the protective cover 20 is continuously positioned by controlling the press-fitting unit 40 to ascend by the second distance and using the second downward pressure smaller than the first downward pressure, and then the riveting is performed on the protective cover 20. In this way, the downward pressure received by the protective cover 20 in the riveting process can be reduced, and then the downward pressure received by the transmission shaft assembly 10 can be reduced, and finally the downward pressure received by the thrust bearing can be reduced. When the downward pressure and the riveting pressure are superimposed, the thrust bearing will not be damaged in the riveting process.

[0055] In the embodiment, the second distance can be 0.1 mm to 0.3 mm, and preferably 0.2 mm. The first downward pressure can be 8 kN to 12 kN, and preferably 10 kN.

[0056] Preferably, the connection between the bell-shaped cover of the ball cage universal joint 12 and the shaft rod 11 can be set as an integral molding. In this way, the interface added by the ball cage universal joint 12 can be eliminated, the overall mechanical properties of the ball cage universal joint 12 are more uniform, and the coaxiality of the bell-shaped cover and the shaft rod 11 is ensured.

[0057] Further, before the bell-shaped cover 20 is press-fitted and positioned based on the positioning of the drive shaft assembly 10 and the bell-shaped cover 20, the drive shaft riveting method further comprises step S70, which comprises step S71, and the specific description is as follows:

[0058] Step S71: based on the positioning of the drive shaft assembly 10 and the bell-shaped cover 20, control the auxiliary support unit 70 to rise until it abuts the bottom end of the shaft rod 11 of the drive shaft assembly 10. In this way, during the press-fitting of the bell-shaped cover 20 using the first downward pressure, the auxiliary support unit 70 can help the rotating unit 30 to bear the larger first downward pressure, thereby reducing the damage to the rotating unit 30 caused by the pressure.

[0059] Further, before the bell-shaped cover 20 is press-fitted and positioned based on the positioning of the drive shaft assembly 10 and the bell-shaped cover 20, the drive shaft riveting method further comprises step S70, which comprises step S71, and the specific description is as follows:

[0060] Step S72: based on the press-fitting of the bell-shaped cover 20 by the press-fitting unit 40, control the auxiliary support unit 70 to descend until it is separated from the drive shaft assembly 10. In this way, after the pressure on the bell-shaped cover 20 is reduced, the pressure on the rotating unit 30 is also reduced, and the support of the auxiliary support unit 70 to the rotating unit 30 is removed, so that the rotating unit 30 can start to rotate.

[0061] Further, before the bell-shaped cover 20 is press-fitted and positioned based on the positioning of the drive shaft assembly 10 and the bell-shaped cover 20, the drive shaft riveting method further comprises step S70, which comprises step S71, and the specific description is as follows:

[0062] Step S73: based on the press-fitting of the bell-shaped cover 20, a sealed space is formed between the inside of the bell-shaped cover 20 and the outside of the bell-shaped shell, and a first volume of grease is injected into the bell-shaped cover 20. In this way, the leakage of the grease after the press-fitting unit 40 is raised by the second distance can be avoided, and the inside structure of the bell-shaped shell is well lubricated and cushioned.

[0063] Further, the drive shaft riveting method further comprises step S80, which comprises steps S81-S85, and the specific description is as follows:

[0064] Step S81: based on the transmission shaft assembly 10 rotating at a first rotational speed for a first time length, control the crimping unit 60 to be separated from the transmission shaft assembly 10, and control the rotating unit 30 to be stationary, and the first crimping is completed;

[0065] Step S82: based on the first crimping being completed, inject a second volume of grease into the protective cover 20;

[0066] Step S83: based on the injection amount of the grease reaching the sum of the first volume and the second volume, control the rotating unit 30 to drive the transmission shaft assembly 10 to rotate at a second rotational speed;

[0067] Step S84: based on the transmission shaft assembly 10 rotating at the second rotational speed, control the crimping unit 60 to extrude and crimp the outer side of the protective cover 20;

[0068] Step S85: based on the transmission shaft assembly 10 rotating at the second rotational speed for a second time length, control the crimping unit 60 to be separated from the transmission shaft assembly 10, and control the rotating unit 30 to be stationary, and the twice crimping is completed.

[0069] Because heat is generated during crimping, and in the closed cavity in the bell-shaped shell, the grease occupies a certain volume and expands when heated, which is more likely to cause oil leakage, so the method of injecting oil twice is used, and the injection of all the grease at one time may cause the grease to spread too little during the first riveting process. Through two times of oil injection and riveting, the grease spreads more evenly. And twice riveting can improve the crimping quality.

[0070] Further, the ratio of the first volume to the second volume is greater than 1, that is, the injection amount of the first oil injection accounts for more than 50% of the total injection amount, which meets the sealing requirement of the protective cover 20. However, if too much grease is injected, the grease may overflow during riveting and extrusion, so injecting more than half of the total amount of grease before the first riveting has better effect.

[0071] Further, since the volume of the first injected grease is greater than the volume of the second injected grease, by setting the first rotational speed to be greater than the second rotational speed, the grease spreads more evenly after the first riveting.

[0072] Further, before the transmission shaft riveting method controls the rotating unit 30 to drive the transmission shaft assembly 10 to rotate at the second rotational speed based on the injection amount of the grease reaching the sum of the first volume and the second volume, the transmission shaft riveting method further includes step S90, which includes steps S91-S93, which are specifically described as follows:

[0073] Step S91: based on the injection amount of oil reaching the sum of the first volume and the second volume, control the press-fitting unit 40 to rise to a preset position, so that the press-fitting unit 40 is separated from the protective cover 20; due to the frictional heat generated between the protective cover 20 and the outer peripheral side of the bell-shaped shell during the initial crimping process, the temperature in the internal space of the protective cover 20 increases, and because the protective cover 20 is tightly pressed by the press-fitting unit 40, the internal space pressure increases, and the second oil injection further aggravates this phenomenon. By setting the press-fitting unit 40 to separate from the protective cover 20, the internal space of the protective cover 20 can be connected to the atmosphere, thereby releasing the internal space pressure and avoiding the oil leakage phenomenon caused by excessive expansion.

[0074] Step S92: based on the press-fitting unit 40 being located at the preset position, accumulate the separation duration of the press-fitting unit 40;

[0075] Step S93: based on the separation duration reaching a third duration, control the press-fitting unit 40 to descend until the press-fitting unit 40 exerts a third downward pressure on the protective cover 20.

[0076] Further, the third downward pressure is greater than the second downward pressure; the third downward pressure is less than the first downward pressure.

[0077] Since the spin riveting relies on the heat generated by friction to deform the protective cover 20 and rivet it to the outer side of the bell-shaped shell, the quality of spin riveting is related to the rotation speed of the rotation unit 30 and the downward pressure of the press-fitting unit 40. The faster the rotation speed, the greater the downward pressure, and the higher the quality of spin riveting. Since the second rotation speed is less than the first rotation speed, setting the third downward pressure greater than the second downward pressure can ensure good spin riveting quality for both times.

[0078] Further, as shown in Figure 2 the transmission shaft spin riveting device includes a rack, a rotation unit 30, a press-fitting unit 40, an oil injection unit 50, and a crimping unit 60.

[0079] The rotation unit 30 is connected to the rack; the rotation unit 30 includes a positioning table 31 and a rotation driving part 32; the rotation driving part 32 drives the positioning table 31 to rotate around the vertical axis; in this way, the transmission shaft assembly 10 can be positioned on the positioning table 31 and rotated around the vertical axis at the first rotation speed and the second rotation speed under the driving of the positioning table 31.

[0080] The press-fitting unit 40 is connected to the rack; the press-fitting unit 40 is located above the rotation unit 30; the press-fitting unit 40 includes a press head 41 and a downward driving part 42; the downward driving part 42 drives the press head 41 to ascend and descend; in this way, the press head 41 can be used to press-fit the protective cover 20. The driving part provides the press head 41 with the first downward pressure, the second downward pressure, and the third downward pressure, and realizes the displacement of the press-fitting unit 40 by the first distance and the second distance.

[0081] The oil filling unit 50 includes an oil filling pipe 51 and an oil storage tank 52; the oil filling pipe 51 is arranged vertically; the oil filling pipe 51 passes through the middle of the pressure head 41; the top end of the oil filling pipe 51 is connected to the oil storage tank 52; the oil storage tank 52 is fixedly connected to the frame; in this way, the first volume and the second volume of grease can be injected into the protective cover 20 through the oil filling pipe 51.

[0082] The hemming unit 60 is connected to the frame and includes a rolling wheel 61 and a displacement drive 62. The axis of the rolling wheel 61 is vertically oriented, and the displacement drive 62 drives the rolling wheel 61 to move. When the hemming unit 60 receives a command to begin hemming, the displacement drive 62 drives the rolling wheel 61 to move perpendicularly to the axis of the drive shaft assembly 10, thereby contacting the protective cover 20 and initiating hemming. After hemming is completed, the rolling wheel 61 retreats in the opposite direction to disengage from the protective cover 20.

[0083] In other embodiments, Figure 2 As shown, the transmission shaft riveting device further includes an auxiliary support unit 70, which includes an auxiliary support platform 71 and a lifting drive unit 72. In this way, the lifting drive unit 72 can drive the auxiliary support platform 71 to achieve vertical displacement, providing auxiliary support for the rotating unit 30 when it is subjected to the second downward force.

[0084] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and that in actual applications, various changes may be made thereto in form and detail without departing from the scope of the present disclosure.

Claims

1. A transmission shaft riveting method, characterized in that: The transmission shaft riveting method comprises: Positioning the transmission shaft assembly on the upper side of the rotating unit; wherein the transmission shaft assembly includes a shaft and a ball cage universal joint; the bell-shaped housing of the ball cage universal joint is connected to the shaft; when the transmission shaft assembly is positioned, the shaft is vertically arranged, and the bell-shaped housing is located at the top of the shaft; Adsorbing and positioning the protective cover on the lower side of a press-fitting unit; wherein the press-fitting unit is located above the rotating unit; Based on the transmission shaft assembly and the protective cover being positioned, the press-fitting unit is controlled to descend a first distance to press-fit the protective cover into position, and the press-fitting unit applies a first downward force to the protective cover; wherein, when the protective cover is press-fitted into position, the protective cover is sleeved on the outer side of the bell-shaped cover of the ball joint, and the protective cover and the bell-shaped cover of the ball joint are interference-fitted; Based on the press-fitting positioning of the protective cover, controlling the press-fitting unit to rise a second distance so that the press-fitting unit applies a second downward force to the protective cover; wherein the second downward force is less than the first downward force; Based on the press-fitting unit applying a second downward force to the protective cover, the rotating unit is controlled to drive the transmission shaft assembly to rotate at a first speed; Based on the transmission shaft assembly rotating at the first speed, the curling unit is controlled to squeeze and curl the outer side of the protective cover.

2. A transmission shaft riveting method according to claim 1, characterized in that: After the drive shaft assembly and the protective cover are positioned, the press-fitting unit is controlled to descend a first distance to press-fit the protective cover into position, and before the press-fitting unit applies a first downward force to the protective cover, the drive shaft riveting method further includes: Based on the transmission shaft assembly and the protective cover being positioned, the auxiliary support unit is controlled to rise until it abuts against the bottom end of the shaft of the transmission shaft assembly.

3. A transmission shaft riveting method according to claim 2, characterized in that: Before applying the second downward force to the protective cover based on the press-fitting unit and controlling the rotating unit to drive the transmission shaft assembly to rotate, the transmission shaft riveting method further includes: Based on the second downward force applied by the press-fitting unit to the protective cover, the auxiliary support unit is controlled to descend until it is separated from the transmission shaft assembly.

4. A transmission shaft riveting method according to claim 1, characterized in that: Before controlling the press-fitting unit to rise a second distance based on the press-fitting positioning of the protective cover so that the press-fitting unit applies a second downward force to the protective cover, the drive shaft riveting method further includes: Based on the press-fitting and positioning of the protective cover, a first volume of grease is injected into the protective cover.

5. A transmission shaft riveting method according to claim 4, characterized in that: The transmission shaft riveting method further comprises: Based on the transmission shaft assembly rotating at the first speed for a first time period, controlling the crimping unit to separate from the transmission shaft assembly and controlling the rotating unit to be stationary, thereby completing the initial crimping; injecting a second volume of grease into the protective cover upon completion of the initial crimping; Based on the injection amount of grease reaching the sum of the first volume and the second volume, controlling the rotating unit to drive the transmission shaft assembly to rotate at a second speed; Based on the transmission shaft assembly rotating at the second speed, controlling the crimping unit to squeeze and crimp the outer side of the protective cover; Based on the transmission shaft assembly rotating at the second speed for a second time period, the curling unit is controlled to separate from the transmission shaft assembly, and the rotating unit is controlled to be stationary, and two curling operations are completed.

6. A transmission shaft riveting method according to claim 5, characterized in that: A ratio of the first volume to the second volume is greater than 1.

7. A transmission shaft riveting method according to claim 6, characterized in that: The first rotational speed is greater than the second rotational speed.

8. A transmission shaft riveting method according to claim 7, characterized in that: Before controlling the rotation unit to drive the transmission shaft assembly to rotate at a second speed based on the grease injection amount reaching the sum of the first volume and the second volume, the transmission shaft riveting method further includes: Based on the injection amount of grease reaching the sum of the first volume and the second volume, controlling the pressing unit to rise to a preset position so that the pressing unit is separated from the protective cover; Based on the press-fitting unit being located at the preset position, accumulating the separation time of the press-fitting unit; Based on the separation time reaching a third time, the press-fitting unit is controlled to descend until the press-fitting unit applies a third downward force to the protective cover.

9. A transmission shaft riveting method according to claim 8, characterized in that: The third downforce is greater than the second downforce; the third downforce is less than the first downforce.

10. A transmission shaft riveting device, applied to the transmission shaft riveting method according to any one of claims 1 to 9, characterized in that: The transmission shaft riveting device comprises: frame; A rotating unit connected to the frame; the rotating unit includes a positioning platform and a rotation drive unit; the rotation drive unit drives the positioning platform to rotate around a vertical axis; A press-fitting unit connected to the frame; the press-fitting unit is located above the rotating unit; the press-fitting unit includes a press head and a downward pressing drive unit; the downward pressing drive unit drives the press head to rise and fall; An oil filling unit, comprising an oil filling pipe and an oil storage tank; the oil filling pipe is vertically arranged; the oil filling pipe passes through the middle of the pressure head; the top end of the oil filling pipe is connected to the oil storage tank; the oil storage tank is fixedly connected to the frame; A curling unit is connected to the frame; the curling unit includes a rolling wheel and a displacement driving part; the axis of the rolling wheel is vertically arranged; the displacement driving part drives the rolling wheel to move.

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