Intake structure of internal combustion engine

Patent metadata

Field	Value
Publication number	US-10648398-B2
Application number	US-201816224420-A
Country	US
Kind code	B2
Filing date	Dec 18, 2018
Priority date	Dec 19, 2017
Publication date	May 12, 2020
Grant date	May 12, 2020

Abstract

In an intake structure of an internal combustion engine, on an intake upstream side from a valve seat of an intake port, a convex portion is provided which protrudes to an inside of the intake port in a place near an outer circumferential portion of a cylinder chamber when viewed from an upper side of the cylinder chamber. The convex portion includes an upstream guide surface extending from an apex of the convex portion to the intake upstream side, and a downstream guide surface extending from the apex to an intake downstream side and including a curved surface recessed inside the convex portion at a middle portion thereof.

First claim

What is claimed is:

1. An intake structure of an internal combustion engine, wherein
on an intake upstream side from a valve seat of an intake port, a convex portion is provided which protrudes from a lower surface of the intake port in an upward direction to an inside of the intake port towards an upper surface of the intake port in a place near an outer circumferential portion of a cylinder chamber when viewed from an upper side of the cylinder chamber, and
the convex portion includes:
an upstream guide surface extending from an apex of the convex portion to the intake upstream side, an entire upstream guide surface having a curved concave shape, and
a downstream guide surface extending from the apex to an intake downstream side and including a curved surface recessed inside the convex portion at a middle portion thereof.

2. The intake structure of the internal combustion engine according to claim 1 , wherein the apex extends in a direction orthogonal to a flow direction of an intake air which flows through the intake port.

3. The intake structure of the internal combustion engine according to claim 1 , wherein two intake ports are provided side by side with respect to one cylinder chamber,
the convex portion is provided each of the two intake ports, and
an inside of the apex of each of the convex portions is formed to be lower than an outside of the apex.

4. The intake structure of the internal combustion engine according to claim 3 , wherein a shape of the convex portion is formed to be linearly symmetrical to a virtual line drawn between the two intake ports when viewed from the upper side of the cylinder chamber.

5. The intake structure of the internal combustion engine according to claim 1 , wherein the downstream guide surface extends from the apex to an intake valve seat defining the intake port.

6. The intake structure of the internal combustion engine according to claim 1 , wherein the apex extends in a direction orthogonal to a flow direction of an intake air at the intake port when viewed from an upstream side of the intake air inside the intake port.

Assignees

• Mitsubishi Motors Corp

Inventors

• Yoshihara Akira
• Matsumoto Koichi
• Nabetani Shigeki
• Koyama Kazuaki
• Okamoto Yuya

Classifications

• F02M35/10118

  with variable cross-sections of intake ducts along their length; Venturis; Diffusers · CPC title

• F02B23/10 Primary

  with separate admission of air and fuel into cylinder · CPC title

• F02F1/425

  with a separate deviation element inside the channel · CPC title

• F02F1/4235

  of intake channels · CPC title

• F02F1/4214

  specially adapted for four or more valves per cylinder · CPC title