JP2003073092A - Reach forklift - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reach forklift capable of expanding a driver's seat and shortening a high-pressure hose to be a feed pipe of operating oil. SOLUTION: This reach forklift is provided with a pair of straddle arms extended frontward in the lower part of a vehicle body 2, a mast carriage 4 reciprocatingly mounted on the straddle arms, and a hydraulic device 31 for cargo handling work. This reach forklift is characterized in that the hydraulic device is mounted in a space part in the lower part of the mast carriage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reach type forklift having a hydraulic device for cargo handling work.

[0002]

2. Description of the Related Art Conventionally, as a reach type forklift,
The structure shown in FIGS. 8 to 11 is known. A reach-type forklift denoted by reference numeral 1 in these drawings is a vehicle body frame 2 that constitutes a vehicle body, a pair of left and right straddle arms 3 that extend forward from a lower portion of the vehicle body frame 2, and between these straddle arms 3. , A mast carriage 4 mounted so as to be movable in the front-back direction of the vehicle.
And a pair of left and right masts 5 standing upright on the front of the mast carriage 4, and a fork 6 mounted between the masts 5 so as to be movable up and down.

On the mast carriage 4, a pair of lift cylinders 7 which are hydraulically actuated to move the forks 6 up and down are provided at a position closer to the inside of the mast 5 in total. Below the vehicle body frame 2, a reach cylinder 8 that is installed between the rear end portion of the vehicle body frame 2 and the mast carriage 4 and that performs reach-in / reach-out of the mast carriage 4 and that is operated by hydraulic pressure is provided. It is provided.
Further, as shown in FIG. 11, the fork 6 that moves up and down along the mast 5 is configured so that the lift bracket 43 and the fork 6 are supported by the shaft 42 on the slide bracket 41 that slides up and down with respect to the mast 5. The tilt cylinder 40 provided on the slide bracket 41 tilts the fork 6 in the front-rear direction with respect to the mast.

A hydraulic device 9 for supplying hydraulic oil to the lift cylinder 7, the reach cylinder 8, the tilt cylinder 40 and the like is provided on the vehicle body frame 2 and covers the hydraulic device 9. Is provided with a side cover 10, and a top cover 11 is provided so as to cover the side cover 10 from above.

The hydraulic device 9 includes an oil tank 12 for storing hydraulic oil, an oil pump 13 for sucking and pressurizing the hydraulic oil from the oil tank 12, and a motor (electric motor) for driving the oil pump 13. ) 14 and a control valve 15 that controls the supply of the hydraulic oil.

The oil tank 12 is installed on the left side portion of the vehicle body frame 2, the oil pump 13 and the motor 14 are integrated with each other, and the oil tank 12 is disposed substantially in the center portion of the vehicle body frame 2. The control valve 15 is arranged above the front portion of the vehicle body frame 2.

Further, the right side portion of the motor 14 of the vehicle body frame 2 serves as a driver's seat 16, and a steering handle 17 for steering the vehicle is provided above the top cover 11 and on the left side of the driver's seat 16. Provided, also
In front of the driver's seat 16 of the top cover 11,
Various operation levers 18 for operating the control valve 15 are provided.

On the other hand, high pressure hoses 19 and 20 for supplying and recovering the working oil are provided between the control valve 15 and the lift cylinder 7 and the reach cylinder 8, and the control valve 15 and the tilt cylinder 40 are provided. A high pressure hose (not shown) is also provided between and.

[0009]

In the conventional reach type forklift 1 as described above, as described above, the oil tank 12, the oil pump 12, and the electric motor 14 which constitute the hydraulic device 9 are provided. However, since it is installed on the side of the driver's seat 16, the driver's seat 16 cannot be wide.

Further, in particular, since the lift cylinder 7 is moved to the front of the vehicle together with the reach out of the fork 6, the length of the high pressure hose 19 and the like connected to the lift cylinder 7 is set to the lift. The length of the cylinder 7 must be set in consideration of the amount of movement, which causes a problem of increased piping cost.

The present invention has been made in view of the above-mentioned conventional problems, and by improving the layout of the hydraulic system, the driver's seat can be enlarged and the hydraulic oil supply pipe can be provided. An object of the present invention is to provide a reach type forklift capable of shortening the high pressure hose.
At the same time, it aims to solve various problems that may be expected in achieving such an objective.

[0012]

In order to achieve the above-mentioned object, a reach type forklift according to a first aspect of the present invention is provided with a pair of straddle arms extending forward of a lower portion of a vehicle body and the straddle arms. A mast carriage mounted on an arm so that it can move forward and backward, a fork that moves up and down along a pair of masts that are erected on the mast carriage, a hydraulic cylinder that lifts or tilts the fork by hydraulic pressure, and a hydraulic cylinder. A reach-type forklift having a hydraulic device that supplies hydraulic oil, wherein the hydraulic device is disposed in the mast carriage.

According to the reach type forklift according to the first aspect, since the hydraulic device is arranged in the mast carriage, the oil tank 12 and the oil pump 1 are provided on the vehicle body side.
2, the electric motor 1 and the like are not installed, and the driver's seat 16
And the hose connecting the vehicle body side and the mast carriage side is eliminated.

In a reach type forklift according to a second aspect of the present invention, the hydraulic device according to the first aspect includes an oil tank in which hydraulic oil is stored, and the hydraulic oil is sucked and pressurized from the oil tank. An oil pump, a motor for driving the oil pump, and a control valve for controlling the supply of the hydraulic oil are provided, and at least a part of them is arranged between the masts.

According to the reach type forklift according to the second aspect, at least a part of the hydraulic device is provided so as to extend to the space between the masts, so that the internal space of the mast carriage can be utilized without waste. This has the effect of facilitating the layout of the hydraulic system.

In the reach type forklift according to claim 3 of the present invention, two hydraulic cylinders for raising and lowering the fork by hydraulic pressure according to claim 2 are provided inside each of the masts. At least a part is arranged between the hydraulic cylinders.

According to the reach type forklift of the third aspect, when two cylinders for raising and lowering a fork are provided inside each of the masts, the hydraulic device is discharged between the cylinders to discharge the fork. This has the effect of further simplifying the layout of the hydraulic device.

In a reach type forklift according to a fourth aspect of the present invention, the hydraulic device according to the first to third aspects includes an oil tank in which hydraulic oil is stored, and the hydraulic oil is sucked from the oil tank. An oil pump for pressurizing, a motor for driving the oil pump, and a control valve for controlling the supply of the hydraulic oil are provided, at least a part of which is disposed in the mast carriage via a cushioning material having elasticity. It is characterized by being.

According to the reach type forklift according to the fourth aspect, at least a part of the hydraulic device is disposed in the mast carriage via the buffer material having elasticity, so that the reach-in and reach-out of the mast are performed. This is effective in preventing the hydraulic system from being damaged by the impact caused by. The cushioning material may be rubber, sponge, etc.
Alternatively, a spring can be used.

In the reach type forklift according to claim 5 of the present invention, the hydraulic device according to any one of claims 1 to 4 is provided with an oil tank in which hydraulic oil is stored, and the hydraulic oil is sucked from the oil tank. An oil pump for pressurizing, a motor for driving the oil pump, and a control valve for controlling the supply of the hydraulic oil are provided, and at least a part of them is arranged in a state that can be opened and closed. It is characterized by

According to the reach type forklift according to the present invention, since at least a part of the hydraulic device is arranged in a case, the hydraulic device is directly exposed to dust around the vehicle. Therefore, the possibility of failure due to contamination can be reduced. Further, since the case can be opened and closed, there is an effect that maintenance can be easily performed.

A reach-type forklift according to a sixth aspect of the present invention is characterized in that the motor according to the second to fifth aspects is arranged in the mast carriage with its rotation axis being horizontal. And

According to the reach type forklift according to the sixth aspect, since the motor is arranged in the mast carriage with its rotating shaft being horizontal, the height of the motor can be kept low. Therefore, when the mast carriage enters the lower side of the vehicle body at the time of reach-in, the problem that the motor abuts and interferes with the vehicle body can be solved.

In the reach type forklift according to claim 7 of the present invention, the operating lever for controlling and operating the control valve according to any one of claims 2 to 6 is arranged in the driver's seat of the vehicle body, and Electrical wiring for connecting the control valve is arranged in the straddle arm.

According to the reach type forklift according to the seventh aspect, the electric wiring for connecting the operation lever and the control valve is housed in the straddle arm, so that the appearance of the forklift as a whole can be improved.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIGS. Note that, in the following description, the main constituent members of the reach type forklift are common to those in FIGS. 8 to 11, and therefore, the same reference numerals are used for these main constituent members to simplify the description.

In FIG. 1, reference numeral 30 denotes a reach type forklift according to the present embodiment, which includes a pair of straddle arms 3 extending in front of a lower portion of a vehicle body frame 2 which constitutes a vehicle body, and these straddle arms 3. A mast carriage 4 mounted between the arms 3 so as to be able to move forward and backward,
A hydraulic device 31 for cargo handling work is provided.
However, it has a basic structure mounted in the lower space of the mast carriage 4.

Next, in detail, in the present embodiment, the hydraulic device 31 sucks and pressurizes the hydraulic oil from the oil tank 32 in which the hydraulic oil is stored and the oil tank 32. Oil pump 3
3, a motor (electric motor) 34 that drives the oil pump 33, and a control valve 35 that controls the supply of the hydraulic oil.

As shown in FIG. 2, the oil tank 32, the oil pump 33, and the motor 34, in particular, the motor 34 has its rotation axis set horizontally so that the height of the mast carriage 4 is increased. Is installed low and is housed in the space formed by the mast carriage 4.

Further, in the present embodiment, the control valve 35 is installed so as to extend from the space portion of the mast carriage 4 between the mast 5 and the lift cylinder 7.

On the other hand, as the control valve 35, an electromagnetic valve is used in the present embodiment, and the control unit 36 for controlling the drive of the control valve 35, as shown in FIG. The control unit 36 and the control valve 35 are installed on the signal line 37.
Connected by.

As shown in FIG. 4, the reach cylinder 8 has its body 8a side fixed to the mast carriage 4 and its rod 8b side fixed to the vehicle body frame 2.

Then, between the oil tank 32 and the oil pump 33, between the oil pump 33 and the control valve 3
5, the control valve 35 and the lift cylinder 7
As shown in FIG. 4, the high pressure hose 38 is connected between the high pressure hose 38 and the reach cylinder 8. The tilt cylinder 40 shown in FIG. 11 is similar to the lift cylinder 7 and the reach cylinder 8, and is connected to the control valve 35 by a high pressure hose (not shown).

In the reach-type forklift 30 according to the present embodiment having the above-described structure, the mast carriage 4 is moved to the reach-in position as shown in FIG.
The oil tank 32, the oil pump 33, and the motor 34 arranged in the lower space of the mast carriage 4 are drawn into the inside of the body frame 2 by being drawn inside the lower portion of the body frame 2. Be done. Here, the control valve 35 is located between the both masts 5, but since the control valve 35 is installed so as not to project in the front-rear direction of the vehicle with respect to the masts 5, the mast 5 is mounted on the vehicle body. It is pulled up to the close range of the frame 2.

Accordingly, the main part of the hydraulic device 31 is housed inside the vehicle body frame 2 and below the driver's seat 16. As a result, the hydraulic device 31 is installed on the side of the driver's seat 16. Since the number of constituent members required can be reduced, the width of the driver's seat 16 can be correspondingly increased as shown in FIG.

On the other hand, the hydraulic system 31 works together with the lift cylinder 7 and the reach cylinder 8 together with the mast carriage 4.
By being mounted on the mast carriage 4, the relative positions thereof are fixed, and accordingly, the hydraulic device 31, the lift cylinder 7 and the reach cylinder 8 are accompanied.
The length of the high-pressure hose 38 that connects to and can be set to a fixed length, and the length can be set to the shortest length. Therefore, the piping work can be simplified and the piping cost can be reduced.

Further, a signal line 37 for electrically connecting the control unit 36 and the control valve 35 is provided between the control unit 36 and the control valve 35, and the signal line 37 is used for the above-described reach-in / reach-out control unit. It is necessary to set the length to allow relative movement between the control valve 36 and the control valve 35. However, since the signal line 37 has sufficient flexibility, its wiring is easy and the high voltage is high. Hose 38
Since it is cheaper than the above, there is no cost problem even if the signal line 37 is long. Although not shown, by arranging the signal line 37 in the straddle arm, the signal line 37 cannot be easily visually recognized from the outside of the vehicle body, and the appearance can be improved.

Further, since the hydraulic device 31, which is a heavy object, is housed in the mast carriage 4 at a low position, the reach-type forklift 30 has a low center of gravity,
As a result, the stability can be improved.

On the other hand, the hydraulic device 31 is located in front of the side cover 10 as shown in FIG. 5 in the state where the mast carriage 4 is moved to the reach-out position, and the side cover 10 and The upper part of the mast 5 is opened.

Therefore, when the hydraulic device 31 is inspected or the hydraulic oil is replenished, the hydraulic device 31 can be easily exposed and the work is performed at a low position. Can be simple.

As shown in FIG. 12, the hydraulic device 31
Of the oil pump 33, the motor 34, the control valve 35, and the like are housed in a box-shaped case 45.
The case 45 is covered with a lid 46, and the case 26 is screwed 47.
Alternatively, the case 45 may be hermetically fixed. By doing so, it is possible to prevent dust around the vehicle from easily adhering to the control valve 35 or the like, and reduce the possibility of failure thereof. The upper surface of the case 45 can be easily opened and closed by attaching and detaching the screw 47.
Maintenance of the control valve 35 and the like can be easily performed.

Further, as shown in FIG. 12, a cushioning material 48 having elasticity such as rubber or sponge is interposed between the case 45 and the mast carriage 4, so that the control valves 35 and the like are reach-in / reach. It is possible to effectively protect from the shock caused by out and reduce its failure and damage. The cushioning member 48 may be a spring or the like, may be provided between the control valve 35 or the like and the case 45, or may be directly interposed between the control valve 35 or the like and the mast carriage 4. Is also good.

The shapes, sizes, etc. of the respective constituent members shown in the above embodiment are examples, and can be variously changed based on design requirements and the like. For example, the hydraulic device 31
The oil tank 32, the oil pump 33, the motor 34, the control valve 35, etc. constituting the above are unitized into one unit, and the unitized hydraulic device 31 is mounted in the mast carriage 4. Good.

Further, as shown in FIG. 7, the mounting positions of the control valve 35 and the oil tank 32 can be exchanged.

[0045]

As described above, according to the first aspect of the present invention.
According to the reach type forklift described in (1), the hydraulic device is stored below the mast carriage, and
The width of the driver's seat can be correspondingly increased by reducing the number of constituent members installed on the side of the driver's seat. Further, since the hydraulic device, which is a heavy load, is housed in the mast carriage at a low position of the vehicle, the reach-type forklift truck can have a low center of gravity and its stability can be improved.

Further, according to the reach type forklift according to the second aspect, at least a part of the hydraulic device is provided so as to extend to the space between the masts, so that the internal space of the mast carriage can be utilized without waste. This has the effect of facilitating the layout of the hydraulic system.

According to the reach type forklift of the third aspect, when two cylinders for raising and lowering a fork are provided inside each of the masts, the hydraulic device is discharged between the cylinders to remove the fork. This has the effect of further simplifying the layout of the hydraulic device.

Further, according to the reach type forklift according to the fourth aspect, since at least a part of the hydraulic device is arranged in the mast carriage through the cushioning material having elasticity, the reach-in and reach-out of the mast are performed. This is effective in preventing the hydraulic system from being damaged by the impact caused by. The cushioning material may be rubber, sponge, etc.
Alternatively, a spring can be used.

According to the reach type forklift according to the present invention, since at least a part of the hydraulic device is accommodated in the case, the hydraulic device is directly exposed to dust around the vehicle. Therefore, the possibility of failure due to contamination can be reduced. Further, since the case can be opened and closed, there is an effect that maintenance can be easily performed.

Further, according to the reach type forklift according to the sixth aspect, since the motor is arranged in the mast carriage with the rotation axis thereof being horizontal, the height of the motor is kept low. Therefore, when the mast carriage enters the lower side of the vehicle body at the time of reach-in, the problem that the motor abuts and interferes with the vehicle body can be solved.

Further, according to the reach type forklift according to the seventh aspect, since the electric wiring for connecting the operation lever and the control valve is housed in the straddle arm, the appearance of the forklift as a whole can be improved.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 shows an embodiment of the present invention, and is a view of the main part as seen from the rear of the vehicle.

FIG. 3 is a perspective view of a main part showing an embodiment of the present invention.

FIG. 4 is a plan view of a main part showing an embodiment of the present invention.

FIG. 5 is a side view for explaining the operation according to the embodiment of the present invention.

FIG. 6 shows an embodiment of the present invention and is a view of the vehicle as viewed from the rear.

FIG. 7 is a perspective view of a main part showing another embodiment of the present invention.

FIG. 8 shows a conventional example, and is a view of the vehicle as viewed from the rear.

FIG. 9 is a plan view showing a conventional example with a part omitted.

FIG. 10 is a side view showing a conventional example.

FIG. 11 is a perspective view showing a configuration around a fork used in both the conventional example and the embodiment of the present invention.

FIG. 12 is a sectional view of a mast carriage according to another embodiment of the present invention.

[Explanation of symbols]

1 Reach type forklift 2 Body frame (vehicle body) 3 straddle arms 4 mast carriage 5 masts 6 forks 7 Lift cylinder 8 reach cylinder 9 Hydraulic system 10 Side cover 11 top cover 12 oil tank 13 Oil pump 14 Electric motor 15 Control valve 16 Driver's seat 17 Steering handle 18 Operation lever 19 High pressure hose 20 high pressure hose 30 Reach type forklift 31 Hydraulic system 32 oil tank 33 Oil pump 34 motor 35 Control valve 36 control unit 37 signal line 38 High pressure hose

Claims (7)

[Claims] 1. A pair of straddle arms extending forward from the lower part of the vehicle body, a mast carriage attached to the straddle arm so as to be able to move forward and backward, and a pair of masts provided upright on the mast carriage. A reach-type forklift having a fork that moves up and down, a hydraulic cylinder that lifts or tilts the fork hydraulically, and a hydraulic device that supplies hydraulic oil to the hydraulic cylinder, wherein the hydraulic device is provided in the mast carriage. A reach-type forklift that is provided. 2. The hydraulic system comprises: an oil tank in which hydraulic oil is stored; an oil pump that sucks and pressurizes the hydraulic oil from the oil tank; a motor that drives the oil pump; The reach-type forklift according to claim 1, further comprising a control valve that controls supply, at least a part of which is disposed between the masts. 3. A hydraulic cylinder for vertically moving the fork is provided inside each of the masts, and at least a part of the hydraulic device is arranged between the hydraulic cylinders. The reach-type forklift according to claim 2. 4. An oil tank in which hydraulic oil is stored, an oil pump that sucks and pressurizes the hydraulic oil from the oil tank, a motor that drives the oil pump, and The reach type forklift according to any one of claims 1 to 3, further comprising a control valve for performing supply control, at least a part of which is disposed in the mast carriage via an elastic cushioning material. . 5. The hydraulic system comprises: an oil tank in which hydraulic oil is stored; an oil pump that sucks and pressurizes the hydraulic oil from the oil tank; a motor that drives the oil pump; The reach-type forklift according to any one of claims 1 to 4, further comprising a control valve for performing supply control, at least a part of which is disposed in a state in which the case can be opened and closed. 6. The reach type forklift according to any one of claims 2 to 5, wherein the motor is arranged in the mast carriage with its rotation axis being horizontal. 7. An operation lever for controlling and operating the control valve is provided in a driver's seat of a vehicle body, and an electric wire connecting the lever and the control valve is provided in the straddle arm. The reach type forklift according to any one of claims 2 to 6.