JPH07137548A - Wheel driving device for high lift work vehicle - Google Patents

Abstract

PURPOSE:To provide the wheel driving device which is convenient to pull/push an elevation work vehicle which is so constituted as to have a work stand freely moved up and down in a mobile car body, by another vehicle. CONSTITUTION:The wheel driving device is so constituted that a wheel support section in which a transmission system D to a drive wheel 3 is built, is divided so as to be formed into a support case 10 mounted on a car body side and a passive case 12 rotatably mounting the drive wheel 3, the passive case 12 is installed in such a way as to be freely moved up and down with respect to the support case 10, and a clutch 16 which is engaged/disengaged as both of the cases are relatively moved up and down, is interposed between a drive shaft 14 provided for the side of support case 10 and a passive shaft 17 at the passive case 10 side, so that the clutch 16 is so designed as to be engaged with both of the cases relatively moved when a work stand is subjected to a weight equal to or more than a specified value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel drive device suitable for use in a small aerial work vehicle.

[0002]

2. Description of the Related Art A small aerial work vehicle is known, which is constructed by equipping a work platform on the body of a self-propelled vehicle so that the work platform can be lifted and lowered.
A self-propelled vehicle of this type is generally configured to be capable of straight traveling and turning traveling by a pair of left and right caster wheels and a pair of left and right driving wheels.

[0003]

By the way, in the conventional small aerial work vehicle, when the vehicle is towed by another vehicle or manually pushed, the separately prepared idle wheel is grounded and the drive wheel is grounded. In most of the cases, the vehicle body cannot be easily moved unless it is levitated. Therefore, there is a problem that it takes time to prepare for the towing or pushing movement. In addition, some of the vehicles have a clutch for the driving mission that transmits power to the drive wheels, and the drive wheels can be changed to be freely rotatable with respect to the axle. It was only a little easier to prepare than the one to be surfaced. The present invention has been made in view of such a point, and its object is to immediately move a high-place work vehicle by towing or moving by hand without using any preparation work. It is to be able to move lightly.

[0004]

In order to achieve the above object, in the present invention, a workbench capable of moving up and down on a traveling vehicle body (1) provided with drive wheels (3) (3). In an aerial work vehicle equipped with (5), the drive wheel (3)
Clutch (16) in transmission system (D) (D) that transmits power to (3)
(16) is provided, and the clutches (16) and (16) are provided on the workbench.
The wheel drive device for an aerial work vehicle is characterized in that the connection is automatically made depending on the presence or absence of a weight load equal to or more than the value set in (5). Then, as a more specific embodiment, a wheel support portion for mounting a transmission system (D) to the drive wheel (3) is mounted on the vehicle body (1) side and a drive wheel (10). 3) is divided into a passive case (12) which is mounted on the shaft, and the passive case (12) is attached to the support case (10) so as to be vertically movable, and the support case (10) is attached. Drive shaft provided on the side
A clutch (16), which is disengaged by the relative movement of both cases (10) and (12) in the vertical direction, is interposed between (14) and the passive shaft (17) on the side of the passive case (12). When the workbench (5) is loaded with a weight more than the set value, it is preferable that the clutch (16) is connected by the vertical relative movement of both cases (10) and (12).

[0005]

In the aerial work vehicle equipped with the device of the present invention configured as described above, the workbench (5) is not loaded with a weight equal to or more than the set value, that is, the workbench (5) is operated by the operator. When the vehicle does not ride, the clutches (16) (16) of the transmission system (D) (D) to the drive wheels (3) (3) are kept in the non-joined state and
(3) Since (3) is in the free rotation state, when towing an aerial work vehicle by another vehicle or manually moving it, it is possible to immediately tow or manually move it without any preparation work. Is.

[0006]

FIG. 1 shows an example of an aerial work vehicle in which the device of the present invention is implemented. This aerial work vehicle
A pair of left and right caster wheels (2) and (2) are provided at the front of (1), and a pair of left and right drive wheels (3) are provided at the rear of the traveling vehicle body.
(3) is deployed and configured, a pair of left and right drive wheels
(3) (3) can be rotationally driven in the same way to the left or right by a transmission system (D) and (D) described later, or in a state where the left and right are differential. A support column (4) is erected above the front part of the traveling vehicle body (1), and a workbench (5) capable of moving vertically along the column (4).
Is provided.

The support column (4) is composed of a holding cylinder (4a) fixed to the vehicle body (1) side and an elevating cylinder (4b) slidably fitted on the holding cylinder (4a). Both cylinders (4a) (4b)
The lifting cylinder (4b) is moved up and down with respect to the holding cylinder (4a) by the operation of the lifting drive mechanism (L) housed in the inside of the holding cylinder.
The workbench (5) connected to the (4a) can be moved up and down as desired.

The lifting drive mechanism (L) is composed of a lifting cylinder (4b).
Screw shaft (6) provided with a female screw body mounted on the vehicle body (1) side
Electric motor equipped with the screw shaft (6) on the vehicle body.
The female screw body, that is, the elevating cylinder, is driven by rotating in (7).
The (4b) side is configured to be capable of shifting in the vertical direction, or a chain or wire that is rotationally driven by an electric motor is wound around the vehicle body (1) and the holding cylinder (4a) side, and is lifted and lowered.
(4b) interlockingly connected, and lifting cylinder by the rotation of chain etc.
It is possible to adopt various means such as a structure in which the side (4b) is moved up and down.

Further, whether the electric motor (7), which is the drive source of the lifting drive mechanism (L), is operated by the battery (8) mounted on the vehicle body (1) or by an external power source (not shown). Alternatively, it can be selectively operated by either a battery or an external power source. Further, a driving operation unit for operating and stopping the lifting drive mechanism (L).
(9) is provided on the side of the elevating cylinder (4b) so that the operator can work on the workbench.
It can be operated by the posture that got on (5).

The drive wheels (3) and (3) and the transmission systems (D) and (D) for transmitting power to the drive wheels (3) and (3) are provided in a structure as shown in FIGS. 2 and 3,
A support case (10) is attached to a predetermined portion of the vehicle body (1),
A passive case (12) is fitted to the lower end of the support case (10) by a wedge fitting means (11) such as a spline so as to be slidable in the vertical direction, and the support case is supported within a predetermined range. -Su (10)
It is held by the retaining means (13) so that it can be moved up and down with respect to it, but it does not fall off.

A drive shaft (14) having a vertical axis is provided on the support case (10) side, and the drive shaft (14) is interlocked with an electric motor (15) for driving wheels. Electric motor
It is rotated or stopped by the on / off operation of (15) and is rotated in the forward / reverse direction by the rotation direction switching operation of the electric motor. These operations are performed by the electric motor in the lifting drive mechanism (L). The operation section as in the operation of the
It can be done in (9).

The drive side (16a) of the clutch (16) is mounted on the lower shaft end of the drive shaft (14), and the corresponding clutch driven side (16b) is supported by the support case (16). 1
(0) is provided at the upper end of a passive shaft (17) bearing-supported on the side of the passive case (12) that slides up and down with respect to the support case (10) and the passive case (10). 12) A compression spring (18) interposed between them is elastically biased in the non-joining direction. In addition,
The compression spring (18) causes the clutch (16) to be loaded by the load when the workbench (5) is loaded with a weight equal to or more than a set value.
The spring pressure is set so that the driving side (16a) and the driven side (16b) are joined to each other. The spring pressure is provided with an arbitrary adjusting means or the compression spring (18).
It is preferable that it can be changed as required by means such as exchanging. Further, when the transmission torque (equal to or more than the set value) is applied when the driving side (16a) and the driven side (16b) of the clutch (16) are in the joined state, slippage occurs to avoid damage to the transmission system. It is safe to configure it.

The passive shaft (17) bearing-supported on the side of the passive case (12) is provided with its axis aligned with the drive shaft (14), and the bevel gear (19) is provided at the lower shaft end thereof. ) Is fitted, and the bevel gear (19) is horizontally supported on the passive case (12) by bearings. The bevel gear (21) of the axle (20).
Clutch engaged with the drive shaft (14) at all times
The power transmitted to the passive shaft (17) via (16) is applied to the axle.
The drive wheel (3) fitted to the axle is rotated to drive the wheel (3).

In the aerial work vehicle constructed as in the embodiments of FIGS. 1 to 3, the workbench (5) is not loaded with a weight greater than a set value, that is, the workbench (5) is not loaded. When the operator is not riding, the clutches (16) (16) of the transmission system (D) (D) to the drive wheels (3) (3) are kept in the non-joined state, and
(3) Since (3) is in the free rotation state, it is easy to move the aerial work vehicle when it is towed by another vehicle or manually pushed, and it is economical and power saving.

However, when the worker reaches a place where work is performed at a high place and gets on the workbench (5), the weight of the worker causes the vehicle body to move.
The (1) side descends and the drive side (16a) and the driven side (16b) of the clutch (16) are joined, and the power is transmitted to the drive wheels (3) and (3). Therefore, in this state, the operator on the workbench (5) operates the driving operation part (9) in a desired manner, so that the transmission system (D) to the drive wheels (3) and (3).
(D) can be operated to freely drive the aerial work vehicle with power.

FIGS. 4 and 5 show a modification of the present invention. This modification is different from the embodiment of FIGS. 1 to 3 in the following points. When the clutch is in the disengaged state (the state shown in FIG. 4), the passive case (12) is supported by the support case (1).
It is provided such that it is kept rotatable with respect to 0), and when it is relatively raised to the position where the clutch is joined, it is wedged to the support case (10) in a non-rotatable state. There is.
Then, in order to allow the rotation of the passive case (12) in the non-clutched state, the retaining means (13) is formed in an arc shape around the axes of the drive shaft (14) and the passive shaft (17). The engaging members (23) on the vehicle body (1) side are engaged with the long holes (22). Further, the compression spring (18) for elastically biasing the clutch (16) in the non-joining direction is provided with the retaining means.
It is composed of a plurality of springs that are detachably attached to the latching member (23) of (13) and that can adjust the spring pressure so that a predetermined spring pressure can be obtained by these springs. There is.

FIG. 6 shows another modification of the present invention. This modification has a drive shaft (14) and a passive shaft.
A switch (16) which is interposed between the electromagnetic clutch and the clutch (16) is turned on / off by a weight detection plate (24) provided on the workbench (5).
The control circuit with (25) is configured to operate as expected.

The embodiment of FIGS. 1 to 3, the modifications of FIGS. 4 to 5 and the other modifications of FIG. 6 are all holding cylinders (4a).
The workbench (5) is attached to the elevating cylinder (4b) that is vertically movable
And the workbench (5) by moving the lifting tube (4b) up and down.
However, the lifting means of the workbench (5) is not limited to the one shown in the figure. For example, the workbench is lifted by a scissor link, or the workbench is lifted by a winch. It can be changed in any other way, such as moving up and down.

[0019]

According to the wheel drive system for an aerial work vehicle of the present invention, a clutch provided in a transmission system for transmitting power to drive wheels is automatically operated depending on whether a work table is loaded with a weight equal to or more than a set value. When the vehicle is not working, i.e., when the operator is not on the workbench, the drive wheels are kept in a freely rotating state, so the aerial work vehicle is towed by another vehicle. When you move or push
It can be towed or pushed by hand without any preparatory work.

[Brief description of drawings]

FIG. 1 is an overall perspective view of an aerial work vehicle to which the present invention is applied.

FIG. 2 is a sectional view of a main part of a wheel drive device according to the present invention.

FIG. 3 is an explanatory diagram showing a transmission state of a wheel drive device.

FIG. 4 is a cross-sectional view of essential parts showing a modified example of the present invention.

FIG. 5 is a partial view showing a retaining means in a modified example.

FIG. 6 is an explanatory diagram showing another modification of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Running vehicle 3 Drive wheels 5 Work table D Transmission system 10 Support case 12 Passive case 14 Drive shaft 16 Clutch 17 Passive shaft

Claims (2)

[Claims] 1. A traveling vehicle body (1) having driving wheels (3) (3)
In an aerial work vehicle that is equipped with a workbench (5) capable of moving up and down, a clutch (16) is provided on a transmission system (D) (D) for transmitting power to the drive wheels (3) (3). (16) is provided, and the clutches (16) and (16) are automatically engaged and disengaged according to the presence or absence of a weight load on the workbench (5) which is equal to or greater than a set value, and Wheel drive. 2. A traveling vehicle body (1) provided with drive wheels (3) (3).
In an aerial work vehicle configured to be equipped with a workbench (5) capable of moving up and down, a wheel support portion that internally houses a transmission system (D) to each drive wheel (3) is provided on the vehicle body (1) side. Support case installed on the
The passive case (12) is divided into a passive case (12) around which the driving wheel (3) is mounted, and the passive case (12) is supported by the support case (1).
It is attached so that it can move up and down with respect to
The clutch (10) (12) between the drive shaft (14) provided on the side (0) and the passive shaft (17) on the side of the passive case (12) is discontinuous by the relative movement in the vertical direction. 16)
When the workbench (5) is loaded with a weight more than a set value, the clutch is moved by the relative movement of both cases (10) and (12) in the vertical direction.
(16) A wheel drive device for an aerial work vehicle, which is connected.