JP2006177502A - Electromagnetic clutch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase the span length of a leaf spring in an electromagnetic clutch having such a hub structure that a leaf spring member is joined to an armature through an elastic member formed of a rubber elastic material. <P>SOLUTION: The leaf spring 13e extending in the radial direction of a clutch is formed on the leaf spring member 13, the inner peripheral side 13a of the leaf spring member 13 is joined to a driven side device, and the outer peripheral side 13f of the leaf spring member 13 is integrally joined to the armature 5 through the elastic member 15. An interposing member 16 not adhered to the elastic member 15 is installed between the portion of the elastic member 15 facing the leaf spring 13e and the armature 5 so that the leaf spring 13e can be separated from the armature and elastically deformed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electromagnetic clutch that transmits and shuts off rotational power, and is suitable for use, for example, for intermittent operation of a compressor of a car air conditioner.

  Conventionally, in an electromagnetic clutch for a compressor of a car air conditioner, a rotor that is rotationally driven by a drive source such as an engine, an armature that is disposed opposite to the rotor with a predetermined minute gap, and this armature on the compressor side And a hub structure coupled to the rotating shaft.

  And as this hub structure, it has an inner hub (driven side rotation member) couple | bonded with the rotating shaft by the side of a compressor, and a leaf | plate spring member couple | bonded with this inner hub, This leaf | plate spring member consists of rubber | gum. A structure that is integrally coupled to an armature by an elastic member is known (see Patent Document 1).

In this prior art, a first type in which a plurality of leaf spring portions of a leaf spring member are formed so as to cross obliquely with respect to the clutch circumferential direction, and a plurality of leaf spring members are formed in a disc spring shape. And a second type formed so that the leaf spring portion of the plate spring portion extends in the clutch radial direction.
JP 2000-161389 A

  By the way, the leaf spring member of the electromagnetic clutch is generally designed on the assumption that a tensile force acts on the leaf spring portion in order to ensure a durable life. However, in the first type of the above prior art, the leaf spring portion of the leaf spring member is formed so as to cross obliquely with respect to the clutch circumferential direction. A force acts, and a compressive force acts on the leaf spring portion when the rotor rotates in the other direction.

  As a result, the use rotation direction of the electromagnetic clutch is limited to only one direction in which a tensile force is applied to the leaf spring portion. Therefore, it becomes necessary to manufacture two types of electromagnetic clutches in which the oblique direction of the leaf spring portion is reversed in accordance with the use rotation direction of the applicable vehicle type, resulting in an increase in cost.

  In the second type of the prior art, the elastic member made of rubber is bonded to the leaf spring portion of the leaf spring member, and the elastic deformation of the leaf spring portion is restricted. The length (the length of the portion that is elastically deformed as a leaf spring) becomes small.

  As a result, the spring constant of the leaf spring member is increased, the stress of the leaf spring member is increased, and the durability of the leaf spring member is adversely affected and the armature suction force is increased.

  Further, since the span length of the leaf spring portion is small, the amount of strain in the pulling direction (clutch axial direction) of the elastic member made of rubber increases, and the durability of the elastic member is lowered.

  In view of the above points, the present invention provides an electromagnetic clutch having a hub structure in which a leaf spring member is integrally coupled to an armature by an elastic member made of a rubber-based elastic material. It is intended to improve the durability of the leaf spring member and the elastic member.

In order to achieve the above object, according to the invention described in claim 1, an armature (5) attracted to the drive side rotating member (4) by the electromagnetic force generated by the electromagnetic coil (3)
A leaf spring member (13) that generates a spring force in a direction to separate the armature (5) from the drive side rotation member (4);
A plate-like elastic member (15) made of a rubber-based elastic material, disposed between the armature (5) and the leaf spring member (13);
The leaf spring member (13) has a leaf spring portion (13e) extending in the clutch radial direction,
An inner peripheral side portion (13a) of the leaf spring portion (13e) of the leaf spring member (13) is integrally coupled to a driven device, and the leaf spring portion (13e) of the leaf spring member (13). The outer peripheral side portion (13f) of the armature is integrally coupled to the armature (5) by the elastic member (15),
Further, a portion (16, 17, 18) between the armature (5) and the leaf spring portion (13e) that allows the leaf spring portion (13e) to be elastically deformed away from the armature (5). It is characterized by providing.

  According to this, since the leaf | plate spring part (13e) of a leaf | plate spring member (13) can leave | separate from an armature (5) and can be elastically deformed, the full length of a leaf | plate spring part (13e) can be set as span length which can be elastically deformed. As a result, the spring constant of the leaf spring member (13) can be reduced to reduce the attractive force of the armature (5), and the stress of the leaf spring member (13) can be reduced to improve the durability of the leaf spring member (13). Can be improved.

  Further, even if the leaf spring portion (13e) is elastically deformed with the displacement of the armature (5), the deformation of the elastic member (15) of the leaf spring portion (13e) can be suppressed to a small amount. The amount of strain of the elastic member (15) accompanying the displacement of 5) can be reduced, and the durability of the elastic member (15) can also be improved.

  And since the leaf | plate spring part (13e) of a leaf | plate spring member (13) is a shape extended in a clutch radial direction, the leaf | plate spring of a leaf | plate spring member (13) is irrespective of which direction of an electromagnetic clutch rotation is forward or reverse. The state of stress generation at the part (13e) is the same. For this reason, the rotation direction of the electromagnetic clutch can be set to either forward or reverse depending on the use rotation direction to be applied, which is practically useful.

In the invention according to claim 2, the armature (5) attracted to the drive side rotating member (4) by the electromagnetic force generated by the electromagnetic coil (3);
An inner hub (11) coupled to the driven device;
An inner peripheral annular portion (13a), an outer peripheral annular portion (13f), and both annular portions (13a, 13b) extending in the radial direction between the inner peripheral annular portion (13a) and the outer peripheral annular portion (13f). A leaf spring member (13) having a plurality of leaf spring portions (13e) that integrally couple
A plate-like elastic member (15) made of a rubber-based elastic material, disposed between the armature (5) and the leaf spring member (13);
The inner peripheral annular portion (13a) is integrally coupled to the inner hub (11), and the outer peripheral annular portion (13f) is integrally coupled to the armature (5) by the elastic member (15),
The leaf spring portion (13e) generates a spring force in a direction to separate the armature (5) from the drive side rotation member (4).
Further, a portion (16, 17, 18) between the armature (5) and the leaf spring portion (13e) that allows the leaf spring portion (13e) to be elastically deformed away from the armature (5). It is characterized by providing.

  The invention according to claim 2 specifies that the leaf spring member (13) has a double annular shape in the radial direction with respect to claim 1, and is a plate having this double annular shape. In the electromagnetic clutch using the spring member (13), the same effect as that of the first aspect can be exhibited.

  As in the invention described in claim 3, in the electromagnetic clutch according to claim 1 or 2, specifically, the elastic member (15) is connected to the armature (5) and the leaf spring member (13). On the other hand, it is integrally formed.

  According to a fourth aspect of the present invention, in the electromagnetic clutch according to any one of the first to third aspects, the leaf spring portion (13e) can be elastically deformed away from the armature (5). Specifically, the portion can be constituted by an interposition member (16) that is not bonded to the elastic member (15).

  As in the invention according to claim 5, in the electromagnetic clutch according to any one of claims 1 to 3, the leaf spring portion (13e) is allowed to elastically deform away from the armature (5). The portion may be formed by a portion (17) that is formed on the surface of the armature (5) or the surface of the leaf spring portion (13e) and is not bonded to the elastic member (15).

As in the invention described in claim 6, in the electromagnetic clutch according to any one of claims 1 to 3, the leaf spring portion between the armature (5) and the leaf spring portion (13e). (13e) is provided with a space (18) in which the elastic member (15) is not disposed,
A portion that allows the leaf spring portion (13e) to be elastically deformed away from the armature (5) may be constituted by the space portion (18).

  In addition, the code | symbol in the bracket | parenthesis of each said means shows the correspondence with the specific means as described in embodiment mentioned later.

(First embodiment)
1-6 is 1st Embodiment, FIG. 1 is sectional drawing of the electromagnetic clutch with which the refrigerant | coolant compressor of the refrigeration cycle for vehicle air conditioning is mounted | worn, and is AA sectional drawing of FIG. 2 is a front view from the left side of FIG. 1, and FIG. 3 is a cross-sectional view taken along the line BB of FIG. 4 is a front view of the plate spring member 13 alone, FIG. 5 is a front view of the electromagnetic clutch showing the adhesion range of the elastic member 15 by a hatched portion, and FIG. 6 is a front view of the resin interposed member 16 alone.

  The electromagnetic clutch 1 is attracted to the rotor 4 by an electromagnetic coil 3 housed in the stator 2, a rotor 4 that forms a driving side rotating member that is rotationally driven by a vehicle engine (not shown), and an electromagnetic force generated by the electromagnetic coil 3. And a hub 6 that is coupled to the armature 5 and that forms a driven side rotating member that rotates together with the armature 5.

  The hub 6 is coupled to a rotating shaft of a refrigerant compressor (not shown) and transmits rotational power to the refrigerant compressor. The refrigerant compressor is a driven device of this embodiment.

  The stator 2, the rotor 4, and the armature 5 are formed of an iron-based magnetic material and constitute a magnetic circuit for magnetic flux generated by the electromagnetic coil 3. The stator 2 is formed in a U-shaped cross section, and the electromagnetic coil 3 is accommodated in the inner space.

  Specifically, the electromagnetic coil 3 is wound around a spool 7, and is electrically fixed to the inner space of the stator 2 together with the spool 7 by an insulating resin member 8 such as epoxy and is fixed by molding. The stator 2 is fixed to a housing of a refrigerant compressor (not shown) via a ring-shaped support member 9.

  The rotor 4 has a pulley 4a around which a multi-stage V-belt (not shown) is stretched, and is rotated by the rotational power of the engine transmitted through the V-belt. The rotor 4 is formed in a U-shaped cross section that accommodates the stator 2 with a minute gap therebetween. The rotor 4 includes a bearing 10 on the inner periphery thereof, and the rotor 4 is rotatably supported by the bearing 10 on an outer peripheral surface of a cylindrical boss portion of a housing of a refrigerant compressor (not shown).

  The armature 5 is formed in a ring-like disk shape, and is disposed opposite to the friction surface 4b of the rotor 4 with a predetermined minute gap (for example, about 0.5 mm). In addition, the armature 5 of this example has a magnetic shielding groove 5a formed in the intermediate portion in the radial direction. A plurality of (for example, four) groove portions 5a are formed in an arc shape that is elongated in the circumferential direction of the armature 5.

  Therefore, as shown in the upper half of FIG. 1, the ring shape of the armature 5 includes an outer peripheral portion 5b positioned on the outer peripheral side of the magnetic blocking groove portion 5a and an inner peripheral portion 5c positioned on the inner peripheral side of the magnetic blocking groove portion 5a. It is divided into and. The lower half of FIG. 1 shows a cross-sectional shape at a position between the plurality of magnetic shielding grooves 5ab (inner and outer integrated coupling portions).

  Next, the details of the hub 6 constituting the main part of the present invention will be described. The hub 6 is formed of a ferrous metal in a cylindrical shape, and the inner peripheral surface of the inner hub 11 is spline-fitted. A portion 11a is formed, and a compressor rotation shaft (not shown) is prevented from rotating by the spline fitting portion 11a and is integrally coupled.

  Further, the inner hub 11 is integrally formed with a mounting flange portion 11b extending radially outward from one end portion (outer end portion) in the axial direction of the cylindrical portion. The mounting flange portion 11b has an annular plate shape, and the circular outer peripheral shape of the mounting flange portion 11b is shown in FIG.

  A leaf spring member 13 is integrally fixed to the mounting flange portion 11b by a rivet 12. However, the leaf spring member 13 is fixed by the rivet 12 after the later-described elastic member forming step for the armature 5 and the leaf spring member 13 is completed.

  The leaf spring member 13 is formed of a ferrous metal spring material into a substantially circular plate shape shown in FIG. The substantially circular plate shape is a double annular shape having an inner peripheral annular portion 13a and an outer peripheral annular portion 13f that are open at the center.

  A plurality (three in this example) of mounting holes 13b are formed in the inner circumferential annular portion 13a of the leaf spring member 13 at equal intervals in the circumferential direction. The mounting holes 13b and the central hole of the metal washer 14 (FIG. 1) The inner peripheral annular portion 13a of the leaf spring member 13 is integrally fixed to the mounting flange portion 11b through the rivet 12 via the metal washer 14.

  A plurality of opening windows 13c are formed between the radial portions of the leaf spring member 13, that is, between the inner peripheral annular portion 13a and the outer peripheral annular portion 13f. In this example, the opening windows 13c are formed at three equal intervals in the circumferential direction of the leaf spring member 13. The opening window 13c has an arcuate shape extending in the circumferential direction, and a protrusion 13d is formed at the center of the inner periphery of the opening window 13c. The protrusion 13c protrudes outward in the radial direction from the inner periphery of the opening window portion 13c with a smooth curved surface.

  And the leaf | plate spring part 13e with a narrow width | variety extended in radial direction between the three opening window parts 13c among the leaf | plate spring members 13 is formed. Therefore, in this example, the leaf spring portions 13e are formed at three equal intervals in the circumferential direction of the leaf spring member 13. By these three plate spring portions 13e, the inner peripheral annular portion 13a and the outer peripheral annular portion 13f are integrally coupled.

  Next, a plate-like elastic member 15 is interposed between the leaf spring member 13 and the armature 5. The elastic member 15 integrally connects the outer peripheral annular portion 13 f of the leaf spring member 13 and the outer peripheral portion 5 b of the armature 5.

  The elastic member 15 is a rubber-based elastic material that performs a torque transmission function between the leaf spring member 13 and the armature 5 and also performs a vibration damping function. Here, the rubber material used for the elastic member 15 has excellent characteristics in terms of torque transmission and torque fluctuation absorption (vibration damping) with respect to a wide range of changes in the operating environment temperature of the vehicle (−30 ° C. to 120 ° C.). What exhibits is preferable, for example, chlorinated butyl rubber is preferable. In addition, acrylonitrile butadiene rubber, ethylene propylene rubber, or the like may be used for the elastic member 15.

  The elastic member 15 is bonded not only between the leaf spring member 13 and the armature 5 but also on the outer surface of the leaf spring member 13 (the left side surface in FIG. 1) and the outer peripheral end surface of the armature 5. The outer surface of 13 and the outer peripheral end surface of the armature 5 are almost entirely covered with the elastic member 15.

  Thereby, the vibration suppression effect of the armature 5 and the leaf spring member 13 when the armature 5 is attracted to the rotor 4 can be enhanced. 5 indicates the adhesion range of the elastic member 15, and the outer surface of the leaf spring member 13 is almost entirely covered by the elastic member 15.

  In the leaf spring member 13, an exposed portion 13g (FIGS. 1 and 3) of the leaf spring member 13 is provided in a minute range near the outer peripheral end portion. The exposed portion 13g is a portion that directly supports the vicinity of the outer peripheral end portion of the leaf spring member 13 by a molding die in a molding process of the elastic member 15 described later. The direct support by the molding die allows the leaf spring member 13 to be directly supported. Maintain regular shape stably.

  Also, the plurality of openings 13h and 13i provided in the outer peripheral annular portion 13f of the leaf spring member 13 are all plate spring members from the outside (left side in FIG. 1) of the leaf spring member 13 in the molding process. It is for making it easy to wrap around inside 13 (right side of FIG. 1). The plurality of circular recesses 15a in the vicinity of the outer peripheral end of the elastic member 15 are formed by injection gates provided in the molding die, and the molten rubber material is injected from the plurality of circular recesses 15a. .

  On the other hand, between the portion of the elastic member 15 that is bonded to the leaf spring portion 13e and the armature 5, an interposition member 16 that prevents the bonding between the two is disposed. The overall shape of the interposition member 16 is a substantially annular plate member as shown in FIG. This interposition member 16 has an annular shape extending in the circumferential direction in the portion of the leaf spring member 13 where the opening window portion 13c and the leaf spring portion 13e are formed. Therefore, the interposition member 16 is disposed to face the inner peripheral portion 5c of the armature 5 as shown in the upper half of FIG.

  The interposition member 16 is formed of a material that does not adhere to the rubber material of the elastic member 15, specifically, a resin. In this example, a polyamide resin (nylon 66) excellent in mechanical strength, heat resistance, etc. is used as the material of the interposition member 16. This polyamide resin (nylon 66) has a heat resistance temperature sufficiently higher than the molding temperature of the chlorinated butyl rubber used as the elastic member 15 (temperature of the molten rubber).

  Protrusions 16a and 16b (FIGS. 1 and 3) are formed on the outer peripheral portion and the inner peripheral portion of the interposed member 16, respectively. Then, the interposing member 16 can be assembled to the armature 5 by fitting the outer peripheral projection 16 a to the magnetic shielding groove 5 a of the armature 5 and fitting the inner peripheral projection 16 b to the inner peripheral end surface of the armature 5. it can.

  Further, an opening window portion 16c (FIG. 3) is formed corresponding to a partial region of the opening window portion 13c of the leaf spring member 13 in the interposition member 16, and the elastic member 15 is formed in the opening window portion 16c. The armature 5 is directly bonded onto the inner peripheral portion 5c.

  Of the elastic member 15, the fan-shaped protrusion 15 b (FIGS. 2 and 3) located in the opening window portion 13 c of the leaf spring member 13 presses the interposition member 16 toward the armature 5, and the interposition member 16 is pressed against the armature 5. It plays a role to fix.

  The opening 15c located at the center of the fan-shaped protrusion 15a is for forming an exposed portion 5d that is directly supported by a molding die on the surface of the armature 5 on the elastic member 15 side.

  Next, a method for integrally forming the elastic member 15 with respect to the armature 5 and the leaf spring member 13 will be described. First, an adhesive is applied as a pretreatment to a portion of the armature 5 and the leaf spring member 13 where the elastic member 15 is bonded.

  Next, the protrusions 16a and 16b of the interposition member 16 are fitted into the magnetic shielding groove 5a and the inner peripheral end surface of the armature 5 as shown in FIGS. 1 and 3, and the interposition member 16 is assembled to the armature 5.

  Next, the armature 5 with the interposition member 16 and the leaf spring member 13 are set in a molding die of the elastic member 15. Here, the armature 5 can be directly supported and positioned by the inner surface of the molding die at the surface of the rotor 4 and the exposed portion 5d.

  The leaf spring member 13 has exposed portions (see the lower half of FIG. 1) near the mounting hole 13b on the inner peripheral side, so that both the front and back surfaces near the mounting hole 13b and the outer peripheral end portion are exposed. The portion 13g can be directly supported by the inner surface of the molding die and positioned.

  Here, as shown in FIG. 1, the leaf spring member 13 is molded in a state where the leaf spring portion 13e is elastically bent and deformed so that the outer peripheral portion is located on the armature 5 side as compared with the inner peripheral portion thereof. Set inside.

  For this reason, the distance (interval) between the inner peripheral portion of the leaf spring member 13 and the armature 5 is larger than the distance (interval) between the outer peripheral portion (outer peripheral annular portion 13 f) of the leaf spring member 13 and the armature 5. . Along with this, a predetermined step is generated between the protrusion 13d and the outer peripheral annular portion 13f which are opposed to each other in the radial direction through the opening window portion 13c in the leaf spring member 13.

  Next, the molten rubber material constituting the elastic member 15 is injected from the injection gate of the molding die into the inner space of the die to mold the elastic member 15. The elastic member 15 is molded by vulcanization, and the elastic member 15 is vulcanized and bonded to the surface of the leaf spring member 13 and the surface of the armature 5 which are iron-based metal materials at the same time as the molding.

  Here, since the interposed member 16 is formed of a resin material that is not bonded to the rubber material of the elastic member 15, the elastic member 15 is not bonded to the interposed member 16. Since the inner peripheral portion 5 c of the armature 5 is covered with the interposed member 16, the elastic member 15 is bonded only to the outer peripheral portion 5 b of the armature 5.

  Accordingly, only the outer peripheral annular portion 13 f of the leaf spring member 13 is integrally coupled to the outer peripheral portion 5 b of the armature 5 by the elastic member 15.

  Since the interposed member 16 also serves to define the molding range of the elastic member 15, the use of the interposed member 16 can simplify the shape of the molding die, thereby reducing the manufacturing cost of the molding die.

  By the way, when the molding structure including the armature 5, the leaf spring member 13, the elastic member 15, and the interposition member 16 is taken out from the molding die after the molding of the elastic member 15, the leaf spring member 13 is bent and deformed by the molding die. Therefore, the outer peripheral annular portion 13f of the leaf spring member 13 tries to return to the position before the bending deformation, but the elastic member 15 in the inner portion of the projection 13d is displaced by the displacement of the outer peripheral annular portion 13f. Is compressed, the return of the outer peripheral annular portion 13f is suppressed by the elastic member 15 inside the protrusion 13d. As a result, the armature 5 can be displaced toward the rotor 4 by a predetermined distance, and an initial reaction force can be generated in the leaf spring portion 13 e of the leaf spring member 13.

  Next, the operation of the first embodiment in the above configuration will be described. When the energization of the electromagnetic coil 3 is stopped (clutch off), the armature 5 is rotated by the spring force generated in the leaf spring portion 13e of the leaf spring member 13. 4 is held at a position spaced apart from the friction surface 4b by a predetermined distance.

  For this reason, rotational power from a vehicle engine (not shown) is only transmitted to the rotor 4 via the V-belt, but not transmitted to the armature 5 and the hub 6, and only the rotor 4 is idled on the bearing 10. Therefore, the refrigerant compressor of the driven device is stopped.

  On the other hand, when the electromagnetic coil 3 is energized, the armature 5 is attracted to the rotor 4 against the spring force of the leaf spring portion 13e of the leaf spring member 13 by the electromagnetic force generated by the electromagnetic coil 3, and the armature 5 is Adsorbed to the rotor 4. Then, the rotation of the rotor 4 is transmitted to the rotation shaft of the refrigerant compressor via the armature 5, the elastic member 15, the leaf spring member 13, and the inner hub 11, and the refrigerant compressor is activated.

  When the energization of the electromagnetic coil 3 is interrupted, the armature 5 returns to the original open position by the spring force of the leaf spring portion 13e of the leaf spring member 13 due to the disappearance of the electromagnetic force, and the refrigerant compressor is stopped. Return to.

  The elastic member 15 made of a rubber-based elastic material is interposed between the armature 5 and the leaf spring member 13, and the outer surface of the leaf spring member 13 is almost entirely covered with the elastic member 15. When the clutch is on, the impact and vibration when the armature 5 is attracted to the friction surface of the rotor 4 can be mitigated by the vibration damping action of the elastic member 15.

  Similarly, torsional resonance caused by fluctuations in the driving torque of the compressor 7 can be mitigated by the vibration damping action of the elastic member 15. The vibration damping action of these elastic members 15 can effectively reduce the operating noise of the electromagnetic clutch 1 and the refrigerant compressor.

  By the way, since the resin-made interposition member 16 is disposed at a portion of the elastic member 15 that is bonded to the leaf spring portion 13 e of the plate spring member 13, and this interposition member 16 is not bonded to the elastic member 15, the interposition member 16. Is fixed to the armature 5, the leaf spring portion 13 e of the leaf spring member 13 can be freely elastically deformed without being restrained by the armature 5.

  As a result, the leaf spring portion 13e of the leaf spring member 13 can use the entire length L (FIG. 4) of the spring-shaped portion as a span length that can be elastically deformed.

  As a result, the spring constant of the leaf spring portion 13e of the leaf spring member 13 can be reduced to reduce the attractive force of the armature 5, and at the same time, the stress generated in the leaf spring member 13 can be reduced, and the durability of the leaf spring member 13 can be reduced. Can be improved.

  Further, since the elastic member 15 bonded to the plate spring portion 13e is not bonded to the interposition member 16, even if the plate spring portion 13e is elastically deformed as the armature 5 is displaced, the plate spring portion 13e. The distortion of the elastic member 15 can be suppressed to a small amount. Therefore, the amount of distortion of the elastic member 15 accompanying the displacement of the armature 5 can be reduced, and the durability of the elastic member 15 can be improved.

(Second Embodiment)
In 1st Embodiment, although the resin-made interposition members 16 are arrange | positioned in the part adhere | attached with the leaf | plate spring part 13e of the leaf | plate spring member 13 among the elastic members 15, in 2nd Embodiment, this resin-made The interposition member 16 is abolished and the same effect as the first embodiment is exhibited.

  FIG. 7 shows a hub 6 portion according to the second embodiment. In the armature 5, the surface of the inner peripheral portion 5 c facing the leaf spring portion 13 e of the leaf spring member 13 is not bonded to the elastic member 15. Thus, a portion 17 where the elastic member 15 and the inner peripheral portion 5c of the armature 5 can be separated is provided at a portion of the leaf spring member 13 facing the leaf spring portion 13e.

  Here, as a specific example of the configuration in which the surface of the inner peripheral portion 5c of the armature 5 is not bonded to the elastic member 15, a surface treatment that prevents the elastic member 15 from adhering to the surface of the inner peripheral portion 5c, for example, a fluororesin A means of forming a surface coating such as (Teflon (registered trademark)) can be employed.

  As another specific example, the adhesive may not be applied to the surface of the inner peripheral portion 5c of the armature 5 to prevent the elastic member 15 from adhering to the surface of the inner peripheral portion 5c.

  Thereby, also in 2nd Embodiment, the span length L of the leaf | plate spring part 13e can be set to the length equivalent to 1st Embodiment.

  In FIG. 7, the surface of the inner peripheral portion 5 c of the armature 5 is configured not to be bonded to the elastic member 15, but the surface of the leaf spring portion 13 e of the leaf spring member 13 is not bonded to the elastic member 15. It may be configured. Even in this case, the span length L of the leaf spring portion 13e can be similarly secured.

  Of course, both the leaf spring portion 13e of the leaf spring member 13 and the elastic member 15 and the inner peripheral portion 5c of the armature 5 and the elastic member 15 may be non-adhered.

(Third embodiment)
FIG. 8 shows the hub 6 portion according to the third embodiment, and a space portion 18 in which the elastic member 15 is not disposed is provided at a portion facing the leaf spring portion 13 e between the leaf spring member 13 and the armature 5. .

  According to this, free elastic deformation of the leaf spring portion 13e is ensured by the space portion 18, and the span length L of the leaf spring portion 13e can be ensured similarly to the first and second embodiments.

(Other embodiments)
In the first embodiment, the interposed member 16 is made of resin and is not bonded to the elastic member 15 made of a rubber-based elastic material. However, the interposed member 16 is made of metal and is not bonded to the elastic member 15 on the metal surface. You may make it perform the surface treatment which becomes.

FIG. 3 is a longitudinal sectional view of the electromagnetic clutch according to the first embodiment of the present invention, and is a sectional view taken along line AA in FIG. 2. It is a front view of the electromagnetic clutch of FIG. It is BB sectional drawing of FIG. It is a front view of the leaf | plate spring member single-piece | unit with which the hub by 1st Embodiment is equipped. It is a front view of the electromagnetic clutch which shows the adhesion range of the elastic member by 1st Embodiment. It is a front view of the resin intervention member simple substance with which the hub by a 1st embodiment is equipped. It is a longitudinal cross-sectional view of the hub by 2nd Embodiment. It is a longitudinal cross-sectional view of the hub by 3rd Embodiment.

Explanation of symbols

3 ... Electromagnetic coil, 4 ... Rotor (drive side rotating member), 5 ... Armature,
DESCRIPTION OF SYMBOLS 13 ... Plate spring member, 13e ... Plate spring part, 15 ... Elastic member, 16 ... Interposition member.

Claims (6)

An electromagnetic coil (3) that generates electromagnetic force when energized;
A drive-side rotating member (4) that is rotated by a drive source;
An armature (5) that is attracted to the driving side rotating member (4) by the electromagnetic force generated by the electromagnetic coil (3) and receives the rotation of the driving side rotating member (4);
A leaf spring member (13) that generates a spring force in a direction to separate the armature (5) from the drive side rotation member (4);
A plate-like elastic member (15) made of a rubber-based elastic material, disposed between the armature (5) and the leaf spring member (13);
The leaf spring member (13) has a leaf spring portion (13e) extending in the clutch radial direction,
An inner peripheral side portion (13a) of the leaf spring portion (13e) of the leaf spring member (13) is integrally coupled to a driven device, and the leaf spring portion (13e) of the leaf spring member (13). The outer peripheral side portion (13f) of the armature is integrally coupled to the armature (5) by the elastic member (15),
Further, a portion (16, 17, 18) between the armature (5) and the leaf spring portion (13e) that allows the leaf spring portion (13e) to be elastically deformed away from the armature (5). The electromagnetic clutch characterized by providing. An electromagnetic coil (3) that generates electromagnetic force when energized;
A drive-side rotating member (4) that is rotated by a drive source;
An armature (5) that is attracted to the driving side rotating member (4) by the electromagnetic force generated by the electromagnetic coil (3) and receives the rotation of the driving side rotating member (4);
An inner hub (11) coupled to the driven device;
An inner peripheral annular portion (13a), an outer peripheral annular portion (13f), and both annular portions (13a, 13b) extending in the radial direction between the inner peripheral annular portion (13a) and the outer peripheral annular portion (13f). A leaf spring member (13) having a plurality of leaf spring portions (13e) that integrally couple
A plate-like elastic member (15) made of a rubber-based elastic material, disposed between the armature (5) and the leaf spring member (13);
The inner peripheral annular portion (13a) is integrally coupled to the inner hub (11), and the outer peripheral annular portion (13f) is integrally coupled to the armature (5) by the elastic member (15),
The leaf spring portion (13e) generates a spring force in a direction to separate the armature (5) from the drive side rotation member (4).
Further, a portion (16, 17, 18) between the armature (5) and the leaf spring portion (13e) that allows the leaf spring portion (13e) to be elastically deformed away from the armature (5). The electromagnetic clutch characterized by providing. The electromagnetic clutch according to claim 1 or 2, wherein the elastic member (15) is integrally formed with the armature (5) and the leaf spring member (13). A portion that allows the leaf spring portion (13e) to be elastically deformed away from the armature (5) is constituted by an interposed member (16) that is non-adhered to the elastic member (15). The electromagnetic clutch according to any one of claims 1 to 3. A portion for allowing the leaf spring portion (13e) to be elastically deformed away from the armature (5) is formed on the surface of the armature (5) or the surface of the leaf spring portion (13e), and the elastic member ( The electromagnetic clutch according to any one of claims 1 to 3, wherein the electromagnetic clutch is constituted by a part (17) that is non-adhering to 15). Between the armature (5) and the leaf spring portion (13e), a space portion (18) where the elastic member (15) is not disposed is provided at a portion facing the leaf spring portion (13e),
The part which enables the said leaf | plate spring part (13e) to leave | separate from the said armature (5) and to elastically deform is comprised by the said space part (18), The one of Claim 1 thru | or 3 characterized by the above-mentioned. The electromagnetic clutch as described in.

Images