Parker-hannifin Corporation

Kinetics Drive Solutions Inc.

Silvatech Global Systems Inc.

John Czepak

Dayao Chen

Gerald Dyck

Per-Ola Vallebrant

Paul Dries

Ron Scheper

Francesco Michele Caldarella

Dayao Alex Chen

Stefan Haellgren

Stig Ingemar Bratt

Mohsen Bagherpour

Mikael Karlsson

Benjamin Starkey

Stig Bratt

Robert Amnerud

Francesco Caldarella

Stefan HÄLLGREN

Stefan Hallgren

A hydrostatic drive system is disclosed which allows for simpler and more robust control of hydraulic vibration. The system comprises first and second hydraulic drive units and a variable damping device. At least the first hydraulic drive unit is a variable displacement type and comprises a displacement control. The variable damping device comprises at least one variable element. The system comprises a first linkage apparatus between the displacement control and the variable element and is operable to control the variable element in accordance with the displacement of the displacement control.

Hydrostatic drive system with variable vibration damper

A hydrostatic assembly employing a 1hydraulic piston drive unit is described in which the output is increased without using additional servo assemblies by incorporating a 2hydraulic piston drive unit, coupling the drive shafts of both drive units together, and employing a common means to simultaneously adjust displacement of both the 1and 2hydraulic piston drive units. In such embodiments, coupling the drive shafts together such that the 1hydraulic piston drive unit is rotationally offset with respect to the 2hydraulic piston drive allows for a reduction in the amplitude of pressure pulsations associated with the hydrostatic assembly output, thereby smoothing out operation and improving durability.

Hydrostatic assembly

A hydrostatic variator having a common yoke design and two or more bent axis piston drive units is disclosed in which the rotating group of a drive unit is arranged to be movable relative to the yoke to alter the angle between its drive shaft axis and rotating group axis independent of the other drive unit. This can be accomplished using movable sector plates coupled to the rotating groups that are arcuately movable within the yoke about the axis perpendicular to the respective drive shaft axes of the drive units. Such variators enjoy the response and packaging advantages of a common yoke design while still allowing dynamic adjustment of system size. In turn, varying system size allows for efficiency to be improved at conditions other than at the maximum design torque.

Hydrostatic variator

A hydraulic machine includes a support structure and a rotating group rotatably mounted relative to the support structure. The rotating group includes a shaft and a cylinder barrel with a plurality of circumferentially spaced cylinder bores. Reciprocal pistons extend from the shaft with each one of the pistons extending into an associated one of the cylinder bores. A joining assembly joins the shaft and the cylinder barrel so that the shaft and the cylinder barrel rotate together. The hydraulic machine further includes at least one oil dam associated with the rotating group and adapted to trap hydraulic fluid used for lubricating portions of the joining assembly.

Hydraulic machine with oil dams

A hydrostatic assembly includes a pump having a yoke and an associated rotating group. The pump yoke has a bucket portion and an arm portion. At least one fluid passage extends through the pump yoke. The hydrostatic assembly also includes a motor having a yoke and an associated rotating group. The motor yoke also has a bucket portion and an arm portion. At least one fluid passage extends through the motor yoke. The arm portion of the pump yoke and the arm portion of the motor yoke have associated coupling portions for fluidly coupling the pump yoke to the motor yoke so that the at least one fluid passage in the pump yoke is in direct fluid communication with the at least one fluid passage in the motor yoke.

Hydrostatic assembly having coupled yokes

The invention comprises an electro-mechanical continuously variable transmission (EMCVT) that uses a planetary gear system to provide a combination of electric and mechanical power for a vehicle or for stationary equipment. The EMCVT includes a clutch and brake system that allows power from a energy storage unit to be combined with the main power input (typically an engine) to provide a torque output greater than that available from the main power input alone.

Electro-mechanical continuously variable transmission

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Burnaby, Canada

John Czepak