JP2002104225A - Side fork type conveying vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a side fork type conveying vehicle capable of carrying out a transfer of a traveling mode from a straight advance mode to a lateral advance mode and always stably carrying out the lateral advance traveling at a straight. SOLUTION: A pair of right and left driving wheels 4 is turnably provided just beside around a vertical axis center 37 with a traveling driving means 31 respectively. A driving wheel turning means 40 is constituted such that any one of driving wheels 4 can be changed from a just beside turning operation attitude to an inclined attitude. A pair of right and left direction-change wheel 3 is turnably provided just beside around a vertical axis center 59 respectively. A steering wheel turning means 60 is constituted such that a just beside turning attitude is maintained to a fixed state. Since any one of driving wheels 4 is made to an inclined state, it can be absorbed that the driving wheel 4 side is preceding-traveled by a ratio of a shaft weight at the direction-change wheel 3 and the driving wheel 4 and a rolling resistance of the direction-change wheel 3 to carry out a lateral traveling at a straight.

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 a side fork type transfer vehicle, for example, a structure shown in FIGS. 10 to 13 has been provided. That is, the vehicle body 2 of the side fork-type transfer vehicle 1 can travel on the floor or the like via the turning wheel (front wheel) 3 and the driving wheel (rear wheel) 4, and at this time, the vehicle travels on the vehicle body 2. This is performed by forcibly rotating the driving wheels 4 by the driving force of the engine 5 mounted on the vehicle.

The vehicle body 2 is provided with a pair of left and right guide rails 6 provided in front and rear directions, and a movable body 7 is provided between the guide rails 6. Is erected. A pair of left and right guide rollers 9 are provided before and after the movable body 7 and the mast 8, respectively. The guide rollers 9 are fitted to and guided by the guide rails 6, so that the movable body 7 and the mast 8 It is configured to be able to reciprocate in the left-right direction. An elevating body 10 guided by both masts 8 is provided, and this elevating body 10 is provided with a fork 11 that faces in the left-right direction. The lifting body 10
Is moved up and down by the lift cylinder 12.

[0004] Reach means 14 is provided for protruding the fork 11 in the left-right direction. The reach means 14 includes a pair of support rods 15 erected from the vehicle body 2 side,
A front-back support pin 16 provided between the upper ends of both support rods 15, an operating cylinder 18 having a main body connected to the support pin 16 and a piston rod connected to the mast 8 via a connection pin 17; It consists of. An operating section 20 is provided at the front of the vehicle body 2 and on one side, and the operating section 20 is equipped with a driver's seat 21, an operating handle 22, an operating lever 23 group, and the like.

According to such a conventional structure, the movable body 7 and the mast 8 are laterally moved via the guide roller 9 by extending the operation cylinder 18 of the reach means 14 as shown by the phantom line in FIG. Let it be fork 1
1 may be moved laterally. Further, as shown by a solid line in FIG. 13, by contracting the working cylinder 18, the movable body 7 and the mast 8
Can be laterally moved in the reverse direction, so that the fork 11 can be retracted.

[0006] By appropriately incorporating the lifting / lowering movement of the lifting / lowering body 10 by the lift cylinder 12, that is, the lifting / lowering movement of the fork 11, it is possible to load / unload the intended conveyed goods. In addition, the above-described operations and transport traveling are performed by the driving unit 2.
The operation is performed by the driver who has boarded the “0” operating the operation handle 22, the operation levers 23, and the like.

[0007]

According to the above-described conventional side fork-type transfer vehicle 1, a traveling mode such as traversing is impossible. This is because, in the above-mentioned conventional engine type, the driving force is mainly connected mechanically such as a manual transmission, a torque transmission, and a differential, so that it is difficult to turn the driving wheels. This is because the direction of the wheels 4 is fixed and the turning wheels 3 are turned one by one. As shown in FIG. 11, the side fork-type transfer vehicle 1 turns by turning the turning wheel 3 in response to the operation of the operation handle 22. At this time, the turning center O is turned.
Is on the extension of the drive shaft (fixed shaft), the turning radius R also increases.

Therefore, as shown in FIG.
When the vehicle is turned and laid sideways on the shelf device 25, it cannot be moved sufficiently against the front surface of the shelf device 25. Further, a troublesome switching S is required, and even if the switching S is performed, it is not possible to perform a sufficient width adjustment. As a result, the vehicle body 2 is separated from the load in the shelf device 25, and the center of load approaches the tip of the fork 11, so that the vehicle body 2 easily falls.

Accordingly, the invention according to claim 1 of the present invention provides a side fork-type transfer vehicle capable of shifting the traveling mode from the straight traveling mode to the traversing mode, and capable of always steadily traversing linearly and stably. It is intended for that purpose.

[0010]

According to a first aspect of the present invention, there is provided a side fork-type transfer vehicle having a pair of left and right drive wheels and a pair of left and right drive wheels with respect to a vehicle body. Direction wheels are provided so as to be rotatable around the vertical axis, respectively, and a mast is provided on the vehicle body so as to be reciprocally movable in the left and right direction. A side fork-type transport vehicle provided with a reach means for moving back and forth in the left-right direction, wherein both drive wheels are provided so as to be rotatable laterally about the longitudinal axis together with the travel drive means. ,
Driving wheel rotating means for performing rotation is provided, and the driving wheel rotating means is configured to be able to change one of the driving wheels to an inclined posture from a sideways rotating operation posture, , Each of which is provided rotatably in a horizontal direction about the longitudinal axis, and is provided with turning wheel turning means for turning, and the turning wheel turning means has a fixed horizontal turning posture. It is characterized by being constituted so that it can be maintained.

Therefore, according to the first aspect of the present invention, the right and left turning wheels and the left and right driving wheels are oriented in the front-rear direction during normal traveling. By operating the reach means with the side fork-type transfer vehicle stopped, the movable body and the mast can be laterally moved to the reach means side, and the fork can be moved in and out. Further, by operating the reach means in the reverse direction, the movable body and the mast can be laterally moved to a side away from the reach device, and the fork can be protruded in the lateral direction. By incorporating the fork's elevating movement as appropriate, the intended conveyed goods can be unloaded.

When switching from normal traveling to traversing traveling, for example, a lever type traversing mode switch is operated,
The driving wheel turning means and the turning wheel turning means are operated. That is, the drive wheel rotating means is operated to rotate the pair of drive wheels around the vertical axis so as to be turned right sideways (90 degrees) with respect to the vehicle body. Here, since the pair of drive wheels are each integrated with the traveling drive means, the lateral turning can be easily and smoothly performed. At about the same time, the turning wheel turning means is operated to turn the pair of turning wheels around the longitudinal axis so as to turn right and left with respect to the vehicle body. At that time, the turning posture of the turning wheel in the horizontal direction can be kept fixed.

As described above, after the two drive wheels are turned to the right side by the operation of the drive wheel turning means, one of the drive wheels is changed from the sideways turning operation posture to the inclined posture. . In this way, the traversing mode is enabled by the turning wheels or the driving wheels turning right or sideways. Therefore, by controlling the drive of the traveling drive means in the forward and reverse directions, both drive wheels can be driven in the forward and reverse directions, and the side fork-type transfer vehicle can travel laterally in the left and right directions. At this time, the pair of right and left diverting wheels follow and rotate while maintaining the horizontal horizontal rotation posture in a fixed state.

At this time, since one of the drive wheels is inclined, traversing can be performed in a straight line. That is, when all of the diverting wheels and the driving wheels are diverted in the horizontal direction, the driving wheel side traverses ahead in advance due to the ratio of the axle load on each wheel and the rolling resistance of the diverting wheels, and so on. It becomes a curved traverse. At this time, by changing the drive wheels in an inclined manner, the ratio of the axial load and the rolling resistance can be absorbed, so that the traversing can be performed linearly and stably.

As described above, the traversing can be performed while ensuring the straight traveling performance, so that the side fork-type transfer vehicle can be easily brought to the very front of the shelf device or the like (the width can be shifted). It is possible to eliminate the need to shift the width by turning back, and it is possible to stably load and unload the luggage with the fork 11.

In order to shift (return) from the traversing mode to the straight traveling mode, the driving wheel rotating means turns the pair of driving wheels in the front-rear direction with respect to the vehicle body by the operation reverse to that described above (the straight traveling state). (Converted to). At the same time, the turning wheel turning means turns the pair of turning wheels in the front-rear direction (turns straight) relative to the vehicle body by the reverse operation.
As a result, the transition from the traversing mode to the straight traveling mode can be smoothly performed, and the side fork-type transport vehicle can be brought straight.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below.
This will be described with reference to FIGS. FIG. 12 is also used as a conventional example, and a conventional example (FIGS. 11 to 13)
The same or substantially the same components as those described above are denoted by the same reference numerals, and the details thereof are omitted.

1 to 3, reference numeral 1 denotes a side fork-type transfer vehicle, 2 denotes a vehicle body, 3 denotes a turning wheel (front wheel), 4 denotes a driving wheel (rear wheel), 5 denotes an engine, and 6 denotes a guide. Rail, 7 is a movable body, 8 is a mast, 9 is a guide roller, 10 is an elevating body, 11 is a fork, 12 is a lift cylinder, 14 is a reach means, 15 is a support rod, 16 is a support pin, 17 is a connection pin, Reference numeral 18 denotes an operation cylinder, 20 denotes an operation unit, 21 denotes a driver's seat, 22 denotes an operation handle, 23 denotes an operation lever, and 25 denotes a shelf device.

In the side fork-type transfer vehicle 1, a pair of left and right turning wheels 3 and a pair of left and right driving wheels 4 are provided so as to be rotatable in a horizontal direction (90 degrees) with respect to the vehicle body 2, respectively. I have. That is, as shown in FIG. 1 to FIG. 4 and FIG. 6, the rims 4 </ b> A of the pair of left and right drive wheels 4 are respectively connected to a rotating flange (drive shaft) 32 of a hydraulic motor (one example of a traveling drive unit) 31. And is linked to the hydraulic motor 31 side by being directly attached via the

The mounting of the hydraulic motor 31 is reversed L
The horizontal plate portion of the turning member 34 is attached to the vertical plate portion of the
5 and the longitudinal axis 36, the longitudinal axis 37 with respect to the vehicle body 2 side.
Are provided so as to be rotatable around. At that time, the vertical axis 3
7 is configured to be located directly above the drive wheel 4. Thus, both drive wheels 4 are provided rotatably around the longitudinal axis 37 together with the hydraulic motor 31.

The hydraulic motor 31, that is, the turning member 3
4, a driving wheel turning means 40 for turning the driving wheel 4 is provided.
One of the driving wheels 4 is configured to be changeable to the inclined posture. The driving wheel rotating means 40 is composed of a tilting cylinder 41, a driving wheel traversing cylinder 46, and the like.

That is, the tilting cylinder 41 is a pair of left and right sides, and the respective main bodies 41a are linearly integrated (connected). At this time, the piston rods 41c connected to the pistons 41b of the tilting cylinders 41 protrude outward in the vehicle width direction. The arm 42 and the protruding end of the piston rod 41c connected from the longitudinal axis 36 side are relatively rotatably connected via a link 43 and vertical connecting pins 44 and 45. .

The driving wheel traversing cylinder 46 has a main body 46a arranged in the vehicle width direction and a connecting pin 47.
And is swingably connected to the vehicle body 2 via the. The piston rod 4 connected to the piston 46b
6c is projected in the vehicle width direction, and the tilt cylinder 4
1 is connected to the main body 41a side via a connecting pin 48 so as to be relatively swingable.

According to the driving wheel rotating means 40, the main body 41a of the two tilting cylinders 41 is integrally moved in the vehicle width direction when the driving wheel traversing cylinder 46 is extended in the vehicle width direction. At this time, when both the tilting cylinders 41 are locked, the piston rod 41c is also integrally moved in the vehicle width direction. Thus, by rotating the vertical axis 36 via the link 43, the arm body 42, or the like, the drive wheel 4 can be turned around the vertical axis center 37 via the turning member 34 or the like, and can be turned sideways. .

That is, by the operation of the drive wheel traversing cylinder 46, the left and right drive wheels 4 are configured to turn in the same direction and to face sideways. Then, in the sideways rotational operation posture, one of the left and right tilting cylinders 41 is extended to move the extended drive wheel 4 via the link 43 or the arm body 42 to the vertical axis 3.
6 is rotated so that the vertical axis 3
7 can be changed from a straight side to an inclined state.

According to the above 41 to 48 and the like, the pair of left and right driving wheels 4 is rotated right and left around the longitudinal axis 37, and one of the driving wheels 4 is moved from the right and left rotating operation posture. An example of the driving wheel turning means 40 for changing the inclination attitude is configured.

A pair of hydraulic pumps 50 driven by the engine 5 are provided on the vehicle body 2 side. The hydraulic pump 50 is connected to one hydraulic motor 31.
In other words, the corresponding hydraulic pump 50 and the hydraulic motor 31 are communicated via a pipe (hydraulic hose or the like) 51 so as to correspond to the above, that is, to form a two-pump two-motor type hydraulic drive system (HST system). ing.

As shown in FIGS. 1 to 3, 5, and 6, the pair of left and right turning wheels 3 each have a rim 3 A having a transverse axle 56 on a vertical plate portion of the turning member 55.
It is freely rotatable through a rotating member 5 and the like.
The horizontal plate portion 5 is provided rotatably around a vertical axis 59 with respect to the vehicle body 2 via a bearing 57 and a vertical axis 58.

A turning wheel turning means 60 for turning the pair of right and left turning wheels 3 around a vertical axis 59 is provided. The turning wheel turning means 60 fixes the horizontal turning posture in a fixed state. It is configured to be maintainable. The turning wheel rotating means 60 is constituted by a turning cylinder 61, a turning wheel traversing cylinder 63, and the like.

That is, the main body 61a of the turning cylinder 61 is arranged in the vehicle width direction, and the piston rod 61c connected to the piston 61b protrudes on both sides in the vehicle width direction. And the piston rod 61
The protruding both ends of c are respectively fixed to the vehicle body 2 side via the holding frame 62, so that the main body 61a is configured to be movable in the vehicle width direction.

The diverting wheel traversing cylinders 63 are a pair of left and right, and the respective main bodies 63a are integrated (connected) to the main body 61a of the diverting cylinder 61 via a connecting member 64. At this time, the piston rods 63c connected to the pistons 63b of the diverting wheel traversing cylinders 63 respectively protrude outward in the vehicle width direction.
The arm 65 continuously connected from the longitudinal axis 58 and the protruding end of the piston rod 63c are relatively rotatably connected via a link 66, vertical connecting pins 67, 68, and the like. .

According to the turning wheel rotating means 60, the turning cylinder 61 is operated by the fixed piston rod 61.
This is performed by moving the main body 61a in the vehicle width direction with respect to c, and the main body 63a of the diverting wheel traversing cylinder 63 is moved in the vehicle width direction integrally with the main body 61a of the diverting cylinder 61. At this time, the connecting members 6 are provided between the holding frames 62.
The guide body 69 penetrating through the guide body 6 is provided.
9, the movement guide and the rotation prevention of the main bodies 61a and 63a are performed.

A restricting means 70 is provided for maintaining the turning posture of the turning wheel 3 in a horizontal position in a fixed state. The restricting means 70 includes a stopper 71 provided on the link 66 side, a stopper 73 provided on the vehicle body 2 side via a bracket 72, and the like.
Then, when the diverting wheel 3 is rotated right and left around the longitudinal axis 59, the stopper body 71 is brought into contact with the stopper body 73 and the horizontal rotation is regulated. Have been. Note that the stopper body 73 has a stopper position that can be freely adjusted by a bolt type or the like.

Therefore, the turning wheel traversing cylinder 63
By turning the vertical axis 58 through the link 66, the arm body 65, and the like, the turning wheel 3 is turned around the vertical axis center 59 via the turning member 55, etc. I can turn. That is, by the operation of the diverting wheel traversing cylinder 63, the left and right diverting wheels 3 are configured to be turned in opposite directions to each other and to be directed sideways. The horizontal rotation is regulated by the regulating means 70.

With the above-described parts 61 to 73 and the like, the pair of left and right turning wheels 3 can be turned around the longitudinal axis 59, and the turning posture can be maintained in a fixed state. An example of the moving means 60 is configured. The operation of the diverting cylinder 61 is configured to be performed by turning the operation handle 22 using Orbit Roll (registered trademark) (all hydraulic power steering).

The operation of the above embodiment will be described below. 1 to 3, solid lines in FIGS. 4 and 5 and FIG. 6 show a pair of right and left turning wheels 3 and a pair of right and left driving wheels 4 facing in the front-rear direction, and thus show a straight traveling in normal traveling. ing. At this time, in the drive wheel rotating means 40, both the tilt cylinder 41 and the drive traverse cylinder 4 are used.
6 are both contracted. In such a side fork-type transfer vehicle 1, an operator sitting on the driver's seat 21 of the driving section 20 can operate the operation handle 22 or the like to travel back and forth.

For example, with the transport vehicle 30 stopped, the movable cylinder 18 of the reach means 14 is contracted and moved through the guide roller 9 as shown by the solid line in FIG. Mast 8 reach means 1
The fork 11 can be moved backward by moving the fork 11 sideways.

The operating cylinder 1 of the reach means 14
8, the movable body 7 and the mast 8 are laterally moved to the side away from the reach means 14 via the guide rollers 9, and the fork 11 is laterally moved as shown by the imaginary line in FIG. Direction. By appropriately incorporating the lifting and lowering movement of the lifting and lowering body 10 by the lift cylinder 12, that is, the lifting and lowering movement of the fork 11, it is possible to load and unload the intended transported object.

In the above-described forward and backward running movement, the direction is changed in accordance with the operation of the operation handle 22. That is, for example, by turning the operation handle 22 to the left, the operation shown in FIG.
As shown in the figure, the main body 61a of the turning cylinder 61
Is operated to the right by the orbit roll, and the connecting material 64
, The main body 63a of the double-wheel traversing cylinder 63 is integrally moved to the right. At this time, the two-way traversing wheel traversing cylinder 63 is in a non-operating posture at a predetermined contraction limit and plays a role of a link.

Therefore, the double-sided wheel traversing cylinder 6
3 can be moved to the right through the link 66 via the arm 65.
, The turning member 55 is turned around the longitudinal axis 59, and the turning wheel 3 is turned to turn left. At the time of normal turning in response to the operation of the operation handle 22, one side of the diverting wheel traversing cylinder 63 is pulled, so that a check valve is arranged in the circuit to suppress leaks, It is configured to periodically apply pressure to the traversing cylinder 63.

Thus, the side fork-type transfer vehicle 1 can be turned leftward and beside the shelf device 25, for example, as shown by a solid line to an imaginary line in FIG. In the same manner as described above, by turning the operation handle 22 to the right, the vehicle can turn right.

For example, as shown by the imaginary line in FIG.
After the side fork-type transport vehicle 1 is laterally mounted on the shelf device 25 and then switched from the normal travel to the traverse travel, the side fork-type transport vehicle 1 can be sufficiently moved toward the front surface of the shelf device 25 (width). Can be approached).

When switching from such normal running to traversing running, for example, a lever type traversing mode switch (not shown) is operated to operate the driving wheel turning means 40 and the turning wheel turning means 60.

That is, in the driving wheel rotating means 40, the lever is tilted to extend the driving wheel traversing cylinder 46 by the pressurized oil via the valve group, and the link-shaped both tilting cylinder 41 is moved by the contraction lock. Move in the width direction and the extension direction. As a result, the pivot members 34 are pivoted in the same direction about the longitudinal axis 37 via the link 43 and the arm 42, and the imaginary line in FIG.
As shown in (2), both drive wheels 4 are turned to the side of the vehicle body 2 (turned to 90 degrees).

Here, the driving wheels 4 are
Since it is integral with the drive wheel 1, it can be easily turned in the horizontal direction easily and smoothly. Further, since the longitudinal axis 37 is located directly above the drive wheel 4, the drive wheel 4 and the like can be made compact. It is possible to perform the horizontal turning.

At the same time, in the diverting wheel rotating means 60, the diverting wheel traversing cylinder 63 is extended by the pressurized oil. At this time, for example, as shown in FIG. 7B, the right turning wheel traversing cylinder 63 is first extended and the projecting motion of the piston rod 63c is transmitted to the arm body 65 via the link 66. As a result, the turning member 55 is rotated around the longitudinal axis 59, and the right turning wheel 3 is turned with respect to the vehicle body 2.

The above-described right turning wheel traversing cylinder 6
As shown in FIG. 7 (c), the turning of the right turning wheel 3 by the extension movement of the third wheel 3 causes the stopped body 71 on the right turning wheel 3 side to hit the stopper body 73 on the vehicle body 2 side. The right turning wheel 3 is turned rightward (90 degrees) with respect to the vehicle body 2, and the posture can be maintained by the restricting means 70.

Around the time of such regulation,
The left turning wheel traverse cylinder 63 is extended, and the projecting motion of the piston rod 63c is transmitted to the arm body 65 via the link 66, whereby the turning member 55 is turned around the longitudinal axis 59. Thus, the left turning wheel 3 is turned with respect to the vehicle body 2.

The turning of the left turning wheel 3 by the extension movement of the left turning wheel traversing cylinder 63 as shown in FIG. 8 is performed by the stopper 71 on the left turning wheel 3 side as shown in FIG. Is restricted by being brought into contact with the stopper body 73 on the vehicle body 2 side.
(Degree) and the posture is regulated by the regulating means 70.
Can be maintained.

Then, the cylinder 63 for both-way traversing wheels is
When fully extended, it is automatically positioned at the center, and similarly, the turning cylinder 61 is automatically returned to neutral. Thereby, regardless of the position of the operation handle 22, that is, without positioning the operation handle 22 in a neutral position (even when the operation handle 22 is turned off from straight ahead), the diverting wheels 3 on both sides are placed directly beside the vehicle body 2. As a result, the posture can be firmly positioned by the regulating means 70, and the transition from the straight traveling mode to the traversing mode can be smoothly performed.

As described above, the operation of the drive wheel rotating means 40 causes both drive wheels 4 to be turned to the side of the vehicle body 2 as shown by the solid line in FIG. One of the drive wheels 4 is changed from the dynamic operation posture to the inclined posture.

That is, when the side fork type transfer vehicle 1 in the traversing mode is traversed leftward, the left tilt cylinder 61 is extended and the left link 43 is moved.
The vertical axis 36 is rotated via the arm 42 or the like. Thereby, as shown in the imaginary line in FIG. 8 and FIG. 9A, the left driving wheel 4 is further turned around the vertical axis 37 via the turning member 34 or the like, and Can be changed to an outwardly open inclined shape (around 3 °).

When the side fork-type transfer vehicle 1 in the traversing mode is traversed rightward, the right tilt cylinder 61 is extended from the state shown by the solid line in FIG. The vertical axis 36 is rotated via the like. As a result, as shown in FIG. 9B, the right driving wheel 4 is further turned around the vertical axis 37 via the turning member 34 or the like, so that the right driving wheel 4 is inclined from the horizontal to the outward. (Around 3 °).

In this way, the turning wheels 3 and the driving wheels 4 have turned straight or inclined, that is, as shown in FIGS. 9 (a) and 9 (b). 3 and drive wheels 4
Is detected by a sensor as having been turned as specified, and an indicator lamp is turned on, thereby enabling a traversing mode.

Therefore, the hydraulic pressure from the pair of hydraulic pumps 50 driven by the engine 5 is supplied to the corresponding hydraulic motor 31 via the pipe 51 by forward / reverse control in the driver's seat 21, so that both drive wheels are driven. 4 can be driven in the opposite direction to cause the side fork-type transfer vehicle 1 to travel laterally on the left and right. At this time, the pair of right and left diverting wheels 3 are rotated in a state of keeping the horizontal horizontal rotation posture in a fixed state.

At this time, since the drive wheels 4 on the traverse traveling side are inclined outwardly, the traversing traveling can be performed in a straight line.
That is, as shown by the solid line in FIG. 8, when all of the diverting wheel 3 and the driving wheel 4 are diverted sideways, the ratio of the axle load on the diverting wheel 3 and the driving wheel 4 and the diverting wheel Due to the rolling resistance of No. 3 and the like, the drive wheel 4 side (rear side of the vehicle) is traversed in advance, and as shown by a solid arrow C in FIG.

At this time, as shown by a virtual line in FIG. 8 and FIGS. 9A and 9B, the drive wheel 4 on the traversing side is changed to an outwardly open inclined shape, so that the ratio of the axial load is increased. And the rolling resistance can be absorbed.
As shown by solid arrows d in FIGS. 9A and 9B,
It can be performed linearly and stably.

As described above, the vehicle can be traversed while maintaining the straight traveling performance, so that the side fork-type transfer vehicle 1 can be easily brought to the front of the shelf device 25, that is, to the very end of the load (the width of the vehicle can be increased). In addition, it is possible to eliminate the need for width adjustment by turning back, and to stably load and unload luggage with the fork 11. In addition, since the vehicle can travel in a transverse direction, for example, a long object can be easily transported via the fork 11.

The transition (return) from the traversing mode to the straight traveling mode is performed as follows. That is, in the driving wheel rotating means 40, by inclining the lever, the pressure oil through the valve group causes the extending tilting cylinder 41 to contract and move, and the driving wheel traverse cylinder 46 to contract and move. Thus, the two drive wheels 4 are turned in the front-rear direction with respect to the vehicle body 2 (turned straight) by the reverse operation to the above.

At the same time, the diverting wheel turning means 60 causes the diverting wheel traversing cylinder 63 to contract and move by the pressurized oil, and moves the diverting wheel 3 in the front-rear direction with respect to the vehicle body 2 by the reverse operation. Turn in the direction (turn straight). At this time, by holding the neutralization of the turning cylinder 61,
The turning of the two turning wheels 3 can be performed reliably. As described above, the transition from the traversing mode to the straight traveling mode can be smoothly performed, and the side fork-type transfer vehicle 1 can be set in the straight traveling state.

In the above-described embodiment, a two-pump two-motor type hydraulic drive system is adopted as the drive type of the side fork type transfer vehicle 1, but this is a one-pump two-motor type hydraulic drive system. May be adopted. This case is particularly suitable for the parallel movement mode.
Further, an electric drive system using an electric motor may be employed.

In the above-described embodiment, the free-running side-fork type transport vehicle 1 used for transporting heavy objects, for example, is shown. This is, for example, a pickup coil provided on the vehicle body side. By catching the electromagnetic waves on the floor-side guide line, the vehicle may be a side fork-type transfer vehicle that can travel on a given automated transfer line.

In the above-described embodiment, the driving source of the driving wheel rotating means 40 is a combination of the tilt cylinder 41 and the driving wheel traversing cylinder 46. Although the combination configuration of the turning cylinder 61 and the turning wheel traverse cylinder 63 is shown, these may be an electric motor, a hydraulic motor, or the like.

In the above-described embodiment, one of the driving wheels 4 can be changed to the inclined posture, and both the left and right driving wheels 4 can be changed from a straight side to an outwardly inclined (about 3 °). Although the type in which the drive wheels 4 are selectively used is adopted, this may be a type in which only one of the drive wheels 4 is changed from a straight side to an outwardly inclined shape or an inwardly inclined shape. In this case, the other drive wheel 4
May be positioned by the restricting means 70 described above.

In the above-described embodiment, the angle of inclination is about 3 °, but this can be changed (increased / decreased) depending on the type (feature) of the side fork type transfer vehicle.

[0066]

According to the first aspect of the present invention, the switching from the normal traveling to the traversing traveling is performed by activating the driving wheel rotating means and rotating the pair of driving wheels about the vertical axis. By turning the turning wheel rotating means around the vertical axis and turning the pair of turning wheels around right and left to turn straight to the side (90 degrees) and turn the turning wheel turning means, it is easy and smooth. Can be done. Then, after both drive wheels are turned to the sideways direction, by changing either one of the drive wheels to the inclined position from the sideways rotational operation posture, the traversing mode becomes possible.

Therefore, by controlling the driving of the traveling drive means in the forward and reverse directions, both drive wheels can be driven in the forward and reverse directions, and the side fork-type transfer vehicle can travel in the left and right directions. , And follow up while maintaining the horizontal rotation posture in a fixed state. At this time, by making one of the drive wheels inclined, it is possible to absorb that the drive wheel side runs ahead due to the ratio of the axle load on the diverting wheel or the driving wheel or the rolling resistance of the diverting wheel. Traversing can be performed in a straight line. This makes it possible to provide a side-fork-type transfer vehicle that can shift the traveling mode between the straight traveling mode and the traversing mode, and can always perform traversing stably in a straight line.

[Brief description of the drawings]

FIG. 1 shows an example of an embodiment of the present invention, and is a side view of a side fork-type transfer vehicle during normal running.

FIG. 2 is a plan view of the side fork-type transfer vehicle.

FIG. 3 is a vertical sectional front view of the side fork-type transfer vehicle.

FIG. 4 is a partially cutaway front view of a drive wheel portion of the side fork-type transfer vehicle.

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

FIG. 6 is an explanatory view of a drive wheel portion and a turning wheel portion in the side fork type transfer vehicle, and is a partially cutaway plan view when the vehicle is traveling straight.

FIGS. 7A and 7B are explanatory diagrams of an operation of a turning wheel portion in the side fork-type transfer vehicle, wherein FIG. 7A shows turning, FIG. 7B shows the start of crossing switching, and FIG.

FIG. 8 is an explanatory view of a drive wheel portion and a turning wheel portion in the side fork-type transfer vehicle, and is a partially cutaway plan view when the vehicle is traversing.

FIGS. 9A and 9B are schematic plan views of the side fork-type transfer vehicle, wherein FIG. 9A is a left traverse and FIG. 9B is a right traverse.

FIG. 10 is a schematic plan view comparing the operation of the present invention and the conventional example.

FIG. 11 is a schematic plan view showing a conventional example when a side fork-type transfer vehicle turns.

FIG. 12 is a perspective view of the side fork-type transfer vehicle.

FIG. 13 is a vertical sectional front view of the side fork-type transfer vehicle.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 side fork type transfer vehicle 2 body 3 turning wheel 4 drive wheel 5 engine 8 mast 10 elevating body 11 fork 14 reach means 18 operating cylinder 20 operating unit 22 operating handle 25 shelf device 31 hydraulic motor (running driving means) 32 rotation Flange (drive shaft) 34 Revolving member 37 Vertical axis 40 Drive wheel rotating means 41 Tilt cylinder 42 Arm body 43 Link 46 Driving wheel traverse cylinder 50 Hydraulic pump 55 Revolving member 59 Vertical axis 60 Redirecting wheel rotating means 61 Replacement Direction cylinder 63 Diversion wheel traversing cylinder 65 Arm body 66 Link 69 Guide body 70 Restriction means 71 Stopped body 73 Stopper body

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) B66F 9/10 B66F 9/10 C

Claims (1)

[Claims] 1. A pair of left and right driving wheels and a pair of left and right turning wheels are provided so as to be rotatable around a vertical axis with respect to a vehicle body, and the vehicle body is reciprocally movable in the left and right direction. A mast is provided, and a side fork type transfer vehicle is provided with a fork which is movable up and down on the mast side, and a reach means for moving the fork in a left-right direction is provided. Each is provided so as to be rotatable in a horizontal direction about the longitudinal axis together with the traveling drive means, and a drive wheel rotating means for performing rotation is provided. , One of the drive wheels is configured to be changeable to an inclined posture, and the two changeover wheels are respectively provided rotatably in a horizontal direction about the longitudinal axis, and the turnover wheel is rotated to perform the turn. Means are provided for The side fork-type transfer vehicle, wherein the moving means is configured to be able to maintain the horizontal turning posture in a fixed state.