EP1664491A1 - Entrainement de soupapes - Google Patents

Entrainement de soupapes

Info

Publication number
EP1664491A1
EP1664491A1 EP04741147A EP04741147A EP1664491A1 EP 1664491 A1 EP1664491 A1 EP 1664491A1 EP 04741147 A EP04741147 A EP 04741147A EP 04741147 A EP04741147 A EP 04741147A EP 1664491 A1 EP1664491 A1 EP 1664491A1
Authority
EP
European Patent Office
Prior art keywords
rocker arm
valve
steel
valve train
train according
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.)
Granted
Application number
EP04741147A
Other languages
German (de)
English (en)
Other versions
EP1664491B1 (fr
Inventor
Günter EISENHARDT
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.)
IHO Holding GmbH and Co KG
Original Assignee
INA Schaeffler KG
Schaeffler KG
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 INA Schaeffler KG, Schaeffler KG filed Critical INA Schaeffler KG
Publication of EP1664491A1 publication Critical patent/EP1664491A1/fr
Application granted granted Critical
Publication of EP1664491B1 publication Critical patent/EP1664491B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F01L1/2405—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the cylinder head 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
    • 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
    • F01L1/182—Centre pivot rocking arms the rocking arm being pivoted about an individual fulcrum, i.e. not about a common shaft
    • F01L1/183—Centre pivot rocking arms the rocking arm being pivoted about an individual fulcrum, i.e. not about a common shaft of the boat 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
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L2001/187—Clips, e.g. for retaining rocker arm on pivot
    • 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
    • F01L2001/188—Fulcrums at upper surface
    • 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
    • F01L2301/00—Using particular materials
    • 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
    • F01L2305/00—Valve arrangements comprising rollers

Definitions

  • the invention relates to a valve train for four-stroke engines, in particular according to the preamble of patent claim 1.
  • rocker arms for actuating the valves, which are mounted on a common rocker arm shaft. Because of the different position of the valves, different rocker arms are required.
  • hydraulic play compensation elements arranged on the valve-side end of the rocker arm increase its polar moment of inertia.
  • reinforced valve springs are required, which result in a strengthening and possibly hardening of the rocker arm shaft.
  • Hydro elements for valve clearance compensation which have an outer piston open on one side with a support ball formed integrally at its closed end and an inner piston open on one side, which is guided in the outer piston and is in flow connection with a high-pressure chamber of the same via a spring-loaded ball valve;
  • a pressure oil line which is arranged in the longitudinal extension of the rocker arm frame at the level of the open end of the hydraulic elements
  • the invention is therefore based on the object of creating a valve train for four-stroke engines with preferably four valves per cylinder, which is characterized by cost-effective production and assembly.
  • the steel disc located at the bottom of the blind hole serves, among other things, as a stop for the inner piston of the hydraulic element and thus prevents possible wear of the rocker arm frame there.
  • the diameter of the steel discs preferably corresponds to that of the blind holes and that the pressure oil line is designed as a pressure oil bore, the center line of which preferably affects the circumference of the center plane of the steel discs of the offset hydraulic elements.
  • valves are rotated around the cylinder axis. This allows the swirl channels to be positioned better.
  • This valve position results in an offset of the adjacent steel sheet rocker arms and their hydraulic elements. Due to the position of the pressure oil bore according to the invention, the steel disks of the offset hydraulic elements are evenly loaded with pressure oil on their near-ground and far-away sides strikes and thus ensures their function.
  • applications are also conceivable in which a higher or a lower position of the pressure oil bore is advantageous.
  • suitable grooves are preferably arranged radially on the top and bottom of the steel disks, which cause the pressure oil bore to be connected to ventilation bores and to interior spaces of the inner pistons.
  • the air of the pressure oil that accumulates in the upper region of the pressure oil bore is discharged through the grooves arranged on the upper side of the disks with a low oil leakage flow to the vent holes preferably arranged in the center line of the hydraulic elements in the rocker arm frame.
  • the low-air pressure oil from the lower area of the pressure oil bores reaches the interior of the inner piston via the grooves on the underside of the steel discs, from where it flows into a high-pressure chamber of the outer piston via a spring-loaded ball valve when the valve clearance is compensated.
  • the outside of the inner pistons has a first circumferential groove in the area of overlap with the inside of the outer pistons, which is connected to the interior of the inner pistons via a radial bore. In this way, the low-air leakage oil from the high-pressure chamber of the outer pistons is collected in the circumferential groove of the inner pistons and returned to the interior of the inner pistons via the radial bore.
  • a second circumferential groove with a snap ring is arranged on the outer circumference of the outer bulb in the region of the open end thereof, which snap-in ring engages in a third circumferential groove in the end region of the blind holes.
  • the cross section of the deep-drawn sheet steel rocker arm is designed as an upwardly open U-shaped profile with a profile base into which the spherical cap is stamped and that the sheet steel rocker arm on the outside of the profile base is a contact element for the valve stems at the valve-side end a cylindrical shape with minimal transverse crowning is provided, the center line of which is parallel to the tilt axis of the sheet steel rocker arm.
  • the largest part of the hydraulic element can be accommodated in the open U-profile of the sheet steel rocker arm.
  • the cylindrical reshaping with the minimum transverse crowning and the guide rails are molded into the profile base without additional manufacturing and installation space.
  • construction height and construction costs are considerably saved.
  • a low polar moment of inertia of the sheet steel rocker arm is achieved about its tilt axis and simple lateral guidance of the same is achieved by the guide rails guided on the valve stems.
  • An alternative to the guide rails is extended side walls that are bent down and back and welded to the profile floor.
  • FIG. 1 shows a partial cross section AA of Figure 2 by a sheet steel rocker arm according to the invention, which is fixed to a rocker arm frame;
  • Figure 2 is a plan view of part of the rocker arm frame of Figure 1 with the sheet steel rocker arm attached thereto;
  • Figure 3 is a front view of the rocker arm frame with attached steel sheet rocker arms
  • Figure 4 is a partial view of the underside of the rocker arm frame with attached steel sheet rocker arms.
  • a longitudinal section A-A (see Figure 2) is shown by a sheet steel rocker arm 1, which is suspended from a rocker arm part 2.
  • the sheet steel rocker arm 1 is designed as a two-armed lever. It is driven by a camshaft (not shown) via a cylindrical, needle-bearing-mounted roller 3, is supported on the rocker arm frame 2 via a spherical cap 4 and a supporting ball 5 of a hydraulic element 6, and acts on the valve stems, which are also not shown, via a cylindrical shape 7 with minimal transverse crowning.
  • the hydraulic elements 6 serve to compensate for the valve clearance. They are guided in blind holes 8 in the light metal of the rocker arm frame 2.
  • the hydraulic elements 6 have a hollow cylindrical outer piston 9 made of steel, the closed end of which is integral with the seal. support ball 5 is formed.
  • a steel inner bulb 10 is guided with a sealing play, the open end of which is supported on a steel disk 11 at the bottom of the blind bore 8 and the closed end of which is in flow connection with a high-pressure chamber 13 of the outer bulb 9 via a spring-loaded ball valve 12 arranged there ,
  • the hydraulic elements 6 are supplied with pressure oil via a pressure oil bore 14 which extends in the longitudinal direction of the rocker arm frame 2 and whose center line affects the circumference of the center plane of the steel disks 11. Because of this position of the pressure oil bore 14, the near-ground and far-away sides 15, 16 of the steel disks 11 are supplied with pressure oil.
  • Fine radial grooves 29, not shown, are arranged on both sides 15, 16 of the steel disks 11.
  • the grooves 29 on the side 16 of the steel disk 11 remote from the ground serve to supply an interior 18 of the inner piston 10 with largely air-free pressure oil from the lower region of the pressure oil bore 14.
  • the outer piston 9 sucks from the interior 18 when the inlet and outlet valves are closed while the valve clearance compensation by the force of a pressure spring 19 arranged in the high-pressure chamber 13, pressure oil via the ball valve 12 into the high-pressure chamber 13. This pressure oil is under high pressure due to the actuating forces when the valve is opened and flows into the sealing gap between the outer and inner pistons 9, 10.
  • the outer bulb 9 has a second circumferential groove 22 on the outer circumference in the region of the open end, in which a snap ring 23 is located. This engages in a third groove 24, which is machined in the region of the bottom end of the blind hole 8 in this. This creates a partially positive connection between the rocker arm frame 2 and the hydraulic element 6, which prevents the rocker arm from falling out of the rocker arm frame 2 and thereby enables simple mounting of the valve train.
  • the height of the third groove 24 corresponds to the maximum adjustment path of the hydraulic element 6. It also serves to distribute the pressure oil over the circumference of the hydraulic elements 6 and the steel disks 11.
  • the sheet steel rocker arm 1 is designed as an upwardly open, deep-drawn U-profile with a profile base 25.
  • the cap 4 for the support ball 5 is stamped into the profile base 25 and is part of the same.
  • the inside of the dome 4 is designed as a so-called Gothic profile with several merging radii, which the support ball 5 offers a maximum contact area.
  • the center line of the cylindrical shape 27 is arranged parallel to the tilt axis of the sheet steel rocker arm 1.
  • the low transverse crowning of the cylindrical formations 27, in conjunction with the cylindrical rollers running on the camshaft and the calottes 4 which freely adjust around the support balls 5, offers a movement of the sheet steel rocker arm 1 about its longitudinal axis which compensates for all positional tolerances of the valve drive.
  • Two parallel guide rails 28 with a rectangular cross section and at a distance from the diameter of the valve stems and in the tilting direction of the sheet steel rocker arm 1 are integrally formed on the outside 26 of the profile base 25 in the region of the cylindrical formations 27 and their contour. This ensures simple and effective lateral guidance of the sheet steel rocker arm 1 via the valve stems.
  • the hydraulic elements 6 locked in the rocker arm frame 2 are captively connected to the steel sheet rocker arm 1 by retaining clips 30, which engage both in openings 31, 32 in the profile base 25 and in a fourth circumferential groove 33 at the transition from the support ball 5 to the outer piston 9. This results in an assembly-friendly unit of rocker arm frame 2 and steel sheet rocker arms 1.
  • the steel sheet rocker arms 1 are, as can be seen from all the figures, arranged offset according to the position of the valves but designed the same.
  • the camshafts, not shown, have a position with respect to the rollers 3 with half the lateral offset of the sheet steel rocker arms 1.
  • FIG. 2 shows a plan view of a part of the rocker arm frame 2 with attached steel sheet rocker arms 1 and the position information of the sectional plane A-A.
  • the first and second strips 34, 35 are connected in one piece by a first web 36.
  • the screw positions 27 of the screws for fastening the rocker arm frame 2 to the cylinder head and the ventilation bores 17 are also shown.
  • the length and lateral offset of the sheet steel rocker arms 1 are clearly recognizable.
  • FIG. 3 shows a front view of the rocker arm frame 2 with attached steel sheet rocker arms 1.
  • the closed pressure oil bores 14 can be seen.
  • FIG. 4 shows a partial view of the underside of the rocker arm frame 2 with attached steel sheet rocker arms 1.
  • the first and second webs 36, 37 and the screw positions 27 of the screws required for screwing onto the cylinder head are shown.
  • the bottom view of the sheet steel rocker arm 1 shows the cylindrical roller 3, the outside view of the spherical cap 4, which, like the cylindrical shape 7 and the guide rails 28, will be formed by plastic deformation of the profile base 25.
  • the retaining clips 30 are engaged, which are used on the top of the sheet steel rocker arm 1 to connect it to the hydraulic element 6, which in turn is connected to the rocker arm frame 2 by the snap ring 23.
  • the hydraulic elements 6 are captively connected by snap rings 23 to the rocker arm frame 2 and by retaining clips 30 to the steel plate rocker arms 1, which results in simple assembly of the pre-completed rocker arm frame 2;

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

L'invention concerne un entraînement de soupapes notamment destiné à des moteurs à quatre temps, composé d'un système de culbuteurs (2) comportant deux barres de guidage (34, 35) destinées à recevoir des culbuteurs; d'éléments hydrauliques (6); d'un élément en tôle d'acier disposé entre les éléments hydrauliques (6) et le système de culbuteurs (2); d'une conduite d'huile sous pression; et, de culbuteurs en tôle d'acier (1) emboutis, conçus de façon identique, présentant une section transversale en forme de U, comportant un rouleau cylindrique, une calotte (4) destinée à une boule support (5) de l'élément hydraulique, et des éléments de contact destinés aux tiges de soupapes des soupapes d'admission et d'échappement. Les coûts de fabrication des culbuteurs en tôle d'acier sont réduits selon l'invention du fait que les pistons extérieurs (9) des éléments hydrauliques (6) sont guidés dans des alésages borgnes (8) du système de culbuteurs (2), et qu'une plaque d'acier (11) est disposée au fond des alésages borgnes (8) en tant que butée pour le piston intérieur (10).
EP04741147A 2003-09-05 2004-07-20 Entrainement de soupapes Expired - Lifetime EP1664491B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10340944A DE10340944A1 (de) 2003-09-05 2003-09-05 Ventiltrieb
PCT/EP2004/008066 WO2005028816A1 (fr) 2003-09-05 2004-07-20 Entrainement de soupapes

Publications (2)

Publication Number Publication Date
EP1664491A1 true EP1664491A1 (fr) 2006-06-07
EP1664491B1 EP1664491B1 (fr) 2008-11-19

Family

ID=34352766

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04741147A Expired - Lifetime EP1664491B1 (fr) 2003-09-05 2004-07-20 Entrainement de soupapes

Country Status (4)

Country Link
US (1) US7261073B2 (fr)
EP (1) EP1664491B1 (fr)
DE (2) DE10340944A1 (fr)
WO (1) WO2005028816A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006002996A1 (de) * 2006-01-21 2007-08-02 Schaeffler Kg Kipphebel aus Stahlblech
EP1881166A1 (fr) * 2006-07-21 2008-01-23 Schaeffler KG Mécanisme d'actionnement de soupape commutable pour un moteur à combustion interne
EP1881165A3 (fr) * 2006-07-21 2009-12-16 Schaeffler KG Commande de soupape embrayable pour un moteur à combustion interne
DE102008010130A1 (de) 2007-03-22 2008-09-25 Schaeffler Kg Ventiltrieb für eine Brennkraftmaschine
US20110239967A1 (en) * 2010-03-30 2011-10-06 Gnutti Ltd. Valve bridge
DE102010054407A1 (de) 2010-12-14 2012-06-14 Schaeffler Technologies Gmbh & Co. Kg Ventiltriebsystem
DE102011005851A1 (de) 2011-03-21 2012-09-27 Schaeffler Technologies Gmbh & Co. Kg Ventiltriebsystem für eine Brennkraftmaschine
US9482120B2 (en) * 2013-03-25 2016-11-01 GT Technologies Retention device for valve actuating mechanism
US9863291B2 (en) 2015-05-14 2018-01-09 GT Technologies Locator for use in a valvetrain of a cylinder head of an internal combustion engine
US11339688B2 (en) 2020-01-29 2022-05-24 Borgwarner, Inc. Variable camshaft timing valve assembly

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4500169A (en) * 1982-07-13 1985-02-19 Donnelly John H Cosmetic and observer line of sight mirror
JPS60116809A (ja) * 1983-11-25 1985-06-24 Mazda Motor Corp エンジンの弁不作動装置
US4739734A (en) * 1985-07-19 1988-04-26 Honda Giken Kogyo Kabushiki Kaisha Valve train for internal combustion engine
US4682575A (en) * 1986-03-31 1987-07-28 Ford Motor Company Low friction high speed rocker arm
JPS62294708A (ja) * 1986-06-14 1987-12-22 Honda Motor Co Ltd 密封型ラツシユアジヤスタ
DE3743854A1 (de) * 1987-12-23 1989-07-06 Michael Stirm Vierventilsteuerung mit oberen abstuetzelementen
US4913104A (en) * 1988-11-30 1990-04-03 Henley Manufacturing Corporation Rocker arm for operating two valves
IT1302601B1 (it) * 1998-10-05 2000-09-29 Eaton Automotive Spa Bilanciere dotato di elemento idraulico nel fulcro per un treno dicomando di valvole.
DE19932348B4 (de) * 1999-07-10 2008-01-31 Dr.Ing.H.C. F. Porsche Ag Ventilspielausgleich für Brennkraftmaschinen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005028816A1 *

Also Published As

Publication number Publication date
WO2005028816A1 (fr) 2005-03-31
DE10340944A1 (de) 2005-04-28
US20070012272A1 (en) 2007-01-18
US7261073B2 (en) 2007-08-28
EP1664491B1 (fr) 2008-11-19
DE502004008497D1 (de) 2009-01-02

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