US3677104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed change mechanism
Assignee: Aisin Corp
•
Filing: 1970-10-07
•
Granted: 1972-07-18
•
Expires: 1990-10-07
Abstract
Abstract The usual shift collars in a speed change mechanism are operated by a plurality of shift forks. The shift forks are operable under the control of a cam disc having one or more cam grooves therein in which are located a plurality of control pins secured to each shift fork respectively. The cam disc is rotated by means of a hydraulic servo motor which is operable under the control of a vehicle speed responsive device.
Inventors
- 👤 Koichiro Hirozawa
- 👤 Tadao Asano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:05
CPC Classifications
F; F16; F16H; F16H63/00; F16H63/02; F16H63/08; F16H63/16; F16H63/18; F16H61/00; F16H61/26; F16H61/28; F16H61/30; F16H61/02; F16H61/0262; F16H61/0265; F16H61/0267; F16H61/0269; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19251; Y10T74/19256; Y10T74/1926; Y10T74/19279; Y10T74/19535
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
155 words
In a speed change mechanism having an input shaft, an output shaft and gear means arrangeD between both shafts capable of providing a plurality of speed change ratios between said shafts by the proper selection of said gears, said speed change mechanism comprising a power source, gear shifting means having speed change pin means secured thereto, a cam assembly for displacing said speed change pin means for the proper selection of said gears, servo means operatively connected to said cam assembly, a shift valve assembly for imparting power from said power source to said servo means so as to displace said servo means and said cam assembly in one of two opposite directions, and vehicle speed responsive means for producing a signal in response to the vehicle speed whereby said shift valve assembly is moved unidirectionally by said responsive means and is also movable in the reverse direction by the displacement of said cam assembly.
Claim 2
Dependent Claim
155 words
In a speed change mechanism having an input shaft, an output shaft and gear means arrangeD between both shafts capable of providing a plurality of speed change ratios between said shafts by the proper selection of said gears, said speed change mechanism comprising a power source, gear shifting means having speed change pin means secured thereto, a cam assembly for displacing said speed change pin means for the proper selection of said gears, servo means operatively connected to said cam assembly, a shift valve assembly for imparting power from said power source to said servo means so as to displace said servo means and said cam assembly in one of two opposite directions, and vehicle speed responsive means for producing a signal in response to the vehicle speed whereby said shift valve assembly is moved unidirectionally by said responsive means and is also movable in the reverse direction by the displacement of said cam assembly.
Claim 3
Dependent Claim
28 words
In a speed change mechanism as set forth in claim 1 wherein said speed change pin means are engaged in a cam groove member of said cam assembly.
Claim 4
Dependent Claim
34 words
In a speed change mechanism as set forth in claim 1, wherein said servo means comprises a servo cylinder, a rotatable piston disposed in said servo cylinder and two chambers partitioned by said piston.
Claim 5
Dependent Claim
35 words
In a speed change mechanism as set forth in claim 1, wherein said shift valve assembly comprises a shift valve for controlling ports in communication with said power source, said servo cylinder, and drain ports.
Claim 6
Dependent Claim
34 words
In a speed change mechanism as set forth in claim 2, wherein the cam groove member is comprised of two cam grooves disposed independently of and opposite to each other in said cam assembly.
Claim 7
Dependent Claim
29 words
In a speed change mechanism as set forth in claim 2, wherein said cam groove member is a unitary cam groove having ends which do not meet each other.
Claim 8
Dependent Claim
28 words
In a speed change mechanism as set forth in claim 2, wherein said groove member is a unitary cam groove in the form of a continuous closed loop.
References Cited (Backward Citations)
US1345497A
Cited
US2178356A
Cited
US2311010A
Cited
US2590232A
Cited
US2756611A
Cited
US3324745A
Cited
US3457798A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |