WO2016021072A1 - 油圧ポンプ・モータ - Google Patents
油圧ポンプ・モータ Download PDFInfo
- Publication number
- WO2016021072A1 WO2016021072A1 PCT/JP2014/071104 JP2014071104W WO2016021072A1 WO 2016021072 A1 WO2016021072 A1 WO 2016021072A1 JP 2014071104 W JP2014071104 W JP 2014071104W WO 2016021072 A1 WO2016021072 A1 WO 2016021072A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- residual pressure
- port
- pressure
- cylinder bore
- valve plate
- Prior art date
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
- F03C1/00—Reciprocating-piston liquid engines
- F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
- F03C1/06—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
- F03C1/0678—Control
- F03C1/0686—Control by changing the inclination of the swash plate
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
- F04B1/22—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block having two or more sets of cylinders or pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
- F03C1/00—Reciprocating-piston liquid engines
- F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
- F03C1/06—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
- F03C1/0602—Component parts, details
- F03C1/0605—Adaptations of pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
- F03C1/00—Reciprocating-piston liquid engines
- F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
- F03C1/06—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
- F03C1/061—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
- F03C1/0623—Details, component parts
- F03C1/0626—Cylinders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
- F03C1/00—Reciprocating-piston liquid engines
- F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
- F03C1/06—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
- F03C1/061—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
- F03C1/0623—Details, component parts
- F03C1/0631—Wobbler or actuated element
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
- F03C1/00—Reciprocating-piston liquid engines
- F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
- F03C1/06—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
- F03C1/0636—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
- F03C1/0644—Component parts
- F03C1/0655—Valve means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
- F03C1/00—Reciprocating-piston liquid engines
- F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
- F03C1/06—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
- F03C1/0678—Control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/122—Details or component parts, e.g. valves, sealings or lubrication means
- F04B1/124—Pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/14—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
- F04B1/141—Details or component parts
- F04B1/143—Cylinders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/14—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
- F04B1/141—Details or component parts
- F04B1/146—Swash plates; Actuating elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
- F04B1/2014—Details or component parts
- F04B1/2042—Valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/26—Control
- F04B1/28—Control of machines or pumps with stationary cylinders
- F04B1/29—Control of machines or pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/26—Control
- F04B1/30—Control of machines or pumps with rotary cylinder blocks
- F04B1/303—Control of machines or pumps with rotary cylinder blocks by turning the valve plate
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
Definitions
- the present invention relates to an axial type hydraulic pump / motor (hydraulic pump or hydraulic motor) capable of reducing erosion (erosion) and noise caused by aeration that occur when shifting from a high-pressure process to a low-pressure process and increasing rotational efficiency. ).
- an axial hydraulic piston pump is a cylinder in which a plurality of cylinders are provided that rotate integrally with a rotary shaft that is rotatably provided in a case, and that are separated in the circumferential direction and extend in the axial direction.
- the cylinder block rotates together with the operating shaft in the case, and the piston reciprocates in each cylinder of the cylinder block.
- the hydraulic fluid sucked into the cylinder from the suction port is pressurized by the piston and discharged from the discharge port as high-pressure hydraulic fluid.
- the inside of the cylinder that discharges hydraulic oil through the discharge port of the valve plate in the discharge process has a high pressure.
- the hydraulic oil having a high pressure in the cylinder suddenly flows into the low-pressure suction port and causes a large pressure fluctuation.
- aeration in which air is mixed in the state of fine bubbles is generated in the hydraulic oil in the suction port. This aeration generates erosion and noise, and reduces efficiency.
- Patent Document 1 a residual pressure release hole is provided, and when shifting from the discharge process to the suction process, the hydraulic oil having a high pressure in the cylinder is returned to the suction port. As a result, the change in hydraulic oil from the discharge process to the suction process becomes gradual, and when the cylinder port communicates with the suction port, the hydraulic oil pressure in the cylinder and the hydraulic oil pressure in the suction port are made the same. .
- this residual pressure release hole is directly connected to the suction port.
- aeration is generated in the hydraulic oil that has escaped from the cylinder through the residual pressure release hole.
- produced will return to a suction port as it is. For this reason, erosion and noise due to aeration occur.
- the present invention has been made in view of the above, and is an axial type hydraulic pump capable of reducing erosion and noise caused by aeration that occurs when shifting from a high pressure process to a low pressure process, and increasing rotational efficiency.
- An object is to provide a motor.
- a hydraulic pump / motor has a cylinder block in which a plurality of cylinder bores are formed around a rotation shaft, which has a high-pressure side port and a low-pressure side port.
- An axial type hydraulic pump / motor that slides relative to the valve plate and controls the amount of reciprocation of the piston in each cylinder bore by the inclination of the swash plate.
- a residual pressure discarding port that communicates until the low pressure side port communicates with the low pressure side port, and a residual pressure value in the top dead center side cylinder bore between the top dead center side cylinder bore and the low pressure side port
- a residual pressure acquisition unit that is obtained by actual measurement or estimation, a flow path between the residual pressure release port and the hydraulic oil tank based on the value of the residual pressure obtained by the residual pressure acquisition unit, and the residual pressure release Po
- the hydraulic pump / motor according to the present invention is characterized in that, in the above invention, the direction switching valve has a flow rate adjusting mechanism.
- the residual pressure acquisition unit is provided in the cylinder block, and is a sliding surface between the cylinder block and the valve plate, and rotates the cylinder bore.
- a residual pressure port having an opening outside the moving region and communicating with the inside of the cylinder bore, and provided in the valve plate, is temporarily connected to the residual pressure port through the opening of the residual pressure port as the cylinder block rotates.
- a residual pressure detection port for detecting and holding the residual pressure in the top dead center side cylinder bore, and the directional control valve is configured to control the residual pressure held by the residual pressure detection port to a control signal pressure.
- the channel switching and the channel blocking are performed.
- the direction switching valve is integrally formed in the valve plate.
- the residual pressure acquisition unit is a detection unit that detects one or more values of a swash plate angle, a rotation speed, a discharge pressure, and a hydraulic oil temperature, And a controller that estimates a residual pressure in the top dead center side cylinder bore based on the one or more values and generates a control signal pressure of the direction switching valve based on the estimated residual pressure.
- the hydraulic pump / motor according to the present invention is the hydraulic pump / motor according to the present invention, wherein the direction switching valve is provided between the residual pressure release port and the hydraulic oil tank when the residual pressure value is larger than a first predetermined value. And when the residual pressure value is between the first predetermined value and a second predetermined value smaller than the first predetermined value, between the residual pressure discarding port and the hydraulic oil tank and the residual pressure. The pressure relief port and the low pressure side port are blocked, and when the residual pressure value is smaller than the second predetermined value, the residual pressure relief port and the low pressure side port are communicated with each other. And
- the residual pressure release port provided on the valve plate and communicated until the top dead center side cylinder bore communicates with the low pressure side port, and the top dead center side cylinder bore communicates with the low pressure side port.
- a residual pressure acquisition unit that obtains the value of the residual pressure in the top dead center side cylinder bore by actual measurement or estimation until the direction switching valve has the residual pressure value obtained by the residual pressure acquisition unit.
- the flow path between the residual pressure release port and the hydraulic oil tank and the flow path between the residual pressure release port and the low pressure side port are switched and the flow path is shut off. Since the residual pressure acquisition unit acquires highly accurate residual pressure, it is possible to reduce erosion (erosion) and noise caused by aeration that occur when moving from a high pressure process to a low pressure process, and to improve rotational efficiency. it can.
- FIG. 1 is a cross-sectional view illustrating a schematic configuration of the hydraulic pump according to the first embodiment of the present invention.
- 2 is a cross-sectional view taken along line AA of the hydraulic pump shown in FIG.
- FIG. 3 is a view showing a cross section taken along line BB of the hydraulic pump shown in FIG. 1 and a cross section of the hydraulic oil tank connected to the hydraulic pump.
- FIG. 4 is a diagram showing a configuration in which the sliding surface of the cylinder block with the valve plate is viewed in the ⁇ X direction.
- FIG. 5 is a diagram showing the relationship between the spool stroke and the opening area of the direction switching valve shown in FIG.
- FIG. 6 is a diagram showing the relationship between the residual pressure of the direction switching valve shown in FIG. 3 and the spool stroke.
- FIG. 7 is a schematic diagram showing the configuration of the second embodiment of the present invention.
- FIG. 8 is a cross-sectional view taken along the line DD showing the configuration of the direction switching valve when the residual pressure is small.
- FIG. 9 is a sectional view taken along line DD showing the configuration of the direction switching valve when the residual pressure is medium.
- FIG. 10 is a cross-sectional view taken along line DD showing the configuration of the direction switching valve when the residual pressure is large.
- FIG. 11 is a schematic diagram showing the configuration of the third embodiment of the present invention.
- FIG. 12 is a diagram showing the relationship between the swash plate angle and the residual pressure.
- FIG. 13 is a diagram showing the relationship between the rotational speed and the residual pressure.
- FIG. 14 is a diagram illustrating the relationship between the discharge pressure and the residual pressure.
- FIG. 15 is a diagram illustrating the relationship between the hydraulic oil temperature and the residual pressure.
- FIG. 16 is a cross-sectional view showing a state in the cylinder bore when the swash plate angle becomes maximum.
- FIG. 17 is a cross-sectional view showing a state in the cylinder bore when the swash plate angle is minimized.
- FIG. 1 is a cross-sectional view illustrating a schematic configuration of the hydraulic pump according to the first embodiment of the present invention.
- FIG. 2 is a cross-sectional view taken along line AA of the hydraulic pump shown in FIG.
- the hydraulic pump shown in FIGS. 1 and 2 converts engine rotation and torque transmitted to the shaft 1 into hydraulic pressure, and discharges the oil sucked from the suction port P1 from the discharge port P2 as high-pressure hydraulic oil.
- the hydraulic pump is a variable displacement hydraulic pump that can vary the amount of hydraulic oil discharged from the pump by changing the inclination angle a of the swash plate 3.
- the axis along the axis of the shaft 1 is the X axis
- the axis along the inclined central axis that is a line connecting the fulcrum when the swash plate 3 is inclined is the Z axis
- the X axis is inclined
- the axis orthogonal to the Z axis is Y Axis.
- the direction from the input side end of the shaft 1 to the opposite end is defined as the X direction.
- the hydraulic pump is connected to the case 2 and the end cap 8 through a shaft 1 rotatably supported by bearings 9a and 9b, and is connected to the shaft 1 through a spline structure 11.
- the case 2 and the end cap 8 A cylinder block 6 that rotates integrally with the shaft 1, and a swash plate 3 provided between the side wall of the case 2 and the cylinder block 6.
- the cylinder block 6 is provided with a plurality of piston cylinders (cylinder bores 25) arranged at equal intervals in the circumferential direction around the axis of the shaft 1 and parallel to the axis of the shaft 1. Pistons 5 that can reciprocate parallel to the axis of the shaft 1 are inserted into the plurality of cylinder bores 25.
- a spherical concave sphere is provided at the tip of each piston 5 protruding from each cylinder bore 25.
- the spherical convex portion of the shoe 4 fits in the spherical concave portion, and each piston 5 and each shoe 4 forms a spherical bearing. Note that the spherical concave portion of the piston 5 is caulked, and separation from the shoe 4 is prevented.
- the swash plate 3 has a flat sliding surface S on the side facing the cylinder block 6.
- Each shoe 4 slides in a circle or an ellipse while being pressed onto the sliding surface S as the cylinder block 6 rotates in conjunction with the rotation of the shaft 1.
- a spring 15 supported by a ring 14 provided on the inner periphery of the cylinder block 6 in the X direction, a movable ring 16 and a needle 17 that are pressed by the spring 15, and a ring that contacts the needle 17.
- a pressing member 18 is provided. The shoe 4 is pressed against the sliding surface S by the pressing member 18.
- two hemispherical bearings 20 and 21 projecting toward the swash plate 3 are provided at symmetrical positions with the axis of the shaft 1 interposed therebetween.
- two concave spheres are formed at portions corresponding to the arrangement positions of the bearings 20 and 21.
- the bearings of the swash plate 3 are formed by contacting the bearings 20 and 21 with the two concave spheres of the swash plate 3.
- the bearings 20 and 21 are arranged in the Z-axis direction.
- the swash plate 3 is inclined in a plane perpendicular to the XY plane with a line connecting the bearings 20 and 21 as an axis (an axis parallel to the Z axis).
- the inclination of the swash plate 3 is determined by the piston 10 that reciprocates while pressing one end of the swash plate 3 along the X direction from the side wall side of the case 2.
- the reciprocating motion of the piston 10 causes the swash plate 3 to tilt with a line connecting the bearings 20 and 21 as a fulcrum.
- the sliding surface S is also inclined, and the cylinder block 6 rotates as the shaft 1 rotates. For example, as shown in FIGS.
- each shoe 4 when the inclination angle from the XZ plane is a, each shoe 4 is circular on the sliding surface S when the cylinder block rotates counterclockwise as viewed in the X direction. Or it slides elliptically, and the piston 5 in each cylinder bore 25 reciprocates along with this.
- FIG. 3 is a cross-sectional view of the hydraulic pump shown in FIG. 1 taken along line BB.
- FIG. 4 is a diagram showing a configuration in which the sliding surface Sa with the valve plate 7 in the cylinder block 6 is viewed in the ⁇ X direction.
- the end surface on the sliding surface Sa side of the valve plate 7 shown in FIGS. 3 and 4 and the end surface on the sliding surface Sa side of the cylinder block 6 slide with each other as the cylinder block 6 rotates.
- the valve plate 7 has a valve plate suction port PB1 that communicates with the suction port P1 and a valve plate discharge port PB2 that communicates with the discharge port P2.
- the valve plate suction port PB1 and the valve plate discharge port PB2 are provided on the same arc and have a bowl shape extending in the circumferential direction.
- the port PB2 On the same circular arc in which the port PB2 is arranged, it is provided in a bowl shape at equal intervals.
- FIG. 3 and FIG. 4 when the cylinder block 6 rotates clockwise as viewed in the ⁇ X direction, a discharge process is performed on the valve plate discharge port PB2 side on the upper side of FIG.
- the suction process is performed on the lower valve plate suction port PB1 side. Therefore, in this case, the right end side in FIG. 3 is switched from the discharge process to the suction process, and becomes the top dead center where the piston 5 enters the sliding surface Sa side most in the cylinder bore 25. Transition to the state. 3 is switched from the suction process to the discharge process, and the piston 5 is the bottom dead center farthest from the sliding surface Sa side in the cylinder bore 25. When the cylinder port 25P passes through the bottom dead center, the low pressure state shifts to the high pressure state.
- the valve plate 7 is provided with a notch 26.
- the notch 26 is provided so as to extend from the bottom dead center side end of the valve plate discharge port PB2 to the bottom dead center side.
- the notch 26 functions as a self-pressure throttle before the cylinder bore 25 communicates with the valve plate discharge port PB2.
- the valve plate 7 is provided with a residual pressure discarding port 30.
- the residual pressure discarding port 30 is provided in the rotational movement region E of the cylinder port 25P and in the region from the vicinity of the top dead center to the valve plate suction port PB1. Further, the residual pressure discarding port 30 is provided at a position where it can communicate with the cylinder bore 25 before the cylinder bore 25 communicates with the valve plate suction port PB1.
- the valve plate 7 is provided with a residual pressure detection port 40.
- the residual pressure detection port 40 is provided outside the rotational movement region E of the cylinder port 25P and in a region from the vicinity of the top dead center to the valve plate suction port PB1.
- the cylinder block 6 is provided with a residual pressure port 41 that allows the cylinder bore 25 and the residual pressure detection port 40 to communicate with each other.
- the residual pressure port opening 41 a is provided on the sliding surface Sa side so as to rotate and move on a circumference having the same radius as the radius of the residual pressure detection port 40. That is, the residual pressure detection port 40 and the residual pressure port 41 communicate once per rotation of the cylinder block 6. Since the opening on the sliding surface Sa side of the residual pressure detection port 40 is provided outside the rotational movement region E of the cylinder port 25P, when the residual pressure detection port 40 and the residual pressure port 41 do not communicate with each other, the cylinder block 6 It is blocked by. As a result, while the cylinder block 6 rotates once, the residual pressure in the cylinder bore 25 when the residual pressure detection port 40 and the residual pressure port 41 communicate with each other is held.
- the residual pressure detection port 40 may be provided outside the rotational movement area E of the cylinder port 25P, or may be provided inside the rotational movement area E. Further, the residual pressure port 41 is not limited to one, and may be provided for the number of cylinder bores 25, for example. Furthermore, a plurality of residual pressure ports 41 may be provided for one cylinder bore 25.
- the residual pressure detection port 40, the residual pressure port 41, and the residual pressure discarding port are connected so that the cylinder bore 25 and the residual pressure discarding port 30 communicate with each other after the communication between the residual pressure detection port 40 and the residual pressure port 41 is completed.
- 30 are preferably arranged respectively.
- the residual pressure detection port 40 and the residual pressure port 41 described above are the residual pressure in the cylinder bore 25 from the vicinity of the top dead center until the cylinder bore 25 on the top dead center side communicates with the valve plate suction port PB1. It functions as a residual pressure acquisition unit that obtains a value by actual measurement.
- the direction switching valve V10 is connected to the residual pressure discarding port 30, the residual pressure detecting port 40, the valve plate suction port PB1, and the hydraulic oil tank T.
- the residual pressure discarding port 30 is connected to the direction switching valve V10 via the flow path L1.
- the residual pressure detection port 40 is connected to the direction switching valve V10 via the flow path L.
- the valve plate suction port PB1 is connected to the direction switching valve V10 via the flow path L2.
- the hydraulic oil tank T is connected to the direction switching valve V10 via the flow path L3.
- the direction switching valve V10 uses the residual pressure held in the residual pressure detection port 40 as a control signal pressure for moving the spool SP.
- the direction switching valve V10 switches the flow path between the residual pressure discarding port 30 and the valve plate suction port PB1 and the flow path between the residual pressure discarding port 30 and the hydraulic oil tank T by the movement of the spool.
- the direction switching valve V10 increases the spool stroke as the detected residual pressure increases.
- the direction switching valve V10 opens the flow path between the residual pressure discarding port 30 and the valve plate suction port PB1, and the residual pressure
- the flow rate control is also performed to reduce the flow rate with the decrease of the flow rate.
- the flow path between the residual pressure discarding port 30 and the hydraulic oil tank T is blocked.
- the hydraulic oil in the valve plate suction port PB1 flows into the cylinder bore 25 via the flow path L2, the flow path L1, and the residual pressure release port 30, and the residual pressure in the cylinder bore 25 increases.
- the direction switching valve V10 has a flow path between the residual pressure discarding port 30 and the hydraulic oil tank T, and the residual pressure.
- the flow paths between the pressure relief port 30 and the valve plate suction port PB1 are both blocked.
- the direction switching valve V10 opens the flow path between the residual pressure discarding port 30 and the hydraulic oil tank T and A flow rate control for increasing the flow rate with the increase is also performed. At this time, the flow path between the residual pressure discarding port 30 and the valve plate suction port PB1 is blocked. In this case, the compressed hydraulic oil in the cylinder bore 25 flows into the hydraulic oil tank T via the residual pressure discarding port 30, the flow path L1, and the flow path L3, and the residual pressure in the cylinder bore 25 decreases.
- the relationship between the residual pressure and the spool stroke is a proportional relationship.
- the hydraulic oil tank T is provided with a partition plate 50 that divides the hydraulic oil into horizontal regions E1 and E2.
- the hydraulic oil in the cylinder bore 25 containing a large amount of air flows into the region E1 through the flow path L3.
- hydraulic fluid is supplied from the region E2 to the valve plate suction port PB1 side through the flow path L4.
- the air in the hydraulic oil that has flowed into the region E1 is removed within the region E1.
- the clean hydraulic oil with less air in the region E1 flows into the region E2 through the upper part of the partition plate 50.
- a horizontally extending shielding plate 51 is provided above the hydraulic oil outlet. By providing this shielding plate 51, clean hydraulic oil that does not contain settled dust or the like is supplied to the valve plate suction port PB1 side.
- the residual pressure in the cylinder bore 25 is measured using the residual pressure detection port 40 and the residual pressure port 41, it is possible to perform highly accurate residual pressure control. For example, when the residual pressure in the cylinder bore 25 is high, this residual pressure can be used as rotation assistance. Further, when the residual pressure in the cylinder bore 25 is low, the residual pressure can be increased so that rotation is not suppressed. This residual pressure control increases the rotation efficiency. On the other hand, the residual pressure in the cylinder bore 25 can be smoothly reduced before communicating with the valve plate suction port PB1 when shifting from the discharge process to the suction process. For this reason, when the cylinder bore 25 communicates with the valve plate suction port PB1, generation of aeration is suppressed. This also reduces erosion and noise due to aeration.
- the direction switching valve V ⁇ b> 10 shown in the first embodiment is embedded in the valve plate 7, and the direction switching valve V ⁇ b> 10 is integrated with the valve plate 7.
- the direction switching valve V ⁇ b> 10 is provided in the vicinity of the residual pressure detection port 40 and the residual pressure discarding port 30. Accordingly, the lengths of the residual pressure detection port 40 and the flow path L, the residual pressure discarding port 30, the flow path L1, and the flow path L2 can be shortened.
- FIG. 8 to 10 are cross-sectional views taken along line DD showing the configuration of the direction switching valve V10 shown in FIG.
- FIG. 8 shows the configuration of the direction switching valve V10 when the residual pressure is small.
- FIG. 9 shows the configuration of the direction switching valve V10 when the residual pressure is medium.
- FIG. 10 shows the configuration of the direction switching valve V10 when the residual pressure is large.
- a residual pressure detection port 40 communicates with the upper portion of the spool SP. Further, an insertion hole 61 is provided in the end gap 8 in the lower direction of the spool SP, and a coil spring 62 is fitted along the inner periphery thereof. The tip of the spool SP is inserted into the coil spring 62. Then, the spool SP stops at a position where the residual pressure held by the residual pressure detection port 40 and the pressing force of the coil spring 62 are balanced.
- FIG. 11 is a schematic diagram showing the configuration of the third embodiment.
- the swash plate angle D1, the rotational speed D2, the discharge pressure D3, and the hydraulic oil temperature D4 described above are input to the controller CT.
- the swash plate angle D1 is obtained by acquiring the stroke amount by the reciprocating motion of the piston 10 (see FIG. 2).
- the rotation speed is acquired by the rotation speed sensor 100 (see FIG. 2).
- the discharge pressure D3 is obtained by the pressure sensor 103 (see FIG. 1).
- the hydraulic oil temperature D4 is obtained by the temperature sensor 104 (see FIG. 1).
- the controller CT outputs a control signal corresponding to the estimated residual pressure to the direction switching valve V10 via the communication line LA.
- the direction switching valve V10 controls the stroke of the spool SP by controlling an electromagnetic valve or the like based on a control signal input from the controller CT.
- the direction switching valve V10 switches the flow path between the flow paths L1 and L3 and the flow path between the flow paths L1 and L2 and shuts off the flow path as in the first and second embodiments by controlling the spool stroke. And flow control.
- the controller CT estimates that the residual pressure is small because the residual pressure oil amount L10 is small as shown in FIG. . Further, even when the rotational speed D2 is low, it is estimated that the residual pressure is small because it does not take time to extract the residual pressure. Further, when the discharge pressure D3 is small, the hydraulic oil at the discharge pressure D3 flows into the cylinder bore 25, so it is estimated that the residual pressure is small. Further, when the hydraulic oil temperature D4 is large (high), it is estimated that the residual pressure is small because the density of the hydraulic oil is low and the viscosity is low, so that it does not take time to extract the residual pressure.
- the stroke amount detection unit, the rotational speed sensor 100, the pressure sensor 103, the temperature sensor 104, and the controller CT due to the reciprocation of the piston 10 function as a residual pressure acquisition unit that obtains the value of the residual pressure in the cylinder bore 25 by estimation. To do.
- the hydraulic pump has been described as an example.
- the present invention is not limited to this and can be applied to a hydraulic motor.
- the high pressure side corresponds to the discharge side of the hydraulic pump
- the low pressure side corresponds to the suction side of the hydraulic pump.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Reciprocating Pumps (AREA)
Abstract
Description
[油圧ポンプの全体構成]
図1は、本発明の実施の形態1にかかる油圧ポンプの概要構成を示す断面図である。また、図2は、図1に示した油圧ポンプのA-A線断面図である。図1および図2に示した油圧ポンプは、シャフト1に伝達されたエンジン回転とトルクとを油圧に変換し、吸込ポートP1から吸い込まれた油を、高圧の作動油として吐出ポートP2から吐出するものである。また、この油圧ポンプは、斜板3の傾斜角aを変化させることによってポンプからの作動油の吐出量を可変にすることができる可変容量型の油圧ポンプである。
ここで、エンドキャップ8側に固定された弁板7と、回転するシリンダブロック6とは、摺動面Saを介して接している。図3は、図1に示した油圧ポンプのB-B線断面図である。また、図4は、シリンダブロック6における弁板7との摺動面Saを-X方向にみた構成を示す図である。図3および図4に示した弁板7の摺動面Sa側の端面とシリンダブロック6の摺動面Sa側の端面とは、シリンダブロック6が回転することによって互いに摺動する。
また、弁板7には、残圧検出ポート40が設けられる。残圧検出ポート40は、シリンダポート25Pの回転移動領域Eの外側であって、上死点近傍から弁板吸込ポートPB1に至る領域に設けられる。
ここで、方向切換弁V10は、残圧捨てポート30、残圧検出ポート40、弁板吸込ポートPB1、及び作動油タンクTに接続される。残圧捨てポート30は、流路L1を介して方向切換弁V10に接続される。残圧検出ポート40は、流路Lを介して方向切換弁V10に接続される。弁板吸込ポートPB1は、流路L2を介して方向切換弁V10に接続される。作動油タンクTは、流路L3を介して方向切換弁V10に接続される。
この実施の形態2では、図7に示すように、実施の形態1に示した方向切換弁V10が弁板7内に埋め込まれ、方向切換弁V10は弁板7と一体化されている。方向切換弁V10は、残圧検出ポート40及び残圧捨てポート30の近傍に設けられている。これによって、残圧検出ポート40及び流路L、残圧捨てポート30及び流路L1、及び流路L2の長さを短くすることができる。
図8~図10は、図7に示した方向切換弁V10の構成を示すD-D線断面図である。図8は、残圧が小の場合のときの方向切換弁V10の構成を示している。また、図9は、残圧が中の場合のときの方向切換弁V10の構成を示している。さらに、図10は、残圧が大のときの方向切換弁V10の構成を示している。
この実施の形態3では、斜板3の斜板角D1、シャフト1の回転速度D2、弁板吐出ポートPB2からの吐出圧D3、及び弁板吐出ポートPB2の作動油温度D4と、シリンダボア25内の残圧との関係をもとに、シリンダボア25内の残圧を推定し、この推定した残圧によって方向切換弁V10を制御するようにしている。なお、この実施の形態3では、残圧を推定しているので、残圧検出ポート40及び残圧ポート41は設けていない。
2 ケース
3 斜板
4 シュー
5,10 ピストン
6 シリンダブロック
7 弁板
8 エンドキャップ
9a,9b ベアリング
11 スプライン構造
14 リング
15 ばね
16 可動リング
17 ニードル
18 押圧部材
20,21 軸受け
25 シリンダボア
25P シリンダポート
26 ノッチ
30 残圧捨てポート
40 残圧検出ポート
41 残圧ポート
41a 残圧ポート開口
50 仕切り板
51遮蔽板
61 挿入孔
62 コイルバネ
100 回転速度センサ
103 圧力センサ
104 温度センサ
CT コントローラ
D1 斜板角
D2 回転速度
D3 吐出圧
D4 作動油温度
L,L1~L4 流路
LA 通信ライン
P1 吸込ポート
P2 吐出ポート
PB1 弁板吸込ポート
PB2 弁板吐出ポート
S,Sa 摺動面
SP スプール
T 作動油タンク
V10 方向切換弁
Claims (6)
- 回転軸まわりに複数のシリンダボアが形成されたシリンダブロックが、高圧側ポートと低圧側ポートとを有した弁板に対して摺動し、斜板の傾斜によって各シリンダボア内のピストンの往復動の量を制御するアキシャル型の油圧ポンプ・モータであって、
前記弁板に設けられ、上死点側シリンダボアが前記低圧側ポートに連通するまでの間に連通する残圧捨てポートと、
前記上死点側シリンダボアが前記低圧側ポートに連通するまでの間における前記上死点側シリンダボア内の残圧の値を実測あるいは推定によって求める残圧取得部と、
前記残圧取得部が求めた残圧の値をもとに、前記残圧捨てポートと作動油タンクとの間の流路と、前記残圧捨てポートと前記低圧側ポートとの間の流路との切換及び流路遮断を行う方向切換弁と、
を備えたことを特徴とする油圧ポンプ・モータ。 - 前記方向切換弁は、流量調整機構を有することを特徴とする請求項1に記載の油圧ポンプ・モータ。
- 前記残圧取得部は、
前記シリンダブロックに設けられ、前記シリンダブロックと前記弁板との摺動面であって前記シリンダボアの回転移動領域外に開口を有し、前記シリンダボア内に連通する残圧ポートと、
前記弁板に設けられ、前記シリンダブロックの回転に伴って前記残圧ポートの開口を介して前記残圧ポートと一時的に連通して前記上死点側シリンダボア内の残圧を検出して保持する残圧検出ポートと、
を備え、
前記方向切換弁は、前記残圧検出ポートが保持する残圧を制御信号圧として流路切換及び流路遮断を行うことを特徴とする請求項1または2に記載の油圧ポンプ・モータ。 - 前記方向切換弁は、前記弁板内に一体形成されることを特徴とする請求項3に記載の油圧ポンプ・モータ。
- 前記残圧取得部は、斜板角、回転速度、吐出圧、作動油温度のうちの1以上の値を検出する検出部、及び、該1以上の値をもとに前記上死点側シリンダボア内の残圧を推定し、該推定した残圧をもとに前記方向切換弁の制御信号圧を生成するコントローラであることを特徴とする請求項1または2に記載の油圧ポンプ・モータ。
- 前記方向切換弁は、前記残圧の値が第1所定値よりも大きい場合、前記残圧捨てポートと作動油タンクとの間を連通させ、前記残圧の値が前記第1所定値と該第1所定値よりも小さい第2所定値との間である場合、前記残圧捨てポートと作動油タンクとの間及び前記残圧捨てポートと前記低圧側ポートとの間を遮断し、前記残圧の値が前記第2所定値よりも小さい場合、前記残圧捨てポートと前記低圧側ポートとの間を連通させることを特徴とする請求項1~5のいずれか一つに記載の油圧ポンプ・モータ。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2016539797A JP6118000B2 (ja) | 2014-08-08 | 2014-08-08 | 油圧ポンプ・モータ |
PCT/JP2014/071104 WO2016021072A1 (ja) | 2014-08-08 | 2014-08-08 | 油圧ポンプ・モータ |
US15/306,313 US10598146B2 (en) | 2014-08-08 | 2014-08-08 | Hydraulic pump-motor |
CN201480077883.4A CN106460807B (zh) | 2014-08-08 | 2014-08-08 | 液压泵/马达 |
DE112014006535.8T DE112014006535T5 (de) | 2014-08-08 | 2014-08-08 | Hydraulikpumpenmotor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2014/071104 WO2016021072A1 (ja) | 2014-08-08 | 2014-08-08 | 油圧ポンプ・モータ |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2016021072A1 true WO2016021072A1 (ja) | 2016-02-11 |
Family
ID=55263373
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2014/071104 WO2016021072A1 (ja) | 2014-08-08 | 2014-08-08 | 油圧ポンプ・モータ |
Country Status (5)
Country | Link |
---|---|
US (1) | US10598146B2 (ja) |
JP (1) | JP6118000B2 (ja) |
CN (1) | CN106460807B (ja) |
DE (1) | DE112014006535T5 (ja) |
WO (1) | WO2016021072A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2019167922A (ja) * | 2018-03-26 | 2019-10-03 | 日立建機株式会社 | 可変容量型斜板式閉回路用油圧ポンプ |
CN114364874A (zh) * | 2019-10-03 | 2022-04-15 | 株式会社小松制作所 | 液压泵马达 |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102018205884A1 (de) * | 2018-04-18 | 2019-10-24 | Robert Bosch Gmbh | Axialkolbenmaschine mit Druckentlastung in den Durchtriebsraum |
US11592000B2 (en) * | 2018-07-31 | 2023-02-28 | Danfoss Power Solutions, Inc. | Servoless motor |
JP7377095B2 (ja) | 2019-12-19 | 2023-11-09 | 株式会社小松製作所 | 油圧ポンプ・モータ |
KR102435132B1 (ko) * | 2020-10-13 | 2022-08-23 | 전인준 | 에어 배출 구조를 갖는 유압 제공장치 |
CN117189456B (zh) * | 2023-11-07 | 2024-04-16 | 华侨大学 | 基于滑套换向的径向柱塞液压装置及工作方法 |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5171503A (ja) * | 1974-12-18 | 1976-06-21 | Mitsubishi Heavy Ind Ltd | |
JPS55152369U (ja) * | 1979-04-19 | 1980-11-04 | ||
JPS62139983A (ja) * | 1985-12-16 | 1987-06-23 | Hitachi Constr Mach Co Ltd | 液圧ポンプ・モ−タ装置 |
JPH0214475U (ja) * | 1988-07-14 | 1990-01-30 | ||
JPH08284805A (ja) * | 1995-04-17 | 1996-10-29 | Hitachi Constr Mach Co Ltd | アキシャルピストン型液圧回転機 |
EP2199609A2 (de) * | 2008-12-16 | 2010-06-23 | Robert Bosch GmbH | Axialkolbenmaschine mit Pulsationsminderung |
JP2014111914A (ja) * | 2012-12-05 | 2014-06-19 | Komatsu Ltd | 油圧ポンプ・モータ |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09280159A (ja) | 1996-04-12 | 1997-10-28 | Hitachi Constr Mach Co Ltd | アキシャルピストン型油圧ポンプ |
JP2000064950A (ja) | 1998-08-21 | 2000-03-03 | Honda Motor Co Ltd | 斜板プランジャ式油圧装置 |
US8047120B2 (en) * | 2005-02-10 | 2011-11-01 | Komatsu Ltd. | Hydraulic piston pump with a balance valve |
JP4542473B2 (ja) | 2005-06-30 | 2010-09-15 | 株式会社カワサキプレシジョンマシナリ | 弁板およびそれを備える液圧装置 |
DE112008002255T5 (de) * | 2007-09-19 | 2010-07-22 | Komatsu Ltd. | Hydraulikpumpenmotor und Verfahren zur Vehinderung einer Pulsation eines Hydraulikpumpenmotors |
-
2014
- 2014-08-08 CN CN201480077883.4A patent/CN106460807B/zh active Active
- 2014-08-08 WO PCT/JP2014/071104 patent/WO2016021072A1/ja active Application Filing
- 2014-08-08 JP JP2016539797A patent/JP6118000B2/ja active Active
- 2014-08-08 US US15/306,313 patent/US10598146B2/en active Active
- 2014-08-08 DE DE112014006535.8T patent/DE112014006535T5/de active Pending
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5171503A (ja) * | 1974-12-18 | 1976-06-21 | Mitsubishi Heavy Ind Ltd | |
JPS55152369U (ja) * | 1979-04-19 | 1980-11-04 | ||
JPS62139983A (ja) * | 1985-12-16 | 1987-06-23 | Hitachi Constr Mach Co Ltd | 液圧ポンプ・モ−タ装置 |
JPH0214475U (ja) * | 1988-07-14 | 1990-01-30 | ||
JPH08284805A (ja) * | 1995-04-17 | 1996-10-29 | Hitachi Constr Mach Co Ltd | アキシャルピストン型液圧回転機 |
EP2199609A2 (de) * | 2008-12-16 | 2010-06-23 | Robert Bosch GmbH | Axialkolbenmaschine mit Pulsationsminderung |
JP2014111914A (ja) * | 2012-12-05 | 2014-06-19 | Komatsu Ltd | 油圧ポンプ・モータ |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2019167922A (ja) * | 2018-03-26 | 2019-10-03 | 日立建機株式会社 | 可変容量型斜板式閉回路用油圧ポンプ |
CN114364874A (zh) * | 2019-10-03 | 2022-04-15 | 株式会社小松制作所 | 液压泵马达 |
CN114364874B (zh) * | 2019-10-03 | 2023-10-17 | 株式会社小松制作所 | 液压泵马达 |
Also Published As
Publication number | Publication date |
---|---|
US20170045028A1 (en) | 2017-02-16 |
JP6118000B2 (ja) | 2017-04-19 |
CN106460807A (zh) | 2017-02-22 |
CN106460807B (zh) | 2018-08-03 |
US10598146B2 (en) | 2020-03-24 |
JPWO2016021072A1 (ja) | 2017-04-27 |
DE112014006535T5 (de) | 2016-12-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6118000B2 (ja) | 油圧ポンプ・モータ | |
JP6045745B2 (ja) | 油圧ポンプ・モータ | |
JP5679958B2 (ja) | 可変容量形ポンプ | |
KR101675659B1 (ko) | 펌프 제어 장치 | |
US8734127B2 (en) | Hydraulic pump-motor and method of preventing pulsation of hydraulic pump-motor | |
JP5634119B2 (ja) | アキシャルピストンポンプ | |
KR101766509B1 (ko) | 가변 용량형 사판식 압축기 | |
KR101582615B1 (ko) | 가변 베인 펌프 | |
US9644480B2 (en) | Fluid pressure rotary machine | |
US11236736B2 (en) | Axial piston pump with port plate having balance feed aperture relief feature | |
KR20230040264A (ko) | 유체 기계 및 건설 기계 | |
KR101548432B1 (ko) | 가변 베인 펌프 | |
JP5539807B2 (ja) | 油圧ポンプ・モータ | |
KR100566030B1 (ko) | 가변용량형 압축기용 제어밸브 | |
JP2014111914A (ja) | 油圧ポンプ・モータ | |
US20190055931A1 (en) | Hydraulic rotary machine | |
KR101886725B1 (ko) | 가변 용량형 사판식 압축기 | |
KR101882672B1 (ko) | 가변 용량형 사판식 압축기 | |
KR101877260B1 (ko) | 가변 용량형 사판식 압축기 | |
KR101778920B1 (ko) | 부하감응형 사판식 피스톤 펌프 | |
JP2008297976A (ja) | 可変容量式液圧回転機 | |
JP2007285255A (ja) | アキシャルピストン液圧回転機 | |
JPH04128571A (ja) | 回転斜板式プランジャポンプにおける吐出量制御装置 | |
JPH0421021Y2 (ja) | ||
JPH0367067A (ja) | 斜板型液圧回転機 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 14899369 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2016539797 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 15306313 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 112014006535 Country of ref document: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 14899369 Country of ref document: EP Kind code of ref document: A1 |