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Injection fuel pressure intensifier

A supercharging device and fuel technology, applied to fuel injection devices, charging systems, machines/engines, etc., can solve problems such as increased energy loss and increased leakage of fuel

Inactive Publication Date: 2009-04-08
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, as described above, if the end space formed on the end face of the large-diameter piston on the side of the medium-diameter piston is always in communication with the fuel discharge port, leakage from the pressure control chamber into the end space through the periphery of the large-diameter piston and then Leaked fuel discharged from the fuel discharge port, and leaked fuel leaked from the high-pressure chamber into the end space through the periphery of the middle-diameter piston and then discharged from the fuel discharge port will increase, thereby generating pressure for increasing the pressure of the fuel. The problem of increased loss of energy

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  • Injection fuel pressure intensifier
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  • Injection fuel pressure intensifier

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Embodiment Construction

[0036] FIG. 1 schematically shows the entirety of the fuel injection device. In FIG. 1 , a portion 1 surrounded by a dotted line represents a fuel injection valve mounted on an engine. As shown in FIG. 1 , the fuel injection device includes a common rail 2 for storing high-pressure fuel, and fuel in a fuel tank 3 is supplied to the common rail 2 by a high-pressure fuel pump 4 . The fuel pressure in the common rail pipe 2 is maintained at the target fuel pressure corresponding to the engine operating state by controlling the discharge amount of the high-pressure fuel pump 4, and the high-pressure fuel in the common rail pipe 2 maintained at the target fuel pressure , is supplied to the fuel injection valve 1 via the high-pressure fuel supply passage 5 .

[0037] As shown in FIG. 1 , the fuel injection valve 1 is provided with a nozzle portion 6 for injecting fuel into the combustion chamber; an injection fuel booster 7 for increasing the pressure of the injected fuel; and a thr...

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Abstract

An injection fuel pressure intensifier (7) has a large-diameter piston (18), an intermediate-diameter piston (19), and a small-diameter piston (20). A high-pressure chamber (22) always filled with high pressure is formed at an outer end section of the intermediate-diameter piston (19), and a pressure intensification chamber (23) is formed at an outer end section of the small-diameter piston (20). A pressure control chamber (24) is formed on an end surface of the large-diameter piston (18), on the small-diameter piston (20) side. When high-pressure fuel is supplied into the pressure control chamber (24), the large-diameter piston (18) moves to the intermediate-diameter piston (19) side, or to a pressure intensification preparation position. At this time, a leakage fuel outlet opening (33) is closed by the end surface of the large-diameter piston (18).

Description

technical field [0001] The invention relates to a fuel injection supercharging device. Background technique [0002] In a fuel injection device equipped with a common rail, the following injection fuel booster device has been disclosed (see US Patent No. 5852997). It has: a large diameter piston slidably inserted into a large diameter cylinder chamber; and a medium diameter piston formed at one end of the large diameter piston; and a small diameter piston connected to the other end of the large diameter piston, at the outer end of the medium diameter piston A high-pressure chamber filled with high-pressure fuel in the common rail is formed on the end surface of the common rail pipe, and a pressurization chamber for increasing the injection fuel pressure is formed on the end surface of the outer end of the small-diameter piston. On the end surface of the small-diameter piston side of the large-diameter piston A pressure control chamber is formed on it. [0003] In the injec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M47/00F02M61/16F02M61/10
CPCF02M47/027F02M57/025F02M63/0045F02M57/026
Inventor 山田贵文渡边义正富田浩邦山本义久
Owner TOYOTA JIDOSHA KK