JP5957475B2 - Hybrid construction machine - Google Patents

Description

  The present invention relates to a hybrid construction machine having two types of power sources, for example, an engine and a generator / motor, and appropriately using these two types of power sources depending on the situation.

  A hydraulic excavator, which is a typical example of a construction machine, is hybridized by providing two types of power sources, that is, an engine and a power generation / motor, in order to improve fuel consumption, clean exhaust gas, and the like.

  The hybrid hydraulic excavator includes a self-propelled lower traveling body, an upper revolving body mounted on the lower traveling body via a revolving device using a power generator / motor for turning as a power source, and the upper revolving body It is comprised by the working apparatus provided in the front side of the revolving body so that it can be moved up and down using a hydraulic actuator as a power source.

  On the other hand, the upper swing body includes a swing frame that forms a support structure, a counterweight that is attached to a rear end of the swing frame and that balances the weight of the working device, and is positioned on the front side of the counterweight. Connected to the engine and the hydraulic pump, mounted on the rear side of the frame in a horizontally installed state extending in the left and right directions, a hydraulic pump driven by the engine and supplying pressure oil to the hydraulic actuator A power generator / motor for assisting, a floor member provided on the left side of the swivel frame on the front side of the engine and having a driver's seat on which an operator sits, and fuel or hydraulic oil provided on the right side of the swivel frame and storing fuel or hydraulic oil therein Power is supplied to the oil storage tank, the turning generator / motor and the assist generator / motor, and Use the generator-motor and includes a power storage device that performs the receiving of power from said assisting motor-generator (e.g., see Patent Document 1, Patent Document 2).

JP 2002-227241 A JP 2010-270554 A

  By the way, the hydraulic excavator has a small hydraulic excavator called a mini excavator in which the operating mass as a total weight during operation is set to less than 6 tons. In this small hydraulic excavator, the upper swing body is downsized. Yes. In particular, even in small hydraulic excavators, a rear ultra-small swivel type that is configured so that the upper revolving unit can swivel within the vehicle width dimension of the lower traveling unit so that it can swivel in a narrow work site. In a hydraulic excavator called a small turning type, the upper turning body is further miniaturized.

  Here, when a hydraulic excavator is hybridized, it is desirable to newly develop a dedicated machine. However, in order to provide hybrid hydraulic excavators to the market at an early stage, it is possible to use existing hydraulic excavators and mount various electrical components such as power generators / motors, power storage devices, etc. Changing the design in this way is a shortcut to hybridization.

  On the other hand, in the existing small hydraulic excavators, the upper swing body is further miniaturized as described above, so various electric parts for hybridization are placed around the engine, hydraulic pump, oil storage tank, etc. There is a problem that it is difficult to install.

  In particular, the power storage device needs to secure a power capacity for long-time operation and be cooled in order to suppress a temperature rise. For this reason, since the power storage device has a limited mounting position, it becomes an obstacle when a small hydraulic excavator is hybridized.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to allow a power storage device to be hybridized to the upper swing body to be easily mounted even in a small upper swing body. It is to provide a hybrid construction machine.

  A hybrid construction machine according to the present invention includes a self-propelled lower traveling body, an upper revolving body mounted on the lower traveling body through a swivel device using a power generator / motor for turning as a power source, The upper swing body includes a working device provided on the front side of the upper swing body so as to be movable up and down using a hydraulic actuator as a power source. The upper swing body is attached to a swing frame forming a support structure and a rear end portion of the swing frame. A counterweight that balances the weight with the working device, an engine that is mounted on the front side of the counterweight and that is mounted horizontally in a left-right direction on the rear side of the revolving frame, and the engine A hydraulic pump that is driven by the hydraulic pump to supply pressure oil to the hydraulic actuator, an assisting generator / motor connected to the engine and the hydraulic pump, and a front of the engine And a floor member provided on one side of the swivel frame in the left and right directions and having a driver's seat on which an operator is seated, and an oil storage tank provided on the other side of the swivel frame in the left and right directions and storing fuel or hydraulic oil therein. A tank, and a power storage device that supplies electric power to the turning generator / motor and the assist generator / motor and receives electric power from the turning generator / motor and the assist generator / motor. It becomes.

  In order to solve the above-described problem, the feature of the configuration adopted by the invention of claim 1 is that a power storage device accommodation space extending in the front, rear, upward, and downward directions between the floor member and the oil storage tank. The power storage device is arranged in the power storage device accommodation space.

  According to a second aspect of the present invention, a partition cover extending in the front and rear directions along the oil storage tank is provided in the power storage device accommodation space, and the power storage device is formed between the floor member and the partition cover. In other words, the power storage device housing space is arranged.

  According to a third aspect of the present invention, the power storage device is formed in a box shape extending frontward, rearward, upward, and downward in the power storage device accommodation space, and a rear plate of the power storage device is provided in the power storage device. An intake port for sucking cooling air is provided, and a front plate of the power storage device is provided with an exhaust port for discharging the cooling air sucked into the power storage device.

  According to a fourth aspect of the present invention, the power storage device is provided with a disconnect switch that energizes or shuts off the power storage device and the turning power generator / motor and the assist power generator / motor. It is in.

  According to a fifth aspect of the present invention, a power storage device pedestal that is positioned in the power storage device accommodation space and extends in the front and rear directions is attached to the revolving frame, and the power storage device is attached to an upper surface of the power storage device pedestal. It is in the configuration.

  According to the first aspect of the present invention, the power storage device accommodation space is formed between the floor member and the oil storage tank, and the power storage device is arranged in the power storage device accommodation space. Therefore, the power storage device required when the construction machine is hybridized can be easily mounted on the upper swing body using the power storage device accommodation space.

  As a result, the existing construction machine can be utilized and the construction machine can be hybridized without changing the arrangement of devices such as the engine and the oil storage tank disposed in the upper swing body. Further, since the power storage device accommodation space is a space opened upward or forward, the power storage device can be easily detached, so that the workability of the power storage device assembly work and maintenance work can be improved.

  According to the invention of claim 2, the partition cover is provided between the power storage device and the oil storage tank. Thereby, since the partition cover can shield the heat of the oil storage tank from the power storage device, the performance and life of the power storage device can be improved.

  According to the invention of claim 3, since the cooling air introduced into the power storage device is discharged from the exhaust port provided on the front side of the power storage device, the upper part where a lot of dust is dancing due to the work of the work device and the like It is possible to suppress dust and the like from entering the power storage device from the front side of the revolving structure. Thereby, the performance and life of the power storage device can be improved.

  According to the invention of claim 4, since the power storage device is provided with the disconnect switch, the power storage device and the power storage device when an abnormality occurs in the electrical system of the power generation device / motor for turning and the power generation / motor for assisting The power supply from can be stopped. In addition, power supply can be stopped during maintenance work. Thereby, the reliability and safety of the hybrid function can be improved. In addition, since the disconnect switch is provided in the power storage device, the high-voltage current cable (electric wire) connecting the disconnect switch and the power storage device can be shortened, and the deterioration of the cable due to heat generation is suppressed, and the durability , Reliability can be improved. Further, since the disconnect switch can be attached (subassembled) in advance to the power storage device, the assembly workability can be improved.

  According to the invention of claim 5, the power storage device is attached to the upper surface of the base for the power storage device provided on the turning frame. Thus, the power storage device can be mounted on a dedicated pedestal, so that the power storage device can be easily attached and detached. Therefore, the workability of the power storage device assembly work and maintenance work can be improved.

1 is a side view showing a hybrid excavator according to an embodiment of the present invention. It is a front view which shows the hybrid type hydraulic excavator which abbreviate | omitted the working device. It is a top view which shows the hybrid type hydraulic excavator which abbreviate | omitted the working apparatus and the exterior cover. It is a side view which expands and shows the upper turning body which abbreviate | omitted the floor member, the cab box, etc. It is a perspective view which shows the upper revolving body which abbreviate | omitted the cab box, the driver's seat, etc. It is a perspective view which shows the upper revolving body which abbreviate | omitted the floor member in FIG. It is a disassembled perspective view which shows the state which removed the electrical storage apparatus in FIG. FIG. 8 is an exploded perspective view illustrating a state in which the power storage device in FIG. 7 is omitted and a right front cover, a partition cover, a heat exchanger cover, and an electrical component unit are removed. It is sectional drawing of the principal part expansion which shows the flow of the cooling air with respect to an electrical storage apparatus. It is a front view which shows an electrical storage apparatus from the front side. It is a rear view which shows an electrical storage apparatus from the rear side. It is a block diagram which shows the operation system of a hybrid type hydraulic shovel.

  Hereinafter, as a hybrid construction machine according to an embodiment of the present invention, a hybrid hydraulic excavator using an engine and a generator / motor together as a power source will be described as an example, and will be described in detail with reference to FIGS. .

  In FIG. 1, reference numeral 1 denotes a hybrid hydraulic excavator as a typical example of a hybrid construction machine. This hybrid hydraulic excavator 1 (hereinafter referred to as hydraulic excavator 1) is called a mini excavator having an operating mass of less than 6 tons, for example, and the rear part of the upper revolving body 4 is within the vehicle width dimension of the lower traveling body 2 during the turning operation. It is configured as a hydraulic excavator of the rear ultra-small turning type that fits in

  As shown in FIGS. 1 to 3, the hydraulic excavator 1 includes a crawler-type lower traveling body 2 capable of self-running, a turning device 3 provided on the lower traveling body 2, and the lower traveling body 2. The upper turning body 4 is mounted so as to be turnable via the turning device 3, and the working device 5 is provided on the front side of the upper turning body 4 so as to be able to move up and down, and performs excavation work of earth and sand. .

  The lower traveling body 2 includes a track frame 2A, drive wheels 2B provided on the left and right sides of the track frame 2A, and the front and rear sides of the drive wheel 2B. An idler wheel 2C provided on both the left and right sides (both shown only on the left side) and a crawler belt 2D wound between the drive wheel 2B and the idler wheel 2C are configured. The left and right drive wheels 2B are rotationally driven by left and right traveling motors 2E and 2F (see FIG. 12), which are hydraulic motors, so that the lower traveling body 2 can be self-propelled. On the other hand, on the upper side of the central portion of the track frame 2A, a large-diameter and short cylindrical body 2G is provided, and the turning device 3 is attached on the cylindrical body 2G.

  The working device 5 includes a boom 5A attached to a revolving frame 6 to be described later so as to be able to move up and down, an arm 5B attached to the tip of the boom 5A so as to be able to move up and down, and rotatable to the tip of the arm 5B. And a boom cylinder 5D, an arm cylinder 5E, and a bucket cylinder 5F which are hydraulic cylinders as hydraulic actuators for driving the bucket 5C.

  The upper swing body 4 is mounted with a swing frame 6 (described later) on the lower traveling body 2 via the swing device 3 so as to be freely swingable. On the swing frame 6, a counterweight 7, an engine 11, and a hydraulic pump 13 (described later). , Generator / motor 14 for assist, generator / motor 15 for turning, floor member 16, inverter 24 for turning, inverter 26 for assisting, contactor box 27, hydraulic oil tank 29, fuel tank 31, power storage device 37, and the like. Yes.

  Reference numeral 6 denotes a revolving frame that forms a support structure for the upper revolving structure 4. As shown in FIG. 6, the revolving frame 6 includes a bottom plate 6A extending in the front and rear directions, and a left vertical plate standing on the bottom plate 6A so as to extend in the front and rear directions with an interval left and right. 6B, a right vertical plate 6C, a left side frame 6D that is bent and extended rearward from the front end portion of the bottom plate 6A, and is bent and extended rearward while extending rightward from the front end portion of the bottom plate 6A. A right side frame 6E, a rear horizontal plate 6F erected on the bottom plate 6A in a left and right direction in a state of being fixed to the rear ends of the vertical plates 6B and 6C, and the vertical plates 6B. , 6C and a support bracket 6G provided on the front side. The support bracket 6G is provided so as to protrude forward from the bottom plate 6A, and the working device 5 is attached to the distal end side so as to be swingable in the left and right directions.

  Reference numeral 7 denotes a counterweight attached to the rear end portion of the revolving frame 6. This counterweight 7 balances the weight with the working device 5 and has a convex curved shape protruding rearward. A floor mounting bracket 8 constituting a part of the counterweight 7 is provided on the front side of the upper surface of the counterweight 7. A floor member 16 and an electrical component mounting bracket 20, which will be described later, are mounted on the floor mounting bracket 8.

  A heat exchanger cover 9 is provided on the right side of the floor mounting bracket 8 and extends from the counterweight 7 to the front side. The heat exchanger cover 9 includes an upper surface portion 9A that covers the upper side of the heat exchanger 12, which will be described later, an inclined portion 9B that extends obliquely downward from the front side of the upper surface portion 9A, and a lower side from the lower end side of the inclined portion 9B. The front surface portion 9C extends toward the front and covers the front side of the heat exchanger 12, and the lower side of the front surface portion 9C is attached to, for example, a rear position of a power storage device base 34 described later. Further, the front surface portion 9C closes the rear side of the power storage device accommodation space 32 described later.

  Reference numeral 10 denotes an upper power storage device mounting member provided on the upper end side of the front surface portion 9C of the heat exchanger cover 9 (see FIGS. 7 and 9). The upper power storage device mounting member 10 is a rear portion of the power storage device 37 described later. A bracket 38H is attached. The upper power storage device mounting member 10 has an inverted U-shaped U-shaped plate 10A whose rear surface is mounted on the front surface portion 9C of the heat exchanger cover 9 by bolts, and the left and right directions on the front surface of the U-shaped plate 10A. The anti-vibration member 10B is provided with a space between the two anti-vibration members 10B and an inverted L-shaped plate 10C attached to the front surface of the anti-vibration member 10B.

  As shown in FIG. 7, a bolt insertion hole 10C2 through which a bolt / nut 40 for attaching a rear bracket 38H of a power storage device 37 to be described later is inserted in the upper surface plate portion 10C1 of the L-shaped plate 10C in the left and right directions. Two pieces are provided apart from each other. Further, the vibration isolating member 10 </ b> B is made of an elastic member such as rubber, and the power storage device 37 to be described later is thereby attached to the heat exchanger cover 9 in a vibration isolating state.

  Reference numeral 11 denotes an engine provided on the revolving frame 6 located on the front side of the counterweight 7. The engine 11 is mounted on the rear side of the revolving frame 6 in a horizontally placed state extending in the left and right directions. The engine 11 is provided with an exhaust pipe 11A for discharging exhaust gas, and the exhaust pipe 11A is provided with a muffler 11B located on the left side of the engine 11 (see FIG. 8). The muffler 11B is provided to reduce the noise of the exhaust gas. In addition to this, when the output of the engine 11 exceeds the set value of the exhaust gas regulation, the muffler 11B is changed to an exhaust gas aftertreatment device to remove harmful substances in the exhaust gas discharged from the engine 11. can do. On the other hand, a heat exchanger 12 including a radiator, an oil cooler and the like is disposed on the right side of the engine 11.

  Here, the performance (output) of the engine 11 will be described. The hybrid hydraulic excavator 1 selects and drives an engine 11, an assist generator / motor 14 and a turning generator / motor 15 described later according to the operation thereof. For example, in a heavy load state such as excavation, the hydraulic pump 13 described later is driven by the output of the engine 11 and the assisting generator / motor 14 is driven by the electric power of the power storage device 37 described later to assist the engine 11. On the other hand, for example, in a light load state, the surplus output of the engine 11 is stored in the power storage device 37 in place of the power by the assisting generator / motor 14. Therefore, the engine 11 is assisted by the assisting generator / motor 14, and therefore the output can be reduced. As a result, the engine 11 can be reduced in size, and equipment related to the engine 11, such as the muffler 11B (exhaust gas aftertreatment device), the heat exchanger 12, and the like can be reduced in size.

  Reference numeral 13 denotes a hydraulic pump provided on the left side of the engine 11. The hydraulic pump 13 is provided with an input shaft coaxial with the output shaft of the engine 11 and is driven by the engine 11. Thus, the hydraulic pump 13 supplies pressure oil to the traveling motors 2E, 2F of the lower traveling body 2 and the cylinders 5D, 5E, 5F of the working device 5. That is, the hydraulic pump 13 pressurizes and discharges hydraulic oil as a power source for driving the traveling motors 2E, 2F of the lower traveling body 2 and the cylinders 5D, 5E, 5F of the work device 5. is there.

  Reference numeral 14 denotes an assist generator / motor which is located on the left side of the engine 11 and connected to the engine 11 and the hydraulic pump 13. The assist generator / motor 14 is connected to the output shaft of the engine 11 and the input shaft of the hydraulic pump 13, and generates electric power by being rotationally driven by the engine 11, or assists the driving of the hydraulic pump 13 in addition to the engine 11. To do. The assist generator / motor 14 is electrically connected to an assist inverter 26 via a three-phase AC cable 25 described later.

  Reference numeral 15 denotes a turning generator / motor constituting a power source of the turning device 3. This turning power generator / motor 15 is composed of an electric motor attached to a substantially central portion of the bottom plate 6A of the turning frame 6, and has a gear (not shown) that meshes with the turning device 3 via a speed reduction mechanism 15A. Yes. The turning generator / motor 15 turns the upper turning body 4 on the lower traveling body 2 via the turning device 3 by rotationally driving the gears by feeding power from a power storage device 37 described later. On the other hand, the turning generator / motor 15 can store the regenerative energy generated when the turning operation is decelerated in the power storage device 37. The turning generator / motor 15 is electrically connected to the turning inverter 24 via a three-phase AC cable 25.

  Reference numeral 16 denotes a floor member provided on the front side of the engine 11 and on the left side on one side of the left and right directions on the revolving frame 6. The floor member 16 has a driver's seat 17 (described later) on which an operator is seated, and the front end position can be tilted to the front end position of the revolving frame 6 via a tilt support member (not shown) (tilt up, tilt down). Supported). On the other hand, the rear position of the floor member 16 is supported by the upper portion of the counterweight 7. As shown in FIG. 5, the floor member 16 is located on the front side, a footrest portion 16A on which an operator puts his / her foot, a rising portion 16B rising upward from a rear portion of the footrest portion 16A, and the rising portion 16B. A driver seat mounting portion 16C extending rearward from the upper side of the engine 11 toward the upper side of the engine 11, a back plate portion 16D extending diagonally upward from the rear portion of the driver seat mounting portion 16C, and a rear side from the upper side of the back plate portion 16D A mounting plate portion 16E extending to the side, and a wall plate portion 16F erected so as to extend forward and rearward on the right side of the footrest portion 16A, the rising portion 16B, the driver seat mounting portion 16C, and the back plate portion 16D. It is configured to include.

  Further, a lever / pedal mounting portion 16G is provided on the front side of the footrest portion 16A, and an operating lever / pedal 19 for traveling, which will be described later, is provided on the lever / pedal mounting portion 16G. Tilt support members (not shown) are attached to the lower surface side of the lever / pedal attachment portion 16G with a spacing in the left and right directions. Thereby, the floor member 16 can tilt up or down on the rear side with the tilt support member as the tilt center. In a state where the floor member 16 is tilted down, the rear mounting plate portion 16E can be bolted to the floor mounting bracket 8 of the counterweight 7.

  Reference numeral 17 denotes a driver seat (see FIG. 2) provided on a driver seat mounting portion 16C constituting the floor member 16, and this driver seat 17 is seated by an operator. On the left and right sides of the driver's seat 17, work operating levers 18 for operating the work device 5 and the like are disposed. Further, the lever / pedal mounting portion 16G of the floor member 16 in front of the driver's seat 17 is provided with an operation lever / pedal 19 for traveling that is operated by manual operation or stepping operation when the lower traveling body 2 is traveled. ing.

  An electrical component mounting bracket 20 is provided on the revolving frame 6 and is located on the front side of the engine 11 (see FIGS. 6 and 7). The electrical component mounting bracket 20 is disposed between the engine 11 and the floor member 16 and includes a main bracket 21, an upper mounting portion 22, and a lower mounting portion 23, which will be described later.

  The main bracket 21 forms a main body portion of the electrical component mounting bracket 20, and the main bracket 21 includes a vertical plate 21A covering the front side of the engine 11 and an upper portion of the vertical plate 21A as shown in FIG. A lateral plate 21B extending to the rear side, an upper mounting allowance 21C extending upward from the rear portion of the lateral plate 21B, a lower mounting allowance 21D extending from the lower portion of the vertical plate 21A to the front side, the vertical plate 21A, The face plate 21B and the right face plate 21E fixed to the right end edge of each mounting allowance 21C, 21D are configured in a step shape.

  A turning inverter 24, an assisting inverter 26, and a contactor box 27, which will be described later, are attached to the vertical plate 21A with bolts or the like. The upper attachment allowance 21C is attached to an upper attachment portion 22 described later, and the lower attachment allowance 21D is attached to a lower attachment portion 23 described later.

  The upper mounting portion 22 is disposed at an upper position of the electrical component mounting bracket 20, and the upper mounting portion 22 is formed as a substantially rectangular plate that is long in the left and right directions. The upper side of the upper mounting portion 22 is mounted on the floor mounting bracket 8 constituting the counterweight 7. On the other hand, the lower side of the upper attachment portion 22 is attached to the upper attachment allowance 21C of the main bracket 21 via a plurality of vibration isolation members 22A provided to be separated in the left and right directions (FIGS. 4 and 8). reference). Accordingly, the main bracket 21 is attached to the upper attachment portion 22 in a vibration-proof state.

  The lower mounting portion 23 is disposed at a lower position of the electrical component mounting bracket 20, and the lower mounting portion 23 is formed in an angle shape from the horizontal plate 23A and the vertical plate 23B. In the lower attachment portion 23, the vertical plate 23 </ b> B is attached to the rear horizontal plate 6 </ b> F of the revolving frame 6 with bolts or the like. On the other hand, the horizontal plate 23A of the lower attachment portion 23 is attached to the lower attachment allowance 21D of the main bracket 21 via a plurality of vibration isolation members 23C provided to be separated in the left and right directions (FIG. 6, FIG. (See FIG. 8). Accordingly, the main bracket 21 is attached to the lower attachment portion 23 in a vibration-proof state.

  Reference numeral 24 denotes a turning inverter electrically connected to the generator / motor 15 for controlling the generator / motor 15 for turning. This turning inverter 24 is attached to the main bracket 21 of the electrical component mounting bracket 20, specifically, the right side position of the vertical plate 21 </ b> A of the main bracket 21 on the power storage device 37 side described later. As a result, the turning inverter 24 is located immediately behind the turning generator / motor 15 disposed at substantially the center position of the turning frame 6, that is, compared to the assist inverter 26 described later. It is arranged at a close position.

  The turning inverter 24 is configured by combining a plurality of switching elements (not shown) and the like. When the turning power generator / motor 15 is regenerated, the turning inverter 24 converts the AC regenerative power generated by the turning power generator / motor 15 into DC power and supplies it to a power storage device 37 described later. On the other hand, when the turning power generator / motor 15 is driven to turn, the DC power from the power storage device 37 is converted into AC drive power and supplied to the turning power generator / motor 15.

  The turning inverter 24 is connected to the turning generator / motor 15 using a three-phase AC cable 25 (see FIG. 12). In this case, since the turning inverter 24 and the turning generator / motor 15 are arranged at positions close to each other so as to face each other in the front and rear directions, the length of the three-phase AC cable 25 is made as short as possible. Can be formed.

  An assist inverter 26 is electrically connected to the generator / motor 14 in order to control the assist generator / motor 14. The assist inverter 26 is mounted on the vertical plate 21 </ b> A of the main bracket 21 side by side on the left side of the turning inverter 24 (the side away from the power storage device 37). Thus, the assist inverter 26 is disposed closer to the assist generator / motor 14 disposed on the left side of the engine 11 than the turning inverter 24.

  The assist inverter 26 is configured by combining a plurality of switching elements (not shown) and the like, like the turning inverter 24. When the assist generator / motor 14 generates electric power, the assist inverter 26 converts AC power generated by the assist generator / motor 14 into DC power and supplies it to a power storage device 37 described later. On the other hand, when the assist generator / motor 14 is driven, the assist inverter 26 converts the DC power from the power storage device 37 into AC drive power and supplies it to the assist generator / motor 14.

  The assist inverter 26 is connected to the assist generator / motor 14 using a three-phase AC cable 25, as in the above-described swing inverter 24 and swing generator / motor 15 (see FIG. 12). Since the assist inverter 26 and the assist generator / motor 14 are arranged at close positions, the length of the three-phase AC cable 25 connecting them can be made as short as possible.

  Reference numeral 27 denotes a contactor box provided between the turning inverter 24 and the assisting inverter 26 and a power storage device 37 described later. The contactor box 27 is arranged at a left position farther from the power storage device 37 than the inverters 24 and 26. The contactor box 27 includes, for example, one main voltage transmission contactor, two inverter contactors corresponding to each of the inverters 24 and 26, a charging relay, and the like (both not shown). Among the contactors for each inverter, one of the contactors for inverter performs connection and disconnection between the turning inverter 24 and the power storage device 37. The other inverter contactor performs connection and disconnection between the assist inverter 26 and the power storage device 37.

  Reference numeral 28 denotes a cab box provided on the floor member 16. The cab box 28 is covered with a front plate 28A, a rear plate 28B, a left plate 28C, a right plate 28D, and a top plate 28E, and has a long lid. It is formed as a box body. The lower part of the cab box 28 is attached around the floor member 16. Instead of the cab box 28, a canopy in which a roof portion is provided on a support can be applied.

  Here, the floor member 16, the driver's seat 17, the operation lever 18 for operation, the operation lever / pedal 19 for traveling, the cab box 28, and the like are configured as one unit mounted on the turning frame 6. In this cab unit, the lever / pedal mounting portion 16G of the floor member 16 is tilted and supported left and right with a hinge structure having an axis extending in the left and right directions with respect to the front end portion of the revolving frame 6. It is attached via a member (not shown). Accordingly, the cab unit can tilt upward and downward on the rear side with the tilt support member positioned on the front side of the revolving frame 6 as a fulcrum.

  29 is a hydraulic oil tank as an oil storage tank. The hydraulic oil tank 29 is located on the right side which is the other side in the left and right direction of the revolving frame 6, specifically, on the right side located on the front side of the heat exchanger 12. It is provided in the vicinity of the frame 6E. The hydraulic oil tank 29 stores hydraulic oil supplied to the hydraulic pump 13. A control valve 30 (see FIG. 12) formed by a plurality of hydraulic control valves for controlling the traveling motors 2E, 2F of the lower traveling body 2 and the cylinders 5D, 5E, 5F of the work device 5 is a hydraulic pump. The pressure oil supplied from 13 is supplied to the hydraulic actuator in accordance with the operation of the operation levers 18 and 19 for work.

  31 is a fuel tank as an oil storage tank provided on the revolving frame 6 in the vicinity of the left front side of the hydraulic oil tank 29. The fuel tank 31 stores fuel supplied to the engine 11. The left side of the fuel tank 31 is a left surface portion 31A extending in the front and rear directions so as to face the wall plate portion 16F of the floor member 16 (the right surface plate 28D of the cab box 28).

  Reference numeral 32 denotes a power storage device accommodation space extending between the floor member 16 (cab box 28), the hydraulic oil tank 29, and the fuel tank 31 in the front, rear, upward, and downward directions (see FIGS. 2 and 3). ). The storage device housing space 32 is closed on the lower side by the revolving frame 6, on the rear side by the heat exchanger cover 9, on the left side by the wall plate 16 </ b> F of the floor member 16, and on the right side by the left surface 31 </ b> A of the fuel tank 31. Thus, the lower side, the left side, and the right side are surrounded, and the front and the upper side are formed as open spaces. Specifically, the power storage device accommodation space 32 is closed on the left side by the right surface plate 28D of the cab box 28 and on the right side by the left surface portion 33C2 of the partition cover 33C. In the power storage device accommodation space 32, a partition cover 33C, a power storage device base 34, a power storage device 37, and the like, which will be described later, are disposed.

  Reference numeral 33 denotes an exterior cover provided on the right side of the floor member 16, and the exterior cover 33 covers the heat exchanger 12, the hydraulic oil tank 29, the fuel tank 31, and the like. The exterior cover 33 is located on the rear side and covers the upper side of the heat exchanger 12. The right side cover 33 </ b> B is provided on the front side of the rear cover 33 </ b> A so as to be opened and closed, and covers the hydraulic oil tank 29 and the fuel tank 31. And a partition cover 33C provided to face the right surface plate 28D (wall plate portion 16F of the floor member 16) of the cab box 28 so as to cover the upper surface from the left surface portion 31A of the fuel tank 31.

  The partition cover 33 </ b> C is located in the power storage device accommodation space 32, extends forward and rearward along the fuel tank 31, and is fixed to the revolving frame 6 and / or the fuel tank 31. The partition cover 33 </ b> C includes a curved surface portion 33 </ b> C <b> 1 that covers the front and upper surfaces of the fuel tank 31 and is formed in a convex curve shape, and a left surface portion 33 </ b> C <b> 2 that covers the left surface portion 31 </ b> A of the fuel tank 31. In this case, the power storage device accommodation space 32 is formed between the left surface portion 33C2 and the floor member 16 (cab box 28). The partition cover 33 </ b> C blocks the heat of the fuel tank 31 from the power storage device 37 by partitioning between the fuel tank 31 and a power storage device 37 described later disposed in the power storage device accommodation space 32.

  A power storage device pedestal 34 is located in the power storage device accommodation space 32 and is attached to the revolving frame 6. The power storage device pedestal 34 is located in the front of the power storage device accommodation space 32 as shown in FIGS. , Extends backwards. Specifically, the power storage device pedestal 34 is formed as a box-shaped pedestal that extends from the front end of the right side frame 6E to the rear horizontal plate 6F at the upper position of the right vertical plate 6C. The upper surface of the power storage device pedestal 34 is a flat mounting surface portion 34A for mounting a power storage device 37, which will be described later, and a cable 44, which will be described later, is provided on the front surface portion 34B extending downward from the front end of the mounting surface portion 34A. An opening 34C for passing through is formed.

  In this case, since the mounting position of the power storage device 37 to be described later is located above the turning frame 6 by the power storage device base 34, the power storage device 37 can be easily attached and detached. Further, since the power storage device pedestal 34 is formed in a box shape and an opening 34C for passing a cable 44 and the like to be described later is formed in the front surface portion 34B, for example, the turning inverter 24 and the assisting power supply from the power storage device 37 are formed. The cable 44 extending to the inverter 26 can be disposed in a compact manner.

  Reference numerals 35 and 35 denote front and rear lower power storage device mounting members provided on the front end side and the rear end side of the mounting surface portion 34A of the power storage device base 34, respectively. Each of the lower power storage device mounting members 35 includes a pair of screw seats 35A that are spaced apart in the left and right directions of the mounting surface portion 34A, and a vibration isolation member 35B that is mounted on each screw seat 35A with a bolt 36. It is comprised by. The anti-vibration member 35B is formed by, for example, fixing the screw portion 35B1 to the upper surface side of an elastic member such as rubber.

  Next, the configuration of power storage device 37 according to the present embodiment will be described.

  Reference numeral 37 denotes a power storage device disposed in the power storage device accommodation space 32. The power storage device 37 is attached to the mounting surface portion 34 </ b> A of the power storage device pedestal 34. The power storage device 37 supplies power to the turning generator / motor 15 and the assist generator / motor 14 and receives power (storage) from the turning generator / motor 15 and the assist generator / motor 14. For example, a lithium ion battery is used. In addition to the lithium ion battery, for example, an electric double layer capacitor can be used as the power storage device 37. When a capacitor is used for the power storage device 37, it is preferable that a chopper is connected to the output terminal of the power storage device 37 and the output terminal voltage of the power storage device 37 is held constant by the chopper.

  The power storage device 37 includes a casing 38 formed in a vertically long box shape that is flat in the left and right directions and extends in the upper and lower directions, a battery module 41 provided in the casing 38, a battery control unit 42, a discharge And a fan 43.

  The casing 38 includes a right plate 38A facing the left surface portion 33C2 of the partition cover 33C constituting the exterior cover 33, a left plate 38B facing the right plate 38A, an upper end side of the right plate 38A, and an upper end side of the left plate 38B. An upper plate 38C, a lower plate 38D facing the upper plate 38C and connecting a lower end side of the right plate 38A and a lower end side of the left plate 38B, a right plate 38A, a left plate 38B, and an upper plate 38C. A front plate 38E that closes the front end side of the lower plate 38D, and a rear plate 38F that faces the front plate 38E and closes the rear end sides of the right plate 38A, the left plate 38B, the upper plate 38C, and the lower plate 38D. It is formed in a box shape. Here, the casing 38 is formed by integrally forming, for example, a right plate 38A, a lower plate 38D, a front plate 38E, and a rear plate 38F by means of press forming, welding, or the like, and a lid made up of a left plate 38B and an upper plate 38C. By attaching the plate to the front plate 38E and the rear plate 38F using a plurality of bolts and nuts 39, a rectangular parallelepiped container is formed.

  A lower mounting plate 38G is provided below the lower plate 38D of the casing 38. The lower mounting plate 38G covers the lower plate 38D, and the length dimension in the front and rear directions of the lower mounting plate 38G is larger than the length dimension of the lower plate 38D. It is formed slightly smaller than the length dimension of the surface portion 34A. Two through holes 38G1 penetrating in the upward and downward directions are provided on the front end side and the rear end side of the lower mounting plate 38G so as to be spaced apart in the left and right directions. Specifically, the through hole 38G1 is provided at a position corresponding to the male screw portion 35B1 of the vibration isolating member 35B constituting the front and rear lower power storage device mounting members 35 provided in the power storage device base 34. It has been. Further, a rear bracket 38H is attached to the rear plate 38F so as to be positioned at an intermediate portion in the upper and lower directions. The upper power storage device attachment member 10 is attached to the rear bracket 38H. In addition, two intake ports 38J for sucking the cooling air F toward the inside of the casing 38 are provided at positions sandwiching the rear bracket 38H in the upward and downward directions, spaced apart in the upward and downward directions (FIG. 9, FIG. 9). FIG. 11).

  The casing 38 is mounted on the upper power storage device mounting member 10 by placing the rear bracket 38H on the upper surface plate portion 10C1 of the L-shaped plate 10C constituting the upper power storage device mounting member 10 and screwing bolts and nuts 40 thereto. It is done. Since the vibration isolating member 10B is provided between the L-shaped plate 10C and the U-shaped plate 10A of the upper power storage device mounting member 10, the casing 38 is attached to the heat exchanger cover 9 in a vibration-proof state. It has a configuration.

  On the other hand, on the front plate 38E of the casing 38, two exhaust ports 38K for discharging the cooling air F sucked into the casing 38 are provided spaced apart upward and downward (see FIGS. 9 and 10). . A connection port 38L to which a cable 44 described later is connected is provided above each of the upper and lower exhaust ports 38K.

  As shown in FIG. 9, a plurality of battery modules 41, a battery control unit 42 including a relay mechanism, a current sensor, a voltage sensor, and the like are disposed inside the casing 38, and the cooling air is discharged outside the casing 38. A discharge fan 43 and the like are provided.

  The discharge fans 43 are provided at positions corresponding to the upper and lower exhaust ports 38K provided on the front plate 38E of the casing 38, respectively. Thereby, the cooling air F is sucked from the air inlet 38J provided in the rear plate 38F, cools the devices such as the battery module 41 and the battery control unit 42 in the casing 38, and flows toward the front plate 38E. It is discharged (discharged) from the exhaust port 38K provided in the front plate 38E toward the outside.

  In this case, since the cooling air F is discharged from the front surface side of the casing 38, it is possible to suppress the dust and the like floating on the front side of the excavator 1 from entering the power storage device 37. In particular, since the discharge fan 43 is provided on the exhaust port 38K side, the cooling air F can be strongly discharged from the exhaust port 38K. Thereby, the dust etc. which are going to enter from the exhaust port 38K can be pushed back toward the outside.

  Further, as shown in FIGS. 2 and 12, the power storage device 37 is electrically connected to a later-described disconnect switch 46 and inverters 24 and 26 via a cable 44. In this case, the cable 44 is connected to a connection port 38 </ b> L provided on the front plate 38 </ b> E of the casing 38, and an intermediate portion of the cable 44 is connected to the power storage device through an opening 34 </ b> C provided on the front surface portion 34 </ b> B of the power storage device base 34. Arranged in the pedestal 34. Thus, the cable 44 is compactly disposed on the front side of the power storage device 37 (the front side of the hydraulic excavator 1). Further, since the cable 44 is disposed in the power storage device pedestal 34, for example, when the cab box 28 is tilted up, the cable 44 and the cab box 28 interfere (contact) and the cable 44 is damaged. Can be suppressed.

  Here, an example of a work procedure when the power storage device 37 is attached will be described.

  First, the cab box 28 (cab unit) is tilted up with the tilt support member positioned on the front side of the revolving frame 6 as a fulcrum. Then, the male screw part 35B1 of the vibration isolating member 35B is inserted into the through hole 38G1 provided in the lower mounting plate 38G of the casing 38 of the power storage device 37, and the nut 45 is screwed into the male screw part 35B1, thereby storing the power. The device 37 is attached to the attachment surface portion 34 </ b> A of the power storage device base 34. The rear bracket 38H provided on the rear plate 38F of the casing 38 is placed on the upper surface plate portion 10C1 of the L-shaped plate 10C constituting the upper power storage device mounting member 10, and is attached to the upper power storage device by the bolts and nuts 40. It is attached to the member 10. Accordingly, the power storage device 37 can be mounted on the power storage device base 34 in the power storage device accommodation space 32. On the other hand, the power storage device 37 can be removed by performing a procedure reverse to the procedure described above.

  Since the power storage device 37 is attached to the mounting surface portion 34A of the power storage device pedestal 34 via the vibration isolation member 35B, the power storage device 37 is attached to the power storage device pedestal 34 in a vibration-proof state, and the upper power storage device mounting member 10 Since the vibration-proof member 10B is provided between the L-shaped plate 10C and the U-shaped plate 10A, the casing 38 is attached to the heat exchanger cover 9 in a vibration-proof state.

  Reference numeral 46 denotes a disconnect switch provided on the upper front side of the power storage device 37. The disconnect switch 46 is integrally attached to the front corners of the left plate 38B and the upper plate 38C of the casing 38 of the power storage device 37 by bolts and nuts 39. The disconnect switch 46 is provided, for example, connected to the positive output terminal of the power storage device 37 and has an operation button 46A. Disconnect switch 46 cuts off between power storage device 37 and inverters 24 and 26 when button 46A is operated. That is, the disconnect switch 46 energizes or shuts off the power storage device 37 and the turning generator / motor 15 and the assist generator / motor 14.

  As a result, power supply from the power storage device 37 can be stopped when an abnormality occurs in the power storage device 37 or the electrical system of the turning power generation / motor 15 and the assist power generation / motor 14. In addition, power supply can be stopped during maintenance work. Thereby, the reliability and safety of the hybrid function can be improved. Further, since the disconnect switch 46 is provided in the power storage device 37, the high-voltage current cable 44 (electric wire) connecting the disconnect switch 46 and the power storage device 37 can be shortened, and the cable 44 is deteriorated due to heat generation. , And durability and reliability can be improved. Furthermore, since the disconnect switch 46 can be attached (subassembled) to the power storage device 37 in advance, the assembly workability can be improved.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration. Next, the operation of the hydraulic excavator 1 will be described.

  First, the operator gets on the floor member 16 and sits on the driver's seat 17. By operating the operating lever / pedal 19 for traveling in this state, pressure oil is supplied from the control valve 30 to the traveling motors 2E and 2F of the lower traveling body 2, and the left and right drive wheels 2B are driven. The excavator 1 can be moved forward or backward.

  On the other hand, an operator seated in the driver's seat 17 operates the operation lever 18 for work to turn the upper swing body 4 by the swing device 3 (the power generator / motor 15 for swing) or to lift the work device 5 up and down. Or excavation work of earth and sand.

  In this case, the assist generator / motor 14 is driven to rotate by the engine 11 to generate electric energy. The turning generator / motor 15 generates electric energy (regenerative energy) when the turning operation is decelerated. This electrical energy is stored in the power storage device 37 via the cables 25 and 44. The electrical energy stored in the power storage device 37 is supplied to the turning generator / motor 15 and the assisting generator / motor 14 and used as auxiliary power when driving the turning device 3 and the engine 11.

  Thus, according to the present embodiment, the power storage device accommodation space 32 is formed between the floor member 16 and the fuel tank 31, and the power storage device 37 is arranged in the power storage device accommodation space 32. Therefore, the power storage device 37 required when the hydraulic excavator 1 is hybridized can be easily mounted on the upper swing body 4 using the power storage device accommodation space 32.

  As a result, the existing hydraulic excavator 1 can be utilized and the hydraulic excavator 1 can be hybridized without changing the arrangement of equipment such as the engine 11 and the fuel tank 31 disposed on the upper swing body 4. In addition, since the power storage device accommodation space 32 is a space opened upward or forward, the power storage device 37 can be easily detached, so that the workability of the assembly and maintenance work of the power storage device 37 is improved. Can do.

  A partition cover 33 </ b> C is provided between the power storage device 37 and the fuel tank 31. Thereby, since the partition cover 33C can shield the heat of the fuel tank 31 from the power storage device 37, the performance and life of the power storage device 37 can be improved.

  Further, since the cooling air F introduced into the power storage device 37 is discharged from the exhaust port 38K provided on the front side of the power storage device 37, the upper swing body in which a lot of dust is dancing due to the work of the work device 5 or the like. 4 can be prevented from entering the power storage device 37 from the front side. Thereby, the performance and life of the power storage device 37 can be improved.

  In addition, since the power storage device 37 is provided with a disconnect switch 46, when an abnormality occurs in the power storage device 37 or the electric system of the turning power generation / motor 15 and the assist power generation / motor 14, the power storage device 37 Can be stopped. In addition, power supply can be stopped during maintenance work. Thereby, the reliability and safety of the hybrid function can be improved. Further, since the disconnect switch 46 is provided in the power storage device 37, the high-voltage current cable 44 (electric wire) connecting the disconnect switch 46 and the power storage device 37 can be shortened, and the cable 44 is deteriorated due to heat generation. , And durability and reliability can be improved. Furthermore, since the disconnect switch 46 can be attached (subassembled) to the power storage device 37 in advance, the assembly workability can be improved.

  In addition, the power storage device 37 is attached to the mounting surface portion 34 </ b> A of the power storage device pedestal 34 provided in the turning frame 6. Thus, the power storage device 37 can be mounted on the dedicated pedestal 34, so that the power storage device 37 can be easily attached and detached. Therefore, the workability of assembly work and maintenance work of the power storage device 37 can be improved.

  In the above-described embodiment, the case where the discharge fan 43 is provided in the exhaust port 38K provided in the front plate 38E of the power storage device 37 has been described as an example. However, the present invention is not limited to this, and for example, a suction fan may be provided at an intake port provided on the rear plate of the power storage device.

  In the above-described embodiment, the hybrid ultra-swivel type hydraulic excavator 1 has been described as an example of the hybrid construction machine. However, the present invention is not limited to this, and may be applied to, for example, an ultra-small turning type hydraulic excavator, a general hybrid type excavator in which the turning radius of the upper turning body protrudes from the vehicle width dimension of the lower traveling body, and the like. be able to. Further, the present invention can also be applied to a construction machine provided with a wheel type lower traveling body.

1 Hybrid hydraulic excavator (hybrid construction machine)
DESCRIPTION OF SYMBOLS 2 Lower traveling body 3 Turning apparatus 4 Upper turning body 5 Work apparatus 5A Boom 5B Arm 5C Bucket 5D Boom cylinder (hydraulic actuator)
5E Arm cylinder (hydraulic actuator)
5F Bucket cylinder (hydraulic actuator)
6 Rotating frame 7 Counterweight 11 Engine 13 Hydraulic pump 14 Assist generator / motor 15 Rotating generator / motor 16 Floor member 17 Driver's seat 29 Hydraulic oil tank (oil storage tank)
31 Fuel tank
32 Power Storage Device Storage Space 33 Exterior Cover 33C Partition Cover 34 Power Storage Device Base 34A Mounting Surface (Upper Surface)
37 Power storage device 38 Casing 38E Front plate 38F Rear plate 38J Inlet port 38K Exhaust port 41 Battery module 46 Disconnect switch

Claims (5)

A self-propelled lower traveling body, an upper revolving body mounted on the lower traveling body via a revolving device using a power generator / motor for turning as a power source, and a hydraulic actuator on the front side of the upper revolving body And a working device provided to be able to move up and down using a power source,
The upper swing body is
A swivel frame forming a support structure;
A counterweight attached to the rear end of the swivel frame to balance the weight with the working device;
An engine mounted on the front side of the counterweight and mounted horizontally in a left and right direction on the rear side of the revolving frame;
A hydraulic pump driven by the engine to supply pressure oil to the hydraulic actuator;
An assisting generator / motor coupled to the engine and the hydraulic pump;
A floor member provided on one side of the left and right directions of the revolving frame on the front side of the engine and having a driver's seat on which an operator is seated;
An oil storage tank that is provided on the other side in the left and right directions of the swivel frame and stores fuel or hydraulic oil therein;
A hybrid comprising a power storage device that supplies electric power to the turning generator / motor and the assist generator / motor and receives electric power from the turning generator / motor and the assist generator / motor. In the construction machine
Between the floor member and the oil storage tank is provided a power storage device accommodation space extending in the front, rear direction and up and down direction,
The hybrid construction machine is characterized in that the power storage device is arranged in the power storage device accommodation space. The power storage device accommodation space is provided with a partition cover extending forward and rearward along the oil storage tank,
The hybrid construction machine according to claim 1, wherein the power storage device is configured to be disposed in the power storage device accommodation space formed between the floor member and the partition cover. The power storage device is formed in a box shape extending in the front, rear direction and upward, downward direction in the power storage device accommodation space,
The rear plate of the power storage device is provided with an intake port for sucking cooling air into the power storage device,
3. The hybrid construction machine according to claim 1, wherein an exhaust port for discharging the cooling air sucked into the power storage device is provided on a front plate of the power storage device.   4. The power storage device according to claim 1, 2 or 3, wherein the power storage device is provided with a disconnect switch for energizing or shutting off between the power storage device and the turning generator / motor and the assist generator / motor. The described hybrid construction machine. The swivel frame is attached with a power storage device pedestal that is positioned in the power storage device accommodation space and extends in the front and rear directions,
The hybrid construction machine according to claim 1, 2, 3, or 4, wherein the power storage device is configured to be attached to an upper surface of the power storage device base.

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