192 clutches and power-stop control – Vortex-flow drive and clutch – With brake
Patent
1985-10-04
1987-05-19
Krizmanich, George H.
192 clutches and power-stop control
Vortex-flow drive and clutch
With brake
192 4C, 74475, B60K 4126
Patent
active
046660232
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application as a national phase application corresponding to PCT/EP85/00069 filed Feb. 26, 1985 and based, in turn, upon Europatent application EP84/00081 filed Mar. 17, 1984 under the Patent Cooperation Treaty and the International Convention.
FIELD OF THE INVENTION
The invention relates to a shifting arrangement and, more particularly, to a shifting arrangement for a gear transmission, particularly for agricultural vehicles, having a shift finger and an entraining member on a gear shift lever shaft whose return motion shifts the reversing transmission, whose axial displacement shifts the range change transmission and whose shifting finger also actuates upon rotation of the shaft a parking lock.
Such a shifting arrangement is known (German Patent No. 21 28 172). It consists of a manual shift lever for shifting the reversing gear as well as the range-change gear. The manual shifting lever is built with two lever arms and is linked with its second lever arm to a gear-shift-lever shaft so that it rotates the same and displaces it in axial direction. A shift finger fastened to the gear-shift-lever shaft engages with a groove of a cam fastened on a first gearshift bar. On the gearshift bar, a shift fork for the shifting of the reversing gears is mounted. The gear-shift-lever shaft also carries a gearshift sleeve which is axially rigid but rotatable with respect thereto and rotationally rigid but axially shiftable with respect to the gearbox, this gearshift sleeve having a diagonal guide for a first lever arm of a double-armed coupling lever, whose second lever arm engages into a groove of the second gearshift bar. On this gearshift bar, a shift fork for the shifting of the range-change transmission is fastened.
A shifting arrangement according to German Patent No. 21 28 172 is sufficient for a small, jaw-clutch type transmission. In such a transmission one usually accepts the rattling noises and possible stalling of the vehicle during shifting. In such a transmission however the shifting forces and shifting paths are so reduced that a purely mechanical shifting is possible still only through actuation of the manual clutch in a chosen direction, perpendicular to the shiting direction, or the longitudinal direction of the vehicle.
But when in the case of vehicles with considerably higher drive power rapid, safe shifting arrangements without the possibility of stalling are required and because of that all the shiftings are at least synchronized, only one of the two auxiliary transmissions shiftable with the same manual clutch, for instance the reversing transmission, is easily shiftable because it hwas a small rotational mass to be synchronized, while the second auxiliary transmission, for instance the range-change transmission can be shifted only with difficulty due to its considerable rotational mass and in these cases a shifting arrangement according to German Patent No. 21 28 172 is not practical.
OBJECT OF THE INVENTION
The invention has as its object to provide an improved shifting arrangement so that even in the afore-mentioned difficult conditions--i.e. for fully synchronized transmission for high drive power by the transmission group which is normally difficult to shift--the shifting forces and the shifting paths at the common manual clutch remain small or can even be reduced and, moreover, with the same manual clutch a device for locking in transmission parking position can be actuated by purely mechanical means.
This object is attained, in accordance with the invention by providing a shift finger on the entraining member fixed to the gear-shift-lever shaft with means guiding the shift finger in two immediately adjacent shift paths in which the shift fork of the reversing transmission can be actuated and a third shifting path in which an entraining element for the parking lock is actuated. The entraining element has a cylindrical control surface concentric with the gear-shift-lever shaft and formed with an axial control groove in which an actuator for
REFERENCES:
patent: 4275612 (1981-06-01), Silvester
patent: 4296642 (1981-10-01), Schetter
patent: 4476740 (1984-10-01), Ida et al.
patent: 4494419 (1985-01-01), Inui et al.
Achberger Gottfried
Angele Eugen
Dubno Herbert
Krizmanich George H.
Ross Karl F.
Zahnradfabrik Friedrichshafen AG
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