Machine element or mechanism – Elements – Gear casings
Patent
1986-07-11
1989-01-10
Moore, Richard E.
Machine element or mechanism
Elements
Gear casings
295251, 180 67, 184 612, F16H 5702
Patent
active
047964863
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a gear mechanism for full-track vehicles according to the preamble of the main claim.
DE-OS 29 20 820 has disclosed such a gear mechanism wherein several sub-assemblies, partly prefabricated, are combined to form a gear mechanism mainly for the purpose of improving the manufacture and installation. Said modern construction has proved satisfactory and has led to considerable improvements in those relatively complicated gear mechanisms in which in addition to the transmission and adaptation of the drive engine to the chain drive there are also arranged a reversing and steering gear, the same as a converter, and often, as is to be seen in the above-cited publication, also a flow brake and an auxiliary power takeoff.
The housing of such a gear mechanism in which and on which the separate subassemblies must be installed is very complicated structural part due to the fastening of the subassemblies and their connections with the housing with regard to drive and fluid. It is necessary to manufacture a large number of mating surfaces, supports and connections coordinated with each other with a great precision so that all the solid connections for drive and fluid of the subassemblies with the housing ensure a perfect installation and the operation of the whole gear mechanism. This makes necessary a great expense in manufacture and control for the subassemblies and specially for the housing.
Therefore, the problem to be solved by the invention is further to develop a gear mechanism and to simplify it in relation to manufacture and installation expenses.
While according to the prior art in such a gear mechanism it is the housing part that is most complicated and causes the heaviest expenses in manufacture and control, according to the invention, the cast preparation and above all the final machining and the control expenses are considerably reduced, since the number of bores and mating surfaces is greatly diminished and the maintenance and controls of the necessary tolerances for a very great part of the processed surfaces cause less difficulties due to their small dimension. The elimination of all supports of the subassemblies in the housing for the operative connections and the flexible connections of the hydraulic, electric and operative coupling points between the subassemblies greatly simplify the production and installation.
The fixing of the subassemblies within the carrier-like housing by bearing, centering and fastening elements makes possible, togther with the reduction of the surfaces to be machined, large free spaces for the functionally best arrangement of said subassemblies. The bearing lugs, centering and fastening means arranged centrally with each other are in principle identically shaped and only the bearing lugs are adapted to the corresponding subassembly and to the gear housing. If the bearing lugs are situated in the gear housing staggered in peripheral direction for two subassemblies adjacently disposed in axial direction, there result favorable free spaces for the installation, and the arrangement of the bearing lugs can in principle result in the smallest diameter without there arising difficulties of installation.
If the bearing, centering and fastening elements are then also arranged staggered in axial direction, that is, the bearing lugs are not in an axial plane, there additionally result possibilities of improvement relative to the whole construction space so that the housing can be kept smaller and thus there results a reduction of the surfaces to be machined.
Since there are needed in the housing only apertures and passages for stub shafts by which the subassemblies disposed coaxially to each other are connected, the production cost is substantially less. The axially staggered arrangement of the subassemblies in respect to each other and their operative connection via toothed wheels, as result of the large free spaces in the housing, must be easily implemented doing justice to operation and manufacture, specially since the tooth meshing on the coupling points is d
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Binger Bernhard
Eickhoff Hans J.
Engstler Anton
Grolig Herbert
Maier Paul
Lindsey Rodney M.
Moore Richard E.
Zahnradfabrik Friedrichshafen AG
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