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A platform for research: civil engineering, architecture and urbanism
PROBLEM TO BE SOLVED: To provide an engine rotating speed detection valve that saves energy by reducing pressure loss of a discharge line of a fixed pump while maintaining a function of varying target differential pressure according to the rotating speed of an engine.SOLUTION: An engine rotating speed detection valve 110 is installed which guides throttle upstream pressure 18 and throttle downstream pressure 19 to a main body 47 so as to detect differential pressure thereof. The engine rotating speed detection valve 110 has a piston 56 fitted slidably in a large-diameter part 51 of a spool 53 fitted slidably in the main body 47. A small-diameter part 52 of the spool 53 is provided with a communication path 60 which is formed in an axial direction. A poppet 111 is provided with a fixed throttle 112 which communicates with the throttle upstream pressure 18 and throttle downstream pressure 19 of a flow passage 68. The diameter of the spool 53 is so selected that pressure reception area A1 of the small-diameter part 52 of the spool 53, pressure reception area A2 of the piston 56, and pressure reception area A3 at a diameter difference between the large-diameter part of the spool 53 and the piston 56 are equal.
【課題】エンジンの回転数に応じて目標差圧を変更する機能を保持した状態で、固定ポンプの吐出ラインの圧力損失を低減して省エネを図ったエンジン回転数検出弁を提供。【解決手段】エンジン回転数検出弁１１０は、絞り上流圧１８の圧力と絞り下流圧１９の圧力を本体４７に導き、その差圧を検出するエンジン回転数検出弁１１０を設置する。エンジン回転数検出弁１１０は本体４７に摺動自在に嵌挿されたスプール５３の大径部５１にピストン５６が摺動自在に嵌挿されている。スプール５３の小径部５２には軸芯方向に形成する連通路６０が設けられている。ポペット１１１には流路６８の絞り上流圧１８及び絞り下流圧１９に連通する固定絞り１１２が設けられている。スプール５３の小径部５２の受圧面積Ａ１、ピストン５６の受圧面積Ａ２及びスプール５３大径部とピストン５６との径差の受圧面積Ａ３が同じなるようにスプール５３の径を選定する。【選択図】図３
PROBLEM TO BE SOLVED: To provide an engine rotating speed detection valve that saves energy by reducing pressure loss of a discharge line of a fixed pump while maintaining a function of varying target differential pressure according to the rotating speed of an engine.SOLUTION: An engine rotating speed detection valve 110 is installed which guides throttle upstream pressure 18 and throttle downstream pressure 19 to a main body 47 so as to detect differential pressure thereof. The engine rotating speed detection valve 110 has a piston 56 fitted slidably in a large-diameter part 51 of a spool 53 fitted slidably in the main body 47. A small-diameter part 52 of the spool 53 is provided with a communication path 60 which is formed in an axial direction. A poppet 111 is provided with a fixed throttle 112 which communicates with the throttle upstream pressure 18 and throttle downstream pressure 19 of a flow passage 68. The diameter of the spool 53 is so selected that pressure reception area A1 of the small-diameter part 52 of the spool 53, pressure reception area A2 of the piston 56, and pressure reception area A3 at a diameter difference between the large-diameter part of the spool 53 and the piston 56 are equal.
【課題】エンジンの回転数に応じて目標差圧を変更する機能を保持した状態で、固定ポンプの吐出ラインの圧力損失を低減して省エネを図ったエンジン回転数検出弁を提供。【解決手段】エンジン回転数検出弁１１０は、絞り上流圧１８の圧力と絞り下流圧１９の圧力を本体４７に導き、その差圧を検出するエンジン回転数検出弁１１０を設置する。エンジン回転数検出弁１１０は本体４７に摺動自在に嵌挿されたスプール５３の大径部５１にピストン５６が摺動自在に嵌挿されている。スプール５３の小径部５２には軸芯方向に形成する連通路６０が設けられている。ポペット１１１には流路６８の絞り上流圧１８及び絞り下流圧１９に連通する固定絞り１１２が設けられている。スプール５３の小径部５２の受圧面積Ａ１、ピストン５６の受圧面積Ａ２及びスプール５３大径部とピストン５６との径差の受圧面積Ａ３が同じなるようにスプール５３の径を選定する。【選択図】図３
HYDRAULIC DRIVING DEVICE
油圧駆動装置
OKAZAKI KOJI (author)
2015-11-24
Patent
Electronic Resource
Japanese