Abstract: In a stationary blade of a gas turbine, the pressure resisting strength can be decreased by using low-pressure cooling air, and effective cooling can be performed by means of a simple construction. An inside shroud 1 and an outside shroud 2 are cooled by cooling air passing through an impingement plate. A trailing edge portion of a blade portion 6, which is thin in shape, is cooled by cooling air flowing in an air passage 10. Part of this air is discharged through a hole 12 on the side of the inside shroud 1 as inside seal air for a combustion gas passage.

Abstract: A combination cylinder and pistons wherein the pistons are provided with piston rods coaxially located in the cylinder so that fluid under pressure may be introduced into the head of one of the pistons at one end of the cylinder and transmitted through a tubular opening coaxial with said piston rod to the space above the head of the next adjoining piston and if desired, through similar openings in a plurality of additional pistons, until the last piston rod which is not provided with such an opening therethrough and which is connected to a tool.

Abstract: The present invention provides a method and apparatus for controlling a electro-hydraulic system of an earthmoving machine. The electro-hydraulic system may include a pump providing fluid to at least one fluid system. The electro-hydraulic system also includes an engine connected to the pump, and a controller for providing a commands to the engine. The method includes the steps of determining a desired characteristic of the fluid system, comparing the desired characteristic with a deliverable characteristic of the fluid system, and generating a power boost in response to the comparison; thereby controlling the electro-hydraulic system.

Abstract: Disclosed is a diaphragm-based spring brake actuator assembly which allows for the delivery of more force to the push rod without increasing the size of the actuator unit. The invention allows for the use of a stronger heavy main compression spring in the emergency brake chamber to provide greater emergency or parking brake force to the push rod. The invention also allows the service brake chamber to operate more efficiently when braking pressure is introduced. These functions are accomplished through modifications in the design of the actuators which allow for the deployment of a larger pressure plate inside either the emergency housing or the service brake housing, or both, allowing delivery of more force to the push rod of the actuator; and are made possible in actuator units having the same dimensional profile as existing weaker units.

Abstract: A pumping system is disclosed that includes a vacuum source. The pumping system includes a motor coupled to a centrifugal pump and a separator defining a reservoir in fluid communication with an inlet of the centrifugal pump. A water liquid ring vacuum pump having an inlet is provided in fluid communication with the reservoir of the separator. Accordingly, the vacuum pump may provide the required vacuum to prime the pump. To backflush that pumping system, the pumping system may include a first valve provided between the discharge port of the vacuum pump and the reservoir of the separator. A second valve may be provided between the reservoir of the separator and the inlet of the water liquid ring vacuum pump. During normal operation, the first valve fluidly connects the discharge of the vacuum pump to the atmosphere and the second valve fluidly connects the inlet of the vacuum pump to the reservoir of the separator.

Abstract: A ram cylinder piston stroke stop is disclosed, including a pair of opposed piston shaft gripping members each formed in an extruded shape along an axis with an integral extruded axially open spring end receiving socket. A spring includes opposed ends that are engaged within the spring end receiving sockets.

Abstract: A method and an apparatus for driving a hydraulic system of a construction machine, in particular a hydraulic excavator, having a plurality of control blocks which are fed via at least one pump each and each drive a plurality of hydraulically operated actuators of the construction machine. At least two control blocks are designed to drive the same actuator. The delivery capacity of the pump of the second control block can be connected up to the actuator via a delay element.

Abstract: A vacuum brake force booster for a vehicle brake system, in particular, with a master brake cylinder that can be attached along with the brake force booster to a wall of an automotive vehicle, with a housing comprised of at least two wall elements attached to each other, and with at least one reinforcing element that extends through the interior of the housing and has a thin-walled tubular shape. The essence of the present invention is that the reinforcing element on at least one end passes over into a radially extending fastening portion which extends, at least in a partial zone, in parallel to the associated wall element and is supported on the wall element so that the interior of the brake force booster is separated pressure-tightly from the atmosphere. The present invention permits a simple and low-cost assembly of the brake force booster without the necessity of additional sealing elements which are difficult to mount.

Abstract: An electromechanical hydraulic drive system for a vehicle is provided which is intended to replace the standard combustion engine of vehicles. One or more batteries power a main pump which provides hydraulic fluid flow to a hydraulic motor. The hydraulic motor includes a central shaft assembly with a plurality of sets of vanes mounted thereon. Fluid enters the hydraulic motor through a plurality of nozzles which are selectively spaced and adjusted for providing fluid to contact the respective sets of vanes at desired angles and at desired flow rates. The central shaft assembly has an output end which connects to a variable speed drive assembly for further modifying the conversion of fluid flow to mechanical movement. The variable speed drive connects directly to the differential of the vehicle for powering the vehicle. A subsystem is provided for recharging the batteries. The drive system may also be used with the existing brake system of the vehicle.

Abstract: A master cylinder realizes a stroke simulator function without the need to change the structure around a brake pedal and without impairing brake pedal feel, is easy to form by machining, and also facilitates a hydraulic fluid charging and air bleeding operation. A secondary piston is split to make the axial length thereof variable, thereby imparting the stroke simulator function to the secondary piston. By doing so, brake pedal feel is improved more than by separately adding a stroke simulator.

Abstract: A method and apparatus for hydraulically engaging and disengaging a hydraulic motor comprising a rotor and a stator.

Abstract: A vacuum servo unit or booster for a vehicle brake system includes a housing, movable walls disposed in the housing, a power piston, an input member, an atmospheric pressure valve seat, a negative pressure valve seat, a control valve having an atmospheric pressure seal portion and a negative pressure seal portion, an output rod, a reaction disc, and an actuator. The vacuum servo booster is designed so that the force produced from the output rod varies with the driving force of the actuator upon activation of the actuator.

Abstract: A fluid flow machine wheel as for an immersion agitator or for a waste water, slurry, sewage or feces pump or for a recirculation pump, comprises a shaft hub having an inner hub portion and an outer hub portion, between which there is disposed a hub damping element comprising an elastic material. Blades project from the outer hub portion. Blade damping elements of elastic material are provided between the outer hub portion and each respective blade. The fluid flow machine wheel may have either only the hub damping element or only the blade damping elements. The damping element or elements at least reduce vibration of or damage to the wheel or its drive motor, transmission, mountings for same and so forth, caused by uncontrolled hydraulic conditions or properties and afflux flows.

Abstract: A droop stop mechanism is provided for controlling droop of a rotor assembly in both static and dynamic states. The droop stop mechanism includes a U-shaped pendulum having a pair of spaced apart arms interconnected by a stepped base. One end of each of the arms is pivotally coupled to a body of the rotor hub assembly by a pin. A stop plate is coupled between the arms of the pendulum. A spring seat is coupled to the body of the rotor hub assembly opposite the stop plate. A coil spring is coupled between the spring seat and the stop plate. The stepped base includes a first striker portion for abuttingly engaging a tie bar housing of a rotor blade assembly in a static mode position, and a second striker portion for abuttingly engaging the tie bar housing in a dynamic mode position. The bias of the spring urges the pendulum between the static mode position and the dynamic mode position as centrifugal forces acting on the pendulum change.

Abstract: A compressor includes a piston and a shoe, which contact and slide on one another. The piston includes a sliding surface, on which a solid lubricant film is formed. The shoe includes a sliding surface that slides on the first sliding surface. A soft film that mainly contains soft metal is formed on the second sliding surface. The solid lubricant that forms the solid lubricant film is a solid lubricant other than a soft metal.

Abstract: A fluid pressure cylinder has a lock mechanism in which its entire structure is simple. Also, its assembling operation and maintenance are easy. The lock mechanism to be assembled to a body of a cylinder includes a fulcrum pin for immovably supporting a lock plate in its axial direction. A spring biases the lock plate in its tilting direction around the fulcrum pin. A returning pressure chamber is provided on the side in which the lock plate is tilted by the biasing spring and applies a fluid pressure to the lock plate against a force of the biasing spring by supplying a pressurized fluid. A sleeve is fitted over a piston rod of the cylinder for forming an inner peripheral wall of the returning pressure chamber. A pressure receiving member for air-tightly sealing a space between the lock plate and an outer peripheral surface of the sleeve and between the lock plate and an inner peripheral surface of the returning pressure chamber is mounted to the lock plate closer to the returning pressure chamber.

Abstract: Precision cast hollow stationary blade used for final stage of steam turbine is improved to enhance drain recovery efficiency. Hollows (4, 5), sectioned by rib (6) to be independent of each other, are formed in stationary blade (1) passing therethrough from outer shroud 2 to inner shroud 3. A plurality of ventral slits (10 to 20) are provided on blade surface ventral side linearly with predetermined interval between the slits in two parallel rows. Dorsal slits (21 to 26) are also provided linearly with predetermined interval between the slits. Drain on blade surface enters the hollows (5, 4) through the ventral slits (10 to 20) and the dorsal slits (21 to 26), respectively, and flows out of the outer shroud (2) or the inner shroud (3) as drain (40 to 43) to be recovered.

Abstract: A piston or plunger and a method for making the same A piston or plunger comprises a piston body and a sealing member. The piston body is preferably made from metal by moulding, such as casting or pressure moulding and sintering. The sealing member is made from a thermoplast, such as polytetrafluoroethylene (PTFE). The piston body has an outer or an inner peripheral surface part in which axially extending depressions or grooves are formed during moulding of the piston body. The axially extending grooves may be open at one or at opposite ends. An annular sealing member blank is applied to the peripheral surface part and is deformed and forced into tight engagement with the peripheral surface part and into the grooves or depressions formed therein. The sealing member formed is also exposed to a heat treatment. The piston or plunger having the sealing member applied to an outer peripheral surface part may, for example, be used in shock absorbers.

Abstract: A method and system for controlling a hydraulic driving circuit, which are simple in structure, capable of readily providing neutral position adjustment, manually adjustable and able to cope with a failure in the circuit. When an adjustment mode for adjusting the neutral position of a steering hydraulic pump is set, an offset command current value is calculated as a command current value to be output to a servo electromagnetic valve, and an offset command value calculated when a steering lever is in its neutral position is output to the servo electromagnetic valve to adjust the neutral position of the steering hydraulic pump.

Abstract: A variable displacement hydraulic pump includes a pump cylinder barrel having a plurality of axially arranged cylinder chambers disposed therein and each cylinder chamber includes a reciprocating piston therein. The pump is rotatably supported by the pump block and a motor block is separable from and connected to the pump block. A hydraulic motor is rotatably supported by the motor block and hydraulically connected to the pump through a pair of continuous passages formed in the pump and motor blocks. The motor includes an axis of rotation substantially perpendicular to an axis of rotation of the pump. A motor includes a cylinder barrel having a plurality of axially arranged cylinder chambers disposed therein and each cylinder chamber has a reciprocating piston therein. A thrust bearing is supported by a portion of the pump and motor block and is receivably engaged with the pistons extended from the cylinder barrel of the motor.