Intake device

Patent metadata

Field	Value
Publication number	US-10260462-B2
Application number	US-201515308416-A
Country	US
Kind code	B2
Filing date	Mar 24, 2015
Priority date	Jul 1, 2014
Publication date	Apr 16, 2019
Grant date	Apr 16, 2019

Abstract

In an intake device for an internal combustion engine, a difference in the air-fuel ratio between the cylinders is reduced without increasing the lengths of the branch passages. An intake device (23) for an internal combustion engine (1) having at least three cylinders (3) includes: an intake chamber (30) configured to be connected with an air inlet (16); and multiple branch passages (31) connected at upstream ends (41) thereof to the intake chamber and connected at downstream ends thereof to intake ports (6) communicating with the cylinders, respectively, wherein the upstream ends of the branch passages are arranged in a direction of rotation about a predetermined center line X in a same order as an order of ignition of the cylinders.

First claim

The invention claimed is:

1. An intake device for an internal combustion engine having first to fourth cylinders arranged along a predetermined cylinder row direction, the intake device comprising:
an intake chamber formed in a shape of a rectangular pyramid having a rectangular bottom plate and configured to be connected at a top portion thereof to an air inlet; and
a first to fourth branch passages connected at upstream ends thereof to the bottom plate of the intake chamber and connected at downstream ends thereof to intake ports communicating with the first to fourth cylinders, respectively,
wherein:
the upstream ends of the branch passages are arranged in a direction of rotation about a predetermined center line in a same order as an order of ignition of the cylinders;
the order of ignition is first, third, fourth, and second cylinder or first, second, fourth, and third cylinder;
the center line is positioned on a plane perpendicular to the cylinder row direction to pass through a part between the second and third cylinders;
the bottom plate is disposed such that a pair of diagonally positioned corners thereof are arranged in the cylinder row direction about the center line, and a remaining pair of corners are arranged in a first direction that is perpendicular to the cylinder row direction and the center line;
the upstream end of the first branch passage communicating with the first cylinder is located in a corner of the bottom plate disposed on a first cylinder side with respect to the center line in the cylinder row direction;
the upstream end of the fourth branch passage communicating with the fourth cylinder is located in a corner of the bottom plate disposed on a fourth cylinder side with respect to the center line in the cylinder row direction;
the upstream end of the second branch passage communicating with the second cylinder is located in a corner of the bottom plate disposed on one side with respect to the center line in the first direction;
the upstream end of the third branch passage communicating with the third cylinder is located in a corner of the bottom plate disposed on the other side with respect to the center line in the first directions;
each of the first branch passage and the fourth branch passage extends from the upstream end thereof to the downstream end thereof obliquely outward in the cylinder row direction relative to the center line;
each of the second branch passage and the third branch passage extends from the upstream end thereof to the downstream end thereof obliquely toward the center line in the first direction and outward in the cylinder row direction relative to the center line.

2. The intake device according to claim 1 , wherein the first branch passage and the fourth branch passage are formed to be symmetric to each other with respect to a virtual plane perpendicular to the cylinder row direction and containing the center line, and extend from the bottom plate obliquely outward in the cylinder row direction relative to the center line.

3. The intake device according to claim 2 , wherein the upstream ends of the branch passages corresponding to the first and fourth cylinders are formed to have a transverse cross section in an elliptic shape having a length in the first direction larger than a length in the cylinder row direction.

4. The intake device according to claim 2 , wherein the upstream end of the branch passage corresponding to the second cylinder is offset relative to the center line in the cylinder row direction toward the branch passage corresponding to the cylinder in which ignition is performed immediately before ignition in the second cylinder, and
the upstream end of the branch passage corresponding to the third cylinder is offset relative to the center line in the cylinder row direction toward the branch passage corresponding to the cylinder in which ignition is performed immediately before ignition in the third cylinder.

5. The intake device according to claim 2 , wherein a first barrier for suppressing a flow of gas is provided to protrude from a part of an inner surface of a housing forming the intake chamber between the upstream end of the branch passage corresponding to the first cylinder and the upstream end of the branch passage corresponding to the cylinder in which ignition is performed immediately before ignition in the first cylinder, and
a second barrier for suppressing a flow of gas is provided to protrude from a part of the inner surface of the housing forming the intake chamber between the upstream end of the branch passage corresponding to the fourth cylinder and the upstream end of the branch passage corresponding to the cylinder in which ignition is performed immediately before ignition in the fourth cylinder.

6. The intake device according to claim 5 , wherein each of the first barrier and the second barrier extends from a peripheral part of the inner surface of the rectangular bottom plate toward the center line.

7. The intake device according to claim 2 , wherein a part of an inner surface of a housing forming the intake chamber between the upstream end of the branch passage corresponding to the first cylinder and the upstream end of the branch passage corresponding to the cylinder in which ignition is performed immediately before ignition in the first cylinder is provided with a first curved surface portion that is smooth to facilitate a flow of gas, and
a part of the inner surface of the housing forming the intake chamber between the upstream end of the branch passage corresponding to the fourth cylinder and the upstream end of the branch passage corresponding to the cylinder in which ignition is performed immediately before ignition in the fourth cylinder is provided with a second curved surface portion that is smooth to facilitate a flow of gas.

8. The intake device according to claim 1 , wherein a total length of the branch passage and intake port is set to be equal for each of the cylinders.

9. The intake device according to claim 8 , wherein lengths of the branch passages are set to be equal to each other.

10. The intake device according to claim 1 , comprising:
a chamber forming member forming the intake chamber;
a plurality of passage forming members forming the branch passages, respectively; and
a connecting wall connecting an outer surface of the chamber forming member and outer surfaces of the passage forming members to each other such that a space defined between the outer surfaces of the chamber forming member and the passage forming members constitutes an inner chamber closed to an outside,
wherein the inner chamber is in communication with the intake chamber.

11. The intake device according to claim 1 , wherein the center line passes centrally through a downstream-side flange connecting the downstream ends of the branch passages to each other and joined to a side face of an engine body.

12. The intake device according to claim 1 , wherein the amount of offset of the upstream ends of the first and fourth branch passages relative to the downstream ends thereof inward in the cylinder row direction is larger than the amount of offset of the upstream ends of the second and third branch passages relative to the downstream ends thereof inward in the cylinder row direction.

13. The intake device according to claim 1 , wherein the center line is positioned so as to coincide with the perpendicular line of the rectangular pyramid of the intake chamber.

14. The intake device according to claim 1 , comprising an introduction passage connected to the top portion of the intake chamber, and disposed such that the axis thereof coincides with the

Assignees

• Honda Motor Co Ltd

Inventors

• Ikeya Kenichiro
• Ishikawa Naohiro

Classifications

• F02M35/10157

  Supercharged engines · CPC title

• F02M35/10

  Air intakes; Induction systems · CPC title

• F02M35/10124

  Ducts with special cross-sections, e.g. non-circular cross-section · CPC title

• F02M35/112 Primary

  for engines with cylinders all in one line · CPC title

• F02P5/00

  Advancing or retarding ignition; Control therefor · CPC title