WO2004083611A1 - Ventiltrieb einer einen zylinderkopf aufweisenden brennkraftmaschine - Google Patents
Ventiltrieb einer einen zylinderkopf aufweisenden brennkraftmaschine Download PDFInfo
- Publication number
- WO2004083611A1 WO2004083611A1 PCT/EP2004/002758 EP2004002758W WO2004083611A1 WO 2004083611 A1 WO2004083611 A1 WO 2004083611A1 EP 2004002758 W EP2004002758 W EP 2004002758W WO 2004083611 A1 WO2004083611 A1 WO 2004083611A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cam carrier
- camshaft
- cam
- fixed
- locking
- Prior art date
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
- F01L13/0015—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
-
- 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
- F01L1/08—Shape of cams
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- 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
-
- 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
- F01L2013/0052—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 provided on an axially slidable sleeve
Definitions
- the invention relates to a valve train having a cylinder head
- Such a device is known from the publication DE 42 30 877 in which a cam carrier is arranged on a basic camshaft in a rotationally fixed and axially displaceable manner.
- the cam carrier consists of a tubular material on which at least one cam is arranged, in which several different cam tracks emerge axially offset from a common base circle.
- An advantageous device for axially displacing a cam carrier is known from the document EP 0 798 451, according to which a worm drive is formed on both sides of the cam carrier, which has a cam track as a recess into which an actuator can engage for axially displacing the cam carrier. So that a cam carrier remains on the basic camshaft in the position into which it was moved by the engagement of the actuator in the worm gear, a locking device is provided, which consists of a locking means arranged in the basic camshaft, which engages in locking grooves, which are worked out in the cam carrier are. According to the three cam tracks that are formed on a cam, three locking grooves are worked out in the cam carrier.
- camshaft-centered arrangement of the latching device is that the basic camshafts and the cylinder head of the internal combustion engine are often made from different materials with different coefficients of thermal expansion. As a result, the camshaft-centered locking device will not lock exactly when the engine is cold or when it is at operating temperature. This effect can be exacerbated by inaccuracies in manufacture, assembly or operational reasons, so that reliable operation of the internal combustion engine is not possible.
- a cylinder head-centered latching device for a basic camshaft with axially displaceable cam carriers is known from the document DE 101 48 243, the basic camshaft being supported in the cylinder head of the internal combustion engine by at least one camshaft bearing comprising the cam carrier.
- the locking device consists of a locking means arranged in the camshaft bearing, which engages in locking grooves which are worked out in the cam carrier.
- a cam carrier with two cams, each of which has two cam tracks, two axially adjacent latching grooves are required in the cam carrier, into which the latching means engages.
- This cylinder head-centered locking device is the high wear that occurs in the camshaft bearing, since a substantial part of the bearing sliding surfaces is used for the locking grooves.
- the base camshaft and the cam carrier are moved to one side of the camshaft bearing by the latching means.
- the locking device requires a good supply of lubricant, which cannot be guaranteed via the precisely fitting and often polished bearing sliding surfaces.
- the invention has for its object to provide a valve train according to the features of the preamble of claim 1, in which the cam carriers are reliably held in their position after displacement regardless of thermal influences.
- a first axial position of the cam carrier is defined in that a first stop surface fixed to the cam carrier abuts a first stop surface fixed to the cylinder head.
- a second axial position of the cam carrier is defined in that a second stop surface fixed to the cam carrier bears against a second stop surface fixed to the cylinder head.
- first cam carrier fixed axial stop surface and the second cam carrier fixed stop surface are side surfaces of the at least one cam of the cam carrier.
- the first stop surface fixed to the cylinder head and the second stop surface fixed to the cylinder head are side surfaces of the at least one camshaft bearing comprising the cam carrier.
- Cam carrier is designed as a locking device.
- the latching device has a latching means which is arranged in the camshaft and is movably mounted in the radial direction, the latching means preferably being pressed outward by a force in the radial direction against the inner surface of the cam carrier.
- at least two circumferential and axially spaced locking grooves are formed on the inside of the cam carrier, the locking grooves being approximately V-shaped in the cam carrier, and as a result of which both sides of the locking groove form a ramp for the locking means.
- the locking grooves could in principle also be formed in the basic camshaft, the locking device being arranged in the cam carrier.
- the radially directed force is the restoring force of a spring element.
- the locking means is a locking bolt, the side of the locking bolt facing the locking grooves being rounded.
- the locking means is a locking ball.
- a cam carrier is arranged on the at least one basic camshaft for each cylinder of the internal combustion engine.
- valve train according to the invention of an internal combustion engine is illustrated and explained below using an exemplary embodiment in conjunction with seven figures.
- FIG. 1 side view of a four-cylinder internal combustion engine according to the invention
- FIG. 2 representation of the internal combustion engine of Fig. 1 in view ll-ll of
- FIG. 3 shows a perspective view of the camshafts installed in the internal combustion engine of FIGS. 1 and 2 with the cylinder head cover removed
- FIG. 4 representation of one of the two camshafts in the removed state
- Fig. 6 is a sectional view of the cam carrier shown in Fig. 5 in the first valve lift control position
- FIG. 7 sectional view of the cam carrier shown in Fig. 5 in the second valve lift control position.
- 1 to 3 show an example of a spark-ignited four-cylinder in-line internal combustion engine with a cylinder crankcase 30, with a cylinder head 31 fastened thereon and with a cylinder head cover 33, which are constructed in a known, conventional manner.
- two intake and two exhaust valves are formed for each cylinder, the intake valves being actuated in a known manner by an intake camshaft and the exhaust valves being controlled by an exhaust camshaft 16.
- the intake camshafts and the exhaust camshaft 16 are aligned parallel to the longitudinal axis of the engine and are rotatably mounted in the cylinder head 31 on both sides of the cylinder bank.
- the exhaust camshaft 16 and the intake camshaft which consists of a basic camshaft 1 and four cam supports 2, are driven in a known manner, not shown in detail.
- FIG. 4 shows the intake camshaft, on the base camshaft 1 of which the four cam carriers 2 designed as hollow shafts are arranged axially spaced apart.
- the cam pieces 2 are axially displaceable but non-rotatably mounted on the basic camshaft 1. As shown in FIGS. 3, 4, 5, 6 and 7, at both ends of each cam carrier 2 there is a worm drive with an axial curve 10 and 11 designed as a depression, which winds helically around the cam carrier axis.
- each cam carrier 2 Two different cam raceways 6, 7 and 8, 9 being produced axially offset from the same base circle for each cam.
- the cylindrical region of the lateral surface of each cam piece 2 located between the two cams is designed as a bearing surface for a camshaft bearing 3.
- each cam carrier 2 is rotatably and axially displaceably mounted with this cylindrical bearing surface in a camshaft bearing block 3 of the cylinder head 31.
- the two end faces of the cams facing the camshaft bearing block 3 are designed as contact faces 18 and 19. Accordingly, they are the
- Cam-facing end faces of the camshaft bearing block 3 are designed as contact surfaces 17 and 20.
- the distance between the two contact surfaces 17 and 18 of the cams is greater than the distance between the contact surfaces 19 and 20 of the camshaft bearing block 3.
- the maximum distance that the contact surfaces 17 and 19, or the contact surfaces 18 and 20 from each other, corresponds to the width of the cam tracks 6, 7, 8, 9, and the distance that a cam carrier through the axial curves 10 and 11 of Worm drives can be moved.
- the gas exchange valves 27, 28 of the internal combustion engine are actuated by the cams via rocker arms 21, which are designed with a roller 23 to reduce friction.
- a lash adjuster 25 or 26 formed in the cylinder head in a conventional known manner.
- the inside of the cam carrier 2 has two mutually parallel, axially spaced, locking grooves 34, 35 which run around the entire inner circumference of the cam carrier.
- the locking grooves are approximately V-shaped, the edges of the V-shaped locking groove being rounded.
- the two locking grooves 34, 35 are formed with groove walls which run obliquely from radially outside to radially inside and which form conical surfaces 36 and 37, the conical surface 36 of the groove 34 having a pitch angle ⁇ to the axis of rotation of the camshaft 1 and the surface 37 of the groove 35 has a pitch angle ⁇ to the axis of rotation of the camshaft 1.
- a locking ball 40 of a known type is slidably mounted in a blind bore 38 formed in the radial direction.
- the locking ball 40 is biased via a spiral compression spring 39, which is supported at one end in the bottom of the blind bore 38 designed as a counter bearing and which is supported at the other end on the ball 40, in such a way that the locking ball 40 radially outwards against the radial inner surface of the cam carrier 2 biased against this.
- the distance between the conical surfaces 36 and 37 of the two grooves 34 and 35 to one another and the axial position of the blind bore 38 are matched to one another in such a way that when the contact surface 18 of the cam 8 bears against the contact surface 20 of the bearing block 3, the locking ball 40 on the conical surface 37 abuts - as shown in Figure 7 - and that when the contact surface 19 of the cam 7 on the contact surface 17 of the cam bearing block 3, the locking Ball 40 rests on the conical surface 36 of the groove 34 - as shown in Figure 5 and Figure 6.
- Bearing block 3 is directed against the axial force acting on the contact surface 18 of the cam 8.
- the cam carrier 2 In this operating position, the cam carrier 2 is axially fixed in both directions. A different expansion of the basic camshaft compared to the cylinder head only causes a slight displacement of the contact point between the ball 40 and the conical surface 36 (first position as shown in FIG. 6) or the conical surface 37 (second position as shown in FIG. 7).
- the required axial force is also introduced into the cam carrier 2 via the ball 40 in accordance with the inclination ⁇ or ⁇ of the conical surfaces 36, 37.
- the driver pin 15 of an electric actuator 13 assigned to the axial curve 11 and arranged in the cylinder head 31 is formed by the actuator into the recess Axial curve 11 introduced.
- the rotation of the camshaft 1 moves axially to the right in FIG.
- the actuation of the electric actuators is controlled in a known, not shown manner by the engine control unit, not shown.
- angles .alpha. And .beta. are dimensioned so that, depending on the individual requirement, the required axial fixing force in the operating positions for the globe valve control is ensured and the locking connection is released after engagement of the driving pins 14 and 15 in the circumferential grooves 10 and 11 when rotating the camshaft 1 is ensured in the operating direction.
- the angles ⁇ and ⁇ are selected to be of equal size between 15 ° and 45 °, for example 30 ° each.
- the four cam carriers 2 of the camshaft 1 shown in FIGS. 3 and 4 can in this way be individually controlled by the assigned actuators 12 or
- Such a configuration of the adjustment of the lift valve control is possible both for an intake camshaft 1 that controls only intake valves and on an exhaust camshaft 16 that controls only exhaust valves. It is also possible to provide such a design on a camshaft that controls both intake valves and exhaust valves.
- Such a design of a controlled adjustment of the lift valve control is also possible on internal combustion engines with more or fewer cylinders than the four cylinders shown in the exemplary embodiment.
- Such a training of the controlled adjustment of the lift valve control is also possible on different cylinder arrangements of engines, for example in inline engines, V engines or VR or W engines.
- the stroke valve control adjustment shown is possible on both spark-ignited and self-ignited internal combustion engines.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/549,612 US7409938B2 (en) | 2003-03-21 | 2004-03-17 | Valve drive of an internal combustion engine comprising a cylinder head |
DE502004001677T DE502004001677D1 (de) | 2003-03-21 | 2004-03-17 | Ventiltrieb einer einen zylinderkopf aufweisenden brennkraftmaschine |
JP2006504711A JP4330618B2 (ja) | 2003-03-21 | 2004-03-17 | シリンダーヘッドを備えた内燃機関のバルブ機構 |
EP04721147A EP1608849B1 (de) | 2003-03-21 | 2004-03-17 | Ventiltrieb einer einen zylinderkopf aufweisenden brennkraftmaschine |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10312582.5 | 2003-03-21 | ||
DE10312582 | 2003-03-21 | ||
DE10312581.7 | 2003-03-21 | ||
DE10312581 | 2003-03-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004083611A1 true WO2004083611A1 (de) | 2004-09-30 |
Family
ID=32963527
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2004/002758 WO2004083611A1 (de) | 2003-03-21 | 2004-03-17 | Ventiltrieb einer einen zylinderkopf aufweisenden brennkraftmaschine |
Country Status (6)
Country | Link |
---|---|
US (1) | US7409938B2 (de) |
EP (1) | EP1608849B1 (de) |
JP (1) | JP4330618B2 (de) |
DE (2) | DE102004011586A1 (de) |
ES (1) | ES2274435T3 (de) |
WO (1) | WO2004083611A1 (de) |
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Also Published As
Publication number | Publication date |
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EP1608849A1 (de) | 2005-12-28 |
JP2006520869A (ja) | 2006-09-14 |
ES2274435T3 (es) | 2007-05-16 |
US7409938B2 (en) | 2008-08-12 |
US20070034184A1 (en) | 2007-02-15 |
DE102004011586A1 (de) | 2004-10-07 |
DE502004001677D1 (de) | 2006-11-16 |
JP4330618B2 (ja) | 2009-09-16 |
EP1608849B1 (de) | 2006-10-04 |
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