JP2528704Y2 - Fan coupling - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan coupling which is mounted on a bearing portion of an engine radiator cooling fan of an automobile and adjusts a rotation speed of the fan according to a temperature.

2. Description of the Related Art Conventionally, there has been known a fan coupling of this type to which a viscous coupling is applied. That is,
A pump section is provided on the outer periphery of the viscous coupling section so that the viscous fluid circulates through the viscous coupling section,
The valve in this circulation path is opened and closed with a bimetal to control this circulation.At low temperatures, the circulation is stopped to remove the viscous fluid from the coupling part so that the rotational force is not transmitted to the fan. The ring portion is connected to rotate the fan.

In this conventional fan coupling, since the valve is driven from the bimetal via a link mechanism or the like, the structure is complicated, time is required for assembling, the mechanical accuracy is easily reduced, and the bimetal The small output also overlaps, causing valve leakage and inaccurate operation.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances and aims to eliminate these inconveniences and to realize a fan coupling that has a simple structure, is easy to manufacture, and can obtain accurate operation.

Means for Solving the Problems The present invention provides a rotating plate that is attached to the tip of a rotating shaft and rotates with the rotating shaft, a fan is mounted around the rotating plate, and is attached to the rotating shaft and rotates separately from the rotating shaft. A case that covers the outer periphery of the rotating plate, a viscous fluid that is accommodated with extra space in the case, and a rear chamber that is provided in the case and includes the rotating plate inside the case. A partition plate for partitioning into a front chamber located in a front part, formed near the peripheral end of the rotary plate and the case or the partition plate,
A viscous coupling unit coupled by a viscous fluid, a pump unit formed on the outer periphery of the viscous coupling unit, and sending the viscous fluid from the rear chamber to the front chamber by the relative rotation of the rotary plate and the case; A return hole provided at an inner peripheral position of the viscous coupling portion, a valve unit mounting hole provided at a front position of the return hole on the front surface of the case, and a valve unit inserted and mounted in the valve unit mounting hole from the front. Forming a distal end portion of the valve unit, having a substantially cylindrical peripheral surface hole, having an elastic seal at the distal end, closely contacting a partition plate around the return hole, and transferring a viscous fluid from the front chamber to the rear chamber. A tip tube portion that can pass through, provided in this tip tube portion,
A valve that comes into contact with and separates from the elastic seal to regulate opening and closing of the flow passing through the distal end tubular portion, and a valve that is provided at the base of the valve unit and that is actuated by wax that expands by receiving heat from the front of the case; This is a fan coupling comprising a temperature-sensitive operating body to be opened.

Embodiment Hereinafter, an embodiment illustrating the present invention will be described in detail.

In this fan coupling 10, reference numeral 11 denotes a rotating shaft, which is provided at the front end of the engine and rotates together with the engine. Reference numeral 12 denotes a rotating plate which is connected to the rotating shaft 11 and rotates integrally therewith.

Reference numeral 13 denotes a case, which is formed by connecting a rear plate 14 and a front plate 15 and covers the rotating plate 12. A fan 16 is mounted around the rear plate 14, and a rotating shaft 11 is coupled to a central portion via a ball bearing 17, so that the case 13 and the fan 16 can rotate separately from the rotating shaft 11. it can. Reference numeral 18 denotes a viscous fluid, which is made of silicone oil or the like and is accommodated in the case 13 with an extra space. Reference numeral 19 denotes a partition plate, which is provided in the case 13 between the rear plate 14 and the front plate 15 to partition the inside of the case 13 into a rear chamber 20 and a front chamber 21.

Reference numeral 22 denotes a viscous coupling unit, and the rotating plate 12 and the rear plate 14
A large number of concave and convex grooves are formed near the peripheral end of the shaft and mesh with each other.
The torque of 12 can be transmitted to the rear plate 13. In addition,
This viscous coupling part consists of a rotating plate 12 and a partition plate.
19 may be formed.

Reference numeral 23 denotes a pump portion, which forms a circumferential groove 24 in the rear plate 14 on the outer periphery of the viscous coupling portion 22, and a blade plate 25,
Are provided, and small holes 26,
When the rotating plate 12 and the case 13 rotate relative to each other, the viscous fluid 18 flowing into the circumferential groove 24 while rotating by the rotating plate 12 collides with the blade plates 25,. Are sent to the front chamber 21 from the small holes 26,. The pump section may have another configuration as long as the pump section sends the viscous fluid from the rear chamber to the front chamber.

Reference numerals 27, 27 denote reflux holes, which are provided symmetrically with respect to the center at two locations on the inner periphery of the viscous coupling portion 22 of the partition plate 19,
Through this, the viscous fluid 18 can be sent from the front chamber 21 to the rear chamber 20. Through holes 28,... Are formed in the vicinity of the return holes 27, 27 of the rotating plate 12, so that the viscous fluid 18 from the return holes 27, 27 can be satisfactorily sent to the viscous coupling unit 22.

Reference numerals 29, 29 denote valve unit mounting holes, which are formed in the front plate 15 of the case 13 in front of the return holes 27, 27 and have internal threads on the inner periphery.

30 and 30 are valve units, and valve unit mounting holes 29 and 29
Are respectively inserted from the front and screwed.

Reference numeral 31 denotes a distal end cylindrical portion, which is a substantially cylindrical portion forming the distal end of the valve unit 30, has a peripheral surface hole 32,... With this valve seat
The tip including 33 is covered with an elastic seal 34 using rubber or the like. For this reason, when the viscous fluid 18 is mounted on the valve unit mounting hole 29, the tip is in close contact with the partition plate 19 around the return hole 27 by the elastic seal 34, and the peripheral surface holes 32,. It can flow from the front chamber 21 to the rear chamber 20.

Reference numeral 35 denotes a valve, and the valve seat 33, the elastic seal 34, and the valve
Consists of 36. The valve element 36 is fixed by caulking to the tip of a retainer 37, and the retainer 37 is movable in the tip tube 31, and a valve unit is provided by a spring 38 provided in the tip tube 31.
The valve element 36 is urged toward the base 30 side, so that the valve element 36 is pressed against the elastic seal 34 on the surface of the valve seat 33 from the distal end, that is, from the rear chamber 20.

Numeral 39 denotes a temperature-sensitive operating body, which accommodates a thermally expandable wax 41 in a wax chamber 40 projecting toward the base of the valve unit 30, and uses a rubber diaphragm 42, an intermediate fluid 43, a rubber piston 44, This is transmitted to a rod 46 via 45, and the rod 46 projects when the temperature rises. The tip of the rod 46 abuts the retainer 37, so that the rod 46
When the temperature rises and protrudes, the retainer 37, that is, the valve body 36 is pushed against the spring 38, and is separated from the valve seat 33 to release the valve 35.
Is opened, and when the temperature decreases, the retainer 37 is pushed again and retreated, and the valve 35 is closed.

Since the fan coupling 10 has the above configuration, it operates as follows.

When the temperature is low, the rod 35 of the temperature-sensitive operating member 39 does not project, so the valve 35 is closed. Accordingly, when the rotating shaft 11 rotates and the rotating plate 12 rotates together therewith, the viscous fluid 18 in the rear chamber 20 is sent to the front chamber 21 by the pump unit 23, and almost all the viscous fluid accumulates in the front chamber 21. . For this reason,
The viscous coupling portion 22 has almost no viscous fluid 18 and cannot transmit torque, and the case 13 or the fan 16 rotates only slightly compared to the rotation of the rotating shaft 11. .

When the temperature of the radiator becomes high, the heat causes the wax 41 protruding from the front surface of the case 13 to expand, the rod 46 of the temperature-sensitive operating member 39 protruding, and the valve 35 being opened. Therefore, the rotating shaft 11 rotates, and the viscous fluid 18
Is sent to the front chamber 21, the viscous fluid 18 returns to the rear chamber 20 through the return holes 27, 27 by centrifugal force. For this reason, the viscous coupling part 22 is immersed in the viscous fluid 18, and a sufficient rotational force can be transmitted, so that the case 13 and the fan 16 are rotated well with the rotary shaft 11. The viscous coupling part
Since the sliding of the pump 22 is not eliminated, the operation of the pump section 22 is not hindered.

In the above example, two valve units are provided. Alternatively, three or more valve units may be provided, or only one valve unit may be provided. Of course, if only one is provided, an appropriate weight must be provided to maintain the balance.

Effect of the Invention In the fan coupling of the invention, as described above, the valve is provided integrally with the temperature-sensitive operating body in the valve unit,
Since this valve unit is configured to be inserted from the front of the case and attached, the structure becomes simple and the assembling work becomes extremely easy. In addition, the valve unit has a temperature-sensitive operating unit and a valve that are integrated, and the temperature-sensitive operating unit directly operates the valve without going through a link mechanism. Since a wax-type temperature-sensitive operating body having the following characteristics is used, leakage is less likely to occur and accurate operation can be obtained. Further, even in the case where the valve leaks, the maintenance can be improved since the repair can be performed simply by replacing the valve unit.

[Brief description of the drawings]

1 is a side sectional view, FIG. 2 is a front view, and FIG. 3 is a sectional view of a valve unit. 10 ... fan coupling, 11 ... rotating shaft, 12 ... rotating plate, 13
... case, 14 ... rear plate, 15 ... front plate, 16 ... fan, 18 ...
Viscous fluid, 19 ... partition plate, 20 ... rear chamber, 21 ... front chamber, 22 ...
Viscous coupling part, 23… Pump part, 27,27… Reflux hole, 2
9 ... Valve unit mounting hole, 30 ... Valve unit, 31 ... Tip end, 32, ... Peripheral hole, 34 ... Elastic seal, 35 ... Valve, 39 ...
Temperature-sensitive actuator, 41 ... wax.

Claims (1)

(57) [Scope of request for utility model registration] A rotating plate attached to a tip of the rotating shaft and rotating together with the rotating shaft; a fan mounted around the rotating plate; and a fan attached to the rotating shaft and capable of rotating separately from the rotating shaft. A case that covers the outer periphery of the rotating plate, a viscous fluid that is accommodated in the case with an extra space in the case, a rear chamber that is provided in the case and includes the rotating plate inside the case, and a front chamber that is located at the front. A partition plate for partitioning into a compartment, formed near the periphery of the rotary plate and between the case or the partition plate,
A viscous coupling unit coupled by a viscous fluid, a pump unit formed on the outer periphery of the viscous coupling unit, and sending the viscous fluid from the rear chamber to the front chamber by the relative rotation of the rotary plate and the case; A return hole provided at an inner peripheral position of the viscous coupling portion, a valve unit mounting hole provided at a front position of the return hole on the front surface of the case, and a valve unit inserted and mounted in the valve unit mounting hole from the front. Forming a distal end portion of the valve unit, having a substantially cylindrical peripheral surface hole, having an elastic seal at the distal end, closely contacting a partition plate around the return hole, and transferring a viscous fluid from the front chamber to the rear chamber. A tip tube portion that can pass through, provided in this tip tube portion,
A valve that comes into contact with and separates from the elastic seal to open and close the flow passing through the distal end cylindrical portion; Fan coupling consisting of a temperature-sensitive operating part to be opened.