Work machine
AssigneeKobelco Construction Machinery Co., Ltd.
InventorsToshiro Ueta, Michio Hirayama, Kazuomi Endo
Life of this patent
Estimating the term…
Abstract
In a work machine, a load information output part outputs a load calculated by a load calculation part as load information before a piston member shifting toward a stroke end reaches a specific position, and a load storage part stores the load calculated by the load calculation part as a specific load when the piston member shifting toward the stroke end reaches the specific position. The load information output part further outputs the specific load as the load information after the piston member shifting toward the stroke end enters a specific region.
Claims6
A work machine comprising:
- a machine body;
- a working device including a plurality of movable parts which are movable relative to the machine body, the movable parts including an attachment for holding an object of a work;
- a hydraulic cylinder having a cylinder main body and a piston member which shifts in a stroke direction with respect to the cylinder main body by receiving a supply of a hydraulic fluid into the cylinder main body to drive one of the movable parts;
- a pressure detection part which detects a cylinder pressure of the hydraulic cylinder;
- a load calculation part which calculates a load of the object held by the attachment by using the cylinder pressure;
- a load storage part;
- and
- a load information output part, wherein
- the hydraulic cylinder includes a cushion mechanism, and has a stroke range representing a maximum range where the piston member is shiftable in the stroke direction with respect to the cylinder main body, the stroke range including a cushion region constituting an end region having a stroke end which is one end of the stroke range, the cushion mechanism being configured to increase the cylinder pressure and reduce a shift speed of the piston member as the piston member shifting toward the stroke end enters the cushion region,
- a specific position is predetermined at a location spaced from the cushion region in a direction away from the stroke end, and a region between the specific position and the stroke end is predetermined as a specific region,
- the load information output part outputs the load calculated by the load calculation part as load information of the load of the object before the piston member shifting toward the stroke end reaches the specific position, and
- the load storage part stores the load calculated by the load calculation part as a specific load when the piston member shifting toward the stroke end reaches the specific position, and
- the load information output part outputs the specific load as the load information after the piston member shifting toward the stroke end enters the specific region.
Dependencies are inferred from the claim text.