JPH0433444Y2

JPH0433444Y2 -

Info

Publication number: JPH0433444Y2
Application number: JP19180686U
Authority: JP
Priority date: 1986-12-15
Filing date: 1986-12-15
Publication date: 1992-08-11
Also published as: JPS6397702U

Description

【考案の詳細な説明】［産業上の利用分野］本考案は空気の抜けを改善した油タンクに関す
るものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an oil tank with improved air release.

［従来の技術］実開昭59−110403号公報に開示されるように、
油圧ユニツトの油タンクの油はフイルタを経て油
圧ポンプへ吸い込まれ、フイルタが目詰りした場
合にはリリーフ弁が開いて油タンクの油がフイル
タを通らないで油圧ポンプへ吸い込まれる。油圧
ユニツトの組み付け時に除去されなかつた油圧回
路の内部の空気は、最終的には油タンクへ戻され
る。フイルタの内部は油圧ポンプの吸込み圧を受
けるので、フイルタの内部に空気が溜りやすく、
フイルタの内部の空気量が多くなると、油圧ポン
プが空転し、油圧ポンプを駆動する電動機が加熱
焼損する恐れがある。[Prior art] As disclosed in Utility Model Application Publication No. 59-110403,
Oil in the oil tank of the hydraulic unit is sucked into the hydraulic pump through a filter, and if the filter becomes clogged, a relief valve opens and the oil in the oil tank is sucked into the hydraulic pump without passing through the filter. Air inside the hydraulic circuit that is not removed during assembly of the hydraulic unit is eventually returned to the oil tank. Since the inside of the filter receives suction pressure from the hydraulic pump, air tends to accumulate inside the filter.
If the amount of air inside the filter increases, the hydraulic pump may idle and the electric motor that drives the hydraulic pump may heat up and burn out.

［考案が解決しようとする問題点］そこで、本考案の目的は油圧ポンプの停止中に
フイルタの内部の空気が抜け易いようにした油タ
ンクを提供することにある。[Problems to be Solved by the Invention] Therefore, an object of the present invention is to provide an oil tank that allows the air inside the filter to escape easily while the hydraulic pump is stopped.

［問題を解決するための手段］上記目的を達成するために、本考案の構成は油
タンクの内部に収容した環状のフイルタの上下端
部に端板を結合して室を区画し、下端板に前記室
を油圧ポンプの吸込口へ連通する出口を設け、上
端板に油圧ポンプの停止時開く空気抜き弁を備
え、空気抜き弁は上端板に設けた空気抜き用の穴
を囲むように上端板の下面に結合したハウジング
と、ハウジングの内部にあつて前記室に作用する
吸込み圧により、ハウジングの底壁の弁穴へ係合
されるフロートとから構成したものである。[Means for solving the problem] In order to achieve the above object, the configuration of the present invention is such that end plates are connected to the upper and lower ends of an annular filter housed inside an oil tank to partition a chamber, and the lower end plate An outlet is provided for communicating the chamber with the suction port of the hydraulic pump, and the upper end plate is provided with an air vent valve that opens when the hydraulic pump is stopped. and a float located inside the housing and engaged with a valve hole in the bottom wall of the housing by suction pressure acting on the chamber.

［作用］油圧ポンプが停止すると、フイルタの内部の圧
力は大気圧になるので、フロートが弁穴から浮き
上がり、フイルタの内部の室が油タンクの内部と
連通され、フイルタの内部の空気が空気逃し弁を
経て油タンクの内部へ排出される。[Operation] When the hydraulic pump stops, the pressure inside the filter becomes atmospheric pressure, so the float rises from the valve hole, the chamber inside the filter communicates with the inside of the oil tank, and the air inside the filter is released. It is discharged into the oil tank via a valve.

［考案の実施例］第１図に示すように、油タンク７の底部に円筒
形または箱形のフイルタ２が収容され、フイルタ
２の上下両端部は端板３，１０により閉鎖され
る。底壁７ａに戻り口８が設けられる一方、底壁
７ａと端板１０を貫通してフイルタ２の内部に連
通する出口９が、図示してない油圧ポンプの吸込
口に連通される。上側の端板３にリリーフ弁２２
と空気逃し弁２１が設けられる。リリーフ弁２２
は端板３の弁穴６を囲むように端板３に結合した
ハウジング１５の内部に、ばね１７およびばね１
７により弁穴６に付勢係合される弁板５を収容し
て構成される。フイルタ２が目詰りを起すと、フ
イルタ２の内部の室２０の圧力低下に伴つて弁板
５がばね１７の力に抗して下方へ吸引され、油タ
ンク７の油が弁穴６、穴１６を経てフイルタ２の
内部へ流入する。[Embodiment of the invention] As shown in FIG. 1, a cylindrical or box-shaped filter 2 is housed at the bottom of an oil tank 7, and both upper and lower ends of the filter 2 are closed by end plates 3 and 10. A return port 8 is provided in the bottom wall 7a, while an outlet 9 that passes through the bottom wall 7a and the end plate 10 and communicates with the inside of the filter 2 is communicated with a suction port of a hydraulic pump (not shown). Relief valve 22 on the upper end plate 3
and an air relief valve 21 are provided. Relief valve 22
A spring 17 and a spring 1 are installed inside a housing 15 connected to the end plate 3 so as to surround the valve hole 6 of the end plate 3.
7 accommodates a valve plate 5 which is forcefully engaged with a valve hole 6. When the filter 2 becomes clogged, the pressure in the chamber 20 inside the filter 2 decreases and the valve plate 5 is sucked downward against the force of the spring 17, causing oil in the oil tank 7 to drain into the valve hole 6 and the hole. It flows into the inside of the filter 2 through 16.

本考案によれば、空気逃し弁２１が端板３に設
けた穴４を取り囲むハウジング１４の内部に球形
のフロート１２を収容して構成され、フロート１
２がハウジング１４の弁穴１３に係合可能に構成
される。 According to the present invention, the air relief valve 21 is constructed by accommodating the spherical float 12 inside the housing 14 surrounding the hole 4 provided in the end plate 3.
2 is configured to be able to engage with the valve hole 13 of the housing 14.

なお、油タンク７の上端部は閉鎖されかつキヤ
ツプに設けた呼気孔を経て大気に連通されるかま
たはダイアフラムにより密閉される。 The upper end of the oil tank 7 is closed and communicated with the atmosphere through an exhalation hole provided in the cap, or sealed with a diaphragm.

図示してない油圧ポンプが駆動されると、油タ
ンク７の油はフイルタ２を経て室２０へ流入し、
出口９から油圧ポンプへ吸い込まれる。フイルタ
２の流体抵抗と油圧ポンプの吸込み圧により、室
２０の圧力が低下するので、フロート１２は下方
へ吸引されて弁穴１３を閉じる。油圧ポンプから
油圧回路へ送られた油は戻り口８から油タンク７
へ戻される。 When a hydraulic pump (not shown) is driven, oil in the oil tank 7 flows into the chamber 20 through the filter 2.
It is sucked into the hydraulic pump through outlet 9. The pressure in the chamber 20 decreases due to the fluid resistance of the filter 2 and the suction pressure of the hydraulic pump, so the float 12 is sucked downward and closes the valve hole 13. The oil sent from the hydraulic pump to the hydraulic circuit is sent from the return port 8 to the oil tank 7.
be returned to.

フイルタ２の内部の室２０は油圧ポンプの吸込
み圧が作用し、大気圧よりも低いので、室２０に
空気が溜りやすい。 The suction pressure of the hydraulic pump acts on the chamber 20 inside the filter 2, and since the pressure is lower than atmospheric pressure, air tends to accumulate in the chamber 20.

油圧ポンプが停止すると、フイルタ２の内部の
室２０の圧力が大気圧に戻るので、フロート１２
が浮き上り、弁穴１３が開く。したがつて、フイ
ルタ２の内部の室２０の空気がハウジング１４の
弁穴１３、端板３の穴４を経てフイルタ２の外部
へ流れ、油タンク７の上部空間へ至る。 When the hydraulic pump stops, the pressure in the chamber 20 inside the filter 2 returns to atmospheric pressure, so the float 12
floats up and the valve hole 13 opens. Therefore, the air in the chamber 20 inside the filter 2 flows to the outside of the filter 2 through the valve hole 13 of the housing 14 and the hole 4 of the end plate 3, and reaches the upper space of the oil tank 7.

上述のように、空気逃し弁２１は油圧ポンプの
作動中は油圧ポンプの吸込み圧によりフロート１
２が弁穴１３へ吸い寄せられて弁穴１３を閉じる
ので、油タンクの油がフイルタ２を通らないで室
２０へ流入するのを防止するとともに、油圧ポン
プが停止すると、フロート１２が弁穴１３から離
れて室２０の空気を外部へ逃すように作用する。 As mentioned above, when the hydraulic pump is in operation, the air relief valve 21 closes the float 1 due to the suction pressure of the hydraulic pump.
2 is attracted to the valve hole 13 and closes the valve hole 13, preventing oil in the oil tank from flowing into the chamber 20 without passing through the filter 2. When the hydraulic pump stops, the float 12 closes the valve hole 13. This acts to release the air in the chamber 20 to the outside.

［考案の効果］本考案は上述のように、油タンクの内部に収容
した環状のフイルタの上下端部に端板を結合して
室を区画し、下端板に前記室を油圧ポンプの吸込
口へ連通する出口を設け、上端板に油圧ポンプの
停止時開く空気抜き弁を備え、空気抜き弁は上端
板に設けた空気抜き用の穴を囲むように上端板の
下面に結合したハウジングと、ハウジングの内部
にあつて前記室に作用する吸込み圧により、ハウ
ジングの底壁の弁穴へ係合されるフロートとから
構成しものであり、吸込み圧が作用しない油圧ポ
ンプの停止中に空気抜き弁が開くので、フイルタ
の内部の空気が効果的に外部へ排出されることと
なり、空気の吸い込みによる油圧ポンプの空転や
電動機の加熱を防止できる。[Effects of the invention] As described above, the present invention divides a chamber by connecting end plates to the upper and lower ends of an annular filter housed inside an oil tank, and connects the chamber to the lower end plate as a suction port of a hydraulic pump. The upper end plate is equipped with an air vent valve that opens when the hydraulic pump is stopped. and a float that is engaged with a valve hole in the bottom wall of the housing by the suction pressure acting on the chamber, and the air vent valve opens when the hydraulic pump is stopped when no suction pressure is applied. The air inside the filter is effectively discharged to the outside, and it is possible to prevent the hydraulic pump from idling and the electric motor from heating up due to suction of air.

[Brief explanation of the drawing]

第１図は本考案に係る油タンクの側面断面図で
ある。２……フイルタ、３，１０……端板、４……
穴、１３……弁穴、７……油タンク、７ａ……底
部、８……戻り口、９……出口、１２……フロー
ト、１４……ハウジング、２０……室、２１……
空気抜き弁、２２……リリーフ弁。 FIG. 1 is a side sectional view of an oil tank according to the present invention. 2... Filter, 3, 10... End plate, 4...
Hole, 13... Valve hole, 7... Oil tank, 7a... Bottom, 8... Return port, 9... Outlet, 12... Float, 14... Housing, 20... Chamber, 21...
Air vent valve, 22...Relief valve.

Claims

[Scope of utility model registration request]

End plates are connected to the upper and lower ends of an annular filter housed inside the oil tank to define a chamber, the lower end plate is provided with an outlet that connects the chamber to the suction port of the hydraulic pump, and the upper end plate is provided with an outlet that connects the chamber to the suction port of the hydraulic pump. The air vent valve is equipped with an air vent valve that opens when stopped, and the air vent valve has a housing connected to the lower surface of the upper end plate so as to surround the air vent hole provided in the upper end plate, and a suction pressure that acts on the chamber inside the housing. An oil tank consisting of a float that is engaged with a valve hole in the bottom wall of the oil tank.