Bearings – Linear bearing – Ball bearing
Patent
1996-09-30
1998-01-13
Hannon, Thomas R.
Bearings
Linear bearing
Ball bearing
192 82R, 192110B, 74473R, 384 51, F16C 2904, F16D 1900
Patent
active
057071535
DESCRIPTION:
BRIEF SUMMARY
The invention concerns the arrangement of a bearing assembly for sliding selector shafts in a transmission casing, preferably for a gearshift device of a sliding multi-gear transmission comprising a rolling bearing (5) having rolls or bearing balls arranged in a cage (6) for rolling at least indirectly on a selector shaft and on an inner peripheral surface of a bushing (3) which is rigidly connected to the transmission casing (16).
Bearing assemblies of this type are normally mounted directly in a bore of the transmission casing. Due to the high switching forces caused by a relatively high friction, such a mounting arrangement influences the comfort of gearshifting. A bearing assembly of the aforesaid type known from DE-A 41 36 988, achieves a reduction of the frictional force by using a selector shaft mounted on a rolling bearing in the transmission casing. However, this prior art bearing assembly is unsuitable for selector shafts which, in addition to an already existing mounting arrangement, require a further mounting spaced in longitudinal direction from the said existing mounting. This is the case, for example, with selector shafts which are connected in the mounting regions to an actuating element such as a driver.
It is an object of the invention to create a mounting assembly for sliding shafts connected to an actuating element outside of the transmission casing, said mounting assembly causing less friction and increasing the comfort of gearshifting while at the same time requiring a small design space.
The invention achieves this object by the fact that on one end of the bushing, there is arranged a flange by which the bushing is fixed in or on the transmission casing so that an entire, or almost entire length of the bushing extends freely in the transmission casing. To create a sliding path limitation for the rolling bearing, an end stop is integrally formed on the end of the bushing remote from the flange. The rolling bearing assembly of the invention can be used as an additional mounting for the selector shaft in or on the transmission casing and can be arranged longitudinally away from the already existing mounting of the selector shaft, or it can replace the same. The bearing assembly of the invention permits a "floating" mounting of the selector shaft since this is not supported directly on the transmission casing. The mounting arrangement which extends in axial direction requires only a small radial design space and is therefore advantageously suited for use in confined installation conditions.
In one embodiment, on its side facing the transmission casing, the flange comprises a centering device. The side of the flange opposite to the centering device merges integrally into the bushing.
In a further embodiment of the invention, the flange is configured so as to bear by an even surface against the transmission casing, and centering is effected by fitting pins or screws which are used for fixing the flange.
To form an end stop for the rolling bearing in the bushing, the end of the bushing remote from the flange is shaped radially inwards without chip removal to form a step against which the rolling bearing bears by an outer ring.
In a further advantageous embodiment of the invention, the flange and the bushing are made together as a single integrally formed component which can be advantageously manufactured economically by a non-chipping procedure, particularly by deep drawing. In an alternative embodiment of the invention, the flange and the bushing are separate elements joined together undetachably, for example, by welding or soldering to form a single component.
The rolling bearing is positionally fixed and surrounds the shaft through an angle of about 180.degree.. Such a bearing is particularly suitable for stepped shafts or shaft sections which comprise recesses, for instance for engagement by driving elements.
Embodiments may concern anti-rotation devices which enable an exact positional fixing of the rolling bearing of the alcove embodiment.
In one embodiment, the cage comprises a pin w
REFERENCES:
patent: 4544212 (1985-10-01), Parzefall et al.
patent: 5140866 (1992-08-01), Schetter et al.
Steinberger Wolfgang
Winkler Manfred
Hannon Thomas R.
INA Walzlager Schaeffler KG
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