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US 2003/0193382 A1Published application
Magnet switch for starter
AssigneeDenso Corporation
InventorsTsutomu Shiga, Masami Niimi
Life of this patent
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AssigneeDenso Corporation
InventorsTsutomu Shiga, Masami Niimi
Estimating the term…
A magnet switch has a coil of a reduced size and a sufficiently large contact and does not have a rod running through the plunger or the fixed iron core. A flange and a joint are fixed at one end of the plunger. The arm of the flange is connected to a holder via an elastic body. Movable contacts are pushed into the holder to be fixed at one end thereof. When the plunger moves, the flange, the holder, and the movable contacts move somewhat simultaneously to work as a switch.
A magnet switch for a starter, for providing an electric current to a starter motor, the magnet switch comprising:
A magnet switch for starter, for providing an electric current to a starter motor, having an attraction coil (51) of a substantially cylindrical shape;
A magnet switch for a starter, for providing an electric current to a starter motor by contacting a moveable contact to a fixed contact, comprising:
Dependencies are inferred from the claim text.
From the US filing history. Foreign family members aren’t listed.
Backward citations are indexed for grants only.
Circuits specially adapted for starting of engines: details of the switching means in starting circuits, e.g. relays or electronic switches
Armature is movable between two limit positions of rest and is moved in one direction due to energisation of an electromagnet and after the…:…
Auxiliary contact devices: auxiliary switch inserting resistor during closure of contactor
Starting of combustion engines
Term end not estimated
This application is based upon, claims the benefit of priority of, and incorporates by reference, the contents of Japanese Patent Applications No. 2002-110296 filed Apr. 12, 2002.
1. Field of the Invention
The present invention relates to a starter motor for starting internal combustion engines, and particularly to an improved magnet switch for use in such a starter motor.
The present invention will become more fully understood from the detailed description and the accompanying drawings, wherein:
FIG. 1 is a cross-sectional view of the starter of a first embodiment of the invention;
FIG. 2 is a cross-sectional view of the switch of FIG. 1;
Now the starter switch of the invention will be described with reference to a first embodiment shown in FIGS. 1, 2 and 3.
A switch 50 has an attraction coil 51 that generates electromagnetic force, a plunger 52 that forms a magnetic circuit, a case 55, a fixed iron core 54, and an air gap 56 between the plunger 52 and the fixed iron core 54. The case 55 includes a cylindrical part 55a and side walls 55b, 55c, constituting the fixed part of the switch covering the attraction coil 51 together with the fixed iron core 54. The cylindrical part 55a, side walls 55b, 55c of the case 55, and the fixed iron core 54 may be either separated or integrated, as long as they can form a magnetic circuit (in the figure, the side wall 55b and fixed iron core 54 are made in one piece).
A first contact 70 is composed of a fixed contact 71 and a movable contact 72. The movable contact 72 forms part of a first elastic body 73 made of a conductive, mechanically strong material such as phosphor bronze.