US3829014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injector having self-cleaning filter
Assignee: Stanadyne LLC
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Filing: 1972-11-29
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Granted: 1974-08-13
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Expires: 1992-11-29
Abstract
Abstract A precision fuel injector having an inwardly opening pressure operated valve positioned in a bore forming a valve chamber and guided for reciprocal movement to open and close the valve wherein the valve guide at the end of the valve chamber opposite the valve tip is provided with a sleeve extending into the valve chamber to provide an integral filter. The sleeve is interposed between the fuel inlet and the valve chamber and provides communication therebetween through a pair of annular clearances having a width which is one-half or less of the diameter of the discharge orifices of the injector to trap solid particles and prevent the blockage thereof. The filter construction retains the trapped particles in the flow path where the velocity of fuel flow is maximum to subject them to the repetitive high pressure hydraulic forces as sequential measured charges of fuel are delivered to the injector to hammer them against the hardened metal edge of the filter and pulverize them to render the filter self-cleaning.
Inventors
- 👤 C Davis
- 👤 V Roosa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 03:45
CPC Classifications
F; F02; F02M; F02M61/00; F02M61/04; F02M61/10; F02M61/12; F02M61/16; F02M61/165
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
126 words
In a fuel injector, a tubular body having a valve chamber, a valve guide mounting a pressure operable valve disposed in the valve chamber and a spring biasing the valve toward a valve seat having a discharge orifice, the improvement wherein the valve guide is provided with a generally cylindrical sleeve extending into the valve chamber, said sleeve being interposed in the flow path of the fuel from the injector inlet to the valve chamber, the outer periphery of said sleeve having a pair of spaced annular peripheral ribs separated by an annulus accommodating the free flow of fuel therein, said peripheral ribs cooperating with the inner periphery of said tubular body to provide parallel restricted passages providing communicating between said annulus and said valve chamber.
Claim 2
Dependent Claim
126 words
In a fuel injector, a tubular body having a valve chamber, a valve guide mounting a pressure operable valve disposed in the valve chamber and a spring biasing the valve toward a valve seat having a discharge orifice, the improvement wherein the valve guide is provided with a generally cylindrical sleeve extending into the valve chamber, said sleeve being interposed in the flow path of the fuel from the injector inlet to the valve chamber, the outer periphery of said sleeve having a pair of spaced annular peripheral ribs separated by an annulus accommodating the free flow of fuel therein, said peripheral ribs cooperating with the inner periphery of said tubular body to provide parallel restricted passages providing communicating between said annulus and said valve chamber.
Claim 3
Dependent Claim
169 words
In a fuel injector, a tubular body having a valve chamber, a valve guide mounting a pressure operable valve disposed in the valve chamber and a spring biasing the valve toward a valve seat having a discharge orifice, the improvement wherein the valve guide is provided with a generally cylindrical sleeve extending into the valve chamber, said sleeve being interposed in the flow path of the fuel from the injector inlet to the valve chamber and defining with the inner periphery of said tubular body a restricted clearance providing communication between said inlet and said valve chamber, the width of said clearance being less than the diameter of said discharge orifice and means for maintaining the debris trapped by the filter at the entrance to said clearance where it is subjected to the maximum velocity of flow of fuel from the inlet to the valve chamber thereby to maximize the impact forces applied to the debris to pulverize the same and render the filter provided by the sleeve self-cleaning.
Claim 4
Dependent Claim
169 words
In a fuel injector, a tubular body having a valve chamber, a valve guide mounting a pressure operable valve disposed in the valve chamber and a spring biasing the valve toward a valve seat having a discharge orifice, the improvement wherein the valve guide is provided with a generally cylindrical sleeve extending into the valve chamber, said sleeve being interposed in the flow path of the fuel from the injector inlet to the valve chamber and defining with the inner periphery of said tubular body a restricted clearance providing communication between said inlet and said valve chamber, the width of said clearance being less than the diameter of said discharge orifice and means for maintaining the debris trapped by the filter at the entrance to said clearance where it is subjected to the maximum velocity of flow of fuel from the inlet to the valve chamber thereby to maximize the impact forces applied to the debris to pulverize the same and render the filter provided by the sleeve self-cleaning.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |