Hydraulic tensioner with controllable inlet pressure

    公开(公告)号:US10738860B2

    公开(公告)日:2020-08-11

    申请号:US15714088

    申请日:2017-09-25

    Abstract: A pressure regulator is in fluid communication with a supply inlet of a hydraulic tensioner to actively control fluid to the inlet of the hydraulic tensioner. By actively controlling the pressure regulator based on engine conditions and thus the oil pressure being fed to the hydraulic tensioner, the oil pressure to the hydraulic tensioner may be reduced at low engine speeds, increasing the efficiency of the timing system, or allowing full oil pressure at high engine speeds and low engine temperature.

    Rotational tensioner with stored energy and damping feature

    公开(公告)号:US10094450B2

    公开(公告)日:2018-10-09

    申请号:US15504067

    申请日:2015-08-18

    Abstract: A tensioner uses a low rate torsion spring in a first stage and a high rate torsion spring in a second stage to maintain tension in a chain or belt. The first stage is connected to the second stage by a torque coupling. The high rate torsion spring is maintained in an energized state between a ground and a dead stop to store energy and to provide tension under high loads. In some embodiments, the torque coupling is a damper. In other embodiments, the torque coupling is a clutch. A method stores energy in a high rate torsion spring of a tensioner.

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