JP2521915Y2 - Viscous fluid coupling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention] (Industrial application field) The present invention relates to a viscous fluid coupling device that can be used for controlling the rotation speed of a cooling fan of an internal combustion engine.

(Prior art) In a conventional viscous fluid coupling device (for example, Japanese Utility Model Application Laid-Open No. 61-108531), since the rotation speed of the output member is not proportional to the amount of viscous fluid in the working chamber, the slope of the hollow hole is changed. Had to respond.

FIG. 4 is an explanatory view of a state in which a hollow 20 formed in a partition plate and a valve 20 in a conventional viscous fluid coupling device are overlapped with a valve 20. The valve 20 is formed in a vertically long rectangular shape and has a rod
By rotating around the fulcrum 15, the closed area of the hollow hole 11 is increased or decreased.

The hollow hole 11 has a boot shape as shown in FIG.
A front end 21 corresponding to a toe, a lower rear end 22 corresponding to a heel, a bottom horizontal surface 23 connecting the front end 21 and the rear end 22, and an upper end 24 corresponding to an outlet. A curved inclined surface 18 corresponding to a boot-shaped upper portion connecting the front end of the upper end portion 24 and the upper end of the distal end portion 21 is formed.

(Problem to be Solved by the Invention) However, in the conventional device shown in FIG. 4, the shape of the valve 20 is a vertically long rectangular shape with respect to the boot-shaped hollow hole 11. Therefore, the curved inclined surface 18 of the hollow hole 11 and the front edge of the valve 20
The angle β formed with 16 ′ was a small acute angle. When the angle β is small, the amount of the viscous fluid flowing from the storage chamber to the working chamber due to the change in the number of rotations of the viscous fluid coupling device and the viscosity of the viscous fluid is large. Therefore, as shown in FIG. 6, at every input rotation of the viscous fluid coupling,
It was extremely difficult to linearly change the fan speed in proportion to the temperature.

It is an object of the present invention to provide a viscous fluid coupling device capable of improving linear characteristics by increasing the crossing angle between a hollow hole and a valve.

[Structure of device]

(Means for Solving the Problems) For this reason, the present invention provides an input member driven by an engine and having a rotating rotor attached thereto, an output member to which rotation is transmitted from the rotating rotor of the input member via a labyrinth mechanism, A storage chamber for the viscous fluid formed by a partition plate in the output member and a working chamber for accommodating the rotary rotor; a hollow formed in the partition plate for feeding the viscous fluid from the storage chamber to the labyrinth mechanism; A temperature-sensitive member having one end fixed to a rotatably supported rod, fixed to the rod, and rotating in one direction by rotating the rod in one direction to form a hollow hole in the partition plate; In a viscous fluid coupling device comprising a valve plate that opens and turns in the other direction by turning in the other direction to close the hole, the hole in the partition plate is located outside the radial direction of the partition plate. That side The circumferential length of the opening edge is shorter than the circumferential length of the opening edge on the radially inward side, and the radially outward and inward opening edges of the valve plate in the other rotational direction in the other direction. The valve plate is inclined so that the radially inner opening edge opens earlier than the radially outer opening edge by one-way rotation of the valve plate, The valve plate has a boot shape having a curved inclined surface that is curved so as to protrude in one direction of rotation, and can intersect the curved inclined surface of the hollow hole, and is opposite to the curved inclined surface in a circumferential direction. An inclined piece having a linear front edge which is inclined at an angle is formed integrally with the end of the valve plate, and this is used as means for solving the problem.

(Operation) In the present invention, the angle α in FIG. 2 can be increased, so that the opening of the hollow hole is gradually expanded from the radially inner side to the outer side by the valve plate by rotating the rod in one direction. At the same time, the opening gradually widens in the circumferential direction in the rotation direction of the valve plate, so that a sufficient opening area can be secured even at the initial stage of opening. Therefore, even when the viscosity of the viscous fluid is low (at high temperature), it is easy to pass through the hollow hole of the viscous fluid as in the case of high viscosity (at low temperature) (the amount of viscous fluid passing through the Regardless of the stability), the amount of viscous fluid required for operation can be reliably supplied from the storage chamber to the working chamber.

(Embodiment) The present invention will be described below with reference to the embodiment of the drawings.
FIG. 3 to FIG. 3 show an embodiment of the present invention. First, in FIG. 1, reference numeral 2 denotes an input member to which a disk-shaped rotary rotor 1 is fitted and fixed. Reference numeral 3 denotes an output member formed of a casing, which is rotatably supported by the input member 2 via a bearing 3a in a state in which the rotor 1 is accommodated. Labyrinth grooves 9 are formed in the torque transmitting surface, and the opposing grooves 9 are loosely fitted. On the left end surface of the output member 3, an output member 4 forming a cover having a stepped recess is sealed with an O-ring 14 and integrally joined so that an appropriate space is formed between the output member 3 and the rotor 1. Have been. The output member 4 constitutes the front part of the joint body.

Reference numeral 5 denotes a partition plate, which is fixed to the shoulder with an inner peripheral step of the output member 4. The partition plate 5 divides the space between the rotor 1 and the output member 4 into a working chamber 7 in which the rotor 1 is housed and an output member. It is divided into a storage room 6 on the four side. A hollow hole 11 is formed in the partition plate 5 so that the viscous fluid in the storage chamber 6 can flow to the working chamber 7 through the hollow hole 11. In addition, a rod 15 is rotatably mounted substantially at the center of the output member 4.
The valve plate 13 is fixed to the rod 15. Reference numeral 12 denotes a bimetal, which operates by detecting the air temperature behind the radiator. One end of the bimetal 12 is fixed to a rod 15, and a valve plate 13 is provided with a hollow hole in the partition plate 5 in accordance with the operation. 11 is controlled to open and close. In the drawing, reference numeral 8 denotes a pump mechanism for feeding a viscous fluid from the working chamber 7 to the storage chamber 6, and reference numeral 10 denotes a passage formed in the rotary rotor 1.

FIG. 2 shows a front view of the valve plate 13 and the hole 11 in FIG. 1, and the hole 11 has the same shape as that of FIG. That is, the hollow hole 11 has a boot shape, and a front end portion 21 corresponding to a toe portion and a lower rear end portion 22 corresponding to a heel portion.
A bottom horizontal surface 23 connecting the front end portion 21 and the rear end portion 22; an upper end portion 24 corresponding to an opening; and a boot-shaped upper portion connecting the front end of the upper end portion 24 and the upper end of the front end portion 21. Is formed. As described above, the hollow portion 11 has an upper end portion 24, that is, an opening width on the outer peripheral side, which is smaller than a horizontal surface 23 on the bottom portion, that is, an opening width on the inner peripheral side. The valve plate 13 is fixed to the rod 15 and rotates in accordance with the rotation of the rod 15, and the valve body 13a extends in the radial direction of the rod 15.
And a curved inclined surface equivalent to the boot-shaped upper part of the hollow 11
An inclined piece 13b formed integrally with the valve body 13a so as to intersect with the valve body 18 and to be inclined with respect to the valve body 13a.
And the front edge 16 of the inclined piece 13b continuous with the front edge of the valve body 13a has a linear shape inclined toward the hollow hole 11. Therefore, in the present invention, the angle α between the leading edge 16 and the curved inclined surface 18 is set to be larger than the angle β in FIG. The direction in which the valve plate 13 rotates so as to open the hollow hole 11 is defined as the forward rotation direction of the valve plate 13, and the valve plate 13 is rotated in the forward direction.
The direction in which 13 rotates to close the hollow 11
13 reverse rotation direction.

Next, when the air temperature behind the radiator is lower than the set value, the bimetal 12 detects and operates the air temperature, and the valve plate 13 closes the hollow hole 11 in the partition plate 5 to store the air. The viscous fluid is prevented from flowing from the chamber 6 to the working chamber 7. Accordingly, the viscous fluid in the working chamber 7 almost disappears with the rotation of the rotor 1 and the output members 3 and 4, and the torque is transmitted from the rotor 1 to the output members 3 and 4 greatly reduced due to the OFF state. .

Next, when the air temperature exceeds the set value, the valve plate 13 opens the hollow hole 11 in the partition plate 5 and allows the flow of the viscous fluid from the storage chamber 6 to the working chamber 7. The amount of the fluid increases, and the torque is transmitted from the rotor 1 to the output members 3 and 4 by being turned ON, so that the torque increases.

As shown in FIG. 2, the front edge 16 of the V-shaped valve plate 13 for opening and closing the boot-shaped hollow hole 11 provided in the partition plate 5 of the present invention,
When the temperature drops, the valve plate 13 rotates clockwise about the rod 15 in FIG.
And the leading edge 16 form an angle α. Thus, the change in the oil level in the storage chamber 6 due to the change in the rotation speed of the viscous fluid coupling and the viscosity of the sealed oil can be reduced, and the change in the oil level in the working chamber 7 accordingly decreases.

Therefore, the change in the fan speed due to factors other than the temperature can be reduced, and in all the input rotations from low speed (viscous fluid coupling input speed) to high speed,
The fan speed can be changed linearly with respect to the temperature as shown in FIG.

FIG. 3 shows another embodiment of the valve plate 13, in which the portion fixed to the rod 15 is vertically inclined while it is inclined obliquely to the upper left in FIG. However, there is no difference in the effect.

2 and 4, the area a through which oil passes through the oil passage formed by the valve plate 13 and the hollow hole 11 is determined by the rotation speed of the viscous fluid coupling, the input rotation speed and the output rotation speed of the viscous fluid coupling. It depends on the difference and oil viscosity. Accordingly, the oil level in the storage chamber 6 also changes, and the oil level in the working chamber 7 also changes, so that the fan speed changes.
In FIGS. 2 and 4, X is the oil level during high-speed rotation (or when the oil has a low viscosity), Y is the oil level during low-speed rotation (or when the oil has a high viscosity), and A is the two oil levels X, in FIG. Y difference, B is both oil levels in Fig. 4.
The difference between X and Y is shown, but A is much smaller than B. In addition, by setting the angle α in FIG. 2 larger than the angle β in FIG. 4 as described above, the change in the oil level in the storage chamber 6 can be suppressed small, and the change in the fan speed can be suppressed.

[Effect of the invention]

As described in detail above, according to the present invention, since the angle α can be increased, the opening of the hollow hole is gradually expanded from the radially inner side to the outer side by the valve plate by rotating the rod in one direction, and In addition, a large opening area can be ensured even at the initial stage of opening, because the valve plate gradually widens in the circumferential direction in the rotation direction of the valve plate. Therefore, even when the viscosity of the viscous fluid is low (at high temperature), it is easy to pass through the hollow hole of the viscous fluid as in the case of high viscosity (at low temperature) (the amount of viscous fluid passing through the Regardless of the stability), the amount of viscous fluid required for operation can be reliably supplied from the storage chamber to the working chamber.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a viscous fluid coupling device showing an embodiment of the present invention, FIG. 2 is a front view showing an overlapping state of a valve plate and a hollow hole of one embodiment of the present invention, and FIG. FIG. 2 is a front view showing an embodiment of the valve plate according to the present invention, which is different from FIG.
FIG. 4 is a front view showing the overlapping state of the conventional valve plate and the hollow hole, FIG. 5 is a diagram showing the relationship between the bimetal front air temperature and the rotation speed of the output unit in the present invention, and FIG. It is a diagram which shows the relationship between the conventional bimetal front air temperature and the rotation speed of an output part. Description of main parts in the drawing 1 ... Rotating rotor 2 ... Input member 3,4 ... Output member 6 ... Storage room 7 ... Working room 8 ... Pump mechanism 9 ... Labyrinth mechanism 10 ... Path 11 ... Bore 12 12 Bimetal 13 Valve plate 15 Rod

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-37324 (JP, A) JP-A-63-214528 (JP, A) JP-A-63-180729 (JP, A) JP-A-60-180 184724 (JP, A) JP-A-58-37324 (JP, A) JP-A-58-146132 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] An input member driven by an engine and having a rotating rotor attached thereto, an output member to which rotation is transmitted from the rotating rotor of the input member via a labyrinth mechanism, and a partition plate formed in the output member. One end of a viscous fluid storage chamber and a working chamber accommodating the rotary rotor, a hollow hole formed in the partition plate for feeding the viscous fluid from the storage chamber to the labyrinth mechanism, and one end of a rod rotatably supported by the output member Is fixed to the rod, which is fixed to the rod, rotates in one direction by turning the rod in one direction, opens a hollow hole in the partition plate, and turns in the other direction by turning in the other direction. In a viscous fluid coupling device comprising a valve plate which pivots in a direction to close the hollow hole, the hollow hole of the partition plate is formed in a circumferential length of an opening edge of a radially outward side of the partition plate. Is the radially inward side An opening edge on one side in the circumferential direction, which is shorter than a circumferential length of the opening edge and connects each end of the radially outer side and inner side opening edges on the other side in the rotation direction of the valve plate. The one-way rotation of the valve plate inclines so that the radially inner opening edge is opened earlier than the radially outer opening edge, and is protruded in the one-way rotation direction side of the valve plate. A sloped piece having a boot-like shape having a curved inclined surface curved to a side, and having a linear front edge which can cross the curved inclined surface of the hollow hole and is inclined in a direction opposite to the curved inclined surface in a circumferential direction, A viscous fluid coupling device formed integrally with an end of a valve plate.