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Chain drive tensioner spring force control mechanism

  • US 9,879,764 B2
  • Filed: 05/04/2016
  • Issued: 01/30/2018
  • Est. Priority Date: 09/22/2011
  • Status: Expired due to Fees
First Claim
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1. A tensioner for a passive tensioner system for tensioning a chain having a chain span or a belt, comprising:

  • a housing having a cylindrical bore;

    a hollow piston comprising a body having an open end and a closed end and a hollow interior having an inner diameter;

    a hollow moveable sleeve comprising a hollow body having an interior with an inner diameter, having a first portion received by the cylindrical bore of the housing and a second portion, and an inner flange at an end of the second portion, the inner flange having a top surface and a bottom surface;

    the hollow piston and the hollow moveable sleeve being coaxially arranged within the cylindrical bore of the housing, such that one of the hollow piston or the hollow moveable sleeve is received within the bore of the other of the hollow piston or hollow moveable sleeve;

    a piston spring received within the hollow interior of the piston, for biasing the piston outwards from the sleeve, having a first end contacting an inner surface of the closed end of the piston and a second end contacting the top surface of the flange of the moveable sleeve;

    a bias spring received within the bore of the housing and the hollow interior of the moveable sleeve, for biasing the sleeve outwards from the housing, with a first end in contact with the bottom surface of the inner flange of the sleeve and a second end;

    a first hydraulic chamber formed by the hollow interior of the body of the moveable sleeve, the hollow interior of the piston, and the bore of the housing, having a first fluid input;

    a second hydraulic chamber formed by the cylindrical bore of the housing and the moveable sleeve, such that an inward force acting to push the piston into the housing creates a fluid pressure in the second hydraulic chamber, causing the movable sleeve to exert an outward force on the piston through the piston spring, opposing the inward force.

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