EP1424470A1 - Lubrication oil passage structure of internal combustion engine - Google Patents

Lubrication oil passage structure of internal combustion engine Download PDF

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Publication number
EP1424470A1
EP1424470A1 EP02762893A EP02762893A EP1424470A1 EP 1424470 A1 EP1424470 A1 EP 1424470A1 EP 02762893 A EP02762893 A EP 02762893A EP 02762893 A EP02762893 A EP 02762893A EP 1424470 A1 EP1424470 A1 EP 1424470A1
Authority
EP
European Patent Office
Prior art keywords
lubricating oil
jet
oil passage
internal combustion
combustion engine
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.)
Granted
Application number
EP02762893A
Other languages
German (de)
French (fr)
Other versions
EP1424470A4 (en
EP1424470B1 (en
Inventor
Takashi K. K. Honda Gijutsu Kenkyusho Ishizaka
Akira K.K. Honda Gijutsu Kenkyusho SHIGIHARA
Takashi K. K. Honda Gijutsu Kenkyusho KANEISHI
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.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
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Filing date
Publication date
Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Publication of EP1424470A1 publication Critical patent/EP1424470A1/en
Publication of EP1424470A4 publication Critical patent/EP1424470A4/en
Application granted granted Critical
Publication of EP1424470B1 publication Critical patent/EP1424470B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • F01M1/00—Pressure lubrication
    • F01M1/08—Lubricating systems characterised by the provision therein of lubricant jetting means
    • 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
    • F01M1/08—Lubricating systems characterised by the provision therein of lubricant jetting means
    • F01M2001/083—Lubricating systems characterised by the provision therein of lubricant jetting means for lubricating cylinders
    • 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
    • F01M1/08—Lubricating systems characterised by the provision therein of lubricant jetting means
    • F01M2001/086—Lubricating systems characterised by the provision therein of lubricant jetting means for lubricating gudgeon pins

Definitions

  • the present invention relates to a lubricating oil passage structure in an internal combustion engine for supplying a lubricating oil to portions to be lubricated in the internal combustion engine.
  • a lubricating oil passage for supplying a pressurized lubricating oil to portions to be lubricated such as rotating and sliding portions of the internal combustion engine is provided, and a constriction passage, i.e., a jet is provided in place in the lubricating oil passage to communicate with the latter, so that the pressurized lubricating oil flowing in the lubricating oil passage is ejected through the jet, and for example, the ejected lubricating oil is supplied to a back side of a piston to lubricate and cool the piston (for example, see Japanese Patent Application Laid-open No.9-209733).
  • the present invention has been accomplished with such circumstances in view, and it is an object of the present invention to provide a new lubricating oil passage structure in an internal combustion engine, wherein the inlet of the jet cannot be occluded by the foreign matter.
  • a lubricating oil passage structure in an internal combustion engine comprising a jet provided in place in a lubricating oil passage leading to an oil pump, so that a pressurized lubricating oil flowing in the lubricating oil passage is ejected toward portions to be lubricated through the jet, characterized in that oil grooves are provided in an inlet of the jet to communicate with the jet, the oil grooves being opened into the lubricating oil passage and extending diametrically from the center of the jet.
  • the inlet of the jet is prevented from being occluded by a foreign matter such as a dust and cuttings incorporated in the lubricating oil, and the lubricating oil can be ejected always in an appropriate amount and under an appropriate pressure from the jet.
  • the oil grooves are cross-shaped grooves extending diametrically about the jet.
  • Fig.1 is a sectional view of essential portions of an internal combustion engine provided with a lubricating oil passage structure according to the present invention
  • Fig. 2 is an enlarged view of a portion surrounded by a phantom circle indicated by an arrow 2 in Fig. 1
  • Fig.3 is a partial view of a portion indicated by an arrow 3 in Fig.2.
  • an engine body E of a 4-cycle internal combustion engine includes a cylinder block 1 having a cylinder bore 2 provided therein, a cylinder head 3 which is fixed onto a deck surface of the cylinder block 1 and in which a combustion chamber 4 is defined to confront the cylinder bore 2, and a crankcase 5 fixed to a lower surface of the cylinder block 1.
  • An oil pan 6 is fixed to a lower surface of the crankcase 5.
  • crankshaft 7 is rotatably carried within the crankcase 5 with a ball bearing 8 interposed therebetween, and a connecting rod 10 is rotatably connected at its larger end to a crankpin 7a of the crankshaft 7 through a needle bearing 11 and at its smaller end to a piston pin 13 of a piston 12 slidably received in the cylinder bore 2.
  • a lubricating system L is provided in the engine body E for lubricating various portions of the engine body E.
  • the lubricating system L is of a conventionally known construction, and a suction passage 16 connected to a suction port of an oil pump 15 connected to the lubricating system L is connected at its lower end to an oil strainer 17 immersed in a lubricating oil stored in the oil pan 6.
  • a discharge passage 18 connected to a discharge port of the oil pump 15 communicates with a main gallery 21 defined as a lubricating oil passage in the cylinder block 1.
  • a piston-lubricating oil passage 24 defined in the crankcase 5 communicate with an intermediate portion of the main gallery 21, and a jet 25 is opened into a wall 24a of the passage 24, which confronts the cylinder bore 2 and the jet 25 has an inlet communicating with the piston-lubricating oil passage 24 and an ejecting outlet directed toward a back side of the piston 12 within the cylinder bore 2.
  • oil grooves 26 are provided at the inlet of the jet 25 to communicate with the inlet of the jet 25, and extend diametrically in a cross-shape about the jet 25, as shown in Fig.3. Sides of the cross-shaped oil groove 26, which confront the piston-lubricating oil passage 24, are opened into the piston-lubricating oil passage 24 over the substantially entire region of the latter.
  • reference character 28 is a lubricating oil passage defined in the crankshaft 7;
  • reference character 29 is a timing transmitting device for operating a valve-operating mechanism (not shown) in operative association with the crankshaft 7;
  • reference character 30 is a gear for driving the oil pump; and
  • reference character 31 is a gear for driving a clutch leading to a transmission.
  • a portion of the pressurized lubricating oil flowing in the main gallery 21 is supplied to the piston-lubricating oil passage 24.
  • the lubricating oil reaching the passage 24 is ejected from the jet 25 directed to the back side of the piston 12 as shown by an arrow a in Figs.1 and 2, and is supplied to the back side of the piston 12 to lubricate and cool the piston 12 and an inner wall surface of the cylinder bore 2.
  • the lubricating oil flowing in the main gallery 21 is filtered by the oil strainer 17, but a portion of a foreign matter R such as a fine dust and fine cuttings may not be filtered off and may be fed through the main gallery 21 to the piston-lubricating oil passage 24.
  • the foreign matter R may occlude a center portion of the inlet of the small-diameter jet 25, as shown by a phantom line in Fig. 2.
  • the pressurized lubricating oil within the piston-lubricating oil passage 24 can be fed under pressure via the oil grooves 26 of the cross shape to the jet 25, as shown by a phantom arrow b in Fig. 2, and can be ejected from the jet 25 toward the back side of the piston 12.
  • the present invention is not limited to the above-described embodiment, and various embodiments may be made within the scope of the invention.
  • the four oil grooves 26 are defined in the cross shape diametrically from the center of the jet 25 in the oil passage provided at the inlet of the jet 25 in the above-described embodiment, one to three or five or more oil grooves may be defined diametrically from the center of the jet 25 in place of the four oil grooves.
  • the lubricating oil passage structure according to the present invention has been described as being carried out in the jet directed to the back side of the piston in the above-described embodiment, but it is of course that the lubricating oil passage structure can be carried out in another jet provided in a lubricating oil passage.

Abstract

In a lubricating oil passage structure in an internal combustion engine in which a pressurized lubricating oil flowing in a lubricating oil passage (21) is ejected to portions to be lubricated through a jet (25) provided in the lubricating oil passage (21), oil groove of a cross shape is provided at an inlet of the jet (25), so that they are opened into the lubricating oil passage (21) and extend diametrically from the center of the jet (25). Thus, it is possible to ensure that the inlet of the jet provided in place in the lubricating oil passage in the internal combustion engine cannot be occluded by cuttings or a dust incorporated in the lubricating oil flowing in the lubricating oil passage. <IMAGE>

Description

FIELD OF THE INVENTION
The present invention relates to a lubricating oil passage structure in an internal combustion engine for supplying a lubricating oil to portions to be lubricated in the internal combustion engine.
BACKGROUND ART
In an internal combustion engine, in general, to guarantee the smooth operation of the internal combustion engine, a lubricating oil passage for supplying a pressurized lubricating oil to portions to be lubricated such as rotating and sliding portions of the internal combustion engine is provided, and a constriction passage, i.e., a jet is provided in place in the lubricating oil passage to communicate with the latter, so that the pressurized lubricating oil flowing in the lubricating oil passage is ejected through the jet, and for example, the ejected lubricating oil is supplied to a back side of a piston to lubricate and cool the piston (for example, see Japanese Patent Application Laid-open No.9-209733).
It should be noted here that even if the lubricating oil filtered by an oil filter flows in the lubricating oil passage, the following problem is encountered: It is inevitable that a foreign matter such as a small amount of a dust and cuttings is incorporated into the lubricating oil. The foreign matter may reach the inlet of the constriction passage, i.e., the jet provided in the lubricating oil passage, thereby occluding the inlet, and in such case, the amount and pressure of lubricating oil ejected from the jet are reduced.
DISCLOSURE OF THE INVENTION
The present invention has been accomplished with such circumstances in view, and it is an object of the present invention to provide a new lubricating oil passage structure in an internal combustion engine, wherein the inlet of the jet cannot be occluded by the foreign matter.
To achieve the above object, according to the present invention, there is provided a lubricating oil passage structure in an internal combustion engine, comprising a jet provided in place in a lubricating oil passage leading to an oil pump, so that a pressurized lubricating oil flowing in the lubricating oil passage is ejected toward portions to be lubricated through the jet,
   characterized in that oil grooves are provided in an inlet of the jet to communicate with the jet, the oil grooves being opened into the lubricating oil passage and extending diametrically from the center of the jet. With such feature, the inlet of the jet is prevented from being occluded by a foreign matter such as a dust and cuttings incorporated in the lubricating oil, and the lubricating oil can be ejected always in an appropriate amount and under an appropriate pressure from the jet.
According to another aspect and feature of the present invention, in addition to the first arrangement, the oil grooves are cross-shaped grooves extending diametrically about the jet. With such feature, the inlet of the jet is prevented further reliably from being occluded by a foreign matter such as a dust and cuttings incorporated in the lubricating oil, and the lubricating oil can be ejected always in an appropriate amount and under an appropriate pressure from the jet.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig.1 is a sectional view of essential portions of an internal combustion engine provided with a lubricating oil passage structure according to the present invention; Fig. 2 is an enlarged view of a portion surrounded by a phantom circle indicated by an arrow 2 in Fig. 1; and Fig.3 is a partial view of a portion indicated by an arrow 3 in Fig.2.
BEST MODE FOR CARRYING OUT THE INVENTION
The mode for carrying out the present invention will now be described by way of an embodiment shown in the accompanying drawings.
First, an embodiment of the present invention will be described with reference to Figs.1 to 3.
Referring to Fig. 1, an engine body E of a 4-cycle internal combustion engine includes a cylinder block 1 having a cylinder bore 2 provided therein, a cylinder head 3 which is fixed onto a deck surface of the cylinder block 1 and in which a combustion chamber 4 is defined to confront the cylinder bore 2, and a crankcase 5 fixed to a lower surface of the cylinder block 1. An oil pan 6 is fixed to a lower surface of the crankcase 5.
As usual, a crankshaft 7 is rotatably carried within the crankcase 5 with a ball bearing 8 interposed therebetween, and a connecting rod 10 is rotatably connected at its larger end to a crankpin 7a of the crankshaft 7 through a needle bearing 11 and at its smaller end to a piston pin 13 of a piston 12 slidably received in the cylinder bore 2.
A lubricating system L is provided in the engine body E for lubricating various portions of the engine body E. The lubricating system L is of a conventionally known construction, and a suction passage 16 connected to a suction port of an oil pump 15 connected to the lubricating system L is connected at its lower end to an oil strainer 17 immersed in a lubricating oil stored in the oil pan 6. A discharge passage 18 connected to a discharge port of the oil pump 15 communicates with a main gallery 21 defined as a lubricating oil passage in the cylinder block 1.
A piston-lubricating oil passage 24 defined in the crankcase 5 communicate with an intermediate portion of the main gallery 21, and a jet 25 is opened into a wall 24a of the passage 24, which confronts the cylinder bore 2 and the jet 25 has an inlet communicating with the piston-lubricating oil passage 24 and an ejecting outlet directed toward a back side of the piston 12 within the cylinder bore 2.
As clearly shown in Figs. 2 and 3, oil grooves 26 according to the present invention are provided at the inlet of the jet 25 to communicate with the inlet of the jet 25, and extend diametrically in a cross-shape about the jet 25, as shown in Fig.3. Sides of the cross-shaped oil groove 26, which confront the piston-lubricating oil passage 24, are opened into the piston-lubricating oil passage 24 over the substantially entire region of the latter.
In Fig.1, reference character 28 is a lubricating oil passage defined in the crankshaft 7; reference character 29 is a timing transmitting device for operating a valve-operating mechanism (not shown) in operative association with the crankshaft 7; reference character 30 is a gear for driving the oil pump; and reference character 31 is a gear for driving a clutch leading to a transmission.
Next, the operation of this embodiment will be described below. If the crankshaft 7 is now rotated by the operation of the internal combustion engine and the oil pump 15 is driven, the lubricating oil within the oil pan 6 is drawn via the oil strainer 17 and fed under pressure to the main gallery 21 defined as the lubricating oil passage in the cylinder block 1.
A portion of the pressurized lubricating oil flowing in the main gallery 21 is supplied to the piston-lubricating oil passage 24. The lubricating oil reaching the passage 24 is ejected from the jet 25 directed to the back side of the piston 12 as shown by an arrow a in Figs.1 and 2, and is supplied to the back side of the piston 12 to lubricate and cool the piston 12 and an inner wall surface of the cylinder bore 2.
The lubricating oil flowing in the main gallery 21 is filtered by the oil strainer 17, but a portion of a foreign matter R such as a fine dust and fine cuttings may not be filtered off and may be fed through the main gallery 21 to the piston-lubricating oil passage 24. The foreign matter R may occlude a center portion of the inlet of the small-diameter jet 25, as shown by a phantom line in Fig. 2. In such case, however, since the oil grooves 26 of the cross shape are provided diametrically at the inlet of the jet 25 to communicate with the inlet of the jet 25 and opened into the piston-lubricating oil passage 24 in the embodiment, the pressurized lubricating oil within the piston-lubricating oil passage 24 can be fed under pressure via the oil grooves 26 of the cross shape to the jet 25, as shown by a phantom arrow b in Fig. 2, and can be ejected from the jet 25 toward the back side of the piston 12.
Although the embodiment of the present invention has been described in detail, it will be understood that the present invention is not limited to the above-described embodiment, and various embodiments may be made within the scope of the invention. For example, although the four oil grooves 26 are defined in the cross shape diametrically from the center of the jet 25 in the oil passage provided at the inlet of the jet 25 in the above-described embodiment, one to three or five or more oil grooves may be defined diametrically from the center of the jet 25 in place of the four oil grooves. In addition, the lubricating oil passage structure according to the present invention has been described as being carried out in the jet directed to the back side of the piston in the above-described embodiment, but it is of course that the lubricating oil passage structure can be carried out in another jet provided in a lubricating oil passage.

Claims (2)

  1. A lubricating oil passage structure in an internal combustion engine, comprising a jet (25) provided in place in a lubricating oil passage (21) leading to an oil pump (15), so that a pressurized lubricating oil flowing in the lubricating oil passage (21) is ejected toward portions to be lubricated through said jet (25),
       characterized in that oil grooves (26) are provided in an inlet of said jet (25) to communicate with said jet (25), said oil grooves (26) being opened into said lubricating oil passage (21) and extending diametrically from the center of said jet (25).
  2. A lubricating oil passage structure in an internal combustion engine according to claim 1, wherein said oil grooves (26) are cross-shaped grooves extending diametrically about said jet (25).
EP02762893A 2001-09-04 2002-08-28 Lubrication oil passage structure of internal combustion engine Expired - Fee Related EP1424470B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2001267586A JP4537629B2 (en) 2001-09-04 2001-09-04 Lubricating oil passage structure of internal combustion engine
JP2001267586 2001-09-04
PCT/JP2002/008677 WO2003023198A1 (en) 2001-09-04 2002-08-28 Lubrication oil passage structure of internal combustion engine

Publications (3)

Publication Number Publication Date
EP1424470A1 true EP1424470A1 (en) 2004-06-02
EP1424470A4 EP1424470A4 (en) 2007-02-14
EP1424470B1 EP1424470B1 (en) 2008-03-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP02762893A Expired - Fee Related EP1424470B1 (en) 2001-09-04 2002-08-28 Lubrication oil passage structure of internal combustion engine

Country Status (9)

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EP (1) EP1424470B1 (en)
JP (1) JP4537629B2 (en)
KR (1) KR100539602B1 (en)
CN (1) CN1277044C (en)
AR (1) AR036397A1 (en)
BR (1) BR0205965B1 (en)
ES (1) ES2302837T3 (en)
MY (1) MY129090A (en)
WO (1) WO2003023198A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007058796A1 (en) * 2007-12-06 2009-06-10 GM Global Technology Operations, Inc., Detroit Automotive engine has an oil-way with a cross section that diverges to an outlet

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103104376B (en) * 2013-02-06 2015-06-10 苏州科瓴精密机械科技有限公司 Carburetor seat of engine
CN103114943B (en) * 2013-02-26 2015-08-12 苏州科瓴精密机械科技有限公司 The carburetor seat of motor
JP6056090B2 (en) * 2013-02-28 2017-01-11 本田技研工業株式会社 Lubricating oil supply structure in vehicle internal combustion engine

Citations (3)

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Publication number Priority date Publication date Assignee Title
DE4323262A1 (en) * 1993-07-12 1995-01-26 Fev Motorentech Gmbh & Co Kg Method and arrangement for supplying lubricant to a reciprocating piston machine
DE19930417A1 (en) * 1998-09-12 2000-04-20 Honda Motor Co Ltd Crankshaft surrounding structure for four-cycle engine of motor vehicle
EP1288460A1 (en) * 2001-08-31 2003-03-05 Honda Giken Kogyo Kabushiki Kaisha Piston cooling device for multicylinder engine

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JPS52168136U (en) * 1976-06-14 1977-12-20
JPS54164328U (en) * 1978-05-11 1979-11-17
JPH01103727U (en) * 1987-12-28 1989-07-13
JPH041408A (en) * 1990-04-13 1992-01-06 Yanmar Diesel Engine Co Ltd Forcibly oiling mechanism of gasoline engine
JPH0968042A (en) * 1995-08-31 1997-03-11 Suzuki Motor Corp Oil injection device for four-cycle engine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4323262A1 (en) * 1993-07-12 1995-01-26 Fev Motorentech Gmbh & Co Kg Method and arrangement for supplying lubricant to a reciprocating piston machine
DE19930417A1 (en) * 1998-09-12 2000-04-20 Honda Motor Co Ltd Crankshaft surrounding structure for four-cycle engine of motor vehicle
EP1288460A1 (en) * 2001-08-31 2003-03-05 Honda Giken Kogyo Kabushiki Kaisha Piston cooling device for multicylinder engine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO03023198A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007058796A1 (en) * 2007-12-06 2009-06-10 GM Global Technology Operations, Inc., Detroit Automotive engine has an oil-way with a cross section that diverges to an outlet

Also Published As

Publication number Publication date
JP4537629B2 (en) 2010-09-01
KR100539602B1 (en) 2005-12-28
EP1424470A4 (en) 2007-02-14
BR0205965B1 (en) 2011-03-09
JP2003074322A (en) 2003-03-12
MY129090A (en) 2007-03-30
EP1424470B1 (en) 2008-03-19
CN1549889A (en) 2004-11-24
BR0205965A (en) 2003-10-07
AR036397A1 (en) 2004-09-08
ES2302837T3 (en) 2008-08-01
KR20040029035A (en) 2004-04-03
WO2003023198A1 (en) 2003-03-20
CN1277044C (en) 2006-09-27

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