522results 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.

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.

An internal floating piston (IFP) (25) comprising: A sealing channel (2) formed axially around an outer diameter (OD) of the IFP, wherein the sealing channel comprises: At least two walls (3, 4), wherein the at least two walls of the sealing channel have a smaller OD than an inner diameter (ID) of a chamber; and a tilting protection feature (8) rigidly connected to at least one section of a wall of the sealing channel (2), wherein the tilting protection feature (8) increases the length of the IFP (25).

An internal floating piston (IFP) having circumferential seal groove 2 on its external surface between two walls 3, 4 of the external surface, and an anti-tipping feature 8 increasing a length of said

A ball support arrangement for a piston shoe arrangement (1), wherein the piston shoe arrangement (1) is configured to be provided in an axial piston machine, wherein the piston shoe arrangement (1) includes a piston body (2) having a ball shaped end (3) and a piston shoe (4), wherein the ball shaped end (3) is provided in the piston shoe (4), wherein the ball support arrangement is arranged between the piston shoe (4) and the balls shaped end (3). The objective of the present invention is to provide a ball support arrangement, which is easy to replace and low on maintenance. This objective is solved by a ball support arrangement, which is separate and replaceable, wherein at least a ball portion (5) of the ball support arrangement is configured to accommodate at least part of the ball shaped end (3).

The invention provides a hydraulic control pilot two-stage flow distribution static balance radial plunger hydraulic device and a working method, and relates to the technical field of radial plunger hydraulic devices. According to the scheme, the radial plunger hydraulic device is balanced through hydraulic control pilot two-stage flow distribution static force, flow distribution is controlled through external control pilot pressure, bidirectional rotation of a hydraulic pump motor and self-compensation after a valve plate is abraded are achieved by arranging an external control pilot oil way, and the service life is prolonged. In addition, by arranging the regular polygon driving type structure, regular polygon parts are additionally arranged between the crankshaft and the plunger, the transmission performance of the radial plunger pump is optimized, and friction force is reduced. By arranging the guide sleeve, the rubber cavity assembly and the return spring, the movement centering performance of the plunger can be effectively improved, leakage at the position of the plunger unit is reduced, and the complexity of the motor return device is simplified.

According to one aspect of the disclosure, a brake piston is provided which is provided in a braking system of a vehicle and presses a brake pad against a disc by means of hydraulic brake pressure, wherein the brake piston comprises: a body section which is installed in a cylinder provided in a brake caliper housing, has the form of a column and is arranged to be able to move forwards and backwards, wherein the body section comprises: a first body section which is provided on an outside of the body section in a radial direction of the disc; and a second body section which is provided on an inside of the body section in the radial direction of the disc and has a coefficient of elasticity which differs from a coefficient of elasticity of the first body section.

The utility model discloses a high-strength floating piston which comprises a piston body, a cavity is formed in the piston body, a connecting part is arranged in the cavity, a connecting hole with threads is formed in the connecting part, a limiting and reinforcing assembly is arranged in the cavity, one end of the limiting and reinforcing assembly abuts against the inner wall of the cavity, and the other end of the limiting and reinforcing assembly abuts against the inner wall of the cavity. And the other end of the limiting and reinforcing assembly is clamped on the outer side wall of the connecting part. The connecting part is arranged in the cavity of the piston, the connecting hole with the threads is formed in the connecting part and used for being connected with the piston rod, the limiting and reinforcing assembly is arranged in the cavity, one end of the limiting and reinforcing assembly abuts against the inner wall of the cavity, the other end of the limiting and reinforcing assembly is clamped on the outer side wall of the connecting part, and therefore the contact area of the connecting part and the cavity is increased; therefore, the stability of connection between the connecting part and the cavity is improved, and the structural strength of the connecting part is improved at the same time.

The utility model provides a piston pin convenient to install, and belongs to the technical field of piston pins. The groove is formed in the circumferential surface of the piston pin; the limiting rod is fixedly connected to the circumferential surface of the piston pin; the elastic sleeve is arranged on the circumferential surface of the piston pin in a sleeving mode, and the elastic sleeve is located in the groove; the circular holes are formed in the circumferential surface of the elastic sleeve, the stability of the piston pin in the moving process can be guaranteed through the existence of the elastic sleeve, possible deviation or shaking is reduced, meanwhile, the hollow grooves with the depth being 1 cm are formed in the circumferential surface of the piston pin, and due to the design, the weight of the piston pin is reduced, abrasion is reduced, and the service life is prolonged. And the elastic sleeve is flush with the piston pin, so that the appearance of the piston pin is smoother, the friction between the piston pin and other parts is reduced, and the maintenance cost is further reduced.

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.

The invention provides a hollow piston rod hydraulic cylinder with an equal reciprocating speed and a middle through oil way structure, and belongs to the field of design and manufacturing of piston rod type hydraulic cylinders and design of hydraulic systems, the hollow piston rod hydraulic cylinder comprises a hydraulic cylinder shell, a hollow piston rod and a moving carrier, and the hollow piston rod is arranged in the hydraulic cylinder shell; a single-action hydraulic cylinder is installed on the moving carrier and connected with a cavity of the hollow piston rod through a connecting oil way of the moving carrier. Due to the arrangement of the middle oil pipe, the acting areas of the two ends of the piston of the hydraulic cylinder are approximately equal, and the device can control the moving carrier to reciprocate at the same speed by controlling the stretching of the hollow piston rod hydraulic cylinder; through the middle oil pipe at the cylinder bottom and the cavity structure of the hollow piston rod, the function of oil passing inside the piston rod is achieved, arrangement of an external oil pipe oil way is avoided, and the hydraulic pipeline design problem of a moving carrier provided with a hydraulic system or a hydraulic executing mechanism under the moving working condition is solved.

One or more techniques and / or systems are disclosed for a mechanical assembly comprising a connecting rod with a first end and a second end, a crankshaft journal, a wrist pin, and at least one guide spacer. The crankshaft journal may be coupled to the first end of the connecting rod, allowing for the transmission of rotational forces. The wrist pin may be configured to attach to the second end of the connecting rod, facilitating the transfer of mechanical motion. At least one guide spacer may be positioned on the wrist pin, located on either side of the connecting rod at the second end, to provide alignment and reduce wear. The crankshaft journal and the wrist pin may be arranged in parallel, enabling the connecting rod to perform both rotational and reciprocating motions.

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.

[Object] To reduce the amount of wear of a lip ring containing PTFE as a main component.[Solving Means] A sliding mechanism for a locking piston type oil-free reciprocating compressor includes: a cylinder; and a lip ring. The cylinder includes a metal cylinder body having a cylindrical inner peripheral surface extending in an axial direction and a coating film provided on the inner peripheral surface. The lip ring is attached to a piston reciprocating along the axial direction while swinging in the cylinder and slides with respect to the coating film during the reciprocation of the piston. The lip ring contains PTFE as a main component. The coating film contains PTFE and a binder resin as main components, and a mass ratio of the PTFE to the binder resin is 0.4 or more and 2.0 or less.

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 present invention discloses an integrated jack and a push-up device, the jack includes an outer frame body and a jack body, the jack body includes a cylinder body, a piston rod and a piston, the outer frame body includes a rectangular parallelepiped frame, the rectangular parallelepiped frame is sleeved outside the cylinder body, and the cylinder body is fixedly connected to the rectangular parallelepiped frame through a connecting component; the outer frame body also includes a plurality of positioning docking components, the positioning docking components include a vertically arranged slot and a vertical plug rod adapted to the slot, the slot and the vertical plug rod are arranged in a one-to-one correspondence, the slot is fixedly installed on one of the horizontally arranged surfaces of the rectangular parallelepiped frame, the vertical plug rod is fixedly installed on another horizontally arranged surface of the rectangular parallelepiped frame, and the central axis of the vertical plug rod and the slot is located on the same vertical straight line. The jack adopts this structure to conveniently realize the precise positioning and combined assembly of multiple jacks to form a push-up device, so as to increase the thrust of the push-up device by superimposing the jacks, thereby improving the assembly efficiency of the device.

The utility model belongs to the technical field of crank connecting rod mechanisms, and discloses a gasoline engine crank connecting rod mechanism which comprises a piston, a connecting rod, a crankshaft and a positioning structure, the crankshaft comprises rotating plates and a connecting rod, the rotating plates are connected through the connecting rod, and the connecting rod is movably connected with the piston through the connecting rod. A positioning structure is arranged at the connecting position of the connecting rod and the connecting rod and the connecting position of the connecting rod and the piston, the positioning structure is used for controlling the sliding distance of the connecting rod on the connecting rod, and the positioning structure comprises an auxiliary groove, a limiting groove and an auxiliary plate. According to the crank connecting rod mechanism, the connecting rod is embedded into the connecting rod between the two rotating plates from top to bottom, so that the auxiliary plates are embedded into the limiting grooves through the auxiliary grooves, friction between the connecting rod and the rotating plates is replaced by the balls, and then the problem that when an existing crank connecting rod mechanism operates, the surfaces of the two sides of the connecting rod and plates are repeatedly rubbed is solved.