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System used for high-pressure injection system and provided with overflow valve and measuring unit

A technology of metering unit and high-pressure injection, which is applied to the components of pumping devices for elastic fluids, charging systems, fuel injection pumps, etc., to achieve the effect of simple processing and favorable cost

Inactive Publication Date: 2013-06-05
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In this case, both the overflow valve and the metering unit require a separate connection to the high-pressure pump, in particular the high-pressure pump housing, as separate structural units, so that their production entails additional costs

Method used

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  • System used for high-pressure injection system and provided with overflow valve and measuring unit
  • System used for high-pressure injection system and provided with overflow valve and measuring unit
  • System used for high-pressure injection system and provided with overflow valve and measuring unit

Examples

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Embodiment Construction

[0034] exist figure 1 shows a cross-section through a high-pressure pump 1 for delivering fuel. The high-pressure pump 1 is used to deliver fuel, for example gasoline or diesel, to an internal combustion engine 39 at high pressure. The pressure that can be generated by the high-pressure pump 1 is, for example, in the range of 1000 to 3000 bar.

[0035] The high-pressure pump 1 has a drive shaft 2 with two cams 3 , which can perform a rotational movement about an axis of rotation 26 . The axis of rotation 26 is located at figure 1 in the plane of and perpendicular to figure 2 of the graphics. The piston 5 is mounted in a cylinder 6 formed by a housing 8 . Working chamber 29 is delimited by cylinder 6 , housing 8 and piston 5 . An inlet channel 22 with inlet valve 19 and an outlet channel 24 with outlet valve 20 open into a working chamber 29 . The fuel flows into the working chamber 29 via the inlet channel 22 and the fuel flows out of the working chamber 29 again under...

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Abstract

The invention relates to a system (62) used for a high-pressure injection system (36) and provided with an overflow valve (41) and a measuring unit (37). The overflow valve (41) comprises a valve housing (45) having a valve barrel (44); a closed piston (46) capable of moving inside the valve housing (45) to open or close the overflow valve (41); and an elastic valve element (51) connected with the closed piston (46) and used for applying a pressure force, the direction of which is opposite to that of a pressure force applied by fluid inside a barrel chamber (66) onto the closed piston (46), onto the closed piston (46) so as to move the closed piston between closed and open positions by virtue of the pressure forces applied by the elastic valve element (51) and the fluid. The measuring unit (37) comprises a measuring housing (38) having a measuring barrel (69) and a measuring piston (53) capable of moving inside the measuring housing (38) to open or close the measuring unit (37), wherein the valve housing (45) and the measuring housing (38) are formed integrally.

Description

technical field [0001] The invention relates to a system for a high-pressure injection system with an overflow valve and a metering unit and to a high-pressure injection system. Background technique [0002] In high-pressure injection systems for internal combustion engines, in particular common-rail injection systems for diesel or gasoline engines, a high-pressure pump is continuously responsible for maintaining the pressure in the high-pressure accumulator of the common-rail injection system. The high-pressure pump is driven, for example, by means of a camshaft of the internal combustion engine via a drive shaft. To feed fuel to the high-pressure pump, forward feed pumps are used, such as gear pumps or rotary distribution pumps, which are connected upstream of the high-pressure pump. The front transfer pump transfers fuel from the fuel tank to the high pressure pump through the fuel line. [0003] Piston pumps can also be used as high-pressure pumps. A drive shaft is su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M37/00F02M59/34F02M63/00
CPCF02M59/44F04B53/00F02M59/34F04B1/0421F02M37/00F02M59/46
Inventor I·胡特卡
Owner ROBERT BOSCH GMBH