JP2583774Y2 - Fluid coupling - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid coupling used for a hydraulic differential limiting device.

[0002]

2. Description of the Related Art As a conventional fluid coupling, for example, there is one shown in FIG. In FIG. 5, the electromagnetic coil 13
Is turned off and the spool 12 is not moved, the orifice 16 is provided between the oil passage 15 of the rotor 14 and the spool 12.
As shown in FIG. 3A, a normal torque characteristic is obtained, the electromagnetic coil 13 is turned on, and the spool 12 is moved rightward in the drawing by the rod 19 via the sleeve 17 and the pin 18. The oil passage 15 and the hydraulic chamber 20 communicate with each other,
The torque characteristic at this time is, as shown in FIG.
It becomes necessary free at the time of operation.

[0003]

However, in such a conventional fluid coupling, since the rod 19 is pushed at the time of the ABS operation, it is necessary to be energized, and there is a problem that a large power loss occurs. there were. On the other hand, there is no need to push the rod 19 during normal running, and there is little power loss. However, since there is a large variation in the axial position of the rod 19, the variation in the orifice opening during normal running is large, and the torque characteristics are not constant. was there.

[0004] The present invention has been made in view of such conventional problems, and provides a fluid coupling having a small torque loss and a small variation in orifice opening degree and a constant torque characteristic. It is an object.

[0005]

In order to achieve the above object, the present invention has a cam housing and a rotor, a spool is slidably housed in the rotor, and the spool is moved by a sleeve via a rod. In the fluid coupling to be provided, a stopper portion which comes into contact with the rotor and stops when pressed against the spool by the accumulating pressure is provided on a side on which the accumulating pressure acts, and a communication hole and a spool hole which can communicate with an oil passage of the rotor. Is formed.

[0006]

When the power is turned off and the rod is not pressed, the spool is pressed by the accumulating pressure, so that the spool is in contact with and fixed to the rotor by the stopper portion. That is, when power is turned off, a predetermined orifice is formed between the spool and the rotor by the accumulation pressure,
Positioned and fixed.

[0007] Therefore, the power loss is reduced and the variation in the orifice opening is also reduced, so that the torque characteristics can be kept constant. On the other hand, at the time of the ABS operation, the rod is pressed, the spool moves, the oil passage of the rotor communicates with the communication hole, and the orifice drain is formed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are views showing an embodiment of the present invention. First, the configuration will be described. In FIG. 1, reference numeral 31 denotes a rotor, and a plunger (not shown) is driven by a rotation speed difference between the rotor 31 and a cam housing (not shown).
A flow resistance is generated to control the transmission torque.

An oil passage 32 is formed in the rotor 31, and the oil passage 32 communicates with a plunger chamber (not shown) for slidably storing the plunger. A spool 33 is slidably housed in the rotor 31 and pressed by the accumulation pressure as shown by an arrow C. A stopper portion 34 is integrally formed on the side of the spool 33 on which the accumulation pressure C acts.

When the accumulation pressure C acts on the spool 33, the spool 33 moves to the left in the drawing,
4 abuts against the rotor 31 and is fixed. At this time,
A predetermined orifice 35 is formed between the oil passage 32 of the rotor 31 and the spool 33. On the outer periphery of the spool 33,
A communication hole 36 communicating with the oil passage 32 is opened, and the spool 33 is opened.
Communicates with the communication hole 36 and the hydraulic chamber 37.
Is formed with a spool hole 38 communicating with the spool hole 38.

An O is provided between the spool 33 and the rotor 31.
A ring 39 is interposed, and a stopper ring 40 that regulates the amount of movement of the spool 33 is provided. Reference numeral 41 denotes a rod for moving the spool 33. When the electromagnetic coil (not shown) is turned on, the rod 41 sucks the plate member and moves the spool 33 via the sleeve and the pin.

Next, the operation will be described. First, the operation during normal traveling will be described. When the electromagnetic coil is turned off, the plate member is not attracted to the electromagnetic coil and does not move. Therefore, the sleeve, the pin and the rod 41
Does not move.

In this state, as shown in FIG. 1, the spool 33 is pressed leftward by the accumulation pressure C,
The rotor 31 is abutted and fixed by the stopper portion 34. At this time, the oil passage 32 of the rotor 31 and the spool 3
3, a predetermined orifice 35 is formed, and its torque characteristic is as shown in FIG.

Thus, during normal running, the spool 3
3 is pressed by the accumulation pressure C and is fixed to the rotor 31 by the stopper portion 34, so that the power loss is small and the variation in the orifice opening is small, so that the torque characteristic is kept constant. Can be.
Next, the operation at the time of ABS operation will be described.

During the ABS operation, the electromagnetic coil is turned on, the plate member is sucked, and the rod 41 presses the spool 33 via the sleeve and the pin. This state is shown in FIG. 2, and the spool 33 moves rightward in the figure until the stopper ring 40 contacts the rotor 31. Therefore, the oil passage 32 of the rotor 31 communicates with the communication hole 36 to form an orifice drain, and the operating torque becomes substantially zero. The torque characteristics at this time are shown in FIG.

FIG. 4 is a diagram showing another embodiment of the present invention. In FIG. 4, 41 is a rod, 42 is a spool, and a communication groove 43 is formed in the rod 41. The communication groove 43 can communicate with the oil passage 32 of the rotor 31,
Also, it communicates with the spool hole 44 of the spool 42. Note that a cutout may be formed instead of the communication groove 43.

When the electromagnetic coil is turned off and the rod 41 is not pressed, the spool 42 is pressed by the accumulation pressure C, and abuts against and is fixed to the rotor 31 by the stopper portion 45. At this time, the orifice 46 is formed. Therefore, also in this embodiment, the same effects as in the above embodiment can be obtained.

[0018]

As described above, according to the present invention, the stopper is formed on the side of the spool on which the accumulating pressure acts, and the spool is fixed and positioned when the power is turned off. The operating torque can be kept constant since the variation is small and the variation in the orifice opening degree is small.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention.

FIG. 2 is an explanatory view at the time of ABS operation.

FIG. 3 is a graph showing torque characteristics.

FIG. 4 shows another embodiment of the present invention.

FIG. 5 shows a conventional example.

[Explanation of symbols]

 31: Rotor 32: Oil path 33, 42: Spool 34, 45: Stopper 35, 46: Orifice 36: Communication hole 37: Hydraulic chamber 38, 44: Spool hole 39: O-ring 40: Stopper ring 41: Rod 43: Communication groove

Claims (2)

(57) [Scope of request for utility model registration] 1. A fluid coupling having a cam housing and a rotor, wherein a spool is slidably housed in the rotor, and the spool is moved by a sleeve via a rod. A fluid coupling, wherein a stopper portion that stops in contact with the rotor is provided on a side on which the accumulating pressure acts, and a communication hole and a spool hole that can communicate with an oil passage of the rotor are formed. And a cam housing and a rotor.
The spool is slidably housed in the
A fluid coupling for moving a spool through the spool when the spool is pressed by an accumulative pressure.
Accumulation pressure acts on the stopper that stops when it comes into contact with the
The rotor oil passage and the spur.
A communication groove that can communicate with the spool hole formed in the
A fluid coupling formed in a pad.