JP3739450B2 - Steering rack bar with screw shaft - Google Patents

Steering rack bar with screw shaft Download PDF

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Publication number
JP3739450B2
JP3739450B2 JP28880195A JP28880195A JP3739450B2 JP 3739450 B2 JP3739450 B2 JP 3739450B2 JP 28880195 A JP28880195 A JP 28880195A JP 28880195 A JP28880195 A JP 28880195A JP 3739450 B2 JP3739450 B2 JP 3739450B2
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Prior art keywords
rack
hollow
screw rod
screw
pipe material
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JPH09132151A (en
Inventor
村 正 信 中
田 寛 隆 梅
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ティーアールダブリュ オートモーティブ ジャパン株式会社
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
    • B21K1/767—Toothed racks
    • B21K1/768—Toothed racks hollow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D3/00—Steering gears
    • B62D3/02—Steering gears mechanical
    • B62D3/12—Steering gears mechanical of rack-and-pinion type
    • B62D3/126—Steering gears mechanical of rack-and-pinion type characterised by the rack

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Power Steering Mechanism (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は自動車のステアリング機構に使用されるネジ軸を備えたステアリング用ラックバーに関する。
【０００２】
【従来の技術】
一般に自動車のステアリング（操向）は、ハンドルを回転させることによりハンドル軸の軸端に固着されている歯車がこれと噛み合っているラックを移動させることにより回転を直線運動に変えて行うものであるが、ハンドルの手動操作だけでは相当な手応えとなるので従来からパワーステアリング方式と呼ばれるものが採用されている。
【０００３】
この構造には主に油圧式が用いられており、ハンドル軸（ステアリングシャフト）の回転によりエンジンにより駆動された油圧ポンプからの圧油をラック杆のピストン部へ及ばせてラックを動かすことによりハンドルを軽く回すことができるようになっている。
【０００４】
【発明が解決しようとする課題】
しかしながら油圧式では必ず油圧回路が必要であるために配管構造が複雑となり、組付性や高価格になる等の問題があり、同時にパワーステアリング系の駆動にエンジン馬力が必要なため、その分エンジンの出力が低下するという欠点があった。
【０００５】
【課題を解決するための手段】
本発明は、ハンドル軸の回転をギヤ伝達系を介して直線運動に変換し、車輪を操舵するためのラックバーにおいて、前記ギヤ伝達系と噛合するラック部のラック歯列の幅に対応する長さの平面部を有し、前記平面部にラック歯が形成されている中空ラック杆と、前記直線運動による動力の伝達を受けるための中空ネジ杆とを有し、前記中空ラック杆と前記中空ネジ杆が別部材からなり、前記中空ラック杆の一端と前記中空ネジ杆の他端をかしめまたは溶接により接合してなることを特徴とするものである。
また、本発明は、ハンドル軸の回転をギヤ伝達系を介して直線運動に変換し、車輪を操舵するためのラックバーにおいて、前記ギヤ伝達系と噛合するラック部のラック歯列の幅に対応する長さの平面部を有し、前記平面部にラック歯が形成されている中空ラック杆と、前記直線運動による動力の伝達を受けるためのネジ部を無空ねじ杆とを有し、前記中空ラック杆と前記無空ネジ杆が別部材からなり、前記中空ラック杆の一端と前記無空ネジ杆の他端をかしめまたは溶接により接合してなることを特徴とするものである。
さらに、本発明は、ハンドル軸の回転をギヤ伝達系を介して直線運動に変換し、車輪を操舵するためのラックバーにおいて、前記ギヤ伝達系と噛合するラック部のラック歯列の幅に対応する長さの平面部を有し、前記平面部にラック歯が形成されている無空ラック杆と、前記直線運動による動力の伝達を受けるためのネジ部を中空ねじ杆とを有し、前記無空ラック杆と前記中空ネジ杆が別部材からなり、前記無空ラック杆の一端と前記中空ネジ杆の他端をかしめまたは溶接により接合してなることを特徴とするものである。
【０００６】
また、本発明は、ギヤ伝達系と噛合するラック部を中空ラック杵と、直線運動による動力の伝達を受けるためのネジ部を有する中空ねじ杆とからなるネジ軸を備えたステアリング用ラックバーの製造方法において、第１のパイプ素材にラック歯列の幅に対応する長さの平面部を有する一次形成体を加工する工程と、内部にラック歯列に対応する凹凸部が形成された割型からなる成形用型内に納め、前記一次成形体にポンチを圧入して一次成形体の外周の肉を成形用型の凹凸部に圧入させて第１パイプ素材の外周にラック歯を成形する工程と、ねじ型を有する成形型内に、両端を予め拡径加工された第２のパイプ素材を納め、外形が漸増するマンドレルを前記第２パイプ素材に圧入することにより前記第２パイプ素材に外周にネジ部を形成する工程と、前記ラック歯の形成された第１パイプ素材と、ネジ部の形成された第２パイプ素材の両端部のうち、一方を凸、他方を凹として嵌合させてからかしめまたは溶接により接合する工程と、からなることを特徴とするものである。
【０００７】
【発明の実施の形態】
以下、本発明を図面に示す実施の形態を参照して説明する。
【０００８】
本発明にかかるステアリング用ラックバーは、図１に示すように中空材のラック部１Ａとネジ部１Ｂとからなるもので、上記ラック部１Ａにはステアリングシャフト３１に固定されたピニオン３２が噛合され、ネジ部１Ｂには電動モータにより駆動される例えばボールネジ機構３３（位置は固定）が設けられ、ステアリング操作時に前記ボールネジ機構３３が作動してラックバーをステアリング方向（図の矢印方向）へ移動させるものである。
【０００９】
以下図２乃至図５に示すラックバーのいずれにおいても図１の場合と全く同様にして用いられる。
【００１０】
図２は本発明の請求項２にかかるラックバーを具体化した請求項３の場合の斜視図を示すもので、ラックバー１は中空ラック杆２Ａからなるラック部１Ａと、別体の中空ネジ杆２Ｂからなるネジ部１Ｂとで構成され、両者は同一軸線上で隣り合うように一体に結合させたものてある。
【００１１】
図４は請求項２にかかるラックバーを具体化した請求項４の場合のラックバー２を示すもので、この場合ラック部１Ａは図２に示す中空ラック杆２Ａであり、ネジ部１Ｂは無空ネジ杆３Ｂとして、別材料により作り、出来たものを同一軸線上で隣り合うように一体に結合させたものである。
【００１２】
図５は請求項２にかかるラックバーを具体化した請求項５の場合のラックバー３を示すもので、ラック部１Ａを無空材から作った無空ラック杆３Ａとし、ネジ杆２Ｂを図２と同じ中空ネジ杆２Ｂとして一体に結合させたものである。
【００１３】
そして図２乃至図５の場合の結合は公知の手段によるもので、例えば両端面のうち、何れか一方を凸、他方を凹として嵌合させた後かしめによる結合、あるいは圧接溶接等の溶接による結合等で行う。
【００１４】
また上記のラック杆２Ａはパイプ材から形成されるもので、その製造方法は、例えば、図６乃至図１０に示すように、中空ラック杆２Ａの形成には左右対称をなす１対の半円筒状の第１次成形用割型１１，１２が使用される。両割型１１，１２の垂直をなす下部対向面１１ａ，１２ａ同士は互いに間隔なく当接し、かつ垂直をなす上部対向面１１ｂ，１２ｂは、得ようとするラックの歯列を幅と等しい間隔を持って、互いに側方に引き込んでいる。
各割型１１，１２の上下の対向面１１ｂ，１１ａ，１２ｂ，１２ａの間はパイプ材２ａ’の外側と接する凹状の円弧面１１ｃ，１２ｃとなっている。
【００１５】
そこで円弧面１１ｃ，１２ｃ内に、得ようとするラック杆２Ａの素材であるパイプ材２ａ’を弛みなく嵌合してから、両割型１１，１２を適宜の手段により結合する。つぎに上部対向面１１ｂ，１２ｂ面間に露出するパイプ材２ａ’の上面部２ｂを適宜の手段で加熱して軟化させる。
【００１６】
この状態において、両割型１１，１２の上部対向面１１ｂ，１２ｂ間に、得ようとするラックの歯列７形成部となる平面部４とほぼ等しい長さの角杆状プレス型１３を圧入してパイプ材２ａ’の上面部２ｂを平らにプレス加工する。
【００１７】
すると図７および図８に示すように、両端部は断面円形をなし、かつその間に、得ようとするラック杆２Ａの歯列７の幅と同幅で、所要の長さの平面部４を備える第１次成形体２ａが形成される。
【００１８】
なおこの際、第１次成形体２ａの上面部２ｂは加熱軟化されているから、形成された平面部４の裏側は中央部が厚肉の凸レンズ状の盛上がり状態となる。図中、５，６は第１次成形体２ａの両端部で円形断面をとなっている。
【００１９】
さらに図９および図１０に示すように、得ようとするラックと補形をなす左右１対の第２次成形用割型２１，２２を用意する。
【００２０】
これは両割型２１，２２とも半円筒状をなし、その対向面における凹入孔２１ａ，２２ａの上面は両端を除いて軸線と直交し、かつラックの歯列７と対応する凹凸部２１ｂ，２２ｂに形成されている。凹入孔２１ａ，２２ａの両端部は合体して第１次成形体２ａの両端部と等形等寸の円形部となるような半円形部２１ｃ，２２ｃとなっている。
【００２１】
ここで２３は欠円状をなすポンチで、その外形は第１次成形体２ａの非円形部の内形とほぼ等しく、かつその中心より上面である平面部２３ａまでの距離は、第１次成形体２ａの軸線より、その平面部４までの距離よりも大である。
【００２２】
平面部２３ａの前端部は前方に向って下傾する傾斜部２３ｃに形成されている。
【００２３】
ポンチ２３の前端面２３ｄは第１次成形体３ａの内面形と同形で、かつそれよりも僅かに小寸となっている。
【００２４】
この第２次成形用割型２１，２２内に第１次成形体２ａを嵌入するとともに、第２次成形用割型２１，２２を結合し、ついで第１次成形体２ａ内にその右端よりポンチ２３を強制的に圧入する。
【００２５】
するとポンチ２３の前端の傾斜部２３ｃにより、第１次成形体３ａの平面部４のみが押されて、その外周面の肉は、割型２１，２２の凹凸部２１ｂ，２２ｂに喰込み、塑性変形して歯列７が形成されることになる。
【００２６】
なお歯列７の形状および寸法は、これに噛合させるべきピニオン等を歯形に応じて定められる。
【００２７】
また中空ネジ杆３Ｂの成形については、種々の方法があるが、例えば図１１に示すように、割型２４ａ，２４ｂの合せ面に得ようとするネジ杆３Ｂのネジ山の半周ずつのネジ型２５，２５を有する成形用型２４内に、両端を予め拡径加工されたパイプ素材３ａを納め、上記成形用型２４内のパイプ素材３ａに、先端から外径がＤ1 ，Ｄ2 ，Ｄ3 のように漸増するマンドレル２６を油圧等の加圧手段により白矢印方向に圧入してパイプ素材３ａの外周の肉を成形用型２４内のネジ型２５，２５に圧入させてパイプ素材３ａの外周にネジ山を形成することによりネジ杆３Ｂを形成する方法による。この場合、マンドレル２６は、パイプ素材３ａの両端からそれぞれパイプ素材３ａの全長にわたり圧入することが好ましい。
このほかバルジ加工による成形、外周からの転造成形、またはこれらの組合せ等により行われ、外観では図２に示すもの、その軸方向断面については図３に示すように外周面にネジ８ａが形成される。
【００２８】
【発明の効果】
本発明は以上説明したように構成したから、ステアリング方式を電動式とする場合はバッテリ駆動となるからエンジン馬力の低下が防止されるラックバーを使用することができる。また、ラックバーの軽量化は請求項３に示すようにラック部、およびネジ部に中空パイプを使用することによりその目的を達成することができる。
【図面の簡単な説明】
【図１】本発明の請求項１にかかるステアリング用ラックバーおよびその作動原理を示す説明図。
【図２】本発明の請求項３にかかるステアリング用ラックバーを示す斜視図。
【図３】図２のＡ−Ａ断面図。
【図４】本発明の請求項４にかかるステアリング用ラックバーを示す斜視図。
【図５】本発明の請求項５にかかるステアリング用ラックバーを示す斜視図。
【図６】中空ラック杆の製造方法において、パイプを第１次成形用割型に嵌入して、成形を開始する直前の状態を示す縦断側面図。
【図７】同じく成形終了時の状態を示す縦断側面図。
【図８】同じく第１次成形体の斜視図。
【図９】同じく第１次成形体を第２次成形用割型内において、成形中の状態を示す中央縦断正面図。
【図１０】図９のＢ−Ｂ断面図。
【図１１】請求項６にかかる中空ネジ杆の製造方法を示す断面図。
【符号の説明】
１ ラックバー
１Ａ ラック部
１Ｂ ネジ部
２ ラックバー
２Ａ ラック杆
２Ｂ ネジ杆
３ ラックバー
３Ａ ラック杆
３Ｂ ネジ杆
３１ ステアリングシャフト
３２ ピニオン
３３ ボールネジ機構[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a steering rack bar having a screw shaft used in a steering mechanism of an automobile.
[0002]
[Prior art]
Generally, steering (steering) of an automobile is performed by changing a rotation to a linear motion by moving a rack meshed with a gear fixed to the shaft end of the handle shaft by rotating the handle. However, since only a manual operation of the steering wheel provides a considerable response, a so-called power steering system has been conventionally employed.
[0003]
This structure is mainly hydraulic, and the handle is moved by moving the rack by applying pressure oil from the hydraulic pump driven by the engine to the piston part of the rack by rotating the handle shaft (steering shaft). Can be turned lightly.
[0004]
[Problems to be solved by the invention]
However, since the hydraulic circuit always requires a hydraulic circuit, the piping structure is complicated, and there are problems such as ease of assembly and high price. At the same time, engine horsepower is required to drive the power steering system. There was a drawback in that the output of was reduced.
[0005]
[Means for Solving the Problems]
The present invention converts a rotation of a handle shaft into a linear motion via a gear transmission system, and in a rack bar for steering a wheel, a length corresponding to the width of a rack tooth row of a rack portion meshing with the gear transmission system. A hollow rack rod having a flat surface portion and rack teeth formed on the flat surface portion, and a hollow screw rod for receiving power transmitted by the linear motion, the hollow rack rod and the hollow The screw rod is made of a separate member, and one end of the hollow rack rod and the other end of the hollow screw rod are joined by caulking or welding .
Further, the present invention converts the rotation of the handle shaft into a linear motion through the gear transmission system, and corresponds to the width of the rack tooth row of the rack portion meshing with the gear transmission system in the rack bar for steering the wheel. A hollow rack rod having a flat portion with a length to be formed and rack teeth formed on the plane portion, and a non-threaded screw rod having a screw portion for receiving power transmission by the linear motion, The hollow rack cage and the empty screw rod are made of different members, and one end of the hollow rack cage and the other end of the empty screw rod are joined by caulking or welding .
Furthermore, the present invention converts the rotation of the handle shaft into a linear motion via a gear transmission system, and corresponds to the width of the rack tooth row of the rack portion meshing with the gear transmission system in a rack bar for steering a wheel. A non-empty rack cage having a planar portion with a rack tooth formed on the plane portion, and a hollow screw rod for receiving a power transmission by the linear motion, The empty rack rod and the hollow screw rod are made of different members, and one end of the empty rack rod and the other end of the hollow screw rod are joined by caulking or welding .
[0006]
Further, the present invention provides a steering rack bar having a screw shaft including a hollow rack rod having a rack portion meshing with a gear transmission system and a hollow screw rod having a screw portion for receiving power transmission by linear motion. In the manufacturing method, a step of processing a primary formed body having a planar portion having a length corresponding to the width of the rack tooth row on the first pipe material, and a split mold in which concave and convex portions corresponding to the rack tooth row are formed inside And forming a rack tooth on the outer periphery of the first pipe material by press-fitting a punch into the primary molded body and press-fitting the outer periphery of the primary molded body into the concave and convex portions of the molding die. And a second pipe material whose diameters are preliminarily expanded at both ends in a molding die having a screw mold, and a mandrel whose outer shape gradually increases is press-fitted into the second pipe material, so that the outer periphery of the second pipe material Form a thread on Of the first pipe material having the rack teeth and the second pipe material having the threaded portion, one is convex and the other is concave, and then joined by caulking or welding. And the step of performing .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to embodiments shown in the drawings.
[0008]
As shown in FIG. 1, the steering rack bar according to the present invention comprises a hollow rack portion 1A and a screw portion 1B, and a pinion 32 fixed to a steering shaft 31 is meshed with the rack portion 1A. The screw portion 1B is provided with, for example, a ball screw mechanism 33 (position is fixed) driven by an electric motor, and the ball screw mechanism 33 is operated during steering operation to move the rack bar in the steering direction (arrow direction in the figure). Is.
[0009]
Hereinafter, any of the rack bars shown in FIGS. 2 to 5 is used in the same manner as in FIG.
[0010]
FIG. 2 is a perspective view of the rack bar according to claim 3 in which the rack bar according to claim 2 of the present invention is embodied. The rack bar 1 includes a rack portion 1A composed of a hollow rack cage 2A and a separate hollow screw. It is comprised by the thread part 1B which consists of the collar | guard 2B, and both were integrally couple | bonded so that it might adjoin on the same axis line.
[0011]
FIG. 4 shows a rack bar 2 in the case of claim 4 in which the rack bar according to claim 2 is embodied. In this case, the rack part 1A is the hollow rack cage 2A shown in FIG. 2, and the screw part 1B is not present. The blank screw rod 3B is made of a different material and is integrally joined so as to be adjacent on the same axis.
[0012]
FIG. 5 shows a rack bar 3 in the case of claim 5 in which the rack bar according to claim 2 is embodied. The rack portion 1A is an empty rack cage 3A made of an empty material, and the screw rod 2B is shown in FIG. The same hollow screw rod 2B as 2 is integrally coupled.
[0013]
The coupling in the case of FIG. 2 to FIG. 5 is by a known means, for example, by fitting one of the two end faces as convex and the other as concave and then by caulking or by welding such as pressure welding. This is done by combining.
[0014]
The rack cage 2A is formed of a pipe material, and the manufacturing method thereof is, for example, as shown in FIGS. 6 to 10, for forming a hollow rack cage 2A, a pair of semi-cylinders that are symmetrical. The primary molds 11 and 12 for primary molding are used. The lower facing surfaces 11a and 12a which form the vertical of the split molds 11 and 12 abut each other without any spacing, and the upper facing surfaces 11b and 12b which form the vertical form have a spacing equal to the width of the teeth of the rack to be obtained. Hold and pull each other sideways.
Between the upper and lower opposing surfaces 11b, 11a, 12b, and 12a of the split molds 11 and 12, concave arcuate surfaces 11c and 12c that are in contact with the outside of the pipe member 2a ′ are formed.
[0015]
Therefore, after fitting the pipe material 2a ', which is the material of the rack cage 2A to be obtained, into the arcuate surfaces 11c, 12c without looseness, the split molds 11, 12 are joined by appropriate means. Next, the upper surface portion 2b of the pipe material 2a 'exposed between the upper facing surfaces 11b and 12b is heated and softened by an appropriate means.
[0016]
In this state, between the upper facing surfaces 11b, 12b of the split dies 11, 12, a square hook-shaped press die 13 having a length substantially equal to the flat portion 4 forming the tooth row 7 formation portion of the rack to be obtained is press-fitted. Then, the upper surface portion 2b of the pipe material 2a ′ is pressed flat.
[0017]
Then, as shown in FIG. 7 and FIG. 8, both end portions have a circular cross section, and between them, the flat portion 4 having the required length is the same width as the width of the tooth row 7 of the rack cage 2A to be obtained. The provided primary molded body 2a is formed.
[0018]
At this time, since the upper surface portion 2b of the primary molded body 2a is heated and softened, the back side of the formed flat surface portion 4 is in a raised state in the shape of a convex lens having a thick central portion. In the figure, 5 and 6 have circular cross sections at both ends of the primary molded body 2a.
[0019]
Further, as shown in FIGS. 9 and 10, a pair of left and right secondary forming split molds 21 and 22 that complement the rack to be obtained are prepared.
[0020]
Both of the split molds 21 and 22 have a semi-cylindrical shape, and the upper surfaces of the recessed holes 21a and 22a on the opposite surfaces thereof are orthogonal to the axis except for both ends, and the uneven portions 21b corresponding to the tooth rows 7 of the rack. 22b is formed. Both end portions of the recessed holes 21a and 22a are semicircular portions 21c and 22c which are combined to form a circular portion having the same isometric shape as both end portions of the primary molded body 2a.
[0021]
Here, reference numeral 23 denotes a punch having an oval shape, the outer shape of which is substantially the same as the inner shape of the non-circular portion of the primary molded body 2a, and the distance from the center to the flat surface portion 23a which is the upper surface is the primary It is larger than the distance to the plane part 4 from the axis of the molded body 2a.
[0022]
The front end portion of the flat portion 23a is formed in an inclined portion 23c that is inclined downward toward the front.
[0023]
The front end surface 23d of the punch 23 has the same shape as the inner surface of the primary molded body 3a and is slightly smaller than that.
[0024]
The primary molded body 2a is inserted into the secondary molding split molds 21 and 22, and the secondary molding split molds 21 and 22 are joined. Then, the primary molded body 2a is inserted into the primary molded body 2a from its right end. The punch 23 is forcibly press-fitted.
[0025]
Then, only the flat surface portion 4 of the primary molded body 3a is pushed by the inclined portion 23c at the front end of the punch 23, and the meat on the outer peripheral surface bites into the concavo-convex portions 21b and 22b of the split dies 21 and 22, and is plastic. The tooth row 7 is formed by deformation.
[0026]
In addition, the shape and dimension of the tooth row 7 are determined according to the tooth shape of the pinion and the like to be meshed therewith.
[0027]
There are various methods for forming the hollow screw rod 3B. As shown in FIG. 11, for example, as shown in FIG. 11, a screw die for each half of the thread of the screw rod 3B to be obtained on the mating surface of the split molds 24a and 24b. the mold 24 having a 25, 25, pay pipe material 3a which has previously been expanded processing ends, the pipe material 3a in the mold 24, the outer diameter from the tip D 1, D 2, D The mandrel 26 that gradually increases as shown in FIG. 3 is press-fitted in the direction of the white arrow by a pressurizing means such as hydraulic pressure, and the outer periphery of the pipe material 3a is press-fitted into the screw dies 25, 25 in the molding die 24. According to the method of forming the screw rod 3B by forming a screw thread on the outer periphery. In this case, the mandrel 26 is preferably press-fitted from both ends of the pipe material 3a over the entire length of the pipe material 3a.
In addition, it is formed by bulging, rolling from the outer periphery, or a combination of these, and the external appearance is as shown in FIG. 2, and the axial cross section is formed with a screw 8a on the outer peripheral surface as shown in FIG. Is done.
[0028]
【The invention's effect】
Since the present invention is configured as described above, when the steering system is an electric type, a rack bar can be used in which the engine horsepower is prevented from being lowered because it is battery-driven. Further, the object of weight reduction of the rack bar can be achieved by using a hollow pipe for the rack part and the screw part as shown in claim 3.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a steering rack bar and its operating principle according to claim 1 of the present invention;
FIG. 2 is a perspective view showing a steering rack bar according to claim 3 of the present invention.
3 is a cross-sectional view taken along line AA in FIG.
FIG. 4 is a perspective view showing a steering rack bar according to claim 4 of the present invention.
FIG. 5 is a perspective view showing a steering rack bar according to claim 5 of the present invention.
FIG. 6 is a longitudinal side view showing a state immediately before starting molding by fitting a pipe into a primary molding split mold in a method for manufacturing a hollow rack cage.
FIG. 7 is a longitudinal side view showing the state at the end of molding.
FIG. 8 is a perspective view of the primary molded body.
FIG. 9 is a central longitudinal sectional front view showing a state where the primary molded body is being molded in the secondary molding split mold.
10 is a cross-sectional view taken along the line BB in FIG.
11 is a cross-sectional view showing a method for manufacturing a hollow screw rod according to claim 6. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rack bar 1A Rack part 1B Screw part 2 Rack bar 2A Rack 杆 2B Screw 杆 3 Rack bar 3A Rack 杆 3B Screw 杆 31 Steering shaft 32 Pinion 33 Ball screw mechanism

Claims (4)

ハンドル軸の回転をギヤ伝達系を介して直線運動に変換し、車輪を操舵するためのラックバーにおいて、
前記ギヤ伝達系と噛合するラック部のラック歯列の幅に対応する長さの平面部を有し、前記平面部にラック歯が形成されている中空ラック杆と、
前記直線運動による動力の伝達を受けるための中空ネジ杆とを有し、
前記中空ラック杆と前記中空ネジ杆が別部材からなり、前記中空ラック杆の一端と前記中空ネジ杆の他端をかしめまたは溶接により接合してなることを特徴とするネジ軸を備えたステアリング用ラックバー。In the rack bar to convert the rotation of the handle shaft into linear motion via the gear transmission system and steer the wheels,
A hollow rack cage having a plane portion having a length corresponding to the width of the rack tooth row of the rack portion meshing with the gear transmission system, and rack teeth are formed on the plane portion;
A hollow screw rod for receiving power transmission by the linear motion;
The hollow rack rod and the hollow screw rod are made of different members, and one end of the hollow rack rod and the other end of the hollow screw rod are joined by caulking or welding, for steering having a screw shaft Rack bar. ハンドル軸の回転をギヤ伝達系を介して直線運動に変換し、車輪を操舵するためのラックバーにおいて、
前記ギヤ伝達系と噛合するラック部のラック歯列の幅に対応する長さの平面部を有し、前記平面部にラック歯が形成されている中空ラック杆と、
前記直線運動による動力の伝達を受けるためのネジ部を無空ねじ杆とを有し、
前記中空ラック杆と前記無空ネジ杆が別部材からなり、前記中空ラック杆の一端と前記無空ネジ杆の他端をかしめまたは溶接により接合してなることを特徴とするネジ軸を備えたステアリング用ラックバー。In the rack bar to convert the rotation of the handle shaft into linear motion via the gear transmission system and steer the wheels,
A hollow rack cage having a plane portion having a length corresponding to the width of the rack tooth row of the rack portion meshing with the gear transmission system, and rack teeth are formed on the plane portion;
A screw part for receiving power transmission by the linear motion has a non-empty screw rod,
The hollow rack cage and the non-empty screw rod are made of different members, and provided with a screw shaft characterized in that one end of the hollow rack cage and the other end of the non-empty screw rod are joined by caulking or welding . Rack bar for steering. ハンドル軸の回転をギヤ伝達系を介して直線運動に変換し、車輪を操舵するためのラックバーにおいて、
前記ギヤ伝達系と噛合するラック部のラック歯列の幅に対応する長さの平面部を有し、前記平面部にラック歯が形成されている無空ラック杆と、
前記直線運動による動力の伝達を受けるためのネジ部を中空ねじ杆とを有し、
前記無空ラック杆と前記中空ネジ杆が別部材からなり、前記無空ラック杆の一端と前記中空ネジ杆の他端をかしめまたは溶接により接合してなることを特徴とするネジ軸を備えたステアリング用ラックバー。In the rack bar to convert the rotation of the handle shaft into linear motion via the gear transmission system and steer the wheels,
A non-empty rack cage having a plane portion having a length corresponding to the width of a rack tooth row of a rack portion meshing with the gear transmission system, and rack teeth are formed on the plane portion;
A screw portion for receiving power transmission by the linear motion has a hollow screw rod,
The empty rack rod and the hollow screw rod are made of different members, and one end of the empty rack rod and the other end of the hollow screw rod are joined by caulking or welding . Rack bar for steering. ギヤ伝達系と噛合するラック部を中空ラック杵と、直線運動による動力の伝達を受けるためのネジ部を有する中空ねじ杆とからなるネジ軸を備えたステアリング用ラックバーの製造方法において、
第１のパイプ素材にラック歯列の幅に対応する長さの平面部を有する一次形成体を加工する工程と、
内部にラック歯列に対応する凹凸部が形成された割型からなる成形用型内に納め、前記一次成形体にポンチを圧入して一次成形体の外周の肉を成形用型の凹凸部に圧入させて第１パイプ素材の外周にラック歯を成形する工程と、
ねじ型を有する成形型内に、両端を予め拡径加工された第２のパイプ素材を納め、外形が漸増するマンドレルを前記第２パイプ素材に圧入することにより前記第２パイプ素材に外周にネジ部を形成する工程と、
前記ラック歯の形成された第１パイプ素材と、ネジ部の形成された第２パイプ素材の両端部のうち、一方を凸、他方を凹として嵌合させてからかしめまたは溶接により接合する工程と、
からなることを特徴とするステアリング用ラックバーの製造方法。 In a manufacturing method of a steering rack bar having a screw shaft including a hollow rack rod having a rack portion meshing with a gear transmission system and a hollow screw rod having a screw portion for receiving power transmission by linear motion,
Processing a primary formed body having a flat portion having a length corresponding to the width of the rack tooth row on the first pipe material;
It is placed in a molding die composed of a split mold in which concave and convex portions corresponding to rack tooth rows are formed, and a punch is press-fitted into the primary molded body so that the outer periphery of the primary molded body becomes the concave and convex portions of the molding die. Press-fitting and forming rack teeth on the outer periphery of the first pipe material;
A second pipe material whose diameter has been expanded in advance at both ends is placed in a mold having a screw mold, and a mandrel whose outer shape gradually increases is press-fitted into the second pipe material, so that a screw is formed on the outer periphery of the second pipe material. Forming a part;
A step of fitting the first pipe material with the rack teeth and the second pipe material with the threaded portion formed as one convex and the other as the concave, and then joining by caulking or welding; and ,
A method of manufacturing a steering rack bar, comprising:
JP28880195A 1995-11-07 1995-11-07 Steering rack bar with screw shaft Expired - Fee Related JP3739450B2 (en)

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Application Number Priority Date Filing Date Title
JP28880195A JP3739450B2 (en) 1995-11-07 1995-11-07 Steering rack bar with screw shaft

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US20020020237A1 (en) * 2000-08-04 2002-02-21 Akira Tsubouchi Hollow rack shaft
JP3772110B2 (en) 2001-11-29 2006-05-10 高周波熱錬株式会社 Hollow steering rack shaft and manufacturing method thereof
JP2004010956A (en) 2002-06-06 2004-01-15 Toyoda Mach Works Ltd Heat treatment method of rack bar, and rack bar
CN100364832C (en) * 2003-09-23 2008-01-30 毕晓普创新有限公司 Composite steering rack
JP4539292B2 (en) * 2004-11-01 2010-09-08 株式会社ジェイテクト Rack bar
WO2006047825A1 (en) * 2004-11-04 2006-05-11 Bishop Innovation Limited Composite steering rack
EP1827947A1 (en) * 2004-12-20 2007-09-05 Bishop Innovation Limited Composite steering rack
JP2015042896A (en) * 2013-07-22 2015-03-05 Thk株式会社 Rotation/linear motion conversion device and steering system
DE102014225104B4 (en) 2014-12-08 2022-04-14 Volkswagen Aktiengesellschaft Method of making a lightweight steering rack and steering rack made thereby

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JP2021037526A (en) * 2019-09-03 2021-03-11 日立オートモティブシステムズ株式会社 Method for manufacturing steering shaft
JP7240293B2 (en) 2019-09-03 2023-03-15 日立Astemo株式会社 Manufacturing method of steering shaft

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