US4102314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crankcase ventilation
Assignee: Old Carco LLC
•
Filing: 1977-03-30
•
Granted: 1978-07-25
•
Expires: 1997-03-30
Abstract
Abstract A gas make-up conduit extends to the crankcase of an internal combustion engine from the latter's fuel and air supply conduit at a location upstream of the throttle valve in said conduit and downstream of the fuel supply into said conduit to supply a mixture of fuel and air to the crankcase in the same ratio that is supplied to the engine, thereby to replace gases that are recycled according to conventional practice from the crankcase into the induction conduit downstream of the throttle valve.
Inventors
- 👤 Jorma O. Sarto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:17
CPC Classifications
F; F01; F01M; F01M13/00; F01M13/02; F01M13/021; F01M13/022; F01M13/023
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
167 words
In an internal combustion engine having a combustion chamber comprising a cylinder opening into a crankcase, a piston movable within said cylinder and separating the combustion chamber from the crankcase, a fuel-air supply conduit, throttle means in said conduit, means for effecting a mixture of fuel and air in a predetermined ratio in said conduit upstream of said throttle means, and means for connecting said conduit downstream of said throttle means with said combustion chamber for supplying said mixture thereto, the combination of means for recirculating piston blow-by gases from said crankcase into said supply conduit at approximately said predetermined ratio of fuel and air comprising first conduit means for connecting said crankcase with said supply conduit at a location downstream of said throttle means, and second conduit means connecting said crankcase with said supply conduit at a location upstream of said throttle means for supplying said mixture to said crankcase whenever the pressure in the latter is less than the pressure upstream of said throttle means.
Claim 2
Dependent Claim
167 words
In an internal combustion engine having a combustion chamber comprising a cylinder opening into a crankcase, a piston movable within said cylinder and separating the combustion chamber from the crankcase, a fuel-air supply conduit, throttle means in said conduit, means for effecting a mixture of fuel and air in a predetermined ratio in said conduit upstream of said throttle means, and means for connecting said conduit downstream of said throttle means with said combustion chamber for supplying said mixture thereto, the combination of means for recirculating piston blow-by gases from said crankcase into said supply conduit at approximately said predetermined ratio of fuel and air comprising first conduit means for connecting said crankcase with said supply conduit at a location downstream of said throttle means, and second conduit means connecting said crankcase with said supply conduit at a location upstream of said throttle means for supplying said mixture to said crankcase whenever the pressure in the latter is less than the pressure upstream of said throttle means.
Claim 3
Dependent Claim
82 words
In the combination according to claim 1, means for effecting a predetermined minimum differential between the pressure in said crankcase and the pressure in said supply conduit upstream of said throttle means during predetermined operation of said engine comprising check valve means in said second conduit means for enabling comparatively unrestricted fluid flow therein from said supply conduit into said crankcase and for effecting a predetermined restriction to fluid flow in said second conduit means from said crankcase to said supply conduit.
Claim 4
Dependent Claim
46 words
In the combination according to claim 1, flow control valve means responsive to the differential between the pressure in said supply conduit downstream of said throttle means and the pressure in said crankcase for restricting said first conduit means as a function of said pressure differential.
Claim 5
Dependent Claim
90 words
In the combination according to claim 3, means for preventing fluid flow in said second conduit means from said crankcase to said supply conduit until the pressure in said crankcase exceeds the pressure in said conduit upstream of said throttle means by a predetermined minimum differential comprising check valve means in said second conduit means for enabling comparatively unrestricted fluid flow therein from said supply conduit into said crankcase and for effecting a predetermined restriction to fluid flow in said second conduit means from said crankcase to said supply conduit.
Claim 6
Dependent Claim
158 words
In the combination according to claim 1, said means for effecting said mixture comprising means for supplying fuel to said supply conduit at a fuel inlet upstream of said throttle means and an air inlet in communication with the atmosphere and opening into said supply conduit for supplying air thereto upstream of said fuel inlet, choke valve means in said supply conduit upstream of said fuel inlet for controlling the fluid pressure at said fuel inlet, and means for preventing fluid flow in said second conduit means from said crankcase until the pressure in the latter is greater than the pressure in said supply conduit at said fuel inlet by a predetermined minimum differential comprising check valve means in said second conduit means for enabling comparatively unrestricted fluid flow therein from said supply conduit into said crankcase and for effecting a predetermined restriction to fluid flow in said second conduit means from said crankcase to said supply conduit.
Claim 7
Dependent Claim
46 words
In the combination according to claim 5, flow control valve means responsive to the differential between the pressure in said supply conduit downstream of said throttle means and the pressure in said crankcase for restricting said first conduit means as a function of said pressure differential.
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) | 1981-07-24 | 1982-01-23 | 1982-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-24 | 1986-01-23 | 1986-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-24 | 1990-01-23 | 1990-07-25 | $7700.00 | Window Closed / Lapsed |