JPH0533785Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial field of application] This invention relates to a compressor drive device, and in particular, the compressor is automatically driven in two directions according to the engine speed.
The present invention relates to a compressor drive device which can perform quick switching drive control, easily manufacture and assemble parts, protect pulleys, effectively prevent belt coming off, and can be made compact.

[Background Art] Vehicles are equipped with air conditioners (temperature and humidity control devices) to maintain the air inside the vehicle cabin in a comfortable state for passengers at all times.

This air conditioner is constructed by combining a heating exchanger and a cooling evaporator, and adjusts the temperature and humidity of the air inside the vehicle throughout the four seasons. The air conditioner has a compressor driven by the driving force of an internal combustion engine. In this compressor, a pulley attached to the protruding end of a rotating shaft provided on the main body of the compressor is rotated by the driving force of the internal combustion engine via a belt, and the rotating shaft is rotated to drive the refrigerant gas. It sucks in and compresses it, raises it to high temperature and pressure, and sends it to the condenser.

This compressor is generally driven and controlled by an electromagnetic friction clutch. The on/off operation of this electromagnetic friction clutch is performed by controlling the supply/disconnection of current to the electromagnetic coil. The supply and disconnection of current to this electromagnetic coil is controlled by the driver turning the air conditioner main switch on and off, the accelerator pedal being depressed,
This is done based on conditions such as a temperature switch installed in the vehicle interior or a pressure sensor in the air conditioner.

[Problems to be Solved by the Invention] Conventionally, there has been a problem that the cooling capacity decreases when the engine speed is low, that is, when the compressor is driven at low speed.

Therefore, in order to ensure a predetermined cooling capacity, it has been considered to equip a large compressor or increase the pulley ratio to drive the compressor at high rotation speed.

However, when a large compressor is used, there arises the disadvantage that it is large and heavy. In addition, when the engine speed increases and the compressor is driven at high speed, noise increases, and
There was an inconvenience that the air conditioner became overcooled and fuel consumption deteriorated.

Further, a compressor driving device is disclosed in, for example, Japanese Utility Model Application No. 57-180179.
The device described in this publication includes two pulleys with different diameters and two electromagnetic clutches that disconnect and disconnect transmission to the rotating shaft. However, this device has disadvantages such as the need for two electromagnetic clutches, which increases the number of parts, complicates the configuration, makes maintenance and inspection difficult, and increases costs. .

Furthermore, as a drive device for a compressor, there is, for example, one shown in FIGS. 6 and 7. This 6th and 7th
The device shown in the figure is designed to automatically switch the compressor 2 to second speed and control the drive.
It has second pulleys 8, 10, a first clutch 28 which is an electromagnetic friction clutch, a second clutch 50 which is a centrifugal clutch, and a third clutch 66 which is a one-way clutch.

However, the clutch transmission member 70
the first pulley 8 on the side and the second pulley 8 on the protruding end side of the rotating shaft 6
Since the configuration is such that it is sandwiched between the pulleys 10, the base 72 of the clutch transmission member 70 and the connecting portion 7
4 has a sloped step, which makes the shape complicated and difficult to manufacture.

[Purpose of the invention] Therefore, in order to eliminate the above-mentioned inconvenience, the purpose of this invention is to fix the hub fixing part of the hub to the protruding end of the rotary shaft of the compressor body, and to fix the hub fixing part of the hub on the main body side than the end face of the hub fixing part. The rotating shaft is fitted with a sealing material,
The sealing material is provided with a holding member spaced apart from the hub fixing portion and oriented in the axial direction of the rotating shaft, a clutch transmission member is provided on the holding member via the first bearing, and the clutch transmission member is connected to the base. a sloping step section provided and oriented outward to separate from the main body; a connecting section connected to the slanted step section and oriented in the radial direction of the rotating shaft; and a connecting section connected to the connecting section and oriented in the axial direction of the rotating shaft; The base includes an inner part that contacts the first bearing and is oriented in the axial direction of the rotating shaft, and an electromagnetic transparent part that is oriented in the radial direction of the rotating shaft and has an adsorption surface on the outer side. and an outer portion spaced apart from the inner portion and oriented in the axial direction of the rotating shaft, forming a coil accommodating portion that opens toward the main body, and the electromagnetic coil of the first clutch is housed in the coil accommodating portion, A second clutch accommodating portion that opens toward the main body is formed by the inclined step portion, the connecting portion, and the connecting/separating portion.
The clutch weight of the clutch is accommodated, the inside of the folder plate is fixed to the hub ring part of the hub, the driven plate of the first clutch is fixed to the outside of the folder plate, and the driven plate is fixed to the electromagnetic transparent part. The drive plate is disposed in an end space formed outwardly by the sloping stepped portion, and the driven plate has a contact surface that comes into contact with and separates from the suction surface, and a second bearing is provided on the outer side of the base. a first support part of the first pulley formed to have a smaller diameter than the contact/separation part; a connecting part of the first pulley is fixed to the clutch weight;
A third clutch and a third bearing are fitted in parallel on the outer side of the base on the side closer to the main body than the pulley, a second support portion of the second pulley is provided on the third clutch and the third bearing, and the second pulley By making the diameter of the first pulley larger than that of the first pulley, the compressor can be controlled to automatically switch to second speed according to the engine speed, increasing the cooling capacity when the engine speed is low, while increasing the engine speed. It reduces noise when the number is high, prevents overcooling, improves fuel efficiency, makes it easier to assemble and manufacture parts, protects pulleys, and prevents belts from coming off. To realize a compressor drive device which can effectively prevent the problem and can be made compact.

[Means for Solving the Problems] In order to achieve this object, this invention rotates a first pulley and a second pulley of different diameters provided on the rotating shaft of the main body of the compressor, thereby improving the speed of the compressor. In a compressor drive device that automatically switches drive control to second speed, a hub fixing part of a hub is fixed to a protruding end of the rotating shaft, and the rotating shaft is located closer to the main body than the end face of the hub fixing part. A sealing material is fitted to the sealing material, and the sealing material is provided with a holding member spaced apart from the hub fixing portion and oriented in the axial direction of the rotating shaft, and the holding member is provided with a clutch transmission via a first bearing. A member is provided, the clutch transmission member is connected to a base portion, an inclined step portion connected to the base portion and oriented outwardly to be separated from the main body, and a slant step portion connected to the inclined step portion and oriented in the radial direction of the rotating shaft. a connecting part connected to the connecting part and a contacting/separating part connected to the connecting part and oriented in the axial direction of the rotating shaft and toward the main body; an electromagnetic transparent part that is oriented in the radial direction of the rotating shaft and has an adsorption surface on the outside; and an outer part that is spaced apart from the inner part and oriented in the axial direction of the rotating shaft. A coil accommodating portion is formed that opens toward the main body, and the electromagnetic coil of the first clutch is housed in the coil accommodating portion, and the coil accommodating portion is opened toward the main body by the inclined step portion, the connecting portion, and the connecting/separating portion. forming a second clutch housing;
The second clutch accommodating portion is provided with a clutch weight of the second clutch accommodated therein, the inside of a folder plate is fixed to the hub ring portion of the hub, and the outside of this folder plate is provided with the clutch weight of the second clutch. A driven plate is fixedly installed, the driven plate is disposed in an end space formed outwardly by the electromagnetic transparent part and the inclined step part, and the driven plate is brought into contact with and separated from the suction surface. a first support part of the first pulley forming a contact surface and having a smaller diameter than the contact/separation part is provided on the outer side of the base via a second bearing, and a connecting part of the first pulley; is fixed to the clutch weight, and a third clutch and a third bearing are fitted in parallel to an outer side of the base closer to the main body than the first pulley,
A second support portion for the second pulley is provided on the third clutch and the third bearing, and the second pulley is connected to the first pulley.
It is characterized by being formed with a larger diameter than the pulley.

[Operation] According to the configuration of this invention, when the engine speed is less than a set value, the driving force of the internal combustion engine is transmitted to the rotating shaft by the first pulley to drive the compressor at high rotation speed, thereby increasing the cooling capacity. On the other hand, when the engine speed exceeds the set value, the driving force of the internal combustion engine is transmitted to the rotating shaft by the second pulley to drive the compressor at low rotation speed, thereby reducing noise and overloading. It is possible to prevent air conditioning and improve fuel efficiency.

Also, on the outer side of the base of the clutch transmission member, a first
Since the second pulley is attached, the first and second pulleys can be assembled to the clutch transmission member in advance during assembly, making assembly easy.

Furthermore, since the first and second pulleys are surrounded by the inclined stepped portion, the connection portion, and the contact/separation portion of the clutch transmission member, there is no need for a cover or other member to protect the first and second pulleys. The score can be reduced.

Furthermore, since the belt wound around the first pulley is disposed between the second pulley and the clutch weight of the second clutch, it is possible to effectively prevent the belt from coming off.

Further, since the driven plate of the first clutch is disposed in the end space formed outwardly by the base of the clutch transmission member and the inclined step, the driven plate protrudes in the axial direction of the rotating shaft. Therefore, it is possible to protect the driven plate and make it more compact.

[Example] Hereinafter, an example of this invention will be described in detail and specifically based on the drawings.

1 to 5 show examples of this invention. In the figure, 2 is a compressor of an air conditioner installed in a vehicle (not shown), and 4 is the main body of this compressor 2. This main body 4 is provided with a rotating shaft 6. A V-groove type first pulley 8 and a V-groove type second pulley 10 having a larger diameter than the first pulley 8 are attached to the protruding end of the rotating shaft 6.
is installed. The first pulley 8 is the second pulley 1
It rotates at approximately twice the speed of 0. A V-belt connected to a crank pulley attached to an end of a crankshaft, which is a rotating body of an internal combustion engine (not shown), is wrapped around the first and second pulleys 8 and 10, respectively.

A hub fixing portion 12a of the hub 12 is screwed and fixed to the protruding end of the rotating shaft 6. A mounting bolt 14 is provided on the end surface of the rotating shaft 6 to prevent the hub 12 from falling off.
is fixed.

A sealing material 18 is fitted and provided on the rotating shaft 6 closer to the main body 4 than the end surface of the hub fixing portion 12a.

This sealing material 18 includes a holding member 1 that is spaced apart from the hub fixing portion 12a and oriented in the axial direction of the rotating shaft 6.
6 is provided.

A first bearing 2 is provided on the outer peripheral portion of the holding member 16.
0, a clutch transmission member 22 is provided.
This clutch transmission member 22 is selectively connected to either the first pulley 8 or the second pulley 10.

As shown in FIG. 3, the clutch transmission member 22 has a base 24, and is connected to the base 24 in a slightly outward direction so as to be separated from the main body 4, that is, a rotating shaft 6.
an inclined step portion 44 extending diagonally toward the end face side; a connecting portion 40 connected to the inclined step portion 44 and oriented in the radial direction of the rotating shaft 6; 6 and a contact/separation portion 42 oriented toward the main body 4 side.

The base portion 24 of the clutch transmission member 22 includes an inner portion 24a that is in contact with the outer peripheral surface of the first bearing 20 and oriented in the axial direction of the rotating shaft 6, and an outer portion 24a that is oriented in the radial direction of the rotating shaft 6, that is, an outer portion 24a of the rotating shaft 6. It opens to the main body 4 side by an electromagnetic transparent part 24b having an adsorption surface 32 on the end surface side and an outer part 24c that is spaced apart from the inner part 24a and oriented in the axial direction of the rotating shaft 6 and parallel to the inner part 24a. A coil housing portion 26 is formed. In other words, base 2
4 is an inner part 24a, an electromagnetic transparent part 24b, and an outer part 2.
4c, the cross section is formed into a C-shape.

A first clutch 28 is provided in the coil housing portion 26.
The electromagnetic coil 30 that constitutes the is housed.

When the electromagnetic coil 30 generates an electromagnetic force, an abutment surface 36 formed on a driven plate 34 constituting the first clutch 28 is attracted to and abuts on the attracting surface 32 by the electromagnetic force.

That is, the hub 1 is oriented in the radial direction of the rotating shaft 6.
The inner side of the folder plate 38 is fixed to the second ring portion 12b. A driven plate 34 is fixed to the outside of this folder plate 38. Accordingly, the first clutch 28 is constituted by an electromagnetic friction clutch consisting of an electromagnetic coil 30 and a driven plate 34.

The folder plate 38 contacts the contact surface 3 of the driven plate 34 when the driven plate 34 is displaced by the electromagnetic force of the electromagnetic coil 30.
6 is formed of a flexible member so as to easily come into close contact with the attraction surface 32 of the electromagnetic transparent portion 24b.

In the clutch transmission member 22, a second clutch accommodating portion 46 that opens toward the main body 4 is formed by the inclined step portion 44, the connecting portion 40, and the contact/separation portion 42. A clutch facing 52 and a clutch weight 54 of a second clutch 50 are disposed in the second clutch receiving portion 46 .

Also, the driven plate 3 of the first clutch 28
4, the inclined step portion 44 and the electromagnetic transparent portion 24b of the base portion 24;
The rotary shaft 6 is disposed in an end space S formed outwardly by the rotary shaft 6, and does not protrude in the axial direction of the rotating shaft 6.

A second bearing 4 is provided on the outer side 24c of the base 24.
8, the first pulley 8 has a smaller diameter than the contact/separation part 42.
A first support portion 8a is attached and provided. That is, the first belt winding portion 8c of the first pulley 8 is formed to have a smaller diameter than the contact/separation portion 42.

A clutch facing 52 of a second clutch 50, which is a centrifugal clutch, is connected to and separated from the inner circumferential surface of the contacting and separating portion 42. The second clutch 50 presses the clutch facing 52 against the approaching/disengaging portion 42 when the engine speed Ne is less than the set value Ne ₁ , and presses the clutch facing 52 against the approaching/separating portion 42 when the engine speed Ne is equal to or higher than the set value Ne _1. 42, and is constructed as shown in FIG.

That is, the first weight portion 56 of the clutch weight 54 is provided on the inner peripheral surface of the clutch facing 52.
are provided so that they can be brought into contact and separated. This first weight part 5
A second wet portion 58 is connected to the second wet portion 6 . A connecting portion between the first weight part 56 and the second weight part 58 is pivotally supported by an anchor 60. One end of a clutch spring 62 is fixed to the anchor 60. The other end of this clutch spring 62 is fixed to the end of the second weight portion 58 of another adjacent clutch weight 54. In addition, the first weight portion 56 of the clutch weight 54
When the anchor 60 rotates toward the center, the stopper 64 restricts the rotation.

The second clutch 50 includes a clutch weight 54 and a clutch spring 62 as shown in FIG.
and a stopper 64 are arranged at four locations at equal intervals around the circumference. Also, clutch weight 5
4 is fixed to the side surface of the connecting portion 8b of the first pulley 8.

Outer portion 24 of base 24 of clutch transmission member 22
c is provided with a third clutch 66 and a third bearing 68 fitted in parallel. A second support portion 10a of the second pulley 10 is fitted into the outer peripheral portion of the third clutch 66 and the third bearing 68. The side wall 10b of this second pulley 10
It is disposed close to the first belt wrapping portion 8c of the pulley 8. Further, the second belt winding portion 10c of the second pulley 10 is formed to have a larger diameter than the contact/separation portion 42.

The third clutch 66 is a one-way clutch that transmits power only in one direction, and does not transmit the rotation of the second pulley 10 to the clutch transmission member 22 when the engine speed is less than a set value _Ne1 , but when the engine speed is less than the set value Ne1, the third clutch 66 is a one-way clutch that transmits power only in one direction. is greater than the set value Ne ₁ , the rotation of the second pulley 10 is transmitted to the clutch transmission member 22 .

Note that the current to the electromagnetic coil 30 is supplied or cut off depending on conditions such as the air conditioner main switch, the depression state of the accelerator pedal, a temperature sensor provided in the vehicle interior, and a pressure sensor of the air conditioner.

Next, the operation of this embodiment will be explained.

For example, when an air conditioner main switch is turned on, current flows through the electromagnetic coil 30, and the electromagnetic coil 30 generates electromagnetic force. The driven plate 34 is absorbed and displaced by this electromagnetic force,
From this, the adsorption surface 3 of the electromagnetic transparent part 24b of the base 24
The abutment surface 36 of the driven plate 34 is in close contact with 2. At this time, the folder plate 38 connecting the hub ring portion 12b of the hub 12 and the driven plate 34 is bent, so that the contact surface 36 easily comes into close contact with the suction surface 32. That is, the first clutch 28 is in the connected state.

Then, the engine speed is the set value Ne ₁ (see Figure 5)
Below, the first weight portion 56 of the clutch weight 54 of the second clutch 50 is pressed against the clutch facing 52 by the biasing force of the clutch spring 62. Therefore, the contact/separation portion 4 between the clutch facing 54 and the clutch transmission member 22
2 are in pressure contact with each other, and the clutch facing 52 and the clutch transmission member 22 become integral. As a result, the clutch transmission member 22 rotates together with the first pulley 8. That is, since the first weight portion 56 of the clutch weight 54 of the second clutch 50 is in pressure contact with the contact/separation portion 42 of the clutch transmission member 22, the clutch transmission member 22 rotates together with the first pulley 8. At this time, the second pulley 10 is rotating at its own speed under the action of the third clutch 66.

Since the contact surface 36 of the driven plate 34 is in close contact with the attraction surface 32 of the electromagnetic transparent portion 24b of the base 24, the rotation shaft 6 rotates together with the clutch transmission member 22 via the first clutch 28 and the hub 12.
Therefore, the engine speed of compressor 2 is set to the set value.
First pulley 8 whose rotational speed is large when Ne is less than ₁
As shown in FIG. 5, the rotation speed of the compressor is increased compared to the compressor rotation speed (shown by the solid line), thereby increasing the cooling capacity.

On the other hand, when the engine speed reaches the set value Ne ₁ or higher, that is, the compressor speed reaches Nc ₁ (see Fig. 5), the clutch weight 5 of the second clutch 50 is increased.
4 rotates around the anchor 60. That is, the clutch weight 54 rotates against the biasing force of the clutch spring 62, and thus the first weight portion 56
rotates toward the center. As a result, a gap is formed between the clutch facing 52 and the contact/separation portion 42 of the clutch transmission member 22. Therefore, the rotation of the first pulley 8 is not transmitted to the clutch transmission member 22. Furthermore, the rotational movement of the first weight section 56 is regulated by the first weight section 56 coming into contact with the stopper 64 .

As described above, the connection between the first pulley 8 and the clutch transmission member 22 is released when the second clutch 50 is engaged or disengaged. The clutch transmission member 22 is connected to the second pulley 10 and the third clutch 6.
6. That is, the clutch transmission member 22 rotates at approximately half the speed as compared to when the first pulley 8 is connected. Therefore, the rotating shaft 6 rotates at approximately half the speed of the first pulley 8 as the clutch transmission member 22 rotates. As a result, as shown in FIG. 5, the compressor rotation speed (indicated by a solid line) is lowered compared to the conventional single-speed compressor rotation speed (indicated by a broken line). Therefore, when the engine speed exceeds the set value Ne ₁ , the compressor 2
This reduces noise, prevents overcooling, and improves fuel efficiency.

Further, according to the configuration of this embodiment, the outer portion 24c of the base 24 of the clutch transmission member 22 has a second
third bearing 48, 68, third clutch 66, first
Since the second pulleys 8 and 10 can be assembled in advance, assembly is facilitated at the time of assembly.

Furthermore, the shape of the clutch transmission member 22 can be simplified, making it easier to manufacture. Furthermore, by simplifying the shape of the clutch transmission member 22,
It becomes possible to improve the rigidity of the clutch transmission member 22 as a whole and extend its service life.

Furthermore, only one electromagnetic friction clutch, which is the first clutch 28, is used, which reduces the number of parts, simplifies the configuration, facilitates maintenance and inspection, and reduces costs.

Furthermore, since the first and second pulleys 8 and 10 are surrounded by the inclined stepped portion 44, the connecting portion 40, and the contact/separation portion 42 of the clutch transmission member 22, the first and second pulleys
Members such as covers that protect the pulleys 8 and 10 are not required, and the number of parts can be reduced.

Further, since the belt wound around the first pulley 8 is disposed between the side wall 10b of the second pulley 10 and the clutch weight 54 of the second clutch 50, it is possible to effectively prevent the belt from coming off.

Also, the driven plate 3 of the first clutch 28
4 is disposed in the end space S formed outwardly by the electromagnetic transparent portion 24b and the inclined step portion 44 of the base portion 24. Therefore, it is possible to protect the driven plate 34 and make it more compact.

[Effect of the invention] As is clear from the above detailed explanation, according to this invention, the hub fixing part of the hub is fixed to the protruding end of the rotating shaft of the main body of the compressor, and the part closer to the main body than the end face of the hub fixing part is A sealing member is fitted onto the rotating shaft of the rotary shaft, and the sealing member is provided with a holding member spaced apart from the hub fixing portion and oriented in the axial direction of the rotating shaft, and the holding member is provided with a clutch transmission member via the first bearing. , the clutch transmission member is connected to a base, an inclined step part connected to the base part and oriented outward to be separated from the main body, and a connecting part connected to the inclined step part and oriented in the radial direction of the rotating shaft. The base includes an inner part that contacts the first bearing and is oriented in the axial direction of the rotating shaft, and a base that has a diameter of the rotating shaft. A coil accommodating part that opens toward the main body is formed by an electromagnetic transparent part that is oriented in the direction and has an attraction surface on the outside, and an outer part that is spaced from the inner part and oriented in the axial direction of the rotating shaft. The electromagnetic coil of the first clutch is housed in the second clutch housing part, and the second clutch housing part is formed by the inclined step part, the connecting part, and the contact/separation part, and the second clutch housing part is provided with the second clutch housing part. A clutch weight is housed and provided, the inside of a folder plate is fixed to the hub ring part of the hub, the driven plate of the first clutch is fixed to the outside of the folder plate, and the driven plate is inclined with the electromagnetic transparent part. The driven plate has a contact surface that comes into contact with and separates from the adsorption surface, and is connected to the outer part of the base via a second bearing. A first supporting part of the first pulley is provided which is formed to have a smaller diameter than the separating part, and a connecting part of the first pulley is fixed to the clutch weight. By installing three clutches and a third bearing in parallel, providing a second support portion of the second pulley on the third clutch and third bearing, and forming the second pulley to have a larger diameter than the first pulley. By controlling the compressor to automatically switch to 2nd speed according to the engine speed, cooling capacity is increased when the engine speed is below the set value, and noise is reduced when the engine speed is above the set value. Moreover, overcooling can be prevented and fuel efficiency can be improved.

In addition, since the first and second pulleys are attached to the outside of the base of the clutch transmission member, during assembly,
The first and second pulleys can be assembled to the clutch transmission member in advance, making assembly easy.

Furthermore, since the first and second pulleys are surrounded by the inclined stepped part, the connecting part, and the contact/separation part of the clutch transmission member, there is no need for a cover or other member to protect the first and second pulleys. The number of points can be reduced and the configuration can be simplified.

Furthermore, since the belt wound around the first pulley is disposed between the second pulley and the clutch weight of the second clutch, it is possible to effectively prevent the belt from coming off.

Furthermore, since the driven plate of the first clutch is disposed in the end space formed by the electromagnetic transparent part and the inclined stepped part of the base of the clutch transmission member, the driven plate protrudes in the axial direction of the rotating shaft. Therefore, it is possible to protect the driven plate and make it more compact.

[Brief explanation of drawings]

1 to 5 show an embodiment of this invention, FIG. 1 is a sectional view of the compressor drive device, FIG. 2 is a half sectional view of the compressor drive device, FIG. 3 is a sectional view of the clutch transmission member, and FIG. FIG. 4 is a schematic diagram of the second clutch, and FIG. 5 is a diagram showing the relationship between engine speed and compressor speed. 6 and 7 show a conventional compressor drive device, FIG. 6 is a sectional view of the compressor drive device, and FIG. 7 is a sectional view of a clutch transmission member. In the figure, 2 is a compressor, 4 is a main body, and 6 is a compressor.
is the rotating shaft, 8 is the first pulley, 10 is the second pulley,
22 is a clutch transmission member, 24 is a base, 28 is a first clutch, 40 is a connecting portion, 42 is a connecting/separating portion, 44
50 is a second clutch, 52 is a clutch facing, 54 is a clutch weight, and 66 is a third clutch.

Claims (1)

[Scope of utility model registration request] In a compressor drive device that automatically switches and drives the compressor to a second speed by switching and rotating a first pulley and a second pulley of different diameters provided on a rotating shaft of a main body of the compressor, the rotating shaft protrudes. A hub fixing part of the hub is fixedly attached to the end, and a sealing material is fitted and provided on the rotating shaft that is closer to the main body than the end face of the hub fixing part, and the sealing material is provided with a sealing material spaced apart from the hub fixing part. a holding member oriented in the axial direction of the rotating shaft; a clutch transmission member is provided on the holding member via a first bearing; the clutch transmission member is connected to a base and is spaced apart from the main body; a sloping step section that is preferably oriented outwardly, a connecting section that is connected to the slant step section and that is oriented in the radial direction of the rotating shaft, and a connecting section that is connected to the connecting section that is oriented in the axial direction of the rotating shaft and the main body. The base includes an inner part that contacts the first bearing and is oriented in the axial direction of the rotating shaft, and an outer adsorption surface that is oriented in the radial direction of the rotating shaft. A coil accommodating part that opens toward the main body is formed by an electromagnetic transparent part and an outer part that is spaced from the inner part and oriented in the axial direction of the rotating shaft, and the electromagnetic part of the first clutch is formed in the coil accommodating part. A second clutch accommodating portion is formed to accommodate the coil, and the inclined step portion, the connecting portion, and the connecting/separating portion form a second clutch accommodating portion that opens toward the main body, and the second clutch accommodating portion is provided with a second clutch accommodating portion. A weight is housed therein, the inside of a folder plate is fixed to the hub ring portion of the hub, and the outside of the folder plate is provided with the first
A driven plate of the clutch is fixed, and this driven plate is disposed in an end space formed outwardly by the electromagnetic transparent part and the inclined step part, and the driven plate has a part in contact with the suction surface. A first support part for the first pulley is provided on the outer side of the base via a second bearing and has a smaller diameter than the contact/separation part. a connecting portion is fixedly provided to the clutch weight;
A third clutch and a third bearing are fitted in parallel on the outer side of the base closer to the main body than the first pulley, and a second support for the second pulley is fitted to the third clutch and third bearing. A drive device for a compressor, characterized in that the second pulley is formed to have a larger diameter than the first pulley.