US5365898A
Expired / Lapsed
US
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Device for changing a rotational position of a control shaft that controls gas exchange valves of an internal combustion engine
Assignee: Robert Bosch GmbH
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Filing: 1994-02-25
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Granted: 1994-11-22
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Expires: 2014-02-25
Abstract
Abstract A device for changing the rotational position of a rotating, driven control shaft that controls the opening and closing of gas exchange valves of an internal combustion engine and is displaced via an electric motor and an interposed toggle lever arrangement having a downstream diagonal toothing arrangement for simplified displacement with minimal force and energy expenditures. The result is a simple, accessible, easy to maintain economical displacement drive for changing the rotational position of the control shaft in order to change the control times of gas-exchange valves in an internal combustion engine.
Inventors
- 👤 Martin Mueller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:59
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/34; F01L1/344; F01L1/34403; F01L1/34406; Y; Y10; Y10T; Y10T74/00; Y10T74/21; Y10T74/2101; Y10T74/2102
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
172 words
A device for changing a rotational position of a rotatable driven control shaft (1) that controls an opening and closing of gas exchange valves of an internal combustion engine with respect to a rotational position of a drive shaft that drives this control shaft, having a driving part (9) that is driven synchronously with the drive shaft and has a diagonal toothing, the driving part engages with diagonal teeth of a rotating power take-off part (18) driven synchronously with the control shaft (1), which driving part and power take-off part are adjustable relative to one another by means of a connecting part (29, 30) fixed in an axial direction to one of the parts to rotate around the axis of the one part and operated by means of an electric motor (42) controlled as a function of operating parameters, the electric motor (42) drives a threaded spindle (41) on which a screw socket (40, 140) is disposed in a manner fixed against twisting and is coupled with the connecting part (29, 30).
Claim 2
Independent Claim
172 words
A device for changing a rotational position of a rotatable driven control shaft (1) that controls an opening and closing of gas exchange valves of an internal combustion engine with respect to a rotational position of a drive shaft that drives this control shaft, having a driving part (9) that is driven synchronously with the drive shaft and has a diagonal toothing, the driving part engages with diagonal teeth of a rotating power take-off part (18) driven synchronously with the control shaft (1), which driving part and power take-off part are adjustable relative to one another by means of a connecting part (29, 30) fixed in an axial direction to one of the parts to rotate around the axis of the one part and operated by means of an electric motor (42) controlled as a function of operating parameters, the electric motor (42) drives a threaded spindle (41) on which a screw socket (40, 140) is disposed in a manner fixed against twisting and is coupled with the connecting part (29, 30).
Claim 3
Dependent Claim
54 words
A device as defined in claim 1, in which a transmission lever (35) is disposed between the screw socket (40, 140) and connecting part (29, 30) and whose pivot axis (38) is supported against a stationary part (39), and that is connected in an articulated manner to the connecting part and the screw socket.
Claim 4
Dependent Claim
19 words
A device as defined in claim 2, in which the transmission lever (35) is embodied to have two arms.
Claim 5
Dependent Claim
78 words
A device as defined in claim 3, in which the transmission lever (35) has its pivot axis (38) between its end points, via which axis the transmission lever is coupled with a pivotable support lever (37) in a plane parallel to its pivot plane, the support lever being seated at its end in a stationary bearing (39), wherein the connecting part (29, 30) and the screw socket (40, 140) are hingedly securely coupled with the transmission lever (35).
Claim 6
Dependent Claim
49 words
A device as defined in claim 4, in which the stationary seating (39) of the support lever (37) lies essentially in an axis that is perpendicular to the spindle axis and perpendicular to the control shaft axis, and through which the point of intersection of these two axes passes.
Claim 7
Dependent Claim
35 words
A device as defined in claim 5, in which two one-armed support levers (37) and transmission levers (35) are provided that are disposed parallel to one another and on both sides of the threaded spindle.
Claim 8
Dependent Claim
24 words
A device as defined in claim 2, in which the threaded spindle (41) is disposed at a right angle to the control shaft (1).
Claim 9
Dependent Claim
24 words
A device as defined in claim 3, in which the threaded spindle (41) is disposed at a right angle to the control shaft (1).
Claim 10
Dependent Claim
24 words
A device as defined in claim 4, in which the threaded spindle (41) is disposed at a right angle to the control shaft (1).
Claim 11
Dependent Claim
24 words
A device as defined in claim 5, in which the threaded spindle (41) is disposed at a right angle to the control shaft (1).
Claim 12
Dependent Claim
24 words
A device as defined in claim 6, in which the threaded spindle (41) is disposed at a right angle to the control shaft (1).
Claim 13
Dependent Claim
147 words
A device as defined in claim 1, in which the power take-off part (18) has a trunnion (20) that has a spline shaft outer toothing (21) and displaceably engages an inside spline shaft toothing (22) of an axial bore in the control shaft (1), and that the take-off part (18) has a pot-shaped part (24) connected to the trunnion (20), at an outer circumference of said take-off part, an outer diagonal toothing (17) is provided that engages an inner diagonal toothing (16) of a driving toothed wheel (9) that forms the power take-off part and is guided to twist on the control shaft (1), said power take-off part is coupled securely with the inner diagonal toothing in the axial direction, and at its circumference has driving means (11) for a connection secure against relative rotation to a transmission means for the rotational movement of the drive shaft.
Claim 14
Dependent Claim
99 words
A device as defined in claim 12, in which a plate (29) is inserted on the front face into the interior of the pot-shaped part (24) as a connecting part, between said part and the pot bottom, on one side, and between the connecting part and a holding ring (31) attached to the pot-shaped part (24) on the other, a rolling bearing (28, 33) is respectively provided, wherein the plate has a connecting trunnion (30) that protrudes outwardly through the holding ring (31), at the end of said trunnion the end of the transmission lever (35) is pivotably secured.
Claim 15
Dependent Claim
45 words
A device as defined in claim 1, in which a plurality of control shafts (1, 101) are provided parallel to one another on the internal combustion engine, and a plurality of transmission levers associated with each control shaft is operated via the screw socket (40).
Claim 16
Dependent Claim
61 words
A device as defined in claim 2, in which plurality of parallel control shafts (1, 101) are disposed on the internal combustion engine, and a plurality of screw sockets (40, 140) corresponding to the number of control shafts and associated therewith are disposed on the threaded spindle (41),and are each connected to a transmission lever respectively associated with a control shaft.
Claim 17
Dependent Claim
62 words
A device as defined in claim 4, in which plurality of parallel control shafts (1, 101) are disposed on the internal combustion engine, and a plurality of screw sockets (40, 140) corresponding to the number of control shafts and associated therewith are disposed on the threaded spindle (41), and are each connected to a transmission lever respectively associated with a control shaft.
Claim 18
Dependent Claim
63 words
A device as defined in claim 7, in which a plurality of parallel control shafts (1, 101) are disposed on the internal combustion engine, and a plurality of screw sockets (40, 140) corresponding to the number of control shafts and associated therewith are disposed on the threaded spindle (41), and are each connected to a transmission lever respectively associated with a control shaft.
Claim 19
Dependent Claim
23 words
A device as defined in claim 13, in which the guide bearing (50) is provided at an end of the threaded spindle (41).
Claim 20
Dependent Claim
25 words
A device as defined in claim 14, in which the guide bearing is formed by a second electric motor (142) coupled with the threaded spindle.
Claim 21
Dependent Claim
49 words
A device as defined in claim 1, in which the shaft of the electric motor (42, 142) is connected to the end of a flat spiral spring (46) stationarily secured at its other end and prestressed in the direction of an end position of the screw socket (40, 140).
References Cited (Backward Citations)
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US4498431A
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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) | 1997-11-21 | 1998-05-23 | 1998-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-11-21 | 2002-05-23 | 2002-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-11-21 | 2006-05-23 | 2006-11-22 | $7700.00 | Window Closed / Lapsed |