JP2006335222A - Hybrid type driving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hybrid type driving device capable of driving pumps with a motor-generator in the condition that the engine is stopped. <P>SOLUTION: A first clutch 12a is connected with the engine 11, and the input side shaft 13 of a power transmitting device 14 is connected with this clutch 12a, and a plurality of pumps 17A and 17B with variable displacement are connected in series to the output shaft 15 of the power transmitting device 14. A starter motor generator 18 to function as a generator and also as a motor is connected in series to the engine 11. In the parallel relation with the engine 11 for the pumps 17A and 17B, the motor-generator 22 to function as a generator being driven by the engine 11 and as a motor upon receiving the supply of the electric power is connected with the input/output shaft 21 of the power transmitting device 14 through a second clutch 12b. A capacitor 23 is connected with the starter motor generator 18 and the motor-generator 22. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a hybrid drive device that drives a pump by a motor / generator connected to a power transmission device in parallel with an engine.

  An input shaft of the power transmission device is connected to the engine, a pump is connected to the output shaft of the power transmission device, and an electric / generator is connected to the power transmission device in a parallel relationship with the engine. The pump / motor that functions as a hydraulic pump and a hydraulic motor is connected to the power transmission device in parallel with the power transmission device, and the electric motor / generator stores the electric power supplied from the electric motor / generator that functions as a generator and the electric motor. There is a hybrid drive device to which a battery that supplies electric power to an electric motor / generator that functions as a motor is connected (see, for example, Patent Document 1).

The power transmission device incorporates a clutch mechanism for directly connecting the pump / motor to the electric / generator and disconnecting it from the engine / pump when the pump / motor drives the electric / generator as a hydraulic motor. .
JP 2004-190845 A (pages 15-16, FIG. 8)

  The hybrid drive system that uses the power of the engine and the power of the motor / generator simultaneously using the power transmission device is larger than the hybrid drive system that connects the engine and the motor / generator in series. Power is obtained, and the engine and the motor / generator can be downsized accordingly, but the pump cannot be driven by the motor / generator with the engine stopped.

  The hybrid drive device described in Patent Document 1 has a built-in clutch mechanism in the power transmission device. The clutch mechanism is an intermittent connection between the pump / motor and the motor / generator, and the pump / motor. This is related to the intermittent connection between the engine and the pump, and not between the engine and the power transmission device, so the pump cannot be driven by the motor / generator with the engine stopped. .

  The present invention has been made in view of these points, and an object of the present invention is to provide a hybrid drive device that can drive a pump with an electric motor / generator while the engine is stopped.

  The invention according to claim 1 includes an engine, a starter motor generator connected in series to the engine and driven by the engine to function as a generator, and also to function as an electric motor that receives power and starts the engine, and the engine A first clutch that interrupts the rotational power output from the power transmission device, a power transmission device having an input shaft connected to the first clutch, a pump connected to the output shaft of the power transmission device, and a power transmission device. A second clutch connected in parallel to the first clutch, and connected to the second clutch in a parallel relationship with the engine with respect to the pump and driven by the engine to function as a generator and receive power supply The electric motor / generator that functions as an electric motor, the starter motor generator that functions as an electric generator, and the electric power supplied from the electric motor / generator It is a hybrid drive device including a capacitor for supplying electric power to the starter motor generator and motor-generator that serves as a monitor motor.

  According to a second aspect of the present invention, the pump in the hybrid drive device according to the first aspect supplies the working fluid to the fluid pressure actuator control circuit, and the capacitor is provided by an energy regenerative motor provided in the fluid pressure actuator control circuit. It stores the power collected from the driven generator.

  According to a third aspect of the present invention, the pump in the hybrid drive device according to the first aspect supplies the working fluid to the fluid pressure actuator control circuit, and the motor / generator is provided with energy provided in the fluid pressure actuator control circuit. It is driven via a regenerative clutch by a regenerative motor.

  According to the first aspect of the present invention, the engine and the starter motor generator are connected in series (series system), and the engine and the motor / generator are connected in parallel to the power transmission device (parallel system). The series system and the parallel system can be selected by the first clutch and the second clutch provided between the engine and the motor / generator, so that both advantages can be utilized depending on the work situation. . For example, by disconnecting the first clutch and connecting the second clutch, the pump is driven by operating the motor / generator as an electric motor with the electric power stored in the capacitor in a quiet state with the engine stopped. In addition, by inserting the first clutch and the second clutch, a large pump power can be obtained by simultaneously using the power of the engine and the power of the motor / generator via the power transmission device, Furthermore, by connecting the first clutch and disengaging the second clutch, the motor / generator does not become an engine load, and the operating efficiency of the series system can be improved. The starter motor generator connected to the motor functions as an electric motor for starting the engine and the engine when the pump load is small. It can also function as a more driven generator, and further, by disengaging the first clutch, the starter motor generator can be generated independently of the hydraulic system. It can be charged efficiently.

  According to the second aspect of the present invention, the electric storage unit stores the electric power supplied from the electric motor / generator functioning as the electric generator and is recovered from the electric generator driven by the energy regeneration motor in the fluid pressure actuator control circuit. Therefore, it is possible to drive the pump for a long time with an electric motor / generator when the engine is stopped.

  According to the third aspect of the present invention, the surplus energy of the working fluid of the fluid pressure actuator control circuit is converted into electric power by the energy regeneration motor provided in the fluid pressure actuator control circuit via the regeneration clutch. Since the motor / generator is directly driven, the number of generators in the fluid pressure actuator control circuit can be reduced and the energy efficiency can be improved. Further, when the motor / generator is directly driven by the energy regenerative motor in the fluid pressure actuator control circuit, the motor / generator is not affected by the pump load by separating the second clutch. Can generate good power. That is, high power generation efficiency is obtained by the two clutches.

  Hereinafter, the present invention will be described in detail with reference to one embodiment shown in FIGS. 1 to 3 and another embodiment shown in FIG. Note that oil and hydraulic pressure are used as the fluid and the fluid pressure.

  As shown in FIG. 3, the work machine 1 is a hydraulic excavator, and an upper swing body 4 is rotatably provided on a lower traveling body 2 via a swing bearing portion 3, and the upper swing body 4 includes an engine. A power unit 5 such as a fluid pressure pump, a cab 6 that protects an operator, and the like are mounted to form an airframe 7. The lower traveling body 2 includes traveling motors 2trL and 2trR for driving the left and right crawler belts, and the upper revolving body 4 is a turning electric motor for driving a turning speed reduction mechanism provided in the turning bearing portion 3. A generator (not shown in FIG. 3) is provided.

  A work device 8 is attached to the upper swing body 4. In this working device 8, a boom 8bm, a stick 8st, and a bucket 8bk are pin-coupled to a bracket (not shown) of the upper swing body 4 so as to be sequentially rotatable, the boom 8bm is rotated by a boom cylinder 8bmc, It is rotated by the stick cylinder 8stc, and the bucket 8bk is rotated by the bucket cylinder 8bkc.

  FIG. 1 shows a hybrid drive device 10. A first clutch 12 a for connecting and disconnecting rotational power output from the engine 11 is connected to the engine 11, and the input shaft of the power transmission device 14 is connected to the first clutch 12 a. 13 is connected, and a plurality of variable displacement pumps 17A and 17B are connected in series to the output shaft 15 of the power transmission device 14.

  The engine 11 is connected in series with a starter motor generator 18 that is driven by the engine 11 and functions as a generator and also functions as an electric motor that starts the engine 11 by receiving power. The starter motor generator 18 is connected to a starter motor generator controller 18c such as an inverter.

  A second clutch 12b is connected in parallel to the first clutch 12a to the input / output shaft 21 of the power transmission device 14, and the second clutch 12b is connected to the pumps 17A and 17B in parallel with the engine 11. An electric motor / generator 22 that is driven by the engine 11 and functions as a generator and receives electric power and functions as an electric motor is connected. The motor power of the motor / generator 22 is set smaller than the engine power. The motor / generator 22 is connected to a motor / generator controller 22c such as an inverter.

  The starter motor generator controller 18c and the motor / generator controller 22c receive the electric power supplied from the starter motor generator 18 and the motor / generator 22 that function as a generator via a capacitor controller 23c such as a converter. It is connected to a starter motor generator 18 that stores and functions as an electric motor, and a capacitor 23 that supplies electric power to the motor / generator 22. The battery 23 is a battery, a capacitor, or the like.

  The power transmission device 14 in the hybrid drive device 10 incorporates a continuously variable transmission mechanism such as a toroidal type or a planetary gear type, and can output the continuously variable rotation to the output shaft 15 by an external control signal. Yes.

  The pumps 17A and 17B in the hybrid drive device 10 supply a hydraulic fluid such as hydraulic fluid stored in the tank 24 to the fluid pressure actuator control circuit 25. An energy regenerative motor 26 is provided in the fluid pressure actuator control circuit 25, and electric power recovered from a generator 27 driven by the energy regenerative motor 26 via a generator controller 27c such as a converter is stored in a capacitor. Stored in 23.

  With respect to the fluid pressure actuator control circuit 25, the turning electric motor / generator 4sw is operated as an electric motor by the electric power supplied from the capacitor 23 of the hybrid drive device 10, and the upper rotating body 4 is operated as a generator at the time of turning braking. A turning control circuit 28 for collecting the electric power generated from the turning electric motor / generator 4sw in the battery 23 is installed.

  This turning control circuit 28 includes a turning electric motor / generator 4sw for turning the upper turning body 4 via a turning speed reduction mechanism 4gr, and a turning electric / generator controller 4swc such as an inverter. The electric power supplied from the electric storage device 23 of the driving device 10 functions as an electric motor, and when it is forcibly rotated by an inertial turning force, it functions as an electric generator and collects electric power in the electric storage device 23.

  The speed of the engine 11, the on / off state of the first clutch 12a, the on / off state of the second clutch 12b, the speed change of the power transmission device 14 and the like are controlled by signals output from the controller 29.

  FIG. 2 shows a fluid pressure actuator control circuit 25. The pump passages 31 and 32 connected to the discharge ports of the pumps 17A and 17B operate as electromagnetic proportional valves provided in a bypass passage returned to the tank 24. It is connected to the valves 33 and 34, and is connected to an electromagnetic valve 35 that operates as a travel straight valve.

  The solenoid valves 33 and 34 function as bypass valves. When there is no operation signal for the operator to operate the fluid pressure actuators 2trL, 2trR, 8bmc, 8stc, and 8bkc, the pump passages 31 and 32 are controlled by the control signal from the controller 29. The position is controlled to the fully open position communicating with the tank 24, and the operator is displaced to the closed position in proportion to the magnitude of the operation signal for operating the fluid pressure actuators 2trL, 2trR, 8bmc, 8stc, 8bkc.

  The solenoid valve 35 can supply the working fluid from the two pumps 17A and 17B to the fluid pressure actuators 2trL, 2trR, 8bmc, 8stc, and 8bkc in the left working position shown in FIG. In other words, the working fluid equally divided to the two traveling motors 2trL and 2trR is supplied from only one of the pumps 17B, and straight traveling is enabled.

  The fluid pressure actuator control circuit 25 includes a travel control circuit 36 that controls the working fluid supplied from the pumps 17A and 17B of the hybrid drive device 10 to the travel motors 2trL and 2trR, and the pumps 17A and 17B of the hybrid drive device 10. The working device control circuit 37 for controlling the working fluid supplied to the working actuators 8bmc, 8stc, and 8bkc for operating the working device 8 is provided.

  The traveling control circuit 36 includes electromagnetic valves 43 and 44 for controlling the direction and flow rate of the working fluid supplied through the working motor working fluid supply passages 41 and 42 drawn from the electromagnetic valve 35 that operates as a straight traveling valve. I have.

  The working device control circuit 37 includes a boom control circuit 45 that controls the working fluid supplied to the boom cylinder 8bmc from the pumps 17A and 17B of the hybrid drive device 10, and a stick from the pumps 17A and 17B of the hybrid drive device 10. A stick control circuit 46 for controlling the working fluid supplied to the cylinder 8stc, and a bucket control circuit 47 for controlling the working fluid supplied from the pumps 17A and 17B of the hybrid drive device 10 to the bucket cylinder 8bkc. Yes.

  The boom control circuit 45 includes an electromagnetic valve 49 that controls the direction and the flow rate of the working fluid supplied through the boom cylinder working fluid supply passage 48 drawn from the solenoid valve 35 that operates as a straight traveling valve. The working fluid supply / discharge passages 51 and 52 of the valve 49 are communicated with the head side chamber and the rod side chamber of the boom cylinder 8bmc.

  In the working fluid supply / discharge passage 51 on the head side, an electromagnetic valve 53 functioning as a fall prevention valve is interposed. When the boom is stopped, the electromagnetic valve 53 is controlled to be switched to the check valve position on the left side and lowered by the weight of the boom 8bm. To prevent. Further, an electromagnetic valve 54 functioning as a regeneration valve is provided between both the working fluid supply / discharge passages 51 and 52, and this solenoid valve 54 is controlled to be switched to the check valve position when the boom is lowered, so that the head of the boom cylinder 8bmc A part of the return fluid discharged from the side chamber is regenerated into the rod side chamber.

  On the tank passage side of the solenoid valve 49, a return fluid passage 55 for diverting the return fluid discharged from the boom cylinder 8bmc is provided, and in one return passage 56 and the other return passage 57 of the return fluid passage 55, Flow ratio control valves 58 and 59 for controlling the flow ratio of the flow divided into the return passages 56 and 57 are provided. The flow ratio control valves 58 and 59 are branched on one upstream side of the one electromagnetic valve 58 and one electromagnetic valve 58 for flow control provided in one return passage 56 having the energy regeneration motor 26. The other return valve 57 is provided with the other electromagnetic valve 59 for flow rate control.

  Then, the rotational speed of the energy regenerative motor 26 to be operated is controlled by the amount of return fluid in one of the return passages 56 whose flow rate is controlled by the flow rate control valves 58 and 59, and the generator driven by this energy regenerative motor 26 According to 27, electric power is supplied to and stored in the battery 23 of the hybrid drive device 10.

  The energy regenerative motor 26 is preferably operated when the electromagnetic valve 49 for directional control and flow control is in the right ventricle in FIG. That is, when the boom is lowered, the working fluid supply / discharge passage 51 on the head side of the boom cylinder 8bmc communicates with the return fluid passage 55, and the energy regeneration motor 26 is caused by the boom's own weight by the return fluid discharged from the head side of the boom cylinder 8bmc. It is desirable to operate with a margin.

  The stick control circuit 46 includes an electromagnetic valve 62 that controls the direction and the flow rate of the working fluid supplied through the stick cylinder working fluid supply passage 61 drawn from the solenoid valve 35 that operates as a straight traveling valve. The working fluid supply / discharge passages 63 and 64 of the valve 62 communicate with the head side chamber and the rod side chamber of the stick cylinder 8stc. In addition, an electromagnetic valve 65 that functions as a regeneration valve from the rod side to the head side is provided between both working fluid supply / discharge passages 63 and 64, and this solenoid valve 65 is switched to the check valve position when the stick-in is lowered. By controlling, the return fluid discharged from the rod side chamber of the stick cylinder 8stc is regenerated into the head side chamber.

  The bucket control circuit 47 includes an electromagnetic valve 67 that controls the direction and the flow rate of the working fluid supplied through the bucket cylinder working fluid supply passage 66 drawn from the solenoid valve 35 that operates as a straight traveling valve. The working fluid supply / discharge passages 68 and 69 of the valve 67 are communicated with the head side chamber and the rod side chamber of the bucket cylinder 8bkc.

  Between the stick cylinder working fluid supply passage 61 and the head side of the boom cylinder 8bmc, there is provided a circuit-to-circuit communication passage 71 between the stick and boom that communicates these, and a circuit-to-circuit communication passage 71 between the stick and boom. The stick-to-boom solenoid valve 72 is displaced between a position allowing the one-way flow from the stick cylinder working fluid supply passage 61 to the head side of the boom cylinder 8bmc and a position blocking the flow. Is provided.

  Between the working fluid supply passage 66 for the bucket cylinder and the working fluid supply passage 61 for the stick cylinder, an inter-circuit communication passage 73 between the boom and the stick communicating between them is provided. In the inter-communication passage 73, there is provided a boom-stick electromagnetic valve 74 having a position allowing a one-way flow from the bucket cylinder working fluid supply passage 66 to the stick cylinder 8stc and a position for blocking. .

  Various solenoid valves 33, 34, 35, 43, 44, 49, 53, 54, 58, 59, 62, 65, 67, 72, and 74 are solenoids proportionally controlled by the controller 29 shown in FIG. A return spring (not shown) is provided, and the displacement is controlled to a position where the solenoid exciting force and the spring restoring force are balanced.

  Each power of the starter motor generator 18 and the motor / generator 22 can be set smaller than the engine power.

  As described above, the starter motor generator 18 is connected to the engine 11, the engine 11 is connected to the power transmission device 14 via the first clutch 12a, and the motor / generator 22 is connected to the second clutch 12b. The two variable displacement pumps 17A and 17B are connected in series on the output side of the power transmission device 14. That is, the engine 11 and the starter motor generator 18 are connected in series to form a series system, and the engine 11 and the motor / generator 22 are connected in parallel to the power transmission device 14 to form a parallel system. Yes.

  Next, functions and effects of the embodiment shown in FIGS. 1 to 3 will be described.

  The engine 11 and the starter motor generator 18 are connected in series (series system), and the engine 11 and the motor / generator 22 are connected in parallel to the power transmission device 14 (parallel system). The system includes a first clutch 12a provided between the engine 11 and the power transmission device 14 and a second clutch provided between the motor / generator 22 and the power transmission device 14 according to the work situation. In the series system, the engine power is stored in the capacitor 23 via the starter motor generator 18, and in the parallel system, the engine power is stored in the capacitor 23 via the motor / generator 22. So, depending on the work situation, you can take advantage of both of them.

  For example, during heavy load work with a large pump load, both the clutches 12a and 12b are connected and the starter motor generator 18 and the motor / generator 22 function as an electric motor. Is input to the crankshaft of the engine 11 and motor power from the motor / generator 22 is input to the power transmission device 14 to drive the pumps 17A and 17B with these three powers.

  Also, in the series system, when there is a surplus in engine power relative to the power required from the pumps 17A and 17B, the starter motor generator 18 is caused to function as a generator, and the electric power generated from the starter motor generator 18 is reduced. When the engine power is stored in the battery 23 and the engine power cannot satisfy the power required from the pumps 17A and 17B, the starter motor generator 18 is caused to function as an electric motor, and the starter motor generator power is added to the engine 11. If the engine power still does not meet the power required by the pumps 17A and 17B, connect both clutches 12a and 12b to allow the motor / generator 22 of the parallel system to function as an electric motor and make the engine 11 starter motor. Add generator power and electric / generator power.

  When working with light loads with a relatively small pump load, connect one clutch 12a or 12b and disconnect the other clutch 12b or 12a, and connect the pumps 17A and 17B with one of the engine 11 or motor / generator 22 To drive.

  For example, the first clutch 12a provided between the engine 11 and the power transmission device 14 is disconnected, and the second clutch 12b is connected, so that the engine 11 is stopped in a quiet state. Since the pumps 17A and 17B can be driven by operating the motor / generator 22 as an electric motor with the stored power, work up to engine repair in the event of a failure in the engine 11 or engine noise becomes a problem Suitable for low noise work in urban areas or at night.

  Further, the first clutch 12a is disconnected, the second clutch 12b is connected, and when the pumps 17A and 17B are driven using the motor / generator 22 as an electric motor, the engine 11 is operated to start the starter motor power generation. When the machine 18 is driven as a generator, the battery 23 can be charged during work.

  On the other hand, when the first clutch 12a is connected and the second clutch 12b is disconnected, the engine 11 can efficiently drive only the pump load without dragging the motor / generator 22.

  Also, when both clutches 12a and 12b are connected, if there is no pump load or it is light, starter motor generator 18 and motor / generator 22 function as a generator, and engine power is used as a starter motor generator. 18 and the motor / generator 22, and the capacitor 23 can be efficiently charged by the starter motor generator 18 and the motor / generator 22.

  Thus, when both clutches 12a and 12b are connected, a large pump power can be obtained by simultaneously using the power of the engine 11 and the power of the motor / generator 22 via the power transmission device 14. The starter motor generator 18 connected in series to the engine 11 functions as an electric motor for starting the engine, and can function as a generator driven by the engine 11 when the engine load is small. Since the starter motor generator 18 can be generated independently of the hydraulic system by disengaging the first clutch 12a, the battery 23 together with the motor / generator 22 can be charged efficiently.

  The capacitor 23 stores the electric power supplied from the starter motor generator 18 and the motor / generator 22 that function as a generator, and collects it from the generator 27 driven by the energy regeneration motor 26 in the fluid pressure actuator control circuit 25. Since the generated electric power is also stored, the pump can be driven for a long time by the motor / generator 22 with the engine stopped while receiving sufficient electric power.

  Further, the work device control circuit 37 diverts the return fluid discharged from the boom cylinder 8bmc in the return fluid passage 55, and controls the diverted flow rate ratio by the flow rate control valves 58 and 59. The energy regenerative motor 26 is operated by one return fluid whose flow rate is controlled by the control valves 58 and 59, and the generator 27 is driven by the energy regenerative motor 26 to supply power to the battery 23 of the hybrid drive device 10. Therefore, by gradually increasing the flow rate ratio that is diverted to the energy regenerative motor 26 from the time when the return fluid from the boom cylinder 8bmc is generated, it is possible to prevent the occurrence of shock at the start of the motor, and the boom cylinder 8bmc Stable operation of the boom cylinder 8bmc can be obtained by suppressing the load fluctuation.

  That is, when the boom 8bm of the working device 8 falls by its own weight, the energy of the return fluid discharged from the head side of the boom cylinder 8bmc is controlled by controlling the opening degree of one electromagnetic valve 58 and the other electromagnetic valve 59. Can be smoothly absorbed by the energy regenerative motor 26, and the load drop operation on the head side of the boom cylinder 8bmc can be suppressed to stabilize the operation of dropping the own weight of the boom 8bm.

  Further, in the return fluid passage 55 for diverting the return fluid discharged from the boom cylinder 8bmc, the one solenoid valve 58 and the other solenoid valve 59 can be placed anywhere in the one return passage 56 and the other return passage 57. They can be installed separately, and the opening degree of one return passage 56 and the other return passage 57 can be individually controlled without being related to each other, and there is a degree of freedom in control.

  Further, when the upper turning body 4 turned by the turning electric motor / generator 4sw operating as the electric motor with respect to the lower traveling body 2 is stopped, the turning control circuit 28 sets the turning electric motor / generator 4sw as the generator. By actuating, the turning of the upper turning body 4 can be braked and the electric power generated from the electric motor / generator 4sw for turning is combined with the electric power generated from the electric generator 27 driven by the energy regenerative motor 26. It can be efficiently collected in the battery 23 and can be regenerated as pump power of the hybrid drive device 10.

  Also, by opening the boom-stick solenoid valve 74 to the one-way flow position and closing the stick-boom solenoid valve 72, the working fluid supplied from one pump 17A to the boom cylinder 8bmc By joining the working fluid supplied from 17B to the stick cylinder 8stc, the speed of the stick cylinder 8stc can be increased, and by closing the boom-stick solenoid valve 74 and opening the stick-boom solenoid valve 72, The working fluid supplied to the stick cylinder 8stc from the other pump 17B is supplied to the head side of the boom cylinder 8bmc from the pump 17A through the boom cylinder working fluid supply passage 48 and the left chamber of the solenoid valve 49. The boom-up operation can be speeded up by joining the two.

  As described above, the starter motor generator 18 is connected to the engine 11, the engine 11 is connected to one input side of the power transmission device 14 via the first clutch 12a, and the motor / generator 22 is powered. Since the two variable displacement pumps 17A and 17B are connected in series to the other input side of the transmission device 14 and to the output side of the power transmission device 14, that is, the engine 11 and the starter motor generator 18 are connected to each other. Since the engine 11 and the motor / generator 22 are connected in parallel to each other and connected in parallel to the power transmission device 14 to form a parallel system, the series system and the parallel system are thus configured. A hybrid system that can use both of them has a high degree of freedom in combination. The pumps 17A and 17B can be pumps similar to those of the conventional fluid pressure circuit.

  Next, another embodiment is shown based on FIG. In FIG. 4, the same parts as those shown in FIG.

  The pumps 17A and 17B in the hybrid drive device 10 supply working fluid to the fluid pressure actuator control circuit 25, and the motor / generator 22 is regenerated by an energy regeneration motor 26 provided in the fluid pressure actuator control circuit 25. It is configured to be driven via the clutch 111.

  Then, without converting the surplus energy of the working fluid of the fluid pressure actuator control circuit 25 into electric power, the motor / generator is connected via the regeneration clutch 111 by the energy regeneration motor 26 provided in the fluid pressure actuator control circuit 25. Since 22 is directly driven, the number of generators in the fluid pressure actuator control circuit 25 can be reduced and the energy efficiency can be improved.

  On the other hand, when the energy regeneration motor 26 is not operated or when the pumps 17A and 17B are driven only by the engine 11, the regeneration clutch 111 is disconnected and the energy regeneration motor 26 becomes a load of the hybrid drive device 10. Can be prevented.

It is a block diagram which shows one Embodiment of the hybrid type drive device which concerns on this invention. It is a circuit diagram which shows one Embodiment of the control circuit driven by the drive apparatus same as the above. It is a side view of the working machine provided with the drive device same as the above. It is a circuit diagram which shows other embodiment of the control circuit driven by the drive apparatus same as the above.

Explanation of symbols

11 engine
12a First clutch
12b Second clutch
13 Input shaft
14 Power transmission device
15 Output shaft
17A, 17B pump
18 Starter motor generator
22 Electric generator
23 Battery
25 Fluid pressure actuator control circuit
26 Energy regeneration motor
27 Generator
111 Regenerative clutch

Claims (3)

Engine,
A starter motor generator connected in series to the engine and driven by the engine to function as a generator and to function as an electric motor that receives power and starts the engine;
A first clutch for intermittently rotating power output from the engine;
A power transmission device having an input shaft connected to the first clutch;
A pump connected to the output shaft of the power transmission device;
A second clutch connected in parallel with the first clutch to the power transmission device;
An electric motor / generator which is connected to the second clutch in a parallel relationship with the engine with respect to the pump and is driven by the engine to function as a generator and which receives power supply and functions as an electric motor;
A starter motor generator that functions as a generator, and a starter motor generator that functions as an electric motor while accumulating electric power supplied from the motor / generator and a capacitor that supplies electric power to the motor / generator. Hybrid drive unit. The pump supplies working fluid to the fluid pressure actuator control circuit,
The hybrid drive device according to claim 1, wherein the electric storage unit stores electric power recovered from a generator driven by an energy regenerative motor provided in the fluid pressure actuator control circuit. The pump supplies working fluid to the fluid pressure actuator control circuit,
The hybrid drive device according to claim 1, wherein the motor / generator is driven via a regeneration clutch by an energy regeneration motor provided in the fluid pressure actuator control circuit.

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