WO2015017057A1 - Procédé et dispositif de rattrappeur de jeu de frein moteur - Google Patents

Procédé et dispositif de rattrappeur de jeu de frein moteur Download PDF

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Publication number
WO2015017057A1
WO2015017057A1 PCT/US2014/044347 US2014044347W WO2015017057A1 WO 2015017057 A1 WO2015017057 A1 WO 2015017057A1 US 2014044347 W US2014044347 W US 2014044347W WO 2015017057 A1 WO2015017057 A1 WO 2015017057A1
Authority
WO
WIPO (PCT)
Prior art keywords
rocker arm
engine
lash
valve
cylinder
Prior art date
Application number
PCT/US2014/044347
Other languages
English (en)
Inventor
Bradford LYNCH
Original Assignee
Cummins Inc.
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 Cummins Inc. filed Critical Cummins Inc.
Priority to CN201480040400.3A priority Critical patent/CN105683515A/zh
Priority to DE112014003482.7T priority patent/DE112014003482T5/de
Priority to US14/898,026 priority patent/US20160146074A1/en
Publication of WO2015017057A1 publication Critical patent/WO2015017057A1/fr

Links

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
    • 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
    • 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. Patent 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
  • 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 bail 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 bail 36 toward a proximate end of reset pin 32, contacting reset pin 32 during normal or non-compression braking operation of engine 10, . Because this contact prevents reset ball 36 from contacting reset valve seat 86, fluid is able to flow past reset bali 36 toward engine brake piston 28, 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.
  • 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 thai 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. As described further hereinbelow, 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 during 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 n o -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 las 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.
  • camshaft 20 rotates, camshaft
  • Camshaft 20 contacts rocker assembly bearing 30.
  • 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, 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 tlms 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, To disengage the engine compression brake, detent pin 34 is moved along its axis to engage with recess 78 in reset pin 32 as
  • lash adjuster device 26 in combination with reset valve 24 permits the ability to 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)

Abstract

L'invention concerne un procédé et un dispositif de freinage par compression comprenant un élément de jeu couplé à un culbuteur. L'élément de jeu présente une première position qui force l'ouverture d'une soupape lorsque le culbuteur est en position basse. Le frein comprend un cylindre à mouvement libre au moins partiellement défini à l'intérieur du culbuteur. Le cylindre est sollicité vers une position de volume de déplacement interne maximum. Le volume de déplacement interne présente un premier mode fonctionnel autorisant sa compression de telle sorte l'aptitude du culbuteur à ouvrir une soupape d'échappement est une fonction de la position de l'élément de jeu. Le volume de déplacement interne présente un second mode fonctionnel lui permettant de retarder sa compression de telle sorte que l'aptitude du culbuteur à ouvrir la soupape d'échappement est indépendante de la position de l'élément de jeu.
PCT/US2014/044347 2013-07-29 2014-06-26 Procédé et dispositif de rattrappeur de jeu de frein moteur WO2015017057A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201480040400.3A CN105683515A (zh) 2013-07-29 2014-06-26 发动机制动间隙调节器装置及方法
DE112014003482.7T DE112014003482T5 (de) 2013-07-29 2014-06-26 Vorrichtung und Verfahren zur Einstellung des Spiels von Motorbremsen
US14/898,026 US20160146074A1 (en) 2013-07-29 2014-06-26 Engine brake lash adjuster device and method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201361859598P 2013-07-29 2013-07-29
US61/859,598 2013-07-29

Publications (1)

Publication Number Publication Date
WO2015017057A1 true WO2015017057A1 (fr) 2015-02-05

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PCT/US2014/044347 WO2015017057A1 (fr) 2013-07-29 2014-06-26 Procédé et dispositif de rattrappeur de jeu de frein moteur

Country Status (4)

Country Link
US (1) US20160146074A1 (fr)
CN (1) CN105683515A (fr)
DE (1) DE112014003482T5 (fr)
WO (1) WO2015017057A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3246539A1 (fr) * 2016-05-07 2017-11-22 Eaton Corporation Commande d'huile améliorée pour bras oscillant et rattrapeur de jeu hydraulique
US10526926B2 (en) 2015-05-18 2020-01-07 Eaton Srl Rocker arm having oil release valve that operates as an accumulator
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
US20240052762A1 (en) * 2022-01-25 2024-02-15 Jiangsu Jointek Precision Machinery Co., Ltd. Combined valve actuating devices with specialized actuating cams for hydraulic lash self-adjustment

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US10247064B2 (en) * 2014-02-14 2019-04-02 Eaton Intelligent Power Limited 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
CN111033003B (zh) * 2017-08-24 2022-04-05 伊顿智能动力有限公司 球形引擎制动机构
US11549404B2 (en) 2017-08-24 2023-01-10 Eaton Intelligent Power Limited Ball engine decompression mechanism
DE102017009535A1 (de) * 2017-10-13 2019-04-18 Daimler Ag Ventiltrieb für eine Brennkraftmaschine eines Kraftfahrzeugs
BR112020019360A2 (pt) * 2018-03-26 2020-12-29 Jacobs Vehicle Systems, Inc. Sistemas e métodos para iegr usando movimento de válvula de admissão secundário e rearme de movimento perdido
CN112673152B (zh) * 2018-07-13 2023-02-03 伊顿智能动力有限公司 基于摇臂的放气引擎制动
CN113286933B (zh) 2019-01-15 2023-05-23 雅各布斯车辆系统公司 选择性地复位空动发动机阀门机构组件
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
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
CN115324681B (zh) * 2022-09-02 2024-01-09 一汽解放汽车有限公司 一种气门驱动摇臂

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US6439195B1 (en) * 2000-07-30 2002-08-27 Detroit Diesel Corporation Valve train apparatus
US20030024501A1 (en) * 2001-06-13 2003-02-06 Mccarthy Donald J. Latched reset mechanism for engine brake
US20110023821A1 (en) * 2009-07-31 2011-02-03 Hyundai Motor Company Engine brake unit

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10526926B2 (en) 2015-05-18 2020-01-07 Eaton Srl Rocker arm having oil release valve that operates as an accumulator
EP3246539A1 (fr) * 2016-05-07 2017-11-22 Eaton Corporation Commande d'huile améliorée pour bras oscillant et rattrapeur de jeu hydraulique
CN107435567A (zh) * 2016-05-07 2017-12-05 伊顿公司 针对摇臂的改进的润滑油控制和液压间隙调节器
US10240490B2 (en) 2016-05-07 2019-03-26 Eaton Intelligent Power Limited Oil control for rocker arm and hydraulic lash adjuster
CN107435567B (zh) * 2016-05-07 2021-06-15 伊顿智能动力有限公司 针对摇臂的改进的润滑油控制和液压间隙调节器
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
US20240052762A1 (en) * 2022-01-25 2024-02-15 Jiangsu Jointek Precision Machinery Co., Ltd. Combined valve actuating devices with specialized actuating cams for hydraulic lash self-adjustment
US11988116B2 (en) * 2022-01-25 2024-05-21 Jiangsu Jointek Precision Machinery Co., Ltd. Combined valve actuating devices with specialized actuating cams for hydraulic lash self-adjustment

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DE112014003482T5 (de) 2016-04-07
US20160146074A1 (en) 2016-05-26
CN105683515A (zh) 2016-06-15

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