JP2016147563A - Caster wheel and work vehicle provided with the caster wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a caster wheel capable of preventing horizontal shaking of a movable body when the direction of travel of the movable body is reversed, and a work vehicle provided with the caster wheel.SOLUTION: In the caster wheel in which the rotary shaft position Q2 of a wheel 22 is offset with respect to a caster arm 21 in a horizontal direction, the rotary shaft position Q2 of the wheel 22 is offset with respect to the shaft center Q1 of the caster arm 21 in a horizontal direction, a shaft leg 23 offset against the rotary shaft position Q2 of the wheel with respect to the caster arm 21 is provided, and the shaft leg 23 is attached to a vehicle body frame 11 on a follower wheel 2 side of a work vehicle 1 in a freely rotatable manner through a bearing 24. An offset amount W1 between the rotary shaft position Q2 of the wheel 22 and the shaft center Q1 of the caster arm 21 and an offset amount W2 between the shaft center Q1 of the caster arm and a shaft center Q3 of the shaft leg 23 are set to the same level.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a caster wheel and a work vehicle including the caster wheel.

  Conventionally, a caster wheel used for a wheel of a moving body such as a work vehicle or a carriage has a configuration in which a rotation axis position of the wheel is offset in a horizontal direction with respect to a caster arm that is rotatably attached to the moving body. The wheel is adapted to turn around the caster arm in accordance with the traveling direction of the moving body (see, for example, Patent Document 1).

JP 2012-35774 A

  However, in the conventional caster wheel, the rotational axis position of the wheel is offset in the horizontal direction with respect to the caster arm, so when the traveling direction of the moving body is reversed, the wheel receives frictional resistance with the road surface. There is a problem that the caster arm side rotates around the rotational axis position of the wheel, and this causes the moving body to sway each time the traveling direction is changed.

  The problem to be solved by the present invention is to provide a caster wheel that can prevent lateral movement of the moving body when the traveling direction of the moving body is reversed, and a work vehicle equipped with the caster wheel. .

In order to solve the above-mentioned problem, the caster wheel according to claim 1 is a caster wheel in which the rotational axis position of the wheel is offset in the horizontal direction with respect to the caster arm.
A shaft leg that is offset from the rotation axis position of the wheel with respect to the caster arm is provided, and the shaft leg can be rotatably attached to a moving body.

The caster wheel according to claim 2 is the caster wheel according to claim 1,
The offset amount between the rotation axis position of the wheel and the caster arm and the offset amount between the caster arm and the shaft leg are the same.

The caster wheel according to claim 3 is the caster wheel according to claim 1 or 2,
The wheel has two wheels.

A work vehicle comprising a caster wheel according to claim 4 comprises driven wheels, two drive wheels, a driver's seat, forward / reverse switching means, and steering means.
As the driven wheel, there is used a caster wheel having a shaft leg in which a rotational axis position of a wheel is offset in a horizontal direction with respect to a caster arm, and a shaft leg offset from the rotational axis position of the wheel with respect to the caster arm. The leg is attached to the work vehicle so as to be rotatable.

A work vehicle comprising the caster wheel according to claim 5 is a work vehicle comprising the caster wheel according to claim 4,
Both the drive wheels are driven by independent electric motors,
The steering means is configured to be steered by a rotational difference between the two electric motors.

A work vehicle including the caster wheel according to claim 6 is a work vehicle including the caster wheel according to claim 4 or 5,
The driver seat is configured to be reversible in the forward / backward direction of the work wheel.

A work vehicle including the caster wheel according to claim 7, wherein the work vehicle includes the caster wheel according to claim 6,
By inserting a lock pin provided on the rotating shaft support portion of the driver's seat into an engagement hole provided in the vehicle body frame of the work wheel, the direction of the driver's seat can be locked in the forward and backward directions in the forward and backward traveling directions. The means is characterized by being configured.

A work vehicle including the caster wheel according to claim 8, wherein the work vehicle includes the caster wheel according to claim 7.
The lock pin is configured so that the engagement state with the engagement hole is maintained by an inactive force of the spring, and the lock pin can be released by stepping on a stepping type unlocking pedal.

The work vehicle provided with the caster wheel according to claim 9 is the work vehicle provided with the caster wheel according to any one of claims 4 to 8,
One operating lever for operating the forward / reverse switching means and the steering means is provided in front of the driver's seat, and the traveling direction is switched and traveled by tilting the operating lever back and forth from the neutral position. The speed is adjusted, and the steering is performed by adjusting the rotational difference between the two electric motors by rotating in the left-right direction.

A work vehicle equipped with the caster wheel according to claim 10 is a work vehicle equipped with the caster wheel according to claim 9,
The operation lever is configured to always return to the neutral position when there is no operation.

In the caster wheel according to claim 1, as described above, the caster arm is provided with a shaft leg that is offset from the rotation shaft position of the wheel, and the shaft leg can be rotatably attached to the moving body. When the traveling direction of the moving body changes, the position of the caster arm first moves in a direction intersecting the moving direction of the moving body due to frictional resistance with the road surface received by the wheel, and the wheel rotates around the rotational axis position. When the wheel rotates 90 degrees, the axle leg moves to the rotational axis position of the wheel, then the axle leg further moves in the traveling direction of the moving body, and when the wheel rotates 180 degrees, the position of the caster arm becomes the axis leg. It moves to a position that overlaps the line that connects the rotational axis positions of the wheels, thereby completing the turn of the caster wheel without causing the axle legs to sway.
Therefore, it is possible to obtain the effect that the lateral movement of the moving body when the traveling direction of the moving body is reversed can be minimized.

  In the caster wheel according to claim 2, as described above, by making the offset amount between the rotation axis position of the wheel and the caster arm and the offset amount between the caster arm and the shaft leg equal, the traveling direction of the moving body It becomes possible to almost completely prevent the lateral movement of the moving body when the is reversed.

  In the caster wheel according to claim 3, since the frictional resistance between the wheel and the road surface is increased by using two wheels of the caster wheel as described above, the traveling direction of the moving body is reversed. It is possible to enhance the effect of preventing the moving body from shaking.

  The work vehicle including the caster wheel according to claim 4 includes the driven wheel, the plurality of driving wheels, the driver's seat, the forward / reverse switching means, and the steering means, as described above, The caster wheel with a shaft leg that is offset in the horizontal direction with respect to the arm, and a wheel leg that is offset from the wheel rotation axis position with respect to the caster arm is used so that the shaft leg can be rotated relative to the work vehicle. By adopting the attached configuration, it is possible to obtain an effect that the direction can be changed without side-shocking even in a narrow warehouse or the like.

  In the work vehicle provided with the caster wheel according to claim 5, as described above, both drive wheels are driven by independent electric motors, and the steering means is configured to be steered by the rotational difference between the two electric motors. As a result, the turning radius of the work vehicle can be minimized.

  In the work vehicle equipped with the caster wheel according to claim 6, as described above, the driver's seat is configured to be reversible in the forward / reverse direction of the work wheel, so that the work vehicle is always in the traveling direction even in a place where turning is impossible. It will be possible to drive and work operations.

  In the work vehicle equipped with the caster wheel according to claim 7, as described above, by inserting the lock pin provided in the rotating shaft support portion of the driver's seat into the engagement hole provided in the vehicle body frame of the work wheel, Since the direction of the driver's seat can be locked in the forward direction and the reverse direction in the forward direction, the lock and release can be performed with a simple structure.

  The work vehicle including the caster wheel according to claim 8 is configured such that the lock pin is maintained in an engagement state with the engagement hole by an inactive force of the spring and can be released by depressing a stepping type unlocking pedal. As a result, the lock and release operations can be quickly performed only by the stepping operation.

  In the work vehicle provided with the caster wheel according to claim 9, as described above, one operating lever for operating the forward / reverse switching means and the steering means is provided in front of the driver's seat, The lever is tilted back and forth from the neutral position to switch the direction of travel and adjust the travel speed, and by rotating it to the left and right, the rotation difference between the two electric motors is adjusted to perform steering. Because it is configured, it is possible to adjust the traveling speed, switch the direction of travel, and steer with only one hand operation of one control lever, and simultaneously perform other operations such as raising and lowering the forklift with the other hand. Will be able to.

  In the work vehicle provided with the caster wheel according to claim 10, as described above, the operation lever is configured to always return to the neutral position when no operation is performed. It will be possible to prevent runaway.

1 is a front view illustrating a work vehicle to which a caster wheel according to a first embodiment is applied. It is a rear view which shows the work vehicle to which the caster wheel of Example 1 is applied. It is a top view which shows the work vehicle to which the caster wheel of Example 1 is applied. It is a left view which shows the work vehicle to which the caster wheel of Example 1 is applied. It is a left view which shows the state which reversed the driver's seat which shows the work vehicle to which the caster wheel of Example 1 is applied. It is a perspective view from the back which shows the caster wheel of Example 1. FIG. It is a rear view which shows the caster wheel of Example 1. FIG. 1 is a longitudinal sectional view of a vehicle body center in a state of being attached to a vehicle body frame showing a caster wheel of Embodiment 1. FIG. FIG. 3 is a plan view illustrating a driver seat locking mechanism according to the first embodiment. FIG. 3 is an enlarged plan view of a main part illustrating a driver seat locking mechanism according to the first embodiment. It is a rear view which shows the locking mechanism of the driver's seat in Example 1. FIG. FIG. 3 is an enlarged rear view of a main part showing a driver seat locking mechanism in the first embodiment. FIG. 3 is a plan view illustrating details of an operation lever portion in the first embodiment. FIG. 3 is a front view illustrating details of an operation lever portion in the first embodiment. FIG. 6 is a rear view illustrating details of an operation lever portion in the first embodiment. FIG. 6 is a left side view illustrating details of an operation lever portion in the first embodiment. FIG. 3 is a perspective view illustrating details of an operation lever portion in the first embodiment. FIG. 6 is an explanatory diagram of the operation of the caster wheel according to the first embodiment.

  Embodiments of the present invention will be described below with reference to the drawings.

  The caster wheel of the first embodiment is an example applied to a driven wheel of a work vehicle. As shown in FIGS. 1 to 4, the work vehicle 1 includes a driven wheel 2 constituted by a caster wheel, Two drive wheels 3, 3, a driver's seat 4, forward / reverse switching means 5, steering means 6, and forklift device 7 are provided as main components.

More specifically, the driven wheel 2 is constituted by the caster wheel of the present invention.
As shown in FIGS. 6 to 8, this caster wheel has a rotational axis position Q2 of the wheel 22 that is offset in the horizontal direction with respect to the axis Q1 of the caster arm 21, and a rotational axis position Q2 of the wheel relative to the caster arm 21. Is provided with an offset shaft leg 23, and the shaft leg 23 is rotatably attached to the body frame 11 on the driven wheel 2 side of the work vehicle 1 via a bearing 24.

Further, the wheel 22 is rotatably attached to the caster arm 21 via a bearing 25.
In the first embodiment, the wheel 22 is composed of two wheels.

  Further, as shown in FIG. 8, the offset amount W1 between the rotational axis position Q2 of the wheel 22 and the axis Q1 of the caster arm 21, and the offset amount between the axis Q1 of the caster arm and the axis Q3 of the shaft leg 23. W2 is set to be the same.

  Returning to FIGS. 1 to 4, the drive wheels 3 and 3 are driven by independent electric motors 31 and 31, respectively, and the steering means 6 is configured to be steered by the rotational difference between the electric motors 31 and 31. Has been.

The driver's seat 4 is configured to be reversible from the forward movement state shown in FIG. 4 to the reverse movement state shown in FIG. 5 by pivotally supporting the substantially central portion thereof with respect to the vehicle body frame 11.
Further, as shown in FIGS. 9 to 12, by inserting the lock pin 42 provided in the rotating shaft support 41 of the driver's seat 4 into the engagement hole 12 provided in the vehicle body frame 11, the driver's seat 4 in the front and rear traveling directions. Can be locked in the forward and reverse directions.
Further, the lock pin 42 is maintained in the engagement state with the engagement hole 12 due to the inactive force of the spring 43, and can be released by stepping on a foot-operated lock release pedal 44.

In addition, an operation lever 8 for operating the forward / reverse switching unit 5 and the steering unit 6 is provided in front of the driver seat 4.
As shown in FIGS. 13 to 17, the operation lever 8 is tilted in the front-rear direction from the neutral position, and this movement is input to the two potentiometers A and B through the link mechanisms 10 and 10. The traveling direction is switched and the traveling speed is adjusted. By rotating in the left and right direction, the two potentiometers A and B are input to the two potentiometers A and B through the left and right link mechanisms 10 and 10. The steering is performed by adjusting the rotation difference between the two.

  That is, since the input directions of the potentiometers A and B are the same when the operation lever 8 is moved forward and backward, the left and right electric motors 31 and 31 rotate in the same direction and the work vehicle 1 goes straight. When the operation lever 8 is rotated in the left-right direction, the input directions of the potentiometers A and B are reversed, so that the left and right electric motors 31 and 31 rotate in opposite directions and the work vehicle 1 turns.

As shown in FIG. 4, the operation lever 8 is configured to always return to the neutral position when there is no operation due to the ineffective force of the spring 81.
A simple seat 45 made of a pipe is provided behind the driver's seat 4.

  The forklift device 7 is provided on the drive wheels 3 and 3 side of the work wheel 1 and operates a lift raising / lowering switch 71 provided on the operation lever 8 to drive a hydraulic cylinder 72, via a link mechanism 73. The raising / lowering operation of the fork 74 is performed.

  In the figure, reference numeral 9 denotes a battery for driving the electric motors 31, 31 and the hydraulic cylinder 72 and the like.

Next, the operation of the first embodiment will be described with reference to FIG.
Since the work vehicle to which the caster wheel of the first embodiment is applied is configured as described above, when the work vehicle 1 shown in FIG. 18A is changed from the forward travel state to the reverse travel state,
First, as shown in FIG. 18B, when the traveling direction of the work vehicle 1 changes, the position of the caster arm 21 intersects the moving direction of the work vehicle 1 due to frictional resistance with the road surface received by the wheels 22. As the wheel 22 moves, the wheel 22 rotates around its rotation axis position Q2, and when the wheel 22 rotates 90 degrees as shown in FIG. 18 (c), the axle leg 23 moves to the rotation axis position Q2 of the wheel 22, Then, as shown in FIG. 18 (d), when the axle leg 23 is further moved in the traveling direction of the work vehicle 1 and the wheels are rotated by 180 degrees, as shown in FIG. The position moves to a position that overlaps the line connecting the shaft leg 23 and the rotation axis position Q2 of the wheel 22, and thereby the direction change of the caster wheel is completed without the shaft leg 23 sideways.

Next, the effect of the first embodiment will be described.
In the caster wheel according to the first embodiment, as described in detail above, an effect is obtained that the side shake of the work vehicle 1 when the traveling direction of the work vehicle 1 is reversed can be minimized. It is done.

  Further, by making the offset amount of the rotation axis position of the wheel 22 and the caster arm 21 and the offset amount of the caster arm 21 and the shaft leg 23 the same, the work vehicle 1 when the traveling direction of the work vehicle 1 is reversed. Can be prevented almost completely.

  In addition, since the wheels 22 of the caster wheel have two wheels, the frictional resistance between the wheels 22 and the road surface is increased, so that the side shake prevention effect of the work vehicle 1 when the traveling direction of the work vehicle 1 is reversed is enhanced. Will be able to.

  The driven wheel 2, the two driving wheels 3 and 3, the driver's seat 4, the forward / reverse switching means 5, and the steering means 6 are provided. As the driven wheel 2, the rotating shaft of the wheel 23 with respect to the caster arm 21. A caster wheel having a shaft leg 23 whose position is offset in the horizontal direction and offset from the rotation axis position of the wheel 22 with respect to the caster arm 21 is used, and the shaft leg 23 is rotatably attached to the work vehicle 1. By adopting the configuration, it is possible to obtain an effect that the direction can be changed without side-shocking even in a narrow warehouse.

  Further, the drive wheels 3 and 3 are driven by independent electric motors 31 and 31, respectively, and the steering means 6 is configured to be steered by the rotational difference between the electric motors 31 and 31, so that the work vehicle 1 turns. The radius can be minimized.

  Further, since the driver's seat 4 is configured to be reversible in the forward / backward direction of the work vehicle 1, driving and work operations can always be performed in the traveling direction even in places where turning is impossible.

  Further, by inserting the lock pin 42 provided in the rotating shaft support 41 of the driver's seat 4 into the engagement hole 12 provided in the vehicle body frame 11 of the work vehicle 1, the direction of the driver's seat 4 is changed in the forward direction in the forward and backward directions. By being configured to be able to lock in the reverse direction, it becomes possible to lock and release with a simple structure.

  In addition, the lock pin 42 is configured so that the engagement state with the engagement hole 12 is maintained by the inactive force of the spring 43 and can be released by stepping on the stepping type unlocking pedal 44, so that only the stepping operation is performed. The lock and release operations can be performed quickly.

  Further, in front of the driver's seat 4, a single operation lever 8 for operating the forward / reverse switching means 5 and the steering means 6 is provided, and the operation lever 8 is tilted in the front-rear direction from the neutral position. Switching of the traveling direction and adjustment of the traveling speed are performed, and the steering operation is performed by adjusting the rotational difference between the electric motors 31 and 31 by rotating in the left-right direction. Travel speed adjustment, traveling direction switching, and steering can be performed with only one hand operation of the lever 8, and other operations such as lifting / lowering operation of the forklift 7 are simultaneously performed by a lift lifting switch 71 provided on the operation lever 8. Will be able to.

  Further, since the operation lever 8 is configured to always return to the neutral position when no operation is performed, it is possible to prevent an emergency runaway such as when the driver falls.

  Moreover, since all the driving | running | working, such as vehicle travel and lift raising / lowering, is performed with the electric power of the battery 9, it is excellent in environmental performance.

  Although the present embodiment has been described above, the present invention is not limited to the above-described embodiment, and design changes and the like within a scope not departing from the gist of the present invention are included in the present invention.

  For example, in the embodiment, the work vehicle is described as an example of the moving body, but it can be applied to a bogie, a chair, and all other moving bodies.

  Further, in the working vehicle of the embodiment, the driven wheel 2 constituted by the caster wheel is one wheel and the drive wheel is the three wheels, but the driven wheel 2 constituted by the caster wheel is changed to two wheels. Good.

  Further, in the embodiment, an example in which the wheels 22 of the caster wheel are two wheels is shown, but one wheel may be used.

  In the embodiment, the driver seat 4 is reversed manually, but it may be electrically driven.

1 Working vehicle (moving body)
11 Body frame 12 Engagement hole 2 Driven wheel (Caster wheel)
DESCRIPTION OF SYMBOLS 21 Caster arm 22 Wheel 23 Shaft leg 24 Bearing 25 Bearing 3 Drive wheel 31 Electric motor 4 Driver's seat 41 Shaft support part 42 Lock pin 43 Spring 44 Unlocking pedal 45 Seat part 5 Front marching switching means 6 Steering means 7 Forklift 71 Lift lift switch 72 Hydraulic cylinder 73 Link mechanism 74 Fork 8 Operation lever 81 Spring 9 Battery 10 Link mechanism

Claims (10)

In the caster wheel in which the rotation axis position of the wheel is offset horizontally with respect to the caster arm
A caster wheel comprising: a shaft leg that is offset from a rotational axis position of the wheel with respect to the caster arm; The caster wheel according to claim 1,
The caster wheel according to claim 1, wherein an offset amount between the rotation axis position of the wheel and the caster arm and an offset amount between the caster arm and the shaft leg are the same. The caster wheel according to claim 1 or 2,
A caster wheel, wherein the wheels are two wheels. A driven wheel, two drive wheels, a driver's seat, a forward / reverse switching means and a steering means,
As the driven wheel, there is used a caster wheel having a shaft leg in which a rotational axis position of a wheel is offset in a horizontal direction with respect to a caster arm, and a shaft leg offset from the rotational axis position of the wheel with respect to the caster arm. A work vehicle having a caster wheel, wherein a leg is rotatably attached to the work vehicle. In the work vehicle provided with the caster wheel according to claim 4,
Both the drive wheels are driven by independent electric motors,
The work vehicle having a caster wheel, wherein the steering means is configured to be steered by a rotational difference between the two electric motors. In a work vehicle comprising the caster wheel according to claim 4 or 5,
A work vehicle having a caster wheel, wherein the driver's seat is configured to be reversible in a forward / backward direction of the work wheel. In the work vehicle provided with the caster wheel according to claim 6,
By inserting a lock pin provided on the rotating shaft support portion of the driver's seat into an engagement hole provided in the vehicle body frame of the work wheel, the direction of the driver's seat can be locked in the forward and backward directions in the forward and backward traveling directions. A work vehicle having a caster wheel, characterized by being configured. In the work vehicle provided with the caster wheel according to claim 7,
The lock pin has a caster wheel characterized in that the engagement state with the engagement hole is maintained by an inactive force of the spring, and the lock pin can be released by stepping on a stepping type unlocking pedal. Working vehicle. In the work vehicle provided with the caster wheel according to any one of claims 4 to 8,
One operating lever for operating the forward / reverse switching means and the steering means is provided in front of the driver's seat, and the traveling direction is switched and traveled by tilting the operating lever back and forth from the neutral position. A work vehicle equipped with a caster wheel, wherein speed is adjusted and steering is performed by adjusting a rotational difference between both electric motors by rotating in a horizontal direction. In the work vehicle provided with the caster wheel according to claim 9,
A work vehicle having a caster wheel, wherein the operation lever is configured to always return to a neutral position when no operation is performed.

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