# US 8,539,937 B2 · Fuel supplying apparatus for internal combustion engine

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- Number: US 8,539,937 B2
- Document ID: US8539937B2
- Status: Granted
- Kind: B2
- Application number: 13/158,928
- Filed: 2011-06-13
- Published: 2011-12-15
- Granted: 2013-09-24
- Earliest claimed: 2010-06-14
- Assignees: Honda Motor Co., Ltd.
- Applicants: Takao Kobayashi
- Inventors: Takao Kobayashi
- Web page: https://patentgrep.com/patent/US8539937B2

## CPC

- F02M 37/20: characterised by means for preventing vapour lock
- F02M 37/0017: {related to fuel pipes or their connections, e.g. joints or sealings (F02M55/004 takes precedence)}
- F02M 37/02: Feeding by means of suction apparatus, e.g. by air flow through carburettors (by driven pumps F02M37/04)
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF

## Abstract

A fuel supplying apparatus is disclosed that suppresses intrusion of oil mist into a negative pressure introducing inlet of an automatic cock and that, thereby, improves the degree of freedom of disposition. The negative pressure introducing inlet of the automatic cock is connected to a crankcase through a negative pressure communication path. The automatic cock is opened by a negative pressure generated in the crankcase and, thereby, a fuel supply path is opened that is for supplying fuel from a fuel tank to an internal combustion engine. The negative pressure communication path communicates with the air cleaner through a purge path that branches from the negative pressure communication path at a halfway point of the negative pressure communication path. The point at which the purge path branches from the negative pressure communication path is set to be at the lowest position of the negative pressure communication path to be able to collect the oil mist intruding from the crankcase.

## Claims

### Claim 1

A fuel supplying apparatus for an internal combustion engine, comprising:
a crankcase of the internal combustion engine;
a negative pressure introducing inlet of an automatic cock connected to the crankcase through a negative pressure communication path; and
a fuel supplying path that is opened for supplying fuel from a fuel tank to the internal combustion engine, by opening the automatic cock via a negative pressure generated in the crankcase,
wherein the negative pressure communication path communicates with an air cleaner through a purge path that branches from the negative pressure communication path at a halfway point of the negative pressure communication path, and a point at which the purge path branches from the negative pressure communication path is set to be at a lowest position of the negative pressure communication path so as to collect oil mist that intrudes from the crankcase.

### Claim 2 (depends on 1)

The fuel supplying apparatus of claim 1, wherein a point at which the purge path is connected to the air cleaner is positioned at a position that is lower than the point at which the purge path branches.

### Claim 3 (depends on 1)

The fuel supplying apparatus of claim 1, wherein the purge path has an air flow resistance increasing unit in a vicinity of the point at which the purge path branches, and the air flow resistance increasing unit is adapted to set air flow resistance of the purge path to be higher than air flow resistance of the negative pressure communication path.