Denso Corporation

Nippondenso Co., Ltd.

Nippondenson

Keisuke Kawano

Kazutoyo Oosuka

Masami Kojima

Akimitsu Sugiura

Hiroyuki Wakabayashi

Noriyasu Inomata

Motoya Ito

Tomonari Chiba

Katsuhisa Kato

Yoshitaka Satou

Katsumi Nakazawa

Naruhiko Inayosi

Kazuhide Kawai

Yoshimi Nakase

Yoshitaka Sato

Norihiro Adachi

Masahiko Aoyama

Hiroyuki Yamamoto

Tomonori Ishikawa

Makoto Suga

Kiyoshi Hirase

Akimitsu Suguira

An electric motor includes a housing that receives multiple magnets that are circumferentially arranged in the housing. A resilient member has two inserted portions that are respectively inserted into gaps formed among the magnets. For example, four inserted portions of the two resilient members are respectively inserted into four gaps formed among four magnets, so that the inserted portions are resiliently deformed in the gaps. The inserted portions apply force to the magnets such that the magnets are circumferentially spaced from each other. Thus, the four magnets are urged onto an inner wall of the housing by the two resilient members. As a result, movement of the magnets is restricted in both of the circumferential direction and the axial direction of the housing. Therefore, the magnets can be maintained in the housing using a simple structure without increasing the number of components.

Electric motor having resilient member and apparatus for manufacturing the same

A stick-type ignition coil have a central core, a cylindrical member, primary spool, primary coil, secondary spool, secondary coil, outer core and a resin insulator. The two longitudinal end corners and faces of the core are covered by respective buffer members. The inner circumferential corners of the outer core is supported by ring members. Some of the members disposed radially inside and other members disposed radially outside of the inside members are held slidably to each other in the ignition coil. The spools are made of resin containing a rubber in excess of 5 weight percent and reinforcing materials. The resin insulator contains a flexible material.

Stick-type ignition coil having improved structure against crack or dielectric discharge

A multi-layer coil is wound around a bobbin having a center pillar and a small and a large flanges connected to longitudinal ends of the center pillar. A winding space having a trapezoidal cross-section in a plane cut through the center axis of the bobbin is formed outside the center pillar between both flanges. To wind the multi-layer coil in this winding space, a turning position where a layer of the coil moves up to a higher layer is set by a position setter, and the turning position is automatically shifted layer by layer to form a sloped outer surface of the coil. The coil is wound in a shape fitting the trapezoidal winding space without reducing the winding speed. The space factor of the coil in the winding space is improved, making the coil compact in size.

Apparatus and method for winding multi-layer coil in trapezoidal winding space

An ignition coil for an internal combustion engine is mainly made up of a transformer part and a control circuit part and a connecting part, and the transformer part is made up of a iron core which forms an open magnetic path, magnets, a secondary spool, a secondary coil, a primary spool and a primary coil. By respectively setting the cross-sectional area S of the iron core between 39 to 54 mm , the ratio of the cross-sectional area S of the magnets with the cross-sectional area S of the iron core in the 0.7 to 1.4 range, the ratio of the axial direction length L of the iron core with the winding width L of the primary and secondary coils in the 0.9 to 1.2 range, and the winding width L in the 50 to 90 mm range, the primary energy produced in the primary coil can be increased without increasing the external diameter A of the case.

Ignition coil for an internal combustion engine

An electromagnetic coil which may be employed as an ignition coil for an internal combustion engine is disclosed. The electromagnetic coil includes a lower voltage winding portion and a higher voltage winding portion. The lower voltage winding portion is wound around a spool and includes a plurality of winding layers overlapped with each other and inclined at a given angle to the length of the spool. Each of the winding layers includes a collection of turns made up of a leading portion of wire. The higher voltage winding portion is wound around the spool adjacent the lower voltage winding portion and includes a plurality of winding layers overlapped with each other and inclined at a given angle to the length of the spool. Each of the winding layers includes a collection of turns made up of a trailing portion of the wire.

Slant winding electromagnetic coil and ignition coil for internal combustion engine using same

Slant winding electromagnetic coil and ignition coil for internal

A traverse shaft section 609 shifts in response to the rotation of a bobbin rotating section 604 with a predetermined winding pitch P1 equivalent to two to 10 times the diameter of a wire rod 520. With this shift movement of traverse shift section 609, wire rod 520 extracted from a winding nozzle section 610 shifting together with traverse shaft section 609 is wound spirally along a slant surface 530 formed by a first winding section 541 at the winding pitch P1 equivalent to two to 10 times the diameter of a wire rod 520. As a result, an advancing-side wire rod 520a and a reversing-side wire rod 520b cross over each other at opposing inclinations. Hence, it becomes possible to prevent the reversing-side wire rod 520b, when wound on the advancing-side wire rod 520a, from pulling and dislocating the advancing-side wire rod 520a from its regular winding position, thereby eliminating undesirable winding collapse.

Electromagnetic coil and manufacturing apparatus for the same

A piling machine includes a table with a plurality of step-shelves, a slider and a stopper. One of a plurality of iron strips is placed in a prescribed order on each of the step-shelves, caught by the slider one by one, and piled together as the slider proceeds. When the slider is stopped by the stopper, all the strips are piled up to form a strip assembly. The stopper has a curved front surface to neatly hold the strip assembly, thereby easily forming the strip assembly into a desired shape.

Method and apparatus for manufacturing a magnetic core

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Kariya, Japan

Keisuke Kawano