JPH02142931A - Transmitting device for driving force - Google Patents

Abstract

PURPOSE:To interrupt the development of hydraulic pressure when temperature increases by providing a blade with an engaging member which is engaged and/or disengaged in the rotating direction, and thereby moving engaging member as temperature increases so as to disengage engaging member in a driving force transmitting device wherein internal pressure is developed within high viscous flowing fluid by the rotation of the blade so that a clutch is actuated. CONSTITUTION:When differential revolutions are made between a cylinder housing 32 and a rotating shaft 33, a blade 42 is relatively rotated against the cylinder housing 32, which situation permits high viscous flowing fluid enclosed within a space section 44 to be forcively moved so that internal pressure is developed by means of viscous friction between both end surfaces of the cylinder housing 32 and an operating piston 36. The operating piston 36 is pressed by the aforesaid pressure so as to let multi- branched clutches 40 come in contact with each other with pressure so that torque is transmitted. When temperature increases with differential revolutions continued, a temperature sensing member 48 is deformed, and an engaging member 41 is thereby moved while a spring 47 is being overcome so that the blade 42 is disengaged, which situation permits the relative revolution between the cylinder housing 32 and the blade 42 to be interrupted. Thus, the development of high pressure is suspended, and the occurrence of high friction heat is thereby prevented.

Description

Detailed Description of the Invention <Field of Application for Industry J-> 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> Generally, in a driving force transmission device for a four-wheel 11 @ drive that transmits torque between the front and rear wheels, or a driving force transmission device for differential limiting that transmits torque between the left and right wheels, etc. The system is equipped with 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 transferred to the piston. The clutch means is frictionally engaged.

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 opposite side of the piston, a blade is housed in this space, and the space is expanded by the differential rotation. By relatively rotating the blades within the unit, a high viscosity fluid is forcibly moved between two close 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. A driving force transmission device in which a clutch means is engaged is disclosed in Japanese Patent Application Laid-open No. 63
It is publicly known as described in Japanese Patent No.-240429.

<Problem to be Solved by the Invention> In this type of driving force transmission device: η, if high differential rotation continues for a long time, it is conceivable that the clutch will generate high frictional heat and burn out.

Means for Solving the Problems> The present invention has been made in view of the above problems.
That n'6! The configuration referred to as I is a driving force transmission device including a clutch means arranged between two relatively rotatable shafts and transmitting torque between the two shafts, and an actuating piston that controls the torque delivered by the clutch means. A cylinder housing housing the actuating piston is connected to one of the two shafts, a rotating shaft rotatably supported by the cylinder housing is connected to the other, and a space is provided in the cylinder housing on the side of the actuating piston. A blade is housed in the space, and a high viscosity fluid that is forcibly moved within the space by the blade during differential rotation between the cylinder housing and the rotating shaft is sealed in the space. An engaging member for engaging and disengaging the blade in the rotational direction is provided on either one of the shafts, and is integrally movable in the rotational direction and movable in the axial direction.
The blade is provided with a temperature sensitive member that moves the engaging member to disengage the engagement with the blade.

With the above configuration, the engaging member is normally placed in a position where it engages with the brake, and differential rotation generates hydraulic pressure to push the actuating piston, press the clutch, and transmit torque. However, as the differential rotation time becomes longer and the temperature rises, the temperature-sensitive member acts to move the engagement member, disengaging it from the blade, interrupting the blade's relative rotation with respect to the cylinder housing, and generating hydraulic pressure. Eliminate.

<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. 32 is a cylinder housing to which one end of the input shaft is connected. Reference numeral 31 denotes 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 .

Inside the cylinder housing 32, one clutch lubricating oil 27 is provided, and the cylinder housing 3
On the inner periphery of the shaft 2, a plurality of outer revving 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, on the outer periphery of the rotating shaft 33, a plurality of inner revvings 38 are engaged in the rotational direction by splines and arranged in parallel so as to be movable in the axial direction. These outer plates 37 and inner plates 38 are arranged alternately and constitute a multi-plate clutch 40 as a clutch q. Inside the cylinder housing 32, there is a housing cap 31 between the multi-disc clutch 40 and the cylinder housing 32 (in Japan, a housing cap 31
between the actuating piston 36 or the cylinder housing 32
The actuating force of the actuating piston 36 is transmitted to the multi-disc clutch 40.

A space 44 consisting of an axial gap is provided between the actuating piston 36 and the housing cap 31 (or between it and the cylinder housing 32). A diametrical vibration 42 having a wall thickness between 44 and the groove is housed.

On the other hand, on the outer periphery of the rotating shaft 33, an engaging member 41 that engages and disengages the blade 42 in the rotational direction is rotatable integrally with a pin 45 in the rotational direction, and a key mechanism that engages with the pin 45 in the axial direction. 46 so as to be movable. This engaging member 41 is always pushed to a position where it engages with the blade 42 by a spring 47, and a temperature sensitive member 48 such as a bimetal is installed on the opposite side from this spring 47. Further, a high viscosity fluid such as silicone oil is sealed in the space 44 .

With the above configuration, when the cylinder housing 32 and the rotation shaft 33 differentially rotate, the blade 42 engaged with the engagement member 41 rotates relative to the cylinder housing 32, and the The viscous fluid is forcibly moved by the blade 42 between the two closely spaced surfaces at a flow rate corresponding to the difference in rotational speed, and internal pressure is generated due to viscous friction with both end surfaces of the cylinder housing 32 and the actuating piston 36.

That is, for example, in FIG.
In contrast to 2, when the rotor 41 rotates clockwise, internal pressure is generated with a high pressure distribution on the A1.42 surface of the blade 42 and a low pressure distribution on the B1.82 surface. This internal pressure causes the actuating piston 3
6 is pressed in a direction that presses against the multi-disc clutch 40 and performs a torque transmission action.

Furthermore, when the cylinder housing 32 and the rotating shaft 33 are not differentially rotating, no internal pressure is generated due to the high viscosity fluid in the space 44 consisting of the axial gap in which the blade 42 is housed, and the multi-disc clutch 40 does not perform a torque transmission function.

If the differential rotation is large and continues for a long time, the temperature will rise due to frictional heat of the multi-disc clutch 40, etc. This temperature rise causes the temperature sensitive member 48 to deform, causing the engaging member 41 to move against the pressing force of the spring 47 and disengage from the blade 42, as shown in FIG. As a result, the relative rotation of the blade 42 with respect to the cylinder housing 32 is interrupted, and no oil pressure is generated. Therefore, the multi-plate clutch 40
The pressure welding force is relaxed and the generation of high frictional heat is suppressed. Furthermore, when the temperature drops, the temperature sensitive member 48 returns to its original shape, and the engaging member 41 is moved by the spring 47 to engage with the blade 42, thereby generating oil pressure again during differential rotation.

In addition, in the above-mentioned repair example, the engaging member 41, the spring 47,
Although the temperature sensitive member 48 is provided on the rotating shaft 33 side, it may also be provided on the cylinder housing 32 (Fl).

Further, the clutch means may be configured as a multi-disc clutch 40, but is not necessarily limited to the multi-disc clutch 40.

<Effects of the Invention> As described above, the present invention provides a high viscosity fluid on the side of the actuating piston that controls the clutch means that transmits torque between two relatively rotatable shafts by differential rotation between the two shafts. An enclosed space is provided, and the actuating piston presses against the clutch means by the internal pressure caused by the high viscosity fluid generated in the space by the rotation of the blade housed in the space, in which either one of the two shafts is used. an engaging member for engaging and disengaging the blade in the rotational direction is provided integrally in the rotational direction and movable in the axial direction;
Since the composition includes a temperature sensitive member that moves the engaging member to disengage from the blade due to a rise in temperature, oil FF generation is immediately interrupted when the temperature rises due to high differential rotation. This has the advantage that the clutch does not generate abnormal heat even if high differential rotation continues for a long time, preventing abnormal wear and burnout of the clutch.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 is a sectional view of the driving force transmission device, FIG. 2 is a sectional view taken along the line ■-■ in FIG. It is a diagram. 31... Housing cap, 32... Cylinder housing, 33... Rotating shaft, 36... Operating piston, 40... Multi-disc clutch, 41... Engaging member, 42
...Blade, 44...Space, 47...Spring, 48...Temperature sensitive member.

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, a rotating shaft rotatably supported by the cylinder housing is connected to the other side, and a space is provided in the cylinder housing on the side of the working piston,
A blade is housed in this space, and a high viscosity fluid that is forcibly moved within the space by the blade during differential rotation between the cylinder housing and the rotating shaft is enclosed in the space, and a high viscosity fluid is forcibly moved within the space by the blade when the cylinder housing and the rotating shaft rotate differentially. An engaging member for engaging and disengaging from the blade in the rotational direction is provided integrally in the rotational direction and movable in the axial direction, and a temperature sensitive member is provided for moving the engaging member to disengage the engagement with the blade due to temperature rise. A driving force transmission device characterized by comprising: