Borgwarner Torqtransfer Systems Ab

Borgwarner Sweden Ab

Johan Nilsson

Lars Severinsson

Hans Aulin

Mikael Tiainen

Kristoffer Nilsson

Gustaf Lagunoff

Bo Lundstrom

Henrik Nilsson

Magnus Persson

Daniel Herven

Peter Dahlstrom

Peter DAHLSTRÖM

A coupling for an AWD vehicle comprises a disc package with alternate discs, which are connected for rotation with, but are axially movable in relation to an ingoing and an outgoing axle, respectively, of the coupling, and a hydraulic piston for pressing the disc package together under the action of hydraulic pressure, hereby establishing a connect mode, in which the ingoing axle is connected to the outgoing axle. A coupling slack adjuster is provided for mechanically establishing a rest position for the hydraulic piston in a disconnect mode, in which a predetermined slack in the disc package is established, irrespective of the wear of the discs.

Coupling for an AWD vehicle

A method of controlling a drive train comprising an electric motor (), a gearbox () and an internal combustion engine (). The gearbox () is placed between the electric motor () and the internal combustion engine () in the drive train. The speed of the electric motor () is synchronized to the speed of the internal combustion engine () in order to shift the gearbox. The gearbox () is shifted between different operation modes by means of controlling the position of a dog clutch ().

Method of controlling a drive train

A gearbox () is placed in a drive train between an electric motor () and an engine () of a vehicle. The gearbox () is placed in direct connection to an output shaft () of the electric motor (). The gear box () has means to place it in three different modes.

Gearbox

A hydraulic system () for a vehicle is provided. The hydraulic system comprises a shifting mechanism () and a pump assembly () configured to provide pressurized fluid to said shifting mechanism (), and an electrical motor (). The movement of the shifting mechanism () controls a valve function which serves to open a connection from the pump assembly () to the electrical motor ().

Hydraulic system

A coupling for an AWD vehicle comprises a disc package with alternate discs (), which are connected for rotation with, but are axially movable in relation to an ingoing () and an outgoing axle (), respectively, of the coupling, and a hydraulic piston () for pressing the disc package together under the action of hydraulic pressure, hereby establishing a connect mode, in which the ingoing axle is connected to the outgoing axle. A coupling slack adjuster (--) is provided for mechanically establishing a rest position for the hydraulic piston () in a disconnect mode, in which a predetermined slack in the disc package is established, irrespective of the wear of the discs.

A disconnected, hydraulic disc coupling () in an AWD vehicle with a hydraulic cylinder () for its actuation is to be quickly connected or engaged. The effective piston area in the cylinder () is for that reason reduced during the connection phase.

Method for operating a hydraulic disc coupling in an AWD vehicle and a coupling therefore

One embodiment may include a system for distributing torque between front and rear axles of an all wheel drive vehicle and/or between left and right wheels of a two or four wheel drive vehicle comprises at least one limited slip coupling having a disc package and a piston acting thereon, the piston being actuated by a hydraulic pump assembly. This assembly has an electric motor, a hydraulic pump driven thereby, and a centrifugal regulator also driven thereby, the centrifugal regulator controlling a pressure overflow valve, connected to the oil outlet of the hydraulic pump. The assembly specifically comprises an axial piston pump having a piston drum rotatable in a pump housing and containing a number of reciprocable axial pistons, at least one centrifugal lever pivotally attached to the piston drum, and a valve member connected to the centrifugal lever and being arranged for cooperation with the mouth of an oil outlet bore in the piston drum to form the pressure overflow valve.

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Huskvarna, Sweden

Johan Nilsson