KR101943761B1 - Motor assembled hydraulic pump - Google Patents

Abstract

A motor-integrated hydraulic pump according to an embodiment of the present invention includes: a motor pump housing; a motor module disposed annularly inside the motor pump housing; a pump module disposed inside the motor module in order to be driven by the motor module, having a plurality of openings used as either an inlet or an outlet, and including a piston swash plate and a pump piston to pump an actuation fluid while rotating about the openings; and a pump manifold coupled to the motor pump housing and having a hydraulic circuit so that an actuation object is activated by the actuation fluid of the pump module. The embodiment of the present invention proposes a small-sized hydraulic power generator suitable for constructing low capacity actuation force required in a robotic system; proposes a system for applying the actuation to an actuator using the hydraulic oil without a flow rate/pressure control valve by directly controlling the flow rate of hydraulic oil through the electric motor; and provides the motor-integrated hydraulic pump in which a motor, a pump, a hydraulic circuit, a pressure accumulator, and a linear actuator are integrated, and the maintenance is simplified.

Description

[0001] MOTOR ASSEMBLED HYDRAULIC PUMP [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a motor-integrated electric hydraulic pump, and more particularly, to a motor-integrated electric hydraulic pump capable of pumping fluid by integrally embodying the motor.

The electric drive system used for precise control in the mechanical system and the electronic field, especially the robot system, is difficult to satisfy both the output ratio in weight and the driving speed and output required in the field robot field due to the application of the reducer.

Accordingly, a driving system of a new concept replacing a driving system based on a motor-reducer has been proposed.

The hydraulic drive system is advantageous in that the arrangement of the drive units is free compared to the motor, and the power and speed of the drive unit can be made higher than that of the motor of the same capacity.

Such a hydraulic drive system is mainly used in a system requiring a very large force such as an excavator drive and a crane drive. However, in a field where a large force and precise control are required simultaneously due to complexity of control and large nonlinearity, I can not.

In a hydraulic drive system, the system is classified into a structure in which power is generated and a structure in which power is used to move. In order to produce hydraulic power, a system including a rotary power source and a pump structure through power transmission is referred to as a power generator.

The power generating device operates various types of hydraulic pumps (internal gears, external gears, pistons, vanes, etc.) by using a conventional internal combustion engine or an electric motor and transmits hydraulic oil having a high pressure to a hydraulic system.

The small robot system refers to a robot system of the size of an arm or leg structure of a humanoid humanoid. The demand for the construction of a motion system using a hydraulic actuating mechanism in a small robot system is increasing in order to utilize the advantages such as a large force and a flexible response to a reaction force.

On the other hand, the application of the robot of the hydraulic actuating mechanism is limited due to the complexity of the system, the problem of the size of the components used in the conventional industrial environment, the complexity of the control, and the use thereof in the small robot system is limited .

The configuration of the hydraulic force control system includes an internal combustion engine or an electric motor that applies power of a rated hydraulic pump and a pump, a valve and a manifold for performing flow rate and pressure control of the generated hydraulic pressure, and an auxiliary tank And a cooling device. The application of such a complicated hydraulic drive system to a robot system is accompanied by physical and cost problems.

The existing miniature hydraulic power unit has been developed as a system that includes a rated motor, a gear pump, and a reservoir tank, and can perform the operation / stop / position control of a single actuator.

Such a hydraulic force control system is complicated in configuration, and it may cause spatial, physical, and cost problems to be applied to the robot system as it is.

Since a general robot system requires low capacity working force (operating pressure of 0 ~ 60bar, less than 40kg) without requiring high capacity operating force (operating pressure 200 ~ 300bar, 500kg or more) required by commercial equipment, There is a limit in configuring the parts.

The existing small hydraulic power unit can perform operation / stop / position control but it is controlled by simple servo valve control and flow / pressure control valve. Therefore, direct flow / torque sensor using force / The force control is performed through pressure control, so a complicated system must be constructed.

An embodiment of the present invention proposes a compact hydraulic power generator suitable for constituting a low capacity operation force required in a robot system and directly controls the flow rate of the hydraulic fluid through an electric motor so that hydraulic fluid without a flow / A motor, a pump, a hydraulic circuit, an accumulator, and a linear actuator are integrated to provide a motor-integrated electric hydraulic pump with a simple maintenance.

A motor-integrated electric hydraulic pump according to an embodiment of the present invention includes a motor pump housing; A motor module disposed annularly within the motor pump housing; A plurality of openings disposed inside the motor module to be driven by the motor module, the openings being used as an inlet and an outlet, and a piston swash plate and a pump piston for pumping a working fluid while rotating about the plurality of openings, A configured pump module; And a pump manifold coupled to the motor pump housing, the pump manifold including a hydraulic circuit configured to operate the operation object by the working fluid of the pump module, wherein the motor module is fixedly disposed in an annular shape on an inner wall portion of the motor pump housing A stator; And a rotor rotatably disposed within the stator and coupled to the pump module.

The pump module includes: a pump case coupled to the rotor and rotatably coupled to the motor pump housing; A pump cylinder disposed within the pump case and providing a pumping space in which the pump piston is operable, the pump cylinder being disposed at intervals along the circumferential direction; A cylindrical inclined block provided on the inclined portion to which the piston swash plate is contacted and coupled to the motor pump housing; And a central shaft part rotatably coupled to the motor pump housing and disposed to be relatively rotatable in the cylindrical inclined block, and penetratingly connected to the cylinder cylinder part.

The pump piston includes: a piston member movably disposed in the pump cylinder; A spherical spin member connected to the piston member; And a spin joint member connected to the spherical spin member and annularly disposed on the swash plate.

The barrel cylinder portion includes a barrel member in which the pump cylinder is configured; And a space member which is annularly disposed on an outer wall of the barrel member and fixes the barrel member to the pump case.

The pump module further includes an opening block coupled to the motor pump housing on the opposite side of the cylindrical inclined block and having the plurality of openings defined therein and arranged in pairs, the center shaft portion being rotatably inserted into and coupled with the center portion can do.

The opening block may have a concave shape corresponding to the opening block, and the opening block may be formed in a convex shape so that the opening block may be convexly spun to the barrel cylinder part, and the barrel member may have a concave shape corresponding to the opening block.

The hydraulic circuit of the pump manifold includes: a first line connected to any one of the plurality of openings; A second line connected to the other of the plurality of openings; A boosting line connected to the first and second lines and providing an initial boosting pressure; A plurality of check valves disposed in a first connection line connecting the boosting line and the first and second lines; A drain line connected to the pump module and the first and second lines; And a drain confluence line connecting the boosting line to the drain line.

The first and second lines may be connected by a plurality of parallel lines, and each of the plurality of parallel lines and the drain confluent line may be provided with a relief valve for passing a working fluid having a pressure higher than a set pressure.

The hydraulic circuit further comprising: a first pilot check valve disposed at an end of the first line; A second pilot check valve disposed at an end of the second line; A first pressure compensation line connected to the second pilot check valve in the first line; And a second pressure compensation line connected to the first pilot check valve in the second line.

The hydraulic circuit may further include: a second connection line connecting the drain line and the first and second lines; A third pilot check valve disposed on the first line side in the connection line; And a fourth pilot check valve disposed on the second line side in the second connection line.

The pump manifold includes piping corresponding to the hydraulic circuit, and a plurality of ports for supplying and discharging a working fluid are fixed. The plurality of ports include a plurality of input / output ports, a boosting port, and a drain port can do.

The hydraulic circuit may further include a pressure sensor connected to the first and second lines, respectively, and disposed in the pump manifold.

An embodiment of the present invention described above proposes a small hydraulic power generator suitable for constituting a low capacity operation force required in a robot system and directly controls the flow rate of the hydraulic oil through an electric motor to control the flow rate / The present invention proposes a system for applying an operation to an actuator using hydraulic fluid without a valve and can provide a motor-integrated electric hydraulic pump in which a motor, a pump, a hydraulic circuit, an accumulator, and a linear actuator are integrated and a maintenance is simple.

1 is a perspective view of a motor-integrated electric hydraulic pump according to an embodiment of the present invention.
Fig. 2 is an internal projection perspective view of Fig. 1. Fig.
3 is a 3D modeling projection view of a motor-integrated electric hydraulic pump according to an embodiment of the present invention.
4 is a vertical sectional view along the direction of the boosting port of FIG.
FIG. 5 is a plan view of the input / output port of FIG. 3 in the longitudinal direction.
Figure 6 is an exploded schematic view of the major components of Figure 1;
7 is a 3D modeling exploded view of a motor-integrated electric hydraulic pump according to an embodiment of the present invention.
8 is an exploded view in the opposite direction of Fig.
Fig. 9 is a projection stereoscopic view of Fig. 4; Fig.
10 is a longitudinal sectional view in the longitudinal direction with respect to the center line of the boosting port of Fig.
11 is a vertical cross-sectional view in the longitudinal direction with respect to the center line of the left input / output port in Fig.
FIG. 12 is a perspective view of the manifold of FIG. 3; FIG.
13 is a plan view of Fig.
14 is a lower view of Fig.
15 is a hydraulic circuit diagram of a motor-integrated electric hydraulic pump according to an embodiment of the present invention.

Various embodiments of the present invention will now be described by way of specific embodiments illustrated in the accompanying drawings. The differences in the embodiments are to be understood as mutually exclusive matters, and the specific shapes, structures, and characteristics described in connection with one embodiment may be embodied in other embodiments without departing from the spirit and scope of the present invention .

It is to be understood that the position or arrangement of the individual components in accordance with embodiments of the present invention may be varied and that like reference numerals may be used to indicate like or similar features throughout the various aspects, The form may be exaggerated for ease of explanation.

The direction and position of the drawing are described assuming an XYZ Cartesian coordinate system. The top, bottom, right and left coincide with the XY coordinate plane system, and the front, rear, left and right coincide with the YZ coordinate plane system. In the drawings of the embodiments, each of the elements for which the lower elements are not described are assumed to include typical lower elements for having respective assigned functions, and are not limited to the lower elements shown in the figures. It is to be understood that the components illustrated but not shown are included in the embodiments.

The terms used shall be understood to have the traditional meaning of Chinese characters, national language, or English, except those specifically defined, or to have attributes consistent with the terms used in the field. It is to be understood that "comprising, comprising, or having" means having more than one of the other components, "fixed and constrained" And can be moved by the user.

1 to 4, a motor-integrated hydraulic pump according to an embodiment of the present invention includes a motor pump housing 110, a motor module 120 annularly disposed in the motor pump housing 110, A plurality of openings 137 disposed inside the motor module 120 to be driven by the motor module 120 and used as one of the inlet and the outlet are provided and the operating fluid is pumped A pump module 130 configured to include a piston swash plate 131 and a pump piston 140, a pump manifold 150 coupled to the motor pump housing 110, and configured to operate the operation object by a working fluid of the pump module 130, Fold 150. < / RTI >

The motor pump housing 110 is configured to receive the motor module 120 and the pump module 130 therein. The motor pump housing 110 is made by assembling the first and second housings 111 and 112, both of which are cylindrical in shape.

The motor pump housing 110 is secured to the front and rear first and second housings 111 and 112 by assembly bolts annularly arranged at the center. A housing cover (113) is coupled to one side of the motor pump housing (110). A cable connector 115 is provided at an upper portion of the motor pump housing 110 to connect a cable for supplying power to the pump module 130 and transmitting and receiving a control signal.

The motor module 120 includes a stator 121 that is annularly disposed and fixed to an inner wall of the motor pump housing 110, a stator 121 that is rotatably disposed inside the stator 121, And includes a rotor 122.

The stator 121 may be provided with annular electromagnets arranged to generate magnetic force, and the rotor 122 may be provided with a plurality of annularly disposed permanent magnets. The rotor 122 is coupled to the pump case 132 of the pump module 130, which will be described later.

The stator 121 can be supplied with electricity through the power supply, and the rotor 122 can be rotated by the generated electromagnetic force. The rotor 122 and the stator 121 may be provided in the same structure as a conventional BLDC motor.

4 to 8, the pump module 130 includes a pump case 132, a barrel cylinder portion 133, a pump piston 140, a cylindrical slope block 145, a central shaft portion 148, 136).

The pump case 132 is coupled to the rotor 122 and is rotatably coupled to the motor pump housing 110. The pump case 132 is a cylindrical member having both sides opened and is coupled to a barrel cylinder portion 133 disposed therein, and can receive the driving force to rotate the barrel cylinder portion 133.

The barrel cylinder portion 133 is disposed inside the pump case 132 and the pump cylinders that provide a pumping space in which the pump piston 140 is operable are disposed at intervals along the circumferential direction. The pump cylinder is barrel shaped into a piston disposition space.

In this barrel cylinder part 133, eight pump cylinders are disposed in an annular shape, and a pump piston 140 is disposed therein. The piston swash plate 131 is disposed on one side of the barrel cylinder portion 133 and the opening block 136 is disposed on the other side.

The barrel cylinder portion 133 includes a barrel member 134 in which the pump cylinder is configured, a space member 135 that is annularly disposed on the outer wall portion of the barrel member 134 and fixes the barrel member 134 to the pump case 132, . ≪ / RTI >

The pump cylinder is substantially provided with a passage in the barrel member 134, and is arranged in an annular shape. The pump cylinder is formed as a passage at the central outline along the longitudinal direction of the barrel member 134 so that the piston member described later of the pump piston 140 can be disposed.

Inside the pump cylinder, a piston member 141 which is a part of a pump piston 140 configured to reciprocate in a swash plate manner and suck and discharge the fluid is disposed. The pump piston 140 is disposed in an annular shape, and reciprocates and reciprocates in the piston to suck the fluid to the pump cylinder side and discharge the fluid.

The pump piston 140 includes a piston member 141 movably disposed in the pump cylinder, a spherical spin member 142 connected to the piston member 141, and a ring member 142 connected to the spherical spin member 142 to be annularly disposed And a spin joint member 143 which is made of a metal.

The piston member 141 is spin-coupled to the spin joint member 143 by a spherical spin member 142 and the spin joint member 143 is connected to the piston swash plate 131. The piston swash plate 131 is brought into contact with the inclined surface of the cylindrical inclined block 145 and driven by the motor module 120 to draw the fluid toward the pump cylinder side by the piston member 141, And is discharged.

Suction and discharge of the fluid by the pump piston 140 are convexly contacted to the barrel member 134 and connected to the opening block 136 inserted into the pump case 132 side. The aperture block 136 is described below.

The cylindrical inclined block 145 is provided with an inclined portion 146 to which the piston swash plate 131 contacts and is coupled to the motor pump housing 110. The cylindrical inclined block 145 is provided with an inclined portion 146 inclined to be in contact with the piston swash plate 131 so that the pump piston 140 connected to the swash plate 131 to be rotated is reciprocated in the pump cylinder portion have. The cylinder slope block 145 is rotatably coupled to the central shaft portion 148. The cylindrical inclined block 145 is fixed to the motor pump housing 110 by the engaging member 149 positioned up and down as a bent shape.

 The center shaft portion 148 is disposed inside the cylindrical inclined block 145 so as to be relatively rotatable therewith. The center shaft portion 148 is coupled to the barrel cylinder portion 133 and is rotatably coupled to the motor pump housing 110. One end of the center shaft portion 148 is rotatably coupled to the motor pump housing 110 and the other end portion of the center shaft portion 148 is rotatably coupled to the center portion of the opening block 136 .

On the other hand, a spring is disposed on the central shaft portion 148. The spring is disposed in the central portion of the barrel cylinder portion 133 and extends in the axial direction corresponding to the relative movement of the barrel cylinder portion 133 and the central shaft portion 148 when the barrel cylinder portion 133 and the central shaft portion 148 rotate The impact applied can be buffered. The spring may be supported by a snap ring disposed on the end side of the barrel member 134 while surrounding the central shaft portion 148 in a coil shape.

A bearing 138 is disposed on the central shaft portion 148. The bearing 138 is located inside the cylindrical slope block 145 by a large snap ring and a small snap ring. A cylindrical bearing 138 is disposed in a portion of the central shaft portion 148 that is disposed in the opening block 136 and has a rotating structure.

The opening block 136 is coupled to the motor pump housing 110 on the opposite side of the cylindrical inclined block 145 and a plurality of openings 137 are partitioned and arranged in pairs. The opening block 136 is rotatably inserted into the central shaft portion 148 at a central portion thereof.

The opening block 136 is formed in a convex shape in the opening 137 so that the opening block 136 is brought into a convex spin contact with the barrel cylinder portion 133 and the barrel member 134 can have a concave shape corresponding to the opening block 136 .

One of the opening blocks 136 has a pair of connecting passages in which the input / output ports 191 and 192 are connected one by one. The pair of connecting passages are connected to the pump cylinder side of the barrel member 134, Lt; / RTI >

Further, the opening block 136 is provided with a drain passage connected to a drain port 194 to be described later. O-rings for sealing the connection structure are arranged in the pair of connection and drain passages.

9 to 15, the pump manifold 150 is fixed to the motor pump housing 110 with a plurality of fastening bolts, and fluid passages for guiding the fluid toward the opening block 136 are provided inside will be.

The pump manifold 150 is provided with an initial boosting pressure that allows fluid to flow into and out of the pump cylinder side where the pump piston 140 of the pump module 130 driven by the motor module 120 is disposed, A line that drains the fluid leakage due to the excessive pressure generated in the inside of the cylinder, circulates the drain fluid back to the opening block 136 side, or sends the surplus fluid and drain fluid back to the pump cylinder side according to the boosting pressure, And valves for fluid control in the lines.

In this pump manifold 150, a main hydraulic circuit for operating the pump module 130 is constructed. The lines of the hydraulic circuit are provided with pipelines, the valves consist of a check valve, a relief valve and a pilot check valve.

In the pump manifold 150, pipelines are formed corresponding to the hydraulic circuit, and a plurality of ports for supplying and discharging the working fluid are fixed. The plurality of ports may include a plurality of input / output ports 191, 192, a boosting port 193, and a drain port 194.

9 to 15, the hydraulic circuit of the pump manifold 150 includes a first line 151 and a second line 152 connected to the plurality of openings 137 in the pump module 130, The relief valves 155 and 156 of the first line 151 and the second line 152 and the plurality of pilot check valves 157 and 158, the boosting line 170, the plurality of check valves 173 and 174, A plurality of pilot check valves 181 and 182 and a relief valve 177, input / output ports 191 and 192, a boosting port 193 and a drain port 194 of the drain line 175, And pressure sensors 195 and 196 in the line 151 and the second line 152, respectively.

The first line 151 and the second line 152 may be selectively used as a fluid inflow line and an outflow line for the pump module 130, respectively, depending on the operating direction of the pump module. The first and second lines 151 and 152 may be connected to the upper and lower ends of the actuating cylinder, which is an actuator operated by the hydraulic pressure of the pump module 130, respectively.

The first and second lines 151 and 152 are connected to a boosting line 170 which provides an initial boosting pressure. The boosting line 170 is initially capable of providing a starting pressure and flow rate of fluid to the pump cylinder side of the pump module 130.

The boosting line 170 is connected to the first and second lines 151 and 152 and the plurality of check valves 174 and 174 are disposed in the first connection line 171. The plurality of check valves 174 and 174 may be opened by the hydraulic pressure of the boosting line 170 to allow fluid to flow from the boosting line 170 side to the first and second line sides.

The first check valve 173 is adjacent to the first line 151 side of the plurality of check valves and the second check valve 174 adjacent to the second line 152 side is defined by the second check valve 173, . These first and second check valves are disposed in the first connection line 171.

The first and second lines 151 and 152 are connected by a plurality of parallel lines 153 and 154, respectively. The plurality of parallel lines 153 and 154 may be provided with relief valves 155 and 156 for passing a working fluid having a predetermined pressure or higher.

The relief valves 155 and 156 are connected to the relief valves 155 and 156 so that the fluid flows from one of the first and second lines 151 and 152 to the other line, Can be provided. So that some fluid can be circulated to the pump module 130 side without being supplied to the operation cylinder at a set pressure or more.

A first pilot check valve 157 is disposed at the end of the first line 151 and a second pilot check valve 158 is disposed at the end of the second line 152. The first and second pilot check valves 157 and 158 include a first pressure compensation line 161 connected to the second pilot check valve 158 in the first line 151 and a second pressure compensation line 161 connected to the second line check valve 158. [ And are connected to each other by a second pressure compensation line 162 connected to the first pilot check valve 157.

The first pilot check valve 157 allows the supply of fluid to the operating cylinder side when the open pressure is provided in the pressure compensated state by the second pressure compensation line 162 and the second pilot check valve 158 , An open pressure is provided in the pressure-compensated state by the first pressure compensation line 161, and the fluid supply to the working cylinder side is allowed.

The drain line 175 is connected to the pump module 130 and the first and second lines 151 and 152. A drain junction line 176 connecting the boosting line 170 to the drain line 175 is connected to the rear end of the drain line 175.

The drain line 175 and the first and second lines 151 and 152 are connected by a second connection line 179. A third pilot check valve 181 is disposed on the first line 151 side and a fourth pilot check valve 182 is disposed on the second line 152 side in the second connection line 179.

The third pilot check valve 181 and the fourth pilot check valve 182 may allow fluid to flow toward the first line 151 and the second line 152 side on the side of the drain confluence line 176 . Some of the fluid sent to the drain port 194 through the drain line 175 flows through the drain junction line 176 to one or both of the first and second lines 151 and 152.

The pressure sensors 195 and 196 are respectively connected to the first and second lines 151 and 152 to measure the flow pressures of the first and second lines 151 and 152, respectively. These pressure sensors 195 and 196 are threadedly coupled to the sides of the pump manifold 150 to permit the hydraulic pressure of each of the first and second lines 151 and 152.

In the figure, '198' is connected to the first and second connection lines, respectively, and is connected to one input / output port 192. This is the inspection bolt for the up and down line inspection.

Reference numeral 199 denotes a check bolt for inspecting the first and second connection lines, the pilot check valve, and the check valve.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Deletion, addition or the like of the present invention may be variously modified and changed within the scope of the present invention.

110: motor pump housing 111: first housing
112: second housing 120: motor module
121: stator 122: rotor
130: Pump module 131: Piston swash plate
132: pump case 133: barrel cylinder part
134: Barrel member 135: Space member
136: opening block 137: opening
138: Bearing 139: Spring
140: pump piston 141: piston member
142: spherical spin member 143: spin coupling member
145: cylinder inclined block 146: inclined portion
148: center shaft portion 149: cylindrical fixing member
150: pump manifold 151: first line
152: second line 153, 154: parallel line
155: first relief valve 156: second relief valve
157: first pilot check valve 158: second pilot check valve
161: first pressure compensation line 162: second pressure compensation line
170: boosting line 171: first connecting line
173: first check valve 174: second check valve
175: drain line 176: drain junction line
177: third relief valve 179: second connection line
181: Third pilot check valve 182: Fourth pilot check valve
191, 192: I / O port 193: Boosting port
194: drain port 195, 196: pressure sensor

Claims (12)

Motor pump housing;
A motor module disposed annularly within the motor pump housing;
An opening provided inside the motor module to be driven by the motor module and providing a plurality of openings used as one of an inlet and an outlet, and a piston swash plate and a pump A pump module comprising a piston; And
And a pump manifold coupled to the motor pump housing, the pump manifold including a hydraulic circuit for operating the operation object by the working fluid of the pump module,
The motor module includes:
A stator fixed in an annular shape on an inner wall of the motor pump housing; And
A rotor rotatably disposed within the stator and coupled to the pump module,
The pump module includes:
A pump case coupled to the rotor and rotatably coupled to the motor pump housing;
A pump cylinder disposed within the pump case and providing a pumping space in which the pump piston is operable, the pump cylinder being disposed at intervals along the circumferential direction;
A cylindrical inclined block provided on the inclined portion to which the piston swash plate is contacted and coupled to the motor pump housing; And
And a center shaft portion rotatably connected to the cylinder block portion and rotatably coupled to the motor pump housing. The motor-driven hydraulic pump according to claim 1, delete The method according to claim 1,
The pump piston includes:
A piston member movably disposed in the pump cylinder;
A spherical spin member connected to the piston member; And
And a spin joint member connected to the spherical spin member and annularly disposed on the swash plate. The method of claim 3,
The barrel cylinder portion includes:
A barrel member in which the pump cylinder is configured; And
And a space member that is annularly disposed on an outer wall portion of the barrel member and fixes the barrel member to the pump case. 5. The method of claim 4,
The pump module further includes an opening block coupled to the motor pump housing on the opposite side of the cylindrical inclined block and having the plurality of openings defined therein and arranged in pairs, the center shaft portion being rotatably inserted into and coupled with the center portion Motorized electric hydraulic pump. 6. The method of claim 5,
Wherein the opening block is provided in a convex shape so that the opening portion is brought into a convex spin contact with the barrel cylinder portion, and the barrel member has a concave shape corresponding to the opening block. The method according to claim 1,
The hydraulic circuit of the pump manifold includes:
A first line connected to any one of the plurality of openings;
A second line connected to the other of the plurality of openings;
A boosting line connected to the first and second lines and providing an initial boosting pressure;
A plurality of check valves disposed in a first connection line connecting the boosting line and the first and second lines;
A drain line connected to the pump module and the first and second lines; And
And a drain coupling line connecting the boosting line to the drain line. 8. The method of claim 7,
The first and second lines are connected by a plurality of parallel lines,
Wherein a relief valve is disposed in each of the plurality of parallel lines and the drain confluence line to allow a working fluid of a set pressure or more to pass therethrough. 9. The method of claim 8,
The hydraulic circuit includes:
A first pilot check valve disposed at an end of the first line;
A second pilot check valve disposed at an end of the second line;
A first pressure compensation line connected to the second pilot check valve in the first line; And
And a second pressure compensation line connected to the first pilot check valve in the second line. 9. The method of claim 8,
The hydraulic circuit includes:
A second connection line connecting the drain line and the first and second lines;
A third pilot check valve disposed on the first line side in the second connection line; And
And a fourth pilot check valve disposed on the second line side of the second connection line. 11. The method according to any one of claims 7 to 10,
The pump manifold is provided with pipelines corresponding to the hydraulic circuit, and a plurality of ports for supplying and discharging the working fluid are fixed,
Wherein the plurality of ports include a plurality of input / output ports, a boosting port, and a drain port. 11. The method according to any one of claims 7 to 10,
Wherein the hydraulic circuit further comprises a pressure sensor which is connected to the first and second lines and which is disposed in the pump manifold.

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