A dual mode continuously variable transmission for use with motor vehicles includes a transmission input shaft, a transmission output shaft, and a variator disposed between the transmission input shaft and the transmission output shaft. A mixer gear set is operably disposed between the transmission input shaft and the variator output shaft. A clutching element is operably disposed between the input shaft the mixer gear set. The variator is configured to continuously vary a ratio of input torque to output torque between the variator shafts responsive to commands from an electronic control unit. The variator input shaft is drivingly connected to the input shaft and the variator output shaft is drivingly connected to the output shaft. The clutching element selectively connects and disconnects the input shaft and the mixer gear set to operate the transmission in a power splitting mode of operation and a variator only mode of operation. An electronic control unit incorporates logic rules by which the clutching element maintains the transmission in a variator-only mode of operation in a first vehicle speed range, and maintains the transmission in a power splitting mode of operation in a second vehicle speed range greater than the first vehicle speed range.

Continuously variable dual mode transmission

A hydraulic circuit, particularly any for an automated twin clutch transmission for motor vehicles, including a countershaft with two parallel power transmission branches, two clutches, a high pressure circuit having at least one actuator for the countershaft transmission and/or the clutches, a low pressure circuit for lubrication and/or cooling of elements of the twin clutch transmission, and a first adjustment pump for the high pressure circuit. The low pressure circuit includes a plurality of secondary pumps which are connected in parallel to the first adjustment pump.

Hydraulic circuit for an automated twin clutch transmission for motor vehicles

A barb clamp is provided for fluid liquid or gaseous connection to a flexible tube, the flexible tube having an inner bore defined by a predetermined inner diameter for providing a fluid flow path. The barb clamp includes a barb connector having the same predetermined inner diameter as the flexible tube and a tapered end insertable into the tube. A sleeve and collet lock over the tubing and barb connector to prevent liquid material entering between the barb and tube. The tapered end of the barb connector terminates at a point so that there is no transition between the inner diameter of the tube and the inner diameter of the barb connector to provide no pressure differential in the tube between the outside and inside of the barb clamp.

Barb clamp with smooth bore

A continuously variable transmission and method for preventing transmission belt slippage in the case of a sudden change in load torque on the transmission involve one or both of inserting a lag in the transmission with a torsional spring damper or elastomer damper device between the device to be driven and an output shaft of the secondary pulley of the transmission, and inserting a lag in a hydraulic pressure control loop of the transmission compensating for a difference between the rate of torque transmission between the device to be driven and the transmission, and a response rate of the hydraulic pressure control loop to a sudden change in load torque The transmission is used to drive an aircraft electrical generator at a constant speed in the disclosed embodiment

Continuously variable transmission with control arrangement and method for reducing impact of shock load

In the hydraulic control device a pressure-reducing valve (MF) is used to produce the belt-tightening pressure for the two pairs of disks (SSA, SSB) of a cone-pulley transmission, while the function of shifting the transmission ratio is performed by a ratio-shifting valve device (DBV 1 3) that adds pressure fluid to one and simultaneously removes pressure fluid from the other of the pairs of conical disks. The pressure-reducing valve and the ratio-shifting valve device work in a cascade arrangement where the assurance of a sufficient belt-tightening pressure takes precedence over the ratio-shifting function.

Control device for continuously variable transmissions

A torque transmitting power train for use in a motor vehicle employs a transmission with two adjustable pulleys and an endless flexible element trained over the pulleys. The pulleys are adjustable by a torque sensor and primary hydraulic adjusting units in dependency upon the magnitude of transmitted torque, as well as by an adjustable selecting valve and secondary hydraulic adjusting units in dependency upon the desired or required transmission ratio. The primary and secondary adjusting units can receive a pressurized hydraulic fluid from a common source.

Friedmann Oswald

Papers

Power train with infinitely variable ratio transmission

Aandrijfeenheid met een kegelschijf-omspannings-overbrenging.

Unite d'entrainement, notamment pour vehicules automobiles

Groupe d'entrainement avec transmission a disques coniques

Power train with variable speed ratio transmission