Engine starter with protective function against over current
AssigneeDenso Corporation
InventorKuniaki Nito
Life of this patent
Estimating the term…
Abstract
In a starter for starting an engine having a motor to which starting current is supplied from a battery, the motor has a field coil for forming a magnetic field with the supply of current, and the starter has wiring for supplying current from the battery to the field coil. The wiring has a cross section perpendicular to the longitudinal direction, which is smaller than a cross section perpendicular to the longitudinal direction of the winding of the field coil, so that a cross section reduction portion is integrated into the wiring. The cross section reduction portion functions as a fuse for shutting down an internal circuit of the motor at an earlier occasion when an overcurrent passes through the internal circuit.
Claims18
A starter for starting an engine, comprising:
- a motor equipped with at least one field coil receiving a starting current from a power source to energize the at least one field coil so as to generate a magnetic field;
- and
- a current-relaying element being disposed to form at least part of an electric path connecting the at least one field coil and the power source and having a section-reduced portion of which cross section area is less than a cross section area of a winding composing said at least one field coil, the cross section area of the section-reduced portion being decided to cause the section-reduced portion to function as a fuse against an excessive amount of the starting current, wherein:
- said current-relaying element is a connector bar which connects said at least one field coil and a lead of the motor;
- a part of the connector bar is connected to the lead of the motor;
- one end portion of the connector bar is connected to a first field coil and another one end portion of the connector bar is connected to a second field coil;
- one side of the connector bar is longer than another side of the connector bar on a basis of the connecting part connected to the lead;
- and
- the section-reduce portion is located on the one side of the connector bar and the another side of the connector bar.
A starter for starting an engine, comprising:
- a motor equipped with a field coil receiving a starting current from a power source to energize the field coil so as to generate a magnetic field;
- and
- a current-relaying element being disposed to form at least part of an electric path connecting the field coil and the power source and having a section-reduced portion of which a cross section area is less than a cross section area of a winding composing said field coil, the cross section area of the section-reduced portion being decided to cause the section-reduced portion to function as a fuse against an excessive amount of the starting current,
- wherein:
- said field coil is composed of a plurality of field coils and said connecting wire is composed of a plurality of connecting wires,
- an end of one of first field coils is connected to an end of one of second field coils via a first connecting wire,
- an end of another one of first field coils is connected to an end of another one of second field coils via a second connecting wire, and
- said section-reduced portion is integrally formed with said connecting wire.
Dependencies are inferred from the claim text.