JPH09216795A - Support device for boom tip hanging article on high lift working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the enlargement of the amplitude of a hanging article and the elongation of time until the end of vibration in the case where an article hanging from a boom tip part vibrates during traveling. SOLUTION: In a high lift working vehicle where a high lift working hanging article 3 is pivotally attached to a boom tip part, the high lift working vehicle has such a telescopic structure as a movable side member 50 can slide to a fixed side member 40 as a damper 4 interposedly provided between a rigid structure such as a car body or a boom 2 and the hanging article 3, and moreover adopts a hydraulic damper having such a structure as shock absorbing action is generated only in a compression direction by oil pressure and elongating action is generated by a built-in spring. In addition, the vibration and amplitude generated during traveling of the hanging article 3 is effectively damped by providing the movable side member 50 of the damper 4 so as to be free in touching and separating to either of a rigid body structure side and a hanging article side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aerial work vehicle having a boom mounted on a vehicle body and a body for aerial work such as a cabin, a bucket, a deck, and a manipulator attached to the tip of the boom. The present invention relates to a support device for a boom tip body mounted on such an aerial work vehicle.

[0002]

2. Description of the Related Art This type of aerial work vehicle supports an aerial work body such as a cabin, a bucket, a deck, and a manipulator at the tip of a boom mounted on the vehicle body by an attitude maintaining member, The body is configured to be pivotable within the boom relief surface. The posture maintaining member has a post for supporting the body, a pin for pivotally attaching the post to the tip of the boom, a posture holding cylinder for holding the posture of the body in a horizontal posture, and the like. Therefore, in this type of aerial work vehicle, the body is supported by the boom tip portion at two points, that is, pivotal attachment by a pin and connection by a posture holding cylinder. By the way, although a hydraulic cylinder is used as the attitude holding cylinder, the hydraulic cylinder has elasticity, albeit a slight amount, even in a hydraulically locked state. Also, while the boom is retracted, the bodywork is also moved downward, but even in the boom retracted state, the bodywork is located at a considerably high position on the vehicle body (for example, the highest part of the bodywork is 3.5 It is located at a height of about m, and the center of gravity of the bodywork increases accordingly.

Therefore, in this type of aerial work vehicle, when there is a large unevenness on the road surface when the vehicle is running, the bodywork is large vertically or horizontally with respect to the boom tip end against the supporting force of the posture maintaining cylinder. Even when swinging or turning a curve, the bodywork swings largely left and right with respect to the boom tip. As described above, when the bodywork shakes significantly up and down or left and right during traveling, the dynamic load applied to the mounting portion of the bodywork increases, the wear degree of the mounting portion increases, and balance fluctuations occur. There is a problem that it becomes difficult to drive the vehicle.

By the way, there is a conventional aerial work vehicle in which a body (for example, a bucket) is elastically supported from below by a gas spring when the boom is stored. This gas spring has a function of elastically supporting the above-mentioned mounting body from below when the above-mentioned mounting body vibrates up and down, and alleviating the impact due to the vibration of the mounting body.

[0005]

However, as in the above-mentioned conventional example, when the body of an aerial work vehicle is elastically supported from below by gas springs, the following (1) and (2) Had a problem.

(1) First, although the gas spring exerts a cushioning action against the vibration (impact load) of the bodywork, the gas spring has a relatively low vibration absorbing ability, and when the bodywork vibrates. Its initial amplitude becomes quite large.
Therefore, the degree of wear of the bodywork connecting portion (the posture maintaining member) increases, and the balance fluctuation during traveling increases, which makes it difficult to perform traveling operation.

(2) Further, after the vibration of the bodywork occurs, the amplitude of the bodywork is gradually attenuated by the spring function (elastic force). Will take a long time to finish.
In particular, when traveling on a road with poor road surface conditions, vibrations frequently occur in the bodywork. However, if the vibration end time for each vibration becomes long each time the vibration occurs, the bodywork will not be supported during traveling. The total time during which the equipment vibrates becomes long, and the posture maintaining member for supporting the bodywork takes a long time,
The durability period of the posture maintaining member is shortened. Further, if the strength is increased in order to prolong the durability of the posture maintaining member, the weight will increase.

As a means for preventing the bodywork from vibrating, the bodywork and a rigid body structure portion such as a vehicle body or a boom are supported by a rigid body support such as a rod or a hydraulic cylinder when the boom is stored. It is conceivable to connect them, but in that case, each time the boom is changed between the use position and the storage position, the rigid support and the body (or the rigid structure part such as the vehicle body) are connected.
It is necessary to connect and disconnect the and, and the work is complicated.

In view of the above-mentioned conventional problems, the invention of the present application supports the boom tip body of a work vehicle for aerial work, which can effectively reduce the vibration of the body when traveling. The purpose is to provide a device.

[0010]

The present invention has the following structure as means for solving the above-mentioned problems.

First, in an aerial work vehicle used in the present invention, a boom is mounted on a vehicle body so that the boom can be raised and lowered, and a body for aerial work is supported by a posture maintaining member at the tip of the boom. It is configured. The bodywork includes cabins, buckets,
A deck, manipulator, etc. can be adopted. The posture maintaining member has a post for mounting the body, a pin for pivotally attaching the post to the boom tip portion, a posture holding cylinder for holding the posture of the body in a horizontal posture, and the like.

In this type of aerial work vehicle, the body at the tip of the boom is pivotally attached to the tip of the boom with a pin so that the body can swing back and forth within the boom undulation surface. Further, in this aerial work vehicle, an attitude holding cylinder is provided between the boom and the body, and the attitude holding cylinder is extended / contracted in accordance with the boom hoisting angle so that the body is always leveled. You can maintain your posture. The boom is capable of turning horizontally with respect to the vehicle body, and a telescopic boom may be adopted as the boom.

In the support device for the boom tip body of the present invention, the body body is placed on the rigid body structure portion between the rigid body structure portion such as the vehicle body or the boom and the boom body tip portion in the boom retracted posture. There is a shock absorbing damper to support it. In the present invention, the damper is provided between the vehicle body and the bodywork,
Alternatively, it may be provided anywhere between the boom and the bodywork.

The damper has an expanding / contracting structure in which the movable member can slide with respect to the fixed member, and the shock absorbing action is generated only in the compression direction by the hydraulic pressure, and the expanding action is performed by the built-in spring. A hydraulic damper with a generating structure is used. That is, this damper has a one-sided effect only in the compression direction, and when the compression force is released, it immediately expands due to the urging force of the built-in spring.

In this damper, the fixed side member is fixed to either the rigid body structure (vehicle body or boom) side or the body side, and the movable side member is fixed to the rigid body structure side or the body side. It is installed so that it can be moved in and out of connection with the other. That is, in the present invention, the fixed member of the damper is fixed to the rigid structure side and the damper is installed upward (the movable member of the damper is on the upper side), or the fixed member of the damper is mounted on the body. The damper can be installed facing downward (the movable side member of the damper is on the lower side), and the movable side member of the damper can be brought into contact with or separated from the bodywork or the rigid structure. It is installed freely. still,
When the boom is in the retracted posture and the body is maintained in the horizontal posture, the tip of the movable member of the damper is brought into pressure contact with the body side or the rigid structure side.

Further, according to the present invention, the body is positioned above the axis center line of the boom in the boom retracted posture, and at least two dampers are used to attach the dampers to the left and right sides of the center axis of the boom. You may make it arrange | position to it. In this case, the center position of the bodywork in the left-right direction does not necessarily have to overlap above the axial center line of the boom, and the dampers arranged on the left and right sides are not necessarily located equidistant from the axial center part of the boom. No need.

Further, in the present invention, the tip end surface of the movable member of the damper can be made spherical. The reason why the tip end surface of the movable side member is spherical is as follows. That is, when the body structure vibrates with respect to the rigid structure portion, the tip end surface of the movable side member and the abutting surface (for example, the lower surface of the body structure) with which the movable side member abuts are displaced in the horizontal direction and both of them are displaced. The abutting angle of the abutting surface will be changed.
At this time, if the tip end surface of the movable side member is made spherical, the abutting position of the opposite side surface will be displaced while rolling along the spherical surface. It is possible to prevent rubbing of the part. Further, if the tip end surface of the movable member is spherical, when the body object vibrates, even if the body object tilts back and forth or left and right to the maximum allowable range, the tip corner portion of the movable member is mounted. It is possible to prevent contact with an object (or a rigid structure).

Further, in the present invention, the damper may be provided with a display portion for displaying the degree of expansion / contraction of the movable side member with respect to the fixed side member. The display unit may be any one that allows the outside to visually check whether or not the fixed-side member and the movable-side member have a predetermined positional relationship (predetermined expansion / contraction length relationship), for example, a match mark or a scale. Can be adopted.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. First Embodiment of the present invention will be described with reference to FIGS. 1 to 5, and Second Embodiment of the present invention will be described with reference to FIGS. And a support device for a boom tip body in an aerial work vehicle according to the third embodiment.

In the aerial work vehicle of the first embodiment shown in FIGS. 1 to 5, the swing post 6 is mounted on the subframe 11 of the vehicle body 1, and the base end of the boom 2 is attached to the upper end of the swing post 6. It is pivotally attached.

The base end of the boom 2 is connected to the swivel post 6 with a pin 20 with high strength. Therefore, the boom 2 has a rigid structure together with the subframe 11 of the vehicle body 1. In the following description, the vehicle body 1 or boom 2
May be expressed as a rigid body structure section Y.

As the boom 2, a telescopic boom is adopted. The boom 2 is raised and lowered by a hoisting cylinder 7. In this embodiment, the turning post 6 is attached to a position closer to the front part of the subframe 11 of the vehicle body so that the tip end side of the boom faces the rear of the vehicle body 1 when the boom is stored. The post 6 may be attached to a position near the rear portion of the subframe 11 of the vehicle body so that the tip end side of the boom faces the front of the vehicle body 1 in the boom retracted state.

At the boom tip portion 21, a body 3 for working at a high place is supported by a posture maintaining member. The posture maintaining member includes a post 31 for mounting a body, a pin 30 for pivotally attaching the post 31 to the boom tip portion 21, and a posture holding cylinder 8 for holding the posture of the body 3 in a horizontal posture.
Etc. Also, in this embodiment, as the body 3, the swivel base 32 mounted on the upper part of the post 31, the cabin 33 and the mount base 34 mounted on the upper part of the swivel base 32, and the winch device 35 mounted on the upper part of the mount base 34. And a manipulator 36. Then, the body 3 is swingable back and forth within the undulating surface of the boom 2 by pivotally attaching the post 31 to the boom tip 21 with the pin 30. Further, in this embodiment, when the boom is stored, as shown in FIG. 2, when viewed from the rear of the work vehicle, it passes through the center of gravity G of the body 3 and the pivot portion (pin 30 portion) of the boom tip 21. While the line Q (hereinafter, referred to as the bodywork centerline Q) overlaps with the vertical line P (hereinafter, referred to as the boom shaft vertical line P) from the axis centerline of the boom 2, It is located on the boom 2. In addition, in another embodiment, the body 3 can be installed on the boom 2 in a state where the body centerline Q is eccentric to the left and right with respect to the boom axis vertical line P. Of course.

An attitude holding cylinder 8 is provided between the boom tip 21 and the body 3. The posture holding cylinder 8 is expanded and contracted in conjunction with the boom hoisting cylinder 7 to keep the cabin 33 in a horizontal posture at all times in response to changes in the hoisting angle of the boom 2.
It should be noted that the cabin 33 is initially adjusted so as to be horizontal when the boom is stored in the retracted state shown in FIG. 1. However, when the cabin 33 is used for a long period of time, for example, a pivot portion, a hydraulic cylinder, or the like is used. There is a case where the cabin 33 is used with its tilted state due to a change with time.
In this case, conventionally, by finely adjusting the valve for the posture holding cylinder 8 while visually measuring the posture of the cabin 33,
I am trying to correct the cabin attitude. However, it is difficult to change the posture accurately by adjusting the cabin posture by visual inspection.

When the aerial work vehicle of this embodiment is used for aerial work, the operator operates the swing post 6 from the inside of the cabin 33, and the boom 2 is lifted and retracted while the outrigger 5 is grounded. Then, the body 3 is moved to the work position. At this time, the boom hoisting cylinder 7
The posture holding cylinder 8 also expands and contracts in association with the degree of expansion and contraction (boom undulation degree), so that the cabin 33 is always maintained in a horizontal attitude regardless of the boom undulation angle. Then, from inside the cabin 33, the winch device 35, the manipulator 36, and the like are operated to perform a predetermined work at a high place.

When the aerial work vehicle is allowed to travel, the boom 2 is stored on the vehicle body 1 as shown in FIG. In this boom retracted state, the tip end of the base boom is abutted and pressed against the abutting body 14 on the sub-frame 11 of the vehicle body 1 so that the boom 2 does not rattle up and down. Abutting plates 33a and 33a are attached to the lower surfaces of the left and right sides of the rear end portion of the cabin 33 at positions corresponding to abutting members 55 and 55 of dampers 4 and 4 to be described later when the boom is stored.

By the way, in this type of aerial work vehicle, when the body 3 vibrates up and down or left and right with respect to the boom tip portion 21 during traveling, a support portion (pin 8) for the body 3 is provided.
A large stress is generated in the portions a and 30).
In particular, in the aerial work vehicle of this embodiment, since the bodywork 3 has a considerably large weight, if the bodywork 3 shakes greatly during traveling, the degree of wear of the mounting portion of the bodywork will be reduced. As the size increases, it becomes difficult to drive the vehicle due to the balance fluctuation.

In order to solve such a problem, FIG.
In the aerial work vehicle of the first embodiment shown in FIG. 5, the body 3 is supported on the body 1 in a boom retracted state between the body 1 (which is the rigid structure Y) and the body 3. A damper 4 for absorbing shock is provided. In this embodiment, as shown in FIG. 1, the damper 4 is separated from the boom tip portion 21 and the pivotal attachment portion (pin 30 portion) of the body 3 in the vehicle body front direction by a considerable distance (for example, about 1.5 m). In addition, as shown in FIG. 2, one unit is installed on each of the left and right sides of the boom axis vertical line P (two units in total).

As shown in FIG. 3, each of the dampers 4 and 4 is a hydraulic damper having a telescopic structure in which the movable member 50 can slide with respect to the fixed member 40.

The fixed member 40 has a double-tube structure in which a cylinder 42 is provided inside a cylinder 41. The cylinder 41 and the cylinder 42 have the head housing 4 on the lower side thereof.
5A and the rod housing 45B on the upper side. Inside the cylinder 42 is a piston chamber 43, and between the cylinder 42 and the cylinder 41 is an annular chamber 44. An annular accumulator 48 is housed in the annular chamber 44. The piston chamber 43 and the annular chamber 44 are communicated with each other through the oil feed passage 46 on the lower side and the return oil passage 47 on the upper side. A needle valve 46a is provided in the oil feed passage 46.
A check valve 47a is provided in the return oil passage 47 (return oil passage of the piston 53 portion).

On the other hand, the movable member 50 includes a guide tube 52.
, Piston 53 and piston rod 54, and abutment 5
Five. The guide cylinder 52 slides along the outer surface of the cylinder body 41 of the fixed-side member 40. The abutment body 55 is fixed to the upper end portion of the guide cylinder 52 by bolting. The upper part of the abutment body 55 projects upward from the upper surface of the guide cylinder 52, and the upper surface of the abutment body 55 is a spherical surface 56. The piston rod 54 is guided by the rod housing 45B with its upper end connected to the center of the lower surface of the abutting body 55. The piston 53 slides up and down in the piston chamber 43.

A spring 51 for pushing up the movable member 50 is provided between the rod housing 45B and the abutting member 55 in the guide cylinder 52.

The damper 4 operates as follows. First, the movable side member 50 with respect to the fixed side member 40
When is pushed down, the pressure in the piston chamber 43 becomes high due to the piston 53, and the hydraulic oil A in the piston chamber 43 is delivered into the annular chamber 44 through the delivery passage 46 which is narrowed by the needle valve 46a. At this time, the hydraulic oil A on the piston chamber 43 side is sent to the annular chamber 44 side through the narrow delivery passage 46, so that the pressing force for the movable member 50 is absorbed by the hydraulic oil pressure in the piston chamber 43. Like When the pressing force on the movable member 50 is released, the spring 5
The urging force of 1 immediately moves the movable member 50 upward. At this time, the check valve 47a of the piston 53 part
Is opened, and the hydraulic oil on the upper side of the piston flows back into the piston chamber 43 below the piston through the return oil passage 47. As described above, in the damper 4, the shock absorbing action is generated only in the compression direction, and the extending action is achieved by the spring 51.

In this embodiment, the damper 4 having the above structure is used.
1 to 3, each of the dampers 4 and 4 is located at a position corresponding to the lower surface (abutment plate 33a, 33a) on the left and right sides of the rear end of the cabin 33 in the boom retracted state, as shown in FIGS. In the above, it is installed vertically on the vehicle body 1 side. That is, each of the dampers 4 and 4 is mounted on the sub-frame 11 of the vehicle body 1 with the fixed member 40 on the lower side.
It is erected and fixed via 3,13.

In each of the dampers 4 and 4, the movable side member 50 is fully extended in the non-compressed state (the non-contact state of the cabin 33), and the abutting body 55 at the upper end thereof is shown by a chain line in FIG.
It moves up to the position of 5 '). Then, as shown in FIGS. 1 to 3, in the boom retracted state (the cabin 33 is in the horizontal posture), the abutting plates 3 on the cabin 33 side are provided.
3a and 33a press the upper surfaces of the abutting bodies 55 and 55 of the dampers 4 and 4, and hold the movable side members 50 and 50 in a state of being pressed down by a predetermined small height.

Further, each of the dampers 4 and 4 is provided with a display section 49 for displaying the degree of expansion / contraction of the movable member 50 with respect to the fixed member 40 to the outside. This display section 49
Has a function of checking whether or not the cabin 33 is maintained in the normal posture (horizontal posture) in the boom retracted state. In this embodiment, the display unit 49 has
As a result, a matching mark is provided on the outer surface of the cylindrical body 41 of the fixed member 40. That is, the alignment mark 49 is positioned so that the lower end edge of the guide cylinder 52 of the movable member 50 corresponds to the upper end of the alignment mark 49 when the cabin 33 is maintained in the horizontal posture in the boom retracted state. There is. still,
The cabin 33 is initially adjusted so as to be in a horizontal posture in the boom retracted posture shown in FIG. 1. However, for example, the pin pivot portion, the posture holding cylinder (hydraulic cylinder) 8 and the like are distorted due to aging, and The cabin 33 may be used in a tilted state. In this case, the lower end edge of the guide cylinder 52 is displaced from the alignment mark 49 in the boom retracted state. Therefore, when the damper 4 with the display unit 49 is used, the levelness of the cabin 33 can be confirmed by looking at the display unit 49 when the boom is stored. Further, when the levelness of the cabin 33 is out of order, the cabin attitude can be corrected by finely adjusting the valve for the attitude holding cylinder 8 while looking at the display portion 49, and the cabin attitude can be adjusted as in the conventional case. This can be done more accurately and easily than adjusting work while visually measuring the posture.

In the boom tip body support device of the first embodiment, the movable side members 50, 50 of the dampers 4, 4 are arranged.
Since it butts against the cabin 33 so that it can freely come into contact with or separate from the cabin 33, even when the shock absorbing damper for the bodywork is provided, when the boom 2 is raised from the retracted state or when the boom 2 is boomed. No special work (for example, work for releasing the connection between the damper 4 and the cabin 33) is required when the storage device is in the upright position.

When the aerial work vehicle of the first embodiment is run, it is carried out in the boom retracted state shown in FIG.
At this time, if there is a large unevenness on the traveling road surface, the body 3 will be opposed to the support force of the posture maintaining cylinder 8 and the boom tip 21 will
It may vibrate up and down. And bodywork 3
When the rear side of the body 3 swings downward, the rear end of the body 3 pushes the movable side members 50, 50 of the dampers 4, 4 downward. Since the structure is such that the pressing force can be absorbed by the oil pressure in 43, it is compressed to a certain extent as shown in FIG. 4, but the downward movement width of the body 3 is reduced as compared with the support by the spring. Can be made. Also, each damper 4,
No. 4 is in a free state on the extension side due to one-way effect in the compression direction, and the movable-side member 50 is urged toward the extension side by the spring 51 with a built-in damper, so that the body 3 is moved downward. When the movable side member 50 follows the bodywork 3 and moves up when the bodywork 3 moves up by reaction afterwards, the pressing force when the bodywork 3 moves down again can be absorbed by the hydraulic pressure. It has become. Therefore, when the body 3 vibrates up and down, the amplitude can be reduced and the vibration can be terminated in a very short time. Further, when the body 3 vibrates, the movable-side member 50 of the damper 4 follows the body 3 so that an impact load is generated on the damper 4 when the body 3 moves down again. do not do.

Further, when the vehicle bends a curve during traveling, as shown in FIG. 5, the body structure 3 becomes swingable to the left and right with respect to the boom tip portion 21 (for example, as shown in FIG. The center line Q of the equipment has an angle with the vertical line P of the boom axis). However, as in the first embodiment,
If the body 3 is supported from the left and right sides of the boom 2 by the two dampers 4 and 4, the lateral swing of the body 3 can be absorbed by the dampers 4 and 4 on the respective sides. Like the vertical vibration, the amplitude can be reduced and the vibration can be terminated in a very short time. As described above, when the vertical and horizontal amplitudes of the body 3 can be reduced and the vibration time of the body 3 can be shortened during traveling, the mounting portion of the body 3 (the posture maintaining member described above) can be reduced. ), The degree of wear can be reduced, and running operation becomes easier.
When only one damper 4 is used, the damper 4 is installed near the left and right center of the body 3, but as in this embodiment, two dampers 4 are used. , And when it is installed so as to be spaced apart from each other on the left and right sides of the boom 2, even if the action of twisting the post 31 to the left and right occurs, the action of twisting the two dampers 4, 4
Can be effectively absorbed by 4. Also, like this, damper 4
When two units are used, the impact load generated when the body 3 is vibrated can be received at two places, so the damper abutment portion (eg, abutment plate 33a) on the body 3 (cabin 33) side.
The degree of damage can be reduced, and the strength of the damper abutting portion may be reduced as compared with the case of supporting at one location by one damper. If you use two dampers 4 and 4,
The shock absorption capacity per unit can be reduced and an inexpensive damper can be used. Further, as in this first embodiment,
When the movable side member 50 of the damper 4 is directed upward and the upper end surface of the movable side member 50 is abutted against the lower surface of the cabin 33, vibration is generated in the body structure 3 and the body structure 3 tilts. Even in such a case, there is almost no effect of twisting the damper 4, and the damper 4 can be protected.

When the bodywork 3 vibrates vertically or horizontally as shown in FIG. 4 or 5, the cabin 33 (abutting plate 33a) tilts back and forth or left and right, and the movable side member 50 of the damper 4 moves. The abutting position of the movable side member 50 changes with respect to the front end surface thereof, but if the front end surface of the movable-side member 50 is a spherical surface 56, the following operation is obtained. That is, the movable member 5
If the front end surface of 0 is made spherical surface 56, the abutment position of the abutment plate 33a of the cabin 33 will be displaced while rolling along the spherical surface 56, whereby the range of displacement will be both abutting. Prevents rubbing on the part. Therefore, it is possible to reduce the wear of the abutting portions. Further, if the tip end surface of the movable member is a spherical surface 56, even if the body 3 vibrates and the body 3 tilts back and forth or left and right to the maximum permissible range, the corners of the tip end surface of the movable member 3 will be affected. Since the lower surface of the cabin 33 does not come into contact with each other, it is possible to prevent abrasion or damage of the abutting portion of the other side due to rubbing of the corner portion.

In the boom tip support device of the second embodiment shown in FIG. 6, two dampers 4 are supported on the left and right side surfaces of the boom 2. That is, in this second embodiment, the same hydraulic damper as that of the first embodiment is used as each damper 4, and the fixed side member 40 of each damper 4 is attached to each side surface of the boom 2. It is fixed to a pair of supports 15. Then, the spherical surface 56 of the upper end portion 55 of the movable member 50 of each damper 4 is attached to the cabin 33.
An abutment eave 37 (a pair or a continuous long one) provided on the rear surface is abutted from below. Boom 2
Has a high rigidity because it hardly vibrates with respect to the vehicle body 1, and even when the damper 4 is attached to the boom 2 in this manner, the same damper function as that of the first embodiment can be achieved. The rest of the configuration of the second embodiment is similar to that of the first embodiment.

In the boom tip body support device of the third embodiment shown in FIG. 7, the two dampers 4 are attached to the boom axis vertical line P (see FIG. 2 or 5) at the rear end of the cabin 33. It is attached in a state of straddling left and right. That is, in the second embodiment, the fixed member 40 is fixed to the support 16 provided at the rear end of the cabin 33 with the fixed member 40 facing upward. Also in this case, the tip end surfaces (lower end surfaces) of the movable side members 50 of both dampers 4 abut against each abutting body 22 on the boom 2 side in the boom retracted state. Even in the case of this third embodiment, it is almost the first
A damper function similar to that of the embodiment or the second embodiment can be achieved. The other configurations of the third embodiment are the same as those of the first embodiment.
This is the same as that of the embodiment.

Further, as another embodiment of the present application, the following can be made. That is, only one damper 4 can be used. In that case, the damper 4 is the bodywork 3
Left-right intermediate position (near the body center line Q in Fig. 2)
It is preferable to install it. In that case, since only one damper 4 is used, the configuration of claim 2 of the present application cannot be adopted. Further, the bodywork 3 attached to the boom tip portion 21 can be positioned beside the boom 2 in the boom retracted state. Also in this case, the configuration of claim 2 of the present application cannot be adopted. Furthermore, a bucket or a deck can be adopted as the bodywork 3, and only the manipulator may be adopted. Further, in this case, the body 3 is
In the retracted state of the boom, it may be located directly above the boom 2 or may be located laterally of the boom 2. Further, as the display unit 49 for displaying the expansion / contraction degree of the damper 4, in addition to the one-point matching mark of this embodiment, a display having an appropriate display width in the vertical direction, or the expansion / contraction degree can be quantitatively displayed. It is also possible to adopt the scale and the like shown in.

[0044]

EFFECTS OF THE INVENTION The boom tip support device for aerial work vehicles of the present invention has the following effects.

Effect of the Invention of Claim 1 The rigid structure portion Y of the vehicle body 1 or the boom 2 and the boom tip portion 2
Since the hydraulic damper 4 is interposed between the body 3 attached to the vehicle 1 and the body 3, the vibration and amplitude of the body 3 generated during traveling due to the hydraulic pressure of the damper 4 can be effectively applied. It can be damped, the degree of wear of the mounting portion of the body 3 can be reduced, and the running operation can be facilitated.

Further, since the damper 4 has a one-sided effect only in the compression direction and has a structure in which it is extended by the built-in spring 51, the reaction after the damper 4 is compressed by the body 3 is adopted. When the bodywork 3 moves upward,
The movable member 50 of the damper 4 comes to follow the body 3, and when the body 3 moves down again, no impact load is generated on the damper 4, and the abutting part or the body It becomes difficult to damage the mounting portion of 3 and the like.

Further, the damper 4 has a movable member 5
Since 0 is installed in the rigid body structure Y side or the body 3 side so that it can freely come into contact with and separate from the rigid body structure part Y side or the body structure 3 side, when the boom 2 is raised from the retracted state, or when the boom 2 is retracted from the boom raised state. , Special work (eg damper 4 and cabin 3
No connection or disconnection work with 3) is required.

At least two dampers 4 according to the invention of claim 2 are used, and each damper 4, 4
Are located on the left and right sides of the axis center of the boom 2,
Even when the bodywork 3 vibrates left and right during traveling, the left and right vibrations can be effectively absorbed. This makes it possible to effectively reduce the twisting action even when the action maintaining member supporting the body 3 is twisted in the left-right direction. Further, by using two dampers 4 as described above, the impact load generated when the body 3 is vibrated can be received by the two dampers, so that the impact absorbing capacity per unit can be reduced and the cost is low. Dampers can be used. Further, by using the two dampers 4 and 4 as described above, it is possible to reduce the degree of damage to the portion (opposite side abutment portion) where the damper tips abut and come apart freely, and the other side abutment is performed. The strength of the portion can be reduced (the reinforcing structure can be simplified). This is particularly effective when the movable side members 50, 50 of the damper can be brought into and out of contact with the body 3 side.

Effect of the Invention of Claim 3 When the body 3 vibrates, the tip surface of the movable member 50 of the damper 4 and the abutting surface of the opposite side (body 3 side or rigid body structure Y).
The abutting position with the side abutting surface) changes, but since the distal end surface of the movable side member 50 is a spherical surface 56, the abutting position is displaced along the spherical surface 56 while rolling. Becomes
It is possible to prevent rubbing on both abutting surfaces in the displacement amount range. Therefore, it is possible to reduce the wear of the abutting portions.
Further, when the tip end surface of the movable member is spherical surface 56, even if the body 3 vibrates and the body 3 tilts back and forth or left and right to the maximum allowable range, the tip end surface of the movable member 3 Since there is no contact with the mating abutment surface, it is possible to prevent abrasion or damage of the mating abutment surface due to rubbing of the corners.

In the damper 4 according to the invention of claim 4, the movable side member 50 with respect to the fixed side member 40 is provided.
Since the display unit 49 for displaying the degree of expansion and contraction is provided, whether or not the posture of the bodywork 3 is normal in the boom retracted state can be confirmed by looking at the display unit 49. Correction when the posture of the
Since it can be performed while looking at 9, the correction work can be performed easily and accurately.

[Brief description of drawings]

FIG. 1 is a side view of an aerial work vehicle including a boom tip body support device of a first embodiment of the present application.

FIG. 2 is an enlarged sectional view taken along the line II-II of FIG.

FIG. 3 is an enlarged sectional view taken along the line III-III of FIG. 2;

FIG. 4 is a state change diagram of FIG. 3;

FIG. 5 is a state change diagram of FIG.

FIG. 6 is a partial side view of an aerial work vehicle equipped with a support device for a boom tip body according to the second embodiment of the present application.

FIG. 7 is a partial side view of an aerial work vehicle equipped with a boom tip body support device of a third embodiment of the present application.

[Explanation of symbols]

1 is a car body, 2 is a boom, 3 is a bodywork, 4 is a damper, 5
Is an outrigger, 6 is a swivel post, 7 is an undulating cylinder, 8
Is a posture holding cylinder, 11 is a frame, 12 is a subframe, 20 is a pin, 21 is a boom tip, 30 is a pin,
33 is a cabin, 40 is a fixed member, 49 is a display unit, 5
Reference numeral 0 is a movable member, 55 is an abutting member, 56 is a spherical surface, A is hydraulic fluid, and Y is a rigid structure.

Claims (4)

[Claims] 1. A boom (2) is mounted on a vehicle body (1) so that the boom (2) can be raised and lowered, and a body (3) for working at high places is mounted on a tip end portion (21) of the boom (2) by a posture maintaining member. A supported aerial work vehicle, comprising a rigid structure (Y) such as the vehicle body (1) or boom (2)
A shock absorbing damper (4) for supporting the body (3) on the rigid structure (Y) in a boom retracted position, between the body and the body (3), The damper (4) has an expanding and contracting structure in which the movable member (50) can slide with respect to the fixed member (40), and the shock absorbing action is generated only in the compression direction by the hydraulic pressure and the built-in spring. (51) adopts a hydraulic damper having a structure for generating an extension action, and in the damper (4), the fixed side member (40) is attached to the rigid structure (Y) side and the bodywork (3). While fixed to either one of the two sides, the movable side member (50) is installed so as to be able to come into contact with and separate from the other of the rigid body structure (Y) side and the bodywork (3) side. Boom point in high-altitude work vehicles characterized by Support apparatus of KaSobutsu. 2. The body (3) is positioned above the axis center line of the boom (2) in the boom retracted position, and at least two dampers (4) are used to provide the dampers (4, 4). 2. The boom tip body support device for an aerial work vehicle according to claim 1, wherein the booms are arranged on the left and right sides of the axis center of the boom. 3. A movable member (5) of the damper (4).
The support device for the boom tip body in aerial work vehicles according to claim 1 or 2, wherein the tip surface of (0) is a spherical surface (56). 4. The fixed member (40) is attached to the damper (4).
4. A boom tip body structure for an aerial work vehicle according to any one of claims 1 to 3, further comprising a display section (49) for displaying a degree of expansion and contraction of the movable side member (50). Support device.