JPH10339335A - Electromagnetic clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic clutch having high reliability though reducing a cost further with weight lightened. SOLUTION: An electromagnetic clutch 1 comprises an armature plate 30 attracted to a rotor 20 at excitation time, cylinder part 12 fixed to a rotary shaft 2, a hub 10 having a flange part 11 provided in this cylinder part 12, a hub plate 40 fixed to the flange part 11 to be opposed in an axial direction to the armature plate 30, at least three rivets 15 provided along a peripheral direction in the armature plate 30, and a rubber damper 50 mounted in a peripheral surface of each rivet 15. Here, a bending part 70A formed by bending a peripheral edge of the hub plate 40 in an opposite direction to the armature plate 30 holds each rubber damper 50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic clutch, and more particularly to an electromagnetic clutch for transmitting a driving force from a driving source to a rotating shaft of a refrigerant compressor.

[0002]

2. Description of the Related Art A conventional electromagnetic clutch includes an armature plate which is attracted to a rotor when excited, a hub having a flange portion, a hub plate fixed to the flange portion of the hub and axially facing the armature plate. The armature plate includes three projections provided along the circumferential direction, and an elastic member attached to the outer peripheral surface of each projection.

[0003] The hub is composed of a cylindrical portion fixed to the rotating shaft and a flange portion provided integrally with one end of the cylindrical portion.

The elastic member is fixed to the hub plate by projection welding or the like, held in a container, or held in a recess formed in the hub plate.

[0005]

However, in the former case,
There is a problem that the welded portion of the welded container comes off due to vibration or the like, the damping effect of the elastic member is reduced, and the function as an electromagnetic clutch is reduced (reliability is reduced).

In the latter case, the joint between the hub plate and the flange portion of the hub is separated from the surface of the armature plate, so that the cylindrical portion of the hub becomes longer, thereby lowering the reliability and increasing the weight. As a result, there is a problem that the manufacturing cost increases.

Further, since a gap is formed between the armature plate and the hub plate, a cover is required to prevent foreign matter from entering.

[0008] The present invention has been made in view of such circumstances, and its object is to provide an inexpensive, highly reliable,
Another object of the present invention is to provide a lightweight electromagnetic clutch.

[0009]

According to a first aspect of the present invention, there is provided an electromagnetic clutch comprising: an armature plate which is attracted to a rotor when energized; a cylindrical portion fixed to a rotating shaft; A hub having a flange portion connected to the armature plate, a hub plate fixed to the flange portion and facing the armature plate in the axial direction, and a hub extending along the circumferential direction of the armature plate. In an electromagnetic clutch including at least three projections provided and an elastic member mounted on an outer peripheral surface of each of the projections, an outer peripheral edge of the hub plate is formed by bending an outer peripheral edge of the hub plate in a direction opposite to the armature plate. Each of the elastic members is held by a bent portion.

[0010] Since the elastic member is held by the bent portion formed by bending the outer peripheral edge in the opposite direction to the armature plate, a separate member for holding the elastic member can be eliminated, and the member is welded or the like. The work for attaching to the plate can be omitted.

Further, since the bent portion does not fall off the hub plate due to vibration or the like, the damping effect of the elastic member held by the bent portion does not decrease, and the electromagnetic clutch can obtain stable performance. .

Further, since only the outer peripheral edge of the hub plate is bent, the length of the cylindrical portion can be minimized to improve reliability, reduce weight, and prevent foreign matter from entering. Omission of the cover can be achieved.

According to a second aspect of the present invention, in the electromagnetic clutch according to the first aspect, the projecting portion supporting each of the elastic members from the center side of the hub plate is configured to connect the hub plate to the armature plate. It is characterized by being formed to project in the opposite direction.

The elastic member is held by a bent portion and a projected portion formed by bending and projecting the hub plate, and there is no possibility that the elastic member will fall off the hub plate due to vibration or the like.
The damping effect by the elastic member does not decrease,
The electromagnetic clutch has stable performance.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of an electromagnetic clutch according to one embodiment of the present invention.

The electromagnetic clutch 1 is rotatably supported through a hub 10 and a radial bearing 3 and rotates about an axis of rotation 2 of the refrigerant compressor by a rotational force from an engine (not shown). When the electromagnetic coil 21 is energized (excited), the armature plate 30 that is attracted to the rotor 20 and three rivets (projections) provided on the armature plate 30 along the circumferential direction are attached. Rubber damper (elastic member) 5 for returning the armature plate 30 to the home position when no power is supplied
0.

The hub 10 has a cylindrical portion 12 mounted on the rotating shaft 2 of the refrigerant compressor by bolts 5, and a cylindrical portion 12.
And a flange portion 11 provided integrally with one end of the second member.

A pulley 60 is integrally provided on the outer peripheral surface of the rotor 20, a V-belt (not shown) is wound around the pulley 60, and the rotor 20 is connected to a crankshaft of the engine via the V-belt. I have.

FIG. 2 is a view taken in the direction of the arrow a in FIG.

The armature plate 30 comprises an outer annular portion 31 and an inner annular portion 33 disposed inside the outer annular portion 31 via a connecting member 32. The outer annular portion 31 and the inner annular portion 33 are made of, for example, low carbon steel.

In the inner annular portion 33, insertion holes 33a are formed on the same circumference around the rotation shaft 2 at intervals of 120 °.

The rotating shaft 2 is mounted on the flange 11 of the hub 10.
The insertion holes 11a are formed at an interval of 120 ° on the same circumference centered at.

The hub plate 40 has a substantially triangular shape. In the hub plate 40, insertion holes 40a are formed at intervals of 120 ° on the same circumference centered on the rotating shaft 2, and bolts 5 screwed to the rotating shaft 2 are formed in the center of the hub plate 40. A hole 40c is formed for attaching the second member.

An insertion hole 40b is formed at each apex of the hub plate 40 on the same circumference around the rotation shaft 2.

The rivet 14 is inserted through the insertion hole 40a and the insertion hole 11a, and the lower surface of the hub plate 40 is fixed to the flange portion 11.

The rivet 15 set in the insertion hole 33a
Protrudes toward the hub plate 40 through the insertion hole 40b, and a rubber damper 50 described later is mounted on the rivet 15, and the hub plate 40 is connected to the rivet 15 and the rubber damper 5.
0 is connected to the upper surface of the inner annular portion 33.

FIG. 3 is an enlarged view of the apex portion of the hub plate.
FIG. 4 is a perspective view of the hub plate.

The outer peripheral edge of the hub plate 40 was bent over the entire circumference in the direction opposite to the armature plate 30 to form a bent portion 70A.

A predetermined portion of the hub plate 40 is projected in a direction opposite to the armature plate 30 so that the rubber damper 5
0 was formed from the center of the plate to form a projection 70B.

The rubber damper 50 has a bent portion 70A and a projected portion 7
OB is held in a compressed state from all sides.

A concave portion 50 a is formed in the rubber damper 50 and is fixed to the head of the rivet 15.

When forming the hub plate 40, the bent portion 70A and the protruding portion 70B are formed simultaneously by press working.

Next, the operation of the electromagnetic clutch will be described.

When the electromagnetic coil 21 is energized, an attractive force is generated between the armature plate 30 and the rotor 20, and the armature plate 30 is attracted to the rotor 20.
The rubber damper 50 is deformed (compressed), and the armature plate 30 moves to the rotor 20 side.

When the armature plate 30 is attracted to the rotor 20, the rotational force of the rotor 20 rotating by the rotational force from the engine (not shown) is transmitted to the armature plate 30.

The rotating force transmitted to the armature plate 30 is transmitted to the rotating shaft 2 via the rivet 15, the rubber damper 50, the hub plate 40, and the hub 10 of the armature plate 30, and the rotating body attached to the rotating shaft 2 (see FIG. (Not shown) rotates.

When the power supply to the electromagnetic coil 21 is stopped, the armature plate 30 is separated from the rotor 20 by the restoring force of the rubber damper 50, and the armature plate 30 is returned to the home position.

According to the electromagnetic clutch of this embodiment, the following effects can be obtained.

Since the rubber damper 50 is held by the hub plate 40, a container for holding the rubber damper 50 can be dispensed with, the labor for attaching the container to the hub plate 40 by welding or the like can be omitted, and the electromagnetic clutch can be manufactured at low cost. Can be manufactured.

Further, the rubber damper 50 can be securely held,
The damping effect of the rubber damper 50 is not reduced, and the electromagnetic clutch has high reliability and stable performance.

Further, since the length of the cylindrical portion can be shortened, reliability can be improved, weight can be reduced, and a cover for preventing entry of foreign matter can be omitted, so that an electromagnetic clutch can be manufactured at lower cost. Can be.

In the above embodiment, the shape of the rubber damper is rectangular, but the shape is not limited to this, and may be circular or triangular.

In this embodiment, the rubber damper 50 is used.
Although the case where three were used was shown, four or more may be used.

Further, in this embodiment, the bent portion 70A and the protruding portion 70B are formed. However, as another embodiment, the shape of the apex portion of the hub plate 40 is adjusted to the planar shape of the rubber damper 50, and the hub plate 40 The outer peripheral surface of the rubber damper 50 may be held over substantially the entire periphery only by the bent portion 70A at the vertex portion of.

Further, in this embodiment, the hub plate 40 is projected to form the projection integrally, but the projection 70B may be formed separately and fixed to the hub plate 40 by welding or rivets. .

[0047]

As described above, according to the electromagnetic clutch of the first and second aspects of the present invention, it is possible to eliminate the need for a container holding the elastic member, and to save time for attaching the container to the hub plate by welding or the like. It can be omitted and the electromagnetic clutch can be manufactured at low cost.

Further, the elastic member can be securely held, the damping effect by the elastic member does not decrease, and the electromagnetic clutch becomes highly reliable with stable performance.

Further, the length of the cylindrical portion can be shortened, the reliability can be improved, the weight can be reduced, and a cover for preventing entry of foreign matter can be omitted, and the electromagnetic clutch can be manufactured at lower cost.

[Brief description of the drawings]

FIG. 1 is a sectional view of an electromagnetic clutch according to an embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrow a in FIG. 1;

FIG. 3 is an enlarged view of a vertex portion of a hub plate.

FIG. 4 is a perspective view of a hub plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electromagnetic clutch 2 Rotating shaft 10 Hub 11 Flange part 12 Cylindrical part 15 Rivet (projection part) 20 Rotor 30 Armature plate 40 Hub plate 50 Rubber damper (elastic member) 70A Bend part 70B Projection part

Claims (2)

[Claims] 1. A hub having an armature plate attracted to a rotor during excitation, a cylindrical portion fixed to a rotating shaft, and a flange provided on the cylindrical portion and connected to the armature plate. A hub plate fixed to the flange portion and facing the armature plate in the axial direction; at least three protrusions provided on the armature plate along a circumferential direction; and mounted on an outer peripheral surface of each of the protrusions. An electromagnetic clutch comprising: an elastic member, wherein each of the elastic members is held by a bent portion formed by bending an outer peripheral edge of the hub plate in a direction opposite to the armature plate. clutch. 2. A projection for supporting each of said elastic members from a center side of said hub plate, said projection being formed by projecting said hub plate in a direction opposite to said armature plate. The electromagnetic clutch according to 1.