Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1998-05-05
2000-09-12
Miller, Carl S.
Internal-combustion engines
Charge forming device
Fuel injection system
123509, F02M 5502
Patent
active
061162183
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a direct injection engine. More particularly, it relates to a device for fixing a fuel injector on a cylinder head.
BACKGROUND ART
There is known a direct injection gasoline as well as Diesel engine in which each of the fuel injectors is disposed in the substantial center of four intake and exhaust ports of the cylinder head.
In this direct injection engine, each of the fuel injectors is inserted into each attachment hole formed in the cylinder head.
The fuel injector inserted in the cylinder head in this way is then fixed to the cylinder head by an injector push arm arranged at the top of the cylinder head (see Japanese Unexamined Utility Model Publication (kokai) No. 6-69360 and 60-57775, Japanese Unexamined Patent Publication (kokai) No. 4-76208, the same 6-221248, and Japanese Unexamined Utility Model Publication (kokai) No. 4-43242).
One example of conventional devices, as disclosed in the Japanese Unexamined Utility Model Publication No. 60-57775, for fixing the fuel injectors to the cylinder head by the injector push arms will be explained hereinafter. The injector push arm is provided, at a leading end thereof, with a pusher part which comes into contact with an end of the fuel injector opposite to a fuel injection nozzle. At the rear end of the injector push arm, a support part is formed so as to abut on a head part of a cylinder head bolt. Between the pusher part and the support part of the injector push arm, an attachment part is provided with a through hole through which a stud bolt is screwed into a cylinder head.
Owing to the provision of the pusher part abutting on the fuel injector, the support part abutting on the head part of the cylinder head bolt and the attachment part fixed to the cylinder head through the stud bolt, the injector push arm serves to fix the fuel injector to the cylinder head. In this fixing arrangement, a contact between the head part of the cylinder head bolt and the support part constitutes a fulcrum of the injector push arm.
The inventor of the present invention has recognized disadvantages with the prior art arrangements, especially when these are applied to an over-head camshaft (OHC) engine.
DISCLOSURE OF THE INVENTION
In case of the OHC (over-head camshaft) engine where camshafts are positioned above the cylinder head, the injector push arm has to be arranged so as to extend or over at least one camshaft. Such an arrangement causes a contact point of the pusher part of the injector push arm with the fuel injector to be elevated. Consequently, a distance between the attachment part and the support part is increased thereby to lengthen the whole length of the injector push arm.
Therefore, the lengthened injector push arm is apt to cause the rigidity to be reduced. Further, due to the low position of the fulcrum, the injector push arm is easy to tumble down to the side of the support part, so that a force of the pusher part applied on the fuel injector may be lowered.
It is therefore an object of the present invention to provide a fuel injector fixing device for a direct injection engine, which is capable of developing the pushing force of the push part onto the fuel injector.
The object of the present invention described above can be accomplished by a fuel injector fixing device for fixing a fuel injector having a fuel injection nozzle at a leading end thereof to a cylinder head of a direct injection engine, the fuel injector fixing device comprising: upwardly; injector to the cylinder head, the injector push arm consisting of a pusher part which is arranged at one end of the injector push arm so as to abut on one end of the fuel injector opposite to the fuel injection nozzle, a support part which is arranged at the other end of the injector push arm so as to abut on a top of the spacer, and an attachment part which is arranged between the pusher part and the support part, the attachment part being provided with a through hole into which the stud bolt is inserted and screwed into the cylinder head; injector c
REFERENCES:
patent: 3945353 (1976-03-01), Dreisin
patent: 4403586 (1983-09-01), Taniguchi
patent: 4539964 (1985-09-01), Djordjevic
patent: 4571161 (1986-02-01), Leblanc
patent: 5499612 (1996-03-01), Haughney
patent: 5697345 (1997-12-01), Genter
Sato Tatsuo
Shiraki Masahito
Miller Carl S.
Nissan Motor Co,. Ltd.
LandOfFree
Fuel injector fixing device for direct injection engine does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fuel injector fixing device for direct injection engine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fuel injector fixing device for direct injection engine will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-86854