192 clutches and power-stop control – Vortex-flow drive and clutch – With brake
Patent
1989-03-28
1990-10-09
Lorence, Richard
192 clutches and power-stop control
Vortex-flow drive and clutch
With brake
74391, 475331, 188 18A, 188 716, 180372, F16D 65853, B60T 106
Patent
active
049614851
DESCRIPTION:
BRIEF SUMMARY
The invention concerns wheel drives having a friction brake. Such friction brakes are particularly used for heavy industrial vehicles with liquid recirculation cooling in order to obtain a long duration of the friction lining and high operational safety. A transmission of this kind is known, for instance, in EP 00 58 107. Here the cooling takes place by transmission oil which is radially passed through the brake discs and guided in, and removed from, the pipes that extend within the rotary half-shaft. In said construction, there is no support of the brake discs between the half-shaft and the ring gear and thus there is no especially high speed difference and therefore no high specific braking power. Besides, the planetary transmission, due to its arrangement between the bearing and the brake, is traversed by hot cooling oil and therefore can also be damaged by brake friction. An eventual repair of the transmission would always require complete dismantling of the brake. The dismantling of the whole, not dismember wheel head, including the ring-gear carrier, is not possible without propping the vehicle up, since the hub of the ring-gear carrier supports the wheel bearings and the transmission housing can be dismantled only by breaking up the wheel in several axially divided components. Finally, the accommodation of the oil feed pipe in rotating shafts is expensive, causes sealing problems, and is not suitable for steering axles. A higher brake pressure is also required in the known brake, since the brake cylinder and the discs proper cannot be adequately designed with a clearly larger diameter than the pitch of the planetary shafts. Finally, in this brake, constantly traversed to a maximum by oil, there continuously results a considerable need of energy for the constantly stressed pump and the drag torques between the friction brakes, since an emergency control dependent on the brake actuation is missing.
The problem to be solved by the invention on the basis of the above is to provide a drive wheel having a friction brake in which the cooling system is improved and feeding of the coolant activatable only upon braking takes place via non-rotating, tightly attached parts of the axle housing, there being also obtained an arrangement that spares brake pressure and protects the transmission, making possible, without disassembling, an optimal cooling effect without great impairment of the transmission due to brake heat or friction and a practical disassembling of the transmission.
The solution is obtained by the fact that all feed pipes discharging in the transmission housing pass beneath the bearing of the wheel into the non-rotating axle housing and the drain from the oil ring that forms in the ring gear above the outer edge of the ring-gear carrier there immersed and the axle pipe are provided with a direction that offers good cooling possibilities. The remaining structural assembly of the wheel head provides the arrangement of the brake between planetary transmission and ring-gear carrier or bearing in a manner such that the bores in the wall of the axle pipe are sealed axially and statically, the same as reliably and free of wear, by the annular flange that serves as ring-gear carrier. By means of the compact brake system that is easy to assemble, any impairment of the transmission due to heat accumulation or friction, or of the bearing, even in case of continued braking is reliably avoided. The brake discs and the brake cylinder can also be designed more effectively and in shorter version with approximately the same external diameter as in the ring-gear carrier and also without second inner support of the planetary shaft. Besides, their dismantling without dismembering from the axle pipe end is possible without propping up the vehicle. The use for steering axles poses no problem.
Another drive wheel with attachment to a circulation cooling system has also been disclosed in EP 00 76 387. But here the brake is accommodated in an extra housing that externally surrounds the bearing and thus axially enlarges the
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Huff Martin
Kuchelmeister Ulrich L.
Lorence Richard
Zahnradfabrik Friedrichshafen AG
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