Electromagnetic clutch
First Claim
1. An electromagnetic clutch comprising:
- clutch disc means connected to a rotary shaft;
a rotor including a sleeve portion coaxially mounted with respect to the rotary shaft and supported on a bearing, a pole face portion extending radially outwardly from one end of the sleeve portion, and a cylindrical portion extending coaxially with respect to the rotary shaft from an outer end portion of the pole face portion toward the other end of the sleeve portion thereby defining an annular space;
a one piece finished core member, said core member being disposed in the annular space and having an inner cylinder portion one end of which is extended toward the pole face portion of the rotor so that the inner cylindrical portion faces the sleeve portion of the rotor with a small air gap therebetween, a bottom portion extending outwardly from the other end of the inner cylindrical portion of the core member, and an outer cylindrical portion having a cylindrical outer face which faces the cylindrical portion of the rotor with a small air gap;
an excitor supported by the core member for exciting the core member; and
a one piece supporting member including a sleeve portion extending coaxially surrounding the rotary shaft extending outwardly from one end of the sleeve portion and forcibly tightly inserted in the inner cylindrical portion of the core member so as to define an annular space within which the sleeve portion of the rotor is received, the flange portion having an engagement portion thereon for engaging said inner cylindrical portion of the core.
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Accused Products
Abstract
An electromagnetic clutch comprises a pulley rotatable about a shaft, an armature which is axially movably connected to the shaft and faces a portion of the pulley so as to contact with electromagnetic force thereby coupling the pulley and the shaft, an electromagnet with a winding and a core which has cylindrical face coaxial of the shaft, a part of which core faces to a part of the pulley with small air gap so as to make magnetic circuit, a supporting member which has a cylindrical portion surrounding the shaft with a gap and rotatably supporting the pulley through a bearing, and a flange portion spreading out from the one end of the cylindrical portion. The supporting member is secured to the core of the electromagnet with the flange portion tightly inserted in the cylindrical face of the core, thereby defining an electromagnetic assembly in which a recess for engagement with a machine is formed. The core is precisely press-formed, and the electromagnetic assembly is precisely machined at the outer face of the cylindrical portion of the supporting member and at the recess, on basis of the core. By energizing the winding a magnetic circuit is produced whereby magnetic flux passes through the core, the pulley, and the armature so that the armature is attracted to the pulley to contact therewith.
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Citations
16 Claims
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1. An electromagnetic clutch comprising:
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clutch disc means connected to a rotary shaft; a rotor including a sleeve portion coaxially mounted with respect to the rotary shaft and supported on a bearing, a pole face portion extending radially outwardly from one end of the sleeve portion, and a cylindrical portion extending coaxially with respect to the rotary shaft from an outer end portion of the pole face portion toward the other end of the sleeve portion thereby defining an annular space; a one piece finished core member, said core member being disposed in the annular space and having an inner cylinder portion one end of which is extended toward the pole face portion of the rotor so that the inner cylindrical portion faces the sleeve portion of the rotor with a small air gap therebetween, a bottom portion extending outwardly from the other end of the inner cylindrical portion of the core member, and an outer cylindrical portion having a cylindrical outer face which faces the cylindrical portion of the rotor with a small air gap; an excitor supported by the core member for exciting the core member; and a one piece supporting member including a sleeve portion extending coaxially surrounding the rotary shaft extending outwardly from one end of the sleeve portion and forcibly tightly inserted in the inner cylindrical portion of the core member so as to define an annular space within which the sleeve portion of the rotor is received, the flange portion having an engagement portion thereon for engaging said inner cylindrical portion of the core. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An electromagnetic clutch comprising:
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clutch disc means connected to a rotary shaft; a rotor having a pole face, and inner walls defining an annular cavity therein, said rotor being supported coaxially about said shaft; an annular one piece core member disposed about said shaft in said annular cavity; an excitor supported on said core member within said annular cavity; an annular one piece supporting member formed of a non-magnetizable material for supporting said rotor for relative rotation therebetween; and force fit means for securing said core member to said supporting member, said force fit means being formed by an outer cylindrical surface of said supporting member being dimensioned so as to fit tightly within an inner surface of said core member. - View Dependent Claims (11, 12, 13, 14)
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15. An electromagnetic clutch comprising:
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clutch disc means connected to a rotary shaft; a rotor having a pole face, and inner walls defining an annular cavity therein, said rotor being supported coaxially about said shaft; an annular one piece core member disposed about said shaft in said annular cavity; an excitor supported on said core member within said annular cavity; an annular one-piece supporting member for supporting said rotor for relative rotation therebetween said supporting member being secured within said core member; and wherein said annular support member is formed of a non-magnetizable material.
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16. An electromagnet according to claim 16, wherein said non-magnetic material is aluminum.
Specification