Support structure of direct fuel injection valve
View Patent ↗In a support structure of a direct fuel injection valve capable of supporting a fuel injection valve stably for a long period of time, a valve housing is made of a metal and is provided with a first load bearing portion which is to be supported by an engine in an axial direction of the valve housing, a rear end portion of the fixed core is provided with a second load bearing portion which is to be supported by a resilient holding member in the axial direction, and the first and second load bearing portions are held between the engine and the resilient holding members with a forward set load applied to the resilient holding member by a fuel distribution pipe fitted to a fuel inlet tube and fixed to the engine.
1. A support structure of a direct fuel injection valve comprising:
a valve housing including a valve seat at a front end thereof;
a yoke portion;
a fixed core made of a metal and provided to be connected to a rear end of the valve housing;
a fuel inlet tube continued from a rear end of the fixed core;
a movable core opposed to an attraction surface of a front end of the fixed core;
a coil provided around an outer periphery of the fixed core;
a valve body housed in the valve housing and configured to operate in cooperation with the valve seat;
a coil housing that houses the coil therein; and
a cover layer made of a synthetic resin and formed by molding to extend from the coil housing to a part of the fixed core, the cover layer being integrally formed with a coupler,
in which the fuel injection valve is configured such that in a state installed on a cylinder head of an engine, a fuel is directly injected to a combustion chamber of the engine when the valve body is opened with the coil energized to cause the fixed core to attract the movable core, wherein
the yoke portion is made of a metal and is provided with a first load bearing portion, the first load bearing portion being not covered by the cover layer and configured to be supported by the cylinder head of the engine in an axial direction of the valve housing,
the fixed core has a rear end portion which is not covered by the cover layer, the rear end portion being provided with a second load bearing portion not covered by the cover layers, the second load bearing portion having a planar portion which is configured to be abutted by and support in the axial direction, a resilient holding member which comprises a leaf spring, and
the resilient holding member is provided between the second bearing portion and a fuel distribution pipe which is fitted to the fuel inlet tube and fixed to the cylinder head of the engine, and thus the first and second load bearing portions are held between the cylinder head of the engine and the resilient holding member, so that the resilient holding member applies a forward set load to the first and second bearing portions.
2. The support structure of a direct fuel injection valve according to claim 1 , wherein the first load bearing portion is supported on the cylinder head of the engine with a cushion member interposed therebetween.