Mechanical chain tensioner

摘要

A tensioner 10 comprises a resin tensioner arm 11 and a torsional coil spring 14. The tensioner arm 11 is rotatably supported on a bolt 12 that is fixed on the engine block 30. The torsional coil spring 14 is provided around a flanged bolt 13 fixed on the engine block 30 and biases the tensioner arm 11 in such a way that the tensioner arm 11 swings toward the chain 6. On the bottom surface of a recessed portion 11a of the tensioner arm 11 is attached a metallic plate 15 that is in contact with the leg portions 14a and 14b of the torsional coil spring 14. <IMAGE>