EP3303783B1 - Dispositif d'alimentation en lubrifiant d'un arbre à cames - Google Patents

Dispositif d'alimentation en lubrifiant d'un arbre à cames Download PDF

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Publication number
EP3303783B1
EP3303783B1 EP16734428.2A EP16734428A EP3303783B1 EP 3303783 B1 EP3303783 B1 EP 3303783B1 EP 16734428 A EP16734428 A EP 16734428A EP 3303783 B1 EP3303783 B1 EP 3303783B1
Authority
EP
European Patent Office
Prior art keywords
camshaft
lubricant
engine assembly
oil
scoop
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.)
Active
Application number
EP16734428.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3303783A1 (fr
Inventor
Frédéric JUSTET
Jean-François Moulin
Guy Eberhardt
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
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Filing date
Publication date
Application filed by Renault SAS filed Critical Renault SAS
Publication of EP3303783A1 publication Critical patent/EP3303783A1/fr
Application granted granted Critical
Publication of EP3303783B1 publication Critical patent/EP3303783B1/fr
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Classifications

    • 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
    • F01M9/06—Dip or splash lubrication
    • 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
    • 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
    • F01M9/12—Non-pressurised lubrication, or non-closed-circuit lubrication, not otherwise provided for
    • 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
    • F01M1/00—Pressure lubrication
    • F01M1/06—Lubricating systems characterised by the provision therein of crankshafts or connecting rods with lubricant passageways, e.g. bores
    • F01M2001/064—Camshaft with passageways

Definitions

  • the present invention relates to an engine assembly for a motor vehicle, comprising a camshaft and a lubricant fluid supply device.
  • a camshaft is a mechanical part used for the synchronized control of the valves.
  • camshaft It is installed on the camshaft as many cams as valves to control, and the camshaft is rotated by a drive chain so that the cams alternately actuate the opening and closing of the valves.
  • the camshaft is rotatably mounted in bearings of the engine cylinder head.
  • bearings can be, for example, bearings with ball bearings, needle bearings, hydrostatic bearings, or bearings bearing bearings.
  • a motor assembly for a motor vehicle comprising a camshaft and a device for supplying lubricating fluid, for example oil, said camshaft having on the one hand a flow path of the lubricating fluid, and on the other hand a lubricant fluid inlet supplied by said supply device and at least one radial outlet opening for expelling said lubricating fluid outside said camshaft so as to be able to lubricate said camshaft.
  • lubricating fluid for example oil
  • Said lubricant fluid inlet is formed axially in one end of said camshaft.
  • the motor assembly comprises a drive chain capable of driving the rotating camshaft, said drive chain being adapted to transport the lubricating fluid from a reservoir of lubricating fluid to the device of FIG. supply of lubricating fluid.
  • the drive chain to transport the lubricating fluid, for example the lubricant fluid accumulated in a reservoir in the lower engine, and to raise it upwards, in which the cylinder head and the engine are mounted. camshaft.
  • the lubricating fluid for example the lubricant fluid accumulated in a reservoir in the lower engine
  • camshaft in which the cylinder head and the engine are mounted.
  • the feed device may comprise a scoop having an opening for collecting said lubricating fluid transported by the drive chain and a bottom to which said lubricating fluid flows by gravity, said scoop further comprising a flow orifice in the vicinity of said bottom, and the supply device comprising a nozzle connecting the discharge orifice of the bailer to said inlet of lubricating fluid of the camshaft.
  • the lubricating fluid can be collected by a bailer, upstream of the camshaft, when the camshaft is mounted in the engine.
  • the oil flows naturally by gravity and can thus be guided, passively, to the flow path of the camshaft.
  • the diameter of the nozzle section may advantageously make it possible to control the flow of oil entering the flow path of the camshaft.
  • the nozzle may have an internal diameter of flow greater than 5 mm.
  • the nozzle may be secured to the camshaft.
  • the nozzle may be attached to the scoop.
  • the motor assembly may comprise a distribution casing, said drive chain being adapted to project, when it is driven in motion, the lubricating fluid against an inner wall of said distribution casing, said scoop. being arranged so that said lubricating fluid projected against said inner wall can flow towards the bottom.
  • the drive chain by projecting the oil against the wall of the timing case, by centrifugation of the oil accumulated between the links of the chain, makes it possible to easily supply oil to the scoop, which can thus guide the oil to the lubricant fluid inlet of the camshaft.
  • This provides a relatively simple feed device and, in particular, does not require additional equipment to the usual equipment of an internal combustion engine.
  • the scoop may be fixed to the distribution casing in a sealed manner along a border in contact with an element of the wall of the timing case.
  • the camshaft may be rotatably mounted in at least one bearing, said at least one radial opening being operated in the vicinity of said bearing or a cam of the camshaft.
  • said at least one radial opening may be formed in the camshaft so as to open into said bearing.
  • the flow path extends axially so as to be able to distribute the oil to a plurality of radial openings, in particular so that all the bearings and / or all the cams are lubricated by the oil. flowing in the flow path.
  • the motor assembly may further comprise a screw for fixing the camshaft to a wall of the motor assembly, said camshaft fixing screw being hollow and presenting a threaded rod inserted into said end of the camshaft, said fluid supply means being shaped to supply the lubricant fluid inlet through said hollow fixing screw.
  • the lubricating fluid may comprise oil.
  • the lubricating fluid may consist of oil.
  • the lubricating fluid may also be of any other type known to those skilled in the art, for example any oil-based lubricant.
  • said at least one radial opening may have a diameter of between 2 mm and 4 mm.
  • the lubrication is relatively effective for the cams and / or the bearings, while allowing a good flow of the lubricating fluid in the flow path.
  • the radial openings are dimensioned so as to allow the oil to flow to the openings farthest from the inlet, avoiding that the oil escapes largely through one or a few openings near the entrance.
  • the invention also relates to a motor vehicle comprising a motor assembly as described above.
  • a motor assembly 1 for a motor vehicle not shown, here an assembly of an internal combustion engine for a motor vehicle, comprises a camshaft 2 and a lubricant supply device 3, here a feed device 3 in oil.
  • the camshaft 2 is mounted in the cylinder head of the engine, and a plurality of cams, not shown, are mounted on the camshaft 2, so as to be actuated under the effect of the rotation of the shaft. cams 2 around its axis of rotation. The cams are adapted to alternately open and close the valves of the internal combustion engine.
  • the camshaft 2 is further secured to the cylinder head by a fixing screw 40, here a hollow fixing screw 40.
  • This fixing screw 40 has a threaded rod 41, in the form of a hollow cylinder, whose outer wall is threaded.
  • the threaded rod 41 is inserted into an end 9 of the camshaft 2.
  • the fixing screw 40 further comprises a hollow head 42 resting against a wall of the cylinder head.
  • the recess of the fixing screw 40 is made parallel to the axis of the threaded rod 41, right through the screw 40 in the direction of the threaded rod 41.
  • the fixing screw 40 is hollowed right through, so that a fluid entering the opening of the head 42 can flow into the screw 40 and exit at a free end of the threaded rod 41 .
  • the camshaft 2 is rotatably mounted in bearings 10 installed in the cylinder head of the engine.
  • the bearings 10 guide the rotation of the camshaft 2 about its axis of rotation, and reduce the friction associated with this rotation.
  • the camshaft 2 is mounted in a plurality of bearings 10, for example distributed substantially uniformly over the entire length of the camshaft 2.
  • the cams and the bearings 10 are lubricated by a lubricating fluid, in this case oil.
  • a lubricating fluid in this case oil.
  • the cams and the bearings 10 form compartments obstructing the passage of the oil in the axial direction of the camshaft 2, between the yoke and the outside of the camshaft 2.
  • the camshaft 2 comprises a flow path 5, to allow the flow of oil inside the camshaft 2, and a plurality of radial openings 7, distributed in the length of the camshaft 2, the camshaft 2, allowing the oil to be expelled outside the camshaft 2.
  • the flow path 5 is here an opening made in the length of the camshaft 2, substantially parallel to the axis of rotation of the camshaft 2. In particular, the flow path 5 is centered on the axis of rotation of the camshaft 2.
  • the flow path 5 defines a substantially cylindrical opening within the camshaft 2.
  • the flow path 5 defines a radius internal to the camshaft 2.
  • the flow path 5 extends from one end 9 of the camshaft 2, over a portion of the length of the camshaft 2.
  • the flow path 5 extends in the camshaft 2 so as to route the oil in the vicinity of all the bearings 10 and / or all the cams cooperating with the camshaft 2.
  • the flow path 5 opens only at one end 9 of the camshaft 2.
  • the camshaft 2 is opening at the end 9 in which is screwed the hollow fixing screw 40 .
  • the flow path 5 is opening axially at the end 9.
  • the camshaft 2 has radial openings 7 opening radially between the flow path 5 and the outside of the camshaft 2.
  • the radial openings 7 have a diameter of between 2 mm and 4 mm.
  • the camshaft 2 comprises radial openings 7 in diametrically opposed pairs. Indeed, these radial openings 7 are obtained by making a through hole through, in a radial direction, the camshaft 2.
  • the radial openings 7 thus allowing the oil flowing in the flow path 5 to escape from the camshaft.
  • the outside of the camshaft 2 can be lubricated.
  • the radial openings 7 are formed near the bearings 10 or cams, so as to allow the oil to lubricate them.
  • the flow path and the radial openings 7 thus make it possible to diffuse the oil towards all the cams and / or the bearings 10 in the vicinity of which radial openings 7 are formed. In this way, the lubrication of the camshaft 2 is improved.
  • the bearings 10 may, for example, be framed between two cams.
  • the camshaft 2 may comprise, in its axial direction, an alternation of bearings 15 and cams.
  • the bearings 10 are bearings 10 with ball bearings 12.
  • the bearings 10 comprise a circular ring 11 in which is inserted the camshaft 2.
  • a plurality of balls 12 are disposed in the circular ring 11, between an inner wall of the circular ring 11 and an outer wall of the camshaft 2, so that they reduce the friction produced by the rotation of the cam.
  • the bearings 10 thus guide the rotation of the camshaft 2 in the cylinder head while limiting the friction produced by this rotation.
  • the bearings 10 may according to an alternative not shown, be needle bearings.
  • the balls 12 are replaced by needles extending in a direction parallel to the axis of rotation of the camshaft 2.
  • the needle bearings have the advantage of occupying a relatively small radial thickness, but require circular rings 11 having an axial length substantially greater than a ball bearing.
  • the bearings 10 may also, according to another alternative not shown, be bearings with bearings, it is then generally rings-shaped bearings, for example copper alloy, or polymer material, lubricated and optionally fried to improve their lubrication.
  • the flow path 5 of the camshaft 2 is fed with oil by a feed device 3 comprising a scoop 20.
  • the scoop 20 has an opening 21 for collecting the oil and a bottom 22 in which the oil accumulates.
  • the scoop 20 is mounted in the engine assembly 1 so that the oil flows by gravity between the opening 21 and the bottom 22.
  • the opening 21 is disposed upstream of the bottom 22 relative to the vertical of the motor vehicle.
  • a discharge orifice 23 is formed near the bottom 22 of the scoop 20.
  • this flow orifice 23 may be made directly in the bottom of the scoop 20 so as to allow the evacuation of all the water. oil accumulated in the bottom 22.
  • the flow orifice 23 may be made on a wall of the scoop 20 close to the bottom 22, in particular at a distance sufficient to allow the evacuation of most of the water. accumulated oil in the bottom 22.
  • a nozzle 24 connects the flow orifice 23 to the oil inlet 6 of the camshaft 2.
  • the nozzle 24 is a pipe whose diameter defines the oil feed rate of the camshaft 2.
  • the nozzle 24 comprises a depressed downstream end integral in the oil inlet 6 of the camshaft and it has an internal diameter of flow of the order of 6mm. In this way, the oil can flow from the scoop 20 into the flow path 5 of the camshaft.
  • the upstream end of the nozzle 24 may be secured to the scoop 20.
  • the downstream end is then engaged in the oil inlet 6 of the camshaft, said end downstream then being surrounded by at least one lip-shaped seal.
  • the nozzle 24 may have any shape adapted to connect the flow orifice 23 to the oil inlet 6. It may for example be of bent or straight form.
  • the nozzle 24 conveys the oil into the oil inlet 6 in an axial direction of the camshaft 2.
  • the oil conveyed axially in the camshaft 2 can propagate in the d 5 flow without it being necessary to put the oil under pressure.
  • the rotation of the camshaft 2 aids the propagation of the oil in the flow path 5 and allows the oil to escape through the radial openings 7 so as to lubricate the bearings 10 and / or the cams.
  • the motor assembly also comprises a drive chain 30 which rotates the camshaft 2.
  • the drive chain 30 is protected on the one hand by a chain housing, not shown, and on the other hand by a distribution casing 31.
  • the drive chain 30 is driven by the crankshaft, not shown, in the lower engine, and rotates the camshaft 2.
  • This chain 30 is made of an assembly of links.
  • the chain 30 stores oil in the lower engine, between its links.
  • the chain can pass through a reservoir of lubricating fluid, here an oil tank installed in the bottom of the lower engine.
  • the scoop is fixed against the distribution casing 31 surrounding the drive chain 30 to form a border in contact with the wall of said housing in a substantially sealed manner to optimally collect the oil projected.
  • the oil is carried by the chain 30 between the links.
  • the chain 30 projects oil accumulated between its links, by centrifugation, against an inner wall 32 of the timing case 31.
  • the inner wall 32 on which the oil is projected by the chain 30 may be, for example, a substantially vertical wall 32, when the motor assembly 1 is mounted in a motor vehicle, or a substantially oblique wall.
  • the inner wall 32 when the motor assembly 1 is mounted in a motor vehicle allows the oil projected to flow by gravity along the wall 32, or to drip from the wall 32.
  • the scoop 20 is arranged so that its opening 21 allows recovery of the oil projected against the inner wall 32 of the timing case 31.
  • the opening 21 of the bailer is contiguous to a wall 32 of the distribution casing 31, so that the oil flowing naturally by gravity along the wall 32, or still dripping from the wall 32 , under the effect of gravity, is directed towards the bottom of the scoop 20.
  • the lubricating oil can be raised from the lower motor to the upper motor by the drive chain 30, before being projected by the chain 30 against an inner wall 32 of the distribution casing 31.
  • the projected oil then flows into the scoop 20 and goes down to the bottom 22 of the scoop 20, from where it enters the nozzle 24 towards the inlet 6 of the flow path 5 of FIG. the camshaft 2, passing through the fixing screw 40 hollow.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP16734428.2A 2015-06-08 2016-06-08 Dispositif d'alimentation en lubrifiant d'un arbre à cames Active EP3303783B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1555193A FR3037100B1 (fr) 2015-06-08 2015-06-08 Dispositif d'alimentation en lubrifiant d'un arbre a cames.
PCT/FR2016/051369 WO2016198788A1 (fr) 2015-06-08 2016-06-08 Dispositif d'alimentation en lubrifiant d'un arbre a cames

Publications (2)

Publication Number Publication Date
EP3303783A1 EP3303783A1 (fr) 2018-04-11
EP3303783B1 true EP3303783B1 (fr) 2019-08-07

Family

ID=53801053

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16734428.2A Active EP3303783B1 (fr) 2015-06-08 2016-06-08 Dispositif d'alimentation en lubrifiant d'un arbre à cames

Country Status (6)

Country Link
EP (1) EP3303783B1 (zh)
JP (1) JP6855390B2 (zh)
KR (1) KR102516048B1 (zh)
CN (1) CN107849954B (zh)
FR (1) FR3037100B1 (zh)
WO (1) WO2016198788A1 (zh)

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191505394A (en) * 1914-04-28 1915-07-15 Daimler Motoren New or Improved Lubrication System for Internal Combustion Engines.
JPS62111915U (zh) * 1985-12-28 1987-07-16
JP3503159B2 (ja) * 1993-11-17 2004-03-02 トヨタ自動車株式会社 バルブタイミング制御装置付エンジンにおけるカムシャフト
JP3511702B2 (ja) * 1994-12-19 2004-03-29 スズキ株式会社 シリンダーヘッドの冷却装置
JP2675273B2 (ja) * 1995-03-15 1997-11-12 川崎重工業株式会社 カムシャフトの給油構造
JPH10159527A (ja) * 1996-11-29 1998-06-16 Toyota Autom Loom Works Ltd パワーテイクオフ機構及びその潤滑方法
US5988129A (en) * 1998-09-21 1999-11-23 General Motors Corporation Engine lubrication system
JP2001193433A (ja) * 2000-01-05 2001-07-17 Yamaha Motor Co Ltd ２サイクルディーゼルエンジン
JP2001329823A (ja) * 2000-05-23 2001-11-30 Fuji Heavy Ind Ltd Ｏｈｃ型エンジンの動弁装置潤滑構造およびｏｈｃ型エンジン用カバー部材
DE10107534A1 (de) * 2001-02-17 2002-09-05 Porsche Ag Brennkraftmaschine mit einem Zylinderkurbelgehäuse
TW200617264A (en) * 2004-08-31 2006-06-01 Yamaha Motor Co Ltd Variable valve drive device, engine and motorcycle
DE102007054992B4 (de) * 2007-11-17 2020-12-17 Audi Ag Brennkraftmaschine mit einem Zylinderkopf und mit einem Schmiermittelkreislauf

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
CN107849954B (zh) 2020-07-10
JP6855390B2 (ja) 2021-04-07
JP2018524506A (ja) 2018-08-30
KR102516048B1 (ko) 2023-03-30
FR3037100B1 (fr) 2019-04-05
FR3037100A1 (fr) 2016-12-09
KR20180016540A (ko) 2018-02-14
EP3303783A1 (fr) 2018-04-11
CN107849954A (zh) 2018-03-27
WO2016198788A1 (fr) 2016-12-15

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