JPH078349Y2 - Hydraulic reaction force device of power steering device - Google Patents

Hydraulic reaction force device of power steering device

Info

Publication number
JPH078349Y2
JPH078349Y2 JP13999587U JP13999587U JPH078349Y2 JP H078349 Y2 JPH078349 Y2 JP H078349Y2 JP 13999587 U JP13999587 U JP 13999587U JP 13999587 U JP13999587 U JP 13999587U JP H078349 Y2 JPH078349 Y2 JP H078349Y2
Authority
JP
Japan
Prior art keywords
reaction force
hydraulic
shaft
steering
balls
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 - Lifetime
Application number
JP13999587U
Other languages
Japanese (ja)
Other versions
JPS6444878U (en
Inventor
靖芳 江森
弘志 大崎
Original Assignee
自動車機器株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 自動車機器株式会社 filed Critical 自動車機器株式会社
Priority to JP13999587U priority Critical patent/JPH078349Y2/en
Priority to US07/231,808 priority patent/US4877100A/en
Publication of JPS6444878U publication Critical patent/JPS6444878U/ja
Application granted granted Critical
Publication of JPH078349Y2 publication Critical patent/JPH078349Y2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Description

【考案の詳細な説明】 〔産業上の利用分野〕 本考案は、動力舵取装置において車輌の走行速度や操舵
角度等といった車輌の各種の走行条件に応じた適切な操
舵力を得るための油圧反力装置の改良に関する。
[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a hydraulic power steering system for obtaining an appropriate steering force according to various traveling conditions of a vehicle such as a traveling speed and a steering angle of the vehicle. Regarding improvement of reaction device.

〔従来の技術〕[Conventional technology]

自動車のハンドル操作力(操舵力)を軽減するための動
力舵取装置において、運転者の操舵操作に応じた操舵力
や操舵角度、さらには車速などを始めとする車輌の各種
走行条件により装置動作を適切に制御することが必要と
されている。すなわち、車輌停車中の据切り時や低速走
行中の操舵時には、大きな操舵補助力を出力し、きわめ
て軽い操舵操作を可能とする一方、車輌の高速走行中に
大きな操舵補助力を生じさせると操舵力が軽くなりす
ぎ、運転者に不安感を与える等の問題を招き、運転感覚
の適正化を図るうえで好ましくなく、充分な手応え感の
ある操舵操作を行なえるように操舵補助力を小さくして
操舵力を増大させ、舵取ハンドルにある程度の重さをも
たせ、直進時の安定性等を確保することが必要とされ
る。そして、このような操舵力制御は、操舵角度が大き
くなるにしたがっても同様に必要とされている。
A power steering device for reducing the steering operation force (steering force) of an automobile. The operation of the device depends on the steering force and the steering angle according to the steering operation of the driver, and various traveling conditions of the vehicle such as the vehicle speed. Need to be properly controlled. That is, when the vehicle is stationary or steering during low speed traveling, a large steering assist force is output to enable an extremely light steering operation, while steering is performed when a large steering assist force is generated during high speed traveling of the vehicle. The force becomes too light, causing problems such as making the driver feel uneasy, which is not preferable for optimizing the driving sensation, and the steering assist force is reduced so that the steering operation can be performed with a sufficient response. Therefore, it is necessary to increase the steering force, give the steering wheel a certain amount of weight, and ensure the stability when going straight. Further, such steering force control is also required as the steering angle increases.

このような要請に応えるものとして、上述した車輌の各
種走行条件に応じて制御される反力油圧により舵取ハン
ドルに適当な剛性(操舵反力)を与えることで、車輌の
高、低速走行中等における操舵力を制御し得るようにし
てなる油圧反力装置が知られており、従来から種々の構
成を有するものが多数提案されている。すなわち、この
種の油圧反力装置として最も一般には、たとえば特開昭
49-102092号公報等に示されるように、流路切換え用の
回転式制御弁において入力軸側に反力アームを突設する
とともに、このアームの回転方向両側から進退動作する
ようにして出力軸側に一対の反力プランジャを設け、か
つこれらプランジャの外方端側に油圧反力室を形成して
なる構成のものが知られている。そして、この油圧反力
室内に車輌の走行速度等に応じて反力油圧を適宜供給す
ることでプランジャを駆動させ、アームを介して入力軸
に所要の拘束力を作用させることにより、適切な操舵反
力を得て車輌の走行条件に適合する操舵操作を可能とす
るものであった。
In order to meet such demands, by providing appropriate rigidity (steering reaction force) to the steering wheel by reaction force hydraulic pressure controlled according to various traveling conditions of the vehicle described above, the vehicle is traveling at high or low speeds. 2. Description of the Related Art A hydraulic reaction force device capable of controlling a steering force in is known, and many types having various configurations have been conventionally proposed. That is, the most common hydraulic reaction device of this type is disclosed in
As shown in Japanese Patent Publication No. 49-102092, in a rotary control valve for switching a flow path, a reaction force arm is provided so as to project on the input shaft side, and the output shaft is made to move forward and backward from both sides in the rotation direction of this arm. A configuration is known in which a pair of reaction force plungers are provided on the side and a hydraulic reaction force chamber is formed on the outer end side of these plungers. Then, the plunger is driven by appropriately supplying reaction force hydraulic pressure according to the traveling speed of the vehicle into the hydraulic reaction force chamber, and the required restraining force is applied to the input shaft via the arm, so that appropriate steering is performed. It was possible to obtain a reaction force and perform a steering operation that matches the running conditions of the vehicle.

〔考案が解決しようとする問題点〕[Problems to be solved by the invention]

しかしながら、上述した従来構造では、出力軸内で軸線
から離れた部分に反力プランジャを配設しなければなら
ず、このため反力装置配設部分の径方向への大型化を避
けられないもので、これはたとえばプランジャの受圧面
積等を拡大して油圧反力容量を大きくしようとする場合
に著しいものであった。そして一方において、この種の
反力装置が付設される動力舵取装置は、自動車のエンジ
ンルーム下側等のスペース的に制約の大きい場所に配設
されるもので、その小型かつコンパクト化は満足しなけ
ればならない条件の一つである。
However, in the above-described conventional structure, the reaction force plunger has to be arranged in a portion apart from the axis line in the output shaft, and therefore, the reaction force device disposition portion inevitably increases in size in the radial direction. This is remarkable when, for example, the pressure receiving area of the plunger is expanded to increase the hydraulic reaction force capacity. On the other hand, the power steering device provided with this type of reaction force device is arranged in a space-constrained place such as the lower side of the engine room of an automobile, and its compactness and compactness are satisfactory. This is one of the conditions that must be met.

また、このような小型化等の要請を満足し得るものとし
て、たとえば特公昭54-9368号公報等に示されるよう
に、反力プランジャやボール等の係合子を出力軸側に求
心方向に可動可能に保持しその外方端側から油圧反力を
作用させることで、この係合子を入力軸側に形成した係
合凹部に係合させることで拘束力を作用させるようにし
た構成を有する装置も知られている。
In order to satisfy such demands for downsizing, for example, as shown in Japanese Patent Publication No. 54-9368, a reaction force plunger, a ball or other engaging member is movable in the centripetal direction toward the output shaft side. A device having a structure in which the engaging element is engaged with an engaging concave portion formed on the input shaft side so that a restraining force is exerted by holding the operability of the engaging element and applying a hydraulic reaction force from the outer end side thereof. Is also known.

しかし、このような従来構造において、係合子がプラン
ジャである場合には、このプランジャ先端と前記係合凹
部との間がすべり接触となり、油圧反力を作用させたと
きに両者間で摺動抵抗が大きく、摩擦力が増大して装置
作動にあたっての安定性等を確保し得ない等の問題を招
いてしまうものであった。また、このプランジャの受圧
面積を大きくするとこの反力装置配設部分が径方向に大
きくなり、小型化を達成し得ないばかりでなく、プラン
ジャ径が太くなり、そのガイド長さが不足し安定した作
動状態を得ることが困難となるといった問題があった。
However, in such a conventional structure, when the engaging element is a plunger, a sliding contact occurs between the plunger tip and the engaging concave portion, and when a hydraulic reaction force is applied, a sliding resistance is generated between them. However, the frictional force is increased, and the stability and the like cannot be ensured when the apparatus is operated. Further, when the pressure receiving area of this plunger is increased, the reaction force device disposition portion becomes large in the radial direction, and not only downsizing cannot be achieved, but also the plunger diameter becomes thicker and the guide length becomes insufficient and stable. There is a problem that it is difficult to obtain the operating state.

一方、上述した係合子としてボールを用いた場合には、
このボールとそのガイド孔との間の油密性を充分に確保
することが困難で反力油圧の洩れ量が大きくしかもその
受圧面積も小さい等の理由から、有効な油圧反力を生じ
させるためには大流量の油圧源が必要となる等の問題点
をもち、実現性の乏しいもので、これらの問題点を一掃
し上述した装置全体の小型かつコンパクト化や動作性能
の安定化等を満足し得る油圧反力装置の出現が望まれて
いる。
On the other hand, when a ball is used as the above-mentioned engaging element,
In order to generate an effective hydraulic reaction force because it is difficult to ensure sufficient oil tightness between the ball and its guide hole, the amount of leakage of reaction force hydraulic pressure is large, and the pressure receiving area is small. Has a problem such as the need for a large flow hydraulic power source, which is not very feasible, and these problems are eliminated to satisfy the above-mentioned miniaturization of the entire device and stabilization of operation performance. The advent of a possible hydraulic reaction device is desired.

〔問題点を解決するための手段〕[Means for solving problems]

上述した要請に応えるために本考案に係る動力舵取装置
の油圧反力装置は、入、出力軸の一方軸側に設けたフラ
ンジ部に等配して貫通形成された三個のガイド孔内で軸
線方向に摺動自在に保持されている三個のボールと、こ
れら各ボールが係合する係合凹部を三個所に有し前記
入、出力軸の他方軸側に前記フランジ部に対向して設け
られた反力受部と、前記フランジ部の反力受部と反対側
の他側面側で前記一方軸外周部に形成される油圧反力室
内でこの一方軸上に摺動自在に保持され各ボールを前記
係合凹部内にそれぞれ押圧し反力油圧に応じた拘束力を
入、出力軸間に作用せしめる環状を呈する一個の反力ピ
ストンを備えてなる構成としたものである。
In order to meet the above-mentioned demands, the hydraulic reaction device of the power steering device according to the present invention is provided with three guide holes formed through the flange portion provided on one side of the input and output shafts. Has three balls held slidably in the axial direction and engaging recesses for engaging these balls at three positions, facing the flange portion on the other shaft side of the input / output shaft. And a reaction force receiving portion provided on the other side surface of the flange portion opposite to the reaction force receiving portion, and slidably held on this one shaft in a hydraulic reaction force chamber formed in the outer peripheral portion of the one shaft. In this structure, one reaction force piston having an annular shape that presses each ball into the engaging recess and applies a restraining force corresponding to the reaction force hydraulic pressure to act between the output shafts is provided.

〔作用〕[Action]

本考案によれば、操舵時において入、出力軸間に相対的
な回転変位が生じると、環状を呈する一個の反力ピスト
ンが車輌の各種走行条件等の応じて供給される反力油圧
によって軸線方向に移動し、このピストン端部で一方の
軸側に等配して保持された三個のボールに対し三点接触
状態で当接することにより、これらを軸線方向に向って
均等に押圧し他方軸側の反力受部における各係合凹部に
係合させて所要の拘束力を生じさせ得るものである。
According to the present invention, when a relative rotational displacement occurs between the input and output shafts during steering, one ring-shaped reaction force piston is driven by reaction force hydraulic pressure that is supplied according to various running conditions of the vehicle. In the direction of the piston, and by abutting in a three-point contact state on the three balls held evenly on one shaft side at this piston end, they are pressed uniformly in the axial direction and the other The required restraining force can be generated by engaging with the respective engaging recesses in the reaction force receiving portion on the shaft side.

〔実施例〕〔Example〕

以下、本考案を図面に示した実施例を用いて詳細に説明
する。
Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings.

第1図ないし第4図は本考案に係る動力舵取装置の油圧
反力装置の一実施例を示すものであり、これらの図にお
いて、まず、動力舵取装置におけるパワーステアリング
本体部の概略構成を第4図を用いて簡単に説明すると、
符号10は図示しない舵取ハンドル側に連結される入力軸
(スタブシャフト)、11はこの入力軸10の左端側にトー
ションバー12を介して連結されるとともに図示しない舵
取リンク機構を構成するラック13と噛合するピニオン11
aを有する出力軸(ピニオン軸)で、これら両軸10,11は
その操舵方向に適宜回転操作される。なお、これら入力
軸10、出力軸11間には、周知の通り、一定角度以上回動
されることで当接し両軸10,11を連結するフェールセー
フ機構が付設されている。
1 to 4 show an embodiment of a hydraulic reaction device for a power steering apparatus according to the present invention. In these figures, first, a schematic structure of a power steering main body portion in the power steering apparatus is shown. Will be briefly described with reference to FIG.
Reference numeral 10 is an input shaft (stub shaft) connected to the steering handle side (not shown), and 11 is a rack which is connected to the left end side of the input shaft 10 via a torsion bar 12 and constitutes a steering link mechanism (not shown). Pinion 11 meshing with 13
With an output shaft (pinion shaft) having a, both shafts 10 and 11 are appropriately rotated in the steering direction. As is well known, a fail-safe mechanism is provided between the input shaft 10 and the output shaft 11 so as to contact the shafts 10 and 11 by being rotated by a certain angle or more to connect the shafts 10 and 11.

また、パワーステアリング本体部を構成するボディ14,1
5内で上述した両軸10,11には、回転式流路切換弁16を構
成するロータ17およびスリーブ18がそれぞれ一体的に設
けられ、その相対的な回転変位で図示しないオイルポン
プP、オイルタンクTとパワーシリンダの左、右シリン
ダ室(C1,C2)との間の流路切換えを行なうように構成
されている。なお、このような回転式流路切換弁16の構
成および動作等は従来から周知の通りで、その詳細な説
明は省略する。
In addition, the body 14,1 that constitutes the power steering main body
A rotor 17 and a sleeve 18 that constitute the rotary flow path switching valve 16 are integrally provided on the shafts 10 and 11 described above in FIG. The flow path is switched between the tank T and the left and right cylinder chambers (C1, C2) of the power cylinder. The configuration, operation, etc. of the rotary flow path switching valve 16 are well known in the art, and a detailed description thereof will be omitted.

20は流路切換弁16を構成するロータ17およびスリーブ18
と一体的な入、出力軸10,11間に設けられた本考案に係
る油圧反力装置で、この油圧反力装置20は、第1図ない
し第3図から明らかなように、出力軸11に設けられたフ
ランジ部21に等配して形成された軸線方向に貫通されて
いる三個のガイド孔22と、これら三個のガイド孔22内で
軸線方向にのみ摺動自在に保持された三個のボール23
と、これら各ボール23が係合する回転方向両側が傾斜面
24a,24aとされている係合凹部24を三個所に有し入力軸1
0に前記フランジ部21の一側面と対向して設けられた反
力受部25と、前記フランジ部21の他側面側で出力軸11の
外周部に形成された油圧反力室26と、この油圧反力室26
内に前記入、出力軸10,11と同軸上で摺動自在に保持さ
れ前記各ボール23を反力受部25の係合凹部24内にそれぞ
れ押圧し反力油圧に応じて拘束力を入、出力軸10,11間
に作用せしめる環状を呈する一個の反力ピストン27とに
よって構成されている。
Reference numeral 20 denotes a rotor 17 and a sleeve 18 which form the flow path switching valve 16.
The hydraulic reaction device according to the present invention is provided between the input and output shafts 10 and 11 integrated with the output shaft 11 as shown in FIGS. 1 to 3. And three guide holes 22 formed in the flange portion 21 provided in the same and penetrating in the axial direction, and slidably held only in the axial direction within these three guide holes 22. Three balls 23
And the inclined surfaces on both sides in the rotational direction in which these balls 23 engage.
The input shaft 1 has engaging recesses 24, which are referred to as 24a and 24a, at three locations.
The reaction force receiving portion 25 provided on one side of the flange portion 21 facing the side surface of the flange portion 21, the hydraulic reaction force chamber 26 formed on the outer peripheral portion of the output shaft 11 on the other side surface side of the flange portion 21, Hydraulic reaction chamber 26
The input and output shafts 10 and 11 are slidably held coaxially and the balls 23 are pressed into the engaging recesses 24 of the reaction force receiving portion 25 to apply a restraining force according to the reaction force hydraulic pressure. , And one reaction force piston 27 having an annular shape that acts between the output shafts 10 and 11.

なお、図中28は前記油圧反力室26の他端側をシールする
ために出力軸11外周部にわずかな油密クリアランスをも
って嵌装されたシール部材で、その外周部にはボディ14
との間をシールするシールリング28aが設けられてい
る。しかし、このようなシール部材28を省略し、図中29
で示すオイルシールでシールしてもよいことは勿論であ
る。また、図中30は油圧反力室26内に配設され反力ピス
トン27を常時ボール23側に付勢してボール23の無用な移
動を阻止するセットスプリングとしての波状ばねであ
る。
Reference numeral 28 in the drawing denotes a seal member fitted to the outer peripheral portion of the output shaft 11 with a slight oil-tight clearance for sealing the other end side of the hydraulic reaction chamber 26.
A seal ring 28a is provided to seal the gap between and. However, such a seal member 28 is omitted, and 29 in the figure is used.
Needless to say, the oil seal may be used for sealing. Reference numeral 30 in the figure denotes a wave spring as a set spring which is disposed in the hydraulic reaction force chamber 26 and constantly urges the reaction force piston 27 toward the ball 23 side to prevent the ball 23 from moving unnecessarily.

そして、このような構成とされている本考案による油圧
反力装置20によれば、ボディ14内で軸線方向に移動され
る一個の環状を呈する反力ピストン27の右端部が油圧反
力室26内に臨み油圧反力を受ける受圧面とされているた
め、径方向において必要最小限のスペース内で受圧面積
を従来に比べて増大させることができ、これによりこの
油圧反力装置20付設部分での小型かつコンパクト化を達
成し得るとともに、相対的に所要の油圧反力を得るため
の油圧発生源を小さくして得る等の利点がある。
Further, according to the hydraulic reaction force device 20 of the present invention having such a configuration, the right end portion of the single reaction ring piston 27 that is moved in the axial direction inside the body 14 has the right end portion of the hydraulic reaction chamber 26. Since it is a pressure receiving surface that faces the inside and receives the hydraulic reaction force, it is possible to increase the pressure receiving area in the minimum necessary space in the radial direction compared to the conventional one. It is possible to achieve small size and compactness, and to obtain a relatively small hydraulic pressure generation source for obtaining a required hydraulic reaction force.

また、本考案によれば、反力ピストン27による軸線方向
での推力を、入力軸11側の反力受部25に伝達するための
ボール23として、出力軸12側のフランジ部21に対して12
0°毎に等配して保持させた三個を用いており、これに
よりこれらボール23の反力ピストン27に対する接触点が
常に同一平面上に位置する三点接触状態とすることがで
き、これら三個のボール23に対して反力ピストン27の端
部を均等に面接触させ、これら全てのボール23を介して
油圧反力を反力受部25側に作用させ得るものである。特
に、上述したボール23は加工精度等の理由からわずかで
はあるが、その径寸法が異なっているものであり、また
これらが係合する係合凹部24側も同様で、反力ピストン
27の各ボール23に対する当り位置が軸線方向においてず
れを生じている場合が多い。しかし、本考案によれば、
三個のボール23を介しての三点接触であるため、上述し
た位置ずれを吸収するように反力ピストン27を追随させ
て動作させ得るもので、油圧反力を反力ピストン27側か
ら反力受部25側に適切かつ確実に伝達することが可能
で、その利点は大きい。このような利点は、たとえば四
個のボールおよび係合凹部を用い、これに反力ピストン
を当接させて油圧反力を生じさせようとした場合に、一
個のボール等が小さすぎたりして、反力ピストンからの
推力を均等に伝達し得ず、適切な油圧反力を得られず、
しかも入、出力軸にこじり力等が生じることになる等か
ら、容易に理解されよう。
Further, according to the present invention, as the ball 23 for transmitting the thrust force in the axial direction by the reaction force piston 27 to the reaction force receiving portion 25 on the input shaft 11 side, with respect to the flange portion 21 on the output shaft 12 side. 12
Three pieces are used which are evenly arranged and held at every 0 °, so that the contact points of these balls 23 with respect to the reaction force piston 27 can always be in a three-point contact state on the same plane. The end portions of the reaction force pistons 27 are evenly brought into surface contact with the three balls 23, and the hydraulic reaction force can be exerted on the reaction force receiving portion 25 side via all of these balls 23. In particular, the above-mentioned balls 23 are slightly different from each other for reasons such as processing accuracy, but their diameters are different, and the engaging recess 24 side with which they engage is also the same, and the reaction piston
In many cases, the contact position of 27 with respect to each ball 23 is displaced in the axial direction. However, according to the present invention,
Since the three-point contact is made through the three balls 23, the reaction force piston 27 can be operated by following the above-mentioned displacement so that the hydraulic reaction force is not applied from the reaction force piston 27 side. It can be appropriately and reliably transmitted to the force receiving portion 25 side, which is a great advantage. Such an advantage is that, for example, when four balls and engaging recesses are used and a reaction piston is brought into contact with them to generate a hydraulic reaction force, one ball or the like is too small. , The thrust from the reaction force piston cannot be transmitted evenly, and an appropriate hydraulic reaction force cannot be obtained,
In addition, a twisting force or the like will be generated on the input and output shafts, which can be easily understood.

すなわち、上述した本考案による構成では、反力ピスト
ン27からの推力を、ボール23を介して反力受部25に伝達
するにあたって周方向で均等な力を作用させることがで
き、これにより入、出力軸に対し無用な曲げ力等が作用
し、操舵力変動やブッシュ等の損傷等といった問題を招
くことはなくなり、装置性能面で優れている。さらに、
本考案によれば、ボール23を始め、これらのボール23を
保持するガイド孔22や反力受部25の係合凹部24等の加工
も比較的容易に行なえることは、容易に理解されよう。
That is, in the above-mentioned configuration according to the present invention, a uniform force can be applied in the circumferential direction when the thrust force from the reaction force piston 27 is transmitted to the reaction force receiving portion 25 via the ball 23, which allows This is excellent in terms of device performance, since unnecessary bending force or the like acts on the output shaft and causes no problems such as steering force fluctuations or damage to the bushes. further,
According to the present invention, it can be easily understood that the processing of the balls 23, the guide holes 22 for holding the balls 23, the engagement recesses 24 of the reaction force receiving portion 25, and the like can be performed relatively easily. .

また、本実施例によれば、車速等といった車輌の各種走
行条件に応じて適宜供給される反力油圧により軸線方向
右側に移動される反力ピストン27の左端部で出力軸11側
のガイド孔22内に保持されているボール23を押圧するこ
とで、これらボール23を入力軸10側の反力受部25の係合
凹部24内に係入するように軸線方向に押圧し得るもので
あり、これにより油圧反力による所要の拘束力が得ら
れ、入、出力軸10,11間での相対的な回転状態を適宜拘
束し、必要とされる操舵反力を得て適切な操舵力制御を
行なうことが可能となるものである。すなわち、上述し
た操舵時において入力軸10側が回転されると、第5図
(a),(b)および第6図(a),(b)から明らか
なように、ボール23は係合凹部24のいずれか一方の傾斜
面24aに乗上げ、この傾斜量だけ軸線方向に移動し、こ
のときに反力ピストン27を押圧することによる反力が操
舵反力として入力軸10側に伝達されるものである。ここ
で、第5図は直進走行時を、第6図は操舵時を示してお
り、また図中Fが反力ピストン27からの推力、θは係合
凹部24の傾斜面角度、lは軸心からボール23の当接位置
までの長さとすると、入、出力軸10,11間で生じるF T
(F tanθ)という分力から、反力トルクT=F T×lと
いう油圧反力が得られることになる。
Further, according to the present embodiment, the left end portion of the reaction force piston 27 that is moved to the right in the axial direction by the reaction force hydraulic pressure that is appropriately supplied according to various traveling conditions of the vehicle such as the vehicle speed and the like, is a guide hole on the output shaft 11 side. By pressing the balls 23 held in the inside 22, it is possible to press the balls 23 in the axial direction so as to engage these balls 23 into the engaging recesses 24 of the reaction force receiving portion 25 on the input shaft 10 side. By doing so, the required restraint force due to the hydraulic reaction force is obtained, the relative rotation state between the input and output shafts 10 and 11 is restrained as appropriate, and the required steering reaction force is obtained to achieve appropriate steering force control. It is possible to do. That is, when the input shaft 10 side is rotated during the above-described steering, as is clear from FIGS. 5 (a) and (b) and FIGS. 6 (a) and (b), the ball 23 engages with the engaging recess 24. One of which is mounted on one of the inclined surfaces 24a, moves in the axial direction by this inclination amount, and at this time, the reaction force generated by pressing the reaction force piston 27 is transmitted to the input shaft 10 side as the steering reaction force. Is. Here, FIG. 5 shows a straight running state and FIG. 6 shows a steering state. Further, in the figure, F is the thrust from the reaction force piston 27, θ is the angle of the inclined surface of the engaging recess 24, and 1 is the axis. Assuming the length from the center to the contact position of the ball 23, the FT generated between the input and output shafts 10 and 11
From the component force of (F tan θ), a hydraulic reaction force of reaction torque T = FT × l can be obtained.

そして、この場合において、上述した構成によれば、ボ
ール23は、ガイド孔22や係合凹部24の傾斜面24a、さら
にはピストン27端面にころがり接触で接触することか
ら、摺動抵抗等が小さく摩擦力の発生が少なく、これに
よりシールリングを付設することで問題とされる回転方
向での摺動抵抗の増加等を相殺し、流路切換弁16や舵取
ハンドルの円滑かつ適切な回転動作を得ることが可能で
ある等の利点がある。
Then, in this case, according to the above-described configuration, the ball 23 comes into rolling contact with the guide hole 22, the inclined surface 24a of the engaging recess 24, and the end surface of the piston 27, so that the sliding resistance and the like are small. Frictional force is less generated, which offsets the increase in sliding resistance in the direction of rotation that is a problem due to the attachment of a seal ring, and smooth and appropriate rotation operation of the flow path switching valve 16 and the steering wheel. It is possible to obtain

また、本実施例によれば、反力ピストン27を、出力軸11
外周部およびボディ14内周部に対しそれぞれ所要のクリ
アランスをもって対向させるとともに、その内、外周部
に一対をなすシールリング27a,27bを設けることで、油
圧反力室26左端側でのシール性を確保した状態で、出力
軸11上を軸線方向に摺動自在に支持するように構成して
いる。そして、このような構成とすることにより、第7
図から明らかなように、反力受部25の係合凹部24に係合
するボール23に対し、反力ピストン27がその軸線方向へ
の位置ずれを吸収して平面接触するような傾斜動作(フ
ローティング)状態を許容できるものである。すなわ
ち、上述した構成では、反力ピストン27は、出力軸11上
で傾斜可能に支持されるもので、これによりボール23の
径寸法や係合凹部24の加工精度等によってボール23との
当り面が軸線と直交する面よりも傾斜したとしても、こ
れに追随して変位し、反力ピストン27の各ボール23への
均等な接触状態を常に確保し、その結果反力ピストン27
の作動状態を安定化させ得るものである。さらに、この
ような構成では、簡単なシールリング27a,27bによるシ
ール構造で反力ピストン27内、外周のシール性を簡単か
つ確実に確保し得るとともに、反力ピストン27等の加工
精度が要求されず、加工性の面で有利である等の利点が
ある。
Further, according to this embodiment, the reaction force piston 27 is connected to the output shaft 11
By facing each of the outer peripheral portion and the inner peripheral portion of the body 14 with a required clearance, and by providing a pair of seal rings 27a and 27b in the inner peripheral portion thereof, a sealing property on the left end side of the hydraulic reaction force chamber 26 is provided. In the secured state, the output shaft 11 is configured to be slidably supported in the axial direction. Then, with such a configuration, the seventh
As is apparent from the figure, the reaction piston 27 absorbs the axial displacement of the ball 23 that engages with the engaging recess 24 of the reaction force receiving portion 25 and makes a tilting motion such that the reaction force piston 27 makes a plane contact ( Floating) state is acceptable. That is, in the above-described configuration, the reaction force piston 27 is supported so as to be tiltable on the output shaft 11, and as a result, the contact surface with the ball 23 depends on the diameter size of the ball 23, the processing accuracy of the engaging recess 24, and the like. Even if is inclined with respect to the plane orthogonal to the axis, it is displaced following this and always maintains a uniform contact state of the reaction force piston 27 with each ball 23.
The operating state of can be stabilized. Further, in such a configuration, the seal structure of the reaction force piston 27 and the outer periphery can be easily and surely secured by the sealing structure with the simple seal rings 27a and 27b, and the processing accuracy of the reaction force piston 27 and the like is required. However, there are advantages such as being advantageous in terms of workability.

ここで、上述した反力ピストン27としては、その内周部
でのクリアランスが外周部よりも小さくなるようにし、
出力軸11上での摺動動作を確保しつつ若干の傾斜が可能
で、しかも外周部側では傾斜時においてボディ14側に干
渉しないようにするとよい。また、この反力ピストン27
の内、外周部に設けられるシールリング27a,27bとして
は、所要のしめ代を有し、傾斜時のシール性を確保する
とともに、内側のシールリング27aでは出力軸11上での
調心機能をもつようにするとよい。さらに、本実施例で
は、反力ピストン27の内、外周部に設けられるシールリ
ング27a,27bを、軸線方向に位置をずらして設けている
が、これは反力ピストン27の径方向での大型化を防ぐた
めである。
Here, as the above-mentioned reaction force piston 27, the clearance at the inner peripheral portion is made smaller than that at the outer peripheral portion,
It is advisable to allow a slight inclination while ensuring the sliding operation on the output shaft 11, and to prevent the outer peripheral side from interfering with the body 14 side during inclination. In addition, this reaction force piston 27
Of the above, the seal rings 27a and 27b provided on the outer peripheral portion have a required tightening allowance and ensure the sealing performance at the time of inclination, and the inner seal ring 27a has an aligning function on the output shaft 11. You should keep it. Further, in the present embodiment, the seal rings 27a, 27b provided on the outer peripheral portion of the reaction force piston 27 are provided so as to be displaced in the axial direction, but this is a large size in the radial direction of the reaction force piston 27. This is to prevent aging.

なお、本考案は上述した実施例構造に限定されず、装置
各部の形状、構造等を、適宜変形、変更することは自由
である。たとえば上述した実施例では、ボール23を出力
軸11側に、係合凹部24を有する反力受部25を入力軸10側
に設けた場合を説明したが、本考案はこれに限定され
ず、入、出力軸10,11を逆に構成してもよいことは容易
に理解されよう。
It should be noted that the present invention is not limited to the structure of the embodiment described above, and the shape, structure, etc. of each part of the apparatus can be freely modified or changed. For example, in the above-described embodiment, the case where the ball 23 is provided on the output shaft 11 side and the reaction force receiving portion 25 having the engagement recess 24 on the input shaft 10 side has been described, but the present invention is not limited to this. It will be readily understood that the input and output shafts 10, 11 may be configured in reverse.

〔考案の効果〕[Effect of device]

以上説明したように本考案に係る動力舵取装置の油圧反
力装置によれば、三個のボールを、入、出力軸の一方の
軸側に設けたフランジ部に等配して貫通形成した三個の
ガイド孔内にそれぞれ軸線方向に摺動自在に保持させる
とともに、これら各ボールが係合する係合凹部を三個所
に有する反力受部を、入、出力軸の他方軸側に前記フラ
ンジ部の一側面と対向して設け、かつ前記フランジ部他
側面側に形成した油圧反力室内に入、出力軸と同軸上で
摺動自在に保持され前記各ボールを係合凹部内に押圧し
反力油圧に応じた拘束力を入、出力軸間に作用せしめる
環状を呈する一個の反力ピストンを設けるようにしたの
で、簡単かつ安価な構成にもかかわらず、ボール、係合
凹部を有する反力受部および受圧面積の大きな反力ピス
トン等を限られたスペース内に適切かつ確実に配設する
ことが可能で、これにより装置全体の径方向の小型かつ
コンパクト化を図り、また小さい反力油圧で大きな反力
トルクを得ることが可能となることから、別置の小型ポ
ンプを反力油圧源として用いることも可能で、さらにボ
ールの転動接触により安定した滑らかな作動状態を得る
ことができる等といった実用上種々優れた効果がある。
また、本考案によれば、反力ピストンの端部を三個のボ
ールに対し同一平面上での三点接触で接触させることが
でき、これによる反力ピストンからの推力を各ボールを
介して均等に反力受部側に伝達でき、安定した反力トル
クを適切かつ確実に得ることができ、油圧反力装置とし
ての性能を発揮し得るものである。
As described above, according to the hydraulic reaction force device of the power steering apparatus of the present invention, three balls are formed by penetrating equally through the flange portion provided on one shaft side of the input / output shaft. A reaction force receiving portion, which is held slidably in the axial direction in each of the three guide holes, and has engaging recesses for engaging each ball at three locations, is provided on the other side of the input and output shafts. It is provided so as to face one side surface of the flange portion and enters the hydraulic reaction chamber formed on the other side surface side of the flange portion, and is slidably held coaxially with the output shaft and presses each ball into the engaging concave portion. Since a single reaction piston having an annular shape that applies a restraining force corresponding to the reaction force hydraulic pressure and acts between the output shafts is provided, it has a ball and an engaging recess despite the simple and inexpensive structure. Limited reaction force receiving part and reaction force piston with large pressure receiving area It is possible to arrange it appropriately and surely in the pace, thereby making it possible to reduce the size and size of the entire device in the radial direction, and to obtain a large reaction torque with a small reaction force hydraulic pressure. It is possible to use a small pump separately installed as a reaction force hydraulic power source, and it is possible to obtain a stable and smooth operating state by rolling contact of the balls, and there are various excellent effects in practical use.
Further, according to the present invention, the end of the reaction force piston can be brought into contact with three balls by three-point contact on the same plane, and the thrust force from the reaction force piston due to this can be transmitted through each ball. The force can be evenly transmitted to the reaction force receiving portion side, a stable reaction force torque can be appropriately and reliably obtained, and the performance as a hydraulic reaction force device can be exhibited.

【図面の簡単な説明】[Brief description of drawings]

第1図は本考案に係る動力舵取装置の油圧反力装置の一
実施例を示す要部縦断面図、第2図はそのII-II線断面
図、第3図は同じく要部分解斜視図、第4図は動力舵取
装置全体の概略断面図、第5図(a),(b)および第
6図(a),(b)はボールの反力受部への係合状態を
説明するための説明図、第7図は反力ピストンのフロー
ティング状態を説明するための要部拡大断面図である。 10……入力軸、11……出力軸、12……トーションバー、
16……回転式流路切換弁、20……油圧反力装置、21……
フランジ部、22……ガイド孔、23……ボール、24……係
合凹部、24a……傾斜面、25……反力受部、26……油圧
反力室、27……反力ピストン。
FIG. 1 is a longitudinal sectional view of an essential part showing an embodiment of a hydraulic reaction device for a power steering apparatus according to the present invention, FIG. 2 is a sectional view taken along the line II-II, and FIG. Figures and 4 are schematic cross-sectional views of the entire power steering apparatus, and Figures 5 (a) and (b) and Figures 6 (a) and (b) show the engagement state of the ball with the reaction force receiving portion. FIG. 7 is an explanatory view for explaining, and FIG. 7 is an enlarged sectional view of a main part for explaining a floating state of the reaction force piston. 10 …… input shaft, 11 …… output shaft, 12 …… torsion bar,
16 …… Rotary flow path switching valve, 20 …… Hydraulic reaction force device, 21 ……
Flange, 22 ... Guide hole, 23 ... Ball, 24 ... Engagement recess, 24a ... Inclined surface, 25 ... Reaction force receiving section, 26 ... Hydraulic reaction chamber, 27 ... Reaction force piston.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項1】入、出力軸の一方軸側に設けられたフラン
ジ部に等配して形成され軸線方向に貫通する三個のガイ
ド孔と、これら各ガイド孔内で軸線方向にのみ摺動自在
に保持された三個のボールと、これら各ボールが係合す
る係合凹部を三個所に有し前記入、出力軸の他方軸側に
前記フランジ部の一側面と対向して設けられた反力受部
と、前記フランジ部の反力受部と反対側の他側面側で
入、出力軸の一方軸外周側に形成された油圧反力室と、
この油圧反力室内で前記入、出力軸の一方軸上に摺動自
在に保持され前記各ボールを反力受部の係合凹部内にそ
れぞれ押圧し反力油圧に応じた拘束力を入、出力軸間に
作用せしめる環状を呈する一個の反力ピストンとを備え
たことを特徴とする動力舵取装置の油圧反力装置。
Claims: 1. Three guide holes which are equally arranged on a flange portion provided on one shaft side of the input and output shafts and penetrate in the axial direction, and slide only in the axial direction in each of these guide holes. Three freely held balls and three engaging recesses for engaging the balls are provided at the other shaft side of the input and output shafts so as to face one side surface of the flange part. A reaction force receiving portion, and a hydraulic reaction force chamber formed on the outer peripheral side of one shaft of the output shaft, which is inserted on the other side surface side of the flange portion opposite to the reaction force receiving portion.
In the hydraulic reaction force chamber, the input and output shafts are slidably held on one shaft to press the respective balls into the engaging recesses of the reaction force receiving portion to apply a restraining force corresponding to the reaction force hydraulic pressure, A hydraulic reaction force device for a power steering device, comprising: a single reaction force piston having an annular shape that acts between output shafts.
JP13999587U 1987-09-16 1987-09-16 Hydraulic reaction force device of power steering device Expired - Lifetime JPH078349Y2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP13999587U JPH078349Y2 (en) 1987-09-16 1987-09-16 Hydraulic reaction force device of power steering device
US07/231,808 US4877100A (en) 1987-09-16 1988-08-12 Hydraulic reaction force apparatus for power steering system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13999587U JPH078349Y2 (en) 1987-09-16 1987-09-16 Hydraulic reaction force device of power steering device

Publications (2)

Publication Number Publication Date
JPS6444878U JPS6444878U (en) 1989-03-17
JPH078349Y2 true JPH078349Y2 (en) 1995-03-01

Family

ID=31403762

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13999587U Expired - Lifetime JPH078349Y2 (en) 1987-09-16 1987-09-16 Hydraulic reaction force device of power steering device

Country Status (1)

Country Link
JP (1) JPH078349Y2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03223588A (en) * 1990-01-30 1991-10-02 Sumitomo Heavy Ind Ltd Airtight seal piping connecting device

Also Published As

Publication number Publication date
JPS6444878U (en) 1989-03-17

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