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|1. (WO2018142529) TENSIONER|
|Applicants:||DAIDO KOGYO CO., LTD.
NHK SPRING CO., LTD.
For conventional mechanical tensioners using a spiral spring, the function of attenuating and cushioning chain vibrations is inadequate or durability is inadequate, and the range of use thereof is limited. In the tensioner (17) of the present invention, the biasing force of a spiral spring (21) acts on a plunger (20) and opposes the load from a tensioner arm (16). When the plunger (20) protrudes, the diameter of the spiral spring expands and the spring is loosened, and the interlayer frictional force under these circumstances is small. When the plunger (20) is pushed in, the spiral spring (21) is tightened and a large interlayer frictional force due to diameter reduction is active. As a result of this difference in frictional force, chain vibrations are attenuated and cushioned.