816results about "Trunk pistons" patented technology

Rods, pipes and internal cavities that include a coated surface are described. The rod or pipe can include an alloy layer on an external surface, an internal surface or both. The alloy layer can include molybdenum or tungsten and at least one element or at least one compound comprising one or more of nickel, cobalt, chromium, tin, phosphorous, iron, magnesium or boron.

A gas turbine engine is provided and includes a first rotor element defining a groove, a second rotor element disposed to rotate about the first rotor element and a piston seal ring (PSR) disposed in the groove to form a seal between the first rotor element and the second rotor element. The second rotor element is formed to define bypass flow channels about the PSR that extend between opposite axial sides of the PSR.

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.

The invention relates to mechanical testing equipment, in particular to a sealing performance adjustable compression shear testing machine which comprises a driving oil cylinder, the driving oil cylinder comprises a shell assembly, and the shell assembly comprises a cylinder barrel and a first end cover and a second end cover which are connected with the two ends of the cylinder barrel respectively; the piston assembly comprises a rotary sliding piston and a sealing ring, and the sealing ring is arranged on the periphery of the rotary sliding piston in a sleeving mode to seal the rotary sliding piston and the cylinder barrel; the piston rod is fixedly connected with the piston assembly; when the piston assembly slides from the first end cover to the second end cover from the static state, the rotary sliding piston rotates horizontally and slides vertically, and the piston rod slides vertically under sliding of the piston assembly. According to the driving oil cylinder, at the moment when the piston is started, the piston firstly rotates, so that the piston and the cylinder barrel are in a dynamic friction state, then the piston vertically slides, the piston does not move when being started, and sealing failure caused by twisting of the sealing ring is avoided.

The invention relates to the field of shear tests, in particular to a shear test driving oil cylinder which comprises a splitting mechanism used for providing a test environment, a fixing seat and an external mechanism, the external mechanism is provided with the fixing seat used for installing a test block, and the upper side of the fixing seat is provided with a splitting mechanism used for splitting the test block. An oil cylinder mechanism used for providing power is installed at the upper end of the splitting mechanism, the adjusting mechanism is used for adjusting the internal sealing environment of the oil cylinder mechanism and providing stress release for the oil cylinder mechanism, the oil cylinder mechanism comprises an oil cylinder body, and a sealing plug is arranged at an opening in the bottom of the oil cylinder body; the piston rod penetrates through the sealing plug and is connected with a pressure applying piston assembly located in the center inside the oil cylinder body. The device is used for solving the technical problem that a sealing ring of a piston part is damaged due to instant impact force caused by a water hammer effect of oil liquid due to instant pressure loss of the piston part in a pressure applying oil cylinder at the top after bottom concrete is instantly cracked in a high-pressure environment shear test process.

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.

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, anda 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 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.

The utility model discloses a radial plunger motor with a braking function, which comprises an output flange shaft, a fixed shell rotationally connected with the output flange shaft, and a braking cylinder connected with the output flange shaft, the friction plate set is located between the fixed shell and the brake cylinder body, static friction plates in the friction plate set are connected with the fixed shell, and dynamic friction plates in the friction plate set are connected with the brake cylinder body; and the double-piston assembly is arranged in the fixed shell and located on one side of the friction plate set, and the double-piston assembly can be used for braking the brake cylinder body. Through the structural improvement, on one hand, the overall compactness of the motor can be improved, and the axial size is reduced, so that the motor can be suitable for a scene with a smaller installation space; on the other hand, the double-piston structure is adopted, the acting area can be increased, the acting force can be increased, and therefore the larger braking torque can be obtained under the condition of the same radial size; and the opening pressure of brake release can also be reduced.

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.

A piston unit adapted to reciprocate in a cylinder includes a piston and a top land member attached to the piston. The piston includes a first portion including a piston end at one end surface side and fitted with the top land member. The first portion has a smaller outer diameter than a second portion such that there is a step therebetween. The second portion is the other portion of the piston than the first portion. The top land member has a groove wall forming surface opposed to a step surface that connects the outer circumferential surface of the first portion and the outer circumferential surface of the second portion. The first ring groove is defined by the groove wall forming surface, the step surface, and the outer circumferential surface of the first portion.

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.

The invention discloses a two-stroke heavy oil aviation piston engine, and belongs to the technical field of unmanned aerial vehicle engines, the two-stroke heavy oil aviation piston engine comprises an engine body, a spark plug, an exhaust pipe, a fuel oil supply system, a crank connecting rod mechanism, two pistons and an auxiliary heating system, the engine body is composed of a crankcase and two piston cylinders, and the two piston cylinders are horizontally and oppositely distributed on the two sides of the crankcase; the two sides of the crankcase are connected with the short output shaft and the long output shaft in a penetrating and coupling mode, and a rotating cavity opposite to the crankshaft connecting disc is formed in the crankcase. The opposed crankshaft connecting disc is provided with two crank throws in an opposed 180-degree working phase, and the structure of the opposed crankshaft connecting disc without a central shaft neck can reduce the centrifugal force of rotation and improve the operation stability; the crank throw is connected with the piston through a connecting rod, and the joint can rotate; the two pistons are respectively positioned in the two piston cylinders; and the auxiliary heating system is dispersedly arranged on the engine body, consists of a temperature switch and a heating rod, and is used for heating the purified oil-gas mixture provided by the fuel oil supply system.

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.