JP2000351595A - Side fork type carrying vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a side fork type carrying vehicle enabling various kinds of running modes such as a laterally running, turning on the spot and a parallel movement. SOLUTION: A pair of right/left drive wheels 2 provided on a car body 1 are interlocked and connected to the drive shaft of a hydraulic motor 30 side respectively. Both hydraulic motors 30 are installed on the turning member 33 provided turnably around the vertical axis center 36 against the car body 1 side respectively and provide a turning means 40 for turning the turning member 33. A hydraulic pump driven by an engine 4 is provided in the car body 1 side and also the hydraulic motor 30 is connected to this hydraulic pump. A steering wheel 3 is provided turnably around the vertical axis center 59 against the car body 1 side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a side fork type transfer vehicle used for transferring heavy objects, for example.

[0002]

2. Description of the Related Art Conventionally, as this type of side fork-type transfer vehicle, for example, the structure shown in FIGS. 4, 12 to 15 is provided. That is, the vehicle body 1 can travel on the floor via the drive wheel (rear wheel) 2 and the turning wheel (front wheel) 3, and at this time, the vehicle is driven by the driving force of the engine 4 mounted on the vehicle body 1. This is performed by forcibly rotating the drive wheel 2.

The vehicle body 1 is provided with a pair of front and rear guide rails 5 in the front and rear direction. A movable body 6 is provided between the guide rails 5, and a pair of front and rear masts 7 is provided from an end of the movable body 6. Is erected. A pair of left and right guide rollers 8 are provided before and after the movable body 6 and the mast 7, respectively. The guide rollers 8 are fitted to and guided by the guide rails 5, so that the movable body 6 and the mast 7 It is configured to be able to reciprocate in the left-right direction. An elevating body 9 guided by both masts 7 is provided, and the elevating body 9 is provided with a fork 10 facing in the left-right direction. The elevating body 9 is moved up and down by a lift cylinder 11.

[0006] Reach means 13 for protruding the fork 10 in the left-right direction is provided. The reach means 13 includes a pair of support rods 14 erected from the vehicle body 1 side,
A support pin 15 provided between the upper ends of the support rods 14 in the front-rear direction, an operating cylinder 17 having a main body connected to the support pin 15 and a piston rod connected to the mast 7 via a connection pin 16, etc. It consists of. An operating section 20 is provided at the front of the vehicle body 1 and on one side, and the operating section 20 is equipped with a driver's seat 21, an operating handle 22, a group of operating levers 23, and the like.

[0005] According to such a conventional configuration, as shown by the phantom line in FIG.
By extending the movable member 7, the movable body 6 and the mast 7 can be laterally moved via the guide roller 8, so that the fork 10 can be protruded in the lateral direction. Further, as shown by the solid line in FIG. 14, by contracting the working cylinder 17, the movable body 6 and the mast 7 can be laterally moved in the opposite direction via the guide roller 8, and the fork 10 can be moved in and out. .

[0006] By appropriately incorporating the elevating movement of the elevating body 9 by the lift cylinder 11, that is, the elevating movement of the fork 10, it is possible to load and unload the intended goods.
It should be noted that the above-described operations, transportation and the like are performed by the driver on the driving unit 20 by the operation handle 22 or the operation lever 23.
It is performed by manipulating a group or the like.

[0007]

According to the above-described conventional side fork-type transfer vehicle, various running modes such as traversing, turning in place, and parallel movement are impossible. This is partly (possible) in the battery format, but mainly in the conventional engine format described above,
The driving force is mechanically connected by manual, torque transmission, differential, etc., and it is difficult to turn the drive wheels. Specifically, the direction of the drive wheels 2 is fixed, and the number of the turning wheels 3 is one. The cause is that the turning control is performed on a wheel-by-wheel basis.

That is, as shown in FIG. 13, the turning wheel 3 is turned in response to the operation of the operating handle 22, so that
While turning, the turning center O is on the extension of the drive shaft (fixed axis) at that time, so that turning on the spot is impossible. And the turning radius R also increases. Further, as shown in FIG. 12A, when the vehicle is turned and laid sideways on the shelf device 25, it cannot be sufficiently brought close to the front surface of the shelf device 25. In addition, troublesome switching S is required,
Even if this switching S is performed, it is not possible to perform a sufficient width adjustment. As a result, the vehicle moves away from the load in the shelf device 25, and the center of load approaches the tip of the fork 10, and the vehicle tends to fall.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a side fork type transport vehicle capable of performing various traveling modes such as traversing, turning in place, and parallel movement.

[0010]

According to a first aspect of the present invention, there is provided a side fork-type transfer vehicle, wherein a pair of left and right drive wheels provided on a vehicle body are respectively provided with a hydraulic motor. The two hydraulic motors are attached to a turning member that is rotatably provided around a vertical axis with respect to the vehicle body side, and the two motors are turned to rotate the turning member. Means are provided, a hydraulic pump driven by an engine is provided on the vehicle body side, and the hydraulic motor is connected to this hydraulic pump,
The diverting wheel is provided so as to be rotatable around the longitudinal axis with respect to the vehicle body side.

Therefore, according to the first aspect of the present invention, when the vehicle is traveling straight in normal traveling in which the pair of left and right drive wheels and the diverting wheels face in the front-rear direction, the difference between the rotation speeds of the two drive wheels causes the transfer vehicle to move left and right. Can turn. Further, when the in-situ turning mode is selected, the rotating means can operate by a predetermined amount to turn the left and right driving wheels in a C-shape, and the hydraulic pressure from the hydraulic pump driven by the engine is applied to the hydraulic motor. By supplying and driving the drive wheels in the forward and reverse directions, the transport vehicle can be turned right and left on the spot. At this time, the turning center is located in the vehicle body, so that the turning can be performed with a small turning radius. At that time, the turning wheel changes its direction and performs the following rotation.

For example, when the traverse mode switch is selected, the turning means is operated to turn the turning member about the longitudinal axis, and both drive wheels are turned 90 degrees with respect to the vehicle body (directly to the side). ). Here, since the drive wheels are each integral with the hydraulic motor, the turning can be easily and smoothly performed. Then, by driving the drive wheels in the normal and reverse directions via the hydraulic motor, the transport vehicle can be traversed right and left. At that time, the turning wheel changes its direction to a 90-degree shape and performs a follow-up rotation.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In addition,
4 and 12 are also used as a conventional example, and the same or almost the same components as those in the conventional example (FIGS. 4, 12, 14, and 15) are denoted by the same reference numerals and the details are omitted. I do.

That is, 1 is a vehicle body, 2 is a driving wheel, 3 is a turning wheel, 4 is an engine, 5 is a guide rail, 6 is a movable body,
7 is a mast, 8 is a guide roller, 9 is an elevating body, 10 is a fork, 11 is a lift cylinder, 13 is reach means,
14 is a supporting rod, 15 is a supporting pin, 16 is a connecting pin, 17
Is an operating cylinder, 20 is a driving section, 21 is a driver's seat, 22
Denotes an operation handle, 23 denotes an operation lever, and 25 denotes a shelf device.

The pair of left and right drive wheels 2 are provided so as to be able to turn 90 degrees relative to the vehicle body 2 (turn right beside). That is, the drive wheel 2 is linked to the hydraulic motor 30 side by its rim 2a being directly attached to the rotary flange (drive shaft) 31 of the hydraulic motor 30 via the connector 32. And the hydraulic motor 30
Is mounted horizontally on the vertical plate portion of the inverted L-shaped turning member 33, and the horizontal plate portion of the turning member 33 is vertically attached to the vehicle body 1 via the bearing 34 and the longitudinal axis 35. It is provided rotatably around the axis 36. At this time, the longitudinal axis 36 is configured to be located directly above the drive wheel 2.

The hydraulic motor 30, that is, the swing member 3
3 is provided with a turning means 40 for turning. The turning means 40 has a traversing cylinder 41. The traversing cylinder 41 has a cylinder body 42 attached to the vehicle body 2 side via a vertical pin 44 so as to be swingable, and a pinton rod 43 is mounted on one side. The pivot member 33 is connected to a link 45 connected thereto via a vertical connecting pin 46 so as to be relatively rotatable.

An arm 47 fixed to the left and right vertical axes 35 is connected to each other via a link 48 and a connecting pin 49 so as to be relatively rotatable. At that time, the link body 48
When both drive wheels 2 are oriented in the straight traveling direction, they are arranged so as to form a cross with respect to the left-right direction line connecting the left and right longitudinal axes 36. Therefore, by turning the turning member 33 via the link 45 by the operation of the traversing cylinder 41, the driving wheel 2 on one side is turned around the longitudinal axis 36 via the hydraulic motor 30 or the like, and And the drive wheel 2 on the other side can be turned around the vertical axis 36 and turned right beside via the arm 47 and the link body 48.
That is, according to the rotating means 40, the left and right driving wheels 2 are turned in opposite directions by the operation of the common traversing cylinder 41, and are directed to the side. An example of the rotating unit 40 is configured by the above 41 to 49 and the like.

A pair of hydraulic pumps 51 driven by the engine 4 are provided on the vehicle body 2 side. Then, so that the hydraulic pumps 51 correspond to the one hydraulic motor 30, that is, a two-pump two-motor type hydraulic drive system (HST system) is provided.
The corresponding hydraulic pump 51 and the hydraulic motor 30 communicate with each other via a pipe (eg, a hydraulic hose) 52.

The pair of right and left turning wheels 3 are provided so as to be able to turn to the vehicle body 2 by 180 degrees or more. In other words, the pair of left and right diverting wheels 3 are attached to the turning bracket 55 in a freely rotatable manner via the lateral axle 56 and the like. The turning bracket 55 is provided with a bearing 57.
And the longitudinal axis 59 with respect to the vehicle body 2 via the longitudinal axis 58 and the like.
Are provided so as to be rotatable around. At that time, the vertical axis 5
Numeral 9 is shifted in the front-rear direction with respect to the position of the axle 51, so that the whole is caster type.

The operation of the first embodiment will be described below. 1 to 4, solid lines in FIGS. 5 and 6, and FIG. 7 (a) show a pair of left and right driving wheels 2 and a pair of right and left turning wheels 3 in the front-rear direction. This shows a straight line. At this time, the rotating means 40
In this example, the traversing cylinder 41 is positioned in the middle, and the link body 48 is positioned so as to cross the line in the left-right direction. Such a transport vehicle includes an operator who sits on a driver's seat 21 of a driver 20 and operates the operation handle 2.
2 can be operated by maneuvering.

For example, as shown by a solid line in FIG. 2, the operating cylinder 17 of the reach means 13 is contracted and moved with the movable vehicle 6 and the mast 7 Can be moved laterally to the reach means 13 side, whereby the fork 10 can be retreated. In addition, the movable cylinder 6 and the mast 7 are laterally moved to the side away from the reach device 13 via the guide roller 8 by extending the operation cylinder 17 of the reach means 13, whereby the virtual line in FIG. 2 is shown. As described above, the fork 10 can be caused to protrude in the lateral direction.

By appropriately incorporating the lifting and lowering movement of the lifting and lowering body 9 by the lift cylinder 11, that is, the lifting and lowering movement of the fork 10, the intended conveyed goods can be unloaded. At the time of the above-described traveling movement, the driving direction is changed according to the rotational speed difference between the two drive wheels 2. That is, as shown in FIG. 7B, for example, when the rotation speed F on the right side is higher than the rotation speed f on the left side, the transport vehicle makes a left turn due to the difference in the rotation speed. At this time, since the pair of right and left diverting wheels 3 is of a caster type, the following rotation is performed while automatically changing the direction to the turning direction.

Thus, the transporting vehicle, for example, as shown in FIG.
As shown by a solid line to a virtual line in FIG. Note that a right turn can be performed in a similar manner by increasing the left rotation speed with respect to the right rotation speed. When the in-situ turning mode is selected, the traversing cylinder 41 is contracted by a predetermined amount (stopped halfway), as shown in FIG. Turned into a shape In this way, the fact that the drive wheel 2 has been turned is sensed by a sensor or the like,
The indicator lamp is illuminated, thereby enabling a turn-in-place mode.

Therefore, the hydraulic pressure from the pair of hydraulic pumps 51 driven by the engine 4 is supplied to the corresponding hydraulic motor 30 via the pipe 52 by the forward / reverse control in the driver's seat 21, so that the drive wheels 2 Can be driven in reverse, so that the transport vehicle can turn right and left. At this time, the turning center O is located in the vehicle body 1 and can turn on the spot with a small turning radius r.

For example, as shown by the solid line in FIG. 12, the transport vehicle is laid sideways on the shelf device 25 by normal traveling including the above-described turning, and then the normal traveling is switched to traversing traveling. , Transport vehicle to shelf device 2
5 can be sufficiently moved toward the front surface (the width can be shifted). This can be performed, for example, by operating a lever-type traversing mode switch (not shown) and operating the rotating means 40.

That is, in the turning means 40, the traversing cylinder 41 is extended by tilting the lever, and the one turning member 33 is turned around the vertical axis 36 via the link 45, The pivot member 33 on the other side is connected to the vertical axis 36 via the arm 47, the link body 48 and the like.
As shown in the imaginary line in FIG. 5 and FIG. 8B, the drive wheels 2 are turned 90 degrees (directly to the side) with respect to the vehicle body 1 as shown in FIG. .

Here, the drive wheels 2 are respectively
0, the turning can be easily and smoothly performed, and since the longitudinal axis 36 is located directly above the driving wheel 2, the driving wheel 2 is compact and has a 90-degree turning. Direction. In this way, 9 of the drive wheels 2
The sensor or the like senses that the 0-degree turning has been performed, that is, the drive wheel 2 has turned right and left, and turns on the indicator lamp, thereby enabling the traversing mode. Therefore, by driving the drive wheels 2 in the forward and reverse directions via the hydraulic motor 30, the transport vehicle can be traversed right and left, and the transport vehicle can be sufficiently brought to the front of the shelf device 25 ( Can be narrowed).

At this time, since the pair of right and left turning wheels 3 are caster-type, the directions thereof are automatically set to 90 degrees as shown in a virtual line in FIG. 6 and FIG. 8B. After that, the following rotation is performed. Since the transport vehicle can be easily moved to the front of the shelf device 25, that is, to the very edge of the load, it is not necessary to shift the width by turning back, and the fork 10 can stably load and unload the load.

During such traversing, as shown in FIG. 8 (b), the contraction action chamber of the traversing cylinder 41 has a small width, so that this clearance is used. Thus, the position, turning, correction, and the like during traversing can be performed. That is, by moving the piston rod 43 right and left within the range of the clearance width (about 30 ° left and right at the maximum), the position, turning, correction, and the like during traversing can be performed.

Of the various operations described above, the in-situ turning mode or the traversing mode is released by moving the piston rod 43 so as to return to the designated position (neutral position or a position matching the sensor of the operation handle 22). You can do it by moving it. Next, a second embodiment of the present invention will be described with reference to FIG. That is, as shown in FIG.
The link body 48 of the rotating means 40 is disposed so as to be parallel to the left-right direction line connecting the left and right longitudinal centers 36 when both drive wheels 2 face in the straight traveling direction.

According to the second embodiment, when the parallel movement mode is selected, the traversing cylinder 41 is contracted by a predetermined amount (stopped halfway) as shown in FIG. As a result, the left and right drive wheels 2 are inclined and turned in the same direction. In this way, the fact that the drive wheel 2 has been turned is sensed by a sensor or the like, and the indicator lamp is turned on, thereby enabling the parallel movement mode. Therefore, by driving the drive wheels 2 in the same direction via the hydraulic motor 30, the transport vehicle can be translated in the left and right inclined directions.

Next, a third embodiment of the present invention will be described with reference to FIG.
0 and FIG. That is, as shown in FIG. 10, one of a pair of left and right front wheels is a caster-type turning wheel 3, while the other is a turning wheel having a vertical axis 58 (vertical axis center 59) positioned on the wheel. 3A. The turning wheel 3A is configured to be steered by the operation handle 22.

According to the third embodiment, the turning wheel 3
Since A is turned just below the longitudinal axis 58, it does not protrude or intrude more than necessary with respect to the vehicle width at the time of the turn, so that it always turns at a predetermined position with stability. You will get. At that time, the turning wheel 3A needs a turning angle of 180 degrees or more in order to perform on-the-spot turning or driving shaft center turning, etc. In order to smoothly perform this, the speed is increased by a gear or a chain, Steering is performed using a hydraulic motor or the like.

That is, as shown in FIG. 11A, a pinion 60 is provided on the vertical axis 58, and this pinion 60
The rack 61 always meshed with the push-pull cylinder 6
2 is connected to the second piston rod 63. Therefore, by operating the push / pull cylinder 62 according to the turning angle of the operation handle 22, the turning of the turning wheel 3A by 180 degrees or more can be easily and smoothly realized.

Further, as shown in FIG.
A passive gear 65 is provided on the transmission 8, and a transmission gear 66 constantly meshed with the passive gear 65 is provided. A gear box 67 to which the operating handle 22 is linked is provided. A pitman arm 68 from the gear box 67 and the transmission gear 66 are linked via a drag link 69 and the like. The cylinder 70 is linked. Therefore,
With the speed increasing gear configuration including the passive gear 65 and the transmission gear 66, turning of the diverting wheel 3A by 180 degrees or more can be easily and smoothly realized.

In the third embodiment described above, one is the caster-type turning wheel 3 and the other is the turning wheel 3A in which the longitudinal axis 58 is located on the wheel. Both wheels may be the turning wheel 3A in which the longitudinal axis 58 is located on the wheel. In this case, the two-way directional wheels 3A are configured to be independently steered. In each of the embodiments described above, the traversing cylinder 41 is shown as a drive source of the rotating means 40, but this may be an electric motor, a hydraulic motor, or the like.

In each of the above embodiments, the rotating means 40
Although a traversing cylinder 41 acting on (or serving as) both driving wheels 2 is shown as a driving source for this, it may be a left-right independent traversing cylinder, an electric motor, a hydraulic motor, or the like. In this case, the driving mode can be freely switched by controlling the independent driving sources individually.

In each of the above-described embodiments, a two-pump two-motor type hydraulic drive system is employed as a drive type of the side fork type transfer vehicle. May be adopted. This case is particularly suitable for the parallel movement mode.
In each of the above-described embodiments, for example, a free-running side fork-type transfer vehicle used for transferring heavy objects and the like is described. The vehicle may be a side fork-type transfer vehicle that can travel on a given automated transfer line by catching the electromagnetic waves on the guide line.

In each of the above-described embodiments, a four-wheel type in which a pair of left and right driving wheels 2 and a pair of right and left turning wheels 3 are provided is shown. It may be a three-wheel type provided with (one wheel) turning wheel 3.

[0040]

According to the first aspect of the present invention, various driving modes such as traversing, turning in place, and parallel movement can be realized. Therefore, the transporting vehicle can be easily moved to the front of the shelf device, that is, to the very edge of the luggage, so that it is not necessary to shift the width by turning back, and the luggage can be always stably taken in and out by the fork. .

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the present invention and is a partially cutaway side view of a side fork-type transfer vehicle.

FIG. 2 is a vertical sectional front view of the side fork-type transfer vehicle.

FIG. 3 is a partially cutaway plan view of the side fork-type transfer vehicle.

FIG. 4 is a schematic perspective view of the side fork-type transfer vehicle.

FIG. 5 is a partially cutaway front view of a drive wheel portion of the side fork-type transfer vehicle.

FIG. 6 is a partially cutaway front view of a turning wheel portion of the side fork-type transfer vehicle.

FIGS. 7A and 7B are schematic plan views of the side fork-type transfer vehicle, where FIG. 7A shows a straight traveling state and FIG. 7B shows a normal turning state.

FIGS. 8A and 8B are schematic plan views of the side fork-type transfer vehicle, wherein FIG.

FIG. 9 is a schematic plan view of a side fork-type transfer vehicle according to a second embodiment of the present invention, in which (a) shows a straight traveling state and (b) shows a parallel movement state.

FIG. 10 is a schematic plan view of a side fork-type transfer vehicle, showing a third embodiment of the present invention.

11A and 11B are explanatory diagrams of a speed increasing wheel, and FIG. 11B is an explanatory diagram of a steering speed increasing, in a turning wheel portion of the side fork type transfer vehicle.

FIG. 12 is a schematic plan view comparing the operation of the present invention and the conventional example.

FIG. 13 is a schematic plan view showing a conventional example when a side fork-type transfer vehicle turns.

FIG. 14 is a vertical sectional front view of the side fork-type transfer vehicle.

FIG. 15 is a partially cutaway side view of the side fork-type transfer vehicle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body 2 Drive wheel (rear wheel) 3 Diverting wheel (front wheel) 3A Diverting wheel (front wheel) 4 Engine 7 Mast 10 Fork 13 Reach means 17 Working cylinder 20 Operating part 25 Shelf device 30 Hydraulic motor 31 Rotating flange ( Drive shaft) 33 revolving member 35 longitudinal axis 36 longitudinal axis center 40 rotating means 41 traversing cylinder 48 link body 51 hydraulic pump 55 revolving bracket 58 longitudinal axis 59 longitudinal axis center

Claims (1)

[Claims] 1. A vehicle body is provided with a pair of left and right drive wheels and a turning wheel, and a mast that is reciprocally movable in a left-right direction is provided. A fork that is movable up and down is provided on the mast side. A side fork-type transfer vehicle provided with a reach means for moving a fork in a left-right direction, wherein both drive wheels are respectively operatively connected to a drive shaft on a hydraulic motor side, and both hydraulic motors are respectively connected to a vehicle body side. In addition to the above, a turning means attached to a turning member rotatably provided around a vertical axis is provided, and turning means for turning the turning member is provided, and a hydraulic pump driven by an engine is provided on the vehicle body side. Wherein the hydraulic motor is connected to the hydraulic pump, and the diverting wheel is provided rotatably around a vertical axis with respect to the vehicle body. Type transportation vehicle.