JPH04114126U - Constant velocity joint - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the thrust force in a tripod type constant velocity joint. [Structure] When an external force that changes the joint angle is applied between the inner and outer joint members 2 and 1, the angle changes between the hemispherical roller 3 and the spherical portion 25 of the tripod shaft 23 that makes spherical contact with the fitting hole 36. while sliding in the direction, its outer peripheral surface 3
By sliding in the angular change direction with the spherical guide groove 12 that makes spherical contact at 2, the angular displacement of both the inner and outer joint members 2 and 1 is allowed. The relative displacement in the axis-perpendicular direction between the hemispherical roller 3 and the tripod shaft 23 that occurs at this time is caused by the sliding between the inner peripheral surface of the cylindrical fitting hole 36 of the hemispherical roller 3 and the spherical portion 25 of the tripod shaft 23. Absorb by doing. As a result, the thrust force generated due to the angular displacement of both the inner and outer joint members 2, 1 is reduced.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a constant velocity joint used in a driving force transmission shaft portion of an automobile.

0002

[Conventional technology]

As a conventional constant velocity joint, as shown in Figs. 4 and 5, a drive shaft (not shown) ), which has a cylindrical shape with one end open and has three spherical guide grooves extending in the axial direction on the inner circumference. 12a, and an outer joint member 1a connected to the driven shaft 6a. Three tripods are arranged coaxially inside the spherical guide groove 12a and protrude into each spherical guide groove 12a. An inner joint member 2a having a shaft 23a, and a needle bearing on each tripod shaft 23a. A roller member that is rotatably provided via the ring 25a and rolls in the spherical guide groove 12a. A tripod type constant velocity joint consisting of 3a is known.

0003 In this constant velocity joint, when the drive shaft rotates, the rotational torque is transferred to the outer joint member. 1a to the inner joint member 2a via each roller member 3a, and the driven shaft 6a is driven. Rotates at the same speed as the moving axis. Then, the drive shaft and the driven shaft 6a slide in the axial direction. The roller member 3a rolls in the spherical guide groove 12a when the joint angle is adjusted. and allow its relative and angular displacement.

0004

[Problem that the idea aims to solve]

By the way, the above constant velocity joint has a drive shaft and a driven shaft 6a (both inner and outer joint members). 2a, 1a) rotates at a joint angle, as shown in Figure 6, the low The rubber member 3a moves in an arc as shown by the two-dot chain line without following the spherical guide groove 12a. child At this time, twisting occurs between the roller member 3a and the spherical guide groove 12a, resulting in a smooth Rolling motion is not possible, and the tripod shaft 23a, needle bearing 25a, and low Since slippage occurs between the rubber member 3a and the spherical guide groove 12a, It is known that a force in the direction (thrust force) is generated. This thrust force A smaller value is preferable, as it causes vibrations that occur when starting or accelerating. Yes.

[0005] This invention was devised in view of the above problem, and the problem to be solved is The object of the present invention is to provide a constant velocity joint that reduces force.

[0006]

[Means to solve the problem]

The constant velocity joint of this invention has a cylindrical shape with one end open and extends axially around the inner circumference. an outer joint member having a plurality of spherical guide grooves; and an outer joint member coaxially disposed inside the outer joint member. It is arranged and has a spherical part at its tip, and the spherical part protrudes into the spherical guide groove. an inner joint member having a plurality of tripod axes, a hemispherical outer peripheral surface and a cylindrical It has a dowel-shaped fitting hole, and the fitting hole is slidably fitted into each of the spherical parts, and the spherical part is slidably fitted into the spherical part. It is characterized by being composed of a hemispherical roller arranged so as to be able to roll in an inner groove. It is something that

[0007]

[Effect]

In the constant velocity joint of this invention, there is a Rotational torque between the inner and outer joint members is transmitted by the hemispherical rollers. Also, within When an external force in the axial direction is applied between the two outer joint members, the hemispherical roller becomes tripod. It rotates while sliding on the spherical part of the shaft, and also rolls while being guided by the spherical guide groove. This allows both the inner and outer joint members to slide in the axial direction.

[0008] Then, an external force was applied between the inner and outer joint members that changed the joint angle. Sometimes the hemispherical roller makes spherical contact with its mating hole at an angle with the spherical part of the tripod shaft. Spherical guide groove that slides in the direction of change and makes spherical contact on its outer circumferential surface and angle change By sliding in the direction, angular displacement of both the inner and outer joint members is permitted. Also , the relative displacement in the direction perpendicular to the axis between the hemispherical roller and the tripod shaft that occurs at this time is The inner peripheral surface of the cylindrical fitting hole of the ball roller and the spherical part of the tripod shaft slide It is absorbed by As a result, due to the angular displacement of both the inner and outer joint members, The thrust force generated is reduced.

[0009]

【Example】

Hereinafter, embodiments of the present invention will be described based on the drawings. FIG. 1 shows a side view of the constant velocity joint according to this embodiment as seen from the axial direction. A sectional view taken along the line II-II is shown in Figure 2, and corresponds to Figure 2 when the joint angle is taken. A cross-sectional view is shown in FIG.

0010 The constant velocity joint of this embodiment includes an outer joint member 1 having a spherical guide groove 12 and a tip end. An inner joint member 2 having a tripod shaft 23 with a spherical portion 25 at the end, and a spherical portion 25 a hemispherical roller 3 which is slidably fitted into the spherical guide groove 12 and is disposed to be able to roll in the spherical guide groove 12; , and the bearing member 4 disposed on the tripod shaft 23 as the main element. There is.

[0011] The outer joint member 1 has a cylindrical shape with one end open, and the inner circumference has an axial Three spherical guide grooves 12 are formed at equal angular intervals. Spherical guide groove 12 is a hemispherical roller 3 whose cross-sectional shape is designed to guide the rolling of a hemispherical roller 3, which will be described later. It is formed into an arcuate shape that matches the outer peripheral surface shape of. This outer joint member 1 is The bottom side of the drive shaft is coaxially connected and fixed to one end of a drive shaft (not shown).

0012 The inner joint member 2 includes a short cylindrical base 21 and an equiangular interval from the outer periphery of the base 21. and three tripod shafts 23 which protrude in the radial direction and have a spherical part 25 at the tip. Become. When the driven shaft 6 is connected and fixed to the inner periphery of the base 21, this inner joint member 2 is constructed as follows. Also, with each tripod shaft 23 entering each spherical guide groove 12, the outer joint member 1 and coaxially arranged inside.

[0013] The hemispherical roller 3 has a hemispherical outer peripheral surface 32 and a flat surface 34. A cylinder that is spherical and extends in the center of the plane 34 in a direction perpendicular to the plane 34. It has a shaped fitting hole 36. The opening side of the fitting hole 36 has an inclined surface with a larger diameter on the opening side. 38 is formed. The diameter of the fitting hole 36 is equal to that of the spherical part 25 of the tripod shaft 23. It is formed to have approximately the same size as the diameter. This hemispherical roller 3 has a fitting hole 36 at each tip. It is slidably fitted into the spherical part 25 of the lipo shaft 23, and the spherical guide groove 12 It is fitted inside and is arranged so as to be able to roll.

[0014] The bearing member 4 includes an inner ring 41 and an outer ring 43 with balls 45 interposed between them. Consists of angular bearings. This bearing member 4 is attached to each tripod. An inner ring 41 is fitted to the base of the shaft 23, and an outer ring 43 is fitted to the base of the shaft 23. An inclined stopper surface 431 is formed corresponding to the inclined surface 38 of the hemispherical roller 3. Ru.

[0015] In the constant velocity joint of this embodiment configured as described above, the outer joint member 1 When rotates with the drive shaft, the rotational torque is applied to each spherical guide groove 12 and the tripod shaft. It is transmitted to the inner joint member 2 via the hemispherical roller 3 disposed between the driven The shaft 6 rotates at the same speed as the drive shaft. Furthermore, when an external force in the axial direction acts between the drive shaft and the driven shaft 6, the hemispherical roller 3 It rotates while sliding on the spherical part 25 of the tripod shaft 23, and also in the spherical guide groove 12. are guided and roll, thereby both the inner and outer joint members 2, 1 (drive shaft and driven shaft 6) is allowed to slide in the axial direction.

[0016] Then, when the drive shaft and driven shaft 6 are rotating, the joint angle of both changes. When an external force acts on the tripod shaft 23, as shown in FIG. It is in a state where it performs a swinging motion, and at this time the hemispherical roller 3 has a spherical surface in its fitting hole 36. It slides in the direction of angle change with the spherical part 25 of the tripod shaft 23 that comes in contact with it, and the By sliding in the direction of angle change with the spherical guide groove 12 that makes spherical contact with the outer circumferential surface 32. Therefore, angular displacement of both the inner and outer joint members 2, 1 (drive shaft and driven shaft 6) is allowed. In addition, the hemispherical roller 3 and the tripod generated due to the swinging motion of the tripod shaft 23 The relative displacement in the direction perpendicular to the axis 23 is due to the cylindrical fitting of the hemispherical roller 3. Absorbed by the sliding between the inner peripheral surface of the hole 36 and the spherical part 25 of the tripod shaft 23. It will be done. As a result, the thrust force generated due to the angular displacement between the drive shaft and the driven shaft 6 is reduced. In other words, the conventional tripod type constant velocity job as shown in FIGS. 4 and 5 In the case of an angle, when the drive shaft and the driven shaft 6a form a joint angle, the low The rubber member 3a cannot roll along the spherical guide groove 12a and is Due to this, the tripod shaft 23a, needle bearing 25a, and roller Slip occurs between the member 3a and the spherical guide groove 12a, generating a large thrust force. In contrast, in the case of the constant velocity joint of this embodiment, the hemispherical roller 3 is tripod. The spherical portion 25 of the card shaft 23 and the spherical guide groove 12 slide at the spherical contact portions, respectively. This allows angular displacement between the drive shaft and driven shaft 6, so a large thrust force can be generated. does not occur.

[0017] Note that when the change in the joint angle is large, the inclined surface 38 of the hemispherical roller 3 becomes flat. By coming into contact with the stopper surface 431 of the outer ring 43 of the ring member 4, the hemispherical roller The contact resistance between the hemispherical roller 3 and the tripod shaft 23 due to the rotation of the roller 3 is caused by the bearing part. It is relaxed through the material 4. As described above, the constant velocity joint of this embodiment is a joint between the drive shaft and the driven shaft 6. It is possible to reduce the thrust force that tends to occur when the angle changes.

[0018]

[Effect of the idea]

According to the constant velocity joint of the present invention, the spherical part provided at the tip of the tripod shaft and , has a hemispherical outer peripheral surface and a cylindrical fitting hole, and the fitting hole slides into the spherical part. Hemispherical rollers that are freely fitted and arranged so that they can roll in the spherical guide groove of the outer joint member It has a configuration that has a hemispherical shape when both the inner and outer joint members take the joint angle. The roller slides on the spherical part of the tripod shaft and the spherical guide groove at the respective spherical contact parts. As a result, the angular displacement is allowed, so the thrust force that is likely to occur at this time is reduced. can be reduced.

[Brief explanation of drawings]

FIG. 1 is a side view of a constant velocity joint according to an embodiment, viewed from the axial direction.

FIG. 2 is a sectional view taken along the line II-II in FIG. 1;

FIG. 3 is a sectional view corresponding to FIG. 2 when the joint angle is taken.

FIG. 4 is a front view of a conventional constant velocity joint as seen from the axial direction.

FIG. 5 is a sectional view taken along the line V-V in FIG. 4;

FIG. 6 is an explanatory diagram when the roller member moves in an arc along the spherical guide groove.

[Explanation of symbols]

1... Outer joint member 2... Inner joint member 3... Hemispherical roller 12... Spherical guide groove 23... Tripod shaft 25... Spherical part 36... Fitting hole

Claims (1)

[Scope of utility model registration request] Claim: 1. An outer joint member having a cylindrical shape with one end open and having a plurality of spherical guide grooves extending in the axial direction on the inner circumference;
an inner joint member having a plurality of tripod shafts disposed coaxially inside the outer joint member and having a spherical portion at the tip thereof, the spherical portion protruding into the spherical guide groove; a hemispherical roller having an outer circumferential surface and a cylindrical fitting hole, the fitting hole being slidably fitted to each of the spherical parts, and disposed to be able to roll in the spherical guide groove. A constant velocity joint characterized by: