JPH0328527A - Solenoid clutch - Google Patents

Abstract

PURPOSE:To surely carry out elimination of pulses and facilitate assembling operation by composing a hub of inner and outer ring parts, and arranging an elastic body which allows relative elastic displacement between the outer and inner ring parts in an opposite cutout. CONSTITUTION:A disc-shaped flange 112, formed on one end of an inner boss 111, functions as a hub inner ring. A ring-shaped outer plate 113 functioning as a hub outer ring provided outside the flange 112 with a minute gap. When a clutch is driven, electricity is supplied to an exciting coil 12 and an armature 40 is attracted in the direction of a rotor 20, so that a plate spring 43 is elastically bent, and the armature 40 is moved in the direction of the rotor 20 to closly contact to and frictionally engage with a friction surface 22 of the rotor 20. As a result, the required elimination of pulses is surely carried out and assembling operation is facilitated because the housing structure of the plate spring is simplified.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to a motor which is disposed between a driving device and a driven device, and is adapted to intermittently transmit rotation from the driving device to the driven device. The present invention relates to an electromagnetic clutch suitable for, for example, a compressor used in a vehicle air conditioner.

[Conventional technology]

Conventionally, a typical dry single-plate electromagnetic clutch consists of a stator that generates magnetic force, a rotor supported by bearings to be rotated by the rotational force from the drive source, and a disc-shaped clutch that can be moved in the axial direction by the magnetic force of the stator. It consists of an armature.

For example, when an electromagnetic clubpiece with such a structure is installed and used in a compressor of a vehicle air conditioner, a stator that generates magnetic force is attached to the compressor, and a rotatable rotatable member is attached to the compressor via a bearing. It consists of a rotor attached to the rotor and an armature that is attached to a hub fixed to the compressor rotating shaft and can be moved in the axial direction by the magnetic force of the stator, and the friction surface of the armature that is opposite to the friction surface of the rotor is The rotor is attracted by the magnetic force generated by the stator, and the torque transmitted from the drive device is transmitted to the driven side of the compressor rotation shaft.

A method for attaching the armature to the hub so as to be movable in the axial direction is to attach the retaining plate attached to the armature and the hub via rubber pushers, and to move the armature in the axial direction using elastic deformation of the rubber bushing. Two methods are used: a rubber push method in which the armature and the hub are connected by a leaf spring, and the leaf spring elastically bends to allow the armature to move in the axial direction. The above rubber push method has the advantage that the armature and hub are connected so that they can be elastically displaced not only in the axial direction but also in the rotational direction, so that the pulsations of the clutch transmission torque can be absorbed by the elastic deformation of the rubber push.
There are problems with the durability of the rubber pusher and the problem that the axial length of the hub becomes large due to its structure, so a connection method using a leaf spring is often used.

[Problem to be solved by the invention]

The method of connecting the hub and armature via a leaf spring as described above has the advantage that the axial length of the hub can be shortened and the clutch can be made smaller. However, unlike in the case of rubber pushers, leaf springs do not bend in the direction of armature rotation, so they cannot absorb the pulsations of the transmitted torque at all, and when used in automobile air conditioners, the pulsations of the drive torque of the compressor is transmitted directly to the clutch drive side, causing problems such as slipping of the drive V-belt and vibration of various members.

In response to the above problem, Utility Model Application No. 63-44 was developed in an attempt to solve the problem by making the leaf spring absorb the deflection in the direction of rotation.
There is Publication No. 38. In this known technique, the leaf spring is shaped like a curved flat plate, and an elastic body is interposed at the connecting portion between the armature and the curved flat leaf spring, thereby making it possible to bend in the rotational direction.

However, in this known technique, since the deflection is absorbed by the elasticity of the curved flat plate itself, it is not always easy to obtain a predetermined deflection characteristic due to limitations such as the shape, and it is not always easy to obtain the desired deflection characteristics. Therefore, the structure of the connecting portion between the armature and the leaf spring becomes complicated, which may cause problems in terms of ease of assembly, durability, etc.

The present invention takes advantage of the advantage of the connection method using leaf springs, which is that the axial length of the hub can be shortened, and also realizes the absorption of deflection in the rotational direction without using leaf springs, thereby creating an electromagnetic clutch that can absorb pulsation. is intended to provide.

[Means to solve the problem]

According to the present invention, there is provided an electromagnetic clutch of a type that connects an armature and a hub using the above-mentioned leaf spring, and which includes a transmission torque pulsation absorbing mechanism using an elastic body inside the hub.

That is, in the present invention, the hub is composed of two members, an outer ring part and an inner ring part, which are independent of each other, the outer ring part and the armature are connected using a leaf spring, and the inner ring part is fixed to the rotating shaft. At the same time, the outer ring part is connected to the inner end of the leaf spring, and the inner ring part and the outer ring part are connected to each other via an elastic body so as to be rotationally displaceable.

[For production]

By virtue of the above-described structure, the leaf spring deflects in the axial direction when the clutch is actuated, causing frictional engagement between the armature and the rotor, and torque is transmitted by the elastic body interposed between the hub inner ring and outer ring. Since this is done via the elastic body, the pulsation of the transmitted torque is absorbed by the deflection of this elastic body.

〔Example〕

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

Referring to FIGS. 1 and 2, 100 is a housing of the compressor, and 101 is a rotating shaft of the compressor. Reference numeral 10 denotes a stator housing made of a magnetic material, and an excitation coil 12 is embedded within the stator housing with epoxy resin 13. This excitation coil 12 is connected to an external power source via a lead wire (not shown). Further, a mounting flange l1 is joined to the stator housing 10, and the stator housing lO is fixed to the compressor housing 100 via the mounting flange 11 with a circlip 102. Reference numeral 20 denotes a magnetic rotor to which a pulley 21 is attached, and is rotatably mounted on the compressor housing 100 via a bearing 30. The outer ring 31 of the bearing 30 is the rotor 30
The inner ring 32 is press-fitted into the compressor housing 10.
0 and is fixed to the housing 10{1 by a circlip 103. The friction surface 22 of the rotor 20 is provided with elongated holes 23 and 24 for the purpose of magnetic isolation.
The magnetic flux generated when the excitation coil is activated can be efficiently used when the armature is attracted. An armature μa 40 is arranged to face the rotor friction surface 22 with a small gap therebetween, and the armature 40 is made of a disk-shaped magnetic material, and has a magnetic cutoff elongated hole 41 as shown in FIG. It is located.

An inner boss 111 is fixed to the rotating shaft 101 with a key or a spline so as to rotate with the shaft, and a disc-shaped flange 112 is attached to one end of the inner boss 111.
is formed and functions as the inner ring of the hub. Further, a ring-shaped outer plate 113 corresponding to the above-mentioned hub outer ring is provided on the outside of the flange 112 with a minute gap therebetween, and the outer brake 113 is similarly fitted with leaf springs at three locations together with a ring-shaped cover plate 114. 43 with a rivet 45, and the other end of the leaf spring 43 is fixed to the armature 40 with a rivet 44.

Three locations on the outer periphery of the flange 112 and the outer plate 113
As shown in Fig. 3, there are cutouts 129 and 13 at three opposing locations on the inner periphery of the inner circumference, respectively, to cut out part of the circular arc by milling or the like.
0 and opposed notches 129. Each pair of 130, when combined with the flange 112 and outer plate 113, form three perfectly circular retaining holes 131, each of which has a portion of an arc, for example, as shown in FIG. A cut-out circular metal spring 117 is inserted.

The circumferential length of the spring 117 is such that the spring 117 can be placed in the notch 129 at any angular position when stored in the holding hole 131.
, 130.

In addition, the inner plate 115 is formed integrally with an inner sleeve 116 that fits into the inner diameter part of the inner boss 111, and after the inner sleeve 116 is fitted to the inner boss 111, a punching pin provided at the end of the inner boss 111 is formed. The outer plate 113 and the flange 112 are fixed to the inner boss 111 with 119 or bolts.
The circular spring 117 is prevented from falling off by covering the end face of the circular spring 117. The cover plate 114 covers the rotor side end surfaces of the outer plate 113 and the flange 112, and covers the circular spring 117.
A collar 118 is attached to the inner boss 112 to prevent it from falling off.
The armature 40, leaf spring 43, and outer plate 1l3 are held in place.

The rotor 20 receives V from an automobile engine (not shown).
- It is rotationally driven via a belt and a pulley 21, and when the clutch is activated, the excitation coil 12 is energized and the armature 40 is attracted in the direction of the rotor 20, the leaf spring 43 is elastically deflected and the armature 40 is moved toward the rotor. 20, and comes into close contact and frictional engagement with the friction surface 22 of the rotor 20. As a result, the rotational force of the rotor 20 is transferred to the armature 4.
0 and rotates the outer plate 113 via the leaf spring 43.

Since the outer plate 113 and the flange 112 are connected by the circular spring 113 inserted into the holding hole, the rotational force from the outer plate l13 is applied to the flange 11.
Inner boss 1 is transmitted to 2 and fixed to the compressor rotating shaft.
11 to drive a rotating shaft 101.

As described above, the outer plate 113 and the flange 112
Since they are connected to each other via a circular spring 117, relative displacement in the rotational direction is possible by bending the circular spring 117. Therefore, the pulsations of the drive torque of the compressor during clutch operation and the impact torque when the armature 40 engages with the rotor friction surface 22 can be absorbed by the elastic deformation of the circular spring, and the pulsations of the transmitted torque and the impact torque are absorbed by the elastic deformation of the circular spring. can be prevented from being transmitted to the armature side. Further, since the absorption of pulsation is performed by elastic deformation of the metallic circular spring 117, the durability is higher and the length in the axial direction can be shortened compared to the case where a rubber pusher is used as described above.

In the above embodiment, the metallic circular spring 117 shown in FIG. 4 is used to absorb pulsation, but other elastically deformable members can also be used. For example, as shown in FIG. If the pulsation is small and durability is not a problem, a rubber disk as shown in FIG. 6 may be used.

〔Effect of the invention〕

Since the present invention has a structure in which the elastic body is arranged in opposing notches formed in the outer ring and the inner ring that constitute the hub, it is possible to freely set the elastic modulus of the elastic body without any constraints. The desired pulsation absorption can be reliably achieved, and the structure for storing the elastic body is simplified, so that the assembly work is facilitated.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing the features of the embodiment of the present invention. FIG. 2 is a front view of the same embodiment as seen from the armature side. FIG. 4 is a plan view and a side view of a circular spring used in the above embodiment, FIG. 5 is a plan view showing the shape of a bending spring, and FIG. 6 is a plan view and a side view of a rubber disc. DESCRIPTION OF SYMBOLS 10... Stator housing, l2... Excitation coil, 20... Rotor, 22...
Rotor friction surface, 30... Bearing, 40... Armature, 43... Leaf spring, 101... Compressor rotating shaft, 111... Inner boss, 112... Flange, 113... Outer Plate, 114... Cover plate, 115... Inner plate, 116... Inner sleeve, 117... Circular spring, 118... Collar, 1
19... bottle, 129, 1.30...
Notch, 131...retaining hole. 22... Rotor friction surface 117... Circular spring 118... Collar Fig. 2 44.45... Rivet 114... Cover plate 119... Bin 130 129 3rd Fig. 131... Retaining hole Figure 4 Figure 5 Figure 6

Claims (1)

[Scope of Claims] 1. A stator having an excitation coil, a rotor that is rotationally driven from a drive source and has a friction surface on one side, and a friction surface that opposes the friction surface of the rotor, and a rotor that is connected to the rotor. The armature is provided with a disc-shaped armature coaxially arranged around a rotating shaft with a predetermined gap therebetween, and a hub fixed to the rotating shaft, and the armature is connected to the hub in the axial direction through a plurality of leaf springs. In the movably connected electromagnetic clutch, the hub includes an inner ring portion and an outer ring portion that are mutually rotatable, the leaf spring is connected to the outer ring portion, and the rotating shaft is fixed to the inner ring portion. An electromagnetic clutch, wherein an elastic body that allows relative elastic displacement between the outer ring part and the inner ring part in the rotation direction is disposed in opposing notches formed in the outer ring part and the inner ring part.