Patent US3796408A successfully refreshed from Google Patents.
US3796408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust control valve
Assignee: Maremont Corp
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Filing: 1973-01-15
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Granted: 1974-03-12
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Expires: 1993-01-15
Abstract
Abstract An exhaust control valve system for controlling the flow of engine exhaust gases and arranged to inhibit heat transfer from the exhaust to linkage portions of the system to permit lower cost and more effective friction reducing features, and in which a mechanism is provided to prevent rattling at either limit position of the valve and to insure accurate operation.
Inventors
- 👤 W Sheppard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:00
CPC Classifications
F; F02; F02M; F02M31/00; F02M31/02; F02M31/04; F02M31/06; F02M31/08; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
187 words
In an exhaust control valve for association with the exhaust system of an internal combustion engine for selectively controlling the exhaust flow, the combination of a body portion having a port in an exhaust discharge path of the engine, a valve plate movable between a first position in which said port is essentially open and a second position in which said port is essentially closed and exposed to the temperature of the exhaust gases in the discharge path, shaft means secured to said plate, means for supporting said shaft means for rotation about a first axis, an actuator having a selectively movable portion, crank means having one portion connected in rotational driving relation with said shaft means, bearing means spaced from said shaft means and engaging said crank means at a portion thereof spaced from said one portion and pivotally supporting said crank for rotation about an axis essentially co-axial with said first axis, and link means connected to said crank means at a portion thereof spaced from said first axis and drivingly connecting said actuator portion to said crank means for selectively rotating said crank means.
Claim 2
Dependent Claim
187 words
In an exhaust control valve for association with the exhaust system of an internal combustion engine for selectively controlling the exhaust flow, the combination of a body portion having a port in an exhaust discharge path of the engine, a valve plate movable between a first position in which said port is essentially open and a second position in which said port is essentially closed and exposed to the temperature of the exhaust gases in the discharge path, shaft means secured to said plate, means for supporting said shaft means for rotation about a first axis, an actuator having a selectively movable portion, crank means having one portion connected in rotational driving relation with said shaft means, bearing means spaced from said shaft means and engaging said crank means at a portion thereof spaced from said one portion and pivotally supporting said crank for rotation about an axis essentially co-axial with said first axis, and link means connected to said crank means at a portion thereof spaced from said first axis and drivingly connecting said actuator portion to said crank means for selectively rotating said crank means.
Claim 3
Dependent Claim
56 words
The combination of claim 1 in which said actuator portion moves essentially in translation, in which said link means is connected to said crank means with a pivot connection, and in which the plane in which forces are applied by said link means to said pivot connection is spaced from the plane of said bearing means.
Claim 4
Dependent Claim
116 words
The combination of claim 1 in which said portion of said actuator means is capable of moving with limited force between a first limit position and a second limit position, and further including stop means for stopping rotational motion of said shaft means at one position in which said valve plate is essentially at said first position and in which said one portion of said actuator is proximate but spaced from said first limit position, and for stopping rotational motion of said first means at another position in which said valve plate is essentially at said second position and in which said one portion of said actuator is proximate but spaced from said second limit position.
Claim 5
Dependent Claim
93 words
The combination of claim 3 in which said actuator portion moves essentially in translation, in which said link means is connected to said crank means with a pivot connection, and in which the plane in which forces are applied by said link means to said pivot connection is spaced from the plane of said bearing means for creating a force tending to cock said crank means relative to said bearing means during continuing application of force by said actuator portion while rotational motion of said shaft means is stopped by said stop means.
Claim 6
Dependent Claim
55 words
The combination of claim 3 in which said limited-force actuator is a pneumatic servo including a spring and in which a force is exerted in one direction on said one portion thereof in response to a pneumatic pressure differential and a force is exerted in the opposite direction on said one portion by said spring.
Claim 7
Dependent Claim
42 words
The combination of claim 1 in which said bearing means includes a low-friction bearing material which is adversely affected by excessive temperatures, and further including heat-transfer reducing means for reducing the transfer of heat from said valve plate to said bearing means.
Claim 8
Dependent Claim
24 words
The combination of claim 6 in which said heat transfer reducing means comprises a loose connection between said shaft means and said crank means.
Claim 9
Dependent Claim
35 words
The combination of claim 7 in which said loose connection comprises a non-circular end portion on said shaft means and a correspondingly shaped aperture in said crank means larger in size than said end portion.
Claim 10
Dependent Claim
22 words
The combination of claim 6 in which said heat transfer reducing means comprises an elongated and thin portion of said crank means.
Claim 11
Dependent Claim
58 words
The combination of claim 1 in which said actuator portion moves essentially in translation, in which said link means is connected to said crank means with a pivot connection, and in which the plane in which forces are applied by said link means to said pivot connection is substantially the same as the plane of said bearing means.
Claim 12
Dependent Claim
81 words
The combination of claim 1 in which said actuator portion moves essentially in translation, in which said link means is connected to said crank means with a pivot connection, and in which the plane in which forces are applied by said link means to said pivot connection is spaced from the plane of said bearing means by a distance which is small relative to the distance between the plane of said bearing means and said one portion of said crank means.
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) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |