EP3824165A1 - Variable ventiltriebvorrichtung - Google Patents
Variable ventiltriebvorrichtungInfo
- Publication number
- EP3824165A1 EP3824165A1 EP19745032.3A EP19745032A EP3824165A1 EP 3824165 A1 EP3824165 A1 EP 3824165A1 EP 19745032 A EP19745032 A EP 19745032A EP 3824165 A1 EP3824165 A1 EP 3824165A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cam element
- camshaft
- axis
- ramp surface
- drive device
- 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
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
- 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
-
- 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
-
- 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
-
- 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
-
- 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
- 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
- F01L13/0057—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 splittable or deformable cams
-
- 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
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/181—Centre pivot rocking arms
-
- 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
- F01L2001/0471—Assembled camshafts
- F01L2001/0473—Composite camshafts, e.g. with cams or cam sleeve being able to move relative to the inner camshaft or a cam adjusting rod
-
- 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
- F01L2250/00—Camshaft drives characterised by their transmission means
- F01L2250/02—Camshaft drives characterised by their transmission means the camshaft being driven by chains
-
- 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
Definitions
- the invention relates to a variable valve drive device for actuating at least one gas exchange valve of an internal combustion engine, with a camshaft rotatably mounted about an axis of rotation with at least one cam element adjustable via an adjusting device, the cam element being pivotable about at least between a folded-in first position and a folded-out second position
- a pivot axis is mounted, which runs parallel to the axis of rotation and is arranged at a first distance therefrom on the camshaft, and wherein the adjustable cam element is arranged adjacent in the direction of the axis of rotation of the camshaft to at least one base cam rigidly connected to the camshaft.
- the adjusting device has at least one push rod arranged displaceably within the camshaft between at least a first push position and a second push position, wherein the push rod has at least one preferably parallel z has a stop surface for the cam element and at least one ramp surface inclined to the axis of rotation of the camshaft.
- valve lift is less than at high loads, so as not to adversely affect the combustion processes in the individual cylinders.
- Various solutions for variable valve trains are therefore known in the prior art in order to provide corresponding influencing options.
- WO 95/16852 A1 describes a solution to use a push rod which is axially displaceable in a hollow camshaft in order to extend a cam element from a first position to a second position in order to vary the valve lift curve.
- the push rod has a ramp on its outer surface which acts on a ball which is arranged in a radial bore of the camshaft and which contacts an inner surface of the rotatably mounted cam element.
- the ball is moved in the radial bore and the cam element is thus pivoted from a first position into a second position.
- EP 3 045 690 A2 describes a variable valve actuation device with a camshaft, on which pivotable cam elements are arranged between two positions.
- Each pivotable cam element is actuated by means of a piston element which is displaceably mounted within the camshaft in the direction of the axis of rotation of the camshaft and which can be deflected hydraulically against a return spring in a guide sleeve arranged inside the camshaft.
- the piston element has a ramp on the lateral surface which cooperates with a retaining pin which can be displaced transversely to the piston element in a radial bore of the camshaft.
- the cam element can be fixed using a fixing device.
- the fixing device has at least one locking pin that can be actuated hydraulically against a return spring, which is displaceably mounted in a guide cylinder arranged eccentrically in the camshaft and engages in a locking division in a pin hole of the cam element.
- a cam element which is pivotably mounted in the camshaft by means of a push rod which is arranged displaceably in the camshaft.
- the push rod has a relatively flat ramp surface, which is formed by the jacket of a frustoconical section of the push rod.
- the cam element is rotatably mounted in an area of the cam, which area has the highest cam elevation.
- the ramp is formed by a frustoconical area of the push rod.
- the cam element can only be displaced only by half the diameter of the push rod, the ramp surface acting on a lateral edge of the cam element. A No ramp area is provided on the cam element - this can result in incorrect actuation and jamming, which has a negative impact on operational safety.
- this known valve train device is relatively susceptible to wear.
- DE 10 2016 103 233 A1 discloses a variable valve actuation device in which at least one cam element is pivotally mounted on the camshaft between a first position and a second position, an elastic element acting on the cam element in the direction of the extended second position.
- the cam element can be fixed using a fixing device.
- the fixing device has at least one locking pin that can be actuated hydraulically against a return spring, which is slidably mounted in a guide cylinder arranged eccentrically in the camshaft and engages in a locking division in a pin hole in the cam element.
- the cam element is connected to a drive element which interacts with a press part. The cam element can be moved back into the first position by the pressing part via the drive element.
- JP 2016 200053 A shows a similar valve actuation device.
- the object is achieved in that the cam element has a counter-ramp surface which interacts with the ramp surface of the push rod and is at least partially inclined to the axis of rotation of the camshaft.
- the cam element can be contacted directly with the push rod in at least one push position, so that the push rod acts directly on the cam element. No transmission elements between the push rod and the cam element are therefore necessary. This has the advantage that the overall tolerance and the operating play can be kept low. This allows a much more precise adjustment of the valve stroke. In addition, the lower Number of point or surface contacts reduces the wear of the device.
- the ramp surface is arranged on one end face of the push rod, the ramp surface preferably extending over the entire end face of the end face. This enables a relatively large adjustment range of the valve lift between the first and the second position of the cam element.
- the ramp surface has at least two areas with different angles of inclination with respect to the axis of rotation of the camshaft.
- the ramp surface is preferably spatially curved, at least in sections, and is preferably formed by a rotation surface.
- the ramp surface is formed by a conical surface.
- the ramp surface is thus preferably formed by a surface which is generated by rotating a line, for example a straight line, about an axis.
- the counter ramp surface of the cam element is advantageously spatially curved, at least in sections.
- the counter ramp surface is formed by a rotating surface, in particular a conical surface.
- the counter ramp surface of the cam element preferably has at least two sections with different inclination angles with respect to the axis of rotation of the camshaft.
- the ramp surface and / or the counter ramp surface is / are inclined at least in sections at an angle of inclination between approximately 30 ° and 60 ° to the axis of rotation of the camshaft. This makes it possible for the cam element to push the push rod back into the rest position when the adjustment is incomplete and for the cam element to return to the pivoted-in first position. Self-locking between the ramp surface and the counter ramp surface can be largely avoided.
- the cam element has a counter-stop surface which interacts with the stop surface of the push rod and is preferably cylindrical.
- the counter stop surface is preferably arranged axially adjacent to the counter ramp surface with respect to the axis of rotation of the camshaft. It is advantageous if the counter ramp surface in the cam element is formed as a chamfer around the counter stop surface. In the first position of the cam element, the counter ramp surface of the cam element rests on the ramp surface of the push rod. In the second position of the cam element, the counter abutment surface of the cam element lies on the abutment surface of the push rod.
- a restoring element which is preferably formed by a torsion spring.
- the resetting element thus pushes the cam element into its folded-in first position.
- the cam element is pressed against the restoring force of the restoring element by means of the ramp surface of the push rod in the extended second position.
- At least one limiting element which is fixedly connected to the camshaft is provided, the cam element having a limiting surface corresponding to the limiting element, the limiting surface of the cam element being in contact with the limiting element when the cam element is swung out to the maximum extent.
- the limiting element is designed, for example, as a limiting pin. The limiting element limits the deflection movement of the cam element to the outside. This helps prevent premature wear and damage.
- the cam element in the second position has the contour of at least one base cam, preferably two base cams axially adjoining the cam element on both sides - in the direction of the axis of rotation of the camshaft considered - completely covered. This makes it possible to realize completely different stroke curves with a simple structure, while the solutions from the prior art predominantly only allow the partial change of existing stroke curves.
- FIG. 1 shows a variable valve train device according to the invention in an axonometric representation
- Figure 2 shows the valve train device in an exploded view.
- 3 shows a cam element of the valve drive device in an axonometric representation
- 4 shows the valve drive device in a first position of the cam element in a sectional view
- valve drive device in a second position of the cam element in a sectional view.
- Fig. 1 shows a variable valve train device 1 for actuating at least one - not shown - gas exchange valve of an internal combustion engine.
- the valve actuation device 1 has a camshaft 2 which is rotatably mounted about an axis of rotation 2a and has at least one cam element 3 which can be adjusted via an adjusting device 20.
- the cam element 3 is pivotably mounted about a pivot axis 3a between a folded-in first position A (FIG. 4) and a folded-out second position B (FIG. 5).
- This pivot axis 3a is aligned parallel to the axis of rotation 2a of the camshaft 2 and is arranged on the camshaft 2 at a first distance a therefrom.
- the cam element 3 is pivotally mounted in the camshaft 2, the pivot axis 3a of the cam element 3 running parallel to and at a first distance a from the axis of rotation 2a of the camshaft 2.
- the adjustable cam element 3 is arranged in the direction of the axis of rotation 2a of the camshaft 2 adjacent to two base cams 4a, 4b of a cam body 4.
- the cam body 4 has a receptacle 5 in which the cam element 3 is predominantly received and into which the cam element 3 can be pivoted.
- Reference number 21 denotes a cam follower element, for example a rocker arm, which bears against the base cam 4a, 4b or the cam element 3 via a roller 22 and is deflected in accordance with the cam contour of the base cam 4a, 4b or the cam element 3.
- the cam follower element 21 acts on at least one gas exchange valve (not shown) of the internal combustion engine and controls its stroke.
- the adjusting device 20 has at least one push rod 6, which is displaceably arranged within the camshaft 2 and has a substantially cylindrical shape, the push rod 6 being between an axial first thrust position A1 and a second thrust position B1, ie parallel to the axis of rotation 2a of the camshaft 2. can be moved.
- the first thrust position A1 corresponds to the first position A of the cam element 3.
- the second thrust position B1 corresponds to the second position B of the cam element 3.
- the push rod 6 is cylindrical in the exemplary embodiment, but a prismatic or other shape is also possible ,
- the push rod 6 is coaxial with the camshaft 2 arranged - the longitudinal axis 6a of the push rod 6 thus coincides with the axis of rotation 2a of the camshaft 2.
- the push rod 6 has a stop surface 7 for the cam element 3 which is formed parallel to the axis of rotation 2a of the camshaft 2.
- the stop surface 7 is formed by the cylindrical outer surface of the push rod 6 and serves as a stop for the cam element 3 in the extended second position. The stop surface 7 thus prevents the pivoted-out cam element 3 from pivoting back from the second position B to the first position A.
- the push rod 6 has a ramp surface 8 that is inclined to the axis of rotation 2a of the camshaft 2.
- the ramp surface 8 serves to transfer the axial movement of the push rod 6 into a radial pivoting movement of the cam element 3 and to move the cam element 3 from the first position A to the second position B.
- the ramp surface 8 is arranged on a first end face 9 of the push rod 6.
- the push rod 6 is displaced by means of an actuator indicated by reference number 11 in FIGS. 1, 4 and 5 - e.g. hydraulically, pneumatically, electrically, electromagnetically or otherwise actuatable - which acts, for example, on a second end face 10 of the push rod facing away from the first end face 9.
- the ramp surface 8 extends over the entire end surface of the first end side 9 of the push rod 6.
- the ramp surface 8 is spatially curved and is formed, for example, by a rotating surface, for example a conical surface.
- the ramp surface 8 can have at least two areas 8a, 8b with different inclinations with respect to the longitudinal axis 6a of the push rod 6 or axis of rotation 2a of the camshaft 2.
- the ramp surface 8 is advantageously designed symmetrically to a longitudinal plane 6b of the push rod 6 which contains the longitudinal axis 6a of the push rod 6.
- the cam element 3 has a counter abutment surface 12 which, in the second position B of the cam element 3, rests on the abutment surface 7 of the push rod 6.
- the counter stop surface 12 is, for example - analogous to the stop surface 7 of the push rod 6 - cylindrical.
- the cam element 3 has a counter ramp surface 13, on which the ramp surface 8 of the push rod 6 acts during the adjustment from the first position A to the second position B.
- the counter ramp surface 13 is inclined in accordance with the ramp surface 8, the shape of the counter ramp surface 13 corresponding to the shape of the ramp surface 8.
- the counter ramp surface 13 - like the ramp surface 8 - can have at least two sections 13a, 13b with different inclinations, between which a continuous transition is preferably carried out.
- the angle of inclination g of the counter ramp surface 13 to the axis of rotation 2a of the camshaft 2 (shown in FIG. 5 as the angle between the axis of rotation 2a and a dash-dotted line following the counter ramp surface 13) is likewise between 30 ° and 60 °.
- the counter ramp surface 13 is arranged axially adjacent to the counter stop surface 12 and concentrically to the counter stop surface 12.
- the counter ramp surface 13 is designed as an approximately conical chamfer in the axial connection to the cylindrical counter stop surface 12.
- the conical surface of the counter ramp surface 13 and the cylindrical surface of the counter stop surface 12 therefore have the same axis 12a.
- the spatial contours of the ramp surface 8 and the counter ramp surface 13 have the advantage that the contact between the ramp surface 8 and the counter ramp surface 13 when the cam element 3 is deflected via a contact surface and not only - as with a flat ramp surface - via two contact points or contact lines. or even just one contact point.
- the inclinations of the ramp surface 8 and the corresponding counter ramp surface 13 cause them to slide smoothly on one another when the push rod 6 is moved from the first push position A1 to the second push position B1 and without snagging. Therefore, at least those areas of the ramp surface 8 and the counter ramp surface 13 that interact when the valve device 1 is used as intended are preferably designed with corresponding inclinations.
- the cam element 3 has a lifting surface 14 which, in the exemplary embodiment, is approximately symmetrical to a longitudinal plane 3b of the cam element which runs through the axis 12a of the cylindrical surface of the counterstop surface 12 or the conical surface of the counter ramp surface 13.
- the pivot axis 3a of the cam element 3 is located on one side of the longitudinal plane 3b of the cam element in the region of the lifting surface 14, in particular in a region between the lifting surface 14 and the counter ramp surface 13.
- the cam element 3 has a groove-like recess 15 with a boundary surface 16 on at least one side flank 3c, 3d - preferably on both side flanks.
- the width d of the groove-like recess 15 is at least as large as the diameter D of a limiting element 17 formed by a limiting pin, which is firmly connected to the camshaft 2.
- the limiting pin is inserted into a bore 18 of the camshaft 2 parallel to the axis of rotation 2a of the camshaft 2.
- the pivoting movement of the cam element 3 is limited by the limiting element 17, so that damage and undesired noise development are avoided.
- the cam element 3 is biased in the direction of the first position A by a return element 19 formed by a torsion spring (see FIG. 2).
- 4 shows the cam element 3 in the pivoted-in first position A caused by the restoring element 19, the push rod 6 being in the first push position A1, which corresponds to the rest position.
- the cam element 3 is pivoted out into the second position B shown in FIG. 5 by the ramp surface 8 and the counter ramp surface 13.
- the contour of the base cams 4a, 4b is completely covered by the contour of the cam element 3.
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
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ATA50612/2018A AT521559B1 (de) | 2018-07-16 | 2018-07-16 | Variable ventiltriebvorrichtung |
| PCT/AT2019/060237 WO2020014722A1 (de) | 2018-07-16 | 2019-07-16 | Variable ventiltriebvorrichtung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3824165A1 true EP3824165A1 (de) | 2021-05-26 |
| EP3824165B1 EP3824165B1 (de) | 2022-03-30 |
Family
ID=67441058
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19745032.3A Active EP3824165B1 (de) | 2018-07-16 | 2019-07-16 | Variable ventiltriebvorrichtung |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3824165B1 (de) |
| AT (1) | AT521559B1 (de) |
| WO (1) | WO2020014722A1 (de) |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR322489A (fr) * | 1902-06-25 | 1903-02-06 | Des Anciens Etablissements Panhard Et Levassor | Perfectionnement dans la construction des moteurs à explosion |
| FR569928A (fr) * | 1923-08-20 | 1924-04-19 | Dispositif de commande de cames | |
| DE69421170T2 (de) * | 1993-12-17 | 2000-07-06 | Christos Valasopoulos | Nockenspitze mit exzentrischer drehbewegung |
| US5855190A (en) * | 1996-09-24 | 1999-01-05 | Yamaha Hatsudoki Kabushiki Kaisha | Valve-actuating variable cam for engine |
| US7104229B2 (en) * | 2001-04-05 | 2006-09-12 | Stephen William Mitchell | Variable valve timing system |
| DE20320710U1 (de) * | 2002-03-28 | 2005-02-10 | Battlogg, Stefan | Vorrichtung zur Umwandlung einer Drehbewegung in eine hin- und hergehende Bewegung |
| DE10242235A1 (de) * | 2002-09-12 | 2004-03-25 | Daimlerchrysler Ag | Bremsventilsystem für eine Nockenwelle |
| JP6070730B2 (ja) * | 2015-01-15 | 2017-02-01 | トヨタ自動車株式会社 | 内燃機関の可変動弁装置 |
| JP6252528B2 (ja) | 2015-03-19 | 2017-12-27 | トヨタ自動車株式会社 | 内燃機関の可変動弁装置 |
| JP6295991B2 (ja) | 2015-04-09 | 2018-03-20 | トヨタ自動車株式会社 | 内燃機関の可変動弁装置 |
-
2018
- 2018-07-16 AT ATA50612/2018A patent/AT521559B1/de active
-
2019
- 2019-07-16 EP EP19745032.3A patent/EP3824165B1/de active Active
- 2019-07-16 WO PCT/AT2019/060237 patent/WO2020014722A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| AT521559B1 (de) | 2022-08-15 |
| EP3824165B1 (de) | 2022-03-30 |
| AT521559A1 (de) | 2020-02-15 |
| WO2020014722A1 (de) | 2020-01-23 |
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