JPS60201126A - Piston differential-pressure controlling clutch - Google Patents

Abstract

PURPOSE:To reduce a loss of energy, by providing a guide groove on a cylindrical surface in one of the rotary shafts to fit a roller and transmitting continuous rotation to the other rotary shaft through the differential pressure of a piston, in the case of a piston differential-pressure controlling clutch. CONSTITUTION:A rotary cylindrical surface 4a provides a guide groove 7, which enables a roller 5 to be fitted and displaced in the axial direction, and a piston 8, being able to perform a reciprocating motion in the axial direction outside the cylindrical surface 4a, holds an axis 6 of the roller 5. If an input shaft 1 is rotated, a change of volume, being caused in spaces 14, 15 by reciprocating the piston 8 n-times in a cylinder 10, generates a differential pressure, and if the differential pressure is balanced with propulsive force from the guide groove, rotation of the shaft 1 is transmitted to an output shaft. Consequently, a loss of energy can be reduced by enabling a clutch to play a role as an elastic joint in accordance with springiness of the differential pressure applied to the piston 8 and a curved shape of the guide groove.

Description

[Detailed description of the invention] This invention relates to a clutch.

In rotary power transmission devices, dry or wet mechanical clutches utilize the frictional force of contact surfaces as a device that can intermittent the transmission of torque and phase, and convert it into dynamic or static pressure of fluid to drive pumps and turbines, etc. There are various combinations of fluid couplings, torque converters, and others. However, in these conventional clutches and joints, when there is a difference in rotational speed, energy loss occurs as heat from friction surfaces and fluid when transmitting power, and it is generally difficult to control the transmission torque in a variable manner.

In such a power transmission disconnection device, the present invention not only reduces energy loss due to friction and slippage, but also utilizes the difference in transmitted energy due to a difference in rotational speed as fluid energy, and also variable control of transmitted torque. The purpose is to provide a high-performance power transmission disconnection device by combining possible new mechanisms.

In response to this month, the piston differential pressure III of this invention
The clutch has a cylindrical surface directly connected to one rotating shaft.
One or more guide grooves are provided for smooth displacement in the axial direction with n cycles of rotation, and a plurality of sets of rollers or rolling balls are fitted into the guide grooves, and a piston that holds them is connected to the guide grooves for rotation and reciprocating motion. The piston is arranged in a coaxially rotatable cylinder that can be freely displaced in the axial direction and has an airtight property, and the differential pressure applied to the piston is controlled. It is characterized by intermittent rotation of the other rotating shaft directly connected to the cylinder and the one rotating shaft.

The details of the present invention will be explained below with reference to an embodiment shown in FIG.

In FIG. 1, 100 is a piston differential pressure controlled clutch, and the piston differential pressure controlled clutch 100 is connected to an input IF.
It is provided between Ill11 and the output shaft 2.

The piston differential pressure controlled clutch 100 includes a cylinder 4, a piston 8, and a cylinder 10. An input shaft 1 and an output shaft 2 disposed coaxially are coupled to each other via a thrust bearing 3 so that they can rotate freely and have no relative displacement in the axial direction. The cylinder 4 is coaxially and directly connected to the input shaft 1, and n rollers 5 are fitted to the rotating cylindrical surface 4a of the cylinder 4, and are guides that make n-period, for example, sinusoidal axial displacement according to the circumferential angle. A groove 7 is provided, and the roller 5 has its shaft 6 held on the outside of the cylindrical surface 4a by a piston 8 that can reciprocate in the axial direction. The piston 8 has a head portion 8a and a skirt portion 8b, and is slidably engaged with the cylindrical surface 4a at the skirt portion 8b.

The piston 8 has a structure that allows it to slide smoothly only in the axial direction while maintaining airtightness on the 1° cylindrical inner surface of the cylinder directly connected to the output shaft 2 with a piston ring 9.9'. It has an axial guide groove 11 and a plurality of rollers 13 with a shaft 12 held in a cylinder 1o, and each roller is fitted into each guide groove to freely slide in the axial direction.

Two spaces 14 formed by the piston 8 within the cylinder 10
．． 15 are flow paths 17 provided on the input shaft 1 and the output shaft 2, respectively.
．． 16, and is connected to Gaikaiso Road 18.19 via C)Lt%V>B21.2°. The shaft seal 22 seals between the input shaft 1 and the output shaft 2.

In the piston differential pressure controlled clutch 100 with such a configuration, when the input shaft 1 rotates and the output shaft 2 is completely braked, the piston 8 reciprocates within the cylinder 10 0 times per rotation. This causes a change in the volume of space 14.15.

When the external pressure in the space 14.15 is increased and the differential pressure applied to the piston 8 is approximately balanced with the axial torque and the axial thrust generated from the guide groove caused by the axial angle and radial distance of the guide groove 7, the axial movement of the piston 8 is It stops, and the rotation of axis 1 comes out)j
fully transmitted to the shaft. The pressure in the external flow paths 18 and 19 is controlled by opening and closing the flow path that communicates the two flow paths with the valve 24, the control device 25, etc., adjusting the bulk elasticity of each flow path, adjusting with an external pressure source, etc. Accordingly, power transmission from the input shaft 1 to the output shaft 2 can be interrupted, connected, or partially connected.

In this way, the piston differential pressure controlled clutch of the present invention can function as an elastic joint even in a fully connected state of power due to the elasticity of the differential pressure applied to the piston and the curved shape of the guide groove 7. No slipping occurs. In addition, in the semi-connected state and the disconnected state, external work can be performed using the differential pressure generated in the fluid. Furthermore, it is also possible to change the transmission torque by controlling the repulsive force difference, and it is also possible to variably control the limit of the transmission torque.

In power transmission using this piston differential pressure controlled clutch, complete power transmission, partial power transmission (half-clutch), and transmission cut-off as necessary can be achieved efficiently and easily with no worn parts due to the compact device structure.

[Brief explanation of the drawing]

FIG. 1 is an explanatory view, partially cut away, of an example of a device showing an embodiment of the present invention. 1... Input shaft 2... Output shaft 3... Thrust bearing 4a... Rotating cylindrical surface 5... Roller 6.
...Roller shaft 7...Guide groove 24...Valve 25...
·Control device

Claims (1)

[Claims] One or more stages of guide grooves are formed on the cylindrical surface directly connected to one rotational shaft to allow smooth displacement in the axial direction at n cycles per rotation.
A plurality of sets of rollers or rolling balls are fitted into this guide groove, and a piston that holds the rollers is configured to mutually convert rotation and reciprocating motion, and the piston is freely displaceable in the axial direction. The piston is placed in a coaxially rotatable cylinder that is airtight and can be maintained at the piston, and controls the differential pressure applied to the piston to control the rotation between the other rotating shaft directly connected to the cylinder and the one rotating shaft. A piston differential pressure controlled clutch that is characterized by intermittent engagement.