Showing papers on "Piston published in 2010"

Fastening tool with an internal combustion engine with a unique opening and closing chamber abutment

Abstract: The tool is to be used for driving fastening members into a supporting material It comprises a cylinder (3), with a piston (5), a combustion chamber (1, 11), a cylinder head (12) bearing a fuel igniting means (36) in the chamber (1), a pin guide (9), for receiving a fastening member and the piston (5) shaft (7) and a cage (21) Return means are provided for opening the chamber (11), driving the pin guide (9) forwardly, opening and closing abutment means for the chamber (11) There are provided: one single central spring (32) for opening the chamber (11) and, on each side of the tool, one single opening and closing side chamber abutment (18, 55), integral with the chamber (11) and mobile in translation on the corresponding side of the cylinder (3)

Opposed piston engines : evolution, use, and future applications

Abstract: Explores the opposed piston (OP) engine and provides the first comprehensive description of most opposed piston (OP) engines from 1887 to 2006. Design and performance details of the major types of OP engines in stationary, ground, marine, and aviation applications are explored and their evolution traced.

Fastener driving apparatus

Abstract: A fastener driving apparatus includes a power source, a control circuit, a motor, a first cylinder, a first piston, a linear motion converter, a second cylinder, a second piston, an anvil, a valve arrangement and at least one sensor. During a compression stroke, the first piston is configured to compress gas in a first cylinder to a predetermined pressure. At the predetermined pressure, the valve arrangement assumes an open position for communicating the compressed gas to the second cylinder, thereby causing the second piston to move linearly and enabling the anvil to drive the fastener into the workpiece. During a return stroke, at a predetermined position of the first piston in the first cylinder, the valve arrangement assumes the open position for communicating a vacuum created in the first cylinder to the second cylinder and thereby causing the second piston and the anvil to retract to their initial positions.

Fuel injection valve

Abstract: PROBLEM TO BE SOLVED: To provide a fuel injection valve ensuring stable operation of the fuel injection valve, reducing a variation among products by a simple structure, and easily changing fuel injection characteristics. SOLUTION: This fuel injection valve includes: a body 1; an orifice plate 2 provided under the body 1; a command piston guide 6 provided under the orifice plate 2; a command piston 5 internally provided to the orifice plate 2 and command piston guide 6; a spring receiver 3 internally provided to the command piston guide 6; a spring 4 downwardly pressing the spring receiver 3; a nozzle body 8 arranged below the command piston guide 6; and a nozzle needle 7 internally provided to the nozzle body 8. The command piston 5 abuts on the lower surface of the body 1, thereby limiting the lift of the nozzle needle 7. COPYRIGHT: (C)2010,JPO&INPIT

Firearm sound suppressor

Abstract: A suppressor for a firearm is provided, wherein the suppressor can be selectively oriented relative to the firearm. The suppressor has an elongate body, a piston assembly and a cam assembly. A piston of the piston assembly can be fixedly attached to the barrel of a firearm. An indexing ring is radially fixed relative to the piston. The cam lever is selectively movable between a second position, in which the indexing ring is fixed relative to the elongate body, and a first position, in which the indexing ring can rotate relative to the elongate body.

Systems and methods for compressed-gas energy storage using coupled cylinder assemblies

Abstract: In various embodiments, a pneumatic cylinder assembly is coupled to a mechanism that converts motion of a piston into electricity, and vice versa, during expansion or compression of a gas in the pneumatic cylinder assembly.

Volumetric velocity measurements of vortex rings from inclined exits

Abstract: Vortex rings were generated by driving pistons within circular cylinders of inner diameter D = 72.8 mm at a constant velocity U0 over a distance L = D. The Reynolds number, U0L/(2ν), was 2500. The flow downstream of circular and inclined exits was examined using volumetric 3-component velocimetry (V3V). The circular exit yields a standard primary vortex ring that propagates downstream at a constant velocity and a lingering trailing ring of opposite sign associated with the stopping of the piston. By contrast, the inclined nozzle yields a much more complicated structure. The data suggest that a tilted primary vortex ring interacts with two trailing rings; one associated with the stopping of the piston, and the other associated with the asymmetry of the cylinder exit. The two trailing ring structures, which initially have circulation of opposite sign, intertwine and are distorted and drawn through the center of the primary ring. This behavior was observed for two inclination angles. Increased inclination was associated with stronger interactions between the primary and trailing vortices as well as earlier breakdown.

Hydraulically released window mill

Abstract: An affixation and release arrangement includes a first component having a fluid pressure chamber; a piston mounted in the first component and exposed to the fluid pressure chamber; a second component affixed to the first component through the piston, the piston responsive to fluid pressure increase within the chamber to unaffix the second component from the first component. Methods are included.

Steel piston with cooling gallery and method of construction thereof

Abstract: A piston and method of construction is provided. The piston includes a top part fixed to a bottom part. The top part has an uppermost surface with annular inner and outer upper joining surfaces depending therefrom. The bottom part has a pair of pin bosses with pin bores aligned with one another along a pin bore axis; a pair of upwardly extending annular inner and outer lower joining surfaces and a combustion bowl wall. Inner and outer weld joints fix the inner and outer upper and lower joining surfaces to one another. An annular cooling gallery is formed laterally between the upper and lower joining surfaces. The inner weld joint joining the top part to the bottom part is located within the combustion bowl wall and configured to minimized the compression height of the piston.

Fluid delivery device

Abstract: A fluid delivery device comprises a housing having a fluid reservoir. A needle is in fluid communication with the fluid reservoir in an engaged position and out of fluid communication with the fluid reservoir in armed and storage positions. A proximal end of a biasing member is coupled to the housing and a distal end of the biasing member is configured to deliver a force to the fluid reservoir. A piston member extends through the biasing member and is coupled to the distal end of the biasing member. The piston member is fixed with respect to the housing in a locked position such that the biasing member does not deliver the force to the fluid reservoir and moveable with respect to the housing in a released position such that the biasing member delivers the force to the fluid reservoir. Transitioning the needle from the storage position to the armed position transitions the piston from the locked position to the released position.

Analysis on oscillation in electro-hydraulic regulating system of steam turbine and fault diagnosis based on PSOBP

Abstract: The oscillation in electro-hydraulic regulating system is one of the main reasons leading to the oscillation of electric power system. In this article the influence of internal leakage and plugging of servo valve on the characteristic of the regulating system was analyzed. With the simulation in AMESIM it was found that the leakage of the power stage spool, the plugging of nozzle and orifice could both cause the oscillation of regulating system when the system oil pressure fluctuated. The fluctuation of piston displacement and oil pressure in oil servo motor in different fault state were analyzed. For preventing regulating system from oscillation it was needed to diagnose fault in the servo valve. Taking single leakage for example the change of parameters such as regulating time, steady displacement, and system frequency response, etc. were analyzed. The characteristic table of different fault was given based on simulation. In diagnosis particle swarm optimization (PSO) arithmetic was combined with BP neural network. The weight and threshold values were optimized by PSO arithmetic and five characteristics such as the piston displacement and system frequency were selected as the input of network. The results show that the PSOBP arithmetic has quick convergence speed and good generalization ability, with which the diagnosis of fault in servo valve can be done effectively.

Method and system for single exhaust valve bridge brake

Abstract: Systems and methods for providing compression-release and partial bleeder braking engine valve actuation are disclosed. In an embodiment of the present invention, a cam may be provided with a main exhaust lobe and a compression-release or partial bleeder lobe and a base circle portion between the two lobes. A rocker arm including an internal rocker passage may be operatively connected to the cam. The rocker arm may contact a valve bridge at a central portion. The valve bridge may be operatively connected to first and second engine valves at its first and second ends, respectively. A slave piston incorporated into the first end of the valve bridge and a master piston may be incorporated into the central portion of the valve bridge. A hydraulic circuit may be provided between the master and slave pistons. The master and slave pistons may be selectively actuated and the bleed hole may be selectively blocked and unblocked to provide compression-release or partial bleeder braking as a result of the valve actuation motion imparted from the cam to the valve bridge through the rocker arm.

Mixing device with piston coupling arrangement

Abstract: A device (1) for mixing substances to obtain an injectable medical product, the device (1) comprising a cartridge (50), a front piston (5), a front chamber (17) containing a liquid or a powder, a rear piston (6), a rear chamber (18) containing a liquid, a piston rod (7), and a bypass channel (19). The piston rod (7) is adapted to advance the rear piston (6) to collapse the rear chamber (18), whereby the liquid in the rear chamber (18) is forced to move to the front chamber (17) via the bypass channel (19). The piston rod (7) has a projection (10) which is adapted to mate with a recess (12) in the front piston (5) to provide an interlocking between the two components.

A Numerical Approach for the Evaluation of the Effects of Air Release and Vapour Cavitation on Effective Flow Rate of Axial Piston Machines

Abstract: This work illustrates a numerical methodology for the description of effective flow rate of axial piston pumps and motors. The presented mathematical model is similar to classical lumped parameter approaches that are commonly used to simulate hydraulic units; however, this work uniquely utilises a mathematical formulation for compressible flows based on an original description of fluid density. Assuming the behaviour of typical mineral oil, the model can evaluate fluid density for all possible values of pressure while considering the occurrence of gas cavitation (due to the release of air normally dissolved into liquid) below saturation pressure, and of vapour cavitation (due to liquid change of phase) below vapour pressure.The developed simulation model allows a description of several characteristics of the machine (i.e. instantaneous cylinder pressure and density, delivery and inlet flow rates, etc.) in its whole field of operation taking into account conditions of insufficient flow due to cavit...

Hydraulic setting assembly

Abstract: Novel hydraulic actuators and hydraulic setting assemblies are provided for use in downhole, oil and gas well tools. The novel hydraulic actuators include a cylindrical mandrel and an annular stationary' sealing member connected to the mandrel. A hydraulic cylinder is slidably supported on the mandrel and stationary sealing member and is releasably fixed in position on the mandrel. The stationary sealing member divides the interior of the cylinder into a bottom hydraulic chamber and a top hydraulic chamber. An inlet port provides fluid communication into the bottom hydraulic chamber, and an outlet port provides fluid communication into the top hydraulic chamber. A balance piston is slidably supported within the top hydraulic chamber of the actuator. The piston includes an axially extending passageway. Fluid communication through the piston and between its upper and lower sides is controlled by a normally shut valve in the passageway. In the absence of relative movement between the mandrel and cylinder, the balance piston is able to slide in response to a difference in hydrostatic pressure between the outlet port, is which is on one side of the piston, and the portion of the top hydraulic chamber that is on the bottom side of the piston.

Actuator and detachable connector of flexible clip applier

Abstract: A clip applier for deploying a surgical clip includes an actuator having a flexible wire and a collet chuck coupled to a piston. Further, actuation of the piston in a forward direction towards a distal end of the clip applier advances the flexible wire in the forward direction.

Downhole Actuator Apparatus Having a Chemically Activated Trigger

Abstract: A downhole actuator apparatus that selectively maintains a pressure differential between two pressure regions in a well. The apparatus includes a body defining first and second chambers. A piston is slidably disposed in the body and is selectively moveable between first and second positions. A barrier is disposed in the body to selectively separate the first and second chambers. A fluid is disposed in the first chamber between the barrier and the piston. A control system that is at least partially disposed within the body is operable to generate an output signal responsive to receipt of a predetermined input signal. The output signal is operable to create a failure of the barrier such that at least a portion of the fluid flows from the first chamber to the second chamber and the piston moves from the first position to the second position.

Well tools operable via thermal expansion resulting from reactive materials

Abstract: Methods of actuating a well tool can include releasing chemical energy from at least one portion of a reactive material, thermally expanding a substance in response to the released chemical energy, and applying pressure to a piston as a result of thermally expanding the substance, thereby actuating the well tool, with these steps being repeated for each of multiple actuations of the well tool. A well tool actuator can include a substance contained in a chamber, one or more portions of a reactive material from which chemical energy is released, and a piston to which pressure is applied due to thermal expansion of the substance in response to each release of chemical energy. A well tool actuator which can be actuated multiple times may include multiple portions of a gas generating reactive material, and a piston to which pressure is applied due to generation of the gas.

Industrial robot-based assembly method and device of piston, piston pin and connecting rod

Abstract: The invention relates to an industrial robot-based assembly method and device of a piston, a piston pin and a connecting rod. The method of the invention comprises the following steps: a vision camera is used to identify the positions and directions of the piston, piston pin and connecting rod, the grabing positions are calculated by a computer, a mechanical paw grabs the piston, the piston pin and the connecting rod to place on an intelligent assembly table; the connecting rod is inserted in the piston under the control of the intelligent assembly table; an industrial robot places the piston pin in a piston assembly hole; the vision camera in the device identifies and positions the piston, piston pin and connecting rod on a work platform; the data terminal of the industrial robot is connected with the data terminal of the computer; the vision camera is connected with the computer; the industrial robot controls the mechanical paw to grab the piston, piston pin and connecting rod and place on the intelligent assembly table; the serial signal line of the intelligent assembly table is connected with the computer, the control circuit board of the intelligent assembly table controls a connecting rod jig to insert the connecting rod in the piston; and the industrial robot assembles the piston pin in the piston assembly hole according to the sensorless assembly method.

Variable compression ratio device

Abstract: A variable compression ratio device including a piston, a crankshaft, and a connecting rod may include an eccentric bearing that contacts an exterior circumference of the piston pin, wherein an exterior circumference of the eccentric bearing contacts an interior circumference of a ring formed at the small end of the connecting rod, a ratchet rod slidably coupled inside the piston pin and movable along a longitudinal direction, a variable slider that selectively contacts one of both ends of the ratchet rod, and that is disposed at both sides of a cylinder for pushing the one of both ends of the ratchet rod in an opposite direction, and a guide plate for reciprocally moving both variable sliders along a vertical direction of the ratchet rod.

Compressor having piston assembly

Abstract: A compressor includes orbiting and non-orbiting scrolls forming first and second fluid pockets therebetween. First and second ports are disposed in the non-orbiting scroll and radially spaced apart from each other. The first port communicates with the first pocket at a first radial position and the second port communicates with the second pocket at a second radial position. A blocking device is movable between a first position preventing communication between the ports and a fluid source and a second position allowing communication between the ports and the fluid source. The first and second pockets have first and second pressures, respectively. One of the pressures may have a disproportionate pressure change compared to the other of the pressures after at least one of the pockets communicates with the fluid source through at least one of the ports. The disproportionate pressure change biases the orbiting scroll relative to the non-orbiting scroll.

Variable valve gear for internal combustion engine

Abstract: Disclosed is a variable valve gear comprising a camshaft phase change mechanism, which variably controls a phase of an intake cam with respect to a crankshaft, and a variable valve lift mechanism, which changes an opening timing of an intake valve more than a closing timing and basically continuously varies a lift and an open period of the intake valve. The lift and the open period are set lest the intake valve interfere with a piston of an engine, with the phase controlled to be most advanced by the camshaft phase change mechanism and the lift controlled to be maximal by the variable valve lift mechanism.

Firearm gas piston operating system

Abstract: A gas piston operating system for an autoloading firearm. The gas piston system may include a barrel having a longitudinally-extending bullet pathway, a gas block defining a piston bore, a passageway fluidly connecting the bore with the bullet pathway for diverting combustion gas from the pathway to the bore upon discharging the firearm, and a piston slidably disposed in the bore for reciprocating movement. In one embodiment, the piston includes a head having an axially-extending protrusion projecting towards the passageway. The protrusion is configured for slidable insertion into the passageway. The piston is movable from a first actuation position in which the protrusion is inserted into the passageway to a second actuation position in which the protrusion is at least partially withdrawn from the passageway. The protrusion acts to pretension a mechanical linkage between the piston and a reciprocating bolt assembly.