EP0340461B1 - Hydraulisches Spielausgleichselement - Google Patents

Hydraulisches Spielausgleichselement Download PDF

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Publication number
EP0340461B1
EP0340461B1 EP89105849A EP89105849A EP0340461B1 EP 0340461 B1 EP0340461 B1 EP 0340461B1 EP 89105849 A EP89105849 A EP 89105849A EP 89105849 A EP89105849 A EP 89105849A EP 0340461 B1 EP0340461 B1 EP 0340461B1
Authority
EP
European Patent Office
Prior art keywords
oil
compensation element
clearance compensation
sleeve
housing
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
EP89105849A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0340461A1 (de
Inventor
Walter Dipl.-Ing.(Tu) Speil
Bolko Schuseil
Dieter Schmidt
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 EP0340461A1 publication Critical patent/EP0340461A1/de
Application granted granted Critical
Publication of EP0340461B1 publication Critical patent/EP0340461B1/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
    • 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
    • F01L2307/00—Preventing the rotation of tappets

Definitions

  • the invention relates to a hydraulic lash adjuster for driving a valve of an internal combustion engine with a housing in which a hollow piston which is pressurized by an oil check valve is mounted and which surrounds an oil storage space which communicates with an interior of the hollow piston via an oil passage and into which a sleeve is connected is used, which forms with part of its wall an oil duct between an oil inlet opening of the housing and an upper region of the oil reservoir.
  • Such a game compensation element is described in DE-A-3006644.
  • the play compensation element of DE-A-3006644 is intended for an internal combustion engine with an overhead camshaft. It should be able to rotate about its longitudinal axis during operation. As a result, due to the inclined position of the longitudinal axis in the installed position, the opening of the oil guide channel is higher or lower depending on the rotary position. If the orifice is low, the volume of oil that the oil guide channel retains in the oil reservoir when there is no oil pressure at the oil inlet opening is significantly smaller than when the orifice is higher. It must be ensured that Even under unfavorable operating conditions, the oil level in the oil reservoir cannot drop so far that air can enter the interior of the hollow piston through the oil passage.
  • DE-A-3638202 describes a lash adjuster for an internal combustion engine with an underlying camshaft.
  • An anti-rotation element is inserted into an opening in the housing. This prevents the play compensation element in the engine block from rotating about its longitudinal axis.
  • the breakthrough is in the oil reservoir. Oil can escape through them. In the case of particularly unfavorable operating modes of the engine, the oil reservoir can empty and air can enter the interior of the hollow piston. This is undesirable.
  • the object of the invention is to design a lash adjuster of the type mentioned in such a way that its housing in the engine block is guided non-rotatably about the longitudinal axis and the oil supply is ensured in the oil storage space.
  • the above object is achieved in a lash adjuster of the type mentioned above in that the sleeve has a shape in which an anti-rotation body is supported, which is inserted into an opening in the housing, that the sleeve covers the oil reservoir against the opening and that the oil duct at a first circumferential point opens into the oil reservoir, which is in the non-rotatably installed position of the play compensation element when the longitudinal axis is inclined higher than other circumferential points.
  • the sleeve not only forms the oil guide channel, but also the anti-rotation body is arranged in such a way that no oil can escape from the oil reservoir through the opening. Because the Anti-rotation body prevents rotation of the housing about the longitudinal axis and the mouth of the oil guide channel is placed in a position that is high with respect to the inclined position of the longitudinal axis in the installation position, ensuring that the oil storage space remains oil-filled even when the oil guide channel runs empty through the oil inlet opening.
  • the oil passage opens into this at a second circumferential location of the oil reservoir, which is offset by approximately 180 ° with respect to the first circumferential location. This ensures that the oil passage is low compared to the mouth. As a result, the oil volume of the oil reservoir is essentially available for the interior of the hollow piston. The volume of the oil reservoir can accordingly be small. This favors a compact structure of the game compensation element.
  • the shape of the sleeve forms an annular channel which is open to the oil inlet opening and which leads to the oil reservoir only via the oil guide channel.
  • This ring channel serves on the one hand as a receptacle and cover for the anti-rotation body. On the other hand, it directs the oil from the oil inlet opening, which can be offset on the circumference of the housing with respect to the oil guide channel, to the oil guide channel.
  • the roller tappet has a housing (1) on which a bolt (2) is fixed.
  • a roller (4) is mounted on the bolt (2) via needle rollers (3).
  • a two-part lifting piston (6, 7) is slidably mounted in a recess (5) of the housing (1).
  • a check valve (8) consisting of a valve cap (9), a compression spring (10) and a valve ball (11), is arranged on its lower part (7).
  • the check valve (8) provides a connection between an interior (12) of the hollow piston (6, 7) and an inside Housing (1) behind the hollow piston (6, 7) existing pressure chamber (13).
  • a pressure spring (14) is arranged in the pressure chamber (13), which acts on the piston lower part (7) and presses the piston upper part (6) against a retaining cap (15), which is fixed to the housing (1) .
  • the upper part (6) has a dome-shaped receptacle (16) for a pressure ball (17).
  • annular part (18) is placed on the housing (1) and is ground on its outer surface (19).
  • the ring part (18) is provided at one end with a neck (20) which is welded to the housing (1). With its other end (21), the ring part (18) sits on a step (22) of the housing (1). It can also be welded to the housing (1) there.
  • the ring part (18) is provided with an opening (23) into which an anti-rotation body (24) is inserted.
  • This is a needle roller, which - without a rolling function - serves as a guide body in the event of an axial displacement of the roller tappet in the direction of the longitudinal axis (L) and to prevent rotation about the longitudinal axis (L).
  • a sleeve (25) is arranged inside the ring part (18) and surrounds the housing (1) in the region of its recess (5).
  • the sleeve (25) is fixed at one end in the area of the step (22) close to the housing (1) and to the ring part (18).
  • the sleeve (25) forms an annular channel (26) which is open to an oil inlet opening (27) provided on the annular part (18).
  • the anti-rotation body (24) is supported in the area of the ring channel (26) on the sleeve (25). Following the ring channel (26), the sleeve (25) lies closely against the ring part (18).
  • Oil guide channel (28) formed by a corresponding bead of the sleeve (25).
  • the oil guide channel (28) is open at an opening (29) to an oil reservoir (30) which lies within the sleeve (25) and extends around the housing (1).
  • the oil reservoir (30) is connected to the interior (12) of the hollow piston (6, 7) via an oil passage (31, 32, 33).
  • an oil passage hole (31) is provided on the housing (1) and a further oil passage hole (32) is provided on the hollow piston (6, 7).
  • An annular gap (33) connecting them runs between the oil passage bores (31, 32).
  • the vertical direction (V) is shown in FIGS. 1 and 6.
  • the longitudinal axis (L) of the roller tappet is at an acute angle (a) to the vertical (V).
  • a At the bottom of the roller (4) there is a cam, not shown, of a camshaft below.
  • the pressure ball (17) acts on a rod, not shown, for controlling a valve of the engine.
  • the exemplary embodiment according to FIGS. 1 to 3 is provided for an installation position in which the anti-rotation body (24) lies at a circumferential point of a cross-sectional area that is radial and perpendicular to the longitudinal axis (L). This circumferential point is higher in relation to the vertical (V) than all other circumferential points of this cross-sectional plane.
  • the oil guide channel (28) lies with the anti-rotation body (24). Its mouth (29) is therefore higher in relation to the vertical (V) than all other circumferential points which lie on a cross-sectional plane that is radial to the longitudinal axis (L). The oil guide channel (28) thus opens into the highest position of the oil reservoir (30) in the installed position.
  • the oil inlet opening (27) is offset on the circumference of the ring part (18) relative to the anti-rotation body (24) by 90 °.
  • a further oil opening (34), which is open to the ring channel (26), is provided on the ring part (18) offset by 180 ° relative to the oil inlet opening (27).
  • the ring channel (26) creates a connection between the oil inlet opening (27) and the oil opening (34) bypassing the oil reservoir (30). Oil is passed through the oil opening (34) in the engine block to another roller tappet.
  • the oil passage bore (31) is offset on the circumference of the housing (1) with respect to the anti-rotation body (24) and the mouth (29) by 180 °. It is therefore in the installed position in relation to the vertical (V) at the lowest point of a radial cross-sectional plane passing through it and perpendicular to the longitudinal axis (L).
  • Oil entering through the oil inlet opening (27) passes through the ring channel (26) to the oil guide channel (28) and enters the oil reservoir (30) through the mouth (29). Oil enters the interior (12) through the oil passage (31, 32, 33) and from there via the check valve (8) into the pressure chamber (13). If the ring channel (26) is emptied, the oil remains in the oil reservoir (30), so that even in special operating cases no air can get into the interior (12) and from there into the pressure chamber (13). Since the mouth (29) is at the highest and the oil passage bore (31) is at a very low point in the oil reservoir (30), essentially the entire oil volume of the oil reservoir (30) is available for refilling the interior (12).
  • the oil inlet opening (27) is provided in relation to the vertical (V) at the highest circumferential point of a vertical plane passing through it and radial to the longitudinal axis (L). Accordingly, the oil guide channel (28) connects directly to the oil inlet opening (27).
  • the Oil through-hole (31) is offset by 180 ° on the circumference with respect to oil-guiding channel (28) (cf. FIG. 5 - in FIG. 6, the oil-through hole (31) is shown offset by 180 ° from its actual position in order to simplify the drawing).
  • the mouth (29) is at the highest and the oil passage bore (31) at the very low point of the oil reservoir (30).
  • the anti-rotation body (24) is offset on the circumference of the ring part (18) with respect to the oil inlet opening (27) by 90 °.
  • a bead is provided on the sleeve (25) as a formation (35) for supporting the anti-rotation body (24).
  • the oil guide channel (28) lies at the oil inlet opening (27) and is also formed by a bead of the sleeve (25).
  • the oil guide channel (28) is offset on the circumference of the sleeve (25) by 180 ° with respect to the formation (35).
  • a further sleeve (36) is placed on the housing (1).
  • the further oil guide channel (37) ensures that the oil passage bore (31) is in communication with the lowest possible point in the oil reservoir (30).
  • the oil passage bore (31) itself cannot be placed in the area of the mouth of the further oil guide channel (37).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP89105849A 1988-04-30 1989-04-04 Hydraulisches Spielausgleichselement Expired - Lifetime EP0340461B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3814700 1988-04-30
DE3814700A DE3814700A1 (de) 1988-04-30 1988-04-30 Hydraulisches spielausgleichselement

Publications (2)

Publication Number Publication Date
EP0340461A1 EP0340461A1 (de) 1989-11-08
EP0340461B1 true EP0340461B1 (de) 1991-08-07

Family

ID=6353296

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89105849A Expired - Lifetime EP0340461B1 (de) 1988-04-30 1989-04-04 Hydraulisches Spielausgleichselement

Country Status (4)

Country Link
US (1) US4876994A (ja)
EP (1) EP0340461B1 (ja)
JP (1) JPH0641724B2 (ja)
DE (2) DE3814700A1 (ja)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4023886A1 (de) * 1990-07-27 1992-01-30 Bayerische Motoren Werke Ag Rollenstoessel mit einem hydraulischen ausgleichselement
DE4023885A1 (de) * 1990-07-27 1992-01-30 Bayerische Motoren Werke Ag Rollenstoessel mit hydraulischem ventilspiel-ausgleich
DE4128813A1 (de) * 1991-08-30 1993-03-04 Schaeffler Waelzlager Kg Hydraulischer rollenstoessel
US5178107A (en) * 1991-11-21 1993-01-12 Morel Jr Edward J Valve lifter
US5127374A (en) * 1991-11-21 1992-07-07 Morel Jr Edward J Valve lifter
US5361733A (en) * 1993-01-28 1994-11-08 General Motors Corporation Compact valve lifters
DE4302877C2 (de) * 1993-02-02 1996-04-11 Schaeffler Waelzlager Kg Stößel
US5273005A (en) * 1993-03-11 1993-12-28 General Motors Corporation Enlarged shaft roller lifter with retention means
DE4324756C2 (de) * 1993-07-23 1997-06-12 Iav Motor Gmbh Verdrehsicherung für einen Ventilstößel
DE4442057B4 (de) * 1994-11-25 2005-07-28 Ina-Schaeffler Kg Hydraulische Spielausgleichsvorrichtung
US5673661A (en) * 1995-11-27 1997-10-07 Jesel; Daniel Henry Valve lifter
DE19603916A1 (de) * 1996-02-03 1997-08-07 Schaeffler Waelzlager Kg Stößel für den Ventiltrieb einer Brennkraftmaschine
DE19748164A1 (de) * 1997-10-31 1999-05-06 Schaeffler Waelzlager Ohg Rollenstößel
DE10332981A1 (de) * 2003-07-21 2005-02-10 Bayerische Motoren Werke Ag Ventilströßeleinrichtung, insbesondere drehgesicherter Tassenstößel mit gekrümmter Nockenfolgefläche
DE102004056457A1 (de) * 2004-11-23 2006-06-08 Schaeffler Kg Tassenstößel für eine Brennkraftmaschine
DE102007046332A1 (de) 2007-09-28 2009-04-02 Schaeffler Kg Wälzlager mit zylindrischen Wälzkörpern und zwischen diesen angeordneten Trennrollen sowie Ventiltrieb mit dem Wälzlager

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2688319A (en) * 1953-08-14 1954-09-07 Johnson Products Inc Hydraulic tappet oil reservoir control
DE3006644A1 (de) * 1980-02-22 1981-09-03 Motomak Motorenbau, Maschinen- u. Werkzeugfabrik, Konstruktionen GmbH, 8070 Ingolstadt Ventilstoessel fuer brennkraftmaschinen mit obenliegender nockenwelle
DE3500425A1 (de) * 1985-01-09 1986-07-10 Motomak Motorenbau, Maschinen- u. Werkzeugfabrik, Konstruktionen GmbH, 8070 Ingolstadt Hydraulischer tassenstoessel fuer verbrennungsmotoren
US4607599A (en) * 1985-05-15 1986-08-26 Eaton Corporation Roller follower hydraulic tappet
US4584976A (en) * 1985-06-20 1986-04-29 Eaton Corporation Reservoir height extender for lash adjuster assembly
US4633827A (en) * 1985-10-07 1987-01-06 Eaton Corporation Hydraulic lash adjuster with combined reservoir extension and metering system
DE3622245A1 (de) * 1986-07-02 1988-01-14 Ford Werke Ag Rollenstoesselanordnung mit verdrehsicherung, insbesondere fuer brennkraftmaschinen
DE3638202A1 (de) * 1986-11-08 1988-05-19 Schaeffler Waelzlager Kg Hydraulisches spielausgleichselement

Also Published As

Publication number Publication date
EP0340461A1 (de) 1989-11-08
DE3814700A1 (de) 1989-11-09
JPH01313606A (ja) 1989-12-19
JPH0641724B2 (ja) 1994-06-01
DE58900201D1 (de) 1991-09-12
US4876994A (en) 1989-10-31

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