US 12,281,626 B1
Piston body for an engine having surface features for interacting with boundary layer
Kevin Michael Van de Voorde, Cincinnati, OH (US); Victor Luis Marrero Ortiz, Humacao, PR (US); and Joshua Tyler Mook, Cincinnati, OH (US)
Assigned to Hyliion Holdings Corp., Cedar Park, TX (US)
Filed by Hyliion Holdings Corp, Cedar Park, TX (US)
Filed on Jul. 12, 2024, as Appl. No. 18/771,335.
Int. Cl. F02F 3/00 (2006.01); F02F 3/02 (2006.01); B33Y 80/00 (2015.01)
CPC F02F 3/02 (2013.01) [B33Y 80/00 (2014.12)] 20 Claims
OG exemplary drawing
 
1. A linear electric machine, comprising:
a shaft;
at least one piston assembly operably coupled with the shaft, the at least one piston assembly comprising a piston, a piston body, and an expansion chamber, the piston body defining a dome structure at the expansion chamber, the piston being a domed piston corresponding to the dome structure; and
a heater body positioned at an outer end of the expansion chamber adjacent to the dome structure,
wherein the piston body further defines an exterior surface corresponding to a shape of the dome structure, the exterior surface comprising a plurality of surface features protruding therefrom and being arranged between the heater body and the dome structure, and
wherein the plurality of surface features decrease a heat load across the exterior surface of the piston body.