JP2018115571A - Multistep type variable displacement oil pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide in particular a multistep type variable displacement oil pump capable of selecting in multistep an amount of emission of engine oil.SOLUTION: A multistep type variable displacement oil pump of this invention comprises a pump housing in which a compression member and an adjusting valve are mounted, the compression member is rotated by variation in hydraulic pressure at an outflow region at the pump housing and it is possible to pressurize oil in the outflow region to flow in reverse direction in an inflow region and additionally the pump housing is formed with a guide flow passage, a communication hole and a reverse flow hole and the like to move the adjusting valve, there is provided the adjusting valve, so that when the adjusting valve drives the compression member, it is possible to adjust the hydraulic pressure and further motion of the adjusting valve in response to an actual application state enables oil in the in-flow region and out-flow region to be adjusted by the reversing means.SELECTED DRAWING: Figure 1

Description

  The present invention particularly relates to an engine oil pump that can select engine oil discharge in multiple stages.

  The engine oil pump is a liquid feeding device for pumping the lubricating oil, and is usually used to send the lubricating oil to the inside of the working member, for example, for lubricating or cooling the turbine bearing, or Used for lubrication or cleaning of pistons and cylinders of reciprocating machines.

  As an existing oil pump, for example, there is a “oil pump with adjustable flow rate” disclosed in Taiwan Patent No. I103133153. The structure includes a first pump housing and a second pump housing which are connected to each other, and a control valve unit and a pressurizing unit are installed inside the second pump housing, and an eccentric wheel of the pressurizing unit is a control valve unit. Since the plug portion of the control valve unit drives and rotates the eccentric wheel, thereby controlling the amount of oil flowing out, the transmission member for adjusting the flow rate can be reduced. At the same time, the production cost can be reduced and the assembly work can be saved, and the transmission efficiency between the control valve unit and the pressurizing unit can be improved.

Taiwan Patent No. I103133153

  However, since the existing oil pump unifies the technical means for adjusting the flow rate and cannot be adjusted to an appropriate hydraulic pressure or outflow amount according to actual demand, it has been necessary to improve it.

  A multi-stage variable displacement oil pump according to the present invention includes a pump housing, a pressurizing member, a regulating valve, and a drive valve. One of the pump housings has an inlet, an outflow passage, and an inflow An area, an outflow area, a guide flow path, a first series flow path, a first chamber, a plurality of backflow holes, and a plurality of communication holes are formed. The pump housing is formed to communicate with the interior of the pump housing, the inflow area is formed in the pump housing so as to correspond to the inflow port, and the outflow area corresponds to the outflow passage. The guide channel and the first communication channel are spaced apart from each other and communicate with each other through a plurality of communication holes, and the first communication channel is connected to the first chamber. While communicating, Pong Concave inside the housing, the first chamber communicates with the inflow area through a plurality of backflow holes, and the other part of the pump housing communicates with a receiving portion, a second communication channel, and a second chamber. An opening is formed, wherein the second communication flow path communicates with the housing portion and communicates with the second chamber, and the second chamber communicates with the housing portion through the communication opening, and the pressure member Is rotatably disposed inside the pump housing and is arranged to correspond to the second chamber and the communication opening, and the adjustment valve is movable to seal the first communication passage. An annular recess is formed in the outer peripheral surface of the chamber corresponding to the plurality of backflow holes and the plurality of communication holes, and the drive valve is movable so as to seal the second communication channel. pump Fitted into the second chamber of Ujingu are those combined pressure member via the communication opening.

According to the multistage variable displacement oil pump of the present invention, the oil flow path is constituted by the guide flow path of the pump housing, the two backflow holes, the two communication holes, and the adjustment valve and the drive valve are installed. Therefore, if the pressurizing member is driven by the drive valve, the outlet hydraulic pressure and the outlet outlet outflow amount in the first-stage hydraulic pressure and outflow amount changing area can be adjusted.
Also, depending on the actual oil requirement, the operation performance curve is changed to different states such as the second stage hydraulic pressure and spill amount change area, the outlet spill amount increase area, the third stage hydraulic pressure and spill amount change area. Partition. Since the regulating valve moves by changing the outlet hydraulic pressure and the outlet outlet flow amount in the outflow area, the oil in the outflow area and the inflow area can be adjusted by the backflow means. Therefore, the multistage variable displacement oil pump according to the present invention can adjust the outlet hydraulic pressure and the outlet outlet flow amount in multiple stages according to actual demand.

It is a perspective view of the present invention. It is a partial exploded perspective view of the present invention. It is another partial exploded perspective view of the present invention. It is a bottom view of the present invention. It is sectional drawing of the AA line of FIG. It is sectional drawing of the BB line of FIG. It is sectional drawing of CC line of FIG. It is sectional drawing of the state which act | operated the multistage variable displacement oil pump of FIG. FIG. 6 is a cross-sectional view of a state in which the multistage variable displacement oil pump of FIG. It is sectional drawing of the state which act | operated the multistage type variable displacement oil pump of FIG. FIG. 10 is a cross-sectional view of a state in which the multistage variable displacement oil pump of FIG. It is sectional drawing of the state which act | operated the multistage variable displacement oil pump of FIG. 10 for expressing the increase state of the outflow amount of an outflow port. FIG. 12 is a cross-sectional view of a state in which the multi-stage variable displacement oil pump of FIG. FIG. 13 is a cross-sectional view of a state in which the multi-stage variable displacement oil pump of FIG. 4 is an operation performance graph showing changes in hydraulic pressure, outflow amount and rotational speed in the multistage variable displacement oil pump according to the present invention.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1, 2, and 4, the multistage variable displacement oil pump according to the present invention includes a pump housing 10, a pressurizing member 20, a regulating valve 30, and a drive valve 40.
As shown in FIGS. 3, 5, and 6, the pump housing 10 includes a first shell portion 11 and a second shell portion 12, and an inflow area 103 and an outflow area 104 are provided inside the pump housing 10. It is formed.

  The first shell portion 11 includes an inflow port 101, an inflow tank 111, an outflow tank 112, a guide flow channel 113, a first series flow channel 114, a first chamber 115, and a first stepped portion 116. , A reverse flow path 117, two backflow holes 118, and two communication holes 119 are provided. Of these, the inflow port 101 is formed in the first shell portion 11, the inflow tank 111 communicates with the inflow port 101 and is recessed in the first shell portion 11, and the outflow tank 112 is connected to the inflow tank 111. The guide channel 113 communicates with the outflow tank 112 and is recessed in the first shell 11, and the first series flow channel 114 is outflowed. The first chamber 115 communicates with the tank 112 and is recessed in the first shell 11, and the first chamber 115 communicates with the first series passage 114 and is recessed in the first shell 11. The one stepped portion 116 is formed at a position where the first series flow passage 114 and the first chamber 115 are in contact with each other, and the reverse flow passage 117 communicates with the inflow tank 111 and is recessed in the first shell portion 11. The two backflow holes 118 are respectively connected to the inflow tank 111 and In order to communicate with one chamber 115, the first shell portion 11 is formed to communicate with the reverse flow path 117 at an interval, and the first chamber 115 communicates with the inflow area 103 through the backflow hole 118. The two communication holes 119 are formed between the guide flow channel 113 and the first continuous flow channel 114 in order to communicate the guide flow channel 113 and the first continuous flow channel 114 with a space therebetween. Are arranged so as to correspond to the backflow holes 118, respectively.

2, 6, and 7, the second shell 12 is detachably combined with the first shell 11, and the second shell 12 is fastened by a plurality of screws. It is preferable to be combined with the single shell portion 11. The second shell portion 12 includes an outflow channel 102, a storage unit 121, a second communication channel 122, a second chamber 123, a second stepped portion 124, and a communication opening 125, of which The outflow channel 102 is formed in the second shell portion 12, and the accommodating portion 121 is provided with an outflow portion 120 that is recessed in the second shell portion 12 and communicates with the outflow channel 102.
As shown in FIGS. 2 and 3, the accommodating portion 121 is formed to face the inflow tank 111 and the outflow tank 112 of the first shell portion 11, and a corresponding portion between the accommodating portion 121 and the inflow tank 111 is formed. An inflow area 103 is formed, and the inflow area 103 is formed so as to correspond to the inflow port 101. Further, corresponding portions of the outflow part 120 and the outflow tank 112 constitute an outflow area 104, and the outflow area 104 is formed to communicate with the outflow channel 102.

  The second communication channel 122 communicates with the accommodating portion 121 and the outflow portion 120, and is recessed in the second shell portion 12. The second chamber 123 communicates with the second communication channel 122, and The second stepped portion 124 is formed at a location where the second communication channel 122 and the second chamber 123 are in contact with each other, and the communication opening 125 is formed between the second chamber 123 and the accommodating portion 121. Are formed in the second shell 12 so as to communicate with each other.

As shown in FIGS. 2 and 7, the pressurizing member 20 is rotatably installed in the accommodating portion 121 of the pump housing 10, and is arranged so as to correspond to the second chamber 123 and the communication opening 125, and the eccentric ring 21. And an outer rotor 22 and an inner rotor 23.
The eccentric ring 21 is a hollow ring, and its inner peripheral edge is hollow and provided at an eccentric position. The eccentric ring 21 is rotatably fitted in the accommodating portion 121 of the pump housing 10 and corresponds to the communication opening 125 on the outer peripheral surface thereof. An outer peripheral tooth portion 211 is provided. The outer rotor 22 has a hollow shape and is fitted in the eccentric hole of the eccentric ring 21, and the outer peripheral surface of the outer rotor 22 is in contact with the inner peripheral surface of the eccentric ring 21, A plurality of internal teeth are protruded from the periphery at intervals. On the other hand, the inner rotor 23 has a hollow shape and is rotatably fitted into the hollow shape of the outer rotor 22, and a plurality of external teeth are provided at intervals on the outer peripheral surface of the inner rotor 23. A part of the outer teeth of the inner rotor 23 can mesh with a part of the inner teeth of the outer rotor 22.

As shown in FIGS. 4 to 6, the adjustment valve 30 is movably fitted in the first chamber 115 of the first shell portion 11 so as to seal the first series flow path 114, the adjustment ring 31, An adjustment plug 32, an adjustment spring 33, and an adjustment piston 34 are provided.
Among them, the adjustment ring 31 is fitted on the side of the first chamber 115 opposite to the first flow path 114 so as to contact the inner wall of the first chamber 115 of the first shell portion 11. The adjustment plug 32 is fitted into the first chamber 115 so as to contact the adjustment ring 31. The adjustment spring 33 is attached to the first chamber 115 so that one end abuts on the adjustment plug 32. The adjustment piston 34 penetrates the first chamber 115 so as to be in contact with the inner peripheral surface of the first chamber 115 via the outer peripheral surface.
Then, the inner end of the adjustment piston 34 abuts on the first stepped portion 116 to seal the first communication passage 114, and a recess is formed in the outer end of the adjustment piston 34, and the adjustment spring The other end of 33 is fitted in the recess of the adjustment piston 34, and an annular recess 341 is provided in the outer peripheral surface of the adjustment piston 34 at a location corresponding to the backflow hole 118 and the communication hole 119 of the first shell portion 11. Is done.

As shown in FIGS. 2, 4, and 7, the drive valve 40 is movably fitted in the second chamber 123 of the second shell portion 12 so as to seal the second communication flow path 122, and is connected to the communication opening. The pressure ring 20 is combined with the pressure member 20 via a drive ring 41, a drive plug 42, a drive spring 43, and a drive piston 44.
Among them, the drive ring 41 is fitted on the side of the second chamber 123 opposite to the second communication flow path 122 so as to contact the inner wall of the second chamber 123 of the second shell portion 12. The drive plug 42 is fitted into the second chamber 123 so as to contact the drive ring 41. The drive spring 43 is attached to the second chamber 123 so that one end thereof is in contact with the drive plug 42. The drive piston 44 is pierced through the second chamber 123 so as to be in contact with the inner peripheral surface of the second chamber 123 via the outer peripheral surface.
The inner end of the drive piston 44 abuts on the second stepped portion 124 to seal the second communication channel 122, and a recess is formed in the outer end of the drive piston 44. The end is fitted into the recess of the drive piston 44. In addition, a drive rack 441 is provided in the longitudinal direction at a location corresponding to the communication opening 125 of the second shell portion 12 on the outer peripheral surface of the drive piston 44, and the drive rack 441 is connected to the eccentric ring 21 via the communication opening 125. It meshes with the outer peripheral tooth portion 211.

  During operation of the multistage variable displacement oil pump according to the present invention, the inner rotor 23 and the outer rotor 22 rotate in the same direction, and the outer peripheral surface of the outer rotor 22 contacts the inner peripheral surface of the eccentric ring 21. Since the ring 21 is engaged with the drive piston 44, the eccentric ring 21 does not rotate even when the outer rotor 22 rotates.

  5 to 7 show a multistage variable displacement oil pump according to the present invention used in a normal state. In this case, the liquid supply pressure in the outflow area 104 is set to a normal use state, the adjustment piston 34 is pressed against the first step portion 116 by the biasing force of the adjustment spring 33, and the driving piston 44 is biased by the driving spring 43. Is pressed against the second stepped portion 124, that is, the liquid feeding pressure and the outflow amount are not adjusted.

  As shown in FIGS. 8 and 15, if necessary, the outlet hydraulic pressure 51 and the outlet outlet flow rate 52 in the outflow zone 104 are set so that the operation performance curve becomes the first-stage hydraulic pressure / outflow rate change zone 501. When it is raised, the pressurized oil in the outflow area 104 passes through the second communication flow path 122 and presses the inner end of the drive piston 44 to resist the biasing force of the drive spring 43, so that the drive piston 44 moves to the second step. It moves to the drive plug 42 until it leaves | separates from the part 124 and contact | abuts to the drive plug 42. FIG. At this time, since the drive piston 44 is meshed with the eccentric ring 21, when the eccentric ring 21 rotates to a predetermined angle and the meshing state between the outer rotor 22 and the inner rotor 23 changes, the inner tooth portion of the outer rotor 22 is changed. Since the gap between the outer rotor 22 and the outer tooth portion of the inner rotor 23 also changes, the amount of pressurized oil flowing out can be adjusted by rotating the outer rotor 22 and the inner rotor 23.

As shown in FIGS. 9, 10, and 15, if the operation performance curve is changed to the second-stage hydraulic pressure and spill amount change area 502 as necessary (that is, the actual required oil amount is the first-stage hydraulic pressure). And the outlet oil pressure 51 in the outflow area 104 is slightly higher than the outlet oil pressure 51 in the first stage oil pressure and outflow quantity change area 501.
Further, as shown in FIG. 8, when the driving piston 44 is pressed against the driving plug 42 and the inner end of the adjustment piston 34 is pressed with the pressurized oil in the outflow area 104 and separated from the first step portion 116, Since the annular recess 341 corresponds to the one communication hole 119, a part of the pressurized oil in the outflow area 104 sequentially flows in the guide flow path 113, the communication hole 119, the annular recess 341, the one reverse flow hole 118, and the reverse flow path 117. And return to the inflow area 103, and return the oil in the outflow area 104 back to the inflow area 103, as shown in FIG. Accordingly, the outlet hydraulic pressure 51 and the outlet outlet flow amount 52 can be adjusted.

As shown in FIGS. 11, 12, and 15, when the oil spillage is further increased, the operating performance curve becomes an increase area 503 of the spillage at the outlet, and at this time, the pressurized oil in the spillage area 104 is When the adjustment piston 34 is further pressed, the adjustment piston 34 is moved to the adjustment plug 32 and the annular recess 341 is separated from the communication hole 119.
As a result, the adjustment piston 34 seals the guide channel 113 and the pressurized oil passes through the backflow hole 118 and returns to the inflow area 103, so that the outflow oil pressure 51 and the outflow outflow amount 52 of the outflow area 104 are reduced. Since it can be greatly increased by adjustment, it can sufficiently meet the demand.

  On the other hand, as shown in FIG. 13 to FIG. 15, when the demand is slightly reduced, the operation performance curve becomes the third-stage hydraulic pressure and flow rate change area 504. At this time, the outlet hydraulic pressure 51 and the outlet outlet amount 52 are higher than the state of the outlet outlet increased amount area 503 until the pressurized oil in the outlet area 104 abuts the adjusting piston 34 against the adjusting plug 32. Since the adjustment piston 34 does not shield a part of the other communication hole 119 by pressing, the pressurized oil in the guide channel 113 passes through the other communication hole 119 and passes from the other backflow hole 118 to the inflow area 103. Turn back. At the same time, the pressurized oil in the first chamber 115 is also returned to the inflow area 103 through one of the backflow holes 118, so that the outlet hydraulic pressure 51 and the outlet outlet outflow amount 52 can be adjusted according to demand.

In the multistage variable displacement oil pump according to the present invention, an oil passage is constituted by the guide flow path 113 of the pump housing 10, the two backflow holes 118, the two communication holes 119, etc. Therefore, when the pressurizing member 20 is driven by the drive valve 40, the outlet hydraulic pressure 51 and the outlet outlet outflow amount 52 in the first-stage hydraulic pressure / outflow amount change area 501 can be adjusted.
In addition, the operation performance curves according to the actual required oil amount include a second-stage hydraulic pressure and outflow amount change area 502, an outflow amount increase area 503, a third-stage hydraulic pressure and outflow quantity change area 504, and the like. Divide into different states. Since the regulating valve 30 moves according to changes in the outlet hydraulic pressure 51 and the outlet outlet flow rate 52 in the outflow area 104, the oil in the outflow area 104 and the inflow area 103 can be adjusted by the backflow means. Therefore, according to the multistage variable displacement oil pump according to the present invention, the outlet hydraulic pressure 51 and the outlet outlet flow rate 52 can be adjusted in multiple stages according to demand.

DESCRIPTION OF SYMBOLS 10 Pump housing 101 Inlet 102 Outflow flow path 103 Inflow area 104 Outflow area 11 First shell part 111 Inflow tank 112 Outflow tank 113 Guide flow path 114 First serial flow path 115 First chamber 116 First step part 117 Reverse flow path 118 Backflow hole 119 Connecting hole 12 Second shell portion 120 Outflow portion 121 Housing portion 122 Second communication channel 123 Second chamber 124 Second step portion 125 Communication opening 20 Pressure member 21 Eccentric ring 22 Outer rotor 23 Inner rotor 30 Adjustment Valve 31 Adjustment ring 32 Adjustment plug 33 Adjustment spring 34 Adjustment piston 341 Annular recess 40 Drive valve 41 Drive ring 42 Drive plug 43 Drive spring
44 Drive piston 441 Drive rack 501 First stage hydraulic pressure and outflow rate change area 502 Second stage hydraulic pressure and outflow quantity change area 503 Outlet outflow quantity increase area 504 Third stage hydraulic pressure and outflow quantity change area 51 Flow Outlet hydraulic pressure 52 Outlet flow rate

Claims (8)

A pump housing, a pressurizing member, a regulating valve, and a drive valve;
One of the pump housings has an inlet, an outlet channel, an inlet zone, an outlet zone, a guide channel, a first communication channel, a first chamber, a plurality of backflow holes, and a plurality of counterflow holes. A communication hole is formed, wherein the inlet and the outflow passage are respectively formed in the pump housing so as to communicate with the inside of the pump housing, and the inflow area is formed in the pump housing so as to correspond to the inlet. Formed in the pump housing such that the outflow area corresponds to the outflow passage, the guide passage and the first communication passage are spaced apart from each other, and a plurality of communication holes are provided. Communicated with each other, the first communication channel communicated with the first chamber and recessed in the pump housing, the first chamber communicated with the inflow area through a plurality of backflow holes,
On the other side of the pump housing, an accommodation portion, a second communication channel, a second chamber, and a communication opening are formed, and the second communication channel communicates with the accommodation unit, and the second chamber. Communicating, the second chamber communicates with the accommodating portion through the communicating opening;
The pressurizing member is rotatably installed inside the pump housing, and is disposed so as to correspond to the second chamber and the communication opening.
The adjustment valve is fitted in the first chamber of the pump housing so as to be movable so as to seal the first series flow path, and has an annular recess at a position corresponding to the plurality of backflow holes and the plurality of communication holes on the outer peripheral surface thereof. Is recessed,
The drive valve is movably fitted in the second chamber of the pump housing so as to seal the second communication flow path, and is combined with the pressurizing member through the communication opening.
Multi-stage variable displacement oil pump.   The pump housing includes a first shell portion and a second shell portion, and the first shell portion includes an inlet, an inflow tank, an outflow tank, a guide channel, a first series passage, One chamber, a first stepped portion, a reverse flow path, a plurality of backflow holes, and a plurality of communication holes, of which the inlet is formed in the first shell, and the inflow tank communicates with the inlet And the recess is formed in the first shell, the outlet tank is recessed in the first shell at a distance from the inlet tank, and the guide channel communicates with the outlet tank, and the first shell The first series flow channel communicates with the outflow tank and is recessed in the first shell, the first chamber is recessed in the first shell, and the first The step portion is formed at a position where the first series flow path and the first chamber are in contact with each other, and the inner end of the adjustment valve is in contact with the first step portion to form the first series. The flow path is sealed, and the reverse flow path communicates with the inflow tank and is recessed in the first shell, and the number of the plurality of reverse flow holes is two. In order to connect the first chamber and the first chamber, the first shell portion is formed to communicate with the reverse flow path at an interval, and the number of the plurality of communication holes is two, and the two communication holes are respectively In order to communicate the guide channel and the first series flow channel, the guide channel is formed between the guide channel and the first series flow channel at an interval and arranged to correspond to the communication holes, respectively. The second shell portion is detachably combined with the first shell portion, and includes an outflow channel, a second communication channel, a second chamber, a second stepped portion, and a communication opening. The flow path is formed in the second shell portion, and the storage portion includes the inflow tank and the outflow tank of the first shell portion. The second shell part is recessed so as to face, and is provided with an outflow part communicating with the outflow channel, and a corresponding part between the accommodating part and the inflow tank constitutes an inflow area, and the correspondence between the outflow part and the outflow tank And the pressure member is installed in the housing part of the pump housing, and the second communication channel communicates with the outflow part and is recessed in the second shell part, The second chamber is recessed in the second shell, and the communication opening is formed in the second shell so as to communicate the second chamber and the accommodating portion, and the second stepped portion is formed in the second communication. 2. The multistage variable according to claim 1, wherein the flow valve and the second chamber are formed in contact with each other, and the drive valve contacts the second step portion to seal the second communication flow path. Capacity type oil pump.   The pressurizing member includes an eccentric ring, an outer rotor, and an inner rotor. The eccentric ring is a hollow ring, the inner peripheral edge of which is provided in a hollow and eccentric position, and is rotatable in the pump housing. The outer rotor has a hollow shape and is fitted in the hollow eccentric position of the eccentric ring, and the outer peripheral surface thereof is an eccentric ring. A plurality of internal teeth are projected at intervals on the inner peripheral edge, while the inner rotor has a hollow shape and is rotatably fitted into the hollow inner portion of the outer rotor. A plurality of external teeth are provided on the outer circumferential surface of the outer rotor so as to be spaced apart from each other, and some of the external teeth are engaged with some of the internal teeth of the outer rotor. Multi-stage variable capacity described in 2 Oil pump.   An outer peripheral tooth portion corresponding to the communication opening of the pump housing is provided on the outer peripheral surface of the eccentric ring in the pressurizing member, and a drive rack is provided at a location corresponding to the communication opening of the second shell portion in the drive valve, 4. The multistage variable displacement oil pump according to claim 3, wherein the drive rack is meshed with the outer peripheral teeth of the eccentric ring through the communication opening.   The adjustment valve includes an adjustment ring, an adjustment plug, an adjustment spring, and an adjustment piston, and the adjustment ring is in contact with the inner wall of the first chamber of the pump housing. The adjustment plug is fitted to the first chamber so as to abut the adjustment ring, and the adjustment spring is attached to the first chamber so that one end abuts the adjustment plug. The adjusting piston is movably penetrated through the first chamber so that the outer peripheral surface thereof is in contact with the inner peripheral surface of the first chamber, and an annular recess is provided in the outer peripheral surface in the radial direction. The first series passage is sealed by an inner end, a recess is formed in the outer end, and the other end of the adjustment spring is fitted in a recess of the adjustment piston. Multistage variable displacement oil Amplifier.   The drive valve includes a drive ring, a drive plug, a drive spring, and a drive piston. The drive ring abuts against the inner wall of the second chamber of the pump housing, and the second communication channel of the second chamber. The drive plug is fitted to the opposite side, the drive plug abuts the drive ring, and is fitted to the second chamber, and is attached to the second chamber so that one end of the drive spring abuts the drive plug. The outer peripheral surface abuts on the inner peripheral surface of the second chamber and is movably provided in the second chamber, and a drive rack is provided in the longitudinal direction on the outer peripheral surface. The multistage variable displacement type oil according to claim 4, wherein a recess is formed at an outer end of the seal, and the other end of the drive spring is fitted into a recess of the drive piston. Pump.   The adjustment valve includes an adjustment ring, an adjustment plug, an adjustment spring, and an adjustment piston, and the adjustment ring is configured to contact the inner wall of the first chamber of the first shell so that the first ring of the first chamber is in contact with the first chamber. The adjustment plug is fitted into the first chamber so as to contact the adjustment ring, and the adjustment spring is attached to the first chamber so that one end is in contact with the adjustment plug. The adjusting piston is movably penetrated through the first chamber so that its outer peripheral surface abuts on the inner peripheral surface of the first chamber, and an annular recess is provided in the outer peripheral surface in the radial direction, 3. The adjustment piston according to claim 2, wherein an inner end of the adjustment piston is brought into contact with the first step portion, a recess is formed in the outer end, and the other end of the adjustment spring is fitted into the recess of the adjustment piston. Multistage variable displacement oil as described Amplifier.   The drive valve includes a drive ring, a drive plug, a drive spring, and a drive piston, and the drive ring of the second chamber communicates with the inner wall of the second chamber of the second shell. The drive plug is fitted into the second chamber so that it is in contact with the drive ring, and the drive spring is attached to the second chamber so that one end is in contact with the drive plug. The drive piston is movably provided in the second chamber so that the outer peripheral surface is in contact with the inner peripheral surface of the second chamber, and a drive rack is provided in the longitudinal direction on the outer peripheral surface. 3. The multi-passage of claim 2, wherein an inner end of the first contact portion is in contact with the second stepped portion, a recess portion is formed in the outer end portion, and the other end of the drive spring is fitted into the recess portion of the drive piston. Stage variable capacity type -Pumped.

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