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EP0010768A1 - Dispositif hydraulique de rattrapage - Google Patents

Dispositif hydraulique de rattrapage Download PDF

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Publication number
EP0010768A1
EP0010768A1 EP79104279A EP79104279A EP0010768A1 EP 0010768 A1 EP0010768 A1 EP 0010768A1 EP 79104279 A EP79104279 A EP 79104279A EP 79104279 A EP79104279 A EP 79104279A EP 0010768 A1 EP0010768 A1 EP 0010768A1
Authority
EP
European Patent Office
Prior art keywords
hydraulic fluid
storage space
air
cylinder
space
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
EP79104279A
Other languages
German (de)
English (en)
Other versions
EP0010768B1 (fr
Inventor
Gerhard Ing. Grad Turlach
Diethard Ing. Grad Michel
Günter Hetterscheidt
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.)
Kamax Werke Rudolf Kellermann GmbH and Co KG
Original Assignee
Kamax Werke Rudolf Kellermann GmbH and Co 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 Kamax Werke Rudolf Kellermann GmbH and Co KG filed Critical Kamax Werke Rudolf Kellermann GmbH and Co KG
Priority to AT79104279T priority Critical patent/ATE980T1/de
Publication of EP0010768A1 publication Critical patent/EP0010768A1/fr
Application granted granted Critical
Publication of EP0010768B1 publication Critical patent/EP0010768B1/fr
Expired 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
    • 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 a hydraulic lash adjuster, in particular for the control of the valves of internal combustion engines, with a piston displaceably guided in a cylinder and a working space formed between the piston and the cylinder and a largely liquid-tight storage space for hydraulic fluid arranged in the piston and / or in the cylinder , wherein the storage space is connected to the working space via a channel in which a check valve is arranged and wherein the working space is connected to the storage space via a throttle gap.
  • Such a hydraulic lash adjuster is known from DE-OS 25 17 370, namely in the training as an element supporting a plunger.
  • the hydraulic fluid should be filled into the work area and the storage room completely free of air.
  • the storage space is designed to be largely liquid-tight to the outside, ie sealed by a hose section made of rubber-like material against the escape of liquid.
  • the atmosphere or the oil pressure of the lubricating oil circuit acts on the outside of the hose section.
  • the bellows-like hose section is designed and installed between the piston and cylinder of the compensating element in such a way that it is able to additionally absorb hydraulic fluid in the reservoir by bulging.
  • the hose section effectively prevents air from penetrating into the hydraulic fluid of the compensating element; on the other hand, only the atmospheric pressure or the pressure of the lubricating oil supply acts reliably in the reservoir.
  • the leakage amount in the throttle gap very precisely so that this element can work satisfactorily in a speed range. If the element is aligned at low speeds, it will fail at high speeds or vice versa. Both inflation and deflation can occur, both of which are harmful. Inflation can lead to the violent destruction of the valve train. When pumping empty, the required valve clearance is no longer maintained.
  • DE-OS 28 09 055 also shows a hydraulic lash adjuster of the type in question, an elastic compensating element being arranged in the storage space, the inside of which is connected to the atmospheric pressure, so that atmospheric pressure is always present in the storage space in this way.
  • the compensating element serves at the same time for the liquid-tight design of the storage space to the outside. It can consist of a tube section, one end of which is closed. In this element, too, the working space and the storage space are filled with hydraulic fluid in an air-free manner, atmospheric air being located within the rubber-like compensating element. Since the basic structure of this game compensation element is the same as that of DE-OS 25 17 370, there are also the identical disadvantages here.
  • hydraulic fluid can only be refilled from the storage room into the working area with the check valve open if there is a negative pressure in the working area compared to the atmospheric pressure, so that there is a corresponding pressure drop for the liquid supply.
  • the mode of operation of this play compensation element is also unsatisfactory over a wide speed range. In particular at high speeds, the pressure drop required to refill the hydraulic fluid in the work area occurs only for a short time so that the required amount can no longer be added.
  • DE-PS 12 35 658 also shows a self-sufficient element with a specially designed check valve between the work space and the storage space.
  • the back of the storage room is also connected to the atmosphere and is acted upon by the pressure of a spring via an auxiliary piston.
  • Check valve and throttle gap are structurally combined here by the check valve being designed as a plate valve.
  • the invention has for its object to form a self-sufficient Spielas Dermaselement, which is therefore independent of the foaming of the engine oil, so that neither an inflation nor an empty pumping of the work space occurs under operating conditions, especially at high speeds.
  • an air cushion that is to say a pointer element, which is suitable for absorbing pressure peaks.
  • this in turn creates the risk of the hydraulic fluid foaming due to the mixing of the air cushion with the hydraulic fluid.
  • the penetration of the hydraulic fluid mixed with air into the work space must be prevented, ie the fluid entering the work space must be largely free of air, ie air may only contain up to a certain limit. It is also necessary to ensure, especially at high speeds Pay that there is a sufficient pressure drop to add the amount of leakage between the work area and the storage area in the short time available.
  • the storage space is sealed from the atmosphere in a pressure-tight manner and is only partially filled with hydraulic fluid and partially with a gas cushion, and in the storage space an element preventing the foaming of the hydraulic fluid or the entry of air-mixed hydraulic fluid into the working space is provided is.
  • the air cushion is arranged within the pressure-tight storage space and does not limit the storage space itself from the atmosphere. It is only with this training that the possibility is created that the air or gas cushion can absorb pressure peaks and also release it in the direction of the working area if, after each valve actuation, the leakage quantity which has escaped through the throttle gap between the working area and the storage area must be replenished.
  • the pressure peaks that occur are used favorably as a positive pressure drop. This pressure drop is much greater and is available at a comparatively earlier point in time.
  • the element which prevents the foaming of the hydraulic fluid can be, for example, a seal in the storage space that separates the air from the hydraulic fluid.
  • the air can also be enclosed in an airtight balloon, ring or the like, which is inserted into the storage space, which is itself again pressure-tight.
  • the air can also be separated in the storage space by a sealing plate lying against the cylinder wall, so that on the one hand in this way the foaming of the hydraulic fluid is hindered, but on the other hand pressure peaks can be effectively transferred back.
  • the element which prevents the foaming of the hydraulic fluid can be an erectile tissue filling in the storage space.
  • the erectile tissue can either have an airtight or liquid-tight surface or consist of a sponge-like material that is impregnated with hydraulic fluid with a predetermined proportion of air. It is essential here to hold the air finely distributed in the spaces or in the interior of the erectile tissue through the erectile tissue, where it forms an air cushion overall, but on the other hand there is no possibility of foaming to any significant extent within the hydraulic fluid.
  • a throttle cross section for air separation is provided in the storage room in the vicinity of the check valve leading to the work area. This throttle cross section can be made from a sieve or filter. It is essential here that air is separated on the one hand, that is to say it is prevented from entering the work space.
  • the throttle cross-section must not have such a throttling effect that the pressure drop between the air cushion and the working area in the throttle cross-section is built up in such a way that it can no longer have a beneficial effect on refilling the leakage quantity.
  • the valve lash adjuster shown in Fig. 1 is used as a tappet with the camshaft below. It essentially consists of two parts which can be displaced relative to one another, namely a piston 1 and an associated cylinder 2.
  • the cylinder 2 itself is also sliding again in an ent speaking housing part, which is not shown here, stored.
  • a reservoir 3 is provided in the piston 1 and is filled with hydraulic fluid.
  • the storage space 3 is designed to be pressure-tight via the seal 4.
  • a working space 5 is also provided, which is also filled with hydraulic fluid.
  • a check valve 7 is switched into the connecting bore 6 between the storage space 3 and the working space 5.
  • the piston 1 is supported with respect to the cylinder 2 by the spring 8, which can also be provided elsewhere, but with the same effect.
  • the connection from the working space 5 to the storage space 3 results via the throttling gap 9 between the cylinder 2 and the piston 1, which is designed as an annular gap.
  • the circuit of the hydraulic fluid is thus clearly determined with the help of the check valve 7. Hydraulic fluid can only reach the working space 5 from the storage space 3 via the connecting bore 6. On the other hand, hydraulic fluids displaced from the working space 5 can only reach the storage space 3 via the throttle gap 9.
  • the throttle gap 9 ends at an annular groove 10 with a bore 11 which connects to the storage space.
  • a balloon 12 is accommodated in the storage space 3 as an enclosed air cushion, which therefore accommodates an air or gas pistol inside and is otherwise designed to be impermeable to liquids.
  • This balloon 12 is suitable for absorbing, storing and briefly acting pressure peaks, such as those which occur in particular in the case of high expansion numbers in internal combustion engines, and to emit or let them act in the subsequent cycle period as a positive pressure difference with respect to the working space 5, in such a way that the previously through the throttle gap 9 recirculated amount of liquid into the work space while opening the check valve 7 is refilled.
  • the balloon 12 receives the air cushion 13 in its interior, so that the air has no possibility of foaming with the hydraulic fluid 14.
  • the air or gas is therefore present, but effectively separated.
  • the corresponding pressure can build up briefly in the balloon 12 or on the air cushion 13, because the air, in contrast to the hydraulic fluid 14, is compressible.
  • Fig. 2 shows a similarly designed play compensation element, but here no balloon is provided, but a floating seal 15, which separates the air cushion 13 from the hydraulic fluid 14.
  • the seal 4 is decisive for the corresponding pressure in the air cushion 13 can build up briefly, This air cushion 13 also compensates for pressure peaks due to its presence, ie keeps them away from the other mechanical parts of the valve train.
  • FIG. 3 shows a floating body 16 which separates the air cushion 13 from the hydraulic fluid 14.
  • the floating body can be made relatively thick-walled and have a microporous structure.
  • Guides 18 are provided to hold and guide the rubber buffer 17 with the enclosed air cushion 13 on its stem.
  • a channel 19 is provided, which is closed with a plug 20 after the corresponding venting of the storage space 3.
  • FIG. 5 and 6 show the application of the invention to a hydraulic bucket tappet, such as is used with an overhead camshaft.
  • an indented annular plate 21 is provided here, both of which ensure a pressure-tight design of the storage space 3.
  • cavernous bodies 22 are provided either coherently or as a loose bed, which receive the air cushion 13 finely distributed between them, so that this air cannot detach itself from the cavernous bodies 22 even at high acceleration forces and therefore does not foam up.
  • the air cushion 13 is sufficient to absorb and release pressure peaks and thus to act as has already been described.
  • an air ring 23 which accommodates the air cushion 13 in its interior, is stored in the reservoir 3 with the hydraulic fluid 14.
  • FIG. 7 in turn shows a hydraulic tappet, the storage space 3 of which is provided with a filling of swelling bodies 22 that completely occupies it, as has already been explained with reference to the tappet according to FIG. 5.
  • the swelling bodies 22 can be designed with a dense surface, that is to say represent airtight bodies, for example glass spheres, plastic beads or the like.
  • FIGS. 9 and 10 show constructions in which the air or the air cushion 13 is introduced into the storage space 3 without separation from the hydraulic fluid 14. This does not hinder the foaming of the hydraulic fluid at high speeds.
  • a throttle plate 24 with an opening 25 and an air separating screen 26 according to FIG. 10 are arranged in the vicinity of the check valve 7 in the area of the connecting bore 6, a throttle plate 24 with an opening 25 and an air separating screen 26 according to FIG. 10 are arranged. Both measures have the effect that the foamed air in the storage space 3 is separated on the throttle plate 24 or the air separating screen 26 when the work space 5 is refilled. to such an extent or percentage, the residual air still remaining, which then enters the working space 5, does not hinder the working or supporting of the piston 1 on the working space 5.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Braking Arrangements (AREA)
EP79104279A 1978-11-03 1979-11-02 Dispositif hydraulique de rattrapage Expired EP0010768B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79104279T ATE980T1 (de) 1978-11-03 1979-11-02 Hydraulisches spielausgleichselement.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2847699A DE2847699C3 (de) 1978-11-03 1978-11-03 Hydraulisches Spielausgleichselement
DE2847699 1978-11-03

Publications (2)

Publication Number Publication Date
EP0010768A1 true EP0010768A1 (fr) 1980-05-14
EP0010768B1 EP0010768B1 (fr) 1982-05-05

Family

ID=6053770

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79104279A Expired EP0010768B1 (fr) 1978-11-03 1979-11-02 Dispositif hydraulique de rattrapage

Country Status (3)

Country Link
EP (1) EP0010768B1 (fr)
AT (1) ATE980T1 (fr)
DE (1) DE2847699C3 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0030781A1 (fr) * 1979-12-05 1981-06-24 Eaton Corporation Poussoir hydraulique pour vanne à entrainement direct
FR2519074A1 (fr) * 1981-12-28 1983-07-01 Stanadyne Inc Regleur hydraulique pour culbuterie de moteur a combustion interne
EP0052704B1 (fr) * 1980-11-21 1986-04-16 RIV-SKF OFFICINE DI VILLAR PEROSA S.p.A Poussoir à auto-régulation hydraulique pour moteurs thermiques
GB2185549A (en) * 1985-10-15 1987-07-22 Honda Motor Co Ltd Hydraulic lash adjuster for use in a valve operating mechanism
FR2677704A1 (fr) * 1991-06-14 1992-12-18 Renault Dispositif hydraulique de rattrapage de jeu pour distribution de moteur a combustion interne.
DE4442932A1 (de) * 1994-12-02 1996-06-05 Schaeffler Waelzlager Kg Hydraulisches Spielausgleichselement für eine Ventilsteuerung einer Brennkraftmaschine
DE10010597A1 (de) * 2000-03-03 2001-09-06 Mahle Ventiltrieb Gmbh Hydraulisches Spielausgleichselement, insbesondere für die Steuerung der Ladungswechselventile eines Verbrennungsmotors
WO2007054787A1 (fr) 2005-11-08 2007-05-18 Toyota Jidosha Kabushiki Kaisha Dispositif etanche de rattrapage de jeu et methode de reglage de la quantite de liquide enferme dans ledit dispositif
US20100282194A1 (en) * 2008-08-28 2010-11-11 Toyota Jidosha Kabushiki Kaisha Sealed-type lash adjuster

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4917059A (en) * 1988-03-31 1990-04-17 Nippon Seiko Kabushiki Kaisha Valve lash adjuster
DE4026793A1 (de) * 1990-08-24 1992-03-05 Freudenberg Carl Fa Hydraulisches ventilspielausgleichselement fuer brennkraftmaschinen
DE4203897C2 (de) * 1992-02-11 1994-01-27 Freudenberg Carl Fa Hydraulisches Ventilspielausgleichselement

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2109816A (en) * 1935-12-21 1938-03-01 Packard Motor Car Co Hydraulic valve tappet
US2246338A (en) * 1938-11-17 1941-06-17 Carrier Corp Metering damper outlet
US2694388A (en) * 1950-12-30 1954-11-16 Thompson Prod Inc Self-contained hydraulic valve train length adjusting mechanism
FR1251366A (fr) * 1959-12-08 1961-01-20 Perfectionnements apportés aux dispositifs de rattrapage automatique du jeu des soupapes commandées par came, notamment pour moteurs à combustion interne
US3025842A (en) * 1961-02-06 1962-03-20 Gen Motors Corp Self-contained hydraulic lash adjuster

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2096257A (en) * 1935-06-17 1937-10-19 Moorhouse Alfred Hydraulic valve tappet
US2246330A (en) * 1940-03-14 1941-06-17 Eaton Mfg Co Hydraulic tappet construction
DE1911550A1 (de) * 1969-03-07 1970-09-24 Hanning Elektro Werke Heizungsumwaelzpumpe
DE2517370A1 (de) * 1975-04-19 1976-10-28 Volkswagenwerk Ag Hydraulische spielausgleichsvorrichtung
DE2911550C2 (de) * 1978-03-23 1982-12-23 Aisin Seiki K.K., Kariya, Aichi Ventilspiel-Ausgleichsvorrichtung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2109816A (en) * 1935-12-21 1938-03-01 Packard Motor Car Co Hydraulic valve tappet
US2246338A (en) * 1938-11-17 1941-06-17 Carrier Corp Metering damper outlet
US2694388A (en) * 1950-12-30 1954-11-16 Thompson Prod Inc Self-contained hydraulic valve train length adjusting mechanism
FR1251366A (fr) * 1959-12-08 1961-01-20 Perfectionnements apportés aux dispositifs de rattrapage automatique du jeu des soupapes commandées par came, notamment pour moteurs à combustion interne
US3025842A (en) * 1961-02-06 1962-03-20 Gen Motors Corp Self-contained hydraulic lash adjuster

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0030781A1 (fr) * 1979-12-05 1981-06-24 Eaton Corporation Poussoir hydraulique pour vanne à entrainement direct
EP0052704B1 (fr) * 1980-11-21 1986-04-16 RIV-SKF OFFICINE DI VILLAR PEROSA S.p.A Poussoir à auto-régulation hydraulique pour moteurs thermiques
FR2519074A1 (fr) * 1981-12-28 1983-07-01 Stanadyne Inc Regleur hydraulique pour culbuterie de moteur a combustion interne
GB2185549A (en) * 1985-10-15 1987-07-22 Honda Motor Co Ltd Hydraulic lash adjuster for use in a valve operating mechanism
GB2185549B (en) * 1985-10-15 1990-01-24 Honda Motor Co Ltd Hydraulic lash adjuster for use in a valve operating mechanism
FR2677704A1 (fr) * 1991-06-14 1992-12-18 Renault Dispositif hydraulique de rattrapage de jeu pour distribution de moteur a combustion interne.
DE4442932A1 (de) * 1994-12-02 1996-06-05 Schaeffler Waelzlager Kg Hydraulisches Spielausgleichselement für eine Ventilsteuerung einer Brennkraftmaschine
DE10010597A1 (de) * 2000-03-03 2001-09-06 Mahle Ventiltrieb Gmbh Hydraulisches Spielausgleichselement, insbesondere für die Steuerung der Ladungswechselventile eines Verbrennungsmotors
WO2007054787A1 (fr) 2005-11-08 2007-05-18 Toyota Jidosha Kabushiki Kaisha Dispositif etanche de rattrapage de jeu et methode de reglage de la quantite de liquide enferme dans ledit dispositif
US7779805B2 (en) 2005-11-08 2010-08-24 Toyota Jidosha Kabushiki Kaisha Sealed lash adjuster and method for adjusting amount of liquid sealed in sealed lash adjuster
CN101305166B (zh) * 2005-11-08 2010-09-29 丰田自动车株式会社 密封游隙调节器和用于调节密封在密封游隙调节器中的液体量的方法
CN101915136B (zh) * 2005-11-08 2011-12-21 丰田自动车株式会社 密封游隙调节器
US20100282194A1 (en) * 2008-08-28 2010-11-11 Toyota Jidosha Kabushiki Kaisha Sealed-type lash adjuster
EP2317086A1 (fr) * 2008-08-28 2011-05-04 Toyota Jidosha Kabushiki Kaisha Dispositif de réglage d'arrivée hermétiquement étanche
EP2317086A4 (fr) * 2008-08-28 2011-08-31 Toyota Motor Co Ltd Dispositif de réglage d'arrivée hermétiquement étanche

Also Published As

Publication number Publication date
EP0010768B1 (fr) 1982-05-05
DE2847699C3 (de) 1982-03-04
ATE980T1 (de) 1982-05-15
DE2847699A1 (de) 1980-05-14
DE2847699B2 (de) 1981-07-02

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