EP2071143B1 - Oil supply mechanism for internal combustion engine - Google Patents

Oil supply mechanism for internal combustion engine Download PDF

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Publication number
EP2071143B1
EP2071143B1 EP20080021547 EP08021547A EP2071143B1 EP 2071143 B1 EP2071143 B1 EP 2071143B1 EP 20080021547 EP20080021547 EP 20080021547 EP 08021547 A EP08021547 A EP 08021547A EP 2071143 B1 EP2071143 B1 EP 2071143B1
Authority
EP
European Patent Office
Prior art keywords
oil
opening portion
valve chamber
timing chain
supply mechanism
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.)
Not-in-force
Application number
EP20080021547
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2071143A1 (en
Inventor
Takeshi Hashimoto
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 Motor Corp
Original Assignee
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.)
Filing date
Publication date
Application filed by Toyota Motor Corp filed Critical Toyota Motor Corp
Publication of EP2071143A1 publication Critical patent/EP2071143A1/en
Application granted granted Critical
Publication of EP2071143B1 publication Critical patent/EP2071143B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F01M9/10—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
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F01M11/02—Arrangements of lubricant conduits
    • F01M2011/021—Arrangements of lubricant conduits for lubricating auxiliaries, e.g. pumps or turbo chargers

Definitions

  • This invention relates to an oil supply mechanism for an internal combustion engine, in particular, an oil supply mechanism for an internal combustion engine having an oil removing (dropping) hole that supplies oil from a valve chamber in a cylinder head to a timing chain.
  • a cylinder head is fixed to an upper portion of a cylinder block of an internal combustion engine.
  • a valve chamber that accommodates an intake camshaft and an exhaust camshaft is provided. Oil stored in an oil pan is supplied to the valve chamber via an oil pump or an oil supply passage to lubricate the intake camshaft and the exhaust camshaft.
  • a belt chain is provided at the side of the cylinder block and cylinder head.
  • the belt chain is wound around a sprocket provided at an end portion of a crankshaft, a sprocket provided at an end portion of the intake camshaft and a sprocket provided at an end portion of the exhaust camshaft. Therefore, the rotation of the crankshaft is transmitted to the intake camshaft and the exhaust camshaft.
  • the opening area of the oil removing hole is reduced, the amount of oil supplied from the valve chamber to the timing chain through the oil removing oil hole is also reduced.
  • a sufficient amount of oil to flow back to the oil pan through the oil removing hole must be secured in all operation regions, i.e., from a low engine speed to a high engine speed.
  • the present invention provides an oil supply mechanism for an internal combustion engine that prevents increase in timing chain drive loss caused by the oil supplied to the timing chain, and secures sufficient oil return.
  • the present invention provides an oil supply mechanism for an internal combustion engine that includes a cylinder head that is fixed to an upper portion of a cylinder block and has a valve chamber therein.
  • a sidewall of the cylinder head has an oil removing hole through which oil is supplied from the valve chamber to a timing chain provided on the side of the cylinder head.
  • the oil removing hole communicates with the valve chamber and the shape of the oil removing hole changes along the vertical direction and includes more than one opening portions that are formed at different positions in the vertical direction.
  • the present invention when the volume of oil supplied to the valve chamber is relatively small, i.e., for example, when the internal combustion engine is in a low or middle speed operation region, oil is supplied to the timing chain only through the lower portion of the oil removing hole, rather than through the entire oil removing hole. Accordingly, oil is prevented from being supplied to the timing chain more than necessary, and the drive loss of the timing chain is prevented from being increased. As a result, decrease in the fuel efficiency can be prevented.
  • valve chamber when a large volume of oil is supplied to the valve chamber, i.e., for example, when the internal combustion engine is in a high speed operation region, oil can return to an oil pan from the entire oil removing hole. Therefore, a large volume of oil can be returned from the oil removing hole to the oil pan while the timing chain is lubricated. Thus, efficient oil return can be secured.
  • valve chamber is prevented from being filled with the oil excessively supplied to the valve chamber. Therefore, the oil level is prevented from exceeding the opening end of the PCV passage, which communicates between the cylinder head and the intake passage, on the side of the cylinder head, and thus oil is prevented from flowing into the PCV passage 43.
  • oil can be returned to the oil pan from the entire opening portion.
  • a large volume of oil can return to the oil pan through the oil removing hole while the timing chain is lubricated.
  • efficient oil return can be secured.
  • An upper-most opening portion among the opening portions may be positioned directly above the timing chain.
  • the present invention also provides an oil supply mechanism for an internal combustion engine according to claim 7.
  • FIGs. 1 to 5 show an oil supply mechanism for an internal combustion engine according to a first embodiment of the present invention. A construction thereof will be explained first.
  • an engine 1, served as an internal combustion engine includes an cylinder block 2, a cylinder head 3 that is fixed to an upper portion of the cylinder block 2, a crank case 4 that is fixed to a lower portion of the cylinder block 2, and an oil pan 5 that is fixed to a lower portion of the crank case 4.
  • a cam housing 6 is fixed to an upper portion of the cylinder head 3. As shown in FIG 4 , an intake camshaft 7 having an intake cam 7a and an exhaust camshaft 8 having an exhaust cam 8a are rotatably supported by the cam housing 6.
  • a valve chamber 9 is provided in the cylinder head 3. As described later, oil that has been lubricated the intake camshaft 7 and the exhaust camshaft 8 falls in the valve chamber 9.
  • the bottom surface 9a of the valve chamber 9 in the cylinder head 3 extends substantially horizontally.
  • a cylinder head cover 11 is fixed to the cam housing 6 via a cylinder head cover gasket 10, and the cylinder head 3 is fixed to the cylinder block 2 via the cylinder head gasket 12.
  • a shower pipe 13 (see FIG 4 ) is provided in the cam housing 6 and the cylinder head cover 11.
  • the shower pipe 13 delivers oil by drops onto the intake camshaft 7 and the exhaust camshaft 8.
  • Cylinder bores are formed in the cylinder block 2.
  • a piston 14 (see FIG 4 ) is slidably provided in each of the cylinder bore.
  • Intake ports that communicate with an intake passage (not shown) and exhaust ports that communicate with an exhaust passage (not shown) are provided in the cylinder head 3.
  • the cylinder head 3 has an intake valve 15 that opens and closes each intake port to communicate and discommunicate between the intake pipe and the cylinder bore, and an exhaust valve 16 that opens and closes the exhaust port to communicate and discommunicate between the exhaust pipe and the cylinder bore (see FIG 4 ).
  • a rocker arm 32 is disposed between the intake valve 15 and the intake camshaft 7.
  • the rocker arm 32 swings along with the rotation of the intake camshaft 7 to open and close the intake valve 15.
  • a rocker arm (not shown) is disposed between the exhaust valve 16 and the exhaust camshaft 8.
  • the rocker arm swings along with the rotation of the exhaust camshaft 8 to open and close the exhaust valve 16.
  • a crankshaft 17 is disposed in the crank case 4.
  • a camshaft drive mechanism 18 is disposed between the crankshaft 17 and the intake camshaft 7 and exhaust camshaft 8. The rotation of the crankshaft 17 is transmitted to the intake camshaft 7 and the exhaust camshaft 8 via the camshaft drive mechanism 18, thereby driving the rotation of the intake camshaft 7 and the exhaust camshaft 8.
  • the camshaft drive mechanism 18 includes a crank sprocket 19, an intake cam sprocket 20, an exhaust cam sprocket 21 and a timing chain 22.
  • the crank sprocket 19 is connected to an axial end of the crankshaft 17.
  • the intake cam sprocket 20 is connected to an axial end of the intake camshaft 7 in the cylinder head 3.
  • the exhaust cam sprocket 21 is connected to an axial end of the exhaust camshaft 8 in the cylinder block 3.
  • the timing chain 22 is wound around the crank sprocket 19, the intake cam sprocket 20 and the exhaust cam sprocket 21, and transmits the rotation of the crank sprocket 19 to the intake cam sprocket 20 and the exhaust cam sprocket 21 to rotate them.
  • the timing chain 22 is disposed at the front surface (side surface) of the cylinder block 2, crank case 4 and cylinder head 3. Note that in this embodiment, the side at which the camshaft drive mechanism 18 is disposed is the front side of the vehicle.
  • the oil pump drive mechanism 24 that drives the rotation of the oil pump 23 using the crankshaft 17 is provided below the camshaft drive mechanism 18.
  • the oil pump drive mechanism 24 includes a crank sprocket 25, an oil pump sprocket 26 and an oil pump drive chain 27.
  • the crank sprocket 25 is connected to the crankshaft 17, and is located closer to the crank case 4 than the crank sprocket 19.
  • crank sprocket 25 is on the right side (in FIG 2 ) of the crank sprocket 19.
  • the oil pump sprocket 26 is connected to an axial end of the rotating shaft of the oil pump 23.
  • the oil pump drive chain 27 is wound around the crank sprocket 25 and the oil pump sprocket 26, and transmits the rotation of the crank sprocket 19 to the oil pump sprocket 26 to rotate it.
  • the camshaft drive mechanism 18 and the oil pump drive mechanism 24 are covered by a timing chain cover 28 from the outside and is accommodated therein.
  • the timing chain cover 28 is made of aluminum alloy and is attached on the front side of the cylinder head 3, cylinder block 2 and crank case 4, that is, attached on one side in the axial direction thereof.
  • a chain tensioner device 29 is provided between the crank sprocket 19 and the exhaust cam sprocket 21.
  • the chain tensioner device 29 adjusts the tensile force of the timing chain 22 at a portion suspended between the crank sprocket 19 and the exhaust cam sprocket 21 under tension.
  • a chain guide 30 is provided between the intake cam sprocket 20 and the crank sprocket 19.
  • the chain guide 30 slidably contacts a portion of the timing chain 22 suspended between the intake cam sprocket 20 and the crank sprocket 19 under tension to guide the timing chain 22.
  • one axial end of the crankshaft 17 protrudes outside the timing chain cover 28, and a crank pulley 31 is connected to the axial end of the crankshaft 17.
  • an oil passage (not shown) is formed in the intake camshaft 7 and the exhaust camshaft 8.
  • the oil passage extends along the axial direction of the intake camshaft 7 and the exhaust camshaft 8.
  • An oil passage is formed in the cylinder block 2 and the cylinder head 3 extending in a vertical direction. Oil pumped from the oil pan 5 by the oil pump 23 passes through the oil passage in the cylinder block 2 and the cylinder head 3 and is supplied to the oil passage in the intake camshaft 7 and the exhaust camshaft 8.
  • an opening portion 41 and an opening portion 42 which are served as oil removing holes, are formed in a sidewall 3a on the front side of the cylinder head 3.
  • the opening portion 41 and the opening portion 42 communicate with the valve chamber 9, and discharge or remove the oil dropped or fallen into the valve chamber 9 from the valve chamber 9 to supply the oil to the timing chain 22.
  • the oil returns to the oil pan 5 through the space formed between the cylinder block 2 and crank case 4 and the timing chain cover 28.
  • the bottom surface 9a of the valve chamber 9 is formed of a first bottom surface 9b and a second bottom surface 9c.
  • the second bottom surface 9c is positioned on the front side of the cylinder head 3 and is lower than the first bottom surface 9b.
  • the opening portion 41 has a circular shape and at least a portion of the first opening portion 41 is located above the first bottom surface 9b.
  • the lower end of the first opening portion 41 is below the first bottom surface 9b and above the second bottom surface 9c.
  • the opening portion 42 has a generally rectangular shape having an area larger than the opening portion 41.
  • the center portion of the opening portion 42 in the vertical direction is located at the first bottom surface 9b.
  • the lower end of the opening portion 42 is located below the second bottom surface 9c.
  • the opening portion 41 located higher than the opening portion 42 is located directly above the timing chain 22.
  • the total opening area of the first opening portion 41 and the second opening portion 42 is set such that, when the engine 1 is in a high speed operation region and oil is excessively supplied to the valve chamber 9 to lubricate the intake camshaft 7 and the exhaust camshaft 8, a sufficient amount of oil can return to the oil pan 5 without staying in the valve chamber 9.
  • PCV passage 43 An end of a blowby gas recirculation passage (hereinafter, referred to as a "PCV passage") 43 is attached at the upper portion of the cylinder head 3.
  • the other end of the PCV passage 43 is attached to an intake manifold (not shown).
  • the PCV passage 43 is known as a passage that conducts the gas blowing through the gap between the cylinder and the piston 14 of the engine 1 to the engine 1 through the intake manifold to combust the gas again.
  • oil stored in the oil pan 5 is pumped up by the oil pump 23 in the direction shown by arrows, and is supplied to components to be lubricated, such as the crankshaft 17, the piston 14, the intake camshaft 7 and the exhaust camshaft 8. Oil is also supplied to the intake cam 7a, the exhaust cam 8a and the rocker arm 32 via the shower pipe 13.
  • the oil supplied to the intake camshaft 7, exhaust camshaft 8, intake cam 7a, exhaust cam 8a and the rocker arm 32 falls on the bottom surface 9a of the valve chamber 9 and is stored in the valve chamber 9.
  • the oil discharged from the opening portion 41 and the opening portion 42 lubricates the timing chain 22, the chain tensioner device 29 and the chain guide 30, and then returns to the oil pan 5. Further, because the opening portion 42 is formed directly or immediately above the timing chain 22, the oil discharged from the opening portion 42 is supplied immediately and directly to the timing chain 22.
  • the opening portion 41 and the opening portion 42 which have opening areas different from each other, are formed as oil removing holes in the sidewall of the cylinder head 3.
  • the opening portion 41 having a smaller opening area is disposed at a higher position than the opening portion 42 having a greater opening area. Therefore, when the volume of oil supplied to the valve chamber 9 is relatively small, oil can be supplied to the timing chain 22 from the opening portion 42 positioned at a lower place.
  • the total opening area of the opening portion 41 and the opening portion 42 is set such that, when oil is excessively supplied to the valve chamber 9 to lubricate the intake camshaft 7 and the exhaust camshaft 8, a sufficient volume of oil can return to the oil pan 5 without staying in the valve chamber 9. Thus, sufficient oil return is secured.
  • valve chamber 9 is prevented from being filled with the oil excessively supplied to the valve chamber 9. Therefore, the oil level is prevented from exceeding the height (level) of the opening end of the PCV passage 43 on the side of the cylinder head 3, and oil is prevented from flowing into the PCV passage 43.
  • the opening portion 41 which is disposed at a higher position, is located directly above the timing chain 22, when a large volume of oil returns to the oil pan 5 and a large volume of oil is required to lubricate the timing chain 22, oil is effectively supplied to the timing chain 22 from the opening portion 41 to lubricate the timing chain 22.
  • valve chamber 9 is prevented from being excessively filled with oil that is excessively supplied to the valve chamber 9.
  • oil level is prevented from exceeding the opening end of the PCV passage 43, which communicates between the cylinder head 3 and the intake passage, on the side of the cylinder head, and the oil is prevented from flowing into the PCT passage.
  • the total opening area of the opening portion 41 and opening portion 42 is set such that, when the engine 1 is in a high speed operation region and the oil is excessively supplied to the valve chamber 9 to lubricates the intake camshaft 7 and the exhaust camshaft 8, the oil can return to the oil pan 5 without staying in the valve chamber 9. Accordingly, when the engine 1 is in a high speed operation region, sufficient oil return can be secured.
  • FIG 6 is an oil supply mechanism for an internal combustion engine according to a second embodiment of the present invention.
  • the elements same as those in the first embodiment are denoted by the same reference numerals, and detailed explanation thereof will be omitted.
  • an inverted triangular opening portion 51 which is served as an oil removing hole, is formed in the sidewall 3a of the cylinder head 3.
  • the opening area or shape of the opening portion 51 changes in the vertical direction.
  • the horizontal width of the opening 51 changes along its height.
  • the horizontal width of the opening 51 increases, as the position becomes higher.
  • the single opening portion 51 has an upper opening portion 51a and a lower opening portion 51b.
  • the opening area of the upper opening portion 51a is greater than the opening area of the lower opening portion 51b.
  • the lower end of the lower opening portion 51b is located below the second bottom surface 9c.
  • the upper opening portion 51a and the lower opening portion 51b are divided by the center of the opening portion 51 in the vertical direction. That is, the upper opening portion 51a is a portion located above the center of the opening portion 51 in the vertical direction, and the lower opening portion 51b is a portion located below the center of the opening portion 51 in the vertical direction.
  • the opening area of the opening portion 51 is set such that, when the engine 1 is in a high speed operation region and the oil is excessively supplied to the valve chamber 9 to lubricate the intake camshaft 7 and the exhaust camshaft 8, a sufficient volume of oil returns to the oil pan 5 without staying in the valve chamber 9.
  • the oil fallen on the bottom surface 9a moves from the first bottom surface 9b to the second bottom surface 9c and is discharged from the lower opening portion 51b.
  • the oil discharged from the lower opening portion 51b lubricates the timing chain 22, the chain tensioner device 29 and the chain guide 30, and then returns to the oil pan 5.
  • oil return efficiency is not affected.
  • the oil fallen on the bottom surface 9a is discharged from both the upper opening portion 51a and the lower opening portion 51b, i.e., from the whole area of the opening portion 51.
  • the oil discharged from the opening portion 51 lubricates the timing chain 22, the chain tensioner device 29 and the chain guide 30, and then returns to the oil pan 5.
  • a single opening portion 51 is formed as an oil removing hole in the sidewall of the cylinder head 3.
  • the opening area of the upper opening portion 51a located in a higher position is formed larger than the opening area of the lower opening portion 51b, which is located below the upper opening portion 51a. Therefore, when the volume of oil supplied to the valve chamber 9 is relatively small, the oil is supplied to the timing chain 22 only through the lower opening portion 51b.
  • the opening area of the opening portion 51 is set such that, when oil is excessively supplied to the valve chamber 9 to lubricate the intake camshaft 7 and the exhaust camshaft 8, a sufficient volume of oil can return to the oil pan 5 without staying in the valve chamber 9. Thus, sufficient oil return is secured.
  • two opening portions i.e., the opening portion 41 and the opening portion 42 are formed at the different heights.
  • a single inverted triangular opening portion 51 in which the lower opening area is smaller than the upper opening area is formed.
  • more than two opening portions may be formed.
  • the oil supply mechanism for an internal combustion engine of the present invention can prevent the drive loss of the timing chain caused by the oil supplied to the timing chain from being increased, and sufficient oil return can be secured.
  • the oil supply mechanism is useful when it is applied to an internal combustion engine having an oil removing hole to supply oil to a timing chain from a valve chamber in a cylinder head.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
EP20080021547 2007-12-12 2008-12-11 Oil supply mechanism for internal combustion engine Not-in-force EP2071143B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007321298A JP4661862B2 (ja) 2007-12-12 2007-12-12 内燃機関のオイル供給構造

Publications (2)

Publication Number Publication Date
EP2071143A1 EP2071143A1 (en) 2009-06-17
EP2071143B1 true EP2071143B1 (en) 2011-01-26

Family

ID=40340578

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20080021547 Not-in-force EP2071143B1 (en) 2007-12-12 2008-12-11 Oil supply mechanism for internal combustion engine

Country Status (3)

Country Link
EP (1) EP2071143B1 (ja)
JP (1) JP4661862B2 (ja)
DE (1) DE602008004723D1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8353268B2 (en) 2010-05-17 2013-01-15 GM Global Technology Operations LLC Oiling system for timing chains

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5348213B2 (ja) * 2011-09-05 2013-11-20 マツダ株式会社 エンジンの給油装置
JP2014095317A (ja) * 2012-11-08 2014-05-22 Toyota Motor Corp タイミングチェーンの潤滑油供給構造

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04159408A (ja) 1990-10-22 1992-06-02 Suzuki Motor Corp カムチエーンガイドの潤滑装置
JPH08135427A (ja) 1994-11-04 1996-05-28 Suzuki Motor Corp タイミングチェーンの潤滑構造
JP3348025B2 (ja) 1998-09-24 2002-11-20 ダイハツ工業株式会社 シリンダヘッドのオイル落とし構造
JP3695219B2 (ja) * 1999-05-13 2005-09-14 スズキ株式会社 船外機
JP2001012225A (ja) 1999-06-29 2001-01-16 Suzuki Motor Corp シリンダヘッドの潤滑系構造
JP3640348B2 (ja) 2001-05-17 2005-04-20 本田技研工業株式会社 シリンダヘッド構造
JP2004204732A (ja) 2002-12-24 2004-07-22 Nissan Motor Co Ltd 内燃機関のオイル回収構造
JP2006070758A (ja) * 2004-08-31 2006-03-16 Aichi Mach Ind Co Ltd 内燃機関

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8353268B2 (en) 2010-05-17 2013-01-15 GM Global Technology Operations LLC Oiling system for timing chains

Also Published As

Publication number Publication date
JP4661862B2 (ja) 2011-03-30
EP2071143A1 (en) 2009-06-17
DE602008004723D1 (de) 2011-03-10
JP2009144572A (ja) 2009-07-02

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