Endless belt power transmission systems or components – Pulley with belt-receiving groove formed by drive faces on... – Load responsive
Reexamination Certificate
1998-12-22
2001-01-09
Fenstermacher, David (Department: 3682)
Endless belt power transmission systems or components
Pulley with belt-receiving groove formed by drive faces on...
Load responsive
C474S028000
Reexamination Certificate
active
06171207
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a transmission, sub as a continuously variable speed cone pulley transmission.
2. Description of Related Art
A transmission typically is disposed in a motor vehicle in the power flow between a driving unit and at least one wheel, with an input shaft and an output shaft, a starting element and an element for reversing the direction of rotation and a first set of conical flanges disposed on a first shaft and having an axially fixed and an axially suitable conical flange as well as a second set of conical flanges disposed on a second shaft and baving an axially fixed and an axially suitable conical flange and a wrapping means for the transmission of torque between the first and second sets of conical flanges and, if necessary, a torque sensor, at least the axially suitable conical flanges comprising adjusting means for the application of pressure.
In the aforementioned transmissions, the supplying of a pressurized medium is ensured in bat, there are provided in the shafts of the transmission discrete axially parallel neighboring holes in the form of longitudinal bores which communicate with radially outwardly extending bores. Such parallel bores in the form of longitudinally extending holes which are provided in the shafts can be formed only at a relatively high cost.
SUMMARY TO THE INVENTION
An object underlying the present invention was to provide a transmission of the above outlined character which can be produced in a relatively simple manner as concerns its construction and manufacturing cost. Furthermore, conventional transmissions should be improved.
In accordance with the invention, this is accomplished in that, for the purpose of supplying pressurized medium to at least one of the adjusting means, at least one of the shafts is provided with a cavity extending along a portion of the axial length of the shaft, this cavity receiving a hollow tube which is provided with axially extending webs dividing the cross section of the tube into various chambers which extend in the axial direction.
It is of particular advantage if the adjusting means can receive pressurized medium by way of substantially radially extending bores provided in the at least one shaft and extending through the wall of the hollow tube.
It is equally advantageous if the hollow tube is subdivided into at least two chambers by at least one web which extends in the axial direction. In accordance with an advantageous embodiment of the invention, there are provided two, in another embodiment three, in a further embodiment four, and furthermore in an additional embodiment five or more chambers which are arranged essentially parallel to each other in the axial direction and are separated from each other by webs. In this connection, it can be of advantage if the webs extend radially outwardly from the central point or from the axis of the shaft and, if necessary, meet and sealingly engage and, if necessary, are connected to each other at the center. It is desirable that the radially outer portions of the webs be sealingly connected to the hollow tube.
Furthermore, in accordance with an additional embodiment of the invention, it may be desirable if the hollow tube is non-rotatably connected to the shaft and at least one of its axial end portions is rotatably journalled relative to an element which is secured to the housing.
It is equally advantageous if the at least one axial end portion of the hollow tube is provided with a connection which is essentially fluidtight when the hollow tube and the element which is affixed to the housing rotate relative to each other.
Furthermore, it is of advantage if the hollow tube is mounted against rotation relative to the housing and the shaft is journalled for rotation relative to the hollow tube.
In accordance with a further embodiment, it is equally of advantage if the peripheral coat of the hollow tube is provided with at least some regions which are sealed by seals and which are in fluid-conveying communication with discrete channels of the hollow tube by way of bores.
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Ehrlich Matthias
Eidloth Rainer
Darby & Darby
Fenstermacher David
LuK Getriebe-Systeme GmbH
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