EP0272423B1 - Sich selbsttätig hydraulisch einstellender Ventilstössel - Google Patents

Sich selbsttätig hydraulisch einstellender Ventilstössel Download PDF

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Publication number
EP0272423B1
EP0272423B1 EP87116363A EP87116363A EP0272423B1 EP 0272423 B1 EP0272423 B1 EP 0272423B1 EP 87116363 A EP87116363 A EP 87116363A EP 87116363 A EP87116363 A EP 87116363A EP 0272423 B1 EP0272423 B1 EP 0272423B1
Authority
EP
European Patent Office
Prior art keywords
hollow cylindrical
cylindrical wall
radial flange
bore
outer peripheral
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
EP87116363A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0272423A1 (de
Inventor
Georg Dr. Ing. E.H. Dipl.Kfm. Schaeffler
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 EP0272423A1 publication Critical patent/EP0272423A1/de
Application granted granted Critical
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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

Definitions

  • the invention relates to an automatically hydraulically adjusting valve tappet, which is arranged in a guide bore of a cylinder head of an internal combustion engine, and which consists of a cup-shaped housing which comprises a hollow cylindrical wall which is closed at one end by a bottom, against which one from the outside Control cam starts, a distance from the floor in the bore of the hollow cylindrical wall is provided as a separate component designed radial flange which receives the actual hydraulic play compensation element in a bore concentric with the hollow cylindrical wall.
  • the cup-shaped housing as a whole, including the radial flange is made from solid material by means of turning.
  • the machining is very expensive and leads to the fact that the cup-shaped housing has an undesirably large mass because of the large wall thicknesses.
  • the radial flange is designed as a separate component and is fastened in the bore in the hollow cylindrical wall.
  • special measures are required, namely, e.g. B. welding, soldering or the like, but this does not disclose the known embodiment.
  • Document EP-A-0 030 781 shows e.g. B. in Figure 8 a valve lifter, the play compensation element is not longitudinally displaceably guided in the bore of a radial flange, but in a special cylinder part which is made in one piece with the cup-shaped housing. This gives the plunger a complicated structure.
  • Figure 5 of document EP-A-0 179 323 shows a valve lifter with a thin-walled inner part, which consists of two cylinders and a connecting area located between them. This inner part is not supported radially on a cylindrical surface, so that an expansion of the inner part wall to the unsupported side is possible when heated.
  • the invention has for its object to produce a valve lifter of the type mentioned in a simple and inexpensive manner so that its play in the guide bore of the cylinder head remains almost constant in all temperature ranges.
  • the radial flange has an annular region which extends between the bore and the outer surface with a thickness which is substantially the same as the length of the circular cylindrical guide surface of the play compensation element, that the radial flange is further formed from a material , which has a higher coefficient of expansion than steel, in particular similar to that of aluminum, wherein it is inserted and fixed with its outer jacket surface in a liquid-tight manner by pressing into the bore of the hollow cylindrical wall, and that the wall thickness of the hollow cylindrical wall is at least in the longitudinal region in which the radial flange is arranged so thin-walled that the radial flange is able to expand the wall elastically to the outside during thermal expansion.
  • the radial flange which in particular comprises plastic and aluminum, makes it possible to dispense entirely with special fastening methods, namely welding, soldering, gluing or the like.
  • the fact that the radial flange has a higher coefficient of expansion than the hollow cylindrical wall ensures that even with the temperature differences occurring during operation, this interference fit never loosens, but rather becomes firmer.
  • the radial flange has a higher coefficient of expansion than the hollow cylindrical wall is also used for a further advantage.
  • engine cylinder heads made of light metal have been used more and more.
  • the disadvantageous phenomenon occurs that with increasing warming the cylinder head expands more than the valve lifter made of steel, which increases the play between the valve lifter on the one hand and its receiving bore on the other. This leads to an undesirably large oil throughput.
  • this disadvantage is circumvented or at least reduced by the fact that the radial flange elastically widens the wall outward when the thermal expansion occurs. Since the expansion coefficient of light metal on the one hand and suitable plastics, e.g. B. polyethersulfone are approximately the same, can be achieved so that the game of the valve lifter in its guide bore remains at least approximately constant in all temperature ranges.
  • the radial flange can be fixed, for example, in that it has a circumferential groove on its outer lateral surface, into which a projection of the hollow cylindrical wall engages in a form-fitting manner.
  • the projection of the hollow cylindrical wall can be formed in a simple manner by a circumferential bead which delimits an oil supply groove in the outer lateral surface of the hollow cylindrical wall.
  • an additional seal in particular in the form of an O-ring, can be provided between the bore of the hollow cylindrical wall on the one hand and the outer surface of the radial flange on the other.
  • the valve lifter shown in Figure 1 has a cup-shaped housing 1, which consists of the hollow cylindrical wall 2, which is closed at the upper end by the bottom 3. At a distance from the bottom 3, the radial flange 4 is provided in the bore of the hollow cylindrical wall, which receives the actual hydraulic play compensation element 6 in a longitudinally displaceable manner in a bore 5 concentric with the hollow cylindrical wall 2.
  • the radial flange 4 is made of a polymeric material.
  • the radial flange 4 is fixed in the bore of the hollow cylindrical wall 2 in such a way that the radial flange 4 has on its outer lateral surface 7 a circumferential groove 8 into which a projection 9, which is designed as a circumferential bead, engages.
  • This circumferential bead 9 simultaneously delimits an oil feed groove 10 in the outer lateral surface of the hollow cylindrical wall 2.
  • the radial flange 4 is introduced into the bore of the hollow cylindrical wall 2 in a simple manner by axially pressing it into the cup-shaped housing 1.
  • the actual hydraulic play compensation element 6 is guided directly in a bore of the radial flange made of polymer material.
  • the embodiment according to FIG. 2 differs from that described essentially only in that a metal bushing 11 is inserted into the bore of the radial flange 4, which is expedient if a plastic is used for the radial flange 4 which does not have sufficient dimensional stability and / or has unfavorable abrasion properties.
  • an additional seal in the form of an O-ring 12 is also provided between the bore of the hollow cylindrical wall 2 on the one hand and the outer lateral surface 7 of the radial flange 4. Such an additional seal is only required in cases in which the polymeric material of the radial flange 4 does not have sufficient elasticity.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP87116363A 1986-11-22 1987-11-06 Sich selbsttätig hydraulisch einstellender Ventilstössel Expired - Lifetime EP0272423B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863639911 DE3639911A1 (de) 1986-11-22 1986-11-22 Sich selbsttaetig hydraulisch einstellender ventilstoessel
DE3639911 1986-11-22

Publications (2)

Publication Number Publication Date
EP0272423A1 EP0272423A1 (de) 1988-06-29
EP0272423B1 true EP0272423B1 (de) 1991-04-10

Family

ID=6314530

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87116363A Expired - Lifetime EP0272423B1 (de) 1986-11-22 1987-11-06 Sich selbsttätig hydraulisch einstellender Ventilstössel

Country Status (6)

Country Link
US (1) US4787347A (ja)
EP (1) EP0272423B1 (ja)
JP (1) JPS63131807A (ja)
BR (1) BR8706265A (ja)
DE (2) DE3639911A1 (ja)
ES (1) ES2021326B3 (ja)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3812333A1 (de) * 1988-04-14 1989-10-26 Schaeffler Waelzlager Kg Sich selbsttaetig hydraulisch einstellender ventilstoessel
JP2782087B2 (ja) * 1989-06-02 1998-07-30 日鍛バルブ株式会社 直動型油圧ラッシュアジャスタ
JP2782088B2 (ja) * 1989-06-02 1998-07-30 日鍛バルブ株式会社 直動型油圧ラッシュアジャスタ
DE4030987A1 (de) * 1990-10-01 1992-04-02 Schaeffler Waelzlager Kg Sich selbsttaetig hydraulisch einstellender ventilstoessel
US5230308A (en) * 1990-11-08 1993-07-27 General Motors Corporation Low mass direct acting hydraulic valve lifter
US5119774A (en) * 1990-11-08 1992-06-09 General Motors Corporation Direct acting hydraulic valve lifter
US5245958A (en) * 1990-11-08 1993-09-21 General Motors Corporation Direct acting hydraulic valve lifter
ES2074385T3 (es) * 1992-04-14 1995-09-01 Alusuisse Lonza Services Ag Alojamiento de forma de taza de un empujador de valvula con ajuste hidraulico automatico para motores de combustion interna con arbol de levas en cabeza.
DE19602012A1 (de) * 1996-01-20 1997-07-24 Schaeffler Waelzlager Kg Durch einen Nocken einer Brennkraftmaschine betätigter Ventilstößel

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0030781A1 (en) * 1979-12-05 1981-06-24 Eaton Corporation Hydraulic tappet for direct-acting valve gear
FR2476740A1 (fr) * 1980-02-22 1981-08-28 Motomak Poussoir de soupape pour moteurs a combustion interne avec arbre a cames en tete
EP0179323A1 (de) * 1984-10-12 1986-04-30 INA Wälzlager Schaeffler KG Sich selbsttätig hydraulisch einstellender Ventilstössel

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4590898A (en) * 1979-12-05 1986-05-27 Eaton Corporation Hydraulic tappet for direct-acting valve gear
EP0140674A3 (en) * 1983-10-28 1986-05-28 Eaton Corporation Lash adjuster with embedded wear face
DE3409236A1 (de) * 1984-03-14 1985-09-19 INA Wälzlager Schaeffler KG, 8522 Herzogenaurach Aeusseres fuehrungsteil fuer einen ventilstoessel
DE3412175A1 (de) * 1984-03-31 1985-10-10 Motomak Motorenbau, Maschinen- u. Werkzeugfabrik, Konstruktionen GmbH, 8070 Ingolstadt Tassenfoermiges gehaeuse eines sich selbsttaetig hydraulisch einstellenden ventilstoessels fuer brennkraftmaschinen mit obenliegender nockenwelle
DE3513162A1 (de) * 1985-04-12 1986-10-16 Goetze Ag, 5093 Burscheid Ventilspielausgleichseinrichtung
DE3615791A1 (de) * 1985-05-22 1986-11-27 Volkswagen AG, 3180 Wolfsburg Abgeschlossene hydraulische laengenausgleichsvorrichtung, insbesondere fuer ventile von brennkraftmaschinen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0030781A1 (en) * 1979-12-05 1981-06-24 Eaton Corporation Hydraulic tappet for direct-acting valve gear
FR2476740A1 (fr) * 1980-02-22 1981-08-28 Motomak Poussoir de soupape pour moteurs a combustion interne avec arbre a cames en tete
EP0179323A1 (de) * 1984-10-12 1986-04-30 INA Wälzlager Schaeffler KG Sich selbsttätig hydraulisch einstellender Ventilstössel

Also Published As

Publication number Publication date
ES2021326B3 (es) 1991-11-01
JPS63131807A (ja) 1988-06-03
BR8706265A (pt) 1988-06-28
JPH0451644B2 (ja) 1992-08-19
US4787347A (en) 1988-11-29
EP0272423A1 (de) 1988-06-29
DE3769297D1 (de) 1991-05-16
DE3639911A1 (de) 1988-06-01

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