# US 2015/0176531 A1 · Carburetor with single diaphragm for supplying and metering fuel

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- Number: US 2015/0176531 A1
- Document ID: US20150176531A1
- Status: Published application
- Kind: A1
- Application number: 14/139,203
- Filed: 2013-12-23
- Published: 2015-06-25
- Earliest claimed: 2013-12-23
- Assignees: Zama Japan Kabushiki Kaisha
- Inventors: David R. Shebuski; Toshiyuki Kuyo; Nonaka Takumi; Jay A. Perry
- Web page: https://patentgrep.com/patent/US20150176531A1

## CPC

- F02M 17/04: having fuel inlet valve controlled by diaphragm
- F02M 9/121: {Iris diaphragms}
- F02M 37/00: Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- 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 carburetor includes a body with an air intake path, a fuel pump and a fuel pressure regulator. The fuel pump and fuel pressure regulator are positioned on the same side of the body. A fuel pump and metering chamber diaphragm is sandwiched between the body of the carburetor and a pump body and cover. The diaphragm separates a pump chamber from a pulse chamber of the fuel pump and separates a fuel chamber from an air chamber in the fuel pressure regulator. Inlet and outlet flapper valves are part of the diaphragm or a separate flapper valve member positioned between the body and the diaphragm.

## Claims

### Claim 1

A carburetor comprising a body with an air intake path extending there through,
a pump cover coupled to a side of the body, and
a diaphragm interposed between the body of the carburetor and the pump cover, wherein the diaphragm divides a fuel pump into a pulse chamber formed in the body of the carburetor and a pump chamber formed in the pump cover, and divides a fuel pressure regulator into a constant pressure fuel chamber formed in the body of the carburetor and an air chamber formed in the pump cover, wherein the pulse chamber and constant pressure fuel chamber are formed in the body of the carburetor on the same side of the carburetor.

### Claim 2 (depends on 1)

The carburetor of claim 1 further comprising a gasket interposing the diaphragm and the pump cover.

### Claim 3 (depends on 1)

The carburetor of claim 1 wherein the diaphragm includes a pump portion and a metering portion.

### Claim 4 (depends on 3)

The carburetor of claim 3 wherein the diaphragm includes a first portion comprising the pump portion and a second portion comprising a metering portion.

### Claim 5 (depends on 1)

The carburetor of claim 1 wherein the diaphragm includes an inlet flapper valve and an outlet flapper valve.

### Claim 6 (depends on 1)

The carburetor of claim 1 further comprising a flapper valve member interposing the diaphragm and the body of the carburetor, wherein the flapper valve member includes an inlet flapper valve and an outlet flapper valve.

### Claim 7

A carburetor comprising a body,
an air intake path in the body,
a fuel pump, and
a metering chamber in fluid communication with the fuel pump and the air intake path, wherein the fuel pump and the metering chamber are positioned on the same side of the body.

### Claim 8 (depends on 7)

The carburetor of claim 7 further comprising a pump and metering diaphragm.

### Claim 9 (depends on 8)

The carburetor of claim 8 wherein the pump and metering diaphragm is sandwiched between the body of the carburetor and a pump cover.

### Claim 10 (depends on 9)

The carburetor of claim 9 wherein the diaphragm separates a pump chamber from a pulse chamber of the fuel pump and separates a fuel chamber from an air chamber in the metering chamber.

### Claim 11 (depends on 9)

The carburetor of claim 9 further comprising inlet and outlet flapper valves.

### Claim 12 (depends on 11)

The carburetor of claim 11 wherein the inlet and outlet flapper valves are formed in the diaphragm.

### Claim 13 (depends on 11)

The carburetor of claim 11 further comprising a separate flapper valve member comprising the inlet and outlet flapper valves and positioned between the body and the diaphragm.

### Claim 14 (depends on 9)

The carburetor of claim 9 further comprising a gasket interposing the diaphragm and the pump cover.

### Claim 15 (depends on 9)

The carburetor of claim 9 wherein the diaphragm includes a pump portion and a metering portion.

### Claim 16 (depends on 15)

The carburetor of claim 15 wherein the diaphragm includes a first portion comprising the pump portion and a second portion comprising a metering portion.

### Claim 17 (depends on 7)

The carburetor of claim 7 further comprising a main fuel jet in fluid communication with the metering chamber and releasably mounted within the body.

### Claim 18 (depends on 17)

The carburetor of claim 17 further comprising a jet retainer releasably coupling the main fuel jet to a check valve mounted within the body.

### Claim 19 (depends on 1)

The carburetor of claim 1 further comprising a main fuel jet in fluid communication with the constant pressure fuel chamber and releasably mounted within the body.

### Claim 20 (depends on 19)

The carburetor of claim 19 further comprising a jet retainer releasably coupling the main fuel jet to a check valve mounted within the body.