A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
HYDRAULIC DRIVE UNIT FOR CONSTRUCTION EQUIPMENT
PROBLEM TO BE SOLVED: To provide a hydraulic drive unit for construction equipment, which is installed with a flow rate changeover device for attachments, which is superior in fit and versatility, highly reliable, capable of easily adjusting flow rate, applicable regardless the types of hydraulic circuits to be fit in, and furthermore improved in energy saving.SOLUTION: A maximum-flow cut-valve device 40 of a hydraulic drive unit for construction equipment in this invention comprises: throttling changeover valves 81a and 81b, which are switched to opening positions C and E to open both oil passages 50 and 51 when an electric switch 54 is set at the large flow side, while are switched to a throttling positions D and F to throttle oil passages on the pressure-oil supply side of the oil passages 50 and 51 when the aforesaid electric switch is set at the small flow side; and operation changeover valves 45a and 45b, which hold the aforesaid throttling changeover valves at the opening positions C and E, and by-bath valves 42a and 42b at the closed position when the electric switch 54 is set at the large flow side, while cancel the opened position of the aforesaid throttling changeover valves and the closed position of the aforesaid by-path valves when the aforesaid electric switch is set at the small flow side.SELECTED DRAWING: Figure 1
【課題】装着性及び汎用性に優れ、信頼性が高く、流量調整が容易であり、装着する油圧回路の種類を問わず対応可能であり、さらに省エネ性を向上させたアタッチメント用流量切換装置を備えた建設機械の油圧駆動装置を提供する。【解決手段】最大流量カット弁装置４０は、電気スイッチ５４が大流量側に操作されたときに油路５０，５１の両方を開放する開位置Ｃ，Ｅに切り換わり、前記電気スイッチが小流量側に操作されたときに油路５０，５１のうち圧油供給側となる油路を絞る絞り位置Ｄ，Ｆに切り換わる絞り切換弁８１ａ，８１ｂと、電気スイッチ５４が大流量側に操作されたときは前記絞り切換弁を開位置Ｃ，Ｅに、バイパス弁４２ａ，４２ｂを開位置に保持し、前記電気スイッチが小流量側に操作されたときは前記絞り切換弁の開位置と前記バイパス弁の閉位置の保持を解除する操作切換弁４５ａ，４５ｂとを備える。【選択図】 図１
HYDRAULIC DRIVE UNIT FOR CONSTRUCTION EQUIPMENT
PROBLEM TO BE SOLVED: To provide a hydraulic drive unit for construction equipment, which is installed with a flow rate changeover device for attachments, which is superior in fit and versatility, highly reliable, capable of easily adjusting flow rate, applicable regardless the types of hydraulic circuits to be fit in, and furthermore improved in energy saving.SOLUTION: A maximum-flow cut-valve device 40 of a hydraulic drive unit for construction equipment in this invention comprises: throttling changeover valves 81a and 81b, which are switched to opening positions C and E to open both oil passages 50 and 51 when an electric switch 54 is set at the large flow side, while are switched to a throttling positions D and F to throttle oil passages on the pressure-oil supply side of the oil passages 50 and 51 when the aforesaid electric switch is set at the small flow side; and operation changeover valves 45a and 45b, which hold the aforesaid throttling changeover valves at the opening positions C and E, and by-bath valves 42a and 42b at the closed position when the electric switch 54 is set at the large flow side, while cancel the opened position of the aforesaid throttling changeover valves and the closed position of the aforesaid by-path valves when the aforesaid electric switch is set at the small flow side.SELECTED DRAWING: Figure 1
【課題】装着性及び汎用性に優れ、信頼性が高く、流量調整が容易であり、装着する油圧回路の種類を問わず対応可能であり、さらに省エネ性を向上させたアタッチメント用流量切換装置を備えた建設機械の油圧駆動装置を提供する。【解決手段】最大流量カット弁装置４０は、電気スイッチ５４が大流量側に操作されたときに油路５０，５１の両方を開放する開位置Ｃ，Ｅに切り換わり、前記電気スイッチが小流量側に操作されたときに油路５０，５１のうち圧油供給側となる油路を絞る絞り位置Ｄ，Ｆに切り換わる絞り切換弁８１ａ，８１ｂと、電気スイッチ５４が大流量側に操作されたときは前記絞り切換弁を開位置Ｃ，Ｅに、バイパス弁４２ａ，４２ｂを開位置に保持し、前記電気スイッチが小流量側に操作されたときは前記絞り切換弁の開位置と前記バイパス弁の閉位置の保持を解除する操作切換弁４５ａ，４５ｂとを備える。【選択図】 図１
HYDRAULIC DRIVE UNIT FOR CONSTRUCTION EQUIPMENT
建設機械の油圧駆動装置
NAKAMURA NATSUKI (author) / YOSHIDA HAJIME (author) / TAKEBAYASHI KEIFUMI (author) / MORI KAZUSHIGE (author) / MAEHARA TAHEI (author)
2018-03-22
Patent
Electronic Resource
Japanese