CN214499830U

CN214499830U - Three-ball pin

Info

Publication number: CN214499830U
Application number: CN202120560946.9U
Authority: CN
Inventors: 潘安平
Original assignee: Taizhou Pinjia Auto Parts Co ltd
Current assignee: Taizhou Pinjia Auto Parts Co ltd
Priority date: 2021-03-18
Filing date: 2021-03-18
Publication date: 2021-10-26
Anticipated expiration: 2031-03-18

Abstract

The utility model provides a three ball round pins belongs to mechanical technical field. The problem that the assembly operation difficulty of the existing three-ball pin and the spline shaft is large is solved. The three-ball pin comprises a three-pin frame, wherein a spline hole is formed in the three-pin frame, a pin shaft is arranged on the outer side face of the three-pin frame and is perpendicular to the spline hole, an inner ball ring capable of sliding along the axial direction of the pin shaft is sleeved on the pin shaft, a ball ring seat capable of swinging on the inner ball ring is sleeved on the inner ball ring, an outer ball ring capable of rotating around the ball ring seat is sleeved on the ball ring seat, a roller pin is arranged between the inner side face of the outer ball ring and the outer side face of the ball ring seat, one end of the spline hole is an insertion end, a conical inlet flaring face is arranged on the wall face of the insertion end, an inlet chamfering face is arranged at the port of the insertion end, a cylindrical transition face is arranged between the inlet chamfering face and the inlet flaring face on the wall face of the insertion end, and the diameter of the transition face is larger than or equal to the large diameter of the spline hole. The assembly difficulty between the three ball pins and the spline shaft is reduced.

Description

Three-ball pin

Technical Field

The utility model belongs to the technical field of machinery, a three ball round pins is related to.

Background

The universal joint is a part for realizing variable angle power transmission, is used for changing the position of the transmission axis direction, and is a joint part of a universal transmission device of an automobile driving system. The universal joint includes a non-constant velocity universal joint, a quasi-constant velocity universal joint, a constant velocity universal joint, and the like, and the tripod type universal joint is a constant velocity universal joint including an outer race and a tripod in the outer race.

The Chinese patent literature data discloses a three-ball pin assembly [ application number: CN 201310212133.0; the notice number is: CN103335028A ], including the tripod head, be equipped with three round pin axle on the tripod head, every round pin axle is equipped with the ball ring assembly, and the ball ring assembly includes inner circle, outer lane and ball ring, is equipped with the kingpin between inner circle and the ball ring, is equipped with the retaining ring to the kingpin axial spacing on the outer lane, and the outer wall of outer lane cross-section is the arc, and the outer lane inner wall is with inner circle outer wall looks adaptation.

The three-pin frame is provided with spline holes, the spline holes are matched with the spline shaft, and during installation, the spline shaft is required to be inserted into the spline holes and spline teeth on the spline shaft are matched with spline grooves in the spline holes. Therefore, in the process of assembling the spline shaft and the spline hole, axial alignment and circumferential alignment are needed, and the common spline hole structure needs to be simultaneously subjected to axial alignment and circumferential alignment, so that the assembling operation difficulty of the spline shaft and the three-pin frame is high.

Disclosure of Invention

The utility model aims at the above-mentioned problem that prior art exists, provide a three ball round pin, the technical problem of solution is how to reduce the assembly operation degree of difficulty of three ball round pins and integral key shaft.

The purpose of the utility model can be realized by the following technical proposal:

a three-ball pin comprises a three-pin frame, wherein a spline hole is formed in the three-pin frame, a pin shaft is arranged on the outer side face of the three-pin frame and is perpendicular to the spline hole, the three pin shafts are uniformly distributed around the spline hole, an inner ball ring capable of sliding along the axial direction of the pin shaft is sleeved on each pin shaft, a ball ring seat capable of swinging on the inner ball ring is sleeved on each inner ball ring, an outer ball ring capable of rotating around the ball ring seat is sleeved on each ball ring seat, a roller pin is arranged between the inner side face of each outer ball ring and the outer side face of each ball ring seat, the three-ball pin is characterized in that one end of each spline hole is an insertion end, a conical inlet flaring face is arranged on the wall face of the hole of the insertion end, an inlet chamfer face is arranged at the port of the insertion end, and a cylindrical transition face is arranged between the inlet chamfering face and the inlet flaring face on the wall face of the hole of the insertion end, the diameter of the transition surface is larger than or equal to the major diameter of the spline hole.

When the three-ball pin is assembled with the spline shaft, the spline shaft is inserted into the spline hole from the insertion end. The inlet chamfer surface has a guiding function, so that the spline shaft smoothly enters the spline hole through the inlet chamfer surface, and the spline shaft is initially aligned with the spline hole in the axial direction. Because the diameter of transition face is greater than or equal to the major diameter of spline hole, the integral key shaft can also rotate after entering transition face department through the entry chamfer face, consequently can be earlier no matter circumferential position when the integral key shaft inserts through the entry chamfer face, rethread rotation makes the spline tooth of integral key shaft and the spline groove alignment of spline hole when the transition face is located, later because entry flaring face has the guide effect, can insert along entry flaring face after integral key shaft and spline hole circumferential alignment and realize accurate axial alignment. Therefore, preliminary axial alignment is realized by arranging the inlet chamfer surface, circumferential alignment after the preliminary axial alignment is realized by arranging the transition surface, final axial alignment is realized by arranging the inlet flaring surface, spline fit is realized, and the alignment process is carried out step by step, so that the assembly difficulty between the three-ball pin and the spline shaft can be reduced.

In the three-ball pin, the other end of the spline hole is an extending end, a step is arranged on the wall surface of the extending end, and an outlet chamfer surface is arranged at the step. The step and the outlet chamfer surface are arranged to facilitate the storage of lubricating grease, so that the lubricating grease can be conveniently filled between the spline hole and the spline shaft for sliding lubrication, and the spline shaft can smoothly slide in the spline hole.

In the three-ball pin, the avoidance chamfers are arranged between the outer side surface of the inner ball ring and the end surfaces of the two ends of the inner ball ring. The avoiding chamfer has an anti-interference effect, and the interference of the ball ring seat on the inner ball ring is avoided, so that the three-ball pin works stably and smoothly.

In the above three-ball pin, the outer end of the pin shaft protrudes out of the outer end face of the ball ring seat, the outer end face of the pin shaft is a spherical face protruding outwards, an inclined cutting plane is arranged between the outer end face and the outer side face of the pin shaft on the outer end of the pin shaft, two cutting planes are symmetrically arranged about the axis of the pin shaft, and the two cutting planes are arranged along the axial direction of the spline hole.

The outer end of the pin shaft protrudes out of the outer end face of the spherical ring seat, so that the axial length of the pin shaft can be increased, the axial sliding length of the inner spherical ring is increased, and the swing angle of the three-ball pin in the bell-shaped shell is improved. The outer end face of the pin shaft is a spherical face protruding outwards, in the process that the three-ball pin swings in the bell-shaped shell, the outer end face of the pin shaft is easily contacted with the inner side face of the bell-shaped shell, and the outer end face of the pin shaft is a spherical face, so that friction and abrasion generated in the contact process can be reduced. The outer end of the pin shaft is provided with the cutting plane, so that the interference between the outer end of the pin shaft and the spherical seat can be avoided, and the three-ball pin can smoothly swing in the bell-shaped shell.

In the three-ball pin, the outer end face of the pin shaft, the outer side face of the pin shaft and the cutting plane are all provided with carburizing and quenching layers. Therefore, the surface hardness of the pin shaft can be improved, the pin shaft is not easy to wear, and the service life of the pin shaft is ensured.

In the above three-ball pin, a convex baffle ring is arranged on the outer side surface of the inner end of the ball ring seat, the inner end surface of the outer ball ring abuts against the baffle ring, a retainer ring is clamped on the outer side surface of the outer end of the ball ring seat, a gasket is arranged between the inner end surface of the retainer ring and the outer end surface of the outer ball ring in an abutting mode, and the roller pin is located between the gasket and the baffle ring. The arrangement facilitates assembly among the ball ring seat, the outer ball ring and the roller pin.

Compared with the prior art, the utility model has the advantages of it is following:

the spline hole is provided with an inlet chamfer surface, a transition surface and an inlet flaring surface, so that the assembly difficulty of the three-ball pin and the spline shaft is reduced. The spline hole is provided with the step and the outlet chamfer surface, so that the lubricating effect is ensured. The outer end of the pin shaft protrudes out of the spherical ring seat, the outer end face of the pin shaft is a spherical face, and the outer end of the pin shaft is provided with a cutting plane, so that the swing angle of the three-ball pin is increased.

Drawings

FIG. 1 is a front view of the present tripod ball;

fig. 2 is a cross-sectional view of the tripod in the present tripod.

In the figure, 1, three pin racks; 1a, a spline hole; 1a1, insertion end; 1a2, inlet flare face; 1a3, inlet chamfer face; 1a4, transition surface; 1a5, protruding end; 1a6, outlet chamfer surface; 1a7, step; 1b, a pin shaft; 1b1, cutting plane; 2. an inner ball ring; 2a, avoiding chamfering; 3. an outer ball ring; 4. rolling needles; 5. a retainer ring; 6. a gasket; 7. a ball ring seat; 7a and a baffle ring.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

Example one

As shown in fig. 1 and 2, the tripod ball comprises a tripod head 1, wherein spline holes 1a are formed in the tripod head 1, pin shafts 1b are arranged on the outer side surface of the tripod head 1, the pin shafts 1b are perpendicular to the spline holes 1a, and the three pin shafts 1b are uniformly distributed around the spline holes 1 a. The cover is equipped with the interior ball ring 2 that can slide along round pin axle 1b axial on the round pin axle 1b, and the cover is equipped with the ball ring seat 7 that can swing on interior ball ring 2, and spherical cooperation between interior ball ring 2 and the ball ring seat 7 all is provided with between the terminal surface at interior ball ring 2's lateral surface and interior ball ring 2 both ends and dodges chamfer 2 a. The ball ring seat 7 is sleeved with an outer ball ring 3 capable of rotating around the ball ring seat 7, a plurality of roller pins 4 are arranged between the inner side surface of the outer ball ring 3 and the outer side surface of the ball ring seat 7, and the roller pins 4 are uniformly distributed around the ball ring seat 7. The outer side surface of the inner end of the ball ring seat 7 is provided with a convex retaining ring 7a, the inner end surface of the outer ball ring 3 abuts against the retaining ring 7a, the outer side surface of the outer end of the ball ring seat 7 is provided with a clamping groove, a retaining ring 5 is fixedly clamped in the clamping groove, a gasket 6 is arranged between the inner end surface of the retaining ring 5 and the outer end surface of the outer ball ring 3 in an abutting mode, and the needle roller 4 is located between the gasket 6 and the retaining ring 7 a.

The outer end of the pin shaft 1b protrudes out of the outer end face of the spherical seat 7, the outer end face of the pin shaft 1b is a spherical face protruding outwards, an inclined cutting plane 1b1 is arranged between the outer end face and the outer side face of the pin shaft 1b on the outer end of the pin shaft 1b, two cutting planes 1b1 are arranged symmetrically with respect to the axis of the pin shaft 1b, and the two cutting planes 1b1 are arranged along the axial direction of the spline hole 1 a. And the outer end surface of the pin shaft 1b, the outer side surface of the pin shaft 1b and the cutting plane 1b1 are all provided with carburizing and quenching layers, so that the friction and the wear of the pin shaft 1b are reduced.

One end of the spline hole 1a is an insertion end 1a1, and the other end of the spline hole 1a is a protruding end 1a 5. The hole wall surface of the insertion end 1a1 is provided with a conical inlet flaring surface 1a2, the port of the insertion end 1a1 is provided with a conical inlet chamfering surface 1a3, the hole wall surface of the insertion end 1a1 is provided with a cylindrical transition surface 1a4 between the inlet chamfering surface 1a3 and the inlet flaring surface 1a2, and the diameter of the transition surface 1a4 is larger than or equal to the major diameter of the spline hole 1 a. The hole wall surface of the protruding end 1a5 has a step 1a7, and the step 1a7 is provided with a conical outlet chamfered surface 1a 6.

When the tripod is assembled with the spline shaft, the spline shaft is inserted into the spline hole 1a from the insertion end 1a 1. The inlet chamfered surface 1a3 has a guiding function to smoothly enter the spline shaft into the spline hole 1a through the inlet chamfered surface 1a3, and to preliminarily align the spline shaft with the axial direction of the spline hole 1 a. Because the diameter of the transition surface 1a4 is greater than or equal to the major diameter of the spline hole 1a, the spline shaft can rotate after entering the transition surface 1a4 through the inlet chamfer surface 1a3, therefore, when the spline shaft is inserted through the inlet chamfer surface 1a3, the spline teeth of the spline shaft can be aligned with the spline grooves of the spline hole 1a through rotation at the transition surface 1a4 regardless of the circumferential position, and then, because the inlet flare surface 1a2 has a guiding function, the spline shaft can be inserted along the inlet flare surface 1a2 after being aligned with the spline hole 1a in the circumferential direction, so that accurate axial alignment is realized. Therefore, preliminary axial alignment is realized by arranging the inlet chamfer surface 1a3, circumferential alignment after preliminary axial alignment is realized by arranging the transition surface 1a4, final axial alignment is realized by arranging the inlet flare surface 1a2, spline fit is realized, and thus the assembly difficulty between the three-ball pin and the spline shaft can be reduced.

Preferably, the included angle between the inlet chamfer surface 1a3 and the axis of the spline hole 1a is 45 degrees, the included angle between the outlet chamfer surface 1a6 and the axis of the spline hole 1a is 45 degrees, and the included angle between the inlet chamfer surface 1a2 and the axis of the spline hole 1a is 15 degrees, so that the spline hole 1a can be conveniently machined, and the assembling difficulty between the three-ball pin and the spline shaft can be reduced.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. A tripod ball comprises a tripod frame (1), wherein spline holes (1a) are formed in the tripod frame (1), pin shafts (1b) are arranged on the outer side surface of the tripod frame (1), the pin shafts (1b) are perpendicular to the spline holes (1a), the pin shafts (1b) are three and are uniformly distributed around the spline holes (1a), an inner ball ring (2) capable of axially sliding along the pin shafts (1b) is sleeved on the pin shafts (1b), a ball ring seat (7) capable of swinging on the inner ball ring (2) is sleeved on the inner ball ring (2), an outer ball ring (3) capable of rotating around the ball ring seat (7) is sleeved on the ball ring seat (7), a roller pin (4) is arranged between the inner side surface of the outer ball ring (3) and the outer side surface of the ball ring seat (7), and is characterized in that one end of the spline holes (1a) is an insertion end (1a1), be provided with on the hole wall face that inserts end (1a1) and be coniform entry flaring face (1a2), the port department that inserts end (1a1) is provided with entry chamfer face (1a3), it has between entry chamfer face (1a3) and entry flaring face (1a2) to be cylindric transition face (1a4) on the hole wall face that inserts end (1a1), the diameter of transition face (1a4) is greater than or equal to the major diameter of splined hole (1 a).

2. The tripod according to claim 1, wherein the other end of the spline hole (1a) is a protruding end (1a5), the hole wall surface of the protruding end (1a5) is provided with a step (1a7), and the step (1a7) is provided with an outlet chamfer (1a 6).

3. Tripod ball according to claim 1, characterized in that an avoiding chamfer (2a) is provided between the outer side of the inner ball ring (2) and the end faces at both ends of the inner ball ring (2).

4. The tripod according to any one of claims 1 to 3, wherein the outer end of the pin shaft (1b) protrudes from the outer end surface of the spherical seat (7), the outer end surface of the pin shaft (1b) is a spherical surface protruding outward, the outer end of the pin shaft (1b) has inclined cutting planes (1b1) between the outer end surface and the outer side surface of the pin shaft (1b), the cutting planes (1b1) are two and are symmetrically arranged about the axis of the pin shaft (1b), and the two cutting planes (1b1) are arranged along the axial direction of the spline hole (1 a).

5. The tripod ball according to any one of claims 1 to 3, wherein a protruding retaining ring (7a) is arranged on the outer side surface of the inner end of the ball ring seat (7), the inner end surface of the outer ball ring (3) abuts against the retaining ring (7a), a retaining ring (5) is clamped on the outer side surface of the outer end of the ball ring seat (7), a gasket (6) is arranged between the inner end surface of the retaining ring (5) and the outer end surface of the outer ball ring (3), and the roller pin (4) is located between the gasket (6) and the retaining ring (7 a).