EP1985816A1 - System for continuously varying the lift and the phase of the valves in an internal combustion engine - Google Patents
System for continuously varying the lift and the phase of the valves in an internal combustion engine Download PDFInfo
- Publication number
- EP1985816A1 EP1985816A1 EP08152053A EP08152053A EP1985816A1 EP 1985816 A1 EP1985816 A1 EP 1985816A1 EP 08152053 A EP08152053 A EP 08152053A EP 08152053 A EP08152053 A EP 08152053A EP 1985816 A1 EP1985816 A1 EP 1985816A1
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- EP
- European Patent Office
- Prior art keywords
- support
- valves
- camshaft
- rocker arm
- internal combustion
- 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.)
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Classifications
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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
- F01L13/0021—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
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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
- F01L13/0021—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
- F01L13/0026—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 by means of an eccentric
Definitions
- the present invention refers to a system for continuously varying the lift and the phase of the valves in an alternating internal combustion engine.
- cams As known, in internal combustion engines the opening and closing of the intake and discharge valves of each cylinder is commanded by special eccentrics, known as cams, normally fitted onto a so-called camshaft.
- the camshaft is actuated by the drive shaft, with respect to which it rotates at half the angular speed and to which it is connected through a chain or a belt or else, more rarely, through a cascade of gears.
- the shape of the eccentrics is a defining characteristic for the performance of an engine, since it has an influence both on the opening time, or phase, of each valve, and upon the excursion, expressed in millimetres, of the valve itself. Moreover, the shape of the eccentrics is also a defining characteristic for the noisiness of the engine, since it regulates the impact between the valves and the respective seats.
- phase variators which indeed allow the opening time of the valves themselves to be varied.
- the variation of the discharge phase allows the crossing over of valves, in other words the phase in which both the intake valves and the discharge valves are open simultaneously after the burning of the mixture, to be increased, so that the unburnt gases are expelled outside of the chamber thanks to the entry of the new mixture.
- this delicate phase a small percentage of mixture is lost, but the advantage that is obtained is a good washing of the combustion chamber that thus, at each burn, is always clean and cooled as it should be.
- valve control systems normally made separately and with different technologies, are however expensive and delicate, especially when actuated hydraulically, and therefore are only intended for use on certain high-performance vehicles.
- the purpose of the present invention is therefore to make a system that is able to simultaneously and completely mechanically vary both the lift and the phase of the valves of an internal combustion engine.
- Another purpose of the invention is to make a system for continuously varying the lift and the phase of the valves in an internal combustion engine that is quick and simple to adjust.
- valves 10 and 12 which can be for intake or else discharge, have a first embodiment of the system for continuously varying the lift and phase according to the present invention applied to them.
- Each valve 10, 12 is directly commanded by a rocker arm 14, of the so-called finger type, provided or not with a roller 16 for reducing friction.
- the clearances of each valve 10, 12 can be controlled through a hydraulic recovery mechanism 18.
- a capsule or tablet 20 ( figure 6 ) can possibly be arranged for adjusting the clearances.
- Each finger rocker arm 14 is in turn commanded by the camshaft 22 through the interposition of a second rocker arm 24, or intermediate rocker arm.
- each cam 26 actuates the relative intermediate rocker arm 24 that transmits the motion to the finger rocker arm 14 and, consequently, to the valves 10 and 12.
- the intermediate rocker arm 24 has the special characteristic of having the contact surface 28 with the roller 16 of the finger rocker arm 14 equipped with a specific profile.
- at least one portion 28a of such a contact surface 28 in other words the portion along which the motion for adjusting/varying the phase and the lift, has its centre of curvature coinciding with the rotation axis C of the camshaft 22, as can be seen in figure 2 .
- a second portion 28b, possibly not present, of the contact surface 28, on the other hand, has a different centre of curvature to the centre C. What has been stated up to now is only valid should the contact between the roller 30 of the intermediate rocker arm 24 and the relative cam 26 of the camshaft 22 take place along the base circle of the cam 26 itself. Should the second portion 28b of the contact surface 28 be present, its curvature can also not be constant.
- Each intermediate rocker arm 24 is hinged on a pin 32 supported by a support 34.
- the support 34 is hinged on the camshaft 22, with the possibility of rotating with respect to it, and it is formed of a top part 34a and a bottom part 34b, joined together by means of a plurality of screws 36.
- each roller 30 and the relative cam 26 is aided by the action of a spring 38 fixedly connected to each intermediate rocker arm 24.
- a spring 38 has a fixed reaction point on the support 34 and is housed on the support 34 itself.
- the axial check of the intermediate rocker arm 24 is thus carried out through a washer 40 and a stop ring 42 of the Seeger ® type, both applied in a position opposite that in which the spring 38 is located.
- the angular positioning of the support 34 and, consequently, of the intermediate rocker arms 24 is carried out through a control eccentric 44 fixedly connected to a drive shaft 46 supported by the structure of the head (not shown) of the engine.
- the camshaft 22 and the seats 48 of each valve 10, 12 are also supported, in a conventional manner, on the head.
- the eccentric 44 is engaged by pressure with a control roller 50 hinged onto the support 34.
- the contact between the eccentric 44 and the control roller 50 is kept constant thanks to the action of a spring 52, connected to the support 34 and having a fixed reaction point on the head of the engine or on another fixed component.
- the correct sizing of the portions 28a and 28b of each contact surface 28, as well as of the cams 26 and the relative orientation between the pairs of command and intermediate rocker arms 14, 24, shall achieve the desired relationship between the variation in lift and the variation in phase of each valve 10, 12, and without affecting the predetermined maximum and minimum lift range.
- Figures 7, 8 and 9 show a second example embodiment of the system for continuously varying the lift and the phase of the valves in an internal combustion engine according to the present invention.
- the command rocker arm 14 of each valve 10, 12 lacks the hydraulic clearance recovery mechanism 18.
- the command rocker arm 14 is thus pivoted on a pin 54, supported by the structure of the head or else by another member that is fixed with respect to the engine.
- the adjustment of the clearances can be carried out through a suitable calibrated thickness 56 ( figure 7 ) arranged between each valve 10, 12 and the relative command rocker arm 14.
- Figures 10, 11 and 12 show a third example embodiment of the system for continuously varying the lift and the phase of the valves in an internal combustion engine according to the present invention.
- the angular positioning of the support 34 and of the intermediate rocker arms 24 hinged onto it takes place through a gearwheel sector 58 applied onto the support 34 itself.
- the gearwheel sector 58 is able to operate both autonomously, and through the interposition of reducing gears.
- figures 13 to 18 show a fourth example embodiment of the system for continuously varying the lift and the phase of the valves in an internal combustion engine according to the present invention, intended in particular for being used on racing engines.
- the system illustrated in such figures is conceptually identical to the previous ones, but it is specifically designed to keep the mass to a bare minimum.
- Each valve 10 and 12 is still directly commanded by the finger rocker arm 14, in turn actuated by the intermediate rocker arm 24 that receives the motion from the camshaft 22.
- Each intermediate rocker arm 24 is thus hinged on the relative pin 32 supported by the support 34.
- each finger rocker arm 14 is hinged, at an end thereof, on a small shaft 60 fixedly connected to the head of the engine, whereas the support 34 of the intermediate rocker arms 24 is again configured in such a way as to be able to rotate about the camshaft 22.
- the support 34 is provided, in addition to the rotation seat on the camshaft 22, with a further circular surface portion or raceway 62 concentric to the rotation axis of the camshaft 22 itself.
- the support 34 can thus rotate about the camshaft 22 making the raceway 62 slide on the circular portion 44a of the control eccentric 44 that, in this example embodiment, is rigidly fixed, removably or not, onto the small pivoting shaft 60 of the command rocker arms 14. Therefore, in this particular example embodiment, the small shaft 60, free to rotate in its own support seat and with respect to the rocker arms 14, also acts as a drive shaft, thus contributing to reducing the number of components and, therefore, the mass.
- the preloading spring 52 hooked to the support 34 and connected to the structure of the head or to another fixed member, shall keep the contact between the roller 64 and the control eccentric 44 constant, thus making the adjustment of the position of the support 34 and, consequently, of the lift and phasing of the valves 10 and 12 stable.
- each cam 26 and the relative intermediate rocker arm 24 can be adjusted by the screw system 36 of the support 34 that, in this embodiment, is formed of a single piece and stays in position because it is held by the contact with the roller 64, by the contact between the raceways 62 and the raceways 44a, and with the housing on the cam axis 22.
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- 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
- The present invention refers to a system for continuously varying the lift and the phase of the valves in an alternating internal combustion engine.
- As known, in internal combustion engines the opening and closing of the intake and discharge valves of each cylinder is commanded by special eccentrics, known as cams, normally fitted onto a so-called camshaft. The camshaft is actuated by the drive shaft, with respect to which it rotates at half the angular speed and to which it is connected through a chain or a belt or else, more rarely, through a cascade of gears.
- The shape of the eccentrics is a defining characteristic for the performance of an engine, since it has an influence both on the opening time, or phase, of each valve, and upon the excursion, expressed in millimetres, of the valve itself. Moreover, the shape of the eccentrics is also a defining characteristic for the noisiness of the engine, since it regulates the impact between the valves and the respective seats.
- For the regulation of the phases of each valve known devices have therefore been made like phase variators, which indeed allow the opening time of the valves themselves to be varied. By increasing such an opening time for the valve or the intake valves of each cylinder there is greater filling of the combustion chamber, with a consequent increase in the power delivered. The variation of the discharge phase, on the other hand, allows the crossing over of valves, in other words the phase in which both the intake valves and the discharge valves are open simultaneously after the burning of the mixture, to be increased, so that the unburnt gases are expelled outside of the chamber thanks to the entry of the new mixture. In this delicate phase a small percentage of mixture is lost, but the advantage that is obtained is a good washing of the combustion chamber that thus, at each burn, is always clean and cooled as it should be.
- In order to modify the excursion of the valves , on the other hand, it is possible to foresee suitable lift variators that, usually through hydraulic actuation means, are able to increase or decrease the excursion of the valves themselves, thus allowing the power delivered by the engine to be best adjusted.
- Such valve control systems, normally made separately and with different technologies, are however expensive and delicate, especially when actuated hydraulically, and therefore are only intended for use on certain high-performance vehicles.
- The purpose of the present invention is therefore to make a system that is able to simultaneously and completely mechanically vary both the lift and the phase of the valves of an internal combustion engine.
- Another purpose of the invention is to make a system for continuously varying the lift and the phase of the valves in an internal combustion engine that is quick and simple to adjust.
- These purposes according to the present invention are accomplished by making a system for continuously varying the lift and the phase of the valves in an internal combustion engine as outlined in claim 1.
- Further characteristics of the invention are outlined by the subsequent claims.
- The characteristics and advantages of a system for continuously varying the lift and the phase of the valves in an internal combustion engine according to the present invention shall become clearer from the following description, given as a non-limiting example, referring to the attached schematic drawings, in which:
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figure 1 is a front view of a first example embodiment of the system for continuously varying the lift and the phase of the valves in an internal combustion engine according to the present invention; -
figure 2 is a side view of the system shown infigure 1 ; -
figure 3 is a rear view of the system shown infigure 1 ; -
figures 4 to 6 are perspective views of the system shown infigure 1 ; -
figure 7 is a front view of a second example embodiment of the system for continuously varying the lift and the phase of the valves in an internal combustion engine according to the present invention; -
figure 8 is a side view of the system shown infigure 7 ; -
figure 9 is a rear view of the system shown infigure 7 ; -
figure 10 is a front view of a third example embodiment of the system for continuously varying the lift and the phase of the valves in an internal combustion engine according to the present invention; -
figure 11 is a side view of the system shown infigure 10 ; -
figure 12 is a rear view of the system shown infigure 10 ; -
figure 13 is a front view of a fourth example embodiment of the system for continuously varying the lift and the phase of the valves in an internal combustion engine according to the present invention; -
figure 14 is a side view of the system shown infigure 13 ; -
figure 15 is a rear view of the system shown infigure 13 ; and -
figures 16 to 18 are perspective views of the system shown infigure 13 . - With reference to
figures 1 to 6 , a pair of valves belonging to a generic internal combustion engine (not shown) is shown, which can be equipped with one or more cylinders.Such valves - Each
valve rocker arm 14, of the so-called finger type, provided or not with aroller 16 for reducing friction. In the example embodiment illustrated, the clearances of eachvalve hydraulic recovery mechanism 18. In addition, between eachvalve figure 6 ) can possibly be arranged for adjusting the clearances. - Each
finger rocker arm 14 is in turn commanded by thecamshaft 22 through the interposition of asecond rocker arm 24, or intermediate rocker arm. In practice, eachcam 26 actuates the relativeintermediate rocker arm 24 that transmits the motion to thefinger rocker arm 14 and, consequently, to thevalves - The
intermediate rocker arm 24 has the special characteristic of having thecontact surface 28 with theroller 16 of thefinger rocker arm 14 equipped with a specific profile. In detail, at least oneportion 28a of such acontact surface 28, in other words the portion along which the motion for adjusting/varying the phase and the lift, has its centre of curvature coinciding with the rotation axis C of thecamshaft 22, as can be seen infigure 2 . Asecond portion 28b, possibly not present, of thecontact surface 28, on the other hand, has a different centre of curvature to the centre C. What has been stated up to now is only valid should the contact between theroller 30 of theintermediate rocker arm 24 and therelative cam 26 of thecamshaft 22 take place along the base circle of thecam 26 itself. Should thesecond portion 28b of thecontact surface 28 be present, its curvature can also not be constant. - Each
intermediate rocker arm 24 is hinged on apin 32 supported by asupport 34. In turn, thesupport 34 is hinged on thecamshaft 22, with the possibility of rotating with respect to it, and it is formed of atop part 34a and abottom part 34b, joined together by means of a plurality ofscrews 36. - The maintaining of the contact between each
roller 30 and therelative cam 26 is aided by the action of aspring 38 fixedly connected to eachintermediate rocker arm 24. Such aspring 38 has a fixed reaction point on thesupport 34 and is housed on thesupport 34 itself. The axial check of theintermediate rocker arm 24 is thus carried out through awasher 40 and astop ring 42 of the Seeger® type, both applied in a position opposite that in which thespring 38 is located. - The angular positioning of the
support 34 and, consequently, of theintermediate rocker arms 24 is carried out through a control eccentric 44 fixedly connected to adrive shaft 46 supported by the structure of the head (not shown) of the engine. Thecamshaft 22 and theseats 48 of eachvalve control roller 50 hinged onto thesupport 34. The contact between the eccentric 44 and thecontrol roller 50 is kept constant thanks to the action of aspring 52, connected to thesupport 34 and having a fixed reaction point on the head of the engine or on another fixed component. - Therefore, according to the position taken up by the eccentric 44 and, consequently, by the
support 34 of theintermediate rocker arms 24, it varies the relative angular position between thecamshaft 22 and theintermediate rocker arms 24 themselves. Such a variation in the angular position, during the actuation of eachvalve - In addition, again with respect to the start position, it is possible to obtain a variation of the lever arm with which the
intermediate rocker arm 24 actuates therocker arm 14 for commanding thevalves valve - The correct sizing of the
portions contact surface 28, as well as of thecams 26 and the relative orientation between the pairs of command andintermediate rocker arms valve -
Figures 7, 8 and 9 show a second example embodiment of the system for continuously varying the lift and the phase of the valves in an internal combustion engine according to the present invention. In this example embodiment, thecommand rocker arm 14 of eachvalve clearance recovery mechanism 18. Thecommand rocker arm 14 is thus pivoted on apin 54, supported by the structure of the head or else by another member that is fixed with respect to the engine. The adjustment of the clearances can be carried out through a suitable calibrated thickness 56 (figure 7 ) arranged between eachvalve command rocker arm 14. -
Figures 10, 11 and 12 , on the other hand, show a third example embodiment of the system for continuously varying the lift and the phase of the valves in an internal combustion engine according to the present invention. In this example embodiment, in which there may or may not be the hydraulicclearance recovery mechanism 18, the angular positioning of thesupport 34 and of theintermediate rocker arms 24 hinged onto it takes place through agearwheel sector 58 applied onto thesupport 34 itself. For controlling the variation system, thegearwheel sector 58 is able to operate both autonomously, and through the interposition of reducing gears. - Finally,
figures 13 to 18 show a fourth example embodiment of the system for continuously varying the lift and the phase of the valves in an internal combustion engine according to the present invention, intended in particular for being used on racing engines. The system illustrated in such figures is conceptually identical to the previous ones, but it is specifically designed to keep the mass to a bare minimum. - Each
valve finger rocker arm 14, in turn actuated by theintermediate rocker arm 24 that receives the motion from thecamshaft 22. Eachintermediate rocker arm 24 is thus hinged on therelative pin 32 supported by thesupport 34. - In this example embodiment, each
finger rocker arm 14 is hinged, at an end thereof, on asmall shaft 60 fixedly connected to the head of the engine, whereas thesupport 34 of theintermediate rocker arms 24 is again configured in such a way as to be able to rotate about thecamshaft 22. In particular, thesupport 34 is provided, in addition to the rotation seat on thecamshaft 22, with a further circular surface portion orraceway 62 concentric to the rotation axis of thecamshaft 22 itself. Thesupport 34 can thus rotate about thecamshaft 22 making theraceway 62 slide on thecircular portion 44a of the control eccentric 44 that, in this example embodiment, is rigidly fixed, removably or not, onto thesmall pivoting shaft 60 of thecommand rocker arms 14. Therefore, in this particular example embodiment, thesmall shaft 60, free to rotate in its own support seat and with respect to therocker arms 14, also acts as a drive shaft, thus contributing to reducing the number of components and, therefore, the mass. - The rotation of the
small shaft 60 pulls with it the control eccentric 44, which sets the angular position of thesupport 34 through the effect of the contact of aportion 44b thereof with a roller 64 (figure 18 ) hinged onto thesupport 34 itself. Therefore, as the angular position of the control eccentric 44 varies, thesupport 34 shall take up different positions around thecamshaft 22 taking theintermediate rocker arms 24 with it. - The preloading
spring 52, hooked to thesupport 34 and connected to the structure of the head or to another fixed member, shall keep the contact between theroller 64 and the control eccentric 44 constant, thus making the adjustment of the position of thesupport 34 and, consequently, of the lift and phasing of thevalves - The correct clearance between the base circle of each
cam 26 and the relativeintermediate rocker arm 24 can be adjusted by thescrew system 36 of thesupport 34 that, in this embodiment, is formed of a single piece and stays in position because it is held by the contact with theroller 64, by the contact between theraceways 62 and theraceways 44a, and with the housing on thecam axis 22. - The system illustrated in
figures 13 to 18 can also be made in further configurations, whilst still respecting the same operating principle. For example, theportion 44b of the control eccentric 44 could be replaced by a small gearwheel, without affecting the containment function performed by thecircular portion 44a of the control eccentric 44 itself. Such a gearwheel could engage with a toothed sector present on thesupport 34 instead of theroller 64. - It has thus been seen that the system for continuously varying the lift and the phase of the valves in an internal combustion engine according to the present invention achieves the purposes highlighted previously, being able to simultaneously and completely mechanically vary both the lift and the phase of the valves of an internal combustion engine.
- The system for continuously varying the lift and the phase of the valves in an internal combustion engine of the present invention thus conceived can in any case undergo numerous modifications and variants, all of which are covered by the same inventive concept; moreover, all of the details can be replaced by technically equivalent elements. In practice, the materials used, as well as the shapes and sizes, can be whatever according to the technical requirements.
- The scope of protection of the invention is therefore defined by the attached claims.
Claims (22)
- System for continuously varying the lift and the phase of the valves in an internal combustion engine of the type comprising at least one camshaft (22) provided with at least one pair of cams (26), at least one intake valve (10) and at least one discharge valve (12) each commanded by a rocker arm (14) provided with a roller (16), characterised in that each of said rocker arms (14) is commanded by the respective cam (26) of said camshaft (22) through the interposition of at least one intermediate rocker arm (24).
- System according to claim 1, characterised in that at least one first portion (28a) of the contact surface (28) of said intermediate rocker arm (24) with said roller (16) of each rocker arm (14) has a centre of curvature coinciding with the rotation axis (C) of said camshaft (22).
- System according to claim 2, characterised in that said contact surface (28) has at least one second portion (28b) having a different centre of curvature to said centre of curvature (C) of said at least one first portion (28a).
- System according to claim 1, characterised in that each of said intermediate rocker arms (24) is hinged on a pin (32) supported by a support (34).
- System according to claim 4, characterised in that said support (34) is hinged on said camshaft (22), with the possibility of rotating with respect to it.
- System according to claim 5, characterised in that said support (34) is formed of a top part (34a) and a bottom part (34b) joined together by means of a plurality of screws (36).
- System according to claim 4, characterised in that the maintaining of the contact between the roller (30) of each of said intermediate rocker arms (24) and the relative cam (26) is aided by the action of a spring (38) fixedly connected to each of said intermediate rocker arms (24).
- System according to claim 7, characterised in that said spring (38) has a fixed reaction point on said support (34) and is housed on said support (34).
- System according to claim 7, characterised in that the axial check of each of said intermediate rocker arms (24) is obtained through at least one washer (40) and at least one stop ring (42).
- System according to claim 9, characterised in that said at least one washer (40) and said at least one stop ring (42) are applied in a position opposite that where said spring (38) is located.
- System according to claim 4, characterised in that the angular positioning of said support (34) and of said intermediate rocker arms (24) is carried out through at least one control eccentric (44) fixedly connected to a drive shaft (46) supported by the structure of the head of said internal combustion engine.
- System according to claim 11, characterised in that said control eccentric (44) is engaged by pressure with a control roller (50) hinged on said support (34).
- System according to claim 12, characterised in that the contact between said control eccentric (44) and said control roller (50) is kept constant thanks to the action of a spring (52) connected to said support (34) and having a fixed reaction point on said head of said internal combustion engine.
- System according to claim 1, characterised in that the clearances of each of said valves (10, 12) can be controlled through a hydraulic recovery mechanism (18).
- System according to claim 14, characterised in that between each of said valves (10, 12) and the respective rocker arm (14) at least one capsule or tablet (20) is arranged to adjust the clearances.
- System according to claim 1, characterised in that the clearances of each of said valves (10, 12) can be controlled through a calibrated thickness (56) arranged between each of said valves (10, 12) and the respective rocker arm (14).
- System according to claim 4, characterised in that the angular positioning of said support (34) and of said intermediate rocker arms (24) is carried out through at least one gearwheel sector (58) applied onto said support (34).
- System according to claim 17, characterised in that said gearwheel sector (58) is able to operate through the interposition of reducing gears.
- System according to claim 4, characterised in that each of said rocker arms (14) is hinged, at an end thereof, on a small shaft (60) fixedly connected to the head of said internal combustion engine.
- System according to claim 19, characterised in that said support (34) is provided, as well as the rotation seat on said camshaft (22), with a further circular surface portion or raceway (62) concentric to the rotation axis of said camshaft (22).
- System according to claim 20, characterised in that said support (34) rotates around said camshaft (22) making said raceway (62) slide on the circular portion (44a) of a control eccentric (44) rigidly fixed on said small shaft (60).
- System according to claim 21, characterised in that the rotation of said small shaft (60) pulls said control eccentric (44) with it, which sets the angular position of said support (34) through the effect of the contact of a portion (44b) of said control eccentric (44) with a roller (64) hinged onto said support (34).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI20070443 ITMI20070443A1 (en) | 2007-03-05 | 2007-03-05 | SYSTEM FOR THE CONTINUOUS VARIATION OF THE VALVE AND STAGE OF THE VALVES IN AN INTERNAL COMBUSTION ENGINE |
Publications (1)
Publication Number | Publication Date |
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EP1985816A1 true EP1985816A1 (en) | 2008-10-29 |
Family
ID=39731488
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08152053A Withdrawn EP1985816A1 (en) | 2007-03-05 | 2008-02-28 | System for continuously varying the lift and the phase of the valves in an internal combustion engine |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1985816A1 (en) |
CN (1) | CN101260818A (en) |
IT (1) | ITMI20070443A1 (en) |
TW (1) | TW200905062A (en) |
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KR101090793B1 (en) | 2008-03-26 | 2011-12-08 | 현대자동차주식회사 | Device for opening and closing valve of valve assembly of a combustion engine as well as for adjusting stroke of valve |
CN103758598B (en) * | 2013-12-30 | 2016-05-11 | 长城汽车股份有限公司 | For the valve actuating mechanism of engine and there is its vehicle |
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DE102010048708A1 (en) * | 2010-10-19 | 2012-04-19 | Kolbenschmidt Pierburg Innovations Gmbh | Mechanically controllable valve train |
CN102678219A (en) * | 2011-03-08 | 2012-09-19 | 朱譞晟 | Fully variable valve timing and lifting mechanism for variable plane supporting body |
CN103925030B (en) * | 2013-01-15 | 2018-01-09 | 长城汽车股份有限公司 | A kind of variable valve lift driving device |
CN103925033B (en) * | 2013-01-15 | 2017-02-08 | 长城汽车股份有限公司 | Swing arm adjusting bracket |
WO2014110968A1 (en) * | 2013-01-15 | 2014-07-24 | 长城汽车股份有限公司 | Driving apparatus for variable valve lift |
CN111219223A (en) * | 2018-11-26 | 2020-06-02 | 博格华纳公司 | Electrically actuated variable camshaft timing device controller |
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DE19960742A1 (en) * | 1999-12-16 | 2001-06-21 | Iav Gmbh | Variable valve drive, preferably for combustion engine, has pressure roller rotatably mounted in swinging arm with pivot axis fixed relative to cylinder head but adjustable in position |
WO2003095805A1 (en) * | 2002-05-13 | 2003-11-20 | Thyssenkrupp Automotive Ag | Drive and displacement system for variable valve-controlled distribution |
EP1426570A2 (en) * | 2000-06-30 | 2004-06-09 | Delphi Technologies, Inc. | Low friction variable valve actuation device |
US20050241598A1 (en) * | 2004-04-28 | 2005-11-03 | Toyota Jidosha Kabushiki Kaisha | Variable valve mechanism |
DE102005053250A1 (en) * | 2004-11-30 | 2006-06-01 | Hitachi, Ltd. | Variable valve operating apparatus for internal combustion engine has contact point arranged between driven roller and rocker arm, and located in hollow space of swing arm when valve lift of engine valve is set at preset amount or more |
-
2007
- 2007-03-05 IT ITMI20070443 patent/ITMI20070443A1/en unknown
-
2008
- 2008-02-28 EP EP08152053A patent/EP1985816A1/en not_active Withdrawn
- 2008-03-03 TW TW097107263A patent/TW200905062A/en unknown
- 2008-03-05 CN CNA2008100834559A patent/CN101260818A/en active Pending
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
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GB337291A (en) * | 1929-01-15 | 1930-10-30 | Motorenfabrik Deutz Ag | Improvements in and relating to the regulation of internal combustion engines |
EP0717174A1 (en) * | 1994-12-12 | 1996-06-19 | Isuzu Motors Limited | Valve operating system for internal combustion engine |
DE19960742A1 (en) * | 1999-12-16 | 2001-06-21 | Iav Gmbh | Variable valve drive, preferably for combustion engine, has pressure roller rotatably mounted in swinging arm with pivot axis fixed relative to cylinder head but adjustable in position |
EP1426570A2 (en) * | 2000-06-30 | 2004-06-09 | Delphi Technologies, Inc. | Low friction variable valve actuation device |
WO2003095805A1 (en) * | 2002-05-13 | 2003-11-20 | Thyssenkrupp Automotive Ag | Drive and displacement system for variable valve-controlled distribution |
US20050241598A1 (en) * | 2004-04-28 | 2005-11-03 | Toyota Jidosha Kabushiki Kaisha | Variable valve mechanism |
DE102005053250A1 (en) * | 2004-11-30 | 2006-06-01 | Hitachi, Ltd. | Variable valve operating apparatus for internal combustion engine has contact point arranged between driven roller and rocker arm, and located in hollow space of swing arm when valve lift of engine valve is set at preset amount or more |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101090793B1 (en) | 2008-03-26 | 2011-12-08 | 현대자동차주식회사 | Device for opening and closing valve of valve assembly of a combustion engine as well as for adjusting stroke of valve |
CN103758598B (en) * | 2013-12-30 | 2016-05-11 | 长城汽车股份有限公司 | For the valve actuating mechanism of engine and there is its vehicle |
Also Published As
Publication number | Publication date |
---|---|
CN101260818A (en) | 2008-09-10 |
ITMI20070443A1 (en) | 2008-09-06 |
TW200905062A (en) | 2009-02-01 |
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