# US 5,702,315 A · Autotensioner > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,702,315 A - Document ID: US5702315A - Status: Granted - Kind: A - Application number: 08/848,676 - Filed: 1997-04-29 - Granted: 1997-12-30 - Earliest claimed: 1993-08-04 - Assignees: Nsk Ltd. - Inventors: Kouichi Sakai; Hayato Oumi; Hiroshi Suzuki - Web page: https://patentgrep.com/patent/US5702315A ## CPC - F16H 7/1227: {of the viscous friction type, e.g. viscous fluid} - F02B 2275/18: DOHC [Double overhead camshaft] - F16H 2007/0806: {Compression coil springs} - F16H 2007/081: {Torsion springs} - F16H 2007/0859: {Check valves} - F16H 2007/0878: {Disabling during transport} - F16H 2007/0891: {Linear path} - F16H 2007/0893: {Circular path} - F16H: GEARING - F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G) ## Abstract An autotensioner for use in applying a tension to a moving belt, includes a bracket secured to an engine body and having a projection, a rocking member rockingly mounted to the bracket through a first axle and having an arm, a pulley rotatably mounted to the rocking member through a second axle for applying the tension to the moving belt, and a damper device provided between the projection of the bracket and the arm of the rocking member. ## Claims ### Claim 1 An autotensioner for use in applying a tension to a moving belt, comprising: a bracket attached to an engine body at a first position, a rocker member rockingly mounted to the bracket and having an arm, a rocker bearing section for pivotally mounting the rocker member to the bracket, the rocker bearing section comprising a cylindrical section, formed on the bracket and having an inner peripheral surface, a first pivot shaft having an outer peripheral surface and formed on the rocker member so as to be inserted into the cylindrical section, said first pivot shaft being formed on the rocker member at a second position displaced from said first position where the bracket is attached to the engine body, a sliding bearing provided between the outer peripheral surface of the first pivot shaft and the inner peripheral surface of the cylindrical section, a second pivot shaft provided in the rocker member, a pulley rotatably mounted to the rocker member through the second pivot shaft, and a damper device provided between the bracket and the rocker member. ### Claim 2 (depends on 1) The autotensioner of claim 1, wherein the bracket has two separate circular holes, and is fixed to the engine body with a bolt. ### Claim 3 An autotensioner for use in applying a tension to a moving belt, comprising: a fixed member attached to an engine body at a first position and having a projection, a rocker member rockingly mounted to the fixed member at a second position displaced from the first position where the fixed member is attached to the engine body and having an arm, a rocker bearing section for pivotally mounting the rocker member to the fixed mounting member, a pivot shaft provided in the rocker member, a pulley rotatably mounted to the rocker member through the pivot shaft, a biasing spring provided between the rocker member and the fixed member to apply a resilient force to the pulley so as to press the pulley against the belt, and a damper device provided between the projection of the fixed member and the arm of the rocker member. ### Claim 4 (depends on 3) The autotensioner of claim 3, wherein the fixed member has a lower edge portion which is formed with two separate circular holes, and is fixed to the engine body with a bolt. ### Claim 5 (depends on 3) The autotensioner of claim 3, wherein the rocking bearing section comprises a cylindrical section provided in the fixed member and having an inner peripheral surface, a displacement shaft having an outer peripheral surface, provided in the rocker member and inserted into the cylindrical section, and a sliding bearing provided between the outer peripheral surface of the displacement shaft and the inner peripheral surface of the cylindrical section. ### Claim 6 (depends on 5) The autotensioner of claim 5, wherein the biasing spring has a coil portion provided around the cylindrical section of the fixed member, a first end portion engaged with the fixed member and a second end portion engaged with the rocker member. ### Claim 7 An autotensioner for use in applying a tension to a moving belt comprising: a bracket having a projection and fixed to an engine body at a first position, a rocker member having an arm and rockingly mounted to the bracket at a second position displaced from said first position where the bracket is fixed to the engine body, a rocker bearing section rockingly mounting the rocker member to the bracket, the rocker bearing section comprising a cylindrical section having an inner peripheral surface provided in the bracket, a first pivot shaft having an outer peripheral surface, provided in the rocker member and inserted into the cylindrical section, and a sliding bearing provided between the outer peripheral surface of the first pivot shaft and the inner peripheral surface of the cylindrical section, a second pivot shaft provided in the rocker member, a pulley rotatably mounted to the rocker member through the second pivot shaft, a biasing spring provided between the rocker member and the bracket to apply a resilient force to the pulley to press the pulley against the belt, and a damper device provided between the projection of the bracket and the arm of the rocker member. ### Claim 8 (depends on 7) The autotensioner of claim 7, wherein the bracket has a lower edge portion formed with two separate holes and is fixed to the engine body with a bolt. ### Claim 9 (depends on 7) The autotensioner of claim 7, wherein the biasing spring has a coil portion provided around the cylindrical section of the bracket, a first end portion engaged with the bracket and a second end portion engaged with the rocker member.