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JP7513386B2 - Valves, hydraulic systems, construction machinery and moving valve bodies - Google Patents

Valves, hydraulic systems, construction machinery and moving valve bodies Download PDF

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Publication number
JP7513386B2
JP7513386B2 JP2019219596A JP2019219596A JP7513386B2 JP 7513386 B2 JP7513386 B2 JP 7513386B2 JP 2019219596 A JP2019219596 A JP 2019219596A JP 2019219596 A JP2019219596 A JP 2019219596A JP 7513386 B2 JP7513386 B2 JP 7513386B2
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working fluid
accommodation space
flow path
valve body
pressure
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JP2021089032A (en
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晃右 三上
良宏 山本
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Nabtesco Corp
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Nabtesco Corp
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Priority to JP2019219596A priority Critical patent/JP7513386B2/en
Priority to KR1020200141741A priority patent/KR102824314B1/en
Priority to CN202011188060.2A priority patent/CN112901578B/en
Publication of JP2021089032A publication Critical patent/JP2021089032A/en
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Priority to KR1020250080198A priority patent/KR20250103582A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location or kind of gearing
    • B60K17/10—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location or kind of gearing of fluid gearing
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
    • E02F9/2267—Valves or distributors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/26—Supply reservoir or sump assemblies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/022—Flow-dividers; Priority valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/024—Pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F16K17/0446—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with an obturating member having at least a component of their opening and closing motion not perpendicular to the closing faces
    • F16K17/046—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with an obturating member having at least a component of their opening and closing motion not perpendicular to the closing faces the valve being of the gate valve type or the sliding valve type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/14—Actuating devices; Operating means; Releasing devices actuated by fluid for mounting on, or in combination with, hand-actuated valves
    • F16K31/143—Actuating devices; Operating means; Releasing devices actuated by fluid for mounting on, or in combination with, hand-actuated valves the fluid acting on a piston
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/40—Special vehicles
    • B60Y2200/41—Construction vehicles, e.g. graders, excavators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/41—Flow control characterised by the positions of the valve element
    • F15B2211/413—Flow control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/51—Pressure control characterised by the positions of the valve element
    • F15B2211/513—Pressure control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/615—Filtering means

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Civil Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Structural Engineering (AREA)
  • Analytical Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Sliding Valves (AREA)
  • Safety Valves (AREA)
  • Details Of Valves (AREA)
  • Magnetically Actuated Valves (AREA)

Description

本発明は、油圧制御の自動化に適用される弁、油圧システム、建設機械及び移動弁体に関する。 The present invention relates to a valve, a hydraulic system, a construction machine, and a movable valve body that are applied to the automation of hydraulic control.

建設機械の油圧回路は、コントロールバルブに比例電磁弁を有するものが増えつつある。比例電磁弁は、ソレノイドによって発生させた小さな推力や、小径のスプールの圧力対抗で作動させるような精密な部品で構成されているため、比例電磁弁内に異物（コンタミネーション）が侵入しないように比例電磁弁の上流側に異物を捕獲するためのフィルタが設けられる。例えば、特許文献１参照に記載された技術によれば、フィルタの濾過メッシュの目のサイズを小さくし、電磁弁を保護しつつ、フィルタの目詰まりを防止している。 Increasingly, hydraulic circuits for construction machinery are equipped with proportional solenoid valves in the control valves. Proportional solenoid valves are made up of precision parts that are operated by the small thrust generated by a solenoid or by the pressure resistance of a small diameter spool, so a filter is provided upstream of the proportional solenoid valve to capture foreign matter (contamination) and prevent it from entering the proportional solenoid valve. For example, according to the technology described in Patent Document 1, the size of the filter's filtration mesh is reduced, preventing the filter from clogging while protecting the solenoid valve.

特開平６－８１８１５号公報Japanese Patent Application Laid-Open No. 6-81815

しかし、比例電磁弁内への異物の混入を防止するためにフィルタの目を細かくすると、低温時に作動流体の粘性が大きくなり、作動流体がフィルタを通過する際に作動流体の圧力損失が発生する。そのため、低温時で作動流体の粘性が高い場合や、比例電磁弁を急激に動作させるような操作や、電磁弁のＯＮ／ＯＦＦの切替え時に比例電磁弁にフィルタの部分で作動流体が滞留し、応答の遅れが発生する虞がある。 However, if the filter mesh is made finer to prevent foreign matter from entering the proportional solenoid valve, the viscosity of the working fluid increases at low temperatures, causing a pressure loss of the working fluid as it passes through the filter. As a result, when the viscosity of the working fluid is high at low temperatures, when the proportional solenoid valve is operated suddenly, or when the solenoid valve is switched ON/OFF, the working fluid may become trapped in the filter of the proportional solenoid valve, causing a delayed response.

本発明は、比例電磁弁の応答の遅れを低減することができる弁、油圧システム、建設機械及び移動弁体を提供することを目的とする。 The present invention aims to provide a valve, hydraulic system, construction machine, and movable valve body that can reduce the response delay of a proportional solenoid valve.

本発明の一態様に係る弁は、作動流体を収納する収容空間を有するハウジングと、前記収容空間に移動自在に収容され、所定以上の圧力が加わり前記作動流体が停滞した場合、前記収容空間内を移動し前記収容空間内に蓄えられた作動流体を前記収容空間外に排出する移動弁体と、を備える。 A valve according to one aspect of the present invention comprises a housing having a storage space for storing a working fluid, and a movable valve body that is movably housed in the storage space and that moves within the storage space and discharges the working fluid stored within the storage space to the outside of the storage space when a pressure equal to or greater than a predetermined level is applied and the working fluid stagnates.

このように構成することで、低温時で作動流体の粘性が高い場合や、比例電磁弁を急激に動作させるような操作や、電磁弁のＯＮ／ＯＦＦの切替え時に移動弁体に所定値以上の圧力が加わった場合、作動流体が流路の途中で停滞しても移動弁体が移動することにより、畜油空間に蓄えられた作動流体が下流側に供給されるため、比例電磁弁の応答の遅れを低減することができる。 By configuring it in this way, when the viscosity of the working fluid is high at low temperatures, when the proportional solenoid valve is operated suddenly, or when a pressure greater than a predetermined value is applied to the moving valve body when switching the solenoid valve ON/OFF, even if the working fluid stagnates midway through the flow path, the moving valve body moves, and the working fluid stored in the oil storage space is supplied to the downstream side, thereby reducing the response delay of the proportional solenoid valve.

上記構成であって、前記移動弁体は、前記作動流体を排出する排出口を有するようにしてもよい。 In the above configuration, the moving valve body may have an outlet for discharging the working fluid.

このように構成することで、移動弁体が移動するのに従って排出口から作動流体を排出させることができる。 By configuring it in this way, the working fluid can be discharged from the outlet as the moving valve body moves.

上記構成であって、前記移動弁体は、前記収容空間に通じる流路を有し前記流路の上流側にフィルタを備えるようにしてもよい。 In the above configuration, the moving valve body may have a flow path that leads to the storage space and a filter may be provided upstream of the flow path.

このように構成することで、フィルタの目を細かくして異物の捕獲性能を向上する共に、比例電磁弁の応答の遅れを低減することができる。 By configuring it in this way, the filter mesh can be made finer, improving the ability to capture foreign matter, while also reducing the response delay of the proportional solenoid valve.

上記構成であって、前前記移動弁体が移動した際に前記流路より上流側から前記排出口より下流側に通じるバイパス流路に設けられた他のフィルタを備えるようにしてもよい。 In the above configuration, another filter may be provided in a bypass flow path that leads from the upstream side of the flow path to the downstream side of the discharge port when the movable valve body moves.

このように構成することで、畜油空間から下流側に作動流体が供給されるのに加えて、バイパス流路からも他のフィルタを通過した作動流体が下流側に供給されるため、比例電磁弁の応答の遅れを更に低減することができる。 By configuring it in this way, in addition to the working fluid being supplied downstream from the oil storage space, working fluid that has passed through other filters is also supplied downstream from the bypass flow path, further reducing the response delay of the proportional solenoid valve.

上記構成であって、前記収容空間に嵌め込まれて前記移動弁体の前記収容空間内の動作範囲を規制するプラグを備えるようにしてもよい。 The above configuration may also include a plug that is fitted into the storage space to regulate the range of motion of the moving valve body within the storage space.

このように構成することで、少ない部品点数で摺動自在な移動弁体を有する弁体を実現することができる。 By configuring it in this way, it is possible to realize a valve body with a freely slidable movable valve body using a small number of parts.

本発明の一態様に係る弁は、作動流体を収納する収容空間を有するハウジングと、前記収容空間に収容され、所定値以上の圧力が加わり前記作動流体が停滞した場合、前記収容空間内を移動し前記収容空間内に蓄えられた作動流体を前記収容空間外に排出する排出口を有し、前記収容空間に通じる流路を有し前記流路の上流側にフィルタを備える移動弁体と、前記収容空間に嵌め込まれて前記移動弁体の前記収容空間内の動作範囲を規制するプラグと、を備える、弁である。 A valve according to one aspect of the present invention is a valve comprising: a housing having a storage space for storing a working fluid; a movable valve body that is housed in the storage space and has a discharge port that moves within the storage space and discharges the working fluid stored in the storage space to the outside of the storage space when a pressure equal to or greater than a predetermined value is applied and the working fluid stagnates; a flow path that leads to the storage space and has a filter upstream of the flow path; and a plug that is fitted into the storage space and restricts the range of movement of the movable valve body within the storage space.

このように構成することで、低温時で作動流体の粘性が高い場合や、比例電磁弁を急激に動作させるような操作や、電磁弁のＯＮ／ＯＦＦの切替え時に移動弁体に所定値以上の圧力が加わり作動流体が停滞した場合、作動流体が流路の途中で停滞しても移動弁体が移動することにより、畜油空間に蓄えられた作動流体が下流側に供給されるため、比例電磁弁の応答の遅れを低減することができる。 By configuring it in this way, when the viscosity of the working fluid is high at low temperatures, when the proportional solenoid valve is operated suddenly, or when a pressure above a predetermined value is applied to the moving valve body when switching the solenoid valve ON/OFF and the working fluid stagnates, the moving valve body moves even if the working fluid stagnates midway through the flow path, and the working fluid stored in the oil storage space is supplied to the downstream side, thereby reducing the response delay of the proportional solenoid valve.

本発明の一態様に係る油圧システムは、駆動源となるエンジンと、前記エンジンに駆動され作動流体を流通させる油圧ポンプと、前記作動流体の圧力により動作対象を駆動する複数のアクチュエータと、前記複数のアクチュエータの動作を切り替える比例電磁弁と、前記比例電磁弁の上流側に取り付けられ前記作動流体を収納する収容空間を有するハウジングと、前記収容空間に収容され所定以上の圧力が加わり前記作動流体が停滞した場合、前記収容空間内を移動し前記収容空間内に蓄えられた前記作動流体を前記収容空間外に排出する移動弁体とを備える弁と、前記作動流体を貯蔵するタンクと、前記作動流体の圧力調整のためのリリーフ弁と、を備える油圧システムである。 The hydraulic system according to one aspect of the present invention is a hydraulic system comprising an engine as a drive source, a hydraulic pump driven by the engine to circulate a working fluid, a plurality of actuators that drive an operating object by the pressure of the working fluid, a proportional solenoid valve that switches the operation of the plurality of actuators, a housing attached to the upstream side of the proportional solenoid valve and having an accommodation space for storing the working fluid, a valve that includes a moving valve body that is accommodated in the accommodation space and moves within the accommodation space to discharge the working fluid stored in the accommodation space to the outside of the accommodation space when a pressure equal to or greater than a predetermined pressure is applied and the working fluid stagnates, a tank that stores the working fluid, and a relief valve for adjusting the pressure of the working fluid.

このように構成することで、油圧システムは、低温時で作動流体の粘性が高い場合等に移動弁体に所定値以上の圧力が加わり作動流体が停滞した場合、移動弁体が移動することにより、畜油空間に蓄えられた作動流体が下流側に供給されるため、比例電磁弁の応答の遅れを低減することができる。 By configuring the hydraulic system in this way, when pressure equal to or greater than a predetermined value is applied to the moving valve body and the working fluid stagnates, such as when the viscosity of the working fluid is high at low temperatures, the moving valve body moves and the working fluid stored in the oil storage space is supplied to the downstream side, thereby reducing the response delay of the proportional solenoid valve.

本発明の一態様に係る建設機械は、駆動源となるエンジンと、前記エンジンに駆動され作動流体を流通させる油圧ポンプと、前記作動流体の圧力により動作対象を駆動する複数のアクチュエータと、前記複数のアクチュエータの動作を切り替える比例電磁弁と、前記比例電磁弁の上流側に取り付けられ前記作動流体を収納する収容空間を有するハウジングと前記収容空間に収容され所定以上の圧力が加わり前記作動流体が停滞した場合前記収容空間内を移動し前記収容空間内に蓄えられた前記作動流体を前記収容空間外に排出する移動弁体とを備える弁と、前記作動流体を貯蔵するタンクと、前記作動流体の圧力調整のためのリリーフ弁と、を備える油圧システムと、前記油圧システムにより動作する旋回体と、前記旋回体を回転自在に支持し前記油圧システムにより駆動されて走行する走行体と、を備える、建設機械である。 The construction machine according to one aspect of the present invention is a construction machine comprising an engine as a drive source, a hydraulic pump driven by the engine to circulate a working fluid, a plurality of actuators that drive an operating object by the pressure of the working fluid, a proportional solenoid valve that switches the operation of the plurality of actuators, a housing attached to the upstream side of the proportional solenoid valve and having an accommodation space for storing the working fluid, a valve that includes a moving valve body that is accommodated in the accommodation space and moves within the accommodation space when a predetermined pressure or more is applied and the working fluid stagnates, and discharges the working fluid stored in the accommodation space to the outside of the accommodation space, a tank that stores the working fluid, and a relief valve for adjusting the pressure of the working fluid. The construction machine comprises a hydraulic system that includes a rotating body that operates by the hydraulic system, and a traveling body that rotatably supports the rotating body and travels driven by the hydraulic system.

このように構成することで、低温時で作動流体の粘性が高い場合や、比例電磁弁を急激に動作させるような操作や、電磁弁のＯＮ／ＯＦＦの切替え時に移動弁体に所定値以上の圧力が加わった場合、作動流体が流路の途中で停滞しても移動弁体が移動することにより、畜油空間に蓄えられた作動流体が下流側に供給されるため、比例電磁弁の応答の遅れを低減し操作に対して応答が速い建設機械を実現することができる。 By configuring it in this way, even if the working fluid stagnates midway through the flow path when the viscosity of the working fluid is high at low temperatures, when the proportional solenoid valve is operated suddenly, or when a pressure greater than a predetermined value is applied to the moving valve body when switching the solenoid valve ON/OFF, the moving valve body moves and the working fluid stored in the oil storage space is supplied to the downstream side, reducing the response delay of the proportional solenoid valve and achieving construction machinery with a fast response to operations.

本発明の一態様に係る移動弁体は、ハウジング内に設けられた作動流体を収納する収容空間に収容され、所定以上の圧力が加わった場合、前記収容空間内を移動し前記収容空間内に蓄えられた作動流体を前記収容空間外に排出する。 The moving valve element according to one aspect of the present invention is housed in a storage space that is provided in a housing and stores a working fluid, and when a pressure equal to or greater than a predetermined level is applied, the moving valve element moves within the storage space and discharges the working fluid stored within the storage space to the outside of the storage space.

このように構成することで、少ない部品点数で摺動自在な移動弁体をを実現することができる。 By configuring it in this way, it is possible to realize a freely slidable movable valve body with a small number of parts.

本発明によれば、電気制御化に対応する油圧システムの構成を簡略化することができることができる。 The present invention makes it possible to simplify the configuration of a hydraulic system that supports electrical control.

本発明の実施形態における建設機械の概略構成図。1 is a schematic configuration diagram of a construction machine according to an embodiment of the present invention. 本発明の実施形態における油圧システムの構成図。FIG. 1 is a configuration diagram of a hydraulic system according to an embodiment of the present invention. 本発明の実施形態における弁体の構成図。FIG. 3 is a configuration diagram of a valve body according to an embodiment of the present invention. 本発明の実施形態における弁体に作動流体が流入する状態を示す図。FIG. 4 is a diagram showing a state in which a working fluid flows into a valve body in the embodiment of the present invention. 本発明の実施形態における弁体のピストンが移動する状態を示す図。5A to 5C are diagrams illustrating a state in which a piston of a valve body moves in the embodiment of the present invention. 本発明の実施形態における弁体の変形例を示す図。13A and 13B are diagrams illustrating modified examples of the valve body in the embodiment of the present invention. 本発明の実施形態における弁体の他の変形例を示す図。13A and 13B are diagrams illustrating another modified example of the valve body in the embodiment of the present invention.

次に、本発明の実施形態を図面に基づいて説明する。 Next, an embodiment of the present invention will be described with reference to the drawings.

（建設機械）
図１に示されるように、建設機械１００は、例えば油圧ショベルである。建設機械１００は、旋回体１０１と、走行体１０２とを備えている。旋回体１０１は、走行体１０２の上に旋回可能に設けられている。旋回体１０１には、油圧システム１が設けられている。 (Construction machinery)
1, the construction machine 100 is, for example, a hydraulic excavator. The construction machine 100 includes a revolving body 101 and a running body 102. The revolving body 101 is provided on the running body 102 so as to be able to revolve. The revolving body 101 is provided with a hydraulic system 1.

旋回体１０１は、操作者が搭乗可能な運転席１０３と、運転席１０３の近くで旋回体１０１に一端が揺動自在に連結されているブーム１０４と、ブーム１０４のキャブ１０３とは反対側の他端（先端）に揺動自在に一端が連結されているアーム１０５と、アーム１０５のブーム１０４とは反対側の他端（先端）に揺動自在に連結されているバケット１０６と、を備えている。また、キャブ１０３内には、油圧システム１が設けられている。この油圧システム１から供給される作動流体によって、キャブ１０３、ブーム１０４、アーム１０５、及びバケット１０６が駆動される。 The rotating body 101 is equipped with a driver's seat 103 in which an operator can sit, a boom 104, one end of which is swingably connected to the rotating body 101 near the driver's seat 103, an arm 105, one end of which is swingably connected to the other end (tip) of the boom 104 opposite the cab 103, and a bucket 106, which is swingably connected to the other end (tip) of the arm 105 opposite the boom 104. A hydraulic system 1 is provided within the cab 103. The cab 103, the boom 104, the arm 105, and the bucket 106 are driven by the working fluid supplied from this hydraulic system 1.

（油圧システム）
図２に示されるように、油圧システム１は、駆動源となるエンジン１２０と、エンジン１２０に駆動される油圧ポンプ１３０と、建設機械１００の各部を動作させる複数のアクチュエータ１４０と、複数のアクチュエータ１４０の動作を切り替える油圧制御弁１５０と、作動流体を貯蔵するタンク１６０と、圧力調整のためのリリーフ弁３００とを備える。 (Hydraulic system)
As shown in FIG. 2, the hydraulic system 1 includes an engine 120 serving as a drive source, a hydraulic pump 130 driven by the engine 120, a plurality of actuators 140 that operate various parts of the construction machine 100, a hydraulic control valve 150 that switches the operation of the plurality of actuators 140, a tank 160 that stores working fluid, and a relief valve 300 for adjusting pressure.

エンジン１２０は、ガソリンやディーゼル燃料を用いた内燃機関である。エンジン１２０は、出力軸１２１を備え、出力軸１２１は、油圧ポンプ１３０に連結されている。油圧ポンプ１３０には、配管Ｑが接続されている。油圧ポンプ１３０は、出力軸１２１に駆動されて配管Ｑに作動流体を流通させる。配管Ｑには油圧制御弁１５０が接続されている。 The engine 120 is an internal combustion engine that uses gasoline or diesel fuel. The engine 120 has an output shaft 121, which is connected to a hydraulic pump 130. A pipe Q is connected to the hydraulic pump 130. The hydraulic pump 130 is driven by the output shaft 121 to circulate a working fluid through the pipe Q. A hydraulic control valve 150 is connected to the pipe Q.

油圧制御弁１５０には、複数のアクチュエータ１４０が分岐した配管Ｑを介して接続されている。油圧制御弁１５０は、複数個設けられており、配管Ｑに流通する作動流体の油圧を複数のバルブで切り替えて複数のアクチュエータ１４０に作動流体を供給する。複数のアクチュエータ１４０は、キャブ１０３、ブーム１０４、アーム１０５、及びバケット１０６等を駆動する。リリーフ弁３００は、油圧システム１の油圧回路内において流路の圧力が予め設定された所定値以上となった場合に圧力を開放する。 The hydraulic control valve 150 is connected to a plurality of actuators 140 via a branched pipe Q. A plurality of hydraulic control valves 150 are provided, and the hydraulic pressure of the working fluid flowing through the pipe Q is switched by a plurality of valves to supply the working fluid to the plurality of actuators 140. The plurality of actuators 140 drive the cab 103, boom 104, arm 105, bucket 106, etc. The relief valve 300 releases pressure when the pressure in the flow path in the hydraulic circuit of the hydraulic system 1 reaches or exceeds a predetermined value.

油圧制御弁１５０には操作者の操作に基づいたパイロットポンプＰからの作動流体が比例電磁弁１７０を通して供給される。比例電磁弁１７０の上流側には、後述の弁２００が設けられている。図示するように、油圧システム１は、パイロットポンプＰを２個備えているが、パイロットポンプＰは、１個を共有する構成であってもよい。 The hydraulic control valve 150 is supplied with hydraulic fluid from a pilot pump P based on the operation of an operator through a proportional solenoid valve 170. A valve 200 (described below) is provided upstream of the proportional solenoid valve 170. As shown in the figure, the hydraulic system 1 has two pilot pumps P, but one pilot pump P may be shared.

次に、比例電磁弁１７０の上流側に設けられる弁２００について説明する。 Next, we will explain the valve 200 that is provided upstream of the proportional solenoid valve 170.

図３に示されるように、弁２００は、異物を捕獲するフィルタＦを備え、比例電磁弁への異物の侵入を防止する。弁２００は、作動流体の圧力の値に応じて移動するピストン２０１（移動弁体）と、ピストン２０１を収容するハウジング２２０とを備える。ハウジング２２０は、油圧システム１の筐体として一体に形成されていてもよいし、別体として形成されていてもよい。 As shown in FIG. 3, the valve 200 includes a filter F that captures foreign matter and prevents the intrusion of foreign matter into the proportional solenoid valve. The valve 200 includes a piston 201 (moving valve body) that moves according to the pressure value of the working fluid, and a housing 220 that accommodates the piston 201. The housing 220 may be formed integrally as the housing of the hydraulic system 1, or may be formed as a separate body.

ピストン２０１は、有頂の筒状に形成されている。ピストン２０１は、筒状の胴部２０２を備える。胴部２０２は、一端を閉塞するように頂面２０３を備える。胴部２０２及び頂面２０３により、ピストン２０１の内部は空洞２０１Ｓが形成されている。ピストン２０１の胴部２０２には、空洞２０１Ｓと連通する排出口２０６が軸線Ｌと直交方向に向かって形成されている。排出口２０６は、後述の下流側の流路２２４に接続されている。 The piston 201 is formed in a cylindrical shape with a top. The piston 201 has a cylindrical body 202. The body 202 has a top surface 203 that closes one end. The body 202 and the top surface 203 form a cavity 201S inside the piston 201. The body 202 of the piston 201 has an exhaust port 206 that communicates with the cavity 201S and faces in a direction perpendicular to the axis L. The exhaust port 206 is connected to a downstream flow path 224 described below.

頂面２０３は、胴部２０２の一端から他端側に向かって所定幅の円柱状に形成されている。頂面２０３には、ピストン２０１の軸線Ｌ方向に沿って作動流体が流通する流路２０４が形成されている。流路２０４は、貫通孔に形成されている。流路２０４の一端側には、流路２０４の径よりも大きくなるように段差２０５が形成されている。段差２０５には、作動流体の異物を捕獲するフィルタＦが設けられている。 The top surface 203 is formed in a cylindrical shape of a predetermined width from one end of the body 202 to the other end. A flow path 204 is formed in the top surface 203, through which the working fluid flows along the axis L direction of the piston 201. The flow path 204 is formed as a through hole. A step 205 is formed on one end side of the flow path 204 so that the step 205 is larger in diameter than the flow path 204. A filter F is provided in the step 205 to capture foreign matter in the working fluid.

フィルタＦは、上流側の後述する流路２３３から空洞２０１Ｓに流入する作動流体に混入している異物を濾過する。上記構成により、ピストン２０１は、フィルタＦを介して流路２０４から排出口２０６に作動流体を流通させる。 The filter F filters out foreign matter that is mixed into the working fluid that flows into the cavity 201S from the upstream flow path 233 described below. With the above configuration, the piston 201 allows the working fluid to flow from the flow path 204 to the outlet 206 via the filter F.

ピストン２０１は、ハウジング２２０に形成された収容空間２２１にリターンスプリングＳを介して挿入される。ハウジング２２０は、リターンスプリングＳで付勢されたピストン２０１を移動自在に収容する。リターンスプリングＳは、ピストン２０１を収容空間の開口方向に向かって付勢している。リターンスプリングＳは、ピストン２０１の空洞２０１Ｓ内に挿入される。 The piston 201 is inserted into the storage space 221 formed in the housing 220 via the return spring S. The housing 220 accommodates the piston 201, which is biased by the return spring S, so that it can move freely. The return spring S biases the piston 201 toward the opening of the storage space. The return spring S is inserted into the cavity 201S of the piston 201.

収容空間２２１は、ピストン２０１を収容する円形の空洞に形成されている。収容空間２２１の径は、ピストン２０１の外形よりも若干大きい径で形成されている。作動流体は、収容空間２２１とピストン２０１との間の隙間から収容空間２２１内に侵入し得るが、この隙間は非常に小さくここから進入する異物は、フィルタＦで捕獲される異物よりも小さいので、比例電磁弁１７０に侵入しても問題とならない。 The accommodation space 221 is formed as a circular cavity that accommodates the piston 201. The diameter of the accommodation space 221 is formed to be slightly larger than the outer diameter of the piston 201. The working fluid can enter the accommodation space 221 from the gap between the accommodation space 221 and the piston 201, but this gap is very small and any foreign matter that enters from here is smaller than the foreign matter captured by the filter F, so there is no problem even if it enters the proportional solenoid valve 170.

収容空間２２１は、軸線Ｌ方向の長さ方向においてピストン２０１を収容する空間に加えて作動流体を蓄えるための畜油空間２２３が形成されている。収容空間２２１には、ピストン２０１の排出口２０６に対応する位置に径が拡大されるように段差２２２が形成されている。段差２２２は、ピストン２０１が軸線Ｌ方向にストロークしても排出口２０６と連通するように軸線Ｌ方向に幅を持って形成されている。 The accommodation space 221 is formed with a space for accommodating the piston 201 in the lengthwise direction of the axis L, as well as an oil storage space 223 for storing the working fluid. A step 222 is formed in the accommodation space 221 so that the diameter is enlarged at a position corresponding to the discharge port 206 of the piston 201. The step 222 is formed with a width in the axis L direction so that it communicates with the discharge port 206 even when the piston 201 strokes in the axis L direction.

収容空間２２１には、段差２２２に連通して流路２２４が接続されている。流路２２４は、比例電磁弁１７０に連通している。収容空間２２１の一端側は開口２２１Ａが形成され、他端側は閉塞した畜油空間２２３が形成されている。開口２２１Ａにはネジ山２２１Ｂが形成されている。開口２２１Ａ側には、開口２２１Ａを覆うように供給プラグ２３０が嵌め込まれている。 A flow path 224 is connected to the storage space 221 through the step 222. The flow path 224 is connected to the proportional solenoid valve 170. An opening 221A is formed at one end of the storage space 221, and a closed oil storage space 223 is formed at the other end. A screw thread 221B is formed in the opening 221A. A supply plug 230 is fitted into the opening 221A side so as to cover the opening 221A.

供給プラグ２３０は、円筒形に形成されている。供給プラグ２３０の一端側は、ネジ山２２１Ｂに螺合するネジ山２３１が形成されている。供給プラグ２３０は、開口２２１Ａに螺入された際にハウジング２２０に固定されるように段差２３２が形成されている。供給プラグ２３０は、リターンスプリングＳで付勢されたピストン２０１を押し込みながら開口２２１Ａに螺入され、段差２３２がハウジング２２０に当接すると、ピストン２０１をハウジング２２０の収容空間２２１に閉じ込める。 The supply plug 230 is formed in a cylindrical shape. One end of the supply plug 230 is formed with threads 231 that screw into the threads 221B. The supply plug 230 is formed with a step 232 so that it is fixed to the housing 220 when screwed into the opening 221A. The supply plug 230 is screwed into the opening 221A while pushing in the piston 201 biased by the return spring S, and when the step 232 abuts against the housing 220, it confines the piston 201 in the accommodation space 221 of the housing 220.

これにより、ピストン２０１は、収容空間２２１内において頂面２０３が供給プラグ２３０側に当接するようにリターンスプリングＳに付勢され、ピストン２０１に外力が加わるとリターンスプリングＳが縮む方向に摺動する。このようにして、供給プラグ２３０は、ピストン２０１の収容空間２２１内の動作範囲を規制する。即ち供給プラグ２３０により、ピストン２０１が位置決めされる。このように、供給プラグ２３０は、少ない部品点数で摺動自在なピストン２０１を有する弁２００を実現することができる。 As a result, the piston 201 is biased by the return spring S so that the top surface 203 abuts against the supply plug 230 side within the accommodation space 221, and when an external force is applied to the piston 201, it slides in the direction in which the return spring S contracts. In this way, the supply plug 230 regulates the range of motion of the piston 201 within the accommodation space 221. In other words, the piston 201 is positioned by the supply plug 230. In this way, the supply plug 230 can realize a valve 200 having a freely slidable piston 201 with a small number of parts.

供給プラグ２３０の他端側には、軸線Ｌ方向に沿って流路２３３の入口２３４が形成されている。流路２３３は、貫通孔に形成されている。流路２３３の上流側には、流路２３３の径よりも大きい径で入口２３４が形成されている。流路２３３の下流側には、流路２３３の径よりも大きい径で拡大部２３５が形成されている流路２３３は、フィルタＦを介して流路２０４に作動流体を流通させる。 At the other end of the supply plug 230, an inlet 234 of the flow passage 233 is formed along the axis L direction. The flow passage 233 is formed as a through hole. At the upstream side of the flow passage 233, an inlet 234 is formed with a diameter larger than the diameter of the flow passage 233. At the downstream side of the flow passage 233, an enlarged portion 235 is formed with a diameter larger than the diameter of the flow passage 233. The flow passage 233 circulates the working fluid to the flow passage 204 via the filter F.

次に、弁２００の動作について説明する。 Next, the operation of the valve 200 will be explained.

図４に示されるように、供給プラグ２３０の外部から流路２３３に作動流体が流入する際に、低温時で作動流体の粘性が高い場合や、比例電磁弁１７０を急激に動作させるような操作や比例電磁弁１７０のＯＮ／ＯＦＦの切替え等が発生した場合、流路２３３内を流通する作動流体はフィルタＦで圧力損失が発生し、作動流体がフィルタＦを通過しきれずにフィルタＦ部分で停滞する。フィルタＦ部分で停滞した作動流体により、フィルタＦ部分において圧力が高まる。 As shown in FIG. 4, when the working fluid flows into the flow path 233 from outside the supply plug 230, if the viscosity of the working fluid is high at low temperatures, or if an operation such as abruptly operating the proportional solenoid valve 170 or switching the proportional solenoid valve 170 ON/OFF occurs, the working fluid flowing through the flow path 233 experiences a pressure loss in the filter F, and the working fluid cannot pass through the filter F and stagnates in the filter F section. The working fluid stagnates in the filter F section, causing an increase in pressure in the filter F section.

図５に示されるように、作動流体の圧力が所定値以上となった場合、ピストン２０１は、リターンスプリングＳが縮む方向に移動する。ピストン２０１が移動すると、ピストン２０１は、収容空間２２１において畜油空間２２３からピストン２０１が移動した体積分の作動流体を排出口２０６から流路２２４に排出させる。流路２３３に流入する作動流体の流通が通常状態に戻ると、作動流体がフィルタＦを通過するようになり、ピストン２０１に加わる圧力が所定値未満となる。そうすると、ピストン２０１は、リターンスプリングＳに供給プラグ２３０の方向に押し戻される。作動流体はフィルタＦを介して空洞２０１Ｓに流入し、排出口２０６から排出され、下流側の流路２２４に流入する。 As shown in FIG. 5, when the pressure of the working fluid becomes equal to or greater than a predetermined value, the piston 201 moves in a direction in which the return spring S contracts. When the piston 201 moves, the piston 201 discharges the volume of working fluid moved by the piston 201 from the oil storage space 223 in the storage space 221 through the outlet 206 to the flow path 224. When the flow of the working fluid flowing into the flow path 233 returns to a normal state, the working fluid passes through the filter F, and the pressure applied to the piston 201 becomes less than the predetermined value. Then, the piston 201 is pushed back by the return spring S in the direction of the supply plug 230. The working fluid flows into the cavity 201S through the filter F, is discharged from the outlet 206, and flows into the downstream flow path 224.

上述したように、弁２００によれば、比例電磁弁１７０を急激に動作させるような操作等が発生してフィルタＦにおいて作動流体の圧力損失が発生した場合でも、ピストン２０１が移動して畜油空間２２３に蓄えられた作動流体を流路２２４に流入させ、比例電磁弁１７０に滞りなく作動流体を供給し比例電磁弁１７０の応答の遅れを低減することができる。 As described above, with the valve 200, even if an operation that suddenly operates the proportional solenoid valve 170 occurs and pressure loss of the working fluid occurs in the filter F, the piston 201 moves and causes the working fluid stored in the oil storage space 223 to flow into the flow path 224, thereby smoothly supplying the working fluid to the proportional solenoid valve 170 and reducing the response delay of the proportional solenoid valve 170.

［変形例］
図６に示されるように、弁２００にバイパス流路２５０が設けられていてもよい。バイパス流路２５０は、ピストン２０１の頂面２０３近傍から流路２２４に接続されている。バイパス流路２５０の途中には、フィルタＦと異なる他のフィルタＦ１が設けられている。ピストン２０１が移動すると、バイパス流路２５０と流路２３３が接続されると共に、作動流体が流路２３３からバイパス流路２５０を介して下流側の流路２２４に短絡されて流出する。バイパス流路２５０を有する弁２００によれば、畜油空間２２３に蓄えられた作動流体が下流側の流路２２４に供給されるのに加えて、バイパス流路２５０からも作動流体が供給されるので、比例電磁弁１７０の応答の遅れを低減することができる。 [Modification]
As shown in FIG. 6, the valve 200 may be provided with a bypass flow passage 250. The bypass flow passage 250 is connected to the flow passage 224 from the vicinity of the top surface 203 of the piston 201. Another filter F1 different from the filter F is provided in the middle of the bypass flow passage 250. When the piston 201 moves, the bypass flow passage 250 and the flow passage 233 are connected, and the working fluid is short-circuited from the flow passage 233 to the downstream flow passage 224 through the bypass flow passage 250 and flows out. According to the valve 200 having the bypass flow passage 250, in addition to the working fluid stored in the oil storage space 223 being supplied to the downstream flow passage 224, the working fluid is also supplied from the bypass flow passage 250, so that the delay in the response of the proportional solenoid valve 170 can be reduced.

なお、本発明は上述の実施形態に限られるものではなく、本発明の趣旨を逸脱しない範囲において、上述の実施形態に種々の変更を加えたものを含む。上記実施形態では作動流体が作動油である油圧システムを例示したが、実施形態に係る弁は油圧で作動するものの他、アルコール、水、燃料が作動流体として用いられる液圧システムに適用してもよい。上記実施形態では、ピストン２０１の排出口２０６に対応する位置に径が拡大されるように段差２２２が形成されている構成を例示したが、図７に示されるように、段差２２２は、ピストン２０１の外周側に形成してもよい。 The present invention is not limited to the above-mentioned embodiment, and includes various modifications of the above-mentioned embodiment without departing from the spirit of the present invention. In the above-mentioned embodiment, a hydraulic system in which the working fluid is hydraulic oil is exemplified, but the valve according to the embodiment may be applied to a hydraulic system in which alcohol, water, or fuel is used as the working fluid, in addition to those operated by hydraulic pressure. In the above-mentioned embodiment, a configuration in which a step 222 is formed at a position corresponding to the outlet 206 of the piston 201 so that the diameter is enlarged is exemplified, but as shown in FIG. 7, the step 222 may be formed on the outer periphery of the piston 201.

１…油圧システム、１００…建設機械、１０１…旋回体、１０２…走行体、１０３…キャブ、１０４…ブーム、１０５…アーム、１０６…バケット、１２０…エンジン、１２１…出力軸、１３０…油圧ポンプ、１４０…アクチュエータ、１５０…油圧制御弁、１６０…タンク、１７０…比例電磁弁、２００…弁、２０１…ピストン（移動弁体）、２０１Ｓ…空洞、２０２…胴部、２０３…頂面、２０４…流路、２０５…段差、２０６…排出口、２２０…ハウジング、２２１…収容空間、２２１Ａ…開口、２２１Ｂ…ネジ山、２２２…段差、２２３…畜油空間、２２４…流路、２３０…供給プラグ、２３１…ネジ山、２３２…段差、２３３…流路、２３４…入口、２３５…拡大部、２５０…バイパス流路、３００…リリーフ弁、Ｆ…フィルタ、Ｆ１…フィルタ、Ｌ…軸線、Ｐ…パイロットポンプ、Ｑ…配管、Ｓ…リターンスプリング 1...hydraulic system, 100...construction machine, 101...swivel body, 102...traveling body, 103...cab, 104...boom, 105...arm, 106...bucket, 120...engine, 121...output shaft, 130...hydraulic pump, 140...actuator, 150...hydraulic control valve, 160...tank, 170...proportional solenoid valve, 200...valve, 201...piston (moving valve body), 201S...cavity, 202...body, 203...top surface, 204...flow path, 20 5...step, 206...discharge port, 220...housing, 221...accommodation space, 221A...opening, 221B...thread, 222...step, 223...oil storage space, 224...flow path, 230...supply plug, 231...thread, 232...step, 233...flow path, 234...inlet, 235...expanded section, 250...bypass flow path, 300...relief valve, F...filter, F1...filter, L...axis, P...pilot pump, Q...piping, S...return spring

Claims (7)

作動流体を収納する収容空間を有するハウジングと、
前記収容空間に収容され、所定以上の圧力が加わり前記作動流体が停滞した場合、前記収容空間内を移動し前記収容空間内に蓄えられた前記作動流体を前記収容空間外に排出する移動弁体と、を備え、
前記移動弁体は、前記作動流体を排出する排出口を有するとともに、前記収容空間に通じる流路を有し前記流路の上流側にフィルタを備え、
前記移動弁体は、前記フィルタよりも上流側に前記所定以上の圧力が加わったとき、前記収容空間内を移動する、
弁。 a housing having an accommodation space for accommodating a working fluid;
a movable valve body that is accommodated in the accommodation space and that moves within the accommodation space and discharges the working fluid stored in the accommodation space to the outside of the accommodation space when a pressure equal to or greater than a predetermined pressure is applied and the working fluid stagnates ,
the movable valve body has an outlet for discharging the working fluid, a flow path communicating with the accommodation space, and a filter provided on an upstream side of the flow path;
The moving valve body moves within the accommodation space when a pressure equal to or greater than the predetermined pressure is applied upstream of the filter.
valve. 前記移動弁体が移動した際に前記流路より上流側から前記排出口より下流側に通じるバイパス流路に設けられた他のフィルタを備える、
請求項１に記載の弁。 a second filter provided in a bypass flow path that leads from the upstream side of the flow path to the downstream side of the discharge port when the movable valve body moves;
2. The valve of claim 1 . 作動流体を収納する収容空間を有するハウジングと、
前記収容空間に収容され、所定以上の圧力が加わり前記作動流体が停滞した場合、前記収容空間内を移動し前記収容空間内に蓄えられた前記作動流体を前記収容空間外に排出する移動弁体と、を備え、
前記移動弁体は、前記作動流体を排出する排出口を有するとともに、前記収容空間に通じる流路を有し前記流路の上流側にフィルタを備え、
前記移動弁体が移動した際に前記流路より上流側から前記排出口より下流側に通じるバイパス流路に設けられた他のフィルタを備える、
弁。 a housing having an accommodation space for accommodating a working fluid;
a movable valve body that is accommodated in the accommodation space and that moves within the accommodation space and discharges the working fluid stored in the accommodation space to the outside of the accommodation space when a pressure equal to or greater than a predetermined pressure is applied and the working fluid stagnates,
the movable valve body has an outlet for discharging the working fluid, a flow path communicating with the accommodation space, and a filter provided on an upstream side of the flow path ;
a second filter provided in a bypass flow path that leads from the upstream side of the flow path to the downstream side of the discharge port when the movable valve body moves;
valve. 前記収容空間に嵌め込まれて前記移動弁体の前記収容空間内の動作範囲を規制するプラグを備える、
請求項１から３のうちいずれか１項に記載の弁。 a plug that is fitted into the accommodation space and restricts a range of motion of the movable valve body within the accommodation space;
A valve according to any one of claims 1 to 3 . 駆動源となるエンジンと、
前記エンジンに駆動され作動流体を流通させる油圧ポンプと、
前記作動流体の圧力により動作対象を駆動する複数のアクチュエータと、
前記複数のアクチュエータの動作を切り替える比例電磁弁と、
前記比例電磁弁の上流側に取り付けられ前記作動流体を収納する収容空間を有するハウジングと、前記収容空間に収容され所定以上の圧力が加わり前記作動流体が停滞した場合、前記収容空間内を移動し前記収容空間内に蓄えられた前記作動流体を前記収容空間外に排出する移動弁体とを備える弁と、
前記作動流体を貯蔵するタンクと、
前記作動流体の圧力調整のためのリリーフ弁と、を備え、
前記移動弁体は、前記作動流体を排出する排出口を有するとともに、前記収容空間に通じる流路を有し前記流路の上流側にフィルタを備え、
前記移動弁体は、前記フィルタよりも上流側に前記所定以上の圧力が加わったとき、前記収容空間内を移動する、
油圧システム。 An engine as a driving source;
a hydraulic pump driven by the engine to circulate a working fluid;
A plurality of actuators that drive an operating object by the pressure of the working fluid;
A proportional solenoid valve for switching the operation of the plurality of actuators;
a valve including: a housing attached to the upstream side of the proportional solenoid valve and having a storage space for storing the working fluid; and a movable valve body housed in the storage space, which moves within the storage space when a predetermined pressure or more is applied and the working fluid stagnates; and
A tank for storing the working fluid;
a relief valve for adjusting the pressure of the working fluid ,
the movable valve body has an outlet for discharging the working fluid, a flow path communicating with the accommodation space, and a filter provided on an upstream side of the flow path;
The moving valve body moves within the accommodation space when a pressure equal to or greater than the predetermined pressure is applied upstream of the filter.
Hydraulic system. 駆動源となるエンジンと、前記エンジンに駆動され作動流体を流通させる油圧ポンプと、前記作動流体の圧力により動作対象を駆動する複数のアクチュエータと、前記複数のアクチュエータの動作を切り替える比例電磁弁と、前記比例電磁弁の上流側に取り付けられ前記作動流体を収納する収容空間を有するハウジングと前記収容空間に収容され所定以上の圧力が加わり前記作動流体が停滞した場合前記収容空間内を移動し前記収容空間内に蓄えられた前記作動流体を前記収容空間外に排出する移動弁体とを備える弁と、前記作動流体を貯蔵するタンクと、前記作動流体の圧力調整のためのリリーフ弁と、を備える油圧システムと、
前記油圧システムにより動作する旋回体と、
前記旋回体を回転自在に支持し前記油圧システムにより駆動されて走行する走行体と、を備え、
前記移動弁体は、前記作動流体を排出する排出口を有するとともに、前記収容空間に通じる流路を有し前記流路の上流側にフィルタを備え、
前記移動弁体は、前記フィルタよりも上流側に前記所定以上の圧力が加わったとき、前記収容空間内を移動する、
建設機械。 a hydraulic system comprising: an engine serving as a drive source; a hydraulic pump driven by the engine to circulate a working fluid; a plurality of actuators that drive an object to be operated by the pressure of the working fluid; a proportional solenoid valve that switches the operation of the plurality of actuators; a valve including a housing attached to the upstream side of the proportional solenoid valve and having an accommodation space for storing the working fluid, and a movable valve body that is accommodated in the accommodation space and moves within the accommodation space when a predetermined pressure or more is applied and the working fluid stagnates, and discharges the working fluid accumulated within the accommodation space to the outside of the accommodation space; a tank that stores the working fluid; and a relief valve for adjusting the pressure of the working fluid;
A rotating body operated by the hydraulic system;
a traveling body that rotatably supports the rotating body and travels by being driven by the hydraulic system ,
the movable valve body has an outlet for discharging the working fluid, a flow path communicating with the accommodation space, and a filter provided on an upstream side of the flow path;
The moving valve body moves within the accommodation space when a pressure equal to or greater than the predetermined pressure is applied upstream of the filter.
Construction machinery. ハウジング内に設けられた作動流体を収納する収容空間に収容され、前記作動流体を排出する排出口を有するとともに、前記収容空間に通じる流路を有し前記流路の上流側にフィルタを備え、
前記フィルタよりも上流側に所定以上の圧力が加わり前記作動流体が停滞した場合、前記収容空間内を移動し前記収容空間内に蓄えられた作動流体を前記収容空間外に排出する移動弁体。 the working fluid is accommodated in an accommodating space provided in a housing, the working fluid is accommodated in the accommodating space, the working fluid is discharged from the accommodating space, and a filter is provided on the upstream side of the flow path;
A movable valve body that moves within the storage space and discharges the working fluid stored in the storage space to the outside of the storage space when a pressure greater than a predetermined value is applied upstream of the filter and the working fluid stagnates.
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