CN107076183A - The oil pressure actuated systems of building machinery - Google Patents

Abstract

A kind of oil pressure actuated systems of building machinery, possess：Working oil is supplied to rotation motor and there is the first pump of the first rotary shaft；Working oil is supplied to swing arm cylinder and with the second pump of the second rotary shaft linked with the first rotary shaft；With the engine with the first rotary shaft or the output shaft of the second rotary shaft link；The driven gear of the first rotary shaft and/or the second rotary shaft is installed between the first pump and the second pump；The drive gear engaged with driven gear；Me icgcii motor with the 3rd rotary shaft that power is transmitted to drive gear；And the swing arm for guiding the working oil that slave arm cylinder is discharged when rotating with regeneration switching valve and declining swing arm guided during rotational deceleration from the working oil of rotation motor discharge to me icgcii motor to me icgcii motor uses at least one party in regenerating switching valve.

Description

Hydraulic drive system for construction machinery

technical field

The invention relates to a hydraulic drive system of a construction machine.

Background technique

In a construction machine such as a hydraulic excavator or a hydraulic crane, each part is driven by a hydraulic drive system. In such a hydraulic drive system, energy is regenerated using hydraulic oil returned from the actuator to the storage tank.

For example, Patent Document 1 discloses a hydraulic drive system configured to regenerate energy when a boom of a hydraulic excavator is lowered. The hydraulic drive system includes: a pump that supplies working oil to a boom cylinder; an engine that drives the pump; and a regenerative motor to which working oil discharged from the boom cylinder is guided when the boom is lowered. These pumps, motors, and regenerative motors are coaxially arranged. More specifically, the output shaft of the engine is connected to the rotation shaft of the pump, and the rotation shaft of the pump is connected to the rotation shaft of the regenerative motor.

Prior art literature:

Patent documents:

Patent Document 1: Japanese Patent Laid-Open No. 2008-128478.

Contents of the invention

Problems to be solved by the invention:

In a hydraulic drive system of a construction machine, for example, two pumps having the same capacity are often used as pumps for supplying hydraulic fluid to actuators. In this case, when two pumps are arranged in parallel, many large gears are required to transmit power from the pump directly connected to the engine to the other pump, and cost, weight, and space become problems. Therefore, it is desirable to arrange the two pumps coaxially.

However, in the structure in which the regenerative motor and the pump are coaxially arranged like the hydraulic drive system disclosed in Patent Document 1, if another pump is interposed, for example, between the pump and the regenerative motor, the regenerative motor will length becomes longer. Therefore, unless there is a large space in at least one direction, these assemblies cannot be installed, and the mounting of the assemblies on the construction machine is restricted.

Therefore, an object of the present invention is to provide a hydraulic drive system for a construction machine that can arrange a plurality of pumps coaxially and shorten the overall length of an assembly of an engine, a plurality of pumps, and a regenerative motor.

Means to solve the problem:

In order to solve the above-mentioned problems, the hydraulic drive system of the construction machine of the present invention includes: a first pump that supplies working oil to the swing motor and has a first rotating shaft; supplies working oil to the boom cylinder and has a pump that is connected to the first rotating shaft A second pump connected to the second rotating shaft; an engine having an output shaft connected to the first rotating shaft or the second rotating shaft; installed between the first pump and the second pump on the a driven gear of the first rotation shaft and/or the second rotation shaft; a driving gear meshing with the driven gear; a regenerative motor having a third rotation shaft transmitting power to the driving gear; and, a swing regenerative switching valve that guides hydraulic fluid discharged from the swing motor to the regenerative motor when the swing is decelerated, and a boom that guides hydraulic fluid discharged from the boom cylinder when the boom is lowered to the regenerative motor At least one of the valves is switched with regeneration.

According to the above configuration, the torque generated in the regenerative motor when the rotation is decelerated and/or when the boom is lowered is transmitted to the rotation shafts of the first pump and the second pump through the driving gear and the driven gear. Thus, the energy recovered by the regenerative motor can be used to assist the driving of the first pump and the second pump (energy regeneration). Furthermore, since the driven gear is located between the first pump and the second pump, the regenerative motor can be arranged on the side of the first pump and/or the second pump. Therefore, the overall length of the assembly of the engine, the first pump and the second pump, and the regenerative motor can be shortened.

The number of teeth of the drive gear may be smaller than the number of teeth of the driven gear. According to this configuration, the rotational speed decreases from the driving gear toward the driven gear. Therefore, a small hydraulic motor can be used as a regenerative motor according to the speed reduction ratio, and the cost can be reduced.

A one-way clutch capable of unidirectional power transmission from the third rotating shaft to the driving gear may be disposed between the third rotating shaft of the regenerative motor and the driving gear. According to this configuration, when energy is not being regenerated, the third rotation shaft of the regenerative motor can be prevented from being rotated by the power of the engine. Thereby, waste of energy can be suppressed further.

The regenerative motor may be a variable capacity motor whose tilt angle can be changed, and the hydraulic drive system includes: a regenerative motor adjuster for adjusting the tilt angle of the regenerative motor; When the switching valve guides hydraulic fluid to the regenerative motor, the control device of the regenerative regulator is controlled so that the inclination angle of the regenerative motor increases as the rotational speed of the rotating body increases. According to this configuration, appropriate energy recovery can be performed according to the rotational speed.

The regenerative motor may be a variable-capacity motor whose tilt angle can be changed, and the above-mentioned hydraulic drive system includes: a regenerative motor adjuster for adjusting the tilt angle of the regenerative motor; The regenerative switching valve controls the regenerative motor regulator so that the tilt angle of the regenerative motor increases as the pilot pressure output from the boom operating valve increases when the regenerative switching valve guides hydraulic oil to the regenerative motor. According to this configuration, appropriate energy recovery can be performed according to the speed at which the boom is lowered.

The driven gear may also be connected to the first rotation shaft and the second rotation shaft. According to this structure, the coupling which connects a 1st rotating shaft and a 2nd rotating shaft becomes unnecessary, and the number of parts can be reduced.

Invention effect:

According to the present invention, the overall length of the assembly of the engine, the pumps, and the regenerative motor can be shortened while arranging a plurality of pumps coaxially.

Description of drawings

FIG. 1 is a schematic structural diagram of a hydraulic drive system according to an embodiment of the present invention;

Fig. 2 is a side view of an oil hydraulic excavator as an example of a construction machine;

3 is a cross-sectional view of a portion of an assembly of an engine, first and second pumps, and a regenerative motor.

detailed description

FIG. 1 shows a hydraulic drive system 1 of a construction machine according to an embodiment of the present invention, and FIG. 2 shows a construction machine 10 equipped with the hydraulic drive system 1 . The construction machine 10 shown in FIG. 2 is a hydraulic excavator, but the present invention can also be applied to other construction machines such as hydraulic cranes.

The hydraulic drive system 1 includes a boom cylinder 11, an arm cylinder 12, and a bucket cylinder 13 shown in FIG. 2 as hydraulic actuators, and includes a swing motor 14 shown in FIG. For travel motors. Moreover, the hydraulic drive system 1 includes: a first pump 21 that supplies hydraulic fluid to a plurality of actuators including the swing motor 14 ; and a second pump 24 that supplies hydraulic fluid to a plurality of actuators including the boom cylinder 11 . In addition, in FIG. 1 , actuators other than the swing motor 14 and the boom cylinder 11 are omitted for simplification of the drawing.

In the present embodiment, the construction machine 10 is a self-propelled hydraulic excavator, but when the construction machine 10 is a hydraulic excavator mounted on a ship, the rotating body including the cab is rotatably supported by the ship body.

The first pump 21 and the second pump 24 are arranged coaxially with the engine 15 and driven by the engine 15 . In more detail, the first pump 21 has a first rotation shaft 22 , the second pump 24 has a second rotation shaft 25 , and the engine 15 has an output shaft 16 . In this embodiment, the first rotation shaft 22 of the first pump 21 and the second rotation shaft 25 of the second pump 24 are connected by a driven gear 35 described later. Also, in this embodiment, the first rotating shaft 22 of the first pump 21 is connected to the output shaft 16 of the engine 15 through a coupling not shown in the figure, but the second rotating shaft 25 of the second pump 24 may be connected to the output shaft 16 of the engine 15. 15 to the output shaft 16 (in other words, the engine 15, the second pump 24, and the first pump 21 may be arranged in this order).

Each of the first pump 21 and the second pump 24 is a variable capacity type pump (slant plate pump or inclined axis pump) whose inclination angle can be changed. The angle of inclination of the first pump 21 is adjusted by a first pump regulator 23 and the angle of inclination of the second pump 24 is adjusted by a second pump regulator 26 . The discharge flow rates of the first pump 21 and the second pump 24 may be controlled by negative control or by positive control. That is, the first pump regulator 23 and the second pump regulator 26 may be operated by oil pressure or by an electric signal.

The first flow path 41 extends from the first pump 21 to the storage tank, and the second flow path 61 extends from the second pump 24 to the storage tank. In addition, in FIG. 1, only the upstream side part of the flow paths 41 and 61 is shown.

A plurality of control valves (first control valve group) including a rotary control valve 44 are arranged on the first flow path 41 . The first parallel line 42 is branched from the first flow path 41 , and hydraulic oil is guided to all the control valves on the first flow path 41 through the first parallel line 42 . Similarly, a plurality of control valves (second control valve group) including the boom control valve 64 are arranged on the second flow path 61 . The second parallel line 62 is branched from the second flow path 61 , and hydraulic oil is guided to all the control valves on the second flow path 61 through the second parallel line 62 .

The swing control valve 44 controls supply and discharge of hydraulic fluid to the swing motor 14 . Specifically, the swing control valve 44 is connected to the swing motor 14 through a left rotation supply line 51 and a right rotation supply line 52 . Moreover, the accumulator line 43 is connected to the rotary control valve 44 .

The left rotation supply line 51 and the right rotation supply line 52 are connected to each other by a bridge 53 . A pair of pressure relief valves 54 are provided in opposite directions to each other on the bridge passage 53 . Between the left-rotation supply line 51 and the right-rotation supply line 52 , bypass passages 55 are provided so as to bypass the relief valves 54 , and check valves 56 are provided on the bypass passages 55 . A portion of the bridge path 53 between the pressure relief valves 54 is connected to a storage tank pipeline 57 .

The pilot port of the rotary control valve 44 is connected to the rotary operation valve 45 through a left rotary pilot line 46 and a right rotary pilot line 47 . The rotary operation valve 45 includes an operation rod, and outputs a pilot pressure corresponding to the amount of operation of the operation rod to the rotary control valve 44 .

The boom control valve 64 controls the supply and discharge of hydraulic oil to the boom cylinder 11 . Specifically, the boom control valve 64 is connected to the boom cylinder 11 through a boom raising supply line 68 and a boom lowering supply line 69 . Moreover, the accumulator line 63 is connected to the boom control valve 64 .

The pilot port of the boom control valve 64 is connected to the boom operation valve 65 through a boom up pilot line 66 and a boom down pilot line 67 . The boom operating valve 65 includes an operating rod, and outputs a pilot pressure corresponding to the amount of operation of the operating rod to the boom control valve 64 .

In addition, in the present embodiment, the hydraulic drive system 1 is configured to be able to regenerate energy at the time of rotation deceleration and when the boom is lowered. As a configuration for this purpose, the hydraulic drive system 1 includes a regenerative motor 27 , a swing regenerative switching valve 73 , and a boom regenerative switching valve 74 . However, only one of the swing regeneration switching valve 73 and the boom regeneration switching valve 74 may be provided to regenerate only the energy when the rotation is decelerated or when the boom is lowered.

Regarding the configuration on the rotation side, between the left rotation supply line 51 and the right rotation supply line 52 , a switching valve 71 for selecting any one of them is provided. The switching valve 71 is a solenoid valve (solenoid valve) in this embodiment, but may be a simple high-pressure selector valve. The switching valve 71 is connected to the regenerative motor 27 through a rotary regenerative line 72 . Further, a rotation regeneration switching valve 73 is provided in the middle of the rotation regeneration line 72 .

The rotation regeneration switching valve 73 can be at the non-recovery position blocking the rotation regeneration pipeline 72, and opening the rotation regeneration pipeline 72 (in other words, connecting the upstream side part and the downstream side part of the rotation regeneration pipeline 72). ) to switch between recycling positions. The switching valve 71 and the rotation regeneration switching valve 73 are controlled by the control device 8 . In addition, in FIG. 1, in order to simplify the drawing, only a part of the control line is drawn.

The left rotation pilot line 46 is provided with a first pressure gauge 83 for detecting the pilot pressure output from the rotary operation valve 45 during the left rotation operation, and the right rotation pilot line 47 is provided with a first pressure gauge 83 for detecting the output pressure from the rotary operation valve during the right rotation operation. 45 outputs the pilot pressure of the second pressure gauge 84 . In addition, when the switching valve 71 is a simple high-pressure selector valve, one pressure gauge configured to selectively detect the higher pilot pressure of the swing pilot lines 46 and 47 can be used as a pressure gauge for swing. count.

When the control device 8 performs a counterclockwise rotation operation (that is, when the pilot pressure detected by the first pressure gauge 83 is greater than zero), the switching valve 71 is switched to the second one that connects the right-hand rotation supply pipeline 52 and the regeneration pipeline 72 on the discharge side. One position, when the clockwise rotation operation is performed (that is, when the pilot pressure detected by the second pressure gauge 84 is greater than zero), the switching valve 71 is switched to the first position that connects the left-hand rotation supply pipeline 51 and the regeneration pipeline 72 on the discharge side. Second position.

In addition, the control device 8 turns the regenerative power for rotation when the clockwise rotation decelerates (that is, when the pilot pressure detected by the first pressure gauge 83 decreases) and when the clockwise rotation decelerates (that is, when the pilot pressure detected by the second pressure gauge 84 decreases). The switching valve 73 is switched to the recovery position, and the rotation regeneration switching valve 73 is maintained at the non-recovery position except when the clockwise rotation is decelerated and the clockwise rotation is decelerated. That is, the swing regenerative switching valve 73 guides the hydraulic fluid discharged from the swing motor 14 to the regenerative motor 27 at the time of deceleration of the counterclockwise rotation and the deceleration of the clockwise rotation.

Regarding the structure on the boom side, the boom regeneration switching valve 74 is provided in the middle of the boom raising supply line 68 . The boom regeneration switching valve 74 is connected to the regeneration motor 27 through a boom regeneration line 75 . In the present embodiment, the downstream side portions of the rotation regeneration conduit 72 and the boom regeneration conduit 75 merge with each other to form one merged path.

The boom regeneration switching valve 74 can be at the non-recovery position blocking the boom regeneration line 75 and opening the boom regeneration line 75 (in other words, supplying the boom cylinder 11 to the boom raising line 68 ). The part on the side communicates with the boom regeneration line 75) to switch between recovery positions. The boom regeneration switching valve 74 is controlled by the control device 8 .

The boom lowering pilot line 67 is provided with a third pressure gauge 85 for detecting the pilot pressure output from the boom operating valve 65 during the boom lowering operation. On the other hand, in the boom raising supply line 68 , between the boom cylinder 11 and the boom regeneration switching valve 74 , a device for detecting the pressure of the hydraulic oil discharged from the boom cylinder 11 when the boom is lowered is provided. Fourth pressure gauge 86 .

When the boom is lowered (that is, when the pilot pressure detected by the third pressure gauge 85 is greater than zero), the control device 8 switches the regeneration switch valve 74 for the boom to the recovery position, and the regenerative switch valve 74 for the boom is switched to the recovery position except when the boom is lowered. The switching valve 74 is maintained in the non-recovery position. That is, when the boom is lowered, the boom regenerative switching valve 74 guides the hydraulic oil discharged from the boom cylinder 11 to the regenerative motor 27 .

In the present embodiment, the regenerative motor 27 is a variable displacement motor (a swash plate motor or a slant axis motor) whose tilt angle can be changed. The tilt angle of the regenerative motor 27 is adjusted by a regenerative motor regulator 29 . In this embodiment, the regenerative motor regulator 29 operates by electrical signals. That is, the regenerative motor regulator 29 is controlled by the control device 8 . For example, when the regenerative motor 27 is a swash plate motor, the regenerative motor regulator 29 may be a regulator that electrically changes the oil pressure acting on a spool (spool) connected to the swash plate of the motor, or may be a regulator connected to the motor. The electric actuator connected by the inclined plate.

The control device 8 is connected to a first tachometer 81 that measures the rotational speed of the engine 15 . For example, when the rotation deceleration of the regenerative motor 27 is guided by the regenerative switching valve 73 for rotation, the control device 8 controls the regenerative motor regulator 29 so that the inclination angle is sufficient to absorb the constant rotation speed of the rotation motor 14 according to a certain engine rotation speed. The inclination angle of the flow to be found.

Alternatively, the control device 8 may be connected to a rotation speed detector (not shown) that detects the rotation speed of the rotating body including the cab. As the rotational speed detector, a tachometer for measuring the rotational speed of the swing motor 14 may be used, or an accelerometer installed in the cab may be used. Furthermore, when the rotation deceleration of the regenerative motor 27 is guided by the regenerative switching valve 73 for rotation, the controller 8 controls the regenerative motor regulator 29 so that the faster the rotation speed of the rotary body is, the larger the inclination angle of the regenerative motor 27 is. . Accordingly, appropriate energy recovery according to the rotational speed can be performed.

On the other hand, when the boom that guides hydraulic oil to the regenerative motor 27 through the boom regenerative switching valve 74 is lowered, the control device 8 uses the pilot pressure output from the boom operating valve 65 (that is, the boom lowering pilot line 67 The greater the pressure of the regenerative motor 27 is, the larger the inclination angle of the regenerative motor 27 is, and the regenerative motor regulator 29 is controlled. Accordingly, appropriate energy recovery according to the speed at which the boom is lowered can be performed.

The regenerative motor 27 has a third rotation shaft 28 . In this embodiment, the torque generated by the regenerative motor 27 when the rotation is decelerated and when the boom is lowered is passed from the third rotating shaft 28 through a one-way clutch 31 , a relay shaft 32 , a drive gear 33 , and an intermediate shaft. A gear (idler gear) 34 and a driven gear 35 transmit to the first rotation shaft 22 of the first pump 21 and the second rotation shaft 25 of the second pump 24 . Accordingly, it is possible to assist the driving of the first pump 21 and the second pump 24 (regeneration of energy) by utilizing the energy recovered by the regenerative motor 27 . Hereinafter, the power transmission structure thereof will be described in detail with reference to FIG. 3 .

In the present embodiment, the regenerative motor 27 is arranged on the side of the first pump 21 such that both rotation shafts 22 and 28 are parallel to each other. However, the regenerative motor 27 may be arranged on the side of the second pump 24 so that the rotating shafts 25 and 28 of both are parallel to each other.

The first pump 21 has a housing 21a that accommodates a pump mechanism not shown in the drawings. The end portion of the first rotating shaft 22 on the second pump 24 side is supported by the housing 21a via a bearing 21b. Similarly, the second pump 24 has a housing 24a that accommodates a pump mechanism that is not shown. The end portion of the second rotating shaft 25 on the side of the first pump 21 is supported by the housing 24a via a bearing 24b. Between the case 21a and the case 24a, a gear space open to the side is formed.

The driven gear 35 is arranged between the first pump 21 and the second pump 24 . In this embodiment, the driven gear 35 is attached to the first rotation shaft 22 of the first pump 21 and the second rotation shaft 25 of the second pump 24 . That is, the driven gear 35 has a cylindrical central portion extending across the first rotation shaft 22 and the second rotation shaft 25 , and functions to connect the first rotation shaft 22 and the second rotation shaft 25 .

The regenerative motor 27 has a case 27a that accommodates a motor structure not shown. A case 91 housing the drive gear 33 is integrally formed on the housing 27a. The drive gear 33 is supported by the housing 91 via the bearing 36 .

Power is transmitted from the third rotation shaft 28 of the regenerative motor 27 to the drive gear 33 . In the present embodiment, the relay shaft 32 is formed integrally with the drive gear 33 , and the one-way clutch 31 is arranged between the relay shaft 32 and the third rotating shaft 28 . The one-way clutch 31 enables one-way power transmission from the third rotating shaft 28 to the drive gear 33 .

The drive gear 33 meshes with a driven gear 35 via an intermediate gear 34 . The case 91 housing the drive gear 33 is provided with a pair of protruding pieces 92 that enter the gear space between the housings 21a, 24a. A rotating shaft 93 is mounted on these protruding pieces 92 , and the intermediate gear 34 is attached to the rotating shaft 93 via a bearing 37 .

In this embodiment, the number of teeth of the drive gear 33 is smaller than the number of teeth of the driven gear 35 . However, the number of teeth of the driving gear 33 may be equal to that of the driven gear 35 , or may be greater than the number of teeth of the driven gear 35 .

As described above, in the hydraulic drive system 1 of the present embodiment, the regenerative motor 27 is disposed on the side of the first pump 21, so that the engine 15, the first pump 21, the second pump 24, and the regenerative motor 27 can be shortened. The full length of the assembly.

In addition, in this embodiment, the number of teeth of the drive gear 33 is smaller than the number of teeth of the driven gear 35 , so the rotational speed decreases from the drive gear 33 toward the driven gear 35 . Therefore, a small hydraulic motor can be used as the regenerative motor 27 according to the speed reduction ratio, and the cost can be reduced.

Moreover, in this embodiment, the one-way clutch 31 is arranged between the rotating shaft 28 of the regenerative motor 27 and the drive gear 33, so that the third rotating shaft 28 of the regenerative motor 27 can be prevented from being damaged by the rotation of the engine 15 when energy is not regenerated. power to rotate. Thereby, waste of energy can be suppressed further.

(Other implementation forms)

The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

For example, in the above-described embodiment, the first rotating shaft 22 of the first pump 21 and the second rotating shaft 25 of the second pump 24 are connected by the driven gear 35 . However, it is also possible to install the driven gear 35 on either one of the first rotating shaft 22 and the second rotating shaft 25, and connect the first rotating shaft 22 and the second rotating shaft of the first pump 21 through a connector other than the driven gear 35 . The second axis of rotation 25 of the pump 24 . However, if the driven gear 35 plays the role of connecting the first rotating shaft 22 and the second rotating shaft 25 as in the above-mentioned embodiment, the coupling for connecting the first rotating shaft 22 and the second rotating shaft 25 is unnecessary, and parts can be reduced. quantity.

Also, it is not necessary to provide the one-way clutch 31 , and the drive gear 33 may be directly attached to the third rotating shaft 28 of the regenerative motor 27 . In this case, it is desirable to make the inclination angle of the regenerative motor 27 zero except when the rotation is decelerated and when the boom is lowered. Furthermore, the regenerative motor 27 does not necessarily need to be a variable displacement motor, but may be a fixed displacement motor.

Also, in the above embodiment, the drive gear 33 meshes with the driven gear 35 through the intermediate gear 34 , but the intermediate gear 34 may be omitted, and the drive gear 33 may directly mesh with the driven gear 35 .

In addition, when the intermediate gear 34 is omitted, the driving gear 33 and the driven gear 35 may be bevel gears, and the assembly of the first pump 21 and the second pump 24 and the regenerative motor 27 may be formed in a substantially T-shape. That is, the regenerative motor 27 may be arranged on the side of the first pump 21 and the second pump 24 . However, if the driving gear 33 and the driven gear 35 are spur gears as in the above-mentioned embodiment, the third rotation shaft 28 of the regenerative motor 27 can be connected to the first rotation shaft 22 of the first pump 21 and the first rotation shaft 22 of the second pump 24. The two rotating shafts 25 are parallel, and the regenerative motor 27 is disposed on the side of the first pump 21 or the second pump 24 . Accordingly, not only the overall length of the assembly of the first pump 21, the second pump 24, and the regenerative motor 27 can be shortened, but also the width of the assembly can be reduced.

Symbol Description:

1 hydraulic drive system;

10 construction machinery;

11 boom cylinder;

14 rotary motor;

15 engine;

16 output shaft;

21 first pump;

22 first axis of rotation;

24 second pump;

25 second axis of rotation;

27 regenerative motor;

28 third axis of rotation;

29 regenerative motor regulator;

31 one-way clutch;

33 drive gear;

35 driven gear;

65 boom operating valve;

73 Regenerative switching valve for rotation;

74 regenerative switching valve for the boom;

8 Controls.

Claims (6)

1. a kind of oil pressure actuated systems of building machinery, possess：

Working oil is supplied to rotation motor and there is the first pump of the first rotary shaft；

Working oil is supplied to swing arm cylinder and with the second pump of the second rotary shaft linked with first rotary shaft；

With the engine with first rotary shaft or the output shaft of second rotary shaft link；

The driven of first rotary shaft and/or second rotary shaft is installed between first pump and second pump Gear；

The drive gear engaged with the driven gear；

Me icgcii motor with the 3rd rotary shaft that power is transmitted to the drive gear；And

The rotation that the working oil discharged during rotational deceleration from the rotation motor is guided to the me icgcii motor is switched with regeneration The swing arm that valve and the working oil discharged from the swing arm cylinder when swing arm is declined guides to the me icgcii motor is with regenerating switching valve In at least one party.

2. the oil pressure actuated systems of building machinery according to claim 1, it is characterised in that

The number of teeth of driven gear is few described in the gear ratio of the drive gear.

3. the oil pressure actuated systems of building machinery according to claim 1 or 2, it is characterised in that

Between the 3rd rotary shaft of the me icgcii motor and the drive gear, being configured with can realize from the described 3rd The one-way clutch of the unidirectional power transmission of drive gear described in axial rotary.

4. according to the oil pressure actuated systems of building machinery according to any one of claims 1 to 3, it is characterised in that

The me icgcii motor is the motor for the variable capacity type that tilt angle can be changed,

Possess：Adjust the me icgcii motor adjuster of the tilt angle of the me icgcii motor；And

When guiding working oil to the me icgcii motor with regeneration switching valve by the rotation, got over the rotary speed of rotary body The control device of adjuster is regenerated described in the bigger form control of the tilt angle of the me icgcii motor.

5. according to the oil pressure actuated systems of building machinery according to any one of claims 1 to 4, it is characterised in that

The me icgcii motor is the motor for the variable capacity type that tilt angle can be changed,

Possess：Adjust the me icgcii motor adjuster of the tilt angle of the me icgcii motor；And

When guiding working oil to the me icgcii motor with regeneration switching valve by the swing arm, exported with slave arm operation valve The control device of me icgcii motor adjuster described in the bigger form control of the tilt angle of the first pilot me icgcii motor.

6. according to the oil pressure actuated systems of building machinery according to any one of claims 1 to 5, it is characterised in that

The driven gear links first rotary shaft and second rotary shaft.