Title:
CARGO BED RAISING AND LOWERING APPARATUS OF DUMP TRUCK
Document Type and Number:
WIPO Patent Application WO/2020/189596
Kind Code:
A1
Abstract:
When a rising cargo bed (9) leans in a left-and-right direction due to imbalance of excavated substances therein, the present invention detects the lean as a roll angle (θR) and determines whether an absolute value (|θR|) of the roll angle is equal to or greater than an imbalance determination value (θ2) or not (S4). When the absolute value is equal to or greater than the imbalance determination value (θ2) (S4 is Yes), and the roll angle (θR) is positive, which means the cargo bed (9) is diagonally right up (S8 is Yes), an oil supply amount to a left hoist cylinder (11) (VL) is increased and an oil supply amount (VR) to a right hoist cylinder (12) is decreased (S9). Further, when the roll angle (θR) is negative, which means the cargo bed (9) is diagonally left up (S8 is No), the oil supply amount (VL) to the left is decreased and the oil supply amount (VR) to the right is increased (S10).
Inventors:
ISHII TOMOYA (JP)
ISHIHARA KAZUNORI (JP)
IWAKI TAKESHI (JP)
ISHIHARA KAZUNORI (JP)
IWAKI TAKESHI (JP)
Application Number:
PCT/JP2020/011318
Publication Date:
September 24, 2020
Filing Date:
March 16, 2020
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
B60P1/04; B62D21/18
Foreign References:
| US4382632A | 1983-05-10 | |||
| US3741608A | 1973-06-26 | |||
| JPH08268137A | 1996-10-15 | |||
| JP2000302063A | 2000-10-31 | |||
| JP2005227269A | 2005-08-25 |
Attorney, Agent or Firm:
NAGATO Kanji (JP)
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