Patent US4030971A successfully refreshed from Google Patents.
Patent US3744604A successfully refreshed from Google Patents.
US3744604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronous device for change-speed gears,especially for motor vehicles
Assignee: Dr Ing HCF Porsche AG
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Filing: 1970-12-21
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Granted: 1973-07-10
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Expires: 1990-12-21
Abstract
Abstract A synchronous device for change-speed gears, especially for motor vehicles, wherein slotted correcting rings are under the influence of locking members for increasing the servo effect. During the synchronizing operation, the locking or arresting members are brought into pre-tensioned contact onto the correcting rings between sliding or shiftable stops. The inner surface of the correcting rings and/or the surfaces of the locking members operatively cooperating therewith are provided, at least in part, with a friction layer comprising a thin-walled coating of high friction coefficient material such as copper, titanium, molybdenum or the like.
Inventors
- 👤 J Austen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:06
CPC Classifications
F; F16; F16D; F16D23/00; F16D23/02; F16D23/04; F16D23/06; F16D23/025
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
326 words
Synchronous device arrangement for change-speed gears of the type used on motor vehicles which include a rotating drive shaft and an axially movable shifting sleeve arranged around said drive shaft for selective interengagement with at least one gear positioned around said drive shaft; said arrangement comprising: a slotted correcting ring positioned circumferentially around said drive shaft between said sleeve and said gear, said ring having a radially outwardly facing friction surface for frictionally engaging radially inwardly facing gear teeth provided on said shifting sleeve, locking band means positioned radially inwardly of said ring, said locking band means having radially outwardly facing friction surface means for engaging a radially inwardly facing friction surface provided on said ring, circumferentially movable stop means positioned between the ends of the ring for transferring circumferential movement forces from said ring to said locking band means, and circumferentially fixed stop means positioned on said shaft for limiting circumferential movement of said locking band means, wherein all synchronizing forces resulting from relative circumferential movements between said sleeve and said one gear during the synchronizing process are absorbed by the respective frictional sliding engagement between said radially outwardly facing surface of said ring and said teeth on said sleeve and between said radially inwardly facing surface of said ring and said radially outwardly facing friction surface means of said locking band means, wherein at least one of the two surfaces comprising the radially inwardly facing surface of said ring and the radially outwardly facing surface means of said locking band means is provided with a friction layer for absorbing and transferring away the excessive heat generated during the synchronizing process and for enhancing the frictional engagement of the respective two surfaces, and wherein the friction layer is constructed such that the coefficient of friction for the two surfaces on said ring and locking band means is approximately the same as the coefficient of friction for the surfaces on said ring and said sleeve teeth.
Claim 2
Dependent Claim
326 words
Synchronous device arrangement for change-speed gears of the type used on motor vehicles which include a rotating drive shaft and an axially movable shifting sleeve arranged around said drive shaft for selective interengagement with at least one gear positioned around said drive shaft; said arrangement comprising: a slotted correcting ring positioned circumferentially around said drive shaft between said sleeve and said gear, said ring having a radially outwardly facing friction surface for frictionally engaging radially inwardly facing gear teeth provided on said shifting sleeve, locking band means positioned radially inwardly of said ring, said locking band means having radially outwardly facing friction surface means for engaging a radially inwardly facing friction surface provided on said ring, circumferentially movable stop means positioned between the ends of the ring for transferring circumferential movement forces from said ring to said locking band means, and circumferentially fixed stop means positioned on said shaft for limiting circumferential movement of said locking band means, wherein all synchronizing forces resulting from relative circumferential movements between said sleeve and said one gear during the synchronizing process are absorbed by the respective frictional sliding engagement between said radially outwardly facing surface of said ring and said teeth on said sleeve and between said radially inwardly facing surface of said ring and said radially outwardly facing friction surface means of said locking band means, wherein at least one of the two surfaces comprising the radially inwardly facing surface of said ring and the radially outwardly facing surface means of said locking band means is provided with a friction layer for absorbing and transferring away the excessive heat generated during the synchronizing process and for enhancing the frictional engagement of the respective two surfaces, and wherein the friction layer is constructed such that the coefficient of friction for the two surfaces on said ring and locking band means is approximately the same as the coefficient of friction for the surfaces on said ring and said sleeve teeth.
Claim 3
Dependent Claim
19 words
An arrangement according to claim 1, wherein the friction layer is a thin-walled coating of high friction coefficient material.
Claim 4
Dependent Claim
23 words
An arrangement according to claim 2, wherein the high friction coefficient material is selected from the group consisting of titanium, molybdenum and copper.
Claim 5
Dependent Claim
18 words
An arrangement according to claim 1, wherein both of said two surfaces are provided with a friction layer.
Claim 6
Dependent Claim
19 words
An arrangement according to claim 4, wherein the friction layer is a thin-walled coating of high friction coefficient material.
Claim 7
Dependent Claim
23 words
An arrangement according to claim 5, wherein the high friction coefficient material is selected from the group consisting of titanium, molybdenum and copper.
Claim 8
Dependent Claim
14 words
An arrangement according to claim 2, wherein the high friction coefficient material is titanium.
Claim 9
Dependent Claim
14 words
An arrangement according to claim 2, wherein the high friction coefficient material is molybdenum.
Claim 10
Dependent Claim
14 words
An arrangement according to claim 2, wherein the high friction coefficient material is copper.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |