EP3094835A1 - Tubular camshaft forming centrifugal oil filter - Google Patents
Tubular camshaft forming centrifugal oil filterInfo
- Publication number
- EP3094835A1 EP3094835A1 EP15704041.1A EP15704041A EP3094835A1 EP 3094835 A1 EP3094835 A1 EP 3094835A1 EP 15704041 A EP15704041 A EP 15704041A EP 3094835 A1 EP3094835 A1 EP 3094835A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bore
- diameter
- shaft
- camshaft
- oil
- 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
- 239000012535 impurity Substances 0.000 claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 7
- 238000005119 centrifugation Methods 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 5
- 238000002788 crimping Methods 0.000 claims description 4
- 239000002904 solvent Substances 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims 1
- 230000000717 retained effect Effects 0.000 claims 1
- 238000002485 combustion reaction Methods 0.000 abstract 1
- 238000009987 spinning Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 38
- 238000005461 lubrication Methods 0.000 description 3
- 239000010705 motor oil Substances 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
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
- F01M9/10—Lubrication of valve gear or auxiliaries
- F01M9/105—Lubrication of valve gear or auxiliaries using distribution conduits
-
- 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
-
- 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
- F01L2810/00—Arrangements solving specific problems in relation with valve gears
- F01L2810/02—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
- F01M13/00—Crankcase ventilating or breathing
- F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
- F01M2013/0422—Separating oil and gas with a centrifuge device
Definitions
- the invention relates to a tubular shaft for a motor vehicle engine, which comprises at least one oil circulation bore of a first determined diameter, supplied with oil at a first end via an orifice. and extending substantially along the length of said shaft, and which comprises a plurality of radial ducts which are distributed along the length of the shaft, which pass through a tubular wall of the shaft, and which put in communication the inside the bore with the outside of the shaft.
- camshafts of this type are known.
- Such a camshaft conventionally has no filtration device. To filter the engine oil, it is necessary to filter the oil upstream of the camshaft.
- the different radial ducts can also be connected to various engine components to allow the lubrication of said members.
- the oil flow must be ensured by all the radial ducts.
- the invention proposes an alternative engine oil filtration device that takes advantage of the rotational movement of the camshaft during operation of the engine to filter impurities suspended in the engine oil with the aid of a well-known phenomenon of centrifugation and lubricate engine components connected to different radial ducts.
- the oil tends to exit through the outlet ports closest to the feed inlet, which can lead to a lack of lubrication of the connected members with the outlets farthest from the inlet port of the inlet. 'food.
- the diameters of the outlet orifices are therefore very small, of the order of 0.4 mm and in particular the diameters of the orifices closest to the oil supply orifice, which increases the difficulty of producing a such camshaft.
- the invention provides a camshaft of the type described above forming a centrifugal oil filter and capable of discharging oil uniformly by all the discharge orifices, said camshaft being inexpensive in manufacturing.
- uniform evacuation of the oil means that the device simultaneously allows the passage of oil through all the ports at a time.
- the invention proposes a camshaft of the type described above, characterized in that the bore is closed at a second end opposite the first end and in that the bore is provided with a retaining means. oil which, during rotation of the shaft (10), allows the uniform discharge of the oil by centrifugation by the radial ducts beyond an oil level threshold.
- the retaining means comprises a reservoir adapted to allow the retention of impurities in the bore.
- the oil discharge orifices have different diameters from one another.
- the diameters of the oil discharge holes are in the range between 1 and 5mm.
- an inlet end (28) which is arranged according to a second diameter (D28) smaller than the first diameter (D12), to allow, during the rotation of the shaft (10), to form a weir for the discharge of the oil.
- the camshaft comprises a plurality of holes which are distributed along the length of the shaft, which pass through the tubular wall of the shaft, and which each receive an attached tube whose inlet end is arranged according to the second diameter smaller than the first diameter,
- the camshaft comprises a plurality of internal bosses which project inside the bore, which each comprise a bore passing through the tubular wall of the shaft whose inlet end is arranged according to the second diameter; less than the first diameter,
- the second end of the camshaft has a bore closed by a removable plug.
- the invention also relates to a method for cleaning a tubular camshaft for a motor vehicle engine having an oil circulation bore of a first determined diameter having at a first end a feed orifice in a preferential manner. coaxial and at a second end a hole closed by a stopper, and a plurality of radial ducts distributed along the length of the shaft which pass through a tubular wall of the shaft and whose ends are arranged according to a second diameter smaller than the first diameter , characterized in that it comprises at least a first step during which the cap is removed, a second step during which the interior of the bore is cleaned, in particular using compressed air or a solvent and a third step during which the plug is replaced.
- the invention also relates to a tool for manufacturing a tubular camshaft for a motor vehicle engine of the type described above, comprising an oil circulation bore of a first determined diameter having at one end an orifice power supply coaxially preferential manner and at a second end a hole closed by a plug, a plurality of radial bores distributed along the length of the shaft which pass through a tubular wall of the shaft, and a plurality of radial tubes distributed along the length of the which are received in the bores and whose ends are arranged in a second diameter smaller than the first diameter, characterized in that it comprises:
- a biasing element for pushing at least one tube in a corresponding radial bore to a stop position against the stop member.
- the biasing element comprises at least one body from which extends a tooth of a cylindrical section of a diameter corresponding to the inside diameter of a tube and of a length greater than that of said tube, able to allow said tooth receives a tube and has a free end protruding from the tube, and the abutment member has at least one bore of a diameter corresponding to the diameter of the free end of a tooth, the element biasing being able to push the tube in a hole of the cam shaft, the tooth being adapted to be received in a bore facing the abutment member and the tube being adapted to be squeezed by crushing between the element of solicitation and the stop element,
- the stop element comprises a comb comprising as many teeth as the camshaft has bores, each tooth being of a cylindrical section of a diameter corresponding to the inside diameter of a tube and of a length greater than that of said tube adapted to allow said tooth to receive a tube and to have a free end projecting out of the tube, and the stop element has as many holes as the camshaft has holes, each piercing being a diameter corresponding to the diameter of the free end of a tooth of the comb, the comb being able to push the tubes into the bores of the cam shaft, the teeth of the comb being able to be received in the abutment element and the tubes being able to be crimped by crushing between the comb and the abutment element.
- the invention also generally relates to a method of manufacturing a tubular camshaft of the type described above comprising an oil circulation bore of a first determined diameter having at a first end a feed orifice and at a second end a hole closed by a plug, a plurality of radial bores distributed along the length of the shaft which pass through a tubular wall of the shaft, and a plurality of radial tubes distributed along the length of the shaft which are received in the bores and whose ends are arranged according to a second diameter smaller than the first diameter, using a tool of the type described above, characterized in that it comprises:
- a third crimping step during which the tubes are pushed by a biasing element in the holes until they are crushed against the stop element to be crimped into the camshaft.
- FIG. 1 is a schematic sectional view of a camshaft according to a prior art
- - Figure 2 is a schematic sectional view of a camshaft according to the invention
- FIG. 3 is an exploded perspective view of a camshaft according to the invention and a tool for the manufacture of said camshaft;
- FIG. 4 is an assembled perspective view of a camshaft according to the invention and a tool for the manufacture of said camshaft;
- FIG. 5 is an overall sectional view showing second and third stages of a method of manufacturing the camshaft for an engine according to the invention
- FIG. 6 is a detailed sectional view showing the third step of the manufacturing process of the cylinder head for an engine according to the invention.
- FIG. 1 shows a tubular camshaft 10 for a motor vehicle engine engine produced according to a state of the art.
- the shaft 10 comprises at least one bore 12 of oil circulation of a first diameter "D12" determined, which is supplied with oil at a first end 14 of the shaft 10 via a preferably coaxial feed port 16 through which oil is injected into the shaft 10.
- the oil flow "H” has been represented by arrows in FIGS. 1 and 2.
- a convergent 17 may be arranged at the inlet of the orifice 16 to channel the flow of oil "H" towards the bore 12.
- the bore 12 extends substantially along the length of the shaft 10.
- the shaft 10 comprises a plurality of radial ducts 18 which are distributed along the length of the shaft 10, which pass through a tubular wall 20 of the shaft 10, and which put the interior of the bore 12 into communication with the outside of the shaft 10.
- a conventional solution is to filter the oil upstream of the camshaft 10, but this solution remains expensive.
- the invention proposes to take advantage of the rotational movement of the camshaft 10 to provide a camshaft whose oil is filtered by centrifugation.
- the invention provides a camshaft 10 of the type described above characterized in that the bore 10 is closed at a second end 26 opposite the first end 14 and in that each radial duct 18 has inside the bore 12 an inlet end 28 which is arranged according to a second diameter "D 2 8" smaller than the first diameter "D12", to allow, during the rotation of the shaft 10, to form a weir capable of allowing the evacuation of the oil "H” by centrifugation and the retention of impurities in the bore 12.
- the rotation of the shaft 10 makes it possible to subject the impurities 22 to a centrifugal force which plates them against the inner wall 20 of the bore 12.
- This wall arranged according to the diameter "D12" is arranged behind the end 28 of the ducts 18, so that the impurities 24 can not enter the ducts 18.
- the bore 12 of the shaft 10 fills with oil "H” until the level of the oil film on the inner wall of the bore 12 reaches the diameter "D 28 ".
- the surplus oil “H” is then discharged through the ducts 18 while the impurities 24 are confined against the inner wall of the bore 12.
- the diameters of said discharge holes may be independent of one another: the oil "H" surplus beyond the threshold defined by the differences between the diameter of the inner wall of the bore and the second diameter "D28", passes over the inlet end 28 of the ducts to be uniformly discharged and lubricate the organs connected to said ducts. It is not necessary either to opt for very small diameters of the discharge holes, nor to make diameters dependent on one another to regulate the evacuation of the oil.
- any embodiment of the ducts 18 adapted to provide an end 28 of the ducts 18 arranged according to the diameter "D 2 8" may be suitable for the proper implementation of the invention.
- camshaft 10 could, as illustrated in FIG. 2, have a plurality of internal bosses 30 that project inside the bore 12, each having a bore 32 passing through the tubular wall 20 of the housing. shaft to form the ducts 18 and of which the inlet end 28 is arranged in the second diameter "D 2 8" than the first diameter "Dis”.
- the camshaft 10 has a plurality of holes 32 which are distributed along the length of the shaft 10, which pass through the tubular wall 10 of the tree, and which each receive a tube 34 reported which the inlet end 28 is arranged in the second diameter "D 2 8" than the first diameter "Dis”.
- any means for closing the bore 12 may be suitable for the implementation of the invention.
- the bore 12 could be blind.
- the second end 26 of the camshaft comprises a bore 36 closed by a removable cap 38, as shown in Figure 2.
- the bore 36 can be confused with the diameter of the bore 12.
- This configuration makes it possible to determine a method of cleaning such a tubular camshaft 10 in order to eliminate the impurities that would have been deposited therein.
- this cleaning method comprises at least a first step during which the stopper 38 is removed, a second step during which the interior of the bore 12 is cleaned, and a third step during of which we replace the cap 38.
- a shaft 10 comprising ducts 18 constituted in part by tubes 34 requires a crimping of the tubes 34 in the holes 32 to ensure that the end 28 of said tubes 34 is well arranged according to the diameter "D 2 8" -
- such a method comprises a first step of introducing an abutment element 40 inside the bore 12, then a second step of introducing the tubes 34 in the holes 32 externally to the camshaft 10, and finally a third crimping step during which the tubes 34 are repulsed by an element 42 in the holes 32 to be crushed against the stop member 40 to be crimped in the camshaft 10.
- This tool comprises, as has been seen, a stop element 40 intended to be inserted inside the bore 12 and a biasing element 42 intended to push at least one tube 34 into a corresponding radial bore 32 up to a stop position against the abutment member 40.
- the biasing element 42 comprises at least one body 44 from which extends a tooth 46 of a cylindrical section with a diameter corresponding to the inside diameter of a tube 34 and a length greater than that of said tube 34, adapted to allow said tooth 46 to receive a tube 34 and to have a free end 48 projecting out of the tube, as shown more particularly in Figure 6.
- the stop element 40 comprises at least one hole 50 of a diameter corresponding to the diameter of the free end of a tooth 46,
- the biasing element 42 can push the tube 34 into a hole 32 of the cam shaft, then the tooth 46 is in a hole 50 of the abutment member 40 arranged opposite the bore 32. In FIG. continuing the bias, the tube 34 is crimped between the biasing element 42 and the abutment member 40.
- the tooling could make it possible to carry out in one pass all the crimps of the camshaft 10.
- the biasing element could comprise a comb comprising as many teeth 46 as the camshaft has holes 32, each tooth 46 being of a cylindrical section of a diameter corresponding to the internal diameter of a tube 34 and of a length greater than that of said tube 34 adapted to allow said tooth 46 to receive a tube 46 and to have a free end 48 projecting from the tube 34.
- the stop element 40 would then have as many holes 50 as the camshaft 10 has holes 32, each hole 50 being of a diameter corresponding to the diameter of the free end 48 of a tooth 46 of the comb.
- the comb would be able to simultaneously push all the tubes 34 in the holes 32 of the camshaft 10, then the teeth 48 of the comb would be received in the abutment member 40 and the tubes 34 would be crimped between the comb and the abutment member 40.
- the invention thus makes it possible to propose a camshaft 10 forming a centrifugal oil filter and a method of simple and economical manufacture of said camshaft 10.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1450336A FR3016394B1 (en) | 2014-01-16 | 2014-01-16 | "TUBULAR CAM SHAFT FORMING CENTRIFUGAL OIL FILTER" |
PCT/FR2015/050065 WO2015107292A1 (en) | 2014-01-16 | 2015-01-13 | Tubular camshaft forming centrifugal oil filter |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3094835A1 true EP3094835A1 (en) | 2016-11-23 |
EP3094835B1 EP3094835B1 (en) | 2019-08-28 |
Family
ID=50489314
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15704041.1A Active EP3094835B1 (en) | 2014-01-16 | 2015-01-13 | Tubular camshaft forming a centrifugal oil filter |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3094835B1 (en) |
FR (1) | FR3016394B1 (en) |
WO (1) | WO2015107292A1 (en) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6073005A (en) | 1983-09-28 | 1985-04-25 | Nippon Piston Ring Co Ltd | Cam shaft with lubricating oil supplying function |
JPS61175213A (en) * | 1985-01-30 | 1986-08-06 | Honda Motor Co Ltd | Breather device in cam casing in engine |
JPS62203909A (en) * | 1986-03-01 | 1987-09-08 | Nippon Piston Ring Co Ltd | Hollow cam shaft |
DE102007054992B4 (en) * | 2007-11-17 | 2020-12-17 | Audi Ag | Internal combustion engine with a cylinder head and with a lubricant circuit |
DE102010019131A1 (en) * | 2010-04-30 | 2011-11-03 | Mahle International Gmbh | Internal-combustion engine has hollow cam shaft mounted in cylinder head for driving inlet valve or outlet valve through valve gear |
JP5703615B2 (en) * | 2010-07-13 | 2015-04-22 | トヨタ自動車株式会社 | Oil deterioration prevention device for internal combustion engine |
-
2014
- 2014-01-16 FR FR1450336A patent/FR3016394B1/en not_active Expired - Fee Related
-
2015
- 2015-01-13 WO PCT/FR2015/050065 patent/WO2015107292A1/en active Application Filing
- 2015-01-13 EP EP15704041.1A patent/EP3094835B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
FR3016394A1 (en) | 2015-07-17 |
WO2015107292A1 (en) | 2015-07-23 |
FR3016394B1 (en) | 2016-01-01 |
EP3094835B1 (en) | 2019-08-28 |
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