JPH07293594A - Clutch device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a clutch device at low cost by improving the cost. [Structure] In the clutch device, the front side of a first field core 10 and a second field core 11 are inserted into inner and outer annular grooves 3a and 3b of a rotor 3 that rotates integrally with a pulley 40. The first armature 18 facing the first field core 10 via the rotor 3 is supported by a leaf spring 20 on a first hub 21 key-fitted to the rotating shaft 1. In addition, the second armature 19 facing the second field core 11 with the rotor 3 in between is provided with a bearing 23 on the rotating shaft 1.
It is supported by the leaf spring 25 on the second hub 24 supported via the. The rotary shaft 1 and the second hub 24 are connected by an eddy current coupling 29.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch device used in a cooling fan driving device for automobiles, and more particularly, to a mechanism combining two friction type electromagnetic clutches and one eddy current coupling. The present invention relates to improvement of a clutch device.

[0002]

2. Description of the Related Art A clutch device used as a cooling fan driving device for an automobile is disclosed in, for example, US Pat.
As described in No. 92 specification, it is composed of a mechanism that combines two friction type electromagnetic clutches and one eddy current coupling, and the rotation speed of the impeller fan with respect to the rotation speed of the engine is It is possible to select the rotation speed in the low speed range or high speed range. That is, by magnetically adsorbing the armature of the friction type electromagnetic clutch configured on the inside to the rotor, the fan of the impeller is driven from the intermediate ring of the double structure bearing via the eddy current coupling and the impeller hub, or to the outside. The fan of the impeller is driven via the impeller hub by magnetically adsorbing the armature of the constructed frictional electromagnetic clutch to the rotor.

[0003]

In such a clutch device, the impeller fan is supported by the rotating shaft by means of a bearing having a double structure, and the axial dimension of the clutch device can be shortened. However, the cost for manufacturing the double-structured bearing is high, and the clutch device cannot be provided at low cost. In addition, since the bearing has a double-row angular contact ball bearing structure, the span between the balls is short, and the impeller hub easily swings. It is an object of the present invention to provide such a clutch device at a low cost by suppressing such vibration of the constituent members and improving the cost reduction.

[0004]

In order to achieve such an object, in the present invention, a transmission member such as a pulley is attached to the rotor.

[0005]

The clutch device magnetically attracts the inner armature of the friction type electromagnetic clutch to the rotor that rotates together with the transmission member, so that the impeller fan or the like is mounted through the rotating shaft and the eddy current coupling. Hub
The rotation in the low speed range is transmitted. Further, by magnetically attracting the armature of the outer friction type electromagnetic clutch to the rotor, the rotation in the high speed range is transmitted to the hub.

[0006]

1 is a sectional view of a clutch device according to a first embodiment of the present invention, and FIG. 2 is a sectional view of the friction type electromagnetic clutch of FIG. The clutch device in these drawings is illustrated as a cooling fan drive device for an automobile. Less than,
Embodiments will be described in detail with reference to the drawings. The rotary shaft 1 having an annular protruding portion 1a formed at a substantially central portion in the axial direction has two
The rotor 3 is rotatably supported via a first bearing 2a composed of a single radial bearing and a third bearing 2b composed of a similar radial bearing. The rotor 3 has an inner annular groove 3a and an outer annular groove 3b formed therein, and an inner cylindrical portion 4 in which the outer rings of the first bearing 2a and the third bearing 2b are press-fitted into the inner peripheral surface, and the inner cylindrical portion 4 A disk portion 5 that extends radially outward from one end of the cylindrical portion 4, an outer cylindrical portion 6 that extends axially from the radially outer end of the disk portion 5, and an inner cylindrical portion 4
The disk portion 5 at a substantially intermediate position in the radial direction between the outer cylindrical portion 6 and the outer cylindrical portion 6.
And an intermediate cylindrical portion 7 extending in the axial direction. Also,
Inner disk portion 5a between the inner cylindrical portion 4 and the intermediate cylindrical portion 7
In the outer disc portion 5b between the intermediate disc portion 7 and the outer cylindrical portion 6, a plurality of arc-shaped slits 8 are formed on the same circumference at intervals and serve as demagnetization portions. , And each is double formed.

Further, in the annular grooves 3a and 3b of the rotor 3, a part of the first field core 10 and the second field core 11 of the exciter 9 on the front side is fitted. Annular groove 10a / 11 formed in each field core 10/11
The electromagnetic coils 12 and 13 are housed in a and are insulated with an insulating resin. Then, the cylindrical portion 14b of the mounting member 14 having the disk portion 14a fixed to the back surface of the exciter 9.
Is fitted to the inner cylindrical portion 4 of the rotor 3 via a pair of radial bearings 15 and 16, so that the exciter 9 is supported by the rotor 3. The mounting member 14 includes a plurality of mounting bolts 17 (in the figure, a plurality of mounting bolts 17 formed in the circumferential direction).
Only one is shown. ) Is fixed to a fixed housing or the like (not shown).

The inner disk portion 5a and the outer disk portion 5 of the rotor 3
A first armature 18 and a second armature 19 are formed on each front surface of b with a predetermined air gap. The first armature 18 is supported by a leaf spring 20 on a first hub 21 key-fitted to the rotary shaft 1, and is movable only in the axial direction. Further, the first armature 18 is provided with a plurality of arc-shaped slits 18a as demagnetization portions at intervals on the same circumference, and by energizing the electromagnetic coil 12 of the first field core 10, The generated magnetic flux is the first armature 18
To form a double flux type magnetic circuit which is diverted to the rotor 3 and to the first armature 18. Reference numeral 22 is a stopper rubber attached to the flange portion of the first hub 21, and the height of the stopper rubber 22 sets the initial load of the leaf spring 20.

On the other hand, the second armature 19 has a rotary shaft 1
The second hub 2 rotatably supported by the second bearing 23 composed of two radial bearings (specifically, deep groove ball bearings).
4 is supported by a leaf spring 25 so as to be movable only in the axial direction. Further, the collar 26 fixed to the second hub 24 together with the base end portion of the leaf spring 25 has a leaf spring 25.
A stopper rubber 27 having a height set with the initial load of is attached. The second armature 19 also has a plurality of arc-shaped slits 19a as demagnetization portions formed on the same circumference at intervals so as to form a double-flux type magnetic circuit. ing. A cooling fan 28 is attached to the outside of the flange portion of the second hub 24.

Further, the first yoke 30 of the eddy current coupling 29 composed of the first yoke 30 and the second yoke 31 is fixed to the end surface of the boss portion of the second hub 24. The first yoke 30 is a disk-shaped disc 32 made of a non-magnetic member.
In addition, an even number of through holes 32a are formed on the same circumference at intervals, and the second hub 24 side of these through holes 32a is closed by a magnetic plate 33. In addition, each through hole 32a
Inside, permanent magnets 34 are fitted and fixed so that their polarities alternate in the circumferential direction.

The second yoke 31 is a cooling fan 35 made of a non-magnetic member, and the third hub 3 fixed to the cooling fan 35 and key-fitted to the tip of the rotary shaft 1.
6 and. In addition, the first yoke 30 of the cooling fan 35
The magnetic plate 37 and the conductor plate 38 are fixed to the side. A predetermined air gap is formed between the first yoke 30 and the second yoke 31.

Further, in the clutch device according to this embodiment, the inner cylindrical portion 4 of the rotor 3 protruding outward from the cylindrical portion 14b of the mounting member 14 on the rear end side of the rotary shaft 1.
The fourth hub 39 is key-fitted to the end of the
An input pulley 40 as a transmission member is fixed to the hub 39. Furthermore, the boss portion end surface of the first hub 21 and the first hub 21
The dust cover 41 configured to prevent abrasion powder and the like from entering the first bearing 2 side on the rotary shaft 1 between the inner ring end surface of the bearing 2 and the disc portion 5 of the rotor 3 and the first and second portions. A collar 42 as a position adjusting member configured to adjust the air gap between the two armatures 18 and 19 is fitted.

In the clutch device having the above-described structure, a belt (not shown) is wound around the pulley on the engine side and the input pulley 40, so that the input pulley 40 is constantly rotating when the engine is driven. . Then, the rotor 3 to which the input pulley 40 is attached is also constantly rotating. Therefore, when the electromagnetic coil 12 is energized and the first armature 18 is magnetically attracted to the rotor 3, the rotation of the rotor 3 is transmitted from the first hub 21 to the rotary shaft 1 and from the rotary shaft 1 to the eddy current coupling 29. Then, the fan 28 of the impeller mounted on the second hub 24 is driven by the rotation speed in the low speed range controlled by the magnetic force of the permanent magnet 34 of the eddy current coupling 29.

When the electromagnetic coil 12 is de-energized and the electromagnetic coil 13 is energized, the first armature 18 is released from the rotor 3 by the leaf spring 20, and the second armature 19 is magnetically attracted to the rotor 3. The rotation of the rotor 3 is transmitted to the second hub 24 as it is. Then, the impeller fan 28 is driven at a rotational speed in a high speed range.

Next, a clutch device according to a second embodiment of the present invention will be described with reference to the sectional view of FIG. It should be noted that the same components as those of the clutch device of the first embodiment are denoted by the same reference numerals as those already used, and detailed description thereof will be omitted. In the clutch device of the second embodiment, an input pulley 43 as a transmission member is fitted and fixed to the outer cylindrical portion 44 of the rotor 3. Then, the inner cylindrical portion 45 of the rotor 3
However, it has a structure that extends to the annular protrusion 46a of the rotary shaft 46. The rotor 3 is rotatably supported by the rotary shaft 46 by the first bearing 2 a, and the mounting member 14 fixed to the back surface of the exciter 9 is supported by the rotary shaft 46 by the pair of radial bearings 47 and 48. It has a structured structure. Other structures and operations are the same as those in the first embodiment.

In the clutch devices of the first and second embodiments having the above structure, the first armature 18 and the second armature 19 are formed by the leaf springs 20 and 25 by the first hub 21 and the second armature. Although it is supported by the hub 24, it may be supported by a rubber damper as described in, for example, US Pat. No. 5,184,705. Further, although the input pulley 40 and the input pulley 43 are illustrated as the transmission members, other pulleys or transmission members other than the pulleys may be configured. Furthermore, although two deep groove ball bearings are combined as the radial bearing 23, a plurality of other radial bearings may be combined.

[0017]

As described above, in the clutch device according to the present invention, the transmission member is attached to the rotor, and the first hub, on which the first armature is supported, is supported on the rotating shaft so as to be integrally rotatable. It is not necessary to construct a double-structured bearing like the above clutch device, and it is possible to suppress the run-out of the second hub that is supported by the rotating shaft so as to rotate freely, and to provide the clutch device at low cost. .

Further, since the transmission member is mounted on the rotor, when the transmission member is formed inside the fixed housing in which the clutch device is mounted, the transmission member should be the end portion of the inner cylindrical portion of the rotor. When the transmission member is mounted on the outer side of the fixed housing, the transmission member may be attached to the outer peripheral surface of the outer cylindrical portion of the rotor. Since the belt hanging position is different, there is no need to change the design of the mounting position of the clutch device.

[Brief description of drawings]

FIG. 1 is a sectional view of a clutch device according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the friction type electromagnetic clutch of FIG.

FIG. 3 is a sectional view of a clutch device according to a second embodiment of the present invention.

[Explanation of symbols]

 1 Rotating Shaft 3 Rotor 18 1st Armature 19 2nd Armature 21 1st Hub 24 2nd Hub 29 Eddy Current Coupling

Claims (3)

[Claims] 1. A rotary shaft, a rotor rotatably supported by the rotary shaft integrally formed with an inner annular groove and an outer annular groove, to which a transmission member is mounted, and an inner annular ring of the rotor. A first field core having a part of the front side fitted in the groove, a second field core having a part of the front side fitted in an annular groove outside the rotor, and the first field core A first armature facing each other through the inner disk portion of the rotor, a second armature facing the second field core and the outer disk portion of the rotor, and the first armature in the axial direction. And a second armature movably supported only in the axial direction, and a first hub rotatably supported integrally with the rotating shaft, and idle rotating through a bearing on the rotating shaft. Support It has been a second hub, a clutch device being characterized in that a eddy current coupling for connecting the rotary shaft and the second hub. 2. The rotor and the rotor, wherein the rotor is rotatably supported by a bearing on the rotor and an inner cylindrical portion extending outward from the back surface of the first and second field cores is formed. A mounting member that is supported by the inner cylindrical portion of the rotor via a bearing and is integrally fixed to the first and second field cores, and an end portion of the inner cylindrical portion of the rotor that projects outward from the mounting member. The clutch device according to claim 1, further comprising the transmission member mounted on the clutch device. 3. A mounting member which is integrally fixed to the back surfaces of the first and second field cores and is supported by the rotary shaft via a bearing, and is mounted on the outer peripheral surface of the outer cylindrical portion of the rotor. The clutch device according to claim 1, further comprising: the transmission member.