JP5583917B2 - Hybrid construction machine - Google Patents

Description

  The present invention relates to a hybrid construction machine.

  For example, in a working machine such as an excavator, a lifting magnet vehicle, or a crane, a so-called hybrid construction machine that includes a battery and an AC motor and assists driving of the engine by a power running operation of the AC motor is known (for example, see Patent Document 1). .

JP 2001-3398 A

  Hybrid construction machines are equipped with a large number of devices that operate by electricity, and it is necessary to ensure the reliability of these devices. On the other hand, many vibrations are generated in construction machines. For example, it is conceivable to integrally form a plurality of inverters, which are devices that operate by electricity, but if formed in this way, the size of the device increases. When vibration occurs, a large moment is generated in a large-sized device. Therefore, in order to ensure reliability, it is necessary to make the device strong and to increase its rigidity. In order to obtain a highly rigid device, the size of the device inevitably increases.

  The present invention has been made in view of the above problems, and a hybrid construction machine capable of improving reliability by increasing resistance to vibration of a mounted device while avoiding an increase in size. The purpose is to provide.

  In order to solve the above problems, a hybrid construction machine according to the present invention supplies a motor generator connected to an internal combustion engine, first drive control means for driving and controlling the motor generator, and power to the motor generator. And a storage control unit that controls charging / discharging of the storage battery, wherein the first drive control unit is disposed adjacent to the motor generator, and the storage control unit is disposed adjacent to the storage battery. To do.

  In the hybrid construction machine of the present invention, the first drive control means and the motor generator are arranged adjacent to each other, the power storage control means and the storage battery are arranged adjacent to each other, and the first drive control means and the power storage control means are arranged. Since each can be freely arranged via wiring for power supply, the degree of freedom of arrangement of these devices is ensured and the size of these devices can be reduced. Since generation | occurrence | production of a moment can be suppressed by this, it becomes possible to improve the anti-vibration property of these apparatuses. In addition, since the wiring between adjacent devices can be shortened, the structure is simplified and the vibration resistance is improved.

  In the hybrid construction machine, the first drive control means generates a first switching element for generating a signal for controlling the drive of the motor generator and a signal for controlling the switching of the first switching element. A first CPU may be provided. In this case, the first switching element for controlling the drive of the motor generator is controlled by the first CPU, and the first CPU is provided in the first drive control means. The wiring between the switching elements can be shortened. Therefore, noise resistance and reliability are improved.

  In the hybrid construction machine, the power storage control means includes a second switching element for generating a signal for controlling charging / discharging of the storage battery, and a second for generating a signal for switching control of the second switching element. A CPU may be provided. In this case, since the second switching element for controlling the storage battery is controlled by the second CPU, and the second CPU is provided in the second drive control means, the second CPU and the second switching element The wiring between the two can be shortened. Therefore, noise resistance and reliability are improved.

  Further, in the hybrid construction machine, a traveling mechanism, a revolving body provided on the upper portion of the traveling mechanism via a revolving mechanism, a revolving body that is powered by a storage battery and drives the revolving mechanism, And a second drive control means for driving and controlling the electric motor. The second drive control means may be disposed adjacent to the turning electric motor. In this case, the electric motor for turning and the second drive control means are arranged adjacent to each other, and the second drive control means is free to the power supply source via the wiring for receiving the power supply. Can be arranged. As a result, the turning electric motor and the second drive control means can be configured to be non-integrated with the power storage control means or the like that is a power supply source, so that the size of the apparatus can be reduced. Further, since the wiring between the turning electric motor and the second drive control means can be shortened, the structure is simplified and the vibration resistance is improved.

  Further, in the hybrid construction machine, a boom connected to the work element and moving the work element, and a boom regenerative generator that performs a regenerative operation by the operation of the boom and supplies electric power generated by the regenerative operation to the storage battery, And a third drive control means for controlling the boom regeneration generator, wherein the third drive control means is arranged adjacent to the boom regeneration generator. In this case, the boom regeneration generator and the third drive control means are arranged adjacent to each other, and the third drive control means is connected to the power supply source via the wiring for receiving power supply. It can be arranged freely. As a result, the boom regeneration generator and the third drive control unit can be configured so as not to be integrated with the power storage control unit or the like that is a power supply source, so that the size of the apparatus can be reduced. Moreover, since the wiring between the boom regeneration generator and the third drive control means can be shortened, the structure is simplified and the vibration resistance is improved.

  In the hybrid construction machine, a controller that transmits a control signal for controlling the first drive control unit and the power storage control unit, and an operation that receives the driving operation and sends a control signal based on the driving operation content to the controller. And the controller may be arranged adjacent to the operation means. In this case, the wiring between the controller and the operation means can be shortened.

  ADVANTAGE OF THE INVENTION According to this invention, even in the environment where a vibration generate | occur | produces, the hybrid type construction machine which can improve reliability by improving the tolerance with respect to the vibration of the mounted apparatus is provided.

It is a perspective view which shows the external appearance of an excavator as an example of the working machine which concerns on this invention. It is a block diagram which shows internal structures, such as an electric system of a shovel, and a hydraulic system. It is a figure which shows the internal structure of an electrical storage means. It is a figure which shows the internal structure of an inverter. It is a schematic top view which shows arrangement | positioning of the component with which an shovel is provided. It is a figure which shows an example of piping of the cooling water in the cooling fluid circulation system with which an shovel is provided. It is a block diagram which shows internal structures, such as the electric system and hydraulic system of the shovel which concern on other embodiment. It is a schematic top view which shows arrangement | positioning of the component with which the shovel which concerns on other embodiment is provided.

  An embodiment of a hybrid work machine of the present invention will be described with reference to the drawings. In the description of the drawings, the same portions are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a perspective view showing an external appearance of an excavator 1 as an example of a hybrid construction machine according to the present invention. As shown in FIG. 1, the excavator 1 includes a traveling mechanism 2 including an endless track, and a revolving body 4 that is rotatably mounted on the upper portion of the traveling mechanism 2 via a revolving mechanism 3. The revolving body 4 is attached with a boom 5, an arm 6 linked to the tip of the boom 5, and a bucket 10 linked to the tip of the arm 6. The bucket 10 is a facility for scooping up earth and sand, for example. The boom 5, the arm 6, and the bucket 10 are hydraulically driven by a boom cylinder 7, an arm cylinder 8, and a bucket cylinder 9, respectively. Further, the revolving body 4 is provided with a power source such as a driver's cab 4a for accommodating an operator who operates the position of the bucket 10 and an engine 11 for generating hydraulic pressure. The engine 11 is composed of, for example, a diesel engine.

  FIG. 2 is a block diagram showing an internal configuration such as an electric system and a hydraulic system of the excavator 1 of the present embodiment. In FIG. 2, the mechanical power transmission system is indicated by a double line, the hydraulic system is indicated by a thick solid line, the steering system is indicated by a broken line, and the electrical system is indicated by a thin solid line. FIG. 3 is a diagram showing an internal configuration of the power storage means 100 in FIG.

  As shown in FIG. 2, the excavator 1 includes a motor generator 12 and a speed reducer 13, and the rotation shafts of the engine 11 and the motor generator 12 are connected to each other by being connected to the input shaft of the speed reducer 13. Has been. When the load of the engine 11 is large, the motor generator 12 assists (assists) the driving force of the engine 11 with its own driving force, and the driving force of the motor generator 12 passes through the output shaft of the speed reducer 13 to the main pump 14. Communicated. On the other hand, when the load on the engine 11 is small, the driving force of the engine 11 is transmitted to the motor generator 12 via the speed reducer 13, so that the motor generator 12 generates power. The motor generator 12 is configured by, for example, an IPM (Interior Permanent Magnetic) motor in which a magnet is embedded in the rotor. Switching between driving and power generation of the motor generator 12 is performed according to the load of the engine 11 and the like by the controller 30 that controls the drive of the electric system in the excavator 1.

  A main pump 14 and a pilot pump 15 are connected to the output shaft of the speed reducer 13, and a control valve 17 is connected to the main pump 14 via a high pressure hydraulic line 16. The control valve 17 is a device that controls the hydraulic system in the excavator 1. In addition to the hydraulic motors 2A and 2B for driving the traveling mechanism 2 shown in FIG. 1, a boom cylinder 7, an arm cylinder 8, and a bucket cylinder 9 are connected to the control valve 17 via a high pressure hydraulic line. The control valve 17 controls the hydraulic pressure supplied to them according to the operation input of the driver.

  The electrical terminal of the motor generator 12 is connected to the output terminal of an inverter 18A (first drive control means). The power storage means 100 is connected to the input terminal of the inverter 18A. As shown in FIG. 3, the power storage unit 100 includes a constant voltage power storage unit composed of positive and negative DC wires such as a DC bus 103, a step-up / down converter 102 (power storage control unit), and a battery 101 that is a storage battery, for example. And a variable voltage power storage unit configured by: In other words, the input end of the inverter 18 </ b> A is connected to the input end of the step-up / down converter 102 via the DC bus 103. A battery 101 as a storage battery is connected to the output terminal of the step-up / down converter 102. Details of the internal configuration of the step-up / down converter 102 will be described later.

  The inverter 18 </ b> A controls the operation of the motor generator 12 based on a command from the controller 30. That is, when the inverter 18 </ b> A causes the motor generator 12 to perform a power running operation, necessary power is supplied from the battery 101 and the step-up / down converter 102 to the motor generator 12 via the DC bus 103. Further, when the motor generator 12 is regeneratively operated, the battery 101 is charged with the electric power generated by the motor generator 12 via the DC bus 103 and the step-up / down converter 102. The switching control between the step-up / step-down operation of the step-up / down converter 102 is performed by the controller 30 based on the DC bus voltage value, the battery voltage value, and the battery current value. As a result, the DC bus 103 can be maintained in a state of being stored at a predetermined constant voltage value.

  A boom regeneration generator 300 is connected to the power storage means 100 via an inverter 18B (third drive control means). A hydraulic motor 310 is connected to the boom cylinder 7, and the rotating shaft of the boom regeneration generator 300 is driven by the hydraulic motor 310. The boom regeneration generator 300 is an electric work element that converts potential energy into electrical energy when the boom 5 is lowered by the action of gravity.

  The hydraulic motor 310 is configured to be rotated by oil discharged from the boom cylinder 7 when the boom 5 is lowered, and is provided to convert energy when the boom 5 is lowered according to gravity into rotational force. It has been. The hydraulic motor 310 is provided in the hydraulic pipe 7 </ b> A between the control valve 17 and the boom cylinder 7. The electric power generated by the boom regenerative generator 300 is supplied as regenerative energy to the power storage means 100 via the inverter 18B.

  Furthermore, a turning electric motor 21 as a working electric motor is connected to the power storage means 100 via an inverter 18C (second drive control means). The turning electric motor 21 is a power source of the turning mechanism 3 for turning the turning body 4. A resolver 22, a mechanical brake 23, and a turning speed reducer 24 are connected to the rotating shaft 21 </ b> A of the turning electric motor 21.

  When the turning electric motor 21 performs a power running operation, the rotational force of the rotational driving force of the turning electric motor 21 is amplified by the turning speed reducer 24, and the turning body 4 is subjected to acceleration / deceleration control to perform rotational motion. Further, due to the inertial rotation of the swing body 4, the rotation speed is increased by the swing speed reducer 24 and transmitted to the swing electric motor 21 to generate regenerative power. The turning electric motor 21 is AC driven by an inverter 18C by a PWM (Pulse Width Modulation) control signal. As the turning electric motor 21, for example, a magnet-embedded IPM motor is suitable.

  The resolver 22 is a sensor that detects the rotation position and rotation angle of the rotation shaft 21A of the turning electric motor 21, and mechanically connects to the turning electric motor 21 to detect the rotation angle and rotation direction of the rotation shaft 21A. When the resolver 22 detects the rotation angle of the rotation shaft 21A, the rotation angle and the rotation direction of the turning mechanism 3 are derived. The mechanical brake 23 is a braking device that generates a mechanical braking force, and mechanically stops the rotating shaft 21 </ b> A of the turning electric motor 21 according to a command from the controller 30. The turning speed reducer 24 is a speed reducer that reduces the rotational speed of the rotating shaft 21 </ b> A of the turning electric motor 21 and mechanically transmits it to the turning mechanism 3.

  An operation device 26 (operation means) is connected to the pilot pump 15 via a pilot line 25. The operating device 26 is an operating device for operating the turning electric motor 21, the traveling mechanism 2, the boom 5, the arm 6, and the bucket 10, and is operated by an operator. A control valve 17 is connected to the operating device 26 via a hydraulic line 27, and a pressure sensor 29 is connected via a hydraulic line 28. The operating device 26 converts the hydraulic pressure (primary hydraulic pressure) supplied through the pilot line 25 into a hydraulic pressure (secondary hydraulic pressure) corresponding to the operation amount of the operator and outputs the hydraulic pressure. The secondary hydraulic pressure output from the operating device 26 is supplied to the control valve 17 through the hydraulic line 27 and detected by the pressure sensor 29.

  When an operation for turning the turning mechanism 3 is input to the operating device 26, the pressure sensor 29 detects this operation amount as a change in the oil pressure in the hydraulic line 28. The pressure sensor 29 outputs an electrical signal indicating the hydraulic pressure in the hydraulic line 28. This electric signal is input to the controller 30 and used for driving control of the turning electric motor 21.

  The controller 30 is configured by an arithmetic processing unit including a CPU (Central Processing Unit) and an internal memory, and is realized by the CPU executing a drive control program stored in the internal memory. The controller 30 receives operation inputs from various sensors, the operation device 26, and the like, and performs drive control of the inverters 18A, 18B, 18C, the power storage means 100, and the like.

  Here, with reference to FIG. 3 again, the buck-boost converter 102 in this embodiment will be described in detail. FIG. 3 schematically shows the circuit configuration of the buck-boost converter 102. The step-up / down converter 102 includes a reactor 102A, transistors 102B and 102C, and a smoothing capacitor 102D. The transistors 102B and 102C constitute a second switching element in the present invention. The transistors 102B and 102C are composed of, for example, an IGBT (Insulated Gate Bipolar Transistor) and are connected in series with each other. Specifically, the collector of the transistor 102B and the emitter of the transistor 102C are connected to each other, the emitter of the transistor 102B is connected to the negative terminal of the battery 101 and the negative side wiring of the DC bus 103, and the collector of the transistor 102C is DC It is connected to the positive side wiring of the bus 103. Reactor 102A has one end connected to the collector of transistor 102B and the emitter of transistor 102C, and the other end connected to the positive terminal of battery 101. A PWM voltage is applied to the gates of the transistors 102B and 102C in accordance with a control signal generated by a CPU 102E (see FIG. 5) (second CPU) provided in the buck-boost converter 102. The transistors 102B and 102C are switching-controlled by this PWM voltage. The CPU 102E is controlled by a control signal from the controller 30. Note that a diode 102b, which is a rectifying element, is connected in the reverse direction between the collector and emitter of the transistor 102B. Similarly, a diode 102c is connected in the reverse direction between the collector and emitter of the transistor 102C. The smoothing capacitor 102D is connected between the collector of the transistor 102C and the emitter of the transistor 102B, and smoothes the output voltage from the buck-boost converter 102.

  In the buck-boost converter 102 having such a configuration, when supplying DC power from the battery 101 to the DC bus 103, a PWM voltage is applied to the gate of the transistor 102B, and the reactor 102A is turned on / off of the transistor 102B. Is transmitted through the diode 102c, and this power is smoothed by the capacitor 102D. When supplying DC power from the DC bus 103 to the battery 101, a PWM voltage is applied to the gate of the transistor 102C, and the current output from the transistor 102C is smoothed by the reactor 102A.

  Next, inverters 18A, 18B, and 18C will be described in detail with reference to FIG. FIG. 4 schematically shows the circuit configuration of the inverter 18, and the inverters 18A, 18B, and 18C have, for example, a circuit configuration like the inverter 18 shown in FIG.

  The inverter 18 has a power input end 181 and a drive power output end 182 that is electrically connected to each AC motor M and supplies an AC power supply voltage to each AC motor M. Here, the motor generator 12, the turning motor 21, and the boom regeneration generator 300 of the present embodiment correspond to the AC motor M. The positive input terminal and the negative input terminal of the power input terminal 181 are connected to the positive wiring and the negative wiring of the DC bus 103, respectively.

  The circuit of the inverter 18 is constituted by a three-phase inverter bridge. That is, the circuit of the inverter 18 is formed by connecting three sets (bridges) of two transistors 183A and 183B connected in series in parallel, and the collector of the transistor 183A is connected to the DC power supply line on the positive voltage side. The emitter of the transistor 183B is connected to the DC power supply line on the negative voltage side. A connection point between the emitter of the transistor 183A and the collector of the transistor 183B is connected to the power input terminal of the AC motor M. A diode is connected in reverse direction in parallel with each transistor. A smoothing capacitor 184 is provided between the DC power supply line on the positive voltage side and the DC power supply line on the negative voltage side. The transistors 183A and 183B in the inverter 18A constitute the first switching element in the present invention.

  A PWM voltage is applied to the gates of the transistors 183A and 183B in accordance with control signals generated by the CPUs 185A, 185B and 185C (see FIG. 5) provided in the inverter 18. The transistors 183A and 183B are switching-controlled by this PWM voltage. The CPUs 185A, 185B, and 185C are controlled by a control signal from the controller 30.

  Next, the arrangement of each component shown in FIG. 2 will be described with reference to FIG. FIG. 5 is a schematic top view showing the arrangement of components included in the excavator 1.

  As shown in FIG. 5, the excavator 1 includes a right endless track 2a, a left endless track 2b, and a boom 5 as a traveling mechanism 2, and the upper direction in the drawing is a traveling direction during forward movement.

  A cab 4a is provided on the left side of the boom 5, and an operating device 26 and a controller 30 are provided in the cab 4a. The operating device 26 receives a driving operation by the driver and sends a control signal based on the driving operation content to the controller 30. The controller 30 is disposed adjacent to the operating device 26, and includes a CPU 30a for controlling the inverters 18A, 18B, 18C and the step-up / down converter 102. A control signal from the CPU 30a is transmitted in series to the CPU 185C, the CPU 102E, and the CPU 185A via the control signal line 30b.

  Since the controller 30 is disposed adjacent to the operation device 26, the wiring between the controller 30 and the operation device 26 can be shortened, so that noise resistance and reliability can be improved. Further, since the controller 30 is provided in the cab 4a, it is possible to provide electronic components such as the CPU 30a at a temperature suitable for operation.

  A battery 101 and a step-up / down converter 102 are provided on the right side of the boom 5. The buck-boost converter 102 is disposed adjacent to the battery 101, and the buck-boost converter 102 and the battery 101 are connected by two strong electric wires. Since the buck-boost converter 102 is disposed adjacent to the battery 101, the wiring between the buck-boost converter 102 and the battery 101 can be shortened.

  The buck-boost converter 102 includes a CPU 102E and a terminal block 103a for switching control of the transistors 102B and 102C. The terminal block 103a is connected to a DC bus 103 which is a positive and negative DC wiring. The terminal block 103a and the DC bus 103 constitute a DC voltage bus part 103b, and the DC bus 103 constitutes a constant voltage storage part. The DC power output from the buck-boost converter 102 is supplied to the inverters 18A, 18B, and 18C via the DC bus 103.

  As shown in FIG. 5, the inverter 18 </ b> A is disposed adjacent to the motor generator 12. The inverter 18A and the motor generator 12 are connected by three strong electric wires, and the length of the wiring of the three strong electric wires is shortened by arranging the inverter 18A and the motor generator 12 adjacent to each other. can do. Further, by combining the inverter 18A and the motor generator 12 as a group, the group of these devices is transferred to the step-up / down converter 102 which is a DC power supply source via the DC bus 103 which is two strong electric wires. It can arrange freely. By disposing the inverter 18A away from the step-up / down converter 102, a wiring space for the DC bus 103 composed of “two strong electric wires” is required. However, the inverter 18A is a generator to be controlled (here, By arranging the motor generator 12) adjacent to the motor generator 12), the wiring space for "three strong electric wires" between the inverter 18A and the controlled object can be extremely reduced. Therefore, compared to the case where the inverter 18A and the step-up / down converter 102 are arranged adjacent to each other, the space for wiring can be reduced in the case where the inverter 18A and the motor generator 12 are arranged adjacent to each other. The effect of reducing the wiring space is the same for inverters 18B and 18C described later.

  The inverter 18A includes a CPU 185A (first CPU) for generating a signal for switching control of the transistors 183A and 183B included in the inverter 18A. By providing the CPU 185A in the inverter 18A, the wiring between the CPU 185A and the transistors 183A and 183B can be shortened, so that noise resistance and reliability are improved.

  The rotating shaft of the motor generator 12 is connected to the rotating shaft of the engine 11 and the main pump 14 via the speed reducer 13. A radiator 403 for cooling the inverters 18 </ b> A, 18 </ b> B, 18 </ b> C and the step-up / step-down converter 102 is provided in the vicinity of the engine 11, and the radiator 403 is cooled by a fan 410 connected to the engine 11.

  As shown in FIG. 5, the inverter 18 </ b> B is disposed adjacent to the boom regeneration generator 300. A hydraulic motor 310 is disposed adjacent to the boom regeneration generator 300. The inverter 18B and the boom regeneration generator 300 are connected by three strong electric wires, and the inverter 18B and the boom regeneration generator 300 are arranged adjacent to each other so that the wiring of the three strong wires can be reduced. The length can be shortened. In addition, by combining the inverter 18B and the boom regenerative generator 300 as a group, these devices are combined into a step-up / down converter as a DC power supply source via a DC bus 103, which is two strong wires. It can arrange | position freely with respect to 102. FIG.

  The inverter 18B includes a CPU 185B for generating a signal for switching control of the transistors 183A and 183B included in the inverter 18B. By providing the CPU 185B in the inverter 18B, the wiring between the CPU 185B and the transistors 183A and 183B can be shortened, so that noise resistance and reliability are improved.

  As shown in FIG. 5, the inverter 18 </ b> C is disposed adjacent to the turning electric motor 21. The inverter 18C and the turning electric motor 21 are connected by three strong electric wires, and the length of the wiring of the three strong electric wires is shortened by arranging the inverter 18C and the electric turning motor 21 adjacent to each other. can do. Further, by combining the inverter 18C and the turning electric motor 21 as a group, the group of these devices is transferred to the step-up / down converter 102 which is a DC power supply source via the DC bus 103 which is two strong electric wires. It can arrange freely.

  The inverter 18C includes a CPU 185C for generating a signal for switching control of the transistors 183A and 183B included in the inverter 18C. By providing the CPU 185C in the inverter 18C, the wiring between the CPU 185C and the transistors 183A and 183B can be shortened, so that noise resistance and reliability are improved.

  Since the transistors 102B and 102C of the step-up / down converter 102 control a large amount of power, the amount of heat generation becomes extremely large. In addition, the amount of heat generated in reactor 102A is also great. Therefore, the transistors 102B and 102C and the reactor 102A need to be cooled. Further, since the inverters 18A, 18B, and 18C also have high-power transistors like the buck-boost converter 102, they need to be cooled. Therefore, the excavator 1 of this embodiment includes a coolant circulation system for cooling the step-up / down converter 102 and the inverters 18A, 18B, and 18C. This coolant circulation system is used for cooling the motor generator 12, the boom regeneration generator 300, the turning motor 21, the battery 101, the controller 30 and the like in addition to the step-up / down converter 102 and the like. FIG. 6 shows an example of cooling water piping in the coolant circulation system.

  As shown in FIG. 6, the coolant circulation system includes a tank 400, a pump 401, a pump motor 402, and a radiator 403. The cooling water is stored in the tank 400 and is sent to the radiator 403 by the pump 401 driven by the pump motor 402. The cooling water cooled by the radiator 403 is sent to the inverter 18C, the inverter 18A, the step-up / down converter 102, the inverter 18B, and the controller 30 through piping.

  The cooling water sent to the inverter 18C is returned to the tank 400 via the turning electric motor 21 by piping. Here, since the inverter 18C is arranged adjacent to the turning electric motor 21, the piping of the cooling water between the inverter 18C and the turning electric motor 21 can be shortened.

  The cooling water sent to the inverter 18A is returned to the tank 400 via the motor generator 12 and the speed reducer 13 by piping. Here, since the inverter 18A is disposed adjacent to the motor generator 12, the piping of the cooling water between the inverter 18A and the motor generator 12 can be shortened.

  The cooling water sent to the step-up / down converter 102 is returned to the tank 400 via the battery 101 by piping. Here, since the step-up / down converter 102 is disposed adjacent to the battery 101, it is possible to shorten the piping of the cooling water between the step-up / down converter 102 and the battery 101.

  The cooling water sent to the inverter 18B is returned to the tank 400 via the boom regeneration generator 300 by piping. Here, since the inverter 18B is disposed adjacent to the boom regeneration generator 300, the piping of the cooling water between the inverter 18B and the boom regeneration generator 300 can be shortened.

  The cooling water pipe to the controller 30 is directly connected from the radiator 403. Thereby, since the cooling performance with respect to CPU in the controller 30 can be ensured, the reliability of the shovel 1 is ensured. In FIG. 6, the controller 30, the inverters 18 </ b> A to 18 </ b> C, and the converter 102 are connected in parallel, but piping is connected so that the cooling water used for cooling the controller 30 is used for cooling the inverters 18 </ b> A to 18 </ b> C and the converter. Also good.

  Next, an excavator 1 according to another embodiment of the hybrid construction machine will be described. FIG. 7 is a block diagram showing an internal configuration such as an electric system and a hydraulic system of the excavator 1 according to another embodiment.

  In the configuration shown in FIG. 7, a pump motor 140 and an inverter 18 </ b> D are provided in place of the reduction gear 13 and the main pump 14 being connected in the configuration shown in FIG. 2 (so-called parallel system). The configuration shown in FIG. 7 is called a series system, and converts all the motive power of the engine 11 into electrical energy to drive various drive elements.

  The inverter 18 </ b> D is electrically connected to the power storage unit 100 by the DC bus 103 and controlled by the controller 30. The output terminal of the inverter 18D is connected to the pump motor 140, and the pump motor 140 is driven and controlled by the inverter 18D. In addition, the electric power generated by the main pump 14 in the pump motor 140 is supplied as regenerative energy to the power storage means 100 via the inverter 18D.

  Next, the arrangement of the components shown in FIG. 7 will be described with reference to FIG. FIG. 8 is a schematic top view showing the arrangement of components included in the excavator 1, and corresponds to FIG.

  As shown in FIG. 8, the inverter 18 </ b> D is disposed adjacent to the pump motor 140. The inverter 18D and the pump motor 140 are connected by three strong wires, and the inverter 18D and the pump motor 140 are arranged adjacent to each other, so that the length of the three strong wires is shortened. can do. The inverter 18D is supplied with DC power from the step-up / down converter 102 via the DC bus 103. By arranging the inverter 18D and the pump motor 140 adjacent to each other as a unit, the unit of these devices can be freely arranged with respect to the step-up / down converter 102 which is a DC power supply source.

  The inverter 18D includes a CPU 185D for generating a signal for switching control of the transistors 183A and 183B included in the inverter 18D. Since the CPU 185D is provided in the inverter 18D, the wiring between the CPU 185D and the transistors 183A and 183B can be shortened, so that noise resistance and reliability are improved.

  In the above embodiment, the excavator 1 is shown as an example of the hybrid type construction machine according to the present invention, but other examples of the hybrid type construction machine of the present invention include a lifting magnet vehicle, a wheel loader, a crane, and the like. Can be mentioned.

  DESCRIPTION OF SYMBOLS 1 ... Excavator, 2 ... Traveling mechanism, 2A, 2B ... Hydraulic motor, 2a ... Right endless track, 2b ... Left endless track, 3 ... Turning mechanism, 4 ... Turning body, 4a ... Driver's cab, 5 ... Boom, 6 ... Arm 7 ... Boom cylinder, 7A ... Hydraulic pipe, 8 ... Arm cylinder, 9 ... Bucket cylinder, 10 ... Bucket, 11 ... Engine, 12 ... Motor generator, 13 ... Reducer, 14 ... Main pump, 15 ... Pilot pump, DESCRIPTION OF SYMBOLS 16 ... High pressure hydraulic line, 17 ... Control valve, 18, 18A, 18B, 18C, 18D ... Inverter, 21 ... Electric motor for turning, 21A ... Rotary shaft, 22 ... Resolver, 23 ... Mechanical brake, 24 ... Turning reduction gear, 25 ... Pilot line, 26 ... Operating device, 27 ... Hydraulic line, 28 ... Hydraulic line, 29 ... Pressure sensor, 30 ... Controller, 30b ... Control signal line DESCRIPTION OF SYMBOLS 100 ... Power storage means, 101 ... Battery, 102 ... Buck-boost converter, 102A ... Reactor, 102B, 102C ... Transistor, 102D ... Smoothing capacitor, 102b ... Diode, 102c ... Diode, 103 ... DC bus, 103a ... Terminal block, 103b DESCRIPTION OF SYMBOLS ... DC voltage bus part, 140 ... Electric motor for pumps, 181 ... Power supply input terminal, 182 ... Driving power output terminal, 183A, 183B ... Transistor, 184 ... Smoothing capacitor, 300 ... Generator for boom regeneration, 310 ... Hydraulic motor, 400 ... Tank, 401 ... Pump, 402 ... Pump motor, 403 ... Radiator, 410 ... Fan.

Claims (6)

An AC motor generator connected to the internal combustion engine;
A first drive control means for driving and controlling the AC motor generator connected to the AC motor generator by three strong wires ;
A storage battery for supplying power to the AC motor generator via a storage control means ;
And said power storage control means for controlling the charging and discharging of the storage battery is connected to the first drive control means through the DC bus of the two strong electric wire,
With
The power storage control means is disposed adjacent to the storage battery,
The hybrid construction machine, wherein the first drive control means is disposed adjacent to the AC motor generator so that the three strong electric wires are shorter than the two strong electric wires . The first drive control means includes
A first switching element for generating a signal for driving and controlling the AC motor generator;
The hybrid construction machine according to claim 1, further comprising: a first CPU for generating a signal for switching control of the first switching element. The power storage control means includes
A second switching element for generating a signal for controlling charge / discharge of the storage battery;
The hybrid construction machine according to claim 1, further comprising: a second CPU for generating a signal for switching control of the second switching element. A traveling mechanism;
A revolving body provided rotatably on the upper part of the traveling mechanism via a revolving mechanism;
A turning electric motor that is powered by the storage battery and drives the turning mechanism;
Second drive control means for driving and controlling the turning electric motor,
The hybrid type construction machine according to any one of claims 1 to 3, wherein the second drive control means is disposed adjacent to the turning electric motor. A boom coupled to the work element for moving the work element;
A boom regenerative generator that performs a regenerative operation by the operation of the boom, and supplies power generated by the regenerative operation to the storage battery;
A third drive control means for controlling the boom regeneration generator;
The hybrid construction machine according to any one of claims 1 to 4, wherein the third drive control means is disposed adjacent to the boom regeneration generator. A controller for transmitting a control signal for controlling the first drive control means and the power storage control means;
Operation means for receiving a driving operation and sending a control signal based on the driving operation content to the controller;
With
The hybrid construction machine according to any one of claims 1 to 5, wherein the controller is disposed adjacent to the operation means.

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