JP2001151470A - Counter weight for working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a counter weight of optimum weight without manufacturing an individual counter weight for every constitution and specification of a vehicle and without changing external appearance of the vehicle. SOLUTION: A counter weight 20 is constituted of a counter weight main body 21 which is mounted on a vehicle body and forms an external appearance surface 21a and counter weights for adjusting weight (an A weight 22, a B weight 23) which are mounted on the back surface side of the counter weight main body 21. As for the A weight 22 and B weight 23, a proper disposing number and combinations are free according to the constitution of the vehicle. In the B weight, an engagement hole 23a is formed and is locked on the weight main body 21 by a fixing pin 24. Because the back surface 21b is mounted toward the inside of the vehicle body in the counter weight 20 constituted in this way, the A, B weights are not exposed at mounting attitudes in an external appearance view.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a counterweight which is attached to a work vehicle and is used for maintaining a vehicle body balance during work of the work vehicle, adjusting the center of gravity of the work vehicle (adjusting the weight distribution), and the like.

[0002]

2. Description of the Related Art A counterweight (also referred to as a balance weight) as described above includes, for example, a boom freely swinging, raising and lowering, bending and extending on a vehicle body, and a working device attached to the tip of the boom. It is used in many work vehicles such as forklifts, bulldozers, aircraft tow trucks, as well as work vehicles such as aerial work vehicles, crane vehicles, ground excavation vehicles, etc., which operate by operating a boom. .

[0003] Such a counterweight has a function of balancing the force that the vehicle body receives from the working device, the moving object, and the like during work. For this reason, if the counterweight is too light, it does not fulfill its original function as a weight, and if it is too heavy, it becomes inefficient. Therefore, it is necessary to create and attach counterweights having different weights for each model according to the configuration and specifications of the vehicle, even if the working vehicle is of the same type (for example, a series machine).

In addition, instead of creating individual counterweights for each model as described above, a minimum counterweight for a small machine in a work vehicle of the same type is created as a common part in a series, and a specification is used for a large machine. In some cases, additional weights are stacked and connected to the outside of the counterweight by screwing or the like and used.

[0005]

However, if counterweights having different weights are created and used for each model, the counterweights are generally manufactured by sand casting, but different wooden molds are used for each model. It is necessary to create and wipe different castings according to the production plan for each model, and it is a factor that increases costs because all subsequent processing, assembly, and management processes are handled by each model. Until recently, there is a problem that the production process is inevitably complicated.

On the other hand, in a system in which additional weights are stacked on a common counterweight having the minimum weight, compared to the system in which individual counterweights are created as described above, the production process is simplified by sharing manufactured parts, and the cost reduction effect is reduced. It can be said that it has. However, the counterweight of the work vehicle is often attached to the outermost periphery of the vehicle body in order to efficiently perform the necessary balance function within the limited body size, and it is easily visible in appearance. There is. For this reason, it is not preferable from the viewpoint of the design value of a product that the number of weights to be stacked differs due to a slight specification difference and the appearance changes even though the series machines are almost the same in appearance.

The present invention has been made in view of the above-mentioned problems, and does not complicate the production process as in the individual counter weight system, and also provides a method in which additional weights are externally stacked. Without changing the appearance
It is an object of the present invention to provide a counterweight capable of performing weight adjustment according to the specifications of a model.

[0008]

In order to achieve the above object, according to the present invention, there is provided a first counterweight (for example, the counterweight body 21 in the embodiment) which is attached to a vehicle body and is exposed on an exterior surface of the vehicle body; The first counterweight is detachably attached to the first counterweight to form an integral counterweight, and a second counterweight (for example, in the embodiment) disposed inside the vehicle body when the first counterweight is mounted to the vehicle body. A weight 22 and a B weight 23), which adjust the weight by attaching and detaching the second counterweight according to the configuration of the work vehicle, and configure the counterweight of the work vehicle.

According to the above configuration, the first counterweight is appropriately set to the second counterweight so as to have a required weight according to the specifications of the model.
The counterweight can be attached and detached, and the integrated counterweight can be attached to the vehicle body. Since the second counterweight is disposed inside the vehicle body in the mounting posture, the appearance of the vehicle body does not change. Therefore, there is no need to separately manufacture large counterweights for each vehicle configuration and specification, and without changing the external shape.
It is possible to provide a counterweight capable of adjusting the weight according to the specifications of the model.

The second counter weight is composed of a plurality of second counter weights (for example, the A weight 22 and the B weight 23 in the embodiment), and the number of the second counter weights is determined according to the configuration of the work vehicle. Can be increased or decreased to configure the counterweight of the work vehicle. According to such a configuration, in a large number of sister machines and series machines having slightly different specifications, the first counterweight has an appropriate number of second counterweights so as to have a necessary counterweight weight according to the specifications of each model. The counterweight can be increased or decreased, and the integrated counterweight can be mounted on the vehicle body. Since the second counterweight is arranged inside the vehicle body in the mounting posture, the appearance of the vehicle body does not change regardless of the number of the second counterweight mounted. Therefore, there is no need to separately manufacture large counterweights for each vehicle configuration and specification, and it is possible to make fine weight adjustments to the specifications of many models without changing the appearance of the vehicle. Can be provided.

The first counter weight and the second counter weight have an engagement hole, and the second counter weight is a rod that is engaged with the engagement hole of the first counter weight and the second counter weight to be locked. It may be configured to be attached to the first counterweight by a member (for example, the fixing pin 24 in the embodiment). According to such a configuration, it is possible to easily and collectively attach the second counter weights different for each model with a very simple configuration.

[0012]

Preferred embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a wheel-type self-propelled aerial work vehicle (hereinafter referred to as “aerial work vehicle”) as an example of a work vehicle provided with a counterweight according to the present invention. explain. The aerial work vehicle 1 is mounted on a traveling device 3 having a pair of left and right front and rear wheels 15a and 15b and configured to be able to travel by the operation of a traveling motor (not shown). A swivel table 4 that is configured to be capable of swinging in the horizontal direction is provided, and an upper end of the swivel table 4 is configured to be able to move up and down with respect to the traveling device 3 by the expansion and contraction operation of the up and down cylinder 12. Boom 5 is pivoted.

The boom 5 includes a base boom 5a, an intermediate boom 5b, and a distal boom 5c pivotally mounted on the swivel table 4. Each of the booms 5 is inserted into a telescope shape, and is provided with a telescopic cylinder (not shown). It is configured to be expandable and contractible by the operation of (illustration). At the tip of the boom 5, a vertical post 6 is provided which is always kept vertical regardless of the elevation angle of the boom 5 by the operation of a leveling cylinder (not shown).
A worktable 8 configured to be swingable around the vertical post by the operation of a swing motor provided on the vertical post 6.
Are arranged.

The work table 8 includes a vehicle driving operation and a boom 5.
An operation device 10 for performing the operation of the operation table is provided, and outputs a command signal corresponding to an operation command of an operator boarding the work table 8 to a hydraulic unit 16 provided on the swivel table 4. The hydraulic unit 16 generates hydraulic pressure by an engine-driven hydraulic pump, and supplies the generated hydraulic pressure to each hydraulic actuator of the vehicle based on an operation signal from the operation device 10.

Therefore, the operator who gets on the work table 8 operates the operation device 10 provided on the work table to move the aerial work vehicle 1 to a target site position.
The boom 5 can be swung, raised and lowered, expanded and contracted, and the like, whereby the worktable 8 can be moved to an arbitrary height to perform a desired work at a high place.

At the rear end of the turntable 4 of the aerial work vehicle 1 thus constructed, the boom 5 is moved up and down, turned and moved.
A counterweight 20 is provided for stabilizing the vehicle body against an overturning moment acting on the vehicle body to cause the vehicle body to overturn when the vehicle is extended or operated.

The counterweight 20 corresponds to II-II in FIG.
The direction shown by the arrow (the direction seen from the mounting surface side to the swivel 4)
2 is shown in FIG. 2, and the configuration is shown in FIG.
A counterweight body 21 attached to the swivel base 4 and exposed to the outside, and a counterweight 20 attached to the counterweight body 21 from the swivel base 4 side (hereinafter referred to as a “back side”) to form an integral counterweight 20 and to be viewed from the outside. It comprises a plurality of weight adjustment counterweights 22 and 23 that are not exposed.

The main body 21 of the counterweight is
Has an outer surface 21a formed in an arch shape so as to substantially coincide with the outermost arc of the turning radius when the turning table 4 is turned, and a plurality of weight adjusting counterweights 22 on the back surface 21b side. , 23 receiving grooves 21c, 2
1d and mounting holes for mounting these are formed. The counterweight main body 21 has a mounting surface, screw holes, and the like formed by machining after forming the entire outer shape by sand casting or the like. Hereinafter, when the mass of each counter weight in the present embodiment is described as a reference value, the mass of the counter weight main body 21 is about 2600 kg.

The counterweight for weight adjustment comprises a large A weight 22, a small B weight 23, a rod-shaped fixing pin 24 for locking the B weight to the counterweight body, and the like. The maximum extension length of the boom 5, the maximum loading weight of the worktable 8, the presence or absence of a winch device, and the configuration of the traveling device 3 (whether wheel type or crawler type)
The weight of the counterweight 21 is increased by appropriately increasing or decreasing the combination of the weights and the number of the weights to be used in accordance with, for example,
In each of the receiving grooves.

The large A-weight 22 is formed by casting or the like in the same manner as the counterweight 21, and has a mounting hole 22a formed in the A-weight 22 and a screw hole 21e formed in a boss on the bottom surface of the receiving groove 21c. It is fixedly disposed in the receiving groove 21c by being fastened using the bolt 32. The A weight 23 is a counter weight main body 21.
The receiving grooves 21c, 21c formed on the left and right of
It is configured so that a total of two pieces can be attached. The weight of the A weight in this embodiment is approximately
It is 600 kg.

The small B weight 23 is formed into a plate-like body as shown in FIG. 1 by casting, can-making of a thick plate, or the like, and penetrates the upper and lower surfaces of the plate-like body at a predetermined position from its end face. Engaging hole 23a is formed. In the upper and lower wall surfaces of the receiving groove 21d of the counterweight body 21, fixing pin mounting holes 21f and 21g are provided at positions corresponding to the engaging holes 23a.
Are formed, and when the B weights 23 are stacked in the receiving grooves 21d, the fixing pin mounting holes 21f to the engaging holes 23a to the fixing pin mounting holes 21g of the B weights are configured to communicate vertically. . Therefore, the required number of B weights are arranged in the receiving groove 21d, and the fixing holes 24 are used to penetrate these mounting holes and the respective engaging holes, so that the B weights 23, 23,. It can be locked easily and collectively.

Here, the B weight 23 in this embodiment is
Has a mass of about 100 kg per sheet, and is configured so that up to seven sheets can be attached. Therefore, B weight 2
By changing the number of sheets used in No. 3, fine weight adjustment that cannot be completely adjusted by the A weight 22 can be performed.
In addition, since the B weight is a plate having a simple shape,
Weights having different thicknesses and different materials can be easily created. Therefore, it is also possible to perform more fine weight adjustment by, for example, creating a B 'weight having a plate thickness of half.

As is clear from the above description, the weight of the counterweight 20 thus configured can be adjusted in a wide range by the number and combination of the A weights 22 and the B weights 23 for weight adjustment. For example, from the mass of each weight shown as a reference in this example,
The total weight of the counterweight 20 is from a minimum of 2600kg to a maximum
It can be changed in 100kg increments up to 4500kg. Further, by changing the thickness of the B weight and the like as described above, it is possible to perform more detailed adjustment.

Therefore, for example, the counterweight is reduced for a high work vehicle of a high lift and high load type, in which the maximum extension of the boom 5 is short and the lift is low and the load capacity is low. It is possible to arbitrarily set an optimum weight mass in consideration of the vehicle body balance, running efficiency, and the like according to the configuration and specifications of the aerial work vehicle 1 such as increasing the weight.

After the counterweight 20 having the mass set as described above is formed as an integral counterweight 20 as shown in FIG. 2, the counterweight 20 is attached to the swivel base 4 by bolts 31 through the mounting holes 21h from the external surface 21a side. Can be At this time, the A weight 22 and the B weight 23
Are disposed on the side of the mounting surface with the swivel table 4.
After being mounted on the turntable 4, the turntable 4 is disposed inside the vehicle body as shown by a dashed line in FIG. For this reason,
Even when the number of attachments and the combination of the weights are different, the attachment state is not exposed to the outside of the vehicle body, and forms the same appearance in appearance.

Therefore, it is possible to provide a counterweight having an optimum mass according to the specifications of the aerial work vehicle without any change in appearance, and to provide an aerial work vehicle having an enhanced design value in a series machine or the like. Obtainable.

In the above description, the counterweight according to the present invention is applied to an aerial work vehicle by way of specific mass. However, the present invention is not limited to this embodiment. Is clear. That is,
According to the technical idea of the present invention, the present invention can be similarly applied to other work vehicles as described in the section of the related art, and furthermore, the mass thereof can be widely varied from a lightweight and compact counterweight to a counterweight having a large mass size. It is possible to apply.

Further, in the above embodiment, an example has been described in which a plurality of A weights and a plurality of B weights are used as the second counter weight to constitute a counter weight that can be finely adjusted in a wide mass range. In the case where the number of models is small and several types of counterweights are sufficient, a single second counterweight having a single mass can be detachably provided on the back side of the first counterweight, or a second counter having a different mass can be provided. Select weight and 1
By arranging them individually and detachably, the same effect can be achieved within the range of the model configuration.

[0029]

As described above, according to the present invention, the first counterweight attached to the vehicle body and exposed to the exterior of the vehicle body, and the counterweight detachably attached to the first counterweight and integrated therewith. While
A second counterweight disposed inside the vehicle body when the first counterweight is mounted on the vehicle body, and attaching and detaching the second counterweight according to the configuration of the work vehicle to reduce the counterweight of the work vehicle. Constitute.
Therefore, there is no need to individually manufacture large counterweights according to the configuration and specifications of the work vehicle, and it is possible to provide a counterweight capable of performing weight adjustment without changing the external shape.

The second counter weight is composed of a plurality of second counter weights, and the number of the second counter weights can be increased or decreased according to the configuration of the work vehicle to form the counter weight of the work vehicle. . According to such a configuration, it is not necessary to separately manufacture a large counterweight for each vehicle configuration and specification in a large number of sister machines and series machines having slightly different specifications, and the appearance of the vehicle can be changed. In addition, it is possible to provide a counterweight capable of performing fine weight adjustment in accordance with the specifications of many models.

Further, the first counter weight and the second counter weight have an engagement hole, and the second counter weight has
The second counterweight can be easily and collectively mounted with an extremely simple structure by using a rod member that connects and locks the engagement holes to be attached to the first counterweight. .

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a counterweight according to the present invention.

FIG. 2 is a perspective view showing an attached state of the counter weight.

FIG. 3 is a front view showing an aerial work vehicle provided with the counterweight.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 work platform (work vehicle) 3 traveling device 4 revolving base (vehicle body) 21 counter weight body (first counter weight) 21 f, 21 g fixing pin mounting hole (engagement hole) 22 A weight (second counter weight) 23 B weight (second counter weight) 23a Engagement hole (engagement hole) 24 Fixing pin (bar member)

Claims (2)

[Claims] 1. A counterweight of a working vehicle having a counterweight mounted on a vehicle body that is configured to run freely, wherein the counterweight is a first counterweight attached to the vehicle body and exposed to an exterior surface of the vehicle body. A first counterweight detachably attached to the first counterweight to form an integral counterweight, and a second counterweight disposed inside the vehicle body when the first counterweight is mounted to the vehicle body. A counterweight for a work vehicle, wherein the second counterweight is attached and detached according to the configuration of the work vehicle. 2. The method according to claim 1, wherein the second counter weight includes a plurality of second counter weights.
A counterweight for a work vehicle, comprising a counterweight, wherein the number of the second counterweights provided is increased or decreased according to the configuration of the work vehicle.