公开(公告)号：US20140346254A1

公开(公告)日：2014-11-27

申请号：US14453646

申请日：2014-08-07

Applicant: Caterpillar Inc.

Inventor： Dana R. Coldren ,  Alan R. Stockner ,  David T. Montgomery

IPC: F02M67/10 ,  F02M67/14

CPC classification number: F02M55/002 ,  F02D19/0694 ,  F02M43/04 ,  F02M47/027 ,  Y02T10/36

Abstract: A fuel injector comprises a liquid fuel cavity and a gas fuel cavity disposed within an injector cavity housing a liquid needle valve stem and a gas needle valve stem, respectively. The gas needle valve stem includes a guide stem portion distal to the injector tip and a check proximal to the injector tip. A drain passage terminates in a drain annulus groove disposed in a guide cavity wall of a gas valve guide cavity. The gas valve guide cavity houses the guide stem portion defining a clearance between the guide cavity wall below the drain annulus groove and the guide stem portion. The liquid fuel from the drain passage flows to the gas needle valve stem and an inner surface of the gas fuel cavity, through the clearance. The liquid fuel drained through the clearance collects in a plurality of grooves on the check.

Abstract translation: 燃料喷射器包括液体燃料腔和设置在分别容纳液体针阀杆和气针阀杆的注射器腔内的气体燃料腔。 气针阀杆包括远离喷射器尖端的导杆部分和靠近喷射器尖端的支架。 排水通道终止于设置在气阀导向腔的引导腔壁中的排水环形槽。 气阀导向腔容纳导向杆部分，该导向杆部分在排水环形槽下方的引导腔壁与引导杆部分之间形成间隙。 来自排水通道的液体燃料通过间隙流到气针阀杆和气体燃料腔的内表面。 通过间隙排出的液体燃料收集在支票上的多个凹槽中。