Patent ID: 6753621
Filing Date: 2004-06-22
Classification: F02B,F02D,F02N,F16H,Y10T

Abstract:
A starter for an internal combustion engine, comprising:an armature having an armature shaft; a motor case for accommodating said armature; a planetary gear speed reduction mechanism connected to said armature shaft at an end of said armature shaft; a frame, coupled with said motor case, for covering said planetary gear speed reduction mechanism; and a partition plate, disposed between said motor case and said frame, for forming a motor chamber and a speed reduction chamber; wherein said partition plate has an armature-shaft hole and a chamber-connection passage between said armature shaft hole and said armature shaft for connecting said motor chamber and said speed reduction chamber, and a circumferential groove is formed at a peripheral portion of said frame between said partition plate and said frame to connect said speed reduction chamber and the outside, thereby forming a ventilation passage extending from said motor chamber through said speed reduction chamber to the outside.