Patent EP0032282A1 successfully refreshed from Google Patents.
US5263442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve timing control apparatus
Assignee: Hitachi Ltd
•
Filing: 1992-07-28
•
Granted: 1993-11-23
•
Expires: 2012-07-28
Abstract
Abstract A valve timing control apparatus including a rotary member drivingly connected to an engine crankshaft for rotation with the engine crankshaft, and a drive mechanism for transmitting rotation of the rotary member to a camshaft. The drive mechanism includes a piston member provided for reciprocation between first and second positions within the rotary member to rotate the camshaft with respect to the rotary member. The piston member defines first and second pressure chambers on the opposite sides thereof along with the rotary member. A valve member is provided for movement between third and fourth positions. The valve member is adapted to connect the first pressure chamber to a pressure source while connecting the second pressure chamber to a drain port to produce a pressure differential between the first and second pressure chambers to move the piston member toward the second position when the valve member moves from the third position to the fourth position. The valve member is adapted to connect the first pressure chamber to the drain port while connecting the second pressure chamber to the pressure source to produce a pressure differential between the first and second chambers so as to move the piston member toward the first position when the valve member moves from the fourth position to the third position. The valve member is moved according to engine operating conditions.
Inventors
- 👤 Seinosuke Hara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:19
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/34; F01L1/344; F02; F02B; F02B2275/00; F02B2275/18; Y; Y10; Y10T; Y10T74/00; Y10T74/21; Y10T74/2101; Y10T74/2102
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
371 words
A valve timing control apparatus for use in an internal combustion engine having a crankshaft driven by the engine and a camshaft adapted to drive at least one valve, the valve timing control apparatus comprising; a rotary valve member drivingly connected to the crankshaft for rotation with the crankshaft; a drive mechanism for transmitting rotation of the rotary member to the camshaft, the drive mechanism including a piston member provided for reciprocation between first and second positions within the rotary member to rotate the camshaft with respect to the rotary member, the piston member having means for rotating the camshaft at a maximum angle with respect to the rotary member in a first direction when the piston member is at the first position and at a maximum angle with respect to the rotary member in a second direction opposite to the first direction when the piston member is at the second position, the piston member defining first and second pressure chambers on the opposite sides thereof along with the rotary member; a valve member movable between third and fourth positions, the valve member including means for connecting the first pressure chamber to a pressure source while connecting the second pressure chamber to a drain port to produce a pressure differential between the first and second pressure chambers to move the piston member toward the second position when the valve member moves from the third position to the fourth position, the valve member including means for connecting the first pressure chamber to the drain port while connecting the second pressure chamber to the pressure source to produce a pressure differential between the first and second chambers so as to move the piston member toward the first position when the valve member moves from the fourth position to the third position, the valve member including means for closing the first and second pressure chambers to retain the piston member at the first position when the piston member is at the first position, and means for closing the first and second pressure chambers to retain the piston member at the second position when the piston member is at the second position; and control means for moving the valve member according to engine operating conditions.
Claim 2
Dependent Claim
371 words
A valve timing control apparatus for use in an internal combustion engine having a crankshaft driven by the engine and a camshaft adapted to drive at least one valve, the valve timing control apparatus comprising; a rotary valve member drivingly connected to the crankshaft for rotation with the crankshaft; a drive mechanism for transmitting rotation of the rotary member to the camshaft, the drive mechanism including a piston member provided for reciprocation between first and second positions within the rotary member to rotate the camshaft with respect to the rotary member, the piston member having means for rotating the camshaft at a maximum angle with respect to the rotary member in a first direction when the piston member is at the first position and at a maximum angle with respect to the rotary member in a second direction opposite to the first direction when the piston member is at the second position, the piston member defining first and second pressure chambers on the opposite sides thereof along with the rotary member; a valve member movable between third and fourth positions, the valve member including means for connecting the first pressure chamber to a pressure source while connecting the second pressure chamber to a drain port to produce a pressure differential between the first and second pressure chambers to move the piston member toward the second position when the valve member moves from the third position to the fourth position, the valve member including means for connecting the first pressure chamber to the drain port while connecting the second pressure chamber to the pressure source to produce a pressure differential between the first and second chambers so as to move the piston member toward the first position when the valve member moves from the fourth position to the third position, the valve member including means for closing the first and second pressure chambers to retain the piston member at the first position when the piston member is at the first position, and means for closing the first and second pressure chambers to retain the piston member at the second position when the piston member is at the second position; and control means for moving the valve member according to engine operating conditions.
Claim 3
Dependent Claim
32 words
The valve timing control apparatus as claimed in claim 1, wherein the control means includes means for moving the valve member at a distance calculated as a function of engine operating conditions.
References Cited (Backward Citations)
US4231330A
Cited
US4856465A
Cited
US4787345A
Cited
US4862843A
Cited
US4858572A
Cited
US4895113A
Cited
US5111780A
Cited
US4903650A
Cited
US5088456A
Cited
US5138985A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-11-22 | 1997-05-24 | 1997-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-22 | 2001-05-24 | 2001-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-22 | 2005-05-24 | 2005-11-23 | $7700.00 | Window Closed / Lapsed |