A self-lubricating automobile steering intermediate shaft and its processing technology

Abstract

The invention relates to the field of steering intermediate shafts, and specifically discloses a self-lubricating automobile steering intermediate shaft and a processing technology thereof. The self-lubricating automobile steering intermediate shaft comprises a mother shaft and a male shaft, wherein a first universal joint is fixed at one end of the mother shaft, a second universal joint is fixed at one end of the male shaft, the interior of the mother shaft is hollow and communicated with the outside, an end of the male shaft away from the second universal joint is slidably connected in the mother shaft, lubricating oil is stored in the mother shaft, a sealing component which can expand or contract with the sliding of the male shaft is arranged in the mother shaft, thereby ensuring that the relative sliding between the male shaft and the mother shaft is not affected by the air pressure in the sealing space, ensuring that the length of the steering intermediate shaft changes smoothly, and reducing the pulling force or pressure of the intermediate shaft on the steering gear and the steering column when the length of the intermediate shaft changes, thereby reducing the influence on the operation of the steering gear and the steering column, and the sealing component allows the lubricating oil to be confined in the mother shaft, thereby lubricating between the male shaft and the mother shaft, thereby reducing the wear between the male shaft and the mother shaft.

Description

Technical Field

[0001] The invention relates to the field of steering intermediate shafts, in particular to a self-lubricating automobile steering intermediate shaft and a processing technology thereof. Background Art

[0002] The steering intermediate shaft is one of the core components in the automobile steering system. It connects the steering gear and the steering column and is mainly used to transmit the operation of the steering wheel to the steering gear through the steering column. Due to the air tightness between the male shaft and the female shaft of the traditional steering intermediate shaft, when its length changes, the intermediate shaft will generate pressure toward the two ends or pulling force toward the middle, which will cause the steering gear and the steering column to be in a state of tension or compression for a long time, which will affect the operating stability of the steering gear and the steering column in the long run. If the air tightness between the male shaft and the female shaft is reduced, it will easily cause dust to enter between the male shaft and the female shaft, thereby contaminating the lubricant and increasing the wear between the male shaft and the female shaft.

[0003] Therefore, the present invention provides a self-lubricating automobile steering intermediate shaft and a processing technology thereof, so as to alleviate the above technical problems. Summary of the invention

[0004] The object of the present invention is to provide a self-lubricating automobile steering intermediate shaft and a processing technology thereof, so as to overcome the above-mentioned defects in the prior art.

[0005] A self-lubricating automobile steering intermediate shaft according to the present invention comprises a female shaft and a male shaft, a first universal joint is fixed to one end of the female shaft, a second universal joint is fixed to one end of the male shaft, the interior of the female shaft is hollow and communicated with the outside, an end of the male shaft away from the second universal joint is slidably connected to the female shaft, lubricating oil is stored in the female shaft, a sealing assembly that can expand or contract with the sliding of the male shaft is arranged in the female shaft, a sealing ring is fixed to one end of the female shaft close to the second universal joint, the sliding zone of the male shaft is located between the sealing ring and the sealing assembly, and the lubricating oil is sealed in the female shaft and between the sealing ring and the sealing assembly;

[0006] The sealing assembly includes a buffer seat, a through hole is opened at the center of the buffer seat, a deformation capsule is fixed on a side of the buffer seat away from the second universal joint, an end of the deformation capsule away from the second universal joint is closed, and the deformation capsule is connected to a cavity storing lubricating oil in the mother shaft through the through hole on the buffer seat;

[0007] The inner wall of the female shaft is divided into two parts: a connecting cavity close to the second universal joint and a receiving cavity far from the second universal joint. The spline groove is provided on the inner wall of the connecting cavity. The diameter of the male shaft is consistent with the diameter of the connecting cavity. The deformation capsule is arranged in the receiving cavity. The diameter of the connecting cavity is larger than the diameter of the receiving cavity. A step is formed at the connection between the receiving cavity and the connecting cavity. The buffer seat is fixed on the step.

[0008] The buffer seat and the deformation bag are both made of rubber material, and the outer periphery of the deformation bag is a corrugated shape formed by multiple broken lines surrounding its axis.

[0009] Through the above technical solution, the sealing assembly allows the lubricating oil to be confined in the female shaft, thereby lubricating the male shaft and the female shaft, thereby reducing the wear between the male shaft and the female shaft. At the same time, it can expand or contract with the sliding of the male shaft, ensuring that the relative sliding between the male shaft and the female shaft is not affected by the air pressure in the sealed space, ensuring that the length of the steering intermediate shaft changes smoothly, reducing the tension or pressure on the steering gear and the steering column when the length of the intermediate shaft changes, and reducing the impact on the operation of the steering gear and the steering column.

[0010] The present invention is further configured as follows: a plurality of spline grooves are provided on the inner wall of one end of the female shaft close to the second universal joint, a plurality of splines are fixed on the outer circumference of the male shaft, the splines are slidably connected to the spline grooves, and an oil groove is provided on the splines along the length direction thereof.

[0011] Through the above technical solution, the oil groove allows the lubricating oil in the mother shaft to enter between the spline and the spline groove, and penetrate through the gap between the spline and the spline groove, thereby improving the lubrication effect.

[0012] The present invention is further configured as follows: a plurality of through grooves are provided on the inner side wall of the sealing ring, the cross-sectional shape of the sealing ring is consistent with the cross-sectional shape of the spline groove portion of the mother shaft, the spline is slidably fitted with the through groove, a convex strip slidably fitted with the oil groove is fixed on the bottom wall of the through groove, and the cross-sectional shape of the convex strip is consistent with the oil groove.

[0013] Through the above technical solution, the sealing ring seals the end of the mother shaft close to the second universal joint, and the convex strip seals the oil groove, thereby preventing the leakage of lubricating oil.

[0014] The present invention is further configured as follows: the spline surface and the outer periphery of the male shaft are coated with a nylon coating, and the bottom wall of the oil groove is frosted.

[0015] Through the above technical solution, the nylon coating increases the lubricity of the spline surface and the male shaft surface. When the length of the intermediate shaft changes, the frosted oil groove increases its ability to carry lubricating oil, which is beneficial for the lubricating oil to penetrate between the spline and the spline groove.

[0016] The present invention is further configured as follows: a cover is threadedly connected to the outer periphery of one end of the female shaft close to the second universal joint, the cover is sleeved on the outer periphery of the sealing ring, the cover extends inwardly at one end close to the second universal joint to form a flange and covers the sealing ring, and the inner diameter of the flange is greater than the diameter of the male shaft.

[0017] Through the above technical solution, the sealing ring can be tightly fixed on the end of the female shaft by screwing the sealing cover on the end of the female shaft, thereby ensuring the sealing performance of the sealing ring.

[0018] The above technical solution is conducive to the deformation of the deformation capsule as the air pressure in the connecting cavity changes.

[0019] The present invention also provides a processing technology for a self-lubricating automobile steering intermediate shaft, which is used to produce the self-lubricating automobile steering intermediate shaft, and specifically comprises the following steps:

[0020] S1. Material selection: select tubular high-alloy steel with an outer diameter larger than the female shaft diameter and an inner diameter smaller than the inner diameter of the accommodating cavity, and rod-shaped high-alloy steel with a diameter larger than the male shaft diameter;

[0021] S2, rough turning, rough turning the tubular steel and the rod-shaped steel, processing the inner wall of the tubular steel into a connecting cavity and a containing cavity, the depth of the connecting cavity is adjusted according to the design requirements, and at the same time, the outer periphery of the tubular steel and the outer periphery of the rod-shaped steel are rough turned to the specified size and reserved for processing allowance;

[0022] S3, finishing turning, finishing turning the female shaft and the male shaft after rough turning, so that the roughness of the inner wall of the connecting cavity and the outer peripheral surface of the male shaft is Ra0.4μm, and turning an external thread on the outer periphery of the end of the female shaft away from the first universal joint;

[0023] S4, machining a spline groove in the side wall of the connecting cavity by a broaching lathe, and machining a spline on the outer periphery of the male shaft by a milling machine;

[0024] S5, oil groove processing, using a broaching lathe to process the oil groove on the outer surface of the spline, attaching a masking material to the surface of the spline and the male shaft to expose the oil groove, and then using a sandblasting machine to sandblast the oil groove, so that the oil groove has a frosted surface effect;

[0025] S6, nylon coating, a layer of high temperature resistant masking tape is pasted on the inner wall of the oil tank, and then a layer of primer is applied on the outer periphery of the portion of the male shaft where the splines are provided and on the surface of the splines, and then the male shaft is immersed in a fluidizing device filled with nylon powder, and a layer of nylon coating is applied on the surface of the male shaft through the fluidizing device;

[0026] S7, heat treating the processed female shaft and male shaft to obtain a finished product;

[0027] S8, drilling a hole in the portion of the first universal joint that is fixed to the female shaft, welding the first universal joint to the female shaft, connecting the accommodating cavity to the through hole on the first universal joint, and welding the second universal joint to one end of the male shaft polished rod;

[0028] S9, finished product assembly, place the pressed sealing assembly into the connecting cavity, glue the buffer seat to the step with epoxy resin glue, inject lubricating oil into the connecting cavity, insert the male shaft into the connecting cavity after passing through the sealing ring and the cover, slide the spline into the spline groove, the sealing ring abuts against the end of the female shaft, and tighten the cover on the end of the female shaft away from the first universal joint so that the sealing ring is tightly abutted against the end of the female shaft.

[0029] The beneficial effects of the present invention are as follows: the sealing component can expand or contract as the male shaft slides, thereby ensuring that the relative sliding between the male shaft and the female shaft is not affected by the air pressure in the sealing space, ensuring that the length of the steering intermediate shaft changes smoothly, and at the same time reducing the pulling force or pressure on the steering gear and the steering column when the length of the intermediate shaft changes, reducing the impact on the operation of the steering gear and the steering column, and the sealing component allows the lubricating oil to be confined in the female shaft, thereby lubricating the male shaft and the female shaft, thereby reducing the wear between the male shaft and the female shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of the present invention;

[0031] Figure 2 is a cross-sectional view of the present invention;

[0032] Figure 3 The present invention Figure 2 The enlarged schematic diagram at A in the middle;

[0033] Figure 4 The present invention Figure 2 The enlarged schematic diagram of point B in the middle;

[0034] Figure 5 It is a structural schematic diagram of the sealing cover and the sealing ring in the present invention;

[0035] Figure 6 It is a structural schematic diagram of the male shaft in the present invention;

[0036] Figure 7 The present invention Figure 6 The enlarged schematic diagram at C in the middle;

[0037] Figure 8 It is a structural schematic diagram of the sealing assembly in the present invention;

[0038] Fig. 9 It is a structural schematic diagram of the sealing ring in the present invention.

[0039] In the figure:

[0040] 10. Female shaft; 11. First universal joint; 12. Step; 13. Spline groove; 14. Accommodating cavity; 15. Connecting cavity; 20. Male shaft; 21. Second universal joint; 22. Spline; 30. Cover; 31. Sealing ring; 40. Buffer seat; 41. Deformation capsule. DETAILED DESCRIPTION

[0041] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of simplifying the description of the present invention, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0042] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is specifically described in conjunction with the embodiments below. It should be understood that the following text is only used to describe one or several specific embodiments of the present invention, and does not strictly limit the scope of protection of the specific claims of the present invention. As used herein, the terms up and down and left and right are not limited to their strict geometric definitions, but include reasonable and inconsistent tolerances for machining or human errors. The specific features of the self-lubricating automobile steering intermediate shaft and its processing technology are described in detail below:

[0043] An embodiment of the present invention:

[0044] Reference Figure 1-Figure 9 The present invention provides a self-lubricating automobile steering intermediate shaft, including a female shaft 10 and a male shaft 20, wherein a first universal joint 11 is fixed to one end of the female shaft 10, and a second universal joint 21 is fixed to one end of the male shaft 20, the interior of the female shaft 10 is hollow and communicated with the outside, and one end of the male shaft 20 away from the second universal joint 21 is slidably connected to the female shaft 10, lubricating oil is stored in the female shaft 10, and a sealing component that can expand or contract with the sliding of the male shaft 20 is arranged in the female shaft 10, a sealing ring 31 is fixed to one end of the female shaft 10 close to the second universal joint 21, and the sliding area of ​​the male shaft 20 is located between the sealing ring 31 and the sealing component, and the lubricating oil is sealed in the female shaft 10 and between the sealing ring 31 and the sealing component.

[0045] Reference Figure 3 , Figure 7 , Fig. 9A plurality of spline grooves 13 are provided on the inner wall of one end of the female shaft 10 close to the second universal joint 21, a plurality of splines 22 are fixedly provided on the outer periphery of the male shaft 20, the splines 22 are slidably connected with the spline grooves 13, an oil groove 221 is provided on the spline 22 along its length direction, a plurality of through grooves 311 are provided on the inner side wall of the sealing ring 31, the cross-sectional shape of the sealing ring 31 is consistent with the cross-sectional shape of the portion of the female shaft 10 where the spline grooves 13 are provided, the splines 22 are slidably matched with the through grooves 311, a convex strip 312 slidably matched with the oil groove 221 is fixedly provided on the bottom wall of the through groove 311, the cross-sectional shape of the convex strip 312 is consistent with the oil groove 221, the surface of the spline 22 and the outer periphery of the male shaft 20 are coated with nylon coating, and the bottom wall of the oil groove 221 is frosted.

[0046] Reference Figure 4 , Figure 5 A cover 30 is threadedly connected to the outer periphery of one end of the female shaft 10 close to the second universal joint 21. The cover 30 is sleeved on the outer periphery of the sealing ring 31. The end of the cover 30 close to the second universal joint 21 extends inward to form a flange and covers the sealing ring 31. The inner diameter of the flange is greater than the diameter of the male shaft 20.

[0047] Reference Figure 3 , Figure 8 The sealing assembly includes a buffer seat 40. A plurality of protrusions extending outward are fixedly arranged on the outer periphery of the buffer seat 40. The protrusions can be embedded in the spline groove 13. The upper end surface of the buffer seat 40 extends upward to form a convex ring. The convex ring is embedded in the accommodating cavity 14. A through hole is opened at the center of the buffer seat 40. A deformation capsule 41 is fixed on the side of the buffer seat 40 away from the second universal joint 21. The end of the deformation capsule 41 away from the second universal joint 21 is closed. The deformation capsule 41 is connected to the cavity storing lubricating oil in the mother shaft 10 through the through hole on the buffer seat 40. The inner wall of the mother shaft 10 is divided into a cavity near the second universal joint 21 and a cavity near the second universal joint 21. The spline groove 13 is arranged on the inner wall of the connecting cavity 15, the diameter of the male shaft 20 is consistent with the diameter of the connecting cavity 15, the deformation bag 41 is arranged in the accommodating cavity 14, the diameter of the connecting cavity 15 is larger than the diameter of the accommodating cavity 14, and a step 12 is formed at the connection between the accommodating cavity 14 and the connecting cavity 15, and the buffer seat 40 is fixed on the step 12. The buffer seat 40 and the deformation bag 41 are both made of rubber material, and the outer periphery of the deformation bag 41 is a corrugated shape formed by multiple broken lines surrounding its axis.

[0048] A processing technology for a self-lubricating automobile steering intermediate shaft is used to produce the self-lubricating automobile steering intermediate shaft, which specifically comprises the following steps:

[0049] S1. Material selection: select a tubular high-alloy steel material with an outer diameter greater than the diameter of the female shaft 10 and an inner diameter less than the inner diameter of the accommodating cavity 14 and a rod-shaped high-alloy steel material with a diameter greater than the diameter of the male shaft 20;

[0050] S2, rough turning, rough turning the tubular steel and the rod-shaped steel, processing the inner wall of the tubular steel to form a connecting cavity 15 and a receiving cavity 14, the depth of the connecting cavity 15 is adjusted according to the design requirements, and at the same time, the outer periphery of the tubular steel and the outer periphery of the rod-shaped steel are rough turned to a specified size and a processing allowance is reserved;

[0051] S3, finishing turning, finishing turning the female shaft 10 and the male shaft 20 after rough turning, so that the roughness of the inner wall of the connecting cavity 15 and the outer peripheral surface of the male shaft 20 is Ra0.4μm, and turning an external thread on the outer periphery of the end of the female shaft 10 away from the first universal joint 11;

[0052] S4, machining a spline groove 13 in the side wall of the connecting cavity 15 by a broaching lathe, and machining a spline 22 on the outer periphery of the male shaft 20 by a milling machine;

[0053] S5, machining the oil groove 221, machining the oil groove 221 on the outer surface of the spline 22 by a broaching lathe, in the present invention, an alloy sheet is attached to the surface of the spline 22 and the male shaft 20 as a masking material to expose the oil groove 221, and then the oil groove 221 is sandblasted by a sandblasting machine, so that the oil groove 221 forms a frosted surface effect, while ensuring that the other surfaces of the spline 22 remain smooth;

[0054] S6, nylon coating, a layer of high temperature resistant masking tape is pasted on the inner wall of the oil groove 221, and then a layer of primer is applied on the outer periphery of the portion of the male shaft 20 where the spline 22 is provided and on the surface of the spline 22, and then the male shaft 20 is immersed in a fluidizing device filled with nylon powder, and a layer of nylon coating is applied on the surface of the male shaft 20 by the fluidizing device;

[0055] S7, heat treating the processed female shaft 10 and the male shaft 20 to obtain finished products;

[0056] S8, drilling a hole in the portion of the first universal joint 11 fixed to the female shaft 10, welding the first universal joint 11 to the female shaft 10, connecting the accommodating cavity 14 to the through hole on the first universal joint 11, and welding the second universal joint 21 to one end of the polished rod of the male shaft 20;

[0057] S9, finished product assembly, place the pressed sealing assembly into the connecting cavity 15, glue the buffer seat 40 to the step 12 with epoxy resin glue, inject lubricating oil into the connecting cavity 15, insert the male shaft 20 into the connecting cavity 15 after passing through the sealing ring 31 and the cover 30, slide the spline 22 into the spline groove 13, the sealing ring 31 abuts against the end of the female shaft 10, and the cover 30 is screwed on the end of the female shaft 10 away from the first universal joint 11, so that the sealing ring 31 is tightly abutted against the end of the female shaft 10.

[0058] It will be clear to those skilled in the art that various modifications may be made to the above embodiments without departing from the overall spirit and concept of the present invention. All of them fall within the protection scope of the present invention. The protection scheme of the present invention shall be subject to the claims attached to the present invention.

Claims

1. A self-lubricating automobile steering intermediate shaft, comprising a female shaft (10) and a male shaft (20), wherein a first universal joint (11) is fixed to one end of the female shaft (10), and a second universal joint (21) is fixed to one end of the male shaft (20), characterized in that: The interior of the female shaft (10) is hollow and communicated with the outside. The end of the male shaft (20) away from the second universal joint (21) is slidably connected to the female shaft (10). Lubricating oil is stored in the female shaft (10). A sealing component that can expand or contract as the male shaft (20) slides is provided in the female shaft (10). A sealing ring (31) is fixed to the end of the female shaft (10) close to the second universal joint (21). The sliding area of ​​the male shaft (20) is located between the sealing ring (31) and the sealing component. The lubricating oil is sealed in the female shaft (10) and between the sealing ring (31) and the sealing component. The sealing assembly comprises a buffer seat (40) and a deformation capsule (41), a through hole being provided at the center of the buffer seat (40), the deformation capsule (41) being fixed on a side surface of the buffer seat (40) away from the second universal joint (21), an end of the deformation capsule (41) away from the second universal joint (21) being closed, and the deformation capsule (41) being connected to a cavity storing lubricating oil in the mother shaft (10) through the through hole on the buffer seat (40); The inner wall of the female shaft (10) is divided into two parts: a connecting cavity (15) close to the second universal joint (21) and a receiving cavity (14) far from the second universal joint (21); the spline groove (13) is provided on the inner wall of the connecting cavity (15); the diameter of the male shaft (20) is consistent with the diameter of the connecting cavity (15); the deformation capsule (41) is arranged in the receiving cavity (14); the diameter of the connecting cavity (15) is larger than the diameter of the receiving cavity (14); a step (12) is formed at the connection between the receiving cavity (14) and the connecting cavity (15); and the buffer seat (40) is fixed on the step (12); The buffer seat (40) and the deformation bag (41) are both made of rubber material, and the outer periphery of the deformation bag (41) is in a corrugated shape formed by a plurality of broken lines surrounding its axis.

2. The self-lubricating automobile steering intermediate shaft according to claim 1, characterized in that: A plurality of spline grooves (13) are formed on the inner wall of one end of the female shaft (10) close to the second universal joint (21); a plurality of splines (22) are fixedly formed on the outer circumference of the male shaft (20); the splines (22) are slidably connected to the spline grooves (13); and the splines (22) are provided with oil grooves (221) arranged along their length direction.

3. The self-lubricating automobile steering intermediate shaft according to claim 2, characterized in that: The inner wall of the sealing ring (31) is provided with a plurality of through grooves (311); the cross-sectional shape of the sealing ring (31) is consistent with the cross-sectional shape of the portion of the female shaft (10) provided with the spline groove (13); the spline (22) is slidably engaged with the through groove (311); a convex strip (312) slidably engaged with the oil groove (221) is fixedly provided on the bottom wall of the through groove (311); the cross-sectional shape of the convex strip (312) is consistent with that of the oil groove (221).

4. The self-lubricating automobile steering intermediate shaft according to claim 3, characterized in that: The surface of the spline (22) and the outer periphery of the male shaft (20) are coated with a nylon coating, and the bottom wall of the oil groove (221) is frosted.

5. The self-lubricating automobile steering intermediate shaft according to claim 1, characterized in that: A cover (30) is threadedly connected to the outer periphery of one end of the female shaft (10) close to the second universal joint (21); the cover (30) is sleeved on the outer periphery of the sealing ring (31); one end of the cover (30) close to the second universal joint (21) extends inwardly to form a flange and covers the sealing ring (31); the inner diameter of the flange is greater than the diameter of the male shaft (20).

6. A processing technology for a self-lubricating automobile steering intermediate shaft, characterized in that: The method is used to produce the self-lubricating automobile steering intermediate shaft as described in any one of claims 1 to 5, which specifically comprises the following steps: S1. Material selection: selecting a tubular high-alloy steel material having an outer diameter greater than the diameter of the female shaft (10) and an inner diameter less than the inner diameter of the accommodating cavity (14), and a rod-shaped high-alloy steel material having a diameter greater than the diameter of the male shaft (20); S2, rough turning, rough turning the tubular steel and the rod-shaped steel, processing the inner wall of the tubular steel to form a connecting cavity (15) and a receiving cavity (14), the depth of the connecting cavity (15) is adjusted according to design requirements, and at the same time, the outer periphery of the tubular steel and the outer periphery of the rod-shaped steel are rough turned to a specified size and a processing allowance is reserved; S3, fine turning, fine turning the female shaft (10) and the male shaft (20) after rough turning, so that the roughness of the inner wall of the connecting cavity (15) and the outer peripheral surface of the male shaft (20) is Ra0.4 μm, and turning an external thread on the outer periphery of the end of the female shaft (10) away from the first universal joint (11); S4, machining a spline groove (13) in the side wall of the connecting cavity (15) by a broaching lathe, and machining a spline (22) on the outer periphery of the male shaft (20) by a milling machine; S5, machining the oil groove (221), machining the oil groove (221) on the outer surface of the spline (22) by a broaching lathe, attaching a masking material to the surface of the spline (22) and the male shaft (20) to expose the oil groove (221), and then sandblasting the oil groove (221) by a sandblasting machine, so that the oil groove (221) forms a frosted surface effect; S6, nylon coating, a layer of high temperature resistant masking tape is attached to the inner wall of the oil tank (221), and then a layer of primer is applied on the outer periphery of the portion of the male shaft (20) provided with the spline (22) and on the surface of the spline (22), and then the male shaft (20) is immersed in a fluidizing device filled with nylon powder, and a layer of nylon coating is applied to the surface of the male shaft (20) by the fluidizing device; S7, heat treating the processed female shaft (10) and the male shaft (20) to obtain finished products; S8, drilling a hole in a portion of the first universal joint (11) that is fixed to the female shaft (10), welding the first universal joint (11) to the female shaft (10), connecting the accommodating cavity (14) to a through hole on the first universal joint (11), and welding the second universal joint (21) to one end of the polished rod of the male shaft (20); S9, finished product assembly, place the pressed sealing assembly into the connection cavity (15), glue the buffer seat (40) to the step (12) with epoxy resin glue, inject lubricating oil into the connection cavity (15), insert the male shaft (20) into the connection cavity (15) after passing through the sealing ring (31) and the cover (30), slide the spline (22) into the spline groove (13), the sealing ring (31) abuts against the end of the female shaft (10), and the cover (30) is screwed on the end of the female shaft (10) away from the first universal joint (11), so that the sealing ring (31) is tightly abutted against the end of the female shaft (10).

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