US 11,732,774 B2
Combined isolation and torsional vibration damping device
Sean Kieran, Woodbridge (CA); Ahmed Abdul Wadood Anwer, Toronto (CA); Geoffrey William Ryeland, North York (CA); Ron Farewell, Mississauga (CA); Kyle Pugsley, Woodbridge (CA); Frank Verriet, Woodbridge (CA); and Andrew Malcolm Boyes, Aurora (CA)
Assigned to LITENS AUTOMOTIVE PARTNERSHIP, Woodbridge (CA)
Appl. No. 17/273,206
Filed by Litens Automotive Partnership, Woodbridge (CA)
PCT Filed Sep. 10, 2019, PCT No. PCT/CA2019/051277
§ 371(c)(1), (2) Date Mar. 3, 2021,
PCT Pub. No. WO2020/051694, PCT Pub. Date Mar. 19, 2020.
Claims priority of provisional application 62/889,558, filed on Aug. 20, 2019.
Claims priority of provisional application 62/729,224, filed on Sep. 10, 2018.
Prior Publication US 2021/0324937 A1, Oct. 21, 2021
Int. Cl. F16F 15/126 (2006.01); F16D 3/12 (2006.01); F16D 3/80 (2006.01); F16D 13/76 (2006.01); F16D 37/00 (2006.01); F16D 37/02 (2006.01); F16H 7/20 (2006.01); F16H 55/36 (2006.01)
CPC F16F 15/126 (2013.01) [F16D 3/12 (2013.01); F16D 3/80 (2013.01); F16D 13/76 (2013.01); F16D 37/008 (2013.01); F16D 37/02 (2013.01); F16H 7/20 (2013.01); F16H 55/36 (2013.01); F16D 2300/22 (2013.01); F16F 2224/045 (2013.01); F16F 2238/04 (2013.01); F16H 2055/366 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A combined isolation and torsional vibration damping device for a driven shaft that receives an input torque that varies cyclically between a peak input torque and a low input torque at a peak input torque frequency, comprising:
a shaft adapter that is connectible to the driven shaft, wherein the shaft adapter defines an axis;
a rotary drive member that is rotatably connected to the shaft adapter, wherein the rotary drive member has an exterior drive surface that is engageable with an external torque load so as to transmit torque to the external torque load, and wherein the rotary drive member at least partially encloses a chamber;
at least one isolation member positioned to transfer torque between the shaft adapter and the rotary drive member, wherein the at least one isolation member has an isolation member stiffness that is selected such that a natural frequency of a system made up of the external torque load and all portions of the combined isolation and torsional vibration damping device which transmit torque from the shaft adapter to the external torque load, is lower than the peak input torque frequency; and
a torsional vibration damping structure that includes an inertia member that is entirely contained in the chamber and an elastomeric damping member positioned to elastically connect the shaft adapter and the inertia member; wherein a stiffness of the elastomeric damping member and an inertia of the inertia member provide the torsional vibration damping structure with a natural frequency that is at least 50% of the natural frequency of the driven shaft,
wherein the chamber contains a damping fluid, and wherein the inertia member has a damping fluid engagement surface that travels through the damping fluid during relative movement between the rotary drive member and the shaft adapter so as to cause viscous damping between the inertia member and the rotary drive member,
and wherein a viscosity of the damping fluid, an inertia of the inertia member, and a stiffness of the elastomeric damping member are selected such that, during use of the driven shaft, a sum of torques applied to the shaft adapter from a plurality of torque sources including a torque from viscous damping from movement of the inertia member through the damping fluid, a torque from viscous damping within the elastomeric damping member, a torque from elastic deformation of the elastomeric damping member, and a torque from inertia in the inertia member, opposes a torque applied to the shaft adapter from the driven shaft at a natural frequency of the driven shaft with the combined isolation and torsional vibration damping device thereon and limits a maximum twist between a first end of the driven shaft and a second end of the driven shaft, to below a yield point of the driven shaft.