Internal-combustion engines – Lubricators – Crankcase – pressure control
Patent
1997-04-10
1998-08-04
Solis, Erick R.
Internal-combustion engines
Lubricators
Crankcase, pressure control
123198C, 184 115, 184 272, 417437, F01M 102
Patent
active
057878544
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device with fuel injection and lubricant feed means for internal combustion engines, preferably for manually guided equipment, such as chain saws. The invention comprises a helical gear wheel mounted on a crankshaft or driven indirectly by the crankshaft, which is in engagement with a mating gear wheel for driving the lubricant pump, wherein a piston of the lubricant pump forms a trunnion for the mating gear wheel and possesses an oblique anterior surface area which bears against a lifting stud adjustably retained in the housing, the lifting stud aids adjustments of the lubricant pump delivery volume.
BACKGROUND OF THE INVENTION
Hand-held chain saws, have predominantly used valveless piston pump mechanism to lubricate the cutting chain. A typical oil pump of the prior art possesses a cylindrical pump chamber constructed in the pump housing. The pump chamber possesses an inlet aperture, an outlet aperture and a pump piston that rotates in the pump chamber by means of a gear formed by a helical gear wheel and a mating gear wheel. The gear has stemmed support on one side and has, on the other side, an oblique anterior surface area that bears against a lifting stud disposed off center to the pistion longitudinal axis of the piston . When the piston rod is rotated, an axial movement is produced which is utilized for pumping. An axially adjustable stop allows different strokes of the pump piston to be set. This lubricant feed means is usually flange-mounted on the internal combustion engine, together with the fuel injection means as a secondary unit.
German patent No. DE 37 35 711 A1, teaches a portable, manually controlled apparatus powered by a two-stroke engine, such as a powered saw or the Like, with a pneumatically operated injection pump for the injection of fuel and a suction pipe to control the air mix for combustion, and having a handle-bearing housing designed for minimal vibration and ease of carrying and guiding. This apparatus has an injection pump that disposed separately from the two-stroke engine in the handle-bearing housing and that is connected with the two-stroke engine by means of non-rigid connections.
In German patent No. DD-PS 41 648, lubrication pumps for internal combustion engines are disclosed that possess two consecutively mounted, revolving piston-controlled feed units. These pumps initiate the constant travel of a cam plate gear which is greatly reduced relative to the rotational speed of the engine. The first feed unit supplies the lubricant and the second feed unit supplies the fuel. Both media are delivered as a mixture to the internal combustion engine, a two-stroke engine.
SUMMARY OF THE INVENTION
The present invention provides a compact assembly for equipment having a compact internal combustion engine assembly, fuel injection circuits and a high-pressure fuel feed mechanism, preferably in a chain saw possessing several, controllable lubrication circuits and a high-pressure fuel feed mechanism.
What is needed is a device that combines fuel injection and lubricant feed means in a space-efficient manner that is compatible with the compact engine design of hand-held, manually guided equipment.
The present invention provides a compact assembly for hand-held, manually guided equipment having a compact internal combustion engine assembly, fuel injection circuits and a high-pressure fuel feed mechanism and is particularly sited to a chain saw having these features.
Whereas the prior art provides fuel injection and lubricating means as separate devices for the type of equipment described above, the present invention effectively combines the fuel injection and lubrication means in the smallest possible space, by having a helical gear wheel in engagement with two mating gear wheels, each of which is connected to a drive shaft for a lubricant pump and/or a fuel pump and by using the crankshaft as the driving means. In one embodiment of the invention, the joint gears comprised by the crankshaft via the helical gear wheel and the mating gear wheels for the
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Matthees Klaus
Schulz Peter
Singer Andreas
Uhlig Ronald
Dolmar GmbH
Hynes William Michael
Solis Erick R.
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