KR102275185B1 - Power coupled device of a front working machinery for Multi-purpose Utility vehicle and front working attachment including same - Google Patents

Abstract

Disclosed are a front work machine power connection device for a multi-purpose transport vehicle and a front work machine attachment device including the same. A front work machine power connection device according to an aspect of the present invention is a device that connects a vehicle-side power take-out shaft and a work machine-side power input shaft to transmit power when the work machine is attached to the front of the multi-purpose transport vehicle, and the work machine-side mounting surface when the work machine is attached It includes a movable member that moves linearly in contact with the movable member, a rotation member that rotates with respect to a central hinge axis in association with the linear motion of the movable member, and a clutch member that is integrally rotatably connected to the end of the power take-off shaft, wherein the clutch member is movable The gist of the configuration is to slip toward the power input shaft of the working machine in conjunction with the rotational movement of the rotation member by the linear motion of the member and to be coupled with the power input shaft.

Description

Power coupled device of a front working machinery for Multi-purpose Utility vehicle and front working attachment including same

The present invention relates to a front work machine power connection device for a multi-purpose transport vehicle and a front work machine attachment device including the same, and more particularly, to a front work machine power connection for a multi-purpose transport vehicle for power connection between a work machine attached to the front of the multi-purpose transport vehicle and the vehicle It relates to a device and a front work machine attachment device including the same.

Utility vehicle (UTV) is widely used in a wide range of fields such as distribution, construction, leisure, and agriculture. In particular, since such a multi-purpose transport vehicle has a structure advantageous for rough road driving, it is mainly used as a transport means for loading and transporting soil or crops at a construction site or an agricultural site, or for loading and carrying tools necessary for various tasks.

Recently, in order to increase the utility of the conventional multi-purpose transport vehicle limited to movement and transport, it is provided in a structure in which various types of work machines can be selectively attached to the front of the vehicle. For example, as in the US Patent Publication of US 2014/0060953 No., it is provided in a form equipped with a work machine attachment means at the front end of the vehicle to be able to elevate for attachment of various front work machines.

As shown in FIG. 1, the work machine attachment means 200 of the multi-purpose transport vehicle applied to US 2014/0060953 has two work machine operating cylinders (elevating and tilting cylinders, 210 and 220), and the two cylinders It is configured so that the desired work can be performed by variously adjusting the height of the front work machine and the angle of the work machine with respect to the vehicle according to the work purpose through independent control.

In addition, work machines that require rotational power such as rotary brushes or mowers for snow removal are also provided in an attachable form. ) is equipped with a power connection means (not shown) of a configuration including a coupling gear and the like for a selective power transmission possible connection with the.

However, the power connection means applied to the front work machine attachment means of the conventional multi-purpose transport vehicle has a mechanical configuration, and has a structure in which the PTO shaft and the work machine side power input shaft are directly connected manually after connecting the work machine. Accordingly, when attaching a front working machine that requires rotational power, such as a rotary brush or a mower, there is a problem in that the work time is delayed.

In addition, a universal joint is used in the middle of the power take-off shaft extending in front of the vehicle so that power can be transmitted smoothly even when the front work machine is lifted and tilted, but the angle of refraction of the power take-off shaft with the front work machine attached is the power transmission allowable angle. If it exceeds, power transmission is not smooth and there is a problem in that the power take-off shaft is deformed or damaged.

US Patent Publication No. 2014-0060953 (published on Mar. 06, 2014)

The problem to be solved by the present invention is for a multi-purpose transport vehicle that can connect the vehicle-side power take-off shaft and the work machine-side power input shaft to transmit power without separate operation when a front work device that requires rotational power is attached to the front of the multi-purpose transport vehicle It is to provide a power connection device for the front working machine.

Another problem to be solved by the present invention is to provide a front work machine attachment device for a multi-purpose transport vehicle that can prevent damage to the power take-off shaft by limiting the lifting and lowering of the work machine to a certain height when attaching a work machine that requires rotational power to the front of the multi-purpose transport vehicle. that you want to provide.

According to one aspect of the present invention as a means for solving the problem, it is a device that connects a vehicle-side power take-off shaft and a work machine-side power input shaft to transmit power when the work machine is attached to the front of the multipurpose transport vehicle, and the work machine-side mounting surface when the work machine is attached A movable member that moves in a straight line by contacting it; a rotation member for rotational movement with respect to the central hinge axis in association with the linear motion of the movable member; and a clutch member integrally rotatably connected to an end of the power take-off shaft, wherein the clutch member slides toward the power input shaft on the working machine side in association with the rotational motion of the rotation member by the linear motion of the movable member It provides a power connection device for a front work machine for a multi-purpose transport vehicle, characterized in that the shaft joint with the power input shaft.

The power connection device according to an aspect of the present invention may further include a guide member for guiding the linear movement of the movable member, wherein the movable member and the rotation member, and the rotation member and the clutch member are connected via a connection link. It may be a configuration that is mutually refractionable.

And the clutch member includes: a boss connected to the rotation member and linearly moving along a power take-off shaft; an engaging tool assembled to an end of the power take-off shaft passing through the boss so as to be integrally rotatable and axially movable and slipping toward the power input shaft by the boss; An elastic body for elastically connecting the boss and the engaging sphere between the boss and the engaging sphere so as to be interlocked; may be configured to include.

In addition, it may further include a support member for supporting the rotational motion of the power take-off shaft at the rear of the clutch member, preferably a support member including a bearing or bush in contact with the outer surface of the power take-off shaft.

As an embodiment, the pressing pin may be configured to protrude by a predetermined length from the mounting surface of the work machine in response to the movable member, and the movable member may be linearly moved (retracted) by being pressed by the pressure pin when the work machine is attached.

As another preferred embodiment, a protrusion is formed on the distal end surface of the movable member to protrude further outward than the distal end face of the clutch member, and when the work machine is attached, the work machine-side mounting surface is in contact with the protrusion so that the movable member is a straight line. It may be configured to exercise (retreat).

According to another aspect of the present invention as a means for solving the problem, the attachment unit having a power connection device according to the above-described aspect and to which a front working machine is attached; a fixing unit fixed to the front frame of the multi-purpose transport vehicle and protruding toward the front of the vehicle; a connection unit for refractably connecting the attachment unit and the fixing unit; and a tilting cylinder for generating a driving force for adjusting the tilting angle of the attachment unit with respect to the connection unit and a lifting cylinder for generating a driving force for lifting and lowering the connection unit with respect to the fixed unit; provides

In another aspect of the present invention, the connection unit may be configured to include a stopper for limiting the lifting and lowering of the attachment unit to a certain range when attaching the work.

In this case, the stopper may be configured to limit the lifting and lowering of the movable member to a predetermined height when the movable member of the power connection device is retracted in association with the attachment of the work machine.

According to the power connection device for a front work machine for a multi-purpose transport vehicle according to an embodiment of the present invention, the movable member is pushed back together with the attachment of the front work machine requiring rotational power, and the clutch member at the tip of the power take-off shaft is drawn out to the front to power the work machine. By being jointed with the input shaft, the power take-off shaft and the power input shaft may be connected to each other so as to transmit power to each other.

That is, when the front work machine that requires rotational power is attached, the vehicle-side power take-off shaft and the work machine-side power input shaft are connected so as to be able to transmit power together with the work machine attachment without separate manipulation, so that the front work machine requiring rotational power In attaching the , it is possible to solve problems such as the inconvenience for the connection that can transmit power between the axes and the delay of the working time.

In addition, according to the apparatus for attaching a front work machine for a multi-purpose transport vehicle according to another embodiment of the present invention, the stopper restricts the lifting height of the attachment unit to a certain height in a state where a work machine requiring rotational power is attached to the front of the multi-purpose transport vehicle make up Accordingly, deformation or damage of the power take-off shaft as the refraction angle of the power take-off shaft exceeds the allowable power transmission angle can be prevented.

1 is a perspective view of a multi-purpose transport vehicle equipped with a front work machine attachment device according to the prior art;
2 is a perspective view of a front work machine power connection device for a multi-purpose transport vehicle according to an aspect of the present invention;
Figure 3 is a plan view of the power connection device shown in Figure 2;
4 is an enlarged cross-sectional view of a joint between the power take-off shaft and the clutch member of FIG. 2;
5 is an operation state diagram of a front work machine power connection device for a multi-purpose transport vehicle according to an aspect of the present invention.
Figure 6 is a partial exploded perspective view of the front working machine attachment device according to another aspect of the present invention.
Figure 7 is a combined perspective view of the front working machine attachment device according to another aspect of the present invention.
Fig. 8 is an enlarged view showing the main part of the working machine attachment device shown in Fig. 7 on an enlarged scale;

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments described below are provided so that those skilled in the art can easily understand the technical spirit of the present invention, and it is pointed out that the present invention is not limited to the suggested form. In addition, it is pointed out that the matters expressed in the accompanying drawings may be different from the forms actually implemented in the drawings schematically for easy explanation of the embodiments of the present invention.

In addition, the expression 'including' certain components merely refers to the existence of the components as an expression of 'open type', and should not be construed as excluding additional components.

First, a power connection device for a front work machine for a multi-purpose transport vehicle according to an aspect of the present invention will be described.

2 is a perspective view of a power connection device for a front working machine for a multi-purpose transport vehicle according to an aspect of the present invention, and FIG. 3 is a plan view of the power connection device shown in FIG. 2 .

2 to 3 , the power connection device 3 according to an aspect of the present invention includes a vehicle-side power take-off shaft 40 and a work machine-side power input shaft 20 (see FIG. 5 ) when the work machine is attached to the front of the multi-purpose transport vehicle. ) to enable power transmission, and is configured to bind the power take-off shaft 40 to the power input shaft 20 at the same time as the attachment of the front work machine requiring rotational power.

Specifically, the power connection device 3 according to an aspect of the present invention includes a movable member 30 and a movable member 30 that linearly move in contact with the mounting surface of the work machine side mount (2, see FIG. 5) when the work machine is attached. ) is provided with a rotation member 34 for rotational movement based on the central hinge axis (H) in conjunction with the linear movement of the. And it includes a clutch member 36 rotatably connected integrally to the end of the power take-off shaft (40).

In the present embodiment, the movement directions of the movable member 30 and the clutch member 36 operably connected through the rotation member 34 are opposite to each other. Accordingly, when the mounting surface of the work machine is touched and the movable member 30 is pushed back when the work machine is attached, the clutch member 36 slips in the opposite direction in conjunction with the movement of the movable member 30, and the power input shaft on the work machine side (20) and shaft joint.

The movable member 30 may be a hollow shaft or a solid shaft having a circular or square cross section, but is not particularly limited thereto. There is no particular limitation in structure or shape as long as it is a configuration that moves linearly in conjunction with the attachment of the working machine. When the working machine is attached, one end of the movable member 30 facing the pressing pin 22 becomes an input end, and one end of the rotating member 34 is refractably connected to the other end.

The movable member 30 moves in a straight line by contact with the mounting surface 25 when the working machine is attached with the help of the guide member 32 . That is, the guide member 32 serves as a guide for guiding the linear motion of the movable member 30 . Although the figure illustrates a configuration in which the movable member 30 is configured as a square pillar and the guide member 32 surrounds a portion of the outer surface of the movable member 30, it is not particularly limited thereto.

For example, a concave portion is formed on both side surfaces of the movable member 30 in the longitudinal direction, and a protrusion is formed in the guide member 32 to engage the groove portion and guide the linear motion of the movable member 30, or vice versa, the movable member ( 30) It may include any configuration in which the guide member 32 guides the linear motion of the movable member 30, such as a configuration in which protrusions are formed on both sides in the longitudinal direction and grooves are formed in the guide member 32 .

The rotation member 34 converts the linear motion of the movable member 30 into a rotational motion, and again changes the rotational motion into a linear motion so that the motion directions of the clutch member 36 and the movable member 30 are opposite to each other. is absent To this end, the central portion of the pivot member 34 is rotatably connected to the base 39 through the central hinge shaft H, and one end and the other end thereof are connected to the movable member 30 and the clutch member 36, respectively. connected operably.

The rotation member 34 may be a hollow shaft or a solid shaft having a circular or square cross section, but is not particularly limited thereto, and the movable member 30 and the rotation member 34 , and the rotation member 34 and the clutch member 36 . ) is interposed between the connecting links 31 and 35 in a portion where they are connected to each other so as to be interoperable. That is, the movable member 30 and the rotating member 34, the rotating member 34 and the clutch member 36 are connected to each other through the connecting links 31 and 35 so as to be able to bend.

The clutch member 36 linearly moves along the power take-off shaft 40 in association with the rotation of the rotation member 34 . Specifically, it includes a portion that rotates integrally with the power take-off shaft 40, and the portion that rotates integrally with the power take-off shaft 40 interlocks with the rotation of the rotation member 34 to slip toward the side to which the work machine is attached. to bind the two shafts 20 and 40 together.

Referring to FIG. 4, the clutch member will be described in more detail.

As shown in Fig. 4, the clutch member 36 includes a boss 36a and an engaging tool 36b. The boss 36a is connected to the rotation member 34 and moves linearly on the power take-off shaft in association with the rotation member, and the engaging hole 36b is integral with the end of the power take-off shaft 40 passing through the boss 36a. It is assembled to be rotatably and axially movable and is slid toward the power input shaft 20 by the boss 36a.

The engaging tool 36b is splined or serrated to the end of the power take-off shaft 40 passing through the boss 36a and rotates integrally with the power take-off shaft 40 in the axial direction on the power take-off shaft 40. It can be moved, and is coaxially arranged to be interlocked with the boss 36a through an elastic body 36c such as a coil compression spring that elastically connects between the boss 36a and the engaging sphere 36b.

Accordingly, when the boss 36a linearly moves toward the side to which the working machine is connected in association with the rotational movement of the rotating member 34, the engaging tool 36b elastically connected to the boss 36a also slips in the same direction. Accordingly, the engagement value 360 of the end of the engagement port 36b is engaged with the power input shaft 20 (refer to FIG. 4 ) on the working machine side to transmit power.

At this time, in a state in which the power take-off shaft 40 and the power input shaft 20 are engaged to enable transmission of power, the engaging tool 36b is generated by the restoring force generated by the elastic body 36c installed between the engaging port 36b and the boss 36a. receives a force in a direction in close contact with the power input shaft 20, and therefore, even if the working machine is raised and lowered within a predetermined range, the power connection state of the two shafts 20 and 40 can be stably maintained.

Reference numeral 37 denotes a support member supporting the rotational movement of the power take-off shaft 40 at the rear of the clutch member 36 . The support member 37 may preferably include a bearing or a bush in contact with the outer surface of the power take-off shaft 40 .

The operation of the front work machine power connection device for a multi-purpose transport vehicle according to an aspect of the present invention having such a configuration will be briefly described with reference to FIG. 5 .

5 is a view showing an operating state of the front work machine power connection device for a multi-purpose transport vehicle according to an aspect of the present invention.

Referring to FIG. 5 , a front working machine requiring rotational power, for example, a rotating brush or mower for snow removal or road surface cleaning, has the power connection device according to an aspect of the present invention. The pressing pin 22 and the power input shaft 20 may be formed to correspond to the movable member 30 and the clutch member 36 constituting the (3), respectively.

Therefore, when the front working machine is attached to the power connection device 3, the movable member 30 is pushed back by the working machine-side pressing pin 22 at the same time as attachment, and the rotating member 34 is centered on the central hinge shaft (H). and the clutch member 36 at the front end of the power take-off shaft 40 slides in the opposite direction to the movement of the movable member 30 in linkage with the rotation member 34, so that the power input shaft 20 and becomes an axis.

That is, when the front work machine that requires rotational power is attached, the movable member 30 is pushed back by recognizing the pressure pin 22 provided on the side of the work machine, and the clutch member 36 at the front end of the power take-off shaft 40 is moved forward. By being drawn out and being shaft-joined with the work machine-side power input shaft 20 , the vehicle-side power take-off shaft 40 and the work machine-side power input shaft 20 can be connected to each other so as to transmit power without a separate operation.

In the drawing, the pressing pin 22 is formed to protrude to a predetermined length on the mounting surface 25 on the side of the work machine corresponding to the movable member 30, and when the work machine is attached, the movable member 30 is pressed by the pressure pin 22 to make a straight line. Although exemplifying a configuration that can be moved, conversely, by forming a protrusion on the front end surface of the movable member 30 in contact with the mounting surface of the working machine, the movable member 30 may be configured to move in a straight line when the working machine is attached.

That is, although not specifically shown, a protrusion is formed on the distal end surface of the movable member 30 so as to protrude further outward than the distal end face of the clutch member 36, so that when attaching the work machine, the protrusion is attached to the work machine-side mount on the protrusion. The formed mounting surface 25 (refer to FIG. 6 to be described later) may come into contact and the movable member 30 may be pushed back by a distance corresponding to the length of the protrusion.

Of course, the pressing pin 22 or the protrusion (not shown) is the moment the pressing pin 22 touches the front end surface of the movable member 30 or the moment the mounting surface 25 of the work machine-side mount touches the protrusion tip. It may be formed with a length corresponding to the separation distance between the front end of the engaging tool 36b constituting the clutch member 36 and the front end of the power input shaft 20 on the working machine side.

According to the power connection device for a front work machine for a multi-purpose transport vehicle according to an aspect of the present invention, the movable member is pushed back together with the attachment of the front work machine that requires rotational power and, conversely, the clutch member at the tip of the power take-off shaft is drawn forward to the work machine. By being shaft-joined with the side power input shaft, the power take-off shaft and the power input shaft can be connected to each other so as to transmit power.

That is, when the front work machine that requires rotational power is attached, the vehicle-side power take-out shaft and the work machine-side power input shaft are connected so that power can be transmitted together with the work machine attachment without separate manipulation, so that the front work machine requiring rotational power In attaching the , the inconvenience of connecting the power transmission between the shafts and the resulting delay in working time can be solved.

Next, look at the front work machine attachment device including the power connection device according to the aspect described above.

6 is a partially exploded perspective view of the front work machine attachment device according to another aspect of the present invention, and FIG. 7 is a combined perspective view of the front work machine attachment device according to another aspect of the present invention.

6 to 7, the front work machine attachment device 1 is fixed to the front frame of the multi-purpose transport vehicle and the attachment unit 10 having the power connection device 3 according to the above-described aspect, and is fixed to the vehicle. A fixing unit 14 protruding forward is provided. And it includes a connection unit (16) for connecting the attachment unit (10) to the fixing unit (14) to be articulated.

The attachment unit 10 is provided with an attachment base 102 to which the front working machine can be attached, and the power connection device 3 according to the above-described aspect is provided. In addition, a tilting bar 104 is provided for adjusting the front and rear tilting angles with respect to the connection unit 16 in the working machine attached state. And one end of the tilting cylinder 17 for generating a driving force for adjusting the tilting angle is connected to the outer edge of the tilting bar 104 .

The fixing unit 14 may be provided with a mounting frame 140 for attachment and fixing to a front body frame (not shown). A first supporter 142 to which the other end of the tilting cylinder 17 is pivotally connected is provided on one side of the front side of the mounting frame 140, and the connection unit 16 is lifted with respect to the fixed unit 14 on the other side of the opposite side. A second support 144 to which the upper end of the lifting cylinder 19 for generating a driving force is pivotally connected may be provided.

The lower end of the lifting cylinder 19 may be pivotally connected to one side of the upper surface of the connection unit 16 . The power take-off shaft 40 extending from the vehicle-side mission unit and extending in front of the vehicle body passes between the first support 142 and the second support 144 of the fixing unit 14 to provide the power of the attachment unit 10 . A universal joint 42 is provided in the middle portion of the power take-off shaft 40 that extends to the connection device 3 and is located between the attachment unit 10 and the connection unit 16 .

The tilting cylinder 17 and the elevating cylinder 19 may be hydraulic or pneumatic cylinders of a double-acting structure, and are attached to the attachment unit 10 through independent control of the two cylinders using hydraulic or pneumatic pressure. You can adjust the lifting and tilting of the In other words, the height of the front work machine and the angle of the work machine with respect to the vehicle can be variously adjusted according to the work purpose.

The connection unit 16 is positioned in such a manner that a part of the power connection device 3 of the attachment unit 10 overlaps between two opposed arms 160 and 162 for connection with the attachment unit 10 . It may be a configuration in which the receiving part 161 is formed so as to be able to do so, but is not particularly limited thereto. In addition, the connection unit 16 may be provided with a stopper 18 for limiting the lifting and lowering of the attachment unit 10 to a certain range when attaching the work.

FIG. 8 is an enlarged view showing the main part of the working machine attachment device shown in FIG. 7 in an enlarged view, and is an enlarged view of the part where the stopper is installed.

As shown in FIG. 8 , the stopper 18 may be installed at the front end of the connection unit 16 at a position corresponding to the movable member 30 . The stopper 18 is preferably at a certain height so that one end of the movable member 30 can be positioned therebetween when the movable member 30 is pushed back by being pressed by the pressing pin 22 when the work machine is attached. It may have a configuration in which the concave portion 180 is formed.

In the drawings, the stopper 18 having a 'C'-shaped plate-like structure with an open front end is illustrated, but it is not particularly limited to this form. When the attachment unit 10 is raised and lowered in a state in which the movable member 30 is pushed back by being pressed by the aforementioned pressing pin 22 when attaching the work machine, as long as the lifting and lowering of the movable member 30 can be limited to a certain range, the There is no particular limitation on the shape or size.

According to another aspect of the present invention, the lifting and lowering of the attachment unit is limited to a certain height on the stopper in a state where a work machine requiring rotational power is attached to the front of the multipurpose transport vehicle, so that the angle of refraction of the power take-off shaft exceeds the allowable angle of power transmission. It is possible to prevent the working machine from being raised and lowered to such an extent that it is possible to prevent the power take-off shaft from being deformed or damaged.

In the above detailed description of the present invention, only specific embodiments thereof have been described. However, it is to be understood that the present invention is not limited to the particular form recited in the detailed description, but rather, it is to be understood to cover all modifications and equivalents and substitutions falling within the spirit and scope of the invention as defined by the appended claims. should be

1 : Front work machine attachment device 3 : Power connection device
10: attachment unit 14: fixed unit
16: connection unit 18: stopper
20: power input shaft 22: pressure pin
30: movable member 31, 35: connecting link
32: guide member 34: rotation member
36: clutch member 39: base
40: power take-off shaft

Claims (9)

It is a device that connects the power take-off shaft of the vehicle side and the power input shaft of the work machine side to transmit power when the work machine is attached to the front of the multi-purpose transport vehicle.
A movable member that moves in a straight line in contact with the mounting surface of the work machine when attaching the work machine;
a rotation member for rotational movement with respect to the central hinge axis in association with the linear motion of the movable member; and
and a clutch member rotatably connected to an end of the power take-off shaft.
The clutch member slides toward the power input shaft on the working machine side in conjunction with the rotational movement of the rotational member by the linear motion of the movable member, so that the power take-off shaft and the power input shaft are connected.
A front work machine power connection device for a multipurpose transport vehicle, characterized in that a pressing pin protrudes to a predetermined length on the mounting surface of the work machine in response to the movable member, and the movable member moves linearly by being pressed by the pressure pin when the work machine is attached.
The method of claim 1,
It further includes; a guide member for guiding the linear motion of the movable member,
The front working machine power connection device for a multipurpose transport vehicle, characterized in that the movable member and the rotating member, and the rotating member and the clutch member are mutually articulated through a connecting link.
The method of claim 1,
The clutch member is
a boss connected to the rotation member and linearly moving on the power take-off shaft;
an engaging sphere assembled to an end of the power take-off shaft passing through the boss so as to be integrally rotatably and axially movable and slid toward the power input shaft by the boss; and
and an elastic body that elastically connects the boss and the engaging sphere between the boss and the engaging sphere so as to be interlocked.
The method of claim 1,
The front work machine power connection device for a multi-purpose transport vehicle further comprising a; a support member for supporting the rotational motion of the power take-off shaft at the rear of the clutch member.
delete The method of claim 1,
A protrusion is formed on the front end surface of the movable member to protrude further outward than the front end face of the clutch member, and when the work machine is attached, the work machine-side mounting surface comes into contact with the protrusion so that the movable member moves linearly. Front working machine power connection device for multi-purpose transport vehicle.
An attachment unit having the power connection device according to claim 1 and to which a front working machine is attached;
a fixing unit fixed to the front frame of the multi-purpose transport vehicle and protruding toward the front of the vehicle;
a connection unit for refractably connecting the attachment unit and the fixing unit; and
A front work machine attachment device for a multi-purpose transport vehicle including a tilting cylinder for generating a driving force for adjusting the tilting angle of the attachment unit with respect to the connection unit and a lifting cylinder for generating a driving force for lifting and lowering the connection unit with respect to the fixed unit.
8. The method of claim 7,
The connection unit is a front work machine attachment device for a multipurpose transport vehicle, characterized in that it includes a stopper for limiting the lifting and lowering of the attachment unit to a certain range when attaching the work.
9. The method of claim 8,
The stopper is a front work machine attachment device for a multipurpose transport vehicle, characterized in that when the movable member of the power connection device is retracted in association with the attachment of the work machine, the lifting and lowering of the movable member is limited to a predetermined height.

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