US20050061290A1 - Engine lubrication system and pressure reducing valve for limiting overhead oil flow - Google Patents
Engine lubrication system and pressure reducing valve for limiting overhead oil flow Download PDFInfo
- Publication number
- US20050061290A1 US20050061290A1 US10/666,864 US66686403A US2005061290A1 US 20050061290 A1 US20050061290 A1 US 20050061290A1 US 66686403 A US66686403 A US 66686403A US 2005061290 A1 US2005061290 A1 US 2005061290A1
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- Prior art keywords
- oil
- gallery
- cam
- engine
- pressure
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- 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.)
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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
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
-
- 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
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0005—Deactivating valves
-
- 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
-
- 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
- F01M1/16—Controlling lubricant pressure or quantity
-
- 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
Definitions
- This invention relates to engine oil systems and, more particularly, to a system including a pressure reducing valve to optimize oil flow and pressure for various lubrication and actuation functions.
- lubricating oil for many purposes including for example, lubricating moving parts, actuating cam phasers, and controlling switching valve lifters for valve stepping and cylinder deactivation.
- Cam phasers and cylinder deactivation devices generally require a higher oil pressure for actuation during engine operation than the moving parts of the engine require for proper lubrication.
- Switching lifters generally require high oil pressure for high lift operation and a lower oil pressure for low lift operation.
- the present invention provides an oil system for an internal combustion engine having a pressure reducing valve to optimize oil pressures in the engine while increasing engine efficiency by minimizing parasitic losses created from over lubrication.
- the oil system includes an oil pump having an inlet and an outlet.
- An oil pickup connected with the inlet extends into an engine oil sump to draw oil into the oil system.
- the outlet of the oil pump connects to a main oil feed which supplies oil to a main bearing gallery and a hydraulically actuated device such as a cam phaser or switching lifters.
- Oil sent to the cam phaser is used to actuate the cam phaser, while oil directed to the main bearing gallery is used primarily for lubrication purposes.
- a control which supplies oil pressure to the switching lifters to allow valve stepping or cylinder deactivation.
- some of the oil pumped into the main bearing gallery is sent through a cam gallery feed to a cam gallery in an upper part of the engine for lubrication of a valve train.
- a pressure reducing valve connected between the main bearing gallery and the cam gallery acts as a flow restrictor that selectively limits oil flow to the cam gallery.
- the pressure reducing valve includes an orifice to limit oil flow into the cam gallery under low oil pressure conditions.
- the flow restrictor partially closes outlet openings to maintain a constant oil pressure in the cam gallery.
- the restriction of oil flow to the cam gallery created by the valve forms back pressure before the valve which increases oil pressure in the main feed.
- the increased oil pressure within the main feed is then available for operating the hydraulically actuated device.
- the oil pressure to the hydraulically actuated device and the main bearing gallery is increased while the rest of the oil system operates at a lower oil pressure.
- This allows cam phasing or cylinder deactivation at engine idle or other conditions when oil pump pressure would otherwise be too low to actuate the cam phaser or the switching lifters.
- the increased oil pressure supplied to the hydraulically actuated device allows the device to be operated at all engine speeds without a large increase in the size of the oil pump. The use of a smaller oil pump reduces parasitic losses for increased engine efficiency.
- FIG. 1 is a pictorial view of an internal combustion engine including an oil system with a cam phaser according to the invention
- FIG. 2 is a pictorial view of a portion of a direct acting valve train with switching lifters having portions broken away to show interior features of the components;
- FIG. 3 is a pictorial view of an exemplary oil system for the engine of FIG. 1 ;
- FIG. 4 is a pictorial view of a pressure reducing valve for the oil system.
- numeral 10 generally indicates an internal combustion engine.
- the engine includes a cylinder block 12 having a bank of cylinders 14 containing pistons 16 connected with a crankshaft 18 .
- a cylinder head 20 carries intake and exhaust valves 21 , 22 actuated by camshafts 24 , 26 .
- a cam phaser 28 is mounted on the exhaust camshaft 26 to vary the exhaust valve timing.
- An oil pan 30 below the block forms an oil sump for the engine.
- FIG. 2 illustrates an exhaust portion of an engine valve train 32 for use in an overhead cam piston type engine.
- the valve train 32 includes exhaust camshaft 26 which is driven through a drive sprocket 34 connected by a chain 36 ( FIG. 1 ) with the engine crankshaft 18 .
- Cam phaser 28 is connected between the sprocket 34 and the camshaft 26 in order to vary the timing of the camshaft relative to the piston motion and other operating functions of the engine and relative to other camshafts of the engine.
- the exhaust valves 22 are actuated through switching valve lifters 38 which are engaged by cams 40 of the camshaft 26 .
- the switching valve lifters 38 react to oil pressure to deactivate or selectively change the amount of valve lift provided for the associated exhaust valves 22 .
- a controller 42 receives oil pressure and distributes or cuts off the control pressure to the switching lifters 38 to actuate the valve train 32 .
- the controller 42 may supply oil pressure to the switching lifters 38 to reduce valve lift or disable valve lift for cylinder deactivation.
- FIG. 3 illustrates the passages of an oil system 44 within the engine 10 .
- the oil system includes an engine driven oil pump 46 having an inlet 48 and an outlet 50 .
- An oil pickup 52 connected with the pump 46 extends into the sump of the oil pan 30 .
- the pump 46 connects through an oil filter 54 with a main oil feed 56 .
- the main oil feed 56 distributes oil to a cam phaser feed 58 and a main bearing gallery 60 .
- the main bearing gallery 60 supplies oil to crankshaft main bearings and connecting rod bearings, not shown.
- the main bearing gallery 60 connects a cam gallery feed 62 which carries oil to a cam gallery 64 for lubricating camshaft bearings and valve gear 66 within the cylinder head 20 of the engine 10 .
- a pressure reducing valve 68 as shown in FIG. 4 is, connected between the main bearing gallery 60 and the cam gallery 64 .
- the pressure reducing valve 68 has a tubular housing 70 surrounding a slidable flow control piston 72 .
- the piston 72 internally defines an orifice 74 .
- a biasing spring 76 between the piston 72 and an outlet end 78 of the housing 70 urges the piston 72 toward an inlet end 80 of the housing having a large inlet opening 82 .
- a plurality of outlet openings 84 extend through a tubular wall of the housing 70 adjacent the outlet end 78 .
- the oil pump 46 draws oil from the oil pan 30 through the oil pickup 52 .
- the oil is then pumped through the pump outlet 50 and oil filter 54 to the main oil feed 56 .
- the oil in the main oil feed 56 is then directed to the main bearing gallery 60 and the cam phaser 28 .
- Some of the oil in the main bearing gallery 60 flows to the cam gallery 64 through the pressure reducing valve 68 .
- the biasing spring 76 holds the flow control piston 72 against the inlet end 80 of the housing 70 , opening the outlet openings 84 to allow oil to flow through the pressure reducing valve 68 .
- oil flow from the main bearing gallery 60 passes through the piston orifice 74 into the outlet end 78 of the housing 70 and through the outlet openings 84 to the cam gallery 64 .
- the piston 72 begins to slide toward the outlet end 78 and compress the biasing spring 76 .
- the piston restricts access to the outlet openings 84 to maintain constant oil pressure to the cam gallery 64 .
- the biasing spring 76 pushes the piston 72 back toward the inlet end 80 to open the outlet openings 84 and maintain constant oil pressure to the cam gallery 64 .
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
Abstract
Description
- This invention relates to engine oil systems and, more particularly, to a system including a pressure reducing valve to optimize oil flow and pressure for various lubrication and actuation functions.
- Internal combustion engines may use lubricating oil for many purposes including for example, lubricating moving parts, actuating cam phasers, and controlling switching valve lifters for valve stepping and cylinder deactivation. Cam phasers and cylinder deactivation devices generally require a higher oil pressure for actuation during engine operation than the moving parts of the engine require for proper lubrication. Switching lifters generally require high oil pressure for high lift operation and a lower oil pressure for low lift operation.
- Since engines having cam phasers or cylinder deactivation devices generally require higher than normal oil pressure for their operation, while other components which do not require high pressure lubrication, such as a valvetrain components, can be over lubricated. Since valve trains commonly require a relatively low oil pressure to provide adequate lubrication to prevent engine wear, a method of reducing oil pressure to an engine's valve train is desired to reduce overall oil flow and increase engine efficiency.
- Co-pending applications pertaining to related subject matter were filed concurrently with this application on ______, 2003 as U.S. application Ser. No. ______ (GP-302777), U.S. application Ser. No. ______ (GP-303044), and U.S. application Ser. No. ______ (GP-303046).
- The present invention provides an oil system for an internal combustion engine having a pressure reducing valve to optimize oil pressures in the engine while increasing engine efficiency by minimizing parasitic losses created from over lubrication.
- In an exemplary embodiment, the oil system includes an oil pump having an inlet and an outlet. An oil pickup connected with the inlet extends into an engine oil sump to draw oil into the oil system. The outlet of the oil pump connects to a main oil feed which supplies oil to a main bearing gallery and a hydraulically actuated device such as a cam phaser or switching lifters. Oil sent to the cam phaser is used to actuate the cam phaser, while oil directed to the main bearing gallery is used primarily for lubrication purposes. When switching lifters are present, some of the oil directed to the cam phaser is diverted to a control, which supplies oil pressure to the switching lifters to allow valve stepping or cylinder deactivation. In addition, some of the oil pumped into the main bearing gallery is sent through a cam gallery feed to a cam gallery in an upper part of the engine for lubrication of a valve train.
- A pressure reducing valve connected between the main bearing gallery and the cam gallery acts as a flow restrictor that selectively limits oil flow to the cam gallery. The pressure reducing valve includes an orifice to limit oil flow into the cam gallery under low oil pressure conditions. During high oil pressure conditions, the flow restrictor partially closes outlet openings to maintain a constant oil pressure in the cam gallery.
- The restriction of oil flow to the cam gallery created by the valve forms back pressure before the valve which increases oil pressure in the main feed. The increased oil pressure within the main feed is then available for operating the hydraulically actuated device. As a result, the oil pressure to the hydraulically actuated device and the main bearing gallery is increased while the rest of the oil system operates at a lower oil pressure. This allows cam phasing or cylinder deactivation at engine idle or other conditions when oil pump pressure would otherwise be too low to actuate the cam phaser or the switching lifters. The increased oil pressure supplied to the hydraulically actuated device allows the device to be operated at all engine speeds without a large increase in the size of the oil pump. The use of a smaller oil pump reduces parasitic losses for increased engine efficiency.
- These and other features and advantages of the invention will be more fully understood from the following description of certain specific embodiments of the invention taken together with the accompanying drawings.
-
FIG. 1 is a pictorial view of an internal combustion engine including an oil system with a cam phaser according to the invention; -
FIG. 2 is a pictorial view of a portion of a direct acting valve train with switching lifters having portions broken away to show interior features of the components; -
FIG. 3 is a pictorial view of an exemplary oil system for the engine ofFIG. 1 ; and -
FIG. 4 is a pictorial view of a pressure reducing valve for the oil system. - Referring now to
FIG. 1 of the drawings in detail,numeral 10 generally indicates an internal combustion engine. The engine includes acylinder block 12 having a bank ofcylinders 14 containingpistons 16 connected with acrankshaft 18. Acylinder head 20 carries intake andexhaust valves camshafts cam phaser 28 is mounted on theexhaust camshaft 26 to vary the exhaust valve timing. Anoil pan 30 below the block forms an oil sump for the engine. -
FIG. 2 illustrates an exhaust portion of anengine valve train 32 for use in an overhead cam piston type engine. Thevalve train 32 includesexhaust camshaft 26 which is driven through adrive sprocket 34 connected by a chain 36 (FIG. 1 ) with theengine crankshaft 18.Cam phaser 28 is connected between thesprocket 34 and thecamshaft 26 in order to vary the timing of the camshaft relative to the piston motion and other operating functions of the engine and relative to other camshafts of the engine. - The
exhaust valves 22 are actuated through switchingvalve lifters 38 which are engaged bycams 40 of thecamshaft 26. Theswitching valve lifters 38 react to oil pressure to deactivate or selectively change the amount of valve lift provided for the associatedexhaust valves 22. Acontroller 42 receives oil pressure and distributes or cuts off the control pressure to the switchinglifters 38 to actuate thevalve train 32. Thecontroller 42 may supply oil pressure to theswitching lifters 38 to reduce valve lift or disable valve lift for cylinder deactivation. -
FIG. 3 illustrates the passages of anoil system 44 within theengine 10. The oil system includes an engine drivenoil pump 46 having aninlet 48 and anoutlet 50. Anoil pickup 52 connected with thepump 46 extends into the sump of theoil pan 30. Thepump 46 connects through anoil filter 54 with amain oil feed 56. Themain oil feed 56 distributes oil to acam phaser feed 58 and amain bearing gallery 60. Themain bearing gallery 60 supplies oil to crankshaft main bearings and connecting rod bearings, not shown. Themain bearing gallery 60 connects acam gallery feed 62 which carries oil to acam gallery 64 for lubricating camshaft bearings andvalve gear 66 within thecylinder head 20 of theengine 10. - In accordance with the invention, a
pressure reducing valve 68, as shown inFIG. 4 is, connected between themain bearing gallery 60 and thecam gallery 64. Thepressure reducing valve 68 has atubular housing 70 surrounding a slidableflow control piston 72. Thepiston 72 internally defines anorifice 74. A biasingspring 76 between thepiston 72 and anoutlet end 78 of thehousing 70 urges thepiston 72 toward aninlet end 80 of the housing having a large inlet opening 82. A plurality ofoutlet openings 84 extend through a tubular wall of thehousing 70 adjacent theoutlet end 78. - During engine operation, the
oil pump 46 draws oil from theoil pan 30 through theoil pickup 52. The oil is then pumped through thepump outlet 50 andoil filter 54 to themain oil feed 56. The oil in themain oil feed 56 is then directed to themain bearing gallery 60 and thecam phaser 28. Some of the oil in themain bearing gallery 60 flows to thecam gallery 64 through thepressure reducing valve 68. - Under low oil pressure conditions, the biasing
spring 76 holds theflow control piston 72 against theinlet end 80 of thehousing 70, opening theoutlet openings 84 to allow oil to flow through thepressure reducing valve 68. Thus, oil flow from themain bearing gallery 60 passes through thepiston orifice 74 into the outlet end 78 of thehousing 70 and through theoutlet openings 84 to thecam gallery 64. - As oil pressure increases at the
inlet end 80 of thehousing 70, thepiston 72 begins to slide toward theoutlet end 78 and compress the biasingspring 76. As thepiston 72 moves toward theoutlet end 78, the piston restricts access to theoutlet openings 84 to maintain constant oil pressure to thecam gallery 64. As oil pressure on theinlet end 80 of thehousing 70 is reduced, the biasingspring 76 pushes thepiston 72 back toward theinlet end 80 to open theoutlet openings 84 and maintain constant oil pressure to thecam gallery 64. - At lower engine speeds while oil pump output is minimal, only a small portion of the oil pumped though the
oil system 44 flows through theorifice 74 of thepressure reducing valve 68. The remainder of the oil not flowing through theorifice 74 builds oil pressure on theinlet end 80 of thepressure reducing valve 68 which creates back pressure in themain bearing gallery 60 and in turn increases oil pressure tomain oil feed 56 and thecam phaser 28. This allows thecam phaser 28 to actuate during idle and low rpm conditions, when oil pump pressure would otherwise be too low for cam phaser actuation. - As engine speed increases, the output from the
oil pump 34 increases, causing the oil pressure in thesystem 32 to increase. As oil pressure increases at theinlet end 68, thepiston 60 slides toward theoutlet end 66 against the biasingspring 64. The movement of thepiston 60 restricts flow through thepressure reducing valve 56 by closing theoutlet openings 72. The restriction of oil to flow through thepressure reducing valve 56 maintains a lower oil pressure in the cam gallery than in the remainder of the system. The restriction of oil flow to thecam gallery 64 limits the system's oil flow requirements, thereby allowing theengine 10 to operate with a smaller more efficient oil pump. - While the invention has been described by reference to certain preferred embodiments, it should be understood that numerous changes could be made within the spirit and scope of the inventive concepts described. Accordingly, it is intended that the invention not be limited to the disclosed embodiments, but that it have the full scope permitted by the language of the following claims.
Claims (11)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/666,864 US6860250B1 (en) | 2003-09-18 | 2003-09-18 | Engine lubrication system and pressure reducing valve for limiting overhead oil flow |
DE102004044998A DE102004044998B4 (en) | 2003-09-18 | 2004-09-16 | Engine lubrication system and pressure reducing valve to limit excess oil flow |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/666,864 US6860250B1 (en) | 2003-09-18 | 2003-09-18 | Engine lubrication system and pressure reducing valve for limiting overhead oil flow |
Publications (2)
Publication Number | Publication Date |
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US6860250B1 US6860250B1 (en) | 2005-03-01 |
US20050061290A1 true US20050061290A1 (en) | 2005-03-24 |
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ID=34194784
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/666,864 Expired - Fee Related US6860250B1 (en) | 2003-09-18 | 2003-09-18 | Engine lubrication system and pressure reducing valve for limiting overhead oil flow |
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US (1) | US6860250B1 (en) |
DE (1) | DE102004044998B4 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090311115A1 (en) * | 2008-06-12 | 2009-12-17 | Aisin Seiki Kabushiki Kaisha | Oil supplying apparatus for vehicle |
US20120024631A1 (en) * | 2010-05-11 | 2012-02-02 | Snecma | Circuit and a method for feeding oil to rolling bearings in a turbomachine |
WO2014082630A1 (en) * | 2012-11-28 | 2014-06-05 | Schaeffler Technologies AG & Co. KG | Camshaft adjusting device and central valve for a camshaft adjusting device |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7082918B2 (en) * | 2003-08-26 | 2006-08-01 | General Motors Corporation | Oil pressure control system and method for engines with hydraulic cylinder deactivation |
US7395802B2 (en) * | 2006-06-07 | 2008-07-08 | Ford Global Technologies, Llc | Oil supply for internal combustion engine camshaft |
US8122862B2 (en) * | 2009-01-26 | 2012-02-28 | GM Global Technology Operations LLC | Engine including cylinder deactivation assembly and method of control |
RU2503877C1 (en) * | 2012-07-17 | 2014-01-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Саратовский государственный технический университет имени Гагарина Ю.А." (СГТУ имени Гагарина Ю.А.) | Supply system of lubricating material to internal combustion engine |
DE102015109802A1 (en) * | 2015-06-18 | 2016-12-22 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Internal combustion engine |
JP6518282B2 (en) * | 2017-03-28 | 2019-05-22 | 株式会社Subaru | Oil supply device |
Citations (5)
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US4512298A (en) * | 1981-12-09 | 1985-04-23 | Nissan Motor Company, Limited | Engine lubricating system |
US5220891A (en) * | 1991-03-15 | 1993-06-22 | Nissan Motor Co., Ltd. | Variable cam engine |
US5704315A (en) * | 1995-08-09 | 1998-01-06 | Honda Giken Kogyo Kabushiki Kaisha | Valve operating system in SOHC-type engine |
US5915348A (en) * | 1996-11-07 | 1999-06-29 | Ina Walzlager Schaeffler Ohg | Adjusting cylinder of a camshaft adjusting device acted upon by a separate oil supply unit |
US6230680B1 (en) * | 2000-02-16 | 2001-05-15 | Thomas A Pirone | High-precision three-valve motorcycle engine lubrication |
Family Cites Families (2)
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JP2001336410A (en) * | 2000-05-24 | 2001-12-07 | Unisia Jecs Corp | Hydraulic oil pipe line for internal combustion engine |
US6484680B2 (en) * | 2001-03-10 | 2002-11-26 | Ford Global Technologies, Inc. | Internal combustion engine with variable cam timing oil filter with restrictor arrangement |
-
2003
- 2003-09-18 US US10/666,864 patent/US6860250B1/en not_active Expired - Fee Related
-
2004
- 2004-09-16 DE DE102004044998A patent/DE102004044998B4/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4512298A (en) * | 1981-12-09 | 1985-04-23 | Nissan Motor Company, Limited | Engine lubricating system |
US5220891A (en) * | 1991-03-15 | 1993-06-22 | Nissan Motor Co., Ltd. | Variable cam engine |
US5704315A (en) * | 1995-08-09 | 1998-01-06 | Honda Giken Kogyo Kabushiki Kaisha | Valve operating system in SOHC-type engine |
US5915348A (en) * | 1996-11-07 | 1999-06-29 | Ina Walzlager Schaeffler Ohg | Adjusting cylinder of a camshaft adjusting device acted upon by a separate oil supply unit |
US6230680B1 (en) * | 2000-02-16 | 2001-05-15 | Thomas A Pirone | High-precision three-valve motorcycle engine lubrication |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090311115A1 (en) * | 2008-06-12 | 2009-12-17 | Aisin Seiki Kabushiki Kaisha | Oil supplying apparatus for vehicle |
US8540055B2 (en) * | 2008-06-12 | 2013-09-24 | Aisin Seiki Kabushiki Kaisha | Oil supplying apparatus for vehicle |
US20120024631A1 (en) * | 2010-05-11 | 2012-02-02 | Snecma | Circuit and a method for feeding oil to rolling bearings in a turbomachine |
US8919499B2 (en) * | 2010-05-11 | 2014-12-30 | Snecma | Circuit and a method for feeding oil to rolling bearings in a turbomachine |
WO2014082630A1 (en) * | 2012-11-28 | 2014-06-05 | Schaeffler Technologies AG & Co. KG | Camshaft adjusting device and central valve for a camshaft adjusting device |
US9598987B2 (en) | 2012-11-28 | 2017-03-21 | Schaeffler Technologies AG & Co. KG | Camshaft adjusting device and central valve for a camshaft adjusting device |
Also Published As
Publication number | Publication date |
---|---|
DE102004044998B4 (en) | 2010-06-02 |
DE102004044998A1 (en) | 2005-04-28 |
US6860250B1 (en) | 2005-03-01 |
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