# US 7,743,744 B2 · Air intake device for vehicle internal combustion engine

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- Number: US 7,743,744 B2
- Document ID: US7743744B2
- Status: Granted
- Kind: B2
- Application number: 12/212,225
- Filed: 2008-09-17
- Published: 2009-04-23
- Granted: 2010-06-29
- Earliest claimed: 2007-10-18
- Assignees: Nissan Motor Co., Ltd.
- Inventors: Hiroyuki Ichikawa
- Web page: https://patentgrep.com/patent/US7743744B2

## CPC

- B60T 17/04: Arrangements of piping, valves in the piping, e.g. cut-off valves, couplings or air hoses (traction couplings involving joints for supply lines, electric circuits, or the like B60D1/62; couplings peculiar to railway vehicles for, or combined with, couplings or connectors for fluid conduits or electric cables B61G5/06; pipes, cut-off valves, couplings, air hoses per se F16C, F16K, F16L)
- F02M 35/10229: {the intake system acting as a vacuum or overpressure source for auxiliary devices, e.g. brake systems; Vacuum chambers (air storage chamber F02B21/00)}
- F02M 35/116: for engines with cylinders in V-arrangement or arranged oppositely relative to the main shaft
- B60T: VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL (electrodynamic brake systems for vehicle, in general B60L; brakes per se, i.e. devices where braking effect occurs, including ultimate brake actuators, F16D); ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF

## Abstract

An internal combustion engine for a vehicle comprises a pair of intake collectors (3A, 3B) and a communicating pipe (13) connecting the pair of intake collectors (3A, 3B). A negative pressure supply port (15) supplying intake negative pressure of the internal combustion engine to a brake booster is provided at an end of the communicating pipe (13). By providing an air amount deviation compensating arrangement which compensates for a deviation in the amounts of air flowing into the pair of intake collectors (3A, 3B) from the brake booster when braking of the vehicle is released, the amounts of air supplied to the internal combustion engine from the pair of the intake collectors (3A, 3B) are equalized.

## Claims

### Claim 1

An air intake device for an internal combustion engine for a vehicle, comprising:
a pair of intake passages;
a communicating pipe disposed separately from the pair of intake passages and connecting the pair of intake passages so as to equalize the intake air amount/pressure in the pair of intake passages;
a negative pressure supply port provided on the communicating pipe for supplying negative pressure to a brake booster which assists braking of the vehicle depending on the negative pressure; and
wherein each of the pair of intake passages comprises an intake collector, and the communicating pipe is connected to the two intake collectors.

### Claim 2 (depends on 1)

The air intake device as defined in claim 1, further comprising an equalizing arrangement which equalizes the amounts of air distributed to the pair of intake passages from the brake booster via the communicating pipe when a braking of the vehicle is released.

### Claim 3 (depends on 2)

The air intake device as defined in claim 2, wherein the communicating pipe comprises two communication ports connected to the pair of intake passages, and the equalizing arrangement comprises disposing the negative pressure supply port at a midpoint between the two communication ports.

### Claim 4

An air intake device for an internal combustion engine for a vehicle, comprising:
a pair of intake passages;
a communicating pipe connecting the pair of intake passages;
a negative pressure supply port provided on the communicating pipe for supplying negative pressure to a brake booster which assists braking of the vehicle depending on the negative pressure;
an equalizing arrangement which equalizes the amounts of air distributed to the pair of intake passages from the brake booster via the communicating pipe when a braking of the vehicle is released; and
wherein the negative pressure supply port is disposed in a vicinity of one of communication ports, and the equalizing arrangement comprises an air amount deviation compensating arrangement which compensates for a deviation in the amounts of air distributed to two communication ports from the brake booster via the communicating pipe.

### Claim 5 (depends on 4)

The air intake device as defined in claim 4, wherein the air amount deviation compensating arrangement comprises setting a direction of the negative pressure supply port to cause an axis of the negative pressure supply port and an axis of the one of the communication ports to intersect at an acute angle.

### Claim 6 (depends on 5)

The air intake device as defined in claim 5, wherein the communicating pipe comprises an extension which extends sideward beyond the one of the communication ports, and the negative pressure supply port is provided on the extension.