Patent US5377638A successfully refreshed from Google Patents.
US5377638A
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Hydraulic adjusting device
Assignee: Robert Bosch GmbH
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Filing: 1993-10-01
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Granted: 1995-01-03
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Expires: 2013-10-01
Abstract
Abstract A hydraulic adjusting device for rotating a camshaft relative to its drive wheel which includes a coupling member, which cooperates with the drive wheel and with the camshaft via a pair of gear tooth systems, at least one of which is a helical gear. The coupling member is connected to an actuator, which is embodied as a single-acting cylinder. This singleacting cylinder is acted upon by pressure that is variable by a control valve. The restoration of the coupling member or of the actuator takes place only from the restoring moment upon the actuation of the valves of the engine by the camshaft.
Inventors
- 👤 Martin Mueller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:24
CPC Classifications
B; B21; B21D; B21D53/00; F; F15; F15B; F15B11/00; F15B11/08; F01; F01L; F01L1/00; F01L1/34; F01L1/344; F01L1/34403; F01L1/34406; F15B9/00; F15B9/02; F15B9/08; F01L1/3442; F01L2001/34423; F01L2001/34426; F01L2001/3443
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
135 words
A hydraulic adjusting device for rotating a camshaft (10) of an internal combustion engine relative to a drive wheel (11) of the engine with an actuator (39), which is acted upon by a pressure of a pump (43, 47, 48, 49), which pressure is variable via a control valve (90), and is connected to a longitudinally displaceable coupling member (23) that via a respective pair of gear tooth systems (26, 27) cooperates with the drive wheel (11) and with the camshaft (10), wherein at least one pair of gear tooth systems (26, 27) is embodied as a helical gear, an actuator (39) is embodied as a single-acting cylinder, whose pressure chamber (42, 59) always communicates with the pump, and total pitch of the pairs of gear tooth systems is less than 200 mm per revolution.
Claim 2
Dependent Claim
135 words
A hydraulic adjusting device for rotating a camshaft (10) of an internal combustion engine relative to a drive wheel (11) of the engine with an actuator (39), which is acted upon by a pressure of a pump (43, 47, 48, 49), which pressure is variable via a control valve (90), and is connected to a longitudinally displaceable coupling member (23) that via a respective pair of gear tooth systems (26, 27) cooperates with the drive wheel (11) and with the camshaft (10), wherein at least one pair of gear tooth systems (26, 27) is embodied as a helical gear, an actuator (39) is embodied as a single-acting cylinder, whose pressure chamber (42, 59) always communicates with the pump, and total pitch of the pairs of gear tooth systems is less than 200 mm per revolution.
Claim 3
Dependent Claim
25 words
A hydraulic adjusting device as defined by claim 1, in which the total pitch of the pairs of gear tooth systems ≧110 mm per revolution.
Claim 4
Dependent Claim
31 words
A hydraulic adjusting device as defined by claim 1, in which the pressure chamber (42, 59) of the cylinder is embodied in a control tang (43) of the pump (43, 47-49).
Claim 5
Dependent Claim
31 words
A hydraulic adjusting device as defined by claim 2, in which the pressure chamber (42, 59) of the cylinder is embodied in a control tang (43) of the pump (43, 47-49).
Claim 6
Dependent Claim
22 words
A hydraulic adjusting device as defined by claim 1, in which the control valve (90) is disposed coaxially with the camshaft (10).
Claim 7
Dependent Claim
22 words
A hydraulic adjusting device as defined by claim 2, in which the control valve (90) is disposed coaxially with the camshaft (10).
Claim 8
Dependent Claim
22 words
A hydraulic adjusting device as defined by claim 3, in which the control valve (90) is disposed coaxially with the camshaft (10).
Claim 9
Dependent Claim
25 words
A hydraulic adjusting device as defined by claim 1, in which one pair of gear tooth systems (26, 27) is embodied as a spur gear.
Claim 10
Dependent Claim
25 words
A hydraulic adjusting device as defined by claim 2, in which one pair of gear tooth systems (26, 27) is embodied as a spur gear.
Claim 11
Dependent Claim
25 words
A hydraulic adjusting device as defined by claim 3, in which one pair of gear tooth systems (26, 27) is embodied as a spur gear.
Claim 12
Dependent Claim
25 words
A hydraulic adjusting device as defined by claim 5, in which one pair of gear tooth systems (26, 27) is embodied as a spur gear.
Claim 13
Dependent Claim
24 words
A hydraulic adjusting device as defined by claim 1, in which both pairs of gear tooth systems (26, 27) are embodied as helical gears.
Claim 14
Dependent Claim
24 words
A hydraulic adjusting device as defined by claim 2, in which both pairs of gear tooth systems (26, 27) are embodied as helical gears.
Claim 15
Dependent Claim
24 words
A hydraulic adjusting device as defined by claim 3, in which both pairs of gear tooth systems (26, 27) are embodied as helical gears.
Claim 16
Dependent Claim
24 words
A hydraulic adjusting device as defined by claim 5, in which both pairs of gear tooth systems (26, 27) are embodied as helical gears.
Claim 17
Dependent Claim
27 words
A hydraulic adjusting device as defined by claim 1, in which the pump (43, 47, 48, 49) is supported on an outside of a housing wall (45).
Claim 18
Dependent Claim
27 words
A hydraulic adjusting device as defined by claim 2, in which the pump (43, 47, 48, 49) is supported on an outside of a housing wall (45).
Claim 19
Dependent Claim
27 words
A hydraulic adjusting device as defined by claim 3, in which the pump (43, 47, 48, 49) is supported on an outside of a housing wall (45).
Claim 20
Dependent Claim
29 words
A hydraulic adjusting device as defined by claim 1, in which the pump (43, 47, 48, 49) is controlled by an inlet slit (81) and an outlet slit (82).
Claim 21
Dependent Claim
29 words
A hydraulic adjusting device as defined by claim 2, in which the pump (43, 47, 48, 49) is controlled by an inlet slit (81) and an outlet slit (82).
Claim 22
Dependent Claim
29 words
A hydraulic adjusting device as defined by claim 3, in which the pump (43, 47, 48, 49) is controlled by an inlet slit (81) and an outlet slit (82).
Claim 23
Dependent Claim
26 words
A hydraulic adjusting device as defined by claim 1, in which the pump (43, 47-49) is throttled on an intake side by an intake throttle (61).
Claim 24
Dependent Claim
26 words
A hydraulic adjusting device as defined by claim 2, in which the pump (43, 47-49) is throttled on an intake side by an intake throttle (61).
Claim 25
Dependent Claim
26 words
A hydraulic adjusting device as defined by claim 3, in which the pump (43, 47-49) is throttled on an intake side by an intake throttle (61).
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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) | 1998-01-02 | 1998-07-04 | 1999-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-02 | 2002-07-04 | 2003-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-02 | 2006-07-04 | 2007-01-03 | $7700.00 | Window Closed / Lapsed |