JP6106832B2 - Hybrid compact hydraulic excavator - Google Patents

Description

The present invention relates to a hybrid compact hydraulic excavator that has two types of power sources, for example, an engine and a generator / motor, and uses these two types of power sources as appropriate 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.

  This hybrid hydraulic excavator includes a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body via a swivel device, and a hydraulic actuator on the front side of the upper revolving body as a power source. And a working device provided so as to be able to move up and down.

  On the other hand, the upper revolving structure is attached to the revolving frame that forms the support structure, the revolving generator / motor that is attached to the revolving frame and serves as a power source for rotationally driving the revolving device, and the rear end of the revolving frame. A counterweight that balances the weight with the working device, an engine that is positioned in front of the counterweight and that is mounted in a lateral state extending leftward and rightward on the rear side of the turning frame, and the engine A hydraulic pump that is driven to supply pressure oil to the hydraulic actuator, an assist generator / motor connected to the engine and the hydraulic pump, and a front portion on one side of the left and right directions of the swing frame. A driver's seat mounting portion which is formed by a footrest portion on which an operator puts his / her foot and a driver seat mounting portion which rises upward from the rear portion of the footrest portion and extends rearward toward the upper side of the engine. An oil storage tank that stores fuel or hydraulic oil therein, and is provided with a gap between the member and the floor member on the left and right sides of the swivel frame, and the swivel generator / motor And a power storage device that feeds electric power to the assist generator / motor and receives power from the assist generator / motor and the assist generator / motor (see, for example, Patent Document 1) ).

JP 2011-241540 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, existing hydraulic excavators can be used, and various electric parts for hybridization, such as power generation / motors, power storage devices, etc., can be mounted on the hydraulic excavators. Changing the design in this way is a shortcut to hybridization.

  Further, the turning generator / motor is arranged near the center of the turning frame. On the other hand, the floor member covers many areas on the revolving frame because the upper revolving structure is downsized. For this reason, the turning generator / motor is arranged below the footrest portion of the floor member. In this case, since the electric generator / motor for turning is configured such that the electric motor is mounted on the upper side of the speed reducer, the height is larger than that of the hydraulic motor for turning, and the electric motor is mounted on the footrest of the floor member. May interfere with pedal operation and the like.

  Therefore, in Patent Document 1, the electric motor is moved in parallel with respect to the speed reducer, and the speed reducer and the electric motor are connected with a mechanism for transmitting a rotational force. Accordingly, the electric motor can be moved to the position of the driver seat mounting portion formed higher than the footrest portion, for example, avoiding the lower side of the footrest portion.

  However, since the turning generator / motor according to Patent Document 1 is provided with a mechanism for transmitting the rotational force between the speed reducer and the electric motor, the assembly workability is increased due to the increase in the number of parts, the complexity of the parts, and the like. It gets worse. Moreover, since a large installation space is required due to an increase in the size of the generator / motor for turning, there is a problem that it becomes an obstacle to downsizing the upper turning body.

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 arrange the turning power generator / motor at a position that does not interfere with pedal operation or the like without increasing the size of the turning power generator / motor. An object of the present invention is to provide a hybrid compact hydraulic excavator that can be used.

A hybrid small hydraulic excavator according to the present invention includes a self-propelled crawler-type lower traveling body and a swivel device mounted on the lower traveling body via a swivel device so that the rear portion is the crawler-type lower traveling body during a turning operation. And a working device provided on the front side of the upper swing body so as to be able to move up and down using a hydraulic actuator as a power source. The upper swing body extends in the front and rear directions. A swivel frame comprising a bottom plate, a left vertical plate and a right vertical plate standing on the bottom plate and extending in the left and right directions with an interval in the left and right directions, and forming a support structure; A power generator / motor for turning that is a power source for rotationally driving the turning device, a counterweight that is attached to a rear end of the turning frame and balances the weight of the working device, and a front side of the counterweight An engine mounted in a horizontally placed position on the rear side of the revolving frame and extending in the left and right directions, a hydraulic pump driven by the engine and supplying pressure oil to the hydraulic actuator, the engine and the engine The assist generator / motor connected to the hydraulic pump and the left and right front portions of the swivel frame are supported by a tilt support member so as to be able to be tilted up and tilted down. A floor member comprising a footrest portion on which a foot is placed and a driver seat mounting portion that rises upward from the rear portion of the footrest portion and extends rearwardly toward the upper side of the engine; An oil storage tank for storing fuel or hydraulic oil therein, the turning generator / motor, and the assist generator / electric generator. It performs feeding of power to the machine, comprising a power storage device that performs the receiving of power from the swing motor-generator and motor-generator for the assist.

In order to solve the above-mentioned problem, the feature of the configuration adopted by the invention of claim 1 is that the footrest portion of the floor member is located at a position outside the operation range where various pedal operations are performed and the floor member. A notch hole is provided adjacent to the gap at a position opposite to the entrance when getting on and off , and the notch hole is pivoted when the floor member is tilted down or tilted up. It is formed as an opening that can avoid contact with the generator / motor, and the bottom plate of the swivel frame is located below the notch hole and between the left vertical plate and the right vertical plate. and motor mounting hole is provided for attaching the swing motor-generator, the prior Ki旋 times for motor-generator, with mounted on the bottom plate in a state of being fitted into the motor mounting hole, the Through notch hole Extends above the footrest section of the floor member Te, the footrest section of the floor member, the motor cover is provided for covering the upper portion of the swing motor-generator which projects upwardly from the notched hole It lies in the fact that Zheng Ru configuration.

According to the invention of claim 2, the electric motor cover includes a flat high plate portion located on the front side, a falling portion that falls downward from the rear end of the high plate portion, and a rear side from the lower end of the falling portion. The floor member is formed by a top plate formed by a flat low plate portion extending to the front, a front portion, a rear surface portion, and a left surface portion extending downward from three sides of the front, rear, and left sides of the top plate. that is constituted by the attached peripheral surface plate in the footrest section to the welding unit.

According to the invention of claim 3, wherein the floor member in order to partition between the gap, before along the side edges of the driver's seat mounting portion and the footrest section, it is erected so as to extend in the rear direction wallboard has, in the wall plate, Ru Tei and from said lower end to a position leading to the notch hole notching upward providing an upward notched hole configuration.

According to the invention of claim 4, the output of the engine, the catering and the force required to drive the hydraulic pump with a light load, the load of the hydraulic pump is larger than the load, for pre-Symbol Assisted output of the generator-motor, Ru Tei a configuration you assisting output of the engine.

According to the first aspect of the present invention, the footrest portion of the floor member is located at a position outside the operation range where various pedal operations are performed and on the opposite side to the entrance when getting on and off the floor member. , A notch hole is provided at a position adjacent to the gap on the other side of the right direction, and the notch hole is in contact with the turning generator / motor of the turning device when the floor member is tilted down or tilted up. It is formed as an opening that can be avoided . The bottom plate of the swivel frame is provided with a motor mounting hole for mounting the power generator / motor for swivel located below the notch hole and between the left vertical plate and the right vertical plate. The turning generator / motor is attached to the bottom plate in a state of being inserted into the motor attachment hole, and extends above the footrest portion of the floor member through the notch hole .

  Therefore, the turning generator / motor is arranged in a state of extending upward through the notch hole, but the position of the notch hole is out of the operation range for performing various pedal operations. The turning generator / motor can be disposed at a position that does not interfere with pedal operation. Moreover, since the position adjacent to the gap with the oil storage tank is on the opposite side of the entrance when getting on and off the floor member, the turning generator / motor can be in the way when getting on and off the floor member. Absent.

As a result, the swivel generator / motor can be installed with a simple structure in which the swivel generator / motor is arranged on the swivel frame in accordance with the notch hole formed at a position outside the operation range on the footrest where the pedal is operated. It can be placed at a position where it does not interfere with pedal operation. Thereby, the enlargement of the generator / motor for turning can be suppressed, and the upper turning body can be reduced in size. Moreover, the motor cover provided on the footrest portion of the floor member can cover the upper part of the turning generator / motor projecting upward from the notch hole. Thereby, in the living space of the operator on the floor member, it is possible to prevent intrusion of operation sound, oil liquid, etc., and to improve the appearance by covering the turning generator / motor.

According to the invention of claim 2, the electric motor cover provided on the footrest portion of the floor member includes a flat high plate portion located on the front side, a falling portion falling downward from the rear end of the high plate portion, and A top plate formed by a flat low plate portion extending rearward from the lower end of the falling portion, and a front portion, a rear surface portion extending downward from three sides on the front side, the rear side, and the left side of the top plate, It can be constituted by a peripheral surface plate formed by the left surface portion and attached to the footrest portion of the floor member by welding means .

  According to the invention of claim 3, the floor member is erected on the floor member so as to extend forward and rearward along the side edges of the footrest portion and the driver seat mounting portion. In this case, since the wall plate is provided with an upward notch hole so as to connect to the notch hole so as to be connected to the notch hole, the turning generator / motor is disposed even at a position protruding from the footrest part. Can increase the degree of freedom of design.

According to the description of claim 4, since the engine output is set to cover the force required to drive the hydraulic pump with a light load, the engine has a small output (small displacement). Things can be used. As a result, against the exhaust gas regulations for purifying the exhaust gas, it is possible to reduce the burden of the regulations by suppressing the output of the engine to a non-regulated object, and it is possible to hybridize a small hydraulic excavator at a low cost. .

  In addition, since the engine with a small output is formed in a small size as a whole, it is possible to secure a space for arranging the devices around the engine, and in addition to the downsizing of the engine, the upper swing body Can be reduced in size. On the other hand, the fuel consumption rate can be improved by using a small (small displacement) engine. Further, when the hydraulic pump is driven with a heavy load larger than a light load, the hydraulic pump can be driven by assisting the output of the engine with the output of the assisting generator / motor.

1 is a front view showing a hybrid compact hydraulic excavator according to an embodiment of the present invention. It is a left view which shows the hybrid type small hydraulic excavator which abbreviate | omitted the working apparatus from the front side. It is a perspective view which expands and shows the upper turning body which abbreviate | omitted the cab box. It is a top view which expands and shows the upper turning body which abbreviate | omitted the cab box, the driver's seat, the exterior cover, etc. It is a perspective view which shows the upper turning body of FIG. 3 in the state which abbreviate | omitted the floor member. It is a disassembled perspective view which shows the upper revolving body of FIG. 5 in the state which removed the heat exchanger cover, the electrical component unit, and the exterior cover. FIG. 4 is an enlarged front view showing the upper swing body in FIG. 3 with a floor member in a cross-sectional state. It is an enlarged back view which shows the state which mounted the floor member, the generator / motor for turning, etc. on the turning frame from the right side. FIG. 9 is an enlarged rear view of the state in which the floor member is tilted up as viewed from the same position as in FIG. 8. It is a top view which shows a turning frame and the generator / motor for turning. It is sectional drawing which looked at the turning frame and the generator / motor for turning from the direction of arrows XI-XI in FIG. It is a perspective view which expands and shows the state which attached the electric motor cover to the floor member. It is the disassembled perspective view which looked at the floor member of the state which removed the electric motor cover from the same position as FIG. It is a perspective view of the principal part expansion which shows the attachment state of the electric motor cover with respect to a floor member. It is an expansion perspective view which shows a single motor cover. It is a characteristic diagram which shows the relationship between the output characteristic of an engine, the output characteristic of a generator / motor, and the characteristic of a hydraulic pump. It is a characteristic line figure which shows the output characteristic of an engine and a generator / motor. It is a block diagram which shows the operation system of a hybrid type small hydraulic excavator.

Hereinafter, a hybrid type small hydraulic excavator according to an embodiment of the present invention, an example of the hybrid type small hydraulic excavator using a combination of the engine and the generator-motor as a power source, in detail with reference to FIGS. 1 to 18 explain.

In Figure 1, 1 denotes a hybrid type small hydraulic excavator. The hybrid small hydraulic excavator 1 (hereinafter referred to as a hybrid hydraulic excavator 1) is called a mini excavator having an operating mass of less than 6 tons, for example. The hydraulic excavator is a rear ultra-small swivel excavator that is substantially within the width dimension.

  As shown in FIGS. 1 and 2, the hybrid 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 revolving unit 4 is mounted on the upper revolving unit 4 so as to be able to revolve through the revolving unit 3, and the working unit 5 is provided on the front side of the upper revolving unit 4 so as to be able to move up and down, and performs soil excavation work and the like. ing.

  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, and a crawler belt 2D wound around the drive wheel 2B and the idler wheel 2C (both shown only on the left side) are configured. The left and right drive wheels 2B are rotationally driven by left and right traveling motors 2E and 2F (see FIG. 18), 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. Here, for example, the traveling motors 2E and 2F of the lower traveling body 2 can switch the traveling speed between two stages of a low speed stage and a high speed stage.

  The turning device 3 supports the upper turning body 4 so as to be turnable in the horizontal direction with respect to the lower traveling body 2. The turning device 3 includes an annular inner ring attached on the cylindrical body 2G of the lower traveling body 2, an annular outer ring provided concentrically on the outer side in the radial direction of the inner ring, an outer peripheral side of the inner ring, A large number of rolling elements (all not shown) that are rotatably arranged between the inner ring and the outer ring and that support the inner ring and the outer ring so that they can rotate relative to each other; The generator / motor 8 is included.

  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 has a later-described swing frame 6 mounted on the lower traveling body 2 via the swing device 3 so as to be freely swingable. As shown in FIGS. Power generator / motor 8 for turning, counterweight 9, engine 11, hydraulic pump 13, power generator / motor 14 for assist, floor member 15, hydraulic oil tank 27, fuel tank 28, power storage device 30, notch holes 38, 39, motor A cover 40 and the like are provided.

  A revolving frame 6 forms a support structure for the upper revolving structure 4. As shown in FIGS. 10 and 11, the revolving frame 6 is erected on the bottom plate 6A extending in the front and rear directions, and on the bottom plate 6A extending in the front and rear directions with an interval in the left and right directions. A left vertical plate 6B, a right vertical plate 6C, a left side frame 6D that extends from the front end portion of the bottom plate 6A to the left and to the left in the right direction and is bent and extended rearward, and a left and right from the front end portion of the bottom plate 6A. A right side frame 6E that is bent while extending to the right in the direction and extends rearward, and extends to the left and right on the bottom plate 6A while being fixed to the rear ends of the vertical plates 6B and 6C. The rear horizontal plate 6F, the C-shaped or U-shaped rear vertical plate 6G standing on the bottom plate 6A and positioned on the rear side of the rear horizontal plate 6F, and the vertical plates 6B and 6C. And a support bracket 6H provided on the front side. The support bracket 6H 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.

  Further, the bottom plate 6A constituting the revolving frame 6 is provided with a motor mounting hole 6J at a position corresponding to a notch hole 38 of the floor member 15 described later. The motor mounting hole 6J is formed as a circular hole for mounting a later-described turning generator / motor 8.

  Here, the position where the motor mounting hole 6J is provided will be described. The motor mounting hole 6J is provided in the vicinity of the inner ring because the turning generator / motor 8 meshes with an internal gear formed on the inner peripheral side of the inner ring of the turning device 3. Specifically, the cutout hole 38 of the floor member 15 is located at a position that does not interfere with the pedal operation of the operator on the floor member 15 and the operation of getting on and off the floor member 15, that is, in the left and right directions of the floor member 15. It is formed at the right position. Therefore, the motor mounting hole 6J is positioned on the front side (rear side of the support bracket 6H) of the bottom plate 6A so as to be positioned below the notch hole 38 of the floor member 15, and the left and right vertical plates 6B and 6C. It is provided in between.

  Reference numeral 7 denotes a power storage device mounting base provided on the revolving frame 6. The power storage device mounting base 7 mounts a power storage device 30 described later on the revolving frame 6. The power storage device mount 7 is disposed in the vicinity of the center of the revolving frame 6, specifically, in a gap 29 formed between a floor member 15 and a fuel tank 28 described later, and the upper position of the right vertical plate 6 </ b> C is set to the right. It is formed as a horizontally long box-shaped base extending from the front end of the side frame 6E to the rear horizontal plate 6F.

  Reference numeral 8 denotes a turning generator / motor which is a characteristic part of the present invention and is attached to the turning frame 6. As shown in FIG. 11, the turning generator / motor 8 serves as a power source for rotationally driving the upper turning body 4 on the turning device 3, that is, the lower traveling body 2. The turning generator / motor 8 is bolted to the bottom plate 6A with the lower side inserted into the motor mounting hole 6J of the turning frame 6, and a reduction mechanism 8A having gear reduction means (not shown) inside, An electric motor 8B attached to the upper part of the speed reduction mechanism 8A so as to extend upward, and a pinion 8C provided on the output shaft (not shown) of the speed reduction mechanism 8A located below the speed reduction mechanism 8A. It is comprised by. The turning generator / motor 8 is provided with, for example, a connection terminal 8D located on the rear side, and a three-phase AC cable 34 described later is connected to the connection terminal 8D.

  The turning generator / motor 8 is disposed at a position corresponding to a cutout hole 38 of the floor member 15 described later by being attached to the bottom plate 6A while being inserted into the motor attachment hole 6J of the turning frame 6. . Moreover, since the turning generator / motor 8 has a larger height (upper and lower dimensions) from the bottom plate 6A than the hydraulic type, the floor member 15 is provided as shown in FIGS. In the tilted-down state, the upper electric motor 8 </ b> B passes through the cutout hole 38 and extends upward from the footrest portion 16 of the floor member 15.

  However, since the turning generator / motor 8 is disposed at a position corresponding to the cutout hole 38 of the floor member 15, when operating the operation lever / pedal 22, which will be described later, or when getting on and off the floor member 15. It won't get in the way.

  The turning generator / motor 8 is configured to turn the upper turning body 4 on the lower traveling body 2 via the turning device 3 by rotationally driving the pinion 8C by power supply from a power storage device 30 described later. On the other hand, the turning generator / motor 8 can store the regenerative energy generated when the turning operation is decelerated in the power storage device 30. The turning generator / motor 8 is electrically connected to the turning inverter 33 via a three-phase AC cable 34.

  Reference numeral 9 denotes a counterweight attached to the rear end portion of the revolving frame 6. The counterweight 9 is for balancing the weight with the working device 5 and has a convex curved shape protruding rearward. A floor mounting bracket 9A is provided on the upper front side of the counterweight 9, and a rear side of a floor member 15 described later is mounted on the upper side of the floor mounting bracket 9A. Further, an upper portion of an electrical component mounting bracket 32 described later is mounted on the front side of the floor mounting bracket 9A.

  A heat exchanger cover 10 is provided on the right side of the floor mounting bracket 9A and extends from the counterweight 9 to the front side. The heat exchanger cover 10 includes an upper surface portion 10A that covers an upper side of the engine 11 and the heat exchanger 12 described later, and extends downward from the front side of the upper surface portion 10A to cover the front side of the engine 11 and the heat exchanger 12. For example, the lower side of the front surface portion 10B is attached to the rear portion of the power storage device mounting base 7.

  Reference numeral 11 denotes an engine provided on the swivel frame 6 located on the front side of the counterweight 9. The engine 11 is mounted on a rear vertical plate 6G located on the rear side of the revolving frame 6 in a horizontally placed state extending in the left and right directions. As shown in FIG. 6, the engine 11 is provided with an exhaust pipe 11 </ b> A for exhausting exhaust gas. The exhaust pipe 11 </ b> A is provided with a muffler 11 </ b> B located on the left side of the engine 11. 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. As shown in FIG. 17, the output of the engine 11 is set to a magnitude that can cover the force required to drive a hydraulic pump 13 described later with a light load. Specifically, the output of the engine 11 is normal when the lower traveling body 2 is traveling at a low speed or when a general excavation operation is performed using the working device 5 and the turning device 3. The value required for driving the hydraulic pump 13 during the operation is set. On the other hand, when the load on the hydraulic pump 13 becomes larger than the light load, for example, when the lower traveling body 2 is traveling at a high speed, the assist generator / motor 14 is output with respect to the output of the engine 11. The hydraulic pump 13 is driven by assisting the output.

  Accordingly, the engine 11 only needs to have an output capable of driving the hydraulic pump 13 with a light load. Therefore, the engine 11 can be reduced in size (smaller displacement) according to the output, and equipment related to the engine 11 such as a muffler can be used. 11B (exhaust gas aftertreatment device), heat exchanger 12 and the like can also be reduced in size. Thereby, the space for installing devices can be provided around the engine 11 by downsizing each device.

  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. The hydraulic pump 13 boosts 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.

  Here, as shown in FIG. 16, the output required to drive the hydraulic pump 13 with a light load can be covered by the output of the engine 11. On the other hand, the output required to drive the hydraulic pump 13 with a load heavier than this can be provided by adding (assisting) the output of the assist generator / motor 14 described later to the output of the engine 11. .

  Reference numeral 14 denotes an assist generator / motor (see FIG. 6) that is located on the left side of the engine 11 and is connected to the output shaft of the engine 11 and the input shaft of the hydraulic pump 13. The assist generator / motor 14 generates power by being rotationally driven by the engine 11 or assists the drive of the hydraulic pump 13 in addition to the engine 11. The assist generator / motor 14 is electrically connected to an assist inverter 35 via a three-phase AC cable 34 described later.

  Next, the structure of the floor member 15 in which the notch hole 38 which is a characteristic part of the present invention is formed will be described.

  Reference numeral 15 denotes a floor member provided on the left side which is one side of the left and right directions on the revolving frame 6. As shown in FIGS. 7 to 9, the floor member 15 is supported so that its front end position can be tilted (tilted up and tilted down) to the front end position of the revolving frame 6 via a tilt support member 26 described later. Has been. On the other hand, the rear position of the floor member 15 is supported by the upper portion of the counterweight 9. The floor member 15 includes a footrest portion 16, a driver seat mounting portion 17, a lever / pedal mounting portion 18, and a wall plate 19 which will be described later.

  Reference numeral 16 denotes a footrest portion located in a low place on the front side of the floor member 15. This footrest portion 16 is for an operator sitting on a driver's seat 20 described later to place his / her foot. The footrest portion 16 includes a work floor portion 16A formed as a substantially rectangular flat plate elongated in the left and right directions in a wide range from the front side to the right end portion of the driver's seat 20, and a cab box to be described later. The step portion 16B is formed on the left side of the work floor portion 16A on the 25 door 25A side so as to be lowered by one step and forms a floor portion for getting on and off when an operator gets on and off the floor member 15.

  Reference numeral 17 denotes a driver seat mounting portion that constitutes a rear portion of the floor member 15 for mounting a driver seat 20 described later. The driver seat mounting portion 17 is formed in a step shape that rises upward from the rear portion of the footrest portion 16 and extends rearward toward the upper side of the engine 11. As shown in FIGS. 12 and 13, the driver seat mounting portion 17 includes a rising portion 17A that rises upward from the rear portion of the footrest portion 16, and a flat plate 17B that extends rearward from the upper portion of the rising portion 17A. The back plate 17C extends obliquely upward from the rear portion of the flat plate 17B, and the mounting plate 17D extends from the upper portion of the back plate 17C to the rear side. A driver's seat 20 is mounted on the flat plate 17B.

  Reference numeral 18 denotes a lever / pedal mounting portion provided on the front side of the footrest portion 16 (see FIGS. 3 and 12). The lever / pedal mounting portion 18 extends in the left and right directions along the front end of the footrest portion 16 and can be tilted to the front portion of the revolving frame 6 via a tilt support member 26 (to be described later). It can be installed down). Further, the lever / pedal mounting portion 18 is positioned at the center in the left and right directions, and has a central opening 18A for mounting an operation lever / pedal 22 for traveling, which will be described later, and a left positioned on the left side of the central opening 18A. An opening 18B and a right opening 18C located on the right side of the central opening 18A are provided. The left and right openings 18B and 18C are provided with pedals 23 and 24, which will be described later, for swinging the work device 5 and driving optional hydraulic equipment (not shown).

  A wall plate 19 is provided on the right side of the floor member 15. The wall plate 19 is erected so as to extend forward and rearward along the side edges of the footrest portion 16 and the driver seat mounting portion 17. That is, the wall plate 19 is a vertical plate inclined downward from the upper part of the back plate 17C toward the front side, and partitions the gap 29 described later.

  Here, a range required when an operator who has boarded the floor member 15 performs an operation (work) on the footrest portion 16, that is, an operation range for performing various pedal operations will be described. Since the operator seated in the driver's seat 20 opens both feet to operate the left and right operation pedals 23 and 24, the left can be put on each operation pedal 23 and 24 as the operation range in the left and right directions. , Right dimension (width dimension) is required. Specifically, the range between the left opening 18B and the right opening 18C provided in the lever / pedal mounting portion 18 is the left and right dimension of the operation range when the pedal is operated. On the other hand, the front and rear dimensions of the operation range are the same as the front and rear dimensions of the footrest portion 16. From these things, the operation range required in order to operate a pedal on the footrest part 16 is the same range as the work floor part 16A.

  Reference numeral 20 denotes a driver seat provided on the flat plate 17B of the driver seat mounting portion 17 constituting the floor member 15, and the operator seat 20 is seated by an operator. On the left and right sides of the driver's seat 20, work operation levers 21 are provided for operating the work device 5 and the like.

  Reference numeral 22 denotes a traveling operation lever / pedal provided in the central opening 18A of the lever / pedal mounting portion 18 in front of the driver's seat 20. The operating lever / pedal 22 for traveling is operated by manual operation or stepping operation when the lower traveling body 2 is traveled.

  Reference numeral 23 denotes a spare operation pedal that is located on the left side of the operation lever / pedal 22 and is provided in the left opening 18B of the lever / pedal mounting portion 18. The spare operation pedal 23 is an additional hydraulic device, for example, This is operated when driving a breaker, grapple, etc. (both not shown). On the other hand, 24 is a swing operation pedal located on the right side of the operation lever / pedal 22 and provided in the right opening 18C of the lever / pedal mounting portion 18. The operation pedal 24 moves the work device 5 in the left and right directions. A swing operation (swing operation) is performed.

  Reference numeral 25 denotes a cab box provided on the floor member 15, and the cab box 25 is formed as a box body with a lid that is long in the upward and downward directions. A door 25 </ b> A is provided on the left side surface of the cab box 25 so as to be close to the front side so as to be opened and closed. By opening this door 25A, it is possible to get on and off the floor member 15. In addition, it can replace with the cab box 25 and can also apply the canopy provided with the roof part on the support | pillar.

  Here, the floor member 15, the driver's seat 20, the operation lever 21 for work, the operation lever / pedal 22 for traveling, the cab box 25, and the like are configured as one unit mounted on the turning frame 6. As shown in FIG. 7, this cab unit has a hinge structure in which the lever / pedal mounting portion 18 of the floor member 15 has an axis extending in the left and right directions with respect to the front end portion of the revolving frame 6. The left and right tilt support members 26 are attached. As a result, the cab unit can tilt upward and downward on the rear side with the tilt support member 26 on the front side as a fulcrum.

  27 is a hydraulic oil tank as an oil storage tank (see FIG. 4). The hydraulic oil tank 27 is located on the left side of the revolving frame 6, on the right side which is the other side in the right direction, specifically on the front side of the heat exchanger 12. Located in the vicinity of the right side frame 6E. The hydraulic oil tank 27 stores hydraulic oil supplied to the hydraulic pump 13.

  Reference numeral 28 denotes 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 27. The fuel tank 28 stores fuel to be supplied to the engine 11.

  Here, the hydraulic oil tank 27 and the fuel tank 28 constituting the oil storage tank, more specifically, the fuel tank 28 are arranged on the right side of the right vertical plate 6C of the revolving frame 6, thereby the floor member 15 (cab box). 25) with a gap 29 interposed therebetween. In a gap 29 between the fuel tank 28 and the floor member 15, a power storage device 30 described later is disposed on the power storage device mount 7.

  Reference numeral 30 denotes a power storage device provided on the revolving frame 6. The power storage device 30 is disposed on the power storage device mounting base 7 in a gap 29 between the fuel tank 28 and the floor member 15 (cab box 25). ing. The power storage device 30 supplies power to the turning generator / motor 8 and the assist generator / motor 14 and receives power from the turning generator / motor 8 and the assist generator / motor 14 (storage). 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 30. In the case where a capacitor is used for the power storage device 30, it is preferable that a chopper is connected to the output terminal of the power storage device 30 and the output terminal voltage of the power storage device 30 is kept constant by the chopper.

  The power storage device 30 is formed in a vertically long rectangular parallelepiped shape that is flat in the left and right directions and extends upward and downward so as to fit in a narrow space between the fuel tank 28 and the cab box 25. As shown in FIG. 18, the power storage device 30 is electrically connected to a later-described disconnect switch 31 and inverters 33 and 35 via a power supply cable 37.

  Reference numeral 31 denotes a disconnect switch provided on the upper front side of the power storage device 30. The disconnect switch 31 is provided, for example, connected to the positive output terminal of the power storage device 30 and includes an operation button 31A (see FIG. 3). The disconnect switch 31 normally connects between the power storage device 30 and each of the inverters 33 and 35, and shuts off between the power storage device 30 and each of the inverters 33 and 35 when the button 31A is operated. It is.

  An electrical component mounting bracket 32 is provided on the revolving frame 6 and is located on the front side of the engine 11. As shown in FIG. 7, the electrical component mounting bracket 32 is formed in a step shape along the driver seat mounting portion 17 of the floor member 15 and is disposed in the driver seat mounting portion 17. The electrical component mounting bracket 32 has an upper portion attached to the floor mounting bracket 9A of the counterweight 9 and a lower portion attached to the upper portion of the rear horizontal plate 6F of the revolving frame 6.

  Reference numeral 33 denotes a turning inverter electrically connected to the generator / motor 8 for controlling the generator / motor 8 for turning. The turning inverter 33 is attached to the right position of the electrical component mounting bracket 32 on the power storage device 30 side. Thus, the turning inverter 33 is arranged in the vicinity of the rear side of the turning generator / motor 8 and is connected to the turning generator / motor 8 using the three-phase AC cable 34. The turning inverter 33 is configured by combining a plurality of switching elements (not shown) and the like.

  The turning inverter 33 converts AC regenerative power generated by the turning power generation / motor 8 into DC power and supplies it to the power storage device 30 during regeneration of the turning power generation / motor 8. On the other hand, when the turning power generator / motor 8 is driven to turn, the DC power from the power storage device 30 is converted into AC driving power and supplied to the turning power generator / motor 8.

  Here, as shown in FIG. 11, the three-phase AC cable 34 is connected to a connection terminal 8D provided on the rear side of the turning power generator / motor 8, and is turned from the connection terminal 8D while being turned to the turning inverter 33. It extends to the rear side.

  An assist inverter 35 is electrically connected to the generator / motor 14 in order to control the assist generator / motor 14. The assist inverter 35 is attached to the electrical component mounting bracket 32 side by side on the left side of the turning inverter 33 (the side away from the power storage device 30). As a result, the assist inverter 35 is disposed at a position close to the assist generator / motor 14 disposed on the left side of the engine 11.

  The assist inverter 35 is configured by combining a plurality of switching elements (not shown) and the like, like the turning inverter 33. The assist inverter 35 converts AC generated power by the assist generator / motor 14 into DC power and supplies it to the power storage device 30 when the assist generator / motor 14 generates power. On the other hand, when the assist generator / motor 14 is driven, the assist inverter 35 converts the DC power from the power storage device 30 into AC drive power and supplies it to the assist generator / motor 14.

  The assist inverter 35 is connected to the assist generator / motor 14 using a three-phase AC cable 34 in the same manner as between the swing inverter 33 and the swing generator / motor 8 described above.

  A contactor box 36 is located on the left side of each of the inverters 33 and 35 and is attached to the electrical component mounting bracket 32. The contactor box 36 is electrically connected between the turning inverter 33 and the assisting inverter 35 and the power storage device 30. Is arranged. The contactor box 36 includes, for example, one main voltage transmission contactor, two inverter contactors corresponding to each of the inverters 33 and 35, 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 33 and the power storage device 30. The other inverter contactor performs connection and disconnection between the assist inverter 35 and the power storage device 30. These contactors are switched between a connected state and a disconnected state in accordance with, for example, an operation of an ignition key (not shown) and the button 31A of the disconnect switch 31.

  Here, the turning inverter 33, the assisting inverter 35, and the contactor box 36 are arranged side by side on the electrical component mounting bracket 32 in the left and right directions. In this case, the turning inverter 33 is arranged at a position closest to the power storage device 30 in a plan view, the assisting inverter 35 is arranged side by side on the left side of the turning inverter 33, and the contactor box 36 is more than the inverters 33, 35. It is arranged at the left position separated from the power storage device 30.

  Thus, by arranging the turning inverter 33, the assisting inverter 35, and the contactor box 36 in a desired order, the turning inverter 33 and the turning generator / motor 8 can be arranged at close positions. And the assisting power generator / motor 14 can be arranged in a close position. Thereby, the three-phase alternating current cable 34 which connects the inverters 33 and 35 and the generator / motors 8 and 14 can be formed short. In addition, the power supply cable 37 connecting the power storage device 30, the inverters 33 and 35, and the contactor box 36 can also be formed short, and wiring work can be easily performed.

  Next, the structure and function of the notch hole 38 constituting the characteristic part of the present invention will be described in detail.

  Reference numeral 38 denotes a notch hole provided in the footrest portion 16 of the floor member 15. The notch 38 constitutes an escape hole provided so that the turning generator / motor 8 and the footrest 16 do not interfere with each other. Here, the position where the notch hole 38 is formed will be described in detail. First, the cutout hole 38 is located at a position avoiding the operation range where the operation lever / pedal 22 for travel, the operation pedal 23 for reserve, and the operation pedal 24 for swing are operated, specifically, a foot corresponding to the operation range. It is arranged at a position where the work floor portion 16A of the placing portion 16 is avoided. In this case, since the left side of the work floor portion 16A (the door 25A side of the cab box 25) is an entrance for the operator, the cutout hole 38 is formed on the right side of the work floor portion 16A, that is, the floor member 15 and the fuel. It is arranged at a position adjacent to the gap 29 with the tank 28.

  The cut-out hole 38 is provided in the state where the floor member 15 is tilted down as shown in FIG. 8 or when the floor member 15 is tilted up as shown in FIG. In order to avoid such problems, it is formed as a substantially rectangular opening having a sufficient size. Specifically, the cutout holes 38 are formed in almost all of the right side portion of the work floor portion 16 </ b> A in the front and rear directions and a part of the rear side of the lever / pedal attachment portion 18. The notch hole 38 has a trapezoidal portion 38A whose front side that is on the lever / pedal attachment 18 side has a width that decreases toward the front. Thereby, the notch hole 38 can be formed large while avoiding the right opening 18 </ b> C of the lever / pedal mounting portion 18.

  Reference numeral 39 denotes an upward notch hole provided in the wall plate 19 of the floor member 15. The upward notch hole 39 is formed in the wall plate 19 connected to the notch hole 38 by notching from the lower end to the upper side. Thus, even when the turning generator / motor 8 is arranged at a position where the upward cutout hole 39 protrudes to the right from the footrest portion 16 of the floor member 15, the turning generator / motor 8 can be avoided. . The upward notch hole 39 is formed in a step shape so that the front portion where the turning generator / motor 8 is disposed is high and the rear portion is low.

  Reference numeral 40 denotes an electric motor cover attached to the footrest portion 16 of the floor member 15. The motor cover 40 covers the upper portion of the turning generator / motor 8 that protrudes upward from the cutout hole 38. As shown in FIG. 15, the motor cover 40 includes a top plate 41 and a peripheral surface plate 42. In accordance with the step shape of the upward notch hole 39, the top plate 41 includes a flat high plate portion 41A positioned on the front side, a falling portion 41B falling downward from the rear end of the high plate portion 41A, and the standing plate 41A. It is formed by a flat low plate portion 41C extending rearward from the lower end of the lowered portion 41B.

  On the other hand, the peripheral surface plate 42 of the motor cover 40 is formed by a front surface portion 42A, a rear surface portion 42B, and a left surface portion 42C that extend downward from the three sides of the front side, the rear side, and the left side except the right side of the top plate 41. Since the front surface portion 42A of the peripheral surface plate 42 is fitted into the trapezoidal portion 38A of the notch hole 38, the front surface portion 42A is formed in a trapezoidal shape protruding forward along the trapezoidal portion 38A. Thereby, the left front side part of the electric motor cover 40 can be made into a chamfered shape, and the leg hung on the swing operation pedal 24 can be efficiently avoided.

  As shown in FIG. 14, the motor cover 40 configured in this way is inserted into the cutout hole 38 formed in the footrest portion 16 and the right edge of the top plate 41 is cut upward. The wall plate 19 is brought into contact with the notch 39. In this state, the motor cover 40 is welded to the floor member 15 by applying welding means between the peripheral plate 42 and the footrest portion 16 and the lever / pedal mounting portion 18 and between the top plate 41 and the wall plate 19. Installed. By covering and closing the notch holes 38 and 39, the motor cover 40 can prevent the operation noise of the turning power generation / motor 8 and the infiltration of oil and the like, and can improve the appearance.

  Here, in consideration of the fact that the floor member 15 tilts (tilt up and tilt down), the motor cover 40 is arranged on the rear side that easily interferes with the swing generator / motor 8 during the tilt operation. -It is formed so that the space | interval with the electric motor 8 may become large. That is, the rear side of the falling portion 41B of the top plate 41 of the motor cover 40 and the generator / motor 8 for turning is larger than the distance between the front side 42A of the peripheral plate 42 of the motor cover 40 and the generator / motor 8 for turning. The interval is larger, for example, the rear interval is set to about 1.5 to 4 times the front interval. Thereby, even when the floor member 15 is tilted, contact between the turning generator / motor 8 and the motor cover 40 can be reliably prevented.

  In addition, 43 is an exterior cover provided on the right side of the floor member 15, and the exterior cover 43 covers the heat exchanger 12, the hydraulic oil tank 27, the fuel tank 28, and the like. As shown in FIGS. 2 and 3, the exterior cover 43 is provided on the rear side so as to cover the upper side of the heat exchanger 12, and is provided on the front side of the rear cover 43A so as to be opened and closed. 27, a right front cover 43B covering the fuel tank 28, and a partition cover 43C provided facing the side surface of the cab box 25 so as to cover the upper surface from the left surface of the fuel tank 28.

  44 is a control valve provided on the turning frame 6 (see FIG. 18). The control valve 44 is formed by a plurality of hydraulic control valves that control the traveling motors 2E, 2F of the lower traveling body 2 and the cylinders 5D, 5E, 5F of the work device 5. The control valve 44 supplies the pressure oil supplied from the hydraulic pump 13 to the hydraulic actuator corresponding to this operation according to the operation of the operation lever 21 for work.

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

  First, the operator gets on the floor member 15 and sits on the driver's seat 20. By operating the operating lever / pedal 22 for traveling in this state, pressure oil is supplied from the control valve 44 to the traveling motors 2E and 2F of the lower traveling body 2, and the left and right drive wheels 2B are driven. The hybrid excavator 1 can be moved forward or backward.

  On the other hand, the operator seated in the driver's seat 20 operates the operation lever 21 and the swing operation pedal 24 to rotate the upper swing body 4 by the swing device 3 (the power generator / motor 8 for swing) The work device 5 can be moved upside down to perform excavation work of earth and sand.

  Here, the case where the hydraulic pump 13 is driven by the engine 11 and the assisting generator / motor 14 will be described with reference to FIGS. 16 and 17. Reference numeral 45 denotes a rated output characteristic line that is a rated output of the engine 11, and 46 denotes a characteristic line (PQ diagram) of the hydraulic pump 13. This characteristic line 46 is a PQ characteristic of the hydraulic pump 13 when the engine 11 is driven within the rated output (rated output characteristic line 45 of the engine 11). Reference numeral 47 denotes a total output characteristic line when the rated output of the engine 11 is assisted by the output of the assisting generator / motor 14.

  When the lower traveling body 2 is traveled at a low speed (low speed travel region 48), or when normal work is performed using the turning device 3 and the working device 5 (normal work region 49), the hydraulic pump 13 is lightened. What is necessary is just to drive with load. Therefore, when these low-speed traveling region 48 and normal working region 49 are used, the force required to drive the hydraulic pump 13 can be provided only by the rated output of the engine 11.

  On the other hand, when the lower traveling body 2 is traveled at a high speed (high speed travel region 50), the load on the hydraulic pump 13 becomes larger than the light load. May act on the engine 11 and cause an engine stall. As described above, when the high-speed traveling region 50 is used, it is necessary to supply power to the assisting generator / motor 14 from the power storage device 30 and drive the assisting generator / motor 14 to assist the engine 11. That is, the output in this case is shown as a total output characteristic line 47 obtained by adding the output of the assisting generator / motor 14 to the rated output characteristic line 45 of the engine 11. Thereby, the hydraulic pump 13 can be driven against a heavy load. In addition, as the case where the load of the hydraulic pump 13 increases, the high-speed traveling region 50 is illustrated, but the case where the hydraulic actuator is increased by adding a work attachment or the hydraulic actuator is increased in size and becomes a heavy load. Is included.

  Here, when the turning generator / motor 8 is used as the power source of the turning device 3, the height (upper and lower dimensions) of the turning generator / motor 8 is compared with that of the hydraulic type. Therefore, when the floor member 15 is tilted down, the upper electric motor 8 </ b> B interferes with the footrest portion 16 of the floor member 15.

  However, according to the present embodiment, the footrest portion 16 of the floor member 15 is out of the operating range in which the operation lever / pedal 22, the spare operation pedal 23, and the swing operation pedal 24 are operated. A notch hole 38 is provided at a position that is adjacent to the gap 29 on the right side in the left and right directions. In addition, the turning generator / motor 8 of the turning device 3 is provided in the turning frame 6 at a position corresponding to the notch hole 38 so as to penetrate the notch hole 38 and extend upward.

  Therefore, the turning generator / motor 8 is disposed in a state of extending upward through the notch 38. However, since the position of the cutout hole 38 is a position that is out of the operation range where various pedal operations are performed, the turning generator / motor 8 can be disposed at a position that does not interfere with the pedal operation. Moreover, since the position adjacent to the gap 29 with the fuel tank 28 is on the opposite side of the entrance when getting on and off the floor member 15, the turning generator / motor 8 is also used when getting on and off the floor member 15. It won't get in the way.

  As a result, the generator / motor 8 for turning is arranged in the bottom plate 6A of the turning frame 6 in accordance with the notch hole 38 formed at a position outside the operating range on the footrest 16 where the pedal is operated. The turning generator / motor 8 can be disposed at a position where it does not interfere with pedal operation or the like. Thereby, the enlargement of the generator / motor 8 for turning can be suppressed, and the upper turning body 4 can be reduced in size.

  Further, the footrest portion 16 of the floor member 15 is provided with an electric motor cover 40 that covers an upper portion (such as the electric motor 8B) of the turning generator / motor 8 protruding upward from the notch hole 38. As a result, the motor cover 40 can cover the turning generator / motor 8 in the operator's living space on the floor member 15, thereby preventing the operation sound of the turning generator / motor 8 and the intrusion of oil and the like. And can improve the appearance.

  On the other hand, the wall plate 19 extending forward and rearward on the gap 29 side (right side) of the floor member 15 is provided with an upward notch hole 39 that is notched upward from the lower end portion so as to be connected to the notch hole 38. Yes. Therefore, for example, since the turning generator / motor 8 can be arranged at a position protruding from the footrest portion 16 toward the gap 29, the degree of design freedom in this case can be increased.

  Furthermore, the engine 11 has its output set to a value that covers the force required to drive the hydraulic pump 13 with a light load. That is, in the low-speed traveling region 48 and the normal working region 49, the hydraulic pump 13 can be driven only by the output of the engine 11 (rated output characteristic line 45). Therefore, a small engine (small displacement) having a small output can be used as the engine 11. Thereby, with respect to the exhaust gas regulation for purifying the exhaust gas discharged from the engine 11, the output of the engine 11 can be suppressed to a non-regulation target, and the burden due to the regulation can be reduced. As a result, the existing hydraulic excavator can be hybridized at a low cost. In addition, since the engine 11 having a small output is reduced in size as a whole, a space for arranging the devices can be secured around the engine 11, and the upper turning body is reduced as the engine 11 is reduced in size. 4 can also be reduced in size.

  Furthermore, the hydraulic pump 13 can be driven only by the output of the engine 11 in the low-speed traveling region 48 or the normal working region 49 (light load). On the other hand, in the high-speed running region 50 (during heavy load), the hydraulic pump 13 cannot be driven only by the output of the engine 11, so the output of the engine 11 (rated output characteristic line 45) By assisting the output and increasing the output (total output characteristic line 47), the hydraulic pump 13 having a large load pressure can be driven.

  In the embodiment, the case where the substantially rectangular cutout hole 38 is provided across the footrest portion 16 and the lever / pedal attachment portion 18 of the floor member 15 has been described as an example. However, the present invention is not limited to this. For example, a notch hole may be provided only in the footrest portion 16 of the floor member 15. Further, the cutout hole may have another shape such as a circle, an oval, or a pentagon.

  In the embodiment, the case where the power storage device 30 is disposed on the revolving frame 6 in the gap 29 between the floor member 15 and the fuel tank 28 has been described as an example. However, the present invention is not limited to this, and for example, the power storage device may be arranged at another place such as the lower side of the floor member.

1 hybrid compact hydraulic excavators 2 undercarriage 3 turning device 4 upper structure 5 working device 5A boom 5B arm 5C bucket 5D boom cylinder (hydraulic actuator)
5E Arm cylinder (hydraulic actuator)
5F Bucket cylinder (hydraulic actuator)
6 Turning frame 6J Motor mounting hole 8 Turning generator / motor 9 Counterweight 11 Engine 13 Hydraulic pump 14 Assist generator / motor 15 Floor member 16 Foot rest 17 Driver seat mounting section 18 Lever / pedal mounting section 19 Wall plate 20 Driving Seat 22 Driving lever / pedal for driving 23 Operation pedal for spare 24 Operating pedal for swing 27 Hydraulic oil tank (oil storage tank)
28 Fuel tank
29 Clearance 30 Power storage device 38 Notch hole 39 Upward notch hole 40 Motor cover 45 Engine rated output characteristic line 46 Hydraulic pump characteristic line (PQ diagram)
47 Total output characteristic line 48 Low-speed travel area 49 Normal work area 50 High-speed travel area

Claims (4)

A self-propelled crawler-type lower traveling body, and an upper revolving body that is mounted on the lower traveling body via a turning device so as to be capable of turning, and whose rear portion is within the vehicle width of the crawler-type lower traveling body during the turning operation. And a working device provided on the front side of the upper swing body so as to be able to move up and down using a hydraulic actuator as a power source,
The upper swing body is
A swivel having a bottom plate extending in the front and rear directions, and a left vertical plate and a right vertical plate standing on the bottom plate and extending in the front and rear directions with a spacing in the left and right directions. Frame,
A turning generator / motor that is attached to the turning frame and serves as a power source for rotationally driving the turning device;
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 connected to the engine and the hydraulic pump;
A tilt support member is supported on a front portion on one side of the left and right sides of the swivel frame so that the tilt frame can be tilted up and down, and an operator can place a foot on the footrest portion and a rear portion of the footrest portion. A floor member comprising a driver seat mounting portion that rises upward and extends rearward toward the upper side of the engine;
An oil storage tank that is provided in a state where a gap is interposed between the swivel frame and the floor member on the other side in the left and right directions;
A hybrid comprising: a power storage device that feeds 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. Type small hydraulic excavator ,
In the footrest portion of the floor member, a notch adjacent to the gap is located at a position that is out of the operation range for performing various pedal operations and on the opposite side of the entrance when getting on and off the floor member. holes are provided,
The notch hole is formed as an opening that can avoid contact with the turning generator / motor when the floor member is tilted down or tilted up,
The bottom plate of the swivel frame is provided with a motor mounting hole for mounting the power generator / motor for swivel located below the notch hole and between the left vertical plate and the right vertical plate. And
Before Ki旋 times for motor-generator, along with the attached to the bottom plate while being fitted into the motor mounting hole extends above the footrest section of the floor member through said notched hole,
The hybrid small hydraulic excavator , wherein a foot cover of the floor member is provided with an electric motor cover that covers an upper portion of the turning generator / motor projecting upward from the cutout hole . The motor cover is
A ceiling formed by a flat high plate portion located on the front side, a falling portion falling downward from the rear end of the high plate portion, and a flat low plate portion extending rearward from the lower end of the falling portion The board,
The top plate is formed of a front plate, a rear plate, and a left plate that extend downward from the three sides of the front, rear, and left sides, and a peripheral plate that is attached to the footrest of the floor member by welding means. hybrid compact hydraulic excavator according it has to claim 1 you characterized. The floor member in order to partition between the gap, before along the side edges of the driver's seat mounting portion and the footrest section, has a wall plate erected so as to extend in the rear direction,
Wherein the wallboard, hybrid compact hydraulic excavator according to claim 1 you, characterized in that the upward notched hole provided from the lower end portion in notched upward at the position leading to the notched hole. The output of the engine, catering the force required to drive the hydraulic pump with a light load, the the load of the hydraulic pump is larger than the light load, the output of the previous SL assisting motor-generator is hybrid compact hydraulic excavator according to claim 1 you, characterized in that to assist the output of the engine.

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