Abstract: A hydraulic drive unit for use in a vehicle or other application incorporates a motor connected to a pump through a porting system and an output shaft driven by the motor. A mechanical brake is used to brake the motor, while a valve provides a hydraulic brake for preventing flow between the hydraulic motor and the hydraulic pump. A brake actuator is connected to both the mechanical brake and the hydraulic brake, whereby actuation of the brake actuator causes both the mechanical brake and the hydraulic brake to be actuated.

Abstract: A flange for a torque converter, comprising a first sub-assembly that includes a first hole and second hole located along the first sub-assembly and wherein the first and second hole are configured to facilitate movement of a first pressure path from a transmission input shaft to a piston. The flange for the torque converter also includes a second sub-assembly that includes one or more welds that join a first contact-side of the second sub-assembly to the first sub-assembly, wherein a gap is defined between an area where the second sub-assembly is joined to the first sub-assembly.

Abstract: A cylinder acceleration mechanism includes a buffer tank that supplies and discharges oil to and from a bottom-side line that is connected to a bottom-side chamber of an actuating cylinder, and an inversion lever having an intermediate fulcrum as a rotation axis. The buffer tank includes a buffer chamber with a variable capacity achieved by a seal lid moving back and forth inside of a case, and extends and reduces a length of a coupling rod provided to the seal lid and projects from the case. A bottom-side branching line branched from the bottom-side line is connected to the buffer chamber. The actuating rod of the actuating cylinder and the coupling rod of the buffer tank are coupled to respective ends of the inversion lever. The actuating rod and the coupling rod extend and retract alternately with respect to each other as the inversion lever turns.

Abstract: A brake unit having a container which serves for accommodating working fluid and which is arranged with at least one connector piece in a receiving bore and which is sealed off by a sealing element which extends radially around the connector piece. In order to offer a simple, inexpensive and pressure-tight interface between connector piece in a receiving bore, it is proposed that a form fit transversely with respect to the direction of the longitudinal axis of the connector piece is formed by a displacement of the material of the sealing element during the installation of the connector piece in the receiving bore.

Abstract: An actuator, such as a pressure actuator or a vacuum actuator, has a housing and a plunger that is guided through the housing. A diaphragm is connected to the housing and to the plunger and forms a gas-tight pressure chamber with the housing. A pressure medium connector is provided on the housing and communicates with the pressure chamber to pressurize the pressure chamber. A braking element is provided on the plunger and enables a braking force can be exerted on the plunger.

Abstract: A skid for supporting a reciprocating pump assembly, the reciprocating pump assembly including a power end frame assembly having a pair of end plate segments and a plurality of middle plate segments disposed between the end plate segments. The end plate segments each have at least a pair of feet and the middle plate segments each having at least one foot. The skid includes a base and a plurality of pads extending from the base. At least a portion of the plurality of pads correspond to the end plate segment feet and at least another portion of the plurality of pads correspond to the at least one foot of each middle plate segment.

Abstract: A gas cylinder actuator with safely device, comprising a tubular containment jacket, two opposite heads for closing the tubular jacket, with corresponding sealing elements between the heads and the jacket, a first head having a through hole for the passage of a stem-piston, and a second opposite head, a stem-piston, between the tubular jacket, the heads and the stem-piston there being a chamber for pressurized gas, wherein at least one head of the two heads is constituted by a body that is separate with respect to the tubular jacket and is retained in the tubular jacket by means of an extraction-preventing shoulder that protrudes from the body of the head and is adapted to abut against a corresponding internal annular protrusion that protrudes radially from the internal surface of the tubular jacket.

Abstract: A valve of a hydraulically striking device having a housing, the housing comprising a moving member being seated inside the housing to move in a reciprocating manner by means of a hydraulic fluid. The moving member has an inner space, the valve has a return space and a pressure space provided, in the axial direction, at a distance from one another on the inner surface of the housing facing the moving member, wherein the rest of the inner surface of the housing in the same axial positions of the return space and the pressure space forms guide surfaces that are concentric with the moving member and against the moving member for centering the moving member.

Abstract: A gas cylinder actuator with overtravel safety device, comprising: a tubular containment jacket, two opposite heads for closing the tubular jacket, with corresponding sealing elements between the heads and the jacket, one head of which being provided with a through passage hole for a stem-piston, a stem-piston, between the tubular jacket, the heads and the stem-piston there being a chamber for pressurized gas, the gas cylinder actuator being characterized in that the tubular jacket has, at at least one of the portions affected by a head, a lightened portion that is preset to be deformed in case of compression in an axial direction, allowing the relative axial movement of the corresponding head toward the inside of the tubular jacket so as to form a gas discharge passage between the jacket, the head and the corresponding sealing element.

Abstract: In an electric motor-pump assembly, two working diaphragms, each delimiting a working chamber, are cyclically driven by a crank drive via connecting rods. The crank drive includes eccentrics for each connecting rod, which are placed on an axial bearing journal in the extension of an output shaft of an electric motor. In order to ensure a rotationally fixed connection between the eccentrics and the bearing journal to be produced and in order to ensure an angularly precise position of the two eccentrics, each of the eccentrics is connected to the bearing journal by a positively locking engagement.

Abstract: Provided is a hydraulic drive device, wherein the hydraulic drive device is provided with: a cylinder (101); a rod (103); a piston (102); a hydraulic pump (107); a tank (113); a valve (106) that can be switched between a positive state of connecting the hydraulic pump (107) and a head chamber (101h) and connecting a rod chamber (101r) and the tank (113), and a negative state of connecting the hydraulic pump (107) and the rod chamber (101r) and connecting the head chamber (101h) and the tank (113); and a confluence channel (114) at which, when the valve (106) is in the positive state, at least a portion of hydraulic oil going from the rod chamber (101r) to the tank (113) is merged into hydraulic oil going from the hydraulic pump (107) to the head chamber (101h).

Abstract: The present invention provides a hoisting system which includes at least one hydraulic hoisting cylinder, a pressurized gas reservoir, and an emergency lifting line with a first valve. The emergency lifting line selectively leads a pressurized gas from the pressurized gas reservoir into the at least one hydraulic hoisting cylinder.

Abstract: A hydraulic mechanical transmission includes a first hydraulic unit having a first shaft and a second hydraulic unit having a second shaft. The second hydraulic unit is connected in hydraulic fluid communication with the first hydraulic unit by high and low pressure lines. A mechanical torque transfer arrangement transfers torque between the first shaft of the first hydraulic unit and a rotatable housing of the second hydraulic unit. One of the first and second hydraulic units operates as a hydraulic pump and the other operates as a hydraulic motor, and both of the first and second hydraulic units have variable displacement.

Abstract: A fluid power system includes an electro-hydraulic variable displacement fluid pump driving fluid at a first displacement value. The system further includes a directional control valve, a sensor, and a controller. The directional control valve includes a valve member movable between a neutral position and at least one actuated position. The directional control valve diverts at least some fluid to an actuator while the valve member is in an actuated position, and the directional control valve exhausts fluid at an exhaust pressure through an outlet port to the fluid reservoir while the valve member is in the neutral position. The sensor measures a difference between the exhaust pressure and a nominal pressure and generates a signal based on the measured difference. The controller generates a flow command at least partially based on the pressure signal to modify the operation of the pump to drive fluid at a second displacement value.

Abstract: A working machine is disclosed. A boom supports an arm. An upper revolving body supports the boom. A lower traveling body mounts the upper revolving body in a rotatable state. A hydraulic actuator drives a hydraulic oil while relieving the hydraulic oil. A first pump supplies the hydraulic oil to the hydraulic actuator. A pump state detector detects load of the first pump. A controller reduces a flow rate of the hydraulic oil from the first pump to the hydraulic actuator when the pump state detector detects a predetermined state.

Abstract: A hydraulic circuit for a lift truck comprises a feed-through cylinder communicating with a free lift cylinder and a lift cylinder.

Abstract: Provided is a diaphragm type actuator that drives an operation rod in an axial direction of the operation rod, including: a diaphragm which is connected to the operation rod; a low pressure chamber which is adjacent to one end side of the diaphragm in the axial direction; a high pressure chamber which is adjacent to the other end side of the diaphragm in the axial direction; a return spring which is provided in the low pressure chamber and urges the diaphragm toward the high pressure chamber; and a retainer which is provided on a surface near the high pressure chamber in the diaphragm. An elastic member is disposed inside the high pressure chamber and the elastic member is disposed between a retainer and a wall surface facing the retainer in the axial direction.

Abstract: A method for detecting and isolation a leak in a hydraulic system having a supply pump serving at least one control valve is disclosed. In one embodiment, the control valve has multiple work sections. In step of the method, the hydraulic system is activated. In another step, an actuation command for at least one of the work sections is received, for example from a human-to-machine interface. Subsequently, the method may include generating a flow demand for the work sections for which an actuation command has been received. The method also includes the step of implementing at least one of a first, second, third, and fourth leak detection and isolation protocol to detect and isolate a leak between the pump and the control valve assembly, a leak between the reservoir and the control valve assembly and a leak between the at least one work circuit and the control valve assembly.

Abstract: A hydraulic drive unit of a hydraulic excavator is configured to include a first hydraulic pump (P1) that discharges a hydraulic oil for activating a boom cylinder (36) and the like, a first electric motor (M1) that drives the first hydraulic pump (P1), a hydraulic pump for revolution (P2) that discharges a hydraulic oil for activating a revolution motor (26), a second electric motor (M2) that drives the hydraulic pump for revolution (P2), and a motor control device (150) that controls the rotation of the first electric motor (M1) and that of the second electric motor (M2). The motor control device (150) is configured such that when the revolution of the revolving body is not activated by the revolution motor (26), control to deactivate the second electric motor (M2) is performed.

Abstract: A piston seal for a reciprocating piston is disclosed having the shape of split ring comprising a first end segment and a second end segment overlapping along a split surface that extends from the inner circumferential surface to the outer circumferential surface of the seal and is transverse to the direction in which the 5 piston moves when reciprocating in a cylinder bore. The split surface is spaced further from the leading lateral surface of the seal that faces a compression chamber associated with the piston than it is spaced from said trailing lateral surface of the seal that is opposite to the leading lateral surface.