JPH0214223B2 - - Google Patents
Info
- Publication number
- JPH0214223B2 JPH0214223B2 JP11173683A JP11173683A JPH0214223B2 JP H0214223 B2 JPH0214223 B2 JP H0214223B2 JP 11173683 A JP11173683 A JP 11173683A JP 11173683 A JP11173683 A JP 11173683A JP H0214223 B2 JPH0214223 B2 JP H0214223B2
- Authority
- JP
- Japan
- Prior art keywords
- valve member
- long groove
- land portion
- sleeve valve
- supply port
- 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.)
- Expired
Links
- 239000012530 fluid Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/08—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by type of steering valve used
- B62D5/083—Rotary valves
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Power Steering Mechanism (AREA)
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、動力舵取装置に用いるロータリバル
ブに関するものである。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a rotary valve used in a power steering device.
〈従来技術〉
一般に動力舵取装置に用いられるロータリバル
ブにおける問題点として、圧力流体のキヤビテー
シヨンによる絞り音（シユー音）の発生がある。
前記絞り音の対策には様々な方法が考えられる
が、その中でも特に有効な方法の１つとして、バ
ルブの円周上に構成されている絞り部の数を増
す、すなわち絞り部１つ当りを通過する流量を小
さくすることがあげられる。ただこのようにバル
ブの円周上の絞り部の数を増加させた場合、各分
割溝の幅またはランドの幅が狭くなるので、必然
的に供給口を小さくせざるを得なく、供給口を小
さくしたことにより供給口を通過する圧力流体の
流速が高くなつて乱流状態となり、供給口から絞
り音を発生するといつた問題を招く。<Prior Art> A problem with rotary valves generally used in power steering devices is the generation of squeezing noise (shu sound) due to cavitation of pressure fluid.
Various methods can be considered to counteract the throttle noise, but one of the most effective methods is to increase the number of throttle parts arranged on the circumference of the bulb, that is, to increase the number of throttle parts per throttle part. One way to do this is to reduce the flow rate. However, when increasing the number of throttle parts on the circumference of the valve in this way, the width of each dividing groove or the width of the land becomes narrower, so the supply port inevitably has to be made smaller. Due to the small size, the flow velocity of the pressure fluid passing through the supply port becomes high, resulting in a turbulent state, which causes problems such as squeezing noise from the supply port.
〈発明の目的〉
上述した問題点を解決すべく本発明の目的とす
るところは、バルブの円周上に構成されている絞
り部の数を増やしても供給口での絞り音の発生を
防止できるように供給口の十分な流路面積を確保
することである。<Object of the Invention> In order to solve the above-mentioned problems, the object of the present invention is to prevent the generation of throttling noise at the supply port even if the number of throttling parts configured on the circumference of the valve is increased. It is important to ensure a sufficient flow path area of the supply port so that
〈発明の構成〉
本発明によるロータリバルブは、スリーブ弁部
材のランド部にランド部の幅より小さい長溝を軸
方向に形成し、外周に前記長溝と連通する長溝の
幅より径の大きい流通穴を形成したことを特徴と
するものである。<Configuration of the Invention> In the rotary valve according to the present invention, a long groove smaller than the width of the land portion is formed in the land portion of the sleeve valve member in the axial direction, and a communication hole communicating with the long groove and having a diameter larger than the width of the long groove is formed on the outer periphery. It is characterized by the fact that it has been formed.
〈実施例〉
以下本発明の実施例を図面に基づいて説明す
る。第１図は本発明のロータリバルブをラツクア
ンドピニオン形の動力舵取装置に適用した例を示
し、図中１０は動力舵取装置の本体をなすギヤハ
ウジングを示し、このギヤハウジング１０にはピ
ニオン軸１１が両端をそれぞれ軸受１２，１３に
よつて回転可能に軸承され、これと交差する方向
に摺動可能なラツク軸１４のラツク歯１５と噛合
している。このラツク軸１４の両端は所要の操縦
リンク機構を介して操向車輪に連結され、またラ
ツク軸１４にはパワーシリンダ１６のピストン１
７（第３図参照）が作動的に連結されている。<Example> Hereinafter, an example of the present invention will be described based on the drawings. FIG. 1 shows an example in which the rotary valve of the present invention is applied to a rack-and-pinion type power steering device. In the figure, 10 indicates a gear housing forming the main body of the power steering device. A shaft 11 is rotatably supported at both ends by bearings 12 and 13, respectively, and meshes with rack teeth 15 of a rack shaft 14 that is slidable in a direction intersecting the shaft. Both ends of the rack shaft 14 are connected to steering wheels via a required steering linkage, and the rack shaft 14 is connected to the piston 1 of the power cylinder 16.
7 (see FIG. 3) are operatively connected.
前記ギヤハウジング１０には弁ハウジング１８
が固定され、この弁ハウジング１８の弁孔１９に
本発明のロータリバルブが収納されている。この
ロータリバルブは前記ピニオン軸１１の軸線を中
心として相対回転可能なスリーブ弁部材２１なら
びにロータ弁部材２２より構成され、このスリー
ブ弁部材２１は連結ピン２３によつて前記ピニオ
ン軸１１に連結され、またロータ弁部材２２は操
向ハンドルに連結される操舵軸２４に一体的に形
成され、この操舵軸２４は前記ピニオン軸１１に
トーシヨンバー２５を介して可撓的に連結されて
いる。 The gear housing 10 includes a valve housing 18.
is fixed, and the rotary valve of the present invention is accommodated in the valve hole 19 of this valve housing 18. This rotary valve is composed of a sleeve valve member 21 and a rotor valve member 22 that are relatively rotatable about the axis of the pinion shaft 11, and the sleeve valve member 21 is connected to the pinion shaft 11 by a connecting pin 23, Further, the rotor valve member 22 is integrally formed with a steering shaft 24 connected to a steering handle, and this steering shaft 24 is flexibly connected to the pinion shaft 11 via a torsion bar 25.
前記スリーブ弁部材２１の内周には第３図に示
すように、複数の凹溝２７が円周上等角度間隔に
形成され、これら凹溝２７の各間にランド部２８
が形成されている。ランド部２８の１つとびには
第２図、第３図、第４図に示すように軸線方向に
ランド部２８より幅の小さい長溝２９ａが形成さ
れ、スリーブ弁部材２１の外周より長溝２９ａに
連通する長溝２９ａの幅より径の大きい流通孔２
９ｂが形成され、長溝２９ａと流通穴２９ｂによ
つて流路面積の大きい供給口２９が得られる。こ
れら供給口２９は供給ポンプに通ずる供給ポート
３０に連通されている。供給口２９が開口された
ランド部２８（以下これを第１のランド部と称
し、残りを第２のランド部と称す）の両横に連接
された凹溝２７，２７には一対の分配孔３１，３
２が開口され、これら一対の分配孔３１，３２は
前記パワーシリンダ１６の左右室１６ａ，１６ｂ
に通ずる給排ポート３３，３４にそれぞれ連通さ
れている。 As shown in FIG. 3, a plurality of grooves 27 are formed on the inner periphery of the sleeve valve member 21 at equal angular intervals on the circumference, and a land portion 28 is formed between each groove 27.
is formed. As shown in FIGS. 2, 3, and 4, each of the land portions 28 is formed with a long groove 29a having a width smaller than that of the land portion 28 in the axial direction. The communication hole 2 has a diameter larger than the width of the communicating long groove 29a.
9b is formed, and the supply port 29 with a large flow path area is obtained by the long groove 29a and the communication hole 29b. These supply ports 29 communicate with a supply port 30 which leads to a supply pump. A pair of distribution holes are provided in concave grooves 27, 27 connected on both sides of the land portion 28 (hereinafter referred to as the first land portion and the rest as the second land portion) in which the supply port 29 is opened. 31,3
2 are opened, and these pair of distribution holes 31, 32 are connected to the left and right chambers 16a, 16b of the power cylinder 16.
They are communicated with supply/discharge ports 33 and 34, respectively.
またロータ弁部材２２の外周には前記スリーブ
弁部材２１の各凹溝２７にそれぞれ対応する複数
のランド部３５が円周上等角度間隔に形成され、
これらランド部３５の各間に凹溝３６が形成され
ている。各凹溝２６のうち前記第２のランド部２
８に対応する１つとびの凹溝３６には前記一対の
分配孔３１，３２の両側に位置して排出孔３７が
開口され、これら排出孔３７はロータ弁部材２２
とトーシヨンバー２５との間に形成された通路３
９、貫通孔４０および排出ポート４１を介してリ
ザーバに連通されている。 Further, on the outer periphery of the rotor valve member 22, a plurality of land portions 35 corresponding to the respective grooves 27 of the sleeve valve member 21 are formed at equal angular intervals on the circumference,
A groove 36 is formed between each of these land portions 35 . The second land portion 2 of each groove 26
Discharge holes 37 are opened in each groove 36 corresponding to the rotor valve member 22 and located on both sides of the pair of distribution holes 31 and 32.
A passage 3 formed between the torsion bar 25 and the torsion bar 25
9, communicates with the reservoir via a through hole 40 and a discharge port 41.
次に上述した構成における動作について説明す
る。今、操舵軸２４に例えば第３図の時計まわり
の操舵トルクが加えられ、トーシヨンバー２５が
捩られてロータ弁部材２２がスリーブ弁部材２１
に対して相対回転すると、供給口２９と一方の分
配孔３２との間の絞り部５０の開口面積が増大
し、供給孔２９と他方の分配孔３１との間の絞り
部５１の開口面積が減少する。絞り部５０の開口
面積が絞り部５１の開口面積より大きい場合は、
供給口２９から流入した圧力流体は、絞り部５
０、分配孔３２を経てパワーシリンダ１６の右室
１６ｂに流入し、ラツク軸１４を左進させ、パワ
ーシリンダ１６の左室１６ａの圧力流体は分配孔
３１、排出孔３７を介して流出する。 Next, the operation in the above-described configuration will be explained. Now, for example, a clockwise steering torque as shown in FIG. 3 is applied to the steering shaft 24, and the torsion bar 25 is twisted so that the rotor valve member 22
, the opening area of the throttle part 50 between the supply port 29 and one distribution hole 32 increases, and the opening area of the throttle part 51 between the supply hole 29 and the other distribution hole 31 increases. Decrease. If the aperture area of the aperture section 50 is larger than the aperture area of the aperture section 51,
The pressure fluid flowing in from the supply port 29 flows through the constriction part 5
0, it flows into the right chamber 16b of the power cylinder 16 through the distribution hole 32, moves the rack shaft 14 to the left, and the pressure fluid in the left chamber 16a of the power cylinder 16 flows out through the distribution hole 31 and the discharge hole 37.
上記の動作により供給口２９においては、第３
図に示すように圧力流体が流通孔２９ｂ、長溝２
９ａを流れるが、流路面積を十分に確保したこと
により流速が高くならず、圧力流体の乱流が生じ
ることはなく、キヤビテーシヨンの発生を防止で
きる。 Due to the above operation, the third
As shown in the figure, pressure fluid flows through the circulation hole 29b and the long groove 2.
9a, but by ensuring a sufficient flow path area, the flow velocity does not become high, turbulent flow of the pressure fluid does not occur, and cavitation can be prevented from occurring.
上述した実施例は、ランド部に供給口を形成し
たロータリバルブについて説明したが、ランド部
に分配孔を形成したロータリバルブにおいて分配
孔にも同様に適用できる。 Although the above-mentioned embodiment has been described with respect to a rotary valve in which a supply port is formed in a land portion, the present invention can be similarly applied to a distribution hole in a rotary valve in which a distribution hole is formed in a land portion.
〈発明の効果〉
以上述べたように本発明においては、スリーブ
弁部材のランド部にランド部の幅より小さい長溝
を軸方向に形成し、外周に前記長溝と連通する長
溝の幅より径の大きい流通孔を形成したので、供
給口の十分な流路面積を確保でき、絞り部の数を
増やしたものでもキヤビテーシヨンの発生に起因
する絞り音の発生を防止できる利点がある。<Effects of the Invention> As described above, in the present invention, a long groove smaller than the width of the land portion is formed in the land portion of the sleeve valve member in the axial direction, and a long groove having a diameter larger than the width of the long groove communicating with the long groove is formed on the outer periphery. Since the flow holes are formed, a sufficient flow path area of the supply port can be ensured, and there is an advantage that squeezing noise caused by cavitation can be prevented even when the number of throttle parts is increased.
図面は本発明の実施例を示すもので、第１図は
本発明の実施例を示すロータリバルブを備えた動
力舵取装置の断面図、第２図は本発明の要部を示
す断面図、第３図は第１図における−線で断
面し拡大した図、第４図は第３図における方向
から見た図。
２１…スリーブ弁部材、２２…ロータ弁部材、
２７，３６…凹溝、２８，３５…ランド部、２９
…供給口、２９ａ…長溝、２９ｂ…流通穴、３
１，３２…分配孔、３７…排出孔。
The drawings show embodiments of the present invention; FIG. 1 is a cross-sectional view of a power steering device equipped with a rotary valve showing an embodiment of the present invention; FIG. 2 is a cross-sectional view showing essential parts of the present invention; FIG. 3 is an enlarged cross-sectional view taken along the - line in FIG. 1, and FIG. 4 is a view seen from the direction in FIG. 3. 21... Sleeve valve member, 22... Rotor valve member,
27, 36... Concave groove, 28, 35... Land portion, 29
... Supply port, 29a... Long groove, 29b... Distribution hole, 3
1, 32...Distribution hole, 37...Discharge hole.
Claims (1)
にロータ弁部材を備え、このスリーブ弁部材の内
周ならびにロータ弁部材の外周にそれぞれランド
部と凹溝を円周方向に交互に形成し、前記スリー
ブ弁部材に対してロータ弁部材を相対回転させる
ことにより前記各ランド部間に形成された絞り部
を開閉させて供給口より分配口へ供給される圧力
流体を制御するロータリバルブにおいて、前記ス
リーブ弁部材のランド部にランド部の幅より小さ
い長溝を軸方向に形成し、スリーブ弁部材の外周
に前記長溝と連通する長溝の幅より径の大きい流
通穴を形成したことを特徴とするロータリバル
ブ。1 A sleeve valve member and a rotor valve member that are rotatable relative to each other are provided, and lands and grooves are alternately formed in the circumferential direction on the inner circumference of the sleeve valve member and the outer circumference of the rotor valve member, respectively, and the sleeve valve member In a rotary valve that controls the pressure fluid supplied from the supply port to the distribution port by opening and closing a constriction portion formed between the land portions by rotating the rotor valve member relative to the sleeve valve member. A rotary valve characterized in that a long groove smaller in width than the land portion is formed in the land portion in the axial direction, and a communication hole communicating with the long groove and having a diameter larger than the width of the long groove is formed in the outer periphery of the sleeve valve member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11173683A JPS604465A (en) | 1983-06-21 | 1983-06-21 | Rotary valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11173683A JPS604465A (en) | 1983-06-21 | 1983-06-21 | Rotary valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS604465A JPS604465A (en) | 1985-01-10 |
| JPH0214223B2 true JPH0214223B2 (en) | 1990-04-06 |
Family
ID=14568877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11173683A Granted JPS604465A (en) | 1983-06-21 | 1983-06-21 | Rotary valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS604465A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0438881U (en) * | 1990-07-30 | 1992-04-02 |
-
1983
- 1983-06-21 JP JP11173683A patent/JPS604465A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS604465A (en) | 1985-01-10 |
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