EP3336322A1 - Nockenwellen, die ein system zur phasenverschiebung umfassen - Google Patents

Nockenwellen, die ein system zur phasenverschiebung umfassen Download PDF

Info

Publication number: EP3336322A1
Authority: EP; European Patent Office
Prior art keywords: duct; lubrication; oil; control oil; phase shift
Prior art date: 2016-12-19
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

Application number

EP17200261.0A

Other languages

English (en)

French (fr)

Other versions

EP3336322B1 (de

Inventor

Fernando Almeida

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.)

Renault SAS

Original Assignee

Renault SAS

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.)

2016-12-19

Filing date

2017-11-07

Publication date

2018-06-20

2017-11-07 Application filed by Renault SAS filed Critical Renault SAS

2018-06-20 Publication of EP3336322A1 publication Critical patent/EP3336322A1/de

2019-08-21 Application granted granted Critical

2019-08-21 Publication of EP3336322B1 publication Critical patent/EP3336322B1/de

Status Active legal-status Critical Current

2037-11-07 Anticipated expiration legal-status Critical

Images

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
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
- F01M9/10—Lubrication of valve gear or auxiliaries
- F01M9/102—Lubrication of valve gear or auxiliaries of camshaft bearings
- 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
- F01L2001/0475—Hollow 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
- F01L2001/0476—Camshaft bearings
- 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
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
- F01L2001/34423—Details relating to the hydraulic feeding circuit
- 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
- F01L2810/00—Arrangements solving specific problems in relation with valve gears
- F01L2810/02—Lubrication

Definitions

the present invention relates to a camshaft for an internal combustion engine of a motor vehicle. More particularly, the invention relates to a phase shift system cooperating with the camshaft.
phase shift system acts on the camshaft according to the engine speed so as to vary the phasing (the angular position) of the camshaft relative to the crankshaft.
the phase shift systems can be used on intake camshafts as well as on exhaust camshafts.
Hydraulic phase shift systems which operate with pressurized oil are known. These systems comprise a phase shifter which consists of a rotor rotatable relative to a stator, said rotor being connected to the camshaft. Under the action of the pressurized oil, the rotor rotates and drives the camshaft in rotation.
the phase shift system further comprises a variable distribution solenoid valve for supplying the rotor with oil under pressure.
phase shifters whose pressurized oil supply is carried out in the center thereof, that is to say it comprises an oil supply duct extending along the central axis or the axis of rotation of the phase shifter.
the supply of such a phase shifter is performed on the distribution side, that is to say the motor side where are installed the pulley of the camshaft and the crankshaft.
pressurized oil supply channels are drilled through a camshaft guide end bearing to drive oil to the phase shifter.
the camshaft thus has orifices opening out of the outer surface of the camshaft facing a holding bearing.
the oil escapes from the lubrication duct, projected towards the bearing to allow lubrication of the contacts.
the pressure of the oil inside the lubrication duct is therefore impaired by said lubrication and does not allow optimal control of a phase shifter.
the invention aims to provide a phase shift system that allows a precise and optimal control of a phase shifter cooperating with a camshaft.
a Another object of the invention is to provide a phase shift system whose structure is compact and does not pose a problem of arrangement in the cylinder head.
the invention proposes a phase shift system for an internal combustion engine comprising a camshaft held by bearings comprising a lubrication duct of the contacts between the shaft and the bearings, said lubrication duct comprising an end opening into a phase shifter.
the lubrication duct surrounds a coaxial control oil duct of a phase shifter which distributes in the lubrication duct.
the distribution of the oil between the control oil line and the lubrication line in particular the quantity and the flow rate of oil passing from the control oil line to the lubrication line.
the distribution can be adjusted so as not to alter the pressure of the oil inside the control oil pipe, which allows a precise adjustment of the phase shift and therefore an optimal control of the phase shifter.
phase shift system comprising two ducts arranged one inside the other is compact and easy to mount on a cylinder head.
the invention also relates to an engine comprising two camshafts having a first camshaft cooperating with intake valves and a second camshaft cooperating with exhaust valves. According to the invention, each of these trees belongs to a corresponding phase shift system produced according to at least one of the preceding characteristics.
the invention also relates to a vehicle comprising such an engine.
a phase shift system 1 comprises a camshaft 2 composed of a hollow lubrication duct 21 and a control oil duct 22 of a phase shifter 3.
the lubrication duct 21 and the duct of control oil 22 are coaxial.
the lubrication duct 21 is rotatably mounted relative to guide bearings 4 fixed to the motor.
the lubrication duct 21 also receives six cams 8 spaced regularly. Of course, the number of cams 8 may be different in other embodiments of the invention.
the lubrication duct 21 is carried by three guide bearings including two end bearings 41, 42 and an intermediate bearing 43.
the first end bearing 41 is to the left of the figure 1 and the second end bearing 42 is to the right of the same figure.
the second end bearing 42 carries a ball bearing 45, hence the name of the end bearing 42 rolling.
the first end bearing 41 does not include any bearings, hence its name of a smooth end bearing 41.
the intermediate bearing 43 is located mid-length of the camshaft 2 to prevent bending of the latter. Of course, the number of intermediate bearings may be different depending on the structure of the camshaft 2.
the lubrication duct 21 cooperates with a hydraulic phase shifter 3 by means of a nozzle 23.
the phase shifter 3 comprises a supply duct 31 which extends along an axis of rotation R of the rotor of the phase shifter 3. Note that the axis of rotation R of the phase shifter 3 coincides with the axis of rotation of the camshaft 2.
a distribution valve 32 is connected to one end of the supply duct 31.
the distribution of the pressurized oil in the phase shifter 3 is controlled by an actuator 7 and the distribution valve 32.
the actuator comprises a movable finger 71 in translation along the axis of rotation R of the phase shifter 3. By its axial displacement, the finger 71 translates the distribution valve 32 and put it in a position for filling an oil chamber (not shown) of the phase shifter 3, which allows to operate the rotor in rotation.
the dispensing valve 32 is screwed into the nozzle 23 on the one hand and integral with the rotor of the phase shifter 3 on the other hand. Thus, when the rotor rotates, it drives the dispensing valve 32 and the lubrication duct 21 in rotation.
the rolling end bearing 42, the phase shifter 3, the distribution valve 32 and the actuator 7 are located on the right side of the figure 1 .
the pulley of the camshaft 2 is also on this side. It is for this reason that this side is also called the distribution side.
the smooth end bearing 41 is located on the other side of the camshaft, opposite the dispensing side. In general, this opposite side is adjacent to a gearbox (not shown). It is thus called the mating side according to the vocabulary used by those skilled in the art.
the lubrication duct 21 defines a lubricating chamber 25 in which is housed the control oil pipe 22.
the lubrication duct 21 further comprises an end 27 which opens into the feed duct 31 of the phase shifter.
control oil duct 22 delimits radially a central oil chamber 24 which also opens into the feed duct 31 of the phase shifter 3.
External and internal orifices are respectively made along the lubrication duct 22 and the control oil duct 21.
a pressurized oil supply member 5 is positioned at the smooth end bearing 41 to supply oil to the control oil line 22.
the pressurized oil supply member 5 is illustrated in detail in FIGS. Figures 2 and 2A . It connects a supply duct 53 to the control oil duct 22.
the supply duct 53 is integrated here in the smooth end bearing 41.
the supply duct 53 opens onto an external orifice 51 pierced in the wall of the lubrication duct 21.
the latter comprises three other external orifices (visible at Figure 2A ) which are spaced from each other.
the control oil conduit 22 includes four internal orifices 52 spaced apart from each other.
a plug 54 closes both the control oil line 22 and the lubrication line 24 at the smooth end bearing 41.
the plug 54 further comprises a passage 55 which connects the feed conduit 53 to the control oil conduit 22.
the passage 55 establishes a connection between the external orifices 51 and the internal orifices 52.
passage 55 is here a groove 56 which serves oil in all internal orifices 52 as illustrated by the arrow referenced "b" of the Figure 2A .
pressurized oil by the path represented by the arrow "a" of the Figure 2A , also enters a space e between the end bearing 41 smooth and the Lubrication conduit 21 for lubricating the contact and friction zone between these elements.
the space e is delimited by a circumferential groove 26 formed on the lubrication duct 21 and an inner face of the plain bearing 41.
the external orifices 51 are made in the circumferential groove 26.
the control oil duct 22 comprises two secondary orifices 57 which are shifted to the right of the smooth end bearing 41. These diametrically opposed secondary orifices 57 open into the lubrication chamber 25. The pressurized oil is thus brought into this lubrication chamber 25.
passages connecting the supply duct 53 and the lubrication chamber 25 are made on the plug 54.
control oil duct 22 comprises two intermediate internal orifices 62. These, like the secondary orifices 57, are diametrically opposed and open into the lubrication chamber 25.
the lubrication duct 21 comprises an external external orifice 61 opening into the contact zone e 'between the intermediate bearing 43 and the lubrication duct 21.
the pressurized oil is driven according arrows referenced "c" on the figure 3A to come lubricate the contact zone e 'between the intermediate bearing 43 and the lubrication duct 21.
the central oil chamber 24 opening into the supply duct 31 the pressurized oil is conducted inside the phase shifter 3 according to arrows referenced "d".
the arrival of the oil in the phase shifter 3 is controlled by the distribution valve 32 and by the actuator 7 so as to fill the oil chamber of the phase shifter 3 in order to rotate the camshaft 2.
the phase shifter 3 located on the opposite side, is supplied with oil under pressure.
the pressurized oil is dispensed through the lubrication conduit 25 to the plain bearings 41 and 43 to allow lubrication of the contacts.
the diameter of the control oil duct 22, the lubrication duct 21 as well as the dimension of the internal orifices 52, 62 and external ports 51, 61 are calibrated so as to maintain a necessary pressure of the oil inside the control oil duct 22, which allows optimum control of the phase shifter.
the oil pressure in the control oil pipe 22 is greater than the oil pressure in the lubrication pipe 21.

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)

EP17200261.0A 2016-12-19 2017-11-07 Nockenwellen, die ein system zur phasenverschiebung umfassen Active EP3336322B1 (de)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
FR1662798A FR3060645B1 (fr)	2016-12-19	2016-12-19	Arbre a cames comportant un systeme de dephasage

Publications (2)

Publication Number	Publication Date
EP3336322A1 true EP3336322A1 (de)	2018-06-20
EP3336322B1 EP3336322B1 (de)	2019-08-21

Family

ID=58455197

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP17200261.0A Active EP3336322B1 (de)	2016-12-19	2017-11-07	Nockenwellen, die ein system zur phasenverschiebung umfassen

Country Status (2)

Country	Link
EP (1)	EP3336322B1 (de)
FR (1)	FR3060645B1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
JPS60173305A (ja) *	1984-02-16	1985-09-06	Honda Motor Co Ltd	強制給油式カムシヤフト
DE4007181A1 (de) *	1990-03-07	1991-09-12	Audi Ag	Antriebsvorrichtung fuer eine nockenwelle
US6076492A (en) *	1998-03-27	2000-06-20	Yamaha Hatsudoki Kabushiki Kaisha	Cylinder head for variable valve timing
US20030154943A1 (en) *	2002-01-10	2003-08-21	Shinichi Murata	Flow path structure of hollow tube
JP2009052527A (ja) *	2007-08-29	2009-03-12	Yamaha Motor Co Ltd	４サイクル内燃機関及び車両

2016
- 2016-12-19 FR FR1662798A patent/FR3060645B1/fr not_active Expired - Fee Related
2017
- 2017-11-07 EP EP17200261.0A patent/EP3336322B1/de active Active

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
JPS60173305A (ja) *	1984-02-16	1985-09-06	Honda Motor Co Ltd	強制給油式カムシヤフト
DE4007181A1 (de) *	1990-03-07	1991-09-12	Audi Ag	Antriebsvorrichtung fuer eine nockenwelle
US6076492A (en) *	1998-03-27	2000-06-20	Yamaha Hatsudoki Kabushiki Kaisha	Cylinder head for variable valve timing
US20030154943A1 (en) *	2002-01-10	2003-08-21	Shinichi Murata	Flow path structure of hollow tube
JP2009052527A (ja) *	2007-08-29	2009-03-12	Yamaha Motor Co Ltd	４サイクル内燃機関及び車両

Also Published As

Publication number	Publication date
EP3336322B1 (de)	2019-08-21
FR3060645B1 (fr)	2018-11-30
FR3060645A1 (fr)	2018-06-22

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FR2678330A1 (fr)	1992-12-31	Dispositif pour arbre a cames comprenant au moins une came pouvant etre desactivee.
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