Chain tensioner
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorAkira Sonobata
Life of this patent
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Abstract
To enable the simultaneous achievement of the enhancement of an oscillation absorption function of a tensioner arm for a transmission chain and the enhancement of wear resistance in a chain tensioner. A tensioner arm is composed of an elastic band tensioner arm body curved toward a transmission chain and a flexible tensioner shoe which covers the front of the tensioner arm body and which is provided with a chain guide groove to the front of which the transmission chain is slidably fitted. The width of the middle in the longitudinal direction of the tensioner arm body is set so that the width is smaller than the width of each end of the arm body.
Claims20
A chain tensioner provided with a tensioner arm relatively slidably engaged with an outside on a loose side of a transmission chain with an end rockably supported by a fixed structure and coupling a driving sprocket and a driven sprocket and a tensioner lifter supported by a fixed structure for pressing an end of the tensioner arm on the loose side of the transmission chain, wherein the tensioner arm comprises:
- an elastic band tensioner arm body curved toward the transmission chain, the tensioner arm body being made of a spring steel plate;
- and
- a flexible tensioner shoe for covering a front of the tensioner arm body and having a chain guide groove to the front wherein the transmission chain is slidably fitted;
- and
- a width of a middle in the longitudinal direction of the tensioner arm body is set to a smaller value relative to a width of each end of the tensioner arm body so that a natural oscillation frequency in the middle of the tensioner arm body is different from the natural oscillation frequency at each of the ends of the tensioner arm body, thereby preventing resonance of the tensioner arm body.
A chain tensioner provided with a tensioner arm rockably supported by a fixed structure and relatively slidably engaged with an outside on a loose side of a transmission chain coupling a driving sprocket and a driven sprocket and a tensioner lifter supported by a fixed structure for pressing the end of the tensioner arm upon the loose side of the transmission chain, wherein the tensioner arm comprises:
- an elastic band tensioner arm body curved toward the transmission chain, the tensioner arm body being made of a spring steel plate;
- and
- a flexible tensioner shoe for covering a front of the tensioner arm body and being provided with a chain guide groove to a front wherein the transmission chain is slidably fitted;
- and
- at least one hole formed in a middle in the longitudinal direction of the tensioner arm body so that a natural oscillation frequency in the middle of the tensioner arm body is different from the natural oscillation frequency at each end of the tensioner arm body, thereby preventing resonance of the tensioner arm body.
A chain tensioner comprising:
- a tensioner arm relatively slidably engaged with a loose side of a transmission member for coupling a driving sprocket and a driven sprocket;
- and
- a tensioner lifter for pressing an end of the tensioner arm on the side of the transmission member;
- said tensioner arm comprising:
- an elastic band tensioner arm body curved toward the transmission member, the tensioner arm body being made of a spring steel plate;
- and
- a flexible tensioner shoe for covering a front of the tensioner arm body and having a guide groove wherein the transmission member is slidably fitted;
- and
- wherein a central portion in the longitudinal direction of the tensioner arm body has a smaller width relative to the width of each end of the arm body so that a natural oscillation frequency in the central portion of the tensioner arm body is different from the natural oscillation frequency at each of the ends of the tensioner arm body, thereby preventing resonance of the tensioner arm body.
Dependencies are inferred from the claim text.