Fuel supply structure in vehicle engine

Patent metadata

Field	Value
Publication number	US-9482197-B2
Application number	US-201514588554-A
Country	US
Kind code	B2
Filing date	Jan 2, 2015
Priority date	Jan 8, 2014
Publication date	Nov 1, 2016
Grant date	Nov 1, 2016

Abstract

A main fuel injection valve and a secondary fuel injection valve are separately housed in a purified chamber and an unpurified chamber of an air cleaner. A common fuel supply conduit for leading fuel from a fuel tank is connected to a branching connection pipe which is supported to pass through a cleaner case and a bulkhead and which is placed in one of the unpurified chamber and the purified chamber 49 . The branching connection pipe is connected to a main fuel injection valve side branched fuel conduit and a secondary fuel injection valve side branched fuel conduit.

First claim

The invention claimed is:

1. A fuel supply structure in a vehicle engine, said fuel supply structure comprising:
an air cleaner configured to be divided in a cleaner case by a bulkhead, said bulkhead holding a cleaner element in an unpurified chamber and a purified chamber;
a main fuel injection valve configured to inject fuel into an intake passage that enables communication between an intake port provided in a cylinder head of an engine body and the purified chamber; and
a secondary fuel injection valve configured to inject fuel into the intake passage on an upper side relative to the main fuel injection valve in a flow direction in the intake passage,
wherein one of the main fuel injection valve and the secondary fuel injection valve is housed in the purified chamber, wherein another of the main fuel injection valve and the secondary fuel injection valve is housed in the unpurified chamber, wherein a common fuel supply conduit configured to lead fuel from a fuel tank to the main fuel injection valve and the secondary fuel injection valve in common is connected to a branching connection pipe which is supported to pass through the cleaner case and the bulkhead and which is disposed in one of the unpurified chamber and the purified chamber, and wherein the branching connection pipe is connected to a main fuel injection valve side branched fuel conduit configured to lead fuel toward the main fuel injection valve side and to a secondary fuel injection valve side branched fuel conduit for leading fuel toward the secondary fuel injection valve side.

2. The fuel supply structure in a vehicle engine according to claim 1 , wherein the branching connection pipe includes a pair of branched pipe portions disposed in the unpurified chamber, and wherein one of the branched pipe portions passes through the bulkhead and is supported by the bulkhead to open on a purified chamber side.

3. The fuel supply structure in a vehicle engine according to claim 2 , wherein a lower case half body and an upper case half body, being dividable vertically, are combined to constitute the cleaner case, and wherein the branching connection pipe which is disposed in the unpurified chamber defined between the bulkhead and the lower case half body passes through the lower case half body and is connected to the common fuel supply conduit.

4. The fuel supply structure in a vehicle engine according to claim 2 , wherein the branched pipe portion on one side possessed by the branching connection pipe and opening on the purified chamber side is connected by a quick connector to the branched fuel conduit which, of the main fuel injection valve side branched fuel conduit and the secondary fuel injection valve side branched fuel conduit, is disposed in the purified chamber.

5. The fuel supply structure in a vehicle engine according to claim 2 , wherein annular elastic seal members are respectively interposed between the branching connection pipe, and the cleaner case and the bulkhead.

6. The fuel supply structure in a vehicle engine according to claim 1 , wherein at least a part of the intake passage making communication between the purified chamber and the intake port comprises an air funnel opening to the purified chamber and a throttle body disposed in the unpurified chamber and connected to a downstream end part of the air funnel.

7. The fuel supply structure in a vehicle engine according to claim 6 , wherein at least two throttle bodies are separated in the vehicle front-rear direction and are disposed in the unpurified chamber, and are mutually coupled by a bracket disposed on a lateral side of the at least two throttle bodies, and wherein a joint member connecting the main fuel injection valve side branched fuel conduit to a main fuel injection valve side fuel supply pipe which is connected to the main fuel injection valves respectively annexed to the throttle bodies is disposed to pass through the bracket.

8. The fuel supply structure in a vehicle engine according to claim 7 , wherein the bracket includes a connecting plate portion which is fastened to the at least two throttle bodies separated in the vehicle front-rear direction and which is provided with a perforated aperture making the joint member pass therethrough, a first boss portion which is disposed on the throttle bodies side with respect to the connecting plate portion and which is consecutively connected to either one of front and rear parts of the connecting plate portion to be fastened to a lower part of the cleaner case, and a second boss portion which is disposed on an opposite side to the throttle bodies with respect to the connecting plate portion and which is consecutively connected to the other of the front and rear parts of the connecting plate portion to be fastened to the cleaner case and wherein the joint member and the first boss portion are disposed to at least partially overlap as viewed in a plan view.

9. The fuel supply structure in a vehicle engine according to claim 6 , wherein the branching connection pipe is disposed at a position where, as viewed laterally, it overlaps a part of the throttle body on a rear side of the throttle bodies separated in the vehicle front-rear direction, and wherein an electric motor configured to generate a power to drivingly turn throttle valves respectively provided in the throttle bodies is housed in the unpurified chamber to be placed ahead of the throttle body on a front side of the at least two throttle bodies separated in the vehicle front-rear direction.

10. A fuel supply structure in a vehicle engine, said fuel supply structure comprising:
air cleaner means for cleaning air, said air cleaner means being divided in a cleaner case means by a bulkhead, said bulkhead holding cleaner element means in an unpurified chamber and a purified chamber;
main fuel injecting means for injecting fuel into an intake passage that enables communication between an intake port in a cylinder head of an engine body and the purified chamber;
secondary fuel injection means for injecting fuel into the intake passage on an upper side relative to the main fuel injection means in a flow direction in the intake passage,
wherein one of the main fuel injection means and the secondary fuel injection means is housed in the purified chamber, wherein another of the main fuel injection means and the secondary fuel injection means is housed in the unpurified chamber, wherein a common fuel supply means for leading fuel from a fuel tank to the main fuel injection means and the secondary fuel injection means in common is connected to a branching connection pipe means which is supported to pass through the cleaner case means and the bulkhead and which is disposed in one of the unpurified chamber and the purified chamber, and wherein the branching connection pipe means is connected to a main fuel injection means side branched fuel conduit means for leading fuel toward the main fuel injection means side and to a secondary fuel injection means side branched fuel conduit means for leading fuel toward the secondary fuel injection means.

11. The fuel supply structure in a vehicle engine according to claim 10 , wherein the branching connection pipe means includes a pair of branched pipe portions disposed in the unpurified chamber, and wherein one of the branched pipe portions passes through the bulkhead and is supported by the bulkhead to open on a purified chamber side.

12. The fuel supply structure in a vehicle engine according to claim 11 , wherein a lower case half body means and an upper case half body means are vertically dividable and are combined to form the cleaner case means, and wherein the branching connection pipe means which is disposed in the

Assignees

• Honda Motor Co Ltd

Inventors

• Nishimura Shin

Classifications

• F02M35/162

  Motorcycles; All-terrain vehicles, e.g. quads, snowmobiles; Small vehicles, e.g. forklifts · CPC title

• F02M35/042

  combined with other devices, e.g. heaters (F02M35/021, F02M35/06, F02M35/14 take precedence); for use other than engine air intake cleaning, e.g. air intake filters arranged in the fuel vapour recovery system · CPC title

• F02M35/10183

  Engines having intake ducts fed from a separate carburettor or injector, the idling system being considered as a separate carburettor · CPC title

• F02M55/004

  Joints; Sealings · CPC title

• F02M35/024

  using filters, e.g. moistened (F02M35/026 takes precedence; cleaning of the filtering material F02M35/08) · CPC title