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US 12,460,613 B2Granted
Engine device including an orientation of a fuel return line attached to a common rail
AssigneeYanmar Power Technology Co., Ltd.
InventorsKohei Tsushima, Masataka Uchibori
Life of this patent
Estimating the term…
Abstract
An engine device including a common rail configured to store, at a high pressure, a fuel supplied by a fuel feed pump. The common rail includes a pressure reducing valve configured to discharge the fuel in the common rail to a fuel return pipe. The fuel return pipe extends from the pressure reducing valve to a position higher than the pressure reducing valve, and then extends to a position lower than the pressure reducing valve.
Claims19
An engine device comprising:
- a cylinder head;
- a crankshaft;
- a common rail configured to store, at a high pressure, a fuel supplied by a fuel feed pump, wherein the fuel feed pump has a first side and a second side, wherein the second side is disposed between the first side and the common rail in a direction of a line perpendicular to a longitudinal direction of the common rail, wherein the line extends through both the cylinder head and the crankshaft;
- and
- a fuel return pipe connected to the common rail and configured to return fuel in the common rail to the fuel feed pump,
- wherein the fuel return pipe is directly connected to the fuel feed pump at a connection point that is located between the first side of the fuel feed pump and the common rail in the direction of the line.
3 more elements
An engine device comprising:
- a fuel feed pump;
- a common rail configured to store, at a high pressure, a fuel supplied by the fuel feed pump;
- a fuel feed pipe connected to the fuel feed pump and configured to supply fuel in the fuel feed pump to the common rail;
- a fuel return pipe connected to the fuel feed pump at a separate connection point than the fuel feed pipe is connected and configured to return fuel in the fuel feed pump to a connector coupled to the common rail;
- a second fuel return pipe connected to the common rail and configured to return fuel in the common rail to the fuel feed pump;
- and
- a third fuel return pipe connected to the common rail and configured to return fuel in the common rail to a fuel tank.
4 more elements
An engine device comprising:
- a fuel feed pump connected to a fuel tank through a fuel supply pipe;
- a common rail configured to store, at a high pressure, a fuel supplied by the fuel feed pump;
- a pressure reducing valve coupled to a first end of the common rail and having a first side configured to receive the fuel from the common rail;
- a fuel return pipe that is distinct from the common rail and configured to return fuel in the common rail to the fuel feed pump, wherein the fuel return pipe is coupled to a second side of the pressure reducing valve via a first end of the fuel return pipe such that the fuel is discharged from the common rail into the first end of the fuel return pipe, and the fuel return pipe is connected to the fuel feed pump at a connection point that is located below the common rail without being connected to the fuel supply pipe;
- and
- a second fuel return pipe that is distinct from the common rail, wherein a first end of the second fuel return pipe is coupled to the fuel feed pump such that fuel is discharged from the fuel feed pump into the first end of the second fuel return pipe, and wherein a second end of the second fuel return pipe is coupled to a connector coupled to the common rail at a second end of the common rail opposite the first end of the common rail such that fuel is discharged from the second end of the second fuel return pipe into the connector.
3 more elements
Dependencies are inferred from the claim text.