Three-pin frame assembling tool for driving shaft inner ball cage

Abstract

The invention relates to the technical field of assembling, and discloses a driving shaft inner ball cage three-pin frame assembling tool which comprises an annular top table, three rail grooves are formed in the inner wall of the annular top table, press-fitting assemblies are arranged in the three rail grooves correspondingly, a center table base is fixedly installed at the bottom of the annular top table and used for fixing a three-pin frame a, and the three-pin frame a is fixedly installed on the center table base. The three press-fitting assemblies are used for synchronously press-fitting the three ball rings b, each press-fitting assembly comprises a feeding shaft and a pushing ring cylinder, a plurality of caulking grooves are formed in the side wall of the feeding shaft, pressure contacts are arranged in the caulking grooves, a third movement driving mechanism is arranged in the feeding shaft, the third movement driving mechanism outputs and drives the pressure contacts to expand outwards to abut against the cavity walls of the ball rings b, and centering of the ball rings b is achieved; the press-fitting assemblies are arranged in the three directions, the feeding shaft, the second moving driving mechanism and the first moving driving mechanism are matched, the three ball rings b are synchronously press-fitted to the three shaft pins of the three-pin frame a, the multi-station synchronous assembling effect is achieved, and the working efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of assembly technology, and more particularly to an assembly tool for a tripod cage in a drive shaft. Background Art

[0002] The drive shaft is an important part of the automotive transmission system. It is the shaft connecting the transmission and the drive wheels and can transmit torque. The drive shaft mainly consists of an outer constant velocity joint, an inner constant velocity joint, a half shaft rod, an outer dust cover, an inner dust cover, and a clamp, etc. Among them, the inner constant velocity joint (tripod type), also known as a three-ball pin type constant velocity universal joint, mainly consists of a bell housing, a tripod cage, etc. There are three equally spaced axle pins on the tripod cage and ball rings are assembled. There are tracks on the inner wall of the bell housing for accommodating the ball rings of the tripod cage. In production, there is a tripod cage assembly process, that is, pressing the ball rings onto the axle pins of the tripod cage.

[0003] In existing assembly equipment, such as the "Three-ball Pin Type Universal Joint Assembly Device" disclosed in Chinese Patent (CN112264796A), includes a material placement component, a pressing component, a first feeding component, and a second feeding component. The material placement component includes a first storage tray and a second storage tray for respectively accommodating the tripod cage and the roller bearing. The pressing component includes a first positioning block, a limiting groove, and a pressing rod. The first positioning block can form an anti-rotation fit with the tripod cage, and the first positioning block can be driven by a motor to rotate circumferentially. The limiting groove can accommodate the roller bearing standing upright, and the pressing rod can stretch towards the direction of the first positioning block. The first feeding component and the second feeding component are respectively used to send the tripod cage and the roller bearing to the first positioning block and the limiting groove. Aiming at the deficiencies of the existing technology, the present invention provides a three-ball pin type universal joint assembly device, which can automatically assemble the three-ball pin type universal joint, has higher efficiency, stable quality, and effectively reduces labor costs.

[0004] However, there are still defects in the assembly process of the tripod cage in the existing assembly equipment. The equipment can only press-fit the ball rings (roller bearings) unidirectionally, so that a single tripod cage assembly requires three pressing processes, which affects the assembly efficiency. In addition, after a single pressing, the tripod cage needs to be rotated to align another axle pin with the pressing position, and its rotation angle has extremely high precision requirements. When there is a rotation angle error, it is easy to cause damage to parts and affect the assembly yield of the equipment. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the existing technology, the present invention provides an assembly tool for a tripod cage in a drive shaft to solve the problems of complex and inefficient traditional tripod cage assembly process, high precision requirements, easy occurrence of errors, and damage to parts in the above-mentioned background art.

[0006] The present invention provides the following technical solution: A three-pin bracket assembly tool for the inner constant velocity joint of a drive shaft, including an annular top table. Three track grooves are provided on the inner wall of the annular top table, and a pressing assembly is arranged in each of the three track grooves. A central pedestal is fixedly installed at the bottom of the annular top table, and the central pedestal is used to fix the three-pin bracket a. The three pressing assemblies are used to press-fit three ball rings b synchronously. The pressing assembly includes a feeding shaft and a pushing ring cylinder. A moving seat is fixedly connected to the side wall of the feeding shaft. The moving seat is slidably connected in the track groove of the annular top table. The pushing ring cylinder is sleeved on the side wall of the feeding shaft. The moving seat is driven to displace by a displacement driving mechanism II, and the pushing ring cylinder is driven to axially displace along the side wall of the feeding shaft by a displacement driving mechanism I. A number of embedding grooves are provided on the side wall of the feeding shaft, and pressure contact heads are arranged in each of the number of embedding grooves. A displacement driving mechanism III is arranged inside the feeding shaft. Each of the number of pressure contact heads is docked with the output end of the displacement driving mechanism III. The output of the displacement driving mechanism III drives the number of pressure contact heads to expand outwards to abut against the cavity wall of the ball ring b, so as to center the ball ring b.

[0007] Further, the pressure contact head includes a main contact head and an inclined strut. A number of positioning bottom columns are fixedly connected to the bottom of the main contact head. The number of positioning bottom columns penetrate into the inside of the annular top table. Both ends of the inclined strut are movably connected with U-shaped joints. The U-shaped joint at the top end of the inclined strut is fixedly connected to the side wall of the main contact head. The U-shaped joint at the bottom end of the inclined strut is connected with a T-shaped slider. A T-shaped chute is provided on the inner wall of the embedding groove of the feeding shaft. The T-shaped slider is slidably sleeved in the T-shaped chute. A transmission push-pull rod is fixedly connected to one side of the U-shaped joint at the bottom end of the inclined strut. The transmission push-pull rod penetrates into the inside of the feeding shaft and is docked with the output end of the displacement driving mechanism III.

[0008] Further, an oil injection space c is provided inside the feeding shaft and the main contact head. The positioning bottom column is tubular. The oil injection spaces c of the feeding shaft and the main contact head are communicated through the positioning bottom column. The pressure contact head and the displacement driving mechanism III are linked to extract lubricating oil into the oil injection space c and spray the lubricating oil in the oil injection space c through the pressure contact head to lubricate the cavity wall of the ball ring b.

[0009] Further, a number of oil outlet ports communicating with the oil injection space c of the main contact head are provided at the top of the main contact head. A check valve II is fixedly installed in each of the number of oil outlet ports. The displacement driving mechanism III is composed of a telescopic infusion pipe and a piston disc. The piston disc is slidably sleeved in the feeding shaft. An oil hole penetrating through to the other side is provided on one side of the piston disc, and a check valve I is installed in the oil hole. The output end of the telescopic infusion pipe is docked with the oil hole of the piston disc. The telescopic infusion pipe is used to drive the displacement of the piston disc and to transport lubricating oil.

[0010] Further, the telescopic infusion tube includes a movable tube. The side wall of the movable tube is provided with threads, and a threaded sleeve is threadedly sleeved at the threaded portion. The inner wall of the feeding shaft is provided with a knob penetrating through to the bottom of the movable seat. The threaded sleeve is drivingly connected to the knob through a bevel gear transmission group. The bottom of the movable seat is provided with a motor, and the output end of the motor is connected to the bottom end of the knob. The inner cavity of the movable tube is rectangular, and an L-shaped rectangular tube is slidably sleeved in the inner cavity of the movable tube. The other end of the L-shaped rectangular tube penetrates through the bottom of the movable seat.

[0011] Further, the outer wall of the threaded sleeve is fixedly connected to the inner wall of the feeding shaft through a rotary table bearing.

[0012] Further, the first moving driving mechanism is fixedly installed on the top of the movable seat. The output end of the first moving driving mechanism is fixedly connected to the side wall of the pushing ring cylinder through a connecting plate frame. The second moving driving mechanism is fixedly connected in the rail groove of the annular top table. The first moving driving mechanism and the second moving driving mechanism are set to but not limited to one of the following: cylinder, oil cylinder, electric cylinder, and threaded telescopic mechanism.

[0013] Further, the central pedestal includes a support platform. The support platform is fixedly connected to the bottom of the annular top table through a plurality of connecting arms. A spline seat is fixedly installed at the center of the top of the support platform.

[0014] Further, the central pedestal further includes a positioning cylinder seat and a fourth moving driving mechanism. The top of the positioning cylinder seat is provided with three V-shaped grooves for placing the three pins of the three-pin frame a to position its orientation. The fourth moving driving mechanism is fixedly installed at the bottom of the support platform, and its output shaft penetrates through the support platform and is connected to the bottom of the positioning cylinder seat. The positioning cylinder seat is sleeved on the side wall of the spline seat, and the central axis of the positioning cylinder seat coincides with the central axis of the spline seat.

[0015] Further, the central pedestal further includes a rotating driving mechanism. The rotating driving mechanism is arranged at the bottom of the support platform, and its output end penetrates through the support platform and is connected to the spline seat.

[0016] The technical effects and advantages of the present invention: By arranging the pressing components in three directions and cooperating with the feeding shaft, the second moving driving mechanism, and the first moving driving mechanism, the present invention realizes the synchronous pressing of three ball rings b onto the three pins of the three-pin frame a, achieving the effect of multi-station synchronous assembly and improving work efficiency. Compared with the traditional assembly method, there is no need to adjust the angle of the three-pin frame a to press the ball rings b one by one. While improving the efficiency, it also avoids the damage of the ball rings b caused by the error generated during the angle adjustment, resulting in the ball rings b not being aligned with the pin shafts and being damaged under pressure, thus improving the pressing accuracy. During the assembly process of the present invention, the ball ring b needs to be inserted into the side wall of the feed shaft to ensure that the output of the second shift drive mechanism can drive the ball ring b to the end position of the shaft pin of the tripod a. Based on this, the structure of the feed shaft is optimized, and a plurality of pressure contacts and a third shift drive mechanism are provided. The operation of the third shift drive mechanism drives the plurality of pressure contacts to expand outward to achieve the effect of expanding the diameter of the feed shaft, and the plurality of pressure contacts are pressed against the inner wall of the ball ring b from different directions. On the one hand, the feed shaft can be adapted to ball rings b of different cavity diameters, and on the other hand, the ball ring b has a centering effect, further improving the press-fitting accuracy and ensuring that the ball ring b can be aligned with the shaft pin of the tripod a. The present invention further improves the pressure contact, the shifting and driving mechanism, and enables the pressure contact, the shifting and driving mechanism to work in conjunction with each other during operation to lubricate the cavity wall of the ball ring b. During the assembly process, the ball ring b is displaced by pushing the ring tube, so that it slides out from the side wall of the feed shaft and is inserted into the axle pin of the tripod a for press-fitting. During this process, a large friction force is generated between the cavity wall of the ball ring b and the feed shaft and the axle pin. The lubrication effect of the cavity wall of the ball ring b is achieved through the linkage of the pressure contact, the shifting and driving mechanism, and the wear of parts during press-fitting is effectively reduced, and the smoothness of the tripod assembly process is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 Schematic diagram of the press-fit assembly structure; Figure 3 For the present invention Figure 2 Schematic diagram of the cross-sectional structure of the feeding shaft and the moving seat; Figure 4 For the present invention Figure 3 Schematic diagram of the pressure contact structure; Figure 5 For the present invention Figure 4 A schematic diagram of the enlarged structure at A in the middle; Figure 6 For the present invention Figure 4 Schematic diagram of the cross-sectional structure of the feeding shaft and the main body contact; Figure 7 For the present invention Figure 6 A schematic diagram of the enlarged structure at B in the middle; Figure 8 For the present invention Figure 6 Schematic diagram of the cross-sectional structure of the telescopic infusion tube; Figure 9 For the present invention Figure 1 Schematic diagram of the central pedestal structure.

[0018] The reference numerals are: 1, annular top platform; 2, central pedestal; 3, press-fitting assembly; 4, one-way valve one; 5, one-way valve two; 6, oil outlet; 31, feeding shaft; 32, moving seat; 33, pushing ring cylinder; 34, connecting plate frame; 35, driving mechanism one; 36, driving mechanism two; 37, pressure contact; 38, driving mechanism three; 371, main body contact; 372, positioning bottom column; 373, inclined strut; 374, U-shaped joint; 375, T-shaped slider; 376, driving push-pull rod; 381, telescopic infusion tube; 382, piston disc; 383, moving tube; 384, threaded sleeve; 385, bevel gear transmission group; 386, L-shaped rectangular tube; 387, knob; 388, motor; 389, turntable bearing; 21, support platform; 22, connecting arm; 23, spline seat; 24, positioning cylinder seat; 25, driving mechanism four. Detailed implementation manners

[0019] The detailed implementation manners of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] Refer to Figure 1-3 , the present invention provides a three-pin cage assembly tool for a drive shaft inner ball cage, including an annular top platform 1. Three rail grooves are provided on the inner wall of the annular top platform 1, and a press-fitting assembly 3 is arranged in each of the three rail grooves. A central pedestal 2 is fixedly installed at the bottom of the annular top platform 1, and the central pedestal 2 is used to fix the three-pin cage a. The three press-fitting assemblies 3 are used to synchronously press-fit three ball rings b. The press-fitting assembly 3 includes a feeding shaft 31 and a pushing ring cylinder 33. A moving seat 32 is fixedly connected to the side wall of the feeding shaft 31. The moving seat 32 is slidably connected in the rail groove of the annular top platform 1. The pushing ring cylinder 33 is sleeved on the side wall of the feeding shaft 31. The moving seat 32 is driven to displace by the driving mechanism two 36, and the pushing ring cylinder 33 is driven to axially displace along the side wall of the feeding shaft 31 by the driving mechanism one 35. A number of embedding grooves are provided on the side wall of the feeding shaft 31, and a pressure contact 37 is arranged in each of the number of embedding grooves. A driving mechanism three 38 is arranged inside the feeding shaft 31. The number of pressure contacts 37 are all docked with the output end of the driving mechanism three 38. The output of the driving mechanism three 38 drives the number of pressure contacts 37 to expand outwards and press against the cavity wall of the ball ring b, so as to center the ball ring b.

[0021] During operation, the tripod a is fixed on the central base 2, and the three ball rings b are inserted into the side walls of the feed shafts 31 of the three press-fitting assemblies 3 to form a connection. Then, the movable seat 32 is displaced through the output of the second drive mechanism 36, so that the feed shaft 31 drives the ball ring b to approach the axis pin of the tripod a, until the end of the feed shaft 31 fits with the axis pin of the tripod a, and the push ring cylinder 33 is displaced through the output of the first drive mechanism 35 to generate a driving force for the ball ring b, so that it moves out from the side wall of the feed shaft 31 and is inserted into the axis pin of the tripod a, completing the press-fitting process. In addition, since the inner diameter of the ball ring b may not match the diameter of the feed shaft 31, the ball ring b and the axis pin of the tripod a are misaligned, and the operation of the third drive mechanism 38 drives a number of pressure contacts 37 to expand outward and press against the cavity wall of the ball ring b from several different directions, so as to center the ball ring b and improve the assembly accuracy.

[0022] Reference Figure 4 , 5 The pressure contact 37 includes a main body contact 371 and an inclined support rod 373. A plurality of positioning bottom columns 372 are fixedly connected to the bottom of the main body contact 371. The plurality of positioning bottom columns 372 penetrate into the interior of the annular top platform 1. U-shaped joints 374 are movably connected to both ends of the inclined support rod 373. The U-shaped joint 374 at the top of the inclined support rod 373 is fixedly connected to the side wall of the main body contact 371. A T-shaped slider 375 is connected to the U-shaped joint 374 at the bottom of the inclined support rod 373. A T-shaped slide groove is provided on the inner wall of the embedded groove of the feeding shaft 31. The T-shaped slider 375 is slidably sleeved in the T-shaped slide groove. A transmission push-pull rod 376 is fixedly connected to one side of the U-shaped joint 374 at the bottom of the inclined support rod 373. The transmission push-pull rod 376 penetrates into the interior of the feeding shaft 31 and docks with the output end of the shift drive mechanism 38.

[0023] When the shifting and driving mechanism 38 outputs, the U-shaped joint 374 at the bottom end of the diagonal support rod 373 is driven to move, so that the diagonal support rod 373 is flipped from an inclined angle to a vertical angle. In this process, the diagonal support rod 373 generates a thrust on the main contact 371, thereby causing the main contact 371 to move outward from the embedded groove of the feed shaft 31, thereby achieving the outward expansion effect of a number of pressure contacts 37. By setting a positioning bottom column 372, the main contact 371 can be prevented from tilting when moving, and at the same time, the main contact 371 can be prevented from being laterally moved due to the support force of the diagonal support rod 373.

[0024] Reference Figure 6 , 7 An oil filling space c is provided inside the feeding shaft 31 and the main body contact 371. The positioning bottom column 372 is tubular. The feeding shaft 31 and the oil filling space c of the main body contact 371 are connected through the positioning bottom column 372. The pressure contact 37 and the shifting drive mechanism 38 are linked to extract the lubricating oil into the oil filling space c, and the lubricating oil in the oil filling space c is sprayed out through the pressure contact 37 to lubricate the cavity wall of the ball ring b.

[0025] Since the pressure contact 37 has a pressing effect on the wall of the ball ring b, a high friction force will be generated when the ball ring b is pushed out from the side wall of the feed shaft 31 by the push ring tube 33. This process will cause friction to the parts. The pressure contact 37 and the moving drive mechanism 38 cooperate to lubricate the cavity wall of the ball ring b, which can reduce friction damage. The lubricated ball ring b can also improve the smoothness of press-fitting on the shaft pin of the tripod a.

[0026] Reference Figure 6 , 7 A plurality of oil outlets 6 communicating with the oil filling space c of the main body contact 371 are provided on the top of the main body contact 371, and a one-way valve 2 5 is fixedly installed in each of the plurality of oil outlets 6. The shifting and driving mechanism 38 is composed of a telescopic infusion tube 381 and a piston disc 382. The piston disc 382 is slidably sleeved in the feeding shaft 31, and an oil hole penetrating to the other side is provided on one side of the piston disc 382, ​​and a one-way valve 1 4 is installed in the oil hole. The output end of the telescopic infusion tube 381 is connected to the oil hole of the piston disc 382, ​​and the telescopic infusion tube 381 is used to drive the displacement of the piston disc 382 and to transport lubricating oil.

[0027] When the displacement mechanism 38 outputs, that is, the output of the telescopic infusion tube 381 drives the piston disc 382 to move inside the feed shaft 31, and when the piston disc 382 moves toward the oil filling space c, the oil filling space c is compressed and the pressure increases, and the internal lubricating oil is sprayed out from the oil outlet 6 through the one-way valve 2 5 to lubricate the cavity wall of the ball ring b. When the piston disc 382 is reset, the oil filling space c increases, and its internal pressure decreases to generate suction. At this time, the lubricating oil can be absorbed through the telescopic infusion tube 381, and the lubricating oil passes through the one-way valve 1 4 to re-replenish the oil in the oil filling space c.

[0028] Reference Figure 8 The telescopic infusion tube 381 includes a moving tube 383, the side wall of the moving tube 383 is provided with a thread, and a threaded sleeve 384 is threadedly sleeved at the thread. The inner wall of the feeding shaft 31 is provided with a knob 387 that penetrates to the bottom of the moving seat 32. The threaded sleeve 384 is transmission-connected to the knob 387 through a bevel gear transmission group 385. A motor 388 is provided at the bottom of the moving seat 32, and the output end of the motor 388 is connected to the bottom end of the knob 387. The inner cavity of the moving tube 383 is set to a rectangle, and the inner cavity of the moving tube 383 is slidably sleeved with an L-shaped rectangular tube 386, and the other end of the L-shaped rectangular tube 386 penetrates the bottom of the moving seat 32.

[0029] Power is output through the motor 388. Under the transmission effect of the bevel gear transmission group 385, the threaded sleeve 384 rotates. Under the action of the threaded structure, the threaded sleeve 384 is displaced, thereby realizing the telescopic effect of the telescopic infusion tube 381. In this process, through the cooperation of the inner cavity shape characteristics of the threaded sleeve 384 and the L-shaped rectangular tube 386, the moving tube 383 can be prevented from rotating along with the threaded sleeve 384. The L-shaped rectangular tube 386 and the inner cavity of the moving tube 383 can be used for oil delivery, and lubricating oil can be connected through the bottom end of the L-shaped rectangular tube 386.

[0030] Refer to Figure 8 , the outer wall of the threaded sleeve 384 is fixedly connected to the inner wall of the feeding shaft 31 through a rotary table bearing 389.

[0031] By setting the rotary table bearing 389, axial positioning of the threaded sleeve 384 can be achieved, preventing the threaded sleeve 384 from displacing along with the moving tube 383.

[0032] Refer to Figure 2 , the first moving drive mechanism 35 is fixedly installed on the top of the moving seat 32. The output end of the first moving drive mechanism 35 is fixedly connected to the side wall of the pushing ring cylinder 33 through a connecting plate frame 34. The second moving drive mechanism 36 is fixedly connected in the track groove of the annular top platform 1. The first moving drive mechanism 35 and the second moving drive mechanism 36 are set to but not limited to: one of a cylinder, an oil cylinder, an electric cylinder, and a threaded telescopic mechanism.

[0033] Through the installation positions of the first moving drive mechanism 35 and the second moving drive mechanism 36, it can be ensured that when the second moving drive mechanism 36 is transporting, the first moving drive mechanism 35 can displace along with the moving seat 32, preventing the relative position of the pushing ring cylinder 33 from changing when the feeding shaft 31 moves and affecting the spherical ring b, and also preventing pressure on the second moving drive mechanism 36 when the first moving drive mechanism 35 is operating.

[0034] Refer to Figure 9 , the central pedestal 2 includes a support pedestal 21. The support pedestal 21 is fixedly connected to the bottom of the annular top platform 1 through a plurality of connecting arms 22. A spline seat 23 is fixedly installed at the center of the top of the support pedestal 21.

[0035] Through the spline connection between the spline seat 23 and the three-pin frame a, the assembly of the three-pin frame a is simpler and faster.

[0036] Refer to Figure 9 , the central pedestal 2 further includes a positioning cylinder seat 24 and a fourth moving drive mechanism 25. Three V-shaped grooves are opened at the top of the positioning cylinder seat 24, and the three V-shaped grooves are used to place the three shaft pins of the three-pin frame a to position its orientation. The fourth moving drive mechanism 25 is fixedly installed at the bottom of the support pedestal 21, and its output shaft passes through the support pedestal 21 and is connected to the bottom of the positioning cylinder seat 24. The positioning cylinder seat 24 is sleeved on the side wall of the spline seat 23, and the central axis of the positioning cylinder seat 24 coincides with the central axis of the spline seat 23.

[0037] Since the ball ring b is press-fitted onto the three pivot pins of the three-pin frame a from three specific directions during the assembly of the ball ring b to the three-pin frame a, there are relatively high requirements for the placement angle of the three-pin frame a. Therefore, a positioning cylinder base 24 and three V-shaped grooves opened at the top are provided to position the angle of the three-pin frame a. During operation, first, the driving mechanism four 25 operates to drive the positioning cylinder base 24 to rise in height, so that the height of the V-shaped grooves at its top is the same as the height of the top of the spline seat 23. Then, the three-pin frame a is placed into the inner cavity of the positioning cylinder base 24, and the three pivot pins of the three-pin frame a are respectively placed in the three V-shaped grooves, thereby positioning the angle of the three-pin frame a. After that, the driving mechanism four 25 drives the positioning cylinder base 24 to descend so that the three-pin frame a is spline-connected to the spline seat 23.

[0038] Referring to Figure 9 , the central pedestal 2 further includes a rotating driving mechanism, which is arranged at the bottom of the support pedestal 21, and its output end penetrates through the support pedestal 21 and is connected to the spline seat 23.

[0039] By setting the rotating driving mechanism to adjust the angle of the spline seat 23, it is convenient for the spline seat 23 to be connected to the three-pin frame a and prevent angular misalignment.

[0040] The above shows and describes the basic principles, main features and advantages of the present invention. The present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A tool for assembling a tripod bracket in a drive shaft, characterized by: It comprises an annular top platform (1), the inner wall of the annular top platform (1) is provided with three rail grooves, each of the three rail grooves is provided with a press-fitting assembly (3), a central base (2) is fixedly mounted on the bottom of the annular top platform (1), the central base (2) is used to fix a tripod bracket a, and the three press-fitting assemblies (3) are used to synchronously press-fit three ball rings b; The press-fitting assembly (3) comprises a feed shaft (31) and a push ring cylinder (33); a moving seat (32) is fixedly connected to the side wall of the feed shaft (31); the moving seat (32) is slidably connected in a track groove of the annular top platform (1); the push ring cylinder (33) is sleeved on the side wall of the feed shaft (31); the moving seat (32) is driven to move by a second drive mechanism (36); and the push ring cylinder (33) is driven to move axially along the side wall of the feed shaft (31) by a first drive mechanism (35); The side wall of the feed shaft (31) is provided with a plurality of embedded grooves, each of which is provided with a pressure contact (37). A shift drive mechanism three (38) is provided inside the feed shaft (31), and each of the plurality of pressure contacts (37) is connected to an output end of the shift drive mechanism three (38). The output of the shift drive mechanism three (38) drives the plurality of pressure contacts (37) to expand outward and press against the cavity wall of the ball ring B, thereby achieving centering of the ball ring B.

2. The assembly tool for the tripod bracket of the ball cage in the drive shaft according to claim 1, characterized in that: The pressure contact (37) comprises a main body contact (371) and an oblique support rod (373); a plurality of positioning bottom columns (372) are fixedly connected to the bottom of the main body contact (371); the plurality of positioning bottom columns (372) penetrate into the interior of the annular top platform (1); both ends of the oblique support rod (373) are movably connected to U-shaped joints (374); the U-shaped joint (374) at the top end of the oblique support rod (373) is fixedly connected to the side wall of the main body contact (371); The U-shaped joint (374) at the bottom end of the diagonal support rod (373) is connected to a T-shaped slider (375), and the inner wall of the embedded groove of the feeding shaft (31) is provided with a T-shaped slide groove, and the T-shaped slider (375) is slidably sleeved in the T-shaped slide groove. A transmission push-pull rod (376) is fixedly connected to one side of the U-shaped joint (374) at the bottom end of the diagonal support rod (373), and the transmission push-pull rod (376) passes through the inside of the feeding shaft (31) and is connected to the output end of the third shift drive mechanism (38).

3. The assembly tool for the tripod bracket of the ball cage in the drive shaft according to claim 2, characterized in that: An oil injection space c is provided inside the feed shaft (31) and the main body contact (371); the positioning bottom column (372) is tubular; the feed shaft (31) and the main body contact (371) oil injection space c are connected via the positioning bottom column (372); the pressure contact (37) and the shifting and driving mechanism (38) are linked to extract lubricating oil into the oil injection space c, and the lubricating oil in the oil injection space c is sprayed out via the pressure contact (37) to lubricate the cavity wall of the ball ring b.

4. The assembly tool for the tripod bracket of the ball cage in the drive shaft according to claim 3, characterized in that: The top of the main body contact (371) is provided with a plurality of oil outlets (6) which are in communication with the oil filling space c of the main body contact (371), and each of the plurality of oil outlets (6) is fixedly installed with a check valve 2 (5). The displacement drive mechanism 3 (38) is composed of a telescopic infusion tube (381) and a piston disc (382), and the piston disc (382) is slidably sleeved in the feed shaft (31). An oil hole extending from one side of the piston disc (382) to the other side is provided, and a check valve 1 (4) is installed in the oil hole. The output end of the telescopic infusion tube (381) is connected to the oil hole of the piston disc (382), and the telescopic infusion tube (381) is used to drive the piston disc (382) to move and to transport lubricating oil.

5. The assembly tool for the tripod bracket of the ball cage in the drive shaft according to claim 4, characterized in that: The telescopic infusion tube (381) comprises a movable tube (383), the side wall of the movable tube (383) being provided with a thread, a threaded sleeve (384) being threadedly sleeved at the thread, the inner wall of the feeding shaft (31) being provided with a knob (387) penetrating to the bottom of the movable seat (32), the threaded sleeve (384) being transmission-connected to the knob (387) via a bevel gear transmission group (385), a motor (388) being provided at the bottom of the movable seat (32), an output end of the motor (388) being connected to the bottom end of the knob (387), the inner cavity of the movable tube (383) being provided with a rectangular shape, an L-shaped rectangular tube (386) being slidably sleeved in the inner cavity of the movable tube (383), the other end of the L-shaped rectangular tube (386) penetrating the bottom of the movable seat (32).

6. The assembly tool for the tripod bracket of the ball cage in the drive shaft according to claim 5, characterized in that: The outer wall of the threaded sleeve (384) is fixedly connected to the inner wall of the feeding shaft (31) via a turntable bearing (389).

7. The assembly tool for the tripod bracket of the ball cage in the drive shaft according to claim 1, characterized in that: The first drive mechanism (35) is fixedly installed on the top of the moving seat (32); the output end of the first drive mechanism (35) is fixedly connected to the side wall of the push ring tube (33) through the connecting plate frame (34); the second drive mechanism (36) is fixedly connected in the rail groove of the annular top platform (1); the first drive mechanism (35) and the second drive mechanism (36) are configured as but not limited to: one of a pneumatic cylinder, an oil cylinder, an electric cylinder, and a threaded telescopic mechanism.

8. The assembly tool for the tripod bracket of the ball cage in the drive shaft according to claim 1, characterized in that: The central pedestal (2) comprises a support platform (21), the support platform (21) being fixedly connected to the bottom of the annular top platform (1) via a plurality of connecting arms (22), and a spline seat (23) being fixedly mounted at the center of the top of the support platform (21).

9. The assembly tool for the tripod bracket of the ball cage in the drive shaft according to claim 8, characterized in that: The center pedestal (2) further comprises a positioning cylinder seat (24) and a shifting and driving mechanism four (25). The top of the positioning cylinder seat (24) is provided with three V-shaped grooves, and the three V-shaped grooves are used to place three axle pins of a tripod a to position the orientation thereof. The shifting and driving mechanism four (25) is fixedly installed at the bottom of the support platform (21), and its output shaft passes through the support platform (21) and is connected to the bottom of the positioning cylinder seat (24). The positioning cylinder seat (24) is sleeved on the side wall of the spline seat (23), and the central axis of the positioning cylinder seat (24) overlaps with the central axis of the spline seat (23).

10. The assembly tool for the tripod bracket of the ball cage in the drive shaft according to claim 9, characterized in that: The central platform (2) further comprises a rotary drive mechanism, which is arranged at the bottom of the support platform (21), and an output end of which passes through the support platform (21) and is connected to the spline seat (23).

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