WO2012113349A1 - Vérin hydraulique et distributeur de commande hydraulique de type à tiroir à bague d'étanchéité - Google Patents

Vérin hydraulique et distributeur de commande hydraulique de type à tiroir à bague d'étanchéité Download PDF

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Publication number
WO2012113349A1
WO2012113349A1 PCT/CN2012/071603 CN2012071603W WO2012113349A1 WO 2012113349 A1 WO2012113349 A1 WO 2012113349A1 CN 2012071603 W CN2012071603 W CN 2012071603W WO 2012113349 A1 WO2012113349 A1 WO 2012113349A1
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WO
WIPO (PCT)
Prior art keywords
seal
piston
ring
hydraulic
sealing
Prior art date
Application number
PCT/CN2012/071603
Other languages
English (en)
Inventor
Lok Kin LEE
Kyong Tae Chang
Original Assignee
Innozeal Technology Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Innozeal Technology Ltd. filed Critical Innozeal Technology Ltd.
Publication of WO2012113349A1 publication Critical patent/WO2012113349A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/04—Helical rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1447—Pistons; Piston to piston rod assemblies
    • F15B15/1452—Piston sealings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1457—Piston rods
    • F15B15/1461—Piston rod sealings

Definitions

  • the invention relates generally to sealing of moving parts in hydraulic systems, and in particular, to sealing of pistons in hydraulic cylinders, and sealing of spools in spool type hydraulic control valves.
  • the sealing of the piston and the piston-rod is achieved by rubber O-rings. Sealing of the piston and piston-rod by rubber O-ring can be done only when the rubber O-ring has a certain range of elasticity which means the ambient temperature should be within the range between -50 degree C and +250 degree C.
  • the elasticity of rubber O-ring is an essential characteristics to perform sealing. Nevertheless, the elasticity of rubber O-ring is lost below -50 degree C due to freezing of rubber molecules. In addition, the elasticity of rubber O-ring is lost above +250 degree C due to carburizing of rubber molecules.
  • the elasticity of rubber O-ring is essential but it also causes the pressure limitation to apply in hydraulic cylinder.
  • the rubber O-ring is usable only below a certain pressure limit, e.g.: 450 kg/square-cm, because the seal will be destroyed when rubber is squeezed out of the gap between the cylinder and the piston. This is referred as extrusion phenomenon when the rubber O-ring is exposed to the pressure above a certain limit, e.g. : 450 kg/square-cm.
  • rubber O-rings used for piston in conventional art suffer from many disadvantages including typically temperature limitation and pressure limitation.
  • Rubber O-rings cannot withstand high pressure alone and need one or two assisting rings to help withstand high pressure. Wear ring made of hard polymer such as glass fiber reinforced phenol resin are also needed to provide the rubber O-rings longer life. Other hard polymer ring are also needed to overcome friction of rubber O-rings and thereby make sliding action easy. As a result, a total of around 10 assisting O-rings are required according to conventional art.
  • the spool type direction control valve for high pressure hydraulic system in conventional art has no sealing rings on spool.
  • the sealing of spool in conventional art relies only upon the precise dimension control approaching submicron grade and finer finishing of the surface of the bore and surface of the spool to minimize leakage. There are no practical sealing devices in between the bore and the spool.
  • elastomeric material such as polyamide could withstand 500 bar pressure before it is extruded but the elastomeric material cannot be employed on the spool as sealing ring.
  • valve block In constructing spool type valve there must be two parts, the valve block and the spool. There must be at least 5 ports in a valve block of spool type control valve:
  • Drilling a hole that penetrates the metal wall creates unavoidable burs on the opposite side of the metal wall which should be removed using proper tool such as chamfer tool to undergo subsequent processes safely since the burs are always sharp and could damage other contacting parts and can be cause of the sticking of other mating part.
  • both sides of the metal on which holes are drilled are in open condition it is easy to remove drill hole burs and also could easily be chamfered to avoid sharp corner edge of the drilled holes but if one side of the drilled hole remains in closed location as inside of the cylinder bore where the chamfer process is not accessible the sharp corner edge of the drilled hole has to be left not chamfered.
  • the hole inside the cylinder is not true circle but in oval shape as the drilled hole from outside is connected to the cylindrical surface of the cylinder bore that makes even sharper edge if not chamfered.
  • Low pressure application spool valves such as pneumatic control systems applicable pressure under 30 bar are using elastomeric O-rings for spool sealing ring in the pneumatic spool valve since the rubber O-ring has enough strength to overcome sharp edge of drilled hole not chamfered remaining inside of the cylinder bore of the spool valve when the pressure is very low.
  • CFS Ceramic Felt Seal
  • the present invention allows the removal of all of the rubber O-rings in hydraulic cylinder pistons according to conventional art.
  • the present invention results in simplicity in structure, higher performance, the ability of withstanding extreme high temperature, extreme low temperature, and extreme high pressure, and in the meantime provides minimum friction loss and substantially zero leak seal.
  • the hydraulic actuator includes a metal helical coiled multilayer seal for sealing between two relatively moving parts.
  • the hydraulic actuator further includes a hydraulic cylinder assembly.
  • the metal helical coiled multilayer seal is configured for piston sealing and piston rod sealing.
  • the hydraulic actuator further includes a spool type hydraulic control valve.
  • the metal helical coiled multilayer seal is configured for piston sealing.
  • Fig-1 shows the cut out view of over all schematic of hydraulic cylinder assembly according to an embodiment of the present invention.
  • Fig-2 shows the cut out view of overall schematic of hydraulic cylinder assembly in accordance with the conventional art.
  • Fig-3 shows the enlarged detail of the rubber O-rings before and after inserted in the cylinder according to an embodiment of the present invention.
  • Fig-4 shows the cutout view of spool type pneumatic valve that uses rubber O-rings as seal ring for sealing and isolates or connect each port in each given control condition.
  • Left side drawing depicts the condition of piston pushed out and right side drawing depicts the condition of piston pulled in by control of hydraulic fluid.
  • Fig-5 is the enlarged cutout view of valve body spool, rubber O-rings that shows how the rubber O-ring could be torn out by the sharp edge of the drilled hole into valve body when the sharp edge of the drilled holes are not chamfered.
  • Fig-6 shows the cutout view of spool type high pressure hydraulic valve according to an embodiment of the present invention, that uses metallic seal rings for sealing that isolate or connect each port in each given control condition.
  • Left side drawing depicts the condition of piston pushed out and right side drawing depicts the condition of piston pulled in by control of hydraulic fluid.
  • Fig-7 is enlarged cutout view of valve body, spool, metallic O-ring seal that shows how the metallic O-ring seal according to an embodiment of the present invention could withstand extreme high pressure without distorted or being damaged by high pressure in the high pressure hydraulic system.
  • Fig-8 shows a Coiled Felt Seal that is adopted on a hydraulic cylinder piston or on a spool of a spool type hydraulic control valve in accordance with the embodiments of the present invention.
  • Fig-9 shows the partial rings for constructing the Coiled Felt Seal (CFS) that is adopted on a hydraulic cylinder piston or on a spool of a spool type hydraulic control valve in accordance with the embodiments of the present invention.
  • CFS Coiled Felt Seal
  • Hydraulic Cylinder with CFS Sealed Piston CFS seal, Coiled Felt Seal is a metallic helical coiled dynamic seal that is applied to the technical field of the present invention. It is aimed to improve the performance of the hydraulic cylinder by using CFS on both piston and piston rod.
  • Fig-1 shows the cut out view of the hydraulic cylinder assembly structure in accordance with an embodiment of the present invention.
  • CFS seal(08) on piston(05) instead of 11 different functioning rubber O-rings in conventional art.
  • CFS seal(12) on piston-rod seal block(04) instead of 5 different functioned rubber O-rings in conventional art.
  • CFS piston seal(08) is mounted on piston block(06) and the compression spring(09) that inserted in the spring holes on compression ring(09) provides force on CFS to keep the source rings of the CFS piston seal(08) tightly contacted.
  • piston block(06) and piston-rod(05) Sealing between piston block(06) and piston-rod(05) is done by rubber O-rings(20) and the bolts(lO) hold piston block(06) and compression ring(09) together tightly, and the rod nut(l l) holds piston block (06) and compression ring(09) on the piston rod(05).
  • Link-end(02) of the cylinder(Ol) is fastened to the cylinder by tie bolts(17).
  • Link-end(03) of the piston-rod(05) is fastened to the piston-rod(05) by own screw thread made both on the tie-end(03) and the piston-rod(05).
  • the piston-rod seal block(04) is fastened to the cylinder(Ol) by tie bolts(16).
  • the piston-rod seal(12) is installed on the inside of the piston-rod seal block(04) and the compression spring(14) that inserted in the spring holes on compression ring(14) provides force on CFS piston-rod seal(12) to be strongly compressed to keep the source rings of the CFS tightly contacted.
  • Fig-2 shows the cut out view of overall schematic of hydraulic cylinder assembly in accordance with the conventional art.
  • Fig-2 there are 11 different functioning O-rings on piston block(25) instead of only one CFS seal(8) in the embodiment of the present invention.
  • Fig-2 shows 11 different functioning O-rings on piston block(25) each of which is retaining ring(34), seal ring(35), seal ring(36), back-up ring(37), slip ring(38), cushion ring(39), wear ring(40), cushion ring(41), back-up ring(42), seal ring(43) and retaining ring(44).
  • Fig-2 also shows 5 different functioning O-rings on piston-rod-seal-block(50) instead of only one CFS seal ring(12) according to the present invention each of which is retaining ring(45), seal ring(46), U-packing(47), retaining ring(48) and dust wiper(49).
  • Fig-3 shows the enlarged detail of the rubber O-rings before and after inserted in the cylinder according to an embodiment of the present invention.
  • the lower part of Fig-3 shows two rubber O-rings installed in the O-ring groove to have sealing function seal ring(35) and another seal ring(36) which shows perfect natural circle which shall be forced press flattened to insert in between cylinder tube(24) and piston block(25) with back-up ring(37) in conventional art.
  • Fig-3 shows two rubber O-rings installed in the O-ring groove to have sealing function seal ring(35) and another seal ring(36) which shows flattened oval circle with back-up ring(37) after insert in between cylinder tube(24) and piston block(25) in conventional art.
  • This recovering force of rubber also causes the friction between cylinder tube(24) and piston block(25) in conventional art during functioning of sealing.
  • CFS seal in hydraulic cylinder assembly on piston seal and piston rod seal reduces the friction loss during reciprocation of piston, thereby resulting in longer life of the hydraulic cylinder and lowering manufacturing cost due to reducing the number of parts.
  • Fig-4 is the schematic cutout view of a spool type control valve which is currently used in control of pneumatic system for pressure not higher than 30 bar.
  • a long cylindrical hole(19) is made inside of the valve block(Ol) in which the valve spool(02) shall be inserted which has six grooves(17) and on each groove(17) rubber 0-ring(18) shall be assembled to isolate or connect valve ports by shifting of spool(02) location by the logic controller of compressed air in the pneumatic system.
  • Piston(l l) is pushed outward as direction arrow(16) by the air in the cylinder(lO) by the force of air flow arrow(14).
  • FIG-4 shows how the piston(l l) could be moved to have actuator motion to either direction forward arrow(16) direction and backward arrow(25) direction by the shifting of the spool(02) location in the valve block(Ol).
  • Fig-5 is the enlarged cutout view of valve body, spool, rubber O-rings that shows how the rubber O-ring could be torn out by the sharp edge of the drilled hole in valve body when the sharp edge of the drilled holes are not chamfered.
  • Rubber O-rings are assembled on the grooves(31) of the valve spool(29) and the rubber O-ring must be compressed as shown compressed 0-ring(32) that became oval shape cross section to make the outside diameter smaller to force insert into the valve bore(30) that is smaller diameter than the free condition of rubber O-ring so as to let rubber O-ring have 3 dimensional expanding force to keep contact under certain contacting force simultaneously with bore(30) and spool(29) that called sealing.
  • the rubber 0-ring(34) could come to the location as drawing in Fig-5 right on the drilled hole(34) location which makes rubber O-ring return to original true circle as shown by 0-ring(38) on the position where there is no wall of bore(30) so if the spool(29) is pushed to rightward direction to make the edge of the rubber-O-ring (37) as depicted to meet sharp corner(36) of the drilled hole(35) the 0-ring(37) will be sheared by the sharp corner(36) of bore(30) and 0-ring(37) will be torn out at the point of sharp corner(36) which damages sealing function of spool.
  • valve bore must pass all the procedures from boring, reaming, grinding and honing through out entire processes.
  • the alloy of the valve body should be selected that could maintain lowest thermal expansion coefficient to keep possible for least dimensional change under wide range of temperature change to prevent the spool in the bore from stick in the position.
  • the valve body should pass the extreme grade heat treatment to maintain lowest thermal deformation along with wide variety of temperature that causes high cost from the first and those alloys passing extreme heat treatment having extra high strength and hardness that makes difficult in all subsequent process from drilling and boring that causes another cost push and difficulties in quality control.
  • Fig-6 shows the cutout view of the valve assembly with metallic O-ring seal on the spool for any high pressure application.
  • a long cylindrical hole(42) is made inside of the valve block(39) in which the valve spool(40) shall be inserted.
  • Metallic O-ring(60) is constructed by 3 different functioning layer of rings each of which are cylinder seal layer, absorption layer and shaft seal layer constructed all in one not separable single piece of O-ring(60).
  • the cylinder seal layer seals the cylinder wall only without contacting shaft in any condition
  • absorption layer absorbs any and all dimensional variations during dynamic movement of the shaft and the shaft seal layer seals shaft only without contacting cylinder in any condition.
  • Fig-6 shows how the piston(44) could be moved to have actuator motion to either direction forward arrow(59) direction and backward arrow(55) direction by the shifting of the spool (40) location in the valve block(39).
  • Fig-7 shows the enlarged cutout view of the valve block(62) with the inserted spool(63) on which separation sleeves(64) and metallic sealing 0-rings(65 and 67) are assembled and located right at the location to meet drilled hole(66) of the valve that is not chamfered.
  • the metallic sealing 0-ring(65 and 67) has radial tension which means the ring could be expanded to have slightly bigger diameter or contracted to have slightly smaller diameter by its radial tension but each points on the ring circumference of metal ring can not rise or dimple down like the rubber O-ring surface which should be changed its surface shape when the contacting surface changes.
  • Fig-8 shows a Coiled Felt Seal (CFS) that is adopted on a hydraulic cylinder piston or on a spool of a spool type hydraulic control valve in accordance with the embodiments of the present invention.
  • CFS Coiled Felt Seal
  • the CFS consists of 3 different functioned layers each of which are piston seal layer (801), absorption layer (802), and cylinder seal layer (803).
  • the outside diameter of piston seal layer (801) is made smaller (e.g.: 1% less) than cylinder bore to keep away from cylinder wall and the inside diameter is made slightly smaller (e.g. : 0.1% less) than the piston to keep contact of piston at all time.
  • the outside diameter of the absorption layer (802) is made smaller (e.g.: 1% less) than cylinder bore and the inside diameter is made larger (e.g. : 1% more) than the piston to keep the absorption layer (802) from contacting the cylinder wall and the piston surface.
  • cylinder seal layer (803) is made slightly larger (e.g.: 0.1% more) than cylinder bore to keep contact wall at all time but the inside diameter is made larger (e.g.: 1% more) than the piston diameter to make it never be able to contact the piston.
  • This invention uses CFS to replace the rubber O-rings from conventional art.
  • the CFS is able to provide all of the functions that rubber O-rings from conventional art provides but having minimal operating friction and able to provide substantially zero leak function.
  • CFS has multiple lines of seal as failsafe system with substantially zero-leak-seal to ensure perfect performance.
  • CFS is made of fast heat transmitting bronze or brass that cools more effectively and the soaked lubricant between layers of CFS guarantee best form of lubrication for friction free seal.
  • CFS is a helical metal seal constructed by joining of partial rings (804).
  • the partial rings are connected by complementary interlocking structure (805), for example, dovetail connection.
  • complementary interlocking structure (805) for example, dovetail connection.
  • Fig-9 shows the partial rings for constructing the Coiled Felt Seal (CFS) that is adopted on a hydraulic cylinder piston or on a spool of a spool type hydraulic control valve in accordance with the embodiments of the present invention.
  • the partial rings are connected by complementary interlocking structure (901), (902) at the end of each partial ring.
  • the complementary interlocking structure (901), (902) offsets towards the exterior circumference of the partial ring differently for identifying itself as the corresponding layer in the Coiled Felt Seal.
  • the CFS is made of helical coiled metal tube that is constructed by connecting individual C-rings.
  • Each of these C-rings has male and female dovetails at both ends and they are to be connected progressively to construct a helical coiled tube.
  • the location of the dovetail joint on the C-ring is different on each of the 3 different functional layers.
  • the dovetail joint On the piston seal layer, the dovetail joint is adjacent to the inner circumference, while on the cylinder seal layer, the joint is adjacent to the outer circumference.
  • the dovetail joint is in the middle of the ring. The location differences are for easy identification of each layer during the manufacturing process, as the C-rings of different layers are very difficult to distinguish once they are mixed together.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Sealing Devices (AREA)

Abstract

L'invention concerne un actionneur hydraulique comprenant, un joint d'étanchéité métallique multicouche à enroulement spiralé (8, 12) destiné à assurer l'étanchéité entre deux parties se déplaçant l'une par rapport à l'autre; un ensemble vérin hydraulique dans lequel le joint d'étanchéité métallique multicouche à enroulement spiralé est conçu pour assurer l'étanchéité d'un piston et d'une tige de piston; et un distributeur de commande hydraulique de type à tiroir dans lequel le joint d'étanchéité métallique multicouche à enroulement spiralé est destiné à assurer l'étanchéité du tiroir. L'invention permet de surmonter les limitations de température et de pression et d'éliminer la totalité des joints toriques en caoutchouc des actionneurs hydrauliques de l'état de la technique.
PCT/CN2012/071603 2011-02-25 2012-02-24 Vérin hydraulique et distributeur de commande hydraulique de type à tiroir à bague d'étanchéité WO2012113349A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US201161446502P 2011-02-25 2011-02-25
US61/446,502 2011-02-25
US201261592363P 2012-01-30 2012-01-30
US61/592,363 2012-01-30

Publications (1)

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WO2012113349A1 true WO2012113349A1 (fr) 2012-08-30

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018060458A1 (fr) * 2016-09-30 2018-04-05 Avl List Gmbh Bielle réglable en longueur comprenant des surfaces de butée
CN109312862A (zh) * 2016-03-15 2019-02-05 昱曦机械高新科技有限公司 一种用于桶形气缸的密封件
US10669930B2 (en) 2015-08-10 2020-06-02 Avl List Gmbh Reciprocating piston machine comprising a length adjustable connecting rod and an inductively actuatable control valve
US10738690B2 (en) 2016-07-06 2020-08-11 Avl List Gmbh Connecting rod having an adjustable connecting rod length with a mechanical actuating means
US10876474B2 (en) 2016-05-31 2020-12-29 Avl List Gmbh Length-adjustable connecting rod, device for setting a compression ratio and internal combustion engine
US10954849B2 (en) 2015-12-14 2021-03-23 Avl List Gmbh Length-adjustable connecting rod with electromagnetically-actuatable switching valve
US11066987B2 (en) 2017-02-24 2021-07-20 Avl List Gmbh Method for operating a reciprocating piston machine having at least one piston rod that is hydraulically adjustable in length
CN115899012A (zh) * 2023-02-28 2023-04-04 仪征天华活塞环有限公司 一种活塞密封结构及活塞装置

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US3968971A (en) * 1973-05-22 1976-07-13 Automatisation - Sogemo Fluid-tight packing
US4333661A (en) * 1980-12-05 1982-06-08 Hughes Aircraft Company Expanding helical seal for pistons and the like
WO1997000398A1 (fr) * 1995-06-16 1997-01-03 Management Consultancy Services (Scotland) Ltd. Joint fendu ameliore
CN2580214Y (zh) * 2002-10-23 2003-10-15 中国第一汽车集团公司 复合密封圈
CN2687433Y (zh) * 2004-02-23 2005-03-23 十堰市振兴机械厂 活塞的密封结构
US20060213192A1 (en) * 2005-03-24 2006-09-28 Henifin Philip S Hydraulic cylinder with coaxial, in-line reservoir
US20090178554A1 (en) * 2008-01-16 2009-07-16 Stabilus Gmbh Piston-Cylinder Unit

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3968971A (en) * 1973-05-22 1976-07-13 Automatisation - Sogemo Fluid-tight packing
US4333661A (en) * 1980-12-05 1982-06-08 Hughes Aircraft Company Expanding helical seal for pistons and the like
WO1997000398A1 (fr) * 1995-06-16 1997-01-03 Management Consultancy Services (Scotland) Ltd. Joint fendu ameliore
CN2580214Y (zh) * 2002-10-23 2003-10-15 中国第一汽车集团公司 复合密封圈
CN2687433Y (zh) * 2004-02-23 2005-03-23 十堰市振兴机械厂 活塞的密封结构
US20060213192A1 (en) * 2005-03-24 2006-09-28 Henifin Philip S Hydraulic cylinder with coaxial, in-line reservoir
US20090178554A1 (en) * 2008-01-16 2009-07-16 Stabilus Gmbh Piston-Cylinder Unit

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10669930B2 (en) 2015-08-10 2020-06-02 Avl List Gmbh Reciprocating piston machine comprising a length adjustable connecting rod and an inductively actuatable control valve
US10954849B2 (en) 2015-12-14 2021-03-23 Avl List Gmbh Length-adjustable connecting rod with electromagnetically-actuatable switching valve
CN109312862A (zh) * 2016-03-15 2019-02-05 昱曦机械高新科技有限公司 一种用于桶形气缸的密封件
CN109312862B (zh) * 2016-03-15 2020-09-04 昱曦机械高新科技有限公司 一种用于桶形气缸的密封件
US10876474B2 (en) 2016-05-31 2020-12-29 Avl List Gmbh Length-adjustable connecting rod, device for setting a compression ratio and internal combustion engine
US11199130B2 (en) 2016-05-31 2021-12-14 Avl List Gmbh Length-adjustable piston rod with a control device that can be hydraulically actuated and a switching valve that can be electromagnetically actuated, a reciprocating piston engine and a vehicle
US10738690B2 (en) 2016-07-06 2020-08-11 Avl List Gmbh Connecting rod having an adjustable connecting rod length with a mechanical actuating means
WO2018060458A1 (fr) * 2016-09-30 2018-04-05 Avl List Gmbh Bielle réglable en longueur comprenant des surfaces de butée
US11066987B2 (en) 2017-02-24 2021-07-20 Avl List Gmbh Method for operating a reciprocating piston machine having at least one piston rod that is hydraulically adjustable in length
CN115899012A (zh) * 2023-02-28 2023-04-04 仪征天华活塞环有限公司 一种活塞密封结构及活塞装置

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