WO2013115292A1 - オイルポンプ - Google Patents
オイルポンプ Download PDFInfo
- Publication number
- WO2013115292A1 WO2013115292A1 PCT/JP2013/052131 JP2013052131W WO2013115292A1 WO 2013115292 A1 WO2013115292 A1 WO 2013115292A1 JP 2013052131 W JP2013052131 W JP 2013052131W WO 2013115292 A1 WO2013115292 A1 WO 2013115292A1
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- WIPO (PCT)
- Prior art keywords
- rotor
- oil
- housing
- port
- upstream
- Prior art date
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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
- 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
- F04C15/064—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston machines or pumps
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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
- F04C2/102—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
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/28—Safety arrangements; Monitoring
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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
- F04C2220/00—Application
- F04C2220/20—Pumps with means for separating and evacuating the gaseous phase
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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
- F04C2280/00—Arrangements for preventing or removing deposits or corrosion
- F04C2280/02—Preventing solid deposits in pumps, e.g. in vacuum pumps with chemical vapour deposition [CVD] processes
Definitions
- the present invention relates to an oil pump that sucks and discharges oil (lubricating oil) such as an internal combustion engine (engine), and more particularly, to a trochoid oil pump including an inner rotor and an outer rotor.
- oil lubricating oil
- engine internal combustion engine
- the trochoidal oil pump has a housing, an outer rotor having inner teeth rotatably arranged in the housing, an outer tooth that engages with the inner teeth of the outer rotor, and a volume change in cooperation with the outer rotor.
- an inner rotor that defines a pump chamber with a rotating shaft, a rotary shaft that is rotatably supported by the housing to rotate the inner rotor, a suction port that sucks oil into the housing, and a discharge port that discharges oil
- a purge port air vent hole, bubble exhaust port, deaeration port
- the inner rotor is rotated via the rotating shaft, and the outer rotor is rotated in conjunction with the rotation of the inner rotor.
- To obtain a pump action to suck in and pressurize oil from the suction port, and to discharge the pressurized oil from the discharge port.
- Those to discharge the air mixed into the oil (gas bubbles) or the like from the purge port is known (for example, see Patent Document 1, Patent Document 2, Patent Document 3, etc.).
- the purge port air vent hole, bubble discharge port, deaeration port
- the pressurizing chamber compression stroke
- the inventor has developed an oil pump having characteristics corresponding to a wide range of engine rotation, and the ratio between the oil discharge amount and the purge discharge amount (amount of discharged air-containing oil from the purge port)
- the pump chamber may communicate with the purge port at the same time as the purge port, and oil is sucked from the purge port when the engine is started, and the suction is performed in the high-speed rotation region of the engine. It has been found that oil is sucked from the purge port due to the delay in following the stroke.
- JP-A-9-203308 JP-A-6-167278 The microfilm of Japanese Utility Model Application No. 2-1077738 (Japanese Utility Model Application Publication No. 4-65974)
- the present invention has been made in view of the above circumstances, and the object of the present invention is to prevent sticks and the like due to contamination by foreign matters even when oil is sucked from the purge port. Improve pump performance and durability in a wide range of engine speeds from low to high speeds, including rotation areas where there is little air mixing and rotation areas where air mixing is not important. An object of the present invention is to provide an oil pump capable of improving the performance of the engine.
- An oil pump includes a housing having a suction port for sucking oil, a discharge port for discharging oil, and a purge port for discharging air-containing oil mixed with air, and is rotatable around a predetermined axis in the housing.
- An oil pump comprising an inner rotor arranged and an outer rotor arranged to rotate in conjunction with the inner rotor in the housing, and foreign matter enters the housing from the outside through a purge port.
- the filter member which prevents this is provided. According to this configuration, when this oil pump is applied to, for example, an engine (in a state where the oil pump is disposed in the oil pan), the oil (lubricating oil) is supplied to the inner rotor and the outer rotor under normal operating conditions.
- the aspirated oil is sucked into the pump chamber, and then the aerated oil is pressurized, and then a part of the aerated oil passes from the purge port to the outside of the housing (in the oil pan). Then, the remaining oil is discharged from the discharge port and is pumped toward various lubrication regions.
- the oil level in the oil pan is high, and during high-speed rotation, oil may be sucked from the purge port due to a delay in following the intake stroke. In this case, the oil passes through the filter member and passes through the pump chamber. Therefore, it is possible to prevent sticks and the like due to contamination of foreign matters and the like, thus ensuring the expected pump performance and improving pump performance and durability in a wide range of engine rotation.
- a configuration may be employed in which the purge port is disposed in a region that can communicate with the pump chamber defined by the inner rotor and the outer rotor simultaneously with the suction port. According to this configuration, depending on the rotational speed, when oil is sucked into the pump chamber through the suction port, the oil is also sucked from the purge port. Can be used as a pump for sucking and discharging oil.
- the housing includes a housing main body having a recess for accommodating the inner rotor and the outer rotor, and a housing cover connected to close the opening of the housing main body, the housing cover being formed with a purge port,
- the filter member can employ a configuration that is attached to the housing cover from the outside. According to this configuration, the filter member can be easily attached or detached from the outside of the housing, and therefore, the filter member can be easily replaced without disassembling the housing.
- the inner rotor and the outer rotor are arranged adjacent to each other in the direction of the axis, and are an upstream rotor composed of the first inner rotor and the first outer rotor, and a downstream composed of the second inner rotor and the second outer rotor.
- the housing includes a spacer member interposed between the upstream rotor and the downstream rotor, the suction port is provided so as to face the upstream rotor, and the discharge port faces the downstream rotor
- the purge port is provided so as to face the upstream rotor, and the spacer member is provided with a communication port that guides the oil discharged from the upstream rotor to the downstream rotor. Can do.
- the two-stage trochoidal pump of the upstream rotor and the downstream rotor is adopted, desired pump characteristics can be ensured while achieving a reduction in the outer diameter of the apparatus. Since the suction port, the purge port, and the discharge port are arranged as described above, the pump efficiency can be increased.
- the said structure WHEREIN The structure provided in the spacer member so that an inlet may face an upstream rotor between an upstream rotor and a downstream rotor can be employ
- the inner rotor and the outer rotor may adopt a configuration including four leaves and five nodes. According to this configuration, it is possible to improve pump performance and durability while ensuring a desired discharge amount in a configuration in which an arrangement in which the suction port and the purge port communicate with the pump chamber at the same time is easily established.
- the purge port is formed so as to open in a substantially L shape extending in the rotational direction of the inner rotor and the outer rotor at the radially outer end thereof while extending in the radial direction passing through the axis. Can be adopted. According to this configuration, air can be efficiently discharged from the purge port.
- the oil pump configured as described above, even if oil is sucked in from the purge port, it is possible to prevent sticks and the like due to contamination of foreign matters, etc., and to guarantee the expected pump performance, and also in a rotation region with less air contamination In a wide engine rotation range from a low rotation range to a high rotation range including a rotation range where importance is not placed on air and air mixing, improvement of pump characteristics, improvement of durability, etc. can be achieved.
- FIG. 2 is a plan view showing a housing cover forming a part of the oil pump shown in FIG. 1 and viewed from the rear R side (inner surface side).
- FIG. 4 is a cross-sectional view taken along line E1-E1 in FIG. 4A, showing a housing cover that forms part of the oil pump shown in FIG. 1. It is sectional drawing which decomposed
- FIG. 7 is an end view of the rotor case shown in FIG. 6 and is an end view as seen from the front F side.
- FIG. 7 is an end view of the rotor case shown in FIG. 6 and is an end view as seen from the rear R side.
- FIG. 2 is a plan view showing a side plate forming a part of the oil pump shown in FIG. 1 and viewed from the front F side.
- FIG. 8 is a cross-sectional view taken along line E2-E2 in FIG. 8A, showing a side plate that forms part of the oil pump shown in FIG. FIG.
- FIG. 2 is a plan view showing an inner rotor and an outer rotor that constitute a part of the oil pump shown in FIG. 1, and an upstream rotor composed of a first inner rotor and a first outer rotor as viewed from the rear R side.
- FIG. 2 is a plan view showing an inner rotor and an outer rotor that constitute a part of the oil pump shown in FIG. 1, and a downstream rotor composed of a second inner rotor and a second outer rotor as viewed from the front F side.
- the oil pump includes a housing main body 10 and a housing cover 20 that form a housing, a rotary shaft 30 that is rotatably supported around the axis S by the housing, and is incorporated in the housing.
- the rotor case 40, the side plate 50 that contacts the end face of the rotor case 40, the O-ring 60 as a biasing member that biases the side plate 50 toward the rotor case 40 in the direction of the axis S, and the rotor case 40 are accommodated.
- the upstream rotor 70 composed of the first inner rotor 71 and the first outer rotor 72, the second inner rotor 81 and the second outer rotor housed in the rotor case 40 adjacent to the upstream rotor 70 in the direction of the axis S
- a downstream rotor 80 composed of a rotor 82 and a flange attached to the housing cover 20.
- a filter member 90 or the like
- the housing body 10 is formed so as to form a recess that can accommodate the upstream rotor 70 and the downstream rotor 80 together with the rotor case 40 by using an aluminum material for weight reduction or the like.
- the bearing hole 11 that rotatably supports the one end 31 of the rotary shaft 30 via the bearing G, the cylindrical inner peripheral surface 12 into which the rotor case 40 is fitted, and the inner peripheral surface 12 It is formed by reducing the diameter so as to form a step, and by forming a portion of two annular end faces 13 and an inner peripheral surface 12 formed around the bearing hole 11 radially outward and drilling.
- the housing cover 20 is made of the same aluminum material as that of the housing body 10 for weight reduction and the like, and as shown in FIGS. 1, 2, 4A, 4B, and 5, the other end of the rotary shaft 30 is formed.
- a bearing hole 21 that rotatably supports the bearing 32 via a bearing G, a recess 22 that faces a suction port 44b described later in the direction of the axis S, a recess 23 that faces a communication port 44e described later in the direction of the axis S, a suction A purge port 24 for discharging air mixed in the oil (air-mixed oil), a circular hole 25 through which the bolt B passes, a positioning hole 26 for positioning with the housing body 10, and a positioning hole 27 for positioning the rotor case 40 Further, a cylindrical counterbore portion 28 and the like into which the filter member 90 and the fixing ring 91 are fitted are provided.
- the housing cover 20 is positioned so that the positioning pin fitted in the positioning hole 19 is fitted in the positioning hole 26 and the positioning hole 45a of the rotor case 40 so as to close the opening of the housing body 10.
- the pins are joined to the joining surface 17 so as to be fitted into the positioning holes 27, and the bolts B are passed from the outside through the circular holes 25 and screwed into the screw holes 18 so as to be connected to the housing body 10.
- the purge port 24 extends in the radial direction passing through the axis S, and at the radially outer end thereof, the rotation direction of the first inner rotor 71 and the first outer rotor 72 (arrows). It is formed so as to open in a substantially L shape extending in the direction). Thereby, the air can be efficiently discharged from the purge port 24.
- the purge port is not limited to the purge port 24 having the above-described form, and a desired form can be appropriately adopted according to a target purge discharge amount or the like.
- the rotating shaft 30 is formed to extend in the direction of the axis S using steel or the like, and is supported by the bearing hole 11 of the housing body 10 via the bearing G. , The other end portion 32 supported by the bearing hole 21 of the housing cover 20 via the bearing G, the shaft portion 33 for integrally rotating the first inner rotor 71 of the upstream rotor 70, and the second inner portion of the downstream rotor 80.
- a shaft portion 34 that integrally rotates the rotor 81, a shaft portion 35 supported by the bearing G, and the like are provided.
- the rotating shaft 30 is connected to a rotating member or the like that forms part of the engine and is driven to rotate.
- the rotor case 40 is formed using steel, cast iron, sintered steel, or the like. As shown in FIGS. 2, 6, 7 ⁇ / b> A, and 7 ⁇ / b> B, the cylindrical portion 41 and the cylindrical portion 41 centering on the axis S are provided.
- An intermediate wall portion 44 as a spacer member formed between the inner peripheral surface 42 and the inner peripheral surface 43, a bearing hole 44a provided in the intermediate wall portion 44, a suction port 44b provided in the intermediate wall portion 44, An upstream rotor discharge port 44c provided in the intermediate wall 44, a downstream rotor intake port 44d provided in the intermediate wall 44, and a communication port through which the upstream rotor discharge port 44c and the downstream rotor intake port 44d communicate with each other.
- the end face 45 over 20 abuts includes positioning holes 45a formed in the end face 45, the end face 46 side plate 50 abuts the positioning hole 46a or the like formed on the end face 46.
- the cylindrical portion 41 can move relatively in the direction of the axis S according to the difference in thermal deformation (expansion and contraction) between the housing body 10 and the rotor case 40 while being in close contact with the inner peripheral surface 12 of the housing body 10. It is formed to have an outer diameter dimension that fits into the housing.
- the inner peripheral surface 42 is formed to have a size that allows the first outer rotor 72 of the upstream rotor 70 to be inscribed so as to be rotatable (slidable) about the axis L1.
- the inner peripheral surface 43 is formed to have a dimension that allows the second outer rotor 82 of the downstream rotor 80 to be inscribed so as to be rotatable (slidable) about the axis L2.
- the suction port 44b communicates with the suction passage 14 and is formed so as to face the upstream rotor 70 (the pump chamber P thereof).
- the suction port 44b is provided between the upstream rotor 70 and the downstream rotor 80 so as to face the upstream rotor 70, the oil sucked from the suction port 44b is supplied to the upstream rotor 70. It is possible to pressurize the inside reliably and send it to the downstream rotor 80 through the communication port 44e, thereby improving the pump performance as a whole.
- the communication port 44e is formed so that the upstream rotor discharge port 44c and the downstream rotor suction port 44d communicate with each other, and the oil discharged from the upstream rotor 70 is guided to the downstream rotor 80.
- the rotor case 40 cooperates with the end surface 13 in the state in which the upstream rotor 70 is accommodated on the inner peripheral surface 42 and the downstream rotor 80 is accommodated on the inner peripheral surface 43 together with the rotary shaft 30, and the O-ring 60 and the side plate.
- the positioning pin fitted into the positioning hole 16 while being sandwiched 50 is fitted into the inner peripheral surface 12 of the housing body 10 so as to be fitted into the positioning hole 46a.
- the side plate 50 is formed in a disc shape using steel, cast iron, sintered steel, aluminum alloy or the like, and as shown in FIGS. 2 and 8, a circular hole 51 through which the rotary shaft 30 passes, a downstream rotor, and the like.
- a discharge port 52 for discharging the oil pressurized by 80, a positioning hole 53, a recess 54 for receiving one end side of the bearing G, and the like are provided. Then, the side plate 50 is assembled to the housing body 10 such that the positioning pin fitted in the positioning hole 16 of the housing body 10 passes through the positioning hole 53 and the O-ring 60 is sandwiched between the side plate 50 and the end surface 13. It has become.
- the O-ring 60 is formed in an annular shape by an elastically deformable rubber material or the like, and is disposed between the end surface 13 of the housing body 10 and the side plate 50 so that the side plate 50 faces the end surface 46 of the rotor case 40. In order to energize, it is compressed and assembled by a predetermined compression amount in the direction of the axis S.
- the upstream rotor 70 is formed using steel, sintered steel, or the like, and includes a first inner rotor 71 and a first outer rotor 72 as shown in FIG. 9A.
- the first inner rotor 71 is formed as an external gear having a fitting hole 71a for fitting the shaft portion 33 of the rotating shaft 30 and having four peaks and valleys (dents) on the outer periphery thereof.
- the first outer rotor 72 has an outer peripheral surface 72 a that is slidably fitted to the inner peripheral surface 42 of the rotor case 40, and four crests (external teeth) and troughs of the first inner rotor 71 on the inner periphery thereof ( It is formed as an internal gear having five ridges (inner teeth) and valleys (dents) that mesh with the dents. That is, the upstream rotor 70 (the first inner rotor 71 and the first outer rotor 72) constitutes a trochoid pump having four leaves and five nodes.
- the first inner rotor 71 rotates together with the rotary shaft 30 in the direction of the arrow (counterclockwise in FIG. 9A) about the axis S
- the first outer rotor 72 is interlocked to move the arrow about the axis L1.
- the volume of the pump chamber P defined by both changes, and the oil is sucked from the suction port 44b and subsequently pressurized.
- the aerated oil is discharged from the purge port 24, and then the remaining oil is discharged from the upstream rotor discharge port 44c toward the downstream rotor 80, and this process is continuously repeated. Further, as shown in FIG.
- the purge port 24 is disposed in a region that can communicate with the pump chamber P defined by the first inner rotor 71 and the first outer rotor 72 simultaneously with the suction port 44 b. . Therefore, when the oil level in the oil pan at the time of starting the engine is high or when the follow-up delay of the intake stroke occurs when the engine rotates at high speed, the oil can be sucked into the pump chamber P from the purge port 24. . That is, depending on the rotational speed, when oil is sucked into the pump chamber P through the suction port 44b, the oil is also sucked from the purge port 24. Therefore, in the rotation region where the air content is low or the exhaustion of air is not important. However, it can be used as a pump that sucks and discharges oil.
- the downstream rotor 80 is formed using steel, sintered steel, or the like, and includes a second inner rotor 81 and a second outer rotor 82 as shown in FIG. 9B.
- the second inner rotor 81 is formed as an external gear having a fitting hole 81a for fitting the shaft portion 34 of the rotating shaft 30 and having four peaks and valleys (dents) on the outer periphery.
- the second outer rotor 82 has an outer peripheral surface 82a that is slidably fitted to the inner peripheral surface 43 of the rotor case 40, and has four crests (external teeth) and troughs (dents) of the second inner rotor 81 on the inner periphery.
- the downstream rotor 80 (the second inner rotor 81 and the second outer rotor 82) constitutes a four-leaf five-section trochoid pump.
- the rotor case 40 and the side plate 50 constitute a second housing that further accommodates the upstream rotor 70 and the downstream rotor 80 inside the housing (the housing body 10 and the housing cover 20).
- the housing (housing body 10) made of an aluminum material. Even if the housing cover 20) is thermally expanded and a clearance is generated in the axis S direction, the rotor case 40 and the side plate 50 are attached to one side in the axis S direction by the urging force of the O-ring 60. Therefore, a gap is not generated between both side surfaces of the upstream rotor 70 and both side surfaces of the downstream rotor 80, and desired pump performance (discharge characteristics) can be ensured.
- the filter member 90 has a mesh shape with a predetermined size so as to remove foreign matters mixed in the oil, and has a semicircular sphere with an annular flange. It is formed to make. Then, the filter member 90 is fitted into the counterbore portion 28 so as to cover the purge port 24 of the housing cover 20, and the annular fixing ring 91 is fitted from above to be attached to the housing cover 20 from the outside. It is like that. In this way, the filter member 90 can be easily attached or removed from the outside of the housing (housing body 10 and housing cover 20), and therefore the filter member can be removed without disassembling the housing (housing body 10 and housing cover 20). 90 replacement work and the like can be easily performed.
- the filter member is not limited to the mesh-like filter member 90 formed in a hemispherical shape and the fixing ring 91 for fixing the filter member as described above, and the filter member and the fixing method have other configurations and forms. Can be adopted.
- a C-shaped snap ring 91 ′ is adopted instead of the fixing ring 91, and an annular groove 28 ′ is provided on the inner peripheral surface of the counterbore portion 28 of the housing cover 20. It may be adopted.
- the filter member 90 is fitted into the counterbore part 28 so as to cover the purge port 24 of the housing cover 20, and from above, the C-shaped snap ring 91 ′ is fitted into the annular groove 28 ′.
- the housing cover 20 is attached from the outside.
- the filter member 90 can be easily attached or removed from the outside of the housing (housing body 10 and housing cover 20), and therefore without disassembling the housing (housing body 10 and housing cover 20).
- the replacement work of the filter member 90 can be easily performed.
- FIG. 9A when the engine is in the normal rotation region (when oil is not sucked from the purge port 24), the upstream rotor 70 (the first inner rotor 71 and the first outer rotor 72) is counterclockwise in FIG. 9A. By rotating around, the oil is sucked into the pump chamber P of the upstream rotor 70 via the suction passage 14 ⁇ the suction port 44 b.
- the oil sucked into the pump chamber P is pressurized by the continuous rotation of the upstream rotor 70, and the aerated oil is positively discharged from the purge port 24 to the outside during this pressurization process.
- This oil is guided to the downstream rotor 80 through the upstream rotor discharge port 44c ⁇ the communication port 44e ⁇ the downstream rotor suction port 44d.
- the pump chambers of the upstream rotor 70 (the first inner rotor 71 and the first outer rotor 72) and the downstream rotor 80 (the second inner rotor 81 and the second outer rotor 82) cooperate with each other.
- Oil mixed with air oil mixed with air
- the filter member 90 is provided at the purge port 24, foreign matter or the like accumulated in the oil pan can be prevented from being sucked into the pump P. Therefore, the upstream rotor 70 and the downstream rotor 80 It is possible to prevent sticks and the like, guarantee the expected pump performance, and achieve improvement in pump performance and durability in a wide range of engine rotation.
- the present invention is adopted in the configuration including the rotor case 40 and the side plate 50 as the second housing inside the housing (the housing main body 10 and the housing cover 20) is shown.
- the present invention may be applied to a configuration in which the rotor case 40, the side plate 50, and the like are eliminated.
- a two-stage trochoidal pump including the upstream rotor 70 (first inner rotor 71 and first outer rotor 72) and the downstream rotor 80 (second inner rotor 81 and second outer rotor 82).
- the present invention is not limited to this, and the present invention may be applied to a configuration including a pair of inner rotor and outer rotor.
- the present invention is adopted in the configuration in which the housing is separated into the housing main body and the housing cover has been described.
- the present invention is not limited to this. You may apply this invention in the structure provided with the housing which consists of a housing half body and a 2nd housing half body.
- the trochoid pump is shown as the oil pump.
- the present invention is not limited to this, and the present invention may be applied to an internal gear type oil pump or an external gear type oil pump. Good.
- the oil pump of the present invention even if oil is sucked from the purge port, it is possible to prevent sticking due to foreign matters and the like to guarantee the expected pump performance, Because it can achieve improved pump characteristics and improved durability in a wide range of engine speeds from low to high speeds, including rotation areas with little contamination and rotation areas that do not place importance on air, automobiles, etc.
- the present invention can be applied to an engine mounted on a motorcycle, and is also useful for a motorcycle, a vehicle equipped with another engine, or other mechanisms that require pumping of lubricating oil.
- Housing body (housing) 11 Bearing hole 12 Inner peripheral surface 13 End surface 14 Suction passage 15 Discharge passage 16 Positioning hole 17 Joint surface 18 Screw hole 19 Positioning hole 20 Housing cover (housing) 21 bearing hole 22 concave portion 23 concave portion 24 purge port 25 circular hole 26 positioning hole 27 positioning hole 28 counterbore portion 30 'annular groove 30 rotating shaft S axis 31 one end portion 32 other end portions 33, 34, 35 shaft portion 40 rotor case 41 Cylindrical portion 42 Inner peripheral surface 43 Inner peripheral surface 44 Intermediate wall portion (spacer member) 44a Bearing hole 44b Suction port 44c Upstream rotor discharge port 44d Downstream rotor suction port 44e Communication port 45 End surface 45a Positioning hole 46 End surface 46a Positioning hole 50 Side plate 51 Circular hole 52 Discharge port 53 Positioning hole 54 Recess 60 O-ring 70 Upstream Side rotor P Pump chamber 71 First inner rotor 71a Fitting hole 72 First outer rotor L1 Axis 72a outer peripheral surface 80 Downstream rotor P Pump chamber
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Abstract
Description
この構成によれば、このオイルポンプが例えばエンジン(のオイルパン内に配置された状態)に適用された場合において、通常の運転条件下においては、オイル(潤滑油)は、インナーロータ及びアウターロータのポンプ作用により、ポンプ室に吸い込まれ、続いて、吸い込まれた空気混入のオイルは加圧され、続いて、空気混入のオイルの一部がパージ口からハウジングの外部(でオイルパン内)に排出され、続いて、残りのオイルが吐出口から吐出されて、種々の潤滑領域に向けて圧送される。
一方、エンジンの始動時にはオイルパン内の油面が高いため又高速回転時においては吸入行程の追従遅れにより、パージ口からオイルが吸い込まれる場合があり、この場合において、オイルはフィルタ部材を通してポンプ室に吸い込まれるため、異物等の混入によるスティック等を防止でき、それ故に所期のポンプ性能を保証でき、幅広いエンジン回転領域において、ポンプ性能の向上、耐久性の向上等を達成することができる。
この構成によれば、回転速度によっては、オイルが、吸入口を通してポンプ室に吸い込まれる際に、パージ口からも吸い込まれるため、空気の含有量が少ない回転領域や空気の排出を重視しない回転領域においても、オイルを吸入して吐出するポンプとして使用することが可能になる。
この構成によれば、ハウジングの外側からフィルタ部材を容易に取り付け又は取り外すことができ、それ故にハウジングを分解することなく、フィルタ部材の交換作業等も容易に行うことができる。
この構成によれば、上流側ロータ及び下流側ロータの二段のトロコイド式ポンプを採用するため、装置の外径寸法の小型化を達成しつつ、所望のポンプ特性を確保することができ、又、吸入口、パージ口、吐出口が上記のような配置構成となっているため、ポンプ効率を高めることができる。
この構成によれば、吸入口から吸い込まれたオイルを上流側ロータ内において確実に加圧し連通口を通して下流側ロータに送り出すことができ、全体としてのポンプ性能を向上させることができる。
この構成によれば、ポンプ室に対して吸入口とパージ口とが同時に連通する配置が成立し易い構成において、所望の吐出量を確保しつつ、ポンプ性能及び耐久性を向上させることができる。
この構成によれば、パージ口からの空気の排出を効率良く行うことができる。
この実施形態に係るオイルポンプは、図1及び図2に示すように、ハウジングをなすハウジング本体10及びハウジングカバー20、ハウジングにより軸線S回りに回転自在に支持された回転軸30、ハウジング内に組み込まれたロータケース40、ロータケース40の端面に当接するサイドプレート50、サイドプレート50を軸線Sの方向においてロータケース40側に付勢する付勢部材としてのOリング60、ロータケース40内に収容された第1インナーロータ71及び第1アウターロータ72からなる上流側ロータ70、軸線Sの方向において上流側ロータ70に隣接してロータケース40内に収容された第2インナーロータ81及び第2アウターロータ82からなる下流側ロータ80、ハウジングカバー20に取り付けられたフィルタ部材90等を備えている。
ここで、パージ口24は、図4A及び図9Aに示すように、軸線Sを通る径方向に伸長すると共にその径方向外側端において第1インナーロータ71及び第1アウターロータ72の回転方向(矢印方向)に伸長する略L字状に開口するように形成されている。これにより、パージ口24からの空気の排出を効率良く行うことができる。
尚、パージ口としては、上記の形態をなすパージ口24に限るものではなく、目標とするパージ排出量等に応じて適宜所望の形態を採用することができる。
そして、回転軸30は、エンジンの一部をなす回転部材等に連結されて回転駆動されるようになっている。
内周面42は、上流側ロータ70の第1アウターロータ72を軸線L1回りに回動(摺動)自在に内接させる寸法に形成されている。
内周面43は、下流側ロータ80の第2アウターロータ82を軸線L2回りに回動(摺動)自在に内接させる寸法に形成されている。
吸入口44bは、吸入通路14に連通すると共に、上流側ロータ70(のポンプ室P)に臨むように形成されている。
このように、吸入口44bは、上流側ロータ70と下流側ロータ80との間において、上流側ロータ70に臨むように設けられているため、吸入口44bから吸い込まれたオイルを上流側ロータ70内において確実に加圧し連通口44eを通して下流側ロータ80に送り出すことができ、全体としてのポンプ性能を向上させることができる。
連通口44eは、上流側ロータ吐出口44cと下流側ロータ吸入口44dとを連通させて、上流側ロータ70から吐出されたオイルを下流側ロータ80に導くように形成されている。
そして、ロータケース40は、回転軸30と共に内周面42に上流側ロータ70及び内周面43に下流側ロータ80を収容した状態で、端面13と協働して、Oリング60及びサイドプレート50を挟み込みつつ位置決め穴16に嵌合された位置決めピンを位置決め穴46aに嵌め込むようにして、ハウジング本体10の内周面12に組み付けられる(嵌め込まれる)ようになっている。
そして、サイドプレート50は、ハウジング本体10の位置決め穴16に嵌合された位置決めピンを位置決め孔53に通して、端面13との間にOリング60を挟み込むようにしてハウジング本体10に組み付けられるようになっている。
第1インナーロータ71は、回転軸30の軸部33を嵌合させる嵌合孔71aを有すると共にその外周に4つの山及び谷(凹み)をもつ外歯車として形成されている。
第1アウターロータ72は、ロータケース40の内周面42に摺動自在に嵌合される外周面72aを有すると共にその内周において第1インナーロータ71の4つの山(外歯)及び谷(凹み)と噛み合う5つの山(内歯)及び谷(凹み)をもつ内歯車として形成されている。
すなわち、上流側ロータ70(第1インナーロータ71及び第1アウターロータ72)は、4葉5節のトロコイドポンプを構成するものである。
また、図10に示すように、パージ口24は、第1インナーロータ71及び第1アウターロータ72により画定されるポンプ室Pに対して、吸入口44bと同時に連通し得る領域に配置されている。したがって、エンジン始動時のオイルパン内の油面が高い時又は高速回転時において吸入行程の追従遅れを生じるような場合に、パージ口24からポンプ室Pにオイルが吸い込まれ得るようになっている。
すなわち、回転速度によっては、オイルが、吸入口44bを通してポンプ室Pに吸い込まれる際に、パージ口24からも吸い込まれるため、空気の含有量が少ない回転領域や空気の排出を重視しない回転領域においても、オイルを吸入して吐出するポンプとして使用することが可能になる。
第2インナーロータ81は、回転軸30の軸部34を嵌合させる嵌合孔81aを有すると共に外周に4つの山及び谷(凹み)をもつ外歯車として形成されている。
第2アウターロータ82は、ロータケース40の内周面43に摺動自在に嵌合される外周面82aを有すると共に内周において第2インナーロータ81の4つの山(外歯)及び谷(凹み)と噛み合う5つの山(内歯)及び谷(凹み)をもつ内歯車として形成されている。
すなわち、下流側ロータ80(第2インナーロータ81及び第2アウターロータ82)は、4葉5節のトロコイドポンプを構成するものである。
また、ロータケース40及びサイドプレート50は、ハウジング(ハウジング本体10及びハウジングカバー20)の内側においてさらに上流側ロータ70及び下流側ロータ80を収容する第2のハウジングを構成するものである。
そして、ロータケース40及びサイドプレート50は、上流側ロータ70及び下流側ロータ80と同一の材料(鋼又は焼結鋼等)により形成されているため、アルミニウム材料により形成されたハウジング(ハウジング本体10及びハウジングカバー20)が熱膨張して、軸線S方向にクリアランスを生じるような場合があっても、Oリング60の付勢力により、ロータケース40及びサイドプレート50が軸線S方向の一方側に付勢されるため、上流側ロータ70の両側面及び下流側ロータ80の両側面において隙間を生じることはなく、所期のポンプ性能(吐出特性)を確保することができる。
そして、フィルタ部材90は、ハウジングカバー20のパージ口24を覆うべく、座ぐり部28に嵌め込まれ、その上から環状の固定リング91が嵌め込まれることで、ハウジングカバー20に対して外側から取り付けられるようになっている。
このように、ハウジング(ハウジング本体10及びハウジングカバー20)の外側からフィルタ部材90を容易に取り付け又は取り外すことができ、それ故にハウジング(ハウジング本体10及びハウジングカバー20)を分解することなく、フィルタ部材90の交換作業等も容易に行うことができる。
尚、フィルタ部材としては、上術の如く半円球に形成された網目状のフィルタ部材90及びそれを固定する固定リング91に限るものではなく、その他の構成及び形態をなすフィルタ部材及び固定手法を採用することができる。
例えば、図11に示すように、固定リング91に換えてC状のスナップリング91´を採用し、又、ハウジングカバー20の座ぐり部28の内周面に環状溝28´を設けた構成を採用してもよい。
これによれば、フィルタ部材90は、ハウジングカバー20のパージ口24を覆うべく、座ぐり部28に嵌め込まれ、その上からC状のスナップリング91´が環状溝28´に嵌め込まれることで、ハウジングカバー20に対して外側から取り付けられるようになっている。
この場合も同様に、ハウジング(ハウジング本体10及びハウジングカバー20)の外側からフィルタ部材90を容易に取り付け又は取り外すことができ、それ故にハウジング(ハウジング本体10及びハウジングカバー20)を分解することなく、フィルタ部材90の交換作業等も容易に行うことができる。
先ず、エンジンが通常の回転領域にある場合(オイルがパージ口24から吸い込まれない場合)においては、上流側ロータ70(第1インナーロータ71及び第1アウターロータ72)が、図9Aにおいて反時計回りに回転することにより、オイルが、吸入通路14→吸入口44bを経て、上流側ロータ70のポンプ室P内に吸い込まれる。
そして、下流側ロータ80の連続的な回転により、ポンプ室Pに吸入されたオイルは加圧され、吐出口52→吐出通路15を経て、外部の潤滑領域に供給される。
この場合、パージ口24にはフィルタ部材90が設けられているため、オイルパン内に溜まった異物等がポンプPに吸い込まれるのを防止でき、それ故に、上流側ロータ70及び下流側ロータ80のスティック等を防止でき、所期のポンプ性能を保証でき、幅広いエンジン回転領域において、ポンプ性能の向上、耐久性の向上等を達成することができる。
上記実施形態においては、上流側ロータ70(第1インナーロータ71及び第1アウターロータ72)及び下流側ロータ80(第2インナーロータ81及び第2アウターロータ82)を備えた二段のトロコイド式ポンプにおいて、本発明を採用した場合を示したが、これに限定されるものではなく、一組のインナーロータ及びアウターロータを備えた構成において、本発明を適用してもよい。
上記実施形態においては、オイルポンプとして、トロコイドポンプを示したが、これに限定されるものではなく、内接ギヤ式のオイルポンプあるいは外接ギヤ式のオイルポンプ等において、本発明を採用してもよい。
11 軸受孔
12 内周面
13 端面
14 吸入通路
15 吐出通路
16 位置決め穴
17 接合面
18 ネジ穴
19 位置決め穴
20 ハウジングカバー(ハウジング)
21 軸受孔
22 凹部
23 凹部
24 パージ口
25 円孔
26 位置決め穴
27 位置決め穴
28 座ぐり部
28´ 環状溝
30 回転軸
S 軸線
31 一端部
32 他端部
33,34,35 軸部
40 ロータケース
41 円筒部
42 内周面
43 内周面
44 中間壁部(スペーサ部材)
44a 軸受孔
44b 吸入口
44c 上流側ロータ吐出口
44d 下流側ロータ吸入口
44e 連通口
45 端面
45a 位置決め穴
46 端面
46a 位置決め穴
50 サイドプレート
51 円孔
52 吐出口
53 位置決め孔
54 凹部
60 Oリング
70 上流側ロータ
P ポンプ室
71 第1インナーロータ
71a 嵌合孔
72 第1アウターロータ
L1 軸線
72a 外周面
80 下流側ロータ
P ポンプ室
81 第2インナーロータ
81a 嵌合孔
82 第2アウターロータ
L2 軸線
82a 外周面
90 フィルタ部材
91 固定リング
91´ スナップリング
Claims (7)
- オイルを吸入する吸入口,オイルを吐出する吐出口,空気が混入した空気混入オイルを排出するパージ口を有するハウジングと、
前記ハウジング内において所定の軸線回りに回転自在に配置されたインナーロータと、
前記ハウジング内において前記インナーロータに連動して回転するべく配置されたアウターロータと、
を備えたオイルポンプであって、
前記ハウジングには、その外側から前記パージ口を通して異物が侵入するのを防止するフィルタ部材が設けられている、
ことを特徴とするオイルポンプ。 - 前記パージ口は、前記インナーロータ及びアウターロータにより画定されるポンプ室に対して、前記吸入口と同時に連通し得る領域に配置されている、
ことを特徴とする請求項1に記載のオイルポンプ。 - 前記ハウジングは、前記インナーロータ及びアウターロータを収容する凹部を有するハウジング本体と、前記ハウジング本体の開口を閉鎖するべく連結されるハウジングカバーとを含み、
前記ハウジングカバーには、前記パージ口が形成され、
前記フィルタ部材は、前記ハウジングカバーに対して外側から取り付けられている、
ことを特徴とする請求項1又は2に記載のオイルポンプ。 - 前記インナーロータ及びアウターロータは、前記軸線の方向において隣接して配置された,第1インナーロータ及び第1アウターロータからなる上流側ロータと、第2インナーロータ及び第2アウターロータからなる下流側ロータを含み、
前記ハウジングは、前記上流側ロータと前記下流側ロータとの間に介在するスペーサ部材を含み、
前記吸入口は、前記上流側ロータに臨むように設けられ、
前記吐出口は、前記下流側ロータに臨むように設けられ、
前記パージ口は、前記上流側ロータに臨むように設けられ、
前記スペーサ部材には、前記上流側ロータから吐出されたオイルを前記下流側ロータに導く連通口が設けられている、
ことを特徴とする請求項1ないし3いずれか一つに記載のオイルポンプ。 - 前記吸入口は、前記上流側ロータと前記下流側ロータとの間において、前記上流側ロータに臨むように前記スペーサ部材に設けられている、
ことを特徴とする請求項4に記載のオイルポンプ。 - 前記インナーロータ及びアウターロータは、4葉5節からなる、
ことを特徴とする請求項1ないし5いずれか一つに記載のオイルポンプ。 - 前記パージ口は、前記軸線を通る径方向に伸長すると共にその径方向外側端において前記インナーロータ及びアウターロータの回転方向に伸長する略L字状に開口するように形成されている、
ことを特徴とする請求項1ないし5いずれか一つに記載のオイルポンプ。
Priority Applications (4)
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JP2013556486A JP6040170B2 (ja) | 2012-02-03 | 2013-01-31 | オイルポンプ |
EP13744367.7A EP2811163A4 (en) | 2012-02-03 | 2013-01-31 | OIL PUMP |
CN201380007420.6A CN104093985A (zh) | 2012-02-03 | 2013-01-31 | 油泵 |
US14/375,981 US20150010420A1 (en) | 2012-02-03 | 2013-01-31 | Oil pump |
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Application Number | Priority Date | Filing Date | Title |
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JP2012-021728 | 2012-02-03 | ||
JP2012021728 | 2012-02-03 |
Publications (1)
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WO2013115292A1 true WO2013115292A1 (ja) | 2013-08-08 |
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PCT/JP2013/052131 WO2013115292A1 (ja) | 2012-02-03 | 2013-01-31 | オイルポンプ |
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US (1) | US20150010420A1 (ja) |
EP (1) | EP2811163A4 (ja) |
JP (1) | JP6040170B2 (ja) |
CN (1) | CN104093985A (ja) |
WO (1) | WO2013115292A1 (ja) |
Cited By (1)
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WO2015022929A1 (ja) * | 2013-08-12 | 2015-02-19 | 株式会社ミクニ | 空気排出口付きトロコイドポンプ |
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JP5878786B2 (ja) * | 2012-02-21 | 2016-03-08 | 株式会社ミクニ | オイルポンプ |
US11549443B2 (en) * | 2020-08-28 | 2023-01-10 | Pratt & Whitney Canada Corp. | Sealing arrangement with vent for an engine component with a service port |
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JP2006348750A (ja) * | 2003-07-25 | 2006-12-28 | Mikuni Corp | オイルポンプ |
Non-Patent Citations (1)
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2015022929A1 (ja) * | 2013-08-12 | 2015-02-19 | 株式会社ミクニ | 空気排出口付きトロコイドポンプ |
JP2015036517A (ja) * | 2013-08-12 | 2015-02-23 | 株式会社ミクニ | 空気排出口付きトロコイドポンプ |
CN105518301A (zh) * | 2013-08-12 | 2016-04-20 | 株式会社三国 | 带有空气排出口的次摆线泵 |
US9784270B2 (en) | 2013-08-12 | 2017-10-10 | Mikuni Corporation | Trochoid pump with air ejection port |
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JPWO2013115292A1 (ja) | 2015-05-11 |
EP2811163A4 (en) | 2015-11-11 |
US20150010420A1 (en) | 2015-01-08 |
JP6040170B2 (ja) | 2016-12-07 |
CN104093985A (zh) | 2014-10-08 |
EP2811163A1 (en) | 2014-12-10 |
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