EP1640571B1 - Oil supply device for engine - Google Patents

Oil supply device for engine Download PDF

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Publication number
EP1640571B1
EP1640571B1 EP05020471A EP05020471A EP1640571B1 EP 1640571 B1 EP1640571 B1 EP 1640571B1 EP 05020471 A EP05020471 A EP 05020471A EP 05020471 A EP05020471 A EP 05020471A EP 1640571 B1 EP1640571 B1 EP 1640571B1
Authority
EP
European Patent Office
Prior art keywords
oil
pump
system portion
passage
valve
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.)
Expired - Fee Related
Application number
EP05020471A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1640571A1 (en
Inventor
Atsutoshi Ikegawa
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.)
Aisin Corp
Original Assignee
Aisin Seiki Co Ltd
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 Aisin Seiki Co Ltd filed Critical Aisin Seiki Co Ltd
Publication of EP1640571A1 publication Critical patent/EP1640571A1/en
Application granted granted Critical
Publication of EP1640571B1 publication Critical patent/EP1640571B1/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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    • 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
    • F01M1/12—Closed-circuit lubricating systems not provided for in groups F01M1/02 - F01M1/10
    • 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
    • F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
    • F01M5/002—Cooling
    • 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
    • F01M1/12—Closed-circuit lubricating systems not provided for in groups F01M1/02 - F01M1/10
    • F01M2001/123—Closed-circuit lubricating systems not provided for in groups F01M1/02 - F01M1/10 using two or more pumps

Definitions

  • the present invention relates to an oil supply device for an engine. More particularly, the present invention pertains to an oil supply device for an engine, which supplies oil to lubrication system portions and cooling system portions of the engine.
  • a known oil supply device for an engine described in JPH04 (1992)-132414U includes a main oil pump (i.e., a first pump) and a motor driven oil pump (i.e., a second pump).
  • a destination of oil from each pump is changed by appropriately switching oil passages from the both pumps on the basis of engine rotation speed.
  • the first pump and the second pump are arranged in parallel from each other relative to a destination of oil, and oil supplied from the oil pumps is used mainly for hydraulic pressure actuation.
  • a first pump and a second pump are arranged in series relative to a destination of oil.
  • oil sucked from an oil reservoir is discharged by the first pump to the second pump side, and the second pump discharges the oil discharged from the first pump to the destination of the oil.
  • Lubrication system portions such as a cam and a cam chain, which require supply of oil for lubrication and cooling system portions such as a piston, which require supply of oil for cooling require oil supply at engine in addition to the aforementioned portions related to the hydraulic pressure actuation.
  • the both pumps should be high output pumps when it is necessary to supply oil by high pressure relative to the destination of the oil.
  • the second pump cannot suck oil unless the first pump is operated, and thus the second pump cannot supply the oil to the destination of the oil.
  • oil cannot be supplied from the second pump to the destination of the oil until the first pump sufficiently sucks oil and discharge the oil to the second pump at an engine start.
  • the present invention provides an oil supply device for an engine for supplying oil to a lubrication system portion and a cooling system portion of an engine, characterized by a first oil suction passage in communication with an oil reservoir which reserves oil, a second oil suction passage in communication with a second oil reservoir, a first pump for sucking oil from the first oil suction passage by means of rotation of crankshaft of the engine and for discharging the sucked oil, a second pump arranged in series with the first pump for controlling switching On-Off operation, the second pump configured to be supplied with oil discharged from the first pump and introduced from the second oil suction passage for sucking and discharging oil from at least one of the first pump and the second oil suction passage, a check valve for blocking oil circulation from the second pump to the first pump and from the second oil suction passage to the first pump, a first oil passage diverged between the check valve and the first pump and extended to the lubrication system portion, a second oil passage extended from the second pump to the cooling system portion,
  • the supply volume control means can change oil supply volume from the oil pump to the lubrication system portion, to the cooling system portion, or to the lubrication system portion and the cooling system portion in accordance with operational state of the engine, for example, at least one of change of oil temperature of the engine, engine rotation speed, and engine load.
  • the oil pump of the oil supply device includes the first pump for utilizing rotation of the crankshaft of the engine and the second pump which controls to switch operation of the oil supply device.
  • the first pump is configured to output torque to easily discharge oil with relatively high viscosity, and can supply oil to the lubrication system portion even when oil temperature is low and oil viscosity is high.
  • On-Off of the operation of the second pump 2 in accordance with an operational state of the engine, optimum volume of oil can be supplied to the lubrication portion and to the cooling system portion in accordance with operational state of the engine.
  • engine efficiency can be increased by preventing oil supply to unnecessary portion and by supplying appropriate volume of oil to necessary portions.
  • the first valve is provided to block circulation of oil from the first oil passage to the second oil passage.
  • the second pump is arranged in series with the first pump, and is arranged to suck oil discharged from the first pump, oil pressure at suction side of the second pump assumes oil pressure supplied from the first pump, and oil can be sucked with less power than power for sucking oil by the second pump alone. Accordingly, output of the second pump per se can be reduced and the second pump can be reduced in size.
  • the second pump can output oil discharged from the first pump by further increasing the pressure with less power, and thus, it is advantageous when the second pump supplies oil to a destination of the oil such as an oil jet which requires large volume and high pressured oil.
  • the second pump alone can suck oil from the second oil suction passage even when oil is not filled up in the first pump and piping because the first pump has not sufficiently sucked oil discharged from the first pump through the first oil suction passage, for example, at immediately after the engine start.
  • Fig. 1 is a schematic diagram of an oil supply device according to a first embodiment of the present invention.
  • Fig. 2 is a partial schematic diagram of an oil supply device according to a second embodiment of the present invention.
  • Fig. 3 is a partial schematic diagram of an oil supply device according to a third embodiment of the present invention.
  • Fig. 4 is a partial schematic diagram of an oil supply device according to a fourth embodiment of the present invention.
  • Fig. 5 is a partial schematic diagram of an oil supply device according to a fifth embodiment of the present invention.
  • Fig. 6 is a partial schematic diagram of an oil supply device according to a sixth embodiment of the present invention.
  • Fig. 7 is a partial schematic diagram of an oil supply device according to a seventh embodiment of the present invention.
  • an oil supply device for an engine includes an oil supply circuit which includes a lubrication system portion 10 where oil for lubrication is supplied in the engine and a cooling system portion 11 where the oil for cooling is supplied.
  • the lubrication system portion 10 includes a cam shower for showering oil for lubrication to a cam, and a chain jet for jetting oil for oil to a cam chain, or the like.
  • the cooling system portion 11, for example, includes a piston jet for jetting cooling oil to a piston.
  • the oil supply circuit oil is supplied to the lubrication system portion 10 and the cooling system portion 11 from either a first oil reservoir 3 or a second oil reservoir 4. More particularly, the oil supply circuit includes a first pump 1 and a second pump 2 for discharging oil to the lubrication system portion 10 and the cooling system portion 11 by sucking oil from the first oil reservoir 3 and the second oil reservoir 4. As shown in Fig. 1, in order to promptly supply the oil to the second pump 2, it is preferable that the second oil reservoir 4 provided separately from the first oil reservoir 3 is arranged in the vicinity of the second pump 2. However, the first oil reservoir 3 and the second oil reservoir 4 may be provided unitarily.
  • a mechanical oil pump driven by rotation of a crankshaft of an engine serves as the first pump 1.
  • An electric oil pump whose output oil volume and ON-OFF operation are controlled by controlling actuation of a motor M serves as the second pump 2.
  • discharged volume of oil at the first pump 1 can be compensated by operating the second pump when the first pump is not sufficiently functioned, for example, at immediately after the engine start. Further, oil can be supplied to the lubrication portion 10 by operating the second pump 2 even before the engine start.
  • the second pump allows to set the first pump to have less oil discharging performance. Accordingly, the first pump, which is the mechanical oil pump, is reduced in size and friction of the engine can be declined.
  • the first pump 1 is connected to a first oil suction passage 18 for sucking oil from the first oil reservoir 3, and the oil sucked from the first oil reservoir 3 is discharged from the first pump 1 to flow in a first oil filter 8.
  • the oil passes through the first oil filter 8 so that foreign materials are removed from the oil and is supplied to the lubrication system portion 10 through the first oil passage 5.
  • the second pump 2 is actuated, the oil which has passed through the first oil filter 8 is sucked to be introduced to a second oil passage 6, and is discharged from the second pump 2 to flow in the second oil filter 9.
  • the oil passes through the second oil filter 9 so that foreign materials are removed from the oil and is supplied to the cooling system portion 11 or to the cooling system portion 11 and the lubrication system portion 10 through the second oil passage 6.
  • the second pump 2 sucks the oil which has passed through the first oil filter 8 to discharge to the second oil passage 6 when the first pump 1 is actuated.
  • the second pump 2 pumps oil from the first oil reservoir 3 through the first pump 1.
  • oil is sucked from the second oil reservoir 4 which is provided separately from the first oil reservoir 3 through a second oil suction passage 19.
  • the oil supply device includes a check valve 13 provided at the first pump 1 side relative to a connecting point between the second oil passage 6 and the second oil suction passage 19 in order to prevent oil sucked by the second oil pump 2 from flowing in reverse to the first pump 1 side. Further, the oil supply device also includes a check valve 12 on the second oil suction passage 19 in order to prevent the oil supplied from the first pump 1 to the second pump 2 from flowing in reverse to the second oil reservoir 4 side. With the construction of the embodiment of the present invention, the second pump 2 can compensate the first pump 1 at any timing.
  • the second pump 2 can be reduced in size and the output from the second pump per se can be reduced.
  • the construction of the embodiment of the present invention is particularly advantageous for a case where the second pump 2 supplies oil to the cooling system portion 11 such as the oil jet where large volume and high pressured oil is required to be supplied.
  • first oil suction passage 18 and the second oil suction passage 19 are arranged in parallel each other relative to the second pump 2, oil introduced from the first oil suction passage 18 and discharged from the first pump 1 and oil introduced from the second oil suction passage 19 is supplied to the second pump 2. Accordingly, for example, the second pump 2 alone can suck the oil from the second oil suction passage 19 provided in parallel to the first oil suction passage 18 to discharge appropriate volume of oil even when the first pump 1 is not filled up with the oil because the first pump 1 has not sufficiently sucked oil from the first oil suction passage 18, for example, at immediately after the engine start.
  • oil filters may be provided at an end portion of the first oil suction passage 18 for sucking the oil from the first oil reservoir 3 and at an end portion of the second oil suction passage 19 for sucking the oil from the second oil reservoir 4.
  • a third oil passage 7 for establishing the communication between the first oil passage 5 extended from the first pump 1 to the lubrication system portion 10 and the second oil passage 6 extended from the second pump 2 to the cooling system portion 11 is provided between the first oil passage 5 and the second oil passage 6.
  • a first valve 14 e.g., a check valve
  • a second valve 16 for allowing oil circulation only towards the lubrication system portion 10 is provided on the first oil passage 5 at upstream side relative to a connection point between the first oil passage 5 and the third oil passage 7.
  • a third valve 17 (e.g., stop valve) is provided on the first oil passage5 at downstream side of a connection point of the first oil passages 5 and the third oil passage 7 for allowing oil circulation when oil pressure is lower than a predetermined pressure and oil temperature is lower than a predetermined temperature and for stopping oil circulation when oil pressure is equal to or higher than a predetermined pressure and oil temperatures is equal to or lower than a predetermined temperature.
  • a predetermined temperature and a predetermined pressure are determined in accordance with engine characteristics and parts of the engine, or the like.
  • a fourth oil passage 20 is diverged from the first oil passage 5 at upstream side relative to the second valve 16 for supplying oil to other portions such as a crankshaft bearing portion and a camshaft bearing portion, or the like.
  • a fourth valve 15 which adjusts oil volume to the cooling system portion 11 is provide on the second oil passage 6 at downstream side of a connection point between the second oil passage 6 and the third oil passage 7.
  • opening degree of the fourth valve 4 By controlling opening degree of the fourth valve 4, a destination and volume of oil to be supplied, the oil being discharged from the second pump 2 and circulated in the second oil passage 6 can be controlled.
  • oil which is discharged from the second pump 2 and circulated in the second oil passage 6 is supplied only to the lubrication system portion 10 through the third oil passage 7 when the fourth valve 15 is closed.
  • the fourth valve 15 When the fourth valve 15 is open, oil can be distributed to the lubrication system portion 10 and the cooling system portion 11.
  • the oil supply device includes an electronic control unit (ECU) 21 for detecting and outputting control signal of an engine rotation speed, a load signal of an engine, an engine oil temperature, and a water temperature of cooling water.
  • ECU 21 for detecting and outputting control signal of an engine rotation speed, a load signal of an engine, an engine oil temperature, and a water temperature of cooling water.
  • Control signal from the ECU 21 is transmitted to the motor M and the fourth valve 15, and operation of the motor M and opening degree of the fourth valve 15 are controlled.
  • the ECU 21 serving as a supply volume control means conducts a supply volume changing control for changing oil supply volume from the second pump 2 to the lubrication system portion 10, to the cooling system portion 11, or to the lubrication system portion 10 and the cooling system portion 11 in accordance with changes of at least one of engine oil temperature, engine rotation speed, and engine load.
  • a control for opening degree of the fourth valve 15 and a control for the operation of the motor M by the ECU 21 will be explained as follows.
  • Oil supply to the cooling system portion is, first, explained with reference to Table 1.
  • oil for cooling is not supplied to the cooling system portion 11 in order to avoid needless cooling of the cooling system portion 11 (i.e., corresponding to A and C in Table 1).
  • the oil is supplied to the lubrication system portion 10 through the first oil passage 5 from the first pump 1, the oil is not supplied to the cooling system portion 11 from the first oil passage 5 through the third oil passage 7 because of the first valve 14 provided at the third oil passage 7.
  • the cooling system portion 11 exposed to thermally severe environment is cooled (corresponding to D in Table 1). Because the viscosity of oil is low, in this case, the ECU 21 supplies oil to the cooling system portion 11 by the second pump 2 which can control operation of the oil supply device and discharged oil volume, and sets the fourth valve 15 at a predetermined opening degree. Thresholds for the engine rotation speed and engine load when the second pump 2 is operated is set in accordance with an engine characteristics and characteristics of engine parts.
  • the ECU 21 supplies oil to the lubrication system portion 10 by the first pump 1 which is a mechanical oil pump which enables to output larger torque and not by the second pump 2 which is an electric oil pump considering high viscosity of the oil.
  • oil viscosity assumes lower and spattered volume of oil (amount of oil mist) is increased, in this case, accordingly, it is not necessary to supply oil for lubrication to the lubrication system portion 10 (i.e., corresponding to H in Table 1).
  • the ECU 21 serving as a supply volume control means conducts a supply volume change control for increasing oil supply to the cooling system portion 11 in accordance with an increase of engine load and engine rotation speed (i.e., corresponding to D in Table 1).
  • the ECU 21 operates the motor M to operate the second pump 2 (e.g., the electric oil pump) to circulate oil to the second oil passage 6.
  • the third valve (stop valve) 17 is closed to stop oil supply to the lubrication system portion 10. Accordingly, oil for cooling is selectively supplied to the cooling system portion 11 to cool the cooling system portion 11.
  • the ECU 21 conducts a supply volume change control for reducing oil supply volume to the lubrication system portion 10 in accordance with an increase of an engine rotation speed and engine load. More particularly, when, for example, engine rotation speed and engine load are small at a state where an engine oil temperature is equal to or higher than a predetermined temperature, the ECU 21 supplies oil to the lubrication system portion 10 by operating the second pump 2 serving as the electric oil pump. When engine rotation speed and engine load are increased at a state where an engine oil temperature is equal to or higher than a predetermined temperature, the ECU 21 conducts a control for reducing oil supply volume to the lubrication system portion 10 by closing the third valve 17.
  • a second embodiment of the present invention will be explained as follows.
  • the first valve 14 i.e., check valve
  • the second valve 16 i.e., check valve
  • the third valve 17 i.e., stop valve
  • a third valve 27 may be provided instead of the stop valve.
  • the ECU 21 commands to open the third valve 27 when supplying oil for lubrication to the lubrication system portion 10 by the first pump 1 and when supplying oil for lubrication to the lubrication system portion 10 by the second pump 2. Further, the ECU 21 commands to close the third valve 27 and to open the fourth valve 15 so that oil is not supplied to the lubrication system portion 10 when supplying oil for cooling only to the cooling system portion 11 by the second pump 2.
  • Other construction of the oil supply device according to the second embodiment is common to the first embodiment, and thus explanation thereof is not repeated.
  • a third valve 27 i.e., a opening and closing valve
  • a third valve 27 is provided on the first oil passage 5 at the upstream side of the connection point between the first oil passage 5 and the third oil passage 7 instead of the check valve
  • a third valve 27 i.e., opening and closing valve
  • the first valve 14 shown in Fig. 1 is not provided.
  • the ECU 21 commands to open the second valve 26 and the third valve 27 and to close the fourth valve 15 for supplying oil for lubrication only to the lubrication system portion 10 by the first pump 1.
  • the ECU 21 commands to open the third valve 27 and to close the fourth valve 15 and the second valve 26 for supplying oil only to the lubrication system portion 10 by the second pump 2.
  • the ECU 21 commands to open the fourth valve 15 and to close the second valve 26 and the third valve 27 for supplying oil for cooling only to the cooling system portion 11 by the second pump 2.
  • the ECU 21 also commands to close the second valve 26 and to open the fourth valve 15 and the third valve 27 for supplying oil for lubrication to the lubrication system portion 10 by the second pump 2 and for supplying oil for cooling to the cooling system portion 11.
  • oil supply volume to the lubrication system portion 10 and the cooling system portion 11 can be optimally adjusted in accordance with operational state of the engine.
  • Other construction of the oil supply device according to the third embodiment is common to the first embodiment, and thus explanation thereof is not repeated.
  • a fourth embodiment of the present invention will be explained as follows.
  • the first valve 14 shown in Fig. 1 is not provided on the third oil passage 7.
  • the ECU 21 commands to close the fourth valve 15 when supplying oil for lubrication only to the lubrication system portion 10 using either the both of the first pump 1 and the second pump 2 or either one of the first pump 1 or the second pump 2.
  • Other construction of the oil supply device according to the fourth embodiment is common to the first embodiment, and thus explanation thereof is not repeated.
  • a fifth embodiment of the present invention will be explained as follows.
  • the third valve 27 i.e., opening and closing valve
  • the first valve 14 is not provided on the third oil passage 7.
  • oil can be circulated freely between the first oil passage 5 and the second oil passage 6. Accordingly, oil volume supplied to the lubrication system portion 10 and the cooling system portion 11 is controlled by constantly adjusting the third valve 27 and the fourth valve 15.
  • the ECU 21 commands to open the third valve 27 and to close the fourth valve 15 when supplying oil for lubrication only to the lubrication system portion 10 using either the both of the first pump 1 and the second pump 2 or either one of the first pump 1 or the second pump 2. Further, when supplying oil for cooling only to the cooling system portion 11, the fourth valve 15 is opened and the third valve 27 is closed. When supplying oil to the lubrication system portion 10 and the cooling system portion 11, opening degree of the fourth valve 15 and the third valve 27 are adjusted.
  • a sixth embodiment of the present invention will be explained with reference to Fig. 6 as follows.
  • plural check valves and stop valves applied in the first embodiment for supplying oil are replaced with a oil passage switching valve 30 operated by the oil pressure.
  • the number of parts can be reduced.
  • Operation of the oil supply device according to the sixth embodiment of the present invention is as follows. First, when the ECU 21 stops the second pump 2, operational oil is supplied to the lubrication system portion 10 from the first pump 1. The ECU 21 operates the second pump 2 with low pressure where oil discharged at low pressure when engine rotation speed is low and an engine oil temperature is high.
  • oil pressure from the second pump 2 affects an oil pressure actuation portion 33, and moves a spool valve biased by the spring 32 to the left of Fig. 6, and operation oil from the second pump 2 is supplied to the lubrication system portion 10.
  • the ECU 21 operates the second pump 2 with high pressure when an engine rotation speed is high and an engine oil temperature is high. Accordingly, when the second pump 2 operates to discharge high pressured oil, an adjusting pressure valve 31 is closed at a state where the spool valve is moved to the left in Fig. 6 by the oil pressure from the second pump 2, and operational oil from the second pump 2 is supplied to the cooling system portion 11.
  • Other construction of the oil supply device according to the sixth embodiment is common to the first embodiment, and thus explanation thereof is not repeated.
  • a seventh embodiment of the present invention will be explained with reference to Fig. 7.
  • the oil pressure actuation portion 33 according to the sixth embodiment is replaced with a shape memory spring 43.
  • An operation of the oil supply device according to the seventh embodiment of the present invention is as follows. First, when the ECU 21 stops the second pump 2, operational oil is supplied from the first pump 1 to the lubrication system portion 10. The ECU 21 operates the second pump 2 with low pressure for discharging oil when engine rotation speed is low and an engine oil temperature is high. As a result, the shape memory spring 43 is expanded by oil temperature of the operational oil, the spool valve biased by a spring 32 is moved to the left in Fig. 7, and operational oil from the second pump 2 is supplied to the lubrication system portion 10.
  • the ECU 21 operates the second pump 2 with high pressure to discharge high-pressured oil when engine rotation speed is high and an engine oil temperature is high. Accordingly, when the second pump 2 is operated at high pressure, because the shape memory spring 43 is expanded at the spool valve, the adjusting pressure valve 31 is closed at a state where the spool valve is moved to the left by the oil pressure from the second pump 2, and operational oil from the second pump 2 is supplied to the cooling system portion 11.
  • the supply volume control means can change oil supply volume from the oil pump to the lubrication system portion, to the cooling system portion, or to the lubrication system portion and the cooling system portion in accordance with operational state of the engine, for example, at least one of change of oil temperature of the engine, engine rotation speed, and engine load.
  • the oil pump of the oil supply device includes the first pump for utilizing rotation of the crankshaft of the engine and the second pump which controls to switch operation of the oil supply device.
  • the first pump is configured to output torque to easily discharge oil with relatively high viscosity, and can supply oil to the lubrication system portion even when oil temperature is low and oil viscosity is high.
  • On-Off of the operation of the second pump 2 in accordance with an operational state of the engine, optimum volume of oil can be supplied to the lubrication portion and to the cooling system portion in accordance with operational state of the engine.
  • engine efficiency can be increased by preventing oil supply to unnecessary portion and by supplying appropriate volume of oil to necessary portions.
  • the first valve is provided to block circulation of oil from the first oil passage to the second oil passage.
  • the cooling portion is a piston
  • a piston bore is not unnecessarily cooled. Accordingly, because warm-up of the engine at the start of the engine is promoted and engine friction is declined promptly, fuel injection volume is reduced, and thus and engine with high thermal efficiency which improves mileage can be obtained.
  • the second pump is arranged in series with the first pump, and is arranged to suck oil discharged from the first pump, oil pressure at suction side of the second pump assumes oil pressure supplied from the first pump, and oil can be sucked with less power than power for sucking oil by the second pump alone. Accordingly, output of the second pump per se can be reduced and the second pump can be reduced in size.
  • the second pump can output oil discharged from the first pump by further increasing the pressure with less power, and thus, it is advantageous when the second pump supplies oil to a destination of the oil such as an oil jet which requires large volume and high pressured oil.
  • the second pump alone can suck oil from the second oil suction passage even when oil is not filled up in the first pump and piping because the first pump has not sufficiently sucked oil discharged from the first pump through the first oil suction passage, for example, at immediately after the engine start.
  • the third valve configured to close when pressure of oil discharged from the first pump or the second pump is increased to be equal to or higher than a predetermined pressure is provided at downstream side relative to the connection point between the first oil passage and the third oil passage.
  • volume of oil to be supplied and a destination of oil to be supplied which has discharged from the second pump and circulated in the second oil passage can be controlled.
  • oil discharged from the second pump and circulated in the second oil passage is supplied only to the lubrication system portion through the third oil passage when the fourth valve is closed.
  • the fourth valve When the fourth valve is open, oil discharged from the second pump and circulated in the second oil passage is distributed to the lubrication system portion and the cooling system portion. Accordingly, by controlling opening degree of the fourth valve, oil volume supplied to the lubrication system portion and oil volume supplied to the cooling system portion can be controlled.
  • the ECU 21 i.e., supply volume control means
  • the ECU 21 may control an opening degree of the fourth valve and opening and closing of the second and the third valves or may control an opening degree of the fourth valve and opening and closing of the third valve.
EP05020471A 2004-09-28 2005-09-20 Oil supply device for engine Expired - Fee Related EP1640571B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2004281908A JP2006097491A (ja) 2004-09-28 2004-09-28 エンジンのオイル供給装置

Publications (2)

Publication Number Publication Date
EP1640571A1 EP1640571A1 (en) 2006-03-29
EP1640571B1 true EP1640571B1 (en) 2007-08-22

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EP05020471A Expired - Fee Related EP1640571B1 (en) 2004-09-28 2005-09-20 Oil supply device for engine

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US (1) US20060065217A1 (ja)
EP (1) EP1640571B1 (ja)
JP (1) JP2006097491A (ja)
DE (1) DE602005002103D1 (ja)

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US20060065217A1 (en) 2006-03-30

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