Internal-combustion engines – Cooling – Engine or cylinder-mounted heat dissipators
Patent
1999-03-08
2000-07-04
Solis, Erick
Internal-combustion engines
Cooling
Engine or cylinder-mounted heat dissipators
123 4165, F01P 102
Patent
active
060823127
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL AREA
The invention relates to a hand-operated tool, more particularly cutting disks, brush cutters or the like, with an internal combustion engine, preferably a two-stroke engine with electronic direct injection of the fuel, which is provided with a cooling fan disposed on the crankshaft and, within the area of the cylinder, with a cooling air guidance means which brings about a flow along the crankshaft axis.
STATE OF THE ART
When fuel is injected into the internal combustion engine, it is attempted to perform this in such a way that a good mixture preparation with a simultaneous optimization of the waste gas quality is achieved.
In the DE 41 42 354 A1, a tool is disclosed which possesses a block of injection pumps that is secured to a mounting plate separating the intake section for the combustion air from the engine space. However, this leads to an increased thermal stress of the injection pump block since the latter forms a compact unit with the mounting plate so that the waste heat from the engine space is passed on direct to the parts carrying fuel, whereby a gassing of the fuel results.
Also from the DE 37 35 711 A1, a hand-operated tool is known. In this tool, the injection pump is flexibly connected with the engine so as to avoid mechanical and thermal stresses acting upon the injection pump. But it is preciselythe flexible connection which harbours new problems because the flexible pipeline makes an exact control difficult and since, on account of it being routed through non-cooled regions--close to the engine--the risk of the fuel being gassed likewise exists.
DESCRIPTION OF THE INVENTION
That is why the technical problem of the invention is to optimize two-stroke internal combustion engines of the type in question or their fuel injection.
This technical problem is resolved by the features characterized in the claim 1.
To this end provision is made according to the invention, particularly in power chain saws wherein the cylinder is disposed so as to be arranged vertically or inclined relative to the chain blade axis, for the intake chamber with the filter to be located on the side of the handle and for the cooling blower or fan to be mounted on the crankshaft, while a cooling air guidance means is allocated to the cylinder, this brings about a flow along the axis of the crankshaft, for a partition adjacent to the cylinder separating the continguous intake chamber from the cooling air guidance means and for disposing the fuel injection valve above the inlet duct for the drawn-in air in the cylinder, by preference with an inclination toward the cylinder head and while penetrating the partition.
Preferably, an intake section secured to the cylinder with the inlet duct, is constructed so as to overlap the fuel injection valve above the inlet duct and as a pressure element for the same.
According to a preferred embodiment, the intake section is equipped with current supply contacts for the electronically controlled fuel injection valve, in which case the intake section can incorporate the fuel supply or fuel evacuation for the electromagnetically controlled fuel injection valve.
Furthermore, the intake section may be provided with an air filter and/or an air guidance path with a device for cooling the fuel.
According to a further preferred embodiment, the intake section is equipped with a multipoint plug on an intake air housing, which also forms the partition to the cylinder, in the operational state it is in engagement, while the intake air housing possesses the controller for supplying the internal combustion engine.
More especially a power chain saw, with an internal combustion engine and a fuel injection system is often intergrated into the housing of the tool, as well as the fuel tank and a supply container for lubricating oil and the cooling air guidance means.
In fuel injection systems in motor vehicles it is known to dispose the pressure controller in the fuel tank direct or in the region of the fuel distribution on the engine in the engine space.
In a hand-controlled tool,
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Matthees Klaus
Mehlhose Uwe
Schoenhaar Jochen
Schulz Peter
Siepmann Walter
Dolmar GmbH
Solis Erick
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