JPH0537742Y2 - - Google Patents
Info
- Publication number
- JPH0537742Y2 JPH0537742Y2 JP1987016478U JP1647887U JPH0537742Y2 JP H0537742 Y2 JPH0537742 Y2 JP H0537742Y2 JP 1987016478 U JP1987016478 U JP 1987016478U JP 1647887 U JP1647887 U JP 1647887U JP H0537742 Y2 JPH0537742 Y2 JP H0537742Y2
- Authority
- JP
- Japan
- Prior art keywords
- shaft
- steering
- pinion
- rack
- gear
- 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
Links
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 238000003754 machining Methods 0.000 description 4
- 238000004804 winding Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Steering-Linkage Mechanisms And Four-Wheel Steering (AREA)
Description
【考案の詳細な説明】
（産業上の利用分野）
この考案は前後輪操舵車両の電動パワーステア
リング装置、詳しくは、前輪に連結されたラツク
に後輪用の操舵機構と連結されたピニオンを噛合
させるとともに、該ピニオンを電動機に食違い歯
車機構を介し連結した電動パワーステアリング装
置に関する。[Detailed description of the invention] (Field of industrial application) This invention is an electric power steering system for front and rear wheel steering vehicles, specifically, a rack connected to the front wheels engages a pinion connected to a steering mechanism for the rear wheels. The present invention relates to an electric power steering device in which the pinion is coupled to an electric motor via a staggered gear mechanism.
（従来の技術）
前後輪操舵車両は、周知のように、前輪ととも
に後輪を転舵し、旋回性能の向上を図る。このよ
うな前後輪操舵車両に適用される電動パワーステ
アリング装置は、操向ハンドルの操舵に応じて電
動機に給電し、この電動機が出力する操舵補助力
を前輪とともに後輪へ伝達して運転者の操舵負担
を軽減する。(Prior Art) As is well known, front and rear wheel steered vehicles steer the rear wheels together with the front wheels to improve turning performance. An electric power steering device applied to such a vehicle with front and rear wheel steering supplies power to an electric motor in response to steering of the steering wheel, and transmits the steering assist force output from the electric motor to the front wheels and the rear wheels to provide driver assistance. Reduces steering burden.
本出願人にあつても、この種の前後輪操舵車両
に旋用される電動パワーステアリング装置を特願
61−230424号明細書（特開昭63−87371号参照）
（昭和61年９月29日付提出）で提案している。こ
の先願にかかる電動パワーステアリング装置は、
前輪に連結したラツク軸と同軸状に電動機を構成
し、該電動機をボールスクリユ機構を介しラツク
軸に連結するとともに、ラツク軸に操向ハンドル
と連結したピニオンとともに後輪用の操舵機構と
連結したピニオンを噛合させ、その小型化を図つ
たものである。 The present applicant has also filed a patent application for an electric power steering device for use in this type of front and rear wheel steering vehicle.
Specification No. 61-230424 (see JP-A No. 63-87371)
(Submitted on September 29, 1986). The electric power steering device according to this prior application is
An electric motor is configured coaxially with a rack shaft connected to the front wheels, and the electric motor is connected to the rack shaft via a ball screw mechanism, and a pinion is connected to the steering handle and a pinion connected to the steering mechanism for the rear wheels. The design is designed to reduce the size by meshing the two.
（考案が解決しようとする問題点）
しかしながら、上述の先願にかかる前後輪操舵
車両の電動パワーステアリング装置にあつては、
電動機をボールスクリユ機構によりラツク軸に動
力伝達可能に連結するため、ボールスクリユ機構
のボールねじ溝等の高精度加工が不可欠で製造コ
ストが大きく、また、操舵時にラツク軸に曲げモ
ーメントが作用してラツク軸が撓むとボールスク
リユ機構の円滑な作動が阻げられて伝達効率が低
下するという問題点があつた。(Problems to be solved by the invention) However, in the case of the electric power steering device for a front and rear wheel steering vehicle according to the above-mentioned earlier application,
In order to connect the electric motor to the easy shaft using a ball screw mechanism so that power can be transmitted, high-precision machining of the ball screw groove of the ball screw mechanism is essential, which increases manufacturing costs.Furthermore, bending moment acts on the easy shaft during steering, causing the easy shaft to There was a problem in that if the ball screw was bent, smooth operation of the ball screw mechanism was hindered and the transmission efficiency was reduced.
この考案は、上記問題点を鑑みてなされたもの
で、小型が可能で、また、製造コストも低く、さ
らに、操舵時曲のげモーメントの影響を受けない
前後輪操舵車両の電動パワーステアリング装置を
提供することを目的とする。 This idea was made in view of the above problems, and it is possible to create an electric power steering system for front and rear wheel steered vehicles that is compact, has low manufacturing costs, and is not affected by the bending moment during steering. The purpose is to provide.
（問題点を解決するための手段）
この考案は、操向ハンドルに連結された第１の
ピニオンと、該第１のピニオンが噛合する第１の
ラツク歯を有し前輪に連結されたラツク軸と、該
ラツク軸を軸方向摺動可能に支持するとともに前
記第１のピニオンを回転自在に支持するギアハウ
ジングと、該ギアハウジング内に前記ラツク軸と
同軸的に配置されて該ラツク軸に操舵補助力を付
与する電動機と、後輪に転舵可能に連結された後
輪操舵機構と、該後輪操舵機構と前記ラツク軸と
を連結する連結軸と、を備えた前後輪操舵車両の
電動パワーステアリング装置において、
前記ラツク軸に第２のラツク歯を形成するとと
もに、該第２のラツク歯と噛合する第２のピニオ
ンを前記ギアハウジングに回転自在に設け、該第
２のピニオンを前記連結軸と結合するとともに食
違い歯車機構を介して前記電動機に連結したこと
が要旨である。(Means for Solving the Problem) This invention consists of a rack shaft connected to a front wheel, which has a first pinion connected to a steering handle, and a first rack tooth with which the first pinion meshes. a gear housing that supports the rack shaft slidably in the axial direction and rotatably supports the first pinion; An electric front and rear wheel steered vehicle comprising: an electric motor that applies auxiliary force; a rear wheel steering mechanism that is steerably connected to rear wheels; and a connecting shaft that connects the rear wheel steering mechanism and the easy shaft. In the power steering device, second rack teeth are formed on the rack shaft, a second pinion that meshes with the second rack teeth is rotatably provided on the gear housing, and the second pinion is connected to the connection. The gist is that it is connected to the shaft and connected to the electric motor via a staggered gear mechanism.
（作用）
この考案にかかる前後輪操舵車両の電動パワー
ステアリング装置によれば、電動機に食違い歯車
機構を介し連結した第２のピニオンがラツク軸に
形成された第２のラツク歯と噛合して電動機が出
力する操舵補助力をラツク軸に伝達し、また、第
２のピニオンに連結軸を介し後輪操舵機構に連結
して後輪へ操舵力を伝達する。このため、ラツク
軸には、高精度加工が不可欠なボールスクリユ機
構のボールねじ溝等を形成する必要が無く製造コ
ストを低減でき、また、操舵時に曲げモーメント
が作用してラツク軸が撓みを生じても伝達効率等
が影響を受けることは無く円滑な作動が確保され
る。(Function) According to the electric power steering device for a vehicle with front and rear wheel steering according to this invention, the second pinion connected to the electric motor via the staggered gear mechanism meshes with the second rack teeth formed on the rack shaft. The steering assist force output by the electric motor is transmitted to the rack shaft, and the second pinion is connected to the rear wheel steering mechanism via the connecting shaft to transmit the steering force to the rear wheels. Therefore, there is no need to form ball screw grooves for the ball screw mechanism, which require high-precision machining, on the rack shaft, reducing manufacturing costs.In addition, the rack shaft does not bend due to bending moment during steering. However, transmission efficiency etc. are not affected and smooth operation is ensured.
（実施例）
以下、この考案の実施例を図面に基づいて説明
する。(Example) Hereinafter, an example of this invention will be described based on the drawings.
第１図および第２図はこの考案にかかる前後輪
操舵車両の電動パワーステアリング装置の一実施
例を表し、第１図が全体構成図、第２図が要部断
面図である。 FIGS. 1 and 2 show an embodiment of an electric power steering device for a front and rear wheel steered vehicle according to this invention, with FIG. 1 being an overall configuration diagram and FIG. 2 being a sectional view of a main part.
第１図において、１１は操向ハンドルであり、
操向ハンドル１１はステアリング軸１２、中間軸
１３および２つの自在継手１４，１５を介しギア
ケース１６内に収容された前輪操舵機構１７に連
結され、また、この前輪操舵機構１７から連結軸
１８を介して後輪転舵用の後輪操舵機構１９に連
結されている。なお、２０はイグニツシヨンのキ
ースイツチ、２１は車速を検出する車速センサ、
２２はバツテリであり、これらキースイツチ２
０、車速センサ２１およびバツテリ２２は制御駆
動回路２３に結線されている。この制御駆動回路
２３は、車速センサ２１および後述するトルクセ
ンサ等の出力信号を演算処理し、後述する電動機
への通電を制御する。 In FIG. 1, 11 is a steering handle;
The steering handle 11 is connected to a front wheel steering mechanism 17 housed in a gear case 16 via a steering shaft 12, an intermediate shaft 13, and two universal joints 14, 15, and a connecting shaft 18 is connected from this front wheel steering mechanism 17. The rear wheel steering mechanism 19 is connected to a rear wheel steering mechanism 19 for steering the rear wheels. In addition, 20 is an ignition key switch, 21 is a vehicle speed sensor that detects vehicle speed,
22 is a battery, and these key switches 2
0, the vehicle speed sensor 21 and the battery 22 are connected to a control drive circuit 23. The control drive circuit 23 processes output signals from the vehicle speed sensor 21, a torque sensor, etc., which will be described later, and controls energization of the electric motor, which will be described later.
前輪操舵機構１７は、第２図に示すように、ギ
アケース１６内で図示しないピニオン軸に固設さ
れた第１のピニオンギア２４がラツク軸２５に形
成された第１のラツク歯２５ａと噛合している。
ピニオン軸は、前述した第１図に示すようにステ
アリング軸１２等を介して操向ハンドル１１と連
結され、また、図示しないが操舵反力を検出する
トルクセンサが設けられている。このトルクセン
サは、前述のように制御駆動回路２３に接続さ
れ、操舵力すなわち操舵反力を表示する信号を出
力する。 In the front wheel steering mechanism 17, as shown in FIG. 2, a first pinion gear 24 fixed to a pinion shaft (not shown) in the gear case 16 meshes with first rack teeth 25a formed on a rack shaft 25. are doing.
As shown in FIG. 1, the pinion shaft is connected to the steering handle 11 via the steering shaft 12 and the like, and is also provided with a torque sensor (not shown) for detecting steering reaction force. This torque sensor is connected to the control drive circuit 23 as described above, and outputs a signal indicating the steering force, that is, the steering reaction force.
ラツク軸２５は、前述した第１のラツク歯２５
ａの近傍でラツクガイド機構２６を介し、また、
ギアケース１６の第２図中左端との間でメタル軸
受２７を介しギアケース１６に軸方向摺動自在に
支持されている。このラツク軸２５は、前述した
第１のラツク歯２５ａの図中左方の背面側に第２
のラツク歯２５ｂが形成され、第１図にも示すよ
うに、そのギアケース１６外へ突出した左右の両
端がそれぞれボールジヨイント２８Ｌ，２８Ｒ、
タイロツド２９Ｌ，２９Ｒおよびボールジヨイン
ト３０Ｌ，３０Ｒを介し前輪３１FL，３１FRの
ナツクルアーム３２FL，３２FRに連結されてい
る。このラツク軸２５の第２のラツク歯２５ｂ
は、後述する第２のピニオンギアと噛合してい
る。なお、３３FL，３３FRはギアケース１６の
左右の開口端を覆うダストブーツである。 The rack shaft 25 has the aforementioned first rack teeth 25.
via the rack guide mechanism 26 near a, and
It is supported by the gear case 16 via a metal bearing 27 between the left end of the gear case 16 in FIG. 2 so as to be freely slidable in the axial direction. This rack shaft 25 has a second rack on the back side of the first rack tooth 25a on the left side in the figure.
As shown in FIG. 1, both left and right ends protruding outside the gear case 16 are ball joints 28L, 28R, respectively.
It is connected to the knuckle arms 32FL, 32FR of the front wheels 31FL, 31FR via tie rods 29L, 29R and ball joints 30L, 30R. The second rack tooth 25b of this rack shaft 25
meshes with a second pinion gear, which will be described later. Note that 33FL and 33FR are dust boots that cover the left and right open ends of the gear case 16.
また、第２図に示すように、ギアケース１６内
には、略中央部に電動機３４がラツク軸２５と同
軸的に設けられている。電動機３４は、ギアケー
ス１６の内壁面に固着された界磁石３５と、この
界磁石３５とラツク軸２５との間に回転自在に配
設されたロータ３６とを備えている。ロータ３６
は一対の軸受３７ａ，３７ｂにより回転自在かつ
微小の軸方向変位を許容されてギアケース１６に
支持された円筒状の出力軸３８を有し、この出力
軸３８の外周にスキユー溝を有する積層鉄芯３９
および多重巻きされた電機子巻線４０が同軸かつ
一体に固着されている。この電機子巻線４０は出
力軸３８に固設された整流子４１および整流子４
１に弾接するブラシ４２を介し制御駆動回路２３
に接続されている。この電動機３４は、制御駆動
回路２３から電機子巻線４０に通電される電流値
に応じたトルク（操舵補助力）を発生する。 Further, as shown in FIG. 2, an electric motor 34 is provided within the gear case 16 approximately in the center thereof and coaxially with the rack shaft 25. As shown in FIG. The electric motor 34 includes a field magnet 35 fixed to the inner wall surface of the gear case 16, and a rotor 36 rotatably disposed between the field magnet 35 and the rack shaft 25. Rotor 36
has a cylindrical output shaft 38 supported by the gear case 16, which is rotatable and allowed minute axial displacement by a pair of bearings 37a and 37b, and has a skew groove on the outer periphery of the output shaft 38. Core 39
A multi-wound armature winding 40 is coaxially and integrally fixed. This armature winding 40 includes a commutator 41 and a commutator 4 fixed to the output shaft 38.
1 through the control drive circuit 23 through the brush 42 that comes into elastic contact with the
It is connected to the. This electric motor 34 generates a torque (steering assist force) according to the current value applied to the armature winding 40 from the control drive circuit 23 .
さらに、ギアケース１６内には電動機３４と第
１のピニオンギア２４との間にピニオン軸４３が
軸受４４ａ，４４ｂによつて車体後方向へ向かつ
て回転自在に支持され、このピニオン軸４３に固
設された第２のピニオンギア４５がラツク軸２５
に形成された前述の第２のラツク歯２５ｂと噛合
している。ピニオン軸４３は、回転中心軸が電動
機３４の出力軸３８の回転中心軸と平行でなくか
つ交わらない位置に配置され、食違い歯車機構
（skew bevel gear）４６を介して電動機３４の
出力軸３８に連結し、第１図に示すように、後輪
操舵機構１９に自在継手４７、連結軸１８および
自在継手４８を介し連結している。 Furthermore, a pinion shaft 43 is rotatably supported in the gear case 16 between the electric motor 34 and the first pinion gear 24 by bearings 44a and 44b toward the rear of the vehicle body, and is fixed to the pinion shaft 43. The provided second pinion gear 45 is connected to the rack shaft 25.
It meshes with the aforementioned second rack tooth 25b formed in the. The pinion shaft 43 is disposed in a position where its rotational center axis is not parallel to and does not intersect with the rotational center axis of the output shaft 38 of the electric motor 34 , and the pinion shaft 43 is connected to the output shaft 38 of the electric motor 34 via a skew bevel gear 46 . As shown in FIG. 1, it is connected to the rear wheel steering mechanism 19 via a universal joint 47, a connecting shaft 18, and a universal joint 48.
食違い歯車機構４６は、電動機３４の出力軸３
８の左端に一体に固設された第１の食違いかさ歯
車４９と、ピニオン軸４３に固設されて第１の食
違いかさ歯車４９と噛合する第２の食違いかさ歯
車５０とを有している。これら食違いかさ歯車４
９，５０は、周知のように、回転双曲面の一部を
ピツチ面として歯すじが母線の方向に形成されて
いる。なお、５１は第１の食違いかさ歯車４９の
電動機３４側端面と軸受３７ｂのインナレスとの
間に縮装されたスプリングであり、このスプリン
グ５１は第１の食違いかさ歯車４９を第２の食違
いかさ歯車５０に押圧してバツクラツシユを除去
する。 The staggered gear mechanism 46 is connected to the output shaft 3 of the electric motor 34.
8, and a second staggered bevel gear 50 that is fixed to the pinion shaft 43 and meshes with the first staggered bevel gear 49. are doing. These misaligned bevel gears 4
As is well known, teeth 9 and 50 have tooth traces formed in the direction of the generatrix using a part of a rotational hyperboloid as a pitch surface. Note that 51 is a spring compressed between the end surface of the first staggered bevel gear 49 on the motor 34 side and the inner ring of the bearing 37b, and this spring 51 connects the first staggered bevel gear 49 to the second staggered bevel gear 49. Press against the staggered bevel gear 50 to remove bumps.
後輪操舵機構１９は、第１図に示すように、ギ
アケース５２から前方へ向かつて回転自在に突出
した入力軸５３が前述の連結軸１８と自在継手４
８を介して連結し、この入力軸５３に内部の歯車
機構等を介し連結したタイロツド５４Ｌ，５４Ｒ
がそれぞれギアケース５２の左右から突出してい
る。これらタイロツド５４Ｌ，５４Ｒはそれぞれ
左右の後輪３１RL、３１RRのナツクルアーム３
２RL、３２RRにボールジヨイント５５Ｌ，５５
Ｒを介して連結している。なお、３３RL，３３
RRはダストブーツである。 In the rear wheel steering mechanism 19, as shown in FIG.
Tie rods 54L and 54R are connected to the input shaft 53 via an internal gear mechanism, etc.
protrude from the left and right sides of the gear case 52, respectively. These tie rods 54L and 54R are the knuckle arms 3 of the left and right rear wheels 31RL and 31RR, respectively.
Ball joints 55L and 55 on 2RL and 32RR
They are connected via R. In addition, 33RL, 33
RR is dust boots.
このような前後輪操舵車両の電動パワーステア
リング装置は、トルクセンサおよび車速センサ２
１等の出力信号に基づいて制御駆動回路２３がバ
ツテリ２２から電動機３４へ通電される電流を制
御し、電動機３４に操舵力等に応じた操舵補助力
を発生させる。そして、この電動機３４が発生す
る操舵補助力は、食違い歯車機構４６、第２のピ
ニオンギア４５および第２のラツク歯２５ｂを経
てラツク軸２５に伝達され、操向ハンドル１１か
らステアリング軸１２、第１のピニオンギア２４
および第１のラツク歯２５ａ等を経てラツク軸２
５に伝達される手動操舵力とともにタイロツド２
９Ｒ，２９Ｌ等を介し前輪３１FR，３１FLへ伝
達されて前輪３１FR，３１FLを転舵し、また、
ピニオン軸４３から連結軸１８を経て後輪用の操
舵機構１９へ伝達され、この操舵機構１９からタ
イロツド５４Ｌ，５４Ｒ等を介し後輪３１RL，
３１RRに伝達されて後輪３１RL，３１RRを転
舵する。そして、周知のように、この後輪３１
RL，３１RRの転舵方向および転舵角の前輪３１
FL，３１FRの転舵角に対する比率を後輪用の操
舵機構１９のギアケース５２内に収納された電気
的手段等によつて車速等に基き制御し、良好な旋
回性能を得る。 Such an electric power steering device for a vehicle with front and rear wheel steering includes a torque sensor and a vehicle speed sensor 2.
The control drive circuit 23 controls the current flowing from the battery 22 to the electric motor 34 based on the output signal such as No. 1, and causes the electric motor 34 to generate a steering assist force corresponding to the steering force or the like. The steering assist force generated by the electric motor 34 is transmitted to the rack shaft 25 via the staggered gear mechanism 46, the second pinion gear 45, and the second rack teeth 25b, and is transmitted from the steering handle 11 to the steering shaft 12, First pinion gear 24
and the rack shaft 2 via the first rack teeth 25a, etc.
Tie rod 2 along with the manual steering force transmitted to
It is transmitted to the front wheels 31FR, 31FL via 9R, 29L, etc., and steers the front wheels 31FR, 31FL.
It is transmitted from the pinion shaft 43 to the rear wheel steering mechanism 19 via the connecting shaft 18, and from this steering mechanism 19 to the rear wheels 31RL, 31RL, etc. via tie rods 54L, 54R, etc.
The signal is transmitted to 31RR and steers the rear wheels 31RL and 31RR. And, as is well known, this rear wheel 31
Front wheel 31 of steering direction and steering angle of RL, 31RR
The ratio of FL and 31FR to the steering angle is controlled based on the vehicle speed etc. by electrical means housed in the gear case 52 of the rear wheel steering mechanism 19 to obtain good turning performance.
一方、この前後輪操舵車両の電動パワーステア
リング装置は、電動機３４をラツク軸２５と同軸
状に配置するとともに、車幅方向略中央部にラツ
ク軸２５の第２のラツク歯２５ｂと噛合する第２
のピニオンギア４５が固設されたピニオン軸４３
を支持し、電動機３４の出力軸３８をピニオン軸
４３に食違い歯車機構４６を介し連結し、またピ
ニオン軸４３を連結軸１８によつて後輪用の操舵
機構１９すなわち後輪３１RL，３１RRに連結す
る。したがつて、全体としても小型化が図れ、ま
た、連結軸１８が車幅方向中央に位置して適正な
重量バランスが得られ、車室内空間等を活用する
ことができる。そして、この電動パワーステアリ
ング装置は、電動機３４が発生する操舵補助力を
食違い歯車機構４６、第２のピニオンギア４５お
よび第２のラツク歯２５ｂを介し伝達するため、
高精度加工が不可欠なボールスクリユ機構のボー
ルねじ溝等をラツク軸２５に形成する必要が無く
製造コストの低減が図れ、また、ラツク軸２５の
撓み等によつて伝達効率が影響を受けることも無
く円滑な作動を確保して高い信頼性が得られる。 On the other hand, in this electric power steering device for a vehicle with front and rear wheel steering, the electric motor 34 is disposed coaxially with the rack shaft 25, and a second rack tooth 25b of the rack shaft 25 is engaged with the second rack tooth 25b of the rack shaft 25 at a substantially central portion in the vehicle width direction.
A pinion shaft 43 to which a pinion gear 45 is fixedly attached.
The output shaft 38 of the electric motor 34 is connected to a pinion shaft 43 via a staggered gear mechanism 46, and the pinion shaft 43 is connected to a rear wheel steering mechanism 19, that is, rear wheels 31RL and 31RR, by a connecting shaft 18. Link. Therefore, the overall size of the vehicle can be reduced, and the connecting shaft 18 is located at the center in the width direction of the vehicle, resulting in an appropriate weight balance, and the interior space of the vehicle can be utilized. This electric power steering device transmits the steering assist force generated by the electric motor 34 via the staggered gear mechanism 46, the second pinion gear 45, and the second rack tooth 25b.
There is no need to form the ball screw groove of the ball screw mechanism, which requires high-precision machining, on the rack shaft 25, which reduces manufacturing costs, and the transmission efficiency is not affected by bending of the rack shaft 25, etc. Ensures smooth operation and high reliability.
（考案の効果）
以上説明したように、この考案にかかる前後輪
操舵車両の電動パワーステアリング装置によれ
ば、ラツク軸と同軸状に構成された電動機が発生
する操舵補助力を食違い歯車機構によつてピニオ
ン軸に伝達し、このピニオン軸に固設されたピニ
オンギアを前輪と連結したラツク軸のラツク歯に
噛合させて操舵補助力を前輪に伝達するとともに
ピニオン軸を後輪用の操舵機構と連結した連結軸
に結合して操舵補助力を後輪に伝達するため、小
型化が図れ、また、高精度加工が不可欠なボール
スクリユ機構のボールねじ溝等を形成する必要が
無く製造コストを低減でき、さらに、ラツク軸の
撓み等によつて伝達効率が影響を受けることも無
く高い信頼性が得られる。(Effects of the invention) As explained above, according to the electric power steering device for front and rear wheel steered vehicles according to this invention, the steering assist force generated by the electric motor configured coaxially with the rack shaft is applied to the staggered gear mechanism. The pinion gear fixed to this pinion shaft meshes with the rack teeth of the rack shaft connected to the front wheels to transmit the steering assist force to the front wheels, and the pinion shaft is used as a steering mechanism for the rear wheels. Since the steering assist force is transmitted to the rear wheels by connecting to the connecting shaft connected to the rear wheel, it is possible to achieve miniaturization, and there is no need to form the ball screw groove of the ball screw mechanism, which requires high precision machining, reducing manufacturing costs. Furthermore, the transmission efficiency is not affected by the deflection of the rack shaft, and high reliability can be obtained.
第１図および第２図はこの考案の一実施例にか
かる前後輪操舵車両の電動パワーステアリング装
置を示し、第１図が全体平面図、第２図が要部断
面図である。
１１……操向ハンドル、１７……前輪操舵機
構、１８……連結軸、１９……後輪操舵機構、２
３……制御駆動回路、２４……第１のピニオンギ
ア、２５……ラツク軸、２５ａ……第１のラツク
歯、２５ｂ……第２のラツク歯、３４……電動
機、４３……ピニオン軸、４５……第１のピニオ
ンギア、４６……食違い歯車機構、４９……第１
の食違いかさ歯車、５０……第２の食違いかさ歯
車。
1 and 2 show an electric power steering device for a front and rear wheel steered vehicle according to an embodiment of this invention, with FIG. 1 being an overall plan view and FIG. 2 being a sectional view of a main part. 11...Steering handle, 17...Front wheel steering mechanism, 18...Connection shaft, 19...Rear wheel steering mechanism, 2
3... Control drive circuit, 24... First pinion gear, 25... Rack shaft, 25a... First rack teeth, 25b... Second rack teeth, 34... Electric motor, 43... Pinion shaft , 45...first pinion gear, 46...staggered gear mechanism, 49...first
staggered bevel gears, 50...second staggered bevel gears.
Claims (1)
該第１のピニオンが噛合する第１のラツク歯を有
し前輪に連結されたラツク軸と、該ラツク軸を軸
方向摺動可能に支持するとともに前記第１のピニ
オンを回転自在に支持するギアハウジングと、該
ギアハウジング内に前記ラツク軸と同軸的に配置
されて該ラツク軸に操舵補助力を付与する電動機
と、後輪に転舵可能に連結された後輪操舵機構
と、該後輪操舵機構と前記ラツク軸とを連結する
連結軸と、を備えた前後輪操舵車両の電動パワー
ステアリング装置において、 前記ラツク軸に第２のラツク歯を形成するとと
もに、該第２のラツク歯と噛合する第２のピニオ
ンを前記ギアハウジングに回転自在に設け、該第
２のピニオンを前記連結軸と結合するとともに食
違い歯車機構を介して前記電動機に連結したこと
を特徴とする前後輪操舵車両の電動パワーステア
リング装置。[Claims for Utility Model Registration] A first pinion connected to a steering handle;
a rack shaft connected to a front wheel and having first rack teeth with which the first pinion meshes; and a gear that supports the rack shaft slidably in the axial direction and rotatably supports the first pinion. a housing, an electric motor disposed coaxially with the rack shaft in the gear housing and applying a steering assist force to the rack shaft, a rear wheel steering mechanism connected to the rear wheels so as to be steerable, and the rear wheels. In an electric power steering device for a front and rear wheel steered vehicle, comprising a connecting shaft connecting a steering mechanism and the rack shaft, second rack teeth are formed on the rack shaft and mesh with the second rack teeth. A front and rear wheel steered vehicle characterized in that a second pinion is rotatably provided in the gear housing, and the second pinion is coupled to the connection shaft and connected to the electric motor via a staggered gear mechanism. Electric power steering device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987016478U JPH0537742Y2 (en) | 1987-02-06 | 1987-02-06 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987016478U JPH0537742Y2 (en) | 1987-02-06 | 1987-02-06 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63124569U JPS63124569U (en) | 1988-08-15 |
| JPH0537742Y2 true JPH0537742Y2 (en) | 1993-09-24 |
Family
ID=30808369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987016478U Expired - Lifetime JPH0537742Y2 (en) | 1987-02-06 | 1987-02-06 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0537742Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54102727A (en) * | 1977-10-19 | 1979-08-13 | Zahnradfabrik Friedrichshafen | Servoosteering device for automobile |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6188872U (en) * | 1984-11-16 | 1986-06-10 |
-
1987
- 1987-02-06 JP JP1987016478U patent/JPH0537742Y2/ja not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54102727A (en) * | 1977-10-19 | 1979-08-13 | Zahnradfabrik Friedrichshafen | Servoosteering device for automobile |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63124569U (en) | 1988-08-15 |
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