JPH0464596A - Wheel crane - Google Patents

Abstract

PURPOSE:To improve small turn property while ensuring the farthest axial distance by forming the width dimensions of a frame front part in front of a front outrigger and a frame rear part in the rear of a rear outrigger smaller than that of a frame middle part, and providing axles in these part. CONSTITUTION:Front and rear outriggers 5, 6 expansible in vehicle body lateral direction are provided on both longitudinal sides of a vehicle body frame 1, and the width dimension of a frame front part 1a and rear part 1b is formed smaller than the width dimension W of the other part 1c. Front and rear axles 2, 3 are formed shorter than a middle axle 4 according to the frame front part 1a and frame rear part 1b, and front wheels 7 and rear wheels 8 are mounted on respective both sides of the front and rear axles 2, 3 within the width of the frame front part 1a and rear part 1b. Thus, turning radius of the vehicle body can be minimized at the time of crane traveling, so that small turn property can be improved, and a reduction in lifting capacity by contraction of outrigger extending width and reduction in torsional rigidity is never caused.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multi-shaft wheel crane.

[Conventional technology]

Large wheel cranes are constructed in a multi-axle type with a plurality of intermediate axles provided between a front axle and a rear axle in order to distribute the vehicle weight as much as possible and transmit it to the road surface.

In this case, according to the Vehicle Restriction Ordinance for Bridge Protection, the larger the distance between the farthest axles (distance between the front and rear axles, hereinafter referred to as the farthest axle distance), the greater the total vehicle weight. Therefore, the crane capacity can be increased. Therefore, conventionally, in multi-shaft wheel cranes, the farthest wheelbase distance is set as large as possible.

[Problem to be solved by the invention]

However, when the farthest wheelbase is increased in this way, the minimum turning radius during driving increases due to the length of the vehicle, which worsens the so-called tight turning ability, which poses a problem that makes it difficult to turn in narrow spaces. was occurring.

As a countermeasure to this point, it is conceivable to reduce the width dimension of the entire vehicle body frame. However, this causes the following disadvantages.

(1) Expansion and contraction (extending and retracting) on both front and rear sides of the vehicle body frame
The dimensions of the possible outriggers in the vehicle width direction must also be made smaller to match the vehicle body frame. Therefore, the outrigger extension width also becomes smaller, and the lifting capacity of the crane is reduced.

(II) As the vehicle body frame becomes thinner, the torsional rigidity of the vehicle body frame when lifting the vehicle diagonally is reduced, so that the lifting ability further decreases.

Therefore, the present invention maintains the same farthest wheelbase as before, while
Moreover, it is an object of the present invention to provide a wheel crane that can improve turning ability without causing a decrease in lifting capacity.

[Means to solve the problem]

The present invention provides a multi-axle wheel crane in which a body frame is provided with a front axle, a rear axle, and a plurality of intermediate axles. An outrigger is provided, and a width dimension of a front part of the frame in front of the front outrigger and a rear part of the frame behind the rear outrigger in the vehicle body frame is formed to be smaller than an intermediate part of the frame, and the front part of the vehicle body frame and Both the front and rear axles are provided at the rear, and the front wheels and rear wheels are attached to the front and rear axles within the widths of the front and rear parts of the vehicle body frame.

[Effect]

In this way, the front and rear width dimensions of the body frame can be adjusted to
By making it smaller than the middle part), the minimum turning radius when the crane is traveling can be made smaller. For this reason,
It is possible to improve the turning radius while maintaining the same farthest wheelbase as before.

Moreover, since only the front and rear parts of the vehicle body frame are narrow, there are problems that would occur if the overall width of the frame was made smaller.
That is, there is no risk of a reduction in the lifting capacity due to a reduction in the outrigger extension width and a reduction in torsional rigidity.

〔Example〕

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

In this embodiment, a front axle 2 is provided at the front of the vehicle body frame 1;
A four-axle wheel crane is taken as an example, which has a rear axle 3 at the rear and two intermediate axles 4.4 between these axles 2.3. In Figure 1, A is the vehicle body frame 1
The upper rotating body B mounted on the upper rotating body A is a boom provided on the upper rotating body A so as to be able to rise and fall freely.

Both front and rear outriggers 5.6, which are extendable and retractable in the width direction of the vehicle body, are provided on both front and rear sides of the vehicle body frame 1.

In the vehicle body frame 1, a frame front part 1a in front of the front outriggers 5 and a frame rear part 1b behind the rear outriggers 6 are each formed into a tapered trapezoid shape. As a result, the front part 1a and the rear part 1b of the frame
The width dimension of other parts (middle part = front and rear outriggers 5,
6) is formed smaller than the width dimension W of 1c.

In addition, both the front and rear axles 2, 3 are formed shorter than the intermediate axle 4.4 in accordance with the narrower frame front part 1a and frame rear part 1b, and are formed shorter than the intermediate axle 4.4.
A front wheel 7.7 and a rear wheel 8.8 are attached to both sides of these front and rear axles 2, 3 within the width of the rear portion 1b.

9... are intermediate wheels provided on both sides of the intermediate axle 4.4.

By doing this, as shown in FIG. 4, compared to the case (conventional) shown by the imaginary line in the same figure in which the vehicle body frame 1 is formed to have the same width dimension W over its entire length, the farthest wheelbase is wider than that shown in FIG. ) are the same, the minimum turning radius R1 is smaller because the front part 1a and rear part 1b of the frame are narrower (R construction <R2).
Become.

This improves the ability of the crane to turn in a small radius, which is advantageous for turning in narrow spaces such as factory premises and construction sites. Especially when both sides of a winding road are restricted by walls, etc.
Even curves that conventional cranes could not complete can now be curved.

Moreover, only the front part 1a and rear part 1b of the body frame are made narrow, and the front and rear outriggers 5.6 are provided on both front and rear sides of the wide frame intermediate part IC, so that the torsional rigidity of the body frame 1 is reduced when the body frame 1 is hung diagonally. There is no deterioration, and the same extension width of the outriggers 5 and 6 as before can be ensured. Therefore, there is no risk of a decrease in the lifting capacity of the crane.

In addition, auxiliary outriggers 10.11 are provided at the front and rear ends of the vehicle body frame 1, which extend and contract only in the vertical direction in fixed positions. By using both the auxiliary outriggers 10 and 11 together with the rear outriggers 5 and 6, the stability of supporting the vehicle body is enhanced when the vehicle is suspended from the front and the rear.

By the way, in the above embodiment, the front part 1a of the vehicle body frame 1
Although the frame front portion 1a and the rear portion 1b are formed to be tapered, the frame front portion 1a and the rear portion 1b may be formed in a narrow shape (convex shape in plan view) with steps on both left and right sides with respect to the frame intermediate portion IC.

In addition, from the viewpoint of bridge protection, etc., it is desirable to distribute the vehicle weight over as many wheels as possible and transmit it to the road surface, so the front and rear wheels 7.8 are also replaced with the intermediate wheels 9, . Although it is desirable to provide a pair of left and right wheels in the same way as above, it is also possible to have a single-wheel configuration in which one or both of the front and rear wheels 7 and 8 are provided.

On the other hand, although a four-axle wheel crane was used as an example in the above embodiment, the present invention is applicable to all multi-axle wheel cranes that have two or more intermediate shafts between the front and rear axles. be.

〔Effect of the invention〕

As described above, according to the present invention, the width dimension of the front part of the frame in front of the front outrigger and the rear part of the frame behind the rear outrigger in the vehicle body frame is formed to be smaller than the other parts, and the front part and the rear part of the frame are Since the front and rear axles and wheels are provided within the width of , the turning radius of the vehicle body when the crane is traveling can be reduced. Therefore, if the farthest wheelbase is the same as the conventional one, it is possible to improve the turning radius, which is particularly advantageous for turning in narrow places.

Moreover, since only the front and rear parts of the vehicle body frame are narrow, there are problems that would occur if the overall width of the frame was made smaller.
That is, there is no risk of a reduction in the lifting capacity due to a reduction in the outrigger extension width and a reduction in torsional rigidity.

[Brief explanation of the drawing]

Fig. 1 is a side view of the body of a wheel crane according to an embodiment of the present invention, Fig. 2 is a plan view of the same, Fig. 3 is a bottom view of the same, and Fig. 4 explains the turning situation of the car body when traveling. FIG. 1... Vehicle body frame, 1a... Vehicle body frame front part,
1b... Same rear part, IC... Same middle part, 2... Front axle, 3... Rear axle, 4... Intermediate axle, 5...
Front outrigger, 6... Rear outrigger, 7... Front wheel, 8... Rear wheel, 9... Intermediate wheel. Figure 4 Patent applicant Kobe Steel Co., Ltd. Representative Patent attorney Etsushi Kotani Patent attorney
1) Masamukai Patent Attorney Takao Ito

Claims (1)

[Claims] 1. In a multi-axle wheel crane in which the body frame is provided with a front axle, a rear axle, and a plurality of intermediate axles,
Both front and rear outriggers are provided on both front and rear sides of the vehicle body frame, respectively, and are extendable and retractable in the width direction of the vehicle body. The width dimension is smaller than the middle part of the frame, and both the front and rear axles are provided at the front and rear parts of this body frame, and the front wheels and rear wheels are formed within the width of the front and rear parts of this body frame. A wheel crane characterized in that the crane is mounted on the front axle and the rear axle.