Endless belt power transmission systems or components – Pulley with belt-receiving groove formed by drive faces on...
Patent
1998-09-14
2000-11-14
Bucci, David A.
Endless belt power transmission systems or components
Pulley with belt-receiving groove formed by drive faces on...
474 70, 474 80, F16H 5556, F16H 900, F16H 5900
Patent
active
061462942
DESCRIPTION:
BRIEF SUMMARY
Several variations of continuously variable transmissions are known. With respect to belt transmission should be systems belt, preferably a push belt or a V belt or a chain, preferably a tension chain, is arranged between a drive end connected to the vehicle and an output end connected to the wheels of the vehicle. The drive end and the output end each generally have an axially displaceable V-pulley. Such systems are described, for example, in European Published Patent Application No. 451,887 and German Published Patent Application No. 44 11 628. The efficiency of such a transmission depends to a significant extent on the dimensioning of the force of the pulleys acting against the belt element so that slippage between the pulleys and the belt element is reliably prevented. This force can be dimensioned with a certain safety margin based on the largest torque to be transmitted. However, during a normal operation of the vehicle, i.e., at lower transmission torques, this generates excessively high friction forces and hydraulic losses in the gear.
One possibility of improving this situation is to adapt this force to the instantaneous transmission torque. Therefore, in European Published Patent Application No. 451,887, this force is controlled as a function of engine torque. Another possibility is to reduce this force to a level that is just sufficient to reliably prevent slipping at the prevailing transmission torque. Drive slip control is described, for example, in the German Published Patent Application No. 44 11 628. The most accurate possible knowledge of the instantaneous slip is required for such a drive slip control. It is therefore proposed in German Published Patent Application No. 44 11 628 that the speed of the belt element be detected.
ADVANTAGES OF THE INVENTION
An object of the present invention is to detect a slip in a simple accurate manner. As mentioned above, the present invention relates to a belt transmission with an adjustable transmission ratio, having a drive end and an output end. The belt means establishes an operative mechanical connection between the drive end and the output end, with the slip behavior of the connection being subject to influence, an influencing means is provided to influence the slip of the belt means.
In the present invention at least two sensor units are provided and are arranged in the area of the belt means, between the drive end and the output end. The signals of these sensor units are then sent according to the present invention to the influencing means for influencing the slip of the belt means. Due to the sensor units arranged according to the present invention, it is possible to easily determine the actual slip to a high degree of accuracy and to use it to influence the slip.
It is especially advantageous to arrange the sensor units in such a way that the sensor units detect changes in relative position between the belt means and the sensor units.
It is also advantageous that the belt means are subdivided into individual segments which move past the sensor units for establishing the operative mechanical connection between the drive end and the output end. The sensor units are then arranged so that their signals represent the segments moving past the sensor units.
As mentioned previously, the drive end and/or the output end have at least one axially displaceable element having essentially the form of a V-pulley. As the belt means, at least one belt, preferably a push belt, or a belt or chain may be stretched between pulleys representing the drive end and the output end, where the slip between the belt means and the pair of pulleys around which the belt means are wrapped can be influenced.
It is especially advantageous if one of the sensor units is arranged so that its signals represent the segments moving toward the drive end or the output end, while the other sensor units are arranged so that their signals represent the segments moving away from the drive end or output end.
The influencing means are advantageously designed so that a geometric transmissio
REFERENCES:
patent: 3543597 (1970-12-01), Schamphelaere et al.
patent: 4061222 (1977-12-01), Rushing
patent: 4557372 (1985-12-01), Rajagopal
patent: 4959040 (1990-09-01), Gardner et al.
patent: 5098345 (1992-03-01), Van Vuuren
patent: 5173084 (1992-12-01), Lemieux
patent: 5213548 (1993-05-01), Colbert et al.
patent: 5328412 (1994-07-01), Durum
patent: 5518457 (1996-05-01), Seki et al.
patent: 5662538 (1997-09-01), Wang
Bucci David A.
Kaness Matthew A.
Robert & Bosch GmbH
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