JPH02199332A - Driving force transmission mechanism - Google Patents

Abstract

PURPOSE:To attempt increase of torque transmission capacity without enlarging the size of a device by arranging a speed-increase mechanism between a blade and a rotation axis which increases the speed of differential rotation and transmits it to blades at the time of differential rotation of two axes. CONSTITUTION:A speed-increase mechanism 30 comprising an epicyclic gear is arranged between a housing 13 and a rotation axis 14 and increases speed and rotates blades 27 at relative rotation of the both. When relative rotation is generated between two axes 11 and 12, the blades 27 is relatively rotated against the housing 13, high viscosity fluid 29 filled in a pressure chamber 28 is forcibly moved between two opposing surfaces of a piston 16 and a side plate 24 at the flow velocity corresponding to the difference in rotation speed, and internal pressure in proportion to the differential rotation between the blades 27 and the housing 13 is generated in the pressure chamber 28 by viscosity friction action of the fluid 29 so as to pressurize the piston 16. Accordingly, a plurality of outer plates 21 and inner plates 22 are frictionally engaged with each other by the pressurizing force corresponding to the pressure working on the piston 16 and rotation torque is transmitted to between the axes through a clutch means 17.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a driving force transmission device that is disposed between two relatively rotatable shafts and transmits driving force between the two shafts.

<Prior Art> Generally, in a four-wheel drive drive force transmission device that transmits torque between the front and rear wheels, or a drive force transmission device for differential restriction that transmits torque between the 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 highly viscous fluid is provided on the side of the piston, a blade is housed in this space, and the differential rotation causes the blade to move inside the space. 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 frictionally engaged is known as described in Japanese Patent Application Laid-Open No. 63-240429.

<Problems to be Solved by the Invention> In this type of driving force transmission device, the transmission torque can be changed according to the differential rotation, so if the radial length of the blade is increased, the torque transmission capacity can be increased. Although the ability to escape from the stack is improved, there is a problem in that the device becomes larger and installation performance becomes worse.

<Means for Solving the Problems> The present invention has been made in view of the above-mentioned conventional problems, and includes a clutch means disposed between two relatively rotatable shafts and transmitting torque between the two shafts. In this driving force transmission device equipped with a piston that controls the transmission torque of the clutch means, one of the two shafts is connected to a housing that accommodates the piston, and the other shaft is rotatably supported by the housing. A space portion in which a high viscosity fluid is sealed in the housing is provided on the side of the piston, and the high viscosity fluid is moved into this space portion by relative rotation with the housing, and the viscous friction responds to the relative rotation. A speed increasing mechanism is disposed between the blade and the rotating shaft to increase the speed of the differential rotation during the differential rotation of the two shafts and transmit it to the blade. .

With the above-described configuration, when differential rotation occurs between the housing and the rotating shaft, the blade rotates relative to the housing, and this forces the high viscosity fluid within the space, reducing its viscous friction effect. As a result, pressure corresponding to the differential rotation is generated within the space.

This pressure presses the piston, engages the clutch means, and transmits torque between the two shafts.

In this case, since the speed of the blade is increased by the speed increasing mechanism, the blade is rotated relative to the housing at a speed greater than the relative rotational speed between the housing and the rotating shaft, thereby generating high pressure in the space, The thrust force acting on the piston is increased and the torque transmission capacity is increased.

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

FIG. 1 shows a driving force transmitting device 10 disposed between two relatively rotatable axles (front and rear wheel axles or left and right wheel axles) 11 and 12, and this driving force transmitting device 10 includes a housing 13,
A rotating shaft 14 that extends vertically through the housing 13 and is rotatably supported; a pressure generating section 15 that generates pressure according to the differential rotation between the housing 13 and the rotating shaft 14; It mainly consists of a piston 16 to which the pressure generated is applied, and a clutch means 17 that is frictionally engaged by the pressing force of the actuating piston 16.

One end of the housing 13 is integrally connected to one of the two shafts 11, and the other shaft 12 of the two shafts is splined into the rotating shaft 14. A cylindrical hollow hole with a bottom is formed in the housing 13 from the other end,
The piston 16 is slidably housed in the hollow hole 18, and the piston 16 is prevented from rotating by engaging with a spline formed on the inner circumference of the housing 13.

The bottom wall of the hollow hole 18 of the housing 13 and the piston 16
A taratch chamber 19 is formed between the end wall of the
This taratch chamber 19 is filled with lubricating oil.

A plurality of outer plates 21 and inner plates 22 constituting the clutch means 17 consisting of a multi-disc clutch are arranged alternately in the clutch member 19, and the outer plates 21 are arranged with splines on the inner periphery of the The inner plate 22 is spline engaged with a clutch hub 23 provided on the outer periphery of the rotating shaft 14.

A side plate 24 is attached to the open end of the hollow hole 18 of the housing 13 to prevent rotation, and a cylindrical space 25 is formed between the side plate 24 and the piston 16.
is formed, and a rotating member 26 having a wall thickness slightly smaller than its axial dimension is housed in this space 25 in a slidable manner. The rotating/rotating member 26 is a speed increasing mechanism 3 having a structure described later.
0 and has two diametrically extending blades 27. As a result, the space 25 is divided into a plurality of pressure chambers on the circumference by a plurality of blades 27,
High viscosity fluid 2 such as silicone oil is placed in each of these pressure chambers 28.
9 is filled. However, the above-mentioned cylindrical space 2
The pressure generating section 15 is constituted by the blade 27 and the high viscosity fluid 29 housed in the pressure generating section 15.
When the two shafts 11 and 12 rotate relative to each other and the blade 27 rotates relatively within the housing 13, the pressure chamber 2
8, a pressure proportional to the relative speed difference of the blades 27 is generated.

The speed increasing mechanism 30 is composed of a planetary gear mechanism, and is disposed between the housing 13 and the rotating shaft 14, and rotates the blade 27 at an increased speed when the two rotate relative to each other.

That is, a rotary sleeve 31 is rotatably supported on the outer periphery of the rotary shaft 14 concentrically with the rotary shaft 14, and the blade 27 is splined onto the rotary sleeve 31. A sun gear 32 is attached to one end of the rotating sleeve 31, and a plurality of circumferential planetary gears 33 meshing with the sun gear 32 are supported on a support shaft 34 held by the side plate 24. On the other hand, a ring gear 35 is spline-engaged on the rotating shaft 14, and the planetary gear 33 is meshed with internal teeth 36 of the ring gear 35.

As a result, when there is no relative rotation between the housing 13 and the rotating shaft 14, the blade 27 is rotated integrally with the housing 13 and the rotating shaft 14;
When relative rotation occurs between the blade 2 and the rotating shaft 14, the blade 2
7 is 32/3 of the relative rotation with respect to the housing I3.
The relative rotation is performed by a factor of 1 (where Sl indicates the number of teeth of the sun gear 32 and S2 indicates the number of teeth of the ring gear 35), and the relative rotation speed is increased.

Next, the operation of the driving force transmission device with the above configuration will be explained.

When relative rotation occurs between the two axes 11 and 12, the flade 2
7 rotates relative to the housing 13. Therefore, the high viscosity fluid 29 filled in the pressure chamber 28 is forcibly moved between the two opposing surfaces of the piston 16 and the side plate 24 at a flow rate corresponding to the difference in rotational speed, and the viscous friction of the high viscosity fluid 29 causes the pressure to increase. The blade 27 and the housing 1 are placed in the chamber 28.
An internal pressure proportional to the differential rotation between the piston 16 and the piston 16 is generated.
is pressed.

Therefore, a plurality of outer plates 21 and inner plates 22
are frictionally engaged with each other by a pressing force corresponding to the pressure acting on the piston 16, and rotational torque is transmitted between the two shafts via the clutch means 17.

In this case, the rotational speed difference of the blade 27 with respect to the housing 13 is the same as that of the two shafts 11. ．． This is 12 differential rotations, that is, 32/31 times the relative rotation between the housing 13 and the rotating shaft 14. Therefore, the pressure generated by the differential rotation of the two shafts 11 and 12 is increased, and the required transmission capacity can be obtained without increasing the diameter.

In the above embodiment, the speed increasing mechanism 30 is
This arrangement allows the speed increasing mechanism 30 to be placed in a small space and is effective in not causing rotational imbalance. The present invention is not limited to this, and various arrangements and configurations may be adopted.

<Effects of the Invention> As described above, the present invention connects the housing that houses the piston to one of the two shafts, connects the rotating shaft rotatably supported by the housing to the other, and has a high-height shaft in the housing. A space filled with viscous fluid is provided on the side of the piston, and the high viscosity fluid is moved into this space by the differential rotation of the two axes, and the viscous friction generates pressure according to the differential rotation of the two axes. This structure houses a blade that rotates and is equipped with a speed-up mechanism that speeds up the rotation of this blade, so it is possible to increase the thrust that acts on the piston with respect to the relative rotation between the housing and the rotating shaft, thereby increasing the torque. This has the effect of increasing the transmission capacity without increasing the size of the device.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a cross-sectional view of the driving force transmission device, and FIGS. 2 and 3 are sections from ■ to ■ in FIG.
They are sectional views taken along lines and ■-■. 13... Housing, 14... Rotating shaft, 15...
Pressure generating part, 16... Piston, 17... Clutch means, 20... Space part, 27... Blade, 30...
・Speed-up mechanism.

Claims (1)

[Claims] (1) In a driving force transmission device comprising a clutch means disposed between two differentially rotatable shafts and transmitting torque between the two shafts, and a piston controlling the transmission torque of the clutch means, the two shafts A housing for accommodating the piston is connected to one side of the housing, a rotating shaft rotatably supported by the housing is connected to the other side, and a space in which a highly viscous fluid is sealed is provided in the housing on the side of the piston. A blade that moves a high viscosity fluid by relative rotation with the housing and generates pressure according to the relative rotation by the viscous friction is housed in this space, and the two shafts are connected between the blade and the rotating shaft. A driving force transmission device comprising a speed increasing mechanism for increasing the speed of the differential rotation during the differential rotation of the blade and transmitting the same to the blade.