US20160146074A1 - Engine brake lash adjuster device and method - Google Patents

Engine brake lash adjuster device and method Download PDF

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Publication number
US20160146074A1
US20160146074A1 US14/898,026 US201414898026A US2016146074A1 US 20160146074 A1 US20160146074 A1 US 20160146074A1 US 201414898026 A US201414898026 A US 201414898026A US 2016146074 A1 US2016146074 A1 US 2016146074A1
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United States
Prior art keywords
rocker arm
engine
lash
valve
cylinder
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
US14/898,026
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English (en)
Inventor
Bradford Lynch
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Cummins Inc
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Cummins Inc
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Filing date
Publication date
Application filed by Cummins Inc filed Critical Cummins Inc
Priority to US14/898,026 priority Critical patent/US20160146074A1/en
Assigned to CUMMINS INC. reassignment CUMMINS INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LYNCH, Bradford
Publication of US20160146074A1 publication Critical patent/US20160146074A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/06—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for braking
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/181—Centre pivot rocking arms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/20—Adjusting or compensating clearance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/06—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for braking
    • F01L13/065—Compression release engine retarders of the "Jacobs Manufacturing" type
    • F01L9/04—
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
    • F01L2009/0403—
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
    • F01L9/21—Valve-gear or valve arrangements actuated non-mechanically by electric means actuated by solenoids
    • F01L2009/2103—Valve-gear or valve arrangements actuated non-mechanically by electric means actuated by solenoids comprising one coil

Definitions

  • This disclosure relates to an exhaust valve actuation mechanism in an internal combustion engine and an engine brake lash adjuster device associated with the exhaust valve actuation mechanism.
  • Engine brakes or engine compression brakes take advantage of the compression and expansion of gases in an engine cylinder to induce a resistance to movement of a piston in the engine cylinder by opening and closing valves associated with the piston at appropriate times.
  • conventional systems use various unique components and require certain precise tolerances.
  • FIG. 1 is a view of an engine brake lash adjuster device in accordance with an exemplary embodiment of the present disclosure.
  • FIG. 2 is a view of the engine brake lash adjuster device of FIG. 1 in a position to actuate an exhaust valve.
  • FIG. 3 is a view of the engine brake lash adjuster device of FIG. 1 with a compression brake actuated.
  • a compression brake includes a rocker arm pivotable about a rocker arm shaft to selectively force an exhaust valve to an open condition.
  • the rocker arm has a lower position, an upper position, and a plurality of positions intermediate the lower and upper positions.
  • the brake further includes a lash member coupled to the rocker arm.
  • the lash member is configurable to define a plurality of positions relative to the rocker arm.
  • the lash member has a first position that forces opening of the valve when the rocker arm is at the lower position.
  • the brake also includes a lost motion cylinder at least partially defined within the rocker arm. The cylinder is biased towards a position of greatest internal displacement volume.
  • the lost motion cylinder has a first operational mode wherein the lost motion cylinder permits compression thereof such that the ability of the rocker arm to open an exhaust valve is a function of the position of the lash member.
  • the lost motion cylinder has a second operational mode wherein the lost motion cylinder retards compression thereof such that the ability of the rocker arm to open an exhaust valve is independent of the position of the lash member.
  • a compression brake mechanism including: a rocker arm operable to selectively engage an engine valve; a lash member having a plurality of settings that define lash between rocker arm movement and engine valve movement; and a lost motion mechanism disposed between the lash member and the engine valve; the lost motion mechanism having a first operational mode and a second operational mode, the first operational mode providing an ability to open an engine valve as a function of the lash member setting, the second operational mode providing an ability to open an engine valve independent of the lash member setting.
  • a method of operating an exhaust valve on an internal combustion engine including: providing a lost motion cylinder at least partially within a rocker arm operable to open the exhaust valve; providing a lash member to define a maximum travel of a piston of the cylinder that defines a first internal volume of the cylinder; providing a seal valve within the rocker arm to selectively seal and open the internal volume of the cylinder; closing the seal valve when the internal volume of the cylinder is a second internal volume that is greater than a the first volume defined by the lash member thereby sealing fluid within the cylinder; rotating the rocker arm with the seal valve closed to force open the exhaust valve; and opening the seal valve to release fluid from the cylinder; and rotating the rocker arm with the seal valve open such that the cylinder assumes the first internal volume to force open the exhaust valve.
  • a method of adjusting lash between an exhaust valve and a rocker arm on an operating internal combustion engine including: providing a rocker arm having a first lash member defining a first lash amount between the rocker arm and the exhaust valve, the first lash amount defining a first point during downward travel of the rocker arm at which the exhaust valve is opened; providing a lash variance member defining a second lash amount between the rocker arm and the exhaust valve that is smaller than the first lash amount, the second last amount defining a second point in the downward travel of the rocker arm at which the exhaust valve is opened, the second point being higher than the first point; and toggling between the first and second lash amounts within a cycle of the engine.
  • Engine 10 includes an engine brake or engine compression brake, which provides the ability to retard movement of a crankshaft (note shown) of engine 10 when actuated.
  • Engine compression brakes provide a valuable capability in a variety of situations where a friction brake, such as might be found in conjunction with a vehicle wheel, could easily overheat or rapidly wear out. Such situations include high loads and steep hills. While engine compression brakes provide a valuable capability, they are expensive and complex, requiring additional components and precise component tolerances.
  • the engine brake of the present disclosure includes an exhaust valve actuation mechanism with a lash adjuster device or mechanism that provides the ability to reduce the number of components associated with an engine compression brake and the ability to reduce the tolerances of certain components associated with the engine compression brake disclosed in U.S. Pat. No. 6,253,730, the entire contents of which are hereby incorporated by reference.
  • Engine 10 includes a rocker arm assembly 12 having a rocker arm body 14 , an exhaust valve 16 moved by the action of rocker arm assembly 12 , a control shaft 18 that extends through rocker arm body 14 , a rotatable camshaft 20 , and an engine body 22 .
  • the function of rocker arm assembly 12 is to control or actuate exhaust valve 16 .
  • rocker arm assembly 12 is part of an exhaust valve actuation mechanism.
  • Rocker arm assembly 12 includes a reset valve 24 , a lash adjuster device 26 , a compression brake or engine brake hydraulic cylinder or piston 28 , and a bearing 30 .
  • Reset valve 24 includes a reset pin 32 , a detent pin 34 , and a reset member or ball 36 , each of which is positioned at least partially within a reset valve cavity 38 formed in rocker arm body 14 .
  • Reset valve cavity 38 includes a reset valve seat 86 that provides a mating surface for reset ball 36 when reset valve 24 is actuated.
  • Reset valve 24 may also include a bias spring 40 and a bias spring cup 42 positioned between bias spring 40 and reset ball 36 . Bias spring 40 and bias spring cup 42 bias reset ball 36 toward a proximate end of reset in 32 , contacting reset pin 32 during normal or non-compression braking operation of engine 10 .
  • Reset valve 24 functions to cause the opening and closing of exhaust valve 16 at a time that is independent of the position of lash adjuster device 26 , explained further hereinbelow.
  • Lash adjuster device 26 includes a distal end 84 and a threaded exterior surface 74 .
  • Engine brake piston 28 is positioned in a body cavity 44 formed in rocker arm body 14 and having a body cavity longitudinal axis 46 .
  • Engine brake piston 28 includes a portion 48 having a spherical shape on which is positioned a piston shoe 50 having a mating spherical shape and a shoe contact surface 52 , which contacts a proximate end 54 of exhaust valve 16 .
  • Shoe contact surface 52 may be a planar surface and proximate end 54 mates with the planar surface of shoe contact surface 52 .
  • Engine brake piston 28 includes an interior surface 56 that forms a piston cavity 58 .
  • Interior surface 56 includes an interior distal surface 70 that extends in a direction that is at an angle to body cavity longitudinal axis 46 that may be 90 degrees.
  • a piston bias spring 80 is positioned between rocker arm body 14 and interior distal surface 70 and functions to bias engine brake piston 28 toward piston shoe 50 and thus biases piston shoe 50 into contact with exhaust valve 16 , which is biased into the position shown in FIG. 1 by an exhaust valve spring (not shown).
  • Lash adjuster device 26 extends along body cavity longitudinal axis 46 through a threaded passage 60 formed in rocker arm body 14 into body cavity 44 and then into piston cavity 58 . Lash adjuster device 26 is adjustable along body cavity longitudinal axis 46 and is secured in position with a jam nut or locking nut 62 .
  • lash adjuster device 28 functions to actuate exhaust valve 16 during normal operation of engine 10 .
  • Bearing 30 is positioned on rocker arm body 14 and contacts camshaft 20 . During operation of engine 10 , camshaft 20 rotates, causing pivotal oscillating motion of rocker arm assembly 12 about control shaft 18 .
  • Control shaft 18 includes a control shaft oil passage 64 , which connects with a first rocker arm oil passage 66 formed in rocker arm body 14 that fluidly connects to reset valve cavity 38 .
  • Rocker arm body 14 further includes a second rocker arm oil passage 68 that extends between reset valve cavity 38 and body cavity 44 , fluidly connecting reset valve cavity 38 to body cavity 44 .
  • An engine oil pump (not shown) that provides oil pressure for various engine functions, such as lubrication, also provides pressure to the oil that flows into control shaft oil passage 64 , which then flows into first rocker arm body oil passage 66 .
  • control shaft oil passage 64 and first rocker arm body oil passage 66 provides lubrication to the various components fluidly connected to control shaft oil passage 64 and rocker arm body oil passage 66 .
  • These passages provide a control function to certain components of rocker arm assembly during engine compression braking, described further hereinbelow.
  • lash adjuster device 26 The longitudinal position of lash adjuster device 26 is set daring assembly of engine 10 , and because of the ability to identify the distance exhaust valve 16 needs to open empirically, setting the lash is easily accomplished through an automated process.
  • rocker arm assembly 12 With rocker arm assembly 12 in the position shown in FIG. 1 , and with jam nut 62 in a position to permit movement of lash adjuster device 26 , lash adjuster device 26 is driven or moved longitudinally downward toward interior distal surface 70 of engine brake piston 28 .
  • the drive torque to move lash adjuster device 26 increases non-linearly, which indicates that lash adjuster device 26 has contacted interior distal surface 70 of engine brake piston 28 .
  • lash adjuster device 26 is moved longitudinally away from interior distal surface 70 of engine brake piston 28 by a predetermined amount. Once movement of lash adjuster device 26 by the predetermined amount has been accomplished, jam nut 62 is secured against a jam nut contact surface 72 of rocker arm body 14 to lock lash adjuster device 26 in a fixed position.
  • lash adjuster device 26 includes exterior threaded surface 74 that mates with a similar thread formed in threaded passage 60 of rocker arm body 14 , and longitudinal movement of lash adjuster device 26 is accomplished by rotating lash adjuster device 26 about body cavity longitudinal axis 46 , which moves lash adjuster device 26 longitudinally along body cavity longitudinal axis 46 .
  • the ability to set the position of lash adjuster device 26 which determines when exhaust valve 16 is actuated, reduces the tolerances that would otherwise be required in the fabrication of rocker arm body 14 .
  • Camshaft 20 includes a cam profile 76 that causes oscillating pivotal motion of rocker arm assembly 12 about control shaft 18 .
  • cam profile 76 of camshaft 20 is shown as having only one lift event per revolution of camshaft 20 . It should be understood that camshaft 20 can have any number of lift events to achieve various performance conditions, which includes control of exhaust emissions.
  • Reset pin 32 includes a recess, undercut, or engaging feature 78 , that is engaged by detent pin 34 during normal operation of engine 10 .
  • detent pin 34 The position of detent pin 34 is maintained by a bias spring mechanism (not shown), until a solenoid or other actuation mechanism (not shown) moves detent pin 34 to a position where detent pin 34 disengages from reset pin 32 , which permits reset pin 32 to move toward a contact pad 80 formed on engine body 22 , as shown in FIG. 3 , which permits reset valve 24 to close, described further hereinbelow.
  • rocker arm assembly 12 rotates in a counterclockwise direction through contact of bearing 30 with cam profile 76 , as shown in FIG. 2 , engine brake piston 28 compresses piston bias spring 82 until interior distal surface 72 of engine brake piston 28 contacts lash adjuster device 26 .
  • This actuation of exhaust valve 16 is sometimes called lost motion. Further counterclockwise motion of rocker arm assembly 12 moves exhaust valve 16 , causing exhaust valve 16 to open, which permits exhaust gases to escape from engine body 22 in a known manner.
  • Cam profile 76 of camshaft 20 is configured to provide for rapid movement of lash adjuster device 26 toward interior distal surface 70 of engine brake piston 28 until distal end 84 of lash adjuster device 26 approaches interior distal surface 70 of engine brake piston 28 , at which point cam profile 76 provides a decreased velocity of lash adjuster device 26 to minimize the impact of lash adjuster device 26 with interior distal surface 70 of engine brake piston 28 . By reducing the impact, the life and reliability of lash adjuster device 26 and engine brake piston 28 are extended.
  • detent pin 34 When the engine brake function is engaged, as shown in FIG. 3 , detent pin 34 is moved to disengage from engaging feature 78 , permitting reset pin 32 to move longitudinally toward contact pad 80 of engine body 22 . Oil pressure present in rocker arm oil passage 66 and reset valve cavity 38 forces reset pin 32 longitudinally toward contact pad 80 , which permits reset valve ball 36 to move toward and contact reset valve seat 86 by the action of bias spring 40 , trapping oil in second rocker arm oil passage 68 and in body cavity 44 .
  • engine brake piston 28 With oil trapped in second rocker arm oil passage 68 and body cavity 44 , engine brake piston 28 is unable to move as rocker arm assembly 12 moves in a counterclockwise direction, because engine brake piston 28 is unable to compress the trapped oil, and thus movement of rocker arm assembly 12 causes engine brake piston 28 to move exhaust valve 16 sooner than would otherwise happen by contact of lash adjuster device 26 with interior distal surface 70 of engine brake piston 28 .
  • detent pin 34 is moved along its axis to engage with recess 78 reset pin 32 as reset pin 32 moves toward reset ball 36 through contact with contact pad 80 .
  • lash adjuster device 26 in combination with reset valve 24 permits the ability o combine functions in rocker arm assembly 12 to provide movement of exhaust valve 16 during operation of engine 10 as well as a different timing of the motion of exhaust valve 16 during engine braking events.
  • cost and complexity of engine 10 is reduced significantly while providing an engine compression brake for engine 10 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
US14/898,026 2013-07-29 2014-06-26 Engine brake lash adjuster device and method Abandoned US20160146074A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US14/898,026 US20160146074A1 (en) 2013-07-29 2014-06-26 Engine brake lash adjuster device and method

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US201361859598P 2013-07-29 2013-07-29
US14/898,026 US20160146074A1 (en) 2013-07-29 2014-06-26 Engine brake lash adjuster device and method
PCT/US2014/044347 WO2015017057A1 (fr) 2013-07-29 2014-06-26 Procédé et dispositif de rattrappeur de jeu de frein moteur

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CN (1) CN105683515A (fr)
DE (1) DE112014003482T5 (fr)
WO (1) WO2015017057A1 (fr)

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US20170175597A1 (en) * 2014-02-14 2017-06-22 Eaton Srl Rocker arm assembly for engine braking
US10132206B1 (en) 2017-05-19 2018-11-20 Caterpillar Inc. Common rocker arm for hydraulic lash adjuster and non-hydraulic lash adjuster
US10823018B1 (en) 2019-06-25 2020-11-03 Schaeffler Technologies AG & Co. KG Valve train arrangement including engine brake system and lost-motion hydraulic lash adjuster
CN111902615A (zh) * 2018-03-26 2020-11-06 雅各布斯车辆系统公司 使用次进气气门运动和空转复位的用于iegr的系统和方法
US11022008B2 (en) * 2017-08-24 2021-06-01 Eaton Intelligent Power Limited Ball engine brake mechanism
US11060427B2 (en) 2019-06-24 2021-07-13 Schaeffler Technologies AG & Co. KG Valve train including engine braking system
KR20210099655A (ko) * 2019-01-15 2021-08-12 자콥스 비히클 시스템즈, 인코포레이티드. 선택적 리셋팅 로스트 모션 엔진 밸브 트레인 구성요소
US11401839B2 (en) * 2018-07-13 2022-08-02 Eaton Intelligent Power Limited Rocker based bleeder engine brake
CN115324681A (zh) * 2022-09-02 2022-11-11 一汽解放汽车有限公司 一种气门驱动摇臂
US11549404B2 (en) 2017-08-24 2023-01-10 Eaton Intelligent Power Limited Ball engine decompression mechanism

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BR112017024460A2 (pt) 2015-05-18 2018-07-24 Eaton Srl conjunto de balancim de válvula de exaustão
US10240490B2 (en) 2016-05-07 2019-03-26 Eaton Intelligent Power Limited Oil control for rocker arm and hydraulic lash adjuster
DE102017009535A1 (de) * 2017-10-13 2019-04-18 Daimler Ag Ventiltrieb für eine Brennkraftmaschine eines Kraftfahrzeugs
CN110566308B (zh) * 2019-09-03 2020-08-25 浙江大学 一种用于发动机制动的重置滑阀式摇臂机构及其制动方法
CN112065525B (zh) * 2020-09-09 2021-11-19 潍柴动力股份有限公司 一种摇臂机构及发动机总成
CN113356955A (zh) * 2021-06-18 2021-09-07 广西玉柴机器股份有限公司 专用制动摇臂的制动间隙调整方法
CN114109551B (zh) * 2022-01-25 2022-04-26 江苏卓联精密机械有限公司 液压间隙自调专用驱动凸轮组合式气门驱动装置

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US8726863B2 (en) * 2007-03-16 2014-05-20 Jacobs Vehicle Systems, Inc. Rocker shaft pedestal incorporating an engine valve actuation system or engine brake
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Cited By (18)

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Publication number Priority date Publication date Assignee Title
US11015493B2 (en) 2014-02-14 2021-05-25 Eaton Intelligent Power Limited Rocker arm assembly for engine braking
US10247064B2 (en) * 2014-02-14 2019-04-02 Eaton Intelligent Power Limited Rocker arm assembly for engine braking
US20190178118A1 (en) * 2014-02-14 2019-06-13 Eaton Intelligent Power Limited Rocker arm assembly for engine braking
US10612435B2 (en) * 2014-02-14 2020-04-07 Eaton Intelligent Power Limited Rocker arm assembly for engine braking
US20170175597A1 (en) * 2014-02-14 2017-06-22 Eaton Srl Rocker arm assembly for engine braking
US10132206B1 (en) 2017-05-19 2018-11-20 Caterpillar Inc. Common rocker arm for hydraulic lash adjuster and non-hydraulic lash adjuster
US11022008B2 (en) * 2017-08-24 2021-06-01 Eaton Intelligent Power Limited Ball engine brake mechanism
US11549404B2 (en) 2017-08-24 2023-01-10 Eaton Intelligent Power Limited Ball engine decompression mechanism
CN111902615A (zh) * 2018-03-26 2020-11-06 雅各布斯车辆系统公司 使用次进气气门运动和空转复位的用于iegr的系统和方法
US11149599B2 (en) * 2018-03-26 2021-10-19 Jacobs Vehicle Systems, Inc. Systems and methods for IEGR using secondary intake valve motion and lost-motion reset
US11401839B2 (en) * 2018-07-13 2022-08-02 Eaton Intelligent Power Limited Rocker based bleeder engine brake
KR20210099655A (ko) * 2019-01-15 2021-08-12 자콥스 비히클 시스템즈, 인코포레이티드. 선택적 리셋팅 로스트 모션 엔진 밸브 트레인 구성요소
EP3911846A4 (fr) * 2019-01-15 2022-10-12 Jacobs Vehicle Systems, Inc. Réinitialisation sélective de composants de train de soupapes de moteur à mouvement perdu
KR102587249B1 (ko) * 2019-01-15 2023-10-11 자콥스 비히클 시스템즈, 인코포레이티드. 선택적 리셋팅 로스트 모션 엔진 밸브 트레인 구성요소
US11952923B2 (en) 2019-01-15 2024-04-09 Jacobs Vehicle Systems, Inc. Selective resetting lost motion engine valve train components
US11060427B2 (en) 2019-06-24 2021-07-13 Schaeffler Technologies AG & Co. KG Valve train including engine braking system
US10823018B1 (en) 2019-06-25 2020-11-03 Schaeffler Technologies AG & Co. KG Valve train arrangement including engine brake system and lost-motion hydraulic lash adjuster
CN115324681A (zh) * 2022-09-02 2022-11-11 一汽解放汽车有限公司 一种气门驱动摇臂

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