US3877320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Planetary automotive transmission
Assignee: Nissan Motor Co Ltd
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Filing: 1974-02-07
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Granted: 1975-04-15
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Expires: 1994-02-07
Abstract
Abstract A planetary gear train comprises a combination of three planetary gear assemblies each having an externally toothed sun gear, an internally toothed ring gear, planet pinions rotatable between the sun and ring gears, and a pinion carrier connected to the planet pinions. The individual planetary gear assemblies are controlled to provide four forward and one reverse speed gear ratios through selective actuation of a first clutch associated with the ring gear of the first planetary gear assembly, a second clutch associated with the sun gears of the first and second planetary gear assemblies, a first brake also associated with the sun gears of the first and second planetary gear assemblies, a second brake associated with the ring gear of the second planetary gear assembly and either the sun gear or the pinion carrier of the third planetary gear assembly, and a third brake associated with either the pinion carrier or the ring gear of the third planetary gear assembly.
Inventors
- 👤 Tetsuya Iijima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:59
CPC Classifications
F; F16; F16H; F16H3/00; F16H3/44; F16H3/62; F16H3/66; F16H3/666; F16H2200/00; F16H2200/003; F16H2200/0043; Y; Y10; Y10S; Y10S475/00; Y10S475/904
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
292 words
An automotive power transmission system for providing four forward and one reverse speed, comprising, in combination, a drive shaft, a driven shaft, first, second and third planetary gear assemblies each comprising an externally toothed sun gear rotatable about an axis in line with said driven shaft, an internally toothed ring gear rotatable about said axis, at least one planet pinion rotatable about its own axiS and about said axis in line with the driven shaft and engaging on one hand with said sun gear and on the other hand with said ring gear and a pinion carrier connected to said at least one planet pinion and rotatable therewith about said axis in line with the driven shaft, the sun gears of the first and second planetary gear assemblies being connected to and rotatable with each other through a first connecting member, the pinion carriers of the first and second planetary gear assemblies being connected to and rotatable with the driven shaft, the ring gear of the second planetary gear assembly being connected to and rotatable with one of the three members, viz., the sun gear, the ring gear and the pinion carrier of the third planetary gear assembly through a second connecting member, one of the remaining two of said three members being connected to and rotatable with the driven shaft, a first clutch connected between the drive shaft and the ring gear of the first planetary gear assembly, a second clutch connected between the drive shaft and said first connecting member, a first brake engageable with said first connecting member, a second brake engageable with said second connecting member and a third brake engageable with the other of said remaining two of said three members of the third planetary gear assembly.
Claim 2
Dependent Claim
292 words
An automotive power transmission system for providing four forward and one reverse speed, comprising, in combination, a drive shaft, a driven shaft, first, second and third planetary gear assemblies each comprising an externally toothed sun gear rotatable about an axis in line with said driven shaft, an internally toothed ring gear rotatable about said axis, at least one planet pinion rotatable about its own axiS and about said axis in line with the driven shaft and engaging on one hand with said sun gear and on the other hand with said ring gear and a pinion carrier connected to said at least one planet pinion and rotatable therewith about said axis in line with the driven shaft, the sun gears of the first and second planetary gear assemblies being connected to and rotatable with each other through a first connecting member, the pinion carriers of the first and second planetary gear assemblies being connected to and rotatable with the driven shaft, the ring gear of the second planetary gear assembly being connected to and rotatable with one of the three members, viz., the sun gear, the ring gear and the pinion carrier of the third planetary gear assembly through a second connecting member, one of the remaining two of said three members being connected to and rotatable with the driven shaft, a first clutch connected between the drive shaft and the ring gear of the first planetary gear assembly, a second clutch connected between the drive shaft and said first connecting member, a first brake engageable with said first connecting member, a second brake engageable with said second connecting member and a third brake engageable with the other of said remaining two of said three members of the third planetary gear assembly.
Claim 3
Dependent Claim
74 words
An automotive power transmission system as claimed in claim 1, in which the sun gear of the third planetary gear assembly is connected to and rotatable with the ring gear of the second planetary gear assembly so that one of the ring gear and the pinion carrier of the third planetary gear assembly is connected to the driven shaft through said second connecting member and the other thereof is connected to said third brake.
Claim 4
Dependent Claim
36 words
An automotive power transmission system as claimed in claim 2, in which the ring gear and the pinion carrier of the third planetary gear assembly are respectively connected to the third brake and the driven shaft.
Claim 5
Dependent Claim
71 words
An automotive power transmission system as claimed in claim 3, in which the sun gear and the ring gear of the first planetary gear assembly are rotatable in mutually opposite directions when the associated pinion carrier is locked and in which the sun gear and the ring gear of each of the second and third planetary gear assemblies are rotatable in the same direction when the associated pinion carrier is locked.
Claim 6
Dependent Claim
169 words
An automotive power transmission system as claimed in claim 4, in which said first clutch is engaged to cause the ring gear of the first planetary gear assembly to be driven by the drive shaft for achieving any one of the first to fourth forward speed gear ratios, said second clutch is engaged to cause the sun gears of the first and second planetary gear assemblies to be driven by the drive shaft for achieving the fourth forward speed or reverse speed gear ratio, said first brake is actuated to hold stationary the sun gears of the first and second planetary gear assemblies for achieving the third forward speed gear ratio, said second brake is actuated to hold stationary the ring gear and the sun gear of the second and third planetary gear assemblies, respectively, for achieving the second forward speed gear ratio, and said third brake is actuated to hold stationary the ring gear of the third planetary gear assembly for achieving the first forward speed gear ratio.
Claim 7
Dependent Claim
40 words
An automotive power transmission system as claimed in claim 4, in which said first, second and third planetary gear assemblies are disposed in series between the input end and the output end of the power transmission system in this sequence.
Claim 8
Dependent Claim
40 words
An automotive power transmission system as claimed in claim 4, in which said second, first and third planetary gear assemblies are disposed in series between the input end and the output end of the power transmission system in this sequence.
Claim 9
Dependent Claim
36 words
An automotive power transmission system as claimed in claim 2, in which the ring gear and the pinion carrier of the third planetary gear assemBly are connected respectively to the driven shaft and the third brake.
Claim 10
Dependent Claim
71 words
An automotive power transmission system as claimed in claim 8, in which the sun gear and the ring gear of each of said first and second planetary gear assemblies are rotatable in mutually opposite directions when the associated pinion carrier is locked, and in whcih the sun gear and the ring gear of said second planetary gear assembly are rotatable in the same direction when the associated pinion carrier is locked.
Claim 11
Dependent Claim
164 words
An automotive power transmission system as claimed in claim 9, in which said first clutch is engaged to cause the ring gear of the first planetary gear assembly to be driven by the drive shaft for achieving any one of the first to fourth forward speed gear ratios, said second clutch is engaged to cause the sun gears of the first and second planetary gear assemblies to be driven by the drive shaft for achieving the fourth-forward or reverse-speed gear ratio, said first brake is actuated to lock the sun gears of the first and second planetary gear assemblies for achieving the third forward speed gear ratio, said second brake is actuated to hold stationary the ring gear and the sun gear of the second and third planetary gear assemblies, respectively, for achieving the second forward speed gear ratio, and said third brake is actuated to hold the pinion carrier of the third planetary gear assembly for achieving the first forward speed gear ratio.
Claim 12
Dependent Claim
71 words
An automotive power transmission system as claimed in claim 1, in which the sun gear of the third planetary gear assembly is connected to the driven shaft so that one of the ring gear and the pinion carrier of the third planetary gear assembly is connected to the ring gear of the second planetary gear assembly through said second connecting member and the other thereof is connected to said third brake.
Claim 13
Dependent Claim
42 words
An automotive power transmission system as claimed in claim 11, in which the ring gear and the pinion carrier of the third planetary gear assembly are connected respectively to the third brake and the ring gear of the second planetary gear assembly.
Claim 14
Dependent Claim
71 words
An automotive power transmission system as claimed in claim 12, in which the sun gear and the ring gear of the first planetary gear assembly are rotatable in mutually opposite directions when the associated pinion carrier is locked, and in which the sun gear and the ring gear of each of the second and third planetary gear assemblies are rotatable in the same direction when the associated pinion carrier is locked.
Claim 15
Dependent Claim
165 words
An automotive power transmission system as claimed in claim 13, in which said first clutch is engaged to cause the ring gear of the first planetary gear assembly to be driven by the drive shaft for achieving any one of the first to fourth forward speed gear ratios, said second clutch is engaged to cause the sun gears of the first and second planetary gear assemblies to be driven by the drive shaft for achieving the fourth forward-speed or reverse speed gear ratios, said first brake is actuated to lock the sun gears of the first and second planetary gear assemblies for achieving the third forward speed gear ratio, said second brake is actuated to lock the ring gear and the pinion carrier of the second and third planetary gear assemblies, respectively, for achieving the second forward speed gear ratio, and said third brake is actuated to lock the ring gear of the third planetary gear assembly for achieving the first forward speed gear ratio.
Claim 16
Dependent Claim
42 words
An automotive power transmission system as claimed in claim 11, in which the ring gear and the pinion carrier of the third planetary gear assembly are respectively connected to the ring gear of the second planetary gear assembly and the third brake.
Claim 17
Dependent Claim
71 words
An automotive power transmission system as claimed in claim 15, in which the sun gear and the ring gear of each of the first and third planetary gear assemblies are rotatable in mutually opposite directions when the associated pinion carrier is locked, and in which the sun gear and the ring gear of the second planetary gear assembly are rotatable in the same direction when the associated pinion carrier is locked.
Claim 18
Dependent Claim
163 words
An automotive power transmission system as claimed in claim 16, in which said first clutch is engaged to cause the ring gear of the first planetary gear assembly to be driven by the drive shaft for achieving any one of the first to fourth forward speed gear ratios, said second clutch is engaged to cause the sun gears of the first and second planetary gear assemblies to be driven by the drive shaft for achieving the fourth forward or reverse speed gear ratio, said first brake is actuated to hold stationary the sun gears of the first and second planetary gear assemblies for achieving the third forward speed gear ratio, said second brake is actuated to hold stationary the ring gears of the second and third planetary gear assemblies for achieving the second forward speed gear ratio, and said third brake is actuated to hold stationary the pinion carrier of the third planetary gear assembly for achieving the first forward speed gear ratio.
Claim 19
Dependent Claim
59 words
An automotive power transmission system as claimed in claim 1, further comprising a first series combination of a brake and a one-way clutch disposed in parallel to said first brake, a second series combination of a brake and a one-way clutch disposed in parallel to said second brake and a one-way brake disposed in parallel to said third brake.
References Cited (Backward Citations)
US3823622A
Cited
US3817124A
Cited
US3811343A
Cited
US3812739A
Cited
US3701293A
Cited
US3736815A
Cited
US3820418A
Cited
US3815445A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |