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DE10117584A1 - Device for lift adjustment of gas exchange valves has slide piece on trailing lever between valve and cam follower, whereby in no-lift position slide piece lies directly in middle of bearing point of cam follower - Google Patents

Device for lift adjustment of gas exchange valves has slide piece on trailing lever between valve and cam follower, whereby in no-lift position slide piece lies directly in middle of bearing point of cam follower

Info

Publication number
DE10117584A1
DE10117584A1 DE10117584A DE10117584A DE10117584A1 DE 10117584 A1 DE10117584 A1 DE 10117584A1 DE 10117584 A DE10117584 A DE 10117584A DE 10117584 A DE10117584 A DE 10117584A DE 10117584 A1 DE10117584 A1 DE 10117584A1
Authority
DE
Germany
Prior art keywords
cam follower
valve
stroke
slide piece
lift
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.)
Withdrawn
Application number
DE10117584A
Other languages
German (de)
Inventor
Willi Roth
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of DE10117584A1 publication Critical patent/DE10117584A1/en
Withdrawn legal-status Critical Current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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0005—Deactivating valves
    • 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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0021—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of rocker arm ratio
    • 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

Landscapes

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

Abstract

The device for lift adjustment of gas exchange valves has a cam follower (3) between the camshaft (1) and valve (9), and slide piece (8) and trailing lever (5) between the valve and cam follower. In the no-lift position the slide piece lies directly in the middle of the bearing point (4) of the cam follower. With displacement of the slide piece in the direction of the valve the valve lift increases linearly while maintaining the same cam lift. An auxiliary spring (7) is connected to the cam follower to keep the cam follower in contact with the camshaft via a pick-up roller (2) during the no-lift state.

Description

Technisches GebietTechnical field

Die Erfindung betrifft eine Vorrichtung zur Kraftstoffeinsparung, zum besseren Ansprechverhalten des Motors und eine Vereinfachung der gesamten Ansaug­ anlage.The invention relates to a device for saving fuel, for better Engine response and simplification of the overall intake investment.

Stand der TechnikState of the art

Bisher wurden Ventilsteuerungen mit festem Hub verwendet und die Drosselwirkung des Einlaßvolumenstromes durch eine Drosselklappe gesteuert.So far, valve controls with a fixed stroke have been used and the throttling effect of the inlet volume flow controlled by a throttle valve.

Beschreibungdescription

Die Erfindung bezieht sich gemäß dem Oberbegriff des Patentanspruchs 1 auf eine Vorrichtung zur Hubverstellung eines Gaswechselventiles im Zylinderkopf einer Brennkraftmaschine, wobei ein mit dem Gaswechselventil zusammenwirkendes Übertragsungselement in Linienberührung steht.According to the preamble of claim 1, the invention relates to a Device for stroke adjustment of a gas exchange valve in the cylinder head Internal combustion engine, one interacting with the gas exchange valve Transmission element is in line contact.

Der Vorteil der Erfindung liegt in seiner platzsparenden Bauweise gegenüber der in DE 199 13 742 A1 beschrieben Vorrichtung, leichteren statischen Bauteilen und wesentlich leichteren oszillierenden Bauteilen.The advantage of the invention lies in its space-saving design compared to that in DE 199 13 742 A1 describes the device, lighter static components and much lighter oscillating components.

Ein weiterer Vorteil besteht darin, daß keine Leerhubkurve und keine Hubkurve erforderlich ist. Die Herstellung der kinematischen bzw. kraftübertragenden Teile ist einfach, da nur gerade Flächen erforderlich sind.Another advantage is that there is no idle stroke curve and no stroke curve is required. The production of the kinematic or force-transmitting parts is easy because only straight surfaces are required.

Die Krafteinwirkung des Schiebestücks 8 für den Verstellbereich des Ventilhubes von Null auf Maximum und umgekehrt erfolgt nur in einer Richtung; d. h. die Geräuschentwicklung ist extrem gering. Des weiteren lassen sich Nockenfolger Nr. 3 und Schlepphebel Nr. 5 mit je nach Platzverhältnissen gleichseitiger Lagerung oder mit gegenüberliegender Lagerung anbringen.The force of the sliding piece 8 for the adjustment range of the valve stroke from zero to maximum and vice versa is only in one direction; ie the noise level is extremely low. Furthermore, cam follower no. 3 and rocker arm no. 5 can be fitted with equilateral bearings or with opposite bearings, depending on the space available.

Je nach Platzverhältnissen im Zylinderkopf läßt sich der Verschiebeweg des Schiebestückes 8 anpassen.Depending on the space available in the cylinder head, the displacement of the sliding piece 8 can be adjusted.

Des weiteren spielen Wärmeausdehnungskoeffizienten der einzelnen Bauteile gegenüber dem Zylinderkopf nahezu keine Rolle.Furthermore, thermal expansion coefficients of the individual components play almost no role compared to the cylinder head.

Claims (1)

Vorrichtung zur Hubverstellung eines Gaswechselventils im Zylinderkopf einer Brennkraftmaschine, wobei
zwischen Nockenwelle (1) und Ventil (9) im wesentlichen ein Nockenfolger (3) mit Abtastrolle (2), ein Schiebestück (8) und ein Schlepphebel (5) in Linenberührung stehend dazwischengeschaltet sind.
Bei Nullhub befindet sich das Schiebestück (8) direkt im Mittelpunkt der Lagerung des Nockenfolgers (3). Dadurch kann kein Ventilhub entstehen.
Bei dem Verschieben des Schiebestücks (8) in Richtung Ventil (9) wächst linear bei gleichbleibendem Nockenhub der Ventilhub auf den Maximalhub.
Um bei Nullhub den Kontakt des Nockenfolgers mit der Abtastrolle auf Nockenwellenkontakt zu halten ist die Hilfsfeder (7) am Nockenfolger angelenkt. Dadurch wird eine Geräuschentwicklung zuverlässig vermieden.
Das Schiebestücke (8) kann zwischen Nullhub und Maximalhub pneumatisch, hydraulisch oder mechanisch verschoben und arretiert werden.
Die Lagerung des Nockenfolgers (3) und des Schlepphebels (5) kann aus Achsen oder Kugelpfannen bestehen. Der Ventilspielausgleich ist vorzugsweise am Schlepphebel (5) in bisher bekannter Weise (hydraulisch) vorzusehen.
Auf Grund der kleinen und leichten oszillierenden Bauteile sind sehr hohe Drehzahlen möglich. Außerdem wird dadurch die Geräuschentwicklung auf ein Mindestmaß reduziert.
Ein Verkanten der einzelnen Bauteile zueinander ist auf Grund der geringen Abstände nicht möglich; die Übertragungsgenauigkeit ist dadurch sehr hoch.
Auf Grund der einfachen Herstellung (gerade Flächen bzw. Rollen) tritt kein erhöhter Verschleiß gegenüber herkömmlichen nicht variablen Ventiltrieben auf.Device for stroke adjustment of a gas exchange valve in the cylinder head of an internal combustion engine, wherein
essentially a cam follower ( 3 ) with a scanning roller ( 2 ), a sliding piece ( 8 ) and a rocker arm ( 5 ) are connected between the camshaft ( 1 ) and the valve ( 9 ) while standing in line contact.
At zero stroke, the sliding piece ( 8 ) is located directly in the center of the bearing of the cam follower ( 3 ). This means that no valve lift can occur.
When the sliding piece ( 8 ) is moved in the direction of the valve ( 9 ), the valve stroke increases linearly to the maximum stroke with the cam stroke remaining the same.
The auxiliary spring ( 7 ) is articulated on the cam follower in order to keep the cam follower in contact with the pickup roller at zero stroke. This reliably prevents noise.
The sliding piece ( 8 ) can be pneumatically, hydraulically or mechanically moved and locked between zero stroke and maximum stroke.
The cam follower ( 3 ) and rocker arm ( 5 ) can be supported by axles or ball sockets. The valve clearance compensation should preferably be provided on the rocker arm ( 5 ) in a previously known manner (hydraulically).
Due to the small and light oscillating components, very high speeds are possible. It also reduces noise to a minimum.
Tilting of the individual components to one another is not possible due to the small distances; the transmission accuracy is very high.
Due to the simple manufacture (straight surfaces or rollers) there is no increased wear compared to conventional non-variable valve trains.
DE10117584A 2001-04-07 2001-04-07 Device for lift adjustment of gas exchange valves has slide piece on trailing lever between valve and cam follower, whereby in no-lift position slide piece lies directly in middle of bearing point of cam follower Withdrawn DE10117584A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE10132642 2001-04-07

Publications (1)

Publication Number Publication Date
DE10117584A1 true DE10117584A1 (en) 2002-10-10

Family

ID=7690736

Family Applications (1)

Application Number Title Priority Date Filing Date
DE10117584A Withdrawn DE10117584A1 (en) 2001-04-07 2001-04-07 Device for lift adjustment of gas exchange valves has slide piece on trailing lever between valve and cam follower, whereby in no-lift position slide piece lies directly in middle of bearing point of cam follower

Country Status (1)

Country Link
DE (1) DE10117584A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1484479A3 (en) * 2003-06-06 2005-08-24 H.P.E. High Performance Engineering S.r.l. Variable-lift timing system for an internal combustion engine
CN102678214A (en) * 2011-03-08 2012-09-19 朱譞晟 Fully variable valve timing and lift mechanism with double independent swing rods
CN104329136A (en) * 2014-09-09 2015-02-04 西华大学 Continuously-variable valve lift control device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1484479A3 (en) * 2003-06-06 2005-08-24 H.P.E. High Performance Engineering S.r.l. Variable-lift timing system for an internal combustion engine
CN102678214A (en) * 2011-03-08 2012-09-19 朱譞晟 Fully variable valve timing and lift mechanism with double independent swing rods
CN102678214B (en) * 2011-03-08 2016-03-30 朱譞晟 The full Variable Valve Time of independent double swing-bar and lift mechanisms
CN104329136A (en) * 2014-09-09 2015-02-04 西华大学 Continuously-variable valve lift control device

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