Support structure for fuel injection valve
View Patent ↗In a fuel injection valve support structure which can apply a substantially constant set load, the fuel injection valve has first and second load receiving portions, the first load receiving portion being supported on the engine, the second load receiving portion being supported on an elastic support member which receives a set load from a fuel supply cap. The elastic support member includes a base plate placed on the second load receiving portion, and an elastic piece curving rearward from one end toward the other end of the base plate, with an apex portion in pressure contact with the cap, the base plate has a portion overhanging from the second load receiving portion and supporting a tip end portion of the elastic piece. The overhang portion starts bending when a load the overhang portion receives from the cap through the elastic piece reaches or exceeds a predetermined value.
1. A support structure for a fuel injection valve in which a nozzle part in a front end section of the fuel injection valve is fitted in an injection-valve mounting hole in an engine, and a fuel supply cap of a fuel distribution tube supported on the engine is fitted on a fuel introducing part in a rear end section of the fuel injection valve, the fuel injection valve having a first load receiving portion and a second load receiving portion along an axial direction thereof, the first load receiving portion being supported on the engine, the second load receiving portion being supported on an elastic support member which receives a set load from the fuel supply cap, wherein
the elastic support member includes a base plate placed on the second load receiving portion, and an elastic piece curving rearward from one end of the base plate and extending toward an opposite end of the base plate, and having an apex portion thereof in pressure contact with a front end surface of the fuel supply cap,
the base plate has an overhang portion overhanging from the second load receiving portion and supporting a tip end portion of the elastic piece, the support structure configured such that the overhang portion is always kept in abutment against the tip end portion of the elastic piece, and
the overhang portion is configured to start bending when a load the overhang portion receives from the fuel supply cap through the tip end portion of the elastic piece reaches or exceeds a predetermined value.
2. The support structure for a fuel injection valve according to claim 1 , wherein in the overhang portion, a narrow portion is formed near the second load receiving portion so that the bending occurs at the narrow portion.
3. A support structure comprising an elastic support member for supporting a fuel injection valve on an engine, in which a nozzle part in a front end section of the fuel injection valve is fitted in an injection-valve mounting hole in the engine, and a fuel supply cap of a fuel distribution tube supported on the engine is fitted on a fuel introducing part in a rear end section of the fuel injection valve, the fuel injection valve having a first load receiving portion and a second load receiving portion along an axial direction thereof, the first load receiving portion being supported on the engine, and the second load receiving portion being supported on the elastic support member which receives a load from the fuel supply cap, wherein:
the elastic support member includes a base plate configured to be placed on the second load receiving portion, and an elastic piece curving rearward from one end of the base plate and extending toward another end of the base plate, and having an apex portion thereof in pressure contact with a front end surface of the fuel supply cap,
the base plate has an overhang portion overhanging from the second load receiving portion, the overhang portion abuttingly contacting and supporting a tip end portion of the elastic piece, the support structure configured such that the overhang portion is always kept in abutment against the tip end portion of the elastic piece, and
a part of the base plate proximate the overhang portion is configured to start bending when a load the overhang portion receives from the fuel supply cap, through the elastic piece, reaches or exceeds a predetermined value.
4. The support structure for the fuel injection valve according to claim 3 , wherein in the part of the base plate proximate the overhang portion, a narrow portion is formed near the second load receiving portion, the narrow portion being narrower than the overhang portion of the base plate so that the bending occurs at the narrow portion.
5. The support structure for the fuel injection valve according to claim 3 , wherein the elastic support member further comprises a positioning piece integrally attached to and extending rearwardly from the base plate for contacting a side portion of the fuel supply cap.
6. The support structure for the fuel injection valve according to claim 3 , wherein the elastic support member further comprises a pair of rotation locking pieces for engaging opposite sides of the fuel injection valve, the rotation locking pieces extending forwardly from opposite sides of the base plate.