Internal combustion engine

Patent metadata

Field	Value
Publication number	US-9745916-B2
Application number	US-201213608173-A
Country	US
Kind code	B2
Filing date	Sep 10, 2012
Priority date	Sep 29, 2011
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

Abstract

An intake port is configured such that a center position of an intake upstream side opening is offset to one side in a juxtaposition direction of intake downstream side openings with respect to a center position between the intake downstream side openings in the juxtaposition direction as viewed in plan of a cylinder head. An injector is configured such that a fuel injection center axial line is inclined to the other side in the juxtaposition direction with respect to a center axial line of the intake upstream side opening as viewed in plan of the cylinder head.

First claim

The invention claimed is:

1. An internal combustion engine including two intake valves provided per one cylinder, an intake port formed in a cylinder head and branched to two for communicating with two intake downstream side openings which are individually opened and closed by said intake valves and a single intake upstream side opening to which an intake system part is connected, a fuel injection valve attached to said intake system part for injecting fuel into said intake port, and a first spray relief portion and a second spray relief portion located near the fuel injection valve,
wherein said intake downstream side openings are juxtaposed at an equal height from a mating face of said cylinder head with a cylinder main body;
wherein said intake port is configured such that a center position of said intake upstream side opening is offset to one side in a juxtaposition direction of said intake downstream side openings with respect to a center position between said intake downstream side openings in the juxtaposition direction as viewed in plan of said cylinder head,
wherein said fuel injection valve disposed at an upper portion of said intake system part is configured such that a fuel injection center axial line thereof is positioned on a central line of the intake system part and the intake upstream side opening, while also being inclined to another side in the juxtaposition direction with respect to a center axial line of said intake downstream side opening as viewed in plan of said cylinder head,
wherein a central axis line of the cylinder head passing a cylinder center is inclined with respect to a crankcase such that a first side of the cylinder head is positioned higher than a second side of the cylinder head,
wherein the fuel injector valve includes a pair of fuel injection ports, wherein the fuel injection ports carry out fuel injection into two directions which are branched in a broadening manner equally between the one side and the another side of the center axial line, and
wherein the first fuel spray relief portion extends to a front end of a main throttle body, and the second fuel spray relief portion is provided in a concave manner at an upper end portion of an inner periphery of a rear portion of an insulator connected to the throttle body in such a manner as to connect to a front end of the first fuel spray relief portion.

2. The internal combustion engine according to claim 1 , wherein said fuel injection valve is disposed at a top portion of said intake system part in the vertical direction.

3. The internal combustion engine according to claim 1 ,
wherein said intake system part comprises the throttle body disposed on the upstream side of said intake port and the insulator for interconnecting said throttle body and said intake port, and, wherein
at a top portion of said throttle body in the vertical direction, said fuel injection valve is disposed and the first fuel spray relief portion is formed by cutting away an inner wall thereof while, at a top portion of said insulator in the vertical direction, a second fuel spray relief portion connecting to said fuel spray relief portion of said throttle body is formed by cutting away an inner wall thereof.

4. The internal combustion engine according to claim 3 ,
wherein said throttle body comprises a tubular main body which forms an intake passage, a pivot shaft which crosses said intake passage horizontally, and a throttle valve supported on said main body through said pivot shaft for opening and closing said intake passage, and wherein
said fuel injection valve is configured to perform fuel injection which is branched to two directions along a plane parallel to a center axial line of said pivot shaft.

5. The internal combustion engine according to claim 4 , further comprising a throttle drum secured to one end of said pivot shaft, a sensor for engaging with another end of said pivot shaft, an L-shaped hose joint connected to said fuel injection valve, and a fuel hose extending above said sensor and connected to said hose joint.

6. An internal combustion engine, comprising:
a cylinder main body having at least one cylinder therein;
a cylinder head;
a plurality of intake valves, disposed such that two intake valves are provided per one cylinder,
wherein an intake port is disposed in the cylinder head, and branched so as to communicate with two intake downstream side openings which are individually opened and closed by said intake valves, and a single upstream side opening to which an intake system part is connected, said engine further comprising
a fuel injection valve attached to said intake system part, said fuel injection valve configured to inject fuel into said intake port, and
a first spray relief portion and a second spray relief portion located near the fuel injection valve,
wherein said intake downstream side openings are juxtaposed at an equal height from a mating phase of said cylinder head with said cylinder main body, said intake port being configured such that a center position of said intake upstream side opening is offset to one side in a juxtaposition direction of said intake downstream side opening with respect to a center position between said intake downstream side opening in the juxtaposition direction as viewed in plan of said cylinder head, and said fuel injection valve is disposed at an upper portion of said intake system part,
wherein said fuel injection valve being configured such that a fuel injection center axial line thereof is positioned on a central line of the intake system part and the intake upstream side opening while also being inclined to another side in the juxtaposition direction with respect to a center axial line of said intake downstream side opening as viewed in plan of said cylinder head,
wherein a central axis line of the cylinder head passing a cylinder center is inclined with respect to a crankcase such that a first side of the cylinder head is positioned higher than a second side of the cylinder head,
wherein the fuel injector valve includes a pair of fuel injection ports, wherein the fuel injection ports carry out fuel injection into two directions which are branched in a broadening manner equally between the one side and the another side of the center axial line, and
wherein the first fuel spray relief portion extends to a front end of a main throttle body, and the second fuel spray relief portion is provided in a concave manner at an upper end portion of an inner periphery of a rear portion of an insulator connected to the throttle body in such a manner as to connect to a front end of the first fuel spray relief portion.

7. The internal combustion engine according to claim 6 , wherein said fuel injection valve is disposed at a top portion of said intake system part in the vertical direction.

8. The internal combustion engine according to claim 6 , wherein the intake system part comprises the throttle body disposed on the upstream side of said intake port, and the insulator for interconnecting said throttle body and said intake port, and wherein at a top portion of said throttle body in the vertical direction, said fuel injection valve is disposed, and wherein the first fuel spray relief portion is disposed in an inner wall thereof, and the second fuel spray relief portion, connecting to the first fuel spray relief portion, is disposed in an inner wall of said insulator.

9. The internal combustion engine according to claim 8 , wherein said throttle body comprises a tubular main body which forms an intake passage, a pivot shaft crossing said intake passage, and a throttle valve supported on said main body through said pivot shaft for opening and closing said intake passage, and wherein said fuel injection valve is c

Assignees

• Yokotani Hitoshi
• Shomura Takaaki
• Sotani Hiroshi
• Maeda Teppei
• Honda Motor Co Ltd

Inventors

• Yokotani Hitoshi
• Shomura Takaaki
• Sotani Hiroshi
• Maeda Teppei

Classifications

• F02D2009/0206

  specially positioned with relation to engine or engine housing · CPC title

• F02M69/044

  for injecting into the intake conduit downstream of an air throttle valve · CPC title

• F02D9/107

  Manufacturing or mounting details · CPC title

• F02D9/105

  having a throttle position sensor (detection of actuation F02D11/106) · CPC title

• F02F1/242 Primary

  Arrangement of spark plugs or injectors · CPC title