Abstract: A piston hydraulic device comprises a cylinder block having a plurality of cylinder assemblies and is rotatable about a first rotation axis. Each cylinder assembly comprises a cylinder and a piston. A port plate has a first port and a second port that are angularly spaced relative to the first rotation axis. A plurality of first conduits connect respective cylinders alternately to the first port or the second port. At least one second conduit is connected to a fluid reservoir. At least one directional control valve is positioned in the first conduit and fluidly connects to the second conduit. The at least one directional control valve connects the cylinder to the port plate in a first position and to the fluid reservoir in a second position. A controller is operatively associated with the directional control valve for switching between the first and the second positions.

Abstract: Methods and systems for a bent axis motor are described. In one example, a bent axis motor includes a valve plate coupled to at least one piston of a cylinder block, the valve plate comprising a first plurality of grooves spaced about openings of the valve plate on a first side of the valve plate facing the cylinder block, the valve plate further comprising a second plurality of grooves arranged on a second side of the valve plate facing away from the cylinder block.

Abstract: Hydraulic systems and methods comprising a source of hydraulic pressure; a hydraulic load; and an energy recovery circuit. The source of hydraulic pressure is fluidly connected to the hydraulic load through a first hydraulic channel with an orifice. The energy recovery circuit includes a recovery channel which is fluidly connected at its first end to the orifice on the side of it which is connected to the source of hydraulic pressure, and which is fluidly connected at its second end to a hydraulic motor.

Abstract: A hydraulic control system for control of a hydraulic motor. The hydraulic control system comprises a fluid distribution assembly having a tank, a pump to pump fluid from the tank and a directional valve for distributing pressurised fluid from the pump and to return fluid to the tank; a valve assembly fluidly connected to the directional valve, the valve assembly having a first overcenter valve and a pressure reducing valve wherein a first main line connects the directional valve to the first overcenter valve and wherein a shuttle line connects the pressure reducing valve to the first main line; a hydraulic motor fluidly connected to the valve assembly wherein the first main line connects the hydraulic motor to the first overcenter valve; and a brake assembly fluidly connected to the pressure reducing valve, wherein a drain line connects the pressure reducing valve to the hydraulic motor.

Abstract: A hydrostatic drive system for vehicles may have a hydrostatic transmission unit with a hydraulic motor provided with a containment body and a drive shaft rotationally supported around a primary axis inside of the containment body. The system may also have an axle with a housing case for a differential device for the transmission of the drive torque to two half-axles and rotating around a secondary axis transverse to the primary axis. The differential device may also have a toothed conical drive ring gear in rotation about the secondary axis. The coupling member may be a conical pinion rigidly associated in rotation about the primary axis with the drive shaft and directly geared with the ring gear, the pinion being positioned along the terminal section of the drive shaft.

Abstract: The present invention relates to a piston for hydraulic machines with axial positions, comprising a head connected to a stem which is extended along a longitudinal axis and forms a bottom arranged at the opposite end with respect to said head. The piston is further provided with at least one intake duct passing within it and having a first and a second end, which are mutually opposite, open respectively at the head and at the bottom. The distinctive aspect of the invention is that the piston also comprises at least one distribution duct passing within it, which has a first and a second end, which are mutually opposite, the first end of which is in fluid communication with the intake duct and the second end of which is open at the head, the piston being provided monolithically.

Abstract: Hydraulic systems and methods comprising a source of hydraulic pressure; a hydraulic load; and an energy recovery circuit. The source of hydraulic pressure is fluidly connected to the hydraulic load through a first hydraulic channel with an orifice. The energy recovery circuit includes a recovery channel which is fluidly connected at its first end to the orifice on the side of it which is connected to the source of hydraulic pressure, and which is fluidly connected at its second end to a hydraulic motor.

Abstract: A piston hydraulic device comprises a cylinder block having a plurality of cylinder assemblies and is rotatable about a first rotation axis. Each cylinder assembly comprises a cylinder and a piston. A port plate has a first port and a second port that are angularly spaced relative to the first rotation axis. A plurality of first conduits connect respective cylinders alternately to the first port or the second port. At least one second conduit is connected to a fluid reservoir. At least one directional control valve is positioned in the first conduit and fluidly connects to the second conduit. The at least one directional control valve connects the cylinder to the port plate in a first position and to the fluid reservoir in a second position. A controller is operatively associated with the directional control valve for switching between the first and the second positions.

Abstract: A hydraulic control system for control of a hydraulic motor. The hydraulic control system comprises a fluid distribution assembly having a tank, a pump to pump fluid from the tank and a directional valve for distributing pressurised fluid from the pump and to return fluid to the tank; a valve assembly fluidly connected to the directional valve, the valve assembly having a first overcenter valve and a pressure reducing valve wherein a first main line connects the directional valve to the first overcenter valve and wherein a shuttle line connects the pressure reducing valve to the first main line; a hydraulic motor fluidly connected to the valve assembly wherein the first main line connects the hydraulic motor to the first overcenter valve; and a brake assembly fluidly connected to the pressure reducing valve, wherein a drain line connects the pressure reducing valve to the hydraulic motor.

Abstract: A bent-axis axial-piston hydraulic machine may have a cylinder block being movable circumferentially about a first rotation axis. The machine may also have a transmission shaft which is functionally associated with the cylinder block and which can rotate about a transmission axis incident on the rotation axis. The machine may also have a distributor, and a device for angular offsetting which is associated with the distributor to rotate the distributor to cause a variation of effective cubic capacity while a geometric cubic capacity of the machine remains constant. The corresponding method for adjusting the capacity of a bent-axis axial piston hydraulic machine is also disclosed.

Abstract: The present invention relates to a piston for hydraulic machines with axial positions, comprising a head connected to a stem which is extended along a longitudinal axis and forms a bottom arranged at the opposite end with respect to said head. The piston is further provided with at least one intake duct passing within it and having a first and a second end, which are mutually opposite, open respectively at the head and at the bottom. The distinctive aspect of the invention is that the piston also comprises at least one distribution duct passing within it, which has a first and a second end, which are mutually opposite, the first end of which is in fluid communication with the intake duct and the second end of which is open at the head, the piston being provided monolithically.