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US 4,928,887 AGranted
Cylindrical guide device with operating play compensation for fuel injection system
AssigneeRenault Vehicules Industriels
InventorMarc Miettaux
Life of this patent
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Abstract
A male part such as a needle valve (1) is guided in a bore such as that of a nozzle (2) in a manner such that male part exhibits a passage function of a pressurized fluid (1A) and the bore works with a volume (3, 6) subjected to the effect of the pressure.
Claims9
A pressurized fluid transfer system comprising:
- a nozzle having a cylindrical bore;
- a needle valve slidably positioned in said bore with sufficient play for said needle valve to freely slide in said bore;
- and
- means for transferring a pressurized fluid to said needle valve, comprising:
- (a) an annular volume in said nozzle, a side of said volume facing said bore having a surface area whose value comprises a major portion of the value of the surface area of said bore,
- (b) means for communicating said volume with a source of the pressurized fluid, and
- (c) passage means traversing said play for communicating said volume with said needle valve whereby said pressurized fluid can fill said play;
- wherein a length of said volume along the axis of said bore is selected to be sufficient that a pressure of pressurized fluid therein substantially cancels any increase in said play due to distortions of said nozzle resulting from said pressurized fluid in said play.
5 more elements
Dependencies are inferred from the claim text.