JPH02209681A - Hydraulic control valve - Google Patents
Hydraulic control valveInfo
- Publication number
- JPH02209681A JPH02209681A JP2611489A JP2611489A JPH02209681A JP H02209681 A JPH02209681 A JP H02209681A JP 2611489 A JP2611489 A JP 2611489A JP 2611489 A JP2611489 A JP 2611489A JP H02209681 A JPH02209681 A JP H02209681A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- hydraulic
- pressure
- port
- friction brake
- 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.)
- Granted
Links
- 239000011148 porous material Substances 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Landscapes
- Safety Valves (AREA)
- Details Of Valves (AREA)
Abstract
Description
【発明の詳細な説明】 産業上の利用分野 この発明は手動操作の油圧制御弁に関する。[Detailed description of the invention] Industrial applications This invention relates to manually operated hydraulic control valves.
従来の技術
手動操作の油圧制御弁は、バルブ本体のポンプポート側
とタンクポート側との間に、このポンプポート側からタ
ンクポート側への油圧弁口を開閉する開閉弁が設けられ
ており１手動操作によってブツシュピンを介して開閉弁
を開閉してポンプポート側の圧力を高低に切替える構成
としている。Conventional technology Manually operated hydraulic control valves are provided with an on-off valve between the pump port side and the tank port side of the valve body to open and close the hydraulic valve port from the pump port side to the tank port side. The configuration is such that the pressure on the pump port side is switched between high and low levels by manually opening and closing the on-off valve via a bushing pin.
発明が解決しようとする課題
この油圧制御弁を、手動操作によって連動機構を介して
摩擦ブレーキの制動を行う構成とすると、手動操作によ
ってブツシュピンを介して開閉弁によって油圧弁口を順
次閉じてゆくとポンプポート側の油圧が順次上昇し、摩
擦ブレーキの制動力が順次増大するが、このブツシュピ
ンを一度に押し込んで開閉弁が油圧弁口を完全に閉じて
しまうと、ポンプボー、ト側からタンクポート側への圧
油が遮断されるから、ポンプポート側の圧力がこの回路
に設けられる別のメインリリーフバルブの設定圧力迄上
昇する。Problems to be Solved by the Invention If this hydraulic control valve is configured to brake the friction brake through an interlocking mechanism by manual operation, if the hydraulic valve port is sequentially closed by the opening/closing valve via the bushing pin by manual operation. The hydraulic pressure on the pump port side increases gradually, and the braking force of the friction brake increases sequentially, but if this push pin is pushed in at once and the opening/closing valve completely closes the hydraulic valve port, the pressure will increase from the pump port side to the tank port side. Since the pressure oil to the pump is cut off, the pressure on the pump port side increases to the set pressure of another main relief valve provided in this circuit.
このため、摩擦ブレーキを作動する連動機構や摩擦ブレ
ーキの破損を来す恐れがあった。Therefore, there was a risk that the interlocking mechanism for operating the friction brake and the friction brake would be damaged.
そこでこの発明は、上記のような課題を防止するため、
ポンプポート側からタンクポート側への圧油が遮断され
たときには、ポンプポート側の油圧がメインリリーフバ
ルブの設定圧力迄上昇しないような油圧制御弁を提供し
ようとするものである。Therefore, in order to prevent the above-mentioned problems, this invention
The present invention aims to provide a hydraulic control valve that prevents the hydraulic pressure on the pump port side from rising to the set pressure of the main relief valve when pressure oil from the pump port side to the tank port side is cut off.
課題を解決するための手段
この発明は、バルブ本体（１）のポンプポート（２）側
とタンクポート（３）側との間に、このポンプポート（
２）側からタンクポート（３）側への油圧弁口（４）を
開閉する開閉弁（５）と、該両ポート（２） （３１間
を連通ずるこの油圧弁口（４）の開閉とは別の細孔（６
）を設けたことを特徴とする油圧制御弁の構成とする。Means for Solving the Problems The present invention provides a pump port (2) between the pump port (2) side and the tank port (3) side of the valve body (1).
An on-off valve (5) that opens and closes the hydraulic valve port (4) from the 2) side to the tank port (3) side, and an on-off valve (5) that opens and closes the hydraulic valve port (4) that communicates between both ports (2) (31). is another pore (6
) is provided.
発明の作用
バルブ本体（１）のポンプポート（２）側からタンクポ
ート（３）側への油圧弁口（４）の開閉弁（５）を開く
と、ポンプポート（２）側からの圧油はタンクポート（
３）側へ流れる。Operation of the invention When the on-off valve (5) of the hydraulic valve port (4) from the pump port (2) side of the valve body (1) to the tank port (3) side is opened, pressure oil flows from the pump port (2) side. is the tank port (
3) Flows to the side.
この開閉弁（５）によって油圧弁口（４）を閉じると、
ポンプポート（２）側からタンクポート（３）側への圧
油が遮断されると共に、この油圧弁口（４１の開閉とは
別の細孔（６）を通ってポンプポート（２）側の圧油の
一部はタンクポート（３）側へ流れる。When the hydraulic valve port (4) is closed by this on-off valve (5),
Pressure oil is cut off from the pump port (2) side to the tank port (3) side, and the pressure oil flows through the small hole (6) that is different from the opening/closing of this hydraulic valve port (41) to the pump port (2) side. A part of the pressure oil flows to the tank port (3) side.
発明の効果
このように、開閉弁（５）によって油圧弁口（４）が閉
じられたとき、ポンプポート（２）側の圧油の一部は細
孔（６）を通ってタンクポート（３）側へ流れるから、
このポンプポート（２）側の油路には、この細孔（６）
による差圧分のみ油圧が上昇する。Effects of the Invention As described above, when the hydraulic valve port (4) is closed by the on-off valve (5), a part of the pressure oil on the pump port (2) side passes through the pore (6) and reaches the tank port (3). ) side,
The oil passage on this pump port (2) side has this small hole (6).
The oil pressure increases by the differential pressure caused by
従って１回路中のメインリリーフバルブの設定圧迄該ポ
ンプポート（２１側の油圧が上昇しないから、この細孔
（６）による差圧分を所定圧力とすることができ、必要
以上の圧力が立たないようにすることができる。Therefore, since the oil pressure at the pump port (21 side) does not rise up to the set pressure of the main relief valve in one circuit, the pressure difference due to this pore (6) can be set to the specified pressure, and no more pressure than necessary is built up. You can avoid it.
この油圧制御弁を用いて摩擦ブレーキ等を作動させる場
合において、該摩擦ブレーキ等を作動するための必要以
上の圧力が立たないようにすることができるから、摩擦
ブレーキの作動圧力や連動機構の強度をこの必要圧力に
対して設定すればよく、破損防止を図ることができる。When operating a friction brake, etc. using this hydraulic control valve, it is possible to prevent pressure from building up more than necessary to operate the friction brake, etc., so the operating pressure of the friction brake and the strength of the interlocking mechanism can be reduced. can be set to this required pressure, and damage can be prevented.
実施例
なお、回倒において左右の走行装置を制動する摩擦ブレ
ーキ（７）を作動させるブレーキシリンダ（８）へ油圧
ポンプ（９）から圧油を供給する油路（１ωを設け、こ
れら左右のブレーキシリンダ（８）のピストンが突出し
て走行装置へ伝動のクラッチを切りとしだ位置において
、左右のブレーキシリンダ（８）を連通して油タンク内
へ排油する戻り油路００を設けている。Embodiment In addition, an oil passage (1ω) is provided to supply pressure oil from a hydraulic pump (9) to a brake cylinder (8) that operates a friction brake (7) that brakes the left and right traveling devices when the vehicle is turned. At a position where the piston of the cylinder (8) protrudes to disengage the clutch for transmitting power to the traveling device, a return oil passage 00 is provided which communicates the left and right brake cylinders (8) and drains oil into the oil tank.
該左右のブレーキシリンダ（８）への油路（１［Ｉには
作業装置（ｌのを昇降する昇降シリンダ（１３の切替弁
（１４１と、又、走行装置へ伝動のクラッチを切り作動
する電磁弁（１９とを設けている。（１ｅはメインリリ
ーフバルブである。The oil passage (1) to the left and right brake cylinders (8) includes a lifting cylinder (13) that lifts and lowers the working device (l), and an electromagnetic valve (141) that disconnects and operates the transmission clutch to the traveling device. A valve (19) is provided (1e is a main relief valve).
該戻り油路（■１）には、手動操作によってこの戻り油
路（１））内の油圧を順次増大して摩擦ブレーキ（７）
を作動させる油圧制御弁（１ηを設けている。A friction brake (7) is installed in the return oil passage (■1) by sequentially increasing the hydraulic pressure in the return oil passage (1) by manual operation.
A hydraulic control valve (1η) is provided to operate the
油圧制御弁（１ηは、バルブ本体（１）にポンプポート
（２）とタンクポート（３）を設けている。これらポン
プポート（２）側とタンクポート（３）側との間には、
このポンプポート（２）側からタンクポート（３）側へ
の油路ｉ１）１）９１を設けている。The hydraulic control valve (1η) is provided with a pump port (2) and a tank port (3) in the valve body (1). Between these pump port (2) side and tank port (3) side,
An oil path i1)1) 91 is provided from the pump port (2) side to the tank port (3) side.
油路Ｔｌ１ｌには油圧弁口（４）が形成され、この油圧
弁口（４）を開閉する開閉弁（５）を設けている。該開
閉弁〈５）を開閉作動するブツシュピン１２１ｍを摺動
自在に設け、このブツシュピン＋２［）と開閉弁（５）
との間にスプリングシ１）を設けている。A hydraulic valve port (4) is formed in the oil passage Tl1l, and an on-off valve (5) for opening and closing the hydraulic valve port (4) is provided. A bushing pin 121m that opens and closes the on-off valve (5) is slidably provided, and this bushing pin +2 [) and the on-off valve (5)
A spring 1) is provided between the two.
該開閉弁（５）と一体で油路（１）内を摺動するピスト
ンＬ２♂を設けている。該ピストンＱδには、この軸方
向に縦油孔（２）を設けると共に、この縦油孔（７３と
直交する方向に横油孔Ｑ４１を上下に各々設けている。A piston L2♂ is provided which slides in the oil passage (1) integrally with the on-off valve (5). The piston Qδ is provided with a vertical oil hole (2) in the axial direction, and horizontal oil holes Q41 are provided above and below in a direction perpendicular to the vertical oil hole (73).
該開閉弁（５）が油圧弁口（４）を閉とした位置におい
て、下側の横油孔Ｑ４と連通する細孔（６）を該油路（
１８を介してポンプポート（２）側とタンクポート（３
）側との間を連通して設けている。In the position where the on-off valve (5) closes the hydraulic valve port (4), the oil passage (
18 to the pump port (2) side and tank port (3)
) side are connected to each other.
油圧ポンプ（９）を回転し、電磁弁（囚を電磁的に切替
えるとブレーキシリンダ（８）へ送油され、ピストンは
クラッチ切り位置迄伸長して圧油は戻り油路（１））を
通り、油圧制御弁（１７１のポンプポート（２）側から
ピストン［２ａの縦油孔（２）を通ってスプリング＋２
１）に抗して開閉弁（５）を押し上げ、上側の油路２４
１から油路（１〕を通ってタンクポート（３）から排油
される。When the hydraulic pump (9) is rotated and the solenoid valve is switched electromagnetically, oil is sent to the brake cylinder (8), the piston extends to the clutch disengaged position, and the pressure oil returns through the oil passage (1). , from the pump port (2) side of the hydraulic control valve (171) to the spring +2 through the vertical oil hole (2) of the piston [2a]
1), push up the on-off valve (5) and open the upper oil passage 24.
1, the oil is drained from the tank port (3) through the oil passage (1).
油圧制御弁（１カのブツシュピンＣＩを手動操作によっ
て押し下げてゆくと、油圧弁口（４）が開閉弁（５）に
よって順次閉じられ、戻り油路（１）１内の油圧が順次
上昇してブレーキシリンダ（８）のピストンが伸長し。When the hydraulic control valve (one button CI) is manually pushed down, the hydraulic valve ports (4) are sequentially closed by the on-off valve (5), and the hydraulic pressure in the return oil path (1) 1 increases sequentially. The piston of the brake cylinder (8) extends.
摩擦ブレーキ（７）の制動力が次第に強くなって走行装
置が制動される。The braking force of the friction brake (7) gradually increases to brake the traveling device.
このブツシュビン四を一杯押し下げて開閉弁（５）が油
圧弁口（４）を閉じてしまうと、このピストン（冷の下
側の横油孔シ４が細孔（６）と連通ずるから、圧油の一
部はこの細孔（６）からタンクボート（３）側へ排油さ
れて、戻り油路０１３内の油圧はこの細孔（６）による
差圧分のみ上昇して、メインリリーフ＋１６）の設定圧
迄上昇しない。When this bushing pin 4 is pushed down fully and the on-off valve (5) closes the hydraulic valve port (4), this piston (the cold lower side oil hole 4 communicates with the small hole (6), so the pressure A part of the oil is drained from this pore (6) to the tank boat (3) side, and the oil pressure in the return oil passage 013 increases by the pressure difference due to this pore (6), resulting in a main relief +16 ) does not rise to the set pressure.
このように、ポンプポート（２）側とタンクボート（３
）側との間を連通ずる油圧弁口（４）の開閉とは別の細
孔（６）を設けたから、油圧弁口（４）を開閉弁（５）
で閉じたとき、圧油はその一部が該細孔（６）から逃げ
てメインリリーフバルブ（１６１の設定圧力迄上昇しな
い。In this way, the pump port (2) side and the tank boat (3)
) side is provided, which is separate from the opening and closing of the hydraulic valve port (4), so the hydraulic valve port (4) can be opened and closed by the opening/closing valve (5).
When the main relief valve (161) is closed, part of the pressure oil escapes from the pore (6) and does not rise to the set pressure of the main relief valve (161).
従ってこの細孔（６）の大きさによって摩擦ブレーキ（
７）を作動する上限圧力に油圧を設定することができ、
該摩擦ブレーキ（７〕やこの連動機構の破損防止を図る
ことができる。Therefore, depending on the size of this pore (6), the friction brake (
7) The oil pressure can be set to the upper limit pressure to operate,
Damage to the friction brake (7) and its interlocking mechanism can be prevented.
図は、この発明の一実施例を示すもので、第１図は油圧
制御弁の断面図、第２図は油圧回路図である。
図中、符号（１）はバルブ本体、（２）はポンプポート
、（３）はタンクボート、（４）は油圧弁口、（５）は
開閉弁、（６１は細孔を示す。The figures show one embodiment of the present invention, in which FIG. 1 is a sectional view of a hydraulic control valve, and FIG. 2 is a hydraulic circuit diagram. In the figure, (1) is the valve body, (2) is the pump port, (3) is the tank boat, (4) is the hydraulic valve port, (5) is the on-off valve, and (61 is the pore).
Claims (1)
ート（３）側との間に，このポンプポート（２）側から
タンクポート（３）側への油圧弁口（４）を開閉する開
閉弁（５）と、該両ポート（２）（３）間を連通するこ
の油圧弁口（４）の開閉とは別の細孔（６）を設けたこ
とを特徴とする油圧制御弁。A hydraulic valve port (4) between the pump port (2) side and the tank port (3) side of the valve body (1) opens and closes the hydraulic valve port (4) from the pump port (2) side to the tank port (3) side. A hydraulic control valve characterized in that a valve (5) and a pore (6) which communicates between the ports (2) and (3) and which are separate from the opening and closing of the hydraulic valve port (4) are provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1026114A JP2817163B2 (en) | 1989-02-03 | 1989-02-03 | Hydraulic control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1026114A JP2817163B2 (en) | 1989-02-03 | 1989-02-03 | Hydraulic control valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02209681A true JPH02209681A (en) | 1990-08-21 |
| JP2817163B2 JP2817163B2 (en) | 1998-10-27 |
Family
ID=12184556
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1026114A Expired - Fee Related JP2817163B2 (en) | 1989-02-03 | 1989-02-03 | Hydraulic control valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2817163B2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61186805U (en) * | 1985-05-14 | 1986-11-21 | ||
| JPH0224105U (en) * | 1988-08-04 | 1990-02-16 |
-
1989
- 1989-02-03 JP JP1026114A patent/JP2817163B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61186805U (en) * | 1985-05-14 | 1986-11-21 | ||
| JPH0224105U (en) * | 1988-08-04 | 1990-02-16 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2817163B2 (en) | 1998-10-27 |
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