JPH0736188Y2 - Driving force transmission device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a driving force transmission device for transmitting driving force via a multi-plate clutch.

<Prior Art> As an example of such a driving force transmission device, a rotary shaft is rotatably supported on the inner circumference of a cylindrical housing, and an inner plate engaging with the outer peripheral surface of the rotary shaft and an inner peripheral surface of the housing are engaged. A plurality of outer plates are alternately arranged to form a multi-plate clutch, and an annular piston for press-contacting the multi-plate clutch is slidably provided on the inner circumference of the housing, and a housing cap and an annular piston coupled to the housing are provided. There is a type in which a rotor is rotatably connected to the rotary shaft, a blade extending in the radial direction is formed in the gap, and a high-viscosity oil such as silicon oil is filled in the gap. This is a multi-disc clutch in the annular piston, forcibly moving the high-viscosity oil in the gap by relative rotation between the blade and the cylinder cap forming the gap and the annular piston to generate hydraulic pressure. The pressing force was applied to press. In such a device, the amount of the gap between the annular piston and the cylinder cap is determined by fixing the cylinder cap to a predetermined position of the housing with a circlip.

<Problems to be solved by the invention> However, if the position of the cylinder cap is fixed to the predetermined position of the housing to determine the amount of the gap as described above, the position of the annular piston may be displaced due to an assembly error or the like. In that case, there is a problem in that the amount of highly viscous oil filled in the gap varies, resulting in variation in the transmission characteristics.

<Means for Solving Problems> The present invention has been made to solve the above-mentioned problems, and a cylinder cap is arranged on the inner circumference of the housing with a gap on the side of the annular piston, and on the outer circumference of the rotary shaft. A rotor to be rotationally connected is housed in the gap, a plurality of blades are provided on the circumference of the rotor, the gap is divided into a plurality of spaces on the circumference by the blades, and high-viscosity oil is enclosed in each of these spaces. Then, a cylindrical member fitted into the housing to form a certain amount of gap between the cylinder cap and the annular piston is interposed between the cylinder cap and the annular piston.

<Operation> Since the present invention is configured as described above, the gap can be maintained at a constant amount by assembling the cylindrical member so as to contact the annular piston and the cylinder cap, and the high viscosity oil is filled into the gap. The amount can be managed constantly.

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 14 is an output shaft, and a rotary shaft 13 is spline-fitted to the outer periphery of this output shaft. Reference numeral 10 denotes a housing that rotatably supports the rotating shaft 13 via a bearing 9. A cylinder cap 11 is fitted to one end of the housing 10 and prevented from coming off by the circlip 8, and an input shaft 12 is joined to the other end. The housing 10 and the cylinder cap 11 are provided with screw holes 1 and 2 for adjusting the amount of oil in the housing 10, and screws 3 and 4 are screwed together. A multi-plate clutch 17 is provided between the housing 10 and the rotary shaft 13, and the multi-plate clutch 17 includes a plurality of outer plates 15 rotatably engaged with the inner circumference of the housing 10 and a rotary engaging member on the outer circumference of the rotary shaft 13. The combined inner plates 16 are alternately arranged. An annular piston 18 is slidably inserted into the housing 10, and a space 30 surrounded by the annular piston 18 and the housing 10 is filled with the lubricating oil of the multi-plate clutch 17. On the side of the annular piston 18, a cylindrical clearance 20 is formed between the end wall of the cylinder cap 11 and the axial direction, and the clearance 20 is slightly smaller than the axial dimension of the clearance 20. The rotor 21 is stored rotatably. The rotor 21 has a central portion spline-engaged with the outer circumference of the rotary shaft 13 and has a plurality of circumferentially extending blades 22 as shown in FIG. As a result, the gap 20 between the annular piston 18 and the cylinder cap 11
Is divided into a plurality of spaces on the circumference by a plurality of blades 22, and each of these spaces is filled with high-viscosity oil such as silicone oil. As shown in FIG. 3, a cylindrical member 19 integrally formed with the cylinder cap 11 is fitted to the housing 10 on the outer circumference of the blade 22. This cylindrical member
19 has an axial length C, and by contacting the annular piston 18, the axial length of the gap 20 is kept at C.

The cylindrical member 19 may be integrally formed with the annular piston 18 or may be a member separate from them.

Next, the procedure for assembling the above-mentioned configuration will be described.

A rotary shaft 13 is rotatably mounted on the housing 10 by a bearing 9, and the outer circumference of the rotary shaft 13 and the housing 10
The inner plate 16 and the outer plate 15 are alternately spline-engaged with the inner periphery of the housing 10, and then the housing 10 is filled with the lubricating oil of the multi-plate clutch 17. Annular piston in housing 10
After inserting 18 a little, remove the screw 3 from the screw hole 1, insert the annular piston 18 until it comes into contact with the multi-plate clutch, and close the screw hole 1 with the screw 3. And the annular piston
After injecting highly viscous oil onto the upper surface of the rotor 18, the rotor 21 is spline-engaged with the rotating shaft 13. Then, place the cylinder cap 11 on the cylindrical member where the high-viscosity oil is filled around the blade 22.
Fit until the 19 contacts the annular piston 18. At this time, excess high-viscosity oil flows out from the screw hole 2. When the cylindrical member 19 comes into contact with the annular piston 18, the circlip 8 is fitted into the housing 10 to prevent the annular piston 18 from coming off. After that, the screw hole 2 is closed by the screw 4, the output shaft 14 is spline-engaged with the rotary shaft 13, the input shaft 12 is connected to the housing 10, and the assembly is completed.

Next, the operation of the driving force transmission device assembled as described above will be described. When the input shaft 12 and the output shaft 14 rotate relative to each other and the rotor 21 rotates in the housing 10, the high-viscosity oil filled in the clearance 20 is moved by the blade 22 depending on the rotational speed difference between the two adjacent surfaces. It is forcibly moved at a high flow velocity.
At this time, an internal pressure proportional to the rotational speed difference of the rotor 21 is generated in the gap 20 due to viscous friction between the cylinder cap 11 and both end surfaces of the annular piston 18. Therefore, this pressure directly acts on the annular piston 18, so that the plurality of outer plates 15 and inner plates 16 are brought into pressure contact with each other, and the driving torque transmitted from the input shaft 12 to the housing 10 is transmitted through the multi-plate clutch 17 to the rotating shaft. 13 and the output shaft 14 are transmitted.

<Effects of the Invention> As described above, in the present invention, by fitting the cylindrical member between the annular piston and the cylinder cap,
The gap between the annular piston and the cylinder cap can be made constant, and thus the high-viscosity oil filled in the gap becomes a constant amount, and there is an advantage that it is possible to prevent variations in torque transmission characteristics.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a sectional view of a driving force transmission device, FIG. 2 is a sectional view taken along the line II-II of FIG.
FIG. 3 is an enlarged sectional view showing a main part of the present invention. 10 ... Housing, 11 ... Cylinder cap, 12 ... Input shaft, 13 ... Rotation shaft, 14 ... Output shaft, 17 ... Multi-disc clutch, 18 ... Annular piston, 19 ... Cylindrical member, 20 ... … Gap, 21 …… Rotor, 22 …… Blade.

Claims (1)

[Scope of utility model registration request] 1. A cylindrical housing rotatably supporting a rotary shaft on an inner periphery thereof, a multi-plate clutch is arranged between the rotary shaft and the housing, and an annular piston for press-contacting the multi-plate clutch is provided. In the driving force transmission device, a cylinder cap is arranged on the inner circumference of the housing with a gap on the side of the annular piston, and a rotor rotatably connected to the outer circumference of a rotary shaft is housed in the gap. In order to form a certain amount of gap between the cylinder cap and the annular piston, a plurality of blades are provided in the space, the gap is divided into a plurality of spaces on the circumference by these blades, and highly viscous oil is sealed in each of these spaces. A driving force transmission device characterized in that a cylindrical member fitted into a housing is interposed between a cylinder cap and an annular piston.