COMBINE

• Main Authors: KOMATSU TAKUJI, HAMANO YUSUKE, SHIROSHITA TETSUYA
• Format: Patent
• Language: English; Japanese
• Published: 28.12.2016
• Subjects: AGRICULTURE; ANIMAL HUSBANDRY; FISHING; FORESTRY; HARVESTING; HUMAN NECESSITIES; HUNTING; LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS; MOTOR VEHICLES; MOWING; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES ORIMPLEMENTS, IN GENERAL; PERFORMING OPERATIONS; SOIL WORKING IN AGRICULTURE OR FORESTRY; TRAILERS; TRANSPORTING; TRAPPING

PROBLEM TO BE SOLVED: To prevent damage due to an excessive load and reduction of durability of a pitching cylinder when a combine travels with a switching valve of the pitching cylinder set to be neutral, in the combine including a horizontality maintaining hydraulic circuit adjusting a front/rear inclination of a vehicle body with the pitching cylinder.SOLUTION: When a pitching valve 36 switching supply of a motion oil to a pitching cylinder 5 to telescopic motion is set to be neutral, flow of working fluid of an extension side fluid passage and a contraction side fluid passage between the pitching cylinder 5 and the pitching valve 36 is blocked. A relief valve 57 connecting the extension side fluid passage to the contraction side fluid passage and releasing the motion oil at a predetermined pressure is arranged.SELECTED DRAWING: Figure 3 【課題】本発明は、車体の前後傾きをピッチングシリンダで調整する水平維持油圧回路を有するコンバインにおいて、ピッチングシリンダの切換弁を中立にして走行するときに、ピッチングシリンダの過大な負荷による破損や、耐久性の低下が発生することを防止する。【解決手段】ピッチングシリンダ（５）への動作オイルの供給を伸縮に切り換えるピッチングバルブ（３６）を中立にすると、前記ピッチングシリンダ（５）とピッチングバルブ（３６）の間の伸び側油路と縮み側油路の作動油の流れを遮断するように構成し、伸び側油路と縮み側油路を繋いで所定圧で動作オイルを逃がすリリーフバルブ（５７）を設ける。【選択図】図３