JP2014142053A - Electromagnetic clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability of an elastic member arranged between a cylinder part of an outer hub and a cylinder part of an inner hub.SOLUTION: Plural outer hub outer peripheral protrusion parts 411 projecting on an outer peripheral side are provided on an outer hub cylinder part 41 in a circumferential direction, and portions 42a of the outer hub 4 coupled to an armature 3 are provided between the adjacent outer hub outer peripheral protrusion parts 411. Thereby, a physique of an elastic member 7 gets larger than conventional, and stress of the elastic member 7 generated together with elastic deformation during absorbing torque variation gets small, so as to improve durability of the elastic member 7.

Description

  The present invention relates to an electromagnetic clutch that transmits and interrupts power.

  A conventional electromagnetic clutch couples a rotor that is rotationally driven by a drive source such as an engine, an armature that is opposed to the rotor with a predetermined minute gap, and this armature to a rotary shaft on the compressor side. And a hub structure.

  As the hub structure, a structure in which a rubber elastic member is disposed between a cylindrical portion of the outer hub coupled to the armature and a cylindrical portion of the inner hub coupled to the rotating shaft on the compressor side is known. (See Patent Document 1). Further, the outer hub includes a mounting plate portion extending from one end side of the cylindrical portion toward the outer peripheral side, and the mounting plate portion and the armature are coupled by a rivet.

JP-A-6-74258

  One of the functions of the elastic member is to absorb torque fluctuation, and the elastic member has a larger physique, that is, a larger diameter is more excellent in durability.

  However, in the conventional electromagnetic clutch, since the mounting plate portion is disposed on the outer peripheral side of the outer hub cylindrical portion, the outer diameter of the outer hub cylindrical portion cannot be sufficiently increased, and as a result, the outer diameter of the elastic member is increased. There is a possibility that the elastic member cannot be sufficiently large and the durability of the elastic member is insufficient.

  The present invention has been made in view of the above points, and an object thereof is to improve the durability of an elastic member disposed between a cylindrical portion of an outer hub and a cylindrical portion of an inner hub.

  In order to achieve the above object, according to the first aspect of the present invention, the driving side rotating body (2) rotated by a driving source and the driving side rotating body are rotated by being attracted to the driving side rotating body side by electromagnetic force. A receiving armature (3), a cylindrical outer hub cylinder portion (41) extending in the direction of the rotation axis, an outer hub (4) coupled to the armature, and an inner hub side of the outer hub cylinder portion arranged in the rotation axis direction And an inner hub (5, 6) coupled to the driven device and a rubber-based elastic material, and disposed between the outer hub cylinder and the inner hub cylinder. And an elastic member (7) for transmitting a driving force from the outer hub cylinder part to the inner hub cylinder part, and the outer hub cylinder part has a plurality of outer hub outer protrusions (411) protruding outward in the circumferential direction. Is the binding site (42a) of the armature in the outer hub, characterized in that located between the outer hub outer peripheral protruding portion adjacent when viewed along the outer hub in the rotational axis direction.

  According to this, since the outer diameter of the elastic member can be made larger than that of the conventional one on both sides in the circumferential direction of the coupling site, the size of the elastic member becomes larger, and consequently the elasticity that occurs due to elastic deformation when absorbing torque fluctuations The stress of the member is reduced, and the durability of the elastic member is improved.

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

It is front sectional drawing of the electromagnetic clutch which concerns on one Embodiment of this invention. FIG. 2 is a left side view of the outer hub of FIG. 1. FIG. 3 is a cross-sectional view taken along line A-O-A in FIG. 2. FIG. 3 is a sectional view taken along line B-O in FIG. 2. It is a left view of the inner hub of FIG. It is CC sectional drawing of FIG. FIG. 2 is a left side view of the armature, outer hub, inner hub, and elastic member of FIG. 1. It is DOD sectional drawing of FIG. It is EO sectional drawing of FIG. It is a left side view of an armature, an outer hub, an inner hub, and an elastic member which show the 1st modification of one embodiment. It is a left side view of an armature, an outer hub, an inner hub, and an elastic member which show the 2nd modification of one embodiment. It is a left view of the armature, outer hub, inner hub, and elastic member which show the 3rd modification of one Embodiment. It is a left side view of an armature, an outer hub, an inner hub, and an elastic member which shows the 4th modification of one embodiment.

  An embodiment of the present invention will be described. The electromagnetic clutch according to the present embodiment is used in a vehicle air conditioner to intermittently transmit a rotational driving force output from a vehicle driving engine as a drive source to a refrigerant compressor as a driven device. It is done.

  As shown in FIG. 1, the electromagnetic clutch includes an electromagnet 1, a rotor 2, an armature 3, an outer hub 4, an inner hub first member 5, an inner hub second member 6, an elastic member 7, and the like, and rotates about a rotation axis J. To do.

  The electromagnet 1 includes a stator 11 and a coil 12 and the like. When the coil 12 is energized, an electromagnetic force is generated to connect the rotor 2 and the armature 3.

  The stator 11 is made of a magnetic material (specifically, iron). The coil 12 is fixed to the stator 11 while being molded with an insulating resin material (specifically, nylon), and is electrically insulated from the stator 11.

  The rotor 2 as a driving side rotating body includes a rotor inner cylindrical portion 21, a rotor intermediate cylindrical portion 22 positioned on the outer peripheral side of the rotor inner cylindrical portion 21, and a rotor outer cylindrical portion positioned on the outer peripheral side of the rotor intermediate cylindrical portion 22. 23. These cylindrical portions 21, 22, and 23 have a cylindrical shape extending in the direction of the rotation axis J, and are arranged concentrically around the rotation axis J.

  The rotor 2 extends in a direction perpendicular to the rotation axis so as to connect one end sides of the rotor inner cylindrical portion 21 and the rotor intermediate cylindrical portion 22 in the rotation axis J direction, and has a circular through hole penetrating the front and back at the center portion. The disk-shaped rotor end surface portion 24 is formed.

  A cylindrical space is formed by the rotor inner cylindrical portion 21, the rotor intermediate cylindrical portion 22, and the rotor end surface portion 24, and the electromagnet 1 is accommodated in the cylindrical space.

  A V groove (specifically, a poly V groove) on which a V belt (not shown) is hung is formed on the outer peripheral surface of the rotor outer cylindrical portion 23. The V belt transmits the rotational driving force output from the engine to the rotor 2.

  The rotor inner cylindrical portion 21, the rotor intermediate cylindrical portion 22, the rotor outer cylindrical portion 23, and the rotor end surface portion 24 are made of a magnetic material (specifically, low carbon steel), and the rotor inner cylindrical portion 21, the rotor intermediate cylindrical portion. 22 and the rotor end surface portion 24 constitute a magnetic circuit of electromagnetic force generated by the electromagnet 1.

  A rotor friction surface 241 that contacts the armature 3 when the rotor 2 and the armature 3 are connected is formed on the armature 3 side of the rotor end surface portion 24. A friction plate 25 for increasing the coefficient of friction with the armature 3 is attached to the rotor friction surface 241. The friction plate 25 has a disk shape in which a circular through hole penetrating the front and back surfaces is formed in the center portion.

  The outer peripheral side of the ball bearing 26 is fixed to the inner peripheral side of the rotor inner cylindrical portion 21, and the inner side of the ball bearing 26 is connected to the electromagnetic clutch side from the housing that forms the outer shell of the refrigerant compressor (not shown). A cylindrical boss portion (not shown) protruding to the side is fixed. Thereby, the rotor 2 is rotatably fixed with respect to the housing of a refrigerant compressor.

  The armature 3 is a disk-shaped member that extends in the direction perpendicular to the rotation axis and is formed with a circular through hole penetrating the front and back at the center. The armature 3 is formed of a magnetic material (specifically, low carbon steel) and constitutes a magnetic circuit of electromagnetic force generated by the electromagnet 1.

  An armature friction surface 31 that contacts the rotor friction surface 241 when the rotor 2 and the armature 3 are connected is formed on the rotor 2 side of the armature 3. The armature 3 is attracted to the rotor 2 side by the electromagnetic force of the electromagnet 1 and receives the rotation of the rotor 2.

  A plurality of columnar armature protrusions 32 for coupling the outer hub 4 are formed on the side of the armature 3 opposite to the rotor.

  As shown in FIGS. 1 to 4, the outer hub 4 is formed by press-molding a metal plate material, and includes a cylindrical outer hub cylinder portion 41 extending in the rotation axis J direction. The outer hub cylindrical portion 41 is configured by forming a plurality of outer hub outer peripheral protrusions 411 protruding outward and outer hub inner peripheral protrusions 412 protruding inward along the circumferential direction.

  The ridgeline of the outer hub inner circumferential protrusion 412 is parallel to the rotation axis J. In addition, the top of the outer hub inner circumferential protrusion 412 has an R shape.

  In the outer hub 4, a plate-like outer hub plate portion 42 facing the armature 3 is formed at the end of the outer hub cylinder portion 41 on the rotor 2 side. The outer hub plate portion 42 is located between adjacent outer hub outer peripheral projections 411 when the outer hub 4 is viewed along the direction of the rotation axis J.

  In a part of the plurality of outer hub plate portions 42, circular outer hub plate portion holes 43 penetrating the front and back are formed. In the following description, the outer hub plate portion 42 in which the outer hub plate portion hole 43 is formed is referred to as an outer hub first plate portion 42a as necessary.

  The outer hub first plate portion 42a is a plane perpendicular to the rotation axis J. Then, after the armature projection 32 is inserted into the outer hub plate hole 43, the armature 3 and the outer hub 4 are joined by caulking the tip end side of the armature projection 32. The outer hub first plate portion 42a corresponds to the coupling portion of the present invention.

  The remaining portions of the plurality of outer hub plate portions 42 are inclined surfaces inclined with respect to the direction perpendicular to the rotation axis so that a gap is formed between the outer hub plate portions 42 and the armature 3. More specifically, this inclination is such that it approaches the armature 3 as it goes from the inner circumference side to the outer circumference side. In the following description, the outer hub plate portion 42 having an inclined surface is referred to as an outer hub second plate portion 42b as necessary.

  As shown in FIGS. 1, 5, and 6, the inner hub first member 5 is formed by press-molding a metal plate material, and includes a cylindrical inner hub cylinder portion 51 that extends in the rotation axis J direction. The inner hub cylinder portion 51 is disposed on the inner peripheral side of the outer hub cylinder portion 41. The inner hub cylinder portion 51 is configured by alternately forming a plurality of inner hub outer peripheral protrusion portions 511 protruding to the outer peripheral side and inner hub inner peripheral protrusion portions 512 protruding to the inner peripheral side along the circumferential direction.

  The inner hub outer peripheral protrusion 511 and the inner hub inner peripheral protrusion 512 are provided in the same number as the outer hub outer peripheral protrusion 411 and the outer hub inner peripheral protrusion 412. In addition, the tops of the inner hub outer peripheral projection 511 and the inner hub inner peripheral projection 512 have an R shape.

  In the inner hub first member 5, a plate-like inner hub first plate portion 52 that faces the armature 3 is formed on an end portion of the inner hub tube portion 51 on the rotor 2 side and on an inner peripheral side of the inner hub tube portion 51.

  A plurality of inner hub first holes 53 penetrating the inner hub first plate portion 52 are formed in the vicinity of the outer peripheral portion of the inner hub first plate portion 52 along the circumferential direction.

  A plurality of inner hub second holes 54 penetrating the inner hub first plate portion 52 are formed on the inner peripheral side of the inner hub first plate portion 52 with respect to the inner hub first hole 53 along the circumferential direction.

  The material and plate thickness of the inner hub first member 5 and the outer hub 4 are made the same, and the inner hub first member 5 is manufactured from the waste material of the outer hub 4.

  As shown in FIG. 1, the inner hub second member 6 includes a cylindrical inner hub boss portion 61 extending in the rotation axis J direction. This inner hub boss portion 61 is coupled to the shaft of the refrigerant compressor.

  The inner hub second member 6 includes a disk-shaped inner hub second plate portion 62 that spreads from one end side of the inner hub boss portion 61 in the direction perpendicular to the rotation axis. A plurality of inner hub fourth holes 63 penetrating the inner hub second plate portion 62 are formed in the inner hub second plate portion 62 along the circumferential direction.

  Then, after inserting the rivet 8 into the inner hub fourth hole 63 and the inner hub second hole 54 of the inner hub first member 5, the inner hub first member 5 and the inner hub second member 6 are connected by caulking the leading end side of the rivet 8. Are combined. The inner hub first member 5 and the inner hub second member 6 constitute an inner hub of the present invention.

  The elastic member 7 will be described with reference to FIGS. 1 and 7 to 9. The elastic member 7 is made of a rubber-based elastic material and is formed by vulcanization molding. Specifically, after inserting the inner hub first member 5 into the molding die, the molten rubber-based elastic material is injected into the molding die, and the elastic member 7 is molded.

  A portion including the inner hub first hole 53 in the inner hub first plate portion 52 is embedded in the elastic member 7. Accordingly, the portions of the elastic member 7 positioned on both sides of the inner hub first plate portion 52 are connected by the rubber-based elastic material that has entered the inner hub first hole 53, and thereby the inner hub first plate portion 52 of the elastic member 7. Turning over the parts located on both sides of the is prevented.

  Further, the entire inner hub cylinder portion 51 is embedded in the elastic member 7.

  The elastic member 7 integrated with the inner hub first member 5 is press-fitted into the outer hub 4. That is, the elastic member 7 is integrated with the outer hub 4 and the inner hub 5 without using an adhesive.

  In the state in which the outer hub 4 and the inner hub 5 are integrated, the outer hub inner peripheral protrusion 412 and the inner hub outer peripheral protrusion 511 are displaced in the circumferential direction. In other words, the outer hub inner peripheral projection 412 and the inner hub outer projection 511 are arranged at positions that do not overlap in the radial direction.

  Further, in a state where the outer hub 4 and the inner hub 5 are integrated, the elastic member 7 is also disposed in the outer hub outer peripheral protrusion 411. Thereby, the physique of the elastic member 7 is larger than before.

  After the elastic member 7 is press-fitted into the outer hub 4, the armature 3 and the outer hub 4 are coupled. And the main part of the elastic member 7 is arrange | positioned between the outer hub cylinder part 41 and the inner hub cylinder part 51, and a driving force is transmitted from the outer hub cylinder part 41 to the inner hub cylinder part 51. FIG. Further, a part of the elastic member 7 is disposed in the gap between the outer hub second plate portion 42b and the armature 3 so that the relative movement of the elastic member 7 and the outer hub 4 in the rotation axis J direction is suppressed. It has become.

  Further, the elastic member 7 applies an elastic force to the outer hub 4 in a direction away from the rotor 2. Due to this elastic force, a gap is formed between the rotor friction surface 241 and the armature friction surface 31 when the coil 12 is not energized.

  Next, the operation of this embodiment will be described. When the coil 12 is not energized, the electromagnet 1 does not generate electromagnetic force, so the rotor 2 and the armature 3 are separated by the elastic force of the elastic member 7. Therefore, the rotational driving force of the engine is not transmitted to the refrigerant compressor. As a result, the refrigeration cycle device does not operate.

  When the coil 12 is energized, the electromagnetic force generated by the electromagnet 1 exceeds the elastic force of the elastic member 7, and the armature 3 is attracted to the rotor 2 side by the electromagnetic force, and the rotor friction surface 241 and the armature friction surface 31. Are pressed and the rotor 2 and the armature 3 are connected. Therefore, the rotational driving force of the engine is transmitted to the refrigerant compressor via the rotor 2, armature 3, outer hub 4, elastic member 7, inner hub first member 5, and inner hub second member 6. Thereby, the refrigeration cycle apparatus operates.

  The torque fluctuation when the rotational driving force of the engine is transmitted to the refrigerant compressor is absorbed by the elastic deformation of the elastic member 7, but in this embodiment, the elastic member is provided by providing the outer hub outer peripheral projection 411. Since the physique of 7 is larger than before, the stress of the elastic member 7 generated with the elastic deformation at the time of absorbing the torque fluctuation is reduced, and the durability of the elastic member 7 is improved.

  In the above embodiment, the same number of inner hub outer peripheral protrusions 511 and inner hub inner peripheral protrusions 512 as the outer hub outer peripheral protrusions 411 and outer hub inner peripheral protrusions 412 are provided, but as in the first modification shown in FIG. Further, the outer hub outer peripheral protrusion 411 and the outer hub inner peripheral protrusion 412 may be provided more than the inner hub outer peripheral protrusion 511 and the inner hub inner peripheral protrusion 512, or the inner hub as in the second modification shown in FIG. The outer peripheral protrusion 511 and the inner hub inner peripheral protrusion 512 may be provided more than the outer hub outer peripheral protrusion 411 and the outer hub inner peripheral protrusion 412.

  Further, in the above embodiment, the outer hub inner peripheral protrusion 412 and the inner hub outer peripheral protrusion 511 are arranged at positions that do not overlap in the radial direction. However, as in the third modification shown in FIG. You may arrange | position 412 and the inner-hub outer periphery protrusion part 511 in the position which overlaps with radial direction.

  However, the distance between the top of the outer hub inner peripheral protrusion 412 and the top of the inner hub outer peripheral protrusion 511 is longer when the outer hub inner peripheral protrusion 412 and the inner hub outer peripheral protrusion 511 are arranged at positions that do not overlap in the radial direction. Therefore, the stress of the elastic member 7 between the top part of the outer hub inner peripheral projection part 412 and the top part of the inner hub outer peripheral projection part 511 is reduced, which is advantageous in terms of durability.

  Furthermore, in the above embodiment, the outer hub inner peripheral protrusion 412 and the inner hub outer peripheral protrusion 511 have a rounded top. However, as in the fourth modification shown in FIG. 13, the outer hub inner peripheral protrusion 412 and the inner hub outer periphery. The protrusion 511 may be U-shaped.

  Moreover, in the said embodiment, although the armature 3 and the outer hub 4 were couple | bonded by crimping the front end side of the armature projection part 32, you may couple | bond the armature 3 and the outer hub 4 with a rivet.

  In addition, this invention is not limited to above-described embodiment, In the range described in the claim, it can change suitably.

  Further, in the above-described embodiment, it is needless to say that elements constituting the embodiment are not necessarily indispensable except for the case where it is clearly indicated that the element is essential and the case where the element is clearly considered to be essential in principle. .

  Further, in the above embodiment, when numerical values such as the number, numerical value, quantity, range, etc. of the constituent elements of the embodiment are mentioned, it is particularly limited to a specific number when clearly indicated as essential and in principle. The number is not limited to a specific number except for cases.

  In the above embodiment, when referring to the shape, positional relationship, etc. of components, the shape, position, etc., unless otherwise specified and in principle limited to a specific shape, positional relationship, etc. It is not limited to relationships.

2 Rotor (Drive-side rotating body)
3 Armature (driven rotating body)
4 Outer hub 5 Inner hub first member (inner hub)
6 Inner hub second member (inner hub)
7 Elastic member 41 Outer hub cylinder part 51 Inner hub cylinder part 411 Outer hub outer periphery protrusion part 42a Outer hub 1st board part (joining site | part)

Claims (5)

A drive-side rotating body (2) that is rotationally driven by a drive source;
An armature (3) that is attracted to the drive-side rotor by electromagnetic force and receives rotation of the drive-side rotor;
An outer hub (4) having a cylindrical outer hub cylinder portion (41) extending in the rotation axis direction and coupled to the armature;
An inner hub (5, 6) which is disposed on the inner peripheral side of the outer hub cylinder and extends in the direction of the rotation axis and which is coupled to the driven device;
An elastic member (7) made of a rubber-based elastic material, disposed between the outer hub cylinder part and the inner hub cylinder part and transmitting a driving force from the outer hub cylinder part to the inner hub cylinder part,
The outer hub tube portion is formed with a plurality of outer hub outer periphery protrusions (411) protruding in the outer peripheral side along the circumferential direction,
The electromagnetic clutch according to claim 1, wherein the coupling portion (42a) of the outer hub with the armature is located between the outer hub outer peripheral projections adjacent to each other when the outer hub is viewed along the rotation axis direction. The outer hub includes a plate-like outer hub plate portion (42a, 42b) facing the armature between the outer hub outer peripheral projections adjacent to each other when the outer hub is viewed along the rotation axis direction.
A part (42a) of the outer hub plate portion is used as a coupling site with the armature,
The electromagnetic clutch according to claim 1, wherein a gap is formed between the remaining portion (42b) of the outer hub plate portion and the armature, and a part of the elastic member is disposed in the gap. The inner hub includes a plate-like inner hub plate portion (52) disposed on the inner peripheral side of the inner hub tube portion and facing the armature,
The inner hub plate portion is formed with an inner hub hole (53) penetrating the inner hub plate portion,
3. The electromagnetic clutch according to claim 1, wherein the inner hub cylinder part and a part including the inner hub hole in the inner hub plate part are embedded in the elastic member. The inner hub includes an inner hub first member (5) including the inner hub cylindrical portion, and an inner hub second member (6) coupled to the driven device,
The electromagnetic clutch according to any one of claims 1 to 3, wherein the inner hub first member and the outer hub are made of the same material and have the same thickness.   5. The electromagnetic clutch according to claim 1, wherein the elastic member is integrated with the outer hub and the inner hub without using an adhesive. 6.

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