JP2560838Y2 - 6-axis special vehicle steering system - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steering device for a 6-axis special vehicle.

[0002]

2. Description of the Related Art A conventional six-axle vehicle does not have functions such as a club mode and a counter mode, and it is not easy to move in a narrow campus. A description will be given of a six-axis crane wheel as an example with reference to FIGS. 1 and 2 show a conventional six-axle wheel, the first axle of which is shown in FIG.
The second axis, the third axis and the sixth axis is the steering axis, during turning, in order to suppress the rear overhang amount, usually taken the steering center line to a point O ₁ of the fourth axis and the center line of the fifth axis (FIG. 2). First
The steering mechanisms of the shaft, the second shaft, the third shaft, and the sixth shaft are mechanically connected by a link rod 2 (FIG. 2). Since it is a large vehicle, power steering is required. The rotation of the steering wheel is transmitted to the switching valve 1 as shown in FIG.
A method of boosting the steering force with the cylinder 3 is adopted.

As shown in FIGS. 4, 5 and 6, for a four-axle vehicle, a front steer motor for steering two front axles is used.
There is a counter mode in which the front and rear shafts are steered in opposite phases (FIG. 4) and a club mode in which the front and rear shafts are steered in phase (FIG. 6). And the club mode is an effective steering method for moving on a narrow site. In the counter mode as shown in FIG. 5, the center of rotation moves ahead of the front steer mode, and the radius of rotation is reduced to make a small turn. In the club mode as shown in FIG. Can be easily adjusted.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to improve the maneuverability in a narrow space by enabling a club mode and a counter mode in a 6-axis special vehicle.

[0005]

Means for Solving the Problems In a special vehicle having six axes, a first axis, a second axis, a third axis, and a sixth axis are connected by a link rod 2, and a fourth axis and a fifth axis are flexible. -The steering shaft 7 can be fixed to the frame 9 during normal running, and the fourth and fifth shafts are fixed to the frame 9 to enable steering and have a lifting mechanism for the sixth shaft. A club mode in which the sixth axis is lifted to cut the first to fifth axes in phase.
Similarly, the sixth axis is lifted to enable a counter mode in which the first to third axes and the fourth and fifth axes are reversed in phase. The steer lock device 7 is connected by a grooved rod 7a having a groove 11 at a position where the fourth axis and the fifth axis match the straight running position of the tire, and the groove 11 of the grooved rod can be operated by an electric switch 8. A pin 7c which moves up and down by the operation of the air cylinder 7b and which fits into and disengages from the groove 11 is provided.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A description will be given with reference to FIGS. The present invention is an apparatus incorporating a counter mode and a club mode in a six-axle vehicle. The sixth axis is lifted upward in the counter mode (FIG. 12) and in the club mode (FIG. 13) so that the tire is not dragged when moving. All the axles are steering axes, and the first, second, third and sixth axes are the same as in the conventional steering system, and are connected by link rods 2 using a power steering device. The remaining fourth shaft and fifth shaft are connected to each other by a link 6 and a steer lock device 7 as shown in FIG. 8, and are locked by the steer lock device 7 during normal running (FIG. 11). Is fixed to the frame 9. Further, a power cylinder is provided, and the hydraulic pressure generated by another pump 10 is switched by the switching valve 4 so as to turn the tire left and right. When the front three axes are cut in opposite phases, the counter mode (FIG. 12) is set, and when the three axes are cut in phase, the club mode (FIG. 13) is set. The steering of the fourth axis and the fifth axis is performed by the switch 5, and the steering is performed only while the switch 5 is turned on. When the switch 5 is turned off, the steering is stopped in that state. The details of the steer lock device 7 will be described with reference to FIG. There is a grooved rod 7d between the fourth shaft and the fifth shaft, and a groove 11 is provided at a position where the tire matches the straight traveling position, and the pin 7c is fitted and removed therefrom. When the pin 7c is inserted by the spring 7a and the pin 7c is pulled upward by the air cylinder 7b, it becomes free.

[0007]

[Operation] FIG. 11 shows a normal running mode, and a conventional crane.
The first, second, third and sixth axes are steered like a steering wheel, and the fourth and fifth axes are framed by the steering lock device 7.
Is fixed to the memory 9. The center of rotation is the center O ₁ of the fourth and fifth axes, and the radius of rotation is R ₁ . When selecting one of the counter mode and the club mode, the switch 8 of the steer lock device 7 is first operated, and the pin 7c is pulled out by the air cylinder 7b. Simultaneously, when the sixth axis is lifted upward, the first, second, third and sixth axes can be steered by the steering wheel, and the fourth and fifth axes can be steered by the electric switch 5. By separately steering the fourth axis and the fifth axis in this manner, both the counter mode and the club mode running like a four-axle wheel can be performed.

For example, to operate the counter mode (FIG. 12), the lock is released by the switch 8 of the steer lock device 7, and at the same time as the steering wheel is turned, the switch 5 (FIG. 9) is turned to the opposite phase. Put in. At this time the first by the handle
When the steering angles of the axes, the second axis, the third axis, and the sixth axis are larger than the steering angles of the fourth axis and the fifth axis by the switch 5, the amount of the rear overhang during turning of the vehicle is slightly increased. If it is desired to further reduce the size, it is sufficient to turn on the switch 5, and the steering by the steering wheel and the steering by the switch 5 are independent of each other, so that the steering can be arbitrarily performed. The club mode (FIG. 13) can be arbitrarily steered similarly to the counter mode of FIG. 12 described above.

[0009]

[Effect] Since the fourth axis and the fifth axis can be steered by a different system in a phase opposite to that of the front three axes, the radius of rotation can be reduced and a small turning can be performed. Further, the fourth axis and the fifth axis can be steered in the same phase as the three front axes, so that the width can be easily shifted.

[Brief description of the drawings]

FIG. 1 is a side view of a conventional six-axis vehicle.

FIG. 2 is a bottom view of FIG. 1;

FIG. 3 is an enlarged view of a portion viewed from an arrow A in FIG. 2;

FIG. 4 is an explanatory view of a known front steer mode.

FIG. 5 is an explanatory diagram of a known counter mode.

FIG. 6 is an explanatory diagram of a known club mode.

FIG. 7 is a side view of the six-axle wheel according to the present invention.

FIG. 8 is a bottom view of FIG. 7;

FIG. 9 is a hydraulic circuit diagram of the present invention.

FIG. 10 is a steer lock device.

FIG. 11 shows a normal running mode of a six-axle vehicle.

FIG. 12 is an explanatory view of a counter mode of a six-axle wheel.

FIG. 13 is an explanatory diagram of a club mode of a six-axle vehicle.

[Explanation of symbols]

 Reference Signs List 1 switching valve 2 link rod 3 power cylinder 4 switching valve 5 switch 6 link 7 steer lock device 7a spring 7b air-cylinder 7c pin 7d grooved rod 8 switch 9 frame 10 pump

Claims (2)

(57) [Scope of request for utility model registration] In a special vehicle having six axes, a first vehicle is provided.
The shaft, the second shaft, the third shaft and the sixth shaft are connected by a link rod (2), and the fourth and fifth shafts can be fixed to the frame (9) by a steer lock device (7). During normal running, the fourth and fifth axes are fixed to the frame (9) so that they can be steered, and a lifting mechanism for the sixth axis is provided. A club mode for cutting up to five axes in the same phase, and a sixth axis is also lifted from the first to third axes, the fourth and fifth axes.
A steering device for a 6-axis special vehicle, wherein both modes of a counter mode for cutting the shaft in opposite phase are enabled. 2. The steering lock (7) is connected by a grooved rod (7a) having a groove (11) at a position where the fourth shaft and the fifth shaft are aligned with the straight traveling position of the tire. (11) has a pin (7c) which moves up and down by the operation of an air cylinder (7b) which can be operated by an electric switch (8), and which is fitted into and disengaged from the groove (11). Power of hydraulic pressure via switching valve (4)
The steering apparatus for a six-axis special vehicle according to claim 1, wherein the cylinder is capable of being fed and steered.