EP2868927A1 - Multistage oil pump - Google Patents
Multistage oil pump Download PDFInfo
- Publication number
- EP2868927A1 EP2868927A1 EP20130791598 EP13791598A EP2868927A1 EP 2868927 A1 EP2868927 A1 EP 2868927A1 EP 20130791598 EP20130791598 EP 20130791598 EP 13791598 A EP13791598 A EP 13791598A EP 2868927 A1 EP2868927 A1 EP 2868927A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotor
- spacer
- rotor case
- oil
- oil pump
- 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- Withdrawn
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Classifications
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- 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
- F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
- F04C11/001—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations of similar working principle
- F04C11/003—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations of similar working principle having complementary function
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
- F01C21/10—Outer members for co-operation with rotary pistons; Casings
- F01C21/104—Stators; Members defining the outer boundaries of the working chamber
- F01C21/108—Stators; Members defining the outer boundaries of the working chamber with an axial surface, e.g. side plates
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- 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
- F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
- F04C11/001—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations of similar working principle
-
- 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
- F04C15/0065—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions for eccentric movement
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- 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
- F04C15/06—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
-
- 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
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- 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
- F04C2/103—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 one member having simultaneously a rotational movement about its own axis and an orbital movement
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- 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
- F04C2240/00—Components
- F04C2240/30—Casings or housings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2201/00—Metals
- F05C2201/02—Light metals
- F05C2201/021—Aluminium
Definitions
- the present invention relates to a multistage oil pump which is used particularly for automobiles, and the like.
- Patent Document 1 Japanese Patent Application Laid-open No. 2006-161614
- the multistage oil pump of the present invention is a multistage oil pump, a plurality of rotors being connected in series in the direction of the rotation axis, the plurality of rotors being accommodated in a rotor case, the inside thereof being partitioned by a spacer, the rotor case being divided into rotor case units in the axial direction, and the spacer being made of a material having a specific gravity smaller than that for the rotor.
- the present invention features that the rotor is made of a ferrous material, while the spacer being made of an aluminum-based material.
- the present invention features that, with the rotor case, the spacer is interposed between the rotor case units, the spacer and the respective rotor case units being jointed to each other by dowel pins.
- the spacer is made of a material which has a specific gravity smaller than that for the rotor, whereby weight reduction can be achieved.
- a multistage oil pump 1 includes a housing 2; a cover 3, which closes the housing 2; a rotor case 4, which is accommodated in the housing 2; and first and second rotors 6, 7, which are accommodated in the rotor case 4, being connected in series.
- the housing 2 is bottomed and cylindrical, having a pump discharge port 21 and fitting holes 22.
- fitting holes 31 are formed.
- the rotor case 4 is divided into a first rotor case 41 and a second rotor case 42 in the axial direction, the first rotor case 41 and the second rotor case 42 being partitioned with a spacer 5.
- first rotor case 41 the first rotor 6 is accommodated, while, in the second rotor case 42, the second rotor 7 is accommodated.
- first rotor case 41 a circular first rotor accommodating bore 411, the axis of which is made eccentric with respect to the first rotor case 41, and fitting holes 412 are formed.
- second rotor case 42 a circular second rotor accommodating bore 421, the axis of which is made eccentric with respect to the second rotor case 42, and fitting holes 422 are formed.
- the first rotor case 41 and the second rotor case 42 are disposed in the housing 2, the axis of the first rotor accommodating bore 411 and that of the second rotor accommodating bore 421 being offset from each other.
- an insertion hole 51 for the drive shaft 11, a first rotor discharge port 52, a second rotor suction port 53, and a first rotor suction port 54 are provided in a disk which has the same outside diameter as that of the first rotor case 41 and that of the second rotor case 42.
- the first rotor discharge port 52 is formed in one face of the spacer 5, while the second rotor suction port 53 being formed in the other face of the spacer 5, the first rotor discharge port 52 and the second rotor suction port 53 being communicated to each other.
- dowel pins 8 are protruded, respectively.
- the dowel pin 8 is formed of SUJ (a high carbon bearing steel).
- the spacer 5 is formed of an aluminum-based material which has a specific gravity smaller than that for the first and second rotors 6, 7.
- ADC12, ADC10 and ADC14 for die casting
- AC2A and AC4B for sand mold casting
- A2014, A2017, and the like can be used.
- a side plate 9 and a sealing material 12 are disposed in this order from the side of the first rotor case 41.
- an insertion hole 91 for the drive shaft 11, a purging port 92, and fitting holes 94 are provided in a disk which has the same outside diameter with that of the first rotor case 41.
- the sealing material 12 seals between the cover 3 and the side plate 9.
- the dowel pins 8, which are protruded from the one face of the spacer 5, are fitted to the fitting holes 422 in the second rotor case 42 and the fitting holes 22 in the housing 2, thereby jointing the second rotor case 42 and the housing 2 to the spacer 5 as shown in Figure 7 .
- the dowel pins 8, which are protruded from the other face of the spacer 5, are fitted to the fitting holes 412 in the first rotor case 41, the fitting holes 94 in the side plate 9, and the fitting holes 31 in the cover 3, thereby jointing the first rotor case 41, the side plate 9, and the cover 3 to the spacer 5.
- a first inner rotor 62 is provided in the inside of a first outer rotor 61, the first rotor 6 being formed of a ferrous material.
- the ferrous material specifically, an iron-copper-carbon based material, SMF4030 (JPMA standard), or the like, can be used.
- an oil filling bore 611 is provided in a disk which has an outside diameter substantially equal to the inside diameter of the first rotor accommodating bore 411, the first outer rotor 61 being rotatably disposed in the first rotor accommodating bore 411.
- the oil filling bore 611 is provided, the axis thereof being aligned to the axis of the first outer rotor 61.
- first outer rotor 61 and the first inner rotor 62 there are formed four oil accommodating chambers which are partitioned by the inner peripheral part of the oil filling bore 611, the outer peripheral part of the first inner rotor 62, the spacer 5, and the side plate 9.
- the first inner rotor 62 is fixed to the drive shaft 11, being disposed in the first outer rotor 61 with the axis of the drive shaft 11 being aligned to the axis of the first rotor case 41.
- the second inner rotor 72 is disposed in the inside of the second outer rotor 71.
- an oil filling bore 711 is provided in a disk which has the same shape as that of the first outer rotor 61, the second outer rotor 71 being rotatably disposed in the second rotor accommodating bore 421.
- the second inner rotor 72 has the same shape as that of the first inner rotor 62, being disposed in the second outer rotor 71 with the axis of the drive shaft 11 being aligned to the axis of the second rotor case 42.
- the second outer rotor 71 and the second inner rotor 72 there are formed four oil accommodating chambers which are partitioned by the inner peripheral part of the oil filling bore 711, the outer peripheral part of the second inner rotor 72, the spacer 5, and the housing 2.
- the drive shaft 11 is inserted into the spacer 5 and positioned with a pin; the inner rotor is assembled to the drive shaft 11; and to the inner rotors 62, 72, the outer rotors 61, 71 are fitted, respectively.
- the dowel pins 8 are mounted to the spacer 5; to the one face and the other face of the spacer 5, the rotor cases 41, 42 are assembled, respectively; and further, to the first rotor case 41, the side plate 9 is assembled.
- the assembly is accommodated in the housing 2, and the cover 3 is mounted to the housing 2.
- the oil which has been discharged by the respective oil accommodating chambers of the first rotor 6 from the first rotor discharge port 52 is sucked from the second rotor suction port 53 into the respective oil accommodating chambers of the second rotor 7.
- the first rotor accommodating bore 411 is offset with respect to the second rotor accommodating bore 421, and therefore, as the respective oil accommodating chambers of the first rotor 6 increase their volumes, the respective oil accommodating chambers of the second rotor 7 decrease their volumes.
- the oil which has been discharged from the first rotor discharge port 52 is sucked from the second rotor suction port 53 in its entirety by the respective oil accommodating chambers of the second rotor 7 that are increasing their volumes.
- the spacer 5 is made of a material which has a specific gravity smaller than that for the rotor 6, 7, whereby weight reduction can be achieved.
- the rotors 6, 7 are made of a ferrous material
- the spacer 5 is of an aluminum-based material, whereby occurrence of a seizure between any of the rotors 6, 7 and the spacer 5 can be suppressed.
- the spacer 5 may be made of a magnesium-based material.
- the method of jointing the spacer 5 with the rotor case 41, 42 by means of the dowel pins 8 is optional, and for example, there may be provided a configuration in which rotation stoppage between the rotor case 41, 42 and the spacer 5 is performed by making the outside diameter of the spacer 5 smaller than the outside diameter of the rotor case 41, 42, providing the inner peripheral part of the rotor case 41, 42 with a shoulder which is fitted to the outer peripheral part of the spacer 5, and fitting pins, such as the dowel pins 8, into the fitting parts of both from the outside of the rotor case 41, 42.
- the symbol 1 denotes a multistage oil pump; 11 a drive shaft; 12 a sealing material; 2 a housing; 21 a pump discharge port; 22 a fitting hole; 3 a cover; 31 a fitting hole; 4 a rotor case; 41 a first rotor case; 411 a first rotor accommodating bore; 412 a fitting hole; 42 a second rotor case; 421 a second rotor accommodating bore; 422 a fitting hole; 5 a spacer; 51 an insertion hole; 52 a first rotor discharge port; 53 a second rotor suction port; 54 a first rotor suction port; 6 a first rotor; 61 a first outer rotor; 611 an oil filling bore; 62 a first inner rotor; 7 a second rotor; 71 a second outer rotor; 711 an oil filling bore; 72 a second inner rotor; 8 a dowel pin; 9 a side plate; 91 an insertion hole; 92
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
- Rotary Pumps (AREA)
Abstract
Description
- The present invention relates to a multistage oil pump which is used particularly for automobiles, and the like.
- Conventionally, there have been proposed multistage oil pumps in which a plurality of rotors are connected in series (for example, refer to Patent Document 1). As shown in
Figure 1 inPatent Document 1, trochoid pumps (rotors) 4, 5 are directly accommodated in a housingmain body 1 which is bottomed and cylindrical. - Patent Document 1: Japanese Patent Application Laid-open No.
2006-161614 - However, with the above-mentioned structure, all the components are formed of a ferrous material, therefore the multistage oil pump disclosed in
Patent Document 1 has presented a problem that the weight is large. - It is an object of the present invention to provide a multistage oil pump which can solve the above-mentioned problem.
- In order to solve such a problem, the multistage oil pump of the present invention is a multistage oil pump, a plurality of rotors being connected in series in the direction of the rotation axis, the plurality of rotors being accommodated in a rotor case, the inside thereof being partitioned by a spacer, the rotor case being divided into rotor case units in the axial direction, and the spacer being made of a material having a specific gravity smaller than that for the rotor.
- Further, the present invention features that the rotor is made of a ferrous material, while the spacer being made of an aluminum-based material.
- Further, the present invention features that, with the rotor case, the spacer is interposed between the rotor case units, the spacer and the respective rotor case units being jointed to each other by dowel pins.
- In accordance with the present invention, the spacer is made of a material which has a specific gravity smaller than that for the rotor, whereby weight reduction can be achieved.
-
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Figure 1 is a perspective view of a multistage oil pump in one embodiment of the present invention; -
Figure 2 is a front view of the multistage oil pump inFigure 1 ; -
Figure 3 is an exploded perspective view of the multistage oil pump inFigure 1 when viewed from the cover side; -
Figure 4 is an exploded perspective view of the multistage oil pump inFigure 1 when viewed from the housing side; -
Figure 5 is an exploded perspective view of the multistage oil pump inFigure 1 when viewed from the cover side;. -
Figure 6 is an exploded perspective view of the multistage oil pump inFigure 1 when viewed from the housing side; -
Figure 7 is a sectional view taken in the direction of the arrows of the line A-A inFigure 2 ; and -
Figure 8 is a figure showing the flow of oil in the multistage oil pump. - Hereinbelow, with reference to the drawings, the best mode for carrying out the present invention will be explained.
- As shown in
Figures 1 to 6 , amultistage oil pump 1 includes ahousing 2; acover 3, which closes thehousing 2; arotor case 4, which is accommodated in thehousing 2; and first andsecond rotors rotor case 4, being connected in series. - The
housing 2 is bottomed and cylindrical, having apump discharge port 21 and fittingholes 22. In thecover 3, fittingholes 31 are formed. Therotor case 4 is divided into afirst rotor case 41 and asecond rotor case 42 in the axial direction, thefirst rotor case 41 and thesecond rotor case 42 being partitioned with aspacer 5. - In the
first rotor case 41, thefirst rotor 6 is accommodated, while, in thesecond rotor case 42, thesecond rotor 7 is accommodated. In thefirst rotor case 41, a circular firstrotor accommodating bore 411, the axis of which is made eccentric with respect to thefirst rotor case 41, and fittingholes 412 are formed. In thesecond rotor case 42, a circular secondrotor accommodating bore 421, the axis of which is made eccentric with respect to thesecond rotor case 42, and fittingholes 422 are formed. Thefirst rotor case 41 and thesecond rotor case 42 are disposed in thehousing 2, the axis of the firstrotor accommodating bore 411 and that of the secondrotor accommodating bore 421 being offset from each other. - With the
spacer 5, an insertion hole 51 for thedrive shaft 11, a firstrotor discharge port 52, a secondrotor suction port 53, and a firstrotor suction port 54 are provided in a disk which has the same outside diameter as that of thefirst rotor case 41 and that of thesecond rotor case 42. The firstrotor discharge port 52 is formed in one face of thespacer 5, while the secondrotor suction port 53 being formed in the other face of thespacer 5, the firstrotor discharge port 52 and the secondrotor suction port 53 being communicated to each other. From the one face and the other face of thespacer 5,dowel pins 8 are protruded, respectively. Thedowel pin 8 is formed of SUJ (a high carbon bearing steel). - The
spacer 5 is formed of an aluminum-based material which has a specific gravity smaller than that for the first andsecond rotors - Between the
first rotor case 41 and thecover 3, aside plate 9 and asealing material 12 are disposed in this order from the side of thefirst rotor case 41. With theside plate 9, aninsertion hole 91 for thedrive shaft 11, apurging port 92, and fittingholes 94 are provided in a disk which has the same outside diameter with that of thefirst rotor case 41. The sealingmaterial 12 seals between thecover 3 and theside plate 9. - The
dowel pins 8, which are protruded from the one face of thespacer 5, are fitted to thefitting holes 422 in thesecond rotor case 42 and thefitting holes 22 in thehousing 2, thereby jointing thesecond rotor case 42 and thehousing 2 to thespacer 5 as shown inFigure 7 . Thedowel pins 8, which are protruded from the other face of thespacer 5, are fitted to thefitting holes 412 in thefirst rotor case 41, thefitting holes 94 in theside plate 9, and thefitting holes 31 in thecover 3, thereby jointing thefirst rotor case 41, theside plate 9, and thecover 3 to thespacer 5. - With the
first rotor 6, a firstinner rotor 62 is provided in the inside of a firstouter rotor 61, thefirst rotor 6 being formed of a ferrous material. As the ferrous material, specifically, an iron-copper-carbon based material, SMF4030 (JPMA standard), or the like, can be used. With the firstouter rotor 61, anoil filling bore 611 is provided in a disk which has an outside diameter substantially equal to the inside diameter of the firstrotor accommodating bore 411, the firstouter rotor 61 being rotatably disposed in the firstrotor accommodating bore 411. Theoil filling bore 611 is provided, the axis thereof being aligned to the axis of the firstouter rotor 61. - Between the first
outer rotor 61 and the firstinner rotor 62, there are formed four oil accommodating chambers which are partitioned by the inner peripheral part of theoil filling bore 611, the outer peripheral part of the firstinner rotor 62, thespacer 5, and theside plate 9. - The first
inner rotor 62 is fixed to thedrive shaft 11, being disposed in the firstouter rotor 61 with the axis of thedrive shaft 11 being aligned to the axis of thefirst rotor case 41. - With the
second rotor 7, the secondinner rotor 72 is disposed in the inside of the secondouter rotor 71. With the secondouter rotor 71, anoil filling bore 711 is provided in a disk which has the same shape as that of the firstouter rotor 61, the secondouter rotor 71 being rotatably disposed in the secondrotor accommodating bore 421. The secondinner rotor 72 has the same shape as that of the firstinner rotor 62, being disposed in the secondouter rotor 71 with the axis of thedrive shaft 11 being aligned to the axis of thesecond rotor case 42. - Between the second
outer rotor 71 and the secondinner rotor 72, there are formed four oil accommodating chambers which are partitioned by the inner peripheral part of theoil filling bore 711, the outer peripheral part of the secondinner rotor 72, thespacer 5, and thehousing 2. - Next, the method of assembling the
multistage oil pump 1 will be explained. - First, the
drive shaft 11 is inserted into thespacer 5 and positioned with a pin; the inner rotor is assembled to thedrive shaft 11; and to theinner rotors outer rotors dowel pins 8 are mounted to thespacer 5; to the one face and the other face of thespacer 5, therotor cases first rotor case 41, theside plate 9 is assembled. After thus making temporal assembling, the assembly is accommodated in thehousing 2, and thecover 3 is mounted to thehousing 2. - Next, the operation of the
multistage oil pump 1 will be explained. - Let's assume that, as shown in
Figure 8 , to the oil accommodating chambers in thefirst rotor 6, oil has already been supplied from the firstrotor suction port 54. When thedrive shaft 11 is rotated, the firstouter rotor 61 is rotated by the firstinner rotor 62 in the direction of rotation of thedrive shaft 11, the respective oil accommodating chambers being also moved around thedrive shaft 11. The respective oil accommodating chambers increase their volumes as they are moved away from thedrive shaft 11, sucking the oil from the firstrotor suction port 54 by the amount equal to the respective volumes increased. Further, the respective oil accommodating chambers decrease their volumes as they approach thedrive shaft 11, discharging the oil from thepurging port 92 and the firstrotor discharge port 52 by the amount equal to the respective volumes decreased. - Let's assume that, to the respective oil accommodating chambers of the second
outer rotor 71, oil has already been supplied from the secondrotor suction port 53. When thedrive shaft 11 is rotated, the secondouter rotor 71 is rotated by the secondinner rotor 72 in the direction of rotation of thedrive shaft 11, the respective oil accommodating chambers being also moved around thedrive shaft 11. The respective oil accommodating chambers increase their volumes as they are moved away from thedrive shaft 11, sucking the oil from the secondrotor suction port 53 by the amount equal to the respective volumes increased. Further, the respective oil accommodating chambers decrease their volumes as they approaches thedrive shaft 11, discharging the oil from theoil discharge port 21 by the amount equal to the respective volumes decreased. - The oil which has been discharged by the respective oil accommodating chambers of the
first rotor 6 from the firstrotor discharge port 52 is sucked from the secondrotor suction port 53 into the respective oil accommodating chambers of thesecond rotor 7. The firstrotor accommodating bore 411 is offset with respect to the secondrotor accommodating bore 421, and therefore, as the respective oil accommodating chambers of thefirst rotor 6 increase their volumes, the respective oil accommodating chambers of thesecond rotor 7 decrease their volumes. Thus, the oil which has been discharged from the firstrotor discharge port 52 is sucked from the secondrotor suction port 53 in its entirety by the respective oil accommodating chambers of thesecond rotor 7 that are increasing their volumes. - According to the present embodiment, the
spacer 5 is made of a material which has a specific gravity smaller than that for therotor - Further, according to the present embodiment, the
rotors spacer 5 is of an aluminum-based material, whereby occurrence of a seizure between any of therotors spacer 5 can be suppressed. - In the above-described embodiment, the application where the
spacer 5 is made of an aluminum-based material has been explained, however, thespacer 5 may be made of a magnesium-based material. Further, the method of jointing thespacer 5 with therotor case rotor case spacer 5 is performed by making the outside diameter of thespacer 5 smaller than the outside diameter of therotor case rotor case spacer 5, and fitting pins, such as the dowel pins 8, into the fitting parts of both from the outside of therotor case - Further, in the above-described embodiment, the application where the oil is supplied from the side of the
spacer 5 at the side of therotor case 4 to the oil accommodating chamber in the firstouter rotor 61 has been explained, however, there may be provided a configuration in which the oil is supplied from the side of thecover 3. Further, there may be a configuration in which the oil is supplied to the oil accommodating chamber from thecover 3 through thehousing 2. - The
symbol 1 denotes a multistage oil pump; 11 a drive shaft; 12 a sealing material; 2 a housing; 21 a pump discharge port; 22 a fitting hole; 3 a cover; 31 a fitting hole; 4 a rotor case; 41 a first rotor case; 411 a first rotor accommodating bore; 412 a fitting hole; 42 a second rotor case; 421 a second rotor accommodating bore; 422 a fitting hole; 5 a spacer; 51 an insertion hole; 52 a first rotor discharge port; 53 a second rotor suction port; 54 a first rotor suction port; 6 a first rotor; 61 a first outer rotor; 611 an oil filling bore; 62 a first inner rotor; 7 a second rotor; 71 a second outer rotor; 711 an oil filling bore; 72 a second inner rotor; 8 a dowel pin; 9 a side plate; 91 an insertion hole; 92 a purging port; and 94 a fitting hole.
Claims (3)
- A multistage oil pump, a plurality of rotors being connected in series in the direction of the rotation axis, said plurality of rotors being accommodated in a rotor case, the inside thereof being partitioned by a spacer, the rotor case being divided in the axial direction, and said spacer being made of a material having a specific gravity smaller than that for the rotor.
- The multistage oil pump according to Claim 1, wherein said rotors are made of a ferrous material, while said spacer being made of an aluminum-based material.
- The multistage oil pump according to Claim 1 or 2, wherein, with said rotor case, said spacer is interposed between rotor case units, the spacer and said respective rotor case units being jointed to each other by dowel pins.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012113479A JP6027768B2 (en) | 2012-05-17 | 2012-05-17 | Multistage oil pump |
PCT/JP2013/063649 WO2013172409A1 (en) | 2012-05-17 | 2013-05-16 | Multistage oil pump |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2868927A1 true EP2868927A1 (en) | 2015-05-06 |
EP2868927A4 EP2868927A4 (en) | 2016-03-09 |
Family
ID=49583812
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13791598.9A Withdrawn EP2868927A4 (en) | 2012-05-17 | 2013-05-16 | Multistage oil pump |
Country Status (5)
Country | Link |
---|---|
US (1) | US20150118087A1 (en) |
EP (1) | EP2868927A4 (en) |
JP (1) | JP6027768B2 (en) |
CN (1) | CN104302918A (en) |
WO (1) | WO2013172409A1 (en) |
Families Citing this family (3)
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WO2021133056A1 (en) * | 2019-12-23 | 2021-07-01 | 엘지이노텍 주식회사 | Motor |
CN113586437B (en) * | 2021-08-20 | 2023-01-10 | 宁波开发区安德鲁精铸有限公司 | Oil pump isolation plate and machining process thereof |
US11795948B2 (en) * | 2022-01-21 | 2023-10-24 | Hamilton Sundstrand Corporation | Stacked gerotor pump pressure pulsation reduction |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB596064A (en) * | 1945-07-17 | 1947-12-24 | Stothert & Pitt Ltd | Improvements in or relating to rotary pumps |
US3694113A (en) * | 1971-01-12 | 1972-09-26 | Curtiss Wright Corp | Multi-unit rotary mechanism |
JPS6252219A (en) * | 1985-08-31 | 1987-03-06 | Shimadzu Corp | Operating shaft |
JPH06323261A (en) * | 1993-05-18 | 1994-11-22 | Honda Motor Co Ltd | Oil pump |
JP3635671B2 (en) * | 1993-12-10 | 2005-04-06 | ユニシア ジェーケーシー ステアリングシステム株式会社 | Double cartridge type oil pump |
JPH1122656A (en) * | 1997-07-04 | 1999-01-26 | Matsushita Electric Ind Co Ltd | Solution pump for absorption heat pump and manufacture thereof |
US6123526A (en) * | 1998-09-18 | 2000-09-26 | Industrial Technology Research Institute | Multistage pump and method for assembling the pump |
US7037085B1 (en) * | 2003-03-03 | 2006-05-02 | Stark Patricia A | Dual gear single outlet material pump and method of constructing such a pump |
JP2006161614A (en) | 2004-12-03 | 2006-06-22 | Hitachi Ltd | Tandem type trochoid pump |
JP2006170149A (en) * | 2004-12-17 | 2006-06-29 | Hitachi Ltd | Tandem type oil pump |
WO2006075363A1 (en) * | 2005-01-12 | 2006-07-20 | Mitsubishi Materials Pmg Corporation | Inner rotor for internal gear pump |
CN101446286B (en) * | 2008-10-13 | 2010-11-03 | 镇江大力液压马达有限责任公司 | Modular internal gear pump or motor |
-
2012
- 2012-05-17 JP JP2012113479A patent/JP6027768B2/en active Active
-
2013
- 2013-05-16 EP EP13791598.9A patent/EP2868927A4/en not_active Withdrawn
- 2013-05-16 WO PCT/JP2013/063649 patent/WO2013172409A1/en active Application Filing
- 2013-05-16 US US14/401,596 patent/US20150118087A1/en not_active Abandoned
- 2013-05-16 CN CN201380025650.5A patent/CN104302918A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
EP2868927A4 (en) | 2016-03-09 |
WO2013172409A1 (en) | 2013-11-21 |
JP6027768B2 (en) | 2016-11-16 |
CN104302918A (en) | 2015-01-21 |
JP2013238209A (en) | 2013-11-28 |
US20150118087A1 (en) | 2015-04-30 |
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