WO2005024246A1

WO2005024246A1 - Working machine driving unit

Info

Publication number: WO2005024246A1
Application number: PCT/JP2004/003220
Authority: WO
Inventors: Masatoshi Miki; Nobuaki Matoba
Original assignee: Shin Caterpillar Mitsubishi Ltd.
Priority date: 2003-09-01
Filing date: 2004-03-11
Publication date: 2005-03-17
Also published as: JP2005076781A

Abstract

Installed for a boom cylinder (3a) is a first closed circuit (A) for controlling the operating speed of the boom cylinder (3a) connected to an oil pressure pump (21), through swash plate control of the oil pressure pump (21). Installed for an arm cylinder (4a) is a second closed circuit (B) for controlling the operating speed of the arm cylinder (4a) connected to an oil pressure pump (22), by swash plate control of the oil pressure pump (22). Installed for a bucket cylinder (5a) is an open circuit (C) for controlling the operating speed of a bucket cylinder (5a) connected to a control valve (35), by swash plate control of an oil pressure pump (23) and by flow rate control by the control valve (35) for controlling the working oil supplied from the oil pressure pump (23). From the control valve (35) on the pump side of the open circuit (C) branches off a distribution circuit (D) for distributing working oil from the oil pressure pump (23) to the boom cylinder (3a) and arm cylinder (4a). Optimum power can be supplied according to load.

Description

Work machine

Business technology

The present invention relates to the drive of a working machine such as a hydraulic shovel.

Technique

Fig. 3 is a diagram of the structure of the hydraulic shovel as a working machine. Fig. 4 is a conventional document that operates the hydraulic shovel.

FIG. 2 is a circuit diagram showing a configuration of the hydraulic system of FIG. In FIG. 3, the upper revolving structure 2 is rotatably rotatably mounted on the lower traveling structure 1, and is swingably mounted on the upper revolving structure 2 and the upper revolving structure 2. One boom 3 operated by the cylinder a, and a boom mounted on the tip of the boom 3 in an automatic white space and operated by the arm cylinder 4a

And a working device 6 in which a bucket 5 attached to the tip of the arm 4 and operated by a socket cylinder 5a is sequentially connected. As shown in FIG. 4, the conventional hydraulic system is

ヽ, the engine 7 mounted on the upper revolving superstructure 2 and the engine

7 has swash plate control devices 8a and 9a driven by 7

'Variable displacement hydraulic pump 8J9, pie port pump 10 for supplying the pilot pressure, and hydraulic pump 8 9 pressure oil between the co emissions collected by filtration Renault Lube 1 1 Nono ⁰ I Tsu preparative-operated order to you allocated to A Cu Chi Yu et motor, co down WINCH one Honoré carbonochloridate Honoré off ,, 1 The operation valve for controlling the nozzle 1 to the knock control (hereinafter, the operation valve is called "remote control valve") 1 2 and the rotation speed of the fan 7 Set engine time 5 R / h = ^

13 and a controller 7 for controlling the output of the pump 7 and the hydraulic pump 89, and a boom cylinder 3a for driving the working device 6 and the arm. Cylinder 4a, Note Cylinder

5 a and 油圧 Hydraulic motor for turning upper revolving superstructure 2

15 and a traveling hydraulic motor 16 a, 16 b for driving the lower traveling body 1.

In FIG. 4, the remote valve 12 is operated to switch the control valve 11 and is driven by the fan 7 and the fan 7. In a conventional system in which the hydraulic oil of the hydraulic pumps 8 and 9 is distributed to each actuator and the work machine is operated, the hydraulic pump 11 is used to control the hydraulic pump. By squeezing out the discharge pressure oil of 8 and 9, each of the actuating units such as the boom cylinder V adam cylinder 4a and the socket cylinder 5a Due to the distribution to the data, the throttle loss at the control knob 11 is large, which is disadvantageous in terms of fuel consumption and production costs.

In addition, a plurality of actuators such as a bumper cylinder 3a, an arm cylinder V4a, and a socket cylinder 5a are connected in series.

The operation is difficult, and the load interferes with the operation. The operation is difficult and there is a problem with the operation. The engine is driven by the engine as the power source of the hydraulic shovel, and the hydraulic pump is driven, and the hydraulic pump is = 1 in. Connect the damper cylinder via the valve and connect the generator cylinder to the generator via the inverter. When the load on the hydraulic pump side is low, the electric energy generated by the generator can be stored in the ΛV te, and when the load on the hydraulic pump side is high, The power and electric power generated by the battery was used to drive the generator as an electric motor, and the torque was applied to a hydraulic pump to provide a pump and a pump. In addition to ensuring good operability of the system, there is also a need to save energy (for example,

(See No. 704) c

In this way, the hydraulic pressure of the hydraulic pump, which is driven by the engine, is distributed to the plurality of hydraulic actuators by operating the n-type lubricator. In the conventional system, the hydraulic oil of the hydraulic pump is squeezed at the inlet port and is distributed to each actuator. According to the company, several hydraulic actuators are linked to each other, because problems such as reduction of fuel consumption and noise are considered. Field P ヽ There is a problem that the operation is difficult due to significant load interference.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a drive device for a work machine capable of supplying an optimum power according to a load. It is what it is. Opening of the invention

The driving machine of the working machine of the present invention is a hydraulic pressure pump that is provided with a fluid pressure pump that performs variable displacement control of a fluid pressure pump that is regulated by a variable capacity means. The closed circuit for controlling the operation speed of the tuner and the variable capacity means for regulating the flow of the fluid pressure pump in this closed circuit are different from the variable capacity means. Control of the capacity of the fluid pump to be adjusted and the control of the working fluid supplied from the fluid pump. One inlet and one outlet. -The fluid connected to the controller by the flow control by the non-snorp installed in parallel with the no-re-no-rep. The pressure actuator The hydraulic fluid in the open circuit and the circuit that controls the operating speed of the pump The hydraulic fluid in the pump is closed And a distribution circuit for distributing the fluid to the cut-out circuit, and the fluid pressure of the closed circuit is controlled by the variable capacity control of the fluid pressure pump in the closed circuit. Since a static pressure drive system that controls the speed of the actuator is used, there is a significant reduction in throttling due to the use of the system's π-one contact knob. In addition, since the brake power of the closed-circuit fluid pressure actuator is operated by the load, the energy efficiency can be greatly improved. In addition, the amount of heat generated by the working fluid due to throttling loss is smaller than that of the conventional system, so that the cooling device can be downsized. Open circuit fluid pressure pump Can be distributed to the body pressure actuator in the closed circuit. ヽ The fluid pressure pump in the closed circuit can be reduced in size, and the pump clothing can be used. Easy to do, lower cost

· When multiple fluid pressure actuators are operated in conjunction with each other α, the fluid pressure actuator for each circuit is unique. The pump can be driven by the body pressure pump, and the working fluid is distributed from the body pressure pump to the closed circuit fluid body as needed.分分干渉干渉干渉干渉干渉干渉干渉干渉干渉干渉干渉干渉分分分分干渉分分分分分干渉分干渉干渉干渉干渉干渉干渉.

The drive device of the work machine according to the present invention includes a boom operated by a boom cylinder, a boom operated by a boom cylinder, and a vehicular cylinder. In a working machine equipped with a working device in which a socket operated by a head cylinder is sequentially connected to a socket, and

, The first variable capacity • The variable capacity control of the first fluid pressure pump whose flow rate is adjusted by S

, _, The first closing circuit for controlling the operating speed of the boom cylinder connected to the first fluid pressure pump is different from the first variable variable means described above. The second fluid pressure pump, whose flow rate is adjusted by the second fluid volume control means, is in contact with this second fluid pressure pump by the variable capacity control of the fluid pressure pump. A second closed circuit for controlling the operating speed of the obtained arm cylinder; and a third capacity variable means different from the above first and second capacity variable means. Variable capacity control of the third fluid pressure pump whose flow rate is regulated by the third fluid pressure pump and supplied from this third fluid pressure pump The control of the supplied working fluid is achieved by the control of the flow rate by means of a flow control by means of a pipe snub which is placed in parallel with this control. An Is circuit that controls the operating speed of the non-contact cylinder that is in contact with the unit, and the operation of the third fluid pressure pump in the circuit And a distribution circuit for distributing the fluid to the boom cylinder.

From the hydraulic pump No. 1 ぴ The second hydraulic pump uses a hydrostatic drive ft system, which controls the operating speed of the boom cylinder pump cylinder with variable control. Since it is used, the loss of a squeezer due to the conventional system's control port can be greatly reduced, and it is also possible to use a B Since the brake power can be recovered when the cylinder is operated ft by the load, the energy efficiency can be greatly improved. As compared with the above, the heat generated by the working fluid is reduced due to the throttle V loss, so that the cooling device can be miniaturized and the second cylinder cylinder can be used.

Distributing the flow rate of the fluid pressure pump of (3) to the Bumper Vinder Cylinder can be done easily. The first fluid pressure pump for the V-cushion よ The second body pressure pump can be downsized, these pumps can be easily removed, and the pump can be lowered. When operating the Bum Cylinder, Am C V Cinder and Kect C V, the cylinder for each circuit is independent It can be moved by a hydraulic pump. And it is necessary to distribute the working fluid from the third fluid pressure pump for the nozzle cylinder to the Bumushi V damper cylinder. Therefore, compared to the conventional system, it is possible to reduce the load interference and improve the operability.

Book ,,,

The drive garment of the work machine of the present invention is an electric motor that has both functions of a motor and a generator, which is separated by the drive unit of the engine. • The surplus power of the generator and the engine • Electricity generated by the generator and electric power generated by the power of the Boom Vinder and the bumper cylinder • Electricity generated by the generator When the battery is charged to the battery V and the output of the engine is insufficient, the electric motor is driven by the electric power discharged from the battery. It is equipped with a charge / discharge circuit for assisting power, and when the Boom V and the A / C cylinder are operated by a load. Electric power is used for the electric power. • The power recovered by the power generation action of the generator and the power generated when the load is low • The surplus power generated by the power generator is Fill the charging / discharging circuit

On the other hand, when the load is high, the generator output is smoothed by driving the generator with the electric power released from the knockout, so the engine output can be smoothed. By comparing the size of the engine, _ and,

The drive of the work machine of the present invention is

·-

/ M is controlled by

i Adjust the flow rate of the fluid pressure pump that is in contact with the A closed circuit that controls the operating speed of the body pressure actuator that is operated, and a motor that is different from the above motor that adjusts the flow rate of the fluid pressure pump in the closed circuit of the motor. By controlling the speed, the rotation speed of the fluid pressure pump connected to this motor is controlled, and the rotation speed of the fluid pressure pump is also supplied from this fluid pressure pump. The working fluid is controlled by a BX-mounted no-pass tube in parallel with the control valve and the control valve. Opening circuit that controls the operating speed of the fluid pressure actuator connected to the valve and the operation of the fluid pressure pump in this circuit And a distribution circuit for distributing the fluid to the fluid pressure actuator of the closed circuit. By controlling the rotation speed of the fluid pressure pump to control the fluid pressure actuator in the closed circuit, the speed of the conventional system is reduced. Squeeze with one renole. This greatly reduces the loss and recovers the braking force when the fluid pressure actuator in the closed circuit is activated by the load. In addition, the energy efficiency has been greatly improved and the system has been narrowed down compared to conventional systems. Since the working fluid generates less heat, the cooling device can be downsized and the flow rate of the hydraulic pump in the circuit closed.

·-Distributing to the fluid pressure actuators on the road can be easily performed. ヽ The fluid pressure pump in the closed circuit can be reduced in size, and the pump can be mounted easily. If the stake is lowered, the stake can be reduced. ヽ Multiple fluid pressure functions The fluid pressure actuator of each circuit can be driven by a unique fluid pressure pump, and the fluid pressure of the open circuit can be changed as needed. Since pressure oil is supplied from the pump to the fluid pressure actuator in the closed circuit, load interference is reduced as compared with the conventional system. Then, the interlocking operation can be easily performed.

The drive of the work machine according to the present invention includes a boom operated by a boom cylinder, a boom operated by a boom cylinder, and a dynamo. In a work machine provided with a work station in which buckets operated by a bucket cylinder are sequentially connected, the rotation speed of the first motor is controlled. The flow rate of the first hydraulic pump in contact with the first motor is adjusted to P, and the flow rate of the first hydraulic pump is adjusted to P, so that the pump is in contact with the first hydraulic pump. A first closed circuit for controlling the operating speed of the motor, and a second motor connected to the second motor for controlling the rotation speed of a second motor different from the first motor. By adjusting the flow rate of the second hydraulic pump, the operating speed of the amp cylinder connected to this second hydraulic pump is adjusted. The second closed circuit to be controlled is connected to the third motor by controlling the speed of rotation of a third motor different from the first motor and the second motor. The rotation speed of the third hydraulic pump is controlled and provided from the third hydraulic pump.

'The working fluid is supplied to the control valve and the HX-mounted diaper valve in parallel with the control valve. 0 Open circuit that controls the operation speed of the bucket cylinder, which is controlled by the inlet ¹ to the knurl, and the hydraulic pump of the whistle 3 of this circuit. And a distributing circuit for distributing the working fluid of the first embodiment to the bobbin cylinder. From the pump ぴ Since the operating speed of the bumper and the amp V-Vinder is controlled by controlling the rotational speed of the second fluid pressure pump, the conventional system This significantly reduces the throttle loss caused by the unit's control and reduces the number of throttles that can be actuated by the load. Recovering the power of the power greatly improves the energy efficiency.o Compared with the conventional system, the working fluid of the working fluid Since the heat generation is small, the cooling unit can be downsized.In addition, the flow rate of the third fluid pressure pump for the packet cylinder is controlled by the The first fluid pressure pin for the bumper cylinder and for the damper is allocated to the V and V cylinders. The electric motor and the second hydraulic pump are smaller than the second hydraulic pump. These pumps make the motor easier and lower the cost. If the Boom Cinder, Arm Cylinder, and Voke V Cinder are operated dynamically, the cylinder for each circuit will be used independently. It can be driven by a hydraulic pump and, if necessary, from a third hydraulic pump for the nozzle cylinder to a boom cylinder and an amm cylinder. Pressure Since oil is supplied, load interference is reduced compared to the conventional system. ヽ Interlocking operation can be facilitated.

The drive of the work machine of the present invention is a small number of the first lightning thrusters. The second motor has the function of a motor and is driven by an engine to be driven by the first motor. A generator that supplies power to the second and third motors, the surplus power from the generators and the brake power of the Bumshinda and Amushinda The generator of the machine

It has a first electric motor having a blindfold and a charge / discharge circuit for charging / discharging the electric power generated by the second electric motor to a battery. In addition, the generator generates a braking force that indicates that the binder or the amplifier has been actuated by a load. The power recovered by the action or the surplus power generated at low load is charged to the battery V of the charging / discharging circuit, and the power is supplied from the battery at high load. Since the engine output is smoothed, it is possible to reduce the size of the engine as compared to the conventional system, and to reduce the engine output. Brief Description of Drawings

FIG. 1 is a hydraulic circuit diagram showing an embodiment of a drive device for a work machine according to the present invention, and FIG. 2 is another embodiment of a drive device for a work machine according to the present invention. FIG. 3 is a hydraulic circuit diagram showing the configuration of the hydraulic machine as a working machine. FIG. 4 is a side view showing the a-shavel, and FIG. 4 is a hydraulic circuit diagram showing a hydraulic system for operating the conventional hydraulic shovel. The best mode for carrying out the invention is shown in FIG.

Hereinafter, the driving device of the work machine according to the present invention will be described in detail with reference to one embodiment shown in FIG. 1 and another embodiment shown in FIG. explain .ヽ For the work machine, refer to the hydraulic shovel shown in Fig. 3.

First, the system configuration of the drive system shown in FIG. 1 will not be described. The system configuration of _ will be described with reference to the hydraulic system shown in FIG. Only the driving mechanism 15 of the working device 6 is shown at the bell, and the traveling system actuator of the other lower traveling unit 1 and the swivel system actuator of the upper revolving unit '2 are shown. Do not omit the light.

1 In the figure, a power transmission device 20 for distributing the power of the engine 7 is connected to the engine 7 which is a power source, and the power transmission device 20 is connected to the power transmission device 20. Bi-tilt type variable displacement as first fluid pressure pump for driving a boom cylinder όa as first fluid pressure actuator Hydraulic pump 21 and a second hydraulic pump for driving the damper cylinder 4a as a second hydraulic pressure actuator. Double tilt type variable displacement hydraulic pressure The third pump 22 and the one-sided tilt as the third fluid pressure pump for driving the packet cylinder 5a as the third fluid pressure actuator A hydraulic variable pressure pump 23 of a rollable variable displacement type is mounted on each.

These first, second and third hydraulic pumps 21,

22 23 include the first and second needles and the first, second and third swash plate control devices 21a for controlling the tilt angle of the swash plate as the third capacity variable means. , 22a,, 23a Force S Each of the hydraulic pumps 23 has a first and a second hydraulic pump 24 to which a charge pump 24 is connected. The pump 2122 pumps the excess oil out of the hydraulic oil as a working fluid that also functions as a hydraulic motor when it receives the supply of hydraulic oil.

The flushing valve 25 for discharging to the 42, the low-pressure reflex valve 26 for holding the low-pressure side pressure, and the cylinder dropping operation Electromagnetic switching valves 27a and 27b for prevention, check valve 28 for prevention of vacuum, and

バ The vane valve 45 mounted on the boom cylinder 3a is constituted by the valve and the leaf valve 29a, 29b.

The knockout unit 46 provided on the drum cylinder 4a has the same flame V-single as the knockout unit 45 on the bumper cylinder 3a. According to the knob 30, the low-pressure relief valve 31, the electromagnetic switching valves 32 a, 32 b, the check valve 33 for preventing the load, and the one-piece relief valves 34 a, 34 b. Is configured 4 and the first closed circuit to the boom cylinder 3a.

A is placed in P position. The first closed circuit A adjusts the flow rate by the first swash plate control device 21a, that is, the hydraulic pump in the swash plate control of the hydraulic pump 21 that is variably controlled. It controls the operation speed of the Poom cylinder 3a connected to the pump 21.

Similarly, the second closed circuit to the arm cylinder 4a

B is lost. This second closed circuit B is controlled by a swash plate control of a hydraulic pump 22 whose flow rate is adjusted by a second swash plate control device 22 a, that is, a variable displacement control. It controls the operation speed of the arm cylinder 4a connected to the pump 22.

Further, an open circuit C is provided for the Ket cylinder 5a. The open circuit C is controlled by a third swash plate control device 23 a to adjust the flow rate, that is, to control the swash plate of the hydraulic pump 23 whose capacity is variably controlled, and the hydraulic pump 23. 2 3 Control device for controlling hydraulic oil supplied from 3 to 3 5 and the BX in parallel with this control port The flow rate control by the knob 62 controls the operating speed of the bucket V to V5a connected to the control knob 35.

To control the socket cylinder 5a, use the open circuit C to control the cylinder 5a.

The hydraulic pressure of the hydraulic pump 23 is distributed to the bumper V3a and the arm cylinder 4a from the pump side force. 5 The circuit -D is branched, and the check valves 36 and 38 and the hydraulic oil of the hydraulic pump 23 are supplied to the distribution circuit D of the

Magnetic proportional changeover valve 37 for supplying to 3a and + magnetic proportional changeover valve 39 for supplying the hydraulic oil of hydraulic pump 23 to damper cylinder 4a are provided 1 It has been.

The discharge line of the charge pump 24 includes a charge switch valve 40 for supplying the pressure oil of the charge pump 24 to the low pressure line. The suction P of the hydraulic pump 23 and the charge pump 24 that is separated from the BX by the BX is connected to the tank 42 _{c c} )

The power transmission device 20 as a drive unit of the engine 7 includes a motor and a generator.

Electric-generator with eyebrows

63 are set ''

A notch 65 is connected to the motor / generator 63 via an inverter / inverter 64, and the motor / generator 63 is connected to the motor / generator 63.

Filling V te V 65 •

I Discharge i-flow control is performed.

Those inno

V 65 constitutes a charging / discharging circuit F, and the surplus power of the engine 7 at the time of light or negative is converted to electric power by the generator 63 which functions as a generator. In addition, the brake power of the pump V 3a and the pump 4a is converted to electric power by a power generator 63 that functions as a generator, and These electric powers are controlled by the inter- ter / 64 to charge the battery 65. On the other hand, when the power of the engine 7 is insufficient, the electric power controlled by the discharge control of the battery 65 from the invertor / con- nector 64 is supplied to the motor. The electric power is supplied to the electric machine 63 to drive the electric power of the engine 7 by driving the electric motor 63 as an electric motor.

Next, the operation of the embodiment shown in FIG. 1 will be described.

(1) When not operating

In FIG. 1, when not operated, the hydraulic pumps 21, 22,

23 is controlled to the minimum tilt angle, and the solenoid-operated switching valves 27 a, 27 b,

32a, 32b ぴ The control valve 35 is completely closed, the noise bar / reve 62 is opened, and the Boom cylinder • 3a, V alm cylinder 4a and bucket V cylinder

5a is held in a stopped state.

(2) Actuator and data alone

When the boom cylinder 3a is independently operated to the extension side, the swash plate control device 21a raises the swash plate of the hydraulic pump 21, and at the same time, the electromagnetic force is increased. Switching valves 27a and 27b are opened.

■ The pressure oil of the hydraulic pump 21 is supplied from the solenoid-operated switching valve 27b to the bottom chamber of the boom cylinder 3a, and the other side of the rod chamber of the boom cylinder 3a. The hydraulic oil is returned to the hydraulic pump 21 from the electromagnetic switching valve 27a.

At the time of, the return chamber oil from the mouth chamber of the boom cylinder 3a is supplied from the hydraulic pump 21 to the bottom chamber of the boom cylinder 3a. Is less than the amount of oil to be returned. The shortage is supplied from the charge pump 24 to the hydraulic pump 21 through the check valve 40 for the chassis.

In order to further increase the elongation speed of the bom cylinder 3a, when the swash plate of the hydraulic pump 23 is raised, the bypass / lube 62 By closing the solenoid valve and controlling the opening P of the electromagnetic ratio changeover valve 37, the hydraulic oil of the hydraulic

3 Replenish the bottom room.

When the cylinder 3a is independently operated on the compression side, the swash plate of the hydraulic pump 21 is controlled in the opposite direction to the above-described stretching operation.

At this time, since the bomb chamber of the boom cylinder 3a is under pressure, the hydraulic pump 21 acts as a motor, and the braking force is reduced. The engine 7 is absorbed by the other hydraulic pumps via the power transmission device 20.

The amount of oil returning from the bottom chamber of the cylinder 3a to the hydraulic pump 21 is supplied to the rod chamber.

The excess oil is returned to the tank 42 from the flushing knob 25 because it is greater than the oil to be washed.

The stretching action of the film cylinder 4a is also possible.

3a is performed by the same action.

When the retractable cylinder 5a is extended and retracted, the swash plate of the hydraulic pump 23 is raised, and at the same time, the hydraulic pump 62 is closed. The a P of the control knob 35 is controlled, the hydraulic pressure is supplied to the bucket cylinder 5a, and the expansion / contraction operation is performed. (3) Actuator linked operation

When the cylinder 3a, the cylinder 4a and the packet cylinder 5a are operated in conjunction with each other, the hydraulic cylinder is a hydraulic cylinder. The pump 21 and the arm cylinder 4a are driven by the hydraulic pump 22, and the bucket cylinder 5a is driven by the hydraulic pump 23-£).

However, the boom cylinder ύa and the arm cylinder

4 If a requires more than the hydraulic pumps 21 and 22 to supply and supply, the electromagnetic ratio will depend on the cylinder's Leno action. Example: The opening P of the switching valves 37 and 39 is controlled. 圧 The hydraulic oil of the hydraulic pressure pump 23 is supplied to the boom cylinder.

It is replenished to 4a and controlled so as to obtain a cylinder speed corresponding to the lever operation.

When the bum cylinder 3a is independently operated on the compression side, the hydraulic pump 21 acts as a motor and drives the electric / generator 63 via the power transmission 20. The motor 63 converts the brake power of the pump cylinder 3a into electric power, and converts the power through the inverter / con- nector 64. To charge the battery 65.

In addition to the bumper cylinder 4a, the bumper cylinder 3a

Converts brake power to electric power and charges the battery 65 | pj

Next, the effect of the embodiment shown in FIG. 1 will be described.

'explain

Hydraulic pumps 21 and 22 of the closed circuits A and B 9 Musi y 3a よ The work of the arm shiny 4a »Since it is used for the B-in pressure drive system that controls the ¾ 、 The squeezing loss caused by the knuckle is greatly reduced, and the boom cylinder 3a of the closed circuit A is operated by the load. When the cylinder is contracted, the arm of the closed circuit B is used. 4a Force S The brake operated when the cylinder is extended by the S load. Energy efficiency, which greatly improves energy efficiency.

Since the amount of heat generated by the hydraulic oil due to throttle loss is reduced as compared with the conventional system, the bucket of the open circuit C that can reduce the size of the cooling device is reduced. Hydraulic pump for Tosylinder IE

Since it is possible to distribute the weight of 23 to the bulk cylinders a and B of the closed circuits A and B, it is possible to distribute the weight to the bulk cylinder. Hydraulic pump of arm cylinder 4a

22 can be miniaturized, the mounting of the pump becomes easy, and the cost can be reduced.

Boom cylinder 3a, arm cylinder 4a ぴ When the package cylinder 5a is operated in conjunction □ ヽ Each circuit A, B

Hydraulic pump 21 with cylinder C ύ a, 4 a, 5 a

22 23 can be driven, and if necessary, hydraulic cylinder pump 23 power for driving the cylinder cylinder 23 Boom cylinder cylinder cylinder 4 Pressure oil can be distributed to a, which reduces load interference and improves operability compared to conventional systems.

When the actuator is linked, the load is large. When the power of the engine 7 is insufficient, the engine is operated via the inverter / inverter 64 from the controller 65.

Supply 63 ft>-force

The power transmission 20 is driven by the electric motor 63,

On the other hand, in the case where the load of the engine 7 is small π, the engine 7 drives the electric generator 63 to generate a lightning force, and the m-force is used as an in-notter. / V via the computer 64

Charge to V 65,

By the above-mentioned operation, the output of the engine 7 can be smoothed.

It is possible to reduce the size of car 7

Next, another embodiment of the drive shown in FIG.

■ In Figure 2 of 0, which shows the 6 drama, the basic system configuration is almost the same as that of the embodiment shown in Figure 1 Therefore, the same parts are denoted by the same reference numerals, and the description thereof will be omitted, and only the parts that are not described will be described.) O

In FIG. 2, the engine includes this engine.

7 is connected to a generator 50 that is driven by the motor 7 and is connected to a generator 50 for driving the projector 3a.

The electric motor as the first electric motor having the sword • The electric motor 51 The second electric motor having the function of the electric motor for driving the damper V 4a The motor 53 as a third motive for driving the bucket V-cylinder 5a includes an i-motor-generator 52 and a generator 51, 52. Moment for controlling the current of the motive 53 They are connected to each other via the π-units 54 55 and 56 via the wiring.

An electric / generator 51 is connected to a hydraulic pump 57 as a fluid pressure pump of the whistle 1 which can be rotated in the normal and reverse directions for driving the bobbin cylinder 3a. Electric • Generator 52

A hydraulic pump 58 is connected as a reversible second hydraulic pump for driving the one-minder 4a, and the motor 53 is provided with a packet system. A hydraulic pump 59 as a third hydraulic pump for driving the cylinder 5a is connected. Hydraulic pumps 57 and 58 also function as hydraulic motors when supplied with hydraulic oil.

Further, a first closed circuit A is provided for the boom cylinder 3a. The first closed circuit A controls the rotation speed of the electric motor / generator 51 so that the discharge flow rate of the hydraulic pump 57 connected to the electric motor 51 is controlled. To

Then, the operation speed of the boom cylinder 3a connected to the pressure pump 57 is controlled.

Similarly, a second closed circuit is provided for the arm cylinder 4a.

B power S is set up ぃ 5. The second closed circuit B controls the rotation speed of the electric generator 52, and the discharge flow of the hydraulic pump 58 connected to the electric generator 52 is controlled by the second closed circuit B. By adjusting the pressure, the operating speed of the arm cylinder 4a connected to the pressure pump 58 is controlled.

In addition, an open circuit C is provided for the socket cylinder '5a. This open circuit C is used for rotating the motor 53. By controlling the nos, the rotation speed of the hydraulic pump 59 connected to the electric motor 53 is controlled, and the hydraulic pump 59 is supplied with the power from the hydraulic pump 59. By controlling the flow rate of the hydraulic oil using the control valve 3 o and the bypass valve 62, the hydraulic oil connected to the control valve 35 is connected to the control valve 35. This circuit is used to control the operating speed of the cylinder 5a. The control knob 35 of this circuit C is used. ぴ A From the pump side from the bypass knob 62 A distribution circuit D for distributing the hydraulic oil of the pump 59 to the cylinder 3ajo and the cylinder 4a is branched and diverged.

The generator 50, the electric motor • The generator 51 52 and the electric motor 53 include a battery 60, which is used to charge and discharge the battery 60. It is connected via a notch 61 to generate the surplus power from the generator 50 and the brake power of the prime cylinder 3a and the arm cylinder 4a. A charge / discharge circuit E for charging / discharging the power and electric power generated by the generators 51 and 52 to / from the note V 60 is provided by these notches y 60 and dy. It is composed of an inverter / notter 61.

Next, the operation of the embodiment shown in FIG. 2 will be described.

(1) When not operating

In Fig. 2, when not operating, the motor • generator 51,

52 and the electric motor 53 are controlled to be stopped, and the solenoid-operated directional control valves 27a, 27b, 32a, 32b and the control port are connected. All the cylinders 35 are closed, and the nozzle 62 is opened. The cylinder 3a, cylinder 4a) and the cylinder 4a are closed. The case cylinder 5a keeps the stopped state.

(2) Actuator alone operation

Operate the bumper 3a independently to the extension side to

Electric motors and generators by V-unit lubricates 54

Current is supplied to 51 and hydraulic pump 57 is driven

When the electromagnetic switching valves 27a and 27b are opened, the hydraulic pressure pump opens.

57 is supplied from the solenoid-operated directional control valve 27b to the port chamber of the boom cylinder 3a.

On the other hand, the hydraulic oil in the side chamber of the pump cylinder 3a is returned to the hydraulic pump 57 from the electromagnetic switching valve 27a.

At this time, the return oil amount from the mouth cylinder, the chamber power, and the like of the boom cylinder 3a is changed from the hydraulic pump 57 to the bottom cylinder 3a of the boom cylinder 3a. Since the amount of oil supplied to the chamber is less than the amount of oil supplied to the chamber, the insufficient amount of return oil is supplied from the charge pump 24 via the check valve 40 for the charge. Supplied to hydraulic pump 57.

The speed of extension of the pump V 3a is further increased.The hydraulic opening is controlled by controlling the rotation of the motor 53 with the puff control unit 56. At the same time when the pump 59 is started to rotate, the bypass valve 62 is closed, and the electromagnetic ratio switching valve is switched.

By controlling P of 37, the hydraulic oil of the hydraulic pump 59 is refilled into the bottom chamber of the cylinder cylinder 3a.

When the boom cylinder y is operated independently to the compression side, m is set. • The machine 51 is controlled to rotate in the reverse direction to the above-mentioned stretching operation. Be

At this time, the pressure in the pot chamber of the Bums Cylinder 3a rises, and the hydraulic pump 57 drives the electric motor / generator 51 by operating the motor. You

Therefore, the electric motor / generator 51 operates as a generator, and generates electric power.

7 Power is supplied to other motors via a knob control unit 54 or is transferred to a nottery 60.

In addition, the amount of oil returned from the bottom chamber power of the pump cylinder 3a to the hydraulic pump 57 is greater than the amount of oil supplied to the rod chamber. The surplus oil is returned to the tank 42 from the flushing valve 25.

The expansion and contraction effect of the amm cylinder 4a is also

3 This is performed by the same action as a.

When the extension cylinder 5a is extended or retracted, the motive motor 53 is driven to supply hydraulic oil from the hydraulic pump 59 and to operate the pipe cylinder. 62 is closed, and the outlet of the control port 35 is controlled so that the pressurized oil is supplied to the bucket cylinder 5a and the expansion and contraction operation is performed.

(3) Actuator linked operation

When the boom cylinder 3a, the arm cylinder 4a and the packet cylinder 5a are operated in conjunction, the motor / generator 51 52 and the motor 53 are driven. , Boom cylinder 3a

'Is the hydraulic pump 57, the arm cylinder 4a is the hydraulic pump 58, and the pressure cylinder 5a is the hydraulic pump 59 from the hydraulic pump 59. Oil is supplied.

However, the Boomushi Vunder 3a and the Bamushi Vunder

If 4a requires more than the flow supplied by the hydraulic pump 57 58, the bypass valve 62 is used in accordance with the amount of each cylinder's reno. Is closed, and the aP of the solenoid-operated directional control valves 37 and 39 is controlled, and the hydraulic oil of the hydraulic pump 59 is supplied to the Boom cylinder 3a and the Cylinder cylinder 4a. It is controlled so that the cylinder speed corresponding to the supplementary operation can be obtained.

Next, the effects of the embodiment shown in Fig. 2 will be explained.

The rotation speed of the hydraulic pumps 57, 58 in the closed circuit AB is controlled by the motor • generator 5152, so that the boom cylinder V in the closed circuit AB is controlled. a

Since the operating speed of 4a is controlled, the loss of squeezing at the control port of the conventional system can be greatly reduced, and the closed circuits A, B The power efficiency can be greatly improved because the pump power can be recovered when the pneumatic cylinders a and plum cylinders 4a are operated by the load. \ z

Since the amount of heat generated by the hydraulic oil due to squeezing loss is reduced as compared with the conventional system, the knockout of the open circuit C that makes the cooling device smaller can be achieved. Hydraulic pump for cylinder drive

Since it is possible to distribute the flow rate of 59 to the bumper cylinder 4a of the closed circuit AB and the bumper cylinder 4a, the Hydraulic pressure pin of the pharmacy 4a 57 57 58 Electric / generators 51 and 52 can be reduced in size, so that pumps / motors / generators can be mounted easily and the cost can be reduced.

Operate the bumper V a 、 a, the aram cylinder 4a and the knot V 5 5a □, each circuit A B

C cylinders 3a, 4a and 5a can be driven by a unique hydraulic pump, and if necessary, from a hydraulic pump 59 for driving a bucket cylinder. Since the pressurized oil is supplied to the bumper cylinder 3a and the dam cylinder 4a, the load interference is reduced as compared with the conventional system, and the operation is easier. Easy to become

Electric * generators 51 and 52 that have the function of a generator that generates brake power when the pump 3a and the arm 4a are operated by the load. Charges and discharges the power recovered by power generation and generated during low loads, and excess power.

Suitable for E.Pact 60 ク

Since power is supplied from 60 and the output of engine 7 is smoothed, engine 7 can be downsized compared to the conventional system. . Possibility of industrial use

The present invention is not limited to the hydraulic shovel, but may be used for other working machines such as da, burd, and z.

Claims

5 years of request

1. Fluid pressure P whose flow rate P is adjusted by variable means

• A closed circuit that controls the operating speed of the fluid pressure contactor connected to the fluid pressure pump in the variable capacity control of the pump. The variable pressure control of the fluid pressure pump, whose flow rate is adjusted to a different capacity variable means than the above capacity variable means that performs the body pressure pump, and from this fluid pressure pump A control valve that controls the supplied working fluid. A control valve that is installed in parallel with the control valve. An open circuit for controlling the operating speed of a fluid pressure actuator connected to the inlet and outlet with the flow control by the

And a distribution circuit for distributing the working fluid of the fluid pressure pump in the circuit to the body pressure actuator in the closed circuit.

Drive device for work machine characterized by having-

2. A pump operated by a boom cylinder, a pram operated by a boom cylinder, and a pouch operated by a socket cylinder. A working machine equipped with a working device in which buckets to be operated are sequentially connected to each other,

The flow rate P is adjusted by the first capacity variable means.

-1st fluid pressure pump with variable control of fluid pressure pump capacity

A first closed circuit for controlling the operating speed of the boom cylinder connected to the pump; The second fluid pressure pump is a second fluid pressure pump whose flow rate is adjusted by the variable fluid pressure control means by the variable capacity control of the second fluid pressure pump. A second closed circuit for controlling the operation speed of the arm cylinder connected to the pump;

Different from the above first and second variable capacity means

The variable capacity control of the third fluid pressure pump whose flow is adjusted by the third capacity variable means, and the control means for controlling the working fluid supplied from the third fluid pressure pump. The lubrication valve is connected to the lubrication port connected to the lubrication port by the flow control by the non-passing lubricator installed in parallel with the lubrication lubrication valve. An open circuit to control the operating speed of the

And a distribution circuit for distributing the working fluid of the third fluid pressure pump of the circuit to the pump cylinder and the arm cylinder.

Drive device for work machine characterized by having

A motor that has both functions of a motor and a power generator that is mounted on the drive unit of the 3

Power generated by the engine's surplus power • Electricity generated by the power generated by the generator and the boost power of the bump cylinder and electric motor • Power generated by the generator power The generated power and the battery are charged to the battery V, and the engine power is supplied to the place P where the engine output is insufficient.

A charge / discharge circuit that assists the engine by driving the motor with the power discharged from the V-t y 2. A driving device for a working machine according to claim 2, wherein the driving device comprises:

4 • By controlling the rotation speed of the motor, the flow rate of the fluid pressure pump connected to this motor is adjusted, and the fluid pressure pump connected to this fluid pressure pump is adjusted. A closed circuit for controlling the operation speed of the heater;

Adjust the flow rate of the hydraulic pump in the closed circuit of the motor. By controlling the rotation speed of the motor different from the above motor, the rotation speed of the hydraulic pump connected to this motor is controlled. In addition, the working fluid supplied from this fluid pressure pump was installed in parallel with the control knob. A circuit for controlling an operation speed of a fluid pressure actuator connected to the control valve by controlling a flow rate by a bypass noreb;

And a distribution circuit for distributing the working fluid of the fluid pressure pump of the open circuit to the fluid pressure actuator of the closed circuit.

Drive of work machine characterized by having

5 • Plumb operated by a boom cylinder and a pram operated by a boom cylinder, and a pneumatic cylinder operated by a vault cylinder A work machine equipped with a work unit in which the vaults to be connected are sequentially connected.

By controlling the rotation speed of the first motor,

The first fluid pressure pump connected to the first lightning motive and the flow rate of the first fluid pressure pump adjusted to the first fluid pressure pump; The first closed circuit for controlling the operation speed of the cylinder and the second motor for controlling the rotation speed of a second t-motor different from the first motor are used for the second closed circuit. The second fluid pressure pump, which is in contact with the motive, is adjusted in flow rate to control the operating speed of the amplifying cylinder connected to the second fluid pressure pump. And the closed circuit of

Above ^ ¾¾Γ

It controls the rotation speed of a third electric motor, which is different from the first electric motor and the second electric motor, so that the third hydraulic pump connected to the third electric motor can be controlled. In addition to controlling the rotation speed, the working fluid supplied from the third fluid pressure pump is supplied in parallel with the outlet port of the control port. HX Connects to control valve by controlling the flow rate with the selected valve. In: s times to control the operating speed of the packet cylinder. Road and

And a distribution circuit for distributing the working fluid of the third fluid pressure pump of the open circuit of the open circuit to the boom cylinder and the arm cylinder.

A driving device for a working machine characterized by having a

6 • Both the first and second motors have the function of a motor.

A generator that is driven by the engine to supply power to the first motor, the second motor, and so on; and a generator that supplies power to the third motor;ン力をプをぴププ

Have a dagger A charge / discharge circuit for charging / discharging the battery with the electric power generated by the first motor and the second motor.

A driving device for a working machine according to claim 5, characterized by comprising: