Patent DE-60207239-C5 (DE)
Title: Direkt betätigtes einspritzventil
Inventor: WELCH ALAN
IPC: F02M63/00
Filed: 2002-05-17
Granted: 2017-12-28
Abstract: An injection valve (100) for injecting fuel into a combustion chamber of an internal combustion engine, said injection valve (100) comprising: • (a) a valve housing (102) comprising: – a fuel inlet port (108, 208); – an interior chamber fluidly connected to said fuel inlet port (108, 208); and – a valve seat (112) for cooperating with a valve member (114, 314) to seal said interior chamber from said combustion chamber when said injection valve (100) is closed; • (b) said valve member (114, 314) having one end disposed within said valve housing (102) and an opposite end extendable from said valve seat (112) toward said combustion chamber, wherein said valve member (114, 314) comprises a sealing surface that fluidly seals against said valve seat (112) when said injection valve (100) is closed and that is liftable away from said valve seat (112) when said injection valve (100) is open; • (c) a biasing mechanism associated with said valve member (114, 314), said biasing mechanism comprising a valve spring (116) and a disk spring (150) for applying a compressive force to said dimensionally responsive member, said biasing mechanism applying a closing force that originates from said valve spring (116) and said disk spring (150) to said valve member (114, 314) when said valve member (114, 314) is in said closed position; • (d) an actuator assembly associated with said valve member (114, 314), wherein said actuator assembly comprises a dimensionally responsive solid member that is actuable to apply an opening force to said valve member (114, 314) stronger than said closing force, for moving said valve member (114, 314) to said open position; and • (e) a hydraulic link assembly comprising a passive hydraulic link having a hydraulic fluid thickness through which said opening and closing forces are transmitted, whereby said hydraulic fluid acts substantially as a solid with said thickness being substantially constant while said actuator assembly is actuated and wherein said thickness of said hydraulic link is adjustable while said actuator assembly is not actuated in response to changes in the dimensional relationship between components of said injection valve (100) to maintain a desired valve lift upon actuation of said actuator assembly, wherein said hydraulic link assembly is disposed within said interior chamber, wherein said hydraulic link assembly comprises a fluidly sealed hydraulic cylinder (160) that is fluidly sealed from said interior chamber, said hydraulic link assembly comprising a piston (114b, 314b) and said hydraulic fluid being disposed within said hydraulic cylinder (160), wherein said passive hydraulic link is configured to be adjustable by allowing movement of hydraulic fluid from a first chamber on a first side of the piston (114b, 314b) to a second chamber on a second, opposite side of the piston (114b, 314b) while said actuator assembly is not actuated, and wherein said hydraulic cylinder (160) is configured to be moveable relative to the valve housing, wherein said disk spring (150) bears against said hydraulic cylinder (160) and said valve spring (116) bears directly against said piston (114b) to transmit a closing force directly to said valve member (114).