JPH0687457A - Rack and pinion hydraulic power steering system - Google Patents
Rack and pinion hydraulic power steering systemInfo
- Publication number
- JPH0687457A JPH0687457A JP26797492A JP26797492A JPH0687457A JP H0687457 A JPH0687457 A JP H0687457A JP 26797492 A JP26797492 A JP 26797492A JP 26797492 A JP26797492 A JP 26797492A JP H0687457 A JPH0687457 A JP H0687457A
- Authority
- JP
- Japan
- Prior art keywords
- rack
- pinion
- tooth bottom
- tooth
- oil chamber
- 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
Landscapes
- Power Steering Mechanism (AREA)
Abstract
(57)【要約】
【構成】 ラック３とピニオンとを覆うハウジングの各
端から突出するラックを覆う一対の伸縮カバーの内部
を、ラック３に軸線方向に沿って形成された軸方向孔１
２と、その軸方向孔１２に交差すると共に油室とピニオ
ンとの間に位置する径方向孔１３とにより連通する。ラ
ック３の歯底面２ａが一端から他端に向かうに従い油室
から離反するように、ラック３の歯筋方向がラック軸線
に対し傾斜する。その径方向孔１３と歯底面２ａとの間
の歯底面２ａに直交する方向における距離が、歯底面２
ａの一端２ａ′において他端２ａ″よりも大きくなるよ
うに、径方向孔１３の中心方向が歯底面２ａに対し傾斜
する。
【効果】 軸方向孔と径方向孔とを、ラックの強度を低
下させることなくラックの歯に可及的近接して配置で
き、ラックピニオン式油圧パワーステアリング装置の小
型軽量化を図れる。
(57) [Summary] [Structure] The inside of a pair of expansion and contraction covers that cover the racks that project from each end of the housing that covers the rack 3 and the pinion is provided with an axial hole 1 formed in the rack 3 along the axial direction.
2 and a radial hole 13 that intersects the axial hole 12 and is located between the oil chamber and the pinion. The tooth trace direction of the rack 3 is inclined with respect to the rack axis so that the tooth bottom surface 2a of the rack 3 moves away from the oil chamber from one end to the other end. The distance between the radial hole 13 and the tooth bottom surface 2a in the direction orthogonal to the tooth bottom surface 2a is the tooth bottom surface 2
The central direction of the radial hole 13 is inclined with respect to the tooth bottom surface 2a so that the one end 2a 'of the a is larger than the other end 2a ". The rack and pinion type hydraulic power steering device can be arranged as close as possible to the teeth of the rack without lowering it, and the size and weight of the rack and pinion hydraulic power steering device can be reduced.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ハウジングの両端から
突出するラックを伸縮カバーにより覆っているラックピ
ニオン式油圧パワーステアリング装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rack and pinion type hydraulic power steering device in which a rack projecting from both ends of a housing is covered with a telescopic cover.
【０００２】[0002]
【従来の技術】図７に示すラックピニオン式油圧パワー
ステアリング装置１０１は、複数の歯１０２が形成され
ているラック１０３と、その歯１０２に噛み合うピニオ
ン１０４と、そのラック１０３とピニオン１０４とを覆
うハウジング１０５と、そのラック１０３の外周とハウ
ジング１０５の内周の間に形成された油室１０６とを備
える。そのハウジング１０５の各端から突出するラック
１０３に操舵用車輪が連結され、操向操作によるピニオ
ン１０４の回転によってラック１０３が軸線方向に移動
することで車両の操舵がなされ、その油室１０６を仕切
るピストン１０８に作用する油圧により操舵補助力が発
生する。そのハウジング１０５の各端から突出するラッ
ク１０３を伸縮カバー１１３、１１４により覆うこと
で、ハウジング１０５内への異物等の侵入を防止する。
そのラック１０３に軸線方向に沿って形成された軸方向
孔１１０と、この軸方向孔１１０に交差すると共に油室
１０６とピニオン１０４との間に位置する径方向孔１１
１と、油室１０６の他方側に位置する径方向孔１１２と
により、一方の伸縮カバー１１３の内部と他方の伸縮カ
バー１１４の内部とを連通し、これにより、ラック１０
３の移動時に伸縮カバー１１３、１１４の内部の空気を
一方から他方に移動させ、ラック１０３の移動が阻止さ
れるのを防止している。2. Description of the Related Art A rack and pinion type hydraulic power steering apparatus 101 shown in FIG. 7 covers a rack 103 having a plurality of teeth 102, a pinion 104 meshing with the teeth 102, and the rack 103 and the pinion 104. A housing 105 and an oil chamber 106 formed between the outer circumference of the rack 103 and the inner circumference of the housing 105 are provided. Steering wheels are connected to the rack 103 protruding from each end of the housing 105, and the rack 103 is moved in the axial direction by the rotation of the pinion 104 by the steering operation to steer the vehicle to partition the oil chamber 106. A steering assist force is generated by the hydraulic pressure acting on the piston 108. By covering the rack 103 projecting from each end of the housing 105 with the telescopic covers 113 and 114, foreign matter and the like can be prevented from entering the housing 105.
An axial hole 110 formed in the rack 103 along the axial direction, and a radial hole 11 that intersects the axial hole 110 and is located between the oil chamber 106 and the pinion 104.
1 and the radial hole 112 located on the other side of the oil chamber 106 communicates the inside of the one expandable cover 113 and the inside of the other expandable cover 114, and thereby the rack 10
The air inside the elastic covers 113 and 114 is moved from one side to the other side when the rack 3 is moved to prevent the movement of the rack 103 from being blocked.
【０００３】上記軸方向孔１１０がラック１０３の歯１
０２と径方向に関し完全に重合すると、ラック１０３の
歯底面１０２ａと軸方向孔１１０との間の肉厚が薄くな
ってラック１０３の強度が低下する。また、上記油室１
０６とピニオン１０４の間に位置する径方向孔１１１
は、ラック１０３の移動時に油室１０６内に入り込まな
い位置に配置する必要があることから、径方向孔１１１
を歯１０２に近接して配置する程にラック１０３の軸長
を短くでき、ステアリング装置１０１を小型軽量化する
上で望ましい。そのため、その軸方向孔１１０の先端
と、油室１０６とピニオン１０４の間に位置する径方向
孔１１１は、可及的に歯１０２の近傍に設けられてい
る。The axial hole 110 is the tooth 1 of the rack 103.
02, the wall thickness between the tooth bottom surface 102a of the rack 103 and the axial hole 110 becomes thin, and the strength of the rack 103 decreases. In addition, the oil chamber 1
Radial hole 111 located between 06 and pinion 104
Needs to be arranged at a position where the rack 103 does not enter the oil chamber 106 when the rack 103 is moved.
The closer to the teeth 102, the shorter the axial length of the rack 103 can be, which is desirable in reducing the size and weight of the steering device 101. Therefore, the tip of the axial hole 110 and the radial hole 111 located between the oil chamber 106 and the pinion 104 are provided as close to the teeth 102 as possible.
【０００４】[0004]
【発明が解決しようとする課題】しかし、軸方向孔１１
０と歯１０２とが径方向に関し完全に重合しない場合で
も、部分的に重合するほどに軸方向孔１１０の先端と径
方向孔１１１を歯１０２の近傍に配置すると、図５に示
すように、最も油室１０６側に位置する歯底面１０２ａ
と径方向孔１１１との間の肉厚Ｔ１が小さくなり、ま
た、図６に示すように、その歯底面１０２ａと軸方向孔
１１０の先端との間の肉厚Ｔ２が小さくなり、ラック１
０３の強度が低下する。そのため、例えばラック１０３
に歯１０２の高周波焼入れ後に歪み取りのため曲げ荷重
を作用させるような場合、その肉厚減少部にクラックが
発生するおそれがある。However, the axial hole 11
0 and the tooth 102 do not completely overlap in the radial direction, if the tip of the axial hole 110 and the radial hole 111 are arranged near the tooth 102 so that they partially overlap, as shown in FIG. The tooth bottom surface 102a located closest to the oil chamber 106 side
The wall thickness T1 between the radial hole 111 and the radial hole 111 becomes small, and as shown in FIG. 6, the wall thickness T2 between the tooth bottom surface 102a and the tip of the axial hole 110 becomes small.
The strength of No. 03 decreases. Therefore, for example, the rack 103
When a bending load is applied to the teeth 102 to remove strain after induction hardening, cracks may occur at the reduced thickness portion.
【０００５】本発明は上記従来技術の問題を解決するこ
とのできるラックピニオン式油圧パワーステアリング装
置を提供することを目的とする。An object of the present invention is to provide a rack and pinion type hydraulic power steering system which can solve the above-mentioned problems of the prior art.
【０００６】[0006]
【課題を解決するための手段】本件第１の発明の特徴と
するところは、複数の歯が形成されているラックと、そ
の歯に噛み合うピニオンと、そのラックとピニオンとを
覆うハウジングと、そのラックの外周とハウジングの内
周の間に形成された油室と、そのハウジングの各端から
突出するラックを覆う伸縮カバーと、ラックに軸線方向
に沿って形成された軸方向孔と、その軸方向孔に交差す
ると共に油室とピニオンとの間に位置する径方向孔とを
備え、その軸方向孔と径方向孔とを介し一方の伸縮カバ
ーの内部と他方の伸縮カバーの内部とが連通するラック
ピニオン式油圧パワーステアリング装置において、ラッ
クの歯底面が一端から他端に向かうに従い油室から離反
するように、ラックの歯筋方向がラック軸線に対し傾斜
し、その径方向孔とラックの歯底面との間の歯底面に直
交する方向における距離が、歯底面の一端において他端
よりも大きくなるように、径方向孔の中心方向が歯底面
に対し傾斜する点にある。The first aspect of the present invention is characterized in that a rack having a plurality of teeth, a pinion meshing with the teeth, a housing for covering the rack and the pinion, and An oil chamber formed between the outer periphery of the rack and the inner periphery of the housing, an extendable cover that covers the rack protruding from each end of the housing, an axial hole formed along the axial direction of the rack, and its axis. A radial hole that intersects the direction hole and is located between the oil chamber and the pinion is provided, and the inside of one expansion cover and the inside of the other expansion cover communicate with each other through the axial hole and the radial hole. In the rack and pinion type hydraulic power steering device, the tooth trace direction of the rack is inclined with respect to the rack axis so that the tooth bottom surface of the rack moves away from the oil chamber from one end to the other end, and Distance in a direction perpendicular to the bottom land between the teeth bottom of the rack, so that greater than the other at one end of the root surface, lies in the center direction of the radial hole is inclined with respect to root surface.
【０００７】本件第２の発明の特徴とするところは、複
数の歯が形成されているラックと、その歯に噛み合うピ
ニオンと、そのラックとピニオンとを覆うハウジング
と、そのラックの外周とハウジングの内周の間に形成さ
れた油室と、そのハウジングの各端から突出するラック
を覆う伸縮カバーと、ラックに軸線方向に沿って形成さ
れた軸方向孔と、その軸方向孔に交差すると共に油室と
ピニオンとの間に位置する径方向孔とを備え、その軸方
向孔と径方向孔とを介し一方の伸縮カバーの内部と他方
の伸縮カバーの内部とが連通するラックピニオン式油圧
パワーステアリング装置において、最も油室側に位置す
るラックの歯底面の歯先からの深さが、各歯の間におけ
る歯底面の歯先からの深さよりも浅い点にある。The second aspect of the present invention is characterized in that a rack formed with a plurality of teeth, a pinion that meshes with the teeth, a housing that covers the rack and the pinion, an outer periphery of the rack, and a housing. An oil chamber formed between the inner circumference, an elastic cover that covers the rack protruding from each end of the housing, an axial hole formed along the axial direction of the rack, and an axial hole that intersects the axial hole. A rack-and-pinion hydraulic power system including a radial hole located between the oil chamber and the pinion, and the inside of the one expansion cover and the other expansion cover communicate with each other through the axial hole and the radial hole. In the steering device, the depth of the bottom of the rack of the rack located closest to the oil chamber from the tip of the tooth is shallower than the depth of the bottom of the tooth between the teeth.
【０００８】[0008]
【作用】本件第１発明の構成によれば、油室とピニオン
との間に位置する径方向孔をラックの歯に可及的に近接
して配置した場合に、その径方向孔と最も油室側に位置
するラックの歯底面との間の肉厚を、従来よりも大きく
することができる。すなわち、従来にあっては図５に示
すように、その径方向孔１１１の中心方向は歯底面１０
２ａに対し平行とされていた。これに対し本件第１発明
の構成によれば、その径方向孔と歯底面との間の歯底面
に直交する方向における距離が、歯底面の一端において
他端よりも大きくなるように、径方向孔の中心方向が歯
底面に対し傾斜する。これにより、その径方向孔と最も
油室側に位置する歯底面の一端との間の肉厚を、従来よ
りも大きくすることができる。また、その径方向孔と歯
底面との間の歯底面に直交する方向における距離は、歯
底面の他端においては従来よりも小さくなるが、歯底面
は一端から他端に向かうに従い油室から離反するので、
その径方向孔と最も油室側に位置する歯底面の他端との
間の肉厚が、従来の最小肉厚よりも小さくなることはな
い。According to the structure of the first aspect of the present invention, when the radial hole located between the oil chamber and the pinion is arranged as close as possible to the teeth of the rack, the radial hole and the most oil It is possible to make the wall thickness between the rack located on the chamber side and the bottom surface of the rack larger than before. That is, in the prior art, as shown in FIG. 5, the center of the radial hole 111 is located at the tooth bottom surface 10.
It was supposed to be parallel to 2a. On the other hand, according to the configuration of the first aspect of the present invention, the distance between the radial hole and the tooth bottom surface in the direction orthogonal to the tooth bottom surface is larger at one end of the tooth bottom surface than at the other end in the radial direction. The center direction of the hole is inclined with respect to the tooth bottom surface. As a result, the wall thickness between the radial hole and one end of the tooth bottom surface located closest to the oil chamber can be made larger than before. Further, the distance between the radial hole and the tooth bottom surface in the direction orthogonal to the tooth bottom surface becomes smaller at the other end of the tooth bottom surface than in the conventional case, but the tooth bottom surface becomes closer to the other end from the oil chamber. Because they separate
The wall thickness between the radial hole and the other end of the tooth bottom surface located closest to the oil chamber does not become smaller than the conventional minimum wall thickness.
【０００９】本件第２発明の構成によれば、軸方向孔を
ラックの歯に可及的に近接して配置した場合に、その軸
方向孔と最も油室側における歯底面との間の肉厚を、従
来よりも大きくすることができる。すなわち、従来にあ
っては図６に示すように、歯底面１０２ａの歯先からの
深さは全て均一とされていた。これに対し本件第２発明
の構成によれば、最も油室側に位置する歯底面の歯先か
らの深さが、各歯の間における歯底面の歯先からの深さ
よりも浅くされているので、その軸方向孔と最も油室側
に位置する歯底面との間の肉厚を、従来よりも大きくす
ることができる。According to the structure of the second aspect of the present invention, when the axial hole is arranged as close as possible to the teeth of the rack, the flesh between the axial hole and the tooth bottom surface closest to the oil chamber is formed. The thickness can be made larger than before. That is, in the prior art, as shown in FIG. 6, the depth of the tooth bottom surface 102a from the tooth tip was all uniform. On the other hand, according to the configuration of the second aspect of the present invention, the depth of the tooth bottom located closest to the oil chamber from the tooth tip is shallower than the depth of the tooth bottom between the teeth from the tooth tip. Therefore, the wall thickness between the axial hole and the tooth bottom surface located closest to the oil chamber can be increased as compared with the conventional case.
【００１０】[0010]
【実施例】以下、図面を参照して本発明の実施例を説明
する。Embodiments of the present invention will be described below with reference to the drawings.
【００１１】図４に示すラックピニオン式油圧パワース
テアリング装置１は、複数の歯２が形成されているラッ
ク３と、その歯２に噛み合うピニオン４と、そのラック
３とピニオン４とを覆うハウジング５とを備えている。
そのピニオン４は入力軸１６を介し車両のハンドルに連
結される。そのラック３はハウジング５の両端から突出
し、一方の突出端に連結されるボールジョイント１８に
リンクを介し操舵用車輪が連結される。これにより、操
向操作によりピニオン４が回転してラック３が車両幅方
向に移動することで車両の操舵がなされる。The rack and pinion type hydraulic power steering apparatus 1 shown in FIG. 4 has a rack 3 having a plurality of teeth 2, a pinion 4 meshing with the teeth 2, and a housing 5 covering the rack 3 and the pinion 4. It has and.
The pinion 4 is connected to the steering wheel of the vehicle via an input shaft 16. The rack 3 projects from both ends of the housing 5, and a steering wheel is connected to a ball joint 18 connected to one projecting end via a link. As a result, the steering operation causes the pinion 4 to rotate and the rack 3 to move in the vehicle width direction, whereby the vehicle is steered.
【００１２】また、ラック３の外周とハウジング５の内
周の間をシールする一対のシール部材６、７が設けら
れ、両シール部材６、７の間が、ピストン８により仕切
られる一対の油室９ａ、９ｂとされている。その油室９
ａ、９ｂの一方に前記入力軸１６の外周に設けられたコ
ントロールバルブ１７を介し圧油が図外ポンプから供給
され、油室９ａ、９ｂの他方から油が図外タンクに還流
することで操舵補助力が発生する。Further, a pair of seal members 6 and 7 for sealing between the outer circumference of the rack 3 and the inner circumference of the housing 5 are provided, and a pair of oil chambers are partitioned by the piston 8 between the both seal members 6 and 7. 9a and 9b. The oil chamber 9
Pressure oil is supplied from a pump (not shown) through a control valve 17 provided on the outer circumference of the input shaft 16 to one of a and 9b, and oil is returned from the other of the oil chambers 9a and 9b to a tank (not shown) for steering. Auxiliary power is generated.
【００１３】そのハウジング５の各端から突出するラッ
ク３の両端は、それぞれ蛇腹状の伸縮カバー１０、１１
により覆われ、各伸縮カバー１０、１１の一端はハウジ
ング５に連結されると共に他端はラック３に連結され、
これによりハウジング５内部への泥水、異物、塵埃等の
侵入を防止している。そのラック３に軸線方向に沿って
形成された軸方向孔１２と、この軸方向孔１２に交差す
ると共に油室９ａ、９ｂとピニオン４との間に位置する
径方向孔１３と、油室９ａ、９ｂの他方側に位置する径
方向孔１４とにより、一方の伸縮カバー１０の内部と他
方の伸縮カバー１１の内部とを連通している。これによ
り、ラック３の移動時に各伸縮カバー１０、１１の内部
の空気を一方から他方に移動させ、ラック３の移動が阻
止されるのを防止している。Both ends of the rack 3 projecting from each end of the housing 5 have bellows-shaped expandable covers 10 and 11, respectively.
, One end of each expansion cover 10 and 11 is connected to the housing 5 and the other end is connected to the rack 3.
This prevents muddy water, foreign matter, dust, etc. from entering the housing 5. An axial hole 12 formed in the rack 3 along the axial direction, a radial hole 13 that intersects with the axial hole 12 and is located between the oil chambers 9a and 9b and the pinion 4, and an oil chamber 9a. , 9b and the radial hole 14 located on the other side of the elastic covers 9b, 9b so that the inside of one elastic cover 10 communicates with the inside of the other elastic cover 11. Thereby, when the rack 3 is moved, the air inside each of the expansion and contraction covers 10 and 11 is moved from one to the other to prevent the movement of the rack 3 from being blocked.
【００１４】図２に示すように、軸方向孔１２の先端
と、油室９ａ、９ｂとピニオン４との間に位置する径方
向孔１３は、可及的にラック３の歯２の近傍に設けられ
ている。すなわち、その軸方向孔１２の先端の小径部分
１２ａは、最も油室９ａ、９ｂ側に位置するラック３の
歯底面２ａと径方向に関し重合し、また、その径方向孔
１３は、その最も油室９ａ、９ｂ側に位置する歯底面２
ａの一端２ａ′と径方向に関し重合する。また、そのラ
ック３に形成された歯２の歯筋方向は、その歯底面２ａ
が一端２ａ′から他端２ａ″に向かうに従い油室９ａ、
９ｂから離反するように、ラック軸線に対し傾斜する。As shown in FIG. 2, the radial hole 13 located between the tip of the axial hole 12 and the oil chambers 9a, 9b and the pinion 4 is located as close to the teeth 2 of the rack 3 as possible. It is provided. That is, the small diameter portion 12a at the tip of the axial hole 12 overlaps with the tooth bottom surface 2a of the rack 3 located closest to the oil chambers 9a and 9b in the radial direction, and the radial hole 13 has the most oil portion. The tooth bottom surface 2 located on the chamber 9a, 9b side
It is superposed with one end 2a 'of a in the radial direction. In addition, the tooth trace direction of the tooth 2 formed on the rack 3 is the tooth bottom surface 2a.
From the one end 2a 'to the other end 2a ", the oil chamber 9a,
It inclines with respect to a rack axis so that it may separate from 9b.
【００１５】図１に示すように、油室９ａ、９ｂとピニ
オン４との間に位置する径方向孔１３の中心方向は歯底
面２ａに対し傾斜し、これにより、その径方向孔１３と
歯底面２ａとの間の歯底面２ａに直交する方向における
距離は、歯底面２ａの一端２ａ′における距離Ｌａが歯
底面２ａの他端２ａ″における距離Ｌｂよりも大きくさ
れている。また、図３に示すように、最も油室９ａ、９
ｂ側に位置する歯底面２ａの歯先からの深さＤ１は、各
歯２の間における歯底面２ａの歯先からの深さＤ２より
も浅くされている。As shown in FIG. 1, the center of the radial hole 13 located between the oil chambers 9a, 9b and the pinion 4 is inclined with respect to the tooth bottom surface 2a, so that the radial hole 13 and the tooth The distance from the bottom surface 2a in the direction orthogonal to the tooth bottom surface 2a is set such that the distance La at one end 2a 'of the tooth bottom surface 2a is larger than the distance Lb at the other end 2a "of the tooth bottom surface 2a. As shown in FIG.
The depth D1 from the tooth tip of the tooth bottom surface 2a located on the b side is shallower than the depth D2 from the tooth tip of the tooth bottom surface 2a between the teeth 2.
【００１６】上記構成によれば、径方向孔１３の中心方
向が歯底面２ａに対し傾斜し、油室９ａ、９ｂとピニオ
ン４との間に位置する径方向孔１３と歯底面２ａとの間
の歯底面２ａに直交する方向における距離は、歯底面２
ａの一端２ａ′における距離Ｌａのほうが他端２ａ″に
おける距離Ｌｂよりも大きいので、その径方向孔１３と
最も油室９ａ、９ｂ側に位置するラック３の歯底面２ａ
の一端２ａ′との間の肉厚を、従来のように径方向孔１
１１の中心方向が歯底面１０２ａに対し平行な場合より
も大きくすることができる。また、その径方向孔１３と
歯底面２ａの他端２ａ″との間の歯底面２ａに直交する
方向における距離Ｌｂは、従来のように径方向孔１１１
の中心方向が歯底面１０２ａに対し平行な場合よりも小
さくなるが、ラック３の歯底面２ａは一端２ａ′から他
端２ａ″に向かうに従い油室９ａ、９ｂから離反するの
で、その径方向孔１３と最も油室９ａ、９ｂ側に位置す
る歯底面２ａの他端２ａ″との間の肉厚が、従来の最小
肉厚よりも小さくなることはない。According to the above-mentioned structure, the center of the radial hole 13 is inclined with respect to the tooth bottom surface 2a, and between the radial hole 13 and the tooth bottom surface 2a located between the oil chambers 9a, 9b and the pinion 4. The distance in the direction orthogonal to the tooth bottom surface 2a is
Since the distance La at one end 2a 'of a is larger than the distance Lb at the other end 2a ", the radial hole 13 and the tooth bottom surface 2a of the rack 3 located closest to the oil chambers 9a, 9b are located.
The thickness between one end 2a 'of the radial hole 1
It can be made larger than when the center direction of 11 is parallel to the tooth bottom surface 102a. Further, the distance Lb between the radial hole 13 and the other end 2a ″ of the tooth bottom surface 2a in the direction orthogonal to the tooth bottom surface 2a is the same as in the conventional case.
Although the center direction of the rack is smaller than that in the case where it is parallel to the tooth bottom surface 102a, the tooth bottom surface 2a of the rack 3 separates from the oil chambers 9a and 9b as it goes from the one end 2a 'to the other end 2a ". The wall thickness between 13 and the other end 2a ″ of the tooth bottom surface 2a located closest to the oil chambers 9a, 9b does not become smaller than the conventional minimum wall thickness.
【００１７】また、上記構成によれば、最も油室９ａ、
９ｂ側に位置する歯底面２ａの歯先からの深さＤ１が、
ラック３の各歯２の間における歯底面２ａの歯先からの
深さＤ２よりも浅くされているので、軸方向孔１２と最
も油室９ａ、９ｂ側に位置する歯底面２ａとの間の肉厚
Ｔａを、従来よりも大きくすることができる。Further, according to the above configuration, the most oil chamber 9a,
The depth D1 from the tip of the tooth bottom surface 2a located on the 9b side is
Since it is shallower than the depth D2 from the tip of the tooth bottom surface 2a between the teeth 2 of the rack 3, the gap between the axial hole 12 and the tooth bottom surface 2a located closest to the oil chambers 9a, 9b is determined. The wall thickness Ta can be made larger than before.
【００１８】なお、本発明は上記実施例に限定されるも
のではない。例えば、ラックの両端にボールジョイント
を介し操舵用車輪を連結するラックピニオン式油圧パワ
ーステアリング装置にも本発明を適用できる。The present invention is not limited to the above embodiment. For example, the present invention can be applied to a rack and pinion type hydraulic power steering device in which steering wheels are connected to both ends of a rack through ball joints.
【００１９】[0019]
【発明の効果】本発明によれば、ラックの両端を覆う一
対の伸縮カバーの内部を連通する軸方向孔と径方向孔と
を、ラックの強度を低下させることなくラックの歯に可
及的近接して配置することができ、ラックピニオン式油
圧パワーステアリング装置の小型軽量化を図ることがで
きる。According to the present invention, the axial hole and the radial hole that communicate with the inside of the pair of expandable covers that cover both ends of the rack are connected to the teeth of the rack as much as possible without reducing the strength of the rack. The rack and pinion type hydraulic power steering devices can be arranged close to each other, and the size and weight of the rack and pinion hydraulic power steering device can be reduced.
【図１】本発明の実施例のラックの横断面図（図２のＩ
‐Ｉ線断面図）FIG. 1 is a cross-sectional view of a rack according to an embodiment of the present invention (I in FIG. 2).
-I line cross section)
【図２】本発明の実施例のラックの要部の正面図FIG. 2 is a front view of the main part of the rack according to the embodiment of the present invention.
【図３】本発明の実施例のラックの要部の縦断面図FIG. 3 is a vertical cross-sectional view of the main part of the rack according to the embodiment of the present invention.
【図４】本発明の実施例のラックピニオン式油圧パワー
ステアリング装置の断面図FIG. 4 is a sectional view of a rack and pinion type hydraulic power steering system according to an embodiment of the present invention.
【図５】従来のラックの横断面図FIG. 5 is a cross-sectional view of a conventional rack
【図６】従来のラックの縦断面図FIG. 6 is a vertical sectional view of a conventional rack.
【図７】従来のラックピニオン式油圧パワーステアリン
グ装置の断面図FIG. 7 is a sectional view of a conventional rack and pinion type hydraulic power steering device.
２ 歯 ２ａ 歯底面 ３ ラック ４ ピニオン ５ ハウジング ９ａ、９ｂ 油室 １０、１１ 伸縮カバー １２ 軸方向孔 １３ 径方向孔 2 teeth 2a tooth bottom surface 3 rack 4 pinion 5 housing 9a, 9b oil chamber 10, 11 expansion / contraction cover 12 axial hole 13 radial hole
Claims (2)
の歯に噛み合うピニオンと、そのラックとピニオンとを
覆うハウジングと、そのラックの外周とハウジングの内
周の間に形成された油室と、そのハウジングの各端から
突出するラックを覆う伸縮カバーと、ラックに軸線方向
に沿って形成された軸方向孔と、その軸方向孔に交差す
ると共に油室とピニオンとの間に位置する径方向孔とを
備え、その軸方向孔と径方向孔とを介し一方の伸縮カバ
ーの内部と他方の伸縮カバーの内部とが連通するラック
ピニオン式油圧パワーステアリング装置において、ラッ
クの歯底面が一端から他端に向かうに従い油室から離反
するように、ラックの歯筋方向がラック軸線に対し傾斜
し、その径方向孔とラックの歯底面との間の歯底面に直
交する方向における距離が、歯底面の一端において他端
よりも大きくなるように、径方向孔の中心方向が歯底面
に対し傾斜することを特徴とするラックピニオン式油圧
パワーステアリング装置。1. A rack having a plurality of teeth, a pinion meshing with the teeth, a housing covering the rack and the pinion, and an oil chamber formed between the outer periphery of the rack and the inner periphery of the housing. And an elastic cover that covers the rack protruding from each end of the housing, an axial hole formed along the rack in the axial direction, and an axial hole that intersects the axial hole and is located between the oil chamber and the pinion. In a rack and pinion type hydraulic power steering device in which a radial hole is provided, and the inside of one expandable cover and the inside of the other expandable cover communicate with each other through the axial hole and the radial hole, the tooth bottom surface of the rack is From the oil chamber toward the other end, the tooth trace direction of the rack is inclined with respect to the rack axis, and in the direction orthogonal to the tooth bottom surface between the radial hole and the tooth bottom surface of the rack. A rack and pinion type hydraulic power steering device, wherein the center direction of the radial hole is inclined with respect to the tooth bottom so that the distance becomes larger at one end of the tooth bottom than at the other end.
の歯に噛み合うピニオンと、そのラックとピニオンとを
覆うハウジングと、そのラックの外周とハウジングの内
周の間に形成された油室と、そのハウジングの各端から
突出するラックを覆う伸縮カバーと、ラックに軸線方向
に沿って形成された軸方向孔と、その軸方向孔に交差す
ると共に油室とピニオンとの間に位置する径方向孔とを
備え、その軸方向孔と径方向孔とを介し一方の伸縮カバ
ーの内部と他方の伸縮カバーの内部とが連通するラック
ピニオン式油圧パワーステアリング装置において、最も
油室側に位置するラックの歯底面の歯先からの深さが、
各歯の間における歯底面の歯先からの深さよりも浅いこ
とを特徴とするラックピニオン式油圧パワーステアリン
グ装置。2. A rack formed with a plurality of teeth, a pinion meshing with the teeth, a housing covering the rack and the pinion, and an oil chamber formed between the outer periphery of the rack and the inner periphery of the housing. And an elastic cover that covers the rack protruding from each end of the housing, an axial hole formed along the rack in the axial direction, and an axial hole that intersects the axial hole and is located between the oil chamber and the pinion. In the rack and pinion type hydraulic power steering device, which is provided with a radial hole, the inside of the one expansion cover and the inside of the other expansion cover communicate with each other through the axial hole and the radial hole, the position is closest to the oil chamber. The depth from the tip of the tooth bottom of the rack is
A rack and pinion type hydraulic power steering device characterized in that the bottom surface of each tooth is shallower than the depth from the tip of the tooth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26797492A JP3184333B2 (en) | 1992-09-09 | 1992-09-09 | Rack and pinion hydraulic power steering system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26797492A JP3184333B2 (en) | 1992-09-09 | 1992-09-09 | Rack and pinion hydraulic power steering system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0687457A true JPH0687457A (en) | 1994-03-29 |
| JP3184333B2 JP3184333B2 (en) | 2001-07-09 |
Family
ID=17452172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26797492A Expired - Fee Related JP3184333B2 (en) | 1992-09-09 | 1992-09-09 | Rack and pinion hydraulic power steering system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3184333B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2833554A1 (en) * | 2001-12-18 | 2003-06-20 | Soc Mecanique Irigny | Automobile rack steering comprises pinion meshing with rack, conduit in pinion and pinion tail creates communication allowing air circulation between steering inside and outside |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3118170U (en) | 2005-10-31 | 2006-01-26 | 令二 若生 | Suction prevention device for vacuum cleaner |
-
1992
- 1992-09-09 JP JP26797492A patent/JP3184333B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2833554A1 (en) * | 2001-12-18 | 2003-06-20 | Soc Mecanique Irigny | Automobile rack steering comprises pinion meshing with rack, conduit in pinion and pinion tail creates communication allowing air circulation between steering inside and outside |
| EP1325856A1 (en) * | 2001-12-18 | 2003-07-09 | Société de Mécanique d'Irigny | Rack pinion steering gear for automotive vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3184333B2 (en) | 2001-07-09 |
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