JPH01312234A - Driving force transfer device - Google Patents

Abstract

PURPOSE:To prevent seizure of a multiple disc clutch and deterioration of lubricating oil, by forming a clutch hub from metal of good thermal conductivity e.g. aluminium when its inner plate and its outer plate are press-welded to each other to transfer driving force. CONSTITUTION:Pressure exerts on a ring-shaped piston 17, then an outer plate 15 and an inner plate 16 are pressedly welded to each other, and then driving torque transferred from an input shaft 8 to a housing 11 is transferred to an axis 10 of rotation and an output shaft 9 via a multiple disc clutch 14, when frictional heat is generated between the outer plate 15 and the inner plate 16; this frictional force is allowed to escape into a clutch hub 7 formed of aluminium so that heat is prevented from staying in the multiple disc clutch 14. Seizure of the multiple disc clutch and deterioration of lubricating oil may thus be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a driving force transmission device that transmits driving force between a cylindrical housing and a rotating shaft via a multi-plate clutch.

<Prior Art> As an example of such a driving force transmission device, a rotating shaft is rotatably supported on the inner periphery of a cylindrical housing, a clutch hub is provided on the outer periphery of the rotating shaft, and the clutch hub is engaged with the outer periphery of the clutch hub. A multi-disc clutch is constructed by alternately arranging a plurality of inner plates that engage with the inner circumferential surface of the housing and outer plates that engage with the inner circumferential surface of the housing, and an annular piston that presses the multi-disc clutch against the inner circumferential surface of the housing so that the annular piston cannot rotate relative to the inner circumferential surface of the housing. A housing cap slidably provided and coupled to the housing forms a gap between the annular piston, a rotor rotatably connected to the rotating shaft is provided in the gap, and blades extending in the radial direction are formed in the rotor. , there is one in which the gap is filled with high viscosity oil such as silicone oil. This thing is
Relative rotation occurs between the blade and the cylinder cap and the annular piston that form the gap, thereby forcibly moving the high viscosity oil in the gap to generate hydraulic pressure, and pressing the multi-disc clutch against the annular piston. applies force to press the inner plate and outer plate,
It was transmitting driving force.

<Problems to be Solved by the Invention> However, when the driving force is transmitted by pressing the inner plate and the outer plate into contact with each other as described above, frictional heat is generated between the inner plate and the outer plate. This frictional heat causes seizure of the multi-disc clutch and deterioration of the lubricating oil used to lubricate the multi-disc clutch.

<Means for Solving the Problems> The present invention was made to solve the above-mentioned problems.
The clutch hub is made of a metal with good thermal conductivity, such as aluminum.

<Function> Since the present invention has the above-described configuration, the frictional heat generated in the multi-disc clutch does not accumulate in the multi-disc clutch.
It is released from the multi-disc clutch to the clutch hub.

<Example> Embodiments of the present invention will be described below based on the drawings.

In FIG. 1, 10 is a rotating shaft, and 11 is a housing that rotatably supports this rotating shaft IO via a bearing 12. In FIG. A cylinder cap 13 is fixed to one end of this housing 11. A clutch hub 7 made of aluminum with good thermal conductivity is spline-fitted to the outer periphery of the rotating shaft.
A multi-disc clutch 14 is provided between the housing 11 and the housing 11 . This multi-plate clutch 14 includes a plurality of outer plates 15 rotationally engaged with grooves formed on the inner periphery of the housing 11, and an inner plate 16 rotationally engaged with grooves formed on the outer periphery of the clutch hub 7. are arranged alternately.

An annular piston 17 is fitted into the housing 11 so as to be non-rotatably but slidable in the axial direction.

A cylindrical gap 20 limited in the axial direction is formed on the side of the annular piston 17 between it and the end wall of the cylinder cap 13, and this gap 20 has a wall thickness slightly smaller than its axial dimension. A rotor 21 is slidably housed therein. The rotor 21 has its center portion spline-coupled to the outer periphery of the output shaft 10, and has a plurality of circumferentially extending blades 22 extending in the radial direction, as shown in FIG. As a result, the gap 20 between the annular piston 17 and the cylinder cap 13 is divided into a plurality of spaces on the circumference by a plurality of blades 22, and each of these spaces is filled with a high viscosity oil 23 such as silicone oil. .

Next, the operation will be explained based on the above configuration. The input shaft 8 and the output shaft 9 rotate relative to each other, and the rotor 21
When rotates within the housing 11, the high viscosity oil 23 filled in the gap 20 is forcibly moved by the blade 22 between the two closely spaced surfaces at a flow rate corresponding to the rotational speed difference. On this occasion,
Due to viscous friction between the cylinder cap 13 and both end surfaces of the annular piston 17, an internal pressure proportional to the rotational speed difference of the rotor 41 is generated within the gap 20. Therefore, when this pressure acts directly on the annular piston 17, the outer plate 15 and the inner plate 16 are brought into pressure contact, and the driving torque transmitted from the input shaft 8 to the housing 11 is transferred to the rotating shaft 10 via the multi-disc clutch 14. It is transmitted to the output shaft 9.

At this time, the outer plate 15 and the inner plate 16
During this time, frictional heat is generated, but this frictional heat is released to the clutch hub 7 made of aluminum, thereby preventing heat from accumulating in the multi-disc clutch 14. By forming the clutch hub 7 from aluminum in this manner, the temperature of the multi-disc clutch can be lowered as shown in FIG. 3, compared to the conventional clutch hub 7 formed from iron, as shown in FIG.

<Effects of the Invention> As described above, in the present invention, since the clutch hub is formed of a metal with good thermal conductivity such as aluminum, frictional heat is not trapped in the multi-disc clutch, and seizure of the multi-disc clutch is prevented. It also has the advantage of preventing deterioration of lubricating oil.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a sectional view of the driving force transmission device, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIG.
FIG. 3 is a diagram showing the temperature of a multi-disc clutch depending on the material of the clutch hub. 7... Clutch hub, '8... Output shaft, 9... Input shaft, 10... Rotating shaft, 11... Housing, 13
... Cylinder cap, 14 ... Multi-disc clutch, 1
7... Annular piston, 21... Rotor, 22...
Blade, 23...High viscosity oil.

Claims (1)

[Claims] (1) A rotating shaft is rotatably supported on the inner periphery of a cylindrical housing, a clutch hub is provided on the outer periphery of the rotating shaft, and an inner plate that engages with the outer periphery of the clutch hub and the inner periphery of the housing. A driving force transmission device in which a plurality of outer plates that engage with each other are arranged alternately to constitute a multi-disc clutch, and an annular piston that presses the multi-disc clutch is provided on the inner circumference of the housing so as to be non-rotatable but slidable relative to the housing. The driving force transmission device according to the invention, wherein the clutch hub is made of a metal with good thermal conductivity such as aluminum.