GB2100354A - An internal-combustion engine oil pump - Google Patents

An internal-combustion engine oil pump Download PDF

Info

Publication number
GB2100354A
GB2100354A GB8217296A GB8217296A GB2100354A GB 2100354 A GB2100354 A GB 2100354A GB 8217296 A GB8217296 A GB 8217296A GB 8217296 A GB8217296 A GB 8217296A GB 2100354 A GB2100354 A GB 2100354A
Authority
GB
United Kingdom
Prior art keywords
oil pump
rotor
pump
outer rotor
drive shaft
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.)
Withdrawn
Application number
GB8217296A
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.)
Subaru Corp
Original Assignee
Fuji Heavy Industries 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 Fuji Heavy Industries Ltd filed Critical Fuji Heavy Industries Ltd
Publication of GB2100354A publication Critical patent/GB2100354A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/102—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member the two members rotating simultaneously around their respective axes
    • 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
    • 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
    • F02B67/04—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 mechanically-driven auxiliary apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
    • F04C15/0061—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
    • 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
    • F01M2001/0207—Pressure lubrication using lubricating pumps characterised by the type of pump
    • F01M2001/0238—Rotary 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
    • F01M1/02—Pressure lubrication using lubricating pumps
    • F01M2001/0253—Pressure lubrication using lubricating pumps characterised by the pump driving means
    • F01M2001/0269—Pressure lubrication using lubricating pumps characterised by the pump driving means driven by the crankshaft

Abstract

In an internal-combustion engine a pump drive shaft 11 is connected to the crankshaft 25 and has a large diameter portion 11a supported by a bearing 13 in a crankcase 12. An internally-toothed outer rotor 14 of the pump is secured within the large diameter portion 11a. An externally- toothed inner rotor 15 of the pump meshes with the outer rotor and is supported by eg a shaft 19, at a position which is eccentric relative to the centre of the outer rotor, said rotors being of the gerotor type. Oil is drawn into the pump through an inlet 20 and expelled through an outlet 21 by the rotors. <IMAGE>

Description

SPECIFICATION An oil pump for an internal combustion engine The present invention relates to an oil pump for an internal combustion engine, and to a rotor-type oil pump.
A conventional rotor-type oil pump requires a large installation space and has a complicated structure as, for example, shown in figures 1 and 2.
Referring to Fig. 1 a conventional rotor-type (trochoid) oil pump has a drive shaft 1 connected to a crankshaft (not shown) of an engine and is rotatably supported in a wall 2 of a crankcase by a bearing 3. A pump casing 4 is secured to the wall 2 at the outside thereof. An oil pump shaft 6 coupled to the drive shaft 1 is rotatably mounted in the pump casing 4. An inner rotor 7 is securely mounted on the oil pump shaft 6. An outer rotor 8 is rotatably mounted within the pump casing 4 and a pump cover 5 is secured to the casing 4 to retain the rotors 7 and 8. As shown in Fig. 2, the inner rotor 7 has four teeth 7a, while the outer rotor 8 has five internal indentations 8a for cooperating engagement with the four teeth of the inner rotor 7. The centre C of the outer rotor 8 is eccentric with respect to the centre of the inner rotor 7.In the pump casing 4, an inlet 23 and outlet 24 are provided adjacent the inner and outer rotors 7, 8.
An oil pump of this type occupies a large space in both axial and radial directions, because the pump has a separate structure, and moreover, the pump is complicated in construction. Further, the discharge performance is not sufficient in delivery rate considering its large construction.
In order to improve on such an oil pump, it has been proposed, e.g. Japanese Utility Model Application Publication No. 50-156626, to provide an oil pump which has a pump case provided in a crankcase of an engine. However, the pump of this type is no better in delivery rate than the pump of Fig. 1.
The present invenion seeks to overcome the above described disadvantages of the prior art and to provide a rotor-type oil pump requiring a small installation space, which has a simple construction and, in addition, provides a high delivery rate.
According to the present invention, there is provided an oil pump for an internal combustion engine which has a crankcase, comprising: a drive shaft operatively connected to the engine; the drive shaft terminating in a portion of increased diameter which is rotatably supported in a wall of the crankcase and is provided with a recess in the end thereof; an annular outer rotor secured within the recess coaxial with the drive shaft, and provided with a plurality of internal indentations; an inner rotor rotatably supported at a position eccentric to the outer rotor, and having a plurality of teeth for engagement with the identations of the outer rotor, the number of teeth being one less than the number of indentations; a casing secured to the crankcase for sealing the outer and inner rotors; and an inlet and an outlet for the oil provided adjacent the outer and inner rotors.
A preferred embodiment of the invention will now be described, by way of example and with reference to the accompanying drawings, in which: Fig. 1 is a sectional view of a conventional rotor-type oil pump; Fig. 2 is an illustration showing an inner rotor and an outer rotor of the conventional oil pump; Fig. 3 is a sectional view showing a rotor-type oil pump according to the preferred embodiment of the present invention; and Fig. 4 is an illustration showing an inner rotor and outer rotor of the preferred embodiment.
Referring to Figures 3 and 4 of the drawings, an oil pump includes a drive shaft 11 connected to a crankshaft or cam shaft 25 of an engine 26, and terminating in a large diameter annular portion 11 a having a recess 11 b in the end thereof. The recess defines a cylindrical inner surface. The annular portion 11 a is rotatably supported in a crankcase 12 by a bearing 1 3. An outer rotor 14 is engaged and secured within the recess 11 b, for example by being a force fit within the recess. The outer rotor 14 is coaxial with the drive shaft 11. The inner rotor 1 5 is rotatably mounted on a shaft 19 secured in a bore 22 of a pump casing 1 7 and the rotational axis of the inner rotor 1 5 is eccentric with respect to the axis of the outer rotor 14.The outer rotor 14 has five internal indentations 14a, while the inner rotor 1 5 has four teeth 15a.
The pump casing 1 7 is fastened to the crankcase 12 by bolts 18, and packing 1 6 is interposed between the pump casing and crankcase. An inlet 20 and outlet 21 are formed in the pump casing 17. The inlet 20 is located at a position where the space between the indentations 1 4a and the teeth 1 5a becomes larger and the outlet 21 is at a position where the space becomes smaller.
In operation, the outer rotor 14 rotates together with the drive shaft 11 and the inner rotor 1 5 is rotated by the outer rotor. Oil is drawn into the space between the outer 14 and the inner rotor 1 5 from the inlet 20 by expansion of the space between the indentations 1 4a and teeth 1 5a and is discharged through the outlet 21 by contraction of that space.
Since the outer rotor is driven by the drive shaft and the inner rotor is driven by the outer rotor, the delivery rate of the oil pump having five indentations in the outer rotor is 1.25 (5/4) times as large as the conventional oil pump of Fig. 1 in which the outer rotor is driven by the inner rotor.
In addition, since the large diameter annular portion 11 a, outer rotor 14 and inner rotor 1 5 are built in the wall of the crankcase 12, the oil pump is small in size compared with the conventional oil pump of Fig. 1. The oil pump of the preferred embodiment of the present invention also has a small number of parts than the conventional oil pump.
From the foregoing, it will be understood that the present invention provides an oil pump which may be installed within a small space, which has a large delivery rate, a simple construction and a small number of parts.

Claims (5)

Claims
1. An oil pump for an internal combustion engine which has a crankcase, comprising: a drive shaft operatively connected to the engine; the drive shaft terminating in a portion of increased diameter which is rotatably supported in a wall of the crankcase and is provided with a recess in the end thereof; an annular outer rotor secured within the recess coaxial with the drive shaft, and provided with a plurality of internal indentations; an inner rotor rotatably supported at a position eccentric to the outer rotor, and having a plurality of teeth for engagement with the indentations of the outer rotor, the number of teeth being one less than the number of indentations; a casing secured to the crankcase for sealing the outer and inner rotors; and an inlet and outlet for the oil provided adjacent the outer and inner rotors.
2. An oil pump as claimed in claim 1 wherein the drive shaft is operatively connected to the crankshaft of the engine.
3. An oil pump as claimed in claim 1 or 2 wherein the inner rotor is rotatably supported by a shaft secured to the casing.
4. An oil pump as claimed in any preceding claim wherein the inlet and outlet are formed in the casing.
5. An oil pump for an internal combustion engine substantially as herein described with reference to figures 3 and 4 of the accompanying drawings.
GB8217296A 1981-06-16 1982-06-15 An internal-combustion engine oil pump Withdrawn GB2100354A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8911481U JPS6029604Y2 (en) 1981-06-16 1981-06-16 Internal combustion engine lubricating oil pump

Publications (1)

Publication Number Publication Date
GB2100354A true GB2100354A (en) 1982-12-22

Family

ID=13961861

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8217296A Withdrawn GB2100354A (en) 1981-06-16 1982-06-15 An internal-combustion engine oil pump

Country Status (2)

Country Link
JP (1) JPS6029604Y2 (en)
GB (1) GB2100354A (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0282358A2 (en) * 1987-03-12 1988-09-14 Parker Hannifin Corporation Improved inlet for a positive displacement pump
GB2223275A (en) * 1988-09-28 1990-04-04 Concentric Pumps Ltd Gerotor pumps
EP0405118A1 (en) * 1989-06-29 1991-01-02 Klöckner-Humboldt-Deutz Aktiengesellschaft Rotary fuel pump
AU617002B2 (en) * 1988-09-28 1991-11-14 Concentric Pumps Limited Improvements relating to gerotor pumps
EP0467571A1 (en) * 1990-07-11 1992-01-22 Concentric Pumps Limited Improvements in gerotor pumps
EP0517014A1 (en) * 1991-06-07 1992-12-09 Schwäbische Hüttenwerke Gesellschaft mit beschränkter Haftung Lubrication gear pump for internal combustion engines, especially for vehicles
WO2005017360A1 (en) * 2003-08-18 2005-02-24 Robert Bosch Gmbh Low-pressure pump for the fuel injection system of an internal combustion engine
FR2879650A1 (en) * 2004-12-21 2006-06-23 Renault Sas Oil pump arrangement for e.g. motor vehicle internal combustion engine, has pumping pinions positioned partially in housing hollowed around opening of crankcase, along engine direction, and in crankcase and bearing cap fixed under cap
CN103307430A (en) * 2013-06-28 2013-09-18 力帆实业(集团)股份有限公司 Rotor-type oil pump mounted on crankcase body
DE102013113757A1 (en) * 2013-12-10 2015-06-11 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Arrangement in a lubricating oil circuit of an internal combustion engine for pumping lubricating oil
WO2015104530A1 (en) * 2014-01-07 2015-07-16 Perkins Engines Company Limited Gerotor pump assembly, an engine fluid delivery system using a gerotor pump assembly and miscellaneous components therefor
CN107091271A (en) * 2016-02-17 2017-08-25 福特环球技术公司 Bent axle
CN108462308A (en) * 2018-03-22 2018-08-28 台州奕翔机电有限公司 A kind of electric direct-drive plunger pump
DE102016213611B4 (en) 2016-07-25 2022-12-01 Zf Friedrichshafen Ag Rotor pump and arrangement for driving a rotor pump

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010065987A (en) * 1999-12-31 2001-07-11 이계안 Combination apparatus of oil pump

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0282358A3 (en) * 1987-03-12 1990-02-07 Parker Hannifin Corporation Improved inlet for a positive displacement pump
EP0282358A2 (en) * 1987-03-12 1988-09-14 Parker Hannifin Corporation Improved inlet for a positive displacement pump
GB2223275A (en) * 1988-09-28 1990-04-04 Concentric Pumps Ltd Gerotor pumps
AU617002B2 (en) * 1988-09-28 1991-11-14 Concentric Pumps Limited Improvements relating to gerotor pumps
GB2223275B (en) * 1988-09-28 1993-03-31 Concentric Pumps Ltd Improvements relating to gerotor pumps
EP0405118A1 (en) * 1989-06-29 1991-01-02 Klöckner-Humboldt-Deutz Aktiengesellschaft Rotary fuel pump
AU640031B2 (en) * 1990-07-11 1993-08-12 Concentric Pumps Limited Improvements in gerotor pumps
EP0467571A1 (en) * 1990-07-11 1992-01-22 Concentric Pumps Limited Improvements in gerotor pumps
WO1992001161A1 (en) * 1990-07-11 1992-01-23 Concentric Pumps Limited Improvements in gerotor pumps
US5395217A (en) * 1991-06-07 1995-03-07 Schwabische Huttenwerke Gmbh Gear pump for oil for an internal-combustion engine, in particular for motor vehicles
EP0517014A1 (en) * 1991-06-07 1992-12-09 Schwäbische Hüttenwerke Gesellschaft mit beschränkter Haftung Lubrication gear pump for internal combustion engines, especially for vehicles
WO2005017360A1 (en) * 2003-08-18 2005-02-24 Robert Bosch Gmbh Low-pressure pump for the fuel injection system of an internal combustion engine
FR2879650A1 (en) * 2004-12-21 2006-06-23 Renault Sas Oil pump arrangement for e.g. motor vehicle internal combustion engine, has pumping pinions positioned partially in housing hollowed around opening of crankcase, along engine direction, and in crankcase and bearing cap fixed under cap
EP1674676A3 (en) * 2004-12-21 2010-05-19 Renault s.a.s. Oil pump arrangement
CN103307430A (en) * 2013-06-28 2013-09-18 力帆实业(集团)股份有限公司 Rotor-type oil pump mounted on crankcase body
DE102013113757A1 (en) * 2013-12-10 2015-06-11 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Arrangement in a lubricating oil circuit of an internal combustion engine for pumping lubricating oil
WO2015104530A1 (en) * 2014-01-07 2015-07-16 Perkins Engines Company Limited Gerotor pump assembly, an engine fluid delivery system using a gerotor pump assembly and miscellaneous components therefor
CN107091271A (en) * 2016-02-17 2017-08-25 福特环球技术公司 Bent axle
CN107091271B (en) * 2016-02-17 2021-06-18 福特环球技术公司 Crankshaft
DE102016213611B4 (en) 2016-07-25 2022-12-01 Zf Friedrichshafen Ag Rotor pump and arrangement for driving a rotor pump
CN108462308A (en) * 2018-03-22 2018-08-28 台州奕翔机电有限公司 A kind of electric direct-drive plunger pump

Also Published As

Publication number Publication date
JPS6029604Y2 (en) 1985-09-06
JPS57200605U (en) 1982-12-20

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)