Denso Corporation

Other

Nippondenso Co., Ltd.

Masahiro Kinoshita

Yasuo Tabuchi

Hiroshi Shohara

Yasuji Kasuya

Tetuo Ohno

Haruo Suzuki

Mitsunori Adachi

Shigeo Murata

Hidetaka Shingai

Kimio Suzuma

Yutaka Ito

Juneichi Nakagawa

An annular groove portion is formed between portions corresponding to groove portions and thereafter the groove portions are formed while the annular groove is pressed. Consequently, since the stress produced due to a plastic deformation in forming the groove portions can be absorbed by the annular groove having a smaller rigidity than the groove portions, no undesirable plastic deformation of the groove portions occurs and hence the accuracy of the finished size of the multi-stage pulley can be improved. Furthermore, the capital investment in groove forming rollers can be reduced and the manufacturing cost of the multi-stage pulley can be reduced.

Multi-stage pulley and production method thereof

The manufacturing cost of a multi-stage pulley is reduced without coaxially arranging a plurality of groove forming sections. While a portion between groove sections is being pushed by a pushing roller , the groove sections are successively formed. While a portion of workpiece W pushed by a groove forming roller to form one groove section and a portion of workpiece W pushed by a groove forming roller to form the other groove section are being shifted from each other in the circumferential direction, one groove section ( ) and the other groove section ( ) are simultaneously formed. Due to the foregoing, when the groove sections are formed, it is possible to prevent the deformation of the groove section and the groove section which is adjacent to it. Accordingly, it is possible to enhance the yield of the multi-stage pulley without coaxially arranging a plurality of groove forming sections. Therefore, the cost of manufacturing the multi-stage pulley can be reduced.

Method of manufacturing multi-stage pulley

An electromagnetic clutch has an electromagnetic coil and a coil housing for accommodating the coil. The coil is inserted into the coil housing together with insulating members made of readily deformable insulating material. The insulating members are pressed downwardly by the coil and deformed according to an inner shape of the coil housing. As a result, the coil and the insulating members are accommodated in the coil housing with a preset gap between a surface of the coil and an inside surface of the coil housing, formed by the insulating members. The gap is filled with melted resin so that the coil is firmly secured in the coil housing. Thus, the coil can be readily secured in and insulated from the coil housing at a low cost.

Insulated electromagnetic coil for electromagnetic clutch

A multi-stepped pulley, and a method and apparatus for manufacturing the same, wherein the mechanical strength is increased while keeping down an increase of mass and a rise of manufacturing costs by pressing against portions of a surface of a hollow metal material having a circular cross-section corresponding to a connection portion of a plurality of pulleys by pressing rollers and simultaneously crushing the material in an axial direction so as to integrally form first and second rims, first and second webs, and a connection portion thereof.

Multi-stepped pulley, method of manufacturing same, and apparatus for

An electromagnetic clutch for a compressor in an air conditioning apparatus for an automobile. A temperature fuse unit 13 is arranged in an electric circuit for an electromagnetic coil of the clutch for opening the circuit when a temperature increase is generated due to an occurrence of seizing. The temperature fuse unit 13 is arranged in a coil housing 4 at a location adjacent a frictional surface 2a of a rotor of the clutch and an inner sleeve portion 4a of the coil housing 4. During normal operation of the clutch, heat around the electromagnetic coil is transmitted to the coil housing of an increased heat conductivity, made of a magnetizing metal materials, thereby preventing the temperature around the temperature fuse 13 from being increased. At an occurrence of seizing of the compressor, heat generated by a sliding contact between an armature 8 and rotor 2 is quickly transmitted to the temperature fuse 13 via an end of the inner sleeve portion 4b of the coil housing 4, which allows the temperature fuse to be instantly melted and thus opened.

Electromagnetic clutch

Growing community of inventors

Kariya, Japan

Masahiro Kinoshita