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1. (WO2017155809) GALLERYLESS PISTON WITH CUTOUT ABOVE PIN BORE

Pub. No.:    WO/2017/155809    International Application No.:    PCT/US2017/020638
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Sat Mar 04 00:59:59 CET 2017
IPC: F02F 3/22
F02B 23/06
F02F 3/26
F01P 3/06
F02F 3/00
F01P 3/08
Applicants: FEDERAL-MOGUL LLC
Inventors: WEINENGER, Michael
RIFFE, Jeffrey, L.
Title: GALLERYLESS PISTON WITH CUTOUT ABOVE PIN BORE
Abstract:
A galleryless piston having a reduced weight and a reduced operating temperature is provided. The piston includes an undercrown surface exposed from an underside of the piston, a ring belt, pin bosses each presenting a pin bore, and skirt panels depending from the ring beit and coupled to the pin bosses by strut. The piston further includes an inner undercrown region extending along the undercrown surface and surrounded by the skirt panels, the struts, and the pin bosses. The piston also includes outer pockets each extending along the undercrown surface and each surrounded by a portion of the ring belt, one of the pin bosses, and the struts coupling the one pin boss to the skirt panels. Cutouts are located in the pin bosses above the pin bores to increase the area of the undercrown surface and thus allow cooling oil to remove more heat from the undercrown surface.