JP5481350B2 - Hydraulic drive device for work machine - Google Patents

Hydraulic drive device for work machine Download PDF

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Publication number
JP5481350B2
JP5481350B2 JP2010248558A JP2010248558A JP5481350B2 JP 5481350 B2 JP5481350 B2 JP 5481350B2 JP 2010248558 A JP2010248558 A JP 2010248558A JP 2010248558 A JP2010248558 A JP 2010248558A JP 5481350 B2 JP5481350 B2 JP 5481350B2
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valve
oil
filter
pressure
oil passage
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JP2012097885A (en
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克明 小高
優太 中村
征勲 茅根
和弘 一村
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Hitachi Construction Machinery Co Ltd
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Hitachi Construction Machinery Co Ltd
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Priority to JP2010248558A priority Critical patent/JP5481350B2/en
Priority to CN201180053096.2A priority patent/CN103201523B/en
Priority to KR1020137011676A priority patent/KR101850570B1/en
Priority to PCT/JP2011/075078 priority patent/WO2012060331A1/en
Priority to EP11837981.7A priority patent/EP2636910B1/en
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    • 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
    • E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
    • 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
    • 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
    • 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
    • E02F9/225—Control of steering, e.g. for hydraulic motors driving the vehicle tracks
    • 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
    • E02F9/226—Safety arrangements, e.g. hydraulic driven fans, preventing cavitation, leakage, overheating
    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
    • 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
    • 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
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check 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
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/615—Filtering means
    • 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
    • F15B2211/625—Accumulators

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)

Description

本発明は、ホイールショベル等の作業機械に備えられ、油路を流れる油に混入されたゴミを捕集するフィルタを備えた作業機械の油圧駆動装置に関する。   The present invention relates to a hydraulic drive device for a work machine that is provided in a work machine such as a wheel excavator and includes a filter that collects dust mixed in oil flowing through an oil passage.

この種の従来技術として、特許文献１に記載されるものがある。この特許文献１に示される従来技術は、油圧ポンプから吐出される圧油が供給される油圧回路の上流の油路に設けられ、油圧ポンプから吐出される油に混入されるゴミを捕集するフィルタと、このフィルタに並設させるように油路に配置され、油圧ポンプ側から油圧回路側への油の流れを許容させ、油圧回路側から油圧ポンプ側への油の流れを阻止する逆止弁とを備えた構成が示されている。   As this type of prior art, there is one described in Patent Document 1. The prior art disclosed in Patent Document 1 is provided in an oil passage upstream of a hydraulic circuit to which pressure oil discharged from a hydraulic pump is supplied, and collects dust mixed in the oil discharged from the hydraulic pump. A check and a non-return check that is arranged in the oil passage so as to be juxtaposed with the filter, allows oil flow from the hydraulic pump side to the hydraulic circuit side, and prevents oil flow from the hydraulic circuit side to the hydraulic pump side. A configuration with a valve is shown.

この従来技術は、フィルタを通過して清浄となった油が油圧回路に供給される。また、フィルタに目詰まりを生じ、フィルタを油が通過しにくくなったときには、フィルタの上流が高圧となることによってフィルタに並設された逆止弁を介して油圧回路に油が供給される。これにより、フィルタの目詰まりに伴う油圧ポンプを含む回路全体の破損を防ぐことができるようになっている。   In this prior art, oil that has passed through a filter and has been cleaned is supplied to a hydraulic circuit. Further, when the filter is clogged and it becomes difficult for oil to pass through the filter, the oil is supplied to the hydraulic circuit via a check valve arranged in parallel with the filter due to the high pressure upstream of the filter. As a result, it is possible to prevent the entire circuit including the hydraulic pump from being damaged due to clogging of the filter.

上述した従来技術は、油圧ポンプに対して上流側にフィルタを設けたものであるが、油圧ポンプに対して下流側の油圧回路にフィルタを設けたものも従来公知である。すなわち、油圧ポンプの下流側の油圧回路に、弁体と、この弁体の切り換え圧力の最高圧力を規定するリリーフ弁とを備え、弁体とリリーフ弁とを連絡する油路に、この油路を流れるゴミを捕集するフィルタを備えた構成も従来から知られている。このように構成されたものは、油圧ポンプの下流側の油路を流れる油の清浄化を実現させることができる。   The conventional technology described above is provided with a filter on the upstream side of the hydraulic pump, but a filter provided with a filter in the hydraulic circuit on the downstream side of the hydraulic pump is also conventionally known. That is, the hydraulic circuit on the downstream side of the hydraulic pump is provided with a valve body and a relief valve that regulates the maximum switching pressure of the valve body, and the oil passage is connected to the oil passage that connects the valve body and the relief valve. A configuration including a filter that collects dust flowing through the pipe is also known. What was comprised in this way can implement | achieve the cleaning of the oil which flows through the oil path of the downstream of a hydraulic pump.

実開平６−３５６０７号公報Japanese Utility Model Publication No. 6-35607

上述した従来公知の構成を有する油圧駆動装置、すなわち、弁体とリリーフ弁とを連結する油路にフィルタを設けた構成を有する従来技術にあっては、フィルタの目詰まりに伴う問題がある。すなわち、フィルタの目詰まりの程度が大きくなると、フィルタ側からリリーフ弁側への油の流れに制約を受け、このため弁体とフィルタとを連絡する油路部分が次第に高圧となり、この高圧が当該油路部分に閉じ込められることから、当該油路、弁体を含む油圧回路全体が破損する虞がある。   The conventional hydraulic drive apparatus having the above-described conventionally known configuration, that is, the conventional technology having the configuration in which the filter is provided in the oil passage connecting the valve body and the relief valve has a problem associated with clogging of the filter. In other words, when the degree of clogging of the filter increases, the flow of oil from the filter side to the relief valve side is restricted, so that the oil passage portion connecting the valve body and the filter gradually becomes high pressure, and this high pressure Since it is confined in the oil passage portion, the entire hydraulic circuit including the oil passage and the valve body may be damaged.

そこで、このような油圧回路の破損を防ぐためには、弁体とフィルタとの間にリリーフ弁を設けて、弁体とフィルタとを連絡する油路部分が高圧となったときに、その高圧をリリーフ弁から逃がすように構成することが考えられる。しかし、リリーフ弁は一般に高価なものであることから、このようにリリーフ弁を設けるように構成すると、当該油圧駆動装置の製作コストが高くなる不具合を生じる。   Therefore, in order to prevent such damage to the hydraulic circuit, a relief valve is provided between the valve body and the filter, and when the oil passage portion connecting the valve body and the filter becomes high pressure, the high pressure is reduced. It is conceivable to configure the relief valve to escape. However, since the relief valve is generally expensive, if the relief valve is provided in this way, there is a problem that the manufacturing cost of the hydraulic drive device increases.

本発明は、上述した従来技術における実状からなされたもので、その目的は、弁体とリリーフ弁とを連絡する油路に配置されたフィルタに目詰まりを生じた場合でも、弁体とフィルタとを連絡する油路部分の高圧の油を比較的安価な構造によってリリーフ弁に導くことができる作業機械の油圧駆動装置を提供することにある。   The present invention has been made from the actual state in the above-described prior art, and its purpose is to provide the valve body and the filter even when the filter disposed in the oil passage connecting the valve body and the relief valve is clogged. It is an object of the present invention to provide a hydraulic drive device for a work machine that can guide high-pressure oil in an oil passage portion that communicates to a relief valve with a relatively inexpensive structure.

この目的を達成するために、本発明に係る作業機械の油圧駆動装置は、油圧ポンプと、この油圧ポンプから吐出される圧油に応じて切り換えられる弁体と、この弁体の切り換え圧力の最高圧力を規定するリリーフ弁と、上記弁体と上記リリーフ弁とを連絡する油路に設けられるフィルタとを備えた作業機械の油圧駆動装置において、上記油路に、上記フィルタに並設させて、上記弁体側から上記リリーフ弁側への油の流れを許容させ、上記リリーフ弁側から上記弁体側への油の流れを阻止する逆止弁を設け、上記油圧ポンプから吐出される圧油が供給されるバルブを備え、このバルブ内に、上記弁体、上記リリーフ弁、上記油路、上記フィルタ、及び上記逆止弁を設け、ブレーキ弁と、このブレーキ弁に圧油を供給可能なアキュムレータとを備え、上記バルブが、上記アキュムレータに圧油を供給可能なチャージバルブから成り、上記弁体が、上記アキュムレータの蓄圧が所定圧より高くなったときに、その高圧の圧油を逃がすことが可能な開閉弁から成ることを特徴としている。 In order to achieve this object, a hydraulic drive device for a work machine according to the present invention includes a hydraulic pump, a valve body that is switched according to pressure oil discharged from the hydraulic pump, and a maximum switching pressure of the valve body. In a hydraulic drive device for a work machine including a relief valve that regulates pressure and a filter provided in an oil passage that communicates the valve body and the relief valve, the oil passage is provided in parallel with the filter, A check valve is provided to allow the oil flow from the valve body side to the relief valve side and to block the oil flow from the relief valve side to the valve body side, and pressure oil discharged from the hydraulic pump is supplied. Provided with the valve body, the relief valve, the oil passage, the filter, and the check valve in the valve, a brake valve, and an accumulator capable of supplying pressure oil to the brake valve; The The valve is composed of a charge valve capable of supplying pressure oil to the accumulator, and the valve body can release the high pressure oil when the accumulated pressure of the accumulator becomes higher than a predetermined pressure. It is characterized by comprising an on-off valve .

このように構成した本発明は、弁体とリリーフ弁とを連絡する油路に配置されたフィルタに目詰まりを生じ、弁体とフィルタとを連絡する油路部分が高圧となったときには、フィルタに並設された比較的安価である逆止弁、すなわち一般にリリーフ弁等に比べて安価とされている逆止弁を介してリリーフ弁に油を導き、このリリーフ弁の作動によって高圧の圧油を逃がすことができる。これにより、当該油路部分に高い圧力が閉じ込められず、油路、弁体を含む油圧回路全体の破損を防ぐことができる。   The present invention configured in this manner causes clogging in the filter disposed in the oil passage that connects the valve body and the relief valve, and when the oil passage portion that connects the valve body and the filter becomes high pressure, the filter The oil is led to the relief valve through a relatively inexpensive check valve arranged in parallel to the relief valve, that is, generally a check valve that is less expensive than a relief valve, etc. Can escape. Thereby, a high pressure is not confined in the oil passage portion, and damage to the entire hydraulic circuit including the oil passage and the valve body can be prevented.

また、本発明に係る作業機械の油圧駆動装置は、上記発明において、上記作業機械がホイールショベルから成り、上記油圧ポンプから吐出される圧油が供給されるプライオリティバルブとステアリングバルブとを備え、上記プライオリティバルブを介して上記チャージバルブに圧油を導く油路を設けるとともに、上記油圧ポンプと上記プライオリティバルブを連絡する別の油路に別のフィルタを設け、上記別の油路に、上記別のフィルタに並設させて、上記油圧ポンプ側から上記プライオリティバルブ側への油の流れを許容させ、上記プライオリティバルブ側から上記油圧ポンプ側への油の流れを阻止する逆止弁を配置したことを特徴としている。   A hydraulic drive device for a work machine according to the present invention is the above-described invention, wherein the work machine includes a wheel excavator, and includes a priority valve and a steering valve to which pressure oil discharged from the hydraulic pump is supplied, An oil passage for introducing pressure oil to the charge valve via the priority valve is provided, another filter is provided in another oil passage connecting the hydraulic pump and the priority valve, and the other oil passage is provided with the other oil passage. A check valve is arranged in parallel with the filter to allow the oil flow from the hydraulic pump side to the priority valve side and to block the oil flow from the priority valve side to the hydraulic pump side. It is a feature.

本発明は、弁体とリリーフ弁とを連絡する油路にフィルタを備えたものにあって、上述の油路に、フィルタに並設させて弁体側からリリーフ弁側への油の流れを許容させ、リリーフ弁側から弁体側への油の流れを阻止する逆止弁を設けたことから、フィルタに目詰まりを生じても、比較的安価な逆止弁を介して弁体とフィルタとを連絡する油路部分の高圧の油をリリーフ弁に導くことができる。これにより、油路、弁体を含む当該油圧駆動装置の製作コストが高くなることを抑えながら油圧回路全体の破損を防ぐことができ、優れた油圧回路の保護を低コストで実現させることができる。   The present invention is provided with a filter in the oil passage connecting the valve body and the relief valve, and allows the oil to flow from the valve body side to the relief valve side in parallel with the filter in the above oil passage. Since a check valve is provided to block the flow of oil from the relief valve side to the valve body side, even if the filter is clogged, the valve body and the filter are connected via a relatively inexpensive check valve. The high-pressure oil in the communicating oil passage can be guided to the relief valve. Thereby, it is possible to prevent damage to the entire hydraulic circuit while suppressing an increase in the manufacturing cost of the hydraulic drive device including the oil passage and the valve body, and it is possible to realize excellent protection of the hydraulic circuit at a low cost. .

本発明に係る油圧駆動装置が備えられる作業機械の一例として挙げたホイールショベルを示す側面図である。It is a side view which shows the wheel shovel mentioned as an example of the working machine with which the hydraulic drive device which concerns on this invention is provided. 図１に示すホイールショベルに備えられる本実施形態に係る油圧駆動装置を示す油圧回路図である。It is a hydraulic circuit diagram which shows the hydraulic drive device which concerns on this embodiment with which the wheel shovel shown in FIG. 1 is equipped.

以下、本発明に係る作業機械の油圧駆動装置の実施の形態を図に基づいて説明する。   Embodiments of a hydraulic drive device for a work machine according to the present invention will be described below with reference to the drawings.

本実施形態に係る油圧駆動装置が備えられる作業機械は、例えばホイールショベルである。このホイールショベルは、図１に示すように、前輪２及び後輪３を有する走行体１と、この走行体１上に配置される旋回体４と、この旋回体４に上下方向の回動可能に取り付けられる作業装置５とを備えている。作業装置５は、旋回体４に回動可能に設けられるブーム６と、このブーム６の先端に回動可能に設けられるアーム７と、このアーム７の先端に回動可能に設けられるバケット８とを含んでいる。旋回体４上の前側位置には運転室９が配置され、後側位置にはカウンタウエイト１０が配置されている。運転室９とカウンタウエイト１１の間には機械室１１が配置され、この機械室１１内に本実施形態に係る油圧駆動装置の主要部が収容されている。   The work machine provided with the hydraulic drive device according to the present embodiment is, for example, a wheel excavator. As shown in FIG. 1, the wheel excavator includes a traveling body 1 having a front wheel 2 and a rear wheel 3, a revolving body 4 disposed on the traveling body 1, and the revolving body 4 can be rotated in the vertical direction. And a work device 5 attached to the machine. The working device 5 includes a boom 6 that is rotatably provided on the revolving body 4, an arm 7 that is rotatably provided at the tip of the boom 6, and a bucket 8 that is rotatably provided at the tip of the arm 7. Is included. A driver's cab 9 is disposed at the front position on the revolving structure 4 and a counterweight 10 is disposed at the rear position. A machine room 11 is disposed between the cab 9 and the counterweight 11, and the main part of the hydraulic drive device according to the present embodiment is accommodated in the machine room 11.

本実施形態に係る油圧駆動装置は、図２に示すように、油圧ポンプ２０と、この油圧ポンプ２０に連絡されるプライオリティバルブ２１と、このプライオリティバルブ２１に連設され、図示しないステアリングホイールの操作に応じて図示しないステアリングシリンダに圧油を供給するステアリングバルブ２２とを備えている。また、運転室９内に配置されるブレーキペダル２３ａの踏み込み操作に応じて前輪２、後輪３を制動する圧油を図示しないブレーキ装置に供給するブレーキ弁２３と、前輪２、後輪３のそれぞれに対応して一対設けられ、ブレーキ弁２３に供給される圧油を蓄圧するアキュムレータ２４と、上述したプライオリティバルブ２１に油路２６を介して連絡され、アキュムレータ２４に圧油を供給可能なチャージバルブ２５とを備えている。   As shown in FIG. 2, the hydraulic drive apparatus according to the present embodiment includes a hydraulic pump 20, a priority valve 21 connected to the hydraulic pump 20, and an operation of a steering wheel (not shown) connected to the priority valve 21. And a steering valve 22 for supplying pressure oil to a steering cylinder (not shown). Further, the brake valve 23 for supplying pressure oil for braking the front wheel 2 and the rear wheel 3 to a brake device (not shown) according to the depression operation of the brake pedal 23 a disposed in the cab 9, and the front wheel 2 and the rear wheel 3 A pair of accumulators 24 corresponding to the respective accumulators 24 for accumulating pressure oil supplied to the brake valve 23, and a charge capable of supplying pressure oil to the accumulator 24, connected to the above-described priority valve 21 via an oil passage 26. And a valve 25.

油圧ポンプ２０とプライオリティバルブ２１とを連絡する油路３８には、この油路３８を流れる圧油に混入されたゴミを捕集するフィルタ２８と、油圧ポンプ２０側からプライオリティバルブ２１側への圧油の流れを許容させ、プライオリティバルブ２１側から油圧ポンプ２０側への油の流れを阻止する逆止弁２９とを並設させてある。   An oil passage 38 that connects the hydraulic pump 20 and the priority valve 21 includes a filter 28 that collects dust mixed in the pressure oil flowing through the oil passage 38, and a pressure from the hydraulic pump 20 side to the priority valve 21 side. A check valve 29 that allows oil flow and blocks oil flow from the priority valve 21 side to the hydraulic pump 20 side is provided in parallel.

上述したプライオリティバルブ２１は、アキュムレータ２４に圧油を供給可能な切換位置である中立位置２１ａ１と、図示しないステアリングホイールの操作に応じてステアリングバルブ２３に圧油を供給する切換位置である操作位置２１ａ２とを有する方向切換弁２１ａと、この方向切換弁２１ａの切り換え圧力の最高圧力を規定するリリーフ弁２１ｂとを含んでいる。リリーフ弁２１ｂはタンク２７に接続されている。   The priority valve 21 described above is a neutral position 21a1 which is a switching position where pressure oil can be supplied to the accumulator 24, and an operation position 21a2 which is a switching position where pressure oil is supplied to the steering valve 23 in response to an operation of a steering wheel (not shown). And a relief valve 21b that regulates the maximum switching pressure of the direction switching valve 21a. The relief valve 21 b is connected to the tank 27.

上述したステアリングバルブ２２は、図示しないステアリングシリンダに圧油を供給するポンプ部２２ｂと、プライオリティバルブ２１の方向切換弁２１ａを介してポンプ部２２ｂに供給される圧油の流れを制御する方向切換弁２２ａとを含んでいる。方向切換弁２２ａは、ポンプ部２２ｂを正転させる圧油を供給可能にする切換位置２２ａ１と、ポンプ部２２ｂを逆転させる圧油を供給可能にする切換位置２２ａ２と、ポンプ部２２ｂへの圧油の供給を阻止する中立位置２２ａ３とを有している。   The steering valve 22 described above includes a pump unit 22b that supplies pressure oil to a steering cylinder (not shown), and a direction switching valve that controls the flow of pressure oil supplied to the pump unit 22b via the direction switching valve 21a of the priority valve 21. 22a. The direction switching valve 22a includes a switching position 22a1 that enables supply of pressure oil that normally rotates the pump portion 22b, a switching position 22a2 that enables supply of pressure oil that reversely rotates the pump portion 22b, and pressure oil to the pump portion 22b. And a neutral position 22a3 for preventing the supply of.

上述したチャージバルブ２５は、アキュムレータ２４のそれぞれへの圧油の供給を可能にし、アキュムレータ２４側からの圧油の流れを阻止する逆止弁３０，３１と、これらの逆止弁３０，３１方向への圧油の供給を可能にし、逆止弁３０，３１側からの圧油の流れを阻止する逆止弁３２とを含んでいる。また、このチャージバルブ２５は、アキュムレータ２４の圧力が低いときには閉位置３３ａに保持され、アキュムレータ２４の圧力が所定圧まで高くなったときに開位置３３ｂに切り換えられる弁体、すなわち開閉弁３３と、この開閉弁３３の切り換え圧力の最高圧力を規定するリリーフ弁３４とを含んでいる。開閉弁３３及びリリーフ弁３４はタンク２７に接続されている。   The charge valve 25 described above enables the supply of pressure oil to each of the accumulators 24, and checks the flow of pressure oil from the accumulator 24 side, and check valves 30, 31 direction. And a check valve 32 that prevents the flow of pressure oil from the check valves 30 and 31 side. The charge valve 25 is held at the closed position 33a when the pressure of the accumulator 24 is low, and is switched to the open position 33b when the pressure of the accumulator 24 is increased to a predetermined pressure, that is, the on-off valve 33; And a relief valve 34 that regulates the maximum switching pressure of the on-off valve 33. The on-off valve 33 and the relief valve 34 are connected to the tank 27.

また、このチャージバルブ２５は、開閉弁３３とリリーフ弁３４とを連絡する油路３５に設けられ、この油路３５を流れる圧油に混入されたゴミを捕集するフィルタ３６を含んでいる。さらに本実施形態は、チャージバルブ２５が、上述した油路３５に、フィルタ３６に並設させて、開閉弁３３側からリリーフ弁３４側への圧油の流れを許容させ、リリーフ弁３４側から開閉弁３３側への圧油の流れを阻止する逆止弁３７を含む構成にしてある。このような逆止弁３７は一般に、リリーフ弁等に比べて安価であることが知られている。なお、上述したプライオリティバルブ２１とチャージバルブ２５とを連絡する油路２６は、一端がプライオリティバルブ２１の方向切換弁２１ａの出口ポートに接続され、他端がチャージバルブ２５の逆止弁３２と開閉弁３３とを連絡する油路に接続されている。   The charge valve 25 includes a filter 36 that is provided in an oil passage 35 that connects the on-off valve 33 and the relief valve 34, and that collects dust mixed in the pressure oil flowing through the oil passage 35. Furthermore, in the present embodiment, the charge valve 25 is arranged in parallel with the filter 36 in the oil passage 35 described above to allow the flow of pressure oil from the on-off valve 33 side to the relief valve 34 side, and from the relief valve 34 side. A check valve 37 that prevents the flow of pressure oil toward the on-off valve 33 is included. Such a check valve 37 is generally known to be less expensive than a relief valve or the like. Note that the oil passage 26 connecting the priority valve 21 and the charge valve 25 described above has one end connected to the outlet port of the direction switching valve 21a of the priority valve 21 and the other end opened and closed with the check valve 32 of the charge valve 25. An oil passage communicating with the valve 33 is connected.

このように構成した本実施形態は、図示しないステアリングホイールが操作されると、ステアリングバルブ２２ａの方向切換弁２２ａが切換位置２２ａ１，２２ａ２のいずれかの切換位置に切り換えられるとともに、プライオリティバルブ２１の方向切換弁２１ａが操作位置２１ａ側に切り換えられる傾向となる。したがって、油圧ポンプ２０から吐出される圧油の相当量は、フィルタ２８、プライオリティバルブ２１の方向切換弁２１ａの操作位置２１ａ２、ステアリングバルブ２２の方向切換弁２２ａの切換位置２２ａ１または切換位置２２ａ２を介して、ポンプ部２２ｂに供給され、さらにポンプ部２２ｂから図示しないステアリングシリンダに供給される。これにより走行体１の走行方向が決められる。この間、プライオリティバルブ２１の方向切換弁２１ａの切り換え圧力がリリーフ弁２１ｂの設定圧力を越えたときには、リリーフ弁２１ｂが作動し、その設定圧力を越える高圧の圧油がリリーフ弁２１ｂを介してタンク２７に逃がされる。   In this embodiment configured as described above, when a steering wheel (not shown) is operated, the direction switching valve 22a of the steering valve 22a is switched to one of the switching positions 22a1 and 22a2, and the direction of the priority valve 21 is changed. The switching valve 21a tends to be switched to the operation position 21a side. Accordingly, a considerable amount of the pressure oil discharged from the hydraulic pump 20 passes through the filter 28, the operation position 21a2 of the direction switching valve 21a of the priority valve 21, and the switching position 22a1 or the switching position 22a2 of the direction switching valve 22a of the steering valve 22. Then, it is supplied to the pump part 22b, and further supplied from the pump part 22b to a steering cylinder (not shown). Thereby, the traveling direction of the traveling body 1 is determined. During this time, when the switching pressure of the direction switching valve 21a of the priority valve 21 exceeds the set pressure of the relief valve 21b, the relief valve 21b is activated, and high pressure oil exceeding the set pressure passes through the relief valve 21b to the tank 27. To escape.

なお、上述した図示しないステアリングホイールの操作時にあっても、ステアリングホイールの操作量によっては、油圧ポンプ２０から吐出される圧油の一部が、プライオリティバルブ２１の方向切換弁２１ａの中立位置２１ａ１側から油路２６に供給される。したがって、このようなときには、アキュムレータ２４への蓄圧が可能となる。   Even when the steering wheel (not shown) described above is operated, depending on the amount of operation of the steering wheel, a part of the pressure oil discharged from the hydraulic pump 20 is on the neutral position 21a1 side of the direction switching valve 21a of the priority valve 21. To the oil passage 26. Therefore, in such a case, pressure accumulation in the accumulator 24 becomes possible.

また、図示しないステアリングホイールが操作されない状態では、プライオリティバルブ２１の方向切換弁２１ａ１は中立位置２１ａ１に保持される。したがって、油圧ポンプ２０から吐出された圧油は、プライオリティバルブ２１の方向切換弁２１ａ１の切換位置２１ａ１、油路２６を介してチャージバルブ２５に供給される。このとき、アキュムレータ２４の蓄圧が所定圧に満たない状態にあっては、開閉弁３３は閉位置３３ａに保持されており、油圧ポンプ２０の圧油が逆止弁３２、逆止弁３０，３１を介してアキュムレータ２４のそれぞれに供給される。アキュムレータ２４のそれぞれが所定圧まで高くなったときには、開閉弁３３とフィルタ３６との間に位置する油路３５部分に与えられる切り換え圧力によって開閉弁３３は開位置３３ｂに切り換えられる。これにより、所定圧を越える高圧の圧油は開閉弁３３の開位置３３ｂを介してタンク２７に逃がされる。また、上述の切り換え圧力がリリーフ弁３４の設定圧力を越えたときには、リリーフ弁３４が作動し、その設定圧力を越える高圧の圧油がフィルタ３６、リリーフ弁３４を介してタンク２６に逃がされる。   When the steering wheel (not shown) is not operated, the direction switching valve 21a1 of the priority valve 21 is held at the neutral position 21a1. Accordingly, the pressure oil discharged from the hydraulic pump 20 is supplied to the charge valve 25 via the switching position 21 a 1 of the direction switching valve 21 a 1 of the priority valve 21 and the oil passage 26. At this time, if the accumulated pressure of the accumulator 24 is less than the predetermined pressure, the on-off valve 33 is held at the closed position 33a, and the hydraulic oil of the hydraulic pump 20 is supplied with the check valve 32 and the check valves 30, 31. To each of the accumulators 24. When each of the accumulators 24 is increased to a predetermined pressure, the on-off valve 33 is switched to the open position 33b by the switching pressure applied to the oil passage 35 portion located between the on-off valve 33 and the filter 36. As a result, high pressure oil exceeding a predetermined pressure is released to the tank 27 through the open position 33 b of the on-off valve 33. When the switching pressure exceeds the set pressure of the relief valve 34, the relief valve 34 is activated, and high pressure oil exceeding the set pressure is released to the tank 26 via the filter 36 and the relief valve 34.

なお、走行体１の前輪２及び後輪３の駆動によって走行が行なわれているときに、ブレーキペダル２３ａが踏み込まれると、アキュムレータ２４の圧油がブレーキ弁２３を介して図示しないブレーキ装置に供給されて、前輪２及び後輪３に制動力が与えられ、走行体１が停止する。   When the brake pedal 23a is depressed while the vehicle is traveling by driving the front wheels 2 and the rear wheels 3 of the traveling body 1, the pressure oil in the accumulator 24 is supplied to a brake device (not shown) via the brake valve 23. Thus, braking force is applied to the front wheels 2 and the rear wheels 3, and the traveling body 1 stops.

以上のような動作が行なわれる間、油圧ポンプ２０に接続される油路３８に設けたフィルタ２８によって、油路３８を流れる圧油に混入されたゴミが捕集され、油圧ポンプ２０、プライオリティバルブ２１、ステアリングバルブ２２、チャージバルブ２５、アキュムレータ２４、及びブレーキ弁２３等を含むこの油圧回路の上流側を流れる圧油の清浄化が行なわれる。また、チャージバルブ２５の開閉弁３３とリリーフ弁３４とを連絡する油路３５に設けたフィルタ３６によって、油路３５を流れる圧油に混入されたゴミが捕集され、この油圧回路の下流側を流れる圧油の清浄化が行なわれる。すなわち、フィルタ２８とフィルタ３６とによって、この油圧回路を流れる圧油が清浄に保たれ、プライオリティバルブ２１、ステアリングバルブ２２、チャージバルブ２５、ブレーキ弁２３等を含む各油圧機器の良好な作動性能が維持される。   While the operation as described above is performed, the dust mixed in the pressure oil flowing through the oil passage 38 is collected by the filter 28 provided in the oil passage 38 connected to the hydraulic pump 20, and the hydraulic pump 20, the priority valve 21, the pressure oil flowing upstream of the hydraulic circuit including the steering valve 22, the charge valve 25, the accumulator 24, the brake valve 23, and the like is cleaned. Further, dust mixed in the pressure oil flowing in the oil passage 35 is collected by a filter 36 provided in the oil passage 35 that connects the on-off valve 33 and the relief valve 34 of the charge valve 25, and downstream of the hydraulic circuit. The pressure oil flowing through is cleaned. That is, the pressure oil flowing through this hydraulic circuit is kept clean by the filter 28 and the filter 36, and the good operating performance of each hydraulic device including the priority valve 21, the steering valve 22, the charge valve 25, the brake valve 23, etc. Maintained.

そして、油圧ポンプ２０とプライオリティバルブ２１とを接続する油路３８に設けたフィルタ２８に目詰まりを生じ、このフィルタ２８を圧油が通過しにくくなったときには、油圧ポンプ２０の圧油がフィルタ２８に並設された逆止弁２９を介してプライオリティバルブ２１に供給される。したがって、油路３８を流れる圧油の清浄化機能は衰えるものの、油圧回路全体の破損を防止しながら、所望の動作を継続して実施させることができる。また、チャージバルブ２５の開閉弁３３とリリーフ弁３４とを連絡する油路３５に設けたフィルタ３６に目詰まりを生じ、このフィルタ３６を圧油が通過しにくくなったときには、開閉弁３３とフィルタ３６との間に位置する油路３５部分の圧油がフィルタ３６に並設された逆止弁３７を介してリリーフ弁３４に供給される。したがって、この圧油の圧力がリリーフ弁３４の設定圧力を越える高圧となったときには、リリーフ弁３４が作動し、その設定圧力を越える高圧の圧油がタンク２７に逃がされる。したがって、油路３５を流れる圧油の清浄化機能は衰えるものの、開閉弁３３とフィルタ３６間の油路３５部分に発生する高圧の圧油による油路３５、開閉弁３３、油圧ポンプ２０等を含む油圧回路全体の破損を確実に防止することができる。 When the filter 28 provided in the oil passage 38 connecting the hydraulic pump 20 and the priority valve 21 is clogged and it becomes difficult for the pressure oil to pass through the filter 28, the pressure oil of the hydraulic pump 20 is filtered. Are supplied to the priority valve 21 through a check valve 29 arranged in parallel. Therefore, although the function of purifying the pressure oil flowing through the oil passage 38 deteriorates, the desired operation can be continuously performed while preventing the entire hydraulic circuit from being damaged. Further, when the filter 36 provided in the oil passage 35 connecting the on-off valve 33 and the relief valve 34 of the charge valve 25 is clogged and it becomes difficult for the pressure oil to pass through the filter 36, the on-off valve 33 and the filter The pressure oil in the portion of the oil passage 35 located between the pressure and the fluid is supplied to the relief valve 34 via a check valve 37 provided in parallel with the filter 36. Accordingly, when the pressure of the pressure oil becomes a high pressure exceeding the set pressure of the relief valve 34, the relief valve 34 is operated, and the high pressure oil exceeding the set pressure is released to the tank 27. Accordingly, although the function of purifying the pressure oil flowing through the oil passage 35 deteriorates, the oil passage 35, the on-off valve 33, the hydraulic pump 20 and the like due to the high pressure oil generated in the oil passage 35 portion between the on-off valve 33 and the filter 36 are provided. It is possible to reliably prevent the entire hydraulic circuit including the damage.

上述したように、本実施形態によれば、開閉弁３３とリリーフ弁３４とを連絡する油路３５に配置されたフィルタ３６に目詰まりを生じ、開閉弁３３とフィルタ３６とを連絡する油路３５部分が高圧となったときには、フィルタ３６に並設された比較的安価である逆止弁、すなわち一般にリリーフ弁等よりも安価とされている逆止弁３７を介してリリーフ弁３４に圧油を導き、このリリーフ弁３４の作動によって高圧の圧油を逃がすことができる。これにより、上述したようにフィルタ３６による圧油の清浄化機能は衰えるものの、当該油路３５、開閉弁３３を含む当該油圧駆動装置の製作コストが高くなることを抑えながら油圧回路全体の破損を防ぐことができ、優れた油圧回路の保護を低コストで実現させることができる。   As described above, according to this embodiment, the filter 36 disposed in the oil passage 35 that connects the on-off valve 33 and the relief valve 34 is clogged, and the oil passage that connects the on-off valve 33 and the filter 36. When the portion 35 becomes high pressure, pressure oil is supplied to the relief valve 34 via a relatively inexpensive check valve provided in parallel with the filter 36, that is, a check valve 37 that is generally less expensive than a relief valve or the like. Thus, the operation of the relief valve 34 allows high pressure oil to escape. As a result, although the pressure oil cleaning function by the filter 36 declines as described above, the entire hydraulic circuit is damaged while suppressing an increase in the manufacturing cost of the hydraulic drive device including the oil passage 35 and the on-off valve 33. Therefore, excellent protection of the hydraulic circuit can be realized at low cost.

なお、上記実施形態は、チャージバルブ２５に含まれる開閉弁３３とリリーフ弁３４とを連絡する油路３５に、フィルタ３６と逆止弁３７とを並設させた構成にしてあるが、プライオリティバルブ２１の方向切換弁２１ａとリリーフ弁２１ｂとを連絡する油路に、フィルタと逆止弁とを並設させた構成にしてもよい。このように構成したものでは、方向切換弁３３とリリーフ弁２１ｂとを連絡する油路を流れる圧油の清浄化を実現させることができるとともに、フィルタに目詰まりを生じた際に、方向切換弁３３とフィルタとを連絡する油路部分の高圧の圧油を、逆止弁を介してリリーフ弁２１ｂに導き、このリリーフ弁２１ｂを作動させてタンク２７に逃がすことができる。すなわち、方向切換弁２１ａ、油圧ポンプ２０等を含む油圧回路全体の破損を安価な逆止弁を設けることによって防止できる。   In the above embodiment, the filter 36 and the check valve 37 are arranged in parallel to the oil passage 35 that connects the on-off valve 33 and the relief valve 34 included in the charge valve 25. However, the priority valve A filter and a check valve may be arranged in parallel in an oil passage that connects the direction switching valve 21a and the relief valve 21b. With this configuration, it is possible to realize the cleaning of the pressure oil flowing through the oil passage connecting the direction switching valve 33 and the relief valve 21b, and the direction switching valve when the filter is clogged. The high pressure oil in the oil passage portion that communicates with the filter 33 can be guided to the relief valve 21b via the check valve, and the relief valve 21b can be operated to escape to the tank 27. That is, damage to the entire hydraulic circuit including the direction switching valve 21a and the hydraulic pump 20 can be prevented by providing an inexpensive check valve.

また、上記実施形態は、ホイールショベルに備えた構成にしてあるが、本発明は、作業機械がホイールショベルであることには限定されない。例えば、ホイールローダに本実施形態を備えるように構成してもよい。   Moreover, although the said embodiment is set as the structure with which the wheel excavator was equipped, this invention is not limited to a work machine being a wheel excavator. For example, you may comprise so that a wheel loader may be provided with this embodiment.

１ 走行体
４ 旋回体
５ 作業装置
２０ 油圧ポンプ
２１ プライオリティバルブ
２２ ステアリングバルブ
２３ ブレーキ弁
２４ アキュムレータ
２５ チャージバルブ（バルブ）
２６ 油路
２７ タンク
３３ 開閉弁（弁体）
３４ リリーフ弁
３５ 油路
３６ フィルタ（別のフィルタ）
３７ 逆止弁（別の逆止弁）
３８ 油路（別の油路） DESCRIPTION OF SYMBOLS 1 Traveling body 4 Revolving body 5 Working device 20 Hydraulic pump 21 Priority valve 22 Steering valve 23 Brake valve 24 Accumulator 25 Charge valve (valve)
26 Oil passage 27 Tank 33 On-off valve (valve)
34 Relief valve 35 Oil passage 36 Filter (another filter)
37 Check valve (another check valve)
38 Oilway (another oilway)

Claims (2)

油圧ポンプと、この油圧ポンプから吐出される圧油に応じて切り換えられる弁体と、この弁体の切り換え圧力の最高圧力を規定するリリーフ弁と、上記弁体と上記リリーフ弁とを連絡する油路に設けられるフィルタとを備えた作業機械の油圧駆動装置において、
上記油路に、上記フィルタに並設させて、上記弁体側から上記リリーフ弁側への油の流れを許容させ、上記リリーフ弁側から上記弁体側への油の流れを阻止する逆止弁を設け、
上記油圧ポンプから吐出される圧油が供給されるバルブを備え、このバルブ内に、上記弁体、上記リリーフ弁、上記油路、上記フィルタ、及び上記逆止弁を設け、
ブレーキ弁と、このブレーキ弁に圧油を供給可能なアキュムレータとを備え、
上記バルブが、上記アキュムレータに圧油を供給可能なチャージバルブから成り、
上記弁体が、上記アキュムレータの蓄圧が所定圧より高くなったときに、その高圧の圧油を逃がすことが可能な開閉弁から成ることを特徴とする作業機械の油圧駆動装置。 A hydraulic pump, a valve body that is switched according to the pressure oil discharged from the hydraulic pump, a relief valve that defines the maximum switching pressure of the valve body, and an oil that communicates the valve body and the relief valve In a hydraulic drive device for a work machine provided with a filter provided on a road,
A check valve that is arranged in parallel with the filter in the oil passage to allow the flow of oil from the valve body side to the relief valve side and to block the oil flow from the relief valve side to the valve body side. Provided ,
A valve to which pressure oil discharged from the hydraulic pump is supplied, and the valve body, the relief valve, the oil passage, the filter, and the check valve are provided in the valve;
A brake valve and an accumulator capable of supplying pressure oil to the brake valve;
The valve comprises a charge valve capable of supplying pressure oil to the accumulator;
A hydraulic drive device for a working machine, wherein the valve body is composed of an on-off valve capable of releasing the high pressure oil when the accumulated pressure of the accumulator becomes higher than a predetermined pressure . 請求項１に記載の作業機械の油圧駆動装置において、
上記作業機械がホイールショベルから成り、
上記油圧ポンプから吐出される圧油が供給されるプライオリティバルブとステアリングバルブとを備え、
上記プライオリティバルブを介して上記チャージバルブに圧油を導く油路を設けるとともに、
上記油圧ポンプと上記プライオリティバルブを連絡する別の油路に別のフィルタを設け、上記別の油路に、上記別のフィルタに並設させて、上記油圧ポンプ側から上記プライオリティバルブ側への油の流れを許容させ、上記プライオリティバルブ側から上記油圧ポンプ側への油の流れを阻止する逆止弁を配置したことを特徴とする作業機械の油圧駆動装置。 The hydraulic drive device for a work machine according to claim 1,
The work machine consists of a wheel excavator,
A priority valve to which pressure oil discharged from the hydraulic pump is supplied and a steering valve;
While providing an oil passage for leading pressure oil to the charge valve via the priority valve,
A separate filter is provided in another oil passage connecting the hydraulic pump and the priority valve, and the other oil passage is provided in parallel with the other filter so that oil from the hydraulic pump side to the priority valve side is provided. A hydraulic drive device for a working machine, wherein a check valve is disposed to allow the flow of oil and prevent the flow of oil from the priority valve side to the hydraulic pump side .
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