371results about "Trunk pistons" patented technology

An IFP is disclosed. The IFP includes a sealing channel formed axially about an outer diameter (OD), the sealing channel including at least two walls where the at least two walls of the sealing channel having a smaller OD than an inner diameter (ID) of a chamber and a channel is formed between the at least two walls. The IFP also includes an anti-tipping feature fixedly coupled with at least a portion of one wall of the sealing channel, the anti-tipping feature increasing a length of the IFP.

Provided in the present utility model are a piston control assembly, a piston structure and an anti-suffocation device. The piston control assembly comprises a piston rod, a limiting member and a control structure. The piston rod is internally provided with an accommodating cavity; the limiting member is hinged to the lower middle part of the piston rod, and at least partially protrudes outwards from the outer wall of the piston rod, so as to limit a piston head to the bottom of the piston rod; and the control structure comprises a push rod slidably mounted in the accommodating cavity and a control member slidably fitting with the push rod, wherein when moving downwards, the push rod can push against the limiting member to cause the limiting member to rotate until the outer wall of the limiting member is flush with or recessed into the outer wall of the piston rod, thereby releasing the limiting on the piston head. The push rod is controlled by the control member to move, and the movement of the push rod then causes the limiting member to deflect until the limiting thereof on the piston head is released, such that an independent movement and interlinked cooperation structure is provided for the piston head, and the separated movement or synchronous movement of the piston rod and the piston head can be realized; thus, a negative pressure condition can be formed by means of the independent movement of the piston head, thereby providing a relatively good negative-pressure suction effect.

A dry type piston structure for an aviation airplane wheel brake comprises a pull rod, a lining and a piston, the pull rod comprises an end plate and a rod shaft, the piston is arranged in an inner cavity of the lining in a sliding mode, the end plate of the pull rod and the end face of the lining are installed in a matched mode, a through hole communicated with the inner cavity of the lining is formed in the end plate of the pull rod, and a support is arranged in an inner cavity of the piston. The support is sleeved with a return spring, an expansion pipe is arranged in an inner hole of the support, a horn mouth is formed in the end, away from an end plate of the pull rod, of the expansion pipe, the outer surface of the horn mouth extends out of the inner hole and abuts against the support, and a rod shaft in the middle of the pull rod penetrates through the expansion pipe and extends out of the horn mouth of the expansion pipe. The rod shaft of the pull rod is sleeved with a ball head at the horn mouth of the expansion pipe and provided with a nut through threads, a heat insulation block is arranged at an opening of an inner cavity of the piston, and a first sealing ring and a first protection ring are arranged between the rod shaft of the pull rod and the piston. Brake hydraulic oil is isolated outside the piston, reliability is high, output force is stable, and maintenance is convenient.

A sealing ring includes a first sealing element having a first mating surface and a second sealing element having a second mating surface. A high-pressure boundary extends across at least a portion of the first sealing element and across at least a portion of the second sealing element, and a low-pressure boundary extends across at least a portion of the first sealing element and across at least a portion of the second sealing element. The first mating surface, the second mating surface, or both, includes a recess open to the low-pressure boundary and not open to the high-pressure boundary. The recess may include a groove, for example. The first mating surface is sealed against the second mating surface by a first force acting on the first sealing element and a second force acting on the second sealing element. These forces act to pressure-lock the assembly.

An IFP is disclosed. The IFP includes a sealing channel formed axially about an outer diameter (OD), the sealing channel including at least two walls where the at least two walls of the sealing channel having a smaller OD than an inner diameter (ID) of a chamber and a channel is formed between the at least two walls. The IFP also includes an anti-tipping feature fixedly coupled with at least a portion of one wall of the sealing channel, the anti-tipping feature increasing a length of the IFP.

Pneumatic articles that include a moveable component with a coated surface are described. The coated surface can include a surface coating including an alloy layer that includes molybdenum or tungsten in combination with one or more other materials. Pneumatic cylinders and pneumatic devices are also described.

The invention relates to improvements in the technical field of disk brakes. For this purpose, inter alia, a piston (1) for a disk brake is proposed, said piston comprising an outer part (4) and an inner part (5) inserted into the outer part (4), wherein a cavity (8) is formed between the outer part (4) and the inner part (5), which cavity is closed in a fluid-tight manner by at least one fluid-tight connection (9, 10) between the inner part (5) and the outer part (4) to prevent the ingress of hydraulic fluid.

A syringe system, piston seal systems, stopper systems, and methods for assembling and using the syringe systems. The piston seal system including a piston seal member and a piston head member. The injection system including a container, a piston seal system positioned within the container, and a stopper system coupled to an end of the container. The method of assembling an injection system, the method includes obtaining a container, a piston seal system, and a stopper system. The method also includes inserting the piston seal system into a cavity within the container. The method further includes securing the stopper system at an end of the container in an opening of the cavity. Methods of using the syringe system, piston seal systems, and stopper systems are also disclosed.

The present invention relates to a valve arrangement. The present invention further relates to a fluid flow control element. Furthermore, the present invention relates to a turbomachine system comprising such a valve arrangement and / or fluid flow control element. Moreover, the present invention relates to a method and a use relating to the valve arrangement and / or the fluid flow control element.

To provide a piston for an internal combustion engine and a manufacturing method thereof, capable of improving seizure resistance of a skirt face and simultaneously reducing friction.SOLUTION: A thrust side skirt portion 18A extending toward a bottom of a cylinder bore on an outer peripheral portion of a piston 10 and an anti-thrust side skirt portion 18B of a position opposed thereto are composed of an aluminum alloy as a base material 40. In forming silicon dispersion layers 43 by applying a pulse laser beam to outer surfaces of two skirt portions, a silicon average particle size of a first silicon dispersion layer 43A formed on the thrust side skirt portion 18A is determined to be smaller than a silicon average particle size of a second silicon dispersion layer 43B formed on the anti-thrust side skirt portion 18B.SELECTED DRAWING: Figure 5

To improve thermal efficiency by activating combustion.SOLUTION: A combustion chamber structure 100, having a cavity 10 circular in a planar view, recessed downward with respect to a piston top surface 9a, and provided for a direct injection diesel engine 1 where fuel is radially injected from a nozzle 8 at the center of a cylinder ceiling part 11 into the cavity 10 to cause self-ignition, includes a first rising part 102 rising upward from the radial outer end of a bottom face 101 so as to encircle the bottom face 101 of the cavity 10, and a protrusion part 30 provided between the nozzle 8 and the first rising part 102 in the radial direction of the bottom face 101 while extending upward from the bottom face 101 so as to hit fuel spray Fu injected from the nozzle 8 and vertically divide the fuel spray Fu.SELECTED DRAWING: Figure 2

The plunger assembly comprises a plunger, a spring pin and the needle roller bearing, the needle roller bearing comprises an outer ring and a needle roller, a shaft core is arranged in the center of the needle roller bearing, the needle roller is arranged between the shaft core and the outer ring, fixing grooves are formed in the two sides of the plunger, and the spring pin is arranged in the fixing grooves. The two sides of the shaft core are inserted into the fixing grooves, a spring pin is further arranged at one end of the shaft core, a needle bearing cavity for the needle bearing to be installed is formed in the plunger, when the needle bearing rotates at a high speed, a liquid dynamic pressure oil film is formed between the needle bearing and the needle bearing cavity, and the liquid dynamic pressure oil film provides supporting force for the needle bearing. The shaft core and the liquid dynamic pressure oil film jointly support the downward pressure of the needle bearing, and the needle bearing is characterized in that the liquid dynamic pressure oil film can provide supporting force, the liquid dynamic pressure oil film and the shaft core jointly bear the downward pressure of the needle bearing, frictional resistance is reduced, mechanical efficiency is improved, part abrasion is reduced, and meanwhile the supporting stability of the needle bearing is enhanced.

The utility model discloses a piston and piston rod connecting structure capable of preventing a piston rod from being broken, which comprises an outer cylinder, the piston rod and a piston block, and is characterized in that a support plate is fixed inside the outer end of the outer cylinder, the outer cylinder is fixed at two ends of the support plate through a connecting rod, and a vertical plate is fixedly connected to the upper side of the support plate. The vertical plate is connected with a piston rod limiting assembly; the piston rod limiting assembly comprises a sliding groove, the sliding groove is formed in the middle of one side of the supporting plate, one end of a T-shaped sliding block is arranged in the sliding groove, and racks are fixedly arranged at the two ends of a transverse rod of the T-shaped sliding block respectively. The utility model relates to the technical field of pistons, in particular to a piston and piston rod connecting structure capable of preventing a piston rod from being broken, which achieves symmetrical supporting and limiting of the piston rod through the arrangement of a supporting plate, a connecting rod, a vertical plate and a piston rod limiting assembly, effectively disperses stress borne by the piston rod and improves the service life of the piston rod. And the stability and the fracture resistance are improved.

The invention relates to a piston ring. A piston ring (100) for a piston of a reciprocating internal combustion engine comprises a ring section (1) and a lock section (2). The lock segment (2) comprises a circumferential parting line (7) at a first axial parting line distance (PaT) from the top surface (T) of the piston ring (100) and at a second axial parting line distance (PaB) from the bottom surface (B) of the piston ring (100). Furthermore, the piston ring (100) comprises an arcuate profile (10) having a circumferential pivot line (8) at a first axial pivot line distance (PiT) from the top surface (T) and at a second axial pivot line distance (PiB) from the bottom surface. The axial distance (9) between the circumferential parting line and the pivot line is less than 20% of the axial width of the piston ring. The arcuate profile (10) may include a most protruding, axially extending flat section (14). The flat section (14) comprises a circumferential parting line (7).

The utility model belongs to the technical field of grease guns, and particularly relates to a grease pumping device of a grease gun, which comprises a mounting sleeve capable of being arranged in a grease gun barrel, a piston piece slidably arranged in the mounting sleeve and a fixing component used for fixing the mounting sleeve in the grease gun barrel. The piston piece comprises a piston rod arranged in the mounting sleeve and a piston arranged on the piston rod, the piston can be attached to the inner wall of the grease gun barrel, a threaded rod is rotationally arranged in the mounting sleeve, a threaded hole matched with the threaded rod is formed in the piston rod, the threaded rod penetrates through the threaded hole, and a driving end is arranged at the rear end of the threaded rod; the driving end is controlled to rotate to drive the piston rod and the piston to move back and forth along the threaded rod through the threaded rod, the grease pumping device is simple in structure, grease is pumped into the grease gun barrel through a screw transmission structure, and therefore the efficient and labor-saving effects are achieved. And some users with small arm strength can finish the grease pumping work of the grease gun barrel at one time, so that the working efficiency is improved.

A displacer for an engine includes a body extending along a displacer longitudinal axis from a displacer first end surface to a displacer second end surface. At least one channel extends between a first opening in the displacer first end surface and a second opening in the displacer second end surface and has sidewalls therebetween defining a channel flow path. The first opening is located at a first radial distance from the displacer longitudinal axis in a first radial direction and the second opening is located at a second radial distance from the displacer longitudinal axis in a second radial direction. At least a portion of the channel flow path has a component in an angular direction that is at an angle to both the first and second radial directions.

To provide a piston ring for providing sufficient sealing and long life durability of the piston ring and a cylinder liner.SOLUTION: A piston ring 100 for a piston of a reciprocating internal combustion engine includes a ring part 1 and a locking part 2. The lock 2 comprises a circumferential parting line at a first axial parting line distance from the top side T of the piston ring 100 and at a second axial parting line distance from the bottom side B of the piston ring 100. Further, the piston ring 100 comprises a cambered contour, wherein the cambered contour comprises a circumferential pivot line having a first axial pivot line distance from a top surface T of the piston ring 100 and having a second axial pivot line distance from a bottom surface. According to the invention, the axial distance between the circumferential separation line and the pivot line is less than 20%, preferably less than 10%, of the axial width of the piston ring.SELECTED DRAWING: Figure 1

The invention relates to a piston (16) for an internal combustion engine (10), in particular a V-engine. The piston comprises an oil drain groove (54) which is provided in an outer circumferential surface of the piston (16) between a ring belt (26) and a piston skirt (24) of the piston (16), the piston skirt (24) being provided with two recessed pin boss portions (42) on opposite sides of the piston (16), wherein the piston skirt (24) is further provided with at least one oil drain duct (56) which is arranged between the two recessed pin boss portions (42) at an outer surface of the piston skirt (24) and which is configured for fluidically connecting the oil drain groove (54) with the recessed pin boss portions (42).

This invention discloses a hydraulic piston for an air booster pump, relating to the technical field of hydraulic pistons for air booster pumps. It includes a push rod, one end of which has a positioning insert that can pass through a brake piston, and the other end is a connecting end that connects to an air chamber piston. A sealing gasket is provided between the brake piston and the push rod for sealing connection. The diameter of the free end of the sealing gasket is smaller than the diameter of the contact surface of the push rod. This application eliminates the push rod seat connecting the brake piston and the push rod in conventional air booster pumps, ensuring braking sensitivity and thus increasing safety. This application achieves rapid and sensitive response by directly connecting the brake piston and the push rod, improving braking safety and saving braking reaction time.

The invention relates to a segmented rolling bearing ring (1) for a large rolling bearing (2) with an inner side (5) facing at least one raceway system (3) for rolling elements (4), on which at least one rolling bearing raceway (6) is provided, wherein the rolling bearing ring (1) is divided into ring segments which adjoin each other in the circumferential direction forming butt joints at butt faces (11) and which are sealed against each other in the area of ​​the butt joints by means of strip-shaped seals (13), wherein the butt joint between a first (7) and a second of the ring segments is covered on an outer side (15) of the rolling bearing ring (1) facing away from the inner side (5) by one of the strip-shaped seals (13) and the seal (13) is clamped against the butt joint by means of at least one clamping plate (16) screwed to the first (7) and / or the second ring segment.

A finishing device, comprising a thrust system (101), a sealing system (102), a conveying pipe system (103), and a recovery system (104), wherein the sealing system (102) comprises a piston (21) and a cylinder body (18) cooperating with the piston (21); the cylinder body (18) is used for accommodating a finishing medium (8) for performing finishing processing; the conveying pipe system (103) conveys the finishing medium (8) to a port of an inner-flow-channel workpiece (34); the recovery system (104) comprises a recovery container (35), a recovery pipe (36), a return pipe (37), a power assembly (130), and a control valve assembly (140); the control valve assembly (140) comprises a first valve (38) and a second valve (39); the recovery container (35) is in communication with the inner-flow-channel workpiece (34) by means of the recovery pipe (36), and is in communication with the sealing system (102) by means of the return pipe (37); the first valve (38) cooperates with the sealing system (102) and a low-pressure environment; the second valve (39) is located at the return pipe (37) and cooperates with the recovery container (35) and the sealing system (102); and the power assembly (130) is in communication with the recovery container (35). By means of the cooperation of all parts, rapid supplementation of the finishing medium of the sealing system is realized, ensuring the efficiency of finishing processing. Further provided is a finishing method.

The invention discloses a gas-liquid cylinder which comprises a cylinder body, a piston is arranged in the cylinder body, a piston rod with the end extending out of the cylinder body is connected to the piston, a gas chamber and an oil chamber are correspondingly formed in the two sides of the piston in the cylinder body respectively, a gas channel communicated with the gas chamber is formed in the cylinder body, and the oil chamber is communicated with the gas channel. The cylinder body is further provided with an independent oil inlet and an independent oil outlet which are communicated with the oil chamber, and a switch valve is arranged at the oil outlet. When the piston rod extends outwards, the switching valve is closed to close the oil outlet, hydraulic oil is input into the oil chamber from the oil inlet, and gas in the gas chamber is compressed to form pre-pressure; and when the piston rod resets, the switching valve is opened to open the oil outlet, and the hydraulic oil in the oil chamber is discharged from the oil outlet. The reset mechanism has the advantages of being reasonable in structure and high in reset speed.

The utility model discloses a composite novel connection type piston which comprises a composite piston and a connecting rod, rotating seats are rotatably connected to the interiors of two mounting grooves in the composite piston, a connecting shell is fixedly connected to the end of the connecting rod, a limiting assembly is arranged on one side of the connecting shell, and the limiting assembly comprises a shell body. The shell is fixed to one side of the connecting shell, a movable plate is slidably connected to the interior of the shell, a limiting rod is fixedly connected to one side of the movable plate, a spring is fixedly connected to the edge of the other side of the movable plate, a pull rod is fixedly connected to the center of the other side of the movable plate, and the pull rod penetrates through the shell and is slidably connected with the shell. According to the novel composite connection type piston, the spring pushes the movable plate to slide along the inner wall of the shell, the movable plate drives the limiting rod to be inserted into the limiting groove of the bidirectional lead screw to complete limiting operation on the bidirectional lead screw, the bidirectional lead screw is prevented from sliding, and the stability of the device is improved.

The novel motorcycle engine piston with the high combustion efficiency comprises a piston block and a connecting rod, an extending block is fixedly arranged at the lower end of the piston block, a hole groove is formed in the center of the extending block, a fixing ring is fixedly arranged at the top end of the connecting rod, and a pin shaft is movably arranged at the center of the fixing ring in a penetrating and inserting mode. The bottom end of the connecting rod is fixedly provided with a splicing block, and the lower end of the extending block is provided with a fixing mechanism facilitating fixing of the position of the pin shaft. During dismounting, the limiting rod is firstly moved to extrude the first spring, then the movable rod is moved to enable the second spring to be stretched, meanwhile, the limiting block is far away from the bottom end of the clamping block, then the limiting rod is loosened, the first spring drives the limiting rod to be separated from the limiting hole at the moment, then the pin shaft is extruded to be taken out, no extra dismounting tool is needed, and dismounting work is greatly facilitated.

The piston assembly includes a piston head. The piston assembly further includes an upper connecting rod rotatably coupled to the piston head. The piston assembly further includes a shoe disposed between the upper connecting rod and the inner wall of the piston head.

The utility model discloses a novel knockout piston fastening structure of a die casting machine. The novel knockout piston fastening structure comprises a piston, a piston sleeve and a bolt. A first screw hole and a second screw hole are respectively formed in the piston and the piston sleeve; the bolt is suitable for penetrating through the first screw hole to be connected with the second screw hole in a matched mode, so that the piston sleeve tends to move in the direction of the piston. The novel knockout piston has the beneficial effects that compared with an existing knockout piston, the novel knockout piston is provided with the bolt and the screw hole; the connection mode between the bolt and the screw hole is changed by changing the arrangement direction of the bolt and the relative position or arrangement direction of the piston and the screw hole in the piston sleeve; or an elastic piece is arranged between the piston and the piston sleeve; by means of the arrangement, connection between the piston and the piston sleeve is tighter, and therefore the sealing performance and the shockproof performance are improved.

The invention relates to a piston pin comprising a tubular body made of an iron-based sintered alloy; wherein the piston pin is mounted to penetrate an upper end of a connecting rod and a piston; and wherein the center of gravity of the piston pin is eccentric in the circumferential direction.

The disclosure relates a piston (1) for a reciprocating internal combustion piston engine. The piston has a scraper ring groove (2), for receiving an oil scraper ring, the groove (2) extending annularly around a circumference of the piston (1). A receptacle volume (3) is arranged below the scraper ring groove (2), and a receiver conduit (4) extends between the scraper ring groove (2) and the receptacle volume (3), so as to provide fluid communication therebetween. A drainage conduit is provided (5) extending from the receptacle volume (3) towards a bottom (1b) of the piston. Notably, a bottom (3b) of the receptacle volume (3) has an annular inclination towards the drainage conduit (5). During an upstroke of the piston, the inclined bottom of the receptacle volume thrusts lubrication oil residing within the receptacle volume towards the drainage conduit.

The utility model relates to the technical field of hydraulic oil cylinders, in particular to a gas-liquid mixed pressure type energy-saving oil cylinder which comprises a mixing cylinder and a base, the lower end of the mixing cylinder is fixedly connected with the base, an end cover is installed at the end of the mixing cylinder, the inner wall of the end cover is fixedly connected with a sealing sleeve, and the upper end of the sealing sleeve is fixedly connected with a dustproof ring. The inner wall of the sealing sleeve is connected with an auxiliary mechanism. By controlling hydraulic oil injected or discharged outwards from the same oil valves at the upper end and the lower end of the mixing cylinder, the piston rod freely stretches out and draws back in the mixing cylinder when being pushed, the inflation valve injects and discharges different air pressures into and out of the hollow rod, and the hollow rod is sealed by the sealing ring on the inner wall of the piston rod, so that a cavity in the piston rod can push and pull the piston rod; power can be independently provided for different positions of the piston rod in the mixing cylinder through the oil valve and the inflation valve, independent power supply of gas and liquid is achieved, use of different object strengths is improved, and different energy-saving effects are achieved.