JPS6225418Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an eight-wheeled tire-mounted transfer crane.

In conventional 8-wheel tire-mounted transfer cranes, the two tires at one corner were driven by one hydraulic cylinder. It was impossible to rotate the crane around the

Now, to explain the part of the yard showing the relationship between the container lane and the eight-wheeled tire-mounted transfer crane, Fig. 6 shows two parallel container lanes 21a and 2 in the container yard.
1b and the driving path 22 around it. The crane 10 is shown as having eight tires 2, and moves from a working position A on one container lane 21a to a position B on the running path 22 at the end of this lane.
Turn the entire wheel 2 by 90 degrees, then in this state move laterally to position C at the end of another container lane 21b, turn the entire wheel 2 90 degrees and return to this position, and work on the container lane 21b. It is maneuvered to move to position D. This movement can be similarly performed by both conventional four-wheeled and eight-wheeled cranes.

Next, FIG. 7 shows a part of the container yard where two container lanes 21c and 21d are not parallel.
1c, go to position F on the travel path 22 at the end of this lane, pivot the crane 10 around the wheels 2a at this position, and move to the end position G of the other container lane 21d. The crane 10 is then turned around and then maneuvered to move to the working position H on the other container lane 21d. This movement, particularly the pivot turn from position F to position G, could conventionally only be performed with a four-wheeled crane.

Next, FIGS. 3 and 4 show two types of conventional steering mechanisms for eight-wheeled cranes. First, in FIG. 3, 3 is a bogie provided at each corner of the crane 10, 4 is two sets of portal yokes attached to the bogie 3 via the shaft 5, 2 is a wheel supported on each portal yoke 4, 1 is a pair of steering cylinders connected between opposite sides of two sets of portal yokes 4, 4. When the cylinder 1 is extended, the two sets of yokes 4, 4 turn in opposite directions as shown by the arrows. When cylinder 1 is fully extended, the wheels turn exactly 90 degrees.

In addition, in FIG. 4, the cylinder 1 is connected to the bracket 3a on the bogie 3 and one side of the left side of the portal yoke 4, and the two portal yokes 4 are connected to the link rod on the opposite side of the portal yoke 4. This is a configuration in which 6 are connected.
When the cylinder 1 is extended, the two sets of portal yokes 4, 4 turn in the same direction as shown by the arrows, and when the cylinder 1 is fully extended, the wheels turn exactly 90 degrees.

Furthermore, in order to make a pivot turn like from F to G in FIG. 7, each wheel must be steered at a different angle with respect to the turning center wheel 2a, that is, each wheel must be steered in the circumferential direction with the wheel 2a as the center. However, the conventional mechanism shown in FIGS. 3 and 4 could not do this.

The present invention was proposed in order to eliminate the above-mentioned drawbacks of the conventional technology.
An object of the present invention is to provide an eight-wheeled tire-mounted transfer crane that can easily pivot and turn on wheels.

The present invention will be explained below with reference to the embodiments shown in the drawings. Figure 1A is a side view of an eight-wheeled tire-mounted transfer crane (hereinafter simply referred to as a crane) showing an embodiment of the present invention, and Figure 1B is a front view of the same. 2 is a plan view of the wheel steering of the crane shown in FIG. 1 during a pivot turn, and FIG. 5 is a similar plan view showing a steering mechanism showing an embodiment of the present invention.

First, in FIG. 5, 3a and 3b are two sets of brackets provided on both sides of the bogie 3, 11a is a first steering cylinder connected between the bracket 3a and the side of one portal yoke 4a, and 11b is the other one. This is a second steering cylinder connected between the bracket 3b and the opposite side of the other portal yoke 4b. The base ends of the cylinders 11a and 11b are pivotally connected to the respective brackets 3a and 3b, and the rod tips of the cylinders 11a and 11b are respectively pivotally connected to one end of the portal yokes 4a and 4b that support the wheels 2 and 2. , the same gate-shaped yokes 4a and 4b are respectively pivotally supported on both ends of the bogie 3. A mechanism shown in FIG. 1 is provided at each corner of the crane 10 shown in FIG.

According to this configuration, each wheel 2 of the eight-wheeled crane can be independently steered by operating the steering cylinders 11a, 11b attached to each wheel. FIG. 2 shows the required orientation of each wheel 2 at the time of the pivot turn shown in FIG. 7, with the wheel 2a being the turning center of the pivot turn. With respect to the turning center 2a of the pivot turn, the wheels at other positions are oriented in the circumferential direction, and the overall arrangement of the wheels is in the same relationship when the turning center is set at any of the other three corners of the crane. , resulting in a constant control pattern. By remotely controlling each wheel 2 according to this pattern, it becomes possible to pivot the eight-wheeled crane in any direction.

As explained in detail above, in this invention, each running tire is independently steered by a hydraulic cylinder, so each running tire can be turned independently to any desired angle, which makes it easy even for an 8-wheel type. can perform pivot turns.
When making a pivot turn, it is possible to align each tire of the eight wheels in the circumferential direction of the turning center point, and the pivot turn of the eight-wheel tire mount transfer crane can be made very smoothly and easily.

[Brief explanation of the drawing]

Figure 1A is a side view of an eight-wheeled tire-mounted transfer crane showing an embodiment of the present invention, Figure 1B is a front view of the same, and Figure 2 is the wheel steering plane of the crane shown in Figure 1 at the time of pivot turn. 3 and 4 are respectively plan views of a wheel steering mechanism at one corner of a conventional eight-wheel tire mount transfer crane, and FIG. 5 is a plan view of a wheel steering mechanism showing an embodiment of the present invention. Figure 6 and Figure 7 show container lane and 8 respectively.
FIG. 2 is a plan view of a yard portion illustrating the relationship between wheeled tire mount transfer cranes. Explanation of the main parts of the figure, 2... Wheels, 3... Bogie, 4a, 4b... Portal yoke, 10... Crane, 11a, 11b... First and second steering cylinders.

Claims (1)

[Scope of utility model registration request] In an eight-wheeled crane having two sets of wheels at each of the four corners, brackets are attached to opposite sides of the bogies provided at each of the four corners, and the base end of each hydraulic cylinder is attached to each bracket. is pivotally mounted, one end of a gate-shaped yoke for supporting the husband's wheel is pivoted to the rod end of the hydraulic cylinder, and the gate-shaped yoke is pivoted to both ends of the bogie, respectively, and the driving tire is This is an eight-wheel tire-mounted transfer crane that features independent steering operation using hydraulic cylinders.