US 11,668,271 B1
Mechanically actuated fuel injector system, method, and assembly having helper spring
Abram M. Ingold, Metamora, IL (US); Vasudev Koppram, Chennai (IN); and Xuefeng Song, Edwards, IL (US)
Assigned to Caterpillar Inc., Peoria, IL (US)
Filed by Caterpillar Inc., Peoria, IL (US)
Filed on Apr. 19, 2022, as Appl. No. 17/723,492.
Int. Cl. F02M 63/00 (2006.01); F16K 31/524 (2006.01)
CPC F02M 63/0014 (2013.01) [F16K 31/52408 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A mechanically actuated fuel injector system comprising:
an upper support;
a set of arms supported by the upper support and individually rotatable around a shaft, the set of arms including an injector arm between a first rocker arm and a second rocker arm;
a lower support spaced from the upper support;
a set of pushrods respectively operatively coupled to the set of arms, the set of pushrods including an injector pushrod between a first valve pushrod and a second valve pushrod;
a set of cam followers respectively operatively coupled to the set of pushrods, the set of cam followers including an injector cam follower between a first cam follower associated with the first valve pushrod and a second cam follower associated with the second valve pushrod;
a hold down clamp extending from the upper support, the hold down clamp having an opening extending therethrough, the injector pushrod extending through the opening;
a helper spring around the injector pushrod, between the hold down clamp and the lower support;
a retention seat circumscribing the injector pushrod, a lower end of the helper spring being seated in the retention seat; and
a spacer between the hold down clamp and the helper spring, an upper end of the helper spring abutting a lower end of the spacer, and an upper end of the spacer abutting a lower surface of the hold down clamp.