JPH0635607U - Filter device with protection circuit - Google Patents
Filter device with protection circuitInfo
- Publication number
- JPH0635607U JPH0635607U JP7723592U JP7723592U JPH0635607U JP H0635607 U JPH0635607 U JP H0635607U JP 7723592 U JP7723592 U JP 7723592U JP 7723592 U JP7723592 U JP 7723592U JP H0635607 U JPH0635607 U JP H0635607U
- Authority
- JP
- Japan
- Prior art keywords
- filter
- relief valve
- hydraulic
- hydraulic oil
- hydraulic circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- Fluid-Pressure Circuits (AREA)
Abstract
(57)【要約】
【目的】 この考案は、製造コストの上昇を抑えると共
に、フィルタ装置の耐圧強度を引き上げることなく濾過
した作動油のみを油圧回路に供給可能な保護回路付フィ
ルタ装置を目的にしている。
【構成】 ポンプ２と油圧回路６との間に介装されるフ
ィルタ装置において、インラインフィルタ３にバイパス
としてリリーフ弁４を並列に設けると共に、リリーフ弁
４の上流又は下流の少なくとも一方側に第２フィルタ５
を直列に設け、油圧回路６に濾過されていない作動油が
侵入するのを防止することを特徴としている。
(57) [Summary] [Object] The present invention aims at a filter device with a protection circuit that suppresses an increase in manufacturing cost and that can supply only filtered hydraulic oil to a hydraulic circuit without increasing the pressure resistance of the filter device. ing. In a filter device interposed between a pump 2 and a hydraulic circuit 6, a relief valve 4 is provided in parallel with an in-line filter 3 as a bypass, and a second relief valve 4 is provided on at least one side upstream or downstream of the relief valve 4. Filter 5
Are provided in series to prevent hydraulic fluid that has not been filtered from entering the hydraulic circuit 6.
Description
【０００１】[0001]
この考案は、油圧機器等に供給する作動油を濾過するフィルタ装置の改良に係 る保護回路付フィルタ装置に関するものである。 The present invention relates to a filter device with a protection circuit for improving a filter device for filtering hydraulic oil supplied to hydraulic equipment and the like.
【０００２】[0002]
従来のフィルタ装置は、図５に示すようにポンプ２と油圧回路６との間に介装 されるインラインフィルタ３に、バイパスとしてリリーフ弁４を設けたものが知 られている。 As a conventional filter device, it is known that a relief valve 4 is provided as a bypass in an in-line filter 3 interposed between a pump 2 and a hydraulic circuit 6, as shown in FIG.
【０００３】 この装置は、タンク１の作動油をポンプ２で吸い上げると共に、インラインフ ィルタ３に圧送して濾過した作動油を油圧回路６に圧送するもので、インライン フィルタ３と並列に設けたリリーフ弁４はインラインフィルタ３の目詰まり等で 作動油がインラインフィルタ３を通過する際の抵抗が所定の値を越えると開弁し 、ポンプ２で圧送した作動油はインラインフィルタ３を通さずにそのまま油圧回 路６へ放出してインラインフィルタ３に耐圧を越える油圧が加わるのを防いでい る。This device sucks up the hydraulic oil in the tank 1 with a pump 2 and also pumps the hydraulic oil that has been filtered by sending it to an inline filter 3 to a hydraulic circuit 6. A relief provided in parallel with the inline filter 3 The valve 4 opens when the resistance of hydraulic oil passing through the inline filter 3 exceeds a predetermined value due to clogging of the inline filter 3, etc., and the hydraulic oil pumped by the pump 2 does not pass through the inline filter 3 and remains as it is. It prevents the hydraulic pressure from being discharged to the hydraulic circuit 6 and exceeding the withstand pressure being applied to the in-line filter 3.
【０００４】[0004]
しかし、前記従来の技術では、Ａ．インラインフィルタ３が正常な状態であっ ても、油圧回路６の始動直後等作動油の温度が低いときには作動油の粘度が高い ために、インラインフィルタ３を通過する抵抗が増大して油圧が所定の値を越え るとリリーフ弁４が開弁する。 However, in the above-mentioned conventional technique, A. Even when the in-line filter 3 is in a normal state, when the temperature of the hydraulic oil is low such as immediately after the hydraulic circuit 6 is started, the viscosity of the hydraulic oil is high, so that the resistance passing through the in-line filter 3 increases and the hydraulic pressure is kept at a predetermined level. When the value is exceeded, the relief valve 4 opens.
【０００５】 この結果、接続された油圧回路６には濾過されていない作動油が供給され、油 圧回路６中にサーボ弁などを備えていなければ作動油中のゴミにより汚染されて 故障を引き起こす原因になるという問題点がある。As a result, hydraulic oil that has not been filtered is supplied to the connected hydraulic circuit 6, and unless a hydraulic valve 6 is provided in the hydraulic circuit 6, the hydraulic circuit 6 is contaminated by dust in the hydraulic oil and causes a failure. There is a problem that it becomes a cause.
【０００６】 Ｂ．また、リリーフ弁４を廃止した状態で常時作動油の全量を濾過するには、 耐圧強度の高い金属メッシユフィルタを使用することにより作動油の濾過が可能 となるが、該金属メッシユフィルタは高価であるためにフィルタ装置の製造コス トを大幅に上昇させてしまうという問題点がある。B. Further, in order to filter the entire amount of hydraulic oil at all times with the relief valve 4 abolished, it is possible to filter the hydraulic oil by using a metal mesh filter having high pressure resistance strength. Since it is expensive, there is a problem that the manufacturing cost of the filter device is significantly increased.
【０００７】 そこで、本考案は製造コストの上昇を抑えると共に、フィルタ装置の耐圧強度 を引き上げることなく濾過した作動油のみを油圧回路に供給可能な保護回路付フ ィルタ装置の提供を目的としている。[0007] Therefore, an object of the present invention is to provide a filter device with a protection circuit that suppresses an increase in manufacturing cost and can supply only filtered hydraulic oil to a hydraulic circuit without increasing the pressure resistance of the filter device.
【０００８】[0008]
上記目的を達成するために、本考案における保護回路付フィルタ装置において は、ポンプと油圧回路との間に介装されるフィルタ装置において、インラインフ ィルタにバイパスとしてリリーフ弁を並列に設けると共に、リリーフ弁の上流又 は下流の少なくとも一方側に第２フィルタを直列に設け、油圧回路に濾過されて いない作動油が侵入するのを防止することを特徴としている。 To achieve the above object, in a filter device with a protection circuit according to the present invention, in a filter device interposed between a pump and a hydraulic circuit, a relief valve is provided in parallel as a bypass to an in-line filter, and a relief valve is provided. A second filter is provided in series on at least one side upstream or downstream of the valve to prevent the unfiltered hydraulic oil from entering the hydraulic circuit.
【０００９】[0009]
インラインフィルタにバイパスとしてリリーフ弁を並列に設け、更にリリーフ 弁と直列に濾過性能を下げ流れ易い第２フィルタを設けたため、インラインフィ ルタを通過せず、リリーフ弁側を通過して油圧回路へ圧送される作動油も濾過さ れる。 A relief valve was installed in parallel as a bypass in the inline filter, and a second filter was installed in series with the relief valve to reduce filtration performance and facilitate flow. The hydraulic oil that is discharged is also filtered.
【００１０】[0010]
実施例について図面を参照して説明すると、図１は保護回路付フィルタ装置の 第１実施例断面図、第２図は同実施例の回路図をあらわしている。 An embodiment will be described with reference to the drawings. FIG. 1 shows a sectional view of a filter device with a protection circuit according to a first embodiment, and FIG. 2 shows a circuit diagram of the same embodiment.
【００１１】 本考案は、ポンプ２と油圧回路６との間に介装されるフィルタ装置に関するも のである。The present invention relates to a filter device interposed between the pump 2 and the hydraulic circuit 6.
【００１２】 ところで、ポンプ２より圧送された作動油は、インラインフィルタ３のフィル タエレメント３２を通過して濾過された後、油圧回路６に圧送されるが、作動油 の低温時やフィルタエレメント３２の目詰まり等が原因で、作動油はフィルタエ レメント５２を通過する際の抵抗が増大してフィルタエレメント３２の上流と下 流の差圧が予め設定した値を越えると、フィルタエレメント３２と並列に設けた リリーフ弁４が開弁し、作動油の一部はそこを通過して油圧回路６に圧送される 。By the way, the hydraulic oil pumped from the pump 2 passes through the filter element 32 of the in-line filter 3 and is filtered, and then pumped to the hydraulic circuit 6. When the hydraulic oil increases in resistance when passing through the filter element 52 due to clogging of the filter element 52 and the differential pressure between the upstream and the downstream of the filter element 32 exceeds a preset value, the hydraulic oil is paralleled to the filter element 32. The relief valve 4 provided is opened, and a part of the hydraulic oil passes therethrough and is pumped to the hydraulic circuit 6.
【００１３】 そこで、インラインフィルタ３の上流と下流の差圧で開弁するリリーフ弁４は 、インラインフィルタ３のバイパスとして並列に設けられている。Therefore, the relief valve 4 that opens with a pressure difference between the upstream side and the downstream side of the inline filter 3 is provided in parallel as a bypass of the inline filter 3.
【００１４】 さらに、第２フィルタ５は、インラインフィルタ３を通過せずにリリーフ弁４ 側を通過して油圧回路６へ圧送される作動油を濾過するもので、この第２フィル タ５は、前記リリーフ弁４の上流又は下流の少なくともいずれか一方側に直列に 設けられている。Further, the second filter 5 is for filtering the hydraulic oil that is not passed through the in-line filter 3 but passes through the relief valve 4 side and is pressure-fed to the hydraulic circuit 6. The second filter 5 is It is provided in series on at least one of the upstream side and the downstream side of the relief valve 4.
【００１５】 構造上フィルタ装置は、図１にあらわしたように、ポンプ２から圧送される作 動油を受ける入口５１と隔壁５３を介して油圧回路６に圧送する出口５４が設け られ、インラインフィルタ３は、フィルタボデイ３１内にフィルタエレメント３ ２が配置されている。As shown in FIG. 1, the structural filter device is provided with an inlet 51 for receiving the hydraulic oil pumped from the pump 2 and an outlet 54 for pumping the hydraulic oil to the hydraulic circuit 6 via the partition wall 53, and the in-line filter device is provided. 3, the filter element 32 is arranged in the filter body 31.
【００１６】 また、リリーフ弁４は、スチールボール４２とバルブシート４３とスプリング ４１とから構成され、第２フィルタ５はリリーフ弁４の上部に配置されている。The relief valve 4 is composed of a steel ball 42, a valve seat 43, and a spring 41, and the second filter 5 is arranged above the relief valve 4.
【００１７】 また、前記第２フィルタ５は、図４のようにメツシュ５２で製作されている。The second filter 5 is made of a mesh 52 as shown in FIG.
【００１８】 図３の第２実施例は、図１の第１実施例に対し、リリーフ弁４と第２フィルタ ５の配置位置関係を上下流逆に配置したものである。The second embodiment of FIG. 3 is such that the relief valve 4 and the second filter 5 are arranged such that the positional relationship between the relief valve 4 and the second filter 5 is opposite to that of the first embodiment of FIG.
【００１９】 なお、第２実施例の場合は、リリーフ弁４に対するゴミの汚染は考慮されてい ないが、設計の優位性でリリーフ弁４と第２フィルタ５の配置位置関係が決定さ れる。In the case of the second embodiment, the contamination of dust on the relief valve 4 is not taken into consideration, but the positional relationship between the relief valve 4 and the second filter 5 is determined by the design advantage.
【００２０】[0020]
本考案は上述の通り構成されているので、インラインフィルタの上流と下流の 差圧が予め設定した値を越えるとリリーフ弁が開弁し、作動油の一部をインライ ンフィルタを通さずに油圧回路へ圧送するため、インラインフィルタの耐圧限界 を越えない様に保護することができる。 Since the present invention is configured as described above, the relief valve opens when the pressure difference between the upstream side and the downstream side of the inline filter exceeds a preset value, and a portion of the hydraulic oil is hydraulically pumped without passing through the inline filter. Since the pressure is fed to the circuit, it is possible to protect the inline filter from exceeding the withstand voltage limit.
【００２１】 更にインラインフィルタを通過しない作動油は第２フィルタで濾過されて油圧 回路に圧送されるため、油圧回路へ濾過されていない作動油が流入することなく 、油圧回路をゴミ等の汚染から保護することができる。Further, the hydraulic oil that does not pass through the in-line filter is filtered by the second filter and sent under pressure to the hydraulic circuit, so that the unfiltered hydraulic oil does not flow into the hydraulic circuit and the hydraulic circuit is protected from contamination such as dust. Can be protected.
【提出日】平成５年５月３１日[Submission date] May 31, 1993
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００４[Correction target item name] 0004
【補正方法】変更[Correction method] Change
【０００４】[0004]
【考案が解決しようとする課題】 しかし、前記従来の技術では、Ａ．インライ ンフィルタ３が正常な状態であっても、始動直後等作動油の温度が低いときには 作動油の粘度が高いために、インラインフィルタ３を通過する抵抗が増大して油 圧が所定の値を超えるとリリーフ弁４が開弁する。However, in the above-mentioned conventional technique, the A. Even when the in-line filter 3 is in a normal state, when the temperature of the hydraulic oil is low, such as immediately after starting, the viscosity of the hydraulic oil is high, so the resistance passing through the in-line filter 3 increases and the hydraulic pressure reaches a predetermined value. When it exceeds, the relief valve 4 opens.
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００５[Name of item to be corrected] 0005
【補正方法】変更[Correction method] Change
【０００５】 この結果、接続された油圧回路６には濾過されていない作 動油が供給され、油圧回路６中に備えたサーボ弁等の油圧機構が作動油中のゴミ により汚染されて故障を引き起す原因になるという問題点がある。As a result, operating oil that has not been filtered is supplied to the connected hydraulic circuit 6, and a hydraulic mechanism such as a servo valve provided in the hydraulic circuit 6 is contaminated by dust in the hydraulic oil, causing a failure. There is a problem that it causes it.
【手続補正３】[Procedure 3]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１２[Correction target item name] 0012
【補正方法】変更[Correction method] Change
【００１２】 ところで、ポンプ２より圧送された作動油は、インライン フィルタ３のフィルタエレメント３２を通過して濾過された後、油圧回路６に圧 送されるが、作動油の低温時やフィルタエレメント３２の目詰まり等が原因で、 作動油はフィルタエレメント３２を通過する際の抵抗が増大してフィルタエレメ ント３２の上流と下流の差圧が予め設定した値を超えると、フィルタエレメント ３２と並列に設けたリリーフ弁４が開弁し、作動油の一部はそこを通過して油圧 回路６に圧送される。By the way, the hydraulic oil pumped from the pump 2 passes through the filter element 32 of the in-line filter 3 and is filtered, and then pumped to the hydraulic circuit 6. If the hydraulic oil increases in resistance when passing through the filter element 32 due to clogging of the filter element and the differential pressure between the upstream and the downstream of the filter element 32 exceeds a preset value, the hydraulic oil is paralleled to the filter element 32. The relief valve 4 provided is opened, and a part of the hydraulic oil passes therethrough and is pumped to the hydraulic circuit 6.
【図１】本考案のフイルタ装置の第１実施例の断面図で
ある。FIG. 1 is a sectional view of a first embodiment of a filter device according to the present invention.
【図２】本考案装置の第１実施例の回路図である。FIG. 2 is a circuit diagram of a first embodiment of the device of the present invention.
【図３】本考案の第２実施例の回路図である。FIG. 3 is a circuit diagram of a second embodiment of the present invention.
【図４】第２フィルターの斜視図である。FIG. 4 is a perspective view of a second filter.
【図５】従来の装置の油圧回路図である。FIG. 5 is a hydraulic circuit diagram of a conventional device.
１ タンク ２ ポンプ ３ インラインフィルタ ４ リリーフ弁 ５ 第２フィルタ ６ 油圧回路 1 tank 2 pump 3 in-line filter 4 relief valve 5 second filter 6 hydraulic circuit
Claims (1)
ィルタ装置において、インラインフィルタにバイパスと
してリリーフ弁を並列に設けると共に、リリーフ弁の上
流又は下流の少なくとも一方側に第２フィルタを直列に
設け、油圧回路に濾過されていない作動油が侵入するの
を防止することを特徴とする保護回路付フィルタ装置。1. In a filter device interposed between a pump and a hydraulic circuit, a relief valve is provided in parallel with an in-line filter as a bypass, and a second filter is connected in series on at least one side upstream or downstream of the relief valve. A filter device with a protection circuit, which is provided on the hydraulic circuit to prevent unfiltered hydraulic oil from entering the hydraulic circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7723592U JPH0635607U (en) | 1992-10-12 | 1992-10-12 | Filter device with protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7723592U JPH0635607U (en) | 1992-10-12 | 1992-10-12 | Filter device with protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0635607U true JPH0635607U (en) | 1994-05-13 |
Family
ID=13628208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7723592U Pending JPH0635607U (en) | 1992-10-12 | 1992-10-12 | Filter device with protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0635607U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012125722A (en) * | 2010-12-16 | 2012-07-05 | Mahle Filter Systems Japan Corp | Oil filter |
| EP2636910A4 (en) * | 2010-11-05 | 2016-07-13 | Hitachi Construction Machinery | Hydraulic drive device for construction machine |
| EP3564558A1 (en) * | 2018-05-01 | 2019-11-06 | Bell Helicopter Textron Inc. | Bypass block for unregulated gearboxes |
-
1992
- 1992-10-12 JP JP7723592U patent/JPH0635607U/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2636910A4 (en) * | 2010-11-05 | 2016-07-13 | Hitachi Construction Machinery | Hydraulic drive device for construction machine |
| JP2012125722A (en) * | 2010-12-16 | 2012-07-05 | Mahle Filter Systems Japan Corp | Oil filter |
| EP3564558A1 (en) * | 2018-05-01 | 2019-11-06 | Bell Helicopter Textron Inc. | Bypass block for unregulated gearboxes |
| US11209079B2 (en) | 2018-05-01 | 2021-12-28 | Textron Innovations Inc. | Bypass block for unregulated gearboxes |
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