EP3121398B1 - Moteur à combustion interne - Google Patents

Moteur à combustion interne Download PDF

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Publication number
EP3121398B1
EP3121398B1 EP16180061.0A EP16180061A EP3121398B1 EP 3121398 B1 EP3121398 B1 EP 3121398B1 EP 16180061 A EP16180061 A EP 16180061A EP 3121398 B1 EP3121398 B1 EP 3121398B1
Authority
EP
European Patent Office
Prior art keywords
oil
camshaft
internal combustion
combustion engine
passage
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
EP16180061.0A
Other languages
German (de)
English (en)
Other versions
EP3121398A1 (fr
Inventor
Hirotaka Takeuchi
Toshiya Kato
Takuma Nakagawa
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.)
Toyota Industries Corp
Toyota Motor Corp
Original Assignee
Toyota Industries Corp
Toyota Motor Corp
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.)
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Publication date
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Publication of EP3121398A1 publication Critical patent/EP3121398A1/fr
Application granted granted Critical
Publication of EP3121398B1 publication Critical patent/EP3121398B1/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
    • 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
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/185—Overhead end-pivot rocking arms
    • 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
    • F01M9/10—Lubrication of valve gear or auxiliaries
    • F01M9/101—Lubrication of valve gear or auxiliaries of cam surfaces
    • 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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
    • F02B63/06—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B67/00—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for
    • F02B67/04—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus
    • 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 an internal combustion engine.
  • the cylinder head of an internal combustion engine has an oil feed passage formed therein, and oil pumped up from an oil pump is fed through the oil feed passage to parts of the internal combustion engine.
  • the cylinder head is provided with hydraulic lash adjusters. With oil fed through the oil feed passage to the lash adjusters, the clearance between the cams, provided on the camshaft, and the rocker arms is adjusted.
  • the internal combustion engine described in Japanese Patent Application Publication No. 2007-278205 is provided with a vacuum pump that generates negative pressure.
  • the vacuum pump includes a rotor that rotates integrally with the camshaft. Therefore, oil that allows smooth rotation of such a rotating body is fed to the vacuum pump through an oil feed passage formed in the cylinder head.
  • Document FR 2875538 discloses means for bleeding the oil circuit from air bubbles.
  • the internal combustion engine when restarted after having been stopped, the internal combustion engine may fail to quickly feed oil from the oil feed passage to the lash adjuster, causing malfunction of the lash adjuster.
  • the present invention provides an internal combustion engine that is provided with both a vacuum pump and a lash adjuster and yet hardly causes malfunction of the lash adjuster.
  • an internal combustion engine that has: a cylinder head; an oil pump; an oil feed passage that is provided inside the cylinder head and fed with oil pumped up from the oil pump; and a camshaft attached to the cylinder head.
  • the internal combustion engine further includes a vacuum pump, a hydraulic lash adjuster, and a branch passage.
  • the vacuum pump has a rotor that is coupled to the camshaft and rotates integrally with the camshaft, a housing that houses the rotor, and a negative-pressure chamber that is defined by the rotor and the housing and connected to the oil feed passage.
  • the vacuum pump is configured to generate negative pressure inside the negative-pressure chamber as the rotor rotates.
  • the lash adjuster is connected to the oil feed passage, and is configured to adjust a clearance between a cam, provided on the camshaft, and a rocker arm by means of oil fed from the oil feed passage.
  • the branch passage is branched from the oil feed passage and provided with an open hole open to the atmosphere at a leading end of the branch passage, and the branch passage is configured to feed oil through the open hole to the camshaft while the internal combustion engine is in operation, and to introduce air through the open hole into the vacuum pump while the internal combustion engine is stopped.
  • the oil fed to the oil feed passage passes through the branch passage and is fed through the open hole to the camshaft. Therefore, according to the above configuration, it is possible to prevent a decrease in the amount of oil remaining in the oil feed passage by reducing the amount of oil suctioned from the oil feed passage into the vacuum pump. Accordingly, oil can be quickly fed to the lash adjuster at restart of the internal combustion engine. Thus, even when both the vacuum pump and the lash adjuster are provided, malfunction of the lash adjuster hardly occurs.
  • the cylinder head may be provided with a bearing that supports the camshaft, and a cam cap may be attached to the bearing.
  • a bearing hole configured to support the camshaft may be provided by the bearing and the cam cap.
  • the open hole may be provided in the cam cap to be open toward the camshaft, and the branch passage may extend from the oil feed passage to the open hole through the inside of the bearing and the cam cap.
  • a plurality of cam caps may be attached to the cylinder head to be arrayed in an extension direction of a center axis of the camshaft, and of the plurality of cam caps, a cam cap located on the nearest side of the vacuum pump in the extension direction may be provided with the open hole.
  • a plurality of cam caps may be attached to the cylinder head to be arrayed in an extension direction of a center axis of the camshaft, and of the plurality of cam caps, a cam cap located on the nearest side of the vacuum pump in the extension direction and a plurality of cam caps close to that cam cap may be each provided with the open hole.
  • the cam cap located closest to the vacuum pump when the plurality of cam caps are arrayed in the extension direction of the center axis of the camshaft is provided with the open hole, or not only the cam cap located closest to the vacuum pump but also other cam caps close to that cam cap are each provided with the open hole. Therefore, the distance between the vacuum pump and the open hole is reduced, and the amount of oil suctioned from the oil feed passage into the vacuum pump before the vacuum pump communicates with the atmosphere can be reduced. Thus, it is possible to further prevent a decrease in the amount of oil remaining inside the oil feed passage while the internal combustion engine is stopped.
  • a cylinder head 2 of an internal combustion engine 1 is provided with a plurality of bearings 4 that support a camshaft 3.
  • the bearing 4 has a semicircular recess 5 formed therein.
  • a cam cap 6 is attached to each bearing 4.
  • Each cam cap 6 has a semicircular recess 7 formed therein that is symmetrical to the recess 5 of the bearing 4.
  • a bearing hole 8 that receives the camshaft 3 is formed by the bearing 4 and the cam cap 6.
  • the camshaft 3 is inserted through each bearing hole 8, and the camshaft 3 is rotatably supported by the bearings 4 and the cam caps 6.
  • the plurality of cam caps 6 are attached to the cylinder head 2 to be arrayed in the extension direction of the center axis of the camshaft 3.
  • the camshaft 3 has a plurality of cams 9 that rotate integrally with the camshaft 3, and a timing pulley 10 is connected to one end (right end in FIG. 1 ) of the camshaft 3.
  • a crank pulley 12 is connected to one end (right end in FIG. 1 ) of a crankshaft 11.
  • a timing belt 13 is wound around each of the pulleys 10, 12.
  • An engine-driven oil pump 14 is connected to the other end (left end in FIG. 1 ) of the crankshaft 11.
  • the oil pump 14 is driven as the crankshaft 11 rotates, and thereby pumps up oil stored in an oil pan 15 and feeds the oil to parts of the internal combustion engine 1.
  • the cylinder head 2 has an oil feed passage 16 formed therein that is fed with the oil pumped up from the oil pump 14.
  • the oil feed passage 16 has a first oil feed passage 17 that extends inside the cylinder head 2 in the axial direction of the camshaft 3 (left-right direction in FIG. 1 ), and a second oil feed passage 18 that connects the first oil feed passage 17 and an oil passage formed inside the cylinder block to each other.
  • the oil feed passage 16 is connected to the oil pump 14 through the oil passage formed inside the cylinder block.
  • the plurality of cams 9 fixed to the camshaft 3 are each in contact with a rocker arm 19.
  • the rocker arm 19 has one end portion (left end portion in FIG. 2 ) supported on an engine valve 20, and the other end portion (right end portion in FIG. 2 ) supported on a lash adjuster 21.
  • the rocker arm 19 swings with the other end portion supported on the lash adjuster 21 serving as the supporting point.
  • the lash adjuster 21 has a one-end-closed cylindrical body 25 mounted on the cylinder head 2, and a one-end-closed cylindrical plunger 26 that is inserted into the body 25 and reciprocates in the axial direction of the body 25 (upper-lower direction in FIG. 3 ).
  • a low-pressure chamber 27 is formed inside the plunger 26.
  • the low-pressure chamber 27 communicates with a feed hole 29 of the body 25 through a communication hole 28 provided in the plunger 26.
  • each lash adjuster 21 is connected to the oil feed passage 16 provided in the cylinder head 2.
  • the feed hole 29 of the body 25 is connected to the oil feed passage 16.
  • the oil feed passage 16 communicates with the low-pressure chamber 27 through the feed hole 29 and the communication hole 28, so that the oil is fed from inside the oil feed passage 16 into the low-pressure chamber 27.
  • An outflow port 30 is provided at a top part of the plunger 26.
  • the rocker arm 19 is connected to the top part of the plunger 26.
  • the outflow port 30 is covered by the rocker arm 19. Excess oil of the oil fed into the low-pressure chamber 27 leaks through the outflow port 30, and is discharged to the outside through the gap between the plunger 26 and the rocker arm 19.
  • the lash adjuster 21 is further provided with a high-pressure chamber 31 defined by a bottom part of the plunger 26 and an inner wall of the body 25.
  • a valve hole 33 that is opened and closed by a check valve 32 is formed in the bottom part of the plunger 26. When opened, the check valve 32 provides communication between the low-pressure chamber 27 and the high-pressure chamber 31, allowing the oil to flow from the low-pressure chamber 27 into the high-pressure chamber 31.
  • the high-pressure chamber 31 is provided with a spring 34 that urges in a direction in which the plunger 26 is protruded from the body 25 (upward in FIG. 3 ).
  • the other end portion of the rocker arm 19 is always urged upward by the top part of the plunger 26.
  • the one end portion of the rocker arm 19 is always urged upward by the action of the valve spring 23 of the engine valve 20.
  • the lash adjuster 21 is a hydraulic lash adjuster that adjusts the clearance between the cam 9 and the rocker arm 19 by means of the oil fed from the oil feed passage 16.
  • a vacuum pump 35 is connected to the other end of the camshaft 3.
  • the vacuum pump 35 is provided with a rotor 36 that is coupled to the camshaft 3 and rotates integrally with the camshaft 3.
  • the cylinder head 2 is provided with a rotor bearing 37 that supports the rotor 36.
  • the rotor bearing 37 has a semicircular recess 38 formed therein.
  • a rotor cap 39 is attached to the rotor bearing 37.
  • the rotor cap 39 has a semicircular recess 40 formed therein that is symmetrical to the recess 38 of the rotor bearing 37.
  • a rotor bearing hole 41 that rotatably supports the rotor 36 is formed by the rotor bearing 37 and the rotor cap 39.
  • a housing 42 of the vacuum pump 35 has a tubular shape, and has a housing part 43 and a supporting part 44 smaller in diameter than the housing part 43.
  • the housing part 43 has a substantially elliptical sectional shape, while the supporting part 44 has a circular sectional shape.
  • the supporting part 44 is provided at a position eccentric relative to the housing part 43.
  • a flange 45 with an increased diameter is provided at an end portion of the supporting part 44.
  • the flange 45 of the supporting part 44 is fixed to the rotor bearing 37 and the rotor cap 39 of the cylinder head 2.
  • the inside diameter of the supporting part 44 is substantially equal to the diameter of the rotor bearing hole 41, and when the housing 42 is attached, the supporting part 44 and the rotor bearing hole 41 communicate with each other.
  • the rotor 36 housed in the housing 42 has a columnar shape.
  • the rotor 36 has a shaft part 46 inserted into the supporting part 44 of the housing 42, and a sliding part 47 larger in diameter than the shaft part 46.
  • the length of the shaft part 46 in the axial direction is larger than the length of the supporting part 44 in the axial direction. Therefore, when the shaft part 46 is inserted into the supporting part 44, one end portion of the shaft part 46 sticks out from the supporting part 44.
  • the rotor 36 is inserted into the supporting part 44 and the rotor bearing hole 41 and rotatably supported by the supporting part 44 and the rotor bearing hole 41.
  • the sliding part 47 has a slide groove 48 extending in the radial direction.
  • a vane 49 is attached to the slide groove 48 to be slidable along the slide groove 48 in the radial direction of the rotor 36.
  • the vacuum pump 35 has a cover 50.
  • the cover 50 has substantially the same shape as the sectional shape of the housing part 43 of the housing 42, and is mounted on the housing 42 with the vane 49 and the rotor 36 housed inside the housing 42.
  • the housing part 43 has a substantially elliptical sectional shape, so that, when the rotor 36 and the vane 49 rotate inside the housing 42, the vane 49 slides inside the slide groove 48 while maintaining both ends thereof in contact with the housing part 43, and thereby varies the volumes of the spaces R1, R2, R3.
  • a suction port 51 that provides communication between the space inside the housing 42 and the space inside a brake vacuum servo device is provided at a border portion between the space R1 and the space R2 in the housing 42.
  • the space R1 and the space inside the brake vacuum servo device communicate with each other.
  • negative pressure is generated inside the space R1. Due to the negative pressure generated inside the space R1, air inside the vacuum servo device is suctioned into the space R1 through the suction port 51, and negative pressure is generated inside the vacuum servo device.
  • the housing 42 is further provided with an air discharge port 52.
  • the discharge port 52 is connected to the space R3 in the state shown in FIG. 6 .
  • the compressed air inside the space R3 is discharged through the discharge port 52.
  • the vacuum pump 35 generates negative pressure by repeatedly performing the suction stroke of suctioning air (space R1 in FIG. 6 ), the compression stroke of compressing the suctioned air (space R2 in FIG. 6 ), and the exhaust stroke of discharging the compressed air (space R3 in FIG. 6 ) by rotating the rotor 36. That is, when the vacuum pump 35 is driven, the spaces R1, R2, R3 defined by the housing part 43 of the housing 42 and the rotor 36 repeat the suction stroke, the compression stroke, and the exhaust stroke, respectively, and each become a negative-pressure chamber in which negative pressure is generated.
  • the discharge port 52 is provided with a reed valve 53.
  • the reed valve 53 is a plate-like member made of metal, for example, and closes the discharge port 52.
  • the reed valve 53 is fixed to the housing 42 through a bolt 55, with a stopper member 54 laid on the reed valve 53.
  • a part of the stopper member 54 located on the upper side in FIG. 4 extends while bending to separate from the reed valve 53.
  • the opposite part of the reed valve 53 can elastically deform toward the stopper member 54.
  • a columnar coupling 56 is coupled to the shaft part 46 of the rotor 36.
  • a rectangular protrusion 57 is formed on the shaft part 46 of the rotor 36, and a groove 58 of substantially the same shape as the protrusion 57 is formed in the coupling 56.
  • the rotor 36 and the coupling 56 are coupled to each other with the protrusion 57 formed on the shaft part 46 of the rotor 36 inserted and engaged in the groove 58 of the coupling 56.
  • the camshaft 3 is coupled to the coupling 56.
  • a rectangular projection 59 is formed on one end portion of the coupling 56.
  • a groove 60 of substantially the same shape as the projection 59 is formed on the end portion of the camshaft 3, and the coupling 56 and the camshaft 3 are coupled to each other with the projection 59 of the coupling 56 inserted and engaged in the groove 60.
  • the rotor 36 is coupled to the camshaft 3 through the coupling 56.
  • a pump oil passage 62 communicating with a negative-pressure chamber 61 is formed in the vacuum pump 35 in order to feed oil to parts on which rotating bodies, such as the vane 49 and the rotor 36, slide.
  • the negative-pressure chamber 61 refers to the spaces R1, R2, R3.
  • the pump oil passage 62 is composed of a first oil passage 63 that extends in the axial direction of the rotor 36 (left-right direction in FIG. 4 ) and is open to the slide groove 48, and a second oil passage 64 that extends from the first oil passage 63 in the radial direction of the rotor 36 (upper-lower direction in FIG. 4 ) and is open in an outer peripheral surface of the rotor 36.
  • An oil feed groove 65 extending in the axial direction of the rotor 36 is formed in the recess 40 of the rotor cap 39.
  • one end portion of the oil feed groove 65 faces the opening of the second oil passage 64 of the rotor 36, and the other end portion of the oil feed groove 65 extends further toward the camshaft 3 than the second oil passage 64.
  • An upper groove 66 that extends along the entire periphery, i.e., along the upper-half periphery of the rotor bearing hole 41, is formed in the recess 40 of the rotor cap 39. The upper groove 66 is connected to the other end portion of the oil feed groove 65.
  • the lower groove 67 is connected to the upper groove 66.
  • the lower groove 67 is connected to the pump oil passage 62 through the upper groove 66 and the oil feed groove 65.
  • an introduction passage 68 that connects the oil feed passage 16 and the lower groove 67 to each other is provided inside the rotor bearing 37.
  • the oil inside the oil feed passage 16 is fed to the oil feed groove 65 through the introduction passage 68, the lower groove 67, and the upper groove 66.
  • the rotor 36 rotates and the second oil passage 64 and the oil feed groove 65 intermittently communicate with each other.
  • the oil inside the oil feed groove 65 is fed to the pump oil passage 62.
  • the oil fed to the pump oil passage 62 flows out from the opening of the first oil passage 63 through the slide groove 48 into the negative-pressure chamber 61.
  • the gap between the vane 49 and the housing 42 and the gap between the rotor 36 and the housing 42 are lubricated.
  • the negative-pressure chamber 61 and the oil feed passage 16 are connected to each other through the pump oil passage 62, the oil feed groove 65, the upper groove 66, the lower groove 67, and the introduction passage 68.
  • the oil fed to the negative-pressure chamber 61 is discharged through the discharge port 52 along with the air inside the housing 42.
  • journal oil passages 69 that are open to the bearing holes 8 through the inside of the bearings 4 are each connected to the oil feed passage 16.
  • a cam cap 601 located furthest on the side of the vacuum pump 35 (left side in FIG. 1 ) in the extension direction of the camshaft 3 is provided, at an upper end portion thereof, with a bent part 70 that extends while bending to cover the upper side of the cam 9.
  • a cam cap oil passage 71 extending upward from the bearing hole 8 is formed inside the cam cap 6.
  • the cam cap oil passage 71 is bent at an upper end portion thereof and passes through the inside of the bent part 70, and has, at the leading end, an open hole 73 that is open in a lower surface 72 of the bent part 70 facing the camshaft 3.
  • the open hole 73 is provided to be open to the atmosphere and open toward the camshaft 3.
  • journal parts 74 of the camshaft 3 supported by the bearing holes 8 a journal part 741 supported by the cam cap 601 and the bearing 4 has a ring groove 75 formed to extend along the entire periphery.
  • the oil fed from the oil feed passage 16 to the bearing hole 8 through the journal oil passage 69 is fed to the cam cap oil passage 71 through the ring groove 75 of the journal part 741.
  • the oil inside the cam cap oil passage 71 is discharged through the open hole 73 and fed to the camshaft 3.
  • a branch passage 76 that is branched from the oil feed passage 16 and has the open hole 73 open to the atmosphere at the leading end is composed of the journal oil passage 69, the ring groove 75, and the cam cap oil passage 71.
  • the branch passage 76 extends from the oil feed passage 16 to the open hole 73 through the inside of the bearing 4 and the cam cap 601.
  • the ring groove 75 is not formed in the other journal parts 74 of the camshaft 3. While the camshaft 3 is rotating, a small amount of oil is drawn by the rotation from the journal oil passages 69 into the bearing holes 8 supporting the journal parts 74. On the other hand, while the rotation of the camshaft 3 is stopped, the openings of the journal oil passages 69 are closed by the camshaft 3.
  • the oil pump 14 is driven, so that oil is fed into the oil feed passage 16.
  • the oil inside the oil feed passage 16 is fed to parts through the passages connected to the oil feed passage 16.
  • the oil having flowed into the introduction passage 68 connected to the oil feed passage 16 flows into the pump oil passage 62 through the lower groove 67, the upper groove 66, and the oil feed groove 65, and is fed into the vacuum pump 35.
  • the oil having flowed into the journal oil passages 69 connected to the oil feed passage 16 is fed into the bearing holes 8.
  • the oil having flowed into the journal oil passage 69 is fed to the cam cap oil passage 71 through the ring groove 75 of the camshaft 3. Then, the oil is fed through the open hole 73 of the cam cap oil passage 71 to the camshaft 3.
  • the oil fed to the oil feed passage 16 passes through the branch passage 76 and is fed through the open hole 73 to the camshaft 3. Since the lash adjusters 21 are also connected to the oil feed passage 16, the oil is fed into the lash adjusters 21 through the oil feed passage 16.
  • the oil feed passage 16 and the other passages are filled with oil while the internal combustion engine 1 is in operation.
  • the branch passage 76 that is branched from the oil feed passage 16 and provided with the open hole 73 open to the atmosphere at the leading end is provided. Therefore, when oil is suctioned from the oil feed passage 16 into the vacuum pump 35, air is introduced through the open hole 73 of the branch passage 76 into the oil feed passage 16 as indicated by the dashed arrows in FIG. 8 .
  • the internal combustion engine 1 may fail to promptly feed oil to the lash adjusters 21 due to the time taken to fill the inside of the oil feed passage 16 with oil.
  • the high-pressure chamber 31 cannot be replenished with oil even when the plunger 26 protrudes to adjust the clearance between the cam 9 and the rocker arm 19, so that, when a load acts on the plunger 26 from the rocker arm 19, the plunger 26 is not retained at its position but depressed into the body 25.
  • the amount of oil suctioned into the vacuum pump 35 is reduced, and a decrease in the amount of oil remaining inside the oil feed passage 16 is prevented.
  • the inside of the oil feed passage 16 is promptly filled with oil as the oil pump 14 is driven, and the oil is quickly fed to the lash adjusters 21.
  • the lash adjusters 21 become promptly operable after start of the internal combustion engine 1.
  • the cam cap 6 (601) located furthest on the side of the vacuum pump 35 in the extension direction of the camshaft 3 is provided with the open hole 73, so that the distance between the vacuum pump 35 and the open hole 73 is reduced, and the amount of oil suctioned from the oil feed passage 16 into the vacuum pump 35 before the vacuum pump 35 communicates with the atmosphere is reduced.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Claims (4)

  1. Moteur à combustion interne comportant : une culasse (2) ; une pompe à huile (14) ; un passage d'alimentation en huile (16) qui est prévu à l'intérieur de la culasse (2) et adapté pour être alimenté avec de l'huile pompée par la pompe à huile (14) ; et un arbre à cames (3) fixé sur la culasse (2), moteur à combustion interne dans lequel
    le moteur à combustion interne (1) comporte en outre une pompe à vide (35), un dispositif de rattrapage de jeu hydraulique (21), et un passage d'embranchement (76),
    la pompe à vide (35) a un rotor (36) qui est relié à l'arbre à cames (3) et est configuré pour tourner d'un seul tenant avec l'arbre à cames (3), un logement (42) qui reçoit le rotor (36), et une chambre de dépression (61) qui est définie par le rotor (36) et le logement (42) et reliée au passage d'alimentation en huile (16), et la pompe à vide (35) est configurée pour générer une dépression à l'intérieur de la chambre de dépression (61) lorsque le rotor (36) tourne,
    le dispositif de rattrapage de jeu (21) est relié au passage d'alimentation en huile (16), et est configuré pour ajuster un jeu entre une came (9), prévue sur l'arbre à cames (3), et un culbuteur (19) au moyen d'huile délivrée par le passage d'alimentation en huile (16), et
    le passage d'embranchement (76) part du passage d'alimentation en huile (16) et est pourvu d'un trou ouvert (73) ouvert sur l'atmosphère au niveau d'une extrémité avant du passage d'embranchement (76), et le passage d'embranchement (76) est configuré pour délivrer de l'huile à travers le trou ouvert (73) à l'arbre à cames (3) alors que le moteur à combustion interne (1) est en fonctionnement, et pour introduire de l'air à travers le trou ouvert (73) dans la pompe à vide (35) alors que le moteur à combustion interne (1) est arrêté.
  2. Moteur à combustion interne selon la revendication 1, caractérisé en ce que
    la culasse (2) est pourvue d'un palier (4) qui supporte l'arbre à cames (3), et un chapeau de came (6) est fixé sur le palier (4),
    un trou de palier (8) configuré pour supporter l'arbre à cames (3) est formé par le palier (4) et le chapeau de came (6),
    le trou ouvert (73) est prévu dans le chapeau de came (6) pour être ouvert vers l'arbre à cames (3), et
    le passage d'embranchement (76) s'étend depuis le passage d'alimentation en huile (16) jusqu'au trou ouvert (73) à travers l'intérieur du palier (4) et du chapeau de came (6).
  3. Moteur à combustion interne selon la revendication 2, caractérisé en ce que
    une pluralité de chapeaux de came (6) sont fixés sur la culasse (2) pour être en rangée dans une direction d'extension d'un axe central de l'arbre à cames (3), et
    dans la pluralité de chapeaux de came (6), un chapeau de came (601) situé sur le côté le plus proche de la pompe à vide (35) dans la direction d'extension est pourvu du trou ouvert (73).
  4. Moteur à combustion interne selon la revendication 2, caractérisé en ce que
    une pluralité de chapeaux de came (6) sont fixés sur la culasse (2) pour être en rangée dans une direction d'extension d'un axe central de l'arbre à cames (3), et
    dans la pluralité de chapeaux de came (6), un chapeau de came (601) situé sur le côté le plus proche de la pompe à vide (35) dans la direction d'extension et un chapeau de came (6) près du chapeau de came (601) sont chacun pourvus du trou ouvert (73).
EP16180061.0A 2015-07-22 2016-07-19 Moteur à combustion interne Active EP3121398B1 (fr)

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JP6327281B2 (ja) 2016-03-30 2018-05-23 マツダ株式会社 エンジンのカムジャーナル潤滑油供給機構

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Publication number Priority date Publication date Assignee Title
JPS56142205U (fr) * 1980-03-26 1981-10-27
JPH087043Y2 (ja) * 1988-10-29 1996-02-28 富士重工業株式会社 ダブルオーバヘッドカム型動弁機構の潤滑装置
FR2875538B1 (fr) * 2004-09-21 2009-06-12 Renault Sas Systeme d'evacuation des bulles d'air dans les rampes d'huile pour une culasse de moteur automobile
JP3874300B2 (ja) * 2005-02-16 2007-01-31 大豊工業株式会社 ベーンポンプ
JP2007278205A (ja) 2006-04-07 2007-10-25 Toyota Motor Corp カップリングの潤滑構造
JP2008157070A (ja) * 2006-12-21 2008-07-10 Toyota Motor Corp バキュームポンプ
GB2447627B (en) * 2007-03-20 2011-05-25 Ford Global Tech Llc A check valve for a vacuum pump
JP2009121258A (ja) * 2007-11-12 2009-06-04 Mazda Motor Corp エンジンの給油構造
KR101145627B1 (ko) * 2009-12-02 2012-05-15 기아자동차주식회사 Ｇｄｉ엔진의 연료 펌프 윤활 장치
CN102725532B (zh) * 2010-01-29 2015-09-23 Ulvac机工株式会社 泵
US8307800B2 (en) * 2010-03-10 2012-11-13 GM Global Technology Operations LLC Engine having camshaft lubrication rail
JP2015034572A (ja) * 2013-08-08 2015-02-19 本田技研工業株式会社 回転体の軸受構造

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JP2017025783A (ja) 2017-02-02
JP6317297B2 (ja) 2018-04-25

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