EP3880941A1 - Mécanisme de frein moteur à assistance hydraulique pour dispositif de commande de soupapes - Google Patents

Mécanisme de frein moteur à assistance hydraulique pour dispositif de commande de soupapes

Info

Publication number
EP3880941A1
EP3880941A1 EP19806167.3A EP19806167A EP3880941A1 EP 3880941 A1 EP3880941 A1 EP 3880941A1 EP 19806167 A EP19806167 A EP 19806167A EP 3880941 A1 EP3880941 A1 EP 3880941A1
Authority
EP
European Patent Office
Prior art keywords
rocker arm
assembly
accumulator
exhaust valve
plunger
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.)
Withdrawn
Application number
EP19806167.3A
Other languages
German (de)
English (en)
Inventor
Pritam EDKE
Santosh Dadasaheb PACHPUND
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eaton Intelligent Power Ltd
Original Assignee
Eaton Intelligent Power 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 Eaton Intelligent Power Ltd filed Critical Eaton Intelligent Power Ltd
Publication of EP3880941A1 publication Critical patent/EP3880941A1/fr
Withdrawn legal-status Critical Current

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
    • 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
    • F01L1/2416—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device attached to an articulated rocker
    • 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
    • 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
    • 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
    • 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
    • F01L1/2411—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the valve stem and rocker arm
    • 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
    • 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
    • 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
    • F01L2001/2444—Details relating to the hydraulic feeding circuit, e.g. lifter oil manifold assembly [LOMA]
    • 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
    • F01L2013/10—Auxiliary actuators for variable valve timing
    • F01L2013/105—Hydraulic motors

Definitions

  • the present disclosure relates generally to engine braking and, more particularly, to hydraulic assisted engine braking.
  • Compression engine brakes can be used as auxiliary brakes, in addition to wheel brakes, on relatively large vehicles, for example trucks, powered by heavy or medium duty diesel engines.
  • a compression engine braking system is arranged, when activated, to provide an additional opening of an engine cylinder’s exhaust valve when the piston in that cylinder is near a top-dead-center position of its compression stroke so that compressed air can be released through the exhaust valve. This causes the engine to function as a power consuming air compressor, which slows the vehicle.
  • the exhaust valve is actuated by a rocker arm, which engages the exhaust valve by means of a valve bridge.
  • the rocker arm rocks in response to a cam on a rotating cam shaft and presses down on the valve bridge which itself presses down on the exhaust valve to open it.
  • a hydraulic lash adjuster may also be provided in the valve train assembly to remove any lash or gap that develops between the components in the valve train assembly.
  • An exhaust valve rocker arm assembly operable in a drive mode and an engine braking mode includes a rocker shaft, a rocker arm, a hydraulic lash adjuster assembly, an accumulator assembly and a locking pin.
  • the rocker shaft has an oil gallery defined thereon.
  • the rocker arm receives the rocker shaft and is configured to rotate around the rocker shaft.
  • the rocker arm has an oil feed channel that is fluidly connected to the oil gallery.
  • the rocker arm further defines an engine brake relief hold and an accumulator relief hole.
  • the hydraulic lash adjuster assembly is disposed on the rocker arm and has a plunger assembly including first and second plunger bodies. The first plunger body is movable between a first positon and a second position.
  • the accumulator assembly is disposed in the rocker arm and is fluidly coupled to the hydraulic lash adjuster through an engine brake relief hole.
  • the locking pin assembly is disposed in the rocker am and is selectively movable by a high pressure fluid from a closed position to an open position. In the open position, fluid flows from the accumulator relief hole causing the plunger assembly to be collapsible wherein the first plunger body is movable to the second position.
  • the accumulator assembly further comprises an accumulator piston and an accumulator biasing member.
  • the rocker arm can define an accumulator chamber that receives the accumulator assembly.
  • the lock pin assembly can comprise a lock pin and a lock pin biasing member.
  • the rocker arm defines a lock pin receiving body that receives the lock pin biasing member.
  • the plunger assembly is collapsible. During an exhaust lift, the plunger assembly compresses until the first plunger moves past a plunger engine brake relief hole in the first plunger and an engine brake relief hole in the rocker arm. In the brake mode, low pressure oil from the oil gallery is supplied through the rocker arm oil feed allowing the locking pin to move to a closed position and the accumulator relief hole to close. In the braking mode, the plunger assembly is rigid.
  • an angular position of the oil gallery on the rocker shaft is placed such that an oil supply on the rocker arm selectively locates with one of a high pressure oil source and a low pressure oil source.
  • the locking pin can move to the open position causing the accumulator assembly to become compressible and providing lost motion in the plunger assembly upon the oil supply on the rocker arm aligning with the high pressure oil source.
  • the locking pin can move to the closed position causing the accumulator assembly to become rigid upon the oil supply on the rocker arm aligning with the low pressure oil source.
  • FIG. 1A is a front perspective view of an engine braking rocker arm constructed in accordance to one example of the present disclosure
  • FIG. 1 B is a sectional view taken along line 1 B-1 B of FIG. 1A and showing a lock pin in a closed position thereby blocking an accumulator relief hole during an engine brake event;
  • FIG. 1 C is a sectional view taken along line 1C-1 C of FIG. 1A;
  • FIG. 1 D is a sectional view taken along line 1 D-1 D of FIG. 1 A;
  • FIG. 2A is a partial front perspective view of the engine braking rocker arm of FIG. 1A;
  • FIG. 2B is a sectional view taken along line 2B-2B of FIG. 2A;
  • FIG. 2C is a plot illustrating valve lift versus cam degrees for an exemplary engine braking event carried out by the engine braking rocker arm of FIG. 1A;
  • FIG. 3A is a sectional view taken along line 3A-3A of FIG. 2A and shown with the lock pin in an open position thereby opening the accumulator relief hole during drive mode;
  • FIG. 3B is a sectional view taken along line 3B-3B of FIG. 2A and shown with the lock pin in the open position;
  • FIG. 4A is a sectional view of the engine braking rocker arm of FIG. 1A and shown with the lock pin in a closed position;
  • FIG. 4B is a sectional view of the engine braking rocker arm of FIG. 1A and shown with the lock in in the closed position;
  • FIG. 5A is a sectional view of the engine braking rocker arm of FIG. 1 A shown with the locking pin just before reset;
  • FIG. 5B is a sectional view of the engine braking rocker arm of FIG. 5A just after reset;
  • FIG. 6A is a schematic view of an oil supply on the rocker arm aligned with a low pressure source on an oil gallery of a rocker shaft;
  • FIG. 6B is a schematic view of the oil supply on the rocker arm aligned with a high pressure source on the oil gallery of the rocker shaft.
  • an engine braking rocker arm assembly is shown and generally indicated at reference numeral 10.
  • the engine braking rocker arm assembly 10 provides an engine braking operation with the help of a hydraulic lash adjuster (HLA) 12, an accumulator assembly 16, and lock pin assembly 20.
  • the engine braking rocker arm assembly 10 also provides a reset function which makes the maximum lift the same as the drive mode.
  • Engine braking is typically utilized to effectively slow down a vehicle on a downhill grade by opening the exhaust valve during the compression stroke.
  • the function of an engine braking capsule is to absorb the lift from the cam in an engine braking off mode.
  • the engine braking rocker arm assembly 10 described herein is configured to achieve lift absorption using the HLA 12, the accumulator assembly 16 and the lock pin assembly 20 in connection with a hydraulic circuit 26.
  • the rocker arm assembly 10 generally includes a rocker arm 30 that defines a shaft receiving bore 32 and that is configured to receive and rotate around a rocker shaft 34 (FIG. 6A).
  • the rocker arm 30 further defines an accumulator chamber 38 that receives an accumulator piston 40 and accumulator biasing member 42 of the accumulator assembly 16.
  • the rocker arm 30 defines a relief hole 46 that is configured to drain oil from the accumulator chamber 38 depending upon a position of the lock pin assembly 20 as will become appreciated herein.
  • the rocker arm 30 defines an oil feed channel 48 the delivers high pressure oil to the lock pin assembly 20.
  • the rocker arm 30 defines a lock pin receiving body 50 that receives a lock pin 52 and lock pin biasing member 54 of the lock pin assembly 20.
  • the rocker arm 30 further defines an HLA receiving bore 58 (FIG. 1 C).
  • the HLA 12 generally includes a capsule or plunger assembly 60 including a first plunger body 62 and a second plunger body 64.
  • the second plunger body 64 can be partially received by the first plunger body 62.
  • the plunger assembly 60 is received by the HLA receiving bore 58.
  • the first plunger body 62 can have a closed end 68 that defines a spigot 70 which is received in a first socket 72 that ultimately acts against a valve stem.
  • a check ball assembly 80 can be positioned between the first and second plunger bodies 62 and 64.
  • the check ball assembly 80 can include a first biasing member 82, a cage 84, and a check ball 90.
  • a snap ring 92 nests in a radial groove provided in the bore 58 of the rocker arm 30. The snap ring 92 retains the first plunger body 62 in the bore 58.
  • the engine braking rocker arm assembly 10 is operable between a drive mode (FIGS. 3A, 3B) and an engine brake mode (FIGS. 4A and 4B).
  • a drive mode high pressure oil is supplied through the rocker arm oil feed 48 to the pin 52. This pushes the pin 52 backward and opens an oil path to the accumulator relief hole 46.
  • the engine brake capsule 60 is spongy and is able to absorb the BGR lift.
  • the capsule 60 is compressed until the second (internal) plunger 64 moves past a plunger engine brake relief hole 94 in the first plunger 62 and an engine brake relief hole 95 in the rocker arm 30. After the engine brake relief hole 94 is sealed, the entire cam lift is transferred.
  • low pressure oil is supplied through the rocker arm oil feed 48 from low pressure cavity 94 (FIG. 6A) on the rocker shaft 34 to the pin 52. This keeps the pin 52 in position and keeps the accumulator relief hole 46 closed.
  • the engine brake capsule 60 is rigid and transfers the BGR/CR lift.
  • the oil feed to the pin 52 can be positioned such that after the required rotation, the oil pin feed 48 connects to a high pressure cavity 96 (FIG. 6B) on the rocker shaft 34, thereby providing a reset function.
  • an oil gallery 100 is provided in the rocker shaft 34 connecting the main oil gallery (see FIGS. 6A and 6B).
  • the angular position of the oil gallery 100 on the rocker shaft 34 is placed such that it connects with an oil supply 110 on the rocker arm 30 at the instant when reset is required.
  • the high pressure oil opens the lock pin 52 making the accumulator assembly 16 soft (compressible) thereby providing the required lost motion in the capsule 60.
  • FIG. 5A shows the locking pin 52 before reset.
  • FIG. 5B shows the locking pin 52 after reset.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

L'invention concerne un ensemble culbuteur de soupape d'échappement pouvant fonctionner dans un mode d'entraînement et un mode de freinage de moteur, lequel ensemble comprend un axe de culbuteur, un culbuteur (30), un ensemble rattrapeur de jeu hydraulique (12), un ensemble accumulateur (16) et une broche de verrouillage (52). L'axe de culbuteur (34) a une galerie d'huile définie sur celui-ci. Le culbuteur (30) a un canal d'alimentation en huile qui est en communication fluidique avec la galerie d'huile. Le culbuteur (30) définit en outre une cale de relâchement de frein moteur et un trou de relâchement d'accumulateur (46). L'ensemble accumulateur (16) est disposé dans le culbuteur (30) et est couplé de manière fluidique au rattrapeur de jeu hydraulique par l'intermédiaire d'un trou de relâchement de frein moteur (94). L'ensemble broche de verrouillage (20) est disposé dans le culbuteur (30) et est déplaçable de façon sélective par un fluide à haute pression d'une position fermée à une position ouverte.
EP19806167.3A 2018-11-15 2019-11-15 Mécanisme de frein moteur à assistance hydraulique pour dispositif de commande de soupapes Withdrawn EP3880941A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN201811043088 2018-11-15
PCT/EP2019/081562 WO2020099669A1 (fr) 2018-11-15 2019-11-15 Mécanisme de frein moteur à assistance hydraulique pour dispositif de commande de soupapes

Publications (1)

Publication Number Publication Date
EP3880941A1 true EP3880941A1 (fr) 2021-09-22

Family

ID=68621269

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19806167.3A Withdrawn EP3880941A1 (fr) 2018-11-15 2019-11-15 Mécanisme de frein moteur à assistance hydraulique pour dispositif de commande de soupapes

Country Status (4)

Country Link
US (1) US20210270153A1 (fr)
EP (1) EP3880941A1 (fr)
CN (1) CN113167136A (fr)
WO (1) WO2020099669A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112253274B (zh) * 2020-09-11 2022-02-18 浙江九隆机械有限公司 一种制动摇臂

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5626116A (en) * 1995-11-28 1997-05-06 Cummins Engine Company, Inc. Dedicated rocker lever and cam assembly for a compression braking system
WO2001020151A1 (fr) * 1999-09-17 2001-03-22 Diesel Engine Retarders, Inc. Frein a culbuteur a perte de mouvement integre avec soupape de commande d'arret/remise en position a perte de mouvement
EP1242735B1 (fr) * 1999-12-20 2010-10-13 Jacobs Vehicle Systems, Inc. Procede et dispositif relatifs a une fermeture hydraulique et a un reenclenchement des systemes de freinage d'un moteur, par utilisation de la perte du mouvement
US6439195B1 (en) * 2000-07-30 2002-08-27 Detroit Diesel Corporation Valve train apparatus
CN202300563U (zh) * 2011-11-09 2012-07-04 中国第一汽车股份有限公司 集成式发动机制动用摇臂
EP3105427B1 (fr) * 2014-02-14 2019-05-29 Eaton Intelligent Power Limited Culbulteur pour frein moteur
EP3194734B1 (fr) * 2014-09-18 2020-08-12 Eaton Intelligent Power Limited Culbuteur pour frein moteur
CN104500164B (zh) * 2015-01-03 2017-01-11 浙江康和机械科技有限公司 一种集成式发动机制动摇臂结构
EP3298251B1 (fr) * 2015-05-18 2020-01-01 Eaton Intelligent Power Limited Culbuteur comprenant un clapet de décharge fonctionnant comme accumulateur
WO2017064690A1 (fr) * 2015-10-15 2017-04-20 Eaton S.R.L Ensemble culbuteur pour frein de moteur
ITUB20155428A1 (it) * 2015-11-10 2017-05-10 Streparava S P A Con Socio Unico Un dispositivo di controllo di una valvola di un motore a combustione interna per controllare la valvola di un motore a combustione interna

Also Published As

Publication number Publication date
WO2020099669A1 (fr) 2020-05-22
CN113167136A (zh) 2021-07-23
US20210270153A1 (en) 2021-09-02

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