Abstract: Disclosed is a railway braking system including a first pneumatic distribution device formed by a first distributor provided with a single inlet opening connected to a source for supplying pneumatic pressure mediums and with a single outlet opening connected to a parking brake chamber in order to optionally supply a parking brake with a second pneumatic pressure medium so as to place the brake in either of inoperative and operative configurations, and a second pneumatic distribution device formed by a second distributor provided with a single inlet opening connected to the supply source and with a single outlet opening connected to a service pressure chamber in order to supply a service brake with a third pneumatic pressure medium of which the pressure value is predetermined, so as to apply a predetermined braking force when the parking brake is in the operative configuration thereof.

Abstract: Device for monitoring the administration of medication in a syringe that in one embodiment comprises a support element provided with a housing for a port access for coupling the syringe, said port access, when arranged in the housing, defining a longitudinal axis corresponding to the coupling direction and a transversal plane perpendicular to said axis and which passes through the port access. One or more cameras arranged in the support element that encompass in its/their visual fields the cylinder of the syringe when the syringe is coupled to the port access. The one or more cameras are placed within said plane, the optical axes of the one or more cameras intersecting said longitudinal axis, the support element and the one or more cameras do not overlap with the cylinder of the syringe in the direction defined by said longitudinal axis when the syringe is coupled to the port access.

Abstract: A fluid pressure cylinder comprises a rod insertion hole formed in a piston member, an auxiliary rod provided to a head side wall member so as to be inserted into the rod insertion hole, an open/shut valve mechanism for detection, and a fluid passage that is opened and shut by the open/shut valve mechanism. The open/shut valve mechanism includes a valve body reception hole formed in the auxiliary rod, a valve body that is movably held in the valve body reception hole and that has a recessed engagement portion on its external peripheral portion, and a spherical body mounted on the auxiliary rod so as to engage with the recessed engagement portion; when the piston member has reached a set shifting position, the valve body is changed over to the closed position or to the opened position due to cooperation between the spherical body, the recessed engagement portion, and the inner peripheral wall portion of the rod insertion hole.

Abstract: A piston slidably engaged in relation to the longitudinal axis of a shaft rotationally journaled proximate opposed ends to a housing which allows reciprocal travel of the piston within a cylinder of the housing with the external surface of the piston and the internal surface of the cylinder providing mated portions of a piston rotation generation assembly which induces rotation of the piston within the cylinder during reciprocal travel of the piston along the length of the shaft with the piston having rotationally fixed engagement with the shaft such that rotation of the piston within the cylinder generates a corresponding rotation of the shaft.

Abstract: A rotating cylinder includes a cylinder body, a piston, a piston shaft assembly, a main body and a guiding assembly. The cylinder body defines a receiving chamber. The piston, the piston shaft assembly, the main body and the guiding assembly are received in the receiving chamber. The piston shaft assembly is fixed to the piston, and defines at least one guiding groove lengthwise thereof. Each guiding groove includes a spiral portion and an extending portion. The main shaft is non-rotatably connected to the piston shaft assembly away from the piston and exposed out of the cylinder body. The guiding assembly sleeves on the piston shaft assembly and is slidably connected with the at least one guiding groove. The main shaft is driven to rotate when the guiding assembly engages the spiral portion, and move lengthwise when the guiding assembly is slidably connected with the extending portion.

Abstract: A rotary drive system includes a cylinder wall, a piston axially slidable along a longitudinal axis within the cylinder wall and a piston rod extending along the longitudinal axis and projecting at a drive side of the system axially beyond the cylinder wall. The piston rod is at the drive side attached to a carrier support member. A rotatable annular cam member extends at an axial cam position that is spaced at a distance from the drive side, coaxially around the cylinder wall. A carrier carries at a support side a pair of rollers engaging on opposed cam surfaces of the cam member, the carrier extending radially outwardly from the cylinder wall from the cam position to the carrier support member and being with a connecting end detachably connected to the carrier support member. The carrier includes an arm provided with a flexible section.

Abstract: A hydraulic driven turning device to be installed to a construction machine has a first body and a second body turning in relation to the first body, and a hydraulic cylinder attached from the first and second bodies to another body. A piston is axially movable via a hydraulic pressure medium, and a spiral part is attached to the piston. The spiral part causes a rotational movement to a counter part equipped with a spiral, whereupon the rotational movement can be transferred to be a turning movement of another body. The piston is arranged to be non-rotating in the cylinder by forming the cross section of the piston and the cylinder to be deviant from a round form, such as having an oval or angular shape, or by adjusting the piston to be eccentric in relation to a bearing axis thereof.

Abstract: An actuator for a rotary function element, having a housing with at least one pressure means supply and being closed at both sides by a cover, in which housing a piston is guided to reciprocate in a sealing manner, the piston containing diametrically opposed, convolution-like connecting links for a transverse axis of an actuator shaft rotatably mounted in one cover, and having two guide rods firmly anchored in the housing only at one end and engaging into guides in the piston, with the one guide rod anchored in one cover, whereas the other guide rod is anchored in the other cover, and the two guides end blind in the piston in opposite directions.

Abstract: A rotational hydraulic joint may include an extension chamber and a retraction chamber. Each chamber may include an end cap and a piston that moves relative to the end cap. One or more ports may add and remove fluid from the chamber. The rotational hydraulic joint may rotate in a cyclical direction when fluid is added to the extension chamber and in a countercyclical direction when fluid is added to the retraction chamber. The chambers may each include a torus-shaped cavity. Bladders may prevent fluid from leaking out of the rotational hydraulic joint. Stationary and movable electrodes may be coupled to the end cap and piston respectively. A plurality of rotational hydraulic joints may be combined to create a compound joint.

Abstract: In a method for applying a parking brake of a vehicle depending on the roadway conditions, at least one electromechanical braking system has a parking brake and an operational brake function. An operational brake force is produced on each wheel to slow the vehicle down to a standstill. A parking brake force is generated on at least two wheels of the vehicle. The parking brake forces have an amount that corresponds to the total of the previous parking brake forces applied to all of the wheels and subsequently the stopping of the vehicle is tesste. When the vehicle is maintained in the stop position, the amount of the parking brake force on the at least two wheels is reduced and simultaneously, the service brake forces that are reduced by a certain amount corresponding to the parking brake forces are built up at least on the other wheels.

Abstract: A cylinder includes a cylinder body assembly, a piston assembly, and a cylinder rod. The cylinder body assembly includes a cylinder body with an inlet and an outlet. The piston assembly includes a piston that is capable of moving axially and a rotation pin. A helical rotation groove is defined in the cylinder rod. The piston is sleeved on the cylinder rod via the rotation pin. One end of the rotation pin is connected to the piston, and the other end of the rotation pin is located in the rotation groove, such that the cylinder rod is rotatable in the piston.

Abstract: Helical spline actuators can be employed to actuate ball valves. In certain embodiments, an actuator can include a remote operated vehicle shaft, an internally splined shaft, and an externally splined shaft that can be used in combination to actuate a ball valve. In certain embodiments, an actuator can include a piston that is displaced axially and not rotated, an externally splined shaft, and an internally splined shaft that can be used in combination to actuate a ball valve. In certain embodiments, an actuator can include a piston, a spring, a spring cap, and a joint member wherein the spring cap and joint member translate axial force from the spring to the piston. In certain embodiments, an actuator can include a bearing that insulates a piston from rotational forces exerted by an externally splined shaft.

Abstract: A torsional vibration damper (1) comprising two elements (4, 5) which are rotatable relative to one another making use of at least one coupling part (3) which is arranged axially displaceable in a housing (2), in which the housing (2) is divided by the coupling element (3) into a first pressure chamber/partial chamber (D1) and a second pressure chamber/partial chamber (D2), and the first pressure chamber (D1) is connected to a first damping chamber (12) and the second pressure chamber (D2) is connected to a second damping chamber (13) and the first pressure chamber (D1) is filled with a damping medium (10) and the first damping chamber (12) is filled with the damping medium (10) and/or a first damping element (14) and the second pressure chamber (D2) is filled with a damping medium (10) and the second damping chamber (13) is filled with the damping medium (10) and/or a second damping element (15).

Abstract: An auxiliary cam assembly for an axial piston pump includes an auxiliary cam plate and an auxiliary cam retainer. The auxiliary cam plate is configured to be coupled a rotatable shaft. A central shaft opening extends through the auxiliary cam plate. A plurality of piston openings surround the central opening and extend through the auxiliary cam plate. A circumferential cut is formed in and extends around the outer peripheral surface of the auxiliary cam plate. The auxiliary cam retainer has a plurality of ramps formed therein, and each ramp slopes upwardly from a first end to a second end. A plurality of substantially flat pads are disposed between each of the ramps, and each pad extends between the first end of one ramp and the second end of another ramp.

Abstract: A piston slidably engaged in relation to the longitudinal axis of a shaft rotationally journaled proximate opposed ends to a housing which allows reciprocal travel of the piston within a cylinder of the housing with the external surface of the piston and the internal surface of the cylinder providing mated portions of a piston rotation generation assembly which induces rotation of the piston within the cylinder during reciprocal travel of the piston along the length of the shaft with the piston having rotationally fixed engagement with the shaft such that rotation of the piston within the cylinder generates a corresponding rotation of the shaft.

Abstract: An apparatus for compensating and/or transmitting forces/torques and rotational movements between two components, particularly for compensating for vehicle movements, in which at least one joint module is situated between the two components, which joint module converts a translational and/or rotational movement of a piston, to which a pressure medium is applied, into a rotational movement of at least one first rotatable shaft or of a first and a second rotatable shaft.

Abstract: A pressure-generating device includes an axle hub having a rotary shaft portion supported rotatably in a nonrotatable cylindrical support portion via bearings; a piston attached to the rotary shaft portion in a unitarily rotatable manner and so as to perform a pumping action, and, in cooperation with the rotary shaft portion, forming a pump chamber therebetween; a cam member and cam followers for converting a rotary motion of the axle hub in relation to the cylindrical support member to the pumping action of the piston; a suction path formed in the axle hub and enabling introduction of air into the pump chamber; and a discharge path formed in the axle hub and enabling discharge of air from the pump chamber.

Abstract: Hydraulic driven turning device to be installed to a construction machine, like at the end of the boom of the power shovel whereupon a first body (1) and a second body (6) turning in relation to it belong to the turning device and a hydraulic cylinder attached from the mentioned bodies (1), (6) to another body belongs to the device in which cylinder the piston (5) can be moved axially back and forth with the help of a hydraulic pressure medium and a spiral part (2) is attached to the piston (5) which spiral part causes a rotation movement to its counter part (3) equipped with a spiral whereupon the mentioned rotation movement can be transferred to be a turning movement of another body. The piston (5) is arranged to be non rotating in the cylinder located in the body (1) by forming the cross section of the piston (5) and the cylinder to be deviant from a round form, like to be an oval or angular or by adjusting the piston (13) to be eccentric in relation to its bearing axle (2).

Abstract: The actuator unit includes a hollow body defining a sliding chamber within; a piston mounted sliding inside said sliding chamber such to provide an actuation force and operated by a fluid fed from the outside; a body having one transmission end for the transmission of said actuation force prolonged outside said sliding chamber and one hooking end hooked to said piston, amplification means being interposed between said body and said piston to amplify said actuation force so as to obtain an amplified actuation force.

Abstract: An object of the present invention is to provide an electric actuator having a structure capable of reducing an external force or impact acting on a screw shaft when a piston rod is at a stretched position. An electric actuator 1 includes a first port 6, a second port 7, and a cylinder chamber connecting passage 9. The first port 6 is formed on an inner face of a rod-side cylinder chamber 5a of a cylinder body 2. The second port is formed on an inner face of a head-side cylinder chamber 5b of the cylinder body 2. the cylinder chamber connecting passage 9 connects the first port 6 and the second port 7. In the electric actuator 1, a piston part 4a of a piston rod 4 closes the first port 6 when the piston rod 4 advances.

Abstract: Helical spline actuators can be employed to actuate ball valves. In certain embodiments, an actuator can include a remote operated vehicle shaft, an internally splined shaft, and an externally splined shaft that can be used in combination to actuate a ball valve. In certain embodiments, an actuator can include a piston that is displaced axially and not rotated, an externally splined shaft, and an internally splined shaft that can be used in combination to actuate a ball valve. In certain embodiments, an actuator can include a piston, a spring, a spring cap, and a joint member wherein the spring cap and joint member translate axial force from the spring to the piston. In certain embodiments, an actuator can include a bearing that insulates a piston from rotational forces exerted by an externally splined shaft.

Abstract: A pneumatic or hydraulic cylinder (10) that has a piston (14) provided with a plurality of spherical elements (22), each of which is engaged in a slot (20) that extends longitudinally and axially relative to the longitudinal axis (12) of the cylinder (10). Movement of the piston (14) longitudinally results in angular movement of a piston (14) due to engagement of the elements (22) in their slots (20).

Abstract: A fluid operated rotary drive comprises a drive housing (2) and an output shaft (4) able to be caused to oscillate in relation to it and having a pivotal abutment arranged on it which cooperates with a counter abutment (34 and 35). The pivotal abutment is able to be positioned about the longitudinal axis (8) of the output shaft (4) in different abutment settings and is able to be clamped in a releasable manner respectively against a clamping face (56) on the housing by means of a clamping means (53).

Abstract: A mechanism transforms a longitudinal reciprocation movement of a piston in a cylinder into a combined unidirectional rotation and reciprocating movement of the piston. In order to achieve this transformation the piston includes a closed wave shaped groove on its circumference. The closed wave shaped groove has recesses at its apexes. The recesses break the symmetry of the groove. Balls that are located in the cylinder protrude into the groove. When the piston is reciprocating, the groove slides on the balls. A flexible heat shrink ring secures the balls in place and assures that the balls are constantly biased toward the face of the groove.

Abstract: Described herein is a servo for a gear change provided with a control shaft; the servo has: a first actuator, which displaces the control shaft axially along a central axis thereof and is directly coupled to the control shaft; and a second actuator, which renders a cam engaged by a pin projecting from the control shaft angularly fixed to a fixed frame to cause rotation of the control shaft about its central axis during the axial displacement; a cylindrical tubular element is provided, which is coaxial to the control shaft, receives inside it an end portion of the control shaft, supports the cam, and is pushed axially by the second actuator against the fixed frame.

Abstract: An axial piston pump has: a cylinder body that forms therein a cylinder chamber extending in an axial direction of a drive shaft and rotates integrally with a driven shaft; a piston that reciprocates in the axial direction of the drive shaft; and a cam device that rotates integrally with the drive shaft and has: a fixed cam member that has a cam surface capable of coming into contact with a cam follower coupled to the piston and is capable of rotating integrally with the drive shaft, with movement of the fixed cam member in the axial direction being restricted; and a movable cam member that has a cam surface capable of coming into contact with the cam follower and is capable of rotating integrally with the drive shaft, with movement of the movable cam member in the axial direction being allowed, irregularity differences in the axial direction of the cam surface of the fixed cam member and the movable cam member being different from each other.

Abstract: A hydraulic cylinder and associated hydraulic system that includes a sleeve cylinder in mechanical contact with a base and stationary between extended and retracted positions, which defines a second hydraulic fluid chamber. An internal cylinder is retained within the sleeve cylinder, defining a first hydraulic fluid chamber. A piston is employed having a piston rod retained within the sleeve cylinder, and a piston cap retained within the internal cylinder. An inner portion is defined between the piston cap and an interior portion of the internal cylinder. The internal cylinder is adapted to be displaced to the extended position to deliver a first power stroke upon pressurizing the first or second hydraulic chambers with hydraulic fluid. The inner portion is adapted to displace the sleeve and internal cylinder to the retracted position upon being pressurized with hydraulic fluid, to thereby deliver a second power stroke.

Abstract: A connector for pouring concrete into concrete formworks includes a piston tube and a filling port tube interconnected with each other and extending at an acute angle with respect to each other. The piston tube is mounted on the formwork or on a flange mountable on the formwork whereby a stopper piston axially movable in the piston tube may form a flush seal on an inside surface of a formwork element. A control unit including a spindle moves the stopper piston to close off a passage between the filling port tube and the piston tube. A quick connect coupling is supported on the filling port tube for connection to a concrete feed line.

Abstract: To eliminate necessity for rotating a rotation drive mechanism against frictional resistance originated by a sealing portion of a piston when an output shaft is rotated in a component linear motion and rotary actuator. An inside cylinder tube is concentrically provided in an outside cylinder tube and a piston that is driven by means of fluid pressure is fit into a cylinder chamber having a cylindrical shape formed between both the cylinder tubes in a manner so as to be slidable in an axial direction of the piston. A holder, which is rotatably supported by means of a bearing and which is capable of being rotated by means of rotation drive mechanism, is provided in the inside cylinder tube.

Abstract: The present invention utilizes a single shaft with cam-actuated control valves and one linear solenoid for control of air flow control vales in the air induction system for a V-type engine. According to various exemplary embodiments of the present invention, the single shaft and one sensor are utilized to activate all control valves. Additionally, the present invention can also be used in in-line engines. Advantageously, the present invention utilizes one moving shaft and sensor to activate all control valves on both sides of the intake manifold without restricting air flow by locating the shaft in the middle of the manifold—lower housing. Further, the control valves are not attached with screws, thus eliminating a tolerance stack-up at assembly problem. The air induction sub-system can be manufactured with metals or plastic, or any combination thereof.

Abstract: A pneumatic valve includes a housing having an inlet port and a delivery port and an exhaust port. A valve element is movable in the housing to control air flow between the inlet port and the delivery port and the exhaust port. The valve includes a rolling element actuator for converting a rotary actuation force to linear movement of the valve element.

Abstract: A fluid-powered tool assembly having first and second tool members, a body, and first and second rotatable shafts. The first shaft is attached to the first tool member for rotation therewith about a first axis, and the second shaft is attached to the second tool member for rotation therewith about a second axis. A linear-to-rotary force transmitting member is mounted for reciprocal longitudinal movement in response to selective application of pressurized fluid thereto.

Abstract: A piston pump delivers precise and repeatable volumes of a fluid from a reservoir to a downstream component, and includes a piston that is rotatably and reciprocally mounted within a cylinder. The outer periphery of the piston forms an interference fit with the inner periphery of the cylinder. At least one groove is formed in the outer periphery of the piston, with the groove defining a precise volume between the piston and the cylinder, and extending in an axial direction of the piston. The cylinder includes an inlet port for providing fluid communication between a reservoir and the at least one groove when the piston is in a first position, and an exit port circumferentially spaced from the inlet port for providing fluid communication between the at least one groove and a downstream component when the first piston is rotated to a second position where the at least one groove is aligned with the exit port.

Abstract: A swing-arm clamp is provided. The swing-arm clamp has a piston rod which is disposed therein. The piston rod is movable through the swing-arm clamp in response to movement by the piston along a longitudinal axis between first and second positions. The clamp also has a plug that is selectively positionable to affect the positioning of the piston rod.

Abstract: A drive unit is provided for the coaxial twisting movement of two stabilizer halves of a motor vehicle axle stabilizer with a tubular housing. Two housing halves are provided having an interior of which a hydraulically movable actuating piston is arranged displaceably in relation to the longitudinal axis of the housing. The longitudinal displacement of the piston is converted by an intercalated cam drive into a rotary movement of the housing halves around their common longitudinal axis. The housing halves are fixed with their respective free ends facing away from one another at a stabilizer halve. A hydraulically actuated releasing piston is pretensioned against a spring element and arranged at each opposite flat sides of the actuating piston, wherein the releasing pistons make possible the displacing movement of the central actuating piston in the pretensioned position and fix the actuating piston in its middle position in the released position.

Abstract: A rotary actuator including a tube. A piston disposed in the tube and configured for displacement there along. The piston having a spline extending radially outwardly therefrom formed by plurality of grooves and a plurality of non-grooved portions. At least some of the non-grooved portions of the spume defining a passageway extending radially inwardly through a side of the piston. An axle rod disposed in the piston and having a second spline. A set of pins each positioned through a passageway through the piston to engage the second spline.

Abstract: Actuator mechanism for a two-bucket grab device and having two grab arms arranged to move as pincers with respect to one another, has two hydraulic pivot motors with journals of the respective pivot shafts projecting from the motor housing and supporting the grab arms. Each of the pivot motors has a cylindrical tubular piece provided with an internal thread designed to engage an external thread on the respective pivot shaft. The tubular piece is a ring piston axially-displaceably, but non-rotatably held in a cylinder space formed in one of the respective bucket housings. Pitch of the threads is sufficiently large for the ring piston to transmit required torque to the respective pivot shaft by axial displacement of the ring piston. The displacement path of the ring piston between two annular cylinder chambers corresponding to high and low pressure chambers which can be loaded with hydraulic oil, corresponds to the desired pivot angle of the two arms of the grab bucket.

Abstract: An actuator for operation of a valve, said actuator comprising tubular housing, which accommodates therein a piston, mounted with possibility for reciprocating linear stroke motion, an operating rod, which is operatively coupled with the piston and is rotatable about the longitudinal axis upon reciprocating stroke motion of the piston and a cam follower arrangement for transferring the piston reciprocating linear stroke motion into rotation of the operating rod, The actuator is provided with at least two fixing rods for preventing rotation of the piston. The fixing rods are rigidly secured at one end wall of the cylinder. The fixing rods extend parallel to the longitudinal axis and enter into respective blind passages provided at the first piston end to allow the linear stroke motion. The actuator is provided with at least two additional fixing rods, to enable the linear stroke motion.

Abstract: An internal combustion engine provides a piston and a cylinder within which either the piston or the cylinder, or both, are free to move and using constraining motion, either the piston or the cylinder reciprocates. A shaft takeoff integral with either the piston or the cylinder experiences rotational motion. The motion is constrained by using laterally extending tits of either the piston or the cylinder to move in curilinear grooves of the other or of a housing encompassing the cylinder.

Abstract: The invention relates to rotating machine element that contains a mechanism actuated by a fluid pressure. The aim of the invention is to allow for a supply of actuation fluid also during the rotation. To this end, a non-rotating control element (2) is mounted on two fluid bearings (3) on the machine element, said bearings being spaced apart in the axial direction and allowing flows of actuation fluid to flow from one element to the other. Feed lines (R, S) in the control element are provided with a series of radially inwards facing ports (13, 14) and reception channels (17, 18) in the machine element, a series of radially outward facing orifices (15, 16) being disposed in such a manner that in every relative position both elements for every individual flow of actuation fluid are disposed such that at least one port (13, 14) is aligned with one associated orifice (15, 16).

Abstract: A main unit pumps the transferred liquid actuated by an auxiliary unit for pumping a working liquid. The auxiliary unit comprises a piston provided with an axial drilling (bore) for circulating working liquid between a tank and a compression chamber. The piston further comprises a valve for closing the drilling, the valve housed in the drilling between two ends thereof in permanent communication with the tank and the compression chamber respectively. The valve opens when the pressure of the working liquid in the tank exceeds that of the working liquid in the compression chamber and closes in the opposite situation. The compression chamber is delimited by a flexible diaphragm for pumping transferred liquid. The diaphragm is constantly elastically returned to the first position by a diaphragm spring.

Abstract: An apparatus for converting between reciprocal piston motion and rotary shaft motion. A unique H-shaped piston rod configuration and corresponding cylinder assembly for improving the efficiency of internal and external combustion engines. A Stirling engine having improved efficiency due to the use of heat exchangers that are integral with the cylinder assemblies. A Stirling engine employing a novel apparatus for rapidly varying power output.

Abstract: A thermal energy engine assembly comprises a cylinder, a piston set, a reheater, a spindle and a flywheel. An external thermal source is placed outside the cylinder to drive the piston set to have reciprocating motion along the spindle. The piston set has at least one groove on outer surface thereof and the flywheel has a rotatory motion guided by the groove. The reheater is arranged within the cylinder and used to accumulate thermal energy to enhance efficiency of the thermal energy engine assembly.

Abstract: A power machinery for a temperature-differential engine comprises a first valving piston, a power piston, a second valving piston, a spindle, a countershaft and a flywheel. The power piston and the second valving piston have spiral grooves on outer surface thereof and the flywheel is fit on the grooves through a sliding member. The flywheel moves along the grooves on the power piston and the second valving piston and has a rotation motion when the first valving piston, the power piston and the second valving piston have reciprocating motion along the spindle. The countershaft is used to keep a fixed separation between the first valving piston and the second valving piston.

Abstract: An output shaft is connected to a piston rod of a fluid pressure-driven linear cylinder through a converting mechanism for converting linear thrust of the piston rod into rotational torque and converting operation of the converting mechanism is controlled by operation setting means having a cam groove and a cam follower to thereby causing the output shaft to carry out linear motion and swinging rotation. A driving speed of the piston can be changed by adjusting fluid pressure acting on the piston in a linear motion area and a swinging area of the output shaft respectively.

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

Abstract: A three-position stop type swing actuator has a main piston freely moving in forward and backward directions in an axial direction within a casing, an output shaft placed at a coaxial position with the main piston in such a manner as to be fixed in an axial direction and freely rotate around an axis, a conversion and transmission mechanism converting a forward and backward motion of the main piston into a rotating and swinging motion of the output shaft, and a sub piston having a stroke smaller than that of the main piston a fluid pressure operating force larger than that of the main piston and arranged within the casing in such a manner as to freely move in the forward and backward directions and be capable of being brought into contact with the main piston so as to restrict a middle stop position of the main piston.

Abstract: An electrically actuated hydraulic power cylinder for use in a vehicle braking system. The power cylinder includes an electric motor, a rotary-to-linear actuator for converting rotary motion of the electric motor to a linear motion, and a hydraulic cylinder. In a preferred embodiment, the rotary-to-linear actuator is a roller screw assembly. The roller screw assembly converts rotational motion generated by the motor into axial movement of a piston which is disposed within the hydraulic cylinder. The movement of the piston pressurizes a volume of fluid. The pressurized fluid flows through an outlet port connected to either a single wheel brake cylinder or a plurality of wheel brake cylinders, thereby actuating the associated wheel cylinder. In a specific embodiment of the invention, the roller screw assembly is incorporated into the internal structure of the motor for compactness and weight reduction.

Abstract: An apparatus for performing a work operation on sheet material includes a plurality of drive wheels for driving the sheet material in cooperation with a plurality of pinch rollers along a feed path. Each of the drive wheels includes a drive surface having a plurality of primary teeth and a plurality of secondary teeth. Each primary tooth includes a top surface and a plurality of primary contact points to engage the sheet material. Each secondary tooth includes either a secondary contact line or a secondary contact point that come into contact with the sheet material to provide additional driving force and to prevent the sheet material from being perforated by the primary teeth. The primary teeth and the secondary teeth of the drive wheels engage the sheet material to advance the sheet material along the feed path. The drive surface of the drive wheels of the present invention minimizes slippage of the sheet material in the drive apparatus without damaging the sheet material.

Abstract: The present invention provides a high pressure pump (1), which comprises an electric motor (2) having a through-hole in axial direction on a rotation shaft (5), a thrust transmission shaft (8) engaged with threads of a rotation nut (6) operated by rotation of the motor, passing through the through-hole and performing linear reciprocal movement, plungers (9a, 9b) performing reciprocal movement in cylinders and connected to at least one end of the thrust transmission shaft (8), and a stress-strain sensor (16) provided on at least one of the plunger or the thrust transmission shaft.