Working vehicle

Patent metadata

Field	Value
Publication number	US-9856625-B2
Application number	US-201515026173-A
Country	US
Kind code	B2
Filing date	Aug 7, 2015
Priority date	Aug 7, 2015
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

A working vehicle includes: a vehicle body; and a boom; a bucket; a boom driving unit including a boom cylinder; a bucket driving unit configured to swing the bucket; a boom-bottom pressure sensor configured to detect a boom-bottom pressure of the boom cylinder; and a working equipment controller configured to control at least one of a lift motion of the boom and a tilt motion of the bucket. The bucket includes an inclined portion. The working equipment controller controls the lift motion or the tilt motion by comparing a threshold set in accordance with an inclination angle of the inclined portion with the boom-bottom pressure.

First claim

The invention claimed is:

1. A working vehicle comprising:
a vehicle body;
a boom swingably supported by the vehicle body;
a bucket swingably supported by the boom;
a boom driving unit configured to swing the boom, the boom driving unit comprising a boom hydraulic cylinder;
a bucket driving unit configured to swing the bucket;
a boom-bottom pressure detector configured to detect a boom-bottom pressure of the boom hydraulic cylinder; and
a controller configured to control at least one of a lift motion of the boom and a tilt motion of the bucket,
the bucket comprising a bottom plate,
the bottom plate comprising an inclined portion inclined upward toward an innermost of the bucket when a bottom surface of the bottom plate is set horizontal,
the controller controlling the lift motion or the tilt motion by comparing a threshold set in accordance with an inclination angle of the inclined portion relative to the bottom surface with the boom-bottom pressure.

2. The working vehicle according to claim 1 , wherein the bottom plate further comprises a straight portion extending continuously from a front edge of the inclined portion.

3. The working vehicle according to claim 1 , wherein the inclination angle is in a range from four degrees to eight degrees.

4. The working vehicle according to claim 1 , wherein the controller controls the lift motion of the boom by comparing a first threshold set in accordance with the inclination angle of the inclined portion relative to the bottom surface with the boom-bottom pressure, and controls the tilt motion of the bucket by comparing a second threshold set in accordance with the inclination angle of the inclined portion relative to the bottom surface with the boom-bottom pressure.

5. A working vehicle comprising:
a vehicle body;
a boom swingably supported by the vehicle body;
a bucket swingably supported by the boom;
a boom driving unit configured to swing the boom;
a bucket driving unit configured to swing the bucket;
a horizontal reaction force detector configured to detect a horizontal reaction force applied when the bucket is thrust into an object to be loaded in the bucket; and
a controller configured to control at least one of a lift motion of the boom and a tilt motion of the bucket,
the bucket comprising a bottom plate,
the bottom plate comprising an inclined portion inclined upward toward an innermost of the bucket when a bottom surface of the bottom plate is set horizontal,

the controller controlling the lift motion or the tilting motion by comparing a threshold set in accordance with an inclination angle of the inclined portion relative to the bottom surface with the horizontal reaction force.

Assignees

• Komatsu Mfg Co Ltd

Inventors

• Wada Minoru
• Ohta Toshiyuki
• Honda Toshimitsu
• Tsutsumi Katsuhiro
• Kobayashi Takaya
• Yamagoe Yosuke

Classifications

• E02F3/43

  Control of dipper or bucket position; Control of sequence of drive operations · CPC title

• E02F3/422

  Drive systems for bucket-arms, front-end loaders, dumpers or the like · CPC title

• F15B11/161

  with sensing of servomotor demand or load · CPC title

• F15B11/20

  controlling several interacting or sequentially-operating members · CPC title

• E02F3/283

  with a single arm pivoted directly on the chassis (linkage mechanism for it E02F3/3405) · CPC title