Engine

摘要

It is an object of the present invention to provide an engine which can easily be produced. In an engine including an electronic throttle device, a control unit for controlling the electronic throttle device, and a gas fuel supply unit, a gaseous-fuel mixer is used as the gas fuel supply unit, and when an extending direction of a crankshaft is defined as a longitudinal direction and an engine cooling fan is defined as existing on a front side and a side opposite from the front side is defined as a rear side, a collector of an intake manifold extends in the longitudinal direction, the electronic throttle device is mounted on the rear side of the collector, and the gaseous-fuel mixer is mounted on the rear side of the electronic throttle device.

主权项

1. An engine comprising,
an electronic throttle device including a throttle suction passage and a butterfly throttle valve having a laterally extending throttle valve shaft, a control unit for controlling the electronic throttle device, a gaseous fuel supply unit, a gaseous-fuel mixer is used as the gaseous fuel supply unit, including a venturi passage and a gaseous fuel inlet facing the venturi passage, a crankshaft defining a longitudinal direction in an extending direction thereof, an engine cooling fan positioned on a front side of the engine in the longitudinal direction and a side opposite from the front side being a rear side, and a collector of an intake manifold extending in the longitudinal direction, wherein
the electronic throttle device is mounted rearwardly of the collector,the gaseous-fuel mixer is mounted rearwardly of the electronic throttle device,the venturi passage and the throttle suction passage are connected to each other in series in the longitudinal direction,the gaseous fuel inlet is downwardly provided in a ceiling wall of the venturi passage,a plurality of branch portions of the intake manifold are downwardly led out from a lower surface of the collector,a front end wall of the collector projects forward of a front end wall of a front-most one of the branch portions, andan inner surface of a front end lower corner of the collector, connecting the front end wall of the collector and the front end wall of the front-most branch portion is curvedly shaped, a tangent of said curved shape gradually approaching horizontal as the curved shape approaches the front end wall of the front-most branch portion from the front end wall of the collector.