Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
1999-11-24
2001-02-27
Moulis, Thomas N. (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C123S184420, C123S472000
Reexamination Certificate
active
06192865
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a fuel injection apparatus for a vehicular engine. The fuel injection apparatus includes an intake pipe having a first straight pipe portion extending in straight line, a second straight pipe portion extending in straight line towards a direction which crosses the first straight pipe portion, and a bent pipe portion for connecting the straight pipe portions to each other. The fuel injection apparatus is connected to a cylinder head of the engine in such a manner that the first straight pipe portion is in communication with an intake port of the engine. Furthermore, a fuel injection valve is held between the intake pipe and a mounting member fastened to the intake pipe.
2. Description of Related Art
A fuel injection apparatus of this type has been known, for example, from Japanese Utility Model Laid-open No. Hei 2-127779, in which a fuel injection valve is mounted to a bent pipe portion of an intake pipe in such a manner that the center of the fuel injection valve is aligned with the center line of a first straight pipe portion of the intake pipe.
The above-described prior art fuel injection apparatus, however, is problematic. Since a distance from the cylinder head to the outer end of the fuel injection valve is relatively large, and the projection amount of the fuel injection apparatus from the engine is large, a space required in the vehicle for mounting an engine of this type on the vehicle becomes large. In particular, such a fuel injection apparatus is unsuitable for a motorcycle.
SUMMARY OF THE INVENTION
In view of the foregoing, the present invention has been made, and an object of the present invention is to provide a fuel injection apparatus for a vehicular engine, which is capable of decreasing the projection amount of a fuel injection valve from the engine, thereby improving the reliability upon mounting the fuel injection valve thereto.
To achieve the above object, according to a first aspect of the present invention, there is provided a fuel injection apparatus for a vehicular engine. The fuel injection apparatus includes an intake pipe having a first straight pipe portion extending along a first straight center line, a second straight pipe portion extending along a second straight center line crossing the first center line, and a bent pipe portion formed into a circular-arc shape while connecting the upstream end of the first straight pipe portion to the downstream end of the second straight pipe portion. The fuel injection apparatus is connected to a cylinder head in such a manner that the downstream end of the first straight pipe portion is in communication with an intake port provided in the cylinder head. Furthermore, a fuel injection valve for injecting fuel to the intake port is held between a mounting member fastened to the intake pipe and the intake pipe. The fuel injection apparatus includes a seat for receiving the fuel injecting valve provided in the intake pipe at a portion closer to the intake port than a straight line connecting a crossing point of the first and second center lines to a curved center of the bent pipe portion; a fastening seat for fastening the mounting member to the intake pipe provided on the intake pipe at such a position as to form the straight line between the seat and the fastening seat; and the seat and the fastening seat formed in parallel with each other.
With this configuration according to the first aspect of the present invention, since the seat for receiving the fuel injection valve is provided in the intake pipe at a position between the bent pipe portion and the intake port, it is possible to decrease the projecting amount of the outer end of the fuel injection valve from the cylinder head, and hence to make the entire engine including the fuel injection apparatus compact. Also, since the outer end of the fuel injection valve is relatively far from the first center line and the fastening seat for fastening the mounting member, which is used for holding the fuel injection valve between the seat and the same, is provided on the second straight pipe portion side, it is possible to ensure a sufficient space for disposing the mounting member. Furthermore, since the seat and the fastening seat are disposed in parallel with each other, it is possible to easily mount the fuel injection valve to the intake pipe and to improve the reliability upon mounting the fuel injection valve thereto.
According to a second aspect of the present invention, in addition to the configuration of the first aspect of the present invention, a fuel passage, which extends in a direction tilting at an acute angle formed with respect to the second center line and is in communication with the fuel injection valve, is formed in the mounting member. With this configuration, a fuel conduit to be connected to the fuel passage can be disposed along the second straight pipe portion of the intake pipe. Accordingly, it is possible to easily ensure a space for disposing the fuel conduit as well as to protect the fuel conduit. This is advantageous in preventing the occurrence of vapor gas due to vibration of the fuel conduit.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
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patent: 5664533 (1997-09-01), Nakayama et al.
patent: 5816213 (1998-10-01), Gaviani et al.
patent: 5950586 (1999-09-01), Ropertz
patent: 2127779 U (1990-10-01), None
Hori Yoshiaki
Kubota Toshiyuki
Nishi Tohru
Birch & Stewart Kolasch & Birch, LLP
Honda Giken Kogyo Kabushiki Kaisha
Moulis Thomas N.
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