Abstract: A light-weight reciprocating element is disclosed. The reciprocating element may include a body defining a cavity, the body having a closed distal end and an open proximal end opposite the closed distal end, wherein the body is configured to apply a pressure to a working fluid. The cavity extends from the open proximal end towards the closed distal end. The reciprocating element may include an insert disposed in the cavity, the insert is configured to prevent debris from accumulating within the cavity.

Abstract: A sealing mechanism including a first seal member, a second seal member arranged so as to face the first seal member, and a deformed nucleus member arranged in a space formed at least partially between the first seal member and the second seal member, and becoming a nucleus of deformation in the sealing mechanism. The deformed nucleus member is configured by a combination of rod-like members and plate-like members respectively formed from a plurality of materials having different linear expansion coefficients, and is fixed to each of the first seal member and the seal member. The deformed nucleus member contracts in at least one direction on a cross-section of the seal groove, along with an increase in temperature of the deformed nucleus member. The first seal member and the second seal member respectively have abutment surfaces abutting on an inner surface of the seal groove or the facing surfaces.

Abstract: A hydrostatic positive-displacement machine, in particular a hydrostatic axial piston machine, having a cylinder drum with at least one cylinder, in which a longitudinally displaceable piston is received, which is supported directly or indirectly by a support portion on an inclined plane of the positive-displacement machine. An outer circumferential surface portion of the piston is in bearing contact with an inner circumferential surface portion of the cylinder.

Abstract: A separating device for fluid media receivable in a working housing (1). A separating piston (3) is inside the working housing (1) and separates two media compartments (5, 7) from one another in a media-tight manner. The separating piston (3) is provided along its external circumference with a guide (19). During a transversing movement of the separating piston (3) inside the working housing (1), the guide bears slidably on the housing inner wall (21) and is an integral component of the separating piston (3).

Abstract: The invention concerns a hydraulic piston machine, in particular a water hydraulic machine, with at least one cylinder, in which a piston (4) is arranged to reciprocate, the piston (4) comprising a hollow that is surrounded by an annular wall and has one open end. It is endeavored to keep cavitations small. For this purpose, a filling member (13) is arranged in the hollow (12), the filling member (13) having at least a radial projection (22) and the annular wall (16) having at least a radial depression (17) in the inside facing the hollow (12), or the annular wall (16) having a radial projection and the filing member (13) having a radial depression, the depression having a restraint (19), at least at the end adjacent to the open end (18) of the hollow (12), and the projection (22) and the depression (17) engaging each other.

Abstract: A piston of a fluid pressure cylinder comprises a sealing ring interposed in a sealing ring accommodation groove, a piston ring that is interposed in a piston ring accommodation groove of the piston and comprises a fractured portion, and a backup ring that is attached to an outer peripheral surface of the piston and contacts the sealing ring and the piston ring. A groove for holding the backup ring is not required, and therefore a diameter of the piston can be reduced relative to the sealing ring. As a result, attachment of the sealing ring to the piston is simplified.

Abstract: The present invention relates to a bung (20) for drug containing cartridges (10) for use in drug delivery devices wherein the bung (20) has a distal end face (22), a proximal end face (24) and a lateral area (26), wherein the bung (20) comprises at least two different materials, a first material (30) covering the whole lateral area (26) of the bung (20) and a second material (32) which is at least partly arranged inside the bung (20), wherein the first material (30) has a larger compressibility than the second material (32) and wherein the whole lateral area (26) has a flat surface. Furthermore, it relates to a cartridge (10) and to a drug delivery device comprising a bung (20) as claimed.

Abstract: The invention provides a liquid pump using an elastomeric piston. The liquid pump has a piston assembly (10), which comprises: a piston rod (11); a piston head (12); a piston engaging portion (15) which is between the piston rod and the piston head in a necking shape; and a piston (13) made of an elastomeric material and sleeved around the piston engaging portion between the piston rod and piston head. The piston rod and piston head are formed separately and then assembled together. The piston engaging portion (15) is composed of a piston-engaging-portion formation part of at least one of the piston rod and the piston head. The invention also provides a method of manufacturing the piston assembly (10). The invention further provides a piston assembly (10) for a liquid pump. The piston assembly has a piston (13) which is provided with an annular notch (133) formed on the periphery of an upper end of the piston (13) where an annular inner flange (131) is formed.

Abstract: A plunger for axial movement and rotation within a pump barrel of a fuel pump comprises a substantially cylindrically shaped plunger shaft made of a ceramic material, and at least one control element for controlling a rotational angle of the plunger. The at least one control element is attached to the plunger shaft.

Abstract: A primary piston of molded plastic material equipped with a metallic insert and having grooves, mounted in a master cylinder comprising at least a primary piston and a secondary piston mounted in the bore hole of the master cylinder. These pistons can create pressure, respectively, in a primary pressure chamber and in a secondary pressure chamber due to the action of a push rod on the primary piston.

Abstract: A system, in certain embodiments, includes a composite piston. The composite piston comprises a piston body made of a composite material, wherein the composite material comprises a reinforcing material distributed in a matrix material.

Abstract: A master cylinder includes at least one primary piston and one secondary piston installed in the bore hole of the master cylinder, which pistons are used to create pressure. The primary piston has a body of molded plastic material and is equipped with a functional metallic insert which has the shape of a spherical cap capable of accommodating a push rod.

Abstract: A primary piston is described of molded plastic and equipped with a functional metallic insert and at least one groove. The primary piston is installed in a master cylinder comprising at least the primary piston and a secondary piston, these being mounted in the bore hole of a master cylinder. These pistons can create pressure in a primary pressure chamber and a secondary pressure chamber, respectively, due to the action of a push rod on the primary piston.

Abstract: A brake piston may include a steel core and a phenolic outer layer that may be overmolded to the steel core.

Abstract: The present invention generally relates to the field of toilet seats, and in particular, self actuating toilet seat and toilet seat lid assemblies which silently close after use. More particularly, the present invention generally relates to a piston and cylinder designs.

Abstract: A multi-layer brake pad assembly includes a layer of friction material, a layer of thermal insulating material, and a backing plate. The thermal insulating material is a fiber reinforced ceramic matrix composite with a high fracture toughness and low thermal conductivity that is disposed between the friction material and the backing plate and restricts the heat flow transmitted through the backing plate into the hydraulic fluid during severe braking, thereby minimizing the onset of brake loss due to hydraulic fluid vaporization as a result of overheating.

Abstract: Pump engines made of recyclable materials and offering a metal free fluid or product flow path include precompression means for applying precompression forces to a fluid being distributed thereby.

Abstract: A piston for a radial piston machine includes a metal core that is substantially provided with a casing made of plastic. The casing is configured to be produced from PEEK together with a bearing shell as one piece and injection-molded onto the core.

Abstract: A pneumatic component includes a cylinder, a piston running in the cylinder, and a grooved ring. The grooved ring seals the piston from the cylinder, and has a static side and a dynamic side. The static side of the grooved ring has at least two concentric microlips.

Abstract: A lubricant pump includes a housing in which at least one pair of intermeshing gear wheels is arranged for conveying lubricant. One gear wheel is rotatably supported on a drive shaft and the other gear wheel is rotatably supported on an axially shiftable displacement unit for adjusting a variable flow volume. Axially displaceable in a housing receptacle is a control piston for hydraulically adjusting the position of the displacement unit. The control piston is configured as composite structural part and has a central longitudinal shaft and cylinder rings which include control edges for clearing or closing control channels feeding into the receptacle. The cylinder rings are made from a material which reduces friction and/or wear with respect to the receptacle, and the central longitudinal shaft has at least one section made from a material having a coefficient of thermal expansion at least substantially corresponding to the one of the receptacle.

Abstract: A device and a piston for segregating articles is being disclosed. The device encompasses a segregating element comprising at least one cylinder with a cylinder housing and a piston installed in the cylinder that has at least one valve. A medium can be fed into and discharged from the cylinder via at least one line. The at least one valve interacts with the at least one line so as to create a hard sealing, and a housing sealing element interacts with a piston sealing element so as to create a hard sealing. The piston can used in a device for segregating liquid containers.

Abstract: A two-stage GM cryogenic refrigerator includes a displacer having a low-temperature side and a high-temperature side and a motor configured to drive the displacer. The motor is configured to be rotatable forward in cooling and backward in increasing a temperature. The cryogenic refrigerator further includes a resin provided on an outer circumferential surface of the displacer. A thickness of the resin is thinner on the high-temperature side than on the low-temperature side.

Abstract: A piston for an engine generator, comprising alternating laminated core elements and non-magnetising spacer elements arranged along a piston shaft and secured such that contact is maintained between neighbouring elements, wherein the length of the piston is at least at least five times its maximum diameter.

Abstract: The present invention relates to a hydraulic system that includes a compression chamber capable of being subjected to the pressure of a hydraulic fluid; a piston movable inside the compression chamber along an axis; and at least one sealing gasket disposed between the piston and a wall of the compression chamber, the gasket occupying an axial position that varies circumferentially around the axis in such a manner as to compensate for non-axially symmetrical stresses induced by the pressure of the fluid.

Abstract: A piston accumulator includes a housing having a housing wall and a piston disposed in the housing. The housing wall and the piston form a pressure chamber. The piston is slidably moveable along the housing wall so as to change a volume of the pressure chamber. A slide layer disposed on at least one of the piston and the housing wall is configured to guide the piston free of guide rings.

Abstract: A piston for an internal combustion engine has at least two hub bores for holding a piston pin. The hub bores are formed with a cylindrical inner contour and are provided with a coating comprising a resin with solid lubricant particles embedded therein. The coating forms at least one geometric deviation from the cylindrical inner contour of the hub bores. A method for producing a piston of the type, includes producing bores with a cylindrical inner contour and applying a coating medium comprising a resin with solid lubricant particles embedded therein to the inner faces of the bores by a coating tool, such that the resulting coating forms at least one geometric deviation from the cylindrical inner contour of the hub bores.

Abstract: A piston for an internal combustion engine wherein the piston includes a piston body fabricated from a metal and a piston head fabricated from a ceramic or ceramic composite material, the ceramic or ceramic composite piston head is press fit to the piston body and secured by an internal circumferential locking ring.

Abstract: In a method for molding a resin piston by charging a preheated resin tablet into a cavity of a molding die, and by carrying out compression molding while heating, at a time point when an internal pressure of the cavity arrives at a determined pressure, by pressurizing a pressurizing margin in the molding die, resin which overflows from the molding die is discharged from a passage which is defined in an area except an outer circumferential surface of the piston, while the internal pressure of the cavity is maintained. After a thermosetting cycle has finished, the molding die 21 is opened.

Abstract: A piston device and its manufacturing method are disclosed. The piston device comprises a piston body having at least one annular groove on the side wall of the piston body, and at least one piston ring made of flexible material and mounted in the annular groove. The outer diameter of the piston ring mounted on in the annular groove is larger than the diameter of the piston body, so that the piston ring contacts with the inner wall but the piston body has no contact with the inner wall while the piston device moves reciprocally at the axial direction of the cylinder.

Abstract: A piston-type internal combustion engine is formed of a high performance synthetic resin material. The cylinders and pistons have an octagonal profile. Two or three rows of pin roller bearings are positioned in transverse semi-cylindrical grooves formed on the cylinder walls, to afford smooth, low-friction rolling contact and to seal the compression from leaking around the piston. There are angle support pieces fitted within the annular channels at respective vertices or corners, and are adapted for rotationally supporting the ends of adjacent pin roller bearings.

Abstract: A piston for an internal combustion engine includes a piston base material and a film of lubrication coating composition. The coating composition has an inner coating layer formed on a surface of the piston base material and an outer coating layer formed on a surface of the inner coating layer. Each of the inner coating layer and the outer coating layer contains at least one of a polyamide-imide resin, a polyimide resin and an epoxy resin as a binder. The inner coating layer contains 0 to 50 wt % of at least one of graphite and molybdenum disulfide as a solid lubricant, whereas the outer coating layer contains 50 to 95 wt % of at least one of graphite and molybdenum disulfide as a solid lubricant.

Abstract: The invention relates to a pneumatic component with a cylinder (12); a piston (14) running in the cylinder and a grooved ring (16), which seals the piston (14) from the cylinder (12) and has a static side (Sstat) and a dynamic side (Sdyn). According Co the invention, the grooved ring (16) has at least two concentric microlips (38) on the static side (Sstat).

Abstract: A pump system includes at least one pressure chamber at least partially defined by a helical bellows plunger comprised of a tubular body, a closed front portion, an open rear portion, and at least one contour extending continuously as a helix, longitudinally from proximate the front portion to proximate the rear portion. Methods for forming a helical bellows plunger include molding the helical bellows plunger using a mold core comprising a helically extending exterior contour and a cooperatively associated mold cavity comprising a helically extending interior contour of substantially a same pitch and configured to align with the helically extending exterior contour of the mold core, introducing a molding material therebetween, curing the molding material, and unscrewing the cured molding material from the mold core. Various configurations of helical bellows plungers are also disclosed.

Abstract: The invention includes a piston having a piston body (1) and front seal for sealing the gap between the side wall of the piston body and the wall of a chamber within which the piston and a material are disposed in a conventional manner. The front seal (5) has a leading edge (6) included angle (A) as defined below, and a trailing edge (7) included angle (B) that is smaller than the leading edge included angle. By the appropriate selection of these two angles, the force required to move the piston (and thus the material) is optimized, the force required to move the piston (and thus the material) is optimized, which results in a more useful dispenser than conventional syringe-type dispensers. These and other features of the present invention are described in greater detail below.

Abstract: Provided is a low friction, self-lubricating sleeve for use with a reciprocating piston in the compressor and/or the expander subsystem of a cryogenic cooler or other compressor type system. The sleeve is bonded to an outer surface of the piston, thereby positioning the sleeve between the piston and an inner wall of a piston cylinder. The sleeve is manufactured using a polyetheretherketone base material, as well as varying percentages of carbon and/or polytetrafluoroethylene fillers. The sleeve may include a dry lubricant such as graphite or molybdenum disulfide, and may extend for all or part of the length of the piston. The sleeve demonstrates negligible wear over thousands of hours of use in the cryogenic cooler, thereby minimizing system gas blow-back and maximizing system efficiency/performance.

Abstract: The present invention relates to a piston-cylinder unit with a piston with adjoining piston rod, which is movably mounted in a cylinder, wherein the piston and the piston rod have a cavity into which at least one rod protrudes, by means of which an electrically conductive connection can be made directly or indirectly.

Abstract: The invention relates to a piston ring whose running surface is provided with a coating containing a plastic material. Said piston ring is characterized in that the coating is composed of at least one polyamide-imide and/or at least one polyether ether ketone with embedded particles which can be embodied as hard material particles, solid lubricant particles, or metallic particles. The invention further relates to a piston/piston ring arrangement comprising at least one inventive piston ring and an agent for coating at least the running surface of the piston ring.

Abstract: A piston arrangement includes a piston which is pin-ointed to a sliding block. The sliding block is molded directly onto the piston by injection molding so that no separate process step is required. The piston itself is part of the injection mold, an extremely precise fit can be guaranteed in the hinging area of the sliding block to the piston, which fit permits a reliable connection even when the piston surface is located in the connecting area outside the given tolerance, because by directly molding the sliding blocks onto the piston the tolerances are compensated.

Abstract: A composite piston (10) for a motor vehicle transmission comprises a support body (14) and at least one rotationally symmetric annular seal comprising an elastomer sealing lip (16, 17) interacting in a sealing manner with a component (11, 12) forming a cylindrical sliding surface (21, 23), wherein the composite piston (10) can be displaced translationally relative to the component (11, 12) forming the cylindrical sliding surface. The annular seal comprises an elastomer annular bead (20, 22) displaced axially relative to the sealing lip (16, 17), wherein the annular bead is arranged to have a distance d1, d2 from the sliding surface (21, 23) in the non-loaded state larger than or equal to zero.

Abstract: A pressure cylinder comprises a cylinder housing with a cylinder space in which a fitting piston is axially movable. A piston rod (1) of a composite material extends from the piston. The piston rod (1) comprises a layer of core material under a surrounding outer jacket. The layer of core material (3) is constructed from composite material fibres oriented parallel to a longitudinal axis of the piston rod and straightened, and the outer jacket (5) is constructed from composite material fibres wound at an angle relative to the longitudinal axis. Thus provided is a pressure cylinder with a piston rod (1) of relatively light weight, which can withstand a relatively high pressure load. Less composite material is hereby required for the piston rod (1) while the strength remains the same.

Abstract: An injection molded piston formed integrally of polymer material includes a body extending along an axis and providing a mounting surface, first and second partial cylindrical surfaces located above the mounting surface and formed with a concave recesses, a first shoe located above the mounting surface and radially outboard of the cylindrical surfaces, and a second shoe located above the mounting surface and radially outboard of the cylindrical surfaces.

Abstract: An upper part (1) of an assembled piston is disclosed, comprising a radially directed inner contact surface (2) arranged on the underside of an annular rib (15) and a radially directed outer contact surface (3) arranged on the underside of an annular wall (25), the outer (3) and the inner contact surface (2) each having a grooved profile in the form of concentric grooves with an average depth between Rz 10 and Rz 30. The wear on the contacting surfaces of the upper piece and the lower piece of the assembled piston is thus reduced.

Abstract: A powder-metallurgically produced piston body for a piston-cylinder arrangement, in particular a shock absorber piston, has a one-part piston body, a revolving or circumferential web that protrudes radially outwardly from outer surface of the piston body, longitudinal webs, and at least one traverse groove. A collar-shaped seal, made of thermally deformable material, is formed onto the piston body such that the revolving or circumferential web and the support webs are formed into the seal over at least a part of their heights.

Abstract: An oil-less/oil-free air brake compressor comprising a bore, a piston positioned for reciprocating in the bore, the piston having an annular recess and a rigid polymeric piston ring received within the annular recess, the piston ring having a predetermined non-circular profile in the free state.

Abstract: A piston includes a piston body, an elastic adhesive layer, and a low thermal-conductivity sheet. The piston body has a piston top surface facing a combustion chamber, and exhibits a first thermal conductivity. The elastic adhesive sheet is formed on the piston top surface of the piston body, and includes a heat resistant resin. The low thermal-conductivity sheet is formed on the elastic adhesive layer, and exhibits a second thermal conductivity being lower than the first thermal conductivity of the piston body and falling in a range of from 5 or more to 40 W/m·K or less.

Abstract: The invention relates to a piston-type accumulator comprising a separating piston (24), which can be axially displaced inside an accumulator housing (10) and which separates two spaces from one another inside the accumulator housing (10), particularly a gas side (22) from a liquid side (20) of the accumulator. Due to the fact that the separating piston (24) is predominantly or completely made of a plastic material, it can be provided with a very light weight whereby reducing the overall installation weight of the piston-type accumulator.

Abstract: A piston adapted for use in offset mounting conditions includes a piston body having a longitudinally-extending axis. First and second securement features are located at radially outer positions relative to the axis. The first and second securement features are also located on one diametrical side of a midplane of the piston body. A plurality of support walls extends from the diametrically opposite side of the piston body toward the securement features. A gas spring assembly including such a piston is also included.

Abstract: A hydraulic piston apparatus includes a piston having a piston body movable along an axis, the piston body having a substantially cylindrical shape, a radius, and an outer wall extending substantially parallel to the axis, the outer wall having at least one portion that defines a cavity having a first width and a second width, the second width being greater than the first width and disposed radially inward from the first width. The cavity is configured to apply a retaining force to an attachment during use.

Abstract: A piston 1 which is to be movably supported in a cylinder 11 of a pump 10 to be reciprocally driven is formed by a fluororesin so that it is not impaired by a corrosive liquid. A cylindrical outer peripheral portion 2 of the piston 1 has a thickness of 1 mm or less, and is flexible. The outer peripheral portion has a flange portion 7 in an open end portion via an approximately 180-degree folded-back portion 3. The flange portion 7 is attached to the cylinder 11. When the pump 10 is driven, the cylindrical outer peripheral portion 2 of the piston 1 smoothly rolls without producing deflections or bends in a gap between the outer peripheral face of a piston support member 15 and the inner peripheral face of the cylinder 11, while being in close contact with the two faces.

Abstract: An adjustable piston pump for displacement and extraction of remnant from soft sand and or soft soil includes a pump casing cylinder that is capped at one end and opens at the other end. It includes a handle fixed to the pump casing cylinder, a shaft rod, a shaft rod handle and a piston that includes a flexible ball. The shaft rod is retractable through the center of the capped end of the pump casing cylinder and is connected to a shaft rod handle. The portion of the shaft rod that always remains embodied in the pump casing cylinder is connected to a piston. The flexible ball mounted inside the piston construction is compressed or decompressed by the clockwise or counter clockwise rotation of the handle located at the other end of the shaft rod. Pressure is controlled in this manner. Upward and downward strokes of the piston initiate displacement and extraction of remnant.