Tripod pin

Abstract

The utility model provides a tripod, and belongs to the technical field of automobile accessories. The tripod solves the problem of clamping stagnation of an existing tripod during working. The tripod comprises a tripod frame, the tripod frame comprises a center body and three pin shafts integrally arranged on the outer side face of the center body, the pin shafts are sleeved with inner ball rings, roller pins are arranged between the inner side faces of the inner ball rings and the outer side faces of the pin shafts, the outer side faces of the inner ball rings are spherical surfaces, the outer side faces of the inner ball rings are sleeved with outer ball rings, and the outer side faces of the outer ball rings are spherical surfaces. The inner side face of the outer ball ring comprises a spherical swing face arranged corresponding to the outer side face of the inner ball ring, the spherical radius of the swing face is larger than that of the outer side face of the inner ball ring, a movable gap is formed between the swing face and the outer side face of the inner ball ring, and the movable gap is filled with lubricating grease. The tripod is smooth in movement when swinging and sliding at a large angle, and the clamping stagnation condition during working is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of automobile parts, and relates to a three-ball pin. BACKGROUND

[0002] The universal joint is a machine part for realizing variable-angle power transmission, and is used in positions where the direction of the transmission axis needs to be changed. It is a "joint" component of the universal transmission device of the automobile driving system. The universal joint includes a non-uniform speed universal joint, a quasi-uniform speed universal joint and an equal speed universal joint, and the equal speed universal joint can realize a large swing angle when the input shaft and the wheel hub have an angle difference. Many front-wheel drive cars transmit torque and motion through a pair of fixed equal speed universal joints (wheel hub end) and axial sliding equal speed universal joints (differential end).

[0003] The three-ball pin type universal joint is an equal speed universal joint, which includes a bell-shaped shell and a three-ball pin located in the bell-shaped shell. A transmission shaft is fixed on the three-ball pin, and the three-ball pin is installed in the bell-shaped shell. As disclosed in the Chinese patent document, a three-ball pin [publication number: CN 206377165U] includes a circular three-pin holder and three pin shafts equally arranged on the three-pin holder. A ball ring assembly is arranged on each pin shaft. The ball ring assembly includes a ball ring and a needle roller. The needle roller is arranged between the ball ring and the pin shaft, and the surface of the needle roller is in contact with the inner wall of the ball ring and the outer wall of the pin shaft. The three-ball pin further includes a snap spring. A needle roller stop ring is arranged on the pin shaft to limit the needle roller. A cavity is formed between the needle roller stop ring and the outer wall of the pin shaft. An annular placement groove is arranged on the outer wall of the pin shaft for placing the snap spring. The snap spring is located in the annular placement groove and is used to limit the needle roller stop ring.

[0004] In the above-mentioned three-ball pin, the ball ring can only rotate around the pin shaft. When the three-ball pin swings and slides in the bell-shaped shell at a large angle, the three-ball pin is prone to jamming. Utility model content

[0005] The utility model aims at the above-mentioned problems existing in the prior art, and provides a three-ball pin, which solves the technical problem of how to improve the jamming of the existing three-ball pin during work.

[0006] The utility model can be realized by the following technical schemes:

[0007] The three-ball pin comprises a three-pin frame, the three-pin frame comprises a center body and three pin shafts integrally arranged on the outer side of the center body, an inner ball ring is sleeved on the pin shaft, a needle roller is arranged between the inner side of the inner ball ring and the outer side of the pin shaft, and the outer side of the inner ball ring is a spherical surface, characterized in that an outer ball ring is sleeved on the outer side of the inner ball ring, the outer side of the outer ball ring is a spherical surface, the inner side of the outer ball ring comprises a swing surface which is arranged in correspondence with the outer side of the inner ball ring and is a spherical surface, the spherical radius of the swing surface is greater than the spherical radius of the outer side of the inner ball ring, and an active gap is formed between the swing surface and the outer side of the inner ball ring, and the active gap is filled with lubricating grease.

[0008] The center body of the three-ball pin is fixed with a transmission shaft, the three-ball pin is installed in a bell-shaped shell, the outer side of the outer ball ring is in contact with the inner side of the bell-shaped shell, the inner ball ring is sleeved on the pin shaft, the needle roller is arranged between the inner ball ring and the pin shaft, and the outer ball is sleeved on the inner ball ring, so that the outer ball ring and the inner ball ring can rotate around the pin shaft. Moreover, the outer side of the inner ball surface is a spherical surface, and the inner side of the outer ball ring is provided with a swing surface which is a spherical surface, so that the outer ball ring can also swing around the inner ball ring. At the same time, the spherical radius of the swing surface is greater than the spherical radius of the outer side of the inner ball ring, and an active gap is formed between the swing surface and the outer side of the inner ball ring, so that the outer ball ring can also axially slide and radially move relative to the pin shaft; and the active gap is filled with lubricating grease, which not only has a lubricating effect on the swing surface and the outer side of the inner ball ring, so that the outer ball ring can swing smoothly, but also has a certain thickness due to the arrangement of the lubricating grease in the active gap, so that a buffering effect can be generated when the outer ball ring swings or moves, avoiding direct collision between the outer ball ring and the inner ball ring to cause damage, reducing the swing jam caused by damage, and making the outer ball ring swing smoothly. Therefore, compared with the three-ball pin structure of the prior art, the three-ball pin of the present application can smoothly swing and slide at a large angle, and the jamming during operation is improved.

[0009] In the three-ball pin described above, the difference between the spherical radius of the swing surface and the spherical radius of the outer side of the inner ball ring is 0.4mm-0.5mm. In this way, the outer ball ring can have a certain radial movement and axial sliding space, and the outer ball ring can also swing smoothly on the inner ball ring.

[0010] In the three-ball pin described above, the inner side of the outer ball ring further comprises a cylindrical assembly surface, the assembly surface is connected to the outer end of the swing surface, and the radius of the assembly surface is equal to the spherical radius of the outer side of the inner ball ring.

[0011] The outer end of the outer ball ring towards the center body is an inner end. When assembling, the inner ball ring can be first embedded from the outer end of the outer ball ring, and since the radius of the assembling surface is equal to the spherical radius of the outer surface of the inner ball ring, the inner ball ring can just enter the space surrounded by the swinging surface, and then the inner ball ring is sleeved on the pin shaft. The assembling surface makes the assembling of the inner ball ring and the outer ball ring convenient, and after the inner ball ring is assembled into the outer ball ring, a gap in a substantially conical shape is formed between the assembling surface and the outer surface of the inner ball ring, so that the lubricating grease can be conveniently added into the movable gap through the gap. In addition, the assembling surface also has a giving effect, so that the outer ball ring can have a larger swinging angle.

[0012] In the three-ball pin, a chamfer is arranged between the assembling surface and the outer end surface of the outer ball ring. The chamfer has an assembling guiding effect, and facilitates the embedding of the inner ball ring into the outer ball ring.

[0013] In the three-ball pin, a stop ring is clamped on the outer end of the pin shaft, and the inner ball ring is axially limited between the stop ring and the center body. The stop ring prevents the inner ball ring from sliding out of the pin shaft too much, so that the assembling structure of the three-ball pin is stable.

[0014] Compared with the prior art, the utility model has the following advantages:

[0015] The outer ball ring is sleeved on the outer side of the inner ball ring, the swinging surface in a spherical shape is arranged on the inner side surface of the outer ball ring, the spherical radius of the swinging surface is greater than the spherical radius of the outer side surface of the inner ball ring, and the movable gap is formed between the swinging surface and the outer side surface of the inner ball ring, and the movable gap is filled with lubricating grease, so that the jamming condition of the three-ball pin during work is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the front view of the three-ball pin.

[0017] Figure 2 is Figure 1 the sectional view in A-A direction.

[0018] In the figure, 1, three-pin frame; 1a, center body; 1b, pin shaft; 2, inner ball ring; 3, needle roller; 4, stop ring; 5, snap spring; 6, outer ball ring; 6a, swinging surface; 6b, assembling surface; 6c, chamfer; 7, movable gap. DETAILED DESCRIPTION

[0019] The following is a specific embodiment of the utility model and further describes the technical scheme of the utility model in combination with the drawings, but the utility model is not limited to these embodiments.

[0020] As Figure 1 and Figure 2As shown, the three-ball pin comprises a three-pin frame 1, the three-pin frame 1 comprises a center body 1a and three pin shafts 1b integrally arranged on the outer side of the center body 1a, the center body 1a is provided with a spline hole for connecting a transmission shaft. The pin shaft 1b is cylindrical, the three pin shafts 1b are all arranged vertically to the spline hole, and the three pin shafts 1b are uniformly arranged along the circumference of the center body 1a. An inner ball ring 2 is sleeved on each pin shaft 1b, the inner side of the inner ball ring 2 is a cylindrical surface, the outer side of the inner ball ring 2 is a spherical surface, and a plurality of needle rollers 3 are arranged between the inner side of the inner ball ring 2 and the outer side of the pin shaft 1b, the needle rollers 3 are uniformly arranged along the circumference of the pin shaft 1b. A check ring 4 is connected to the outer end of each pin shaft 1b, and the inner ball ring 2 is axially limited between the check ring 4 and the center body 1a. The check ring 4 is connected to the pin shaft 1b by a snap spring 5, the outer diameter of the check ring 4 is greater than the inner diameter of the inner ball ring 2, so that the check ring 4 has an axial limiting effect on the inner ball ring 2. The specific structure of the check ring 4 and the retainer can refer to the patent document with the publication number CN 206377165U, which will not be described in detail here.

[0021] The outer side of the inner ball ring 2 is sleeved with an outer ball ring 6, and the outer side of the outer ball ring 6 is a spherical surface. The end of the outer ball ring 6 towards the center body 1a is an inner end. The inner side of the outer ball ring 6 includes a swing surface 6a which is correspondingly arranged with the outer side of the inner ball ring 2 and is in a spherical shape, and an assembly surface 6b which is in a cylindrical shape and is connected to the outer end of the swing surface 6a. A chamfer 6c is arranged between the assembly surface 6b and the outer end surface of the outer ball ring 6, and an inner chamfer is arranged between the swing surface 6a and the inner end surface of the outer ball ring 6. The spherical radius of the swing surface 6a is greater than the spherical radius of the outer side of the inner ball ring 2, and an active gap 7 is formed between the swing surface 6a and the outer side of the inner ball ring 2. The difference between the spherical radius of the swing surface 6a and the spherical radius of the outer side of the inner ball ring 2 is 0.4mm-0.5mm, and is generally set to 0.45mm. The radius of the assembly surface 6b is equal to the spherical radius of the outer side of the inner ball ring 2, and the inner ball ring 2 can pass through the assembly surface 6b and enter the space surrounded by the swing surface 6a. The active gap 7 is filled with lubricating grease, which can be injected into the active gap 7 by a syringe after the inner ball ring 2 is assembled into the outer ball ring 6, or the inner side of the outer ball ring 6 is coated with lubricating grease first, and then the inner ball ring 2 is assembled into the outer ball ring 6.

[0022] The center body 1a of the three-ball pin is fixed with a transmission shaft, the three-ball pin is installed in a bell-shaped shell, and the outer side surface of the outer ball ring 6 is in contact with the inner side surface of the bell-shaped shell. The inner ball ring 2 is sleeved on the pin shaft 1b, the needle roller 3 is arranged between the inner ball ring 2 and the pin shaft 1b, and the outer ball is sleeved on the inner ball ring 2, so that the outer ball ring 6 and the inner ball ring 2 can rotate around the pin shaft 1b. Moreover, the outer side surface of the inner ball is a spherical surface, the inner side surface of the outer ball ring 6 is provided with a swing surface 6a in a spherical shape, so that the outer ball ring 6 can also swing and rotate around the inner ball ring 2. At the same time, the spherical radius of the swing surface 6a is greater than the spherical radius of the outer side surface of the inner ball ring 2, and the swing surface 6a and the outer side surface of the inner ball ring 2 form an active gap 7, so that the outer ball ring 6 can also axially slide and radially move relative to the pin shaft 1b; the active gap 7 is filled with lubricating grease, the lubricating grease not only has a lubricating effect on the swing surface 6a and the outer side surface of the inner ball ring 2, so that the outer ball ring 6 swings smoothly, but also the lubricating grease arranged in the active gap 7 forms a certain thickness, so that a buffering effect can be generated when the outer ball ring 6 swings or moves, avoiding direct collision between the outer ball ring 6 and the inner ball ring 2 to cause damage, reducing the swing jam caused by damage, and making the outer ball ring 6 swing smoothly. Therefore, compared with the three-ball pin structure of the prior art, the three-ball pin is smooth in activity when swinging and sliding by a large angle, and the jamming condition during work is improved.

[0023] The specific embodiments described herein are merely illustrative of the present application. Various modifications or supplements can be made to the specific embodiments described herein or similar ways can be substituted, without departing from the spirit of the present application or exceeding the scope defined by the appended claims.

Claims

1. A three-ball pin, comprising a three-pin holder (1), wherein the three-pin holder (1) comprises a central body (1a) and three pins (1b) integrally disposed on the outer surface of the central body (1a), wherein an inner ball ring (2) is sleeved on the pin (1b), and a needle roller (3) is disposed between the inner surface of the inner ball ring (2) and the outer surface of the pin (1b), wherein the outer surface of the inner ball ring (2) is spherical, characterized in that, The inner ball ring (2) is sleeved with an outer ball ring (6) on the outside, the outer side surface of the outer ball ring (6) is a spherical surface, the inner side surface of the outer ball ring (6) comprises a swing surface (6a) which is correspondingly arranged with the outer side surface of the inner ball ring (2) and is a spherical surface, the spherical radius of the swing surface (6a) is greater than the spherical radius of the outer side surface of the inner ball ring (2), and an active gap (7) is formed between the swing surface (6a) and the outer side surface of the inner ball ring (2), and the active gap (7) is filled with lubricating grease.

2. The three-ball bushing of claim 1, wherein, The difference between the spherical radius of the swing surface (6a) and the spherical radius of the outer side surface of the inner ball ring (2) is 0.4mm-0.5mm.

3. The three-ball bushing of claim 1 wherein, The inner side surface of the outer ball ring (6) further comprises an assembly surface (6b) which is a cylindrical surface, the assembly surface (6b) is connected with the outer end of the swing surface (6a), and the radius of the assembly surface (6b) is equal to the spherical radius of the outer side surface of the inner ball ring (2).

4. The three-ball bushing of claim 3, wherein, A chamfer (6c) is arranged between the assembly surface (6b) and the outer end surface of the outer ball ring (6).

5. The tri-ball bearing pin according to any one of claims 1 to 4, wherein A check ring (4) is clamped on the outer end of the pin shaft (1b), and the inner ball ring (2) is axially limited between the check ring (4) and the center body (1a).

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