JPS606667Y2 - spline structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spline structure used to connect a clutch disk and a shaft of a friction clutch device.

As a conventional spline structure, there is one shown in FIG. 1, for example.

That is, FIG. 1 shows a hub a of a clutch disc and an input shaft of a transmission. An inner spline C is provided in the inner hole of the hub a, and an outer spline d is provided in the input shaft of the transmission, so that both are splined. They are mated.

However, in such a conventional spline structure, in order to smoothly slide the clutch disk, that is, the hub a, in the axial direction when connecting and disengaging the clutch device, grease is applied between both splines. However, when torque is applied from the clutch disc, the grease between the tooth surfaces of the rain spline is pushed out to both sides of the hub, so if grease is not constantly supplied, lubrication will be insufficient and the clutch disc will There was a problem in that the sliding was poor and the clutch became difficult to disengage.

In order to solve this problem, it is conceivable to provide an annular groove perpendicular to the spline in the spline hole of the hub and store the extruded grease in the annular groove.

However, if only the annular groove is provided in this way, spline teeth will remain between the annular groove and the end surface of the hub, so when the hub is fitted onto the input shaft, or during clutch switching, the hub may When sliding in the axial direction, the grease applied between the two may be scraped off by the remaining spline teeth, and this scraped grease may be stored in the annular groove, due to insufficient grease storage. Lubrication of the spline structure cannot be maintained unchanged for a long time.

The present invention was developed by focusing on these conventional problems, and when torque is applied from the clutch disc and the grease between the tooth surfaces of both splines is pushed out to both sides of the hub, it is possible to transfer the grease to the hub side. By housing the hub in the annular groove provided and preventing it from scattering to the outside, it also prevents it from being scraped by the hub when it is mated to the input shaft, and when the hub slides on the input shaft during clutch engagement/disengagement switching. It is an object of the present invention to solve all of the above problems by making it possible to store the grease contained in the annular groove in the annular groove.

This invention will be explained below based on the drawings.

FIGS. 2 and 3 are diagrams showing an embodiment in which this invention is applied to a clutch hub.

First, the configuration of the clutch device will be explained. In FIG. 1, a clutch disc 4 is provided between a flywheel 2 driven by an engine crankshaft 1 and a pressure plate 3, and this clutch disc 4 is connected to a hub on the inner circumference of the flywheel 2. 5 to the input shaft 6 of the transmission.

The clutch disc 4 and the clutch hub 5 are connected by sandwiching the flange 5a of the clutch hub 5 between the hub-side plates 4a and 4b of the clutch disc 4, and the plates 4a and 4b.
The drive connection is made in the rotational direction via a torsional damper spring 7 provided in the.

In addition, 8 is a clutch cover, 9 is a diaphragm spring that brings the clutch into the engaged state, and the diaphragm spring 9 connects the pressure plate 3 to the flywheel 2.
It's pressed to the side.

As a result, the facing 4C of the clutch disc 4 is sandwiched between the pressure plate 3 and the flywheel 2,
A clutch connected state is obtained in which the clutch disc 4 rotates together with the flywheel 2, and the input shaft 6 of the transmission can be driven via the clutch hub 5.

In addition, when releasing the clutch, by pressing the center part of the diaphragm spring 9 to the left in FIG.
Retract the pressure plate 3 and remove the clutch disc 4.
When the clutch disc 4 is released and the clutch disc 4 is slightly separated from the flywheel 2, power is no longer transmitted to the input shaft 6 of the transmission.

In the present invention, as clearly shown in FIG.
are arranged near both ends of the spline hole 5b, respectively, and
Make it deeper than the tooth height of the spline.

Then, all the spline teeth between the annular rings i5c, 5d and the corresponding adjacent end surfaces of the clutch hub 5 are removed, and smooth inner circumferential surfaces 5e having the same diameter as the root diameter of the spline teeth are provided inside both ends of the clutch hub 5. Set 5f.

In this embodiment, when fitting the clutch hub 5 to the input shaft 6 of the transmission, grease is applied to both of them.
The grease on the input shaft 6 is scraped off, and the scraped grease is stored in the annular groove 5d.

Note that this action is caused by the clutch hub 5 during the clutch disengagement action.
is obtained in the same way when sliding on the input shaft 6 to the right in FIG.

Furthermore, when the clutch hub 5 slides on the input shaft 6 to the left in FIG. 2 during clutch engagement, the grease on the input shaft 6 is scraped off by the spline end 5h near the annular groove 5c. The removed grease is stored in the annular groove 5c.

When torque is applied from the clutch hub 5, the grease built in between the tooth surfaces of both splines is applied to the clutch hub 5.
The annular groove 5C is pushed out laterally.

5d are located near both side surfaces of the clutch hub 5, all of the grease pushed out as described above is stored in the annular 'tR5ct5d.

Therefore, a large amount of grease is always stored in the annular shapes i5c and 5d, and the spline structure can be lubricated by the stored grease over a long period of time.

Thus, as described above, the spline structure of the present invention has annular grooves 5c and 5d arranged near both ends of the spline hole 5b on the hub 5 side, respectively, and spline teeth between these annular grooves and the corresponding adjacent end surface of the hub 5. Since the structure eliminates all of the
When the hub 5 lubricates the shaft 6, the lubricant scraped off by the hub can also be stored in the annular grooves i5c and 5d, and the amount of lubricant stored in these annular grooves is always kept large to ensure good lubrication of the spline structure. It can be maintained unchanged for a long time.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional spline structure, FIG. 2 is a sectional view of a clutch device having the spline structure of the present invention, and FIG. 3 is a sectional view of a hub in the same device. 1...Crankshaft, 2...Flywheel, 3...Pressure plate, 4...
...Clutch disc, 5...Clutch hub, 5b...Spline hole, 5c, 5d...
...Annular groove, 5e, 5f...Spline tooth removal surface, 6...Input shaft.

Claims (1)

[Scope of utility model registration request] In a spline structure consisting of a hub and a shaft that mesh with each other via spline teeth, an annular groove for storing lubricant is provided near both ends of a spline hole on the hub side, each substantially orthogonal to the spline and deeper than the tooth height of the spline, All the spline teeth between these annular grooves and the corresponding adjacent end surface of the hub are removed, and a smooth inner circumferential surface having the same diameter as the root diameter of the spline teeth on the hub side is formed between the annular groove and the adjacent end surface of the hub. A spline structure characterized by forming.