High-pressure pump for a fuel system of an internal combustion engine

a fuel system and high-pressure pump technology, which is applied in the direction of fuel injecting pumps, machines/engines, mechanical equipment, etc., can solve the problems of high flow rate when the inlet valve device is open, and achieve the effects of reducing friction, improving axial mobility of the actuation tappet, and reducing friction

Inactive Publication Date: 2010-08-19
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is a high-pressure pump for a fuel system of an internal combustion engine that is more economical and has a longer service life. It achieves this by improving the flow of fuel through the valve by positioning the valve element relative to the valve seat, reducing turbulence and increasing the flow rate when the inlet valve device is open. The positioning means can include a spherical or conical first contact region that helps to reduce flow deflection and wear. The actuation tappet can be supported in "overhung" fashion, reducing friction and improving axial mobility. The actuation tappet and valve clement can be separate parts that are fixed radially to one another to ensure uniform flow around the valve element. The positioning means can include conical fixation means and a damping spring to prevent impact and noise. Overall, the invention provides a more efficient and reliable high-pressure pump for fuel systems.

Problems solved by technology

This leads to reduced turbulence of a fuel flowing past the valve element, resulting in a higher flow rate when the inlet valve device is open.

Method used

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  • High-pressure pump for a fuel system of an internal combustion engine
  • High-pressure pump for a fuel system of an internal combustion engine
  • High-pressure pump for a fuel system of an internal combustion engine

Examples

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Embodiment Construction

[0021]FIG. 1 shows a fuel system 1 of an internal combustion engine in a highly schematic illustration. A high-pressure pump 3 communicates with a fuel tank 9 upstream via an intake line 4, a prefeed pump 5, and a low-pressure line 7. Downstream, a high-pressure reservoir 13 (“rail”13) is connected to the high-pressure pump 3 via a high-pressure line 11. The high-pressure pump 3 has an inlet valve device 14 with an electromagnetic actuation device 15. The inlet valve device 14 is disposed hydraulically between the low-pressure line 7 and a pump cylinder 17. Inlet openings 16 of the inlet valve device 14 are connected to the low-pressure line 7, and the pump cylinder 17 communicates with outlet openings 18 of the inlet valve device 14. The pump cylinder 17 and the high-pressure line 11 communicate with one another via an outlet valve 19 embodied as a check valve. The pump cylinder 17 and a piston 21 supported displaceably in it define a work chamber 23. The piston 19 is acted upon by...

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Abstract

The invention relates to a high-pressure pump for a fuel system of an internal combustion engine, having at least one inlet valve device with a valve element, a valve seat for the valve element, and an actuating tappet which can positively push the valve element in an opening direction. In order to create a high-pressure pump for a fuel system of an internal combustion engine which can be produced even more cost-effectively and which has a lower level of wear and therefore a longer service life, it is proposed that the valve element have a positioning mechanism which centers the valve element on the valve seat when the valve element comes into contact or is in contact with the valve seat.

Description

PRIOR ART[0001]The invention relates to a high-pressure pump for a fuel system of an internal combustion engine, having at least one inlet valve device with a valve element, a valve seat for the valve element, and an actuation tappet, which can press the valve element by force in an opening direction.[0002]It is known to embody high-pressure pumps with such inlet valve devices, also known as quantity control valves. Such known quantity control valves have means for precise radial guidance of an actuation tappet and typically include a valve element with a flat seat. Moreover, for varying a pumping rate of the high-pressure pump, they can either be kept in an open position, or put into such an open position by force, by means of current supplied to an electromagnetic actuation device. Such quantity control valves are therefore also called quantity control valves that are closed when without current.DISCLOSURE OF THE INVENTION[0003]It is the object of the invention to create a high-pr...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): F01L1/14
CPCF02M63/0017F02M63/0035F02M63/004F02M63/0022F02M63/0071F02M2200/02F02M59/367F02M63/007
InventorSCHROEDER, BERNDBECKER, MARKUSSCHNALZGER, GUENTHERKIRSCHNER, MARTIN
OwnerROBERT BOSCH GMBH