公开(公告)号：US09869378B2

公开(公告)日：2018-01-16

申请号：US14772681

申请日：2014-02-06

Applicant: NHK SPRING CO., LTD.

Inventor： Takao Kobayashi ,  Takahiro Ito ,  Yoshiyuki Takahashi ,  Kazuhito Hiraoka

IPC: F16H7/08 ,  F16H7/22 ,  F01L1/18

CPC classification number: F16H7/08 ,  F01L1/18 ,  F16H2007/0804 ,  F16H2007/081 ,  F16H2007/0893

Abstract: A load-applying device is provided that includes a spiral spring that is formed from a thin strip that is wound multiple times in a spiral shape; a movable body; and a fixing member. The spiral spring is disposed between the movable body and the fixing member, in a manner capable of performing a diameter reduction operation and a diameter expansion operation, and an outer-circumference part of the spiral spring contacting the movable body and the fixing member directly, or indirectly.

公开(公告)号：US10794455B2

公开(公告)日：2020-10-06

申请号：US16529137

申请日：2019-08-01

Applicant: DAIDO KOGYO CO., LTD. ,  NHK SPRING CO., LTD.

Inventor： Hideaki Seki ,  Yoshio Yamada ,  Takao Kobayashi ,  Kazuhito Hiraoka ,  Shuji Takahashi

IPC: F16H7/08

Abstract: A tensioner includes a power spring, and a backup member being in contact with the power spring and supporting the power spring by acting an urging force in a direction opposite to a radial shift of the power spring in a direction in which the power spring is wound. The power spring is unwound in a condition in which an inter-plate frictional force of the power spring is small in a case where an urging force acting from a power spring to a tension member is greater than a load acting from the tensioner arm to the power spring and the power spring is wound in a condition in which the inter-plate frictional force of the power spring is large in a case where the urging force acting from the power spring to the tension member is smaller than the load acting from the tension member to the power spring.

公开(公告)号：US11898635B2

公开(公告)日：2024-02-13

申请号：US17263862

申请日：2019-07-31

Applicant: NHK SPRING CO., LTD. ,  DAIDO KOGYO CO., LTD.

Inventor： Yoshio Yamada ,  Takao Kobayashi ,  Kazuhito Hiraoka ,  Shuji Takahashi ,  Hideaki Seki

IPC: F16H7/08

CPC classification number: F16H7/08 ,  F16H7/0848 ,  F16H2007/081 ,  F16H2007/0802 ,  F16H2007/0804 ,  F16H2007/0806 ,  F16H2007/0853 ,  F16H2007/0863 ,  F16H2007/0872 ,  F16H2007/0893

Abstract: A tensioner includes a movable section, a fixed section, a flat spiral spring, and a back-up spring. The movable section receives load from an entrained transmission body through a tension member. The fixed section supports the movable section so as to be capable of displacing. The flat spiral spring biases the movable section so as to resist the tension member. The flat spiral spring unwinds in a state in which there is a small inter-plate friction force in cases in which there is a large biasing force applied to the tension member to counter load acting from the tension member. The flat spiral spring winds-up in a state in which there is a large inter-plate friction force in cases in which there is a small biasing force applied to the tension member to counter load acting from the tension member. The back-up spring limits wind-up of the flat spiral spring.