WO2014072816A2 - Lubricating oil supply structure for timing chain - Google Patents

Lubricating oil supply structure for timing chain Download PDF

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Publication number
WO2014072816A2
WO2014072816A2 PCT/IB2013/002740 IB2013002740W WO2014072816A2 WO 2014072816 A2 WO2014072816 A2 WO 2014072816A2 IB 2013002740 W IB2013002740 W IB 2013002740W WO 2014072816 A2 WO2014072816 A2 WO 2014072816A2
Authority
WO
WIPO (PCT)
Prior art keywords
lubricating oil
sprocket
chain
oil supply
timing chain
Prior art date
Application number
PCT/IB2013/002740
Other languages
French (fr)
Other versions
WO2014072816A3 (en
Inventor
Junji Watanabe
Original Assignee
Toyota Jidosha Kabushiki Kaisha
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 Jidosha Kabushiki Kaisha filed Critical Toyota Jidosha Kabushiki Kaisha
Publication of WO2014072816A2 publication Critical patent/WO2014072816A2/en
Publication of WO2014072816A3 publication Critical patent/WO2014072816A3/en

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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
    • F01M9/12—Non-pressurised lubrication, or non-closed-circuit lubrication, not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/05—Features relating to lubrication or cooling or heating of chains
    • 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
    • F01M1/02—Pressure lubrication using lubricating pumps
    • F01M2001/0284—Pressure lubrication using lubricating pumps mounting of the pump
    • 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
    • F02B67/08—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 non-mechanically driven auxiliary apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N2210/00—Applications
    • F16N2210/33—Chains
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N7/00—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated
    • F16N7/14—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated the lubricant being conveyed from the reservoir by mechanical means
    • F16N7/16—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated the lubricant being conveyed from the reservoir by mechanical means the oil being carried up by a lifting device

Definitions

  • the present invention relates to a lubricating oil supply structure for a timing chain.
  • a conventional lubricating oil supply structure for a timing chain which uses an oil jet for lubrication supply oil means in an engine valve mechanism that has a crank sprocket put on a crankshaft, a cam sprocket put on a cam shaft, and a timing chain wound around the crank sprocket and the cam shaft (for example, see Japanese Patent Application Publication No. 2007-023846).
  • the oil jet has an injection hole that opens toward the timing chain.
  • the oil jet is configured to communicate with a discharge opening of an oil pump via an oil gallery (lubricating oil path) formed inside a cylinder block.
  • the lubricating oil discharged from the oil pump is thus sprayed to the timing chain via the oil gallery and the oil jet.
  • the conventional lubricating oil supply structure for a timing chain requires a number of parts because the oil jet is required. Further, a number of processing steps of parts are required because the oil gallery is formed in the cylinder block.
  • the present invention provides a lubricating oil supply structure for a timing chain which can reduce parts and processing steps thereof compared to a conventional structure.
  • a lubricating oil supply structure for a timing chain in accordance with the present invention includes: a cylinder block; a cylinder head mounted on an upper portion of the cylinder block; an oil pan mounted on a lower portion of the cylinder block; a crankshaft supported by the cylinder block; a cam shaft supported by the cylinder head; an oil pump having a drive shaft in parallel with the crankshaft and housed in the oil pan; a first sprocket and a second sprocket that are put on the crankshaft; a third sprocket put on the cam shaft; a fourth sprocket put on the drive shaft of the oil pump so as to be immersed in lubricating oil stored in the oil pan; a timing chain wound around the first sprocket and the third sprocket; a drive chain wound around the second sprocket and the fourth sprocket; a chain cover mounted on the cylinder block so as to house the first sprocket, the second spro
  • the lubricating oil supply guide that covers the first sprocket and the second sprocket from above in the circumferential direction is provided between the cylinder block and the chain cover. Therefore, the lubricating oil stirred up from the oil pan when the fourth sprocket rotates and the drive chain moves contacts with a lower portion of the lubricating oil supply guide. Further, the lubricating oil drips toward the timing chain wound around the first sprocket. As a result, the timing chain is lubricated.
  • the lubricating oil supply guide may be integrally formed with the chain cover.
  • the lubricating oil supply guide is integrally formed with the chain cover. Therefore, the lubricating oil stirred up from the oil pan when the fourth sprocket rotates and the drive chain moves contacts with a lower portion of the lubricating oil supply guide and a boundary between the lubricating oil supply guide and the chain cover. Further, the lubricating oil drips toward the timing chain wound around the first sprocket. As a result, the timing chain is lubricated. [0010] In the lubricating oil supply structure for a timing chain according to above structure, the lubricating oil supply guide may be integrally formed with the cylinder block.
  • the lubricating oil supply guide is integrally formed with the cylinder block. Therefore, the lubricating oil stirred up from the oil pan when the fourth sprocket rotates and the drive chain moves contacts with the lower portion of the lubricating oil supply guide and a boundary between the lubricating oil supply guide and the cylinder block. Further, the lubricating oil drips toward the timing chain wound around the first sprocket. As a result, the timing chain is lubricated.
  • the present invention can provide a lubricating oil supply structure for a timing chain which can reduce parts and processing steps thereof.
  • FIG 1 is a partial cross-sectional view of an engine to which a lubricating oil supply structure for a timing chain in accordance with an embodiment of the present invention is applied;
  • FIG. 2 is a perspective view of components of the engine shown in FIG. 1 ;
  • FIG 3 is a schematic configuration diagram of the lubricating oil supply structure for a timing chain in accordance with the embodiment of the present invention.
  • FIG 4 is a partial cross-sectional view of an engine to which a lubricating oil supply structure for a timing chain in accordance with a modification of the embodiment of the present invention is applied.
  • an engine 10 to which a lubricating oil supply structure for a timing chain in accordance with this embodiment is applied is configured to include an engine main body 1, an oil pump 2, an engine valve mechanism 3, a pump driving mechanism 4, a chain cover 5, and a lubricating oil supply guide 6.
  • the engine main body 1 has a cylinder block 11, a cylinder head 12, an oil pan 13, and a cylinder head cover 14.
  • the cylinder block 11 is configured to generally horizontally support a crankshaft 15 that is a rotating element of the engine 10.
  • the crankshaft 15 rotates clockwise when seen from an engine front Fr side toward an engine rear Rr side.
  • the cylinder head 12 is mounted on an upper portion of the cylinder block 11. As shown in FIG. 2, the cylinder head 12 is configured to support an intake cam shaft 16 and an exhaust cam shaft 17.
  • the intake cam shaft 16 is positioned on an engine left Lh side of the upper portion of the cylinder head 12. Further, the exhaust cam shaft 17 is positioned on an engine right Rh side of the upper portion of the cylinder head 12.
  • the oil pan 13 is mounted on a lower portion of the cylinder block 11 and configured to store lubricating oil L in an inside.
  • the cylinder head cover 14 is mounted on the upper portion of the cylinder head 12. In addition, the cylinder head cover 14 houses the intake cam shaft 16 and the exhaust cam shaft 17.
  • the oil pump 2 has a drive shaft 21 in parallel with the crankshaft 15.
  • the drive shaft 21 protrudes toward the engine front Fr side.
  • the oil pump 2 is housed in the oil pan 13 and constantly immersed in the lubricating oil L stored in the oil pan 13.
  • the engine valve mechanism 3 has the above-described intake cam shaft 16, the above-described exhaust cam shaft 17, sprockets 31, 32, 33, a timing chain 34, a chain tensioner 35, and a chain guide 36.
  • the sprocket 31 is put on an end portion of the crankshaft 15 on the engine front Fr side.
  • the sprocket 32 is put on an end portion of the intake cam shaft 16 on the engine front Fr side.
  • the sprocket 32 is positioned above the above-described sprocket 31.
  • the sprocket 33 is put on an end portion of the exhaust cam shaft 17 on the engine front Fr side.
  • the sprocket 33 is positioned above the above-described sprocket 31.
  • the timing chain 34 is formed to be endless and wound around the sprockets 31, 32, 33.
  • the timing chain 34 transmits rotational movement of the crankshaft 15 to the intake cam shaft 16 and the exhaust cam shaft 17.
  • the timing chain 34 advances from a lower side to an upper side on the engine right Rh side of the sprockets 31, 33 when the crankshaft 15 rotates.
  • the timing chain 34 thereafter moves over from the sprocket 33 to the sprocket 32. Further, the timing chain 34 thereafter moves around from the upper side to the lower side on the engine left Lh side of the sprockets 31, 32.
  • the chain tensioner 35 is provided in an end portion of the engine main body 1 on the engine front Fr side.
  • the chain tensioner 35 presses the timing chain 34 positioned on the engine right Rh side of the sprockets 31, 33 toward the engine left Lh side. This provides tension to the timing chain 34.
  • the chain guide 36 is provided in the end portion of the engine main body 1 on the engine front Fr side.
  • the chain guide 36 prevents the timing chain 34 positioned on the engine left Lh side of the sprockets 31, 32 from swinging in a right-left direction.
  • the pump driving mechanism 4 has sprockets 41, 42, a drive chain 43, and a chain tensioner which is not shown.
  • the sprocket 41 is put on the end portion of the crankshaft 15 on the engine front Fr side.
  • the sprocket 41 is positioned on the engine rear Rr side of the sprocket 31 in the above-described engine valve mechanism 3.
  • the sprocket 42 is put on the drive shaft 21 of the oil pump 2. As shown in FIG. 3, the sprocket 42 is positioned below the sprocket 41 and constantly immersed in the lubricating oil L stored in the oil pan 13.
  • the drive chain 43 is formed to be endless and wound around the sprockets 41, 42.
  • the drive chain 43 transmits rotational movement of the crankshaft 15 to the drive shaft 21 of the oil pump 2.
  • the drive chain 43 advances from a lower side to an upper side on the engine right Rh side of the sprockets 41 , 42 when the crankshaft 15 rotates. Further, the drive chain 43 thereafter moves around from the upper side to the lower side on the engine left Lh side of the sprockets 41 , 42.
  • the chain tensioner which is not shown is provided in the end portion of the engine main body 1 on the engine front Fr side.
  • the chain tensioner presses the drive chain 43 positioned on the engine left Lh side of the sprockets 41, 42 toward the engine right Rh side. This provides tension to the drive chain 43.
  • the oil pump 2 draws in the lubricating oil L stored in the oil pan 13 when the rotation of the crankshaft 15 is transmitted to the drive shaft 21. Further, the oil pump 2 supplies the lubricating oil L to components in the engine 10 that require lubrication and cooling through the oil gallery (lubricating oil path) formed inside the cylinder block 11 and the cylinder head 12.
  • the components in the engine 10 to which the lubricating oil L is supplied through the oil gallery are, for example, a piston, a crank journal bearing, a connecting rod, an intake cam shaft journal bearing, an exhaust cam shaft journal bearing, and the like.
  • the chain cover 5 is provided in the end portion of the engine main body
  • the chain cover 5 is fastened to an end portion of the cylinder block 11 on the engine front Fr side, an end portion of the cylinder head 12 on the engine front Fr side, an upper portion of an end portion of the oil pan 13 on the engine front Fr side, and a lower portion of an end portion of the cylinder head cover 14 on the engine front Fr side.
  • the chain cover 5 houses the sprockets 31, 32, 33, the timing chain 34, the chain tensioner 35, the chain guide 36, the sprockets 41, 42, the drive chain 43, and the like.
  • a feature of the lubricating oil supply structure for a timing chain in accordance with this embodiment is that the lubricating oil supply guide 6 that covers the sprocket 31, 41 from above in the circumferential direction is provided between the cylinder block 11 and the chain cover 5 of the engine main body 1.
  • the lubricating oil supply guide 6 is integrally formed with the chain cover 5 to be positioned in proximity of the sprockets 31, 41 and protrudes from the chain cover 5 toward the cylinder block 11.
  • the drive chain 43 wound around the sprockets 41, 42 moves clockwise when seen from the engine front Fr side to the engine rear Rr side, along with the rotation of the crankshaft 15. Accordingly, rotational movement of the crankshaft 15 is transmitted to the drive shaft 21 of the oil pump 2.
  • the oil pump 2 draws in the lubricating oil L stored in the oil pan 13. Further, the oil pump 2 supplies the lubricating oil L to the piston, the crank journal bearing, the connecting rod, the intake cam shaft journal bearing, the exhaust cam shaft journal bearing, and the like through the oil gallery (lubricating oil path) formed inside the cylinder block 11 and the cylinder head 12.
  • the piston, the crank journal bearing, the connecting rod, the intake cam shaft journal bearing, the exhaust cam shaft journal bearing, and the like are lubricated and cooled by the lubricating oil L discharged by the oil pump 2.
  • the lubricating oil L contacts with a lower portion of the lubricating oil supply guide 6 and a boundary between the lubricating oil supply guide 6 and the chain cover 5. Further, the lubricating oil L drips toward the liming chain 34 wound around the sprocket 31 and lubricates the timing chain 34.
  • the lubricating oil supply guide 6 that covers the sprocket 31, 41 from above in the circumferential direction is provided between the cylinder block 11 and the chain cover 5 of the engine main body 1. Therefore, no oil jet for supplying the lubricating oil L to the timing chain 34 is required. In addition, an oil gallery for the oil jet is not required to be formed in the cylinder block 11.
  • the lubricating oil supply structure in accordance with this embodiment can reduce parts and processing steps thereof compared to a conventional structure and can reduce the production cost of the engine 10.
  • the lubricating oil supply structure for a timing chain in accordance with this embodiment has no oil gallery for supplying the lubricating oil L to the timing chain 34. Therefore, the work of the oil pump 2 is reduced compared to the conventional structure, thus reducing friction on the oil pump 2. Accordingly, because the load of the engine 10 that is a drive source of the oil pump 2 does not increase, an increase in fuel consumption can be prevented.
  • FIG 4 shows the engine 10 to which a modification of the lubricating oil supply structure for a timing chain in accordance with this embodiment is applied, in which portions provided with the same reference numerals and symbols as FIG 1 denote the same articles.
  • the engine 10 is configured to include the engine main body 1, the oil
  • a feature of the lubricating oil supply structure for a timing chain in accordance with this embodiment is that the lubricating oil supply guide 7 that covers the sprocket 31, 41 from above in the circumferential direction is provided between the cylinder block 11 and the chain cover 5 of the engine main body 1.
  • the lubricating oil supply guide 7 is integrally formed with the cylinder block 11 to be positioned in proximity of the sprockets 31, 41 and protrudes from the cylinder block 11 toward the chain cover 5.
  • the oil pump 2 draws in the lubricating oil L from the oil pan 13. Further, the oil pump 2 supplies the drawn lubricating oil L to the piston, the crank journal bearing, the connecting rod; the intake cam shaft journal bearing, the exhaust cam shaft journal bearing, and the like.
  • the piston, the crank journal bearing, the connecting rod, the intake cam shaft journal bearing, the exhaust cam shaft journal bearing, and the like are lubricated and cooled by the lubricating oil L discharged by the oil pump 2.
  • the lubricating oil L contacts with a lower portion of the lubricating oil supply guide 7 and a boundary between the lubricating oil supply guide 7 and the cylinder block 11. Further, the lubricating oil L drips toward the timing chain 34 wound around the sprocket 31 and lubricates the timing chain 34.
  • the lubricating oil supply guide 7 that covers the sprocket 31, 41 from above in the circumferential direction is provided between the cylinder block 11 and the chain cover 5 of the engine main body 1. Therefore, no oil jet for supplying the lubricating oil L to the timing chain 34 is required. In addition, an oil gallery is not required to be formed in the cylinder block 11.
  • the lubricating oil supply structure in accordance with this embodiment can reduce parts and processing steps thereof compared to the conventional structure in the same way as the lubricating oil supply structure shown in FIG. 1. In addition, the production cost of the engine 10 can be reduced.
  • the lubricating oil supply structure for a timing chain in accordance with this embodiment has no oil gallery for supplying the lubricating oil L to the timing chain 34 in the same way as the lubricating oil supply structure shown in FIG 1. Therefore, the work of the oil pump 2 is reduced compared to the conventional structure, thus reducing friction on the oil pump 2. Accordingly, because the load of the engine 10 that is a drive source of the oil pump 2 does not increase, an increase in fuel consumption can be prevented.
  • the lubricating oil supply structure for a timing chain in accordance with this embodiment when the engine 10 is started, lubrication of the timing chain 34 is immediately performed along with the rotation of the crankshaft 15 in the same way as the lubricating oil supply structure shown in FIG. 1. This secures lubrication of the timing chain 34.
  • the lubricating oil supply structure for a timing chain in accordance with this embodiment is to be used for an engine equipped with a DOHC type valve mechanism that has an intake cam shaft and an exhaust cam shaft.
  • the lubricating oil supply structure for a timing chain in accordance with the present invention may be applied to an engine equipped with an SOHC type valve mechanism that has a single cam shaft.
  • the lubricating oil supply structure may be applied to an engine equipped with an OHV type valve mechanism.
  • the lubricating oil supply structure for a timing chain in accordance with this embodiment is to be used for an engine in which a timing chain is arranged to be positioned on the engine front side of a drive chain of an oil pump.
  • the lubricating oil supply structure for a timing chain in accordance with the present invention can be applied to an engine in which the timing chain is arranged to be positioned on the engine rear side of the drive chain of the oil pump.
  • the lubricating oil supply structure for a liming chain in accordance with the present invention can reduce parts and processing steps thereof compared to a conventional structure. Therefore, the present invention has an effect of enabling reduction in the production cost of the engine and is thus useful for various kinds of engines.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • General Details Of Gearings (AREA)

Abstract

A lubricating oil supply structure includes an oil pump housed in a oil pan, sprockets put on a crankshaft, a sprocket put on a cam shaft, a sprocket put on a drive shaft of the oil pump so as to be immersed in lubricating oil in the oil pan, a timing chain wound around the sprockets, a drive chain wound around the sprockets, and a chain cover housing the sprockets, the timing chain, and the drive chain, and a lubricating oil supply guide covering the sprockets from above in a circumferential direction is provided between the cylinder block and the chain cover.

Description

LUBRICATING OIL SUPPLY STRUCTURE FOR TIMING CHAIN
BACKGROUND OF THE INVENTION 1. Field of the Invention
[0001] The present invention relates to a lubricating oil supply structure for a timing chain.
2. Description of Related Art
[0002] A conventional lubricating oil supply structure for a timing chain has been known which uses an oil jet for lubrication supply oil means in an engine valve mechanism that has a crank sprocket put on a crankshaft, a cam sprocket put on a cam shaft, and a timing chain wound around the crank sprocket and the cam shaft (for example, see Japanese Patent Application Publication No. 2007-023846).
[0003] The oil jet has an injection hole that opens toward the timing chain. The oil jet is configured to communicate with a discharge opening of an oil pump via an oil gallery (lubricating oil path) formed inside a cylinder block. The lubricating oil discharged from the oil pump is thus sprayed to the timing chain via the oil gallery and the oil jet.
[0004] However, the conventional lubricating oil supply structure for a timing chain requires a number of parts because the oil jet is required. Further, a number of processing steps of parts are required because the oil gallery is formed in the cylinder block.
SUMMARY OF THE INVENTION
[0005] Accordingly, the present invention provides a lubricating oil supply structure for a timing chain which can reduce parts and processing steps thereof compared to a conventional structure.
[0006] A lubricating oil supply structure for a timing chain in accordance with the present invention includes: a cylinder block; a cylinder head mounted on an upper portion of the cylinder block; an oil pan mounted on a lower portion of the cylinder block; a crankshaft supported by the cylinder block; a cam shaft supported by the cylinder head; an oil pump having a drive shaft in parallel with the crankshaft and housed in the oil pan; a first sprocket and a second sprocket that are put on the crankshaft; a third sprocket put on the cam shaft; a fourth sprocket put on the drive shaft of the oil pump so as to be immersed in lubricating oil stored in the oil pan; a timing chain wound around the first sprocket and the third sprocket; a drive chain wound around the second sprocket and the fourth sprocket; a chain cover mounted on the cylinder block so as to house the first sprocket, the second sprocket, the timing chain, and the drive chain; and a lubricating oil supply guide covering the first sprocket and the second sprocket from above in a circumferential direction between the cylinder block and the chain cover.
[0007] In the lubricating oil supply structure for a timing chain in accordance with the present invention, the lubricating oil supply guide that covers the first sprocket and the second sprocket from above in the circumferential direction is provided between the cylinder block and the chain cover. Therefore, the lubricating oil stirred up from the oil pan when the fourth sprocket rotates and the drive chain moves contacts with a lower portion of the lubricating oil supply guide. Further, the lubricating oil drips toward the timing chain wound around the first sprocket. As a result, the timing chain is lubricated.
[0008] In the lubricating oil supply structure for a timing chain according to above structure, the lubricating oil supply guide may be integrally formed with the chain cover.
[0009] Further, in the lubricating oil supply structure for a timing chain of the present invention, the lubricating oil supply guide is integrally formed with the chain cover. Therefore, the lubricating oil stirred up from the oil pan when the fourth sprocket rotates and the drive chain moves contacts with a lower portion of the lubricating oil supply guide and a boundary between the lubricating oil supply guide and the chain cover. Further, the lubricating oil drips toward the timing chain wound around the first sprocket. As a result, the timing chain is lubricated. [0010] In the lubricating oil supply structure for a timing chain according to above structure, the lubricating oil supply guide may be integrally formed with the cylinder block.
[0011] Further, in the lubricating oil supply structure for a timing chain of the present invention, the lubricating oil supply guide is integrally formed with the cylinder block. Therefore, the lubricating oil stirred up from the oil pan when the fourth sprocket rotates and the drive chain moves contacts with the lower portion of the lubricating oil supply guide and a boundary between the lubricating oil supply guide and the cylinder block. Further, the lubricating oil drips toward the timing chain wound around the first sprocket. As a result, the timing chain is lubricated.
[0012] The present invention can provide a lubricating oil supply structure for a timing chain which can reduce parts and processing steps thereof.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Features, advantages, and technical and industrial significance of exemplary embodiments of the invention will be described below with reference to the accompanying drawings, in which like numerals denote like elements, and wherein:
FIG 1 is a partial cross-sectional view of an engine to which a lubricating oil supply structure for a timing chain in accordance with an embodiment of the present invention is applied;
FIG. 2 is a perspective view of components of the engine shown in FIG. 1 ;
FIG 3 is a schematic configuration diagram of the lubricating oil supply structure for a timing chain in accordance with the embodiment of the present invention; and
FIG 4 is a partial cross-sectional view of an engine to which a lubricating oil supply structure for a timing chain in accordance with a modification of the embodiment of the present invention is applied. DETAILED DESCRIPTION OF EMBODIMENTS
[0014] An embodiment of a lubricating oil supply structure for a timing chain in accordance with the present invention will be described hereinafter with reference to drawings.
[0015] As shown in FIG 1, an engine 10 to which a lubricating oil supply structure for a timing chain in accordance with this embodiment is applied is configured to include an engine main body 1, an oil pump 2, an engine valve mechanism 3, a pump driving mechanism 4, a chain cover 5, and a lubricating oil supply guide 6.
[0016] The engine main body 1 has a cylinder block 11, a cylinder head 12, an oil pan 13, and a cylinder head cover 14. The cylinder block 11 is configured to generally horizontally support a crankshaft 15 that is a rotating element of the engine 10. The crankshaft 15 rotates clockwise when seen from an engine front Fr side toward an engine rear Rr side.
[0017] The cylinder head 12 is mounted on an upper portion of the cylinder block 11. As shown in FIG. 2, the cylinder head 12 is configured to support an intake cam shaft 16 and an exhaust cam shaft 17.
[0018] The intake cam shaft 16 is positioned on an engine left Lh side of the upper portion of the cylinder head 12. Further, the exhaust cam shaft 17 is positioned on an engine right Rh side of the upper portion of the cylinder head 12.
[0019] The oil pan 13 is mounted on a lower portion of the cylinder block 11 and configured to store lubricating oil L in an inside.
[0020] The cylinder head cover 14 is mounted on the upper portion of the cylinder head 12. In addition, the cylinder head cover 14 houses the intake cam shaft 16 and the exhaust cam shaft 17.
[0021] The oil pump 2 has a drive shaft 21 in parallel with the crankshaft 15.
The drive shaft 21 protrudes toward the engine front Fr side. The oil pump 2 is housed in the oil pan 13 and constantly immersed in the lubricating oil L stored in the oil pan 13.
[0022] The engine valve mechanism 3 has the above-described intake cam shaft 16, the above-described exhaust cam shaft 17, sprockets 31, 32, 33, a timing chain 34, a chain tensioner 35, and a chain guide 36.
[0023] The sprocket 31 is put on an end portion of the crankshaft 15 on the engine front Fr side.
[0024] The sprocket 32 is put on an end portion of the intake cam shaft 16 on the engine front Fr side. The sprocket 32 is positioned above the above-described sprocket 31.
[0025] The sprocket 33 is put on an end portion of the exhaust cam shaft 17 on the engine front Fr side. The sprocket 33 is positioned above the above-described sprocket 31.
[0026] The timing chain 34 is formed to be endless and wound around the sprockets 31, 32, 33. The timing chain 34 transmits rotational movement of the crankshaft 15 to the intake cam shaft 16 and the exhaust cam shaft 17.
[0027] The timing chain 34 advances from a lower side to an upper side on the engine right Rh side of the sprockets 31, 33 when the crankshaft 15 rotates. The timing chain 34 thereafter moves over from the sprocket 33 to the sprocket 32. Further, the timing chain 34 thereafter moves around from the upper side to the lower side on the engine left Lh side of the sprockets 31, 32.
[0028] The chain tensioner 35 is provided in an end portion of the engine main body 1 on the engine front Fr side. The chain tensioner 35 presses the timing chain 34 positioned on the engine right Rh side of the sprockets 31, 33 toward the engine left Lh side. This provides tension to the timing chain 34.
[0029] The chain guide 36 is provided in the end portion of the engine main body 1 on the engine front Fr side. The chain guide 36 prevents the timing chain 34 positioned on the engine left Lh side of the sprockets 31, 32 from swinging in a right-left direction.
[0030] The pump driving mechanism 4 has sprockets 41, 42, a drive chain 43, and a chain tensioner which is not shown.
[0031] The sprocket 41 is put on the end portion of the crankshaft 15 on the engine front Fr side. The sprocket 41 is positioned on the engine rear Rr side of the sprocket 31 in the above-described engine valve mechanism 3.
[0032] The sprocket 42 is put on the drive shaft 21 of the oil pump 2. As shown in FIG. 3, the sprocket 42 is positioned below the sprocket 41 and constantly immersed in the lubricating oil L stored in the oil pan 13.
[0033] The drive chain 43 is formed to be endless and wound around the sprockets 41, 42. The drive chain 43 transmits rotational movement of the crankshaft 15 to the drive shaft 21 of the oil pump 2.
[0034] The drive chain 43 advances from a lower side to an upper side on the engine right Rh side of the sprockets 41 , 42 when the crankshaft 15 rotates. Further, the drive chain 43 thereafter moves around from the upper side to the lower side on the engine left Lh side of the sprockets 41 , 42.
[0035] The chain tensioner which is not shown is provided in the end portion of the engine main body 1 on the engine front Fr side. The chain tensioner presses the drive chain 43 positioned on the engine left Lh side of the sprockets 41, 42 toward the engine right Rh side. This provides tension to the drive chain 43.
[0036] The oil pump 2 draws in the lubricating oil L stored in the oil pan 13 when the rotation of the crankshaft 15 is transmitted to the drive shaft 21. Further, the oil pump 2 supplies the lubricating oil L to components in the engine 10 that require lubrication and cooling through the oil gallery (lubricating oil path) formed inside the cylinder block 11 and the cylinder head 12.
[0037] Here, the components in the engine 10 to which the lubricating oil L is supplied through the oil gallery are, for example, a piston, a crank journal bearing, a connecting rod, an intake cam shaft journal bearing, an exhaust cam shaft journal bearing, and the like.
[0038] The chain cover 5 is provided in the end portion of the engine main body
1 on the engine front Fr side. More specifically, the chain cover 5 is fastened to an end portion of the cylinder block 11 on the engine front Fr side, an end portion of the cylinder head 12 on the engine front Fr side, an upper portion of an end portion of the oil pan 13 on the engine front Fr side, and a lower portion of an end portion of the cylinder head cover 14 on the engine front Fr side.
[0039] The chain cover 5 houses the sprockets 31, 32, 33, the timing chain 34, the chain tensioner 35, the chain guide 36, the sprockets 41, 42, the drive chain 43, and the like.
[0040] A feature of the lubricating oil supply structure for a timing chain in accordance with this embodiment is that the lubricating oil supply guide 6 that covers the sprocket 31, 41 from above in the circumferential direction is provided between the cylinder block 11 and the chain cover 5 of the engine main body 1.
[0041] The lubricating oil supply guide 6 is integrally formed with the chain cover 5 to be positioned in proximity of the sprockets 31, 41 and protrudes from the chain cover 5 toward the cylinder block 11.
[0042] Next, operation will be described. When the engine 10 is started, the timing chain 34 wound around the sprockets 31, 32, 33 moves clockwise when seen from the engine front Fr side to the engine rear Rr side, along with the rotation of the crankshaft 15. Accordingly, rotational movement of the crankshaft 15 is transmitted to the intake cam shaft 16 and the exhaust cam shaft 17, and an intake valve and an exhaust valve of the engine 10 open or close at timings corresponding to the number of rotation of the crankshaft 15.
[0043] The drive chain 43 wound around the sprockets 41, 42 moves clockwise when seen from the engine front Fr side to the engine rear Rr side, along with the rotation of the crankshaft 15. Accordingly, rotational movement of the crankshaft 15 is transmitted to the drive shaft 21 of the oil pump 2.
[0044] The oil pump 2 draws in the lubricating oil L stored in the oil pan 13. Further, the oil pump 2 supplies the lubricating oil L to the piston, the crank journal bearing, the connecting rod, the intake cam shaft journal bearing, the exhaust cam shaft journal bearing, and the like through the oil gallery (lubricating oil path) formed inside the cylinder block 11 and the cylinder head 12.
[0045] The piston, the crank journal bearing, the connecting rod, the intake cam shaft journal bearing, the exhaust cam shaft journal bearing, and the like are lubricated and cooled by the lubricating oil L discharged by the oil pump 2.
[0046] The sprocket 42 put on the drive shaft 21 of the oil pump 2 is immersed in the lubricating oil L stored in the oil pan 13. Thus, when the drive chain 43 moves around, the lubricating oil L stored in the oil pan 13 is stirred up by the sprocket 42 and me drive chain 43.
[0047] The lubricating oil L contacts with a lower portion of the lubricating oil supply guide 6 and a boundary between the lubricating oil supply guide 6 and the chain cover 5. Further, the lubricating oil L drips toward the liming chain 34 wound around the sprocket 31 and lubricates the timing chain 34.
[0048] In other words, when the engine 10 is started, lubrication of the timing chain 34 is immediately performed along with the rotation of the crankshaft 15.
[0049] In the lubricating oil supply structure for a timing chain in accordance with this embodiment, the lubricating oil supply guide 6 that covers the sprocket 31, 41 from above in the circumferential direction is provided between the cylinder block 11 and the chain cover 5 of the engine main body 1. Therefore, no oil jet for supplying the lubricating oil L to the timing chain 34 is required. In addition, an oil gallery for the oil jet is not required to be formed in the cylinder block 11.
[0050] Accordingly, the lubricating oil supply structure in accordance with this embodiment can reduce parts and processing steps thereof compared to a conventional structure and can reduce the production cost of the engine 10.
[0051] Further, the lubricating oil supply structure for a timing chain in accordance with this embodiment has no oil gallery for supplying the lubricating oil L to the timing chain 34. Therefore, the work of the oil pump 2 is reduced compared to the conventional structure, thus reducing friction on the oil pump 2. Accordingly, because the load of the engine 10 that is a drive source of the oil pump 2 does not increase, an increase in fuel consumption can be prevented.
[0052] Further, in the lubricating oil supply structure for a timing chain in accordance with this embodiment, when the engine 10 is started, lubrication of the timing chain 34 is immediately performed along with the rotation of the crankshaft 15. This secures lubrication of the timing chain 34.
[0053] FIG 4 shows the engine 10 to which a modification of the lubricating oil supply structure for a timing chain in accordance with this embodiment is applied, in which portions provided with the same reference numerals and symbols as FIG 1 denote the same articles.
[0054] The engine 10 is configured to include the engine main body 1, the oil
1
pump 2, the engine valve mechanism 3, the pump driving mechanism 4, the chain cover 5, and a lubricating oil supply guide 7.
[0055] A feature of the lubricating oil supply structure for a timing chain in accordance with this embodiment is that the lubricating oil supply guide 7 that covers the sprocket 31, 41 from above in the circumferential direction is provided between the cylinder block 11 and the chain cover 5 of the engine main body 1.
[0056] The lubricating oil supply guide 7 is integrally formed with the cylinder block 11 to be positioned in proximity of the sprockets 31, 41 and protrudes from the cylinder block 11 toward the chain cover 5.
[0057] Next, operation will be described. When the engine 10 is started, the drive chain 43 wound around the sprockets 41, 42 moves along with the rotation of the crankshaft 15. Accordingly, rotational movement of the crankshaft 15 is transmitted to the drive shaft 21 of the oil pump 2.
[0058] As described above, the oil pump 2 draws in the lubricating oil L from the oil pan 13. Further, the oil pump 2 supplies the drawn lubricating oil L to the piston, the crank journal bearing, the connecting rod; the intake cam shaft journal bearing, the exhaust cam shaft journal bearing, and the like.
[0059] Accordingly, the piston, the crank journal bearing, the connecting rod, the intake cam shaft journal bearing, the exhaust cam shaft journal bearing, and the like are lubricated and cooled by the lubricating oil L discharged by the oil pump 2.
[0060] The sprocket 42 put on the drive shaft 21 of the oil pump 2 is immersed in the lubricating oil L stored in the oil pan 13. Thus, when the drive chain 43 moves around, the lubricating oil L stored in the oil pan 13 is stirred up by the sprocket 42 and the drive chain 43.
[0061] The lubricating oil L contacts with a lower portion of the lubricating oil supply guide 7 and a boundary between the lubricating oil supply guide 7 and the cylinder block 11. Further, the lubricating oil L drips toward the timing chain 34 wound around the sprocket 31 and lubricates the timing chain 34.
[0062] When the engine 10 is started, lubrication of the timing chain 34 is immediately performed along with the rotation of the crankshaft 15.
[0063] In the lubricating oil supply structure for a timing chain in accordance with this embodiment, the lubricating oil supply guide 7 that covers the sprocket 31, 41 from above in the circumferential direction is provided between the cylinder block 11 and the chain cover 5 of the engine main body 1. Therefore, no oil jet for supplying the lubricating oil L to the timing chain 34 is required. In addition, an oil gallery is not required to be formed in the cylinder block 11.
[0064] The lubricating oil supply structure in accordance with this embodiment can reduce parts and processing steps thereof compared to the conventional structure in the same way as the lubricating oil supply structure shown in FIG. 1. In addition, the production cost of the engine 10 can be reduced.
[0065] The lubricating oil supply structure for a timing chain in accordance with this embodiment has no oil gallery for supplying the lubricating oil L to the timing chain 34 in the same way as the lubricating oil supply structure shown in FIG 1. Therefore, the work of the oil pump 2 is reduced compared to the conventional structure, thus reducing friction on the oil pump 2. Accordingly, because the load of the engine 10 that is a drive source of the oil pump 2 does not increase, an increase in fuel consumption can be prevented.
[0066] In the lubricating oil supply structure for a timing chain in accordance with this embodiment, when the engine 10 is started, lubrication of the timing chain 34 is immediately performed along with the rotation of the crankshaft 15 in the same way as the lubricating oil supply structure shown in FIG. 1. This secures lubrication of the timing chain 34. [0067] The lubricating oil supply structure for a timing chain in accordance with this embodiment is to be used for an engine equipped with a DOHC type valve mechanism that has an intake cam shaft and an exhaust cam shaft. However, the lubricating oil supply structure for a timing chain in accordance with the present invention may be applied to an engine equipped with an SOHC type valve mechanism that has a single cam shaft. Alternatively, the lubricating oil supply structure may be applied to an engine equipped with an OHV type valve mechanism.
[0068] The lubricating oil supply structure for a timing chain in accordance with this embodiment is to be used for an engine in which a timing chain is arranged to be positioned on the engine front side of a drive chain of an oil pump. However, the lubricating oil supply structure for a timing chain in accordance with the present invention can be applied to an engine in which the timing chain is arranged to be positioned on the engine rear side of the drive chain of the oil pump.
[0069] As described above, the lubricating oil supply structure for a liming chain in accordance with the present invention can reduce parts and processing steps thereof compared to a conventional structure. Therefore, the present invention has an effect of enabling reduction in the production cost of the engine and is thus useful for various kinds of engines.

Claims

1. A lubricating oil supply structure for a timing chain, comprising:
a cylinder block;
a cylmder head mounted on an upper portion of the cylinder block;
an oil pan mounted on a lower portion of the cylinder block;
a crankshaft supported by the cylinder block;
a cam shaft supported by the cylinder head;
an oil pump having a drive shaft in parallel with the crankshaft and housed in the oil pan;
a first sprocket and a second sprocket that are put on the crankshaft;
a third sprocket put on the cam shaft;
a fourth sprocket put on the drive shaft of the oil pump, the fourth sprocket being immersed in lubricating oil stored in the oil pan;
a timing chain wound around the first sprocket and the third sprocket;
a drive chain wound around the second sprocket and the fourth sprocket;
a chain cover mounted on the cylinder block, the chain cover housing the first sprocket, the second sprocket, the timing chain, and the drive chain; and
a lubricating oil supply guide covering the first sprocket and the second sprocket from above in a circumferential direction between the cylinder block and the chain cover.
2. The lubricating oil supply structure for a timing chain according to claim 1, wherein the chain cover has integrally the lubricating oil supply guide.
3. The lubricating oil supply structure for a timing chain according to claim 1, wherein the cylinder block has integrally the lubricating oil supply guide.
PCT/IB2013/002740 2012-11-08 2013-11-05 Lubricating oil supply structure for timing chain WO2014072816A2 (en)

Applications Claiming Priority (2)

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JP2012246320A JP2014095317A (en) 2012-11-08 2012-11-08 Lubricating oil supply structure for timing chain
JP2012-246320 2012-11-08

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WO2014072816A2 true WO2014072816A2 (en) 2014-05-15
WO2014072816A3 WO2014072816A3 (en) 2014-09-12

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JP6521816B2 (en) * 2015-09-28 2019-05-29 ダイハツ工業株式会社 Lubrication structure of timing chain

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007023846A (en) 2005-07-14 2007-02-01 Toyota Motor Corp Chain lubricating mechanism for internal combustion engine

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2620897A (en) * 1950-08-09 1952-12-09 Renold & Coventry Chain Co Chain drive with lubricating means
JPH0625602Y2 (en) * 1985-08-06 1994-07-06 マツダ株式会社 Engine camshaft drive
JP2748479B2 (en) * 1988-12-29 1998-05-06 スズキ株式会社 Continuously variable transmission for vehicles
DE10156237A1 (en) * 2001-11-09 2003-05-22 Iav Gmbh Control drive for camshaft drive of internal combustion engine has assembly support for connecting with engine block with oil duct and spray nozzle and oil separating ribs to reduce oil mist
DE10159087C2 (en) * 2001-12-01 2003-11-13 Porsche Ag Internal combustion engine
JP2004052629A (en) * 2002-07-18 2004-02-19 Honda Motor Co Ltd Engine chain case structure
JP2008020026A (en) * 2006-07-14 2008-01-31 Toyota Motor Corp Chain-lubricating structure
JP4661862B2 (en) * 2007-12-12 2011-03-30 トヨタ自動車株式会社 Oil supply structure for internal combustion engine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007023846A (en) 2005-07-14 2007-02-01 Toyota Motor Corp Chain lubricating mechanism for internal combustion engine

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