JPH02163524A - Drive force transmitting device - Google Patents

Abstract

PURPOSE:To provide a compact light transmitting device while reducing the filling rate of high viscosity fluid by providing, in a rotor, annular defining wall bodies for defining a space section into a plurlaity of small arear in the inner and outer peripheral directions to enclose high viscosity fluid in the space section. CONSTITUTION:A rotary shaft 33 is rotatably journalled by a cylinder house 32 and a housing cap 31, and a operating piston 36 is provided on the side with a cylindrical space section 44. A rotary 42 is constituted of a rotor part 49, blate 45 and annular defining wall bodies 46. Said bodies 46 define the space section 44 into a plurlaity of small areas 47, 48 in the inner and outer peripheral directions. High viscosity fluid is enclosed in the space section 44. Thus, a compact light transmitting device is provided while the filling rate of high viscosity fluid is reduced.

Description

[Detailed description of the invention] <Industry> Second field of application> The present invention is a driving force transmission system that transmits rotational power between two relatively rotatable shafts when differential rotation occurs between the two shafts. It is related to the device.

<Prior art> In general, ni+, a four-wheel drive drive force transmission device that transmits torque between the rear wheels, a differential limiting drive force transmission device that transmits torque between left and right wheels, etc. , a clutch means for transmitting torque, a piston that operates the clutch means, and a pressure generating section that generates pressure according to the differential rotation of the front and rear wheels or the left and right wheels, and the generated pressure is applied to the piston. The clutch means is actuated to frictionally engage the clutch means.

By the way, with the main purpose of reducing the size and weight of the driving force transmission device, a space filled with a high viscosity fluid is provided on the side of the piston, a blade is housed in this space, and the blade is accommodated in the space by the differential rotation. By rotating the blades relative to each other, a high viscosity fluid is forcibly moved between two closely spaced surfaces, and the viscous friction of the high viscosity fluid generates pressure corresponding to the differential rotation, and this pressure is applied to the piston to drive the clutch. A driving force transmission device in which means are engaged is disclosed in Japanese Patent Application Laid-open No. 63
It is publicly known as described in JP-A-240429.

<Problem to be solved by the invention> In this type of driving force transmission device, the transmitted torque can be changed according to the differential rotation, so if the radius of the trembling is made thicker, the transmitted torque capacity can be increased, and it is possible to avoid getting stuck. However, there is a problem in that the device becomes larger and the mountability becomes worse.

By the way, in this type of driving force transmission device, it has been confirmed that if the radius of the blade is the same, the amount of protrusion of the blade, or in other words, the deviation, will be almost the same regardless of the radius of the central base of the blade. .

Zunawaji, as shown in Figures 3 and 4, the central base 1
As a result of investigating the pressure characteristics of both when the blades 3 with different radius 1 (1) are housed in the cylindrical space 2 formed in the housing and have a radius R2, and the blades 3 are rotated relative to each other within the space 2, it was found that the center Even in the case shown in Fig. 3, in which the radius R1 of the base 1 is large and the volume of the space (order area of the piston) is small, it was confirmed that the force acting on the piston is the same. In the case shown in the figure, the flow width of the high viscosity fluid flowing in the space is small due to the relative rotation of the blades, creating a vortex, which generates a higher pressure than the one shown in Fig. 4. it seems to do.

The present invention focuses on the fact that the pressure does not decrease even if the radius of the central base is increased and the amount of protrusion of the blade is decreased as described above, This system is designed to increase the thrust force of the screw by providing a pressure generating section, and consists of a clutch means arranged between two relatively rotatable shafts and transmitting 1 to 1 torque between the two shafts; In a driving force transmission device equipped with an operating piston for controlling transmission I and torque of the clutch means, a cylinder housing housing the operating piston is connected to one of the two shafts, and the other shaft is rotatably supported by the cylinder housing. A space is provided in the cylinder housing on the side of the actuating piston, and in this space there are provided a diametrical blade part that slides on the inner periphery of the cylinder housing and a circle concentric with the inner periphery of the cylinder housing. A rotating body is housed in which an annular partition wall that partitions the space into a plurality of small areas in the inner and outer circumferential directions is integrally formed with the blade, and a high viscosity fluid is sealed in the space.

With the configuration described in 1 above, the space in which hydraulic pressure is generated by the relative rotation of the blades is divided into a plurality of small areas on the outer circumference and the inner circumference by the annular partition wall. In the small area, there is no difference in the pressure generated even if the amount of protrusion of the blade from the annular partition wall is reduced, so the thrust acting on the actuating piston is increased by the pressure generated in the small area on the inner peripheral side. and the transmission torque is increased.

<Example> Hereinafter, an example of the present invention will be described based on the drawings. In FIG. 1, 30 is a driving force transmission device. Reference numeral 32 denotes a cylinder housing to which the negative end of the input shaft is connected. 31
indicates a housing cap that is integral with the cylinder housing 31, and the inside of the cylinder housing 32 is sealed thereby.

This cylinder housing 32 and housing cap 31
A rotating shaft 33 is rotatably supported concentrically with the cylinder housing 32. One end of an output shaft is coupled to the rotating shaft 33 .

A clutch lubricating oil 27 is sealed inside the cylinder housing 32, and the cylinder housing 3
On the inner periphery of the shaft 2, a plurality of outer revs 37 are arranged in parallel so as to be engaged in the rotational direction by splines and movable in the axial direction.

On the other hand, a plurality of inner plays 38 are engaged with each other in the rotational direction by splines on the outer periphery of the rotating shaft 33, and are arranged in parallel so as to be movable in the axial direction. These outer plates 37 and inner plates 1 to 38 are arranged alternately to constitute a multi-plate clutch 40 as a clutch means. In the cylinder housing 32, an actuating piston 36 is provided between the multi-disc clutch 40 and the cylinder housing 32 and is prevented from rotating by the cylinder housing 32.
The operating force of 6 is transmitted to the multi-disc clutch 40.

A cylindrical space 44 is provided between the working piston 36 and the cylinder housing 32, and a rotary body 42 having a wall thickness between the space 44 and the passageway is accommodated in this space 44. ing.

1. As shown in FIG. 2, the rotating body 42 has a rotor portion 49 with a radius that is spline-engaged with the rotating shaft 33 in the rotational direction;
A diametrically extending blade 45 with a radius R2 that protrudes diametrically from the rotor portion 49 and comes into sliding contact with the inner peripheral surface of the cylinder housing 32; An annular partition wall 46 with a radius R3 that partitions the space 44 into a plurality of small areas 47, 48 in the inner and outer circumferential directions.
It is 11 buildings.

High viscosity fluid such as silicone oil is sealed in the space 44, which is divided into inner and outer small areas 47 and 48 by the annular partition wall (*46).

With the above configuration, when the cylinder housing 32 and the rotating shaft 33 rotate differentially, the high viscosity fluid sealed in the space 44 is forced to move between the two closely spaced surfaces at a flow rate corresponding to the rotational speed difference. , and internal pressure is generated due to viscous friction with the end face of the cylinder housing 32. That is, for example, when the blade 45 rotates clockwise with respect to the cylinder housing 32 in FIG. 2, a high pressure distribution occurs on the 81 and 2 surfaces of the blade 45, and a low pressure distribution occurs on the B1.82 surface. This internal pressure presses the actuating piston 36 in a direction that presses against the multi-disc clutch 40, and performs a 1 to 1 torque transmission action.

By the way, in the present invention, the space portion 44 is divided into a plurality of small areas 47 and 48 in the inner and outer circumferential directions by the annular partition wall 46.

Therefore, the space 44 is subdivided into small areas by the small areas 47 and 48, and as mentioned above, the pressure generated in the small areas on the outer circumference is caused by the protrusion of the blade 45 from the annular partition wall 46. Since there is no difference in the generated pressure even if the amount is reduced, the thrust force applied to the actuating piston 36 is increased by the pressure generated in the small area 48 on the inner peripheral side. Therefore, even in the rotating member 41 having the same radius, the pressing force against the multi-disc clutch 40 is increased, and the transmitted torque is also increased.

Further, when the cylinder housing 32 and the rotating shaft 33 are not differentially rotated, no internal pressure is generated due to the high viscosity fluid in the space 44 consisting of the axial gap in which the rotating body 42 is housed, and the multi-plate Clutch 40 does not perform any torque transmission action.

In addition, in the embodiment 1, the clutch means is a multi-plate clutch 4.
0, but it is not necessarily limited to the multi-disc clutch 40.

<Effects of the Invention> As described above, the present invention has a method in which a high viscosity fluid is sealed on the side of an actuating piston that controls a clutch means that transmits torque between two relatively rotatable shafts by differential rotation between the two shafts. In the device, the actuating piston or the clutch means is pressed against the internal pressure of the high viscosity fluid generated in the space by the rotation of a rotating body housed in the space, wherein the rotating body is arranged in the space. An annular partition wall is provided to divide the interior into a plurality of small areas in the inner and outer circumferential directions, and the area within the space is subdivided, so that the pressure generated in the small areas on the inner circumferential side reduces the screw thrust. As a result, the generated l-lux increases, making it possible to reduce the diameter of the cylinder housing, making it more compact and lightweight, and reducing the filling rate of high-viscosity fluid into the space. Can be lowered.

[Brief explanation of the drawing]

The drawings show 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 ■-■ in FIG. 1, and FIG. 3 is a conventional oil generating means section. FIG. 1 is a cross-sectional view taken along the line ■--■ in FIG. 31... Housing cap, 32... Cylinder nose 1 housing, 33... Rotating shaft, 36... Operating piston, 40... Multi-disc clutch, 42... Rotating body, 44
... Space part, 45 ... Blade, 46 ... Annular partition wall body, 47.48 ... Small area, 49 ... Rotor part. Patent applicant Rinta Koki Co., Ltd.

Claims (1)

[Claims] A driving force transmission device comprising a clutch means disposed between two relatively rotatable shafts and transmitting torque between the two shafts, and an actuating piston controlling the transmission torque of the clutch means. A cylinder housing that accommodates the working piston is connected to the other side, and a rotating shaft rotatably supported on the cylinder housing is connected to the other side, a space is provided in the cylinder housing on the side of the working piston, and a space is provided in the cylinder housing on the side of the working piston. A diametrical blade portion that slides on the inner periphery of the cylinder housing, and an annular partition wall body that is concentric with the inner periphery of the cylinder housing and divides the space into a plurality of small areas in the inner and outer circumferential directions on the blade portion. A driving force transmission device characterized in that an integrally formed rotating body is housed, and a high viscosity fluid is sealed in the space.