JP2002037595A - Working vehicle with traversing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a working vehicle with a traversing system, permitting the steering of front and rear wheels to be turned just beside and easy attachment/detachment and stable mounting of a battery. SOLUTION: A vehicle body 2 is provided with a pair of right and left front wheels 3 and a pair of right and left rear wheels 4 each turnable 90 deg.. The front wheels 3 are provided on side of the vehicle body 2 so as to be rotatable around a vertical axis 23, with front wheel rotating means 40 for rotating operation. The rear wheels 4 are provided on the side of the vehicle body 2 so as to be rotatable around a vertical axis 54, with rear wheel rotating means 60 for rotating operation. The battery 70 mountable on the vehicle body 2 has a wider front portion 70a movable to the direction of a vehicle length between the rear wheels 4 in straight-run attitude and a narrower rear portion 70b placeable between the rear wheels 4 in traverse-run attitude.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work vehicle having a traversing system capable of switching to traversing.

[0002]

2. Description of the Related Art Conventionally, vehicles having a traversing system are found in large-sized transport vehicles, some loaders, and the like, and in forklifts, reach-type electric vehicles exist. Also,
There is a side forklift that handles long objects, with masts and forks attached horizontally to the movement of the vehicle. However, in counter-type forklifts,
In addition to normal work, there is no one that can traverse and have the same function as a side fork. In order to establish such a forklift, it is necessary to steer the front wheels, which are the drive wheels, so as to face right beside.

That is, a conventional forklift 1 shown in FIG. 8 is provided with a pair of left and right front wheels (drive wheels) 3 at a front portion of a vehicle body 2 and a pair of left and right rear wheels (redirect wheels) at a rear portion. 4 is provided, and a driver's seat 5 is provided in front of the vehicle body 2 and above. A mast 6 that is vertically expandable and contractible is attached to the front end of the vehicle body 2 via a front axle 7 in the vehicle width direction so as to be rotatable in the front-rear direction.
A tilt cylinder 8 that rotates back and forth is provided between the vehicle body 2 and the mast 6.

The mast 6 comprises a pair of left and right outer frames 9 on the forklift 1 side, and a pair of left and right inner frames 10 which are guided by the outer frame 9 and can move up and down.
0 is provided with a lift cylinder 11. In addition, a lift bracket 12 which is guided to the inner frame 10 side and can be moved up and down.
And a pair of left and right forks 1 is provided on the lift bracket 12 via a pair of upper and lower finger bars.
3 are provided.

[0005] The driver's seat 5 is provided with a seat 15 and a handle 16 positioned in front of the seat 15.
Above the head guard 19 is disposed a front pipe 17 and a rear pipe 18 erected from the main body 2 side. Further, a counterweight 20 is provided on the main body 2 behind the seat 15.

[0006]

However, in the above-described conventional forklift 1, since the left and right front wheels 3 are driven by a common traveling drive device, the front wheels 3 are steered so as to face right beside. Can't do it and cannot do traversing. Further, since the axle exists between the left and right front wheels 3 and between the left and right rear wheels 4, the battery B must be mounted so as to avoid these axles. Cannot be easily performed, and depending on the mounting state, the center of gravity may be higher and the stability may be deteriorated.

Therefore, the invention according to claim 1 of the present invention provides a traversing system in which a front wheel and a rear wheel can be steered so as to face right beside, and a battery can be easily attached and detached and stably mounted. It is an object of the present invention to provide a working vehicle having a vehicle.

[0008]

In order to achieve the above-mentioned object, a work vehicle having a traversing system according to claim 1 of the present invention comprises a vehicle body having a pair of left and right front wheels and a pair of right and left rear wheels. A pair of left and right front wheels are provided rotatably around a vertical axis with respect to the vehicle body, respectively, and a pair of front wheel rotating means for performing rotation is provided. A pair of left and right rear wheels are provided so as to be rotatable around the longitudinal axis with respect to the vehicle body, respectively, and a rear wheel rotating means for performing rotation is provided. A wide front portion that can move in the vehicle length direction between the two rear wheels in a straight running posture, and a narrow rear portion that can be positioned between the two rear wheels in a traversing posture. is there.

Therefore, according to the first aspect of the present invention, the right and left front wheels and the right and left rear wheels are oriented in the front-rear direction during normal traveling. Then, when switching from normal traveling to traversing traveling, for example, a lever-type traversing mode switch is operated to operate the front wheel rotating means and the rear wheel rotating means. That is, the front wheel turning means is operated, and the front wheel is turned around the vertical axis so as to be turned 90 degrees (right sideways) with respect to the vehicle body. Further, the rear wheel turning means is operated to turn the rear wheel around the vertical axis so as to turn the rear wheel in a 90-degree (right sideways) direction with respect to the vehicle body. After the front wheels and the rear wheels have been turned right and left in this way, the work vehicle can be traversed right and left.

The battery has a wide front portion movable in the vehicle length direction between the two rear wheels in the straight running posture.
It can be attached to and detached from the vehicle body from the rear of the vehicle body. In addition, the battery mounted on the vehicle body has a narrow rear portion located between the rear wheels, so that the rear wheels can be converted to the traversing posture without any trouble. It can be mounted on the lower part across.

According to a second aspect of the present invention, there is provided a working vehicle having a traversing system according to the first aspect, wherein a mast is provided at a front end side of the vehicle body.
The mast side is provided with a fork.

Therefore, according to the second aspect of the present invention, by operating the lift lever, the fork can be moved up and down along the mast, so that the intended fork operation can be performed.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. In the embodiment, the same components or almost the same components as those in the above-described conventional example (FIG. 8) are denoted by the same reference numerals, and the details are omitted.

That is, 1 is a forklift as an example of a work vehicle, 2 is a vehicle body, 3 is a front wheel (drive wheel), 4 is a rear wheel (redirect wheel), 5 is a driver's seat, 6 is a mast, and 8 is a tilt. Cylinder, 9 is an outer frame, 10 is an inner frame, 11 is a lift cylinder, 12 is a lift bracket, 13 is a fork,
15 is a seat, 16 is a handle, 17 is a front pipe,
Reference numeral 18 denotes a rear pipe, and 19 denotes a head guard. The mast 6 is attached to the vehicle body 2 via a connecting shaft 28 in the vehicle width direction so as to be rotatable in the front-rear direction.

The pair of left and right front wheels 3 are respectively provided so as to be able to turn 90 degrees (right sideways) with respect to the vehicle body 2. That is, the cylinder member 21 in the vertical direction is fixed to the vehicle body 2 side.
A pivot member 22 is provided rotatably about a longitudinal axis 23.

The turning member 22 comprises an upper T-shaped and case-shaped upper turning portion 22A and a C-shaped and case-shaped lower turning portion 22B. The upper portions of the portions 22B are connected and integrated. The upper portion of the upper turning portion 22A is inserted into the cylindrical member 21 and supported and guided by the bearing means 24, so that the turning member 22 is configured to be rotatable around the longitudinal axis 23.

At the lower end of the lower turning portion 22B, a lateral wheel shaft 25 is rotatably mounted via bearing means 26. The pair of left and right front wheels 3
A is attached to the outer end of the wheel axle 25 via a connector 27 so that the longitudinal axis 23
Are provided so as to be rotatable around. In this case, the front wheel 3 is configured to be located almost directly below the longitudinal axis 23.

The pair of left and right front wheels 3 is
In the turning range 3a. That is, (the vehicle body 2)
On the other hand, an electric motor (an example of a traveling drive unit) 30 is provided with its drive shaft 31 positioned downward at the longitudinal axis 23. On the side of the turning member 22, there is provided a rotation transmitting means 32 for interlocking the drive shaft 31 with the wheel shaft 25.

The rotation transmitting means 32 is provided on the upper turning part 22.
A high-order rotation axis 33 located in the axis A and on the vertical axis 23
And an interlocking member 34 for interlocking the upper end portion of the upper rotation shaft 33 with the drive shaft 31, a brake device 35 provided at the interlocking member 34, and a vertical device rotatably provided in the lower turning portion 22B. Direction lower rotation shaft 36, a reduction gear device 37 that links the lower end of the upper rotation shaft 33 to the upper end of the lower rotation shaft 36, and a bevel gear device 38 that links the lower end of the lower rotation shaft 36 to the inner end of the wheel shaft 25. One example is constituted by the above.

On the vehicle body 2 side, a front wheel turning means 40 for turning the turning member 22 is provided. That is, the front wheel rotating means 40 has a front wheel traversing cylinder 41, and the front wheel traversing cylinder 41 is
a is pivotally attached to the vehicle body 2 via a vertical pin 42, and a pinton rod 41 b is attached to a link 43 fixed to one of the revolving members 22 by a vertical connecting pin 4.
4 so as to be relatively rotatable. The arm 45 connected from the left and right turning members 22 is connected to each other via a link body 46 and a connecting pin 47 so as to be relatively rotatable.

Therefore, by turning the turning member 22 through the link 43 by the operation of the front-wheel traversing cylinder 41, the front wheel 3 on one side is turned around the longitudinal axis 23 and is turned sideways. At the same time, the front wheel 3 on the other side can be turned around the turning axis 23 and directed sideways via the arm 45 and the link body 46. In other words, according to the front wheel turning means 40, the left and right front wheels 3 are turned in opposite directions by the operation of the common front wheel traversing cylinder 41, and are directed to the side. The above 41 to 4
7 and the like constitute an example of the front wheel rotating means 40.

The pair of left and right rear wheels 4 are provided so as to be able to turn 90 degrees (right sideways) with respect to the vehicle body 2 respectively. That is, the rims 4A of the pair of left and right rear wheels 4 are freely rotatably attached to the vertical plate portions of the inverted L-shaped turning member 50 via the horizontal axle 51 and the like. The parts are a bearing 52 and a vertical axis 53
And is provided so as to be rotatable around the longitudinal axis 54 with respect to the vehicle body 2 side. At this time, the rear wheel 4 is configured to be located almost directly below the longitudinal axis 54.

A rear wheel turning means 60 for turning the pair of right and left rear wheels 4 around the longitudinal axis 54 is provided. The rear wheel turning means 60 includes a turning cylinder 61 and a rear wheel traversing cylinder 63. Consists of

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 rear-wheel traversing cylinders 63 are a pair of left and right, and their main bodies 63a are integrated (connected) to the main body 61a of the diverting cylinder 61 via a connecting member 64.
Have been. At this time, these rear wheel traverse cylinders 6
Piston rod 63c connected to the third piston 63b
Are projected outward in the vehicle width direction. The arm 65 connected to the upper end of the longitudinal axis 53 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. I have.

According to the rear wheel turning means 60, the operation of the turning cylinder 61 is performed by the fixed piston rod 61c.
The main body 61a of the rear wheel traversing cylinder 63 is moved in the vehicle width direction integrally with the main body 61a of the turning cylinder 61. At this time, a guide body (not shown) that penetrates the connecting member 64 is provided on the holding frame body 62 side, and the guide body guides the movement of the main bodies 61a and 63a and prevents rotation.

The turning cylinder 61 is operated by turning the handle 16 by an orbit roll (fully hydraulic power steering). The rear-wheel traversing cylinder 63 is provided in a pair of right and left directions so that the rear wheels 4 can be individually rotated by operating a control valve when the diverting cylinder 61 is in a neutral state. Is configured to be in a predetermined non-operating posture when is operated.

Therefore, by operating the rear wheel traversing cylinder 63, the vertical axis 53 is rotated through the link 66, the arm body 65, and the like, and the rear wheel 4 is rotated through the turning member 50 and the like. Can turn around and turn sideways. That is, the left and right rear wheels 4 are turned in the same direction by turning on the rear-wheel traversing cylinder 63, and are directed to the side. An example of the rear wheel turning means 60 for turning the pair of left and right rear wheels 4 around the vertical axis 54 is constituted by the above 61 to 68 and the like.

A battery 70 is mounted on the vehicle body 2 side. The battery 70 includes a wide front portion 70a movable in the vehicle length direction between the two rear wheels 4 in the straight running posture and a narrow rear portion 70b positioned between the two rear wheels 4 in the transverse running posture in plan view. In a T-shape. The rear side of the main body 2 is formed as a U-shaped battery storage section 2a when viewed from the rear. At this time, a notch 2b that allows the rear wheel 4 to rotate is provided at the rear end of the battery storage section 2a. Is formed.
Note that a detachable lid 2d is provided in the rear end opening 2c of the battery storage 2a.

Therefore, in a state where the rear wheels 4 are in the straight running posture and the lid 2d is detached, the battery 70 can be attached and detached from the rear of the vehicle body in the vehicle length direction. It can be moved between the rear wheels 4 without any trouble. When the battery 70 is mounted,
The narrow rear portion 70b is located between the rear wheels 4, so that the rear wheels 4 can be converted to the traversing posture without any trouble.

The battery 70 is provided with a controller 71. Cables (power source supply parts) 72 from the controller 71 are connected to the electric motors 30 respectively. In this case, the cable 72 can be simply and efficiently arranged regardless of the turning member 22 side. The rear wheel turning means 60 is disposed so as to be located above the battery 70.

The operation of the above embodiment will be described below. FIG. 1A, FIGS. 2, 3, 6, and 7
, And FIGS. 4 and 5 show normal traveling. At this time, the left and right front wheels 3 and the left and right rear wheels 4 are oriented in the front-rear direction. Such a forklift 1
Means that the worker sitting on the seat 15 of the driver's seat 5
By maneuvering, the vehicle can move. That is, after the electric power of the battery 70 is controlled by the controller 71, the electric power is supplied to the electric motor 30 via the cable 72, and the electric motor 30 is driven to drive the front wheel 3 via the rotation transmitting means 32 or the like. By driving the forklift 1 forward and backward, the forklift 1 can travel back and forth.

At this time, the drive shaft 3 of the electric motor 30
One rotation can be transmitted to the front wheel 3 via the interlocking member 34, the upper rotation shaft 33, the reduction gear device 37, the lower rotation shaft 36, the bevel gear device 38, and the wheel shaft 25. In addition, it can stop suitably by operating the brake device 35.

By operating the lift cylinder 11 by operating the lift lever, the lift bracket 1
The fork 13 can be moved up and down along the mast 6 through, for example, the mast 6, so that the intended fork operation can be performed. By operating the tilt lever to operate the tilt cylinder 8, the mast 6 is rotated (tilted) around the connection shaft 28.
Thus, the posture of the fork 13 can be changed via the lift bracket 12 or the like.

During the above-mentioned running movement, the vehicle is turned in accordance with the operation of the steering wheel 16. That is, for example, handle 1
By turning 6 to the left, the body 6 of the turning cylinder 61 is turned.
1a is operated to the left by the orbit roll, and the main body 63a of the cylinder 63 for traversing both rear wheels 63 through the connecting member 64.
Are moved together to the left. At this time, the two rear wheel traversing cylinders 63 are in a non-operating position at a predetermined contraction limit and serve as a link. Therefore, the leftward movement of the two rear wheel traversing cylinders 63 is transmitted to the arm body 65 via the link 66, thereby rotating the turning member 50 about the longitudinal axis 54 and replacing the rear wheel 4. You can turn to the left.

Also, the main body 61a of the turning cylinder 61
When the vehicle is actuated to the left to the limit, the left and right rear wheels 4 can be turned in an inverted C-shape, thereby enabling a turn on the spot. In the same manner as described above, for example, by turning the handle 16 to the right, the vehicle can turn right.

When switching from such normal running to traversing running, the turning cylinder 61 is first set to the neutral (straight) position shown in FIG. In this state, for example, a lever-type transverse mode switch (not shown) is operated to operate the front wheel turning means 40 and the rear wheel turning means 60.

That is, in the front wheel turning means 30, the turning cylinder 41 is operated by operating the lever type traversing mode switch and tilting the lever to turn the turning member 22 around the longitudinal axis 23 through the link 43. As a result, the front wheels 3 are turned 90 degrees (right sideways) with respect to the vehicle body 2 as shown by phantom lines in FIG. 1B and FIGS. 2 and 3.

At this time, the electric motor 30 is provided on the vehicle body 2 side, and the electric motor 30 is free and the brake device 35 is opened to move the front wheel 3 via the turning member 22. The 90-degree turning can be performed lightly, easily and smoothly. Further, since the front wheel 3 is located almost directly below the turning axis 23, the front wheel 3
And so on can be turned 90 degrees in a compact form.

In the rear wheel turning means 60, the rear valve traversing cylinders 63 are contracted and moved by the control valve, and the retreating movement of the piston rod 63 c is transmitted to the arm 65 via the link 66, and the turning member 50 is moved. To the vertical axis 5
4 and thus, FIG. 1 (b), FIGS.
As shown by the phantom line in FIG.
It is turned to a degree (horizontal).

When the front wheels 3 and the rear wheels 4 are turned in this way, that is, when the front wheels 3 and the rear wheels 4 are turned right and left by the sensor, the indicator lamp is turned on. , Which allows a traversing mode.

Therefore, the forklift 1 is mounted on the driver's seat 5
By operating the handle 16 by the operator sitting on the seat 15, the electric power of the battery 70 is controlled by the controller 71 and then supplied to the electric motor 30 via the cable 72 in the same manner as described above. Electric motor 3
By driving 0, the front wheel 3 is driven and rotated in the forward and reverse directions via the rotation transmitting means 32 and the like, so that the forklift 1 can be traversed right and left. At that time, a pair of left and right rear wheels 4
Is rotated following.

By being able to perform traversing in this way,
For example, a long object can be easily transported via the fork 13. Correction of the straightness in the traversing can be easily performed by tilting the lever back and forth to finely operate the front wheel traversing cylinder 41 and finely adjust the angle of the front wheel 3.

In the forklift 1 as described above, the battery 70 can be attached to and detached from the battery storage 2a because the wide front portion 70a can be moved between the rear wheels 4 in the straight running posture without any trouble in the vehicle length direction. Can be easily and quickly performed from the rear of the vehicle body, which facilitates maintenance. The battery 70 mounted on the battery storage 2a
Since the narrow rear portion 70b is located between the rear wheels 4, the rear wheels 4 can be converted to the traversing running posture without any trouble. Since the large forklift 1 can be installed over the lower part of the vehicle body 2, the center of gravity is lowered and the forklift 1 is stable.
And

In each of the above-described embodiments, the counter-type forklift 1 is shown as a work vehicle, but the work vehicle may be a large-sized transport vehicle, a loader, a side forklift, or the like. Things.

According to the above-described embodiment, since the pair of left and right front wheels 3 are linked to the vertical electric motors 30 accommodated in the turning range 3a of the front wheels 3, respectively, the overall size is reduced. At the same time, the cable 72 can be arranged on the electric motor 30 fixed to the main body 2 irrespective of the turning member 22 side, and thus can be simply and efficiently arranged.

However, the electric motor 30 is attached to the turning member 22 and the rim 3 of the front wheel 3 is attached to the lateral drive shaft 31.
A may be in a form of interlocking connection. In this case,
When the front wheel 3 is turned 90 degrees with respect to the vehicle body 2,
Since each of the front wheels 3 is integrated with the electric motor 30, the turning can be easily and smoothly performed.

In the above-described embodiment, the type in which the common front wheel rotating means 40 for simultaneously rotating the pair of left and right front wheels 3 is provided. May be individually rotated by the front wheel rotating means.

In the above-described embodiment, the type in which the common rear wheel rotating means 60 for simultaneously rotating the pair of right and left rear wheels 4 is provided. Alternatively, one rear wheel 4 may be a steering wheel type using a steering wheel, and the other rear wheel 4 may be a turning caster type. In this case, when switching to traverse traveling, one rear wheel 4 is forcibly turned by a cylinder or the like. Let it.

[0050]

According to the first aspect of the present invention, the front wheel turning means is operated when the left and right front wheels and the left and right rear wheels are switched from the normal traveling in which the front and rear directions are directed to the transverse traveling. Thus, the front wheels can be turned around the vertical axis so as to be turned in a 90-degree shape (right sideways) with respect to the vehicle body,
Further, by operating the rear wheel turning means, the rear wheel can be turned around the vertical axis to be turned 90 degrees (right sideways) with respect to the vehicle body, so that the work vehicle can travel sideways on the left and right. .

The wide front part of the battery can be moved between the rear wheels in the straight running posture without any trouble in the vehicle length direction. Maintenance can be easily performed. In addition, the battery mounted on the vehicle body has a narrow rear portion located between both rear wheels, so that the two rear wheels can be converted to the traversing posture without any trouble, and from the middle part of the vehicle body A large one can be mounted at the lower part over the rear end, so that the center of gravity is lowered and a stable work vehicle can be provided.

According to the second aspect of the present invention,
During normal running, the left and right front wheels and the left and right rear wheels are oriented in the front-rear direction, and by operating the lift lever, the fork can be raised and lowered along the mast to perform the intended fork work. it can. In this way, the fork work can be performed in a normal manner, but the drive-type front wheel can be steered so as to be directed sideways to perform traversing travel.For example, transport of a long object can be performed via a fork. It can be done easily.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, and is a schematic plan view of a working vehicle having a traversing system.
(B) is a time of traversing.

FIG. 2 is a side view of the work vehicle having the traversing system during normal running.

FIG. 3 is a partially cutaway front view of a front wheel portion of the work vehicle having the traversing system.

FIG. 4 is a partially cutaway side view of a front wheel portion of the work vehicle having the traversing system.

FIG. 5 is a plan view of a front wheel portion of a work vehicle having the traversing system.

FIG. 6 is a rear view of a rear wheel portion of the work vehicle having the traversing system.

FIG. 7 is a plan view of a rear wheel portion of the work vehicle having the traversing system.

FIG. 8 is a side view of a forklift, showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Forklift (work vehicle) 2 Body 2a Battery storage part 2b Notch part 2c Rear end opening part 2d Lid 3 Front wheel 4 Rear wheel 5 Driver's seat 6 Mast 12 Lift bracket 13 Fork 15 Seat 16 Handle 20 Counterweight 22 Revolving member Reference Signs List 23 longitudinal axis 25 wheel shaft 30 electric motor (traveling driving means) 31 drive shaft 32 rotation transmitting means 40 front wheel rotating means 41 front wheel traversing cylinder 43 link 45 arm 46 link body 50 turning member 51 axle 54 longitudinal axis 60 rear Wheel turning means 61 Cylinder for turning 63 Cylinder for rear wheel traversing 65 Arm body 66 Link 70 Battery 70a Wide front part 70b Narrow rear part 71 Controller 72 Cable

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[Procedure amendment]

[Submission date] July 9, 2001 (2001.7.9)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0036

[Correction method] Change

[Correction contents]

Further , the cylinders 63 for traversing both rear wheels are disposed halfway.
When contracted to the maximum, the left and right rear wheels 4 can be turned in a reverse C-shape, thereby enabling a turn on the spot.
In the same manner as described above, for example, by turning the handle 16 to the right, the vehicle can turn right.

Claims (2)

[Claims] 1. A pair of left and right front wheels and a pair of left and right rear wheels are provided on a vehicle body so as to be able to turn 90 degrees, respectively. Along with being provided rotatably around, a front wheel rotating means for performing rotation is provided, and a pair of left and right rear wheels are provided rotatably around a vertical axis with respect to the vehicle body side, respectively. A rear wheel turning means for turning is provided, and a battery mountable on the vehicle body is provided between a wide front portion movable in the vehicle length direction between both rear wheels in a straight running posture and a rear wheel in a transverse running posture. A work vehicle having a traversing system, comprising: 2. The work vehicle having a traversing system according to claim 1, wherein a mast is provided on a front end side of the vehicle body, and a fork is provided on the mast side.