WO2017154438A1 - 可変容量形ポンプ - Google Patents
可変容量形ポンプ Download PDFInfo
- Publication number
- WO2017154438A1 WO2017154438A1 PCT/JP2017/004185 JP2017004185W WO2017154438A1 WO 2017154438 A1 WO2017154438 A1 WO 2017154438A1 JP 2017004185 W JP2017004185 W JP 2017004185W WO 2017154438 A1 WO2017154438 A1 WO 2017154438A1
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- WIPO (PCT)
- Prior art keywords
- discharge
- oil chamber
- variable displacement
- pump
- displacement pump
- 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
- F04C2/00—Rotary-piston machines or pumps
- F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
- F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
- F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
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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
-
- 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
- F04C14/18—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
- F04C14/22—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members
- F04C14/223—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members using a movable cam
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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
- F04C14/18—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
- F04C14/22—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members
- F04C14/223—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members using a movable cam
- F04C14/226—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members using a movable cam by pivoting the cam around an eccentric axis
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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
-
- 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
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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
- F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
- F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
- F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
- F04C2/3441—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation
- F04C2/3442—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation the surfaces of the inner and outer member, forming the working space, being surfaces of revolution
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M1/00—Pressure lubrication
- F01M1/02—Pressure lubrication using lubricating pumps
- F01M2001/0207—Pressure lubrication using lubricating pumps characterised by the type of pump
- F01M2001/0238—Rotary 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
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
- F04C15/003—Sealings for working fluid between radially and axially moving parts
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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
- F04C2210/00—Fluid
- F04C2210/20—Fluid liquid, i.e. incompressible
- F04C2210/206—Oil
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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
- F04C2270/00—Control; Monitoring or safety arrangements
- F04C2270/18—Pressure
- F04C2270/185—Controlled or regulated
Definitions
- the present invention relates to a variable displacement pump that is applied to a hydraulic power source that supplies hydraulic oil to each sliding portion of an internal combustion engine for an automobile, for example.
- a first control oil chamber and a second control oil chamber are separated between an inner peripheral surface of the pump housing and an outer peripheral surface of the cam ring, and a pump discharge pressure is generated in the first control oil chamber.
- the cam ring is biased in a direction in which the eccentric amount of the cam ring is reduced (hereinafter referred to as a concentric direction).
- the pump discharge pressure is supplied to the second control oil chamber, the cam ring is biased in a direction in which the eccentric amount increases (hereinafter referred to as an eccentric direction).
- the spring force of the coil spring urges the cam ring so that the eccentric direction of the cam ring increases in cooperation with the hydraulic oil in the second control oil chamber.
- the internal pressure of the plurality of pump chambers separated by the plurality of vanes protruding and retracting in the radial direction from the outer peripheral surface of the rotor and the inner peripheral surface of the cam ring also contributes to the eccentric control of the cam ring and the swing control in the concentric direction. It has become.
- the supply and discharge of the pump discharge pressure to and from the second control oil chamber is controlled by the electromagnetic switching valve and the pilot valve, thereby controlling the eccentric amount of the cam ring according to the engine speed, and the low pressure characteristic and the high pressure characteristic.
- the plurality of pump chambers and the first and second control oil chambers are arranged in the axial direction of the cam ring that is slidably in contact with the opposed inner surface of the pump housing and both the inner surfaces. It is sealed by a so-called side clearance between both end faces.
- the second control oil chamber is disposed in the discharge side region, which is the high pressure region of each pump chamber, for example, when the oil viscosity is low, such as at high oil temperature, the sealing action due to the side clearance is not effective.
- the high-pressure oil in each pump chamber leaks into the second control oil chamber through the side clearance. That is, during low-pressure control or high-pressure control, oil cannot be quickly discharged from the second control oil chamber due to the passage resistance of the electromagnetic switching valve or pilot valve, and leaks that have flowed into the second control oil chamber from the side clearance. The amount of oil will be relatively large.
- the present invention has been devised in view of the technical problems of the conventional variable displacement pump, and is capable of suppressing an increase in the weight of the entire pump while suppressing an increase against the control pressure of the pump.
- the purpose is to provide a displacement pump.
- the present invention relates to a suction portion formed on at least one side of both inner side surfaces of a pump housing, and having an opening formed in a suction side region in which the volume of each hydraulic oil chamber increases when the rotor is rotationally driven, and the pump A discharge portion formed on at least one side of the both inner side surfaces of the housing and having an opening formed in a discharge side region in which the volume of each hydraulic oil chamber decreases as the rotor is driven to rotate;
- the discharge pressure is supplied, the discharge pressure is selectively selected by a first control oil chamber that applies a force to the movable member in a direction to reduce the volume change amount of each hydraulic oil chamber by the internal pressure, and a switching mechanism.
- a second control oil chamber that applies a force to the movable member in a direction in which the volume change amount of each hydraulic oil chamber is changed when supply / discharge or supply is interrupted to the pump, and the pump
- a first seal portion formed on both end surfaces of the movable member that slides on both inner side surfaces of the udging and seals between each of the hydraulic oil chambers and the first control oil chamber, and both end surfaces of the movable member In the discharge side region, the gap between each hydraulic oil chamber and the second control oil chamber is sealed, and the radial width is longer than the radial width of the first seal portion.
- a large second seal portion is formed on both end surfaces of the movable member that slides on both inner side surfaces of the udging and seals between each of the hydraulic oil chambers and the first control oil chamber, and both end surfaces of the movable member In the discharge side region, the gap between each hydraulic oil chamber and the second control oil chamber is sealed, and the radial width is longer than the radial width of the first seal portion.
- FIG. 2 is a cross-sectional view taken along line AA in FIG. It is the figure which looked at the pump body provided to this embodiment from the mating face side with a cover member. It is the figure which looked at the cover member provided to this embodiment from the mating surface side with a pump body. It is effect
- action explanatory drawing which shows the state which the eccentric amount of the cam ring of this embodiment reduced. It is a graph showing the hydraulic characteristic of the variable displacement pump which concerns on this embodiment. It is the schematic which shows the variable displacement pump which concerns on 2nd Embodiment of this invention. It is the schematic which shows the variable displacement pump which concerns on 3rd Embodiment of this invention.
- variable displacement pump is used to supply engine lubricating oil to a valve timing control device (VTC) for controlling opening / closing timing of a sliding portion of an automobile internal combustion engine and an engine valve.
- VTC valve timing control device
- This oil pump is provided, for example, at the front end of a cylinder block of an internal combustion engine (not shown). As shown in FIGS. 1 and 2, the oil pump has an opening formed at one end and a pump housing chamber 3 provided therein.
- a pump housing composed of a U-shaped pump body 1 and a cover member 2 that closes one end opening of the pump body 1, and is rotatably supported by the pump housing and penetrates substantially the center of the pump housing chamber 3.
- a drive shaft 4 that is rotationally driven by a crankshaft (not shown), is housed in the pump housing chamber 3 so as to be movable (swingable), and cooperates with first and second control oil chambers 21 and 22 and coil springs 23 described later.
- a cam ring 5 that changes the volume change amount of the pump chamber 13 and is housed on the inner peripheral side of the cam ring 5 and is driven to rotate counterclockwise in FIG.
- a pump structure which performs the pumping action by increasing or decreasing the volume of the pump chamber 13 is a plurality of hydraulic oil chamber formed between the ring 5.
- the pump housing (cover member 2) is provided with a pilot valve 30 which is a control mechanism for controlling supply / discharge of hydraulic pressure to the second control oil chamber 22 or shutting off supply. Further, on the control pressure introduction passage 60 described later formed between the pilot valve 30 and the discharge passage 18 described later, introduction of the discharged hydraulic oil to the pilot valve 30 side is switched and controlled. A solenoid valve 50 as a switching mechanism is provided.
- the pump structure is rotatably accommodated on the inner peripheral side of the cam ring 5 and has a rotor 6 whose central portion is coupled to the outer periphery of the drive shaft 4 and a plurality of slits radially formed in the outer peripheral portion of the rotor 6.
- the vane 7 is housed in a freely retractable manner in the inner part 6a, and a pair of ring members 8, 8 are formed on the inner peripheral side of the rotor 6 and have a smaller diameter than the rotor 6. Yes.
- the pump body 1 is integrally formed of an aluminum alloy material, and as shown in FIGS. 1 to 3, the pump body 1 is formed in a rectangular shape that is long in the vertical direction, and its width is longer than that in the vertical direction. It is formed small. Further, the pump body 1 is provided with a bearing hole 1b that rotatably supports the one end portion 4a of the drive shaft 4 at a substantially central position of the end wall 1a constituting the bottom wall of the pump housing chamber 3. Further, a support groove 1c having a substantially semicircular cross section for supporting the cam ring 5 in a swingable manner through a rod-like pivot pin 9 serving as a swing fulcrum is formed at a predetermined position on the inner peripheral wall of the pump storage chamber 3. Has been.
- a straight line (hereinafter referred to as "cam ring reference line”) M passing through the center of the bearing hole 1b and the center of the support groove 1c (pivot pin 9) is shown in FIG.
- a first seal slidable contact surface 1d is formed on the left half of the first seal member 10a.
- the first seal sliding contact surface 1d is formed in an arcuate surface shape having a predetermined radius R1 from the center of the support groove 1c.
- the first seal sliding contact surface 1d is set to have a circumferential length that allows the first seal member 10a to always slide in a range in which the cam ring 5 swings eccentrically.
- a second seal slidable contact surface 1e with which the second seal member 10b disposed on the outer peripheral portion of the cam ring 5 is slidably contacted is formed.
- the second seal sliding contact surface 1e is formed in an arcuate surface shape having a predetermined radius R2 from the center of the support groove 1c. Further, the second seal sliding contact surface 1e is set to a circumferential length that allows the second seal member 10b to always slide in a range in which the cam ring 5 swings eccentrically.
- a circle constituting a low-pressure chamber 41 described later is formed between the support groove 1c on the inner peripheral surface of the pump housing chamber 3 and the first control oil chamber 21 defined by the first seal sliding contact surface 1d.
- An arcuate groove 40 is formed.
- a third seal sliding contact surface 1f is formed on the inner surface of the concave groove 40 on the first control oil chamber 21 side so that the third seal member 10c disposed on the outer peripheral portion of the cam ring 5 is in sliding contact therewith.
- the third seal sliding contact surface 1f is formed in an arcuate surface shape having a predetermined radius R3 from the center of the support groove 1c.
- the third seal sliding contact surface 1f is set to a circumferential length that allows the third seal member 10c to always slide in a range in which the cam ring 5 swings eccentrically.
- the concave groove 40 is formed on the left side of the pivot pin 9 in the drawing, and the whole is formed in an arc shape along the vertical direction from the inner peripheral surface of the pump body 1. .
- suction side region a region in which the volume of each pump chamber 13 expands due to the pump action by the pump component.
- discharge side region is a suction port 11a that is a substantially arc-shaped concave suction portion and an area where the volume of each pump chamber 13 is reduced.
- a discharge port 12a which is a substantially arc-shaped discharge portion, is formed so as to open. The suction port 11a and the discharge port 12a are notched so as to face each other substantially vertically with the bearing hole 1b interposed therebetween.
- the discharge side region in the present embodiment is formed between the start end S and the end F of the discharge port 12a in the rotation direction of the drive shaft 4 (rotor 6).
- the suction port 11a is integrally provided with an introduction portion 11b formed so as to bulge toward the spring accommodating chamber 16 described later at a substantially intermediate position in the circumferential direction.
- a suction port 11c that penetrates through the end wall 1a of the pump body 1 and opens to the outside is formed in the vicinity of the boundary between the introduction portion 11b and the suction port 11a. Accordingly, the oil stored in the oil pan 43 of the internal combustion engine is sucked into the pump chambers 13 in the suction region through the suction port 11c and the suction port 11a based on the negative pressure generated by the pump action of the pump component. It has become so.
- the discharge port 12a is formed with a discharge port 12b penetrating through the end wall 1a of the pump body 1 on the end F side and opening to the outside. Accordingly, the oil pressurized by the pump action and discharged to the discharge port 12a passes through the discharge passage 18 provided in the cylinder block from the discharge port 12b as shown in FIG. To the sliding parts in the engine, VTC, and the like. An oil cooler and an oil filter 70 are provided on the downstream side of the discharge passage 18.
- a communication groove 15 that communicates the discharge port 12a and the bearing hole 1b is formed in the discharge port 12a.
- the oil is supplied from the communication groove 15 to the bearing hole 1b, and the oil is also supplied to the side portions of the rotor 6 and the vanes 7, thereby ensuring good lubrication of the sliding portions.
- the cover member 2 has a substantially plate shape and is formed in a rectangular shape that is long in the vertical direction following the outer shape of the pump body 1. Further, the cover member 2 is attached to the mounting surface 1g on the opening side of the pump housing chamber 3 of the pump body 1 at the outer peripheral side of the inner side surface 2b by a plurality of bolts not shown. In addition, a bearing hole 2a that rotatably supports the other end 4b having a large diameter of the drive shaft 4 is formed through the position facing the bearing hole 1b of the pump body 1.
- the suction port 11 a ′, the discharge port 12 a ′, and the communication groove 15 ′ are also provided on the inner surface 2 b of the cover member 2, and the suction port 11 a, the discharge port 12 a, and the communication groove of the pump body 1.
- 15 is arranged opposite to the main body.
- the suction port and the discharge port may be formed on either the pump body 1 side or the cover member 2 side.
- the drive shaft 4 has a small-diameter end 4 a that is pivotally supported by a bearing hole 1 b in the end wall 1 a of the pump body 1.
- the other end portion 4b having a large diameter of the drive shaft 4 is supported by the bearing hole 2a of the cover member 2 and is linked to a crankshaft or the like with the tip side facing outside.
- the drive shaft 4 rotates the rotor 6 in the clockwise direction (arrow direction) in FIG. 1 based on the rotational force transmitted from the crankshaft.
- the rotor 6 has a plurality of slits 6a formed radially from the center side to the outside in the radial direction.
- a back pressure chamber 6b having a substantially circular cross section is provided at the inner base end of each slit 6a to introduce discharge oil, which is hydraulic oil. Accordingly, each vane 7 is pushed outward by the centrifugal force accompanying the rotation of the rotor 6 and the pressure in the back pressure chamber 6b.
- Each vane 7 is configured such that, when the rotor 6 rotates, each distal end surface is in sliding contact with the inner peripheral surface of the cam ring 5, and each proximal end surface is in sliding contact with the outer peripheral surface of each of the ring members 8, 8. .
- the cam ring 5 is integrally formed in a substantially cylindrical shape by a so-called sintered alloy, and a substantially arc-shaped groove-like pivot that fits into the pivot pin 9 is provided at a predetermined position on the outer peripheral portion thereof.
- the part 5a is notched along the axial direction.
- an arm portion 5b linked to a coil spring 23, which is an urging member described later, set to a predetermined spring constant is provided in the radial direction. Protruding along.
- a spring accommodating chamber 16 is provided at a position facing the support groove 1 c at the inner lower end position of the pump body 1.
- the coil spring 23 to which a predetermined set load K is applied is elastically mounted between the one end wall and one side surface of the arm portion 5b.
- the other end wall of the spring accommodating chamber 16 is configured as a regulating surface 16 a that regulates the moving range of the cam ring 5 in the eccentric direction. That is, when the other side surface of the arm portion 5b comes into contact with the regulation surface 16a, further movement (swing) in the eccentric direction of the cam ring 5 is regulated.
- the cam ring 5 is constantly urged by the urging force of the coil spring 23 in the direction of increasing eccentricity (clockwise in FIG. 1) via the arm portion 5b. That is, in the non-operating state, the cam ring 5 is in a state where the other side surface of the arm portion 5b is pressed against the regulating surface 16a as shown in FIG. It has become.
- the outer periphery of the cam ring 5 is provided to face the first, second, and third seal sliding contact surfaces 1d, 1e, and 1f formed by the inner peripheral wall of the pump body 1, and each of these seal sliding contact surfaces.
- First, second, and third seal constituent portions 5c, 5d, and 5e that are concentric arcs with 1d, 1e, and 1f are formed to protrude.
- the first and second sliding contacts are accommodated and held, respectively.
- the first, second, and third seal members 10a to 10c are all elongated in a straight line along the axial direction of the cam ring 5 with a fluorine-based resin material having low friction characteristics. Further, the seal members 10a to 10c are pressed against the seal sliding contact surfaces 1d to 1f by the elastic force of rubber elastic members respectively provided at the bottoms of the seal holding grooves. A liquid-tight seal is provided between the contact surfaces 1d to 1f and each sealing surface.
- first control oil chamber 21 is defined between the first seal member 10a and the third seal member 10c.
- the second control oil chamber 22 is defined between the pivot pin 9 and the second seal member 10b. Further, the low pressure chamber 41 is separated between the pivot pin 9 and the third seal member 10c.
- the first pressure receiving surface 5 f facing the first control oil chamber 21 in the outer peripheral surface of the cam ring 5 is formed small by the presence of the low pressure chamber 41 between the pivot pin 9 and the circumferential direction from the pivot pin 9.
- the second pressure receiving surface 5g facing the second control oil chamber 22 that extends greatly is formed larger. For this reason, when the same hydraulic pressure (discharge pressure) is applied to both the first and second control oil chambers 21 and 22, the cam ring moves in the direction of increasing the eccentric amount as a whole (clockwise in FIG. 1). 5 is energized.
- the pump discharge pressure is guided to the first and second control oil chambers 21 and 22 through a control pressure introduction passage 60 branched from the discharge passage 18. That is, the pump discharge pressure is supplied to the first control oil chamber 21 via the first introduction passage 61 that is one branch passage branched further from the control pressure introduction passage 60.
- pump discharge pressure is supplied to the second control oil chamber 22 through the electromagnetic switching valve 50 and the pilot valve 30 through the second introduction passage 62 which is the other branch passage.
- the low pressure chamber 41 is formed along the vertical direction of the pump body 1 by the concave groove 40 and is connected to the cover member 2 through the communication hole 42 formed through the cover member 2.
- the oil pan 43 communicates with the outside, being open to the atmosphere. That is, in the low pressure chamber 41, oil leaked from the sliding surfaces (side clearances) between the axial end surfaces 5h and 5i of the cam ring 5 and the pump body 1 and the cover member 2 as will be described later. In addition, so-called contamination mixed in the oil flows in. These oils and contaminants are discharged into the oil pan 43 through the communication hole 42.
- the communication hole 42 is disposed near the pivot pin 9 on the lower side in the gravity direction of the low pressure chamber 41. Further, the communication hole 42 is formed substantially horizontally by a small and narrow long hole penetrating the wall portion of the cover member 2, and one end portion 42 a is formed at the bottom side of the low pressure chamber 41 and the other end portion 42 b is formed. An opening is formed in the outer surface of the cover member 2 and faces the oil pan 43.
- the one end portion 42 a of the communication path 42 is formed at a position where the low pressure chamber 41 and the oil pan 43 are always communicated with each other without being blocked by the cam ring 5 at any swing position of the cam ring 5.
- the first control oil chamber 21 and the second control oil chamber 22 are provided between the pump chambers 13 in the axial direction on both end surfaces 5h, 5i and the both end surfaces 5h, 5i. Is sealed by a so-called side clearance between the bottom surface 3a as one side inner surface of the pump housing chamber 3 of the pump body 1 and the other side inner surface 2b of the cover member 2.
- the low-pressure chamber 41 is also sealed with each pump chamber 13 by a side clearance between both end surfaces 5h and 5i of the cam ring 5 and the bottom surface 3a of the pump housing chamber 3 and the inner surface 2b of the cover member 2. .
- the cam ring 5 has a first seal portion that seals between the first control oil chamber 21 and each pump chamber 13 in both end faces 5 h and 5 i that constitute the side clearance.
- the first seal surface 44 is a part.
- a portion that seals between the second control oil chamber 22 and each pump chamber 13 is a second seal surface 45 that is a second seal portion.
- a portion that seals between the low pressure chamber 41 and each pump chamber 13 in the discharge side region is configured as a third seal surface 46 that is a third seal portion.
- the first to third seal portions 44 to 46 are formed on both end faces 5h and 5i of the cam ring 5, but only the one end face 5h side shown in FIG. 1 will be described below for convenience.
- the second seal surface 45 and the third seal surface 46 are formed to have substantially the same radial width W2 and the radial width W2 of the first seal surface 44 is the same. It is formed to be larger than the width W1 in the radial direction.
- each pump chamber 13 in which the first control oil chamber 21 is located is a suction side region facing the suction ports 11a and 11a ′, and in this suction region, each pump chamber 13 has a negative pressure (low pressure). It is in a state. For this reason, the hydraulic pressure acting on the first seal surface 44 is in a low pressure state.
- each pump chamber 13 in which the second control oil chamber 22 and the low pressure chamber 41 are located has a discharge side region where the discharge ports 12a and 12a ′ face (between the start end S and the end F of the discharge ports 12a and 12a ′). In this discharge side region, the inside of each pump chamber 13 is in a positive pressure (high pressure) state. For this reason, the hydraulic pressure acting on the second seal surface 45 and the third seal surface 46 is in a high pressure state.
- the pump housing is formed by forming the radial width W2 of the second and third seal portions 45 and 46 larger than the width W1 of the first seal surface 44 in the width direction.
- the seal areas of the second and third seal portions 45 and 46 formed in a relative relationship with the bottom surface 3 a of the chamber 3 were formed larger than the seal area of the first seal surface 44.
- the average width length W1 in the radial direction of the first seal surface 44 is set to about 3.5 mm, while the second and third seal portions 45,
- the average width length W2 of 46 in the radial direction is set to about 5.0 mm, which is larger than the average width length W1.
- the pilot valve 30 is disposed along the lateral direction at the upper end in the longitudinal direction provided by being overlapped with the cover member 2 of the pump body 1.
- the pilot valve 30 is formed in a cylindrical valve body 31 that extends to the outside of the cover member 2, a plug 32 that closes the bottom opening of the valve body 31, and an inner axial direction of the valve body 31.
- the hydraulic pressure is supplied to the second control oil chamber 22 by a pair of first and second land portions 33a and 33b which are slidably received in the valve receiving hole 31a and slidably contact the inner peripheral surface of the valve body 31.
- the spool valve body 33 used for the exhaust control and the plug body 32 are elastically mounted with a predetermined set load between the plug 32 and the spool valve body 33 on the inner periphery on the other end side of the valve body 31. And a valve spring 34 that is always urged toward the center.
- an introduction port 63 connected to the solenoid valve 50 via a downstream passage (hereinafter referred to as a downstream passage) 62a of the second introduction passage 62 is formed. Further, inside the valve body 31 and the pump body 1, one end side is connected to the second control oil chamber 22 at its axially intermediate position, and the other end side is always connected to a relay chamber 31 b described later. As a result, the supply / discharge port 64 for supplying and discharging hydraulic pressure to and from the second control oil chamber 22 is formed.
- one end side is directly connected to the outside or the suction side at the substantially central position in the axial direction of the peripheral wall of the valve body 31, and the connection with the relay chamber 31 b described later is switched, thereby allowing the first through the relay chamber 31 b.
- the first drain port 65 used for discharging the hydraulic pressure in the control oil chamber 22 is formed with an opening.
- a second drain port 66 connected directly to the outside or connected to the suction side is formed in an axial position overlapping with a back pressure chamber described later of the valve body 31. .
- a communication oil passage 67 that communicates with a relay chamber 31b described later is formed in the peripheral wall of the valve body 31 in a state where the spool valve body 33 is in the position on the left end side in FIG. Has been.
- the spool valve body 33 has a small-diameter shaft portion 33c provided between the first and second land portions 33a and 33b at both end portions in the axial direction.
- the spool valve body 33 is formed on the outer end side in the axial direction of the first land portion 33a in the valve body 31, and is provided on the outer periphery of the pressure chamber 68 through which the discharge pressure is guided from the introduction port 63 and the small diameter shaft portion 33c.
- a relay chamber 31b that is formed and relays between the supply / discharge port 64 and the communication oil passage 67 or the first drain port 65 according to the axial position of the spool valve body 33, and is provided between the second land portion 33b and the plug 42. And a back pressure chamber for discharging oil leaked from the relay chamber 31b through the outer peripheral side (a minute gap) of the second land portion 33b.
- the pilot valve 30 has a spool valve element 33 by the urging force of the valve spring 34 when the discharge pressure guided from the introduction port 63 to the pressure chamber 68 is equal to or lower than a predetermined pressure (spool operating oil pressure Ps described later).
- a predetermined pressure spool operating oil pressure Ps described later.
- the second control oil chamber 22 and the relay chamber 31b communicate with each other via the supply / discharge port 64.
- the hydraulic pressure guided from the downstream side passage 62 a through the communication oil passage 67 is supplied to the second control oil chamber 22 via the relay chamber 31 b and the supply / discharge port 64.
- the spool valve body 33 moves from one end side to the other end side against the urging force of the valve spring 34, and passes through the supply / discharge port 64.
- the second control oil chamber 22 is maintained in communication with the relay chamber 31b.
- the relay chamber 31b and the oil pan 43 are communicated with each other through the first drain port 65 almost simultaneously.
- the oil in the second control oil chamber 22 is switched so as to be discharged from the first drain port 65 to the oil pan 43 through the supply / discharge port 64 and the relay chamber 31b.
- both the communication oil passage 67 and the first drain port 65 are communicated with the supply / discharge port 64 for a short time at the switching timing, or both are shut off for a short time.
- the solenoid valve 50 is housed and disposed in a valve housing hole (not shown) interposed in the middle of the control pressure introduction passage 60.
- the solenoid valve 50 includes a cylindrical valve body 51 in which an oil passage 54 is formed so as to penetrate along the inner axial direction, and an upstream side of the second introduction passage 62 that is fixed inside the tip end side of the oil passage 54.
- a seat member 52 having an introduction port 55 to be connected, and a ball valve body 53 provided so as to be detachable from a valve seat formed at an opening edge of the inner end portion of the seat member 52 and serving to open and close the introduction port 55.
- a solenoid 56 provided at the other end of the valve body 51.
- the valve body 51 is formed with a valve seat similar to the valve seat included in the seat member 52 at the opening edge of the inner end portion of the valve body housing portion 57 that houses the ball valve body 53. Further, a supply / discharge port 58 connected to the downstream side passage 62a for supplying / discharging hydraulic pressure to / from the pilot valve 30 is formed on the outer peripheral portion of the valve body accommodating portion 57 on one end side of the peripheral wall of the valve body 51. A penetration is formed along the direction. Further, a drain port 59 communicating with the oil pan 43 is formed through the outer peripheral portion of the oil passage 54 on the other end side along the radial direction.
- the armature disposed on the inner peripheral side of the coil and the rod 56a fixed thereto are moved downward in FIG. 1 by electromagnetic force generated by energizing the coil accommodated in the casing. And are moving forward.
- the solenoid 56 is energized with an exciting current from an in-vehicle ECU (not shown) based on an engine operating state detected or calculated based on predetermined parameters such as the oil temperature and water temperature of the internal combustion engine and the engine speed.
- the required oil pressure of the internal combustion engine which serves as a reference for the discharge pressure control of the oil pump, will be described with reference to FIG.
- the engine required oil pressure corresponding to the required oil pressure of the VTC is shown.
- P2 indicates the required engine oil pressure corresponding to the required oil pressure of the oil jet used for cooling the piston, and the required engine oil pressure required for lubrication of the bearing portion of the crankshaft at the time of high engine rotation.
- a connection between these points P1 and P2 by a solid line represents an ideal required oil pressure (discharge pressure) P corresponding to the engine speed of the internal combustion engine.
- Pc in the figure indicates a cam ring hydraulic pressure at which the cam ring 5 starts moving in the concentric direction against the biasing force of the coil spring 23 based on the set load K.
- Ps is a spool in which the spool valve element 33 starts to move from the position on one end side to the position on the other end side against the biasing force of the valve spring 34 based on the set load K1, and the opening of the first drain port 65 starts. The hydraulic pressure is shown.
- the excitation current is supplied to the solenoid 56 of the electromagnetic switching valve 50, and the introduction port 55 and the supply / discharge port 58 are switched. Communication is interrupted. On the other hand, the supply / discharge port 58 and the drain port 59 communicate with each other. Thereby, the discharge pressure P is not introduced into the second control oil chamber 22 (pilot valve 30) side. Therefore, the spool valve element 33 of the pilot valve 30 is held at the maximum left position shown in FIG.
- the oil in the second control oil chamber 22 is discharged from the drain port 59 of the solenoid valve 50 into the oil pan 43 via the downstream side passage 62a and the oil passage 54, and discharged only to the first control oil chamber 21.
- Pressure P is supplied.
- the discharge pressure (in-engine oil pressure) P is lower than the cam ring operating oil pressure Pc.
- the cam ring 5 is held in the maximum eccentric state, and the discharge pressure P has a characteristic of increasing in a manner substantially proportional to the engine speed.
- the discharge pressure P rises and reaches the spool operating oil pressure Ps based on the increase characteristic, the discharge pressure P is introduced from the introduction port 63 into the pressure chamber 68 by the pilot valve 30. 33 moves to the plug 32 side against the urging force of the valve spring 34, and its position is switched from one end side to the other end side.
- valve housing 31a side opening of the communication oil passage 67 is blocked by the first land portion 33a.
- the supply / exhaust port 64 and the first drain port 65 communicate with each other via the relay chamber 31b, whereby the oil in the second control oil chamber 22 is discharged and decompressed, and becomes lower than the discharge pressure P.
- the urging force in the concentric direction based on the internal pressure of the first control oil chamber 22 exceeds the urging force in the eccentric direction consisting of the resultant force of the urging force of the coil spring 23 and the urging force based on the internal pressure of the second control oil chamber 22.
- the cam ring 5 moves in the concentric direction as shown in FIGS.
- the connection between the supply / discharge port 64 communicating with the second control oil chamber 22 and the communication oil passage 67 or the first drain port 65 is continuously alternated by the spool valve element 33 of the pilot valve 30.
- the discharge pressure P is adjusted to be maintained at the spool operating oil pressure Ps.
- the pressure adjustment is performed by switching the supply / discharge port 64 in the pilot valve 30, it is not affected by the spring constant of the coil spring 23. Further, since the pressure adjustment is performed within a very narrow stroke range of the spool valve element 33 related to the switching of the supply / discharge port 64, there is no possibility of being influenced by the spring constant of the valve spring 34. As a result, in this section, the discharge pressure P of the oil pump does not increase proportionally with the increase in the engine speed, but has a substantially flat characteristic, and can be as close as possible to the ideal required oil pressure.
- the oil pump according to the present embodiment is based on the pressure regulation control by the pilot valve 30 in the engine speed range (section d in FIG. 6) that is required to be maintained at a high predetermined pressure (spool operating oil pressure Ps).
- the discharge pressure P can be maintained at this high pressure.
- the radial width W2 of the second and third seal portions 45, 46 of the cam ring 5 is set to be larger than the radial width W1 of the first seal surface 44.
- the radial width W2 of the second and third seal portions 45 and 46 is increased to increase the seal area from each pump chamber 13 to the second. Oil leakage into the control oil chamber 22 and the low pressure chamber 41 can be sufficiently suppressed.
- the radial width of the cam ring 5 is not thickened as a whole, but only the second and third seal portions 45 and 46 are only partially thickened. Therefore, since the radial width W1 is relatively thin on the first seal surface 44 side in the low pressure suction region, an increase in the weight of the cam ring 5 can be suppressed. As a result, an increase in the weight of the entire oil pump can be suppressed.
- the first pressure receiving surface 5f located in the first control oil chamber 21 of the cam ring 5 becomes relatively small.
- the pressure receiving area of the surface 5f is larger than the pressure receiving area of the second pressure receiving surface 5g located in the second control oil chamber 22.
- FIG. 7 shows a second embodiment of the present invention, in which the oil pump is disposed opposite to the left and right of the first embodiment, and the rotation direction of the drive shaft 4 is counterclockwise (arrow direction) in the figure. It has become. Furthermore, the low pressure chamber 41 in the first embodiment is eliminated. Since the basic structure of the oil pump is the same as that of the first embodiment, the same reference numerals are given and detailed description is omitted.
- the cam ring 5 is arranged in the left and right direction opposite to that of the first embodiment, and accordingly, the first control oil chamber 21 is on the right side in the figure, and the second control oil chamber 22 is in the figure. They are arranged on the left side.
- the suction port 11a is located on the lower side in the figure and partially overlaps with the first control oil chamber 21 in the radial direction, while the discharge port 12a is located on the upper side in the figure and most of it. Is overlapped with the second control oil chamber 22 in the radial direction.
- the discharge side region is from the start end S to the end F of the discharge port 12a in the rotation direction of the drive shaft 4, and each pump chamber is provided by the second seal surface 45 in this region. 13 and the second control oil chamber 22 are sealed.
- FIG. 8 shows a third embodiment of the present invention, and the basic structure is similar to that of the second embodiment, but both the first control oil chamber 21 and the second control oil chamber 22 are on the right side of the pivot pin 9.
- the oil chamber 47 on the left side of the pivot pin 9 is a low-pressure chamber that communicates with the suction port 11a. Further, the pilot valve in each of the above embodiments is eliminated. Then, the pump discharge pressure is supplied to and discharged from the second control oil chamber 22 from the downstream passage 62a of the second introduction passage 62 branched from the discharge passage 18 only through the electromagnetic switching valve 50. .
- the pump discharge pressure supplied to the second control oil chamber 22 cooperates with the pump discharge pressure of the first control oil chamber 21 to cause the cam ring 5 to resist the spring force of the coil spring 23 in the clockwise direction in the figure. That is, it is made to swing in the concentric direction.
- the pump discharge pressure is supplied from the first introduction passage 61 to the first control oil chamber 21 as in the above embodiments.
- Each pump chamber 13 inside the cam ring 5 of the first control oil chamber 21 faces the discharge port 12a. Therefore, the cam ring 5 has an inner and outer surface on which inner and outer surfaces are subjected to substantially uniform pressures of both the pump discharge pressure in the first control oil chamber 21 and the high hydraulic pressure at the initial compression stage by the pump structure. Yes.
- the width W1 in the radial direction of the portion of the cam ring 5 between the first control oil chamber 21 and each pump chamber 13 is formed sufficiently small. That is, in this part, almost uniform oil pressure is applied inside and outside, so even if the width W1 of the first seal surface 44 is small, there is almost no oil leakage from each pump chamber 13 to the first control oil chamber 21. .
- the drive shaft 4 rotates counterclockwise (arrow direction) in the figure as in the second embodiment.
- the discharge side region in the present embodiment is from the end F ′ of the suction port 11a to the start end S of the discharge port 12a, and the width W2 in the radial direction of the first seal surface 45 of the cam ring 5 in this interval is the first.
- the first seal surface 44 on the one control oil chamber 21 side is formed sufficiently larger than the radial width W1.
- the radial width W2 of the second seal surface 45 is large, but the radial width W1 of the first seal surface 44 is small, so that the weight increases. It is the same as that of each embodiment that it can suppress.
- the present invention is not limited to the configuration of the above-described embodiment.
- suction is performed from the end F of the discharge port 12a in the rotation direction of the rotor 6. It is also possible to be between the start end S ′ of the port 11a.
- the contrast between the radial width lengths W1 and W2 of the first seal surface 44 and the second seal surface 45 (46) is the average width length. It is also possible to target the length or the minimum width length.
- the communication hole 42 is communicated with the oil pan 43 (atmosphere) on the low pressure side, but may be communicated with the suction port 11c side where negative suction pressure is generated in some cases. Is possible.
- the low-pressure chamber 41 is formed in a relatively large arc shape through the concave groove 40, but may be of a size that allows inflow and collection of contaminants and the like, and can be formed smaller. .
- the orientation of the pump housing when it is attached to an engine cylinder block or the like can be arbitrarily selected, and can be freely changed according to the size and specifications of the engine, for example.
- a vane type pump is used as the oil pump.
- a gear pump may be used.
- variable displacement pump based on the embodiment described above, for example, the following modes can be considered.
- variable displacement pump has a rotor that is rotationally driven, a plurality of vanes that can be projected and retracted on an outer periphery of the rotor, and the rotor and the plurality of vanes on the inner peripheral side.
- a plurality of hydraulic oil chambers are separated by housing, and the volume change amount of each hydraulic oil chamber during the rotation of the rotor by moving so that the inner peripheral center changes with respect to the rotation center of the rotor.
- a ring-shaped movable member for changing the shape a pump housing in which the rotor, vane, and movable member are housed, and both end surfaces in the axial direction of the movable member are slidably contactable on both opposed inner surfaces, and the pump housing A suction portion formed on at least one side of the both inner side surfaces of the first and second openings, and an opening formed in a suction side region in which the volume of each hydraulic oil chamber increases as the rotor rotates.
- a discharge portion formed on at least one side of the both inner surfaces of the pump housing and having an opening formed in a discharge side region in which the volume of each hydraulic fluid chamber decreases as the rotor is driven to rotate; and from the discharge portion When the discharged discharge pressure is supplied, a first control oil chamber that applies a force to the movable member in a direction to reduce the volume change amount of each hydraulic oil chamber by the internal pressure, and the discharge pressure by the switching mechanism.
- the second control oil chamber applies a force to the movable member in a direction in which the volume change amount of each hydraulic oil chamber is increased by the hydraulic oil supplied from the discharge unit. ing.
- the average width length in the radial direction of the second seal portion is formed longer than the average width length in the radial direction of the first control oil chamber.
- the minimum width length in the radial direction of the second seal portion is formed longer than the minimum width length in the radial direction of the first seal portion.
- the radial maximum width length of the second seal portion is longer than the radial maximum width length of the first seal portion.
- the suction part and the discharge part are formed in an arc shape along the moving direction of the movable member, and the end of the suction part and the end of the discharge part in the rotation direction of the rotor
- Between the hydraulic oil chamber and the second control oil chamber in the discharge side region is a width in the radial direction of the second seal portion. It is formed larger than the width in the radial direction of the part.
- the movable member is a cam ring that increases or decreases the volume of each hydraulic oil chamber by swinging about a swing fulcrum.
- the hydraulic oil is provided between a swing fulcrum of the movable member and the first control oil chamber and communicates with the low pressure side, and the hydraulic oil in the discharge side region is provided.
- the radial width length of the third seal portion formed on both end faces of the movable member that seals between the chamber and the third control oil chamber is greater than the radial width length of the first seal portion. Also formed large.
- the width of the second seal portion in the radial direction is about 3.5 mm or more.
- the discharge side region is between the start end and the end of the discharge portion in the rotation direction of the rotor.
- the discharge side region is between the end of the discharge unit and the start of the suction unit in the rotation direction of the rotor.
- the discharge side region is between the end of the suction portion and the start end of the discharge portion in the rotation direction of the rotor.
- variable displacement pump a pump housing in which a pump structure that discharges the working fluid sucked from the suction portion and discharged from the discharge portion by changing the volumes of the plurality of pump chambers in the pump storage chamber; An annular movable member that is disposed in the pump accommodating chamber and moves to change the volume change amount of the plurality of pump chambers, and the hydraulic fluid discharged from the discharge unit is supplied, thereby the plurality of the plurality of pump chambers.
- a first control oil chamber that applies an urging force to the movable member in a direction to reduce the volume of the pump chamber, and the supply or discharge or supply of hydraulic fluid is selectively interrupted from the discharge section via a passage;
- a second control oil chamber for controlling the movable member in a direction in which the volumes of the plurality of pump chambers are changed, and a hydraulic pressure supply / discharge to the second control oil chamber in accordance with a discharge pressure of the hydraulic fluid from the discharge portion.
- a control mechanism that controls, a switching mechanism that is provided on a control pressure introduction passage formed between the control mechanism and the discharge portion, and that switches and controls the introduction of the discharged hydraulic fluid to the control mechanism side; and A first seal portion that is formed on both end surfaces of the movable member that slides on opposing inner surfaces of the pump housing, and seals between the pump chambers and the first control oil chamber on the suction portion side; A second seal portion that is formed on both end surfaces of the movable member that slides on the inner surface of the pump housing and seals between each pump chamber and the second control oil chamber on the discharge portion side; The amount of hydraulic fluid leaking from each pump chamber on the discharge portion side to the second control oil chamber via the second seal portion is measured from the pump chamber on the suction portion side via the first seal portion. 1 Less than the amount of hydraulic fluid leaking to the control oil chamber.
- the radial width length of the second seal portion of the movable member is formed larger than the radial width length of the first seal portion.
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Abstract
Description
〔第1実施形態〕
このオイルポンプは、例えば、図外の内燃機関のシリンダブロックの前端部に設けられ、図1及び図2に示すように、一端側が開口形成され内部にポンプ収容室3が設けられた縦断面ほぼコ字形状のポンプボディ1及び該ポンプボディ1の一端開口を閉塞するカバー部材2とからなるポンプハウジングと、このポンプハウジングに回転自在に支持され、ポンプ収容室3のほぼ中心部を貫通して図外のクランクシャフトにより回転駆動される駆動軸4と、ポンプ収容室3内に移動(揺動)可能に収容され、後述する第1,第2制御油室21,22やコイルばね23と協働してポンプ室13の容積変化量を変更させるカムリング5と、該カムリング5の内周側に収容され、駆動軸4によって図1中の反時計方向に回転駆動されることによって、カムリング5との間に形成される複数の作動油室であるポンプ室13の容積を増減させることによってポンプ作用を行うポンプ構成体と、を備えている。
〔オイルポンプの作用〕
以下に、本実施形態に係るオイルポンプの作用について説明する。
〔第2実施形態〕
図7は本発明の第2実施形態を示し、オイルポンプの配置を第1実施形態のものに対して左右逆に配置すると共に、駆動軸4の回転方向が図中反時計方向(矢印方向)になっている。さらに、第1実施形態における低圧室41を廃止したものである。なお、オイルポンプの基本構造は第1実施形態と同じであるから、同一の符番を付して具体的な説明は省略する。
〔第3実施形態〕
図8は本発明の第3実施形態を示し、基本構造は第2実施形態に類似しているが、第1制御油室21と第2制御油室22の両方が前記ピボットピン9の右側に配置されていると共に、ピボットピン9の左側の油室47は吸入ポート11aと連通した低圧室になっている。また、前記各実施形態におけるパイロット弁が廃しされている。そして、第2制御油室22には、吐出通路18から分岐した第2導入通路62の下流側通路62aから電磁切換弁50のみを介してポンプ吐出圧が給排制御されるようになっている。
前記吐出部側における各ポンプ室から前記第2シール部を介して第2制御油室へリークする作動液のリーク量を、前記吸入部側における各ポンプ室から前記第1シール部を介して第1制御油室へリークする作動液のリーク量よりも少なくした。
Claims (14)
- 回転駆動されるロータと、
該ロータの外周部に出没可能に設けられた複数のベーンと、
前記ロータと前記複数のベーンとをその内周側に収容することによって複数の作動油室を隔成すると共に、前記ロータの回転中心に対して内周中心が変化するように移動することによって前記ロータの回転時における前記各作動油室の容積変化量を変更させる円環状の可動部材と、
内部に前記ロータやベーン及び可動部材を収容し、対向する両内側面に前記可動部材の軸方向の両端面が摺接自在なポンプハウジングと、
前記ポンプハウジングの前記両内側面の少なくとも一方側に形成され、前記ロータが回転駆動することによって前記各作動油室の容積が増大する吸入側領域に開口形成された吸入部と、
前記ポンプハウジングの前記両内側面の少なくとも一方側に形成され、前記ロータが回転駆動することによって前記各作動油室の容積が減少する吐出側領域に開口形成された吐出部と、
前記吐出部から吐出された吐出圧が供給されることによって、その内圧により前記各作動油室の容積変化量を減少させる方向へ前記可動部材に力を付与する第1制御油室と、
切換機構によって前記吐出圧が選択的に給排、または供給が遮断されることによって、前記各作動油室の容積変化量を変化させる方向へ前記可動部材に力を付与する第2制御油室と、
前記ポンプハウジングの両内側面に摺動する前記可動部材の両端面に形成されて、前記各作動油室と前記第1制御油室との間をシールする第1シール部と、
前記可動部材の両端面に形成されて、前記吐出側領域において、前記各作動油室と第2制御油室との間をシールすると共に、径方向の幅長さが前記第1シール部の径方向の幅長さよりも大きく形成された第2シール部と、
を備えたことを特徴とする可変容量形ポンプ。 - 請求項1に記載の可変容量形ポンプにおいて、
前記第2制御油室は、前記吐出部から供給された吐出圧によって前記各作動油室の容積変化量を増加させる方向へ前記可動部材に力を付与することを特徴とする可変容量形ポンプ。 - 請求項1に記載の可変容量形ポンプにおいて、
前記第2シール部の径方向の平均幅長さを、前記第1制御油室の径方向の平均幅長さよりも長く形成したことを特徴とする可変容量形ポンプ。 - 請求項1に記載の可変容量形ポンプにおいて、
前記第2シール部の径方向の最小幅長さを、前記第1シール部の径方向の最小幅長さよりも長く形成したことを特徴とする可変容量形ポンプ。 - 請求項1に記載の可変容量形ポンプにおいて、
前記第2シール部の径方向の最大幅長さを、前記第1シール部の径方向の最大幅長さよりも長く形成したことを特徴とする可変容量形ポンプ。 - 請求項1に記載の可変容量形ポンプにおいて、
前記吐出側領域は、前記ロータの回転方向における前記吸入部の終端と前記吐出部の終端との間に形成されていることを特徴とする可変容量形ポンプ。 - 請求項1に記載の可変容量形ポンプにおいて、
前記吐出側領域を、前記ロータの回転方向における前記吐出部の始端から終端までの間としたことを特徴とする可変容量形ポンプ。 - 請求項1に記載の可変容量形ポンプにおいて、
前記吐出側領域を、前記ロータの回転方向における前記吐出部の終端から前記吸入部の始端までの間としたことを特徴とする可変容量形ポンプ。 - 請求項1に記載の可変容量形ポンプにおいて、
前記吐出側領域を、前記ロータの回転方向における前記吸入部の終端から前記吐出部の始端までの間としたことを特徴とする可変容量形ポンプ。 - 請求項1に記載の可変容量形ポンプにおいて、
前記可動部材は、揺動支点を中心に揺動することによって、前記各作動油室の容積変化量を増減変化させるカムリングであることを特徴とする可変容量形ポンプ。 - 請求項10に記載の可変容量形ポンプにおいて、
前記可動部材の移動支点と前記第1制御油室との間に設けられ、低圧側に連通する第3制御油室を備え、
前記吐出側領域における前記作動油室と前記第3制御油室との間をシールする前記可動部材の両端面に形成された前記第3シール部の径方向の幅長さは、前記第1シール部の径方向の幅長さよりも大きく形成されていることを特徴とする可変容量形ポンプ。 - 請求項2に記載の可変容量形ポンプにおいて、
前記第2シール部の径方向の幅長さは、約3.5mm以上に形成されていることを特徴とする可変容量形ポンプ。 - 複数のポンプ室の容積が変化して吸入部から吸入された作動液を吐出部から吐出するポンプ構成体をポンプ収容室に収容したポンプハウジングと、
前記ポンプ収容室内に配置され、移動することによって前記複数のポンプ室の容積変化量を変更させる可動部材と、
前記吐出部から吐出された作動液が供給されることによって、前記複数のポンプ室の容積変化量を減少させる方向へ前記可動部材に付勢力を付与する第1制御油室と、
前記吐出部から通路を介して作動液が選択的に給排または供給が遮断されることによって、前記複数のポンプ室の容積変化量を変化させる方向へ前記可動部材を制御する第2制御油室と、
前記吐出部からの作動液の吐出圧に応じて前記第2制御油室への油圧の給排を制御する制御機構と、
該制御機構と吐出部との間に形成される制御圧導入通路上に設けられ、吐出された作動液の前記制御機構側への導入を切り換え制御する切換機構と、
前記ポンプハウジングの対向する内側面に摺動する前記可動部材の両端面に形成され、前記吸入部側において前記各ポンプ室と前記第1制御油室との間をシールする第1シール部と、
前記ポンプハウジングの内側面に摺動する前記可動部材の両端面に形成され、前記吐出部側において前記各ポンプ室と第2制御油室との間をシールする第2シール部と、
を備え、
前記吐出部側における各ポンプ室から前記第2シール部を介して第2制御油室へリークする作動液のリーク量を、前記吸入部側における各ポンプ室から前記第1シール部を介して第1制御油室へリークする作動液のリーク量よりも少なくしたことを特徴とする可変容量形ポンプ。 - 請求項13に記載の可変容量形ポンプにおいて、
前記可動部材の第2シール部の径方向の幅長さを、前記第1シール部の径方向の幅長さよりも大きく形成したことを特徴とする可変容量形ポンプ。
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JP2018504058A JP6664465B2 (ja) | 2016-03-07 | 2017-02-06 | 可変容量形ポンプ |
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JP2012122389A (ja) * | 2010-12-08 | 2012-06-28 | Hitachi Automotive Systems Ltd | 可変容量型ベーンポンプ |
WO2014038302A1 (ja) * | 2012-09-07 | 2014-03-13 | 日立オートモティブシステムズ株式会社 | 可変容量形オイルポンプ及びこれを用いたオイル供給システム |
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JPH10205461A (ja) * | 1997-01-20 | 1998-08-04 | Nachi Fujikoshi Corp | 可変吐出量ベーンポンプ |
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JP6006098B2 (ja) | 2012-11-27 | 2016-10-12 | 日立オートモティブシステムズ株式会社 | 可変容量形ポンプ |
WO2014141013A1 (en) | 2013-03-13 | 2014-09-18 | Magna Powertrain Inc. | Vane pump with multiple control chambers |
JP6289943B2 (ja) * | 2014-03-10 | 2018-03-07 | 日立オートモティブシステムズ株式会社 | 可変容量形ポンプ |
JP2016104967A (ja) * | 2014-12-01 | 2016-06-09 | 日立オートモティブシステムズ株式会社 | 可変容量形オイルポンプ |
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JP2012122389A (ja) * | 2010-12-08 | 2012-06-28 | Hitachi Automotive Systems Ltd | 可変容量型ベーンポンプ |
WO2014038302A1 (ja) * | 2012-09-07 | 2014-03-13 | 日立オートモティブシステムズ株式会社 | 可変容量形オイルポンプ及びこれを用いたオイル供給システム |
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JP7324158B2 (ja) | 2020-02-07 | 2023-08-09 | 日立Astemo株式会社 | 可変容量形ポンプ |
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US20200032793A1 (en) | 2020-01-30 |
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EP3428450B1 (en) | 2023-12-27 |
EP3428450A1 (en) | 2019-01-16 |
CN108779772A (zh) | 2018-11-09 |
JP6664465B2 (ja) | 2020-03-13 |
CN108779772B (zh) | 2020-09-08 |
US11168684B2 (en) | 2021-11-09 |
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