Implements or apparatus for applying pushing or pulling force – Apparatus for hauling or hoisting load – including driven... – Device includes rotatably driven – cable contacting drum
Patent
1990-11-27
1993-10-12
Matecki, Katherine
Implements or apparatus for applying pushing or pulling force
Apparatus for hauling or hoisting load, including driven...
Device includes rotatably driven, cable contacting drum
475344, B66D 122, F16H 146
Patent
active
052518787
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a lifting equipment drive including a brake and an engine which drives, via an input shaft, a sun gear of an input planetary gear set of a multi-stage planetary transmission. A planet carrier of the input planetary gear set is fixedly connected with a sun gear of a second planetary gear set, while ring gears of the input planetary gear set and of the second planetary gear set are connected with a housing case. The latter is rotatably supported over bearings upon a stationarily held planet carrier of the second planetary gear set.
SUMMARY OF THE INVENTION
Therefore, the problem to be solved by the invention is to improve the noise emission of a lifting equipment drive of the kind descried above while preserving the favorable efficiency and yet to keep low the building cost. According to the invention, said problem is solved by the fact that the input planetary gear set is helical cut and the second planetary gear set is straight cut, that the input shaft between the sun gear of the input planetary gear set and the brake, which is placed between the engine and the planetary transmission, is divided by a clutch with longitudinal balance and the portion of the input shaft on the side of the sun gear is supported via a fixed ball bearing in the planet carrier of the second planetary gear set.
The helical cut of the input planetary gear set reduces the running noises which appear mainly in this transmission stage with high speed and small torques. As a consequence of the small torques, no great axial thrusts occur on the input shaft or on the ring gear due to the helical cut so that the axial support can be simply designed. As result of the low speed level, the second planetary gear set produces only slight running noises so that the difference between an expensive helical cut and the simpler straight cut is not of great importance from the point of view of noise. The straight cut produces no axial thrust and thus requires no special axial support.
According to an embodiment, the advantage can be further increased by the fact that only the gears of the second planetary gear set are finished by a heat treatment at high temperatures such as hardening. The input planetary gear set must at most be finished at low temperatures. Thereby appear in the input planetary gear set small distortions which without refinishing result in a higher precision and therefore smoother running. At the same time only a small production cost is needed. The second planetary gear set is straight cut. The manufacturing imprecisions in the slowly running second planetary gear set cause only a small emission of noises which can be further reduced by slight mechanical finishing.
The clutch with a longitudinal balance in the input shaft prevents vibrations from being transmitted from the drive or from the brake to the planetary transmission, and there possibly produce resonance vibrations with noise emission. Here the portion of the input shaft on the side of the sun gear is supported over a fixed ball bearing in the planet carrier of the second planetary gear set. The radial bearing play can be adapted to the needed space of movement of the sun gear. The input sun gear can, within the bearing play and due to swingings within the clutch play, freely adjust itself between the planetary gears. Thereby a good load balance with satisfactory smooth running is ensured even when the sun gear is built as one piece with the input shaft in order to obtain a great reduction ratio. The adaptability of the input sun gear is therefore of special importance, since the planet carrier of the input planetary gear set rests only axially over radial ball bearings on the planet carrier of the second planetary gear set locked on the housing, the axial bearings being conveniently under spring preload in order to prevent noises. The planet carrier of the input planetary gear set is therefore guided radially by the sun gear of the second planetary gear set and by the ring gear of the input planetary gear set and t
REFERENCES:
patent: 3160026 (1964-12-01), Rosen
patent: 3245279 (1966-04-01), Baker
patent: 3323779 (1967-06-01), Burnett
patent: 3370832 (1968-02-01), Spyridakis
patent: 3885656 (1975-05-01), Michling et al.
patent: 4106366 (1978-08-01), Altenbokum
patent: 4380274 (1983-04-01), Abraham
patent: 4391163 (1983-07-01), Benthake et al.
patent: 4408746 (1983-10-01), Marsch et al.
patent: 4736929 (1988-04-01), McMorris
patent: 4854547 (1989-08-01), Aliphant
Mann Egon
Meisinger Erwin
Matecki Katherine
Zahnradfabrik Friedrichshafen AG
LandOfFree
Drive for lifting equipment does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Drive for lifting equipment, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Drive for lifting equipment will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1899453