Distributor for contactless ignition apparatus for internal combustion engine

A distributor for a contactless ignition apparatus of an internal combustion engine, comprising a distributor shaft arranged to rotate in synchronism with the engine, a distribution rotor arranged to rotate together with said shaft, an electrode for receiving power from said distributor rotor, a distributor cap to which said electrode is fixed, a housing combined with said cap to form the outline of the distributor and supporting said distribution shaft at the center thereof, a pick-up coil coaxially disposed around said distributor shaft, means for forming a magnetic path crossing to said pick-up coil through said shaft, means for inducing a signal voltage on said pick-up coil by changing the magnetic flux in the magnetic path at an ignition timing, an ignition control circuit for shaping the waveform of the signal voltage, a switching element for switching the current flowing into a primary coil of an ignition coil in accordance with the output of said ignition control circuit, a control circuit module including said ignition control circuit and said swlitching element which are mounted on a metal base, a resin case integrally connected to said pick-up coil, means for fixing said control circuit module on said resin case such that the metal base forms a portion of an outer wall of said resin case, a heat-dispersion path for dispersing the heat being produced by said switching element to a heat-conductive material within said distributor through said metal base, and means for fixing a contactless ignition device including said resin case having said control circuit module and said pick-up coil to a fixing member within said distributor in such a manner that said contactless ignition device does not touch to any movable member within said distributor.

A distributor for a contactless ignition apparatus of an internal combustion engine, comprising a distributor shaft arranged to rotate in synchronism with the engine, a distribution rotor mounted on the top of said shaft, an electrode for receiving power from said distributor rotor, a distributor cap to which said electrode is fixed, a housing combined with said cap to form the outline of the distributor and supporting said distribution shaft at the center thereof, a pick-up coil coaxially disposed around said distributor shaft, means for forming a magnetic path crossing to said pick-up coil through said shaft, means for inducing a signal voltage on said pick-up coil by changing the magnetic flux in the magnetic path at an ignition timing, an ignition control circuit for shaping the waveform of the signal voltage, a power transistor for switching the current flowing into a primary coil of an ignition coil in accordance with the output of said ignition control circuit, a supporting member integrally connected to said pick-up coil for supporting said pick-up coil, said control circuit and said power transistor, a heat-dispersion plate forming a portion of an outer wall of said supporting member, means for connecting said power transistor to an inner wall of said heat-dispersion plate, a heat-conductive member attached to the outer surface of said heat-dispersion plate for forming a heat-dispersion path dispersing the heat produced by said power transistor, means for fixing said heat-conductive member to said housing, and means for fixing a contactless ignition device including said pick-up coil and said supporting member to said heat-conductive member in such a manner that said contactless ignition device does not touch to any movable member within said distributor.