JPH01135928A - Hydraulic slip control coupling - Google Patents

Abstract

PURPOSE:To enable slip conditions to be freely controlled as necessity arises by providing a discharge valve and a suction valve on two oil ports which connect the chamber partitioned by a rotor, a cam ring, and blades with the central hole of the rotor, and by controlling the oil flow caused by the rotation of the rotor by means of an externally operating flow control valve. CONSTITUTION:A discharge valve 12 and a suction valve 13 are provided on the oil ports connecting the small chamber formed by the inner surface of a cam ring 2 having been fixed inside a casing 1, a rotor 3, and blades 4 with the holes 9, 10, 11 in the center of the rotor. Further, the flow of operating oil is controlled by an orifice 11a in the oil passage 11 by operating a flow control valve 7 which has been engaged with a shifter 17 being operated by an external force through a slider 16, a pin 15, and a guide pin 14. Thus, a prescribed slip condition can be obtained at the time of rotating power transmission, enabling the transmission efficiency of power can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a slip coupling used to cope with the tight corner braking phenomenon of a constantly four-wheel drive vehicle.

(b) Prior Art The power transmission principle of conventional slip couplings utilizes the viscous frictional force of high-viscosity oil.

In order to obtain a large transmission force with a small volume, disks with many grooves fixed to the shafts of the leading and driven sides are arranged alternately at small intervals, and the gaps are filled with oil. ,
The viscous resistance generated between the oil and the disk serves to transmit power. Therefore, while power is being transmitted, the transmission is always accompanied by slip.

(c) Problems to be Solved by the Invention In a power transmission system using the viscous resistance of oil, the magnitude of slip increases in proportion to the magnitude of transmitted power. Continuous four-wheel drive vehicles require slip transmission of power only when driving on curves with a small turning radius, which causes tight corner braking; when driving in a straight line, slip transmission deteriorates the power transmission characteristics. .

An ideal slip coupling has the ability to slip only when necessary, which means that it has the ability to control the slip state of the coupling from the outside.

The object of the present invention is to provide a coupling with a function that allows the slip state to be freely controlled as necessary.

(2) Means for Solving Problems This invention will be explained as follows based on the drawings. Fig. 1 shows a cross-sectional view of the coupling. Rotor 3
A plurality of blades 4 are fitted into grooves 3b machined on the outer periphery, and are pressed against the inner surface of the cam ring 2 by springs 5. The gap between the rotor 3 and the cam ring 2 is subdivided by the blades 4 to form small individual chambers, and as the rotor 3 rotates, the volume of the chamber changes without increasing or decreasing.

A cam ring 2 is fixed inside the casing 1, and its narrow end serves as a shaft 1a.

Now, by filling the casing 1 with working oil and providing a hole in the rotor 3 for the oil to pass through, one flow of working oil can be created within the casing 1. Holes 9 and 10 are provided in the center of the rotor 3, and the holes 9 and 10 are connected to each of the slightly divided chambers, and a discharge valve 12 and a suction valve 13 are installed in each of the S''XX oil holes.
Prepare. Then, the holes 9 and 10 are connected, and a flow control valve 7 forming an orifice in the hole 11 is provided.

When the rotor 3 rotates, the working oil in the chamber whose volume contracts enters the hole 9 through the discharge valve 12, and the working oil is supplied from the hole 10 through the suction valve 13 into the chamber where the heart is fed. The flow control valve 7 acts to restrict the flow of hydraulic oil at the orifice 11a, or its control is performed from outside the coupling.

Slider 1 is controlled by force applied from outside the coupling.
When the shifter 17, which is fitted in the pin 6, is pushed to the right, the pin 15 is pushed in, and the guide pin 14 is pushed out to the right. This guide pin 14 has a spring 8 attached to the tip of the flow control valve 7.
The orifice 11a opens when the kite pin 14 moves to the right, and closes when the kite pin 14 moves to the left.

(e) When the orifice 11a is opened by adjusting the operating flow rate control valve 7, the flow resistance of the operating oil passing through it is small, so the increase in the oil pressure in the chamber whose volume is reduced is small, and the rotational force of the rotor 3 is transferred to the cam ring. Although only a small amount of rotational force can be transmitted to 2, if it is narrowed down to a small value, the oil pressure will rise, and even if there is a slip due to the amount of oil passing through the orifice 11a, a considerable amount of rotational force can be transmitted. When the orifice 11a is further throttled and the orifice 11a is completely closed, the working oil cannot flow between the holes 9 and 10, so the rotor 3 and the casing 1 rotate as one without slipping.

Therefore, the transmission state of rotational power between the shaft 1a and the shaft 3a is
To freely control transmission of the slip state, transmission of the lock state, etc., it is possible to perform control simply by moving the shifter 17 left and right from the outside.

Effect: The only time a four-wheel drive vehicle requires slip transmission of power while driving is when driving around a curve with a small turning radius. Therefore, when driving on general roads, the proportion of slip transmission required is extremely small. The coupling of this invention, which can freely control slip and lock, does not transmit unnecessary slip when driving on ordinary roads, so it can significantly improve power transmission efficiency compared to conventional slip couplings. It's now possible.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the coupling taken along the plane A--A in FIG. Figure 2 is a longitudinal sectional view. 1: Casing 1a: Shaft 2: Cam ring 3: Rotor 3a: Shaft 3b; Groove 4; Blade 5; Spring
6: Side plate 7: Flow rate control valve 8; Spring 9: Hole 10:
Hole 11: Hole 11a Niorifice 12: Discharge valve 1
3: Suction valve 14: Guide pin 15: Pin 16; Slider 17: Shifter

Claims (1)

[Claims] 1. In a coupling structure in which a cam ring with a polygonal inner surface is fixed to a casing filled with working oil, and a rotor with blades fitted in a groove on the outer periphery rotates at the center of the cam ring, the connection between the rotor and the cam ring is A discharge valve and a suction valve are installed in the middle of the two oil holes that connect each chamber into which the blades divide the gap into a medium hole in the center of the rotor, and take advantage of the fact that the volume of the chamber changes as the rotor rotates. This creates an oil flow, which is restricted by a flow control valve with a hollow hole to generate hydraulic pressure, allowing rotational power to be transmitted between the rotor and cam ring, and the amount of transmission can be actuated from outside the coupling. A hydraulic slip control coupling that can be controlled by the opening of the flow control valve.