Cylinder head

Patent metadata

Field	Value
Publication number	US-11111876-B2
Application number	US-202016837069-A
Country	US
Kind code	B2
Filing date	Apr 1, 2020
Priority date	Apr 12, 2019
Publication date	Sep 7, 2021
Grant date	Sep 7, 2021

Abstract

A cylinder head includes an exhaust port through which exhaust gas discharged out of a combustion chamber of an internal combustion engine passes. The cylinder head includes a first fin and a second fin projecting from an inner wall of the exhaust port and extending in a flow direction of the exhaust gas. The cylinder head includes a first projection projecting from the inner wall of the exhaust port and extending in a direction intersecting the first fin. The cylinder head also includes a second projection projecting from the inner wall of the exhaust port and extending in a direction intersecting the second fin.

First claim

The invention claimed is:

1. A cylinder head comprising:
an exhaust port through which exhaust gas discharged out of a combustion chamber of an internal combustion engine passes;
a fin including a protrusion projecting from an inner wall of the exhaust port and extending in a flow direction of the exhaust gas passing through the exhaust port; and
a projection projecting from the inner wall of the exhaust port and extending in a direction intersecting the fin, wherein
an upstream end of the fin is a tip, and
the projection is located upstream of the tip.

2. The cylinder head according to claim 1 , wherein
the projection includes a front step where a height of the projection projecting from the inner wall becomes higher toward a downstream side, and
the front step includes a guide surface inclined so as to become farther from the inner wall from an upstream end of the projection toward the downstream side.

3. A cylinder head comprising:
an exhaust port through which exhaust gas discharged out of a combustion chamber of an internal combustion engine passes;
a fin including a protrusion projecting from an inner wall of the exhaust port and extending in a flow direction of the exhaust gas passing through the exhaust port;
a projection projecting from the inner wall of the exhaust port and extending in a direction intersecting the fin;
a first fin including the fin; and
a second fin including a protrusion projecting from the inner wall of the exhaust port and extending in the flow direction of the exhaust gas passing through the exhaust port, the second fin being arranged next to the first fin in a circumferential direction of the exhaust port, wherein
the projection is arranged in a gap between the first fin and the second fin.

4. The cylinder head according to claim 3 , wherein the first fin and the second fin each include a wave part shaped such that the gap meanders.

5. The cylinder head according to claim 3 , wherein
the projection includes a front step where a height of the projection projecting from the inner wall becomes higher toward a downstream side, and
the front step includes a guide surface inclined so as to become farther from the inner wall from an upstream end of the projection toward the downstream side.

6. A cylinder head comprising:
an exhaust port through which exhaust gas discharged out of a combustion chamber of an internal combustion engine passes;
a fin including a protrusion projecting from an inner wall of the exhaust port and extending in a flow direction of the exhaust gas passing through the exhaust port;
a projection projecting from the inner wall of the exhaust port and extending in a direction intersecting the fin;
an upstream projection including the projection; and
a downstream projection projecting from the inner wall of the exhaust port and extending in the direction intersecting the fin, the downstream projection being arranged downstream of the upstream projection.

7. The cylinder head according to claim 6 , wherein the upstream projection is shaped such that a part of the exhaust port in a circumferential direction is cut out in a portion of the upstream projection projecting from the inner wall, and
the downstream projection is arranged downstream of the part of the upstream projection that is cut out.

8. The cylinder head according to claim 6 , wherein
the projection includes a front step where a height of the projection projecting from the inner wall becomes higher toward a downstream side, and
the front step includes a guide surface inclined so as to become farther from the inner wall from an upstream end of the projection toward the downstream side.

Assignees

• Toyota Motor Co Ltd

Inventors

• Asano Masahiko
• Takagi Noboru
• Hisaminato Naoto
• Okimura Minoru
• Wakabayashi Shinya

Classifications

• Y02T10/12

  Improving ICE efficiencies · CPC title

• F02F1/4264 Primary

  of exhaust channels · CPC title

• F02F1/30

  Finned cylinder heads · CPC title