Starter for an internal combustion engine
AssigneeDenso Corporation
InventorsTsutomu Shiga, Masami Niimi, Masanori Ohmi
Life of this patent
Estimating the term…
Abstract
A starter for an internal combustion engine has a resistance ratio rM/rB equal to or less than 0.4, when rM represents a motor internal resistance and rB represents a battery internal resistance. Furthermore, the starter has a size ratio L/D equal to or less than 1.0, when L represents an axial length of the armature and D represents an outer diameter of the armature. Furthermore, a means for suppressing temperature rise is provided for the starter.
Claims11
A starter for an internal combustion engine that receives electric power from a battery, comprising:
- a pinion meshing with a ring gear of an internal combustion engine, and
- a motor section including a yoke and an armature for driving said pinion via a speed-reduction mechanism, wherein
- an internal resistance rM of said motor section and an internal resistance rB of said battery satisfy a relationship that a resistance ratio rM/rB is equal to or less than 0.4,
- an axial length L of a coil constituting said armature and an outer diameter D of said armature satisfy a relationship that a ratio L/D is equal to or less than 1.0, and
- a temperature-rise suppressing means for preventing temperature rise in said starter is provided.
A starter for an internal combustion engine that receives electric power from a battery, comprising:
- a pinion meshing with a ring gear of an internal combustion engine,
- a motor section including a yoke and an armature for driving said pinion via a speed-reduction mechanism,
- a stationary contact positioned at one end of a terminal provided in said starter and connected to a battery cable for supplying electric power from said battery to said starter, and
- a movable contact directly connected to a pigtail of a brush of said motor section and cooperative with said stationary contact to constitute a switch, wherein
- an internal resistance rM of said motor section and an internal resistance rB of said battery satisfy a relationship that a resistance ratio rM/rB is equal to or less than 0.4,
- an axial length L of a coil constituting said armature and an outer diameter D of said armature satisfy a relationship that a ratio L/D is equal to or less than 1.0, and
- a means for suppressing temperature rise in said starter is provided.
A permanent magnet field type starter for an internal combustion engine that receives electric power from a battery, comprising:
- a pinion meshing with a ring gear of an internal combustion engine, and
- a motor section including a yoke and an armature for driving said pinion via a speed-reduction mechanism, wherein
- when rB represents an internal resistance of said battery, rT represents an overall brush resistance including a contact resistance to a brush and a commutator, and rA represents an armature resistance,
- the internal resistance rB of said battery and the internal resistance rM (rM=rT+rA) of said motor section satisfy a relationship that a resistance ratio rM/rB is equal to or less than 0.4,
- an axial length L of a coil constituting said armature and an outer diameter D of said armature satisfy a relationship that a ratio L/D is equal to or less than 1.0, and
- said overall brush resistance rT is smaller than said armature resistance rA, and said overall brush resistance rT is equal to or less than 1.5.
Dependencies are inferred from the claim text.