WO2019050054A1

WO2019050054A1 - Drive shaft for vehicle

Info

Publication number: WO2019050054A1
Application number: PCT/KR2017/009691
Authority: WO
Inventors: 서종욱; 장달수
Original assignee: 이래에이엠에스 주식회사
Priority date: 2017-09-05
Filing date: 2017-09-05
Publication date: 2019-03-14

Abstract

A drive shaft comprises: an in-board joint; an out-board joint; an outer housing one end of which is connected to an inner joint member of the in-board joint, and the other end of which is provided with a longitudinal bore; an inner shaft one end of which is inserted into the bore, and the other end of which is connected to an inner joint member of the out-board joint; and a ball spline structure connecting the inner shaft and the outer housing so as to enable the relative movements of the inner shaft and the outer housing in the length direction.

Description

The drive shaft of the vehicle

The present invention relates to a drive shaft used in a drive system of a vehicle.

The drive shaft used in the drive line of the vehicle includes an intermediate shaft and a constant velocity joint installed on each side of the intermediate shaft.

The intermediate shaft of the drive shaft may be constituted by a shaft having a plunging function, and an intermediate shaft having such a plunging function generally uses a ball spline structure.

The intermediate shaft having the plunging function includes an outer housing, an inner shaft, and a ball spline structure interposed therebetween. The ball spline structure is composed of an outer ball groove formed on the inner surface of the outer housing, an inner ball groove formed on the outer surface of the inner shaft, a plurality of balls arranged in the ball grooves, and a ball cage accommodating a plurality of balls. At this time, the inner shaft is connected to the inner joint member of the in-board joint and the outer housing is connected to the inner joint member of the out-board joint.

In such an intermediate shaft structure, it is advantageous that the diameter of the member connected to the outboard joint, that is, the diameter of the outer housing is small. Since the outer housing connected to the outboard joint has a thin hollow cylinder shape, There is a limit in diameter reduction.

[Prior Art Literature]

US Patent No. 6,585,602 (registered on July 01, 2003)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a drive shaft in which the diameter of a member connected to an outboard joint from an intermediate shaft having a plunging function of a ball spline structure can be easily reduced.

A drive shaft according to an embodiment of the present invention includes an in-board joint, an out-board joint, one end connected to an inner joint member of the inboard joint, and the other end connected to a longitudinal bore an inner shaft having one end inserted into the bore and the other end connected to an inner joint member of the outboard joint, and an outer shaft having an inner shaft and an outer housing, And a ball spline structure connecting the inner shaft and the outer housing to each other.

Wherein the ball spline structure includes a plurality of outer ball grooves extending in the longitudinal direction and extending in the longitudinal direction and being paired with the plurality of outer ball grooves to form a plurality of ball tracks on the outer surface of the inner shaft A plurality of balls disposed in the ball track so as to be movable in the longitudinal direction, and a plurality of balls accommodated in the ball track and interposed between the inner shaft and the outer housing so as to be movable in the longitudinal direction And may include a ball cage in the form of a sleeve.

The inner shaft may include a first end connected to the inner joint member of the outboard joint and a second end formed with the inner ball groove, the diameter of the first end being greater than the diameter of the second end . &Lt; / RTI >

The inner shaft may further include an intermediate portion disposed between the first end portion and the second end portion and the diameter of the intermediate portion is formed to be larger than the diameter of the first end portion and smaller than the diameter of the second end portion .

The inboard joint and the outboard joint may each be a Rzeppa joint.

Meanwhile, an intermediate shaft of a drive shaft having an inboard joint and an outboard joint according to an embodiment of the present invention is configured such that one end thereof can be connected to an inner joint member of the inboard joint, and the other end thereof is connected to a longitudinal bore an inner shaft having one end inserted into the bore and the other end connected to an inner joint member of the outboard joint, and an outer shaft having an inner shaft and an outer housing, And a ball spline structure connecting the inner shaft and the outer housing so as to be movable.

According to the present invention, by connecting the outer housing to the inboard joint in a drive shaft having a plunging function using a ball spline structure and connecting the inner shaft to the outboard joint, the inner shaft connected to the inner joint member of the outboard joint The reduction of the diameter of the end portion is facilitated.

1 is a schematic perspective view of a drive shaft according to an embodiment of the present invention.

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

3 is a cross-sectional view of an inner shaft of a drive shaft according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2, the drive shaft 1 has an in-board joint 2 and an out-board joint 3. The inboard joint 2 and the outboard joint 3 may be a constant velocity joint capable of rotating power transmission and turning, and may be, for example, a Rzeppa joint.

Referring to FIG. 2, the inboard joint 2 includes an outer joint member 21 and an inner joint member 22. The outer joint member 21 is formed so that one side thereof is opened to form a space for accommodating the inner joint member 22. A plurality of outer ball grooves 211 are formed on the inner surface of the outer joint member 21 and inner ball grooves 221 corresponding to the outer ball grooves 211 are formed on the outer surface of the inner joint member 22. A ball track is formed by a combination of an outer ball groove 211 and an inner ball groove 221 and a ball 24 which functions as a torque transmission is disposed on the ball track. A ball cage 23 is interposed between the outer joint member 21 and the inner joint member 22 in a state in which the ball 24 is received. For example, the number of ball tracks may be six, eight, and so on. Similarly, the outboard joint 3 also includes an outer joint member 31 having an outer ball groove 311, an inner joint member 33 having an inner ball groove 321, a ball 34, and a ball cage 33, .

The inboard joint 2 and the outboard joint 3 are connected to each other by an intermediate shaft. The intermediate shaft is configured to have a plunging function using a ball spline structure, and includes an outer housing 6, an inner housing 7, and a ball spline structure. At this time, boots 4 and 5 surrounding the open sides of the inboard joint 2 and the outboard joint 3, respectively, may be provided.

One end 61 of the outer housing 6 is connected to the inner joint member 22 of the inboard joint 2 and has a bore 63 in the longitudinal direction of the other end 62. The end 61 of the outer housing 6 is fastened to the inboard joint member 22 to rotate with the inner joint member 22 of the inboard joint 2 and is secured to the inboard joint member 22 by, (222) of the base plate (22).

One end portion 71 of the inner shaft 7 is inserted into a bore 63 provided at an end portion 62 of the outer housing 6 and the other end portion 73 is inserted into an inner joint Is fastened to the inner joint member (32) to rotate with the member (32). 2, the end portion 71 of the inner shaft 7 inserted into the outer housing 6 and the end portion 73 fastened to the inner joint member 32 of the outboard joint 3 are in the middle (72).

The ball spline structure 8 connects the inner shaft 7 and the outer housing 6 so that the inner shaft 7 and the outer housing 6 can move relative to each other in the longitudinal direction. The ball spline structure 8 includes a plurality of outer ball grooves 81 extending longitudinally in the bore 63 of the outer housing 6 and a plurality of outer ball grooves 81 extending in the longitudinal direction on the outer surface of the inner shaft 7 A plurality of inner ball grooves 82, a plurality of balls 83, and a ball cage 84.

The outer ball groove 81 is formed in the bore 63 of the outer housing 6 in the longitudinal direction. The outer ball groove 81 may be recessed radially outward on the surface forming the bore 63, and may have a semicircular cross-sectional shape. The outer ball groove 81 may be extended from the open end of the outer housing 6 by a predetermined length. The plurality of outer ball grooves 81 may be arranged at regular intervals along the circumferential direction, for example, six outer ball grooves 81 may be formed.

A plurality of inner ball grooves 82 are paired with a plurality of outer ball grooves 81 of the outer housing 6 to form a plurality of ball tracks. The inner ball groove 82 may be recessed radially inward from the surface of the inner shaft 7 and may have a semicircular sectional shape. The inner ball groove 82 may be formed at a position corresponding to the position of the outer ball groove 81 to form a tubular ball track. At this time, the inner ball groove 82 can be extended from the tip of the inner shaft 7 inserted into the bore 63 of the outer housing 6 by a predetermined length.

A plurality of balls 83 are arranged in a line on a ball track formed by the outer ball groove 81 and the inner ball groove 82. [ At this time, the ball 83 is arranged to be movable in the longitudinal direction.

The ball cage 84 has a sleeve shape and is interposed between the outer housing 6 and the inner shaft 7. The ball cage 84 accommodates a plurality of balls 83 and is disposed movably in the longitudinal direction.

3, the diameter D1 of the end portion 73, which is connected to the inner joint member 32 of the outboard joint 3, of the both

side ends

71 and 73 of the inner shaft 7, Is smaller than the diameter (D2) of the end portion (71) where the groove (82) is formed. 3, the diameter of the intermediate portion 72 disposed at the middle of both

end portions

71 and 73 is smaller than the diameter of the end portion 73 connected to the inner joint member 32 of the outboard joint 3, And the diameter D2 of the end portion 71 in which the inner ball groove 82 is formed is larger than the diameter D1 of the inner ball groove 82. [ Thereby, the diameter of the inner shaft 7 can be reduced stepwise, so that the structural strength can be improved and manufacturing is facilitated.

The drive shaft can be made compact by reducing the diameter of the member connected to the inner joint member of the outboard joint from the drive shaft. In contrast, in the embodiment of the present invention, the outer housing is provided on the side of the inboard joint And the inner shaft is disposed on the outboard joint side, an inner shaft, which can be formed to have a smaller diameter than the housing, is connected to the outboard joint so that the end portion of the inner shaft connected to the inner joint member of the outboard joint is formed to have a desired diameter It is easy to reduce the amount of

While the present invention has been particularly shown and described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And all changes and modifications to the scope of the invention.

The present invention relates to a drive shaft of a vehicle and is industrially applicable.

Claims

An in-board joint,

Out-board joint,

An outer housing having one end connected to the inner joint member of the inboard joint and the other end having a longitudinal bore,

An inner shaft having one end inserted into the bore and the other end connected to an inner joint member of the outboard joint,

And a ball spline structure connecting the inner shaft and the outer housing such that the inner shaft and the outer housing can move relative to each other in the longitudinal direction.
The method of claim 1,

The ball spline structure

A plurality of outer ball grooves extending in the longitudinal direction and provided in the bore,

A plurality of inner ball grooves formed on an outer surface of the inner shaft so as to form a plurality of ball tracks in a pair with the plurality of outer ball grooves,

A plurality of balls disposed on the ball track so as to be movable in the longitudinal direction, and

And a sleeve-shaped ball cage for receiving the plurality of balls and interposed between the inner shaft and the outer housing so as to be movable in the longitudinal direction.
The method of claim 1,

Wherein the inner shaft includes a first end connected to the inner joint member of the outboard joint and a second end formed with the inner ball groove,

And the diameter of the first end is smaller than the diameter of the second end.
4. The method of claim 3,

Wherein the inner shaft further includes an intermediate portion disposed between the first end and the second end,

And the diameter of the intermediate portion is formed to be larger than the diameter of the first end portion and smaller than the diameter of the second end portion.
The method of claim 1,

Wherein the inboard joint and the outboard joint are Rzeppa joints, respectively.
An intermediate shaft of a drive shaft having an inboard joint and an outboard joint,

An outer housing having one end connected to the inner joint member of the inboard joint and the other end having a longitudinal bore,

An inner shaft having one end inserted into the bore and the other end connected to an inner joint member of the outboard joint,

And a ball spline structure connecting the inner shaft and the outer housing such that the inner shaft and the outer housing can move relative to each other in the longitudinal direction.
The method of claim 6,

The ball spline structure

A plurality of outer ball grooves extending in the longitudinal direction and provided in the bore,

A plurality of inner ball grooves formed on an outer surface of the inner shaft so as to form a plurality of ball tracks in a pair with the plurality of outer ball grooves,

A plurality of balls disposed on the ball track so as to be movable in the longitudinal direction, and

And a ball cage in the form of a sleeve that receives the plurality of balls and is interposed between the inner shaft and the outer housing so as to be movable in the longitudinal direction.
The method of claim 6,

Wherein the inner shaft includes a first end connected to the inner joint member of the outboard joint and a second end formed with the inner ball groove,

And the diameter of the first end is smaller than the diameter of the second end.
9. The method of claim 8,

Wherein the inner shaft further includes an intermediate portion disposed between the first end and the second end,

And the diameter of the intermediate portion is formed to be larger than the diameter of the first end portion and smaller than the diameter of the second end portion.
The method of claim 6,

Wherein the inboard joint and the outboard joint are Rzeppa joints, respectively.