JP4863142B2 - Work vehicle - Google Patents

Description

  The present invention relates to a work vehicle having a movable portion that is operated by a working fluid.

2. Description of the Related Art Conventionally, a reach forklift is known as a work vehicle that includes a pair of left and right reach legs that extend forward at the front of a vehicle body, and a lift device that is movable in the front-rear direction along the reach legs. (For example, refer to Patent Document 1).
The lift device of the reach forklift includes a lift cylinder that vertically expands and contracts with hydraulic oil and a fork claw that moves up and down by the lift cylinder.

Various hydraulic devices (such as a hydraulic pump and an electric motor) for operating the movable part are accommodated inside the vehicle body. In other words, the interior of the vehicle body is partitioned forward and backward in the traveling direction, and an oil tank and an oil control valve (hereinafter referred to as C / V) are housed in front of the vehicle body. Further, the rear of the inside of the vehicle body is divided into left and right along the vehicle width direction of the vehicle body, one side contains a hydraulic pump and an electric motor, and the other side is provided with a driving unit.
When the hydraulic pump is driven by the electric motor, the hydraulic oil in the oil tank is pressurized by the hydraulic pump and sent to the C / V. C / V can control the operation of the movable part by adjusting the flow rate of the pressure oil sent to the movable part such as a lift cylinder or by switching the flow direction. This C / V is connected to an operation lever provided in the driving section, and is operated by the driver.

JP 2001-335299 A (FIGS. 5 and 9)

  However, in the reach forklift described in Patent Document 1, since the electric motor and the hydraulic pump are stored in the side of the driving unit in the vehicle body, in order to secure a storage space for these electric motor and hydraulic pump, There is a problem that the space of the driving unit is restricted.

  An object of the present invention is to provide a work vehicle that can sufficiently secure a space for a driving unit without the driving unit being restricted in space by an electric motor for cargo handling and a hydraulic pump.

A work vehicle according to claim 1 of the present invention includes an electric motor for cargo handling, a hydraulic pump driven by the electric motor for cargo handling, a vehicle body that accommodates the hydraulic pump and the electric motor for cargo handling, and pressurization by the hydraulic pump. And a movable part that is actuated by the working fluid. The vehicle body is provided with a driving part on which the driver is boarded. The hydraulic vehicle controls the flow of the working fluid. control valve, and tank for storing the working fluid, Rutotomoni disposed forward of the driving unit in the running direction of the car body, are arranged side by side along the vehicle width direction orthogonal to the traveling direction, the electric motor for loading and unloading is , disposed on the opposite side of the driving unit in the vehicle width direction Rutotomoni, rotating shaft of the electric for the handling motor is arranged substantially parallel to the direction of travel, the control valve, is arranged adjacent to the tank Rutotomoni, characterized in that it is supported on the tank.

A work vehicle according to a second aspect of the present invention includes an electric motor for cargo handling, a hydraulic pump driven by the electric motor for cargo handling, a vehicle body that accommodates the hydraulic pump and the electric motor for cargo handling, and pressurization by the hydraulic pump. It is configured to include a movable portion, a operated by working fluid, the vehicle body, a work vehicle driving unit for the driver to passenger is provided, controlling the hydraulic pump, the flow of hydraulic fluid The control valve and the tank for storing the working fluid are disposed in front of the driving unit in the traveling direction of the vehicle body, and are disposed side by side along the vehicle width direction orthogonal to the traveling direction. , while being disposed on the opposite side of the driving unit in the vehicle width direction are arranged so that the rotation shaft of the electric for the cargo handling motor is substantially parallel to the direction of travel, the control valve and tank, in the vehicle width direction Characterized in that it is arranged on the operation unit side are.

A work vehicle according to a third aspect of the present invention includes an electric motor for cargo handling, a hydraulic pump driven by the electric motor for cargo handling, a vehicle body that accommodates the hydraulic pump and the electric motor for cargo handling, and pressurization by the hydraulic pump. It is configured to include a movable portion, a operated by working fluid, the vehicle body, a work vehicle driving unit for the driver to passenger is provided, controlling the hydraulic pump, the flow of hydraulic fluid control valve, and tank for storing the working fluid is disposed in front than the operating portion in the running direction of the car body, are arranged side by side along the vehicle width direction orthogonal to the traveling direction, the electric motor for cargo-handling The vehicle is disposed on the opposite side of the driving unit in the vehicle width direction, and is disposed so that the rotation shaft of the electric motor for cargo handling is substantially parallel to the traveling direction, and the control valve is disposed adjacent to the tank. Rutotomoni, is supported on the tank, the control valve and the tank is characterized in that it is arranged on the operating portion side in the vehicle width direction.

  In the above, according to the first aspect of the present invention, the hydraulic pump is disposed in front of the driving unit in the vehicle body, and the electric motor for cargo handling is disposed on the side of the driving unit in the vehicle body. It is not necessary to secure an accommodation space for the hydraulic pump in the vehicle body on the side of the vehicle body, and it is only necessary to secure an accommodation space for the electric motor for cargo handling. Therefore, the operation unit is not limited in space by the electric motor for cargo handling and the hydraulic pump, and the space of the operation unit can be sufficiently secured, and the object of the present invention can be achieved.

  According to the invention of claim 2, by arranging the electric motor for cargo handling so that the rotary shaft of the electric motor for cargo handling is substantially parallel along the traveling direction, the electric motor for cargo handling is arranged at the end of the rotary shaft of the electric motor for cargo handling. Even when the hydraulic pump is directly connected, the electric motor for cargo handling can be arranged on the side of the operating unit, and the hydraulic pump can be arranged in front of the operating unit. Therefore, a sufficient space for the operating part can be secured.

According to the third aspect of the present invention, the hydraulic pump and the control valve are arranged along the vehicle width direction of the vehicle body perpendicular to the traveling direction, so that the hydraulic pump and the control valve are made of piping material such as a hose. When connecting and forming the pipe line of a working fluid, the bent part of a pipe line can be decreased.
If the electric motor for cargo handling and the hydraulic pump are arranged on the side of the operating part as in the past, the pipe connecting the hydraulic pump and the control valve must form a large number of bent parts, There was a problem of increased pressure loss.
On the other hand, according to the present invention, since the bent portion of the pipe can be reduced, the pressure loss of the working liquid due to the pipe can be reduced, and the pipe can be simplified without being complicated. The pipe space can be reduced.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing an entire reach forklift 1 as a work vehicle according to the present embodiment. In FIG. 1, a reach forklift 1 is mounted in the front of a vehicle body 2 in which a traveling electric motor, an electric motor for cargo handling, a hydraulic pump driven by the electric motor for cargo handling, and the like are accommodated. The lift device 3 is driven by pressure oil from the hydraulic pump, and the head guard 4 extends upward from the vehicle body 2 and covers the head of the operator (driver).

  Of these, the vehicle body 2 is provided with a pair of left and right reach legs 5 extending forward, and along these reach legs 5, a lift device 3 is provided so as to be movable back and forth. Although not shown, drive wheels are provided at a substantially central position in the left-right direction (vehicle width direction) on the rear side of the vehicle body 2, and assist wheels 6 are provided on the left and right sides of the drive wheels. . The drive wheels are driven by a traveling electric motor. Such a vehicle body 2 is provided with a driving unit 7 in which an operator performs a driving operation in a standing posture.

  The lift device 3 includes a pair of masts 8 erected on the left and right sides, a lift bracket 9 that moves up and down along these masts 8, and a lift bracket 9 that is attached to the mast 8 and that drives the lift bracket 9 up and down via a chain. And a lift cylinder (not shown). The lift bracket 9 has a pair of left and right fork claws 10 extending forward. The lift device 3 is moved back and forth by a reach cylinder attached to the lower surface of the vehicle body 2 and the fork pawl 10 is tilted back and forth by a tilt cylinder on the lift bracket 9. .

  FIG. 2 is a perspective view showing the structure of the vehicle body 2. In FIG. 2, a steel vehicle body 2 includes a front and rear partition wall 21 that is a front wall that partitions the vehicle body 2 in the front-rear direction, and a front-rear partition wall 21 in the vehicle width direction of the vehicle body 2 (the left-right direction in FIG. 2). Left and right side walls 22 and 23 joined to both end portions of the vehicle body 2 and a rear wall 24 at the lower rear of the vehicle body 2. In addition, as shown by a two-dot chain line in FIG. 2, the top panel 16 is attached to the upper parts of the front and rear partition walls 21 and the side walls 22 and 23.

The back wall 24 connects the lower portions of the left and right side walls 22 and 23. A semicircular drive wheel cutout 241 for preventing interference with the drive wheel 15 is formed at a substantially central portion of the back wall 24 in the vehicle width direction.
In front of the front and rear partition walls 21, a horizontal upper and lower partition plate 25 that partitions the vehicle body 2 up and down is joined to the front and rear partition walls 21 and the left and right side walls 22 and 23. Further, at the lower part in front of the front and rear partition walls 21, the base end portions of the pair of reach legs 5 are fixed to the front and rear partition walls 21 and the left and right side walls 22 and 23.

  A pedestal 26 of a traveling electric motor (not shown) is formed between the front and rear partition walls 21 and the rear wall 24. The pedestal 26 not only supports the electric motor for traveling, but also connects the front and rear partition walls 21 and the rear wall 24, and is formed in a substantially rectangular shape from the front and rear partition walls 21, the side walls 22 and 23, and the rear wall 24. The frame structure at the bottom of the vehicle body 2 is reinforced.

A vertical arm 53 made of a vertically long plate-like steel material standing upward is fixed to the rear portion of the base 26 at the end on the side of the operating unit 7. A top panel 16 is fixed to the upper end of the vertical arm 53.
A detachable detachable cover 52 is attached between the vertical arm 53 and the front and rear partition walls 21. The detachable cover 52 is a partition plate that partitions the interior of the vehicle body 2 and the driving unit 7.

The operation unit 7 is defined by the front and rear partition walls 21, the side wall 22, and the detachable cover 52, and a floor member (not shown) is fixed below the operation unit 7. Between the rear part of the detachable cover 52 and the rear part of the side wall 22, an opening for an operator to get on the driving part 7 is formed.
A cover member 51 is provided above the back wall 24 to cover the space between the rear part of the side wall 23 and the rear part of the detachable cover 52. The cover member 51 is supported by the hinge member 511 so as to be openable and closable with respect to the side wall 23.

Hereinafter, the brackets 27 and 28 provided on the front and rear partition walls 21 and the side wall 23 in FIG. 2 will be described in detail.
In the upper part of the front and rear partition walls 21, a notch 211 that communicates the space before and after the front and rear partition walls 21 is formed. The first bracket 27 is joined horizontally to the notch 211. In addition, on the upper inner surface of the left side wall 23, the second bracket 28 is joined horizontally behind the front and rear partition walls 21. The first bracket 27 and the second bracket 28 support the electric motor 11 for cargo handling (in FIG. 3).

The first bracket 27 is formed in an elongated plate shape, and is joined to the front and rear partition walls 21 so that the longitudinal direction is along the vehicle width direction of the vehicle body 2 and the plate surface is horizontal. The first bracket 27 is formed with two bolt holes 271 for fixing the motor at two locations in the vehicle width direction of the vehicle body 2.
The second bracket 28 has a long and narrow plate shape and is formed with one end curved. The second bracket 28 is joined to the inner surface of the side wall 23 so that one curved end is behind the vehicle body 2 in the traveling direction and the plate surface is in the horizontal direction. In addition, a bolt hole 281 for fixing the motor is formed at one place on the curved end of the second bracket 28. These brackets 27 and 28 are disposed at substantially the same height of the vehicle body 2 so that their longitudinal directions are orthogonal to each other.

3 to 5 are a plan view showing positions of the cargo handling electric motor 11 and the hydraulic pump 12 housed in the vehicle body 2, a perspective view seen from the front, and a perspective view seen from the rear. FIG. 6 is a perspective view showing a connection structure between the first and second mounting brackets 31 and 32 and the vehicle body 2.
In FIG. 3, the cargo handling electric motor 11 is arranged behind the front and rear partition walls 21 of the vehicle body 2 so that the rotating shaft of the motor 11 is along the traveling direction. A hydraulic pump 12 is directly connected to the end of the rotating shaft of the cargo handling electric motor 11. The hydraulic pump 12 is disposed in front of the front and rear partition walls 21 and has connection ports 121 and 122 (FIG. 4) provided at the top and bottom. The suction-side connection port 121 of the hydraulic pump 12 is provided downward, and the discharge-side connection port 122 is provided upward.

Above the upper and lower partition plates 25, an oil control valve (C / V) 13 that is a control valve of the present invention is disposed at a substantially central position in the vehicle width direction of the vehicle body 2. The C / V 13 is connected to the base end of an operation lever 17 that is exposed above a top panel (not shown). The operation lever 17 is mechanically connected to a spool (not shown) built in the C / V 13 so that the spool can be moved. In other words, when the operation lever 17 is operated, the spool of the CV 13 is moved to change the flow rate of the pressure oil, or the direction of the pressure oil flow is switched to control the flow of the pressure oil. It has become.
An oil tank 14 for storing hydraulic oil is fixed on the upper and lower partition plates 25 adjacent to the C / V 13 at a position in front of the operating unit 7. The oil tank 14 supports the adjacent C / V 13 with a support fitting or the like. As described above, the hydraulic pump 12, the C / V 13, and the oil tank 14 are arranged along a substantially straight line along the vehicle width direction of the vehicle body 2.

Hereinafter, the mounting structure of the electric motor 11 for cargo handling will be described in detail.
As shown in FIGS. 3 to 5, a first mounting bracket 31, a second mounting bracket 31, and a second mounting bracket 31 are provided at the end of the hydraulic pump 12 side and the end of the hydraulic pump 12, respectively, along the rotating shaft of the cargo handling electric motor 11. The mounting bracket 32 is fixed.
As shown also in FIG. 6, the first mounting bracket 31 has a plate-like main body 311 disposed below the hydraulic pump 12 and flange portions 312 formed at both ends of the main body 311. Configured. The main body 311 is formed longer than the dimension of the hydraulic pump 12 in the width direction, and is fixed to the end of the electric motor 11 for cargo handling on the hydraulic pump 12 side with a bolt (not shown).

The flange portion 312 is formed with a notch 313 into which a bolt can be inserted. Alternatively, a bolt hole may be formed in the flange portion 312 so as to be coaxial with the bolt hole 271 of the first bracket 27 instead of the notch portion 313.
The electric motor 11 for cargo handling is arranged so that the flange portion 312 of the first mounting bracket 31 fixed to the motor 11 is parallel to the first bracket 27, and between the flange portion 312 and the first bracket 27. With the rubber mount 33 interposed therebetween, the first bracket 27 is bolted. The rubber mount 33 is formed in a substantially cylindrical shape and has a through hole 331. The bolt is inserted through the notch 313 of the flange portion 312, the through hole 331 of the rubber mount 33, and the bolt hole 271 of the first bracket 27. In this manner, the cargo handling electric motor 11 is fastened and fixed to the first bracket 27 at two locations sandwiching the hydraulic pump 12 along the vehicle width direction of the vehicle body 2 by the first mounting bracket 31.

As shown in FIGS. 3 and 5, the second mounting bracket 32 is a long member having an L-shaped cross section, and is fixed to an end portion of the cargo handling electric motor 11 opposite to the hydraulic pump 12. The second mounting bracket 32 is formed with a bolt hole coaxial with the bolt hole 281 of the second bracket 28, and the second mounting bracket 32 and the second bracket 28 are bolted via a substantially cylindrical rubber mount 34. Is done.
Thus, the electric motor 11 for cargo handling is fixed to the first bracket 27 at two locations via the first mounting bracket 31, and is fixed to the second bracket 28 at one location via the second mounting bracket 32. ing.

Next, as shown in FIG. 4, hydraulic hoses 41 to 44 that connect the hydraulic pump 12 and hydraulic equipment such as the C / V 13 will be described.
The other end of the hydraulic hose 41 whose one end is connected to the oil tank 14 is connected to the connection port 121 on the suction side of the hydraulic pump 12. One end of a hydraulic hose 42 having a smaller diameter than the hydraulic hose 41 is connected to the connection port 122 on the discharge side of the hydraulic pump 12, and one end of the hydraulic hose 42 is connected to the C / V 13. The hydraulic hose 42 constitutes a pipe line that connects the hydraulic pump 12 and the C / V 13. The other end of a plurality of hydraulic hoses 43 having one end connected to a movable part such as a lift cylinder is connected to C / V 13. Further, a hydraulic hose 44 for returning the working oil to the oil tank 14 is also connected to the C / V 13.

Hereinafter, the operation system configuration of the reach forklift 1 will be briefly described by taking the operation of the lift cylinder as an example.
The hydraulic pump 12 is driven by the cargo handling electric motor 11, and sucks hydraulic oil in the oil tank 14 from the suction-side connection port 121 via the hydraulic hose 41 and from the discharge-side connection port 122 to the C via the hydraulic hose 42. / V13.
When the driver moves the operation lever 17, the spool in the C / V 13 moves, the flow rate of the pressure oil from the C / V 13 to the lift cylinder or the like changes, or the direction of the flow of the pressure oil changes, The operation of the lift cylinder or the like can be controlled.
In this way, the lift cylinder and the like are expanded and contracted by the hydraulic pressure from the hydraulic pump 12 and the fork pawl 10 is operated to perform the cargo handling operation.
Other cylinders such as a reach cylinder and a tilt cylinder are configured to operate in the same manner as the lift cylinder.

  Therefore, according to the present embodiment, the hydraulic pump 12 is disposed in front of the driving unit 7 in the vehicle body 2 and the cargo handling electric motor 11 is disposed on the side of the driving unit 7 in the vehicle body 2. It is not necessary to secure a storage space for the hydraulic pump 12 in the vehicle body 2 on the side of the driving unit 7, and it is sufficient that only a storage space for the electric motor 11 for cargo handling can be secured. Therefore, the space for the operation unit 7 can be sufficiently secured without the operation unit 7 being restricted by the space by the cargo handling electric motor 11 and the hydraulic pump 12.

  Moreover, according to this embodiment, since the electric motor 11 for cargo handling is arrange | positioned so that the rotating shaft of the said motor 11 may follow a running direction, the hydraulic pump 12 is connected to the edge part of the rotating shaft of the electric motor 11 for cargo handling. In this case, only the cargo handling electric motor 11 can be arranged on the side of the operation unit 7, and the hydraulic pump 12 can be arranged in front of the operation unit 7. Therefore, a sufficient space for the operation unit 7 can be secured.

  Moreover, according to this embodiment, since C / V13 is arrange | positioned on the straight line along the direction orthogonal to the rotating shaft of the electric motor 11 for cargo handling with respect to the hydraulic pump 12, hydraulic pump 12 and C / V13 are arranged. When connecting with the hydraulic hose 42, the bent portion of the hydraulic hose 42 can be reduced. Therefore, the hydraulic oil pressure loss due to the bent portion of the hydraulic hose 42 can be reduced.

It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
For example, in the reach forklift 1 of the above embodiment, the vehicle body 2 is provided with the cover member 51 that can be opened and closed. However, the present invention is not limited to this, and the rear wall may be extended upward instead of the cover member. Good. In this case, the second bracket may be fixed to the back wall.

  In the above embodiment, the vehicle body is formed by connecting the front and rear partition walls 21, the side walls 22, 23, and the rear wall 24, which are front walls, but is not limited thereto, and the front wall constituting the vehicle body is not limited thereto. , At least two of the side wall and the back wall may be integrally formed.

  The reach forklift 1 of the above embodiment is a reach type that includes a lift device that can move the fork claw back and forth. However, the present invention is not limited to this, and the present invention may be applied to a counter type forklift. Furthermore, the present invention is not limited to a forklift, and may be applied to a work vehicle including a cargo handling device that is operated by a working fluid.

  The present invention can be used not only for forklifts but also for work vehicles such as small hydraulic excavators and wheel loaders.

1 is a perspective view showing an entire work vehicle according to an embodiment of the present invention. The perspective view which shows the structure of the vehicle body of a working vehicle. The top view which shows arrangement | positioning of the electric motor for cargo handling of a work vehicle, and a hydraulic pump. The perspective view seen from the front which shows the inside of the body of a work vehicle. The perspective view seen from the back which shows the inside of the body of a work vehicle. The perspective view explaining in detail the attachment structure of the electric motor for cargo handling of a work vehicle.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Forklift which is a working vehicle, 2 ... Body body, 3 ... Lift apparatus which is a movable part, 7 ... Driving | running part, 11 ... Electric motor for cargo handling, 12 ... Hydraulic pump, 13 ... Oil control valve which is a control valve (C / V), 42... Hydraulic hose that is a pipeline.

Claims (3)

An electric motor for cargo handling, a hydraulic pump driven by the electric motor for cargo handling, a vehicle body that houses the hydraulic pump and the electric motor for cargo handling, and a movable portion that is operated by a working fluid pressurized by the hydraulic pump; The vehicle body is a work vehicle provided with a driving unit on which a driver rides,
Said hydraulic pump, control valve for controlling the flow of the working fluid, and a tank for storing the working fluid, the than the operating portion in the running direction of the vehicle body is disposed in front Rutotomoni, perpendicular to the traveling direction Arranged along the vehicle width direction ,
The electric motor for loading and unloading is disposed on the opposite side of the operating portion in the vehicle width direction Rutotomoni, it is arranged so that the rotation shaft of the electric motor for the handling is substantially parallel to said traveling direction,
The control vehicle is disposed adjacent to the tank and is supported by the tank . An electric motor for cargo handling, a hydraulic pump driven by the electric motor for cargo handling, a vehicle body that houses the hydraulic pump and the electric motor for cargo handling, and a movable portion that is operated by a working fluid pressurized by the hydraulic pump; is configured to include a said vehicle body is the work vehicle driving unit for the driver to passenger is provided,
The hydraulic pump, a control valve that controls the flow of the working fluid, and a tank that stores the working fluid are disposed in front of the operating unit in the traveling direction of the vehicle body, and are orthogonal to the traveling direction. Arranged along the vehicle width direction,
The electric motor for cargo handling is arranged on the opposite side of the driving unit in the vehicle width direction, and is arranged so that the rotation shaft of the electric motor for cargo handling is substantially parallel to the traveling direction ,
The work vehicle, wherein the control valve and the tank are disposed on the driving unit side in the vehicle width direction . An electric motor for cargo handling, a hydraulic pump driven by the electric motor for cargo handling, a vehicle body that houses the hydraulic pump and the electric motor for cargo handling, and a movable portion that is operated by a working fluid pressurized by the hydraulic pump; is configured to include a said vehicle body is the work vehicle driving unit for the driver to passenger is provided,
The hydraulic pump , a control valve that controls the flow of the working fluid , and a tank that stores the working fluid are disposed in front of the operating unit in the traveling direction of the vehicle body, and are orthogonal to the traveling direction. are arranged along the vehicle width direction,
The electric motor for cargo handling is arranged on the opposite side of the driving unit in the vehicle width direction, and is arranged so that the rotation shaft of the electric motor for cargo handling is substantially parallel to the traveling direction,
The control valve is disposed adjacent to the tank and supported by the tank,
The work vehicle, wherein the control valve and the tank are disposed on the driving unit side in the vehicle width direction .

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