Patent ID: 6955156
Filing Date: 2005-10-18
Classification: F02M

Abstract:
1. An injection pump of a dimethyl ether (DME) fuel supply device for a diesel engine having a feed pump for pressurizing DME fuel in a fuel tank to a specified pressure and delivering it into a feed pipe, an injection pump having an injection pump element with a delivery valve which can be opened and closed by up and down movement of a plunger in engagement with a camshaft rotated by rotation transmitted from a driving shaft of said diesel engine and which can deliver DME fuel in a fuel gallery delivered via said feed pipe in a specified amount to an injection pipe communicated to a fuel injection nozzle of said diesel engine at specified timing, an overflow fuel pipe for returning DME fuel overflowed from said fuel injection nozzle and DME fuel overflowed from said injection pump to said fuel tank, and residual fuel retrieving means for retrieving DME fuel remaining in said fuel gallery and said overflow fuel pipe after stopping said diesel engine to said fuel tank, said injection pump comprising injection state switching means for switching said injection pump element between an injection state in which said delivery valve is opened and closed by a cam of said camshaft and a non-injection state in which said delivery valve is not opened and closed even when said plunger is moved up and down by said cam, wherein said injection pump element allows communication between said injection pipe and said fuel gallery even if said delivery valve is closed only in said non-injection state.