Internal-combustion engines – Poppet valve operating mechanism – Lubrication
Patent
1993-02-17
1993-12-28
Cross, E. Rollins
Internal-combustion engines
Poppet valve operating mechanism
Lubrication
123 906, 74567, F01L 910, F01M 1100, F01M 1102
Patent
active
052730077
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an arrangement according to the preamble of claim 1.
From the FR-A-54 29 94, an arrangement for distributing oil in a camshaft of an internal-combustion engine is known in which the bearing points for the camshaft are connected to an oil circulating system and a cylindrical insert extends axially inside the camshaft and bounds a hollow space between the camshaft and this insert and has a centrally extending oil duct.
By means of this arrangement, one and the same oil flow can be guided inside the oil duct to remote lubricating points and can be guided inside the hollow space to close lubricating points.
The invention is based on the object of providing an arrangement for the distribution of oil in a camshaft which makes it possible to guide several oil flows in the camshaft independently of one another.
This object is achieved by means of the characteristics of claim 1. Advantageous developments of the invention are indicated in the subclaims.
This arrangement for the distribution of oil permits the targeted guiding of a first and a second oil flow inside a camshaft. In this case, the oil flows are completely separated from one another and may therefore have different pressures, flow rates, flow directions, etc.
The oil duct, which is arranged centrally in the insert, by way of a first radially extending duct, is connected to the oil circulating system and carries a first oil flow, for example, from one end to the camshaft to one or to several bearing points. The oil duct is coaxially enclosed at least in sections by a circular hollow space which extends between the insert and the camshaft. In this hollow space, a second oil flow is carried which is connected to the oil circulating system by way of a second duct.
Between a first and a second duct, the insert has a first sealing section which axially bounds the hollow space on one side and separates the oil flows from one another.
Advantageously, the arrangement is suitable for various applications. Thus, for example, from one end of the camshaft, two oil flows may be fed into the oil duct or the hollow space in order to ensure, by way of the first duct, the lubricating of bearing points while, by means of the second duct, hydraulically connectable and disconnectable cams are operated.
In a further application, the arrangement may be used for actuating a hydraulically operated phase converter. In this case, the phase converter changes the relative rotating position between the inlet camshaft and the outlet camshaft of an internal-combustion engine by means of an axial displacement of a control piston in two end positions. According to the displacement direction of the control piston, a pressurized-oil flow is fed through one of the ducts into the camshaft, while the unpressurized oil volume displaced by the control piston is discharged by way of the second duct.
The insert may be made of plastic to be light in weight, cost-saving and insensitive to tolerances. It is pressed into the camshaft with a slight overdimension.
For avoiding transversal vibrations of the insert in the camshaft, it is provided in the area of the hollow space with ribs which are arranged between the oil duct and the inner surface of the camshaft and which divide the hollow space into several oil grooves.
The first sealing section consists of several radially acting sealing elements which effectively separate the oil flows from one another and prevent vibrations of the insert in this area.
An embodiment of the invention is explained in detail by means of figures.
FIG. 1 is a partial sectional view of an arrangement;
FIG. 2 is an enlarged sectional view along Line II--II according to FIG. 1;
FIG. 3 is an enlarged view of a second embodiment of a detail X according to FIG. 1;
FIG. 4 is an enlarged view of a third embodiment of a detail X according to FIG. 1;
FIG. 5 is an enlarged view of a detail Y according to FIG. 1; and
FIG. 6 is an enlarged view of a detail Z according to FIG. 1.
A hollow constructed camshaft 1 of an internal-combustion engine, which is not s
REFERENCES:
patent: 4949683 (1990-08-01), Swars
patent: 5186129 (1993-02-01), Magnan et al.
patent: 5201247 (1993-04-01), Maus et al.
Cross E. Rollins
Dr. Ing. h.c.F. Porsche AG
Lo Weilun
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