JPH0121111Y2

JPH0121111Y2 -

Info

Publication number: JPH0121111Y2
Application number: JP892682U
Authority: JP
Priority date: 1982-01-26
Filing date: 1982-01-26
Publication date: 1989-06-23
Also published as: JPS58111670U

Description

【考案の詳細な説明】本考案は車両用動力舵取装置に関する。[Detailed explanation of the idea] The present invention relates to a power steering device for a vehicle.

車両においては、操舵後ハンドルから手を離し
た場合、サスペンシヨンジオメトリとタイヤのセ
ルフアライニング作用により、ハンドルが直進位
置に自動的に戻るように構成されている。しかし
て、車両、特に前輪駆動車の加速時には上記した
作用が強く、ハンドルが戻りすぎて直進位置に収
束する（戻る）のが遅れるといつた現象がみられ
る。 In a vehicle, when the handle is released after steering, the steering wheel is configured to automatically return to the straight-ahead position due to the self-aligning action of the suspension geometry and tires. However, when a vehicle, especially a front-wheel drive vehicle, accelerates, the above-mentioned effect is strong, causing the steering wheel to return too far, resulting in a delay in converging (returning) to the straight-ahead position.

本考案はかかる実状に鑑みなされたもので、そ
の目的は車両用動力舵取装置を改良して車両の加
速時におけるハンドルの直進位置への収束性を向
上させることにある。また本考案の要旨は、車両
用動力舵取装置において、その構成部材である４
方切換弁とパワーシリンダの各油室を接続する管
路中に、４方切換弁から各油室への流れを第１の
流路を通して許容する一方向弁と、車両の加速度
に応答して第２の流路を絞る絞り弁とを並列に備
える流量制御弁を介装したことにある。 The present invention was developed in view of the above circumstances, and its purpose is to improve the power steering system for a vehicle to improve the convergence of the steering wheel to the straight-ahead position when the vehicle accelerates. Further, the gist of the present invention is to provide a power steering system for a vehicle, which is a component thereof.
In the pipe line connecting the four-way switching valve and each oil chamber of the power cylinder, there is a one-way valve that allows flow from the four-way switching valve to each oil chamber through a first flow path, and a one-way valve that responds to the acceleration of the vehicle. This is because a flow rate control valve is provided in parallel with a throttle valve that throttles the second flow path.

以下に本考案の一実施例を図面に基づいて説明
する。第１図は本考案による車両用動力舵取装置
１００を概略的に示していて、この車両用動力舵
取装置１００は公知のパワーシリンダ１０及び４
方切換弁２０を備えている。パワーシリンダ１０
は、図示しない操舵輪に作動的に連結されたピス
トン１１を有するとともに、このピストン１１の
両側に形成された一対の油室１２，１３を有して
いる。４方切換弁２０は、パワーシリンダ１０の
両油室１２，１３、油圧ポンプ３０及びリザーバ
タンク４０にそれぞれ接続されていて、パワーシ
リンダ１０の各油室１２，１３に供給される作動
油をハンドル操作に応答して制御する。 An embodiment of the present invention will be described below based on the drawings. FIG. 1 schematically shows a power steering device 100 for a vehicle according to the present invention.
A one-way switching valve 20 is provided. power cylinder 10
has a piston 11 operatively connected to a steering wheel (not shown) and a pair of oil chambers 12 and 13 formed on both sides of the piston 11. The four-way switching valve 20 is connected to both oil chambers 12 and 13 of the power cylinder 10, a hydraulic pump 30, and a reservoir tank 40, respectively, and allows hydraulic oil supplied to each oil chamber 12 and 13 of the power cylinder 10 to be connected to the handlebar. Control in response to operations.

しかして、本実施例においては、４方切換弁２
０とパワーシリンダ１０の両油室１２，１３をそ
れぞれ接続する各管路P₁，P₂中に流量制御弁５
０，５０がそれぞれ介装されている。流量制御弁
５０は、第２図にて示したように、４方切換弁２
０から各油室１２又は１３への流れを流路Ａを通
して許容する一方向弁V₁と、車両の加速度に応
答して流路Ｂを絞る絞り弁V₂とを並列に備えて
いる。一方向弁V₁は、ハウジング５１に嵌着し
たＣ形状のサークリツプ５２、このサークリツプ
５２に着座する弁体５３、及びこの弁体５３をサ
ークリツプ５２に向けて付勢するコイルスプリン
グ５４によつて構成されていて、固定絞り付一方
向弁として機能する。絞り弁V₂は、ハウジング
５１に形成した環状溝５１ａ、この環状溝５１ａ
に対応する環状溝５５ａを中間部に有する軸方向
（図示左右方向）へ摺動可能なスプール５５、及
びこのスプール５５を図示右方へ付勢するコイル
スプリング５６を主要構成部材としており、スプ
ール５５の初期位置はハウジング５１に螺着され
ロツクナツト５８により固定されたプラグ５７に
より調整可能となつている。このように構成され
た流量制御弁５０は、図示左右方向が車両の前後
方向に一致し、かつ図示右方が車両の前方に一致
するようにして図示しない車体に取付けられてい
て、車両の加速時にはスプール５５が図示左方へ
摺動して流路Ｂを絞り、その他の時にはスプール
５５が図示位置にあつて流路Ｂを全開状態とす
る。 However, in this embodiment, the four-way switching valve 2
A flow control valve 5 is installed in each pipe _P1 , _P2 connecting the oil chambers 12, 13 of the power cylinder 10 and the power cylinder 10, respectively.
0 and 50 are respectively interposed. As shown in FIG. 2, the flow rate control valve 50 is a four-way switching valve 2.
A one-way valve V ₁ that allows flow from 0 to each oil chamber 12 or 13 through a flow path A, and a throttle valve V ₂ that throttles the flow path B in response to acceleration of the vehicle are provided in parallel. The one-way valve _V1 is composed of a C-shaped circlip 52 fitted into a housing 51, a valve body 53 seated on this circlip 52, and a coil spring 54 that biases this valve body 53 toward the circlip 52. It functions as a one-way valve with a fixed throttle. The throttle valve _V2 includes an annular groove 51a formed in the housing 51, and an annular groove 51a formed in the housing 51.
The main components are a spool 55 that has an annular groove 55a in the middle portion corresponding to the spool 55 and is slidable in the axial direction (left and right directions in the figure), and a coil spring 56 that urges the spool 55 to the right in the figure. The initial position of can be adjusted by a plug 57 screwed onto the housing 51 and fixed by a lock nut 58. The flow rate control valve 50 configured as described above is attached to a vehicle body (not shown) so that the left and right direction in the drawing corresponds to the longitudinal direction of the vehicle, and the right direction in the drawing corresponds to the front of the vehicle, and is installed in a vehicle body (not shown) such that the right direction in the drawing corresponds to the front of the vehicle. At times, the spool 55 slides to the left in the figure to narrow the flow path B, and at other times, the spool 55 is in the position shown in the figure to fully open the flow path B.

上記のように構成した本実施例においては、当
該車両の定速・減速時又は停止時、両流量制御弁
５０，５０においてスプール５５が第２図図示の
ごとくプラグ５７に当接していて、流路Ｂが全開
状態となつている。このため、このときにハンド
ル操作をしても、当該車両用動力舵取装置１００
は両流量制御弁５０，５０を備えていない従来の
車両用動力舵取装置と同様に作動する。また、当
該車両の加速時には、両流量制御弁５０，５０に
おいてスプール５５が第２図図示左方へ摺動して
流路Ｂを絞る。このため、このときにハンドル操
作をすれば、油圧ポンプ３０から４方向切換弁２
０を介してパワーシリンダ１０の一方の油室１２
又は１３に供給される作動油の大部分が一方の流
量制御弁５０において一方向弁V₁を通り、また
他方の油室１３又は１２から排出される作動油が
他方の流量制御弁５０において絞り弁V₂及び一
方向弁V₁の固定絞りを通り４方切換弁２０を介
してリザーバタンク４０に流れる。このときに
は、他方の油室１３又は１２からリザーバタンク
４０に流れる作動油が他方の流量制御弁５０にお
いて絞られるものの、他方の油室１３又は１２内
の油圧が油圧ポンプ３０から一方の油室１２又は
１３に供給された高圧の作動油によつて高められ
ているため、操舵フイーリングは他の場合とほと
んど変わらない。 In this embodiment configured as described above, when the vehicle is at constant speed, decelerated, or stopped, the spool 55 of both flow control valves 50, 50 is in contact with the plug 57 as shown in FIG. Route B is fully open. Therefore, even if the steering wheel is operated at this time, the power steering device 100 for the vehicle
operates in the same manner as a conventional vehicle power steering system that does not include both flow control valves 50, 50. Further, when the vehicle accelerates, the spools 55 of both flow rate control valves 50, 50 slide to the left in FIG. 2 to narrow the flow path B. Therefore, if the handle is operated at this time, the hydraulic pump 30 will be connected to the four-way switching valve 2.
0 to one oil chamber 12 of the power cylinder 10
or 13 passes through the one-way valve _V1 in one flow control valve 50, and the hydraulic oil discharged from the other oil chamber 13 or 12 is throttled in the other flow control valve 50. It passes through the fixed throttles of the valve V ₂ and the one-way valve V ₁ and flows through the four-way switching valve 20 to the reservoir tank 40 . At this time, although the hydraulic oil flowing from the other oil chamber 13 or 12 to the reservoir tank 40 is throttled by the other flow control valve 50, the oil pressure in the other oil chamber 13 or 12 is transferred from the hydraulic pump 30 to the one oil chamber 12. Or, since it is enhanced by the high pressure hydraulic oil supplied to 13, the steering feeling is almost the same as in other cases.

ところで、上記のように当該車両の加速時にお
いてハンドル操作した後ハンドルから手を離せ
ば、サスペンシヨンジオメトリとタイヤの強いセ
ルフアライニング作用により、ハンドルが直進位
置に戻されるわけであるが、このときには一方の
油室１２又は１３から排出される作動油が一方の
流量制御弁５０において絞られ、上記した作用が
弱められるため、ハンドルの戻りすぎ（オーバシ
ユート）が抑制され、ハンドルは直進位置へ早く
収束する。 By the way, as mentioned above, if you take your hands off the steering wheel after operating the steering wheel when the vehicle is accelerating, the suspension geometry and strong self-aligning action of the tires will return the steering wheel to the straight-ahead position. The hydraulic oil discharged from one of the oil chambers 12 or 13 is throttled by one of the flow control valves 50, and the above-mentioned effect is weakened, so the steering wheel is prevented from returning too far (overshoot), and the steering wheel quickly converges to the straight-ahead position. do.

なお、上記実施例において、車両の加速時に絞
り弁V₂においてスプール５５が流路Ｂを完全に
絞らないように（閉じないように）設定すれば、
一方向弁V₁において固定絞りを不要とすること
も可能である。また上記実施例においては、両管
路P₁，P₂中に流量制御弁５０，５０をそれぞれ
介装したが、本考案の実施に際しては、いずれか
一方の管路P₁又はP₂中にのみ流量制御弁５０を
介装して実施してもよい。 In addition, in the above embodiment, if the spool 55 is set so that the flow path B is not completely throttled (not closed) in the throttle valve V ₂ when the vehicle is accelerated,
It is also possible to dispense with a fixed throttle in the one-way valve _V1 . Furthermore, in the above embodiment, the flow control valves 50 and 50 were interposed in both the pipes P ₁ and P _2, respectively, but when implementing the present invention, the flow control valves 50 and 50 were installed in either the pipes P ₁ or P ₂ Alternatively, only the flow rate control valve 50 may be interposed.

また、本考案は上記実施例のみならず、操舵輪
に作動的に連結されたピストン及び該ピストンの
両側に形成された一対の油室を有するパワーシリ
ンダ、このパワーシリンダの前記各油室、油圧ポ
ンプ及びリザーバタンクにそれぞれ接続され前記
パワーシリンダの各油室に供給される作動油をハ
ンドル操作に応答して制御する４方切換弁を備え
た種々の車両用動力舵取装置においても、上記実
施例と同様に又は適宜変更して実施し得るもので
ある。 The present invention is not limited to the above-mentioned embodiment, but also includes a power cylinder having a piston operatively connected to a steering wheel and a pair of oil chambers formed on both sides of the piston, each of the oil chambers of this power cylinder, and a hydraulic The above-mentioned implementation can also be applied to various vehicle power steering systems equipped with a four-way switching valve that is connected to a pump and a reservoir tank and controls hydraulic oil supplied to each oil chamber of the power cylinder in response to a steering wheel operation. It can be implemented in the same manner as the example or with appropriate changes.

[Brief explanation of the drawing]

第１図は本考案による車両用動力舵取装置の概
略構成図、第２図は第１図に示した流量制御弁の
拡大詳細縦断面図である。符号の説明、１０……パワーシリンダ、１１…
…ピストン、１２，１３……油室、２０……４方
切換弁、３０……油圧ポンプ、４０……リザーバ
タンク、P₁，P₂……４方切換弁と油室を接続す
る管路、５０……流量制御弁、V₁……一方向弁、
V₂……絞り弁、Ａ……（第１の）流路、Ｂ……
（第２の）流路、１００……車両用動力舵取装置。 FIG. 1 is a schematic configuration diagram of a power steering device for a vehicle according to the present invention, and FIG. 2 is an enlarged detailed longitudinal sectional view of the flow control valve shown in FIG. 1. Explanation of symbols, 10... Power cylinder, 11...
... Piston, 12, 13 ... Oil chamber, 20 ... Four-way switching valve, 30 ... Hydraulic pump, 40 ... Reservoir tank, P ₁ , P ₂ ... Piping connecting the four-way switching valve and oil chamber , 50...flow control valve, _V1 ...one-way valve,
V ₂ ... Throttle valve, A ... (first) flow path, B ...
(Second) flow path, 100...Vehicle power steering device.

Claims

[Scope of utility model registration request]

a power cylinder having a piston operatively connected to a steering wheel and a pair of oil chambers formed on both sides of the piston; a power cylinder connected to each of the oil chambers, a hydraulic pump, and a reservoir tank of the power cylinder; In a power steering system for a vehicle equipped with a four-way switching valve that controls hydraulic oil supplied to each oil chamber in response to a steering wheel operation, a pipe connecting the four-way switching valve and each oil chamber has a , a flow rate comprising, in parallel, a one-way valve that allows flow from the four-way switching valve to each oil chamber through a first flow path, and a throttle valve that throttles the second flow path in response to acceleration of the vehicle. A power steering device for a vehicle characterized by having a control valve installed therein.