US 5,217,412 AGranted

Continuously variable speed transmission

AssigneeLuk Lamellen und Kupplungsbau GmbH

InventorsNorbert Indlekofer, Oswald Friedmann

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Abstract

A continuously variable speed transmission wherein an input member is driven by an engine through a torque sensor and the input member drives an output member at a selected RPM through a pair of adjustable sheaves and an endless belt or chain which is trained over the sheaves. Each sheave has a fixed flange and an axially movable flange. The movable flanges can be shifted by hydraulic motors, and the pressure of fluid in such motors is determined by torque which is detected by the sensor as well as by the selected ratio of the transmission. The device which controls the pressure of fluid in the motors in dependency on the magnitude of torque and in dependency on the selected transmission ratio employs a pressure regulating valve which is connected with the torque sensor and with the motors and which is adjustable in automatic response to variations of transmission ratio.

Claims15

Dependent claims

A continuously variable speed transmission comprising a first rotary sheave arranged to receive torque from a prime mover;

a second rotary sheave arranged to transmit torque to an output member;
an endless flexible torque transmitting element trained over said sheaves, each of said sheaves comprising a first flange and a second flange movable toward and away from the respective first flange;
actuating means including a fluid operated motor for moving at least one of said second flanges relative to the respective first flange;
means for selecting the ratio of the transmission;
and means for operating said motor including a torque sensor interposed between the prime mover and the output member, and means for controlling said motor as a function of selected transmission ratio and as a function of sensed torque including means for modifying the pressure of fluid in said motor as a function of selected transmission ratio and as a function of sensed torque.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/830,182Filed 31 Jan 1992
Priority: DE 403347920 Oct 1990
Granted: 8 Jun 1993
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

B60W 30/18
Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of…:…
B60W 10/02
Conjoint control of vehicle sub-units of different type or different function: including control of driveline clutches
B60W 10/10
Conjoint control of vehicle sub-units of different type or different function: including control of change-speed gearings
B60W 30/1819
Propelling the vehicle: propulsion control with control means using analogue circuits, relays or mechanical links