High-pressure pump for a fuel injection device
A fuel injection device and injection device technology, applied in pumps, multi-cylinder pumps, liquid displacement machines, etc., can solve problems such as increased wear and tear, and achieve the effects of precise work, reduced friction, and improved efficiency
Inactive Publication Date: 2013-06-12
ROBERT BOSCH GMBH
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Problems solved by technology
This increased friction affects the rotational movement of the rollers, whereby slippage and increased wear can occur between the rollers and the eccentric
Method used
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Embodiment Construction
[0020] figure 1 shows a high-pressure pump 1 for a fuel injection system of an internal combustion engine, which is preferably intended for a common rail injection system of an internal combustion engine. The fuel is delivered under pressure by the high-pressure pump 1 to a not-shown accumulator (rail), from which fuel is injected in a targeted manner via fuel injectors into the associated combustion chambers of the internal combustion engine. The high-pressure pump 1 forms a radial piston pump which is inserted as a plug-in pump with a plug-in pump body 2 into a motor body 3 or its housing. Also connected to the plug-in pump body 2 is a low-pressure unit 4 called a cylinder head. A drive shaft rotatable in the engine block 3 with an axis 5 is connected to an eccentric 6 whose center axis 7 has an eccentricity S relative to the axis 5 . The drive shaft can be a shaft of the internal combustion engine, for example its camshaft or differential shaft.
[0021] The eccentric 6 ...
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The invention relates to a high-pressure pump (1) of a fuel injection device, which can be used in particular for a common rail injection device of an internal combustion engine. The high-pressure pump (1) comprises a pump shaft or drive shaft, which is connected to an eccentric (6) in a rotationally rigid manner, and at least one pump element (8). The pump element (8), including a bucket tappet (13), a piston element (12) and a tappet spring (14), is inserted into a housing bore (16) of an engine block (3). The bucket tappet (13), on which the tappet spring (14) acts, is connected to the piston element (12), which is guided such that it can be moved in a reciprocating manner in a cylinder bore (19) of a shaft section (20) and which delimits a pump working chamber (21) connected to a suction valve (22) and a high-pressure valve (23). A drive connection between the bucket tappet (13) and the eccentric (6) comprises a running ring (9) rotatably mounted on the eccentric (6), on which the sliding plate (18) of the bucket tappet (13) is supported in a force-closed manner.
Description
technical field [0001] The invention relates to a high-pressure pump for a fuel injection system, which can be used in particular for a common rail injection system of an internal combustion engine. The high-pressure pump comprises a pump shaft or drive shaft, which is non-rotatably connected to an eccentric and is functionally connected to the pump components. The pump unit comprising a cup-shaped pushrod, a component piston and a pushrod spring is disposed in the housing bore of the engine block. The part piston, which is drive-connected to the eccentric via a cup-shaped plunger and is guided up and down in a cylinder bore, defines a pump working chamber which is connected to the suction valve and the high-pressure valve. Background technique [0002] Such high-pressure pumps are used in motor vehicle construction in order to provide the necessary volume flow and the required fluid pressure for common rail fuel injection systems. High-pressure pumps are subjected to stro...
Claims
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IPC IPC(8): F04B1/04
CPCF04B1/0417F04B1/0426F04B1/0439
Inventor A·舍茨M·舍特尔
Owner ROBERT BOSCH GMBH