WO2002070914A1

WO2002070914A1 - Electromagnetic coupling device

Info

Publication number: WO2002070914A1
Application number: PCT/JP2002/001922
Authority: WO
Inventors: Yoshihiro Kurosu
Original assignee: Ogura Clutch Co., Ltd.
Priority date: 2001-03-02
Filing date: 2002-03-01
Publication date: 2002-09-12
Also published as: JPWO2002070914A1

Abstract

An electromagnetic coupling device comprising a hub (6) provided with press faces (10d) at an interval in the rotational direction, an armature (13) coupled with the hub (6) such that it can move in the axial direction and can displace relatively in the rotational direction, a resilient member (11) coupling the armature (13) and the hub (6), a rotor (4) having a frictional face attracting the armature (13) magnetically and an annular engaging face (4e) projecting in the axial direction from the frictional face and extending to the radial outside of the press face (10d) of the hub (6), an engaging member (17) provided between the engaging face (4e) of the rotor (4) and the press face (10d) of the hub (6) and engaging frictionally with the engaging face (4e) of the rotor (4) through relative displacement of the hub (6) and the armature (13) in the rotational direction, and an exciting coil (20) generating a magnetic flux for attracting the armature (13) magnetically to the frictional face of the rotor (4) while resisting against resilient resetting force of the resilient member (11) in the axial direction. When the hub (6) and the armature (13) displace relatively in the rotational direction while resisting against resilient resetting force of the resilient member (11), the engaging member (17) is pressed by the press face (10d) of the hub (6) to engage frictionally with the engaging face (4e) of the rotor (4).

Description

Background of the Invention

The present invention relates to an electromagnetic coupling device, and more particularly, to an electromagnetic coupling device in which power transmission force is increased by a relative displacement between the armature and the hub in the rotation direction.

The electromagnetic coupling device has a hub attached to the rotating shaft of the driven device, an armature connected to this hub by an elastic member such as a leaf spring or damper rubber, and a belt that can rotate integrally with the driven device. And an excitation coil that generates a magnetic flux when energized. In such a configuration, power is transmitted from the driving-side device to the driven-side device by the frictional engagement force between the friction surface of the armature and the friction surface of the mouth due to the magnetic attraction of the excitation coil.

In the conventional electromagnetic coupling device described in Japanese Patent Application Laid-Open No. 55-24469, when the load on the driven device is large, the friction surface of the armature and the friction surface of the rotor slip and rotate. . To prevent this, a pole-type cam operating mechanism is provided between the hub flange and the armature. In the conventional electromagnetic coupling device configured as described above, when the hub and the armature make a relative displacement in the rotational direction against the elastic return force of the elastic member in the rotational direction, the displacement is determined by a ball type. The cam operation mechanism converts the relative displacement in the axial direction between the hub and the armature to increase the frictional engagement force between the armature and the rotor.

The conventional electromagnetic coupling device described above consists of a bearing that rotatably supports a hub on the boss portion of the rotor, a bearing that rotatably supports the hub on the rotating shaft of the driven device, and a rotation shaft that rotates in the driven device. Since the reaction force of the pressing force that presses the armature to the armature works freely on the freely supported bearings, the durability of the bearing is poor and the service life is short. An object of the present invention is to provide an electromagnetic coupling device that improves the durability and the life of a bearing. Summary of the Invention

The electromagnetic coupling device according to the present invention is characterized in that the first friction surface to which the main power is transmitted and the overload A motor having an annular second friction surface through which power is transmitted, an armature urged in a direction away from the rotor and frictionally engaging the first friction surface of the rotor, and power transmission. An electromagnetic drive means for driving the armature, connecting the armature to the rotor via the first friction surface against the urging force on the armature, and a hub rotating integrally with the armature; The armature is connected to the hub, and is elastically displaced in the event of an overload. And an engaging member to be engaged.

In this configuration, when the hub and the armature are relatively displaced in the rotation direction against the elastic return force in the rotation direction of the elastic member due to the load of the driven device, the engagement member is lowered. The power transmission force increases due to frictional engagement with the second friction surface in the evening. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a plan view of an electromagnetic coupling device according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line 11-11 of FIG.

FIG. 3 is a plan view of the stopper plate to which the rubber cover is fixed.

4A is a plan view of the pressing plate shown in FIGS. 1 and 2, and FIG. 4B is a cross-sectional view of the pressing plate shown in FIG. 4A.

5A is a plan view of the guide member shown in FIGS. 1 and 2, and FIG. 5B is a side view of the guide member shown in FIG. 5A.

FIG. 6 is a plan view showing a state where the engaging member is pressed against the engaging surface of the rotor.

FIG. 7 is a plan view of an electromagnetic coupling device according to a second embodiment of the present invention.

FIG. 8 is a plan view of an electromagnetic coupling device according to a third embodiment of the present invention.

FIG. 9 is a sectional view taken along the line III-III in FIG.

FIG. 10 is a view taken along the line IV-IV in FIG.

FIG. 11 is a view showing a state in which the engaging member is pressed against the engaging surface of the rope in the electromagnetic coupling device shown in FIG.

FIG. 12 is a plan view of an electromagnetic coupling device according to a fourth embodiment of the present invention.

FIG. 13 is a plan view of an electromagnetic coupling device according to a fifth embodiment of the present invention.

FIG. 14 is a cross-sectional view of the electromagnetic coupling device shown in FIG. Detailed description of the embodiment

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 to 6 show an electromagnetic coupling device according to a first embodiment of the present invention. As shown in FIGS. 1 and 2, the electromagnetic coupling device of this embodiment is formed on an armature assembly 2 mounted on a rotating shaft 1a of a compressor 1 for an automobile air conditioner, and on a housing of the compressor 1. The rotor 4 is rotatably supported by the cylindrical portion 1 b via the bearing 3 and is disposed concentrically with the hub 6 of the armature assembly 2, and the yoke fixed to the housing of the compressor 1. 5 is provided. The electromagnetic coupling device configured as described above is mounted on the compressor 1 as a driven device, and transmits the power of the driving device (vehicle engine) to the compressor 1.

In the armature assembly 2, the stopper plate 8 and the pressing plate 10 are fixed to the flange 6 a of the hub 6 spline-fitted to the tip of the rotating shaft 1 a by three rivets 7. As shown in FIG. 3, the stopper plate 8 divides an annular substrate portion 8b having an insertion hole 8a of a port 19 at the center and a circumferential direction of the substrate portion 8b into three equal parts. And three support plate portions 8c extending radially outward from the substrate portion 8b. The substrate part 8b and each support plate part 8c are formed integrally. A large-diameter through hole 8d is drilled at the end of each support plate portion 8c, and each support plate portion 8c is concentric with the through hole 8d and the through hole 9a drilled at the bottom. A cylindrical rubber cover 9 with a bottom is fixed to the tip of the rubber cover. Reference numeral 8e is a through hole into which the rivet 7 is inserted. As shown in FIGS. 4A and 4B, the pressing plate 10 has an annular substrate portion 10a having an insertion hole 10b of a port 19 in the center, and a circle of the substrate portion 10a. It is composed of three pressing parts 10 c extending radially outward from the substrate part 10 a so as to divide the circumferential direction into three equal parts. The substrate portion 10a and the pressing portions 10c are integrally formed of a material such as carbon steel for mechanical structure. The tip of each pressing portion 10 c is formed in a concave shape so as not to abut on the outer peripheral surface of the rubber cover 9, and the width 2 of each pressing portion 10 (: is the supporting plate portion 8 of the stopper plate 8. c is set to be larger than the width dimension L1.

Therefore, by pressing the pressing plate 10 concentrically on the stopper plate 8 and fixing it to the hub 6 with the rivets 7, the side surface of the pressing portion 10 c on the front side in the rotation direction T becomes the support plate portion 8. It protrudes forward in the rotation direction from the side surface in the rotation direction front of c. Further, the side surface of the pressing portion 10c on the rear side in the rotation direction T projects rearward in the rotation direction from the side surface on the rear side in the rotation direction of the support plate portion 8c. The side surface of the pressing portion 10c on the rear side in the rotation direction functions as a pressing surface 10d for pressing an engagement member 17 described later. Reference numeral 10 e denotes a stepped through hole into which the rivet 7 is inserted. A damper rubber 11 as an elastic member is fitted in a rubber cover 9 having a through hole 9a formed in the center. One side of the damper rubber 11 abuts the periphery of the through hole 9 a (the bottom of the rubber cover 9), and the other side of the damper rubber 11 has a protrusion 1 protruding toward the opening side of the rubber cover 9. 1a is formed in the body. The torque transmission pin 12 is inserted into the through hole 9a of the damper rubber 11. The protrusion 11 a of the damper rubber 11 is formed to have a size smaller than a size of an air gap set between a friction surface of the armature 13 and a friction surface of the rotor 4 described later.

The torque transmission pin 12 has a disk-shaped head 1 2a, a cylindrical body 1 2b whose outer diameter is smaller than the head 12a, and an outer diameter that is larger than the body 1 2b. It has a small cylindrical leg 12c integrally. With the damper rubber 11 held between the head 12 a and the bottom of the damper cover 9, the torque transmission pin 12 has a leg 1 2 c protruding from the through hole 8 d of the stopper plate 8. The armature 13 is crushed in the stepped hole 13 a of the armature 13 and is fixed integrally to the armature 13.

By crushing the leg 1 2 c of the torque transmission pin 12, the end surface of the body 1 2 b of the torque transmission pin 12 comes into contact with the anti-friction surface of the armature 13 (the surface not facing the rotor 4). . At the same time, the damper rubber 11 is compressed in the axial direction between the head 12 a of the torque transmission pin 12 and the bottom of the rubber cover 9. The damper rubber 11 is provided with an initial elastic restoring force for holding the armature 13 away from the rotor 4 described later, and the initial elastic restoring force of the damper rubber 11 causes the armature 1 3 The anti-frictional surface of abuts against the stopper plate 8.

In the armature 13, stepped holes 13 a and 13 b are formed at positions that divide the circumferential direction into six equal parts. The stepped holes 13a and the stepped holes 13b to which the support pins 15 of the engaging device 14 are fixed are alternately provided in the circumferential direction. The engagement device 14 is fitted to the outer peripheral surface of the support pin 15, a cylindrical damper rubber 16 having a through hole into which the support pin 15 is inserted, and a cylindrical damper rubber 16. Cylindrical engagement ring 17 and engagement ring 1 It is composed of a pressing surface 10 d of the hub 6 pressing the 7, and an engaging surface 4 e of the rotor 4 on which the engaging ring 17 frictionally engages.

The engagement ring 17 as the engagement member is manufactured from the same type of carbon steel for mechanical structure as the rotor 4 armature 13. The support pin 15 for supporting the engagement ring 17 has a disk-shaped head 15 a, a torso 15 b having an outer diameter smaller than that of the head 15 a, and an outer than the torso 15 b It has a cylindrical leg 15 c with a small diameter in one piece. The support pin 15 is fixed to the armature 13 by crushing the leg 15 c in the stepped hole 13 b of the armature 13. The outer peripheral edge of the contact surface with the side surface of the damper rubber 16 is chamfered in an arc shape so that the edge of the head 15 a of the support pin 15 does not bite into the side surface of the damper rubber 16. .

At the end of the engagement ring 17 on the armature 13 side, an annular flange portion 17a facing the center extends. Guide member 1 8 between flange 17 a and armature 13

(Described later), whereby the engagement ring 17 is displaced by sliding on the anti-friction surface of the armature 13 via the guide member 18. By crushing the leg 15 c of the support pin 15 in the stepped hole 13 b, the damper rubber 16 is connected to the dot 17 a of the engagement ring 17 and the head 15 a of the support pin 15. Along the axis, it is compressed in the axial direction, and an elastic return force is applied in the axial direction. The elastic restoring force applied to the damper rubber 16 in the axial direction is set to a small elastic restoring force such that the vibration of the engagement ring 17 is prevented.

As shown in FIGS. 5A and 5B, the guide member 18 made of a non-magnetic material (stainless steel) has a through hole 18a into which the body 15b of the support pin 15 is inserted. Sliding part 18 b with the engaging ring 17, the mounting part 18 c to the armature 13 formed at both ends of the sliding part 18 b, and the sliding part 18 b And a pair of guide portions 18d formed integrally with the mounting portion 18c and projecting in the axial direction. The inner surface (side surface of the sliding portion 18b) of the guide portion 18d functions as a guide surface 18e for moving the engagement ring 17 in the radial direction.

The armature assembly 2 configured as described above has the stopper plate 8 and the pressing plate 10 overlapped on the flange portion of the hub 6 and is integrally fixed by rivets 7. The engagement ring 17 is provided with the leg 15 c of the support pin 15 in the stepped hole 13 b of the armature 13 with the sliding portion 18 b of the guide member 18 interposed. By crushing, Mature 13 supported by. The mounting portion 18a of the guide member 18 is fixed to the armature 13 with screws so that a pair of parallel guide surfaces 18e extend in a straight line passing through the center of the hub 6.

By fitting the damper rubber 1 1 into the rubber cover 9 and crushing the leg 1 2 c of the torque transmission pin 1 2 into the stepped hole 13 a of the armature 13, the armature 13 is The bracket 6 is supported so as to be capable of moving in the axial direction and relative displacement in the rotating direction. The engagement ring 17 supported by the armature 13 is provided between two adjacent pressing portions 10c while being in contact with the pressing surface 10d of the pressing plate 10. The armature assembly 2 assembled in this manner has the hub 6 spline-fitted to the rotating shaft 1a, and the port 19 inserted through the through hole 8a of the stopper plate 8 is connected to the rotating shaft 1a. By being screwed into the screw hole of, it is mounted so as to be able to rotate integrally with the rotating shaft 1a. The armature 13 of the armature assembly 2 faces the friction surface of the rotor 4 with an air gap (for example, a gap of about 0.2 to 0.5 mm). The roller 4 has an inner cylindrical portion 4a in which the outer ring of the bearing 3 is press-fitted and fixed, an outer cylindrical portion 4b having multiple V-shaped grooves formed on the outer peripheral surface, and an inner cylindrical portion 4a A disk portion 4c having a friction surface facing the armature 13 by connecting the end portion with the cylindrical portion 4b, and an axially opposite side from the outer peripheral surface of the disk portion 4c to the outer cylindrical portion 4b. And a cylindrical protruding portion 4 d protruding from the friction surface, and these are integrally formed. The inner peripheral surface of the protrusion 4 d of the rotor 4 extending to the outside in the radial direction of the engagement ring 17 is an engagement surface radially opposed to the outer periphery of the engagement ring 17 with a slight gap. 4 Functions as e. A friction plate may be fixed to the outer peripheral surface of the engagement ring 17 or the engagement surface 4e of the rotor 4.

The rotor 4 has an inner cylindrical portion 4a, an outer cylindrical portion 4b, and a disk portion 4c that form an annular groove that opens to the compressor 1 side. A cylindrical yoke 5 is inserted into the annular groove. You. The yoke 5 has an annular groove which is open on the side of the disk portion 4 c of the mouth 4, and which accommodates the exciting coil 20. The yoke 5 is supported by the compressor 1 by fixing the mounting plate 21 welded to the back surface to the housing of the compressor 1 with screws.

Next, the connection operation of the electromagnetic connection device thus configured will be described.

When the excitation coil 20 is energized, the armature 13 will be in the axial direction of the damper rubber 11 Magnetically attracted to the friction surface of the rotor 4 against the elastic return force in the opposite direction. Since the rotor 4 is connected to a pulley on the vehicle engine side (not shown) by a belt, the power of the vehicle engine is transmitted to the compressor 1.

During the normal operation of the compressor 1, the front side in the rotational direction T of the damper rubber 11 is compressed in the rotational direction between the body 12b of the torque transmission pin 12 and the inner peripheral surface of the rubber cover 9. You. When the load on the compressor 1 further increases from this state, the damper rubber 11 is further compressed by the elastic return force in the rearward direction in the rotation direction. That is, when the damper rubber 11 is compressed by the load of the compressor 1, the armature 13 and the knob 6 are relatively displaced in the rotation direction.

Due to this relative displacement, the engagement ring 17 supported by the armature 13 is pressed by the pressing surface 10 d of the pressing plate 10, and piles on the elastic return force of the damper rubber 16, and the guide member 18 It is guided by the guide surface 18 e and moves radially outward. At this time, the jaw 17a of the engagement ring 17 is guided on the guide surface 18e while sliding on the sliding portion 18b of the guide member 18. By moving the engagement ring 17,

The engagement ring 17 abuts the protrusion 4 d of the roller 4, and the outer peripheral surface of the engagement ring 17 frictionally engages with the inner peripheral surface (engagement surface 4 e) of the protrusion 4 d.

As a result, the frictional force between the friction surface of the armature 13 and the friction surface of the armature 4 due to the magnetic attraction of the excitation coil 20 and the engagement ring 17 supported by the armature 13 and the mouth Due to the frictional engagement force between the overnight surface 4 and the engagement surface 4e, the power is transmitted from the low speed 4 to the hub 6.

Thereafter, when the load on the compressor 1 decreases, the relative displacement of the armature 13 and the hub 6 in the rotation direction also decreases due to the elastic return force of the damper rubber 11 in the rotation direction. As a result, the engagement ring 17 is separated from the engagement surface 4 e by the elastic return force of the damper rubber 16.

Next, an electromagnetic coupling device according to a second embodiment of the present invention will be described. Note that, in this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the electromagnetic coupling device shown in FIG. 7, the inner peripheral surface of the protrusion 22a of the rotor 22 is used as an engagement surface 22b on which the engagement ring 17 frictionally engages. Engagement surface 2 2 b around the circumference A locking portion 22c slightly raised toward the center is formed in the body at a position equally divided into three directions. The front side in the rotation direction of the locking portion 22c functions as an arc-shaped stopper surface 22d. The electromagnetic coupling device configured as described above can transmit power and cut off power transmission as in the first embodiment.

During power transmission, when the load on the compressor 1 increases, the armature 13 and the hub 6 are relatively displaced in the rotation direction, and the engagement ring 17 frictions with the engagement surface 2 2 b of the rotor 22. Engage. If the armature 13 slips and rotates while the engagement ring 17 and the engagement surface 2 2b are in frictional engagement, the engagement ring 17 collides with the stopper surface 2 2 d of the rotor 22. I do. Until the load on the compressor 1 is reduced, with the engagement ring 17 held between the pressing surface 10 d of the hub 6 and the stopper surface 2 2 d of the mouth 22, the hub 6 and the mouth 2 and 2 are combined. As a result, slip rotation of the armature 13 is prevented.

In the first and second embodiments, the hub 6, the stopper plate 8, the rubber cover 9, and the pressing plate 10 are formed as separate members, but are integrally formed of reinforced plastic or aluminum alloy. be able to. Also, as the elastic member for connecting the armature 13 to the hub 6, a plurality of damper rubbers 11 divided in the rotation direction are provided, but the armature 13 is attached to the hub 6 by an elastic member such as a leaf spring. It can also be a supported structure.

Next, an electromagnetic coupling device according to a third embodiment of the present invention will be described.

As shown in FIG. 8, the electromagnetic coupling device of this embodiment is formed on an armature assembly 102 mounted on a rotating shaft 101a of a compressor 101 and a housing of the compressor 101. The rotatable cylinder 104, which is rotatably supported by the cylindrical portion 101b via a bearing 103, and is disposed concentrically with the hub 106 of the armature assembly 102, and the compressor 1 The yoke 105 is fixed to the housing 01. In the following description, the side of each component viewed from the armature assembly 102 side (the side viewed from the left side in FIG. 9) is referred to as the outer side, and each side viewed from the compressor 101 side. The side of the component (side viewed from the right in Fig. 9) will be described as the inner side.

The armature assembly 102 consists of a hub 106, a power transmission plate 107, a damper rubber 108, an engagement ring 111 as an engagement member, and an armature 113. It is. The boss portion 106 a of the hub 106 is a rotating shaft 101 a of the compressor 101.

And is fixed with a nut 101c screwed to the tip of the rotating shaft 101a. The hub 106 has a flange portion extending outward in the radial direction with an interval in the rotational direction (on an equally-divided wiring (not shown) that divides the outer peripheral surface of the boss portion 106a into three). 6 b is formed. Each of the flange portions 106 b has a radially inner portion provided as a substantially rectangular pressing portion 106 c and a radially outer portion provided as a substantially fan-shaped support portion 106 d.

The hub 106 is provided on both ends of the pressing portion 106c in the circumferential direction and on the outer peripheral surface of the concave arc portion between the adjacent pressing portions 106c in the axial direction (of the rotation axis 101a). In the protruding direction), a bent portion 106 e is formed. In the bent portion 106 e, the surface of the pressing portion 106 c that protrudes in the axial direction from the rear end in the rotation direction of the pressing portion 106 c is referred to as a pressing surface 106 f. The flange portion 106 b of the hub 106 is formed in a shape in which the substantially central portion in the radial direction is narrowed, but this is a relief groove for the concave portion 107 a of the power transmission plate 107. This is a design for forming Therefore, the design can be changed to a structure in which the flange portion 106b has no constriction.

On the support portion 106 d of the hub 106, an annular power transmission plate 107 provided on the outer surface side of the hub 106 is provided with a damper rubber 100 1 for power transmission as a first elastic member. By means of 8, they are connected so that they can rotate together. As shown in FIG. 10, the power transmission plate 107 has a concave portion 107a formed at the three equally distributed positions and an arc-shaped connecting portion 100 connecting the adjacent concave portions 107a. Has 7b. Each recessed portion 107a is connected to the support portion 106d of the hub 106 such that the recessed portion 107a is radially outward of the bent portion 106e of the tab 106. At the bottom of the concave portion 107a, there is provided an extruded portion that is press-extruded from the outer surface side to the inner surface side, and the anti-friction surface of the armature 113 contacts the inner surface of the extruded portion. I do.

Each recessed portion 107a of the power transmission plate 107 extends in the direction of a straight line (equally divided wiring that divides the circumferential direction into three equal parts) with the walls facing each other in the rotation direction passing through the center of the hub 106. It is formed on a pair of parallel guide surfaces 107c. The damper rubber 108 is formed in a substantially sector shape in plan view, the inner surface is fixed to the support 106 d of the hub 106, and the outer surface is It is fixed to the connecting portion 107 b of the arrival plate 107. The engagement ring 111 is fitted around the headed support pin 110, and the first ring is provided between the outer peripheral surface of the support pin 110 and the inner peripheral surface of the engagement ring 111. The damper rubber 1 1 2 for returning the engagement ring as the elastic member 2 is press-fitted.

The support pin 110 includes a body 110a inserted into a through hole of the damper rubber 112, a leg 110b, and a head 110c. The leg 110b is formed to have an outer diameter smaller than the body 110a, and is inserted into a through-hole formed in the bottom of the recess 107a of the power transmission plate 107a. Is crushed in the stepped hole drilled in the armature 1 1 3. The head 110c has an outer diameter larger than the body 110a, and abuts against the outer surface of the damper rubber 112. The engagement ring 1 1 1 is interposed between the cylindrical portion fitted to the outer peripheral surface of the damper rubber 1 1 2, the outer surface of the bottom of the recess 10 Ί a and the inner surface of the damper rubber 1 1 2. And an annular inward flange portion 111a, which are integrally formed.

The armature assembly 102 is provided with such a support pin 110, an engagement ring 111 and a damper rubber 112. With the end surface of the body 110 a of the support pin 110 abutting against the bottom of the recess 110 a of the power transmission plate 107 a, attach the leg 11 b of the support pin 110 Crush in armature 1 1 3 stepped hole. Thus, the anti-friction surface of the armature 113 contacts the stopper portion 109 formed integrally with the damper rubber 108. Reference numeral 106 g denotes a notch groove formed on the outer peripheral surface of the flange portion 106 b of the hub 106.

The friction surface of the armature 113 faces the friction surface of the rotor 104 in the axial direction with the friction surface of the rotor 104 via an air gap. The rotor 104 has an annular groove 104 a opened on the housing side of the compressor 101, and a belt groove 1 formed on the outer peripheral surface of an annular peripheral wall radially outside the annular groove 104 a. And a cylindrical portion 104c protruding axially outward from the friction surface. The inner peripheral surface of the cylindrical portion 104c functions as an engagement surface 104d with which the engagement ring 111 frictionally engages. The yoke 105 in which the exciting coil 114 is provided is inserted into the annular groove 104 a of the row 104. Next, the operation of the electromagnetic coupling device thus configured will be described.

The damper rubber 108 depends on the load of the compressor during steady operation of the compressor 101. It is elastically deformed in the rotation direction. When the load on the compressor 101 further increases from this state, the damper rubber 108 further elastically deforms, and the hub 106 and the armature 113 relatively displace in the rotation direction. At this time, the engagement ring 111 slides on the anti-friction surface of the armature 113 via the concave portion 107a of the power transmission plate 107 to be displaced. When the relative displacement in the rotational direction between the hub 106 and the armature 113 increases, as shown in FIG. 11, the engagement ring 1 11 is moved by the pressing surface 106 f of the hub 106. Mouth — pressed into engagement surface 104 d of evening 104. As a result, the frictional engagement force between the armature 113 and the mouth 104 and the frictional engagement force between the engagement ring 111 and the engagement surface 104d of the mouth 104, Power of the vehicle engine can be transmitted to the compressor 101.

Thereafter, when the load on the compressor 101 decreases, the relative displacement in the rotation direction between the hub 106 and the armature 113 decreases due to the elastic return force of the damper rubber 108, and the engagement occurs. The ring 111 is separated from the engaging surface 4d of the rotor 104 by the elastic return force of the damper rubber 112. The engagement ring 111 moves in the radial direction while being guided by a pair of guide surfaces 107c provided in the concave portion 107a of the power transmission plate 107. Next, an electromagnetic coupling device according to a fourth embodiment of the present invention will be described. Note that, in this embodiment, the same components as those in the third embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the electromagnetic coupling device shown in FIG. 12, the inner peripheral surface of the cylindrical portion 115 a of the rotor 115 has an engaging surface 111 on which an engaging ring 111 as an engaging member frictionally engages. Functions as b. At a position where the engagement surface 115b is divided into three equal parts in the circumferential direction, a locking part 115c slightly raised toward the center is formed on the body. The front side in the rotation direction of the locking portion 115c functions as an arc-shaped stopper surface 115d. The electromagnetic coupling device having such a configuration can transmit power and cut off power transmission in the same manner as the electromagnetic coupling device according to the third embodiment.

Also, when the load on the compressor 101 increases during power transmission, the armature 113 and the hub 106 are relatively displaced in the rotational direction, and the engagement ring 1 1 1 5 is frictionally engaged with the engagement surface 1 15 b. When the armature 1 13 slips and rotates while the engagement ring 1 1 1 and the engagement surface 1 15 b are in frictional engagement, the engagement ring 1 11 collides with the stopper surface 1 15 d of Rho 1 115. Thereafter, until the load on the compressor 101 decreases, the engagement ring 1 1 1 between the pressing surface 106 f of the hub 106 and the stop surface 1 15 d of the mouth 1 1 5 The hub 106 and the rotor 115 are joined together while holding the hub. As a result, slip rotation of the armature 113 is prevented.

In the third and fourth embodiments, the head 1 110 c of the support pin 110 and the inward flange 1 1 1 a of the engagement ring 1 11 are omitted, and the damper rubber 1 1 2 The inner peripheral surface of the support pin 110 may be fixed to the outer peripheral surface of the body 110a of the support pin 110, and the outer peripheral surface of the damper rubber 112 may be fixed to the inner peripheral surface of the engagement ring 111. .

Further, in the first to fourth embodiments, the case where damper rubber is used as the first and second elastic members has been described, but a leaf spring may be used.

In the above-described first to fourth embodiments, the first elastic member is inserted into the power transmission path (mouth-> armature-hub-rotation shaft) to perform power transmission and armature release. Further, the second elastic member is inserted into the power transmission path (opening—evening—engaging device—rotary shaft) when the rotating shaft is overloaded, and performs power transmission and release of the engaging ring of the engaging device. In this case, the power transmission is performed in parallel via the first and second elastic members, but the power transmission may be performed only by the second elastic member. An electromagnetic coupling device in which the first flexible member is used only for armature release will be described below as a fifth embodiment.

FIGS. 13 and 14 show an electromagnetic coupling device according to a fifth embodiment of the present invention. The electromagnetic coupling device of the present embodiment includes a hub 206 mounted on a rotating shaft 201 a of a compressor 201 and a cylindrical portion of a front housing of the compressor 201 rotatably via a bearing. And a supported rotor 204. The pressing surface 206 f formed on the outer peripheral end surface of the flange portion 206 b of the hub 206 and the inner peripheral engaging surface of the cylindrical projecting projection 204 d of the rotor 204 are formed. An engagement device 214 supported by the armature 211 is provided between them.

As shown in Fig. 13, the flange portion 206b of the hub 206 forms a pressing surface 206f on the end face of the notch by cutting the arc portion of the disk in three straight lines. To achieve. The outer peripheral surface of the boss portion 206 a of the hub 206 is connected to the aluminum guide member 2 1 The hub 206, the guide member 218, and the armature 213 are arranged coaxially by inserting into the center hole of the disc portion 2 18a of FIG. The guide member 2 18 is composed of a disk portion 2 18 a and a guide portion 2 18 b protruding radially outward from the disk portion 2 18 a in three directions. Both sides of the guide portion 218b are bent at a right angle in the axial direction to guide the engagement device 214 in the radial direction.

The engaging device 2 14 is provided between the inner cylindrical member 2 21, the outer engaging ring 2 17, and the outer peripheral surface of the cylindrical member 2 21 and the inner peripheral surface of the engaging ring 2 17. And a damper rubber 216 as a power transmission elastic member (second elastic member) interposed therebetween. The engagement device 2 1 4 has a support pin 2 1 with the cylindrical member 2 2 1 sandwiched between the guide portion 2 18 b of the guide member 2 18 and the anti-friction surface of the armature 2 13. It is fixed to the amateur 2 13 by 5. Note that the inner peripheral surface and the outer peripheral surface of the damper rubber 216 need not be fixed to the outer peripheral surface of the cylindrical member 221 and the inner peripheral surface of the engagement ring 217, respectively.

Between the flange portion 206 b of the hub 206 and the disk portion 218 of the guide member 218, the friction surface of the armature 213 is separated from the friction surface of the base member 204. A damper rubber 222 is provided as an elastic member (first elastic member) for releasing the armature. The damper rubber 222 causes the armature 214 to be separated from the row 204 when the excitation coil is cut off. Reference numeral 209 denotes a stopper rubber having the same function as the stopper portion 109 of FIG.

Next, the operation of the electromagnetic coupling device thus configured will be described. When the armature 2 13 is magnetically attracted to the mouth 204, the armature 204 is engaged to the armature 2 13 — damper rubber 2 16 — engagement ring 2 1 7 — hub 206. A parallel magnetic transmission path is formed. During this power transmission, when the load on the compressor 201 further increases, the hub 206 and the armature 21 13 relatively displace against the return force of the damper rubber 2 16. As a result, similarly to the above, the engagement ring 2 17 is guided by the guide portion 2 18 b and moves in the radial direction, and the engagement surface 2 4 4 Engage with e.

As described above, according to the present invention, the engagement ring supported by the hub is pressed against the engagement surface at the outside of the mouth in the radial direction, so that the durability of the bearing is improved and the life is extended. Is achieved.

In addition, since the hub and the mouth rotate integrally with the engagement ring being sandwiched between the pressing surface of the hub and the stopper surface of the rotor, slip rotation of the armature caused by overload of the driven device does not occur. As a result, wear of the armature and friction surface of the mouth and heat generation can be reliably prevented.

Further, the engagement ring can be quickly separated from the engagement surface of the rotor by the elastic return force of the second elastic member. Further, the engagement ring is guided by the pair of guide surfaces of the power transmission plate and moves in the radial direction to frictionally engage with the engagement surface of the rotor efficiently.

Also, by simply press-fitting the second elastic member between the outer peripheral surface of the support pin and the inner peripheral surface of the engagement ring, it is possible to prevent the engagement ring from falling off or scattering due to external vibration or centrifugal force. Can be. Further, the engaging ring supported by the support pin via the second elastic member is not pressed and inclined by the pressing surface of the hub, and the outer peripheral surface of the engaging ring and the engaging surface of the rotor are not biased. Wear can be prevented.

In addition, since the engagement ring is supported by the armature, the engagement ring is prevented from falling off or scattering due to external vibration or centrifugal force. Further, the engagement ring moves on a straight line passing through the center of the hub, so that the engagement ring is efficiently frictionally engaged with the engagement surface of the mouth concentric with the hub. Further, the engagement ring can be separated from the engagement surface of the mouth by the elastic return force of the damper rubber. Further, since the guide member is made of a non-magnetic material, it is possible to prevent a decrease in magnetic attraction force for magnetically attracting the armature to the rotor.

In the fifth embodiment, the guide member 218 is made of aluminum and is formed separately from the hub 206 to prevent magnetic leakage. 6 can be attached together. In this case, the guide member 218 is made of a non-magnetic panel so that only the guide portion 218b or the entire guide portion 218 (the disc portion 218a and the guide portion 218b) is elastically deformed. It may be made of steel plate or plastic material. In this case, it is also possible to configure the guide member 218 as a first elastic member for power transmission and armature return without incorporating the damper rubber 222.

Claims

The scope of the claims

1. A rotor having a first friction surface to which main power is transmitted and an annular second friction surface to which power is transmitted when overloaded,

An armature biased in a direction away from the mouth and frictionally engaging the first friction surface of the rotor;

An electromagnetic drive means for driving the armature at the time of power transmission and connecting the armature to the mouth via a first friction surface against a biasing force applied to the armature;

A hub that rotates integrally with the armature,

A positive member that connects the armature and the hub and that is displaced when overloaded;

An engagement member that is supported movably in the radial direction by the tab and that frictionally engages a second friction surface of the rotor with displacement of the elastic member;

An electromagnetic coupling device comprising:

2. The elastic member is constituted by a damper rubber supported by a support pin fixed to the armature, and the engaging member is constituted by an engaging ring fitted on an outer peripheral surface of the damper rubber. 2. The electromagnetic coupling device according to claim 1, wherein:

3. The electromagnetic coupling device according to claim 1, further comprising bias means for urging the armature in a direction away from the mouth and the evening in a state where the armature and the hub are connected.

4. A hub whose pressing surfaces are provided at intervals in the rotation direction,

An armature coupled to the hub for axial movement and relative displacement in the rotational direction;

An elastic member that connects the armature and the armature;

A friction surface on which the armature is magnetically attracted;

A rotor having an annular engagement surface protruding in the axial direction from the friction surface and extending to a radially outer side of the pressing surface of the eight lobes;

The hub is provided between the engaging surface of the mouth and the pressing surface of the hub, and frictionally engages with the engaging surface of the mouth by the relative displacement of the hub and the armature in the rotational direction. An engagement member;

An excitation coil that stakes the armature on an elastic return force in the axial direction of the elastic member to generate a magnetic flux that is magnetically attracted to a friction surface of the rotor;

With

When the arm and the armature are relatively displaced in the rotation direction against the elastic return force of the elastic member in the rotation direction, the engagement member is pressed by the pressing surface of the arm and the armature is displaced. Electromagnetic coupling characterized by frictional engagement with a rotatable engagement surface

5. The electromagnetic coupling device according to claim 4, further comprising a locking portion provided on the engagement surface of the rotatable member, the locking portion having a surface on the front side in the rotation direction as a stopper surface.

6. The electromagnetic link according to claim 4, wherein the armature supports the engaging member.

7. The armature's anti-friction surface further includes a pair of parallel guide surfaces extending parallel to a straight line passing through the center of the hub and facing in the rotation direction, and an engaging member is provided between the pair of guide surfaces. 5. The device according to claim 4, wherein the device is interposed movably in a radial direction.

8. It further comprises: a support pin having a head, a torso, and a leg, and the leg is fixed to the armature; and a damper rubber fitted to the torso of the support pin, wherein the engaging member is formed of the damper rubber. 7. The electromagnetic coupling device according to claim 6, comprising an engagement ring fitted to the outer peripheral surface.

9. A non-magnetic guide member fixed to the anti-friction surface of the armature and provided with a pair of parallel guide surfaces extending parallel to a straight line passing through the center of the hub and facing in the rotation direction. 8. The electromagnetic coupling device according to claim 7, further comprising:

10. A plurality of flange portions extending in the radial direction at intervals in the rotation direction, a hub having a pressing surface formed on a surface on the rear side in the rotation direction of the flange portion, and an outer portion of the hub. A power transmission plate provided on the side,

A first elastic member connecting the power transmission plate to a flange portion of the hub; an armature provided on an inner side surface of the hub; and an armature connected to the power transmission plate; and a friction facing a friction surface of the armature. The hub projects axially from the surface A mouth having an annular engaging surface extending to the outside in the radial direction of the pressing surface of the power transmission plate; and an outer surface of the power transmission plate movably supported in a radial direction; A plurality of engaging members provided between the pressing surface and

An excitation coil for generating a magnetic flux for magnetically attracting the armature to the rotor,

When the hub and the armature are relatively displaced in the rotation direction, the engaging member is pressed by the pressing surface of the boss and frictionally engages with the engaging surface of the rotor. Electromagnetic coupling device.

11. The electromagnetic coupling device according to claim 10, further comprising: a locking portion provided on an engagement surface of the rotor and having a surface on a front side in the rotation direction as a stopper surface.

12. The armature is fixed to the power transmission plate and the support pin protrudes in the axial direction from the outer surface of the power transmission plate, and the second elastic member fitted to the outer peripheral surface of the support pin is further provided. 10. The engagement member according to claim 10, wherein the engagement member comprises an engagement ring for accommodating the second elastic member between an inner peripheral surface thereof and an outer peripheral surface of the support pin. Electromagnetic coupling device.

13. The power transmission plate is formed with a plurality of recesses formed as a pair of parallel guide surfaces extending in the direction of a straight line passing through the center of the hub, with walls facing each other in the rotation direction. 13. The electromagnetic coupling device according to claim 12, wherein the engagement ring is fitted so as to be movable in a radial direction.

1 4. A torso having a torso inserted into a through hole of the second elastic member, a head abutting on an outer surface of the second elastic member, and a leg having an armature fixed to the power transmission plate. A support pin, a cylindrical portion fitted to an outer peripheral surface of the second elastic member, and a flange portion interposed between an inner surface of the second elastic member and the recessed portion of the power transmission plate. 14. The electromagnetic link according to claim 13, further comprising an engagement ring having:

15. A bent portion bent in the axial direction is provided at an end on the radially inner side of the flange portion of the hub on the rear side in the rotational direction, and a surface on the rear side in the rotational direction of the bent portion is defined as a pressing surface. The electromagnetic coupling device according to claim 12, wherein:

16. A hub whose pressing surfaces are provided at intervals in the rotation direction, An armature connected to the arm to allow relative movement in the axial direction and the rotational direction;

A first elastic member for urging the armature in the anti-adsorption direction,

A friction surface on which the armature is magnetically attracted,

A support pin for fixing the armature to the guide member,

An engagement ring that is provided between an engagement surface of the rotor and a pressing surface of the eight-arm, and frictionally engages with the engagement surface of the rotor by a relative displacement in a rotational direction between the hub and the armature; When,

A second flexible member fitted between an inner peripheral surface of the engagement ring and an outer peripheral surface of the support pin;

An exciting coil that stakes the armature against the urging force of the first elastic member in the axial direction and generates a magnetic flux that is magnetically attracted to the friction surface of the rotor;

With

The engagement member is pressed by the pressing surface of the double boss by the relative displacement of the boss and the armature in the rotation direction against the elastic return force of the second elastic member in the rotation direction. Characterized by being frictionally engaged with an engagement surface of the rotor.

17. The electromagnetic coupling device according to claim 16, wherein the second elastic member is made of a damper rubber.