US5170756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for changing the relative rotating position of shafts in an internal-combustion engine
Assignee: Dr Ing HCF Porsche AG
•
Filing: 1991-07-25
•
Granted: 1992-12-15
•
Expires: 2011-07-25
Abstract
Abstract An arrangement for changing the relative rotating position of shafts in an internal-combustion engine has a camshaft, which can be rotated with respect to a shaft driving it, that has a phase converter with a piston which is acted upon hydraulically on both sides. The sprocket wheel driving the camshaft has an external toothing. A toothing, which is connected with the camshaft via a hollow shaft, is constructed as an internal toothing. Corresponding toothings of the piston engage in both toothings. In the camshaft, an axial recess is arranged in which an inserted pipe separates two spaces from one another. An on/off valve fed from the oil circulating system, in one position, via one of the spaces, supplies the piston with oil pressure so that it is axially shifted into a first end position and, in the process, turns the camshaft. In a second position, the piston is axially pushed back by the second space with oil pressure.
Inventors
- 👤 Imre Szodfridt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:40
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/34; F01L1/344; F01L1/34403; F01L1/34406; F01M; F01M9/00; F01M9/10; F01M9/102; F01L1/02; F01L1/04; F01L1/047; F01L2001/0475; F01L2001/0476; F01L1/053; F01L2001/0537; F01L1/3442; F01L2001/34423; F01L2001/34426; F01L2001/34486; F01L2001/34496; F02; F02B; F02B2275/00; F02B2275/18
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
203 words
An arrangement for automatically controlled changing of a relative rotating position of two shafts in an internal-combustion engine, comprising: at least one camshaft which can be rotated as a function of parameters of the internal-combustion engine relative to a shaft driving the camshaft and having a second internal toothing; an oil circulating system; a coupling member having a first internal toothing and a second external toothing and which is coupled to the oil circulating system so as to be axially shiftable between at least two end positions; a wheel which drives the camshaft and having a first external toothing and which, via the coupling member, acts upon the second internal toothing of the camshaft, wherein the first external toothing of the wheel interacts with the first internal toothing of the coupling member, and the second internal toothing of the camshaft interacts with the second external toothing of the coupling member; further comprising a hollow shaft which is detachably connected with the camshaft, said second toothing being received within the hollow shaft; further comprising screwed connections, and wherein the hollow shaft has oblong holes and in a non-rotatable manner is fastened to the camshaft via penetration of the screwed connections into the oblong holes.
Claim 2
Dependent Claim
203 words
An arrangement for automatically controlled changing of a relative rotating position of two shafts in an internal-combustion engine, comprising: at least one camshaft which can be rotated as a function of parameters of the internal-combustion engine relative to a shaft driving the camshaft and having a second internal toothing; an oil circulating system; a coupling member having a first internal toothing and a second external toothing and which is coupled to the oil circulating system so as to be axially shiftable between at least two end positions; a wheel which drives the camshaft and having a first external toothing and which, via the coupling member, acts upon the second internal toothing of the camshaft, wherein the first external toothing of the wheel interacts with the first internal toothing of the coupling member, and the second internal toothing of the camshaft interacts with the second external toothing of the coupling member; further comprising a hollow shaft which is detachably connected with the camshaft, said second toothing being received within the hollow shaft; further comprising screwed connections, and wherein the hollow shaft has oblong holes and in a non-rotatable manner is fastened to the camshaft via penetration of the screwed connections into the oblong holes.
Claim 3
Dependent Claim
197 words
An arrangement for automatically controlled changing of a relative rotating position of two shafts in an internal-combustion engine, comprising: at least one camshaft which can be rotated as a function of parameters of the internal-combustion engine relative to a shaft driving the camshaft and having a second internal toothing; an oil circulating system; a coupling member having a first internal toothing and a second external toothing and which is coupled to the oil circulating system so as to be axially shiftable between at least two end positions; a wheel which drives the camshaft and having a first external toothing and which, via the coupling member, acts upon the second internal toothing of the camshaft, wherein the first external toothing of the wheel interacts with the first internal toothing of the coupling member, and the second internal toothing of the camshaft interacts with the second external toothing of the coupling member; further comprising a hollow shaft which is detachably connected with the camshaft, said second toothing being received within the hollow shaft; wherein the wheel is axially held on the hollow shaft; further comprising a radially prestressed spring ring that axially holds the wheel on the hollow shaft.
Claim 4
Dependent Claim
197 words
An arrangement for automatically controlled changing of a relative rotating position of two shafts in an internal-combustion engine, comprising: at least one camshaft which can be rotated as a function of parameters of the internal-combustion engine relative to a shaft driving the camshaft and having a second internal toothing; an oil circulating system; a coupling member having a first internal toothing and a second external toothing and which is coupled to the oil circulating system so as to be axially shiftable between at least two end positions; a wheel which drives the camshaft and having a first external toothing and which, via the coupling member, acts upon the second internal toothing of the camshaft, wherein the first external toothing of the wheel interacts with the first internal toothing of the coupling member, and the second internal toothing of the camshaft interacts with the second external toothing of the coupling member; further comprising a hollow shaft which is detachably connected with the camshaft, said second toothing being received within the hollow shaft; wherein the wheel is axially held on the hollow shaft; further comprising a radially prestressed spring ring that axially holds the wheel on the hollow shaft.
Claim 5
Dependent Claim
53 words
An arrangement according to claim 2, wherein the wheel has a groove and the hollow shaft has a turned groove, and wherein half of the spring ring is arranged in the groove of the wheel and the other half of the spring ring is arranged in the turned groove of the hollow shaft.
Claim 6
Dependent Claim
199 words
An arrangement for automatically controlled changing of a relative rotating position of two shafts in an internal-combustion engine, comprising: at least one camshaft which can be rotated as a function of parameters of the internal-combustion engine relative to a shaft driving the camshaft and having a second internal toothing; an oil circulating system; a coupling member having a first internal toothing and a second external toothing and which is coupled to the oil circulating system as to be axially shiftable between at least two end positions; a wheel which drives the camshaft and having a first external toothing and which, via the coupling member, acts upon the second internal toothing of the camshaft, wherein the first external toothing of the wheel interacts with the first internal toothing of the coupling member, and the second internal toothing of the camshaft interacts with the second external toothing of the coupling member; further comprising a hollow shaft which is detachably connected with the camshaft, said second toothing being received within the hollow shaft; and further comprising a space between the camshaft and the hollow shaft, wherein said coupling member divides the space into two chambers fluidly coupled to the oil circulating system.
Claim 7
Dependent Claim
199 words
An arrangement for automatically controlled changing of a relative rotating position of two shafts in an internal-combustion engine, comprising: at least one camshaft which can be rotated as a function of parameters of the internal-combustion engine relative to a shaft driving the camshaft and having a second internal toothing; an oil circulating system; a coupling member having a first internal toothing and a second external toothing and which is coupled to the oil circulating system as to be axially shiftable between at least two end positions; a wheel which drives the camshaft and having a first external toothing and which, via the coupling member, acts upon the second internal toothing of the camshaft, wherein the first external toothing of the wheel interacts with the first internal toothing of the coupling member, and the second internal toothing of the camshaft interacts with the second external toothing of the coupling member; further comprising a hollow shaft which is detachably connected with the camshaft, said second toothing being received within the hollow shaft; and further comprising a space between the camshaft and the hollow shaft, wherein said coupling member divides the space into two chambers fluidly coupled to the oil circulating system.
Claim 8
Dependent Claim
16 words
An arrangement according to claim 4, wherein the wheel is axially held on the hollow shaft.
Claim 9
Dependent Claim
32 words
An arrangement according to claim 4, wherein the wheel has oblong holes, and the wheel is axially fastened on the hollow shaft by screws that penetrate the oblong holes through guide sleeves.
Claim 10
Dependent Claim
19 words
An arrangement according to claim 6, wherein a slight axial play exists between the guide sleeves and the wheel.
Claim 11
Dependent Claim
88 words
An arrangement according to claim 4, further comprising an axial recess arranged in the end of the camshaft adjacent to the hollow shaft, the recess being connected with the oil circulating system, and having a locking element which controls filling and emptying of the chambers with oil, and a cylindrical body arranged in the recess separates a ring-shaped exterior space which, in a first position of the change-over valve connects the first chamber during filling with a first bore of the camshaft connected to the oil circulating system.
Claim 12
Dependent Claim
26 words
An arrangement according to claim 8 wherein in a second position of the change-over valve, the first chamber during emptying is connected with the first bore.
Claim 13
Dependent Claim
41 words
An arrangement according to claim 9, wherein in the first and second positions, the second chamber, by means of an interior space enclosed by the pipe, is connected with a second bore of the camshaft connected to the oil circulating system.
Claim 14
Dependent Claim
46 words
An arrangement according to claim 10, wherein the change-over valve is arranged in parallel to the oil-carrying duct of the oil circulating system and has annuli which, in the first and second positions are connected by first and second pipes to the first and second bores.
Claim 15
Dependent Claim
17 words
An arrangement according to claim 11, further comprising check valves between the oil-carrying duct and the annuli.
Claim 16
Dependent Claim
47 words
An arrangement according to claim 12, further comprising a lubricating circulating system, and wherein the duct leads downstream of the change-over valve into a pressure reducing valve which, via the lubricating circulating system of the crankshaft of the internal-combustion engine, is connected with bearings of the camshaft.
Claim 17
Dependent Claim
34 words
An arrangement according to claim 13 wherein the duct downstream of the change-over valve has a junction which is connected with a pump, the change-over valve, an on/off valve, and the lubricating circulating system.
Claim 18
Dependent Claim
36 words
An arrangement according to claim 14, further comprising a control unit, and wherein the on/off valve, as a function of input signals of the control unit, shifts the change-over valve between the first and second positions.
Claim 19
Dependent Claim
54 words
An arrangement according to claim 10, wherein the recess has a first diameter from the end along an axis to behind the first bore, has a smaller second diameter between the first and second bores, and has a still smaller, third diameter from between the first and second bores to behind the second bore.
Claim 20
Dependent Claim
22 words
An arrangement according to claim 10 wherein the first and second bores are arranged inside a separate bearing point of the camshaft.
Claim 21
Dependent Claim
41 words
An arrangement according to claim 10, wherein the first bore leads into a groove of a first bearing of the camshaft and in that the second bore leads into a groove of a second bearing situated adjacent to the first bearing.
Claim 22
Dependent Claim
177 words
An arrangement for automatically controlled changing of a relative rotating position of two shafts in an internal-combustion engine, comprising: at least one camshaft which can be rotated as a function of parameters of the internal-combustion engine relative to a shaft driving the camshaft and having a second internal toothing; an oil circulating system; a coupling member having a first internal toothing and a second external toothing and which is coupled to the oil circulating system so as to be axially shiftable between at least two end positions; a wheel which drives the camshaft and having a first external toothing and which, via the coupling member, acts upon the second internal toothing of the camshaft, wherein the first external toothing of the wheel interacts with the first internal toothing of the coupling member, and the second internal toothing of the camshaft interacts with the second external toothing of the coupling member; further comprising at least two camshafts, wherein a change-over valve with a check valve and a duct with a pressure reducing valve is assigned to each camshaft.
Claim 23
Dependent Claim
177 words
An arrangement for automatically controlled changing of a relative rotating position of two shafts in an internal-combustion engine, comprising: at least one camshaft which can be rotated as a function of parameters of the internal-combustion engine relative to a shaft driving the camshaft and having a second internal toothing; an oil circulating system; a coupling member having a first internal toothing and a second external toothing and which is coupled to the oil circulating system so as to be axially shiftable between at least two end positions; a wheel which drives the camshaft and having a first external toothing and which, via the coupling member, acts upon the second internal toothing of the camshaft, wherein the first external toothing of the wheel interacts with the first internal toothing of the coupling member, and the second internal toothing of the camshaft interacts with the second external toothing of the coupling member; further comprising at least two camshafts, wherein a change-over valve with a check valve and a duct with a pressure reducing valve is assigned to each camshaft.
References Cited (Backward Citations)
DE361980C
Cited
US4787345A
Cited
EP0245791B1
Cited
EP0335083A1
Cited
US4903650A
Cited
EP0356162A1
Cited
US5012774A
Cited
US5067450A
Cited
DE4029849A1
Cited
US5058539A
Cited
US5088456A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-12-15 | 1996-06-15 | 1996-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-15 | 2000-06-15 | 2000-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-15 | 2004-06-15 | 2004-12-15 | $7700.00 | Window Closed / Lapsed |