Wear and influence of automobile engine piston ring

Ford
Tempo Timing Chain Kit/kit de distribución/kit de distribution Contour Timing Chain Kit/kit de distribución/kit de distribution Probe Timing Chain Kit/kit de distribución/kit de distribution Thunderbird Timing Chain Kit/kit de distribución/kit de distribution Ford Mustang Timing Chain Kit/kit de distribución/kit de distribution Mustang Gt Timing Chain Kit/kit de distribución/spannrollen kit Ford 5.0(302) H/O V8 1980-1988 Timing Chain Kit/kit de distribución/spannrollen kit Ford Motors Timing Chain Kit/kit de distribución/spannrollen kit Ford Explorer Timing Chain Kit/kit de distribución/kit de distribution Ford Ranger Timing Chain Kit/kit de distribución/kit de distribution Ford 5.4-L,M,Z,3(330) V8 2001 Timing Chain Kit/kit de distribución/kit de distribution Ford Timing Chain Kit Mustang Timing Chain Kit/kit de distribución/kit de distribution Cht1300 Timing Chain Kit 76394/kit de distribución/kit de distribution Courier Timing Chain Kit Ford Trucks For Sale Timing Chain Kit Ford Taurus Timing Chain Kit/kit de distribución/kit de distribution Focus Timing Chain Kit/kit de distribución/kit de distribution Ecosport Timing Chain Kit/kit de distribución/spannrollen kit Ford Transit Timing Chain Kit Ford 184 90Ps Y.M. Timing Chain Kit Ford 184 120Ps Y.M. Timing Chain Kit Transit V 347 2.2TDCI 3.2TDCI 2006-Fiesta Timing Chain Kit Ford 4.6L 281 Dohc 1998-2000 Timing Chain Kit Ford Truck 4.6L 281 2001-2002 Timing Chain Kit Ford 4.6L 281 2003-2005 Timing Chain Kit Ford Truck 5.4L 330 Dohc 98-00 Timing Chain Kit Ford Truck 5.4L 330 Dohc 2001-2002 Timing Chain Kit Ford 5.4L 330 Dohc 1998-2000 Timing Chain Kit Rangers Timing Chain Kit Galaxy Timing Chain Kit Ford Trans V.347 2.4 Timing Chain Kit/kit de distribución/kit de distribution Edge Timing Chain Kit/kit de distribución/kit de distribution Ford Racing 4.6-X(281) Sohc 2005-10 Timing Chain Kit BK3Q6268AA 132L 1704089Transit 2.4 Tdci H9Fb 2006.11- Timing Chain Kit/kit de distribución/spannrollen kit Sierra Scopio Timing Chain Kit Ford Fiesta Timing Chain Kit Ford Transit 2.2L MK7 Timing Chain Kit TCK130/kit de distribución/spannrollen kit Ford 5.4L Expedition Timing Chain Kit/kit de distribución/kit de distribution Ford Mondeo Timing Chain Kit Explorer Timing Chain Kit/kit de distribución/kit de distribution Ford F150 Timing Chain Kit/kit de distribución/kit de distribution Ford C Max Timing Chain Kit/kit de distribución/kit de distribution Ford Focus Rs Timing Chain Kit/kit de distribución/spannrollen kit 2013 Mustang Timing Chain Kit/kit de distribución/kit de distribution 2010 Ford F150 Timing Chain Kit/kit de distribución/kit de distribution E250 Timing Chain Kit/kit de distribución/spannrollen kit FIESTA 1.5L 1496CC YZJA 19-FD069 V timing chain kit/kit de distribución/kit de distribution fiesta 1.5l 1496cc yzja 19 FD069 timing chain kit/kit de distribución/kit de distribution
BMW
2006-2009 New Auto Bmw Mini Cooper Clubman Convertible 1.6L Timing Kit/kit de distribución/spannrollen kit Mini cooper clubman R55 R56 1.6L 2.0L Timing Kit/kit de distribución/spannrollen kit Timing chain kit fit bmw 3 series bmw 5 series z3 e46 e34 e36 for sale/kit de distribución/kit de distribution BMW Timing Chain Kit/kit de distribución/kit de distribution Cooper Timing chain kit/kit de distribución/kit de distribution BMW E30 Timing chain kit/kit de distribución/spannrollen kit BMW 1 Timing chain kit/kit de distribución/spannrollen kit BMW 3 Series Timing chain kit/kit de distribución/kit de distribution BMW Z4 Timing chain kit/kit de distribución/kit de distribution Mini Clubman Timing chain kit/kit de distribución/spannrollen kit
Benz
Timing Chain Kit,kit de distribución,kit de distribution Mercedes Smart Timing Chain Kit/kit de distribución/kit de distribution Mercedes Vaneo Timing Chain Kit/kit de distribución/kit de distribution E 250 Timing Chain Kit/kit de distribución/kit de distribution Mercedes OM668.940 Timing Chain Kit/kit de distribución/kit de distribution Master Timing Chain Kit/kit de distribución/kit de distribution Mercedes-benz OM640.942 Timing Chain Kit/kit de distribución/kit de distribution Mercedes Benz A Class Timing Chain Kit/kit de distribución/kit de distribution Smart Cabrio Timing Chain Kit/kit de distribución/kit de distribution Mercedes benz E200 Timing Chain Kit/kit de distribución/kit de distribution E Class Mercedes Timing Chain Kit/kit de distribución/kit de distribution Mercedes 180 Timing Chain Kit/kit de distribución/kit de distribution Mercedes Benz Parts Timing Chain Kit/kit de distribución/kit de distribution
Opel
Astra Timing Chain Kit Opel Astra G Timing Chain Kit Vauxhall Astra Timing Chain Kit Vauxhall Vivaro Timing Chain Kit Vauxhall Zafira Timing Chain Kit Opel Corsa A14NET Timing Chain Kit Opel K12B Timing Chain Kit Opel Zafira Timing Chain Kit Vauxhall Signum Timing Chain Kit Opel Omega B Timing Chain Kit Opel Zafira Timing Chain Kit
Honda
Honda S2000 Timing Chain Kit Honda Timing Chain Kit Honda Civic Timing Chain Kit Honda Civic Hybrid Timing Chain Kit Honda Fit & Fit Sport Timing Chain Kit Honda City Timing Chain Kit Accord Timing Chain Kit Honda Cars Timing Chain Kit Honda Accord Timing Chain Kit S2000 2Dr Base 2.0L Ka6Mt Timing Chain Kit Honda S2000 2.0L F20C1/C2 Timing Chain Kit
Mitusibishi
Mitsubishi Pick Up Timing Chain Kit Mitsubishi Pajero Timing Chain Kit Mitsubishi Montero Timing Chain Kit Mitsubishi Shogun Timing Chain Kit Mitsubishi Lancer Timing Chain Kit Auto Mitsubishi Timing Chain Kit Mitsubishi Mirage Timing Chain Kit
Nissan
Timing Chain Kit /kit de distribución/kit de distribution Cherry Timing Chain Kit/kit de distribución/kit de distribution Homer Timing Chain Kit/kit de distribución/kit de distribution Atlas Timing Chain Kit/kit de distribución/kit de distribution Nissan Almera Timing Chain Kit/kit de distribución/kit de distribution Nissan Sunny Timing Chain Kit/kit de distribución/kit de distribution Nissan Cedric Timing Chain Kit/kit de distribución/kit de distribution Bluebird Timing Chain Kit/kit de distribución/kit de distribution Nissan Serena Timing Chain Kit/kit de distribución/kit de distribution Nissan Frontier Timing Chain Kit/kit de distribución/kit de distribution Nissan 240Sx For Sale Timing Chain Kit/kit de distribución/kit de distribution Nissan Altima Timing Chain Kit/kit de distribución/kit de distribution Nissan Navara Timing Chain Kit/kit de distribución/kit de distribution Nissan Pathfinder Timing Chain Kit/kit de distribución/kit de distribution Timing chain kit fit for Nissan Z24/kit de distribución/kit de distribution Nissan Patrol Timing Chain Kit/kit de distribución/kit de distribution Nissan Vanette Timing Chain Kit/kit de distribución/kit de distribution Leopard Timing Chain Kit/kit de distribución/kit de distribution Nissan QG15DE QG18DE Timing Chain Kit/kit de distribución/kit de distribution Altima X-Trail QR20DE Timing Chain Kit/kit de distribución/kit de distribution Nissan QR25DE Timing Chain Kit/kit de distribución/kit de distribution Nissan Note Timing Chain Kit/kit de distribución/kit de distribution Nissan Micra Timing Chain Kit/kit de distribución/kit de distribution Nissan Caravan Timing Chain Kit/kit de distribución/kit de distribution Nissan Cabstar Timing Chain Kit/kit de distribución/kit de distribution 2005 Nissan Altima Timing Chain Kit/kit de distribución/kit de distribution Nissan 350Z Timing Chain Kit/kit de distribución/kit de distribution Nissan Juke Timing Chain Kit/kit de distribución/kit de distribution Nissan Maxima Timing Chain Kit/kit de distribución/kit de distribution Nissan VH45De 4494CC V8 1990-96 Timing Chain Kit/kit de distribución/kit de distribution Nissan Tiida Timing Chain Kit/kit de distribución/kit de distribution 2006 Nissan Altima Timing Chain Kit/kit de distribución/kit de distribution Nissan Presage Timing Chain Kit/kit de distribución/kit de distribution Navara Timing Chain Kit/kit de distribución/kit de distribution Nissan Armada VK56DE Timing Chain Kit/kit de distribución/kit de distribution Nissan Xterra Timing Chain Kit/kit de distribución/kit de distribution Nissan NA16 Sohc 8V 1.6L 1992-1999 Timing Chain Kit/kit de distribución/kit de distribution Nissan H20 Timing Chain Kit/kit de distribución/kit de distribution Nissan VK45DE Infinity 2002-09 Timing Chain Kit/kit de distribución/kit de distribution Nissan KA20De D22 Lpd22 1999 Timing Chain Kit/kit de distribución/kit de distribution Nissan VQ35DE 2001-04 Pathfider Timing Chain Kit/kit de distribución/kit de distribution Nissan Qashqai Timing chain kit/kit de distribución/kit de distribution Nissan Y61 GRL Timing Chain Kit/kit de distribución/kit de distribution Silvia Timing Chain Kit/kit de distribución/kit de distribution
Toyota
Toyota Corolla Timing Chain Kit Toyota Starlet Timing Chain Kit Toyota Carina Timing Chain Kit Toyota 20R 21R Corona Timing Chain Kit Toyota Land Cruiser Timing Chain Kit Toyota Hiace Timing Chain Kit Toyota Hilux Timing Chain Kit Toyota Celica Timing Chain Kit Toyota Estima Timing Chain Kit Toyota Hilux For Sale Timing Chain Kit Toyota 1RZ Timing Chain Kit Toyota Echo Timing Chain Kit Toyota Verso Timing Chain Kit Toyota 1ZRFE Timing Chain Kit Toyota 1AZ-FE 2AZ-FETiming Chain Kit Lexus Lx450 Timing Chain Kit Toyota Matrix Timing Chain Kit Toyota Tacoma Timing Chain Kit Toyota Fj Cruiser Timing Chain Kit Toyota Highlander Timing Chain Kit Toyota Highlander For Sale Timing Chain Kit Toyota 5GR-FE Timing Chain Kit Toyota Aygo Timing Chain Kit Toyota Auris Timing Chain Kit Toyota Accessories Timing Chain Kit Toyota Vitz Timing Chain Kit Hilux Tacoma Timing Chain Kit Toyota Yaris For Sale Timing Chain Kit Toyota Lexus Timing Chain Kit 2012 Toyota Camry Timing Chain Kit Toyota Sequoia Timing Chain Kit Toyota 3UR-FE Timing Chain Kit Toyota Corolla 2008 Timing Chain Kit Toyota 1zz 1ZZ-FE/3ZZ-FE/4ZZ-FE engine timing chain kits
Suzuki
Suzuki Sx4 Timing Chain Kit Grand Vitara 2005 Timing Chain Kit Suzuki Splash Timing Chain Kit Suzuki Ignis Timing Chain Kit Suzuki Jimny Timing Chain Kit 2004 Suzuki Verona Timing Chain Kit Suzuki Timing Chain Kit Suzuki Grand Vitara For Sale Timing Chain Kit Suzuki K14B Timing Chain Kit Suzuki Grand Vitara 2012 Timing Chain Kit Suzuki Xl7 Timing Chain Kit
Mazda
Mazda Timing Chain Kit Mazda B2300 Pick-Up Timing Chain Kit Mazda 2.3L L3V ,L3X Timing Chain Kit Tribute Timing Chain Kit Tribute Hybrid Timing Chain Kit Mazda 5 Timing Chain Kit Mazda B2600 Timing Chain Kit Auto Mazda Timing Chain Kit Navajo Timing Chain Kit Mazda 4.0(244) V6 1995-2000 Timing Chain Kit Mazda 3 Timing Chain Kit 2010 Mazda 3 Timing Chain Kit Mazda6 Timing Chain Kit Mazda 2 Timing Chain Kit Mazda Cx 7 Timing Chain Kit Mazda Protege Timing Chain Kit Mazda 2.0L IVCT TURBO 2012-2015 Timing Chain Kit
Daihastu
Terios Timing chain kit Daihatsu Timing chain kit
Isuzu
Isuzu Timing Chain Kit Isuzu Impulse Timing Chain Kit Isuzu Trooper Timing Chain Kit Isuzu Hombre Timing Chain Kit Isuzu G161Z Timing Chain Kit Isuzu Ascender Timing Chain Kit
Hyundai
Elantra Timing Chain Kit Hyundai Getz Timing Chain Kit Hyundai Motors Timing Chain Kit Tiburon Timing Chain Kit Hyundai 2.0L G4Gc Timing Chain Kit Hyundai Tucson Timing Chain Kit Hyundai Santa Fe Timing Chain Kit Hyundai G4FA Timing Chain Kit Hyundai G4KD Timing Chain Kit Hyundai Timing Chain Kit Hyundai Accent Timing Chain Kit Genesis Timing Chain Kit Hyundai Sonata Timing Chain Kit Hyundai Hb20 Timing Chain Kit Hyundai IX35 Timing Chain Kit
Iveco
Iveco Diesel 3000Cc Enging Code F1Ce0481 Timing Chain Kit
Jeep
Jeep Cherokee Timing Chain Kit Jeep 4.0(242) 6 Cyl. 87-93 Timing Chain Kit Jeep Wrangler Timing Chain Kit Cherokee Jeep Timing Chain Kit Grand Cherokee Timing Chain Kit Jeep Timing Chain Kit Dakota Dodge Timing Chain Kit Ram Trucks 2002 Timing Chain Kit Jeep 4.7-J,N 2002-08 Timing Chain Kit Jeep Commander Timing Chain Kit Jeep Grand Cheroke 3.0L 3.2L 3.6L Timing Chain Kit Jeep Grand Cherokee Timing Chain Kit
Kia
Kia Timing Chain Kit Kia Picanto Timing Chain Kit Kia Motors Timing Chain Kit Kia Auto Timing Chain Kit Entourage Timing Chain Kit
Chevrolet
Chevrolet 1ZZFE Timing chain kit Chevy Timing Chain Kit Equinox Timing Chain Kit Malibu Timing Chain Kit Beretta Timing Chain Kit Chevy Malibu Timing Chain Kit Citation Timing Chain Kit C368 Cavalier Timing Chain Kit C372 Camaro Timing Chain Kit C373 Impala Timing Chain Kit Monte Carlo Timing Chain Kit C499 Chevrolet 5.0 Timing Chain Kit C506 Chevrolet 1.9L 119 4Cyl 82-85 Timing Chain Kit Corsica Timing Chain Kit Chevy Impala Timing Chain Kit Express Timing Chain Kit Heavy Duty Timing Chain Kit Chevrolet 5.7 Timing Chain Kit 73069 Chevrolet Heavy Duty Timing Chain Kit Chevrolet 6.2 Timing Chain Kit Suburban Timing Chain Kit Chevrolet Avalanche Timing Chain Kit Trailblazer Timing Chain Kit Chevrolet Blazer Timing Chain Kit Caprice Timing Chain Kit Chevy Colorado Timing Chain Kit Canyon Timing Chain Kit Chevy Equinox Timing Chain Kit Chevy Traverse Timing Chain Kit Pontiac Timing Chain Kit Monte Timing Chain Kit Chevrolet C14/C15/C16/B15/B16 Timing Chain Kit Chevrolet Z22 Yh Timing Chain Kit Spark Timing Chain Kit Corvette Timing Chain Kit
Citroen
Citroen berlingo Timing chain kit Citroen C4 Timing chain kit Citroen C3 Timing chain kit Citroen C1 1.0 1KR-FE 2005.6- Timing chain kit RELAY 2.2 HDi 4HV 4HU Timing chain kit Citroen c5 Timing chain kit
Audi
Audi Timing Chain Kit Audi EA111 timing chain kit Golf Timing chain kit Audi A6 EA888 Timing chain kit Audi A4 A6 2.0TDI Oil Pump Chain tensioner kit Audi Quattro Timing Chain Kit Audi A4 Timing chain kit A6 Audi Timing chain kit Audi A6 Timing chain kit Audi TT Quattro Timing Chain Kit Audi A6 Avant Timing Chain Kit
Peugeot
Peugeot 405 Timing Chain Kit Peugeot 207 Timing Chain Kit 307 Estate Timing Chain Kit Peugeot 3008 Timing Chain Kit Peugeot 107 Timing Chain Kit Peugeot 4Hu Timing Chain Kit Estate Timing Chain Kit
Renault
Renault Timing Chain Kit TCK58Renault Megane Timing Chain Kit
Chrysler
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Volkswagen
Volkswagen Polo Timing Chain Kit/kit de distribución/kit de distribution/kit de distribución/kit de distribution BMD Timing Chain Kit/kit de distribución/spannrollen kit VW Golf Plus Timing Chain Kit/kit de distribución/spannrollen kit Volkswagen EA888 Timing Chain Kit/kit de distribución/spannrollen kit Volkswagen Passat Oil pump chain kit/kit de distribución/spannrollen kit Volkswagen Bora Timing Chain Kit/kit de distribución/kit de distribution VW Transporter For Sale Timing Chain Kit/kit de distribución/spannrollen kit VW EOS Timing Chain Kit/kit de distribución/kit de distribution Volkswagen Jetta Timing Chain Kit/kit de distribución/kit de distribution Volkswagen Passat Timing Chain Kit/kit de distribución/kit de distribution Volkswagen Phaeton Timing Chain Kit/kit de distribución/kit de distribution
Dodge
Dodge Pickup Timing Chain Kit Dodge Magnum Timing Chain Kit Dodge Intrepid Timing Chain Kit Dodge Trucks Timing Chain Kit 76155 Dodge Dakota Timing Chain Kit Dakota Timing Chain Kit 9-0393S Durango Timing Chain Kit Dodge Parts Timing Chain Kit Dynasty Timing Chain Kit Ram 1500 Timing Chain Kit Dodge Journey Timing Chain Kit ,Dodge Caliber Timing Chain Kit Dodge Caravan Timing Chain Kit Dodge 1500 Timing Chain Kit Caravan Timing Chain Kit Dodge Grand Caravan Timing Chain Kit 2013 Dodge Charger Timing Chain Kit
Fiat
Strada Timing Chain Kit Ducato Timing Chain Kit Palio Timing Chain Kit 500 Fiat Timing Chain Kit Fiat Croma Timing Chain Kit Croma Timing Chain Kit Ducato Timing Chain Kit
Acura
K24A2 Honda Parts Acura Tsx Element Timing Chain Kit 2002-2006 KA20A Honda Acura RSX Type S Timing Chain Kit for Sale 2009-2010 KA5AT KA6MT Honda Accord Timing Chain Kit
Alfa romeo
Alfa Romeo 2198CC Brera 2.2JTS 2006.1 Timing chain kit Alfa Romeo Spider (939)2.2JTS 2006.9 Balance kit Alfa Romeo Mito Timing chain kit
American motors
American Motors 2.5-U(150) 4 Cyl. 1983-1987 Timing chain kit American Motors 2.8(173) V6 1985-86 Timing chain kit
Cadillac
Cimarron Timing Chain Kit Cimarron 2.8-W(173) V6 85-88 Timing Chain Kit Cadillac Timing Chain Kit Eldorado Timing Chain Kit
Cam Phaser VVT
VVT gear for European vehicle VVT gear for American vehicle VVT gear for Asian vehicle 03C109088B 03C109088E 03C109088F VVT gear Cam phaser for Volkswagen EA111
Daimler
Daimler Jaguar Timing Chain Kit
General motors
Gm Timing Chain Kit
Hummer
Hummer Timing Chain Kit Canyon 2007-10 Timing Chain Kit Hummer H3 Timing Chain Kit Hummer 6.0L 366Ci Lq4 V8 2003-07 Timing Chain Kit
Infiniti
Infinity Timing Chain Kit Infiniti Cars Timing Chain Kit Infinity I35 Timing Chain Kit Infiniti Fx35 Timing Chain Kit Infinity Car Timing Chain Kit Infinity VK45DE FX45 M45 Q45 Timing Chain Kit Armada Timing Chain Kit
Buick
Skylark 2.0-B,P Timing chain kit Buick Century Timing Chain Kit Somerset Timing Chain Kit Skylark 2.3-D Timing Chain Kit Skylark 2.4-T Timing Chain Kit Buick 2.4-T(146) Dohc 4 Cyl.1997-02 Timing Chain Kit Regal Timing Chain Kit Century Skylark 2.8-S,X,Z Timing Chain Kit Buick Lesabre Timing Chain Kit Buick Regal Timing Chain Kit Buick 3.2(196) V6 1978-1979 Timing Chain Kit Century Timing Chain Kit Park Ave 3.8 Timing Chain Kit Buick Rendezvous Timing Chain Kit Buick Lacrosse Timing Chain Kit Buick Terraza Timing Chain Kit
Jaguar
Jaguar Timing Chain Kit Jaguar Cars Timing Chain Kit
LTI
LTI Timing Chain Kit
Lincoln
Lincoln Timing Chain Kit Lincoln Cars Timing Chain Kit Lincoln Mkz Timing Chain Kit Milan Timing Chain Kit Contour Timing Chain Kit Auto Lincoln Timing Chain Kit Zephyr Timing Chain Kit
LDV
Ldv Timing Chain Kit
Lotus
Lotus Timing Chain Kit
Lexus
Lexus 3Gr-Fe Timing Chain Kit Toyota Land Cruiser For Sale Timing Chain Kit GS350 Timing Chain Kit Lexus Cars Timing Chain Kit Lexus 570 Timing Chain Kit
Lancia
Lancia Timing Chain Kit
Roewe
Roewe 350 1.5L Timing Chain Kit
Saab
Saab Timing Chain Kit Saab 93 Timing Chain Kit Saab 9000 Timing Chain Kit
Saturn
Saturn Timing Chain Kit Saturn Sci Timing Chain Kit Saturn Sc2 Timing Chain Kit Saturn 1.9L L4 Sl1 Timing Chain Kit

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Wear and influence of automobile engine piston ring

2021-08-03

1. The piston ring reciprocates between the top and bottom dead points, and the speed changes from a static state to about 30m/s, and it changes greatly in this way.

2. When doing reciprocating motion, the cylinder pressure changes greatly during the intake, compression, work and exhaust strokes of the working cycle.

3. Because of the influence of the combustion stroke, the movement of the piston ring is often carried out at high temperature, especially the gas ring. Under the chemical action of high temperature and high pressure and combustion products, the oil film is difficult to establish, so that it can achieve complete lubrication. Difficult, and often in a state of critical lubrication.
Among them, the material and shape of the piston ring, the material and structure of the cylinder liner piston, the lubrication state, the structural form of the engine, the operating conditions, and the quality of fuel and lubricating oil are the main factors. Of course, in the same cylinder, the influence of the lubrication state on the wear of the piston ring is correct. The ideal lubrication between the two sliding surfaces is that there is a uniform oil film between the two sliding surfaces. However, this situation does not exist in fact, especially for the air ring, due to the influence of high temperature, it is difficult to establish a more ideal lubrication state.

How to reduce the wear of piston rings

There are many factors that affect piston ring wear, and these factors are often intertwined. In addition, the type of engine and the use conditions are different, and the wear of the piston ring is also very different. Therefore, the problem cannot be solved by improving the structure and material of the piston ring itself. It can mainly start from the following aspects: piston ring and cylinder liner Material and good matching; surface treatment; structural state; selection of lubricating oil and additives; deformation of cylinder liner and piston due to heat during assembly and operation.

Piston ring wear can be divided into normal wear, scratches and abrasions, but these wear phenomena will not occur alone, and will occur at the same time, and will affect at the same time. Generally speaking, the sliding surface wear is larger than the upper and lower end wear surfaces. The sliding surface is mainly the wear of abrasives, while the upper and lower end wear is caused by repeated movement. However, if the piston is abnormal, it may deform and wear.

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