Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid controlled mechanical clutch or brake
Patent
1995-10-16
1997-08-12
Ta, Khoi Q.
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Fluid controlled mechanical clutch or brake
475258, 475259, 475267, F16H 364, F16H 4900, F04C 214
Patent
active
056559844
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a transmission apparatus with a gradual start device, in particular for a vehicle.
Conventionally, a vehicle's transmission apparatus comprises a multiple-ratio gearbox controlled manually or automatically and, between this gearbox and the engine, a clutch or hydraulic connecting device to enable the engine to operate when the vehicle is stationary, and to enable the vehicle to be set in motion gradually by the engine once the engine itself has been started.
There is also, in general, an inertia flywheel which is driven in rotation by the engine's shaft and may form one of the clutch plates. The inertia flywheel serves to ensure the continuity of operation of the engine when the clutch is in the released condition and/or when the gearbox is in the neutral position, to enable the engine shaft to pass through the angular ranges where the torque delivered by the engine is negative. When the vehicle is in motion and its driving wheels are coupled to the engine, the inertia of the vehicle is sufficient to maintain the motion of the engine, and then the inertia flywheel even becomes a disadvantage since it adds its own moment of inertia to the inertia of the vehicle's mass during acceleration.
Generally speaking the known clutch, torque converter, hydraulic coupling and inertia wheel devices are expensive, heavy and cumbersome.
WO-A-91 13 275 discloses a transmission apparatus comprising a differential mechanism in which a neutral condition is completed by allowing a reaction member to perform a reverse rotation which is normally precluded by a free-wheel. For allowing such reverse rotation, the stationary part of the free-wheel is released by releasing a brake mounted operatively between said stationary part and the housing of the transmission apparatus. The brake is shown as being a band-brake, according to the solution which is conventional in transmission devices. This type of brake is commercially relevant only if its life time is of the same order of magnitude as the vehicle to which it is fitted, because exchange of the brake is complicated and necessitates at least partial disassembling of the transmission apparatus. Now the brake of this document, performing progressive transition from the neutral condition to the condition where movement is transmitted to the output shaft, has to provide at each gradual start of the vehicle a relatively great amount of kinetic energy, proportional to the mass of the vehicle.
The object of this invention is to provide a transmission apparatus of the kind disclosed in WO-A-91 13 275 but where the brake performing gradual starting does not result in complicated maintenance problems for the transmission apparatus.
According to the invention, there is provided a transmission apparatus in which a differential-type transmission device comprises rotating elements with intermeshing teeth, one of which elements is connected to an input shaft and the other to an output shaft of the device, said rotating elements comprising a reaction element and the transmission apparatus further comprising selective locking means mounted operatively between the reaction element and a housing of the transmission apparatus the selective locking means comprising means having a free-whell function for enabling said reaction element to rotate in the same direction as said input and said output when a selective connection device connects at least indirectly the rotating elements of said differential mechanism in order to cause direct drive operation in which device, at least when the means having a free-wheel function is locked, said reaction element is integral in rotation with an rotor of a brake being able to be selectively released in order to release said rotor and said reaction element in relation to said housing and to cause the transmission system to operate in a neutral condition, and to be gradually activated so as gradually to immobilise said rotor in relation to said housing so as to enable said reaction element to be selectively immobilised and released, res
REFERENCES:
patent: 2254335 (1941-09-01), Vincent
patent: 4441691 (1984-04-01), Nagahara et al.
patent: 4995862 (1991-02-01), Arocha
Antonov Automotive Technologies B.V.
Ta Khoi Q.
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