Method of press joining inner and outer splines of a countershaft assembly

Abstract

The application relates to a middle shaft assembly inner and outer spline press joint method, which comprises the following steps: firstly, one end of a gear shaft to be press jointed is inserted into an inner spline hole of a gear disc and is positioned on a press equipment; secondly, the press equipment controls a press joint to move to a first working position at a first speed and a first pressure value; next, the press equipment continues to control the press joint to push the gear shaft to a second working position at a second speed and a second pressure value, and the second pressure value is less than the yield strength of the gear shaft and the gear disc; then, the press equipment judges whether the press joint reaches the second working position, if not, the press equipment alarms and resets to the original position; finally, if yes, the press equipment continues to control the press joint to push the gear shaft to a third working position at the second speed and a pressure gradually greater than the second pressure value. The application protects the inner spline teeth and the outer spline teeth from being damaged and broken, reduces the product rejection rate, and improves the product quality.

Description

Technical Field

[0001] This application relates to the field of gearbox gear and shaft gear assembly technology, and particularly to a method for pressing internal and external splines of an intermediate shaft assembly. Background Technology

[0002] Currently, there are generally four connection methods for the disc gear and shaft gear components in various new energy gearboxes:

[0003] 1. The disc teeth and shaft teeth are connected by an interference fit through a round hole. Its advantages are simple connection and easy machining; its disadvantages are that the transmitted torque is significantly limited and the safety factor is not high.

[0004] 2. The disc teeth and shaft teeth are connected by internal and external splines, and the axial movement of the disc teeth is restricted by a retaining ring. The advantages are that it can transmit a large torque and has a high safety factor; the disadvantages are that the manufacturing process is more complicated, and the retaining ring cannot completely restrict the axial position of the disc teeth. Due to the existence of gaps, the disc teeth will have some movement during operation, which will generate impact and affect the NVH of the gearbox.

[0005] 3. The disc gear and shaft gear are connected using the first two methods, and then welding is used. The advantage is that the connection is reliable and the axial movement of the disc gear is eliminated, avoiding meshing impact that affects the NVH of the gearbox. The disadvantage is that the processing steps are increased, the production cost is increased, and the thermal deformation caused by welding cannot be completely avoided, which reduces the product quality to some extent.

[0006] 4. The disc teeth and shaft teeth are connected by interference fit with internal and external splines. The advantage is that the connection is reliable and eliminates axial movement of the disc teeth, avoiding meshing impact that affects the NVH of the gearbox. The disadvantage is that the internal splines of the disc teeth and the external splines of the shaft teeth need to be manually aligned before pressing to ensure the smooth progress of the pressing process.

[0007] Because the internal splines of the disc teeth are machined using a broaching machine, while the external splines of the shaft teeth are machined using a gear shaping process, the external splines have no guide angle. In addition, the interference fit between the internal and external splines makes it difficult to align them manually, making it difficult to align them effectively in one go. This causes the internal and external splines to be damaged and broken during the press-fitting process, resulting in the scrapping of the parts. In severe cases, the broken fragments fly out and cause personnel injuries. Summary of the Invention

[0008] This application provides a method for pressing internal and external splines in an intermediate shaft assembly to solve the problem in related technologies where the disc teeth and shaft teeth are connected by interference fit with internal and external splines, which makes alignment difficult and causes spline damage and tooth breakage during the pressing process, resulting in scrapped parts.

[0009] This application provides a method for crimping internal and external splines of an intermediate shaft assembly, including:

[0010] Insert one end of the gear shaft to be press-fitted into the internal spline hole of the gear disc and position them together on the press-fitting equipment.

[0011] The press fitting equipment controls the press joint to move towards the first station at a first speed and a first pressure value in a direction close to the gear shaft;

[0012] After the crimp connector reaches the first station, the crimping equipment continues to control the crimp connector to push the gear shaft to the second station at a second speed and a second pressure value in a direction close to the gear shaft. The second pressure value is less than the yield strength of the gear shaft and the gear disc.

[0013] The pressing equipment determines whether the pressing joint has reached the second station. If not, the pressing equipment alarms that the internal and external splines of the gear shaft and gear disk are not aligned and resets to the original position.

[0014] If so, the press fitting equipment continues to control the press joint to push the gear shaft towards the third station at a second speed and a pressure gradually greater than the second pressure value.

[0015] In some embodiments: the external splines of the gear shaft mesh with the internal splines of the gear disk and are interference-fitted; the external splines of the gear shaft are formed by gear shaping; the internal splines of the gear disk are formed by broaching; and the ends of both the external and internal splines have no guide structure.

[0016] In some embodiments: the first speed is greater than the second speed, the first pressure value is less than the second pressure value, the first speed is ≥100mm / s, the second speed is ≤3mm / s, the first pressure value is ≤10KN, and the second pressure value is ≤50KN.

[0017] In some embodiments: the pressing equipment includes a pressing table, the pressing table is provided with a positioning fixture for positioning and pressing the gear disk, and the pressing table is provided with a hydraulic cylinder located above the positioning fixture;

[0018] The hydraulic cylinder has a pressure joint on its telescopic arm, a pressure sensor between the telescopic arm and the pressure joint, and a displacement sensor on the hydraulic cylinder to detect the extension length of the telescopic arm.

[0019] In some embodiments: the pressing table is provided with a robotic arm and a robotic hand for gripping and rotating the gear shaft, the pressing table is provided with a camera for acquiring image information of the position between the gear shaft and the gear disk, and the pressing table is provided with a control joystick for controlling the movement of the robotic arm and the robotic hand.

[0020] In some embodiments: the pressing table is provided with a transparent protective cover, and the positioning fixture, hydraulic cylinder, robotic arm, robotic arm and camera are all located inside the transparent protective cover. The transparent protective cover is provided with a display connected to the camera, and the display is used to display image information of the position between the gear shaft and the gear disk acquired by the camera.

[0021] In some embodiments: the pressure sensor and displacement sensor are connected to a controller, the controller is used to control the hydraulic cylinder, and the controller is also connected to an alarm device fixed on the pressing platform.

[0022] In some embodiments: after the press fitting equipment controls the press joint to push the gear shaft to the third position, the press fitting equipment controls the press joint to retract a set stroke and then controls the press joint to push the gear shaft to the third position again.

[0023] In some embodiments: after the press fitting equipment controls the press joint to retract a set stroke and then controls the press joint to push the gear shaft to the third position again, it holds pressure for a set period of time and then resets to the original position. The set pressure holding period of time is 1-5 seconds.

[0024] In some embodiments, the pressure value of the press fitting equipment after the press fitting pushes the gear shaft to the third station is 185KN.

[0025] The beneficial effects of the technical solution provided in this application include:

[0026] This application provides a method for crimping the internal and external splines of an intermediate shaft assembly. The method involves first inserting one end of the gear shaft to be crimped into the internal spline hole of the gear disk and positioning them together on a crimping device. Next, the crimping device controls the crimping connector to move towards the gear shaft at a first speed and a first pressure value to a first station. Then, after the crimping connector reaches the first station, the crimping device continues to control the crimping connector to push the gear shaft towards the gear shaft at a second speed and a second pressure value to a second station. The second pressure value is less than the yield strength of the gear shaft and the gear disk. Then, the crimping device determines whether the crimping connector has reached the second station. If not, the crimping device alarms that the internal and external spline teeth of the gear shaft and gear disk are not aligned and resets to their original positions. Finally, if so, the crimping device continues to control the crimping connector to push the gear shaft towards the gear shaft at a second speed and a pressure gradually greater than the second pressure value to a third station.

[0027] Therefore, in the intermediate shaft assembly internal and external spline crimping method of this application, after the crimping equipment controls the crimping head to reach the first position, the crimping equipment continues to control the crimping head to push the gear shaft to the second position at a second speed and a second pressure value, with the second pressure value being less than the yield strength of the gear shaft and gear disc. By determining whether the crimping head has reached the second position, if it has, it indicates that the internal and external splines of the gear shaft and gear disc are aligned and crimping can continue; if not, it indicates that the internal and external splines of the gear shaft and gear disc are not aligned and the mating position needs to be adjusted. Because the second pressure value is less than the yield strength of the gear shaft and gear disc, even if the internal and external splines of the gear shaft and gear disc are not aligned, the internal and external splines can be protected from being crushed or broken, reducing the product scrap rate and improving product quality. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a flowchart illustrating the method of an embodiment of this application;

[0030] Figure 2 This is a schematic diagram of the structure after the gear shaft and gear disk are pressed together according to an embodiment of this application;

[0031] Figure 3 This is a schematic diagram of the pressing equipment according to an embodiment of this application.

[0032] Figure label:

[0033] 1. Gear shaft; 2. Gear disc; 3. Pressing equipment; 31. Pressing stand; 32. Positioning fixture; 33. Hydraulic cylinder; 34. Press fitting; 35. Pressure sensor; 36. Displacement sensor; 37. Camera; 38. Robotic arm; 39. Display; 40. Control joystick; 41. Alarm. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0035] This application provides a method for pressing internal and external splines in an intermediate shaft assembly, which can solve the problem in related technologies where the disc teeth and shaft teeth are connected by interference fit with internal and external splines, making alignment difficult and causing spline damage and tooth breakage during the pressing process, thus resulting in scrapped parts.

[0036] See Figures 1 to 3 As shown, this application embodiment provides a method for crimping the inner and outer splines of an intermediate shaft assembly, including:

[0037] Step 101: Insert one end of the gear shaft 1 to be crimped and assembled into the inner spline hole of the gear disk 2 and position them together on the crimping equipment 3. When inserting one end of the gear shaft 1 to be crimped and assembled into the inner spline hole of the gear disk 2, try to align the inner spline teeth and the outer spline teeth as much as possible.

[0038] The external spline teeth of the gear shaft 1 mesh with the internal spline teeth of the gear disk 2 and are interference-fitted. The external spline teeth of the gear shaft 1 are formed by gear shaping, and the internal spline teeth of the gear disk 2 are formed by broaching. Neither the external spline teeth nor the internal spline teeth have a guide structure at their ends.

[0039] When gear shaft 1 and gear disk 2 are pressed together, the external spline teeth of gear shaft 1 and the internal spline teeth of gear disk 2 need to be precisely aligned. If the external spline teeth and internal spline teeth are not aligned, deformation, damage or tooth breakage will occur during the pressing process.

[0040] Step 102: The press fitting equipment 3 controls the press fitting connector 34 to move towards the first station at a first speed and a first pressure value. The first speed is ≥100mm / s, so that the press fitting equipment 3 controls the press fitting connector 34 to quickly reach the first station, and the first pressure value is ≤10KN.

[0041] Step 103: After the crimping connector 34 reaches the first station, the pressing equipment 3 continues to control the crimping connector 34 to push the gear shaft 1 to the second station at a second speed and a second pressure value in a direction close to the gear shaft 1. The second pressure value is less than the material yield strength of the gear shaft 1 and the gear disk 2.

[0042] The second speed is ≤3mm / s, the second pressure value is ≤50KN, and the second pressure value is less than the material yield strength of gear shaft 1 and gear disk 2. In this step, the second speed is ≤3mm / s and the second pressure value is ≤50KN, so that the crimping joint 34 operates at a slow speed and with a pressure less than the material yield strength of gear shaft 1 and gear disk 2, in order to prevent deformation, damage or tooth breakage during the crimping process when the external spline teeth and internal spline teeth are not aligned.

[0043] Step 104: Pressing equipment 3 determines whether the press joint 34 has reached the second station. If not, pressing equipment 3 will alarm that the internal and external splines of gear shaft 1 and gear disk 2 are not aligned and reset to their original positions.

[0044] If the second pressure value is greater than the first pressure value and the crimping joint 34 has not reached the second position (i.e. the pressure has increased significantly but the crimping stroke has not increased), it can be determined that the internal spline teeth and the external spline teeth are not aligned and are colliding with each other. At this time, it is necessary to adjust and align the internal spline teeth and the external spline teeth, and then return to step 102 to crimp again.

[0045] Step 105: If the pressure and crimping stroke increase significantly, the crimping equipment 3 continues to control the crimping joint 34 to push the gear shaft 1 towards the third position at a second speed and a pressure gradually exceeding the second pressure value. When the crimping joint 34 reaches the third position, the gear shaft 1 and the gear disc 2 are properly crimped together, and the crimping process ends.

[0046] In the intermediate shaft assembly internal and external spline crimping method of this application embodiment, after the crimping equipment 3 controls the crimping joint 34 to reach the first station, the crimping equipment 3 continues to control the crimping joint 34 to push the gear shaft to the second station with a second speed and a second pressure value in the direction close to the gear shaft 1. The second pressure value is less than the material yield strength of the gear shaft 1 and the gear disk 2.

[0047] By determining whether the crimping joint 34 has reached the second position, if it has, it means that the internal and external splines of the gear shaft 1 and the gear disk 2 are aligned and crimping can continue. If not, it means that the internal and external splines of the gear shaft 1 and the gear disk 2 are not aligned and the mating position needs to be adjusted.

[0048] Since the second pressure value is less than the yield strength of the materials of gear shaft 1 and gear disk 2, even if the internal and external splines of gear shaft 1 and gear disk 2 are not aligned, the internal and external splines can be protected from being crushed and broken, thereby reducing the product scrap rate and improving product quality.

[0049] In some alternative embodiments: see Figure 2 and Figure 3 As shown, this application embodiment provides a method for pressing the inner and outer splines of an intermediate shaft assembly. In this method, the pressing equipment 3 includes a pressing table 31, a positioning fixture 32 for positioning and pressing the gear disk 2 is provided on the pressing table 31, and a hydraulic cylinder 33 located above the positioning fixture 32 is provided on the pressing table 31.

[0050] The telescopic arm of the hydraulic cylinder 33 is equipped with a pressure connector 34, which has a positioning groove that partially accommodates and positions the end of the gear shaft 1. A pressure sensor 35 is provided between the telescopic arm and the pressure connector 34. The pressure sensor 35 is used to detect the output pressure value of the hydraulic cylinder 33. The hydraulic cylinder 33 is equipped with a displacement sensor 36 for detecting the extension length of the telescopic arm.

[0051] The pressing equipment 3 of this application embodiment is provided with a positioning fixture 32 on the pressing table 31 to position and press the gear disk 2. The positioning fixture 32 positions and presses the gear disk 2 on the pressing table 31. A hydraulic cylinder 33 is provided on the pressing table 31 above the positioning fixture 32. The hydraulic cylinder 33 provides power for the interference fit pressing of the gear shaft 1 and the gear disk 2.

[0052] The telescopic arm of the hydraulic cylinder 33 is equipped with a pressure joint 34 for the downward pressing gear shaft 1. A pressure sensor 35 is provided between the telescopic arm and the pressure joint 34. The pressure sensor 35 can detect the pressure value output by the hydraulic cylinder 33, thereby accurately controlling the output pressure of the hydraulic cylinder 33 and achieving precise control.

[0053] The hydraulic cylinder 33 is equipped with a displacement sensor 36 for detecting the extension length of the telescopic arm. The displacement sensor 36 can accurately detect the extension stroke of the telescopic arm of the hydraulic cylinder 33, and thus determine the current working position information of the crimping connector 34.

[0054] Pressure sensor 35 and displacement sensor 36 are connected to a controller, which is used to control hydraulic cylinder 33. The controller is also connected to an alarm device 41 fixed on the pressing table 31. The alarm device 41 is preferably, but not limited to, an audible and visual alarm.

[0055] When the pressure sensor 35 detects that the pressure of the hydraulic cylinder 33 has reached the second pressure value and the displacement sensor 36 detects that the crimping joint 34 has not reached the second position (i.e. the pressure has increased significantly but the crimping stroke has not increased), the controller can determine that the internal spline teeth and the external spline teeth are not aligned and are colliding with each other. At this time, the alarm device 41 can issue an alarm message for misalignment.

[0056] In some alternative embodiments: see Figure 2 and Figure 3 As shown, this application embodiment provides a method for pressing the inner and outer splines of an intermediate shaft assembly. In this method, a robotic arm and a robotic hand 38 are provided on the pressing table 31 to grasp and rotate the gear shaft 1. A camera 37 is provided on the pressing table 31 to acquire image information of the position between the gear shaft 1 and the gear disk 2. A control rocker 40 is provided on the pressing table 31 to control the movement of the robotic arm and the robotic hand 38.

[0057] A transparent protective cover (not shown in the figure) is provided on the pressing table 31. The positioning fixture 32, hydraulic cylinder 33, robotic arm, robotic arm 38, and camera 37 are all located inside the transparent protective cover. The transparent protective cover prevents damage caused by tooth breakage during the pressing process. A display 39 connected to the camera 37 is provided on the transparent protective cover. The display 39 displays image information of the position between the gear shaft 1 and the gear disk 2 acquired by the camera 37.

[0058] In this embodiment, the pressing table 31 is equipped with a robotic arm and a robotic hand 38 for gripping and rotating the gear shaft 1. The robotic arm and robotic hand 38 can grip and rotate the gear shaft 1 to adjust its position relative to the gear disk 2, ensuring that they are aligned. To facilitate precise control of the robotic arm and robotic hand 38's movements, a camera 37 is provided on the pressing table 31 to acquire image information about the position between the gear shaft 1 and the gear disk 2.

[0059] The camera 37 is connected to a display 39, which displays image information of the position between the gear shaft 1 and the gear disk 2 acquired by the camera 37. The operator can observe the image information of the position between the gear shaft 1 and the gear disk 2 displayed on the display 39 by holding the control joystick 40, and then can accurately control and adjust the movement posture of the robot and the robotic arm 38, so as to align the gear shaft 1 and the gear disk 2 with each other.

[0060] In some alternative embodiments: see Figures 1 to 3 As shown, this application embodiment provides a method for pressing the inner and outer splines of an intermediate shaft assembly. In this method, after the pressing equipment 3 controls the pressing joint 34 to push the gear shaft 1 to the third position, the pressing equipment 3 controls the pressing joint 34 to retract the set stroke and then controls the pressing joint 34 to push the gear shaft 1 to the third position again.

[0061] After the press fitting equipment 3 controls the press fitting connector 34 to retract the set stroke and then controls the press fitting connector 34 to push the gear shaft 1 to the third position again, it holds the pressure for a set period of time and then resets to the original position. The set pressure holding period is 1-5 seconds. The pressure value after the press fitting equipment 3 controls the press fitting connector 34 to push the gear shaft 1 to the third position is 185KN.

[0062] In this embodiment of the application, after the press fitting equipment 3 controls the press fitting head 34 to push the gear shaft 1 to the third position, the press fitting equipment 3 controls the press fitting head 34 to retract the set stroke and then controls the press fitting head 34 to push the gear shaft 1 to the third position again. This retraction can be set to two or more times so that the axial mating surfaces of the gear shaft 1 and the gear disk 2 fit together.

[0063] Working principle

[0064] This application provides a method for crimping the internal and external splines of an intermediate shaft assembly. The method involves first inserting one end of the gear shaft 1 to be crimped into the internal spline hole of the gear disk 2 and positioning it together on a crimping device 3. Next, the crimping device 3 controls the crimping connector 34 to move towards the gear shaft 1 at a first speed and a first pressure value to a first position. Then, after the crimping connector 34 reaches the first position, the crimping device 3 continues to control the crimping connector 34 to push the gear shaft 1 towards the gear shaft 1 towards a second position at a second speed and a second pressure value, where the second pressure value is less than the yield strength of the gear shaft 1 and the gear disk. Then, the crimping device 3 determines whether the crimping connector 34 has reached the second position. If not, the crimping device 3 alarms that the internal and external spline teeth of the gear shaft 1 and gear disk 2 are not aligned and resets them to their original positions. Finally, if yes, the crimping device 3 continues to control the crimping connector 34 to push the gear shaft 1 towards the gear shaft 1 towards a third position at a second speed and a pressure gradually exceeding the second pressure value.

[0065] Therefore, in the intermediate shaft assembly internal and external spline crimping method of this application, after the crimping device 3 controls the crimping head 34 to reach the first position, the crimping device 3 continues to control the crimping head 34 to push the gear shaft 1 towards the gear shaft 1 to the second position at a second speed and a second pressure value. The second pressure value is less than the yield strength of the gear shaft 1 and the gear disc 2. By judging whether the crimping head 34 has reached the second position, if it has, it means that the internal and external splines of the gear shaft 1 and the gear disc 2 are aligned and crimping can continue. If not, it means that the internal and external splines of the gear shaft 1 and the gear disc 2 are not aligned and the mating position needs to be readjusted. Since the second pressure value is less than the yield strength of the gear shaft 1 and the gear disc 2, even if the internal and external splines of the gear shaft 1 and the gear disc 2 are not aligned, the internal and external splines can be protected from being crushed or broken, reducing the product scrap rate and improving product quality.

[0066] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0067] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0068] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for pressing internal and external splines of an intermediate shaft assembly, characterized in that, include: Insert one end of the gear shaft (1) to be press-fitted into the inner spline hole of the gear disc (2) and position them together on the press-fitting equipment (3); The press fitting equipment (3) controls the press fitting joint (34) to move to the first position in a direction close to the gear shaft (1) at a first speed and a first pressure value; When the crimp connector (34) reaches the first station, the pressing equipment (3) continues to control the crimp connector (34) to push the gear shaft (1) to the second station at a second speed and a second pressure value in a direction close to the gear shaft (1). The second pressure value is less than the yield strength of the gear shaft (1) and the gear disk (2). The pressing equipment (3) determines whether the pressing joint (34) has reached the second station. If not, the pressing equipment (3) alarms that the internal spline teeth and external spline teeth of the gear shaft (1) and gear disk (2) are not aligned and resets to the original position. If so, the press fitting equipment (3) continues to control the press fitting (34) to push the gear shaft (1) towards the gear shaft (1) to the third station at a second speed and a pressure gradually greater than the second pressure value; After the press fitting equipment (3) controls the press fitting head (34) to push the gear shaft (1) to the third position, the press fitting equipment (3) controls the press fitting head (34) to retract the set stroke and then controls the press fitting head (34) to push the gear shaft (1) to the third position again; After the press fitting equipment (3) controls the press joint (34) to retract the set stroke and then controls the press joint (34) to push the gear shaft (1) to the third position again, it holds the pressure for a set period of time and then resets to the original position. The set pressure holding period of time is 1-5 seconds.

2. The method for pressing internal and external splines of an intermediate shaft assembly as described in claim 1, characterized in that: The external spline teeth of the gear shaft (1) mesh with the internal spline teeth of the gear disk (2) and are interference fit. The external spline teeth of the gear shaft (1) are formed by gear shaping, and the internal spline teeth of the gear disk (2) are formed by broaching. The ends of the external spline teeth and the internal spline teeth have no guide structure.

3. The method for pressing internal and external splines of an intermediate shaft assembly as described in claim 1, characterized in that: The first speed is greater than the second speed, the first pressure value is less than the second pressure value, the first speed is ≥100mm / s, the second speed is ≤3mm / s, the first pressure value is ≤10KN, and the second pressure value is ≤50KN.

4. The method for pressing internal and external splines of an intermediate shaft assembly as described in claim 1, characterized in that: The pressing equipment (3) includes a pressing table (31), on which a positioning fixture (32) is provided to position and press the gear disk (2), and a hydraulic cylinder (33) is provided on the pressing table (31) above the positioning fixture (32). The hydraulic cylinder (33) has a pressure connector (34) on its telescopic arm, a pressure sensor (35) is provided between the telescopic arm and the pressure connector (34), and a displacement sensor (36) is provided on the hydraulic cylinder (33) to detect the extension length of the telescopic arm.

5. The method for pressing internal and external splines of an intermediate shaft assembly as described in claim 4, characterized in that: The pressing table (31) is equipped with a robotic arm and a robotic arm (38) for gripping and rotating the gear shaft (1), and a camera (37) for acquiring image information of the position between the gear shaft (1) and the gear disk (2). The pressing table (31) is also equipped with a control joystick (40) for controlling the movement of the robotic arm and the robotic arm (38).

6. The method for pressing internal and external splines of an intermediate shaft assembly as described in claim 5, characterized in that: The press stand (31) is provided with a transparent protective cover. The positioning fixture (32), hydraulic cylinder (33), robotic arm, robotic arm (38) and camera (37) are all located inside the transparent protective cover. The transparent protective cover is provided with a display (39) connected to the camera (37). The display (39) displays image information of the position between the gear shaft (1) and the gear disk (2) obtained by the camera (37).

7. The method for pressing internal and external splines of an intermediate shaft assembly as described in claim 4, characterized in that: The pressure sensor (35) and displacement sensor (36) are connected to a controller, which is used to control the hydraulic cylinder (33). The controller is also connected to an alarm device (41) fixed on the press stand (31).

8. The method for pressing internal and external splines of an intermediate shaft assembly as described in claim 1, characterized in that: The pressure value of the press fitting equipment (3) after the control press joint (34) pushes the gear shaft (1) to the third station is 185KN.

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