Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Impeller-turbine type fluid circuit and mechanical path in...
Patent
1992-07-01
1993-10-19
Braun, Leslie A.
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Impeller-turbine type fluid circuit and mechanical path in...
475 36, 475 53, 475 58, F16H 4708, F16H 372
Patent
active
052540510
DESCRIPTION:
BRIEF SUMMARY
The present invention relates a gearshift for transmitting a continuous drive by way of three gear ratios, wherein the power extracted from a motor at any given time is controlled automatically through different gear ratios according to a required application, said gearshift comprising an input shaft and an output shaft having a common centre axis, and a box drum rotatably journalled relative to said centre axis, a power supply gear, a fluid clutch or a means having similar qualities, a first planetary gear, a second planetary gear, as well as a gearshift main shaft whose rotating axis coincides with said centre axis, said input shaft being adapted to transmit a Dower-source activated rotating motion on the one hand to gearshift main shaft and on the other hand, by means of power supply gear, to box drum and to a pump wheel included in fluid clutch.
An object of the invention is to provide a gearshift as described above and particularly a gearshift which requires no sensors, governors or locking keys. This object is achieved according to the invention and the invention is characterized in that power transmission from gearshift input shaft to main shaft is arranged through the intermediary of an overrunning clutch or the like in a manner that said main shaft has a speed of rotation which is at least equal to that of input shaft, that both a sun wheel included in first planetary gear and a sun wheel included in second planetary gear are coupled to main shaft, that a planetary support included in first planetary gear is coupled to a turbine disc included in fluid clutch and a peripheral disc to box drum, that turbine disc of fluid clutch is coupled with gearshift input shaft through the intermediary of an overrunning clutch or the like in a manner that the speed of rotation of turbine disc is limited not to exceed that of input shaft, that a planetary support included in second planetary gear is coupled to drum box and a peripheral disc is journalled to be rotatable relative to centre axis and in such a way fixedly through the intermediary of an overrunning clutch or the like mounted on a stationary body portion that the rotation of peripheral disc is prevented in the direction opposite to the rotating direction of box drum.
A torque supplied by the power source is delivered to a bevel gear type or cylindrical gearwheel type or some other type of appropriate centre boss or to a component otherwise suitable for the distribution of torque. The torsional force of the lowest, mechanical gear ratio is delivered by means of an overrunning clutch or some other device operating on a similar principle to a planetary gear or a transmission unit operating on some other similar principle, the gear ratio being selected according to a required application. The torque of a so-called intermediary gear passes hydrodynamically through the action of a fluid clutch over to a collecting planetary gear at a gear ratio suitable for a given application. The torque of a so-called direct gear passes mechanically through the action of a box drum over to a shaft directly delivering the torque. All three gear ratios participate in the transmission of torque simultaneously - either actively or passively. This way the power extracted from a power source can be transmitted at an optimal gear ratio to a particular service .
The invention will now be described in more detail by way of an example with reference made to the accompanying drawing, in which
FIG. 1 shows a schematic cross-section of a gearshift of the invention.
The main components of a gearshift shown schematically in FIG. 1 include a gearshift input shaft 1 connected through the intermediary of a clutch to a power source, a power supply gear 30, a fluid clutch 40, a first planetary gear 50, a second planetary gear 60, a gearshift main shaft 9, and a gearshift box drum 5 which is fixedly connected (by way of a planetary support 18 included in planetary gear 60) with a gearshift output shaft 20.
The shafts 1, 9 and 20 have a common centre axis 21, the gearshift components being jou
REFERENCES:
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patent: 2176138 (1939-10-01), Kelley
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patent: 3924489 (1975-12-01), Yasuda
patent: 4120213 (1978-10-01), Levy
patent: 4579019 (1986-04-01), Gabriele
patent: 4916973 (1990-04-01), Fuelberth et al.
patent: 4928552 (1990-05-01), Gabriele
Design News, Jul. 21, 1958, vol. 13, No. 15, p. 30.
Braun Leslie A.
Makila Matti
Ta Khoi Q.
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