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Differential expansion absorption mechanism and fuel injection valve comprising same

A technology of fuel injection valve and absorption mechanism, which is applied to fuel injection devices, machines/engines, mechanical equipment, etc., can solve problems such as differences in thermal expansion difference absorption performance, and achieve the effect of preventing overflow

Inactive Publication Date: 2009-06-10
ISUZU MOTORS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0026] Reason 4: Wear powder generated by the sliding of the hydraulic cylinder 102 and the piston 105 enters the viscous fluid, whereby the viscosity of the viscous fluid changes. difference in performance

Method used

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  • Differential expansion absorption mechanism and fuel injection valve comprising same
  • Differential expansion absorption mechanism and fuel injection valve comprising same
  • Differential expansion absorption mechanism and fuel injection valve comprising same

Examples

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Embodiment 1

[0045] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0046] This embodiment is an embodiment in which the expansion difference absorbing mechanism of the present invention is applied to a fuel injection valve for injecting gaseous fuel such as compressed natural gas (CNG), propane gas, or hydrogen into a combustion chamber of an engine.

[0047] figure 1 is a sectional view of a fuel injection valve having the expansion difference absorbing mechanism of this embodiment, figure 2 Yes figure 1 A partially enlarged cross-sectional view.

[0048] like figure 1 As shown, the fuel injection valve 1 of this embodiment has: a hydraulic cylinder (chamber) 3, which is movably accommodated in a relatively long sleeve (housing) 2; a piston 7, which is movably accommodated in the The hydraulic cylinder 3 is divided into an upper chamber 5 and a lower chamber 6; the non-compressible viscous fluid ...

Embodiment 2

[0088] Next, another embodiment of the present invention will be described in detail with reference to the drawings.

[0089] This embodiment is an embodiment in which the differential expansion absorbing mechanism of the present invention is applied to a fuel injection valve for injecting gaseous fuel such as compressed natural gas (CNG), propane gas, or hydrogen into a combustion chamber of an engine.

[0090] 3 is a sectional view of a fuel injection valve having an expansion difference absorbing mechanism according to an embodiment of the present invention, Figure 4 It is a partially enlarged view of Fig. 3 .

[0091] As shown in FIG. 3 , the fuel injection valve 1 of this embodiment has: a hydraulic cylinder (chamber) 3 movably accommodated in a long-sized sleeve (housing) 2; a piston 7 movably It is accommodated in the hydraulic cylinder 3 and divided into the upper chamber 5 and the lower chamber 6; the non-compressible viscous fluid is filled in the upper chamber 5 a...

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PUM

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Abstract

The present invention provides a fuel injection valve which moves a needle valve ( 10 ) via a viscous fluid and a piston ( 7 ) by having an actuator ( 9 ) move a cylinder ( 3 ). The fuel injection valve comprises a sealing member ( 27 ) for sealing a gap between the cylinder ( 3 ) and piston, and a linking hole ( 29 ) formed in the piston for connecting two chambers ( 5, 6 ) to each other. The size and / or shape of the linking hole is set such that when a force for moving the cylinder or piston at a lower speed than the driving speed of the actuator is generated due to differential thermal expansion between members, the viscous fluid moves between the two chambers through the linking hole, and when a force for moving the cylinder at a higher speed than the force generated by the differential thermal expansion is generated by the actuator, the viscous fluid cannot pass through the linking hole.

Description

technical field [0001] The present invention relates to an expansion difference absorbing mechanism for absorbing a thermal expansion difference between members, and a fuel injection valve having the expansion difference absorbing mechanism. Background technique [0002] In a mechanism with long parts, due to the difference in the thermal expansion coefficient (material) of each part and the temperature difference of each part, a large difference in thermal expansion occurs between the parts, and the desired operation may not be obtained. . As a mechanism having such an elongated member, a fuel injection valve mounted on a cylinder head or the like of an engine is exemplified. [0003] For example, as shown in FIG. 7 , the fuel injection valve 100 for gaseous fuel under development by the present inventors has: a hydraulic cylinder 102 slidably accommodated in a long sleeve 101; 102 is divided into upper chamber 103 and lower chamber 104; viscous fluid (indicated by dots) ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M51/06F02M61/02F02M21/02F02M51/00F02M61/10
CPCY02T10/32Y02T10/30
Inventor 冈田正贵
Owner ISUZU MOTORS LTD