KR101615937B1

KR101615937B1 - A constant velocity joint

Info

Publication number: KR101615937B1
Application number: KR1020150176358A
Authority: KR
Inventors: 오병기; 김효진
Original assignee: 서한산업(주); 한국프랜지공업 주식회사
Priority date: 2015-12-10
Filing date: 2015-12-10
Publication date: 2016-04-27

Abstract

The present invention relates to a constant velocity joint, wherein a constant velocity joint according to the present invention comprises: an outer ring connected to a main shaft connected to an engine and provided with a receiving portion having a track formed on an inner surface thereof; An inner ring having a center hole to which a driven shaft is connected, a roller provided so as to be able to slide along the track and having a roller groove formed in the receiving portion of the outer ring, and a roller groove formed between the roller groove of the roller and the inner ring groove And a ball rotatably received in the space.

Description

A constant velocity joint

The present invention relates to a constant velocity joint, and more particularly, to a constant velocity joint that has a compact structure by simplifying the structure and is easy to assemble.

Generally, a constant velocity joint is a joint used in the front axle of a front wheel drive vehicle. It is provided between a main shaft connected to the engine and a driven shaft that is not in a straight line, so that power transmission can be uniformly performed without changing the rotational angular velocity. Which is a connection part.

A Tripod Constant Velocity Joint is disclosed in Korean Patent No. 10-0741308. The tripod constant velocity joint includes an outer wheel integrally connected to a stub shaft, and a half shaft inserted into an inner track of the outer ring, a spider that is splined to a shaft and transmits power; three trunnions formed on the outer circumferential surface of the spider; and a stator that is inserted in the trunnion to absorb a relative motion generated between the tracks of the outer ring and trunnions And a roller assembly.

Here, the above-described roller assembly slides on the outer ring, guiding the plunging movement between the stub shaft and the half shaft, and the folding motion between the two shafts can be achieved by this plunging motion.

Specifically, the roller assembly comprises an inner roller, an outer roller, and a needle bearing disposed between the inner roller and the outer roller, the inner roller being disposed between the track of the outer ring and the trunnion of the spider formed at the end of the half shaft.

That is, the roller assembly has a plurality of rollers or bearings between the trunnion and the track so as to guide the plunging motion and transmit the power when the stub shaft and the half shaft are folded.

Therefore, it is very time-consuming to assemble the roller assembly having a plurality of components as described above. In particular, in the case of a tripod constant velocity joint, since three trunnions are provided, the roller assemblies must be assembled for each trunnion It takes a lot of time. Also, since it is necessary to precisely assemble the roller assembly having a plurality of components as described above, the productivity is very low.

1. Korean Patent No. 10-0741308

SUMMARY OF THE INVENTION It is an object of the present invention to provide a constant velocity joint having a simpler structure in order to solve the above problems.

It is another object of the present invention to provide a constant velocity joint which can be easily assembled by a simple and simple construction and can further reduce the assembling time.

It is still another object of the present invention to provide a constant velocity joint that has a simple structure and firmly connects a main coaxial shaft and a driven shaft and prevents malfunction.

According to another aspect of the present invention, there is provided an internal combustion engine comprising: an outer ring connected to a main shaft and provided with a receiving portion having a track on an inner surface thereof; A roller which is provided so as to be able to slide along the track and which has a roller groove formed in the receiving portion of the outer ring and a ball which is confined and rotatably held between the roller groove of the roller and the inner ring groove of the inner ring, And a constant velocity joint.

Here, the inner ring groove of the inner ring and the roller groove of the roller are each formed in a hemispherical shape to receive the balls. Further, the outer surface of the ball is substantially covered by the inner ring groove and the roller groove. At this time, the depths of the inner ring groove and the roller groove correspond to the radius of the ball, respectively.

Meanwhile, the inner ring grooves are formed at regular intervals along the outer periphery of the inner ring.

The roller includes a sidewall portion corresponding to a side surface of the track groove and inclined downwardly and an upper surface portion corresponding to a bottom surface of the track groove, wherein the diameter of the roller is larger Is formed.

According to the constant velocity joint of the present invention as described above, it is possible to replace the conventional trunnion with a ball and prevent the ball from being separated by a roller instead of a cage for restricting the release of the ball when torque is applied in a broken state, do.

Accordingly, in the constant velocity joint according to the present invention, the time and effort required to assemble the roller assembly can be reduced by adopting a single roller compared to a plurality of components of the conventional roller assembly, and further, So that the configuration of the constant velocity joint can be remarkably simplified.

Furthermore, the constant velocity joint of the present invention has a simple structure as described above, but prevents the balls from being separated by the inner ring and the roller, thereby firmly connecting the main shaft and the driven shaft, thereby preventing malfunction.

1 is a perspective view of a constant velocity joint according to the present invention,
Fig. 2 is an exploded perspective view of Fig. 1,
FIG. 3 is a perspective view showing a state in which a part of the outer ring is cut to show the internal structure in FIG. 1,
Fig. 4 is a front view of Fig. 1,
5 is a side cross-sectional view of Fig.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings.

However, it is to be understood that the present invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It is intended that the disclosure of the present invention be limited only by the terms of the appended claims.

Also, terms used herein are for the purpose of illustrating embodiments and are not intended to limit the invention.

In the present specification, the singular form includes plural forms unless otherwise specified in the specification. &Quot; comprises "and / or" comprising "used in the specification do not exclude the presence or addition of components other than the components mentioned.

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs.

Hereinafter, a constant velocity joint according to various embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an exploded perspective view of the constant velocity joint 100 according to the present invention, FIG. 2 is an exploded perspective view of FIG. 1, and FIG. 3 is a perspective view of a state in which a part of the outer ring 40 is cut, .

1 to 3, the constant velocity joint 100 includes an outer ring 40 connected to a main shaft (not shown) connected to an engine and providing a receiving portion 42 having a track 44 formed on an inner surface thereof, An inner ring 10 accommodated in a receiving portion 42 of the outer ring 40 and formed with an inner ring groove 14 along the outer periphery thereof and having a center hole 12 to which a driven shaft (not shown) A roller 20 having a roller groove 22 and a roller groove 22 of the roller 20 and an inner ring groove 14 of the inner ring 10 are provided so as to be able to slide along the track 44, And a ball 30 rotatably received therein.

Therefore, when the main coaxial shaft is rotated, power is transmitted in the order of the roller 20, the ball 30 and the inner ring 10, and the driven shaft described above rotates. When the driven shaft is bent with respect to the main coaxial shaft, the roller 20 moves along the track 44 in accordance with the folded state, whereby the total length of the main coaxial shaft and the driven shaft is increased or decreased. As described above, the adjustment of the power transmission distance (i.e., the sum length of the main shaft and the driven shaft) while the roller 20 is moving is called plunging.

On the other hand, the outer ring 40 is formed in a substantially cylindrical shape, and a main shaft for transmitting the drive force of the engine is connected to one side of the outer ring 40, and the other side of the outer ring 40 is opened to connect the driven shaft . The outer race (40) has a receiving portion (42) in which one side of the inner race (10) is received. A predetermined number of tracks 44 are formed in the longitudinal direction along the outer periphery of the accommodating portion 42, for example, as shown in the figure. The roller 20 is slidably disposed along the track 44. The roller 20 disposed on the track 44 performs a sliding motion along the track 44 while rolling.

The inner ring (10) is disposed in the receiving portion (42) of the outer ring (40). The inner ring 10 is formed with a center hole 12 to which a driven shaft is connected at its center, and an inner ring groove 14 is formed along the outer periphery thereof. A roller groove 22 is formed in the roller 20 provided along the track 44 of the outer ring 40. A ball 30 is received between the inner ring groove 14 and the roller groove 22 of the roller 20.

The roller 20 includes a side wall portion corresponding to a side surface of the track groove and formed to be inclined downwardly and an upper surface portion provided in a shape corresponding to a bottom surface of the track groove.

Here, it is preferable that the side wall portion is provided in a curved shape having a predetermined curvature on a predetermined surface thereof so as to reduce the degree of friction with the side wall surface of the track groove as much as possible and to cause smooth plunging.

Meanwhile, the upper surface portion is shown as being provided in a planar shape, but it is not limited thereto, and it may be provided in a curved shape. Furthermore, a predetermined step or projecting portion may be provided on the upper surface portion, and a groove may be formed on the bottom surface of the track groove correspondingly to the step or projecting portion.

It is preferable that the diameter of the roller is increased from the upper portion to the lower portion when the ball 30 is inserted into the roller groove 22 in which the ball 30 is received. To be supported.

4 is a front view of the constant velocity joint 100 according to the embodiment of the present invention, and FIG. 5 is a side sectional view of FIG.

4 and 5, the inner ring groove 14 of the inner ring 10 and the roller groove 22 of the roller 20 are each formed in a hemispherical shape so as to receive the balls 30.

The ball 30 is received between the inner ring groove 14 of the inner ring 10 and the roller groove 22 of the roller 20 so as to be prevented from being separated. In this case, the inner ring groove 14 and the roller groove 22 may be symmetrically hemispherical. So that the ball 30 can be easily inserted into the inner ring groove 14 and the roller groove 22 and the ball 30 can be easily removed during maintenance.

The shape, radius, or height of the inner ring groove 14 and the roller groove 22 such that the outer surface of the ball 30 is substantially entirely covered by the inner ring groove 14 and the roller groove 22 Can be determined. For example, the depth of the inner ring groove 14 and the roller groove 22 may correspond to the radius of the ball 30, respectively. When the ball 30 is not completely covered, the ball 30 is released from the restraint of the ball 30 during operation of the constant velocity joint 100, and the ball 30 may be released.

Here, 'substantially all covered' means that the ball 30 is completely covered by the inner ring groove 14 and the roller groove 22, and the constant velocity joint 100 is actually manufactured and assembled Or a part of the ball 30 may not be covered when the roller 20 is moved.

When the outer surface of the ball 30 is covered by the inner race groove 14 of the inner ring 10 and the roller groove 22 of the roller 20 as described above and the main shaft and the driven shaft are turned It is possible to prevent the ball 30 from coming off.

Meanwhile, the inner ring grooves 14 may be formed at regular intervals along the outer circumference of the inner ring 10. For example, as shown in the figure, three balls 30 are provided, and a track 44, a roller 20, and a roller 40, which are formed in the receiving portion 42 of the outer ring 40, And three inner ring grooves 14, respectively. In this case, the inner ring grooves 14 are formed at equal intervals along the outer circumference of the inner ring 10, and the track 44 provided along the inner surface of the receiving portion 42 of the outer ring 40 As shown in FIG.

On the other hand, in the case of a conventional tripod constant velocity joint, a trunnion is provided on the outer periphery of the spider, and a roller assembly including a plurality of rollers is assembled to each trunnion. However, the present invention does not have a complicated structure such as a conventional tripod constant velocity joint, and replaces a complicated roller assembly with a single roller 20 by omitting a conventional trunnion. The ball 30 is restrained by the inner race groove 14 of the inner ring 10 and the roller groove 22 of the roller 20 instead of the conventional cage to prevent the ball 30 from coming off. Therefore, it is possible to construct a very simple and compact structure as compared with the structure of the constant-velocity joint in the related art, and the time and effort required for assembling can be remarkably reduced.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be appreciated that one embodiment is possible.

Accordingly, the true scope of the present invention should be determined by the technical idea of the claims.

10 ... the inner ring
12 ... center hole
14 ... inner ring groove
20 ... roller
22 ... roller home
30 ... balls
40 ... paddle
42 ... accommodating portion
44 ... track
100 ... constant velocity joint

Claims

An outer ring connected to the main coaxial and providing a receiving portion having a track groove formed on an inner surface thereof;
An inner ring which is received in the receiving portion of the outer ring and is formed with an inner ring groove along the outer periphery and has a center hole to which the driven shaft is connected;
A roller that is slidable along the track groove and has an inner surface formed with a roller groove toward the inner ring groove; And
And a ball restrained and rotatably received between a roller groove of the roller and an inner ring groove of the inner ring,
The inner ring groove of the inner ring and the roller groove of the roller are each formed in a hemispherical shape so as to receive the ball,
The outer surface of the ball is entirely covered by the inner ring groove and the roller groove,
Wherein the roller includes a side wall portion corresponding to a side surface of the track groove and formed to be inclined downwardly and an upper surface portion provided in a shape corresponding to a bottom surface of the track groove,
The diameter of the roller is formed so as to become larger from the outer ring direction toward the inner ring direction,
And the peripheral surface of the roller groove and the peripheral surface of the inner ring groove of the outer surface of the inner ring are provided so as to be capable of being in contact with each other, and the curvature of the peripheral surface of the roller groove and the curvature of the peripheral surface of the inner- Constant velocity joint.

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The method according to claim 1,
And the depth of the inner ring groove and the roller groove correspond to the radius of the ball, respectively.

The method according to claim 1,
Wherein the inner ring groove is formed at regular intervals along the outer periphery of the inner ring.

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