公开(公告)号：US11708810B1

公开(公告)日：2023-07-25

申请号：US17745970

申请日：2022-05-17

Applicant: Caterpillar Inc.

Inventor： Manjunath Bannur Nagaraja ,  Zhenyu Li ,  Benjamin R Tower ,  Aniket Suresh Dighe

IPC: F02M53/04 ,  F02M55/02 ,  F02M47/02 ,  F02M37/00

CPC classification number: F02M53/043 ,  F02M37/0017 ,  F02M37/0052 ,  F02M47/027 ,  F02M55/02 ,  F02M2700/077

Abstract: An engine head assembly includes a double-walled fuel connector assembly in an engine head and forming a high-pressure fuel supply passage and a low-pressure fuel return passage. The engine head assembly also includes a fuel injector. A high-pressure fuel inlet path extends between a fuel inlet and spray orifices through an injector body in the fuel injector. A low-pressure cooling fuel outlet path extends between an injection control valve seat in the fuel injector and a cooling fuel outlet in a nozzle case of the fuel injector. Expelled cooling fuel is passed through the low-pressure fuel return passage in the double-walled fuel connector.