# US 2013/0152895 A1 · Intake apparatus for internal combustion engine

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- Number: US 2013/0152895 A1
- Document ID: US20130152895A1
- Status: Published application
- Kind: A1
- Application number: 13/676,833
- Filed: 2012-11-14
- Published: 2013-06-20
- Earliest claimed: 2011-12-16
- Assignees: Mahle Filter System Japan Corporation
- Inventors: Yuji YASUDA
- Web page: https://patentgrep.com/patent/US20130152895A1

## CPC

- F02M 35/1222: {by using adjustable or movable elements, e.g. valves, membranes, bellows, expanding or shrinking elements}
- F02D 9/16: the members being rotatable
- F02M 35/10013: {Means upstream of the air filter; Connection to the ambient air}
- F02M 35/108: with primary and secondary intake passages
- F02M 35/1227: {by using multiple air intake flow paths, e.g. bypass, honeycomb or pipes opening into an expansion chamber}
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W)

## Abstract

An intake apparatus including two intake ducts and a flap mechanism disposed in one of the two intake ducts, the flap mechanism including a main flap, a damper flap, a damper chamber cooperating with the damper flap to form a damper space, and a biasing member biasing the main flap in a closing direction. When the main flap is located in an angular range between the fully closing position and a predetermined opening angle, a peripheral edge of the damper flap is opposed to an inner wall surface of the damper chamber with a fine clearance to thereby render the damper space substantially closed. When the main flap is located with an opening angle larger than the predetermined opening angle, a communication passage to open the damper space is formed between the inner wall surface of the damper chamber and the peripheral edge of the damper flap.

## Claims

### Claim 1

An intake apparatus for an internal combustion engine equipped with an air cleaner, comprising:
two intake ducts connected to an intake inlet of the air cleaner; and
a flap mechanism disposed in one of the two intake ducts, the flap mechanism serving for opening and closing the one of the two intake ducts in response to intake air flow entering into the one of the two intake ducts,
the flap mechanism comprising:
a plate-shaped main flap supported at one end portion thereof so as to be rotatable about a rotation axis between a fully opening position and a fully closing position, the rotation axis being located at the one end portion of the main flap,
a plate-shaped damper flap disposed to make a predetermined angle between the main flap and the damper flap with respect to the rotation axis, the damper flap making a unitary rotation with the main flap,
a damper chamber formed in a portion of an outer wall of the one of the two intake ducts so as to be recessed along a trace of rotational movement of the damper flap, the damper chamber cooperating with the damper flap to form a damper space therebetween, and
a biasing member that biases the main flap in a closing direction;
wherein when the main flap is located in an angular range between the fully closing position and a predetermined opening angle, a peripheral edge of the damper flap is opposed to an inner wall surface of the damper chamber with a fine clearance so that the damper space is rendered substantially closed, and
when the main flap is located with an opening angle larger than the predetermined opening angle, a communication passage that serves to open the damper space is formed between the inner wall surface of the damper chamber and the peripheral edge of the damper flap.

### Claim 2 (depends on 1)

The intake apparatus as claimed in claim 1, wherein the inner wall surface of the damper chamber comprises a peripheral inner-wall surface that is configured to be opposed to a tip end edge of the damper flap with a fine clearance in the angular range between the fully closing position of the main flap and the predetermined opening angle, and be retreated toward an outer peripheral side of the damper chamber to be spaced apart from the tip end edge of the damper flap in an angular range larger than the predetermined opening angle to thereby form the communication passage.

### Claim 3 (depends on 1)

The intake apparatus as claimed in claim 1, wherein the damper chamber has an opening through which the damper chamber is communicated with the intake passage in the one of the two intake ducts, and when the main flap is located in the fully opening position, the main flap closes the opening of the damper chamber.

### Claim 4 (depends on 1)

The intake apparatus as claimed in claim 1, wherein the communication passage extends over a whole width of the damper flap which extends in a direction parallel to the rotation axis.

### Claim 5 (depends on 1)

The intake apparatus as claimed in claim 1, wherein the damper flap has a length extending in a direction perpendicular to the rotation axis which is shorter than a length of the main flap extending in the direction perpendicular to the rotation axis.

### Claim 6 (depends on 2)

The intake apparatus as claimed in claim 2, wherein the peripheral inner-wall surface of the damper chamber comprises a partially cylindrical surface.

### Claim 7 (depends on 2)

The intake apparatus as claimed in claim 2, wherein the peripheral inner-wall surface of the damper chamber comprises a first partially cylindrical surface and a second partially cylindrical surface having a diameter larger than that of the first partially cylindrical surface.