JPH01112032A - Clutch mechanism - Google Patents

Abstract

PURPOSE:To reduce the weight and the size of a mechanism, to eliminate the need to decide a gap between the drive side and the driven side during inoperation with high precision, and to reduce a cost, by a method wherein, through expansion of a resilient hollow body, the resilient hollow body is friction-engaged with a rotary member, rotation of a rotation drive source is transmitted to a driven part, and though contraction of the hollow body, the hollow body is released from the rotary member. CONSTITUTION:When a resilient hollow body 133 is expanded, the outer peripheral surface thereof is brought into frictional engagement with an inner peripheral surface 131d of an outer peripheral cylinder part 131b to transfer rotation of a pulley 131 to a rotary shaft 121. When the resilient hollow part 133 is contracted, the outer peripheral surface thereof is released from the inner peripheral surface 131d, and rotation of the pulley 131 is not transmitted to the rotary shaft 121. Since, as noted above, a clutch mechanism 130 is not an electromagnetic clutch, structure thereof can be simplified and decreased in weight and size. Since expansion and contraction of the resilient hollow body 133 is utilized, there is no need to decide a gap between the inner peripheral surface 131d of the pulley 131 and the resilient hollow body 133 with high precision, and the clutch mechanism can be manufactured at a low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a clutch mechanism that cuts off transmission of driving force to, for example, a compressor of an automobile air conditioner.

[Conventional technology and problems]

Conventionally, this type of clutch mechanism uses an electromagnetic clutch. That is, by energizing a solenoid coil provided on the fixed side, the armature is displaced and brought into close contact with the rotor, thereby transmitting the rotational force of the drive source to the compressor.

However, in order to transmit the rotational force to drive the compressor, it is necessary to supply 30 to 6 degrees W of power to the solenoid coil, and for this reason, the solenoid coil usually turns the copper wire about 30 turns. There is a problem in that the weight and size of the clutch mechanism increases.

Furthermore, with conventional clutch mechanisms, if the size of the gap between the armature and rotor at the time of disconnection is inaccurate, the intermittent operation between the armature and rotor will be insufficient, so the problem is that the gap must be determined with high precision. There is.

The present invention has been made with the object of providing a clutch mechanism that is light and compact, and does not require highly accurate determination of the gap between the driving side and the driven side when inactive.

[Means for solving problems]

The clutch mechanism according to the present invention is connected to a rotational drive source,
a rotary member rotatably provided around the axis, and a rotary member connected to the driven portion, coaxially disposed with respect to the rotary member, rotatably rotatable about the axis, and capable of expanding and contracting. The device includes an elastic hollow body and a control mechanism that expands or contracts the elastic hollow body by controlling the supply and discharge of pressure fluid to the elastic hollow body, and the elastic hollow body expands to cause the rotation member to expand or contract. The rotational drive source transmits the rotation of the rotational drive source to the driven part, and is contracted and released from the rotating member.

〔Example〕

The present invention will be explained below based on illustrated embodiments.

FIG. 1 shows a compressor 100 to which a clutch mechanism according to an embodiment of the present invention is applied. In this figure, a compressor housing 101 is formed with a suction port 102 and a discharge boat 103. The rotor 104 has a large diameter portion 1
04 a and small diameter parts 104 b and 104 c, the small diameter parts 104 b and 104 c are the housing 10
The large diameter portion 104a is rotatably supported by wall members 105 and 106 provided in the wall member 105 and 106.
It is accommodated in a cylindrical member 107 disposed between them. Vanes 108 extend radially from rotor 104 and vanes 108 extend radially from rotor 104 .
The tip of the vane 1 is in sliding contact with the inner wall surface of the cylindrical member 107.
08, a pressure chamber is formed by the rotor 104 and the cylindrical member 107. A hole 111 formed in the cylindrical member 107 is opened and closed by a reed valve 112. Stopper 113 limits the opening degree of reed valve 112.

As is conventionally known, the volume of the pressure chamber changes with the rotation of the rotor 104, whereby the refrigerant sucked from the suction boat 102 flows through holes (not shown) formed in the wall member 105.
is led to a pressure chamber and pressurized. Then, the pressurized refrigerant is discharged from the hole 111 by opening the reed valve 112 and discharged from the discharge port 103 to the outside of the compressor.

A rotating shaft 121 connected to the tip of the small diameter portion 104 b of the rotor 104 is connected to a clutch mechanism 130 . The clutch mechanism 130 is connected to the output shaft (
A rotating member or pulley 13 (not shown) connected to
1, and an elastic hollow body 133 connected to the rotating shaft 121 of the compressor via a hub 132.

The huff 132 includes an inner cylindrical portion 132a connected to the rotating shaft 121 via a spline 134, and the inner cylindrical portion 1
32a, and an annular portion 132 that connects these cylindrical portions 132a and 132b.
It has c. The elastic hollow body 133 has an outer cylindrical portion 132
It is fixed to the outer peripheral surface of b. The hub 132 is attached to the rotary shaft 121 by a port 135 screwed onto the end surface of the rotary shaft 121.
1 is prevented from coming off, and the spline 13
Both ends of 4 are sealed with sealing materials 136 and 137 such as copper washers.

The pulley 131 is connected to the inner cylindrical portion 132 of the hub 132.
Support cylindrical part 13 located between a and outer cylindrical part 132b
1a, an outer peripheral cylinder part 131b surrounding the outer peripheral surface of the elastic hollow body 133, and a cover part 131c that connects these support cylinder part 131a and the outer peripheral cylinder part 131b and covers one side of the elastic hollow body 133. have The support cylindrical portion 131a is connected to the inner cylindrical portion 132 of the hub 132 via a bearing 138.
It is rotatably supported by a. The outer cylindrical portion 131b is connected to an output shaft of an engine (not shown) via an endless belt, and is rotationally driven by the engine.

The elastic hollow body 133 transmits the rotation of the pulley 131 to the rotating shaft 121 of the compressor.
1, and the outer circumferential surface of the elastic hollow body 133 is arranged coaxially with respect to the inner circumferential surface 131 of the outer circumferential cylinder portion 131b of the pulley 131.
It is close to d. Further, the elastic hollow body 133 expands or contracts depending on the pressure of the pressure fluid, ie, the refrigerant, introduced into the interior thereof. When the elastic hollow body 131 expands, its outer circumferential surface frictionally engages with the inner circumferential surface 131 d of the outer circumferential cylindrical portion 131 b, whereby the rotation of the pulley 131 is caused by the rotation axis 12.
1 and when the elastic hollow body 131 contracts, its outer peripheral surface is released from the inner peripheral surface 131 d, and the rotation of the pulley 131 is not transmitted to the rotating shaft 121.

FIG. 2 shows the structure of the elastic hollow body 133. The outer member 133a of the elastic hollow body 133 is mainly made of synthetic rubber, and the inner member 133c of the elastic hollow body 133 is made of steel wire cord or This is a reinforcing member formed by stacking several layers of fiber cords with low elongation, thereby increasing the longitudinal and lateral spring constants of the elastic hollow body 133.

A control mechanism for expanding or contracting the elastic hollow body 133 by controlling the supply and discharge of pressure fluid, that is, refrigerant, to the elastic hollow body 133 will be explained.

Referring again to FIG. 1, one end of the passage 141 bored in the hub 132 communicates with the elastic hollow body 133, and the other end of the passage faces between the spline 134 and the sealing material 137.
It communicates with one end of a passage 142 formed in the rotating shaft 121. The other end of the passage 142 of this rotating shaft 121 is connected to the rotating shaft 1
It communicates with an annular groove 144 formed on the inner circumferential surface of an annular member 143 that fits into the annular member 21 . A communication hole 145 extending in the radial direction is connected to the annular groove 144 , and the communication hole 145 communicates with a passage 146 bored in the housing 101 . This passage 146 opens on the outer surface of the housing 101 and is connected to the control line 201 of the fluid circuit shown in FIG.

Therefore, the elastic hollow body 133 has passages 141, 142,
It is constantly communicated with the control line 201 via the annular groove 144, the communication hole 145, and the passage 14G.

FIG. 3 shows a fluid circuit of an air conditioner using this embodiment. A condenser 203, a receiver 204, an expansion valve 205, and an evaporator 206 are provided in the middle of a refrigerant circulation line 202 extending from a discharge port 103 of the compressor 100 and connected to the suction port 102. As is conventionally known, the gaseous refrigerant discharged from the comb refrigerant 100 is passed through the condenser 20.
3, the liquid refrigerant is liquefied and temporarily stored in the receiver.
6 vaporizes. The gaseous refrigerant flows into the compressor 100 from the suction port 102, and the same operation is repeated thereafter.

In this embodiment, the high pressure liquid refrigerant is transferred to the clutch mechanism 13.
A structure is provided for guiding the elastic hollow body 133 at 0.0.

Accumulator 210 is connected to receiver 204 via check valve 221 and holds high pressure liquid refrigerant. The accumulator 210 includes a check valve 21 in a casing 211.
A pressure chamber 214 formed above the piston 212 is supplied with high-pressure refrigerant from the receiver 204. A spring 216 is provided in a spring chamber 215 formed below the piston 212 to bias the piston 212 toward the pressure chamber 214. The check valve 213 opens when the pressure within the pressure chamber 214 is equal to or higher than a predetermined value, and releases the refrigerant into the spring chamber 215 . The spring chamber 215 is connected to the refrigerant circulation line 202 downstream of the evaporator 206 via the reflux line 209 .

Thus, 8 to 10 kg/cd of liquid refrigerant is held in the pressure chamber 214 when the compressor 100 is operating. The pressure of this liquid refrigerant changes depending on the load on the compressor 100.

The pressure chamber 214 is connected to a control valve 220 via a high pressure line 207.
The elastic hollow body 133 (FIG. 1) is connected to the second boat 221 of the control valve 220 via the control line 201.
It is connected to a boat 222. The control valve 220 is a two-position three-boat valve, and the third port 223 is connected to the refrigerant circulation line 202 downstream of the evaporator 206 via the low pressure line 208. The control valve 220 is a solenoid valve, and when not in operation,
The first position shown shuts off high pressure line 207 and connects control line 201 to low pressure line 208 .

As a result, the refrigerant in the elastic hollow body 133 is transferred to the control line 2
01, through the low pressure line 208 and the refrigerant circulation line 202 to the suction port 102 into the compressor 100, whereby the elastic hollow body 133 contracts and is released from the pulley 131. On the other hand, when the control valve 220 is energized and in the second position, the low pressure line 20B is cut off while the high pressure line 207 is communicated with the control line 201. As a result, the high-pressure refrigerant in the accumulator 210 is forced through the high-pressure line 207 and the control line 201 to the elastic hollow body 133, and the elastic hollow body 133 expands and comes into close contact with the inner peripheral surface 131d of the pulley 131.

Therefore, the elastic hollow body 133 and the pulley 131 are interconnected, and the rotation of the pulley 131 is transmitted to the elastic hollow body 133, thereby driving the compressor 100 to rotate.

When the compressor 100 is in operation, the pressure of the refrigerant in the elastic hollow body 133 changes according to the magnitude of the load on the compressor 100, and as the load increases from low to high, the pressure of the refrigerant in the elastic hollow body 133 changes from 8 kg /
Changes from ctl to 10kg/cd. Therefore, the higher the load, the higher the pressure of the refrigerant, and the more the elastic hollow body 133
The expansion rate of the pulley 131 increases, and the connecting force to the pulley 131 increases. On the other hand, when the control valve 220 is switched and the refrigerant in the elastic hollow body 133 flows back to the suction boat 102,
The refrigerant pressure inside the elastic hollow body 133 is approximately 2 kg/ctA
decreases to Which causes the elastic hollow body 133 to contract,
The pulley 131 is released from the inner peripheral surface 131d, the rotation of the pulley 131 is not transmitted to the elastic hollow body 133, and the compressor 100 stops.

Immediately after the compressor 100 stops, the pressure in the low pressure line 208 drops to about 2 kg/- as described above, but the pressure in the refrigerant circulation line 202 drops to about 1.5 kg/- immediately before the compressor 100 stops.
kg/aa, and after a long time has passed after stopping, line 2
02, 208 pressure will be about 5 kg/cd.

However, this pressure of about 5 ngi/c11 is
3 is not so high as to bring it into close contact with the pulley 131, and the elastic hollow body 133 remains released from the pulley 131.

Furthermore, when the compressor 100 is stopped, the pressure in the pressure chamber 214 is reduced to approximately 8 k due to the action of the check valves 213 and 221.
g/d. Therefore, the control valve 220
When the elastic hollow body 133 is switched, sufficient pressure is supplied to the elastic hollow body 133 and the elastic hollow body 133 is connected to the pulley 131.

In this manner, the present embodiment is configured to perform on/off control of the clutch mechanism 130 by expanding and contracting the elastic hollow body 133. That is, since the clutch mechanism 130 is not an electromagnetic clutch, an excitation coil is not required, and its structure is simple, lightweight, and small.

Furthermore, since the present clutch mechanism 130 utilizes the expansion and contraction of the elastic hollow body 133, there is no need to define the gap between the inner circumferential surface 131d of the pulley 131 and the elastic hollow body 133 with high precision, and it is inexpensive. be. Furthermore, the elastic hollow body 13
3 can absorb torque fluctuations of the engine and compressor, and the rotation of the compressor 100 becomes smooth.

Note that the fluid that applies control pressure to the elastic hollow body 133 is
The refrigerant is not limited to the refrigerant of the compressor 100, but may be introduced from outside the air conditioner, for example, the oil pressure of the power steering or the high pressure air of the brake system may be used.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to obtain a clutch mechanism that is lightweight and compact, and has a simple structure that does not require highly accurate determination of the gap between the drive side and the driven side when the drive side is not in operation.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view showing an elastic hollow body, and FIG. 3 is a fluid circuit diagram of an air conditioner. . 131... Pulley (rotating member), 133... Elastic hollow body, 210... Accumulator, 220... Control valve.

Claims (2)

[Claims] 1. A rotating member connected to a rotational drive source and rotatably provided around an axis, and a rotating member connected to a driven part, coaxially disposed with respect to the rotating member, and rotatably rotatable around an axis. The elastic hollow body is provided with an elastic hollow body that can expand and contract, and a control mechanism that expands or contracts the elastic hollow body by controlling the supply and discharge of pressure fluid to the elastic hollow body, and the elastic hollow body expands or contracts. A clutch mechanism characterized in that the clutch mechanism is frictionally engaged with the rotating member to transmit the rotation of the rotational drive source to the driven part, and is contracted and released from the rotating member. 2. 2. The clutch mechanism according to claim 1, wherein the driven part is a compressor of an air conditioner, and the pressure fluid is a refrigerant of the air conditioner.