Abstract: A rotary actuator comprises a unitary housing having a cavity therein and defining a continuous internal sealing surface. A rotary piston is located within the cavity in sealing engagement with the sealing surface of the cavity such that the rotary piston divides the cavity into isolated first and second chambers, wherein the rotary piston is arranged to rotate about a rotation axis in accordance with a pressure differential applied between the first and second chambers.

Abstract: A rotor for a rotary cylinder includes a body having a tube and a plate which has the first end integrally formed to the tube, and the second end of the plate extends radially relative to the tube. The plate is a solid plate and has a curved outer periphery. A first recessed area is defined in each of the top and the bottom of the plate. A waist is formed to the plate and located between the first and second ends of the plate. A resilient coat is coated to the body and includes a Y-shaped seal portion along the curved outer periphery of the plate so as to be movably in contact with the inside of the cylinder.

Abstract: A bicycle hydraulic actuating device is provided with a housing, a non-linear piston and an operating member. The housing defines a chamber and has a fluid outlet. The non-linear piston is movably disposed in the chamber along a non-linear movement path between a first position and a second position. The operating member is operatively coupled to the non-linear piston so as to move the non-linear piston within the chamber between the first position and the second position in response to movement of the operating member.

Abstract: In one embodiment, a hydraulic blocking rotary actuator including a stator housing having a through bore to position a rotor assembly. A rotor assembly includes an output shaft and at least one rotary piston disposed radially about the output shaft. The rotary piston includes an integral first vane element and an integral second vane element each with peripheral longitudinal faces substantially concentric to the other. A continuous seal groove is disposed in peripheral longitudinal faces and lateral end faces of the rotary pistons. A continuous seal is disposed in the continuous seal groove. The bore through the stator housing includes an interior cavity with surfaces adapted to receive the rotor assembly. With rotation fluid ports blocked the housing cavity is sealed with the continuous piston seal for hydraulic blocking, preventing actuator displacement by external forces. Other embodiments are disclosed.

Abstract: A rotary actuator including a hydraulic valve including a borehole with shoulders, and a first operating connection and a second operating connection originating from the borehole, wherein a pressure balanced hollow piston is arranged axially movable in the borehole, wherein the hollow piston is fitted with a first outer diameter in a borehole section in a sealing manner, wherein the hollow piston includes the following axially subsequent to the first outer diameter: an enveloping surface with a large outer diameter in an axial portion of the first operating connection, and an enveloping surface with a small outer diameter in an axial portion of the second operating connection, wherein an inlet edge and an outlet edge extends from each of the first enveloping surface and the second enveloping surface, wherein the two inlet edges are oriented away from one another and the two outlet edges are oriented towards one another.

Abstract: A hydraulic cylinder device includes a cylinder, an axle and two blade units. The cylinder includes a chamber with a cross-sectional shape like a circle overlapping another circle. The axle is inserted through the cylinder. The axle includes two opposite grooves defined therein. Each of blade units includes a blade, a primary roller and a secondary roller. The blade is movably disposed in a related one of the grooves and made with a groove defined in a side close to an internal side of the cylinder. The secondary roller is disposed in the groove. The primary roller is disposed in the groove so that the primary roller is in contact with the secondary roller on one hand and in contact with the cylinder on the other hand.

Abstract: A sealing device for a swivel motor includes an outer part and an inner part as well as at least one working chamber located between them. The sealing device seals the working chamber and comprises at least two rectangular sealing elements housed in a groove enclosed in the outer and/or inner part running essentially parallel to the swivel axis of the swivel motor. Each of the sealing elements comprises at least one rectangular sealing part and at least one gasket.

Abstract: A rotary vane type actuator includes a vane assembly for converting pressure from a pressurised medium within the actuator into rotational movement. The vane assembly has a rotatable vane and a vane seal for preventing leakage of pressurised medium through or around the vane assembly. A side-plate is attached to the rotatable vane and the side-plate has a limiting protrusion that abuts the vane to maintain a gap between the vane and the side-plate so that the seal in the gap is not extruded from between the vane and side-plate.

Abstract: The invention relates to a sealing device for a swivel motor comprising an outer part and an inner part as well as at least one working chamber located between them, which seals the working chamber and comprises at least two rectangular sealing element housed in a groove enclosed in the outer and/or inner part running essentially parallel to the swivel axis of the swivel motor, each of which comprises at least one rectangular sealing plant and at least one gasket.

Abstract: Swivel motors have a large number of tightness problems on the inside, in particular in a broad operating temperature range. Therefore, to improve the tightness over a temperature range of ?40° C. to +130° C., a sealing device (20) is provided with an inner soft sealing element (20) and a plurality of outer rigid sealing elements (21, 22, 23, 24). The soft sealing element (20) and the rigid sealing elements (21, 22, 23, 24) are undetachably connected to one another. The circumferential sealing surfaces of the rigid sealing elements (21, 22, 23, 24), in the unloaded state, close flush with the sealing surface of the soft sealing element (20). The rigid sealing elements (21, 22, 23, 24) are spaced apart from one another by at least one radial compensating groove (25) and at least one axis-parallel compensating groove (26).

Abstract: A variable valve timing control device includes a rotation member for opening or closing a valve, a rotation transmission member engaged with the rotation member to be relatively rotatable, a vane provided on either one of the rotation member or the rotation transmission member, a hydraulic chamber formed between the rotation member and the rotation transmission member and including an advance angle chamber and a retarded angle chamber, the advance angle chamber and the retarded angle chamber being formed by dividing the hydraulic chamber by the vane, a first hydraulic passage for supplying and discharging a fluid to the advance angle chamber, and a second hydraulic passage for supplying and discharging the fluid to the retarded angle chamber. The vane includes a surface hardness determined to be higher than a surface hardness of a sliding surface of the rotation member or the rotation transmission member for sliding the vane.

Abstract: An oscillating motor includes a cylinder which is filled with hydraulic medium and which has at least one rib on its inside wall, whereby a motor shaft with at least one vane is supported inside the cylinder with freedom to oscillate, a sleeve concentric to the motor shaft, and a pressure-preloaded sealing arrangement inside each of at least two ring-shaped spaces between the cylinder and the motor shaft, which sealing arrangements seal the working chambers formed by the cylinder and its rib, the motor shaft, and the vane together with the cylinder covers at the ends. The ring-shaped spaces are connected to each other by a pressure equalization channel, and an axial groove, which forms the pressure equalization channel, is present in the contact area between the motor shaft and the sleeve.

Abstract: A variable camshaft timing mechanisms having a vane/housing format is provided. Working hydraulic chambers are created by imposing either single or multiple vanes of a rotor attached to the camshaft into a cavity in a housing that is attached to the camshaft sprocket. Fluid is allowed to normally exhaust from the hydraulic chamber during normal phasing until the rotor nears the end of its travel.

Abstract: A method for hardening the grooves of steel pistons of steel piston heads whereby hardening of the bottom of the grooves is avoided. The laser beam is directed onto the sides of the groove in an approximately tangential direction in relation to the outer diameter of the piston.

Abstract: Disclosed herein is a rotary vane actuator device with sealing assembly. The device includes a housing and a sealing assembly. The housing has a center opening defining a chamber. The housing includes opposing end plates for surrounding a stator. The stator having an aligned center opening and a rotor within the chamber. Within the chamber there are two openings, one serving as an inlet, the other serving as an outlet for rotational fluid. The rotor includes a vane assembly fixedly connected thereto. When the fluid enters the chamber, the fluid contacts the vane and moves the rotationally in the same direction. Each of the stator and the vane include seal packs. The end plates include sealing members which contact the stator and vane seal packs whether in the static or dynamic condition of the rotor. The combination of the seal packs and the end plate seal form the sealing assembly.

Abstract: A sealing strip is provided for sealing a space between two parts of a machine, for example, a rotary engine. The two parts form a groove for receiving the sealing strip. The sealing strip includes a filler piece, at least one spring element, at least one sealing body and a separating element. The filler piece is divided into two filler piece parts along the longitudinal direction. The filler piece parts are capable of independent longitudinal displacement with respect to one another. A spring element is arranged between the filler piece parts for preloading the filler piece into the groove. Each sealing body is formed in a frame-like shape for surrounding an end of the filler piece. The separating element is arranged between the filler piece parts for separating the filler piece parts and extends longitudinally from an end of the divided filler piece to at least a point where a sealing body surrounds the divided filler piece.

Abstract: Known oscillating motors have inter alia starting difficulties resulting from the fact that the sliding seal ring is subject to pressures applied within said ring, even at a standstill. According to the invention, an oscillating motor is provided, comprising a sliding seal ring capable of axially sliding on a journal (8) of the output shaft (7) and which rests on an internal surface of the cover (4) with a sliding and sealing surface. Annular rings which are located on the cover side of the sliding seal ring (23) are connected through pressure compensation bores (34) and pressure compensation channels (38) to the side of the sliding seal ring (23) oriented towards the pressure chamber (13) or the discharge chamber (14). Static pressure in the housing (27) of the diagonal seal ring (28) and dynamic pressure in the pressure chambers (13) can thus be compensated.

Abstract: The vane actuator according to the present invention is capable of operating effectively at a working pressure greater than 100 psig. The vane actuator comprises a vane shaft rotatably extending through a casing and a vane disposed within the casing defining a first pressure chamber and a second pressure chamber therein. The casing includes stiffening members for resisting deflection of and maintaining an internal seal within the casing when exposed to a pressure of 150 psig. The stiffening member may be located in the range of about 10° and 20° on either side of a casing centerline to minimize deflection of the casing when exposed to a pressure force.

Abstract: A vane type hydraulic actuator, wherein a chip seal 1, as a seal element between the case 43 and the rotor 44, can be pressed to contact tightly with the counter surface, without using a spring 47 as in the prior art, when a working oil is supplied either from the oil pressure chambers for timing retard or for timing advance. Simultaneously, the locking between the rotor 44 and the case 43 can be released. The hydrodynamic resistance at the gap between the tip of the seal element (chip seal) 1 and the counter surface of the seal element is made larger than that at the gap between the flank of the seal element 1 and the flank of the seal groove 2, which accomodates the seal element, so that the working oil of the hydraulic actuator flows between the flanks. The working oil at the bottom of the seal element urges the seal element to contact tightly with the counter surface.

Abstract: Known oscillating motors tend to present scaling problems; in particular they are often inadequately sealed in relation to the outside. The scaling elements also have a short service life as a result of the considerable strains to which they are subjected. The invention therefore provides an oscillating motor whose annular sealing ring consists of a sliding sealing ring (23) and a soft sealing ring, said rings being positioned next to each other on a common axis. The soft sealing ring is configured as a diagonal sealing ring (28) and is located on the sides of the pressure or discharge chambers (13, 14). The sliding sealing ring (23) is configured so that it is torsionally rigid in relation to the rotor (2). For this purpose, it preferably has two axial grooves (32), said grooves being arranged so that they are parallel and in pairs. The grooves (32) correspond to driver elements (31) located on the rotor wings (10).

Abstract: Radial oscillating motors are generally fitted with an outer overflow oil line in order to protect sealing elements. This requires an over large amount of devices and system expenditure. Large amounts of installation space are also required for oscillating motors of this kind. The invention provides a radial oscillating motor wherein each bearing (29) is hydraulically connected to a discharge chamber (14) via a main duct (30) in addition to radial ducts (31, 15, 16, 35, 37, 38) and axial ducts (32, 36) in a driven shaft (7). A non-return valve opening out in the direction of the discharge chamber (14) is inserted into the ducts (31, 32, 37, 38).

Abstract: A fluid powered rotary actuator (10) having a stator (13) and a rotor (15) journalled with limited rotary motion within the stator includes at least one arcuate chamber defined between the rotor and stator and has an angularly movable vane (16) fixed to the rotor. There is a seal member (21, 23) at the vane for slidingly sealing a cylindrical sidewall surface of the stator thereby subdividing the arcuate chamber into two variable volume subchambers (25, 29; 27, 31). Pressurized fluid is ported selectively to one of the subchambers while a fluid egress path for fluid from the other of the subchambers allows the rotor to move angularly within the stator. There is a fail-safe aperture (22) in the cylindrical stator surface in a region traversed by the seal member and for conveying fluid from a selected one of the subchambers, as determined by the position of the vane, and a fail safe valve (24) coupled to and normally blocking the egress of fluid from a subchamber through the aperture (22).

Abstract: A rotary hydraulic actuator including a sealed vessel including brackets and a casing, a partition vane attached to a shaft supported by the brackets for dividing an inside of the sealed vessel into a first pressure chamber and a second pressure chamber and pivoting the shaft by a pressure difference between the first and the second pressure chambers, suction and exhaust hydraulic ports and a drain port installed to the casing, a hydraulic control valve mounted to the casing for conducting a hydraulic control along with the suction and exhaust hydraulic ports and the drain port, groove-like hydraulic pressure supply paths installed to a face of one of the brackets in contact with the casing for communicating the first pressure chamber and the second pressure chamber respectively to the suction and exhaust hydraulic ports and a groove-like drain path installed to a face of other one of the brackets in contact with the casing for communicating to the drain port.

Abstract: In a rotary hydraulic actuator wherein a hermetic casing has the inside divided into a first hydraulic chamber and a second hydraulic chamber by a vane slidably rotatable on an inner curved wall of the casing, the vane is rotatable by an oil pressure supplied to the respective chambers, and the movement of the vane is taken out from an output shaft, the inner wall of the casing which is in sliding contact with the vane is formed with a polytetrafluoroethylene sliding member.

Abstract: A submersible cleaner adapted for travelling across surfaces of swimming pools and which avoids significant wear on an associated suction pump includes a housing with a forward edge, a suction chamber within the housing and a vibratory oscillator positioned within the suction chamber to continuously vibrate the cleaner during operation. A shoe member is removably fitted to the bottom of the housing and has rows of segmented tread elements which are elongated in a direction parallel with the front edge of the housing and which are angled rearwardly from the bottom with respect to the direction of travel in order to cooperate with the vibratory movement and urge the cleaner along the direction of travel.

Abstract: A fluid operated rotary drive, which possesses a drive means having an output drive shaft able to be driven for oscillating motion. On one axial side of the drive means a position detection means is arranged, which possesses an actuating member connected with the output drive shaft and which on rotary motion of the output drive shaft performs an oscillating movement about a pivot axis. The actuating member cooperates with sensors, which may be set on holders. Each holder is arranged on its own setting ring, such setting rings being arranged coaxially in relation to each other with the holders extending away from the drive means. The setting rings are able to be turned in relation to one another and furthermore in relation to the housing for setting the positions to be detected and may be fixed in the settings made.

Abstract: A rotary actuator (16) has an inner body (32) forming a rotor and at least one outer body (34) forming a stator. The inner body (32) and outer body (34) carry blades (40,44) arranged in an alternating manner and defining between them two series of variable volume chambers. The cross-section of the chambers and the height of the triangular blades (40,44) decreases from one end to the other, as a result of a substantially frustum-shape of the inner body (32). Such an actuator (16) can be used for controlling an aircraft rudder or control surface and it is then positioned along the articulation axis of the rudder or control surface.

Abstract: A rotary actuator (1) comprising a housing (2), which defines a working chamber (3) for actuation with a pressure fluid and having at least partially circular section, a pivoting piston (5) which is arranged sealingly against the inner wall (4) of and rotatable between two end positions in the working chamber, is featured in that the pivoting piston (5) itself is pivotally supported in bearings (16) which are arranged in the housing (2) axially at each side of the working chamber (3), and wherein it comprises means for cooperation with an external rotary shaft, whereby the housing (2) on at least one of its end walls is adapted so as to be contacted against and be fixedly fastened to a corresponding end wall portions of a second rotary actuator housing (2), and whereby these housings are fixable to one another in such a way that the axes (X) of the pivoting pistons of the respective housings are coaxial and that the pivoting pistons thereby are capable of affecting one common outgoing shaft.

Abstract: A cleaner for swimming pools includes a housing having a pressure differential chamber with an opening defined by opposing walls and an oscillator pivotally mounted within the opening on a pivot axis extending between the walls. A seal is loosely fitted within a recess along a side of the oscillator for movement outwardly across a gap between the oscillator and the wall of the opening to close the gap when necessary for purposes of starting the oscillator and for opening the gap when required to allow grit, leaves and the like to pass through.

Abstract: A rotary actuator has a cylinder and a motor shaft as well as end caps which define a working area. A number of ribs extend from the inside wall surface of the cylinder and an equal number of vanes extend from the outside shell surface of the motor shaft. The ribs and vanes divide the working area into working chambers which are alternately supplied with hydraulic medium. Seals are disposed in grooves in the ribs and the vanes, which seals are braced between the inside wall surface of the cylinder or the outside shell surface of the motor shaft and the respective groove base, so that the seals hydraulically separate the working chambers from one another. The outside shell surface of the motor shaft and the inside wall surface of the cylinder are designed with recesses, so that the prestress on the seals is neutralized in at least one installation position of the motor shaft. The rotary actuator can be used in a stabilizer bar of a motor vehicle suspension system.

Abstract: Rotary actuator, including a cylinder and motor shaft, as well as end caps which define a work chamber, whereby a number of ribs on the inside surface of the cylinder and the same number of vanes on the motor shaft divide the working area into work chambers which are alternately supplied with hydraulic medium, and seal units inside grooves in the ribs and vanes which hydraulically separate the work chambers from one another, characterized by the fact that there is a space between the seals and the side walls of the grooves which is offset by an additional volume.

Abstract: An hydraulically powered rotary actuator for rotating a first portion of a work machine relative to a second portion of the work machine has inner and outer rings enclosed by first and second cover plates. The inner and outer rings are spaced apart to define an hydraulic power chamber to which pressurized fluid is supplied to rotate one of the inner or outer rings. The first portion of the work machine is connected to the rotatable ring and rotates with it. A large diameter bearing assembly rotatably supports the rotatable ring and the first portion of the work machine. Most prior work machines with rotatable car or upper structure require large expensive components including gear reduction assemblies, an hydraulic motor, and large diameter swing gear. The subject actuator simplifies the construction by eliminating many of the prior components.

Abstract: An hydraulically powered rotary actuator for rotating a first portion of a work machine relative to a second portion of the work machine has inner and outer rings enclosed by first and second cover plates. The inner and outer rings are spaced apart to define an hydraulic power chamber to which pressurized fluid is supplied to rotate one of the inner or outer rings. The first portion of the work machine is connected to the rotatable ring and rotates with it. A large diameter bearing assembly rotatably supports the rotatable ring and the first portion of the work machine. Most prior work machines with rotatable car or upper structure require large expensive components including gear reduction assemblies, an hydraulic motor, and large diameter swing gear. The subject actuator simplifies the construction by eliminating many of the prior components.

Abstract: A self-propelled submersible suction cleaner as used to clean the surfaces of a swimming pool transfers a vibratory movement of an oscillator located within the flow path of a suction chamber for propulsion over the submerged surface of the pool. This vibratory movement of the oscillator is also converted to a unidirectional rotational motion used in conjunction with a gear train to cause the cleaner to rotate through at least a 90 angle allowing the cleaner to improve on the random path taken by the cleaner and to maneuver away from obstacles such as pool steps potentially stopping the cleaner movement. The cleaner includes a elevation limiter that keeps the suction chamber submerged as the cleaner climbs a vertical wall and attempts to rise above the water level in the pool. A pressure relief valve eliminates the concern over debris blocking the suction and causing potential damage to the pool pump and motor.

Abstract: A robotic assembly is provided that simulates the size, appearance and movement of a human torso. The torso includes a unique combination of high speed rotary and linear actuators arranged in a geometry that enables anatomically correct human-like movement, and which provides sufficient internal room and mounting surfaces for the actuators and related equipment such as hydraulic or pneumatic lines, electronic control circuits, valves, and audio playback devices. A preferred embodiment of the present invention provides up to nine degrees of freedom. The upper torso includes a pair of rotary arm actuators ("rotacs") for rotating arms up to 200 degrees. The rotacs are pivotally attached to a centrally located mounting structure for up-and-down motion (shoulder shrugging) and for forward-and-back motion (shoulder forward).

Abstract: A submersible suction cleaner includes a chamber, an oscillator pivotably mounted within the chamber for movement to and fro with a gap between an edge of the oscillator and a wall of the chamber through which water containing grit flows during operation. The chamber wall or the oscillator has a slidable, retractable seal operable to open when grit lodges between the oscillator and the chamber wall to thereby open the gap and allow the passage of grit therethrough.

Abstract: This sealing mechanism is provided with a cap in an overall sectional configuration of a cramp iron which is made from a synthetic resin, and a resilient sealing body in an overall sectional configuration of a cramp iron. An inner surface of the cap is formed with an inserting groove in which the resilient sealing body is fitted. When the resilient sealing body is fitted in the inserting groove in the cap, this sealing body is partially protruded from inner surface of the cap. The cap is also formed with longitudinal lubricating slots on the outer surface thereof. Moreover, both side surfaces of the cap are provided with a plurality of notches at predetermined regular intervals of place which extend from the outer surface of the cap to the inner surface thereof.

Abstract: A rotary actuator device having an annular piston rod, the device comprising at least one piston held provided with sealing means and co-operating with an annular piston rod mounted so as to be capable of moving in an annular chamber, together with means for selectively applying a fluid under pressure in said annular chamber, wherein the piston head co-operates with the piston rod via a hinge having one degree of freedom in rotation and one degree of freedom in translation, said hinge comprising a piece in the form of a knife whose edge co-operates with a V-groove in a female portion of triangular profile, the knife edge and the V-groove being parallel to the axis of rotation of the piston rod. This disposition enables the forces exerted on the sealing means to be brought back into balance, thereby increasing sealing even under high pressures.

Abstract: The present invention relates to a fluid operated device having a stator and a rotating vane mounted on a shaft enclosed in a cylindrical body with head members at each end of the housing. The pressure of the fluid is different on each side of the vane for such devices, and an elastomeric seal is provided on the vane to prevent leakage of fluid from one side of the vane to the other. The present invention provides for a metal to metal seal between the cylindrical body and the head members such that the elastomeric seal on the vane will seal against metal surfaces as it sweeps along the union of these two members.

Abstract: An oscillatory rotary actuator is provided for controlling an adjustable valve. The actuator comprises a freely rotating, cylindrical housing with concentric inner and outer walls about its center. The housing has at least one depending vane, which functions as a rotary piston, that is radially disposed between the inner and outer walls. The rotary actuator further comprises an annular chamber casing which has two concentric walls that are designed to mate between the inner and outer walls of the housing member to receive the depending vane(s) between the concentric walls of the chamber casing. At least one radially extending chamber wall is interposed and attached to the concentric walls of the chamber casing. When the housing member is fitted over or receives the annular chamber casing, the housing, chamber casing and chamber wall collectively form at least one rotary chamber for the arcuate movement of the depending vane, or rotary piston, therein.

Abstract: The present invention provides housing member for a rotary fluid powered actuator including a cylindrical housing member having an opening in at least one end, a head member received on each open end of the housing where each head has a central aperture in generally aligned relation with the longitudinal axis of the housing, a shaft member to extend through the central aperture for rotation therein and journal means to journal the shaft in the housing adjacent each end thereof and a vane member to extend outwardly from the shaft member for rotation therewith in response to fluid pressure in the housing where the housing member includes at least one stator member, integral therewith extending radially inwardly from the sidewall of the housing and adapted to receive a seal member to provide a seal between the termination of the stator and the shaft and members extending along a portion of the length of the housing to define bolt passages, and bolt members to be received in the bolt passage where the bolt member

Abstract: A torque resistance device includes a rotor, a vane, and a valve device for regulating the resistance at which the rotor operates. The valve device is mounted to the housing for the rotor and vane assembly. The valve device includes a valve member which is adjustable via a threaded shaft.

Abstract: A rotor assembly includes a shaft and a planar vane extending in a radial direction from the shaft and having a peripheral groove receiving a resilient sealing gasket. The vane includes a tongue portion which depends into a radial cavity in the shaft and is sealably cemented thereto. Radially extending ribs on the ends of the tongue are accurately fitted against the ends of the cavity which are aligned with the adjacent ends of the bottom walls of the peripheral groove.

Abstract: A swinging-piston ICE comprising a swinging piston (3), connecting rod (2), intake port (16) and exhaust ports (17). Combustion chambers (A,C) are formed on opposite sides of the piston (3) where oil nozzles (13) are provided. The piston is sealed at its end surfaces (3c) and along the cylindrical surface (3d) wherein transfer ports (N) are provided. A slide shoe (15) opposite the transfer ports is provided for blocking the exhaust ports.

Abstract: Rotary hydraulic actuator comprising a vane (1) which is mounted rotatably and sealingly in a chamber (2) made in a body (3) and on the faces of which a hydraulic fluid pressure is exerted, the vane being fixed mechanically to an element to be driven in rotation; the vane (1) comprises two parts (4, 5) extending radially on either side of its axis of rotation (XX), and these two parts are each movable in a chamber (8, 9) extending over an angular sector less than half a circumference, this chamber being divided into two compartments by the said part (4, 5); the actuator has a hydraulic circuit for feeding the chambers (8, 9), which is designed so as to be capable of driving the vane (1) in rotation in one direction or the other. This arrangement reduces the overall size of the actuator and increases its reliability.

Abstract: Each of the head assemblies of a rotary actuator includes a tapered roller bearing in which the shaft of the actuator is journaled and an end plate against the inner face of which the stator and movable vanes of the actuator are sealed by a resilient jacket. A pressure equalizing passageway extends through each end plate from the cavity in which the associated roller bearing is mounted to the gasket which seals the stator to the end plate, thereby to equalize the pressure across the end plate and reduce the torque required to initially rotate the actuator shaft.

Abstract: A rotary actuator having a housing defining an opening, an output shaft extending through the opening, a stator vane and rotor vane associated with the output shaft and opening to define a plurality of actuation chambers and an inner surface of the housing extending inwardly past a shoulder portion of the output shaft to seal directly against the shaft.

Abstract: A device for sealing surfaces defined between a collar of a motor shaft and a motor cover comprises a pre-stressed sealing ring mounted at the surfaces which extend at right angles relative to each other, a viscous elastic element for prestressing the sealing ring, and a guide ring positioned between the elastic element and the sealing ring. The sealing ring is positioned between the surfaces to be sealed and is pressed by the guide ring which is displaceable by a pressure medium.

Abstract: A hydraulic or pneumatic oscillating piston motor has a housing (1), a driven shaft (2) mounted in the housing for rotation and an oscillating piston (3) that is fixed to the shaft. The piston has two lever arms (49,8) having pressure areas of different size, which arms are sealed with respect to the housing (1) dividing the housing (1) into two working spaces (4,5) into which a pressure medium can be introduced. The oscillating piston (3), actuated by the pressure medium, is free to oscillate back and forth through a maximum angle of rotation which is determined by means of a stop (38) and the housing. The first lever arm is designated in the form of a bushing (49) whose shell surface along its external periphery is at least partly surrounded by a coaxial shell seal (64). This seal has uniformly distributed, rib-like sealing lips (75) along its periphery and interacts with a opposite surface (9) attached rigidly to the housing (1). The maximum angle of rotation of the oscillating piston (3) is at least 180.

Abstract: A seal arrangement for use in a rotary actuator having a housing and an end wall where a shaft extends through an aperture in the end wall and and carries a vane, a stator assembly is provided and directly inwardly from the housing having an end edge in adjacent relation with the end wall and a longitudinal edge adjacent the shaft. A groove is provided extending longitudinally along the end edge and the longitudinal edge and is adapted to receive a generally rectangular stator seal member so the stator seal member end edge abuts the end wall to provide a fluid seal therebetween and where an annular groove is provided around the shaft receiving aperture and is adapted to receive a generally circular ring seal. The generally circular "O" ring seal includes a tab member having a thickness less than the thickness of the "O" ring member and the tab extends radially outwardly from the "O" ring member parallel to the groove of the end edge to engage the stator seal member.