Abstract:
The shuttle action evaluating unit determines that the vehicle is in a shuttle action when the direction relative to the position of the forward/reverse travel operating member differs from the travel direction of the vehicle. The target input shaft torque determination unit determines a target input shaft torque. The target output shaft torque determination unit determines a target output shaft torque so that a deceleration force for decelerating the vehicle is generated on the output shaft of the power transmission device in a state in which connection and disconnection states of the forward travel clutch and the reverse travel clutch are maintained at the state before the start of the shuttle action when the shuttle action is started. The torque-balance information is stored in a storage unit and defines a relationship between the target input shaft torque and the target output shaft torque so as to achieve a balance of the torques of a power transmission device. The command torque determination unit uses the torque-balance information to determine torque commands to the motor from the target input shaft torque and the target output shaft torque.
Abstract:
An actuator assembly (100), the actuator assembly (100) including : - a first actuator (5), the first actuator (5) comprising an actuator housing (51), a piston (53) in the actuator housing (51) and an actuator rod (53); and - a hydraulic unit (300), and the actuator assembly (100) further including : - a second actuator (5'), the second actuator (5') comprising an actuator housing (51'), a piston (53') in the actuator housing (51') and an actuator rod (53'); and - the piston side of the first actuator (5) facing the piston side of the second actuator (5'), and the actuator rods (53, 53') being coaxial.
Abstract:
A hybrid swing drive system (1) of a hydraulic construction machine includes a variable displacement hydraulic swing pump (3) operable by a prime mover (2); a hydraulic swing motor (16) for performing a swing function of the machine; an accumulator (10); a controller (244); a swing control valve assembly (15) disposed in a first hydraulic path extending from the swing pump to the swing motor, the swing control valve assembly having a first position fluidly connecting the swing pump to a first side of the swing motor and a second position fluidly connecting the swing pump to a second side of the swing motor; and an accumulator control valve (12) having an open position fluidly connecting the accumulator to the first hydraulic path at an accumulator control valve connection point and a closed position fluidly isolating the accumulator from the first hydraulic path.
Abstract:
A pressure supply device in accordance to one or more aspects includes an elongated body having an internal bore extending from a power end to a discharge end having a discharge port, two or more gas generators connected to the power end and a hydraulic fluid disposed in the bore between a piston and the discharge end. The ignition of one of the gas generators drives the piston to exhaust a partial volume of the hydraulic fluid that is less than the total operational volume of the hydraulic fluid under pressure to operate at a connected device.
Abstract:
A shovel according to an embodiment of the present invention includes a main pump (14), a hydraulic actuator (1A, 1B, 7, 8, 9, 21) configured to be driven with hydraulic oil discharged by the main pump (14), and an accumulator part (41) configured to store the hydraulic oil discharged from the hydraulic actuator (1A, 1B, 7, 8, 9, 21) and capable of discharging the hydraulic oil to an intake side of the main pump (14).
Abstract:
Flurförderzeug mit einem Antriebsteil (10) und einem relativ zu dem Antriebsteil (10) höhenverstellbaren Lastteil (12) mit zwei Radarmen (26), wobei jeder der Radarme (26) folgendes aufweist: • einen Radarmhebel (28), der mindestens eine Lastrolle (30) aufweist und schwenkbar an dem Radarm (26) angelenkt ist, und • eine Stange, über die eine Höhenverstellbewegung des Lastteils (12) mit einer Schwenkbewegung des Radarmhebels (28) gekoppelt ist, wobei die Stange einen Hydraulikzylinder (36) aufweist, mit dem eine Länge der Stange verstellbar ist und der ein Arbeitsvolumen (38) aufweist, wobei • die beiden Stangen Druckstangen (34) sind und • das Flurförderzeug einen Druckspeicher (52) aufweist, der mit den Arbeitsvolumina (38) der beiden Hydraulikzylinder (36) verbindbar ist.
Abstract:
A pressure amplifier (1) is described comprising a housing (2), an amplification piston (5) in the housing (2) having a high pressure area (9) in a high pressure chamber (5) and a low pressure area (8) in a low pressure chamber (3), and a switching valve (11) having a pressured control valve element having a larger pressure area (16) and a small pressure area (17). Such a pressure amplifier should have a high operating frequency. To this end the valve element (10) and the amplification piston (5) are located in a same bore (3, 4) in the housing (2).
Abstract:
A hydraulic charging and driving system (4), aircraft employing the same, and corresponding methods, for extending and retracting a hydraulic actuator (2), comprising: a motor assembly (22); and an accumulator assembly (20), the motor assembly (22) and the accumulator assembly (20) being hydraulically coupled to each other; wherein the motor assembly (22) is arranged to recharge the accumulator assembly (20) with hydraulic fluid at a relatively slow rate that is slower than the rate at which the accumulator assembly (20) is arranged to discharge when actuating the hydraulic actuator (2). The system may further comprise a selector valve (24). The accumulator assembly (20) may comprise an accumulator chamber (30), and a compression means (32) provided within the accumulator chamber (30). The motor assembly (22) may comprise a motor (42) arranged to vary a volume of a hydraulic charging chamber (38) of the motor assembly (22).
Abstract:
A hydraulic module designed to be mounted on a hydraulic hybrid vehicle, characterised in that it forms a rigid and compact assembly comprising a body (32) receiving the high- and low-pressure accumulators intended to supply traction motors of the vehicle, comprising a generally parallelepipedal shape, and having attachment means designed to be fixed under a floor at the rear of the vehicle.
Abstract:
The hydraulic circuit has: main pumps driven by an engine; a boom cylinder including a piston operating by hydraulic oil supplied from the main pumps, one chamber and the other chamber respectively partitioned and formed by the piston; an accumulator accumulating pressure of the hydraulic oil extruded from one chamber of the boom cylinder; and an assist pump motor suctioning the hydraulic oil from the accumulator when pressure continues to be accumulated in the accumulator and the accumulator pressure rises.