US 11,692,520 B2
Fuel injector including valve seat plate having stress-limiting groove
Cory A. Brown, Peoria, IL (US)
Assigned to Caterpillar Inc., Peoria, IL (US)
Filed by Caterpillar Inc., Peoria, IL (US)
Filed on Aug. 11, 2020, as Appl. No. 16/990,398.
Application 16/990,398 is a division of application No. 15/684,271, filed on Aug. 23, 2017, granted, now 10,781,777.
Prior Publication US 2020/0370522 A1, Nov. 26, 2020
Int. Cl. F02M 47/02 (2006.01); F02M 51/06 (2006.01); F02M 55/00 (2006.01); F02M 61/20 (2006.01); F02M 61/04 (2006.01)
CPC F02M 51/0632 (2013.01) [F02M 47/027 (2013.01); F02M 51/0628 (2013.01); F02M 55/004 (2013.01); F02M 55/008 (2013.01); F02M 61/045 (2013.01); F02M 61/20 (2013.01); F02M 2200/28 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A valve seat plate for a fuel injector comprising:
a disc-shaped body defining a center axis and having an outer peripheral surface extending circumferentially around the center axis and axially between a first side and a second side of the disc-shaped body;
the disc-shaped body defining a nozzle supply passage and a pressure control passage each extending through the disc-shaped body between the first side and the second side;
a valve seat is formed on the first side of the disc-shaped body and is fluidly connected to the pressure control passage;
a stress-limiting groove is formed in the first side and extends circumferentially around the valve seat at a location radially outward of the valve seat and radially inward of the nozzle supply passage;
the stress-limiting groove including a radially inward groove surface defining a first circle having a constant curvature 360 degrees around the center axis, and a radially outward groove surface defining a second circle having a constant curvature 360 degrees around the center axis; and
the disc-shaped body further including an end surface upon the first side oriented normal to the center axis and extending from the stress-limiting groove to the outer peripheral surface.