Internal-combustion engines – Adjustable combustion chamber – Piston in head adjusted
Patent
1994-11-03
1996-10-08
Okonsky, David A.
Internal-combustion engines
Adjustable combustion chamber
Piston in head adjusted
123 78C, F02D 1504
Patent
active
055620698
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is related to U.S. Ser. No. 08/070,354 filed Jun. 3, 1993 in the name of Per Ing Nilsson, et al. and entitled "INTERNAL COMBUSTION ENGINE WITH VARIABLE COMPRESSION PROVIDED WITH REINFORCEMENTS OF THE CRANKCASE SECTION IN THE REGION OF THE MAIN BEARINGS", the entire disclosure of which is incorporated by reference herein.
This invention relates to a method and apparatus for varying the compression of an internal combustion engine of the type having a cylinder receiving section pivotably mounted to a crankcase section.
An internal combustion engine, for example an in-line engine, of the type in question, has a cylinder receiving section (a cylinder block) which is pivotably connected to the crankshaft supporting crankcase section of the engine by a tilting shaft bearing arrangement connecting the parts on one side of the engine. The cylinder receiving section supports a cylinder head which forms the cylinder head of the engine. In the case of an engine with overhead camshafts, these are mounted in the cylinder head. On the side of the engine opposite the tilting shaft bearing arrangement there is a tilting mechanism arranged between the cylinder receiving section and the crankcase section, with which mechanism the cylinder receiving section and the cylinder head connected to it can be inclined laterally relative to the crankcase section by pivoting about the tilting shaft bearing arrangement.
Because the cylinder receiving section can be inclined (tilted) laterally relative to the crankcase section, the distance between the crankshaft (with adhering pistons) and the cylinders will be variable. The volume of that part of the combustion chamber which is located above the upper limiting surface of the respective pistons, in the upper turning position of the piston (upper dead centre) can therefore be increased by lateral inclination of the cylinder receiving section relative to the crankcase section. This means that the compression ratio of the engine will be variable, enabling the efficiency of the engine to be optimised for varying driving loads, which results in improved engine performance.
The tilting shaft bearing arrangement between the crankcase section and the cylinder receiving section is, as already mentioned, arranged on one side of the engine, whilst the mechanism with which the cylinder receiving section can be inclined relative to the crankcase section is arranged on the opposite side of the engine. The tilting shaft bearing arrangement suitably incorporates a lateral inclination shaft which runs parallel with the crankshaft and which is housed in axially separated bearing brackets which are rigidly connected to this crankcase section and are positioned in line with each other along the outside of the cylinder receiving section, preferably in its lower region. In the intervals between the bearing brackets are situated bearing lugs in the cylinder receiving section mounted on the sections of the lateral inclination shaft located there. The tilting shaft bearing arrangement therefore consists of the bearing brackets, the lateral inclination shaft and the bearing lugs, which together form a type of longitudinal hinge mechanism between the crankcase section and the cylinder receiving section.
The tilting mechanism on the opposite side of the engine may, for example, incorporate essentially vertically directed rods resembling connecting rods, whose upper ends are swivelled on an upper bearing shaft parallel to the crankshaft and passing along the cylinder receiving section. The lower ends of the rods may then be eccentrically mounted on an eccentric shaft, which is in turn swivelled in bearing brackets rigidly connected to the crankcase section. The upper bearing shaft is in this case supported in the upper region of the cylinder receiving section by means of bearing brackets which are rigidly connected to the cylinder receiving section. The distance between the upper bearing shaft and the bearing brackets housing the eccentric shaft in the cran
REFERENCES:
patent: 2433639 (1947-12-01), Woodruff et al.
patent: 2770224 (1956-11-01), Ericson
patent: 3633552 (1972-01-01), Huber
patent: 4174683 (1979-11-01), Vivian
patent: 5025757 (1991-06-01), Larsen
patent: 5113809 (1992-05-01), Ellenburg
patent: 5331928 (1994-07-01), Wood
Bergsten Lars
Gillbrand Per
Okonsky David A.
Saab Automobile Aktiebolag
LandOfFree
Method and device for varying the compression of an internal com does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and device for varying the compression of an internal com, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and device for varying the compression of an internal com will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-50834