JP2011089369A - Working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a working vehicle constituted to restrain heat generated from equipment such as a hydraulic pump and an electric motor, from having influence on a battery while effectively utilizing the internal space of a vehicle body. <P>SOLUTION: A backhoe includes a swivel base 11 mounted on a travel device; a boom or the like mounted to the front part of the swivel base 11; and a driving force generating part provided inside the swivel base 11. The driving force generating part includes the hydraulic pump 63 supplying pressure oil for operating the boom or the like, the electric motor 60 driving the hydraulic pump 63, and a battery 13 supplying electric power to the electric motor 60. A main frame 70 of substantially box shape having a substantially closed space 76 is provided inside the swivel base 11. The main frame 70 includes a frame-like member 71 disposed on the floor face of the swivel base 11 and having an upper opening, and a partition plate 75 closing the upper opening of the rectangular frame-like member 71. The hydraulic pump 63 and the electric motor 60 are arranged inside the main frame 70, and the battery 13 is arranged on the partition plate 75 outside the main frame 70. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a work vehicle configured to include a vehicle body frame attached on a traveling body and a work device attached to a turntable provided on the vehicle body frame or on the vehicle body frame so as to be turnable.

  As a work vehicle as described above, for example, a work vehicle that can excavate the ground, such as a backhoe (see Patent Document 1), is supported on a traveling body so as to be rotatable around a vertical axis. A working device (power shovel device) having a swivel base and having a swingable boom is attached to the front part of the swivel base. The rear part of the swivel base is provided with an engine room that is covered with a bonnet and accommodates the engine, and includes a hydraulic pump, a hydraulic oil tank that stores hydraulic oil for hydraulic equipment, a swivel motor that swivels the swivel base, and the like. Is provided. Furthermore, a counterweight is provided at the rear of the swivel to balance the weight with the work device attached to the front of the swivel.

  Conventionally, the power source of such a work vehicle is an engine, and a traveling pump is driven by the engine, and a hydraulic pump that supplies pressure oil for operating a power shovel device, a swing motor, and the like is driven by the engine. It is configured. On the other hand, in recent years, taking into consideration the influence on the surrounding environment, such as not exhausting exhaust gas and reducing noise, there is also a type in which the working device is operated by driving a hydraulic pump by an electric motor instead of an engine. In this case, electric power is supplied by connecting an electric motor provided in the swivel base to a commercial power source or a generator via a power cable.

JP-A-2005-273145

  By the way, in the electric motor type work vehicle as described above, it is necessary to install a commercial power source or a generator nearby, and it is difficult to operate the working device if there is no such nearby. . In addition, since a power cable is connected to the worker, the range in which the work vehicle can move is determined by the length of the power cable, and the work range of the work vehicle is limited. Furthermore, excessive tension is applied to the power cable during the operation, which may cause the power cable to be disconnected.

  For this reason, it is becoming practical to use a battery instead of a commercial power source or a generator as a power supply source for an electric motor. Recently, a high-capacity secondary battery is often used as a battery. In this case, however, there were the following problems. When equipment such as a hydraulic pump or an electric motor is operating, such equipment generates heat, so the temperature around the battery installed inside the vehicle body (inside the body frame or inside the swivel) together with the equipment such as the hydraulic pump. Also gets higher. When the temperature around the battery rises, there is an effect that the life of the battery is shortened, and in order to suppress such problems, the battery must be arranged so as not to be affected by the heat generated by the device. However, since space for installing devices such as a hydraulic pump and an electric motor and a battery inside the vehicle body is limited, it is necessary to take measures against heat generation in consideration of these installation spaces.

  The present invention has been made in view of such a problem. A work vehicle having a configuration capable of suppressing the influence of heat generated by a device such as a hydraulic pump or an electric motor on a battery while effectively using a space inside the vehicle body. The purpose is to provide.

  In order to solve the above problems, a work vehicle according to the present invention (for example, the backhoe 1 in the embodiment) includes a vehicle body frame mounted on a traveling body (for example, the traveling device 3 in the embodiment), a vehicle body frame, or a vehicle body frame. A work device (for example, the boom 25 in the embodiment) attached to a swivel provided in a freely swingable manner and a drive for generating a driving force provided in the body frame or the swivel for operating the work device. A working vehicle having a force generating unit, wherein the driving force generating unit supplies a hydraulic pump that supplies pressure oil for operating the working device, an electric motor that drives the hydraulic pump, and supplies electric power to the electric motor A substantially box-shaped support frame (for example, a substantially enclosed space inside the body frame or inside the swivel base). The main frame 70) in the embodiment includes a frame-shaped member that is disposed on the floor surface of the vehicle body frame or the swivel base and has an upper opening, and a partition plate that closes the upper opening of the frame-shaped member. The hydraulic pump and the electric motor are arranged inside the support frame, and the battery is arranged outside the support frame and on the partition plate.

  The work vehicle configured as described above further includes an intermediate frame (for example, the subframe 80 in the embodiment) that separates the support frame and the battery bottom surface by a predetermined distance in the vertical direction. It is preferred that

  Further, in the work vehicle having the above-described configuration, a cooling fan that sucks outside air is provided inside the support frame, and the support frame has an intake hole (for example, an implementation) that introduces outside air into the substantially sealed space from the outside by the operation of the cooling fan. It is preferable to provide a rear vent 73a) in the form and an exhaust hole (for example, the front vent 72a in the embodiment) for discharging outside air that has passed through the substantially sealed space to the outside.

  Further, in the work vehicle having the above configuration, a heater device that supplies warm air outside the support frame and substantially facing the exhaust hole is provided, and the heater device is warmed up by receiving outside air discharged from the exhaust hole. It is preferred that

  Further, in the work vehicle having the above-described configuration, the output shaft of the electric motor and the input shaft of the hydraulic pump are connected in series via a coupling with the housing end surface of the electric motor and the casing end surface of the hydraulic pump facing each other. A spacer (for example, the spacer 58 in the embodiment) for forming a predetermined gap between the housing end surface and the casing end surface is preferably interposed.

  Further, in the work vehicle having the above configuration, a housing fitting portion (for example, the housing recess 51a in the embodiment) formed on the housing end surface and a casing fitting portion (for example, the casing protrusion in the embodiment) formed on the casing end surface. 54a) is fitted to form an inlay structure for positioning the electric motor and the hydraulic pump, and one end face fitting portion formed on the one end face side so as to be able to fit the housing fitting portion (for example, the embodiment) And the other end face fitting portion (for example, the fitting hole 159a in the embodiment) on the other end surface side, and an auxiliary member having an inlay structure. It is preferable that the joint part and the casing fitting part are connected via an auxiliary member.

  According to the work vehicle of the present invention, the hydraulic pump and the electric motor that generate heat are arranged in a substantially sealed space inside the support frame, and the battery is arranged on the partition plate outside the support frame. By partitioning the storage space for the electric motor and the storage space for the battery, it is possible to suppress the heat generated from the hydraulic pump and the electric motor from being radiated to the battery side, thereby suppressing the thermal effect on the battery. Become. In addition, since the hydraulic pump, the electric motor, and the battery are arranged in two stages up and down by the support frame, the space inside the vehicle body frame or the swivel base in which these are arranged is effectively utilized, and the remaining in these interiors. It is possible to secure a wide space for arranging the equipment, and it is possible to improve the stability of the vehicle by preventing the center of gravity of the body frame or the swivel from becoming higher.

  Further, by providing an intermediate frame that separates the support frame and the battery, heat from the hydraulic pump and the electric motor is also radiated from the intermediate frame through the support frame, so that the influence of heat on the battery is further reduced. It becomes possible to keep it low.

  Further, by providing a cooling fan that sucks outside air as cooling air into the support frame, the working device is activated (the hydraulic pump and the electric motor are activated), and these hydraulic pumps themselves generate heat, When the atmospheric temperature in the support frame rises due to this heat generation, the hydraulic pump and the electric motor can be cooled by sucking cooling air into the support frame through the intake holes by the cooling fan. The air heated inside can be discharged to the outside through the exhaust hole. Therefore, it is possible to more effectively suppress the thermal influence on the battery by suppressing the temperature rise in the substantially sealed space of the devices such as the hydraulic pump and the electric motor and the support frame.

  Further, since the heater device is provided outside the support frame and substantially at the position facing the exhaust hole, the air heated in the support frame can be blown to the heater device by the cooling fan. Can be warmed up accurately and can contribute to energy saving for driving the heater device.

  Furthermore, in the connection structure between the hydraulic pump and the electric motor, the spacer is interposed between the housing end surface and the casing end surface so as to form a predetermined gap. It is possible to radiate the heat of the hydraulic pump that becomes high temperature to the outside through the gap between the two. Therefore, heat transfer from the hydraulic pump to the electric motor can be suppressed and the electric motor can be prevented from becoming excessively high in temperature, thereby contributing to the effect of suppressing the thermal influence on the battery.

  In addition, the housing fitting portion and the casing fitting portion constituting the inlay structure are connected via an auxiliary member, so that the gap between the housing end surface and the casing end surface is increased to dissipate heat from the hydraulic pump. Even when a spacer having a large thickness is interposed for further promotion, the hydraulic pump and the electric motor can be properly positioned and connected by the inlay structure via the auxiliary member. Further, since the substantial contact portion between the hydraulic pump and the electric motor can be limited to the spacer and the auxiliary member interposed therebetween, for example, these members are formed of a material having low thermal conductivity. Thus, heat transfer from the hydraulic pump to the electric motor can be more accurately shielded.

1 is a perspective view showing a work vehicle according to an embodiment of the present invention. It is a block diagram which shows the structure of the hydraulic equipment etc. which were provided in the said work vehicle. It is a top view of the turntable provided in the said work vehicle. It is a side view of the turntable provided in the work vehicle. It is principal part sectional drawing which shows arrangement | positioning of the electric motor, hydraulic pump, battery, etc. which were provided in the said work vehicle. It is a side view which shows the connection state of an electric motor and a hydraulic pump. It is a side view which shows the modification of the connection state of an electric motor and a hydraulic pump. It is an exploded view in the said modification.

  Hereinafter, a preferred embodiment of the present invention will be described with reference to FIGS. As a construction machine of the present embodiment, a backhoe used when excavating the ground or moving excavated soil or the like will be described as an example. For convenience of explanation, the directions of the arrows shown in FIG. 1 will be referred to as front and rear, left and right, and up and down, respectively.

  As shown in FIG. 1, the backhoe 1 includes a travel device 3 having a pair of left and right crawler travel mechanisms, a swivel base 11 that is turnably provided on the travel device 3 to form a vehicle body frame, A power shovel device 20 pivotally connected to the front portion and an operator cabin 15 provided on the upper part of the swivel base 11 are configured.

  The traveling device 3 is configured by providing crawler traveling mechanisms on the left and right of the traveling frame 7, each composed of a driving wheel 4, a driven wheel 5, and a crawler belt 6 wound around the driving wheel 4 and the driven wheel 5. ing. The drive wheel 4 provided on the left side is rotationally driven by a left travel motor 39a (see FIG. 2), and the drive wheel 4 provided on the right side is rotationally driven by a right travel motor 39b (see FIG. 2). ing. A swivel base 11 is provided at the center upper portion of the traveling frame 7, and the swivel base 11 can be horizontally swiveled by a swivel motor 37 (see FIGS. 2 and 3) attached thereto. A main body connecting portion 11 a is formed at the lower front end of the swivel base 11 so as to protrude forward.

  The power shovel device 20 includes a boom 25 that is pivotable up and down with a base end pivotally connected to a main body pivoting portion 11a of the swivel base 11, and a boom 25 that is pivotally coupled to the tip of the boom 25 and can swing up and down. The arm 27 is configured to have a bucket 29 pivotally connected to the tip of the arm 27 so as to swing up and down. The boom 25 can be raised and lowered by a boom cylinder 31 pivoted between the main body pivot portion 11 a of the swivel base 11 and the lower surface of the boom 25, and the arm 27 is pivoted between the upper surface of the boom 25 and the base of the arm 27. The arm 29 can be bent and extended, and the bucket 29 can swing up and down by a bucket cylinder 35 pivotally connected between the upper surface of the arm 27 and the base of the bucket 29. Note that the boom cylinder 31, the arm cylinder 33, the bucket cylinder 35, the swing motor 37, and the traveling motor 39 that receive the supply of pressure oil to operate each part of the backhoe 1 are collectively referred to as “hydraulic actuator 30” in the following description. (Refer to FIG. 2).

  In the operator cabin 15, an operator seat 17 on which an unillustrated operator sits facing the power shovel device 20 is provided. A travel operation device 8 for operating the drive of the left and right drive wheels 4 is disposed at the end of the bottom plate 16 in the operator cabin 15 and on the front side in the front-rear direction (the power shovel device 20 side) from the operator seat 17. Yes. The traveling operation device 8 has a pair of left and right traveling operation levers 8a and 8b, and these traveling operation levers 8a and 8b are configured to be tiltable back and forth with respect to the neutral position. In addition, on the left and right sides of the operator seat 17, work operation devices 21 for operating the drive of the power shovel device 20 are disposed. The work operation device 21 includes a left work operation lever 21a and a right work operation lever 21b, and these work operation levers 21a and 21b are configured to be tiltable forward, backward, left and right with respect to a neutral position.

  When the travel operation levers 8a and 8b are tilted forward in the front-rear direction, the corresponding drive wheels 4 are rotationally driven in the forward direction (forward rotation direction), and the travel operation levers 8a and 8b tilt forward in the front-rear direction. When operated, the corresponding drive wheel 4 is rotationally driven in the reverse direction (reverse direction). Therefore, when the left and right traveling operation levers 8a and 8b are tilted to the front side in the front-rear direction, the vehicle (backhoe 1) travels forward, and when the left and right traveling operation levers 8a and 8b are tilted to the rear side in the front-rear direction. The vehicle travels backward. At this time, the left and right traveling operation levers 8a and 8b can be turned by making the rotation angles of the left and right drive wheels 4 and 4 different by differentiating the tilt angles of the left and right traveling operation levers 8a and 8b. By tilting one of them and holding the other in the neutral position, one of the left and right drive wheels 4, 4 can be rotationally driven and the other can be held stationary to pivot the vehicle.

  When the left operating lever 21a is tilted forward in the front-rear direction, the arm 27 bends and extends upward, and when the left operating lever 21a is tilted back in the front-rear direction, the arm 27 bends and extends downward. When the lever 21a is tilted to the left in the left-right direction, the swivel base 11 turns left, and when the left operation lever 21a is tilted to the right in the left-right direction, the swivel base 11 turns right. . On the other hand, when the right operating lever 21b is tilted forward in the front-rear direction, the boom 25 is tilted down, and when the right operating lever 21b is tilted back in the front-rear direction, the boom 25 is lifted up, and the right operating lever The bucket 29 is configured to excavate when the left side 21b is tilted to the left in the left-right direction, and the bucket 29 is dumped when the right control lever 21b is tilted to the right in the left-right direction.

  The work operation device 21 is configured so that the left operation lever 21a and the right operation lever 21b can be tilted in an oblique direction. For example, when the left operation lever 21a is tilted to the right front side, the tilt direction The swing motor 37 and the arm cylinder 33 are simultaneously driven at a ratio of the operating speed corresponding to the rotation speed, so that the swivel base 11 is turned right and the arm 27 is bent upward and downward.

  As shown in FIG. 2, the controller 100 that is provided inside the swivel base 11 and controls the overall operation of the power shovel device 20 is operated by the operation devices 8 and 21 when the operation devices 8 and 21 are operated. In response to the signal, the hydraulic control valve 90 outputs a control signal, and the hydraulic control valve 90 performs hydraulic oil supply / discharge control to the hydraulic actuator 30 based on the control signal from the controller 100. When the hydraulic control valve 90 receives a control signal from the controller 100, the hydraulic control valve 90 supplies and discharges the hydraulic oil discharged from the hydraulic pumps 53 and 63 that can be driven by the driving force of the electric motors 50 and 60 disposed on the swivel base 11. Control is performed to drive the crawler belt 6 (drive wheel 4), to turn the swivel base 11, to move the boom 25 up and down, to bend and extend the arm 27, and to operate the bucket 29.

  The hydraulic control valve 90 includes travel control valves 99a and 99b corresponding to the travel motors 39a and 39b for driving the left and right drive wheels 4 to rotate, a swing control valve 97 corresponding to the swing motor 37 for swinging the swivel base 11, and the boom 25. A boom control valve 91 corresponding to the boom cylinder 31 for raising and lowering the arm 27, an arm control valve 93 corresponding to the arm cylinder 33 for bending and extending the arm 27, and a bucket control valve 95 corresponding to the bucket cylinder 35 for operating the bucket 29. Configured. The supply / discharge control of the hydraulic fluid flowing through the hydraulic actuator 30 controls the valve opening degrees of the boom control valve 91, the arm control valve 93, the bucket control valve 95, the swing control valve 97, and the travel control valve 99 in the hydraulic control valve 90. Is done. Then, the backhoe 1 travels by the rotational drive of the travel motor 39, the swivel base 11 swings by the rotational drive of the swing motor 37, the boom 25 moves up and down by the expansion and contraction operation of the boom cylinder 31, and the arm cylinder 33 expands and contracts. As a result, the arm 27 bends and extends, and the bucket 29 is scraped and discharged by the expansion and contraction of the bucket cylinder 35. Further, when a control signal is output from the controller 100 to the motor variable speed control device (inverter) 110, the rotational speed of the electric motors 50 and 60 is thereby changed, or the electric motors 50 and 60 output an appropriate torque. To be controlled.

  Here, the structure of the swivel base 11 and examples of the arrangement of various devices disposed therein will be described. As shown in FIGS. 3 and 4, the swivel base 11 is mainly composed of a base substrate 19, an upper cover 41, and a lower cover 42, and each device disposed on the base substrate 19 includes these covers 41, 42. Therefore, an accommodation space for each device is formed inside the swivel base 11.

  The upper cover 41 extends from the lower side of the operator seat 17 toward the rear end of the swivel base 11 and covers the battery storage portion 12 that can store the battery 13 and is located behind the operator seat 17. The upper cover 41 includes an upper cover body 41a fixed to the lower cover 42 and the like, and an upper cover lid 41b detachably attached to the upper cover body 41a by screw fastening or the like. By removing 41b from the upper cover body 41a and opening the battery storage unit 12, it becomes possible to easily perform maintenance such as replacement of the battery 13 (removal and storage of the battery 13) from the rear side of the vehicle. Yes.

  The lower cover 42 extends in the front-rear direction below the upper cover 41 at the left and right sides and the rear part of the swivel base 11. The lower cover 42 is formed with an intake port 42a that opens in the front-rear direction. When a cooling fan 45 described later is operated, outside air is sucked into the swivel base 11 as cooling air through the intake port 42a. Is possible. Further, the base substrate 19 is formed with an exhaust port 19a that opens up and down. When the cooling fan 45 is operated, a part of the base plate 19 that has been warmed by passing through the inside of the swivel base 11 through the exhaust port 19a is formed. It is possible to discharge air to the outside.

  The swivel base 11 has a substantially U-shape in plan view, and is supported on the travel frame 7 of the travel device 3 via a swivel bearing 18 so as to be pivotable about the swivel axis X. A rotary joint 18a supported by the traveling frame 7 of the traveling device 3 is disposed at the center of the slewing bearing 18, and hydraulic oil from the hydraulic control valve 90 on the swivel base 11 passes through the rotary joint 18a. Thus, it is configured to be supplied to a traveling motor 39 or the like on the traveling device 3 side. A heater device 14 for blowing warm air into the operator cabin 15 is disposed inside the swivel base 11 and below the operator seat 17.

  A first electric motor 50 and a second electric motor 60 that are driven by being supplied with electric power from the battery 13 are arranged side by side in the front-rear direction horizontally in the center of the swivel base 11 and in a substantially central portion in the left-right direction. Has been. In front of the first electric motor 50, the hydraulic oil is driven by the first electric motor 50 and is operated by the boom cylinder 31, the arm cylinder 33, the bucket cylinder 35, or the traveling motor 39 (intake from the hydraulic oil tank 46). The first hydraulic pump 53 that discharges the hydraulic oil as pressure oil is disposed horizontally. On the other hand, in front of the second electric motor 60, the hydraulic oil is driven by the second electric motor 60 to operate the turning motor 37 or a pilot valve (not shown) (hydraulic oil sucked from the hydraulic oil tank 46). ) Is discharged horizontally as pressure oil, and is disposed horizontally. It should be noted that two electric motors and hydraulic pumps are arranged in this way, and when one set is used, the outer shape (capacity) becomes large and it is difficult to secure the arrangement space, and traveling, excavation, etc. This is because almost all of the hydraulic actuators 30 are not operated at the same time in this work, and the motor and pump efficiency can be improved by providing two sets independent from each other from the viewpoint of energy saving.

  The electric motors 50 and 60 and the hydraulic pumps 53 and 63 are accommodated in a main frame 70 having a substantially rectangular box shape in the lower cover 42. The main frame 70 includes a rectangular frame member 71 formed by joining a front plate 72 such as a flat steel plate standing on the base substrate 19, a rear plate 73, and left and right side plates 74, 74 by welding or the like. And a partition plate 75 that is formed in a flat plate shape from a material having a low thermal conductivity (for example, a synthetic resin having a low thermal conductivity) and closes the upper opening of the rectangular frame-shaped member 71, and this main frame. The electric motor 50, 60, the hydraulic pumps 53, 63, etc. can be accommodated inside 70, and there is no opening other than the vent holes 72a, 73a formed in the front and rear plates 72, 73. A substantially sealed space 76 is formed in a state in which communication with 12 is substantially blocked. Thereby, the atmosphere in the main frame 70 (substantially sealed space 76) is prevented from entering the battery storage unit 12.

  A sub frame 80 is fixed on the upper surface side of the main frame 70, and the battery storage portion 12 is formed in the upper cover 41 and on the sub frame 80. As shown in FIG. 5, the sub-frame 80 has a pair of front and rear prismatic intermediate members fixed to the upper surface of the end that is bent inward in a substantially L shape on the front plate 72 and the lower plate 73 of the main frame 70. It comprises a block 81, 81 and a rectangular plate-like support plate 82 held by the pair of intermediate blocks 81, 81. Between the support plate and the partition plate of the main frame, the intermediate block 81 is provided. Is interposed, the two are separated by a predetermined distance (the thickness of the intermediate block 81).

  In the battery storage unit 12, the battery 13 is placed and held on the upper surface of the support plate 82 of the subframe 80 as a power supply source for the electric motors 50 and 60. Examples of the battery 13 include a high-capacity rechargeable lithium ion battery or an organic radical battery, and a large number of small battery assemblies are accommodated in a box-type battery box and formed as one unit.

  In this way, the devices such as the electric motors 50 and 60, the hydraulic pumps 53 and 63, and the battery 13 are arranged using the inside of the swivel base 11, but the devices such as the hydraulic pumps 53 and 63 and the electric motors 50 and 60 are arranged. Since such a device generates heat when the is operating, there is an effect that the temperature of the surrounding atmosphere increases with the devices such as the hydraulic pumps 53 and 63. Accordingly, if the temperature around the battery 13 becomes high, the output and life of the battery 13 are adversely affected. Therefore, it is necessary to suppress the temperature rise of the battery 13. In the present embodiment, as described above, the electric motors 50 and 60 and the hydraulic pumps 53 and 63 that also serve as heat sources are arranged in a substantially sealed space 76 in the main frame 70, so Since the sealed space 76) and the battery storage 12 are partitioned, heat generated from devices such as the hydraulic pumps 53 and 63 is prevented from being transferred to the battery 13 (dissipated). It is possible to suppress the thermal effect. Further, since the subframe 80 is provided on the main frame 70 and the battery 13 is stored in a state where the partition plate 75 and the support plate 82 are spaced apart from each other by a predetermined distance, the thermal influence on the battery 13 is further suppressed. It becomes possible.

  Further, in such a configuration, the electric motors 50 and 60 and the hydraulic pumps 53 and 63 are arranged side by side horizontally, and the battery 13 is arranged above both via the frames 70 and 80. The space inside the rear side is effectively utilized, and it is possible to secure a wide space for arranging the remaining devices inside the swivel base 11 and to prevent the center of gravity of the swivel base 11 from becoming high. The stability of the vehicle can be improved. If the battery 13 is placed inside the swivel base 11 and on the lower rear base substrate 19, it is necessary to form the lower cover 42 as a lightweight steel plate cover in consideration of battery replacement. Although it becomes difficult to function as a counterweight for balancing the weight with a work device (boom 25 or the like) provided at the front portion of the swivel base 11, the battery 13 is connected by the frames 70 and 80 as described above. By holding on the upper side, the lower cover 42 can be formed as a heavy cast cover (counterweight).

  Furthermore, since a so-called ramen structure is formed by the frames 70 and 80, each plate such as the support plate 82 for holding the battery 13 can be reduced in thickness and weight, and high rigidity can be secured. .

  At this time, the atmosphere in the substantially sealed space 76 of the main frame 70 is exposed to a high temperature due to the heat generated by the electric motors 50 and 60 and the hydraulic pumps 53 and 63. The motors 50 and 60 and the hydraulic pumps 53 and 63 themselves may be greatly affected by heat. For this purpose, a pair of cooling fans 45, 45 that are operated by a motor (not shown) that can be driven by power supply from the battery 13 are provided in the main frame 70 and facing the rear vent 73a. The outside air (air) sent into the swivel base 11 through the air inlet 42a by the operation of the cooling fan 45 (forward rotation operation) flows into the main frame 70 through the rear vent 73a. The air introduced into the main frame 70 flows forward while absorbing heat by contacting the electric motors 50 and 60 and the hydraulic pumps 53 and 63 that generate heat, and a part of the warm air is The gas is discharged from the exhaust port 19a of the base substrate 19 to the outside. As a result, the electric motors 50 and 60 and the hydraulic pumps 53 and 63 are accurately cooled, so that the temperature increase of the electric motors 50 and 60 and the hydraulic pumps 53 and 63 can be suppressed, and the battery 13 It becomes possible to reduce a thermal influence more effectively.

  On the other hand, of the warmed air, the air discharged from the front vent 72a to the outside of the main frame 70 is guided to the heater device 14 side facing the front plate 72 in which the front vent 72a is formed, Since the heater device 14 is warmed up by supplying heat by flowing around the heater device 14, it is possible to contribute to energy saving for driving the heater device 14. Moreover, since the heating efficiency by the heater device 14 is improved, the heater device 14 can be downsized.

  Next, a connection structure between the electric motors 50 and 60 accommodated in the main frame 70 and the hydraulic pumps 53 and 63 will be described. In addition, since the connection structure of the 1st electric motor 50 and the 1st hydraulic motor 53 and the connection structure of the 2nd electric motor 60 and the 2nd hydraulic pump 63 are substantially the same structures, here, the 1st electric motor 50 and Only the connection structure with the first hydraulic pump 53 will be described as an example to avoid redundant description.

  As shown in FIG. 6, the first electric motor 50 and the first hydraulic pump 53 are configured such that an output shaft 52 of the first electric motor 50 and an input shaft 55 of the first hydraulic pump 53 are connected in series via a coupling 56. It is integrally arranged on a pedestal (not shown) in a connected state.

  A casing projection 54a is formed in the casing 54 of the first hydraulic pump 53 so as to protrude in the axial direction, and a housing recess 51a corresponding to the outer shape of the casing projection 54a is formed in the housing 51 of the first electric motor 50. As a result, a so-called inlay structure is formed in which the casing convex portion 54a and the housing concave portion 51a are detachably fitted. Therefore, by fitting the casing convex portion 54a of the first hydraulic pump 53 into the housing concave portion 51a of the first electric motor 50, the first hydraulic pump 53 and the first electric motor 50 are positioned substantially coaxially. It has become. At this time, even if the shaft centers of the output shaft 52 of the first electric motor 50 and the input shaft 55 of the first hydraulic pump 53 do not completely coincide with each other and are slightly shifted, a coupling 56 is interposed between the shafts. For this reason, the output shaft 52 of the first electric motor 50 and the input shaft 55 of the first hydraulic pump 53 are connected so as to transmit the rotational driving force appropriately.

  By the way, when the electric motor and the hydraulic pump are conventionally connected in series as described above, if the casing end surface of the hydraulic pump and the housing end surface of the electric motor come into contact with each other with a wide contact area, the heat balance causes relative Heat is dissipated from the hydraulic pump, which has a high temperature (for example, about 100 ° C.), to the electric motor, which has a relatively low temperature (for example, about 60 ° C.), through this contact surface, and the temperature of the electric motor increases excessively. There was a problem of inducing failure.

  Therefore, in the present embodiment, the first electric motor 50 and the first hydraulic pump 53 are screw-fastened using a plurality of fixing screws 57 with the end face of the housing 52 and the end face of the casing 54 facing each other. A spacer 58 having a predetermined thickness is interposed between the end face and the end face of the casing 54. The spacer 58 is formed in a disc shape using a material having low thermal conductivity (for example, synthetic resin having low thermal conductivity), and a screw portion (male screw portion) of a fixing screw 57 is formed at the center thereof. It has a screw insertion hole that can be inserted. Therefore, when the first electric motor 50 and the first hydraulic pump 53 are connected in series as described above, a certain gap is formed between the first electric motor 50 and the first hydraulic pump 53 by the spacer 58. Therefore, the contact area between the end faces is reduced, heat radiation (heat transfer) from the first hydraulic pump 53 to the first electric motor 50 is largely blocked, and the heat generated by the first hydraulic pump 53 is the end face of the casing 54. Since heat is also radiated from the gap between the housing 51 and the end face of the housing 51, the first electric motor 50 can be significantly suppressed from becoming high temperature, and the effect of suppressing the temperature rise of the battery 13 is also achieved. can get.

  In such a connection structure, by increasing the thickness of the spacer 58 and increasing the gap between the end face of the housing 51 and the end face of the casing 54, the heat generated by the first hydraulic pump 53 can be more accurately externalized. Although it is possible to dissipate heat, if this gap is made too large, the end faces (housing recess 51a and casing protrusion 54a) will be separated from each other, and the housing recess 51a and casing protrusion 54a will fit at that position. There is a risk of being unable to match.

  Therefore, as shown in FIGS. 7 and 8, an auxiliary member 159 may be interposed between the housing recess 51a and the casing protrusion 54a in the spigot structure. The auxiliary member 159 is formed in a substantially disk shape using a material having low thermal conductivity, and a fitting hole 159a that can be fitted to the casing convex portion 54a of the first hydraulic pump 53 on the front side, and the rear side. The first electric motor 50 has a housing recess 51a and a projection 159b that can be fitted. Therefore, even when a spacer 158 having a large thickness is interposed between both end portions to secure a larger gap therebetween, the first electric motor 50 and the first hydraulic pump 53 are connected by the inlay structure via the auxiliary member 159. It is positioned properly and the heat generated by the first hydraulic pump 53 can be dissipated to the outside through the gap between the two. Further, the first hydraulic pump 53 emits a structure in which a spacer 158 and an auxiliary member 159 having low thermal conductivity are interposed in a substantial coupling portion (contact portion) between the motor housing 51 and the pump casing 54. Heat can be accurately shielded and heat transfer to the first electric motor 50 can be significantly suppressed. Therefore, according to such a connection structure, the temperature rise of the first electric motor 50 can be further suppressed.

  As described above, according to the work vehicle according to the present embodiment, devices such as the electric motors 50 and 60 and the hydraulic pumps 53 and 63 have a thermal effect on the battery while effectively using the space inside the swivel base 11. It is possible to suppress the effect.

  Although the embodiments of the present invention have been described so far, the scope of the present invention is not limited to the above-described embodiments. For example, in the above-described embodiment, the vent holes 72a and 73a are formed in the front plate 72 and the rear plate 73 of the main frame 70, respectively, and external air (cooling air) is directed from the vehicle rear side to the front side by the operation of the cooling fan 45. Although it is configured to circulate, the present invention is not limited to this, and the arrangement of the air vents and the cooling fan so that the cooling air can be circulated in the left-right direction of the vehicle and the cooling air can be circulated in the vertical direction of the vehicle. The configuration may be changed as appropriate and applied.

  In the above-described embodiment, the backhoe 1 has been described as an example of a work vehicle. However, the work vehicle according to the present invention is not limited to this, and an aerial work vehicle, a mobile crane, a forklift, a wheel loader. Etc. For example, in an aerial work vehicle, a swivel base is provided on the body frame, and a work device such as a boom is attached to the swivel base. The arrangement or the like may be configured as in the above embodiment. Further, for example, in a forklift, a working device made of a fork or the like is attached to the front portion of the vehicle body frame. However, the arrangement of the devices constituting the driving force generator provided inside the vehicle body frame is described in the above embodiment. You may comprise as follows.

1 Backhoe (work vehicle)
3 Traveling device (traveling body)
11 swivel base 13 battery (driving force generating part)
14 Heater device 20 Power shovel device (working device)
25 Boom (Working device)
27 Arm (Working device)
29 bucket (working equipment)
45 Cooling fans 50, 60 Electric motor (drive force generator)
51a Housing recess (housing fitting part)
52 Output shaft 53, 63 Hydraulic pump (drive force generator)
54a Casing convex part (casing fitting part)
55 Input shaft 56 Coupling 58, 158 Spacer (spacer)
70 Main frame (support frame)
71 Frame-shaped member 72a Front vent (exhaust hole)
73a Rear vent (intake hole)
75 Partition plate 76 substantially sealed space 80 subframe (intermediate frame)
159a Insertion hole (other end face fitting part)
159b Protruding part (one end face fitting part)

Claims (6)

A vehicle body frame mounted on the traveling body, a work device attached to the vehicle body frame or a turntable provided to be turnable on the vehicle body frame, and the work provided in the vehicle body frame or the turntable. A working vehicle having a driving force generator for generating a driving force for operating the device,
The driving force generator includes a hydraulic pump that supplies pressure oil for operating the working device, an electric motor that drives the hydraulic pump, and a battery that supplies power to the electric motor. ,
A substantially box-shaped support frame having a substantially sealed space inside the vehicle body frame or inside the swivel,
The support frame includes a frame-shaped member that is disposed on the floor surface of the vehicle body frame or the swivel base and has an upper opening, and a partition plate that closes the upper opening of the frame-shaped member,
The hydraulic pump and the electric motor are disposed inside the support frame;
A work vehicle characterized in that the battery is disposed outside the support frame and on the partition plate.   2. The work vehicle according to claim 1, further comprising an intermediate frame between the upper surface of the support frame and the bottom surface of the battery that separates the two in the vertical direction by a predetermined distance. A cooling fan for sucking outside air is provided inside the support frame,
The support frame is provided with an intake hole for introducing outside air into the substantially sealed space from the outside by the operation of the cooling fan, and an exhaust hole for discharging outside air that has passed through the substantially sealed space to the outside. The work vehicle according to claim 1, wherein the work vehicle is a vehicle. A heater device that supplies warm air outside the support frame and substantially facing the exhaust hole is provided.
The work vehicle according to claim 3, wherein the heater device is warmed up by receiving outside air discharged from the exhaust hole. The output shaft of the electric motor and the input shaft of the hydraulic pump are connected in series via a coupling in a state where the housing end surface of the electric motor and the casing end surface of the hydraulic pump face each other.
The work vehicle according to any one of claims 1 to 4, further comprising a spacer for forming a predetermined gap between the housing end surface and the casing end surface. An inlay structure is formed for positioning the electric motor and the hydraulic pump by fitting a housing fitting portion formed on the housing end surface and a casing fitting portion formed on the casing end surface,
Provided with an auxiliary member having one end surface fitting portion formed on one end surface side so as to be able to be fitted with the housing fitting portion, and the other end surface fitting portion capable of being fitted on the other end surface side with the casing fitting portion. ,
The work vehicle according to claim 5, wherein the housing fitting portion and the casing fitting portion constituting the inlay structure are connected via the auxiliary member.

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