Internal combustion engine with inlet and outlet valves

Details Internal combustion engine with inlet and outlet valves Internal combustion engine with inlet and outlet valves

1999-09-08

2001-02-06

Moulis, Thomas N. (Department: 3747)

Internal-combustion engines

Charge forming device

Fuel injection system

C123S470000

Reexamination Certificate

active

06182638

ABSTRACT:

This invention relates to an internal combustion engine with intake valves and exhaust valves and, for each cylinder, one nozzle mount connected to a fuel supply line and an overflow oil line for an injection nozzle injecting fuel into a combustion chamber, the nozzle mount being inserted in a first recess of the cylinder head and the cylinder head exhibiting, approximately normally to an engine longitudinal plane containing the cylinder axis, a second recess, which, starting from a first cylinder head longitudinal side wall, strikes the first recess approximately radially.
In internal combustion engines of the type stated at the outset, there is scarcely any free space for the arrangement of the fuel supply line fur the central injection nozzle, especially when there are six cylinder head bolts surrounding one cylinder each and four valves per cylinder. In order to keep the fuel supply line between a cam-actuated screw-in pump and the injection nozzle as short as possible, feeding into the cylinder head on a cylinder head longitudinal side is desirable. The space required therefor is, however, often already occupied by push rods, breathing ducts, cylinder head bolts or the like.
U.S. Pat. No. 3,845,748 A shows such a lateral supply of fuel. Any escaping fuel is returned to an overflow oil bore via a slot between the supply bore and the fuel line. Such a solution is, however, costly and, because of a large number of seals, susceptible to malfunctions.
It is an object of the present invention to find, for an internal combustion engine of the type stated at the outset, a fuel supply line arrangement, favorable in terms of installation and maintenance as well as reliable and space-saving, for a lateral fuel supply.
According to the invention, this object is achieved by virtue of the fact that the second recess continues up to the second cylinder head longitudinal side wall lying opposite the first cylinder head longitudinal side wall and forms the overflow oil drain in this region. This makes possible, on the one hand, very simple fabrication and, on the other hand, simple installation and removal.
The recess for the overflow oil drain preferably opens into an overflow oil line running in the engine longitudinal direction.
An especially favorable design, particularly with respect to thermal stresses, is achieved by virtue of the fact that the fuel supply line is led in the second recess from the first cylinder head longitudinal side wall up to a radial inlet port of the nozzle mount, preferably being clamped in place by a thrust piece made in the form of a hollow screw and screwed into the second recess.
The thrust piece is preferably screwed into the cylinder head about halfway between the first cylinder head longitudinal side wall and the nozzle mount and is sealed off from the cylinder head between the threaded connector and the nozzle mount by a seal, preferably an O-ring seal, the sealed-off overflow oil slot formed by the thrust piece and the cylinder head being in flow connection to the overflow oil line. Further, there can be an additional O-ring seal in the region of the first cylinder head longitudinal side wall to seal the thrust piece off from the cylinder head. In this way, reliable sealing of the thrust piece and the fuel supply line is achieved, any fuel that may leak into the nozzle mount in the opening region of the fuel supply line being fed into the overflow oil system.
In an especially preferred development of the invention, the axis of the second recess, in the region between the threaded connector and the first cylinder head longitudinal side wall, intersects the axis of a cylinder head bolt hole formed into the cylinder head between the thrust piece and the cylinder head gasket surface. During assembly, the cylinder head bolt is first screwed into this cylinder head bolt hole, and then the fuel supply line can be connected to the thrust piece on the nozzle mount. In this way, the bearing surface of the cylinder head bolt hole for the head surface of the cylinder head bolt is sunk under the second recess.


REFERENCES:
patent: 3125078 (1964-03-01), Reiners
patent: 3402703 (1968-09-01), Dickerson et al.
patent: 3431895 (1969-03-01), Bailey
patent: 3845748 (1974-11-01), Eisenberg
patent: 3924583 (1975-12-01), Jardin
patent: 4384557 (1983-05-01), Johnson
patent: 4485790 (1984-12-01), Nishimura
patent: 5775303 (1998-07-01), Sweetland et al.
patent: 382 429 (1987-02-01), None
patent: WO 95/24551 (1995-09-01), None

Affiliated with

Also associated with

Rating

Internal combustion engine with inlet and outlet valves does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Internal combustion engine with inlet and outlet valves, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Internal combustion engine with inlet and outlet valves will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2615105