Magnet switch for starter
AssigneeDenso Corporation
InventorsTsutomu Shiga, Masami Niimi
Life of this patent
Estimating the term…
Abstract
In a magnet switch for a starter, a first contact portion and a second contact portion are connected in parallel between a battery and a motor. The first contact portion makes contact through a resistive component so that the motor starts rotation at low speed. By this, a pinion is pushed in an axial direction by an axial component of splines and brought into mesh with a ring gear in a condition that its rotation is restricted. Thereafter, the second contact portion makes contact in accordance with further movement of a plunger so that electric power is fully supplied to the motor through the second contact portion, thereby starting engine. A fixed contact of the first contact portion is made of a carbon material. The resistive component is provided by the carbon material.
Claims21
A magnet switch for a starter to supply electric power to a motor, comprising:
- a first contact portion having a fixed contact and a movable contact, the first contact portion including a carbon material;
- a second contact portion having a fixed contact and a movable contact, the second contact portion including a metal material, wherein the first contact portion and the second contact portion operate an electrical connection between the motor and a battery, and wherein the first contact portion and the second contact portion are disposed such that the first contact portion makes contact before the second contact portion makes contact.
A magnet switch for a starter, comprising:
- an attraction coil for generating an attraction force when excited;
- and
- a contact unit for electrically connecting a battery and a motor, including:
- a first contact portion for supplying electric power to a motor through a resistive component, the first contact portion including a movable contact and a fixed contact, one of the movable contact and the fixed contact being electrically connected to a battery and the other of the movable contact and the fixed contact being operatively coupled to a plunger that is movable by the attraction force;
- and
- a second contact portion for supplying electric power to the motor, the second contact portion including a movable contact comprised of a metal and a fixed contact comprised of a metal, one of the movable contact and the fixed contact being electrically connected to the battery and the other of the movable contact and the fixed contact being operatively coupled to the plunger,
- wherein the contact unit is disposed such that the movable contact and the fixed contact of the first contact portion are brought into contact with each other while bending a return spring by the plunger to supply the electric power to the motor through the resistive component before the movable contact and the fixed contact of the second contact portion are brought into contact with each other by further movement of the plunger to supply the electric power to the motor, and when the power supply to the attraction coil is turned off, the movable contact and the fixed contact of the second contact portion are separated before the movable contact and the fixed contact of the first contact portion are separated by a return force of the return spring, and
- wherein the resistive component is provided by a contact of the first contact portion, the contact being made of a carbon material.
A magnet switch for a starter to supply electric power to a motor, the magnet switch comprising:
- a first contact portion including a fixed contact and a movable contact for electrically connecting the motor and a battery, one of the fixed contact and the movable contact being made of a carbon material;
- and
- a second contact portion including a fixed contact comprised of a metal and a movable contact comprised of a metal, the second contact portion connected in parallel with the first contact portion between the battery and the motor,
- wherein the first contact portion is disposed to make contact before the second contact.
Dependencies are inferred from the claim text.