Abstract: A high pressure pump comprising a fluid end mechanically coupled to a power end. The power end is modular and comprises a crankshaft section, a crosshead section, and a connector section coupled together by a first set of stay rods. The fluid end comprises a plurality of fluid end sections positioned in a side-by-side relationship. Each of the plurality of fluid end sections are attached to the power end using a plurality of second set of stay rods.

Abstract: A piston (1) having a piston shaft (2), a ball head (3) at one end of the piston shaft (2), and a slider shoe (4) mounted to the ball head (3), wherein the ball head (3) has a through channel (5), the slider shoe (4) has a sliding surface (6) and a through hole (7) in communication with an end of the through channel (5), and a plastic material (8) is arranged in a gap between the slider shoe (4) and the ball head (3) and forms an inner coating (9) of the through hole (7). The production of such a piston should be facilitated. To this end a sealing surface (14) is arranged at the end of the through channel (5) wherein the sealing surface (14) surrounds the opening of the through channel (5) into the through bore (7) and an inner diameter of the sealing surface (14) is smaller than an inner diameter of the inner coating (9) of the through bore (7).

Abstract: A vibration damper may include a damper tube filled at least partially with damping liquid. A piston rod is movable to and fro in the damper tube. A working piston is movable with the piston rod by way of which working piston an interior space of the damper tube is divided into two spaces. The vibration damper may have a wedge element and a bracing element, and the piston rod may have a wedge element recess for partially receiving the wedge element. The wedge element may be arranged in the at least one wedge element recess in a braced state, and the at least one bracing element may be connected to the working piston such that the bracing element braces the working piston with respect to the piston rod via the wedge element arranged in the element recess.

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 piston pump includes a piston assembly which has a first piston element, a second piston element, and at least one transverse bore which corresponds to a longitudinal bore. The piston pump further includes a cylinder in which the piston assembly is guided in a longitudinally movable manner, and an inlet valve which includes a cage element, in which an inlet valve spring and sealing element are arranged, and a corresponding inlet valve seat which is arranged on the piston assembly. The inlet valve sealing element can be pressed sealingly into the corresponding inlet valve seat by means of a restoring spring in order to close off the longitudinal bore. The second piston element is configured as a sleeve made of a wear-resistant material, which accommodates axially acting power components. The inlet valve seat is disposed on a bending edge of the second piston element configured as a sleeve. The at least one transverse bore corresponding to the longitudinal bore is placed in the second piston element.

Abstract: According to one embodiment, there is provide a piston pump, including: a cylinder having a bottomed cylindrical shape; a piston slidable within the cylinder, the cylinder and the piston defining a pressure chamber therebetween; a suction valve unit disposed in a suction passage of the pressure chamber; and a discharge valve unit disposed in a discharge passage of the pressure chamber, wherein the piston includes a cylindrical piston portion and a large diameter piston portion provided to cover one end of the cylindrical piston portion, and wherein the large diameter piston portion includes a working fluid guide groove extending thereinside along the axial direction of the piston.

Abstract: The invention relates to a two-part piston (1) for an internal combustion engine, consisting of an upper part (2) and a lower part (3) which is screwed to the upper part. The upper part (2) and the lower part (3) are in contact with each other, partially by means of inner bearing surfaces (25, 26) defining the lower side of an upper ring rib (10) and the upper side of a lower ring rib (11), and partially by means of outer bearing surfaces (28, 29) defining the lower side of the ring wall (9) and the upper side of a collar (27) applied to the lower part (29). In order to avoid frictional rubbing, frictional heat sealing and pressure-related material heat sealing, at least one of the bearing surfaces (25, 26, 28, 29) is easily and economically provided with a chrome layer (30) which has a structured surface comprising a plurality of raised parts and recesses.

Abstract: A piston has a piston body extending along a central axis. The piston body has an upper crown portion and a lower crown portion. The upper crown portion has an upper combustion wall and an at least one annular upper rib depending from the upper combustion wall to a free end. The lower crown portion has at least one annular lower rib extending to a free end that is fixed to the at least one upper rib and an inner gallery floor extending radially inwardly relative to the at least one lower rib. The upper crown portion has an upper post depending from the upper combustion wall along the central axis to a free end. The lower crown portion has a lower post extending upwardly from the inner gallery floor along the central axis to a free end. Together, the upper post and the lower post form a labyrinth passage.

Abstract: The present invention relates to a piston (10, 110, 210) for an internal combustion engine, comprising a piston crown (13), a circumferential ring part (16), a circumferential cooling channel (27) arranged in the vicinity of the ring part (16), boss supports (21) connected below the piston crown (13), piston bosses (18) connected thereto, and a piston skirt (17). According to the invention, a cavity (28) closed on all sides and having a closure element (29, 129, 229) arranged in the direction of the piston skirt (17) is provided below the piston crown (13).

Abstract: A metal plunger tip has a forward generally cylindrical section having a leading relatively flat forward end and enlarging at its rearward end to a first land. A middle generally circular threaded section spans between the first land and a second generally larger land at its rearward section. A rearward generally cylindrical section of larger diameter spans between the second land a its rear surface that terminates with a section for attachment to an externally threaded push rod. There is an interior cooling cavity in the plunger tip terminating with a rear internally threaded section for mating with an externally threaded push rod. The metal plunger tip can be made from beryllium copper. The metal plunger tip may have a leading chamfered edge. A metal wear ring can be screwed onto the metal plunger tip.

Abstract: A hydraulic cylinder includes a piston unit inside a cylinder to be free to slide within the cylinder; and a piston rod having the piston unit fixed to one end thereof and another end thereof projecting from the cylinder. The piston unit is inserted into a small diameter portion of the piston rod with an end surface thereof fixedly contacting a shoulder end surface of the piston rod. A round portion is formed as an annular concave in a base end portion outer periphery of the small diameter portion of the piston rod. A tapered portion is formed on an inner periphery of the piston unit from the end surface in alignment with a portion formed by concaving the small diameter portion. A length of the tapered portion in a piston unit axial direction is equal or greater than a length of the concave portion in a piston rod axial direction.

Abstract: A system for moving fluids includes a pump device having a housing and at least one piston movable in the housing to displace fluids thereby causing flow. An actuator device is connected to the at least one piston for moving the piston within the housing to displace fluids as the actuator device is moved. The actuator device includes a plurality of side portions connected to one another to form a vacuum therein and movable relative to one another as the actuator device moves reciprocally between first and second positions with one of the side portions being connected to at least one piston thereby moving the at least one piston within the housing.

Abstract: A piston portion (102) for a piston assembly (100) is provided according to an embodiment of the invention. The piston portion (102) includes a substantially cylindrical head portion (103) including a mating face (105). The piston portion (102) further includes a substantially annular insert chamber (126) formed in the mating face (105) and adapted for receiving a portion of a substantially annular insert (120).

Abstract: A method and apparatus for simultaneously producing a first piston part and a second piston part via a forging device may include an upper die, at least one intermediate die, and a lower die. A first billet may be placed between the upper die and the intermediate die, and a second billet may be placed between the intermediate die and the lower die. The upper die and the lower die may be configured to be moved toward each other, whereby the first piston part is forged from the first billet and the second piston part is forged at the same time from the second billet. The upper die and the lower die may then be configured to be moved apart, and the piston parts may be removed.

Abstract: The present invention relates to a tool for screwing a piston onto the piston rod of a hydraulic cylinder, in particular of a hydraulic cylinder with a piston diameter of more than 200 mm, comprising a first tool element with connecting elements for releasable connection with the piston and a second tool element with connecting elements for releasable connection with the piston rod, which is rotatable with respect to the first tool element, wherein the torque necessary for screwing together piston and piston rod can be applied onto the piston and the piston rod via the connecting elements by rotating the first tool element against the second tool element.

Abstract: The invention relates to a force transfer system comprising a hydraulic cylinder (1) comprising a piston (10) which can be impinged with hydraulic fluid and a thrust bearing (2) which is in operative contact with the piston, said bearing comprising a first and a second glide surface for exerting a sliding motion. The thrust bearing comprises a pressure space (25) which is connected to the side of the piston (10) impinged with hydraulic fluid by way of at least one hole (11) made in the piston.

Abstract: An actuator includes a first piston and a second piston. The first piston has a piston ring that separates a first chamber from a second chamber of the actuator. The first piston has an interior chamber that communicates with the first chamber. The second piston is disposed within the interior chamber of the first piston so as to be movable with respect thereto. The second piston has a surface that interfaces with the second chamber.

Abstract: The invention relates to a hydraulic cylinder piston comprising a piston rod and a piston connected thereto. In accordance with the invention, the piston can be tensioned with respect to the piston rod via a screw system comprising two threaded rings, with the inner threaded ring of the two threaded rings comprising a removable tensioning element for the application of the pre-tension and with the outer threaded ring being movable relative to the inner threaded ring.

Abstract: A detachable connecting rod includes a first member (410)a large end portion (411) having a trough hole (H1), and a first connection rod portion (412) extending from the large end portion (411), the first connection rod portion (412) having a pair of spaced apart arms defining a coupling groove (413) extending in the same direction as an axial direction of the through hole (H1); a second member (420) including a small end portion having a through hole (H2), and second connection rod portion (422) extending from the small end portion, the second connection rod (422) portion being inserted into the coupling groove (413) and a coupling unit for coupling the first connection rod portion (412) to the second connection rod portion inserted (412) into the coupling groove (413) of the first member (410). The detachable connecting rod is useable in a compressor.

Abstract: An improved follower packing unit for a grease gun is disclosed. The unit includes a hollow annular body of elastomeric material having a front wall, an annular side wall and a rear wall defining a cavity in the body. Rigid front and back structural supports rigidly support the front and rear walls of the elastomeric seal. The elastomeric seal and the front and back structural supports are fastened together to prevent separation and to form a unitary follower structure movable as a unit on a follower rod. The annular side wall of the elastomeric seal is resiliently deformable under pressure in a radial direction for sealing tightly against an interior surface of the barrel of the grease gun or against the interior surface of a tubular cartridge loaded in the barrel of the gun.

Abstract: A piston and cylinder unit (1) includes a cylinder housing (2), a piston (7), a piston rod (18) and a securing element (20). The piston (7) includes an opening (13), at least one piston seal (11) and an inner thread (15) being located in the opening (13). The piston rod (18) has an axis (9) and includes a protrusion (21), an outer thread (23) and a second thread (27). The outer thread (23) is located on the protrusion (21). The second thread (27) is located at the piston rod (18). The piston (7) and the piston rod (18) are connected by the inner thread (15) and the outer thread (23). The securing element (20) is designed and arranged to substantially extend in the direction of the axis (9). The securing element (20) includes a thread (24), the securing element (20) and the piston rod (18) being connected by the thread (24) of the securing element (20) and the second thread (27) of the piston rod (18).

Abstract: An assembled two-part piston, comprising: a piston upper part and a piston lower part, wherein a screw thread connects the piston upper part to the piston lower part.

Abstract: A plunger assembly including a pony rod adapter, a plunger releasably attached to the pony rod adapter, and a pony rod being releasably attached to the pony rod adapter. The pony rod adapter has a first cylindrical body and a number of apertures penetrating the first cylindrical body for receiving a lever. A first helically threaded pin is affixed to the first cylindrical body and projects from one of its ends. A second helically threaded pin is affixed to the first cylindrical body and projects from the other of its ends. The plunger has a second cylindrical body for reciprocating within a pumping chamber. The second cylindrical body has a first outer end with a first helically threaded bore for threadably receiving the first helically threaded pin. The second cylindrical body also has a first inner end with a polygonal socket for receiving a plunger key. The pony rod has a third cylindrical body for reciprocating into, and out of, the power end of a pump.

Abstract: A method for producing a piston for internal combustion engines includes the following steps: a first part is pre-fabricated by hot forging and a recess which has an undercut is formed in the first part during pre-fabrication by forming on the first part a projection, to which projection a lateral force is applied to form the undercut; a second part is pre-fabricated by hot forging and a projection is formed on this second part whose dimensions are matched to the dimensions of the recess; the two parts are joined together so that the projection on one part engages in the recess in the other part; and a compressive force is applied to the two parts which is sufficiently large and so aligned that the material of the projection on one part flows into the recess in the other part and completely fills it to connect the parts by positive fit.

Abstract: A plunger assembly including a pony rod adapter, a plunger releasably attached to the pony rod adapter, and a pony rod being releasably attached to the pony rod adapter. The pony rod adapter has a first cylindrical body and a number of apertures penetrating the first cylindrical body for receiving a lever. A first helically threaded pin is affixed to the first cylindrical body and projects from one of its ends. A second helically threaded pin is affixed to the first cylindrical body and projects from the other of its ends. The plunger has a second cylindrical body for reciprocating within a pumping chamber. The second cylindrical body has a first outer end with a first helically threaded bore for threadably receiving the first helically threaded pin. The second cylindrical body also has a first inner end with a polygonal socket for receiving a plunger key. The pony rod has a third cylindrical body for reciprocating into, and out of, the power end of a pump.

Abstract: The object of the present invention is a piston for cold chamber die-casting machines comprising a body and at least one sealing band mounted around said body, wherein said body and said band are provided with coupling means suitable for concurrently obtaining both an angular locking and an axial locking of the band to the piston body.

Abstract: A two-stroke internal combustion engine has at least one cylinder having a bore diameter, a piston slip-fit in the cylinder, the piston having an upper portion and a lower portion and a central portion of significantly less than the bore diameter, providing an annular space between the central portion and the cylinder wall, and an air pump providing air to one or more intake ports, wherein for a significant portion of every stroke both one or more exhaust ports and the one or more intake ports are open to the annular space between the central piston portion and the cylinder wall, allowing the air pump to force air from the one or more intake ports around the central piston portion to the one or more exhaust ports.

Abstract: The invention relates to a two-part piston (1) for an internal combustion engine, consisting of an upper part (2) and a lower part (3) which is screwed to the upper part. The upper part (2) and the lower part (3) are in contact with each other, partially by means of inner bearing surfaces (25, 26) defining the lower side of an upper ring rib (10) and the upper side of a lower ring rib (11), and partially by means of outer bearing surfaces (28, 29) defining the lower side of the ring wall (9) and the upper side of a collar (27) applied to the lower part (29). In order to avoid frictional rubbing, frictional heat sealing and pressure-related material heat sealing, at least one of the bearing surfaces (25, 26, 28, 29) is easily and economically provided with a chrome layer (30) which has a structured surface comprising a plurality of raised parts and recesses.

Abstract: The piston 4 comprises a fixing ring 8 mounted on a piston rod 6, and a piston body 10 fixed to the fixing ring 8. The fixing ring 8 is comprised of two semi-circular plated members 8A, 8B having plural threaded holes 8a for bolt-fastening of the piston body 10. When they are abutted against each other and formed into a circular-annular shape, a hole portion 8c which is to be tightly fitted in a fixing groove 6a of the piston rod 6 is formed. The piston body 10 has a hole portion 10a which is to be fitted over the piston rod 6, and plural bolt holes 10c corresponding to the threaded holes 8a. Moreover, the piston body 10 has a concave portion 10d on a side of one surface thereof, in which the fixing ring 8 is fitted in an embedded state.

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: The present invention relates to a tool for screwing a piston onto the piston rod of a hydraulic cylinder, in particular of a hydraulic cylinder with a piston diameter of more than 200 mm, comprising a first tool element with connecting elements for releasable connection with the piston and a second tool element with connecting elements for releasable connection with the piston rod, which is rotatable with respect to the first tool element, wherein the torque necessary for screwing together piston and piston rod can be applied onto the piston and the piston rod via the connecting elements by rotating the first tool element against the second tool element.

Abstract: A method for producing a piston for internal combustion engines includes the following steps: a first part is pre-fabricated by hot forging and a recess which has an undercut is formed in the first part during pre-fabrication by forming on the first part a projection, to which projection a lateral force is applied to form the undercut; a second part is pre-fabricated by hot forging and a projection is formed on this second part whose dimensions are matched to the dimensions of the recess; the two parts are joined together so that the projection on one part engages in the recess in the other part; and a compressive force is applied to the two parts which is sufficiently large and so aligned that the material of the projection on one part flows into the recess in the other part and completely fills it to connect the parts by positive fit.

Abstract: A piston portion (102) for a piston assembly (100) is provided according to an embodiment of the invention. The piston portion (102) includes a substantially cylindrical head portion (103) including a mating face (105). The piston portion (102) further includes a substantially annular insert chamber (126) formed in the mating face (105) and adapted for receiving a portion of a substantially annular insert (120).

Abstract: Pistons for use in a dispensing cartridge, as well as cartridge systems including such pistons. The piston may include a body having a generally cylindrical configuration with a sidewall and a sealing lip extending outwardly from the sidewall. The sealing lip has a first portion dimensioned to have a first flexibility, a second portion dimensioned to have a second flexibility greater than the first flexibility, a sealing edge terminating the second portion, and a sealing bead positioned between the first portion and the sealing edge of the second portion, and the second portion configured to deflect relative to the first portion such that the sealing edge and the sealing bead have a contacting relationship with an inner wall of the cartridge when the piston is inserted into the cartridge. The sealing edge and sealing bead cooperate to prevent leakage during storage and to prevent blow-by during use.

Abstract: The invention relates to an assembled piston (1) for an internal combustion engine, said piston consisting of an upper part (4) provided with a combustion cavity (8), and a lower part (5) that is screwed to the upper part (4) by means of a screw (6) which is arranged coaxially to the piston axis (31). Said screw (6) is embodied as a set screw comprising a hexagon socket (6?) on the inner side of the piston and a head (6?) on the bottom side of the piston, the head (6?) forming part of the bottom of the combustion cavity (8) and being flush therewith (8) in the screwed state.

Abstract: The invention relates to a hydraulic cylinder piston comprising a piston rod and a piston connected thereto. In accordance with the invention, the piston can be tensioned with respect to the piston rod via a screw system comprising two threaded rings, with the inner threaded ring of the two threaded rings comprising a removable tensioning element for the application of the pre-tension and with the outer threaded ring being movable relative to the inner threaded ring.

Abstract: A two-part piston for an internal combustion engine comprising an annular outer piston connected to the crankshaft by two connecting rods and an inner piston fit into the bore of the annular outer piston connected to the crankshaft by one connecting rod. The reciprocating motion of the inner and annular outer piston is controlled by the location of the respective connecting rod bearing journals on the crankshaft.

Abstract: A hydraulic linear drive, particularly a hydraulic transmission actuator, having a piston/cylinder unit, in which an actuating piston longitudinally displaceably arranged in the cylinder housing divided into at least two pressure chambers which can be acted upon by hydraulic oil by way of control conduits. A piston rod is connected with the actuating piston, and a sealing element is arranged on the actuating piston to seal off the two pressure chambers from one another. The actuating piston has a two-piece construction and consists of a first and a second piston part between whose facing faces, a sealing element is arranged.

Abstract: A piston head of a hydraulic injection molding machine is screwed with a tie rod inside a hydraulic cylinder of the hydraulic injection molding machine. The piston head has a second screw formed in an inner circumference of a hollow of the piston head and engaged with a first screw formed in an outer circumference of the tie rod. An insert groove having a predetermined shape is formed in the inner circumference of the piston head in front of the second screw.

Abstract: The object of the present invention is a piston for cold chamber die-casting machines comprising a body and at least one sealing band mounted around said body, wherein said body and said band are provided with coupling means suitable for concurrently obtaining both an angular locking and an axial locking of the band to the piston body.

Abstract: A piston and cylinder unit (1) includes a cylinder housing (2), a piston (7), a piston rod (18) and a securing element (20). The piston (7) includes an opening (13), at least one piston seal (11) and an inner thread (15) being located in the opening (13). The piston rod (18) has an axis (9) and includes a protrusion (21), an outer thread (23) and a second thread (27). The outer thread (23) is located on the protrusion (21). The second thread (27) is located at the piston rod (18). The piston (7) and the piston rod (18) are connected by the inner thread (15) and the outer thread (23). The securing element (20) is designed and arranged to substantially extend in the direction of the axis (9). The securing element (20) includes a thread (24), the securing element (20) and the piston rod (18) being connected by the thread (24) of the securing element (20) and the second thread (27) of the piston rod (18).

Abstract: A split displacer piston assembly (1) in conjunction with a Stirling engine is disclosed. Said assembly comprises of two main parts, displacer dome (8) and displacer base (9). Within the displacer dome there are several heat shields (10). The displacer base has a piston ring assembly (12) installed in an outer perimeter groove and fixed between the displacer base and displacer dome is a displacer guide ring (11). In order to service and or replace these parts rapidly, the displacer dome and displacer base are fastened by threaded engagement.

Abstract: A method and apparatus for a reciprocating pump, specifically, a single acting fluid or slurry pump piston. The piston assembly includes a reserve seal that is operable and adapted to maintain a pump operation in the event of a primary piston seal failure. The reserve seal allows the communication of the primary piston seal failure to a pump operator or worker so that they may take timely remedial measures, thereby avoiding the numerous consequences of a complete piston failure. The piston assembly includes an indicator that is adapted to communicate to the pump operator or worker that the primary piston seal has failed.

Abstract: A piston, such as a cooling channel piston of an internal combustion engine, has a first part, a second part and a third part. The parts can be produced separately from each other and subsequently assembled by way of a joining method. The third part has at least one rotationally symmetrical joining area disposed in direction of the first part, and, another rotationally symmetrical joining area disposed at least in the direction of the second part. The joining areas mate with joining areas of the first part and the second part.

Abstract: The piston 4 comprises a fixing ring 8 mounted on a piston rod 6, and a piston body 10 fixed to the fixing ring 8. The fixing ring 8 is comprised of two semi-circular plated members 8A, 8B having plural threaded holes 8a for bolt-fastening of the piston body 10. When they are abutted against each other and formed into a circular-annular shape, a hole portion 8c which is to be tightly fitted in a fixing groove 6a of the piston rod 6 is formed. The piston body 10 has a hole portion 10a which is to be fitted over the piston rod 6, and plural bolt holes 10c corresponding to the threaded holes 8a. Moreover, the piston body 10 has a concave portion 10d on a side of one surface thereof, in which the fixing ring 8 is fitted in an embedded state.

Abstract: A multi-part piston for a combustion engine having a piston upper part and a piston lower part, where the piston upper part has a piston crown and an attachment head on its side facing the piston lower part, and the piston lower part has an attachment element in which the attachment head is held, the attachment element being disposed on a side facing the piston upper part. The attachment head is held in the attachment element by a press fit.

Abstract: A pair of recesses is formed on a cylinder hole of a cylinder tube, wherein the recesses are recessed further into the cylinder hole from an inner circumferential surface thereof. Projections that correspond to the recesses are disposed on a head cover and a rod cover, respectively, which are installed into both ends of the cylinder tube. The head cover and the rod cover that are accommodated in the cylinder hole are positioned through abutment of the projections against stepped portions of the recesses.

Abstract: The disclosed sealing structure is used with a piston assembly which exhausts a content. A sealing washer has a sealing hole through which a screw pillar is inserted and is configured to be formed between a piston and a screw cap of the piston assembly. The sealing washer is configured to seal a chink that is generated between threads of the screw pillar at an exhausting of the content when the piston assembly is removed by the screw pillar. The sealing washer has an elasticity such that any space between the sealing hole and the threads of the screw pillar is closed at the exhausting of the content.

Abstract: The present invention consists of a pipe 1 which is open at one end and closed at the other end. There is a collar 2 which is attached to the open end of the pipe 1. The end of the pipe 1 can be closed by using a plug or by other means of manufacture. Within the pipe 1 there is a self-retracting piston consisting of a piston head 3 that rests on a coil compression spring 4 which subsequently rests on the closed end of the pipe 1. There is a perforation 5 at the closed end of the pipe 1.

Abstract: An apparatus and method for coupling a piston member to a rod member to create a piston and rod assembly are provided. The piston and rod assembly may include a piston member having a longitudinal bore and first and second retaining passages in communication with and extending away from the bore. The piston and rod assembly may further include a rod member having a third retaining passage arranged therein, a portion of the rod member being received within the bore of the piston member so that the third retaining passage is arranged within the bore in an offset configuration relative at least one of the first and second retaining passages. The piston and rod assembly may further include a retaining member arranged within the first and second retaining passages of the piston member and the third retaining passage of the rod member.