F - Mech Eng,Light,Heat,Weapons – 16 – H
Patent
F - Mech Eng,Light,Heat,Weapons
16
H
74/261
F16H 7/08 (2006.01) F16H 7/12 (2006.01)
Patent
CA 2001709
Tensioners for a power transmission belt to be operated in an endless path, and methods of making them, as well as anti-friction disc-like members for such tensioners and methods of making them, are provided herein. The tensioner includes a support unit for being fixed relative to the belt. A belt-engaging unit is carried by the support unit and is movable relative thereto. A first spring urges the belt-engaging unit relative to the support unit and against the belt with a force to tension the belt. A frictional dampening unit dampens the movement of the belt-engaging unit relative to the support unit in at least one direction of movement thereof. The dampening unit has a longitudinal axis and includes a pair of frictionally-engaging, first and second parts, with the first part comprising an annular pad of friction material that is coaxially disposed and is axially movable on the shaft relative to the second part. A second spring urges the first part against the second part with a certain spring force. The support unit includes a shaft having a longitudinal axis which is fixed from movement relative to the belt-engaging unit. The belt-engaging unit has a portion thereof which is rotatably carried by the shaft so as to rotate relative to the shaft. The tensioner has an antifriction annular disc-like member which is disposed on the shaft between the first spring and one of the support unit or belt-engaging unit. The first part of the dampening unit has a guide thereon. One of the support unit and the belt-engaging unit has an opening therein that receives the guide therein to guide axial movement of the first part. The tensioner has a bearing which is disposed in the opening and receiving the guide therein. The antifriction disc-like member carries the bearing on one side thereof.
Borden Ladner Gervais Llp
Dayco Products Inc.
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