Machine element or mechanism – Gearing – Plural power paths to and/or from gearing
Patent
1991-12-10
1993-08-31
Lorence, Richard M.
Machine element or mechanism
Gearing
Plural power paths to and/or from gearing
74 154, 74 1566, 74331, 74342, 74360, F16H 3706
Patent
active
052398870
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a multi-step speed-change transmission. Transmissions of this kind are as a rule used for tractors and construction vehicles which must allow jerkless movements at low speeds under light or heavy load and frequent changes of direction, the same as relatively quick road travel for transportation purposes, etc. A summary about the working speeds of tractors most required in agriculture is found, for instance, in K. T. Renius, Traktoren, Verlagsunion Agrar, 1985, page 93.
To satisfy such different conditions of use by means that operate reliably, economize energy and are easy to service, transmissions having a wide range of ratios and many ratio steps are needed which permit an optimal use of the available tractive forces of the engine at all traveling speeds that occur.
DE-C 26 45 907 has disclosed a multi-step transmission. It essentially consists of a splitter group in the form of a finely stepped input group whose fixed gears are on an input shaft driven directly by the main drive and show gearshift clutches and idler gears are all lined up next to each other on a first countershaft and a main group operatively situated behind the input group having a drive shaft situated axially and as an extension of the first countershaft and an output shaft actuatable therewith via gearshift clutches and idler gears and fixed gears meshing therewith. Spatially between the input group and the main group an intermediate transmission is provided containing both a creeping gear set and a reverse gear set whose shift elements are situated successively on the first transmission shaft that carries the gearshift clutches of the input group. At the same time, both the secondary shaft of the reverse-gear shift clutch and the drive shaft of the main group come to lie coaxially and as an extension of the first transmission shaft.
The problem to be solved by the invention is to provide an intermediate transmission, within the speed-change transmission, by which an additional gear is made available with little effect on the gear change operations of the input and main groups.
The solution of said problem consists in providing, axially between a first housing partition on the output side of the input group and before the starting clutch, a free space for installing an intermediate transmission and mounting in this area a positive clutch, wherein said positive clutch radially covers an axial bearing between the first countershaft and the primary shaft and wherein substantially at the height of a reversing shaft there is an intermediate axle with drive-side stop in the first housing wall of the input group upon which intermediate axle is supported a double gear of the intermediate transmission which is engaged with an idler gear on the output side of the sliding sleeve.
Since sufficient space for installing a gearshift clutch is provided between the first housing partition and the starting clutch and the connection of the first countershaft and primary shaft of the starting clutch is produced by a replaceable shaft sleeve, it is possible, when needed, to provide an intermediate transmission without a basic change of construction or lengthening of the transmission or of the clutch and to design always identically all the parts needed therefor.
Even the intermediate axle in the free space with an axial bearing in the connection area and the possibility of accommodating the double gear required in the installation of the intermediate transmission can already be provided from the beginning both for axial support of the first and second housing partition and for passing over oil ducts from the main group to the input group and vice versa.
If an intermediate transmission is installed in said free space and for the shaft sleeve is substituted in combination with fixed gear and idler gear a dog clutch or synchronizer clutch with sleeve carrier on the primary shaft of the starting clutch, it is easily possible, according to the invention, to situate an intermediate ratio before the starting clutch. The weights of the mai
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patent: 4750580 (1988-06-01), Umemoto
patent: 4757726 (1988-07-01), Yamaguchi
patent: 4794807 (1989-01-01), Horii et al.
Baur Edwin
Lehle Hubert
Muller Franz
Pohlenz Jurgen
Simon Herbert
Levi Benjamin
Lorence Richard M.
Zahnradfabrik Friedrichshafen AG
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