US3600963A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Countershaft gear-shift transmission
Assignee: Saurer AG
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Filing: 1969-08-27
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Granted: 1971-08-24
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Expires: 1989-08-27
Abstract
Abstract A countershaft gear-shift transmission with constantly meshing gear pairs includes a drive shaft, a main shaft coaxial with the drive shaft and a countershaft parallel to the main and drive shafts. A first countershaft gear is fixed to rotate with the countershaft and a first main shaft gear is rotatable on the main shaft and constantly meshes with the first countershaft gear. An additional countershaft gear or gears are rotatably mounted on the countershaft and constantly mesh with gears rotatable on the drive shaft and on the main shaft. Shifting clutch means are operatively associated with the gears and are selectively operable to couple the first countershaft gear to the drive shaft through either the first main shaft gear or one or more of the additional countershaft gears. Operating means are provided for the shifting clutch means, and pneumatically actuated interlocking means are provided to assure proper operation of the operating means. The transmission may have eight forward speeds and two reverse speeds or may have 12 forward speeds and two reverse speeds. The reverse speed gearing includes a center gear and a ring gear meshing with at least one idler gear mounted between the center and ring gears.
Inventors
- 👤 August Thomas Portmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:47
CPC Classifications
F; F16; F16H; F16H3/00; F16H3/02; F16H3/08; F16H3/087; F16H3/093; F16H3/097; F16H3/091; F16H3/0915; F16H63/00; F16H63/02; F16H63/30; F16H63/34; F16H63/3408; F16H2003/0933; F16H2200/00; F16H2200/003; F16H2200/006; F16H2200/0065; F16H2200/0082; F16H2200/0086; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19228; Y10T74/19377; Y10T74/19386; Y10T74/194
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
280 words
A countershaft gear-shift transmission with constantly meshing gear pairs comprising, in combination, a transmission housing; a drive shaft; a main shaft; a countershaft; means rotatably mounting said shafts in said housing with said countershaft in spaced parallel relation to said drive shaft and said main shaft; and hollow shaft rotatably mounted on said countershaft; a first countershaft gear fixed to rotate with said countershaft; a first main shaft gear rotatable on said main shaft and constantly meshing with said first countershaft gear; a second countershaft gear conjointly rotatably with said countershaft; a second main shaft gear constantly meshing with such second countershaft gear and rotatably mounted on said main shaft; third and fourth countershaft gears fixedly mounted on said hollow shaft to rotate therewith; a third main shaft gear rotatably mounted on said main shaft and constantly meshing with said third countershaft gear; a drive shaft gear rotatably mounted on said drive shaft and constantly meshing with said fourth countershaft gear; shifting clutch means operatively associated with said gears, and including a main shaft shifting clutch selectively operable to couple one of said first and second main shaft gears with said main shaft to rotate conjointly with said main shaft, a drive shaft clutch fixed to said drive shaft and selectively operable to couple one of said drive shaft gear and said third main shaft gear with said drive shaft to rotate conjointly with said drive shaft, a main shaft gear clutch selectively operable to couple said first main shaft gear with said third main shaft gear, and a countershaft clutch operable to couple said first countershaft gear with said hollow shaft; and operating means for said shifting clutch means.
Claim 2
Dependent Claim
280 words
A countershaft gear-shift transmission with constantly meshing gear pairs comprising, in combination, a transmission housing; a drive shaft; a main shaft; a countershaft; means rotatably mounting said shafts in said housing with said countershaft in spaced parallel relation to said drive shaft and said main shaft; and hollow shaft rotatably mounted on said countershaft; a first countershaft gear fixed to rotate with said countershaft; a first main shaft gear rotatable on said main shaft and constantly meshing with said first countershaft gear; a second countershaft gear conjointly rotatably with said countershaft; a second main shaft gear constantly meshing with such second countershaft gear and rotatably mounted on said main shaft; third and fourth countershaft gears fixedly mounted on said hollow shaft to rotate therewith; a third main shaft gear rotatably mounted on said main shaft and constantly meshing with said third countershaft gear; a drive shaft gear rotatably mounted on said drive shaft and constantly meshing with said fourth countershaft gear; shifting clutch means operatively associated with said gears, and including a main shaft shifting clutch selectively operable to couple one of said first and second main shaft gears with said main shaft to rotate conjointly with said main shaft, a drive shaft clutch fixed to said drive shaft and selectively operable to couple one of said drive shaft gear and said third main shaft gear with said drive shaft to rotate conjointly with said drive shaft, a main shaft gear clutch selectively operable to couple said first main shaft gear with said third main shaft gear, and a countershaft clutch operable to couple said first countershaft gear with said hollow shaft; and operating means for said shifting clutch means.
Claim 3
Dependent Claim
84 words
A countershaft gear-shift transmission, as claimed in claim 1, including a spur gear fixed to that end of said hollow shaft remote from said first countershaft gear for rotation with said hollow shaft; at least one pinion rotatably mounted in said housing and constantly meshing with said spur gear; and an internal ring gear constantly meshing with said pinion, said shifting clutch means including a shifting clutch selectively operable to couple said internal ring gear with said countershaft for conjoint rotation with said countershaft.
Claim 4
Dependent Claim
162 words
A countershaft gear-shift transmission, as claimed in claim 1, in which said main shaft gear clutch and said countershaft clutch are of gear tooth design; a double shifting fork operable to actuate selectively both said main shaft gear clutch and said countershaft clutch; a shifting shaft rotatably mounted in said housing and movable axially; a manual shifting lever connected to said shifting shaft; said shifting shaft being operatively connected to said double shifting fork to effect selectively engagement of either said main shaft gear clutch or said countershaft gear clutch; said manual shifting lever being movable in a shifting template having shifting slots for the Respective speeds; a fluid pressure actuator connected to said main shaft clutch to shift said main shaft clutch; a fluid pressure operable valve controlling said fluid pressure actuator; and means operatively associated with said manual shifting lever and operably, responsive to movement of said manual shifting lever, transversely of the speed selecting slots, to operate said valve.
Claim 5
Dependent Claim
59 words
A countershaft gear-shift transmission, as claimed in claim 2, including two roller bearings supporting said countershaft in said transmission housing; one of said roller bearings being adjacent said second countershaft gear on the side thereof remote from said first countershaft gear, and the other of said roller bearings being positioned between said spur gear and said fourth countershaft gear.
Claim 6
Dependent Claim
102 words
A countershaft gear-shift transmission, as claimed in claim 1, in which said drive shaft and said main shaft are coaxial, and said drive shaft having, at its end adjacent said main shaft, a cylindrical recess rotatably receiving a cylindrical extension on said main shaft; and two roller bearings conjointly supporting said drive shaft and said main shaft in said transmission housing, one of said roller bearings adjoining said drive shaft gear on the side thereof remote from said main shaft, and the other of said roller bearings adjoining said second main shaft gear on the side thereof remote from said drive shaft.
Claim 7
Dependent Claim
39 words
A countershaft gear-shift transmission, as claimed in claim 1, including a spur gear fixed on said hollow shaft to rotate therewith and positioned between said third and fourth countershaft gears, said spur gear constituting an oil pump driving gear.
Claim 8
Dependent Claim
129 words
A countershaft gear-shift transmission, as claimed in claim 1, including a fifth countershaft gear rotatably mounted on said countershaft; a fourth main shaft gear constantly meshing with said fifth countershaft gear and rotatable conjointly with said main shaft; said main shaft shifting clutch being between said first and second main shaft gears and shiftable selectively between an ineffective position and either of two effective positions, said main shaft shifting clutch, in one effective position, coupling said first main shaft gear to said main shaft for conjoint rotation therewith and, in the other effective position, coupling said second main shaft gear to said main shaft for conjoint rotation therewith; and an additional countershaft clutch operable to couple said fifth countershaft gear with said countershaft for conjoint rotation with the latter.
Claim 9
Dependent Claim
84 words
A countershaft gear-shift transmission, as claimed in claim 7, including a spur gear fixed to that end of said hollow shaft remote from said first countershaft gear for rotation with said hollow shaft; at least one pinion rotatably mounted in said housing and constantly meshing with said spur gear; and an internal ring gear constantly meshing with said pinion; said shifting clutch means including a shifting clutch selectively operable to couple said internal ring gear with said countershaft for conjoint rotation with said countershaft.
Claim 10
Dependent Claim
227 words
A countershaft gear-shift transmission, as claimed in claim 7, in which said operating means includes a double shifting fork operable to actuate selectively said main shaft gear clutch and said countershaft gear clutch; a shifting shaft rotatably mounted in said housing and movable axially; a manual shifting lever connected to said shifting shaft; said shifting shaft being operatively connected to said double shifting fork to effect selectively engagement of either said main shaft gear clutch or said countershaft gear clutch; said manual shifting lever being movable in a shifting template having shifting slots for the respective speeds; a pair of pressure medium actuated valves; means operatively associated with said manual shifting lever and operable, responsive to movement of said manual shifting lever transversely of the speed selecting slots, to actuate one of said valves in one end position of said manual shifting lever and the otheR of said valves in the other end position of said shifting lever; a first fluid pressure actuator connected to said main shaft clutch to operate the latter; means connecting said valves in controlling relation with said first fluid pressure actuator; said first fluid pressure actuator including a piston rod; a second fluid pressure actuator connected to said additional countershaft clutch to operate the latter; and a valve controlling operation of said second fluid pressure actuator and controlled by said piston rod.
Claim 11
Dependent Claim
43 words
A countershaft gear-shift transmission, as claimed in claim 9, including fluid pressure actuated locking means operatively associated with said shifting shaft and operable to lock said shifting shaft against rotation in intermediate positions of said main shaft clutch and said additional countershaft clutch.
References Cited (Backward Citations)
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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) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |