JP2002195297A - Electromagnetic clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce abnormal sound without covering the whole clutch. SOLUTION: A damping steel plate 143 is fixed to an armature 140. Hence, the vibration of the armature 140 is absorbed (to be damped), thereby reducing the abnormal sound accompanied by the vibration of the armature 140, dispensing with covering the electromagnetic clutch 100.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic clutch for intermittently transmitting the driving force of a driving source to a driven device, and to an engine room such as a hydraulic pump or a compressor capable of intermittently driving a driving engine. It is effective when applied to an electromagnetic clutch that transmits power to rotating equipment inside.

[0002]

2. Description of the Related Art A clutch plate (an armature in an electromagnetic clutch) is not limited to an electromagnetic clutch, but a clutch that transmits power by frictional force due to an intermittent slip generated on a friction surface. Is excited and abnormal noise is generated.

[0003] Further, in the electromagnetic clutch, abnormal noise due to a collision sound generated when the armature is attracted is easily generated. Therefore, when a device such as an engine that emits a relatively loud noise is stopped, the electromagnetic clutch is stopped. Are connected (turned on), the abnormal noise due to the collision becomes particularly remarkable (irritating).

In order to deal with such abnormal noise, it is conceivable to cover the entire clutch with a cover having a relatively large mass. However, in this means, heat is trapped in the cover, and the heat dissipation of the electromagnetic clutch is reduced. Therefore, the life of the electromagnetic clutch may be shortened.

[0005] In view of the above, it is an object of the present invention to reduce abnormal noise without covering the entire clutch with a cover.

[0006]

According to the present invention, in order to achieve the above object, a driving source (E) is provided.
/ G) is an electromagnetic clutch that transmits the driving force to the driven device (200) that can be intermittently driven, the driving side rotating member (110) being rotationally driven by the driving source (E / G), and the driven device (200). Driven side rotating member (1
20), an exciting coil (130) that generates a magnetic field when energized, and a member (11) on one of the driving side rotating member (110) and the driven side rotating member (120).
0), is attracted to the other member (120) by the electromagnetic force of the magnetic field induced by the exciting coil (130), and applies a driving force from the driving side rotating member (110) to the driven side rotating member (120). An armature (140) having a friction surface (140c) for transmitting, and a vibration damping means (143) fixed to the armature (140) and absorbing vibration of the armature (140) are provided.

As a result, the vibration of the armature (140) can be absorbed (attenuated), and the noise caused by the vibration of the armature (140) can be reduced without covering the electromagnetic clutch with a cover.

The vibration damping means (143) has a sandwich structure in which a resin layer (143b) made of a viscoelastic resin is sandwiched between two steel plates (143a). It is desirable to use a vibration steel plate.

Further, as in the third aspect of the present invention, the vibration damping means (143) may be made of rubber.

[0010] Incidentally, the reference numerals in parentheses of the respective means are examples showing the correspondence with specific means described in the embodiments described later.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present embodiment is applied to a drive system of a compressor for a hybrid vehicle that runs by combining an engine (internal combustion engine) and an electric motor,
FIG. 1 is a schematic diagram showing a driving method of a compressor for an air conditioner (hereinafter, abbreviated as a compressor) according to the present embodiment.

In FIG. 1, reference numeral 100 denotes a clutch and a V-belt for transmitting a driving force of a driving engine (drive source (E / G)) E / G to a compressor (driven device, rotating device) 200 so as to be able to intermittently drive the engine. The electromagnetic clutch 100 is directly connected to a crankshaft (not shown) of the engine E / G.

The air conditioner is operated (A /
In the case where the C switch is ON, the electromagnetic clutch 100 is connected (while ON) to drive the engine E / G to the compressor 200 while the engine E / G is operating.
The electromagnetic clutch 100 is disengaged (turned off) while the engine E / G is stopped, and the compressor 200 is driven by another electric motor different from the electric motor for traveling.

Reference numeral 210 denotes a radiator (condenser) that exchanges heat between the refrigerant discharged from the compressor 200 and the outside air to cool the refrigerant, and 220 denotes a decompressor that decompresses the refrigerant flowing out of the radiator 210. Reference numeral 230 denotes an evaporator that exchanges heat between the refrigerant depressurized by the decompressor 220 and the air blown into the room to evaporate the refrigerant, thereby cooling the air blown into the room.

In this embodiment, a temperature-type expansion valve for mechanically adjusting the valve opening such that the degree of heating of the refrigerant at the outlet side of the evaporator 230 becomes a predetermined value is employed as the decompressor 220.

Next, the electromagnetic clutch 10 according to the present embodiment will be described.
The structure of 0 will be described.

FIG. 2 shows an electromagnetic clutch 10 according to this embodiment.
0 is an axial cross-sectional view of FIG.
/ G is a metal center hub (drive-side rotating member) that is connected to the / G crankshaft and rotates integrally with the crankshaft. The center hub (hereinafter, abbreviated as hub) 110 is a key (JIS B 1301). ), And is fixed to the crankshaft by bolts 111 in a state where it is prevented from rotating with respect to the crankshaft.

Reference numeral 120 denotes a rotor (driven side rotating member) that rotates integrally with a substantially cylindrical pulley (cylindrical member) 121 on which a V-belt is hung. The rotor 120 and the pulley 121 are elastically deformable. They are connected via a first damper member 122 made of a material (in this embodiment, EPDM (ethylene / propylene / diene terpolymer rubber)).

Incidentally, the first damper member 122 is made of metal (in this embodiment, press-fitted and fixed to the inner cylindrical wall of the pulley 121 made of metal (FC material in this embodiment) and the outer cylindrical wall of the rotor 120. , SGP material) and vulcanized to the outer wall of the cylindrical member 123, and the first damper member 12
2 and the rotor 120 and the pulley 121
And the torque (driving force) is transmitted.

The rotor 120 has a double cylindrical structure including an outer cylindrical portion 124, an inner cylindrical portion 125, and a ring plate portion 126 connecting the outer cylindrical portion 124 and the inner cylindrical portion 125 at one end in the axial direction. The outer cylinder part 124, the inner cylinder part 125, and the ring plate part (friction plate) 126 are made of a ferromagnetic material such as an iron-based material having a low carbon content (in this embodiment, S10).
C), a part of a magnetic path (yoke) of a magnetic flux induced by the excitation coil 130 described later is formed.

The rotor 120 is provided with a bearing (in the present embodiment, the bearing is disposed between the outer cylinder portion 124 and the hub 110).
The two rolling bearings 127 support the hub 110 so as to be rotatable with respect to the hub 110. Incidentally, the bearing 127 has its inner race fixed to the outer peripheral wall of the hub 110 by press-fitting, and its outer race fixed to the rotor 120.
(The outer cylinder part 124) is press-fitted and fixed to the inner cylinder wall, and the stepped part 1 formed on the retaining ring 128 and the hub 110.
12 and positioned in the axial direction.

A ring-shaped exciting coil (stator coil) 130 for generating a magnetic field when energized is inserted into a space between the outer tube portion 124 and the inner tube portion 125. The coil 130 is made of a ferromagnetic material such as an iron-based material having a low carbon content (in this embodiment, S10
It is held by a stator housing (holding member) 131 also serving as a yoke formed in C). The excitation coil 130 is molded and fixed to a resin (in the present embodiment, an epoxy resin) while being mounted in the double ring portion 131a of the stator housing 131.

Here, the stator housing 131 is supported by the hub 110 so as to be rotatable with respect to the hub 110 by a bearing (in this embodiment, a rolling bearing) 132 which is press-fitted and fixed to the outer peripheral wall of the hub 110. ing. At this time, both the rotor 120 and the stator housing 131 (excitation coil 130) are positioned with reference to the hub 110, so that the stator housing 131 (excitation coil 130) is accurately positioned with respect to the rotor 120.

Incidentally, the bearing 132 has a cylindrical collar 13 disposed so as to be in contact with the axial end of the bearing 127.
3 and the retaining ring 133a are positioned in the axial direction.

Numeral 134 denotes a stator housing 131
And a stator plate that supports the stator housing 131 together with the bearing 127 while preventing the stator housing 131 (excitation coil 130) from rotating together with the hub 110.

As shown in FIG. 3, the stator plate 134 is provided with an arm portion 134a projecting radially outward from the pulley 121. As shown in FIG. An elastic member (in this embodiment, EP
It is fixed to the engine E / G (such as a crank casing) via a bushing (anti-vibration rubber) 135 made of DM (ethylene / propylene / diene terpolymer rubber).

Reference numeral 140 denotes a link plate formed of a ferromagnetic material (in this embodiment, S10C) such as an iron-based material having a low carbon content adsorbed on the ring plate portion (friction plate) 126 of the rotor 120. The armature 140 is connected to the armature 140 and a ring plate (friction plate) by a magnetic field induced by the exciting coil 130.
126 is attracted by the electromagnetic attraction generated between them.

The armature 140 and the ring plate 1
26 has a magnetic flux interrupting portion 140 so that magnetic flux passes between the armature 140 and the ring plate portion 126 in a meandering manner.
a, 126a are provided in a staggered manner,
40a and 126a are configured by means such as providing a gap in the middle of the magnetic path or burying a non-magnetic material.

Reference numeral 141 denotes a substantially triangular plate-shaped leaf spring (spring means) for applying an elastic force for separating the armature 140 from the ring plate portion 126.
As shown in FIG. 3, it is partially connected to the armature 140 by a rivet (fastening means) 141b disposed at the apex thereof, and is connected and fixed in a state where the central portion is prevented from rotating with respect to the hub 110. ing.

In this embodiment, the leaf spring 141 is connected to the hub 1 by a set bolt (hereinafter abbreviated as a bolt) 111.
10 is prevented from falling off. By the way, 141
c is a hole for reducing the elastic coefficient of the leaf spring 141.

A portion 141a of the leaf spring 141 which opposes the armature 140 and an armature 140
As shown in FIG. 4, an elastic material (EPDM in the present embodiment) that absorbs shock is provided on at least one side (the surface of the leaf spring 141 in the present embodiment) of the portion 140b that opposes the leaf spring 141. The second damper member 142 is coated (coated) by flow joining.

The leaf spring 14 of the armature 140
3, a damping steel plate (damping means) 143 for absorbing the vibration of the armature 140
Are bonded with an adhesive.

Here, as shown in FIG. 5, the damping steel sheet 143 is a resin layer 1 made of a viscoelastic resin (viscoelastic rubber) having a high viscosity (high viscosity damping) between two steel sheets 143a.
It has a sandwich structure sandwiching 43b, and absorbs vibration of the armature 140 by a vibration system composed of the mass of the steel plate 143a and the spring characteristics and viscous damping force of the resin layer 143b.

Although FIG. 3 shows that there are three damping steel plates 143, actually, as shown in FIG.
Ring part 143c that fits on the outer peripheral wall of armature 140
Are integrated.

The armature 14 of the pulley 121
By extending the axial end 121a on the 0 side from the friction surface 140c to the leaf spring 141 side, the armature 14
0 is covered with a pulley 121, and a wall surface 151 which is formed in a ring shape surrounding the armature 140 and is substantially parallel to the axial direction is formed at the axial end portion 121 a. Thus, the circumferential groove 150 having a substantially concave cross-sectional shape that is depressed in the axial direction is formed. Here, the friction surface 140c refers to a portion (surface) of the armature 140 that faces the ring plate portion (friction plate) 126.

The inner peripheral side wall surface 14 of the armature 140
0c is opposite to the friction surface 140c (left side in FIG. 2).
The tapered portion 140d is provided such that the diameter of the inner peripheral side wall surface 140c increases as going toward.

Next, the electromagnetic clutch 10 according to this embodiment will be described.
The general operation of 0 will be described.

The energization of the excitation coil 130 is stopped (OF
F), the leaf spring 141 is in a natural state (in this embodiment, a flat state that is not curved as shown in FIG. 2), and the distance between the armature 140 and the ring plate (friction plate) 126 is increased. (In this embodiment, about 0.5 mm), the gap δ is secured, and the transmission of the driving force from the hub 110 to the rotor 120 is cut off.

On the other hand, when the excitation coil 130 is energized (ON), the armature 140 and the ring plate (friction plate) 1 are caused by the magnetic field induced by the excitation coil 130.
26, an electromagnetic attraction force is generated, the leaf spring 141 is bent, and the armature 140 is rotated by the rotor 120 (the ring plate portion 12).
6), the driving force is transmitted from the hub 110 to the rotor 120.

The armature 140 is connected to the rotor 120
While being adsorbed to the (ring plate portion 126), a gap is generated between the armature 140 and the leaf spring 141,
On the other hand, while the armature 140 is separated from the rotor 120, the armature 140, the leaf spring 141 and the rivet 14
1b.

Next, the electromagnetic clutch 10 according to this embodiment will be described.
The assembly procedure of No. 0 will be outlined in the order of the steps.

First, after the bearing 127 is press-fitted and fixed to the hub 110, the rotor 120 is press-fitted and fixed to the bearing 127, and the retaining ring 128 is attached to the rotor 120. Next, color 13
3 is mounted on the hub 110, and the bearing 132 is press-fitted and fixed to the hub 110, so that the stator housing 131 in which the bearing 132 is press-fitted and fixed is assembled to the hub 110,
The retaining ring 133a is mounted on the hub 110. Then, the bolt 111 is attached, and the leaf spring 141 and the armature 140 are attached.
Is fixed to the hub 110.

Next, the features (effects) of this embodiment will be described.

According to this embodiment, since the damping steel plate 143 is fixed to the armature 140, the armature 14
0 vibration can be absorbed (attenuated),
The noise caused by the vibration of the armature 140 can be reduced without covering the electromagnetic clutch 100 with a cover.

The armature 14 of the leaf spring 141
0, the second damper member 14
Since 2 is coated (coated), it is possible to prevent the armature 140 from directly colliding with the leaf spring 141 when the electromagnetic clutch 100 is disengaged (when the electromagnetic clutch 100 is turned off). Therefore, it is possible to suppress the generation of the interference sound (chatter sound) when the electromagnetic clutch 100 is disengaged.

As described above, when the electromagnetic clutch 100 is disengaged, the second damper 142
Since interference noise generated when the 0 and the leaf spring 141 collide is reduced, if the thickness of the second damper member 142 is set to approximately 50 μm or more, a sufficient effect can be obtained in practical use.

Further, a circumferential groove 150 having a substantially concave cross-sectional shape depressed in the axial direction is formed so as to form a ring shape surrounding the armature 140 and to form a wall surface 151 substantially parallel to the axial direction. Is formed, the electromagnetic clutch 100 can be used when checking the engine or adding engine oil.
Oil drops on the friction surface 1
Circumferential groove 150 (wall 15
It flows downward along 1) and falls from the electromagnetic clutch 100.

The oil adhering to the head of the bolt 111 tends to flow toward the friction surface 140c through the inner peripheral side wall surface 140c of the armature 140.
In addition to the electromagnetic clutch 100 being mounted on the engine E / G (crankshaft) so that the axial direction of 00 (armature 140) is substantially horizontal, the inner peripheral side wall surface 140c is opposite to the friction surface 140c. As you go to the side,
The tapered portion 1 such that the diameter of the inner peripheral side wall surface 140c increases.
Since 40d is provided, the oil that has reached the inner peripheral side wall surface 140c does not flow to the friction surface 140c side,
It flows on the opposite side to the friction surface 140c and drops from the electromagnetic clutch 100.

Therefore, even if oil drops on the electromagnetic clutch 100 at the time of checking the engine or adding engine oil, it is possible to prevent the dropped oil from adhering to the friction surface 140c.

The stator plate 134 is connected to the engine E / G via a bushing 135 made of an elastic member.
Since it is fixed to the engine (e.g., engine crank casing), the relative vibration displacement of the stator housing 131 (excitation coil 130) with respect to the rotor 120 can be absorbed by the vibration of the engine E / G.

Therefore, the clearance between stator housing 131 and rotor 120 can be maintained at an appropriate value, so that an increase in magnetic resistance between stator housing 131 and rotor 120 can be prevented, and armature 140 and rotor 120 can be prevented from increasing. Can be prevented from being reduced.

Since the collar 133 is provided between the bearing 132 and the bearing 127, the relative position between the bearing 132 and the bearing 127 is maintained while the relative position between the bearing 132 and the bearing 127 is easily determined (the bearing 132). Can be prevented from moving with respect to the bearing 127).

(Other Embodiments) In the above-described embodiment, the second damper member 142 is covered by the leaf spring 141. However, the present invention is not limited to this. Site 14 against
0b.

In the above-described embodiment, the second damper member 142 is fixed to the leaf spring 141 by vulcanization. However, the present invention is not limited to this. Alternatively, mechanical means such as rivets or the like may be used.

In the above embodiment, the damping steel plate 14 is used.
Although the vibration damping means for absorbing the vibration of the armature 140 is constituted by 3, the present invention is not limited to this.
For example, the vibration damping means may be made of rubber (for example, EPDM). In this case, in order to obtain a sufficient vibration damping effect, the thickness of the rubber is desirably 2 mm or more.

In the above embodiment, the damping steel plate 14
3 is bonded, but the present invention is not limited to this.
3 may be fixed to the armature 140.

In the above embodiment, the friction surface 140
c to prevent oil from adhering to the circumferential groove 1
Although both 50 (wall surface 151) and the tapered portion 140d are provided, only one of them may be provided.

In the above-described embodiment, the bearing 132 is provided between the stator housing 131 and the hub 110. However, the present invention is not limited to this. Good. In this case, the bushing 135 has at least two arm portions 134a.
It is necessary to fix the stator housing 131 to a fixing member such as the engine E / G via the above.

In the above embodiment, the bearing 132
Has been positioned in the axial direction by being sandwiched between the collar 133 and the retaining ring 133a disposed so as to contact the axial end of the bearing 127, but the present invention is not limited to this. For example, a stepped portion is formed such that the diameter of the portion of the hub 110 into which the bearing 132 is press-fitted is smaller than the diameter of the portion of the hub 110 into which the bearing 127 is press-fitted. May be positioned to position the bearing 132.

In the above-described embodiment, the present invention is applied to the electromagnetic clutch mounted on the crankshaft of the engine and transmitting the driving force to the compressor 200. However, the present invention is not limited to this. It can be applied to other uses.

In the above-described embodiment, the driving force is input from the hub 110 side, and the pulley 121 (rotor 120)
Although the driving force is output to the side, the present invention is not limited to this, and the driving force may be input from the pulley 121 (rotor 120) side and output to the hub 110 side. .

In the above-described embodiment, the hub 110 serving as the driving-side rotating member and the rotor 12 serving as the driven-side rotating member are used.
0 is coaxially parallel with bearing 127 (double cylindrical)
However, both 110 and 120 may be coaxially arranged in series.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a power transmission system using an electromagnetic clutch according to an embodiment of the present invention.

FIG. 2 is a sectional view of an electromagnetic clutch according to the embodiment of the present invention.

FIG. 3 is a left side view of FIG. 2;

FIG. 4 is an enlarged view of a portion A in FIG. 2;

FIG. 5 is a cross-sectional view of a damping steel plate employed in the electromagnetic clutch according to the embodiment of the present invention.

[Explanation of symbols]

110: center hub (drive side rotating body), 120: rotor (driven side rotating body), 121: pulley, 122: second damper member, 130: exciting coil, 131: stator housing (holding member), 140: armature, 140d
... taper portion, 135 ... bushing, 141 ... leaf spring (spring means), 142 ... second damper member, 143 ... damping steel plate (damping means), 150 ... circumferential groove.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Junichi Nakagawa 1-1-1, Showa-cho, Kariya-shi, Aichi Pref. Inside DENSO (72) Inventor Katsuya Dotsutsu 1-1-1 Showa-cho, Kariya-shi, Aichi Pref. DENSO Corporation

Claims (3)

[Claims] 1. An electromagnetic clutch for transmitting a driving force of a drive source (E / G) to a driven device (200) that can be intermittently driven, wherein a drive-side rotary member is rotationally driven by the drive source (E / G). (110), a driven-side rotating member (120) that is connected to the driven device (200) and rotates, and an excitation coil (13) that generates a magnetic field when energized.
0) and an electromagnetic force caused by a magnetic field induced by the exciting coil (130), which is connected to the member (110) on one of the driving side rotating member (110) and the driven side rotating member (120). An armature (140) having a friction surface (140c) attracted to the other member (120) and transmitting a driving force from the driving-side rotating member (110) to the driven-side rotating member (120); 140), and a vibration damping means (143) for absorbing vibration of the armature (140). 2. The vibration damping means (143) includes a resin layer (143) made of a viscoelastic resin between two steel plates (143a).
The electromagnetic clutch according to claim 1, wherein the electromagnetic clutch is a damping steel plate having a sandwich structure sandwiching b). 3. The electromagnetic clutch according to claim 1, wherein said damping means is made of rubber.