227results 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.

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 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.

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.

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 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.

A system for engaging clutch plate packs using hydraulic pistons has been developed. The system may be used with an automatic transmission or other parts of a powertrain of a vehicle. The system includes a piston, a clutch plate pack, and a housing containing the piston and the clutch plate pack. To engage and disengage the piston from the clutch plate set, the system is configured to fill and empty a hydraulic chamber on a hydraulic side of the piston such that hydraulic fluid moves the piston toward and away from the clutch plate set. The piston includes one or more shims or spacer posts forming a flow gap. The piston is also configured to position a seal on the piston closer to the hydraulic side.

The utility model provides a collapsible oil cylinder which comprises a cylinder sleeve, an upper end cover, a lower end cover, a first piston, a piston rod and a fixing assembly, and the upper end cover and the lower end cover are respectively connected with the cylinder sleeve. The first piston is slidably connected with the cylinder sleeve, a groove is formed in the first piston, the piston rod is connected with the first piston through a fixing assembly, and the fixing assembly is located in the groove; the fixing assembly comprises an inner nut, a pressing piece and a plurality of pressing bolts, and the inner nut is in threaded connection with one end of the piston rod; the inner nut is sleeved with the pressing piece, and the pressing piece abuts against the outer wall of the inner nut. A plurality of compression bolts penetrate through the compression piece and are connected with the first piston; the piston rod penetrates through the upper end cover. According to the collapsible oil cylinder, the pressing piece is connected with the first piston through the multiple pressing bolts, the pressing piece can wedge the inner nut tightly, the first piston and the piston rod are connected stably, and the running reliability of the collapsible oil cylinder is guaranteed.

The present invention provides a connection mechanism and a shaft / sleeve assembly. The connection mechanism includes a through hole formed in a first member, a groove formed in a second member, a clamping member, and a support member. The clamping member is installed in the through hole, and the support member is installed inside the first member, so that the clamping member can protrude into the groove of the second member under the support of the support member, thereby fixing the second member relative to the first member by clamping of the clamping member with the through hole and the groove. In this way, the connection mechanism described above not only enables two cylindrical members to be assembled and connected together in a relatively fixed manner, but also avoids the problem of undesirable damage to the outer peripheral surface of a member (e.g., a shaft) due to interference fit in the background art.

A vacuum insulating panel may include: a first substrate; a second substrate; a plurality of spacers provided in a gap between at least the first and second substrates, wherein the gap is at a pressure less than atmospheric pressure; a seal provided between at least the first and second substrates, the seal including a first seal layer and a second seal layer, wherein, for at least one location of the seal, the first seal layer has a first width and the second seal layer has a second width, wherein the first width of the first seal layer may be from about 2-20 mm, more preferably from about 3-10 mm, and possibly from about 4-8 mm.

The utility model belongs to the technical field of general hydraulic pressure, and particularly relates to an oil cylinder and a piston mechanism for the oil cylinder. The piston rod is sleeved with at least one clamping ring; the piston is arranged on the piston rod in a sleeving mode and located in the cylinder barrel; the gland is arranged on the piston rod in a sleeving manner and is connected with the piston through a connecting piece, so that the piston is fastened on the clamping ring; according to the oil cylinder and the piston mechanism for the oil cylinder, the gland and the piston are arranged on the two sides of the clamping ring, and the gland and the piston are connected through the connecting piece, so that the piston is fastened on the clamping ring, and matched connection of the piston and the piston rod is achieved without forming threads on the piston rod.

An optimized metallic thermal spray coating able to achieve a suitable surface finish such that it slides against a hydraulic seal without damaging the surface of the hydraulic seal or causing hydraulic fluid to leak between the two sliding surfaces. The optimized metallic thermal spray coating can achieve a surface finish which has a combination of roughness characteristics consisting of an arithmetical mean roughness, a maximum profile peak height, a mean roughness depth designated, skewness, and a roughness relative material ratio, each of which is within well-defined upper limits and / or ranges.

A dosing piston for a dosing pump has a generally cylindrical piston body extending along an axis. A flexible seal body is fitted to but separate from the piston body, forms part of an outer surface of the piston body, and forms with the piston body an annular compartment. A seal ring is formed on and projects radially outward from the seal body, and an elastic biasing element in the annular compartment bears radially inward on the piston body and radially outward on the seal body at the seal ring.

The utility model provides a compressor piston which comprises a piston body. An annular clamping groove is formed in the outer wall of the upper portion of the piston body and used for installing a piston ring. Two protruding block parts which are in bilateral symmetry are integrally formed on the inner wall of the piston body, a pin hole which penetrates through the piston body and the two protruding block parts in the radial direction is formed in the piston body, and a pin shaft used for being connected with a compressor connecting rod is inserted into the pin hole. A counterbore communicated with the pin hole is formed in the bottom of each convex block part, a bolt is in threaded connection with the interior of each counterbore, and the upper end of each bolt abuts against the outer wall of the pin shaft so that the pin shaft can be locked in the pin hole; according to the utility model, the pin shaft can be effectively prevented from rotating relative to the piston body, namely, the phenomenon of abrasion between the pin shaft and the piston body can be avoided, so that the pin shaft can be prevented from axially displacing relative to the piston body, and the normal driving of the piston by the connecting rod can be ensured.

The utility model relates to the technical field of pistons, and discloses a multi-channel piston with an oil control ring, which comprises a connecting mechanism, a chock plug mechanism and a driving mechanism, the connecting mechanism is positioned at the lower end of the chock plug mechanism, and the driving mechanism is positioned at the lower end of the connecting mechanism. The connecting mechanism comprises a connecting skirt, the upper end of the connecting skirt is fixedly connected with a connecting block, the inner wall of the connecting skirt is rotatably connected with a driven gear, and the upper end of the driven gear is fixedly connected with a threaded disc. Through the design that the driving gear drives the driven gear to rotate so as to drive the sliding frame at the upper end to stretch out and draw back, the purpose of conveniently fixing the position of the soybean milk piston head is achieved, so that the piston head can be conveniently disassembled and assembled when the piston head is damaged and needs to be replaced subsequently; and the situation that the complete piston needs to be replaced when the piston head is damaged is prevented, so that the overall maintenance cost of the piston in the later period is reduced, and the overall practicability of the piston is improved.

The invention relates to a connecting rod, in particular for an engine, comprising a head region, a central region (305), and a foot region. The head region has a first connection with a thickened section for connecting a piston to a connecting rod receiving area of the piston in a rotatable manner about a pivot axis, said connecting rod receiving area having an undercut which corresponds to the thickened section. The foot region has a second connection for receiving a crankshaft, and the head region is connected to the foot region via the central region. The invention additionally relates to a piston, a crank drive, and an internal combustion engine.

The utility model discloses an air spring piston which comprises a piston body (1) and a piston sleeve (2), the outer wall of the piston body (1) is provided with a first annular protruding strip (6), the inner wall of the piston sleeve (2) is provided with a plurality of first protruding strips (7) arranged in the height direction, and the adjacent first protruding strips (7) are arranged at intervals. The piston sleeve (2) is arranged outside the outer wall of the middle of the piston body (1) in a sleeved mode, one end of the piston sleeve (2) abuts against the first annular protruding strips (6), the other end of the piston sleeve (2) and the outer wall of the piston body (1) are provided with axial positioning structures, and the axial positioning structures are installed on one or more first protruding strips (7). According to the air spring piston, the axial limiting structure is additionally arranged, the connecting structure between the piston sleeve and the piston body is not affected, and the axial limiting structure is simple, good in reliability and convenient to machine.

The utility model relates to the technical field of hydraulic locks, and discloses an aero seat hydraulic lock which comprises a hydraulic lock body, a first hydraulic lock head and a second hydraulic lock head, one end face of the hydraulic lock body is fixedly provided with the first hydraulic lock head, and the top of the first hydraulic lock head is provided with a communication structure. The other end of the connecting mechanism is fixedly connected with a second hydraulic lock head, a piston rod is slidably connected into the hydraulic lock body, a connecting structure is arranged at one end of the piston rod, a piston structure is arranged at the other end of the piston rod, and a first sealing ring is fixedly installed on the connecting end face of the second hydraulic lock head and the piston rod. Locking is achieved through the incompressibility of hydraulic oil, stable and large locking force can be provided, the aero seat can be reliably fixed to the set position in the flying process of an aircraft no matter the conditions of airflow bumping, acceleration, deceleration, fuselage vibration and the like occur, and the seat is effectively prevented from moving accidentally.

The utility model relates to the technical field of piston rod structures, in particular to a piston rod convenient to assemble. Comprising a piston rod body, the piston rod body is composed of a rod body, a sealing ring, a piston and a bolt, a mounting groove and a threaded groove are formed in the end of the rod body, the fixed shell is arranged on the outer side of the rod body, the rotating shell is rotationally connected to the fixed shell, and the two semicircular plates are connected to the side face of the fixed shell and the side face of the rotating shell respectively. Through cooperation of the fixed shell, the rotating shell, the semicircular plate and the conical block, the sealing ring can be easily opened and guided to be smoothly arranged on the mounting groove in a sleeving mode, the risk that the sealing ring is clamped or damaged in the mounting process can be avoided, the sealing ring does not need to be manually arranged at the end of the rod body in a sleeving mode, and the mounting efficiency is improved. And then the sealing ring is expanded by a tool and gradually pushed to a preset position, so that the mounting efficiency and reliability of the sealing ring can be improved, and the assembly process of the piston rod is simplified.