EP0262256A1 - Arbre à came pour un moteur à piston - Google Patents

Arbre à came pour un moteur à piston Download PDF

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Publication number
EP0262256A1
EP0262256A1 EP86113744A EP86113744A EP0262256A1 EP 0262256 A1 EP0262256 A1 EP 0262256A1 EP 86113744 A EP86113744 A EP 86113744A EP 86113744 A EP86113744 A EP 86113744A EP 0262256 A1 EP0262256 A1 EP 0262256A1
Authority
EP
European Patent Office
Prior art keywords
camshaft
engine
piston engine
axial direction
reciprocating piston
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Withdrawn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
EP86113744A
Other languages
German (de)
English (en)
Inventor
Werner Dipl.-Ing. Emmel
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
Priority to EP86113744A priority Critical patent/EP0262256A1/fr
Publication of EP0262256A1 publication Critical patent/EP0262256A1/fr
Withdrawn legal-status Critical Current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
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L1/053—Camshafts overhead type
    • F01L1/0532—Camshafts overhead type the cams being directly in contact with the driven valve
    • 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
    • F01L13/0036—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • F01L13/0042—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction with cams being profiled in axial and radial direction

Definitions

  • the invention relates to a camshaft of a reciprocating piston engine.
  • the invention also relates to a method for changing the control times of valves of a reciprocating piston engine with the aid of such a camshaft.
  • a camshaft is used to control the valves of a reciprocating piston engine.
  • the invention is therefore based on the object of proposing a camshaft of a reciprocating piston engine, with which it is possible in a structurally simple manner to change the control times of the valves of the reciprocating piston engine, in particular to adapt it to the current load state of the engine.
  • the camshaft according to the invention is characterized in that it is displaceable in the axial direction and that the profile of the cams changes in the axial direction over their length.
  • the camshaft according to the invention can also be used for a method for changing the control times of valves of a reciprocating piston engine, the camshaft then being displaced in a controlled manner in the axial direction during the operation of the reciprocating piston engine.
  • the axial displacement of the camshaft is achieved via a link guide by an encoder.
  • the speed, the torque, the amount of air, the fuel throughput and / or the accelerator pedal position of the engine are fed to the transmitter as an input signal.
  • input signals other than those listed can also be fed to the encoder.
  • the construction on which the invention is based has cams whose profile changes in the axial direction over the length with smooth transitions, at least in the area in which the cam controls the valve lifter.
  • the cam ridge line therefore does not run parallel to the axis of the camshaft, but rather, for example, at an angle or in the form of a curve.
  • the camshaft is driven by spur gears, chain or toothed belt, taking into account the axial displaceability.
  • the measures according to the invention make it possible for different cam profiles depending on the axial position of the camshaft are engaged, which results in different tax times.
  • the invention allows the opening and closing times of the valves of the engine to be varied depending on the load condition of the engine.
  • FIG. 1 shows a camshaft 1, the axis of rotation of which is indicated at item 2.
  • a valve 3 rests on it with the upper end of its valve tappet.
  • Fig. 1 it is also shown that the valve plate 5 releases an annular gap at the input of the cylinder 6 of the reciprocating piston engine. This is based on the fact that the tappet 4 is located in the situation shown in FIGS. 1 and 2 on an elevation 7 of the cam of the camshaft 1. See also Fig. 2.
  • valves 3 can take place by means of an axial displacement of the camshaft 1 in the direction of the double arrow 8, this axial displacement being preferably controlled as described at the outset by the load condition of the engine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
EP86113744A 1986-10-03 1986-10-03 Arbre à came pour un moteur à piston Withdrawn EP0262256A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP86113744A EP0262256A1 (fr) 1986-10-03 1986-10-03 Arbre à came pour un moteur à piston

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP86113744A EP0262256A1 (fr) 1986-10-03 1986-10-03 Arbre à came pour un moteur à piston

Publications (1)

Publication Number Publication Date
EP0262256A1 true EP0262256A1 (fr) 1988-04-06

Family

ID=8195481

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86113744A Withdrawn EP0262256A1 (fr) 1986-10-03 1986-10-03 Arbre à came pour un moteur à piston

Country Status (1)

Country Link
EP (1) EP0262256A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011133088A1 (fr) * 2010-04-19 2011-10-27 Scania Cv Ab Dispositif de levée de soupape pour moteur thermique

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR330010A (fr) * 1903-03-06 1903-08-10 Georges Ville Dispositif perfectionné de moteur à explosions
GB1574228A (en) * 1976-12-29 1980-09-03 Peugeot Automobile vehicles
JPS59115408A (ja) * 1982-12-21 1984-07-03 Fuji Heavy Ind Ltd バルブ動作制御装置
EP0116306A1 (fr) * 1983-02-04 1984-08-22 FIAT AUTO S.p.A. Dispositif de réglage de la position axiale d'un arbre à cames avec profil variable, en particulier pour le réglage du système de distribution d'un moteur à combustion interne

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR330010A (fr) * 1903-03-06 1903-08-10 Georges Ville Dispositif perfectionné de moteur à explosions
GB1574228A (en) * 1976-12-29 1980-09-03 Peugeot Automobile vehicles
JPS59115408A (ja) * 1982-12-21 1984-07-03 Fuji Heavy Ind Ltd バルブ動作制御装置
EP0116306A1 (fr) * 1983-02-04 1984-08-22 FIAT AUTO S.p.A. Dispositif de réglage de la position axiale d'un arbre à cames avec profil variable, en particulier pour le réglage du système de distribution d'un moteur à combustion interne

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 8, Nr. 234 (M-334)[1671], 26. Oktober 1984; & JP-A-59 115 408 (FUJI JUKOGYO K.K.) 03-07-1984 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011133088A1 (fr) * 2010-04-19 2011-10-27 Scania Cv Ab Dispositif de levée de soupape pour moteur thermique
RU2513215C1 (ru) * 2010-04-19 2014-04-20 Сканиа Св Аб Устройство подъема клапана для двигателя внутреннего сгорания
US8770161B2 (en) 2010-04-19 2014-07-08 Scania Cv Ab Valve lift device for a combustion engine

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Effective date: 19881007