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US 4,934,987 AGranted
Belt tensioner
AssigneesKoyo Seiko Co., Ltd., Mitsubishi Jidosha Kogyo Kabushiki Kaisha
InventorsYasushi Kadota, Sadakatsu Ushio
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AssigneesKoyo Seiko Co., Ltd., Mitsubishi Jidosha Kogyo Kabushiki Kaisha
InventorsYasushi Kadota, Sadakatsu Ushio
Estimating the term…
A belt tensioner comprising an intermediate annular member rotatably provided around a fixed member in the form of a solid cylinder and to be secured to a stationary portion, a movable eccentric member in the form of a solid cylinder and rotatably provided around the intermediate annular member eccentrically therewith, an idler in the form of a hollow cylinder and rotatably provided around the movable eccentric member for contact with a belt, and a spring provided between the stationary portion or the fixed member and the movable eccentric member for biasing the movable eccentric member in a direction to bring the idler into pressing contact with the belt. The intermediate annular member has a cylindrical or tapered first sliding surface in contact with the fixed member and a cylindrical or tapered second sliding surface in contact with the eccentric member. One of the first and second sliding surfaces of the annular member is a high-friction sliding surface, and the other surface is a low-friction sliding surface. An oil of high viscosity is provided between the low-friction sliding surface and the surface of the fixed member or the eccentric member in contact therewith.
A belt tensioner comprising an intermediate annular member rotatably provided around a fixed member in the form of a solid cylinder and to be secured to a stationary portion, a movable eccentric member in the form of a solid cylinder and rotatably provided around the intermediate annular member eccentrically therewith, an idler in the form of a hollow cylinder and rotatably provided around the movable eccentric member for contact with a belt, and a spring provided between the stationary portion or the fixed member and the movable eccentric member for biasing the movable eccentric member in a direction to bring the idler into pressing contact with the belt, the intermediate annular member having a cylindrical or tapered first sliding surface in contact with the fixed member and a cylindrical or tapered second sliding surface in contact with the movable eccentric member, one of the first and second sliding surfaces of the intermediate annular member being a high-friction sliding surface, the other sliding surface being a low-friction sliding surface, an oil of high viscosity being provided between the low-friction sliding surface and the surface of the fixed member or the movable eccentric member in contact therewith.
Dependencies are inferred from the claim text.