JPS58214025A - Fluid coupling - Google Patents

Abstract

PURPOSE:To substantially decrease the idle rotation speed of the outlet member for decreasing power consumption during the idle operation, by minimizing to the degree as necessary the portion which develops shearing resistance in the fluid. CONSTITUTION:When the environmental temperature around the bimetal 15 is decrease, the fluid inside the working chamber 12 is pumped into the reservoir 13 to be stored therein, with the result that the amount of the fluid inside the shearing space S is decreased and the rotating speed difference between the inlet member 4 and the outlet members 5, 7 is increased, so that the fan blade 21 makes an idle rotation. Then, the protrusions 19, 20 press out the fluid between the inlet member 4 and the outlet members 5, 7 into the communicating hole 14 effectively, so that most of the fluid amount can be stored in the reservoir remaining practically no fluid in the gap between the inlet member 4 and the outlet members 5, 7. The idle rotating speed of the fan blade 21 is thus decreased considerably.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluid coupling for use in a driving device for a cooling fan device of an internal combustion engine, etc., which uses a fluid medium to transmit the entire torque between relatively rotating input and output members. .

Conventionally, an output member consisting of a body member and a cover member forming a working fluid storage chamber and a working chamber, and an output member located within the working chamber, forming a fluid shearing space entirely, and and an input member that is rotatable relative to the output member. Fluid couplings that increase or decrease torque have been proposed.

In this type of fluid coupling, the storage chamber is located on the side surface of the working chamber (2), and the communication hole with the storage chamber is located near the inner and outer peripheries of the working chamber.
There are 2. Here, the communication hole near the inner periphery serves as a fluid supply path from the storage chamber to the working chamber. The communication hole near the outer periphery acts as a fluid discharge passage from the working chamber to the storage chamber (7). For this purpose, a pump portion consisting of a protrusion extending from the output member toward one end surface of the input member is provided, and the fluid supplied from the storage chamber to the working chamber is pumped through the input and output members in the working chamber. Torque transmission medium between ]2
Due to the action 1, constant diameter, and centrifugal force π, the water is circulated to the storage chamber through the pump section VC provided near the outer periphery of the working chamber.

By the way, in the conventional example G6, the axial clearance between the input member and the output member on the opposite side of the pump part, and the radial clearance between the input member outer circumference and the output member are relatively small over almost the entire area. It is formed.

This is considered to be necessary in order to increase the efficiency of the pump section and discharge the working fluid to the storage chamber with full efficiency.71. This is because Then, when the supply passage is completely closed and the supply of fluid to the work chamber is completely stopped L2, the fluid Jlr in the work chamber is reduced and the output member is rotated at a newly opened idle, the fluid remains in the gap 17, and this gap is small. As a result, the idle rotational speed of the output member is not sufficiently reduced as a result of the shear resistance of the fluid generated, and as a result, there is a problem in that the drive of the output member consumes all unnecessary horsepower1. In view of the above problems, it is an object of the present invention to provide a fluid coupling capable of sufficiently reducing the idle rotation speed of an output member and consuming less horsepower during idle rotation. The present invention also provides fluid shear resistance.
．． This is based on experimental results showing that minimizing the portion that is inserted is effective in reducing the idle rotational speed of the output member.

The following is a complete detailed description of the embodiments of this invention based on the drawings.
, FIG. 1 shows a fluid coupling according to the present invention, a drive Mffi of a cooling fan device for an internal combustion engine, and 1. This is a cross-sectional view showing an example of application, with an input shaft having a 1-digit 7-rank portion 2 and a shaft portion 3.
An input member 4 is attached to the tip of the shaft part 3 which is fixed to the engine side outside the rank part 2 diagram.

A body member 7 rotatably attached to the input shaft 1 via a bearing 6, and a biasing bar member 7 form an annular chamber 8t between their opposing inner surfaces, and the outer 8 bolt 9
. . . The output members are all fixed to each other by VC. In the annular chamber 8, the force/branch member 7 is fixedly attached.
'1. , a partition plate 10 having left and right communication holes 10α;
Cover the communication hole 10ak11. A work chamber 12 and a storage chamber 13 are separated by a closable valve plate 11. 14 A communicating hole provided in the member 7 and connecting the working chamber 12 and the storage chamber 13.

15ij Temperature sensitive member and 1 and 7 spiral shape (Imetal), force is applied to the outer peripheral end of this jL (fixed to one member 7 fL, inner end is rotatable to one member 7 with cover 411jm 71 It is fixed to one end of the center bin 16 71.The other part of the center bin 16 is fixed to the pulp grate 11.
There are 6. (Thus, the valve plate 11 rotates 11 around the center bin 16 in response to the operation of the bimetal 16 in response to changes in ambient temperature. .

The input member 4 is rotatably mounted in the working chamber 12, and there are a through hole 17 near the center and a through hole 18 near the outer periphery that communicate with the input member 4 from side to side. perforated n
ing. 11. of the facing surfaces of the input member 4 and the body member 6;
zotr, K /d 4) I several annular grooves 4α.

6a is provided fL, and a shear space designated by S is formed tr.

Further, the rr friend communication hole 14 provided in the cover member 7,
The vicinity of the opening end W on the working chamber 12 side is provided with a protrusion 20 in the direction of the working chamber 12 as shown in FIGS. 2 and 3,
, forming a bong portion to be described later.

Further, the side surface vc of the body member 6 facing the peripheral edge of the input member 4 has a working chamber 12 having a desired circumferential length.
A projection 19 in the direction is provided. 21 and 22.23 are knock pins and protrusions 19°20Vc so that the protrusions 19 and 201 are set in positions facing each other.71. A dowel pin 21 has one end side connected to one pin receiving hole 22Vc@III, and is implanted approximately in the center of the protrusion 19. Then, when the cover member 7 and the body part #6 are fixed with bolts e...K, when the protrusions 19 and 20 are in the normal opposing positions, the other end of the dowel pin 21 is inserted into the other bottle receiving hole 23. The cover member 7 and the peripheral edge 7 of the body member 6 are fitted together.
a, 5b are brought into close contact with each other, suggesting that the protrusions 19 and 20 are in the normal opposing position, and when the protrusions 19 and 20 are not in the normal opposing position f, the tip of the K11-1 dowel pin 21 is attached to the cover member. The dove edge portions 7G and 6bf are kept in a non-contact state by contacting the inner surface of the dovetail portion 7, indicating that the protrusions 19 and 20 are not in a normal opposing positional relationship. Then, there is a dowel pin 21 and a bottle receiving hole 22.
23'J-Using K: With the protrusions 19 and 20 set in positions facing each other, the cover member 7 and the body member 6I/i are machined and fixed to the bolts 9. 24 is a body member 6 and a cover member 7 which are output members.
It is a 7 unblade fixed at 25.

In such a configuration, the storage chamber 13vC is filled with a desired amount of working fluid, and the input member 4 rotates via the input shaft 1 with the engine VCL (not shown) (2. When the ambient temperature near the bimetal 16 rises, , bimetal 16 is rLv
In response, the valve plate 11 is rotated via the center bin 18, and the partition plate 1 by the pulp grate 11 is rotated.
The cover of the communication hole 1oa provided in 0C is gradually released to allow the fluid in the opening 1-1 storage chamber 13 to flow into the working chamber 12, and the shear space 5P3t- is filled with the fluid. here,
The torque transmitted from the input member 4 to the output member body member 6 and cover member 7 is expressed as a function of the amount of fluid in the working chamber 12, %, and as a function of the amount of fluid in the shear space S and 1° fL. Ru. Therefore, the unblade 24J" is fixed to the body member 5" which is the output member and the cover member 7.
At t, the fluid fills the shear space S and increases the rotational speed 12 to cool the engine. Next, work room 1
The fluid in 2 is moved outside the working chamber 12 by the centrifugal force VCX.
fl [direction, inflow into the pump section -r]. Then, since the human power member 41-j is rotated t~ in the direction of the arrow X shown in FIG.
k517, this fluid is formed by the protrusion 20 provided on the cover member 7 and the body member 5vC provided with γ1. It collides with each tip surface 20a, 196 of the projection 19, where the pressure is increased and subjected to a pump action, and the 14 fluid σ communication holes 1. Then feed the storage room 13Vr.
＋、ru.

On the other hand, when the ambient temperature near the bimetal 16 drops -r, the metal 16 reacts to the LK response [7, pulp play) 11t, and the communication hole 1oak of the partition plate 1o is blocked 17, and from the storage chamber 13 to the work chamber 12. It helps in supplying fluid to. Therefore, the fluid in the working chamber 12 is stored in the bong action Vr storage chamber 13, and the amount of fluid in the n1 shear space S is reduced (1, the rotational speed between the input member 4 and the output member 6.7 The difference increases and the fan blade 21 rotates at idle.At this time, the protrusions 19 and 20 push the fluid between the input member 4 and the output members δ and 7 through the communication hole. In order to efficiently send the fluid into the storage chamber 14, almost all of the fluid can be accommodated in the storage chamber 13 without any fluid remaining between the input member 4 and the output member 6. The idle rotation speed of the blade 21 increases [7.
l,ru.

Moreover, in this case, the axial clearance between the input member 4 and the output member 6.7 in the working chamber 12 is
Since the gap is sufficiently wide other than the part provided with i, the shear resistance of the fluid remaining in the gap occurs only in the protrusion 19.
, 20 only, and there is almost no problem occurring in other parts. Therefore, the previous torque U of the output member 6.7 is 1
, and the idle rotational speed of the output member 6.7 can be sufficiently reduced. In the embodiment shown in the drawings, the knock bottle 21 is implanted into the projection 20Vζ by fitting one end side into the bottle receiving hole 22 provided in the projection 20. You may.

Tatami facing - MLJj5KIEllt% material, comprising a working fluid storage chamber and a working chamber 12, an output member having a communication hole opening between both chambers, and an output member π pair 1. and an input member that can rotate relative to each other through the fluid in the working chamber (7).

In fluid couplings that transmit torque between output members,
Protrusions extending into the working chamber are provided on both the body member and the cover member in the vicinity of the opening end of the communicating hole in the working chamber, and knock pins are provided on the protrusions for setting tK in positions facing each other. Since a bottle receiving hole is provided, when the dowel pin and the bottle receiving hole K are inserted, the protrusions provided on the body member and the cover member will be set in positions facing each other. When attempting to idle the output member by effectively circulating the fluid in the working chamber into the storage chamber with the efficient pump action of the The speed can be reduced. (9) In the present invention, like the projection, the knock bottle also has an oil flow 71. in the outer direction of the wheel. Since the pump action is performed by blocking the oil, the oil discharging force is greater than when using only the protrusions.
It will increase even more. In addition, the relative gap between the input member and the output member is made sufficiently wide except for the part where the protrusion formed on the output member faces, so that if fluid remains in the relative gap, Therefore, the idle rotation speed of the output member can be sufficiently reduced, thereby reducing the wasted horsepower consumed during idle rotation (- thereby saving energy). Together with this, a total of 11 fluid couplings with outstanding performance can be created.

[Brief explanation of the drawing]

Figure 1 shows the structure of the cooling fan device! 2 is an enlarged sectional view of the main part of FIG. 1, and FIG. 3 is a sectional view taken along the line III-Ill of FIG. 2. Figure 4 is a sectional view taken along the line ■-■ in Figure 2. 4.4A, 4B...Input member, 6...Body member (
output member), 7... cover member (output member), 12.
...Working room, 13...Storage room, 14...Communication hole, 1
9゜20...Protrusion, 21...Knock bottle, 22.2
3... Bottle hole. Figure 2

Claims (1)

[Claims] (1) Consisting of a body member and a cover member, the working fluid storage chamber and the working chamber are fully formed; [7] In a fluid coupling that is composed of an input member that is relatively rotatable and that transmits torque between the input and output members at the fluid needle valve 1 in the working chamber, Both the body member and the cover member are provided with protrusions that extend into the working chamber, and the protrusions are provided with knock bottles and bottle receiving holes for fully facing each other. A fluid coupling characterized by: