US4886022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine valve driving apparatus
Assignee: Mazda Motor Corp
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Filing: 1989-01-03
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Granted: 1989-12-12
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Expires: 2009-01-03
Abstract
Abstract Engine valve driving apparatus having a camshaft and a radially movable cam supported on the camshaft. A support is fixed to the camshaft. Both the movable cam and the fixed support are formed with holes, whose axes coincide with each other when the movable cam protrudes at its maximum outward position. A connecting pin is disposed in the hole of the fixed support and an oil supply actuates the connecting pin. When the connecting pin is forced by the oil supply, the connecting pin lifts the movable cam radially outwardly to its maximum outward position.
Inventors
- 👤 Eiji Nakai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:33
CPC Classifications
F; F01; F01L; F01L13/00; F01L13/0015; F01L13/0036; F01L1/00; F01L1/02; F01L1/04; F01L1/047; F01L1/053; F01L1/0532; Y; Y10; Y10T; Y10T74/00; Y10T74/21; Y10T74/2101; Y10T74/2102
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
124 words
An engine valve driving apparatus for internal combustion engine comprising, a camshaft rotatable in synchronism with rotation of an engine crankshaft, a first cam member fixed on said camshaft, a second cam member supported by said camshaft for radial movement between a projected and a retracted position; both cam members defining holes whose axes coincide with each other when the second cam member is held at its projected position, a connecting pin disposed in one of said holes for moving the second cam member radially outwardly by shifting from the hole in which it is disposed toward the other holes, and oil supply means for supplying oil to shift said connecting pin to move the second cam member radially outwardly to its projected position.
Claim 2
Dependent Claim
124 words
An engine valve driving apparatus for internal combustion engine comprising, a camshaft rotatable in synchronism with rotation of an engine crankshaft, a first cam member fixed on said camshaft, a second cam member supported by said camshaft for radial movement between a projected and a retracted position; both cam members defining holes whose axes coincide with each other when the second cam member is held at its projected position, a connecting pin disposed in one of said holes for moving the second cam member radially outwardly by shifting from the hole in which it is disposed toward the other holes, and oil supply means for supplying oil to shift said connecting pin to move the second cam member radially outwardly to its projected position.
Claim 3
Dependent Claim
24 words
An engine valve driving apparatus in accordance with claim 1, wherein said holes decline at a predetermined angle to the axis of said camshaft.
Claim 4
Dependent Claim
23 words
An engine valve driving apparatus in accordance with claim 1, wherein said connecting pin fixes said movable cam member at its projected position.
Claim 5
Dependent Claim
33 words
An engine valve driving apparatus in accordance with claim 1, wherein the other hole has a tapered portion for co-acting with said connecting pin when the second cam member is moved radially outwardly.
Claim 6
Dependent Claim
26 words
An engine valve driving apparatus in accordance with claim 4, wherein said connecting pin has a end of semi-spherical configuration to coact with said tapered portion.
Claim 7
Dependent Claim
52 words
An engine valve driving apparatus in accordance with claim 1, wherein said oil supply means includes an oil supply passage to supply oil to the connecting pin from an oil room having an accumulator, and another oil passage to supply oil from the oil room to a cam journal of the camshaft.
Claim 8
Dependent Claim
19 words
An engine valve driving apparatus in accordance with claim 6, wherein said another oil passage has a restriction therein.
Claim 9
Dependent Claim
23 words
An engine valve driving apparatus in accordance with claim 1, wherein said cam members are mounted on the camshaft adjacent to one another.
Claim 10
Dependent Claim
34 words
An engine valve driving apparatus in accordance with claim 8, wherein said second cam member has a profile such that it protrudes radially outward beyond the first cam member when in its projected position.
Claim 11
Dependent Claim
27 words
An engine valve driving apparatus in accordance with claim 1 further comprising auxiliary actuating means for lifting said second cam member responsive to oil pressure applied thereto.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-12-11 | 1993-06-12 | 1993-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-11 | 1997-06-12 | 1997-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-11 | 2001-06-12 | 2001-12-12 | $7700.00 | Window Closed / Lapsed |