EP0910728B1 - Hydraulisches spielausgleichselement - Google Patents

Hydraulisches spielausgleichselement Download PDF

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Publication number
EP0910728B1
EP0910728B1 EP97923973A EP97923973A EP0910728B1 EP 0910728 B1 EP0910728 B1 EP 0910728B1 EP 97923973 A EP97923973 A EP 97923973A EP 97923973 A EP97923973 A EP 97923973A EP 0910728 B1 EP0910728 B1 EP 0910728B1
Authority
EP
European Patent Office
Prior art keywords
housing
pressure piston
region
valve
gas exchange
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.)
Expired - Lifetime
Application number
EP97923973A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0910728A1 (de
Inventor
Walter Speil
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.)
INA Waelzlager Schaeffler OHG
Original Assignee
INA Waelzlager Schaeffler OHG
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 Waelzlager Schaeffler OHG filed Critical INA Waelzlager Schaeffler OHG
Publication of EP0910728A1 publication Critical patent/EP0910728A1/de
Application granted granted Critical
Publication of EP0910728B1 publication Critical patent/EP0910728B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • F01L1/245—Hydraulic tappets
    • F01L1/25—Hydraulic tappets between cam and valve stem
    • 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
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/08—Shape of cams

Definitions

  • the invention relates to a valve train of an internal combustion engine according to the generic term Features of claim 1.
  • Game compensation element is known to the professional world from DE-OS 14 25 653. Its housing and pressure piston are also made of different materials Thermal expansion coefficient manufactured. It is a disadvantage of the known valve train with play compensation element that it is not in the Is able to quickly change the length of his gas exchange valve, for example compensated by high heat input after a cold start.
  • the object of the invention is therefore to provide a valve train with a hydraulic To create game compensation element of the aforementioned type, in which the the disadvantage cited is eliminated.
  • this object is characterized by the features of the Part of the main claim solved.
  • the measures according to the invention guarantee that too when the element is extremely heated, a required basic gap of at least 1 ⁇ m is guaranteed.
  • the quotient between a coefficient of thermal expansion of the pressure piston and the housing should advantageously between approximately 1, 2 and 2 move. This is an optimal area from this side proposed a material pairing at the leakage gap.
  • the pressure piston made of an austenitic steel or aluminum to manufacture surrounding housing from a ferritic steel.
  • the relatively "soft" Material aluminum for the pressure piston with a chemical or physically applied wear protection layer or the like his.
  • FIG. 1 shows a valve train with a hydraulic lash adjuster 1, which is installed in a conventional manner in a tappet 2 is.
  • the game compensation element 1 consists of a hollow cylindrical Housing 3, which is relatively movable in its bore 4, includes a pressure piston 5.
  • the pressure piston 5 is supported with his an end face 6 against a bottom 7 of the tappet 2.
  • the pressure piston 5 In the opposite Direction is the pressure piston 5 opposite a bottom 8 of the housing 3 supported by a spring means 9.
  • the pressure piston 5 towards the bottom 8 a check valve not to be described in detail 10, which opens towards the bottom 8.
  • Axial between pressure pistons 5 and floor 8 runs a high-pressure chamber 11 for hydraulic fluid.
  • the tappet 2 on its bottom 7 by a cam 12 in Lifting sense applied. A stroke of the cam 12 is transmitted thus, starting from this, via the tappet 2 onto a bottom 8 of the housing 3 facing end 20 of a gas exchange valve 13, such as an exhaust valve.
  • a gas exchange valve 13 such as an exhaust valve.
  • the spring means 9 ensures that the frictional connection between the tappet 2, the cam 12 and the gas exchange valve 13 remains free of play.
  • the above-mentioned change in length of the lash adjuster 1 by squeezing the hydraulic medium from the high-pressure chamber 11 is not only necessary to compensate for the valve lash, but also to compensate for dilatations in the valve train, such as those described in FIG. B. due to wear on the valve seat or thermal expansion, as detailed in the introduction, may occur.
  • the housing 3 consists of a material with a coefficient of thermal expansion, which is smaller than the thermal expansion coefficient of the material of the pressure piston 5.
  • materials for the pressure piston 5 are, for example, austenitic steel or aluminum and for the housing 3, a ferritic steel is proposed (see also description of FIG. 3).
  • B 1 denotes the immediate run-off edge
  • B 2 a connection area, which can be designed, for example, to be degressive
  • B 3 an intermediate area, which is advantageously linear (ie constant in speed)
  • B 4 an end area adjoining this intermediate area B 3 , which is proposed to be degressive
  • B 5 is the base circle area of the cam 12.
  • the areas B 2 - B 4 thus represent a closing ramp B 2 - 4.
  • the gas exchange valve 13 in question also sits in its seat (not shown) relatively "softly" across all temperature ranges.
  • this area relatively short, which has an advantageous effect on the control times, since the valve overlap area is shortened. It is also conceivable to design the entire closing ramp B 2 - 4 degressively.
  • a valve lift curve known per se can be seen in FIG.
  • the curve V HDYN corresponds to the course of the kinematic stroke curve V HKIN, but minus the compressibility or elasticity of the entire valve train and minus the stroke loss dependent on the respective operating state (temperature and speed) by lowering the play compensation element 1, caused by the pressing out of hydraulic fluid be seen from the high-pressure chamber 11 14 through the leakage gap is also that the closing ramp B 2-4 linear, ie rate constant, is designed. If the gas exchange valve 13 comes into its seat in this area, its soft and very wear-resistant and low-noise mounting can be expected.
  • FIG. 3 shows a diagram of a typical course of a change in play ⁇ S of an exhaust valve 13 in relation to its surroundings in the form of the curve plotted against the time t after a cold start of the internal combustion engine.
  • a rapid increase in length of the exhaust valve 13 compared to its surrounding parts can be determined immediately after starting the internal combustion engine from its cold state (gradient ⁇ ).
  • gradient ⁇ stands for the sinking paths of the pressure piston 5, which are digitally added up over the warm-up phase, relative to the housing 3.
  • the gradient ⁇ ' must be at least the same, but desirably steeper according to the invention than the gradient ⁇ . Only then is a complete closing of the gas exchange valve 13 to be expected during the heating phase of the internal combustion engine. This problem is solved by applying the measures according to the invention. Only when a constant operating temperature T 0 is reached at the gas exchange valve 13 can uniform thermal expansion of all the valve train and cylinder head parts 16, inter alia, be expected.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP97923973A 1996-07-11 1997-05-22 Hydraulisches spielausgleichselement Expired - Lifetime EP0910728B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19627982 1996-07-11
DE19627982A DE19627982A1 (de) 1996-07-11 1996-07-11 Hydraulisches Spielausgleichselement
PCT/EP1997/002611 WO1998002645A1 (de) 1996-07-11 1997-05-22 Hydraulisches spielausgleichselement

Publications (2)

Publication Number Publication Date
EP0910728A1 EP0910728A1 (de) 1999-04-28
EP0910728B1 true EP0910728B1 (de) 2000-07-19

Family

ID=7799568

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97923973A Expired - Lifetime EP0910728B1 (de) 1996-07-11 1997-05-22 Hydraulisches spielausgleichselement

Country Status (5)

Country Link
EP (1) EP0910728B1 (ja)
JP (1) JP2000514521A (ja)
BR (1) BR9710286A (ja)
DE (2) DE19627982A1 (ja)
WO (1) WO1998002645A1 (ja)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19856617A1 (de) * 1998-12-08 2000-06-21 Siemens Ag Element zur Übertragung einer Bewegung und Einspritzventil mit einem solchen Element
DE19858476B4 (de) * 1998-12-17 2006-07-27 Siemens Ag Vorrichtung zum Übertragen einer Aktorauslenkung auf ein Stellglied und Einspritzventil mit einer solchen Vorrichtung
DE102020213598A1 (de) 2020-10-29 2022-05-05 Volkswagen Aktiengesellschaft Antriebssystem mit Verbrennungsmotor und Einlassventilen mit hohen Aufsetzgeschwindigkeiten

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1425653A1 (de) * 1963-07-08 1969-01-23 Richard Kuechen Sen Ventilantrieb mit hydraulischem Spielausgleich
DE3102497C2 (de) * 1981-01-27 1983-02-03 Daimler-Benz Ag, 7000 Stuttgart "Ruckfreier Nockentrieb"
JPS5915614A (ja) * 1982-07-19 1984-01-26 Atsugi Motor Parts Co Ltd 内燃機関のバルブ機構におけるラツシユ調整装置
EP0281990A1 (de) * 1987-03-11 1988-09-14 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Hydraulisches Ausgleichselement
DE3724655A1 (de) * 1987-07-25 1988-08-04 Daimler Benz Ag Hydraulisches ventilspielausgleichselement

Also Published As

Publication number Publication date
BR9710286A (pt) 1999-08-17
DE19627982A1 (de) 1998-01-15
JP2000514521A (ja) 2000-10-31
DE59702065D1 (de) 2000-08-24
EP0910728A1 (de) 1999-04-28
WO1998002645A1 (de) 1998-01-22

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