US3894713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas control valve for use with an internal combustion engine
Assignee: Denso Corp
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Filing: 1973-09-25
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Granted: 1975-07-15
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Expires: 1993-09-25
Abstract
Abstract In an exhaust gas control valve for use with an internal combustion engine of the type in which a shaft having a valve disk fixed to one end thereof has its the other end securely fixed to a control diaphragm so that the displacement of the shaft and hence the opening and closing of the valve may be controlled in response to the operating condition of the internal combustion engine, the extension of the shaft beyond the valve disk is supported by a round bore of a spline-fitting-like valve seat body having a plurality of spline-like slots and fitted into one port of the control valve, the inner end of the valve seat body serving as a valve seat, whereby a bearing bush of the conventional exhaust gas control valve which supports the shaft at the midpoint portion thereof may be eliminated.
Inventors
- 👤 Mikiji Ito
- 👤 Motohisa Miura
- 👤 Toshiyuki Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:41
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/36; F16K31/365; F02; F02M; F02M26/00; F02M26/52; F02M26/55; F02M26/58; F02M26/65; F02M26/66; F02M26/68; F02M26/74; F02M26/50
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
203 words
In an exhaust gas control valve for use with an internal combustion engine, said control valve comprising a valve casing having first and second ports, a valve disk for opening and closing said first port, said valve disk being fixed to a shaft extending into said casing through an open end of said casing axially opposite to said first port, sealing means provided between said shaft and said casing for air-tightly sealing said open end, and a control diaphragm disposed out of said casing and fixed to said shaft for controlling the opening and closing of said first port by said valve disk in response to the operating condition of the internal combustion engine, an improvement comprising a spline-fitting-like valve seat body fixed to said first porT, said valve seat body having a round bore extending coaxially with said shaft and a plurality of spline-like slots radiating from said bore, the free end of said shaft extended beyond said valve disk fixed thereto being slidably fitted into said bore, and the inner end of said valve seat body forming a valve seat for said valve disk and said slots being the substantially exclusive means for passing exhaust gas through said valve seat body.
Claim 2
Dependent Claim
203 words
In an exhaust gas control valve for use with an internal combustion engine, said control valve comprising a valve casing having first and second ports, a valve disk for opening and closing said first port, said valve disk being fixed to a shaft extending into said casing through an open end of said casing axially opposite to said first port, sealing means provided between said shaft and said casing for air-tightly sealing said open end, and a control diaphragm disposed out of said casing and fixed to said shaft for controlling the opening and closing of said first port by said valve disk in response to the operating condition of the internal combustion engine, an improvement comprising a spline-fitting-like valve seat body fixed to said first porT, said valve seat body having a round bore extending coaxially with said shaft and a plurality of spline-like slots radiating from said bore, the free end of said shaft extended beyond said valve disk fixed thereto being slidably fitted into said bore, and the inner end of said valve seat body forming a valve seat for said valve disk and said slots being the substantially exclusive means for passing exhaust gas through said valve seat body.
Claim 3
Dependent Claim
36 words
An exhaust gas control valve as defined in claim 1 wherein said sealing means comprises a diaphragm whose outer periphery is air-tightly fixed to said valve casing and whose center is air-tightly fixed to said shaft.
Claim 4
Dependent Claim
36 words
An exhaust gas control valve as defined in claim 2 wherein said first port is communicated with one of intake and exhaust pipes of the internal combustion engine and said second port, with the other pipe.
Claim 5
Dependent Claim
144 words
An exhaust gas control valve as defined in claim 1 wherein said sealing means comprises a stationary member comprising a hollow cylindrical portion into which said shaft is movably fitted with a suitable clearance and a radially outwardly extended flange portion formed integral with the rear end of said hollow cylindrical portion, the outer periphery of said flange portion being air-tightly secured to said valve casing; and a cup-shaped movable member comprising a disk-shaped bottom portion securely fixed to said shaft and serving as a valve disk for said first port and a hollow cylindrical portion coaxially fitted over said hollow cylindrical portion of the stationary member with a suitable clearance and having such an axial length that the cylindrical portions of said stationary and movable members remain overlapping each other even when said disk-shaped bottom portion is in contact with said valve seat.
Claim 6
Dependent Claim
31 words
An exhaust gas control valve as defined in claim 4 wherein said cup-shaped movable member has a flange portion radially outwardly flared from the open end of said cylindrical portion thereof.
Claim 7
Dependent Claim
33 words
An exhaust gas control valve as defined in claim 4 wherein said first port is communicated with an exhaust pipe of the internal combustion engine and said second port, with an intake pipe.
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) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |