US20170074263A1 - Vehicle hydraulic device - Google Patents

Vehicle hydraulic device Download PDF

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Publication number
US20170074263A1
US20170074263A1 US15/262,553 US201615262553A US2017074263A1 US 20170074263 A1 US20170074263 A1 US 20170074263A1 US 201615262553 A US201615262553 A US 201615262553A US 2017074263 A1 US2017074263 A1 US 2017074263A1
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US
United States
Prior art keywords
backpressure
working fluid
vane pump
oil pressure
pump
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US15/262,553
Other languages
English (en)
Inventor
Yoshihiro Mizuno
Shuji Moriyama
Yoshinobu Soga
Takafumi Inagaki
Hiromitsu Nitani
Mitsuhiro Takeda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aisin AW Co Ltd
Toyota Motor Corp
Original Assignee
Aisin AW Co Ltd
Toyota Motor Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Aisin AW Co Ltd, Toyota Motor Corp filed Critical Aisin AW Co Ltd
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, AISIN AW CO., LTD. reassignment TOYOTA JIDOSHA KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: INAGAKI, TAKAFUMI, MIZUNO, YOSHIHIRO, MORIYAMA, SHUJI, NITANI, HIROMITSU, SOGA, YOSHINOBU, TAKEDA, MITSUHIRO
Publication of US20170074263A1 publication Critical patent/US20170074263A1/en
Abandoned legal-status Critical Current

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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
    • F04C2/3446—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 more than one line or surface
    • 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
    • F04C14/24—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/08—Rotary pistons
    • F01C21/0809—Construction of vanes or vane holders
    • F01C21/0818—Vane tracking; control therefor
    • F01C21/0854—Vane tracking; control therefor by fluid means
    • F01C21/0863—Vane tracking; control therefor by fluid means the fluid being the working fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
    • F04C15/008—Prime movers
    • 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
    • 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
    • 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
    • F04C2/3448—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 with axially movable vanes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/20—Rotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/30—Casings or housings
    • 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
    • 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
    • F04C2270/70—Safety, emergency conditions or requirements
    • F04C2270/701—Cold start

Definitions

  • the present disclosure relates to a vehicle hydraulic device having a vane pump as the oil pressure source, and more particularly to a technique for enhancing the durability of a valve that applies a backpressure to vanes.
  • a vane pump driven by an engine has, inside a pump housing with a substantially elliptical inner peripheral cam surface, for example, a plurality of variable-displacement pump chambers that are defined by a rotor fitted on a rotating shaft and a plurality of vanes radially fitted into vane housing groves formed in the rotor. As the vanes rotate while being pressed against the inner peripheral surface of the pump housing, the volumes of the pump chambers vary and a discharge force is applied to a working fluid.
  • the force for pressing the vanes against the inner peripheral surface of the pump housing is derived from a rotational centrifugal force and a backpressure that presses the vanes against the inner peripheral surface of the pump housing inside the rotor, and the working fluid discharged from the vane pump is used to obtain this backpressure.
  • the rotation speed of the rotor is low at the start of the vane pump, even when the centrifugal force of the rotating vanes and the backpressure generated by the working fluid discharged from the vane pump are combined, the force that presses the vanes against the inner peripheral surface of the pump housing may be too small for the pump to start smoothly.
  • Japanese Patent Application Publication No. 10-196557 discloses a technique for preventing the backpressure inside a vane pump from decreasing while the vane pump is stopped.
  • vane housing grooves provided inside the rotor and a discharge oil passage that supplies a working fluid discharged from the vane pump to an oil pressure control device communicate with each other through a backpressure oil passage.
  • a check valve that opens only when the pressure on the vane pump side is equal to or higher than a predetermined value is provided on the downstream side from the communication point, i.e., on the side of an oil pressure control circuit that receives and consumes a supply of oil pressure from the vane pump.
  • the present disclosure provides a vehicle hydraulic device including a vane pump, in which a check valve is provided to allow the vane pump to operate smoothly even at the start and the durability of the check valve is improved.
  • a vehicle hydraulic device including a vane pump, an oil pressure control circuit and a check valve.
  • the vane pump is driven to rotate by an engine.
  • the vane pump includes a pump housing, a plurality of vanes, and a rotor.
  • the pump housing has an inner peripheral cam surface with an elliptical sectional shape.
  • the plurality of vanes are provided inside the pump housing.
  • the rotor provides vane housing grooves that house the plurality of vanes so as to be movable in a radial direction of the rotor.
  • the oil pressure control circuit has a backpressure oil passage and a discharge oil passage. The backpressure oil passage is configured to supply a backpressure to the plurality of vanes inside the vane housing grooves.
  • the discharge oil passage is configured to: (i) introduce a working fluid discharged from the vane pump, and (ii) supply the working fluid to a device other than the vehicle hydraulic device.
  • the check valve is provided between the backpressure oil passage and the discharge oil passage. The check valve is configured to: (i) open when the oil pressure of the working fluid in the discharge oil passage discharged from the vane pump is higher than the oil pressure in the backpressure oil passage, and (ii) block the flow of the working fluid when the oil pressure of the working fluid in the discharge oil passage discharged from the vane pump is equal to or lower than the oil pressure in the backpressure oil passage.
  • a vehicle hydraulic device including a vane pump and an oil pressure control circuit.
  • the vane pump is driven to rotate by an engine.
  • the vane pump includes a pump housing, a plurality of vanes, a rotor, and a check valve.
  • the pump housing has an inner peripheral cam surface with an elliptical sectional shape.
  • the plurality of vanes are provided inside the pump housing.
  • the rotor provides vane housing grooves that house the plurality of vanes so as to be movable in a radial direction of the rotor.
  • the check valve is configured to open to allow the flow of a working fluid and close to shut off the flow of the working fluid.
  • the oil pressure control circuit has a backpressure oil passage, a discharge oil passage, and a check valve.
  • the backpressure oil passage is configured to supply a backpressure to the plurality of vanes inside the vane housing grooves.
  • the discharge oil passage is configured to introduce the working fluid discharged from the vane pump and supply the working fluid to a device other than the vehicle hydraulic device through the discharge oil passage.
  • the check valve is interposed between the backpressure oil passage and the discharge oil passage.
  • the check valve is configured to: (i) open when the oil pressure of the working fluid in the discharge oil passage discharged from the vane pump is higher than the oil pressure in the backpressure oil passage, and (ii) block the flow of the working fluid when the oil pressure of the working fluid in the discharge oil passage discharged from the vane pump is equal to or lower than the oil pressure in the backpressure oil passage.
  • the check valve opens at the point in time when the oil pressure control circuit, to which the working fluid is supplied from the vane pump, has been filled with the working fluid and the oil pressure in the discharge oil passage communicating with the oil pressure control circuit has risen and exceeded the oil pressure in the backpressure oil passage.
  • the check valve is prevented from opening and closing repeatedly, so that the durability of the check valve is improved.
  • the present disclosure provides a vehicle hydraulic device including a vane pump, in which a check valve is provided to allow the vane pump to operate smoothly even at the start and the durability of the check valve is improved.
  • a vehicle hydraulic device including a vane pump and an oil pressure control circuit, the vehicle hydraulic device further including a check valve.
  • the vane pump is driven to rotate by an engine.
  • the vane pump includes a pump housing, a plurality of vanes, and a rotor.
  • the pump housing has an inner peripheral cam surface with an elliptical sectional shape.
  • the plurality of vanes are provided inside the pump housing.
  • the rotor provides vane housing grooves that house the plurality of vanes so as to be movable in a radial direction of the rotor.
  • the oil pressure control circuit has a backpressure oil passage and a discharge oil passage.
  • the backpressure oil passage is configured to supply a backpressure to the plurality of vanes inside the vane housing grooves.
  • the discharge oil passage is configured to: (i) introduce a working fluid discharged from the vane pump, and (ii) supply the working fluid to a device other than the vehicle hydraulic device.
  • the check valve is provided between the backpressure oil passage and the discharge oil passage. The check valve is configured to: (i) open when the oil pressure of the working fluid in the discharge oil passage discharged from the vane pump is higher than the oil pressure in the backpressure oil passage, and (ii) block the flow of the working fluid when the oil pressure of the working fluid in the discharge oil passage discharged from the vane pump is equal to or lower than the oil pressure in the backpressure oil passage.
  • a vehicle hydraulic device including a vane pump and an oil pressure control circuit.
  • the vane pump is driven to rotate by an engine.
  • the vane pump includes a pump housing, a plurality of vanes, a rotor, and a check valve.
  • the pump housing has an inner peripheral cam surface with an elliptical sectional shape.
  • the plurality of vanes are provided inside the pump housing.
  • the rotor provides vane housing grooves that house the plurality of vanes so as to be movable in a radial direction of the rotor.
  • the check valve is configured to open to allow the flow of a working fluid and close to shut off the flow of the working fluid.
  • the oil pressure control circuit has a backpressure oil passage, a discharge oil passage, and a check valve.
  • the backpressure oil passage is configured to supply a backpressure to the plurality of vanes inside the vane housing grooves.
  • the discharge oil passage is configured to: (i) introduce the working fluid discharged from the vane pump, and (ii) supply the working fluid to a device other than the vehicle hydraulic device through the discharge oil passage.
  • the check valve is interposed between the backpressure oil passage and the discharge oil passage.
  • the check valve is configured to: (i) open when the oil pressure of the working fluid in the discharge oil passage discharged from the vane pump is higher than the oil pressure in the backpressure oil passage, and (ii) block the flow of the working fluid when the oil pressure of the working fluid in the discharge oil passage discharged from the vane pump is equal to or lower than the oil pressure in the backpressure oil passage.
  • the check valve opens at the point in time when the oil pressure control circuit, to which the working fluid is supplied from the vane pump, has been filled with the working fluid and the oil pressure in the discharge oil passage communicating with the oil pressure control circuit has risen and exceeded the oil pressure in the backpressure oil passage.
  • the check valve is prevented from opening and closing repeatedly, so that the durability of the check valve is improved.
  • FIG. 1 is a schematic view illustrating the configuration of the major part of a vehicle hydraulic device of a first embodiment
  • FIG. 2 is a front view of a vane pump of the vehicle hydraulic device of FIG. 1 , with a cover thereof removed;
  • FIG. 3 is a sectional view of the major part inside a recess of a vane pump of a second embodiment
  • FIG. 4 is a front view of a cover of FIG. 3 ;
  • FIG. 5 is a front view of a first side plate of FIG. 3 ;
  • FIG. 6 is a rear view of the first side plate of FIG. 3 ;
  • FIG. 7 is a front view of a second side plate of FIG. 3 ;
  • FIG. 8 is a rear view of the second side plate of FIG. 3 ;
  • FIG. 9 is a rear view of a third side plate of FIG. 3 ;
  • FIG. 10 is a front view of a body of FIG. 3 ;
  • FIG. 11 is a sectional view of the major part of the second embodiment showing the second side plate, in which a first check valve is incorporated, the third side plate, and the body;
  • FIG. 12A is a front view of a retainer, constituting a part of the first check valve of FIG. 11 , as seen from the side of the body;
  • FIG. 12B is a front view of a leaf spring, constituting a part of the first check valve of FIG. 11 , as seen from the side of the body;
  • FIG. 12C is a front view of a sheet, constituting a part of the first check valve of FIG. 11 , as seen from the side of the body.
  • FIG. 1 is a schematic view illustrating the configuration of the vehicle hydraulic device.
  • a vehicle hydraulic device 10 includes a check valve 90 , and a vane pump 14 that supplies a working fluid to an oil pressure control device 12 functioning as an oil pressure control circuit that consumes the working fluid, such as the hydraulic cylinder of the sheave etc. of an automatic transmission (A/T) or a continuously variable transmission (CVT).
  • A/T automatic transmission
  • CVT continuously variable transmission
  • the vane pump 14 is driven by the rotation of an engine 15 .
  • the vane pump 14 has a first suction port 22 and a second suction port 24 through which the working fluid stored in an oil pan 18 is suctioned via an oil strainer 20 , and a first discharge port 26 and a second discharge port 28 through which the suctioned working fluid is discharged to the outside of the pump.
  • the vane pump 14 further has a first backpressure groove 62 and a second backpressure groove 64 that supply a backpressure to a plurality of vanes 81 that suction and discharge the working fluid.
  • the working fluid is sent from the suction ports 22 , 24 to the discharge ports 26 , 28 through pump chambers P formed by the vanes 81 .
  • a first discharge oil passage 30 and a second discharge oil passage 31 are connected to the first discharge port 26 and the second discharge port 28 , respectively.
  • the first discharge oil passage 30 and the second discharge oil passage 31 are further connected to a discharge oil passage 29 , and serve as working fluid supply passages to the oil pressure control device 12 through which the working fluid discharged from the first discharge port 26 and the second discharge port 28 is pumped to the oil pressure control device 12 .
  • a first backpressure oil passage 35 and a second backpressure oil passage 36 are connected to the first backpressure groove 62 and the second backpressure groove 64 , respectively.
  • a check valve 90 is provided between the first and second discharge oil passages 30 , 31 and the first and second backpressure oil passages 35 , 36 .
  • a suction oil passage 34 connects the first and second suction ports 22 , 24 of the vane pump 14 and the oil pan 18 to each other via the oil strainer 20 such that the working fluid stored in the oil pan 18 is suctioned into the first suction port 22 and the second suction port 24 .
  • a return oil passage 32 returns the working fluid of the oil pressure control device 12 to the suction oil passage 34 of the vane pump 14 .
  • FIG. 2 is a front view showing the vane pump 14 of the vehicle hydraulic device 10 with a pump cover removed.
  • the vane pump 14 is composed of: a body 44 having a substantially columnar recess 16 formed therein; a substantially cylindrical cam ring 70 , corresponding to a pump housing, that is fitted inside the recess 16 so as to be unable to rotate relative to the body 44 ; a disc-shaped side plate 37 that is mounted so as to be interposed between a bottom wall surface of the recess 16 of the body 44 and the cam ring 70 , with one flat surface and the other flat surface of the side plate 37 respectively in contact with the bottom wall surface of the recess 16 and a substantially circular one end surface of the cam ring 70 ; a columnar rotor 74 housed such that the outer peripheral surface faces an inner peripheral cam surface 78 of the cam ring 70 with a small space therebetween, and that one end surface in the direction of a rotational axis can come into sliding contact with the other flat surface of the side plate 37
  • the cam ring 70 has the inner peripheral cam surface 78 that is the inner peripheral surface with a substantially elliptical sectional shape.
  • the rotor 74 includes a plurality of slits 80 , corresponding to the vane housing grooves, that are formed over the entire axial length of the outer peripheral surface, radially from a center part in the radial direction toward the outer peripheral surface at regular intervals in the circumferential direction, and the plurality of rectangular, plate-shaped vanes 81 that are fitted into the slits 80 . Since the slits 80 house the vanes, the slits 80 are also called vane housing grooves.
  • the vane 81 is inserted into the slit 80 such that the side surfaces of the vane 81 in the circumferential direction of the rotor 74 can slide in the radial direction of the rotor 74 over an inner wall of the slit 80 facing the vane 81 ; that the side surfaces in the axial direction come into sliding contact with the other end surface of the side plate 37 and an inner wall surface of the pump cover, respectively; and that the radially outer end surface of the vane 81 can slide over the inner peripheral cam surface 78 of the cam ring 70 .
  • the vane 81 When the rotor 74 is driven to rotate, the vane 81 is pushed out toward the radially outer side of the rotor 74 from the inner wall of the slit 80 under the backpressure from the first backpressure groove 62 and the second backpressure groove 64 , so that the radially outer end surface of the vane 81 is pressed against the inner peripheral cam surface 78 of the cam ring 70 and, in this state, slides over the inner peripheral cam surface 78 in the rotation direction of the rotor 74 .
  • the plurality of pump chambers P are defined by the side surfaces of the adjacent vanes 81 facing each other in the circumferential direction, the inner peripheral cam surface 78 , the outer peripheral surface of the rotor 74 , the other end surface of the side plate 37 , and the inner wall surface of the pump cover. Since the inner peripheral cam surface 78 has a substantially elliptical shape, as the rotor 74 makes one rotation, the vane 81 reciprocates twice inside the slit 80 in the radial direction of the rotor 74 , so that the volume of the pump chamber P increases and decreases twice.
  • the pair of first discharge port 26 and second discharge port 28 communicating with the pump chambers P, which decrease in volume according to the rotation of the rotor 74 are formed across the pump shaft 76 so as to straddle both the side plate 37 and the body 44 .
  • the first discharge port 26 is located on the front side in the rotation direction of the rotor 74 relative to the first suction port 22 .
  • the second discharge port 28 is located on the front side in the rotation direction of the rotor 74 relative to the second suction port 24 . It is also possible to form the ports 22 , 24 , 26 , 28 only in the side plate 37 , instead of forming these ports so as to straddle both the side plate 37 and the body 44 .
  • the side plate 37 communicates with the inner peripheral ends of the slits 80 , into which the vanes 81 defining the pump chambers P are fitted, between the first suction port 22 and the first discharge port 26 .
  • the first backpressure groove 62 and the second backpressure groove 64 that supply a backpressure for pressing the vanes 81 against the inner peripheral cam surface 78 are formed in a semi-annular shape in the circumferential direction of the side plate 37 .
  • the first backpressure groove 62 and the second backpressure groove 64 communicate with the first backpressure oil passage 35 and the second backpressure oil passage 36 , respectively.
  • the oil pressure in the first backpressure oil passage 35 and the second backpressure oil passage 36 is supplied as a backpressure for pressing the radially outer end surfaces of the vanes 81 defining the pump chambers P against the inner peripheral cam surface 78 of the cam ring 70 .
  • the check valve 90 is provided in the oil passage that connects the first and second backpressure oil passages 35 , 36 and the first and second discharge oil passages 30 , 31 to each other.
  • the check valve 90 opens when the oil pressure of the working fluid in the discharge oil passages 30 , 31 discharged from the vane pump 14 is higher than the oil pressure in the backpressure oil passages 35 , 36 , and the check valve 90 closes and blocks the flow of the working fluid when the oil pressure of the working fluid in the discharge oil passages 30 , 31 discharged from the vane pump 14 is equal to or lower than the oil pressure in the backpressure oil passages 35 , 36 . In this way, the backpressure for pressing the radially outer end surfaces of the vanes 81 defining the pump chambers P of the vane pump 14 against the inner peripheral cam surface 78 of the cam ring 70 is maintained.
  • the check valve 90 is provided in the vehicle hydraulic device 10 of the first embodiment, which makes it possible to operate the vane pump 14 smoothly even at the start of the vane pump 14 by maintaining the oil pressure in the backpressure oil passages 35 , 36 connected to the vane pump while the vane pump 14 is stopped.
  • the check valve 90 opens when the oil pressure of the working fluid in the discharge oil passages 30 , 31 discharged from the vane pump 14 is higher than the oil pressure in the backpressure oil passages 35 , 36 , and the check valve 90 closes and shuts off the flow of the working fluid when the oil pressure of the working fluid in the discharge oil passages 30 , 31 discharged from the vane pump is equal to or lower than the oil pressure in the backpressure oil passages 35 , 36 .
  • the check valve 90 With such a check valve 90 provided between the backpressure oil passages 35 , 36 and the discharge oil passages 30 , 31 , the oil pressure control device 12 , to which the working fluid is supplied from the vane pump 14 , is filled with the working fluid. Then, the check valve 90 opens at the point in time when the oil pressure in the discharge oil passages 30 , 31 communicating with the oil pressure control device 12 has risen and exceeded the oil pressure in the backpressure oil passages. Thus, the check valve 90 is prevented from opening and closing repeatedly, so that the durability of the check valve 90 is improved.
  • the check valve 90 is provided in the backpressure oil passages 35 , 36 to which the working fluid is supplied at a lower flow rate, so that especially the torque loss of the vane pump 14 can be reduced during high-speed rotation of the vane pump 14 compared with when the check valve 90 is provided in the discharge oil passage 29 to which the working fluid is supplied at a higher flow rate.
  • the vehicle hydraulic device 10 of the second embodiment is different from that of the first embodiment in that the check valve 90 is built inside a second side plate 40 , and that a plurality of side plates, a first side plate 38 , the second side plate 40 , and a third side plate 42 having oil passages accompanying the check valve, are used. Therefore, only such differences in configuration will be described in detail using FIG. 3 to FIG. 11 .
  • FIG. 3 is a sectional view of the vane pump 14 .
  • the body 44 is provided with a first discharge opening 54 and a second discharge opening 56 communicating with the inside of the recess 16 .
  • the third side plate 42 and the second side plate 40 are fitted inside the recess 16 of the body 44 so as to be unable to rotate relative to the body 44 .
  • the cam ring 70 is fitted so as to be unable to rotate relative to the body 44 , and the rotor 74 radially housing the plurality of vanes 81 inside is installed inside the recess 16 of the body 44 .
  • the first side plate 38 is fitted inside the recess 16 of the body 44 so as to be unable to rotate relative to the body 44 .
  • a cover 72 is mounted so as to cover the opening of the recess 16 of the body 44 , and the cover 72 is provided with a first suction opening 46 , a second suction opening 48 , and a pump shaft insert hole 77 through which the pump shaft 76 is passed.
  • FIG. 4 is a front view of the cover 72 .
  • the cover is provided with the first suction opening 46 and the second suction opening 48 connected to the suction oil passage 34 , and the pump shaft insert hole 77 at the center of the cover. Since the pump shaft insert hole 77 is also provided in each of the first side plate 38 , the second side plate 40 , the third side plate 42 , and the body 44 , the description of the pump shaft insert hole 77 will be omitted from the subsequent description.
  • FIG. 5 is a front view of the first side plate 38 as seen from the side of the cover 72 .
  • the first side plate 38 has a first suction opening 46 a connected to the first suction opening 46 and a second suction opening 48 a connected to the second suction opening 48 .
  • FIG. 6 is a rear view of the first side plate 38 .
  • a first backpressure groove 63 a and a second backpressure groove 65 a are formed in a semi-annular shape in the circumferential direction around the pump shaft insert hole 77 .
  • the first backpressure groove 63 a and the second backpressure groove 65 a supply a backpressure to be applied to the vanes 81 .
  • FIG. 7 is a front view of the second side plate 40 as seen from the side of the cover 72 .
  • the second side plate 40 has a first backpressure groove 63 b and a second backpressure groove 65 b, each functioning as the backpressure oil passage, formed as semi-annular grooves in the circumferential direction around the pump shaft insert hole 77 .
  • the backpressure grooves 63 b, 65 b supply a backpressure to be applied to the vanes 81 .
  • the openings of the first backpressure groove 63 b and a first bypass passage 82 b of FIG. 8 functioning as the backpressure oil passage partially overlap and communicate with each other, while the openings of the second backpressure groove 65 b and a second bypass passage 84 b of FIG.
  • the first discharge groove 50 b is open in the same shape and at the same position as a first discharge groove 50 c of the third side plate 42 of FIG. 9 , and communicates with the first discharge opening 54 of the body, while the second discharge groove 52 b is open in the same shape and at the same position as a second discharge groove 52 c of the third side plate 42 of FIG. 9 , and communicates with the second discharge opening 56 of the body. Since the first discharge grooves and the second discharge grooves carry the working fluid from the pump chambers P, these grooves correspond to the first discharge port 26 and the second discharge port 28 of the first embodiment.
  • a first suction groove 58 and a second suction groove 60 are formed at positions corresponding to the first suction opening 46 a and the second suction opening 48 a that are provided in the first side plate 38 across the rotor 74 , and since the first suction groove 58 and the second suction groove 60 have a wide opening, the amount of working fluid required for the pump chambers P defined by the vanes 81 is supplied.
  • FIG. 8 is a rear view of the second side plate 40 .
  • the first discharge groove 50 b and the second discharge groove 52 b are fully open, and the first bypass passage 82 b holding the first check valve 98 and the second bypass passage 84 b holding the second check valve 99 are provided.
  • the first bypass passage 82 b and the second bypass passage 84 b of FIG. 8 are partially open, these bypass passages partially communicate with the first backpressure groove 63 b and the second backpressure groove 65 b, respectively.
  • FIG. 9 is a rear view of the third side plate 42 .
  • the first discharge groove 50 c and the second discharge groove 52 c are fully open, and a first bypass passage 82 c and a second bypass passage 84 c are formed.
  • the first bypass passage 82 c and the second bypass passage 84 c are each formed of two semi-circular through-grooves.
  • FIG. 10 is a front view of the body. With the circular recess 16 open at the end formed in an outer center part of the body 44 , the body 44 has a one-end-closed cylindrical shape.
  • the first discharge opening 54 connected to the first discharge oil passage 30 is formed so as to penetrate the bottom wall of the body 44 .
  • the second discharge opening 56 connected to the second discharge oil passage 31 is formed so as to penetrate the bottom wall of the body 44 .
  • the bottom wall further has a first bypass groove 86 formed of an annular groove formed at a position corresponding to the first bypass passage 82 b of the second side plate 40 and a groove providing communication between that annular groove and the first discharge opening 54 .
  • the bottom wall has a second bypass groove 88 formed of an annular groove formed at a position corresponding to the second bypass passage 84 b of the second side plate 40 and a groove providing communication between that annular groove and the second discharge opening 56 .
  • FIG. 11 is a sectional view of the major part showing the second side plate 40 , in which one of the first check valve 98 and the second check valve 99 is incorporated, the third side plate 42 , and the body 44 .
  • the first check valve 98 and the second check valve 99 are held respectively inside the first bypass passage 82 b and the second bypass passage 84 b of the second side plate 40 , and similarly composed of three members, a retainer 92 , a leaf spring 94 , and a sheet 96 .
  • the first check valve 98 will be described as a representative while the description of the second check valve 99 will be omitted.
  • FIGS. 12A, 12B, 12C are front views of the retainer 92 , the leaf spring 94 , and the sheet 96 , constituting the first check valve 98 , as seen from the side of the body 44 .
  • the retainer 92 and the leaf spring 94 have a ring shape.
  • the sheet 96 has a disc shape with a circular opening at the center.
  • the retainer 92 holds the leaf spring 94 inside the first bypass passage 82 b and the second bypass passage 84 b.
  • the leaf spring 94 applies a force for pressing the sheet 96 against a columnar part provided at the center of the bypass passage 82 c of the third side plate 42 .
  • the sheet 96 constituting a part of the first check valve 98 has one side surface in contact with the working fluid on the discharge opening side and the other side surface in contact with the working fluid on the backpressure groove side.
  • the oil passage opens when the oil pressure of the working fluid at the first discharge opening 54 discharged from the vane pump 14 is higher than the oil pressure in the backpressure grooves of the rotor 74 , the first side plate 38 and the second side plate 40 , and the oil passage closes and the flow of the working fluid is blocked when the oil pressure is equal to or lower than the oil pressure in the backpressure grooves.
  • the backpressure for pressing the radially outer end surfaces of the vanes 81 defining the pump chambers P of the vane pump 14 against the inner peripheral cam surface 78 of the cam ring 70 is maintained.
  • the vehicle hydraulic device 10 of the second embodiment is provided with the first check valve 98 and the second check valve 99 , which makes it possible to operate the vane pump 14 smoothly even at the start of the vane pump 14 by maintaining the oil pressure in the first backpressure groove 62 and the second backpressure groove 64 inside the rotor 74 of the vane pump while the vane pump 14 is stopped.
  • the first check valve 98 and the second check valve 99 open at the point in time when the oil pressure control device 12 , to which the working fluid is supplied from the vane pump 14 by the first check valve 98 and the second check valve 99 , has been filled with the working fluid and the oil pressure in the discharge oil passages 30 , 31 communicating with the oil pressure control device 12 has risen and exceeded the oil pressure in the backpressure oil passages 35 , 36 .
  • the first check valve 98 and the second check valve 99 are prevented from opening and closing repeatedly, so that the durability of the first check valve 98 and the second check valve 99 is improved.
  • first check valve 98 and the second check valve 99 are provided in the first bypass passage 82 b and the second bypass passage 84 b to which the working fluid is supplied at a lower flow rate, especially the torque loss of the vane pump 14 during high-speed rotation of the vane pump 14 can be reduced compared with when the check valve 90 is provided in the discharge oil passage 29 to which the working fluid is supplied at a higher flow rate.
  • the cam ring 70 having the inner peripheral cam surface 78 is fitted in the recess 16 of the body 44 .
  • the present embodiments are not limited thereto, and, for example, the cam ring may be omitted by forming the inner peripheral cam surface 78 , facing the outer peripheral surface of the rotor 74 , directly on the inner peripheral surface of the recess 16 of the body 44 .
  • the vane pump of the second embodiment is provided with the two check valves 98 , 99 , the present embodiments are not limited thereto and the number of the check valves may be one or more than two.
  • the vane pump of the second embodiment has been described with three types of side plates, but the present embodiment is not limited thereto.
  • the number of the side plates may be increased to make the machining of the oil passage easier.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
US15/262,553 2015-09-14 2016-09-12 Vehicle hydraulic device Abandoned US20170074263A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015-181241 2015-09-14
JP2015181241A JP2017057737A (ja) 2015-09-14 2015-09-14 車両用油圧装置

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US20170074263A1 true US20170074263A1 (en) 2017-03-16

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US15/262,553 Abandoned US20170074263A1 (en) 2015-09-14 2016-09-12 Vehicle hydraulic device

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JP (1) JP2017057737A (de)
CN (1) CN106968946A (de)
DE (1) DE102016116756A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023217606A1 (en) * 2022-05-09 2023-11-16 City, University of London Rotating screw machine with discharge plate

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113323875B (zh) * 2021-05-20 2022-08-02 重庆建设车用空调器有限责任公司 旋转型气体压缩机

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US4744732A (en) * 1985-12-28 1988-05-17 Diesel Kiki Co., Ltd. Variable capacity vane compressor
US20140301877A1 (en) * 2011-11-04 2014-10-09 Christian Böhm Pump device for delivering a medium

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US3481276A (en) * 1967-11-27 1969-12-02 Abex Corp Vane tracking in hydraulic pumps
JPS62153587A (ja) * 1985-12-27 1987-07-08 Nissan Motor Co Ltd ロ−タリ式エアコンコンプレツサ
JP3759659B2 (ja) 1997-01-08 2006-03-29 株式会社ショーワ ベーンポンプ
JP4185722B2 (ja) * 2002-07-17 2008-11-26 カルソニックコンプレッサー株式会社 気体圧縮機
JP4759474B2 (ja) * 2006-08-30 2011-08-31 日立オートモティブシステムズ株式会社 ベーンポンプ
JP2013087751A (ja) * 2011-10-21 2013-05-13 Kyb Co Ltd ベーンポンプ

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Publication number Priority date Publication date Assignee Title
US4744732A (en) * 1985-12-28 1988-05-17 Diesel Kiki Co., Ltd. Variable capacity vane compressor
US20140301877A1 (en) * 2011-11-04 2014-10-09 Christian Böhm Pump device for delivering a medium

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023217606A1 (en) * 2022-05-09 2023-11-16 City, University of London Rotating screw machine with discharge plate

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CN106968946A (zh) 2017-07-21
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