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Common rail

A common rail and bushing technology, applied in the common rail field, can solve problems such as faulty sliding, burr A entry, faulty sealing, etc.

Inactive Publication Date: 2012-01-25
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When a small press-fitting burr A passes through the mesh of the filter of the injector, it is possible that the burr A enters the high-precision injector and causes malfunctions such as malfunctioning sliding and malfunctioning sealing

Method used

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Embodiment Construction

[0029] refer to figure 1 , shows the system configuration of the accumulator fuel injection system according to the first embodiment of the present invention. figure 1 The shown accumulator fuel injection system is a system for injecting fuel into individual cylinders of an engine (such as a diesel engine, not shown). The system includes common rail 1, injector 2, supply pump 3, ECU4 (engine control unit), EDU5 (drive unit) and so on. EDU5 can be installed in the case of ECU4.

[0030] The common rail 1 is an accumulator for accumulating high-pressure fuel to be supplied to the injector 2 . In order to accumulate high-pressure fuel at a common rail pressure corresponding to the fuel injection pressure, the common rail 1 is connected to a discharge hole of a supply pump 3 that pumps high-pressure fuel through a high-pressure pump pipe 6 . The common rail 1 is connected to a plurality of injector pipes 7 for supplying high-pressure fuel to the respective injectors 2 .

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PUM

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Abstract

A small-diameter circular column portion having a diameter slightly smaller than that of a small-diameter hole (press-fitting hole) of an inside-outside communication hole is formed at a press-fitting end portion of a bush. A narrow annular clearance is formed between the small-diameter circular column portion and the small-diameter hole when the bush is press-fitted. Even if a press-fitting burris produced at the press-fitting end portion during manufacturing of a common rail, the press-fitting burr is confined in the depth of the annular clearance. Even when fuel flows through the inside-outside communication hole during engine operation, movement of the fuel and the fuel flow acting on the press-fitting burr are limited in the depth of the annular clearance, inhibiting the press-fitting burr from dropping out or flowing out. Thus, a highly reliable common rail can be provided at low cost.

Description

technical field [0001] The present invention relates to a common rail which is mounted to an accumulator type fuel injection system and which accumulates high-pressure fuel. Background technique [0002] The following will refer to Figure 14 The common rail 101 of the related art is described. The common rail 101 is an accumulator for accumulating high-pressure fuel pumped from a high-pressure fuel pump (supply pump, etc.), and has an accumulation chamber (center hole) 123 formed therein for accumulating high-pressure fuel therein. The common rail 101 has pipe joints 121 to be connected with external pipes (high pressure pump pipes, injector pipes, etc.). The central portion of the outer end portion of the pipe joint 121 communicates with the pressure accumulation chamber 123 through the inner-outer communication hole 124 (branch hole). [0003] An orifice 130 for reducing pressure pulsation caused by the injection operation of the injector, or an orifice 130 for reducing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M55/02
Inventor 长坂知明横谷浩之
Owner DENSO CORP