US 12,270,470 B2
Tensioner for an accessory drive of a motor vehicle and accessory drive including such a tensioner
Mario Pennazza, Pescara (IT); and Ettore Ramin, Chieti (IT)
Assigned to MUVIQ S.R.L., Ivera (IT)
Appl. No. 18/003,937
Filed by DAYCO EUROPE S.R.L., Chieti (IT)
PCT Filed Jul. 1, 2021, PCT No. PCT/IB2021/055921
§ 371(c)(1), (2) Date Dec. 30, 2022,
PCT Pub. No. WO2022/003624, PCT Pub. Date Jan. 6, 2022.
Claims priority of application No. 102020000015877 (IT), filed on Jul. 1, 2020.
Prior Publication US 2023/0258247 A1, Aug. 17, 2023
Int. Cl. F16H 7/12 (2006.01); F16H 7/08 (2006.01)
CPC F16H 7/1245 (2013.01) [F16H 2007/0865 (2013.01); F16H 2007/0874 (2013.01); F16H 2007/0893 (2013.01); F16H 2007/0897 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A tensioner for an accessory drive of an internal combustion engine, the drive including at least a first pulley connected to a drive shaft of the engine, at least a second pulley connected to an electric machine and a belt wound at least on the first and second pulleys, the tensioner comprising:
a base configured to be fixed to a casing of the electric machine;
a first ring rotating with respect to the base about a first axis (A1);
a second ring rotating with respect to the first ring about a second axis (A2) distinct from the first axis (A1);
a first tensioning pulley carried by the first ring and rotating with respect to the first ring about its own axis (PA1);
a second tensioning pulley carried by the second ring and rotating with respect to the second ring about its own axis (PA2); and
an elastic member acting on the first and second rings to push the first and second tensioning pulleys into contact with respective spans of the belt,
wherein under nominal conditions a plane passing through the first and second axes (A1; A2) is inclined with respect to a bisector of a belt winding angle (0) on the second pulley by an angle (a) that is a function of the belt winding angle (0) on the second pulley according to the relation:
α=−0.21660+97.267+c,
where α and θ are expressed in degrees (°) and c is a variable comprised in the range between +10° and −10°.