work vehicle
A technology for working vehicles and vehicles, applied in vehicle maintenance, lifting vehicle accessories, cranes, etc., can solve problems such as the inability to control the extension of the jack and the inability to set the extension time of the jack.
Active Publication Date: 2020-08-07
TADANO LTD
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Problems solved by technology
However, when the jack of the work vehicle is extended by manual control, it is difficult to make the load state constant by visual inspection.
In the control based on timing control, since the tire pressure and the total weight of the work vehicle are unknown, it is not possible to set the appropriate elongation time of the jack according to the tire pressure and the total weight of the work vehicle
In the control based on the tire air pressure, since the tire air pressure in the floating state is unknown, the tire air pressure immediately before the tire floats is unknown, and the appropriate elongation of the jack cannot be controlled.
In addition, in the control based on the jack reaction force, since the total weight of the work vehicle is unknown, the jack reaction force immediately before the load of the work vehicle's total weight is applied to the jack (just before the tire floats) is unknown and cannot be controlled. Proper elongation of the jack
Method used
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[0028] Next, use figure 1 and figure 2 The overall structure of work vehicle 1 according to one embodiment of the present invention will be described.
[0029] like figure 1 As shown, the work vehicle 1 is a loading truck crane in which a small crane 6 is mounted on the frame 5 between the cab 3 and the loading platform 4 of the general-purpose truck 2 . The general-purpose truck 2 is provided with tires 13 on the left and right of the front and rear wheels.
[0030] The small crane 6 includes: a base 7 , a pillar 8 , a boom 9 and a pair of outrigger devices 10 . The base 7 is fixed on the vehicle frame 5 . The pillar 8 is provided rotatably with respect to the base 7 . The boom 9 is provided on the upper end of the column 8 in a heaveable manner. A pair of outrigger devices 10 are arranged on the left and right sides of the base 7 .
[0031] A winch is built into the strut 8 . The base end of the wire rope is fixed on the winch. The wire rope is guided from the winc...
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This work vehicle is provided with a traveling vehicle having tires, an extendible jack device supporting the traveling vehicle, and a control unit, wherein during an operation to extend the jack device the control unit determines whether, in a state in which the tires are in contact with the ground surface, the state corresponds to a predetermined state, on the basis of an amount of extension of the jack and a jack reaction force. If it is determined that the state corresponds to said predetermined state, the control unit automatically stops the operation to extend the jack device. The present invention thus provides a work vehicle capable of achieving an appropriate working attitude without the work vehicle becoming overloaded.
Description
technical field [0001] The invention relates to a working vehicle. More specifically, the present invention relates to automatic jacking controls in work vehicles. Background technique [0002] Conventionally, there are manual control, timing control, automatic control based on tire air pressure or jack reaction force, etc., as the control of the jack elongation amount when the work vehicle is jacked up. As a technique for automatically controlling the amount of jack extension based on, for example, tire air pressure, the technique described in Patent Document 1 is known. [0003] The work vehicle described in Patent Document 1 includes a total of four outrigger devices and tire air pressure detection sensors arranged on the front, rear, left, and right sides of the work vehicle. When the tire is lifted by the extension of the jack, the tire pressure of the work vehicle becomes constant. When the tire air pressure becomes constant, it is determined that the work vehicle i...
Claims
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IPC IPC(8): B60S9/02B66C23/36
CPCB60S9/02B66C23/36
Inventor 池内菜菜美
Owner TADANO LTD