JP3272339B2 - Forklift with traversing system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[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, the conventional forklift 1 shown in FIG. 9 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 4 at a rear portion. The driver's seat 5 at the front of the body 2
Is provided. At the front end of the vehicle body 2, a mast 6 that can expand and contract in the vertical direction is attached via a connecting shaft 7 in the vehicle width direction so as to be rotatable in the front-rear direction, and a tilt cylinder 8 that rotates back and forth is provided. It 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 that is guided by the inner frame 10 and that can move up and down is provided.
A pair of left and right forks 13 is provided via a pair of upper and lower finger bars.

[0005] The driver's seat 5 is provided with a seat 15 and a handle 16 positioned in front of the seat 15.
A head guard 19 is disposed above the head guard 19 via 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.

Therefore, the invention according to claim 1 of the present invention provides a forklift having a traversing system which can steer a drive-type front wheel so as to face right besides, while having a form capable of normal fork work. It is intended for that purpose.

[0008]

In order to achieve the above-mentioned object, a forklift having a traversing system according to claim 1 of the present invention comprises a vehicle body comprising a pair of left and right front wheels and a pair of left and right rear wheels. Each of the pair of left and right front wheels is interlockingly connected to a drive shaft on the traveling drive device side, and both traveling drive devices rotate around the vertical axis with respect to the vehicle body side. sideways with attached at the vertical plate portion definitive reversed L-shaped pivot member which is disposed for free movement, rotation device for causing the rotation of the pivot member is provided, the mast is provided at the front side of the vehicle body together is, this is the mast side fork is provided, the left relative to the vehicle body
In traversing traveling with the right pair of front wheels turned 90 degrees
To correct straightness, tilt the lever back and forth to fine
Activate to fine-tune the angle of the front wheels
It is characterized by having been constituted in .

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. By operating the lift lever, the fork can be moved up and down along the mast, and the intended fork operation can be performed. When switching from normal running to traversing running, first, the turning device is operated to turn the turning member about the vertical axis, and the front wheel is moved relative to the vehicle body.
It turns to 0 degrees (turns straight to the side). Here, since the front wheels are respectively integrated with the traveling drive device, the 90-degree turning can be easily and smoothly performed. After the front wheels have been turned right and left in this manner, the forklift can be traversed right and left by driving the front wheels in the forward and reverse directions by the traveling drive device. At that time, the rear wheels are turned in a following manner in the form of a swivel caster, or forcibly changed in the same manner as the front wheels. Also, a pair of left and right front wheels
Correction of straightness in traversing running 90 degrees
Tilt the lever back and forth to finely actuate the rotating device,
This can be done by fine-tuning the angle of the wheel .

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. Note that, in the first embodiment, the same components or almost the same components as those in the above-described conventional example (FIG. 9) are denoted by the same reference numerals, and the details are omitted. That is, 1 is a forklift,
2 is a vehicle body, 3 is a front wheel, 4 is a rear wheel, 5 is a driver's seat, 6 is a mast, 7 is a connecting shaft, 8 is a tilt cylinder, 9 is an outer frame, 10 is an inner frame, 11 is a lift cylinder, 12 is Lift bracket, 13 is a fork, 15 is a seat, 16 is a handle, 17 is a front pipe, 18 is a rear pipe, 1
Reference numeral 9 denotes a head guard, and reference numeral 20 denotes a counterweight.

A pair of left and right front wheels 3 and a pair of right and left rear wheels 4
Are provided so as to be able to turn 90 degrees to the vehicle body 2 (to turn right and left). That is, the pair of left and right front wheels 3 is mounted on the rotary flange (an example of a driving shaft) 22 of a hydraulic motor (an example of a driving device) 21 directly via a connecting member 23 so that the rim 3A is hydraulically driven. It is linked to the motor 21 side.

The mount of the hydraulic motor 21 is mounted laterally on a vertical plate portion of the inverted L-shaped turning member 24, and the horizontal plate portion of the turning member 24 is connected via a bearing 25 and a vertical axis 26. , The longitudinal axis 2 with respect to the body 2 side
7 is provided rotatably. At this time, the longitudinal axis 27 is configured to be located directly above the front wheel 3. The left and right turning members 24 are connected by a link 28 and the like, and are turned by a common turning cylinder (turning device) 29, so that the left and right front wheels 3 turn in opposite directions to be right and left. It is configured to face the shape.

An engine 30 is provided on the vehicle body 2 side, and a pair of pumps 31 driven by the engine 30 are provided. Then, the pump 31 is made to correspond to one hydraulic motor 21, that is, a two-pump two-motor type hydraulic drive system (H
The corresponding pump 31 and the hydraulic motor 21 are connected via a pipe (eg, a hydraulic hose) 32 so as to form an ST system.

The rims 4A of the pair of left and right rear wheels 4 are freely rotatably mounted on the vertical plate portions of the turning member 34, and the horizontal plate portions of the turning member 34 are connected via bearings 35 and longitudinal axes 36. And the longitudinal axis 3
7 is provided rotatably. At this time, the longitudinal axis 37 is configured to be located directly above the rear wheel 4. In other words, the pair of left and right rear wheels 4 are configured to follow in a turning caster type.

The operation of the first embodiment will be described below. 1 and 2 and FIG. 3 show a normal running state. 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 can travel when an operator sitting on the seat 15 of the driver's seat 5 operates the handle 16.

By operating the lift lever to operate the lift cylinder 11, the lift bracket 12
The fork 13 can be moved up and down along the mast 6 through the like, and the intended fork operation can be performed. The mast 6 can be rotated (tilted) around the connecting shaft 7 by operating the tilt lever 8 by operating the tilt lever, and thus the fork 1 can be rotated via the lift bracket 12 or the like.
3 can be changed.

When switching from the normal traveling to the traversing traveling, first, a lever type traversing mode switch (not shown) is operated, and the turning cylinder 29 is operated by inclining the lever. Revolving member 2
4 is rotated about the vertical axis 27, and as shown in the imaginary lines in FIGS. 1 and 2 and FIG. (Converted to).

Here, the front wheels 3 are
Since it is integrated with the front wheel 3, the 90-degree turning can be easily and smoothly performed, and the longitudinal axis 27 is located directly above the front wheel 3, so that the front wheel 3 and the like are compact. A 90-degree turning can be performed.

In this way, the sensor detects that the front wheel 3 has been turned, that is, that the front wheel 3 has been turned to the side, and turns on the indicator lamp, thereby enabling the traversing mode. Become. Therefore, engine 3
By supplying hydraulic pressure from a pair of pumps 31 driven by the hydraulic motor 21 to the corresponding hydraulic motor 21 via a pipe 32 by forward / reverse control in the driver's seat 5, the front wheels 3
Can be driven in the opposite direction, so that the forklift 1 can be traversed right and left. At this time, a pair of left and right rear wheels 4 of a swivel caster type are followed.

By being able to perform traversing in this way,
For example, a long object can be easily transported via the fork 13. The correction of straightness in traversing can be easily performed by tilting the lever forward and backward to finely operate the turning cylinder 29 and finely adjusting the angle of the front wheel 3.

The driving format of the forklift 1 is as follows.
By adopting the two-pump two-motor type hydraulic drive system, the turning in the normal running described above is performed by turning the front wheel 3 in the direction of rotation and the difference in the number of rotations. The turning system is electrically stopped.

Next, a second embodiment of the present invention will be described with reference to FIGS.
A description will be given based on FIG. In the second embodiment, the same components or substantially the same components as those in the above-described first embodiment (FIGS. 1 to 4) are denoted by the same reference numerals, and the details are omitted. .

The pair of left and right front wheels 3 are electrically mounted by connecting the rims 3A thereof directly to the rotating flanges (drive shafts) 42 of the electric motors (another example of the traveling drive device) 41 via the connecting members 23. It is linked to the motor 41 side. A battery 43 is mounted on the vehicle body 2 side, and a controller 44 is attached to the battery 43. And the cable 4 from the controller 44
5 are connected to the electric motor 41, respectively.

The operation of the second embodiment will be described below. The solid lines in FIGS. 5 and 6 and FIG. 7 show a normal running state. 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. Accordingly, the electric power of the battery 43 is controlled by the controller 44 and then supplied to the electric motor 41 via the cable 45, thereby driving the front wheels 3 in the forward and reverse directions, so that the forklift 1 can travel back and forth.

When switching from such normal running to traversing running, as shown in the phantom lines in FIGS. 5 and 6 and FIG. 8, the front wheels 3 are turned 90 degrees to the vehicle body 2 ( (Turned straight sideways). Here, since the front wheels 3 are each integrated with the electric motor 41, the 90-degree turning can be easily and smoothly performed.

In this way, the sensor detects that the front wheel 3 has been turned, and turns on the indicator lamp, thereby enabling the traversing mode. Accordingly, by supplying the electric power of the battery 43 to the electric motor 41 via the cable 45 after being controlled by the controller 44, the front wheels 3 can be driven in the forward and reverse directions, and the forklift 1 can be traversed right and left.

In both of the above-described embodiments, the pair of right and left rear wheels 4 employs a swivel caster type in which a follow-up turning direction is adopted. A converted form may be adopted. Also, of the pair of right and left rear wheels 4, one rear wheel 4
The steering wheel with steering wheel, the other rear wheel 4
May be a turning caster type. In this case, when switching to traversing traveling, one rear wheel 4 is forcibly turned by a cylinder or the like.

[0028]

According to the first aspect of the present invention, the left and right front wheels and the left and right rear wheels are oriented in the front-rear direction during normal traveling, and the fork is moved by operating the lift lever. The fork work can be performed by moving the fork up and down. When switching from normal running to traversing running, the turning device is first operated to turn the turning member around the vertical axis so that the front wheels are turned 90 degrees with respect to the vehicle body (right sideways). Can be converted). Here, since the front wheels are each integrated with the traveling drive device, the 90-degree turning can be easily and smoothly performed. After turning the front wheels in the horizontal direction in this way, the forklift can be traversed right and left by driving the front wheels in the forward and reverse directions by the traveling drive device, in which case the rear wheels follow the turning caster type. The vehicle can be turned or forcibly turned in the same way as the front wheels.

As described above, according to the present invention, while the conventional fork operation is possible, the drive-type front wheel can be steered so as to be directed sideways to perform traversing travel. Transfer can be easily performed via a fork. In addition, the pair of left and right front wheels is
Correction of straightness in traversing the vehicle turning to the right
Tilt the bar back and forth to finely actuate the pivoting device and adjust the corners of the front wheels.
It can be easily performed by finely adjusting the degree.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the present invention, and is a side view of a forklift having a traversing system during normal traveling.

FIG. 2 is a partially cutaway front view of a front wheel portion of the forklift having the traversing system.

FIG. 3 is a schematic plan view of the forklift having the traversing system during normal traveling.

FIG. 4 is a schematic plan view of the forklift having the traversing system during traversing travel.

FIG. 5 is a side view of the forklift having the traversing system during normal running, showing the second embodiment of the present invention.

FIG. 6 is a partially cutaway front view of a front wheel portion of the forklift having the traversing system.

FIG. 7 is a schematic plan view of the forklift having the traversing system during normal traveling.

FIG. 8 is a schematic plan view of the forklift having the traversing system during traversing travel.

FIG. 9 shows a conventional example and is a side view of a forklift.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Forklift 2 Body 3 Front wheel 3A rim 4 Rear wheel 4A rim 5 Driver's seat 6 Mast 13 Fork 16 Handle 20 Counterweight 21 Hydraulic motor (travel drive) 22 Rotating flange (drive shaft) 24 Rotating member 25 Bearing 26 Vertical axis 27 Vertical axis 29 Revolving cylinder (rotating device) 30 Engine 31 Pump 34 Revolving member 35 Bearing 36 Vertical axis 37 Vertical axis 41 Electric motor (traveling drive) 42 Rotating flange (drive shaft) 43 Battery 44 Controller 45 Cable

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B66F 9/075 B62D 7/14

Claims (1)

(57) [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, and the pair of left and right front wheels are respectively linked to a drive shaft on a traveling drive device side. The two traveling drive devices are connected to an inverted L-shaped turning member provided rotatably around the longitudinal axis with respect to the vehicle body side.
Definitive with attached sideways to the vertical plate portion, rotating device for causing the rotation of the pivot member is provided, along with the mast is provided at the front side of the vehicle body, the fork is provided on the mast side, the Left and right pair with the body
In traversing with the front wheels turned 90 degrees
To correct the gender, tilt the lever back and forth to
To adjust the angle of the front wheels.
Forklift with a rampant system, characterized in that it was.