A power tool has an internal combustion engine with a cylinder. An injection valve supplies fuel to the internal combustion engine. A fuel pump conveys fuel from a fuel tank to the injection valve. A fan wheel is provided that is driven by the internal combustion engine. The cylinder is arranged in
A power tool has an internal combustion engine with a cylinder. An injection valve supplies fuel to the internal combustion engine. A fuel pump conveys fuel from a fuel tank to the injection valve. A fan wheel is provided that is driven by the internal combustion engine. The cylinder is arranged in a first cooling zone of the power tool and the fan wheel conveys cooling air through the first cooling zone. The fuel pump is arranged in a second cooling zone of the power tool. Between the first cooling zone and the second cooling zone a buffer zone is arranged. The buffer zone is separated by at least one first partition from the first cooling zone and by at least one second petition from the second cooling zone.
대표청구항▼
1. A power tool comprising: an internal combustion engine comprising a cylinder;an injection valve supplying fuel to the internal combustion engine; a fuel tank; a fuel pump conveying fuel from the fuel tank to the injection valve, the fuel pump embodied separate from the injection valve;a fan wheel
1. A power tool comprising: an internal combustion engine comprising a cylinder;an injection valve supplying fuel to the internal combustion engine; a fuel tank; a fuel pump conveying fuel from the fuel tank to the injection valve, the fuel pump embodied separate from the injection valve;a fan wheel driven by the internal combustion engine;the power tool comprising a first cooling zone and a second cooling zone, wherein the cylinder is arranged completely in the first cooling zone of the power tool and does not project into the second cooling zone of the power tool, wherein the fan wheel conveys cooling air through the first cooling zone;wherein the fuel pump is arranged completely in the second cooling zone of the power tool and does not project into the first cooling zone of the power tool;wherein between the first cooling zone and the second cooling zone a buffer zone is arranged, wherein the buffer zone is separated by at least one first partition wall from the first cooling zone and by at least one second partition wall from the second cooling zone, wherein the buffer zone extends between the fuel pump and the cylinder and spatially separates the fuel pump from the cylinder so that excessive heating of the fuel pump is prevented. 2. The power tool according to claim 1, wherein the internal combustion engine takes in combustion air and wherein the second cooling zone is positioned in a flow path of the combustion air. 3. The power tool according to claim 2, further comprising an intake opening wherein the combustion air is taken in through the intake opening into the second cooling zone and the fuel pump is positioned in the flow path of the combustion air flowing in through the intake opening. 4. The power tool according to claim 3, wherein the fuel pump is arranged immediately adjacent to the intake opening. 5. The power tool according to claim 2, wherein the combustion air is directly taken in from the environment into the second cooling zone. 6. The power tool according to claim 1, wherein the fan wheel conveys cooling air through the buffer zone. 7. The power tool according to claim 1, wherein the injection valve is arranged in the buffer zone. 8. The power tool according to claim 7, further comprising a fuel pulsation damper arranged adjacent to the injection valve in the buffer zone. 9. The power tool according to claim 7, further comprising a fan wheel housing wherein the fan wheel is arranged in the fan wheel housing, wherein the injection valve is arranged in an area of the buffer zone that is connected by a connecting passage with the interior of the fan wheel housing. 10. The power tool according to claim 7, wherein the buffer zone has an antechamber and a main chamber, wherein the injection valve is arranged in the antechamber, wherein cooling air flows from the antechamber into the main chamber. 11. The power tool according to claim 10, wherein the antechamber is separated from the main chamber by an air guiding component, wherein the air guiding component is secured on a crankcase of the internal combustion engine, and wherein the cooling airflows from the antechamber between the air guiding component and the crankcase into the main chamber. 12. The power tool according to claim 1, further comprising a motor cover covering the cylinder of the internal combustion engine, wherein the at least one first partition wall is at least partially formed by a section of the motor cover, wherein the fan wheel conveys cooling air to a space underneath the motor cover. 13. The power tool according to claim 1, further comprising a tank housing wherein the fuel tank is formed in the tank housing. 14. The power tool according to claim 13, wherein the at least one second partition wall has at least one partition section and the at least one partition section is integrally formed on the tank housing. 15. The power tool according to claim 13, further comprising a first component delimiting an intake passage of the internal combustion engine, wherein the first component passes through the at least one second partition wall, and further comprising a second component that is secured on the tank housing, wherein the at least one second partition wall has at least one partition section that is formed on the second component. 16. The power tool according to claim 13, further comprising a drain passage extending through the at least one second partition wall, wherein the drain passage is adapted to drain liquid from the second cooling zone into the buffer zone. 17. The power tool according to claim 16, wherein the drain passage, relative to a flow direction of an air flow passing through the second cooling zone, is connected downstream of the fuel pump with the second cooling zone. 18. The power tool according to claim 13, further comprising at least one handle, the at least one handle separated from the internal combustion engine by a vibration gap, wherein the vibration gap allows for relative movement of the at least one handle relative to the internal combustion engine, wherein the vibration gap extends between the tank housing and the internal combustion engine and the vibration gap extends through the buffer zone. 19. The power tool according to claim 2, further comprising an air purification unit and an intake opening, wherein combustion air that is sucked in through the intake opening flows across the fuel pump, flows from the fuel pump to the air purification unit, and flows from the air purification unit into an intake passage of the internal combustion engine. 20. A power tool comprising: an internal combustion engine comprising a cylinder;an injection valve supplying fuel to the internal combustion engine;a fuel tank embodied completely separate from the injection valve;a fuel pump conveying fuel from the fuel tank to the injection valve, the fuel pump embodied separate from the injection valve;a fan wheel driven by the internal combustion engine;wherein the cylinder is arranged in a first cooling zone of the power tool and wherein the fan wheel conveys cooling air through the first cooling zone;wherein the fuel pump is arranged in a second cooling zone of the power tool;wherein between the first cooling zone and the second cooling zone a buffer zone is arranged, wherein the buffer zone is separated by at least one first partition wall from the first cooling zone and by at least one second partition wall from the second cooling zone;wherein the fuel pump is arranged on the fuel tank;wherein the fuel tank is separated from the internal combustion engine by a vibration gap, wherein the vibration gap allows for relative movement of the fuel tank relative to the internal combustion engine;wherein the fuel pump is positioned remote from the cylinder of the internal combustion engine and is separated from the cylinder by the vibration gap so that the fuel pump is arranged spatially separated from the cylinder and an excessive heating of the fuel pump is prevented. 21. A power tool comprising: an internal combustion engine comprising a cylinder;an injection valve supplying fuel to the internal combustion engine;a fuel tank;a fuel pump conveying fuel from the fuel tank to the injection valve, the fuel pump embodied separate from the injection valve;a fan wheel driven by the internal combustion engine;wherein the cylinder is arranged in a first cooling zone of the power tool and wherein the fan wheel conveys cooling air through the first cooling zone;wherein the fuel pump is arranged in a second cooling zone of the power tool;wherein between the first cooling zone and the second cooling zone a buffer zone is arranged, wherein the buffer zone is separated by at least one first partition wall from the first cooling zone and by at least one second partition wall from the second cooling zone;wherein the second cooling zone is positioned in a flow path of combustion air sucked in by the internal combustion engine through an intake opening of the power tool, wherein the combustion air flows in from the environment through the intake opening into the second cooling zone and from the second cooling zone to the internal combustion engine and acts as cooling air in the second cooling zone;wherein the fuel pump is arranged in a flow path of the combustion air that is flowing in through the intake opening and the fuel pump is directly cooled by the combustion air flowing in from the environment into the second cooling zone. 22. The power tool according to claim 21, wherein the intake opening of the power tool through which the combustion air flows into the second cooling zone is separated from an intake opening of the cooling air that is sucked in by the fan wheel.
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이 특허에 인용된 특허 (17)
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Maier, Georg; Layher, Wolfgang; Neumaier, Thomas; Schieber, Eberhard; Abou Aly, Mohamed, Ignition device for an internal combustion engine and method for its operation.
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