To provide a frictional engagement type torque limiter of a specified mechanism employing a coil spring, which makes lubrication failure hardly occur in an initial operation state, or prevents the occurrence of abnormal sounds even though a temperature is high.
In a torque limiter, an inner ring 2 is provided inside an outer ring 1. A small diameter coil 3a for fastening the outer radial surface of the inner ring 2 is provided at a coil spring 3 incorporated between the inner and outer rings. One of both ends of the coil spring 3 is fixed to the outer ring 1. When the inner ring 2 is frictionally engaged with the coil spring 3 by a fastening force of the coil spring 3, torque can be transmitted between the inner ring 2 and the outer ring 1. While the inner ring 2 is formed of an oil impregnated sintered metal, a predetermined amount of lubricating oil for refilling a shrinkage quantity of a lubricating oil volume after impregnation treatment is applied to the surface of the inner ring 2. The lubricating oil of a refilling lubricating oil volume shrinkage quantity is lubricating oil having viscosity higher than the lubricating oil for impregnation treatment. The torque limiter preferably introduces the lubricating oil of 100 cSt-1,200 cSt.
COPYRIGHT: (C)2008,JPO&INPIT
TAKADA SEIICHI
HONDA MASAAKI
YAMAMOTO TAKASHI
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Torii Kazuhisa
Takayoshi Tagawa
Higashio Masahiro