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1. (WO2018142529) TENSIONER

Pub. No.:    WO/2018/142529    International Application No.:    PCT/JP2017/003737
Publication Date: Fri Aug 10 01:59:59 CEST 2018 International Filing Date: Fri Feb 03 00:59:59 CET 2017
IPC: F16H 7/08
Applicants: DAIDO KOGYO CO., LTD.
大同工業株式会社
NHK SPRING CO., LTD.
日本発條株式会社
Inventors: SEKI, Hideaki
関 秀明
YAMADA, Yoshio
山田 佳男
KOBAYASHI, Takao
小林 貴雄
HIRAOKA, Kazuhito
平岡 和人
TAKAHASHI, Shuji
高橋 秀志
Title: TENSIONER
Abstract:
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.