US3646925A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crankcase ventilation
Assignee: Old Carco LLC
•
Filing: 1970-06-24
•
Granted: 1972-03-07
•
Expires: 1990-06-24
Abstract
Abstract The crankcase for an internal combustion engine is vented to the fuel-air inlet induction passage via a ventilation valve comprising a tubular L-shaped valve housing having a comparatively small metering orifice which cooperates with a movable valve element responsive to decreasing pressure in the induction conduit for restricting the orifice. A coil spring yieldingly opposes closing movement of the valve element and is seated on a spring retainer adjustably mounted in an opening through the sidewall of the housing at the exterior angle of its elbow to effect a predetermined rate of gas flow through the orifice when a predetermined low-pressure differential corresponding to part load operation of the engine is applied across the orifice. A movement limiting plunger extends adjustably through the retainer to engage and limit closing movement of the valve element to effect a predetermined low rate of gas flow through the orifice when a predetermined highpressure differential is applied across the orifice corresponding to engine idling.
Inventors
- 👤 Robert W Eshelman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:05
CPC Classifications
F; F01; F01M; F01M13/00; F01M13/02; F01M13/021; F01M13/022; F01M13/023; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7748; Y10T137/7749
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
333 words
In a crankcase ventilating device for controlling the flow of gases from the crankcase to the fuel-air inlet induction conduit of an internal combustion engine to effect a predetermined low rate of flow when a large pressure differential exists between said crankcase and conduit corresponding to idle operation of said engine and to effect an increasing rate of flow when said pressure differential decreases within a range of pressures corresponding to part load operation of said engine, a. a valve housing having a passage for gases extending therethrough and opening at upstream and downstream ends adapted respectively for connection with said crankcase and conduit, said passage defining a metering orifice, b. valve means in said housing including movable means responsive to an increasing pressure differential thereacross for progressively restricting said orifice, c. resilient means having opposed ends, one end engaging said movable means for yieldingly opposing its movement in the direction for restricting said passage, d. means for bodily adjusting the position of the other of said ends in said direction to calibrate said resilient means and effect a predetermined flow through said passage when a predetermined pressure differential is applied thereacross comprising retaining means adjusted in said direction within an opening through the sidewall of said housing and engaging said other end to oppose movement thereof when said one end is opposing movement of said movable means in said direction, e. means on said retaining means for adjusting the effective spring rate of said resilient means comprising a screw threaded portion having its axis extending in said direction, said resilient means comprising a coil spring adjustably screwed on said threaded portion, said retaining means completely closing said opening and being rotatable therein, f. means on said retaining means engageable from the exterior of said housing for rotating said retaining means within said opening, and g. means for securing said spring against rotation within said housing for effecting axial adjustment of said spring on said threaded portion upon rotation of said retaining means.
Claim 2
Dependent Claim
333 words
In a crankcase ventilating device for controlling the flow of gases from the crankcase to the fuel-air inlet induction conduit of an internal combustion engine to effect a predetermined low rate of flow when a large pressure differential exists between said crankcase and conduit corresponding to idle operation of said engine and to effect an increasing rate of flow when said pressure differential decreases within a range of pressures corresponding to part load operation of said engine, a. a valve housing having a passage for gases extending therethrough and opening at upstream and downstream ends adapted respectively for connection with said crankcase and conduit, said passage defining a metering orifice, b. valve means in said housing including movable means responsive to an increasing pressure differential thereacross for progressively restricting said orifice, c. resilient means having opposed ends, one end engaging said movable means for yieldingly opposing its movement in the direction for restricting said passage, d. means for bodily adjusting the position of the other of said ends in said direction to calibrate said resilient means and effect a predetermined flow through said passage when a predetermined pressure differential is applied thereacross comprising retaining means adjusted in said direction within an opening through the sidewall of said housing and engaging said other end to oppose movement thereof when said one end is opposing movement of said movable means in said direction, e. means on said retaining means for adjusting the effective spring rate of said resilient means comprising a screw threaded portion having its axis extending in said direction, said resilient means comprising a coil spring adjustably screwed on said threaded portion, said retaining means completely closing said opening and being rotatable therein, f. means on said retaining means engageable from the exterior of said housing for rotating said retaining means within said opening, and g. means for securing said spring against rotation within said housing for effecting axial adjustment of said spring on said threaded portion upon rotation of said retaining means.
Claim 3
Dependent Claim
26 words
In the combination according to claim 1, the portion of said retaining means within said opening being cylindrical and being slidably adjustable axially within said opening.
Claim 4
Dependent Claim
29 words
In the combination according to claim 1, said retaining means having a screw threaded portion in adjustable screw threaded engagement with the portion of said housing defining said opening.
Claim 5
Dependent Claim
32 words
In the combination according to claim 3, said housing having an elbow downstream of said orifice, said opening extending through the sidewall of said housing at the exterior angle of said elbow.
Claim 6
Dependent Claim
36 words
In the combination according to claim 1, said housing having an elbow downstream of said orifice, said opening extending axially of said orifice through the sidewall of said housing at the exterior angle of said elbow.
Claim 7
Dependent Claim
71 words
In the combination according to claim 5, means for limiting the maximum restriction for said orifice comprising an axially adjustable movement limiting plunger extending axially in said direction through said retaining means in sealing engagement therewith and into the path of said movable means to engage and limit the movement thereof in said direction, said plunger having a portion accessible from the exterior of said housing for adjusting said plunger axially.
Claim 8
Dependent Claim
38 words
In the combination according to claim 5, said threaded portion being within said housing coaxial with said orifice, and said means for securing said spring against rotation within said housing including a portion adjustable axially of said housing.
Claim 9
Dependent Claim
26 words
In the combination according to claim 7, the portion of said retaining means within said opening being cylindrical and being slidably adjustable axially within said opening.
Claim 10
Dependent Claim
29 words
In the combination according to claim 7, said retaining means having a screw threaded portion in adjustable screw threaded engagement with the portion of said housing defining said opening.
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) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |