US3915027A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmission shifting
Assignee: Borg Warner Corp
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Filing: 1974-07-01
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Granted: 1975-10-28
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Expires: 1994-07-01
Abstract
Abstract A multiple speed, sliding gear transmission characterized by the provision of shift forks carried by a shift rail and having tynes extending into proximity with synchronizing clutch mechanisms. Each tyne defines a notch in which a pad is retained, the pad having a crowned surface engageable with a clutch mechanism for effecting movement thereof along an axis. The crowned surface rolls along the surface of the clutch mechanism to shift the point of engagement toward the axis passing through the center of rotation of the clutch mechanism as the shift fork is deflected under load to reduce bending forces on the clutch mechanism to a minimum.
Inventors
- 👤 John P Simmons
- 👤 Donald W Kelbel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:53
CPC Classifications
F; F16; F16H; F16H63/00; F16H63/02; F16H63/30; F16H63/32; F16H2063/324; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20012; Y10T74/20018; Y10T74/20177; Y10T74/20183
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
82 words
In a transmission including input and output shafts, gearing means engageable for establishing at least one drive ratio from said input shaft to said output shaft, clutching means movable along an axis for engaging said gearing means, and shifting means engageable with said clutching means for effecting movement thereof; the improvement wherein said shifting means defines a crown-shaped surface contacting said clutching means relatively far from said axis under relatively light load and relatively near to said axis under relatively heavy load.
Claim 2
Dependent Claim
82 words
In a transmission including input and output shafts, gearing means engageable for establishing at least one drive ratio from said input shaft to said output shaft, clutching means movable along an axis for engaging said gearing means, and shifting means engageable with said clutching means for effecting movement thereof; the improvement wherein said shifting means defines a crown-shaped surface contacting said clutching means relatively far from said axis under relatively light load and relatively near to said axis under relatively heavy load.
Claim 3
Dependent Claim
38 words
The invention according to claim 1, said shifting means including a shift fork engageable with said clutching means, said shift fork defining a notch, and a pad loosely carried in said notch, said pad defining said crown-shaped surface.
Claim 4
Dependent Claim
35 words
The invention according to claim 2, said clutching means defining a groove, and said pad extending at least partially into said groove and retained in said notch by said shift fork and said clutching means.
Claim 5
Dependent Claim
125 words
In a transmission including a housing, input and output shafts journalled in said housing, gearing means engageable for establishing at least one drive ratio from said input shaft to said output shaft, said gearing means including a gear journalled on one of said shafts, clutching means movable for engaging said gear with said one shaft, and shifting means engageable with said clutching means for effecting movement thereof; the improvement wherein said shifting means includes a shift fork defining a notch, a pad loosely carried in said notch and at least partially retained therein by said clutching means, said pad defining a crown-shaped surface engageable with said clutching means in one area for effecting initial movement thereof and in another area for effecting subsequent movement thereof.
Claim 6
Dependent Claim
125 words
In a transmission including a housing, input and output shafts journalled in said housing, gearing means engageable for establishing at least one drive ratio from said input shaft to said output shaft, said gearing means including a gear journalled on one of said shafts, clutching means movable for engaging said gear with said one shaft, and shifting means engageable with said clutching means for effecting movement thereof; the improvement wherein said shifting means includes a shift fork defining a notch, a pad loosely carried in said notch and at least partially retained therein by said clutching means, said pad defining a crown-shaped surface engageable with said clutching means in one area for effecting initial movement thereof and in another area for effecting subsequent movement thereof.
Claim 7
Dependent Claim
39 words
The invention according to claim 4, said shifting means including a movable shift rail spaced from said one shaft, said shift fork supported by said shift rail and defining said notch beyond the center line of said one shaft.
Claim 8
Dependent Claim
144 words
In a transmission including input and output shafts and gearing means engageable for establishing at least one drive ratio therebetween, clutching means including a clutch element supported by one of said shafts and movable therealong for engaging said gearing means, said clutch element defining a groove therein, a movable shift rail spaced from said one shaft, a shift fork supported by said shift rail and movable therewith for effecting movement of said clutch element, said shift fork having a tyne extending beyond the center line of said one shaft, a pad carried by said tyne and defining a crown-shaped surface in said groove having a contact area engaging said clutch element for effecting movement thereof upon movement of said shift rail, said contact area located initially at a point displaced from said center line and said contact area subsequently moving toward said center line.
Claim 9
Dependent Claim
144 words
In a transmission including input and output shafts and gearing means engageable for establishing at least one drive ratio therebetween, clutching means including a clutch element supported by one of said shafts and movable therealong for engaging said gearing means, said clutch element defining a groove therein, a movable shift rail spaced from said one shaft, a shift fork supported by said shift rail and movable therewith for effecting movement of said clutch element, said shift fork having a tyne extending beyond the center line of said one shaft, a pad carried by said tyne and defining a crown-shaped surface in said groove having a contact area engaging said clutch element for effecting movement thereof upon movement of said shift rail, said contact area located initially at a point displaced from said center line and said contact area subsequently moving toward said center line.
Claim 10
Dependent Claim
102 words
In combination, a shaft, clutch means slidable axially on said shaft, said clutch means defining a groove transverse to the slidable axis, a shift fork including a sleeve and a tyne extending at least partially into said groove, a rail extending loosely through said sleeve and movable for engaging said shift fork and carrying said tyne into engagement with said clutch means, said tyne defining a notch at least partially within said groove, and a pad loosely supported in said notch and retained therein by said tyne and clutch means, said tyne contacting said clutch means through said pad for said engagement.
Claim 11
Dependent Claim
102 words
In combination, a shaft, clutch means slidable axially on said shaft, said clutch means defining a groove transverse to the slidable axis, a shift fork including a sleeve and a tyne extending at least partially into said groove, a rail extending loosely through said sleeve and movable for engaging said shift fork and carrying said tyne into engagement with said clutch means, said tyne defining a notch at least partially within said groove, and a pad loosely supported in said notch and retained therein by said tyne and clutch means, said tyne contacting said clutch means through said pad for said engagement.
Claim 12
Dependent Claim
91 words
The invention according to claim 7, said rail oriented parallel to said shaft and being rotatable and axially movable in said sleeve for respectively engaging said shift fork and carrying said tyne into engagement with said clutch means, said shift fork being flexible upon said engagement under load, said pad defining a curved surface contacting said clutch means beyond the mid point thereof under light load, said contact shifting along said curved surface to reduce any bending moment applied to said clutch means as said shift fork flexes under increasing load.
Claim 13
Dependent Claim
63 words
A shift rail adapted for use in a power transmission, said shift rail including a collar portion movably carried by a shifting element and a tyne portion engageable with a shiftable element for movement thereof, and a pad supported by said tyne portion and defining a crown-shaped surface facing the shiftable element and adapted for rolling contact therewith during engagement and movement thereof.
Claim 14
Dependent Claim
63 words
A shift rail adapted for use in a power transmission, said shift rail including a collar portion movably carried by a shifting element and a tyne portion engageable with a shiftable element for movement thereof, and a pad supported by said tyne portion and defining a crown-shaped surface facing the shiftable element and adapted for rolling contact therewith during engagement and movement thereof.
Claim 15
Dependent Claim
20 words
The invention according to claim 9, said tyne portion defining a notch, and said pad loosely carried in said notch.
Claim 16
Dependent Claim
18 words
The invention according to claim 10, said tyne portion and shiftable element retaining said pad in said notch.
Claim 17
Dependent Claim
11 words
The invention according to claim 9, said pad formed from nylon.
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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) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |