JPH08254217A - Driving shaft - Google Patents

Abstract

PURPOSE: To perform uniform grease supply over whole spline teeth by forming a deep hole extending from an end surface of a male member along a center axis and holes extending in the diametrical direction from the deep hole, and supplying grease from a grease supply means provided on the male member to the deep hole. CONSTITUTION: A deep hole 4 extends from an end surface of a male member 1 along a center axis. Plural diametral holes 5 extend from the deep hole is bored to a peripheral surface of a spline in a separating form from each other in an axial direction. A female member 2 is provided with a grease supply pipe 7 inserted into the deep hole 4 of the male member and grease supply means having a grease supply nipple 3 for supplying grease to the pipe. An inner surface of a base end area adjacent to a spline of the female member 2 is a conical tapered surface 2C which is widened toward to the spline. A seal device 8 which seals the deep hole 4 around the grease supply pipe 7 is provided on an end surface of the male member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive shaft composed of a male shaft member and a female shaft member each having a spline portion for spline fitting.

[0002]

2. Description of the Related Art In such a conventional drive shaft, a greasing nipple 3 is provided on the outer peripheral surface of a female member 2 for accommodating a male member 1, as shown in FIG. I had lubricated the spline teeth.

[0003]

However, in the conventional greasing by this method, it was not always possible to uniformly greas all the spline teeth, and only lubrication with a large unevenness could be achieved.

Therefore, it is an object of the present invention to provide a drive shaft which is able to lubricate all spline teeth almost uniformly at all times.

[0005]

In order to achieve this object, a drive shaft according to the present invention comprises a deep hole extending in an axial direction from an end face of the male member along a central axis in the male member, and the depth of the deep hole. A plurality of radial holes that are axially separated from each other and extend in the radial direction to the peripheral surface of the spline, and the female member has a greasing pipe that projects into a deep hole of the male member, and the greasing pipe. A greasing means including a greasing nipple for greasing the pipe is provided, and the inner surface of the proximal end region adjacent to the spline portion of the female member is a conical taper surface that expands toward the spline portion, A sealing device for sealing the deep hole around the greasing pipe is provided on an end surface of the shaped member.

[0006]

According to the present invention, grease is supplied from the greasing means provided on the female member to the deep hole provided along the central axis of the male member. This deep hole functions as a sump. A plurality of radial holes axially separated from the deep hole and extending radially to the circumferential surface of the spline guides the grease radially outward from the deep hole to the spline tooth surface when the drive shaft rotates. To act. The conical tapered surface adjacent to the spline portion of the female member serves to return the grease flowing out from the spline tooth toward the spline tooth again.

[0007]

The preferred embodiments of the present invention will now be described with reference to the drawings.

FIG. 2 shows a drive shaft D of the present invention as compared with the conventional example of FIG. FIG. 3 shows an enlarged detail of FIG.
The end of the female member is provided with a sealing device S that engages with the neck of the male member.

As shown in FIG. 3, a deep hole 4 is provided from the end face of the male member 1 along the central axis. A plurality of radial holes 5 are provided axially separated from the deep hole 4. The radial holes 5 preferably penetrate to the individual spline teeth or the peripheral surface of the valley between the spline teeth.

The female member 2 is provided with a greasing nipple 3 at the center of a base-side closed partition wall 6 of the internal space 2A of the female member. From this greasing nipple, a greasing pipe 7 is projected into the deep hole 4 of the male member through the internal space 2A and the sealing device 8 provided on the end face of the deep hole of the male member along the central axis.

The inner surface of the proximal region adjacent to the spline portion 2B of the female member 2 is formed as a conical taper surface 2C which expands toward this spline portion.

The grease 9 supplied from the greasing nipple 3 provided on the female member is fed from the greasing pipe 7 to the deep hole 4 of the male member 2.
And introduced into the radial bore 5. This deep hole 4 functions as an oil sump. Therefore, according to the present invention, the space between the sealing device S at the end of the female member and the neck of the male member and the proximal end space of the internal space of the female member function as an oil sump. The structure has a built-in oil sump inside the shaped member.

When the drive shaft D rotates, the grease 9 directly and sufficiently spreads to the radially outer spline tooth surfaces by centrifugal force. The grease that has deviated from the spline portion and has flowed into the space on the proximal end side of the internal space is along the conical tapered surface 2C under the action of the conical tapered surface 2C of the female member, as shown by the arrow in FIG. Then, it returns to the spline portion again to prevent the spline tooth surface from running out of oil.

[0014]

According to the present invention, the grease can be uniformly supplied to each spline tooth surface directly from the deep hole along the central axis of the male member through the radial hole by centrifugal force, so that uniform lubrication can be achieved. The effect that the life of the spline can be lengthened is obtained.

Further, the grease that has deviated from the spline portion by the conical taper surface of the inner surface of the base end region adjacent to the spline portion of the female member is returned to the spline tooth surface along this taper surface again, and seizure of the spline portion occurs. Can be prevented.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view showing a conventional drive shaft.

FIG. 2 is a side view showing a partial cross section of a drive shaft according to the present invention.

FIG. 3 is a side view showing an enlarged detail of FIG. 2 with a partial cross section.

[Explanation of symbols] 1 Male member 2 Female member 2A Internal space 2B Spline part 2C Conical taper surface 3 Greasing nipple 4 Deep hole 5 Radial hole 6 Base side closed bulkhead 7 Greasing pipe 8 Sealing device 9 Grease

Claims (2)

[Claims] 1. A drive shaft comprising a male shaft member and a female shaft member each having a spline portion for spline fitting, wherein a depth extending from the end face of the male member in the axial direction along a central axis line in the male member. A hole and a plurality of radial holes axially separated from the deep hole and extending in the radial direction to the peripheral surface of the spline are provided, and the female member is rubbed into the deep hole of the male member. A conical taper is provided which is provided with a greasing means including a pipe and a greasing nipple for greasing the greasing pipe, and which enlarges the inner surface of the proximal region adjacent to the spline part of the female member toward the spline part. A drive shaft comprising a surface and a sealing device for sealing the deep hole around the greasing pipe on the end surface of the male member. 2. The drive shaft according to claim 1, wherein the greasing nipple is provided at the center of the base-side closed partition wall of the internal space of the female member.