JP7086729B2 - Manufacturing method of rack bar preformed body and rack bar - Google Patents

Manufacturing method of rack bar preformed body and rack bar Download PDF

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JP7086729B2
JP7086729B2 JP2018106843A JP2018106843A JP7086729B2 JP 7086729 B2 JP7086729 B2 JP 7086729B2 JP 2018106843 A JP2018106843 A JP 2018106843A JP 2018106843 A JP2018106843 A JP 2018106843A JP 7086729 B2 JP7086729 B2 JP 7086729B2
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rack
tooth
rack bar
pitch
shaft
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JP2019210993A (en
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聖人 野村
渉 松本
晃司 小山
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Neturen Co Ltd
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Neturen Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/06—Surface hardening
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0075—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rods of limited length
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/26—Racks
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/673—Quenching devices for die quenching
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Gears, Cams (AREA)
  • Heat Treatment Of Articles (AREA)

Description

本発明は、ラックバー予備成形体及びラックバーの製造方法に関する。 The present invention relates to a rack bar preformed body and a method for manufacturing a rack bar.

自動車のラックアンドピニオン式ステアリング装置等に用いられるラックバーは、一般に焼入れされており、焼入れに伴う変形を抑制する観点から、拘束された状態で焼入れされている（例えば特許文献１、２参照）。特許文献２に記載されたラックバーの製造方法は、ラックバーにトルクを掛けた状態で焼入れを行うことにより、焼入れに伴う捩れ方向の変形を抑制している。 Rack bars used in rack and pinion type steering devices of automobiles are generally quenched, and are quenched in a restrained state from the viewpoint of suppressing deformation due to quenching (see, for example, Patent Documents 1 and 2). .. The method for manufacturing a rack bar described in Patent Document 2 suppresses deformation in the twisting direction due to quenching by quenching the rack bar with torque applied.

特開２００１－０１１５３６号公報Japanese Unexamined Patent Publication No. 2001-101536 特開２０１４－１３３９２４号公報Japanese Unexamined Patent Publication No. 2014-133924

ラックバーの捩れ方向の変形は、ラックとピニオンとの噛み合わせの悪化、伝達効率の低下の要因となり得る。特に、二つのラック部を備え、一方のラック部にてステアリングシャフトの操舵ピニオンと噛み合い、他方のラック部にてアシスト機構の補助ピニオンと噛み合うデュアルピニオン式のラックバーでは、ラックバーの捩れ方向の変形が、二つのラック部の間の中心軸まわりの回転角度差の精度を低下させ、噛み合わせの悪化等が懸念される。特許文献２に記載されたラックバーの製造方法は、焼入れを行う際にラックバーにトルクを掛けて捩れ方向の変形を抑制しており、トルクを掛ける追加の設備を要する。 Deformation in the twisting direction of the rack bar may cause deterioration of the meshing between the rack and the pinion and a decrease in transmission efficiency. In particular, in a dual pinion type rack bar that has two rack parts, one rack part meshes with the steering pinion of the steering shaft, and the other rack part meshes with the auxiliary pinion of the assist mechanism, the rack bar is in the twisting direction. Deformation reduces the accuracy of the difference in rotation angle around the central axis between the two rack portions, and there is concern that the meshing may deteriorate. The method for manufacturing a rack bar described in Patent Document 2 applies torque to the rack bar during quenching to suppress deformation in the twisting direction, and requires additional equipment for applying torque.

本発明は、上述した事情に鑑みなされたものであり、ラックバーの捩れを容易に軽減することを目的とする。 The present invention has been made in view of the above circumstances, and an object of the present invention is to easily reduce the twist of the rack bar.

本発明の一態様のラックバー予備成形体は、未焼入れのラックバー予備成形体であって、軸材の軸方向に並ぶ複数のラック歯を備え、前記複数のラック歯のピッチ面は、前記軸材の中心軸周りに捩れている。 The rack bar preformed body according to one aspect of the present invention is an unquenched rack bar preformed body, comprising a plurality of rack teeth arranged in the axial direction of the shaft material, and the pitch surfaces of the plurality of rack teeth are the above-mentioned. It is twisted around the central axis of the shaft material.

また、本発明の一態様のラックバーの製造方法は、軸材の軸方向に並ぶ複数のラック歯のピッチ面が前記軸材の中心軸周りに捩れるように、前記複数のラック歯を前記軸材に形成する歯形成ステップと、前記複数のラック歯が形成された前記軸材を焼入れし、前記ピッチ面を焼入れによって捩り戻す焼入れステップと、を備える。 Further, in the method for manufacturing a rack bar according to one aspect of the present invention, the plurality of rack teeth are twisted around the central axis of the shaft material so that the pitch surfaces of the plurality of rack teeth arranged in the axial direction of the shaft material are twisted. A tooth forming step formed on the shaft material and a quenching step of quenching the shaft material on which the plurality of rack teeth are formed and twisting back the pitch surface by quenching are provided.

本発明によれば、ラックバーの捩れを容易に軽減することができる。 According to the present invention, the twist of the rack bar can be easily reduced.

本発明の実施形態を説明するための、ラックバーの一例の平面図である。It is a top view of an example of a rack bar for demonstrating an embodiment of this invention. 図１のラックバーの断面図である。It is sectional drawing of the rack bar of FIG. 図１のラックバーの予備成形体の平面図である。It is a top view of the preformed body of the rack bar of FIG. 図１のラックバーの製造方法の一例の模式図である。It is a schematic diagram of an example of the manufacturing method of the rack bar of FIG. 図１のラックバーの製造方法の一例の模式図である。It is a schematic diagram of an example of the manufacturing method of the rack bar of FIG. 図５に示すラック歯型の一例の模式図である。It is a schematic diagram of an example of the rack tooth type shown in FIG. 本発明の実施形態を説明するための、ラックバーの他の例の平面図である。It is a top view of another example of a rack bar for demonstrating embodiment of this invention. 図７のラックバーの断面図である。It is sectional drawing of the rack bar of FIG. 図７のラックバーの予備成形体の平面図である。It is a top view of the preformed body of the rack bar of FIG.

図１及び図２は、本発明の実施形態を説明するための、ラックバーの一例を示し、図３は、図１及び図２のラックバーの予備成形体を示す。 1 and 2 show an example of a rack bar for explaining an embodiment of the present invention, and FIG. 3 shows a preformed body of the rack bar of FIGS. 1 and 2.

図１及び図２に示すラックバー１０は、円筒形状の中空の軸材１１からなり、軸材１１は、例えば鋼等の金属材料によって形成されている。軸材１１の一方の端部１１ａ側には、ステアリング装置のピニオンと噛み合う複数のラック歯１３を有するラック部１２が設けられており、軸材１１の他方の端部１１ｂ側には、ステアリング装置のハウジングに移動可能に支持される円筒形状の軸部１４が設けられている。 The rack bar 10 shown in FIGS. 1 and 2 is made of a cylindrical hollow shaft member 11, and the shaft member 11 is formed of a metal material such as steel. A rack portion 12 having a plurality of rack teeth 13 that mesh with the pinion of the steering device is provided on one end 11a side of the shaft member 11, and a steering device is provided on the other end 11b side of the shaft member 11. A cylindrical shaft portion 14 that is movably supported is provided in the housing.

ラック部１２には、軸材１１の軸方向に延びる平潰し部１５が形成されている。そして、複数のラック歯１３は、軸材１１の軸方向に並んで平潰し部１５の外面に形成されている。複数のラック歯１３のピッチ面ＰＳは軸材１１の中心軸と平行な平面である。ここで、ピッチ面ＰＳは、ピニオンのピッチ円と転がり接触する面である。 The rack portion 12 is formed with a flattening portion 15 extending in the axial direction of the shaft member 11. The plurality of rack teeth 13 are formed on the outer surface of the flattened portion 15 side by side in the axial direction of the shaft member 11. The pitch surface PS of the plurality of rack teeth 13 is a plane parallel to the central axis of the shaft member 11. Here, the pitch surface PS is a surface that rolls into contact with the pitch circle of the pinion.

本例では、ラック歯１３の歯すじＴＴが軸材１１の軸方向と垂直な方向に対して傾いており、ラック歯１３のピッチｐ１が一定となっている。ここで、歯すじＴＴは、ラック歯１３の歯面とピッチ面ＰＳとの交線である。なお、ラック歯１３の歯すじは、軸材１１の軸方向と垂直であってもよく、ラック歯１３のピッチは、例えばラック部１２の軸方向中央部において相対的に狭く、ラック部１２の軸方向両端部において相対的に広くなるように変化していてもよい。 In this example, the tooth streak TT of the rack tooth 13 is tilted with respect to the direction perpendicular to the axial direction of the shaft member 11, and the pitch p1 of the rack tooth 13 is constant. Here, the tooth streak TT is a line of intersection between the tooth surface of the rack tooth 13 and the pitch surface PS. The tooth streaks of the rack teeth 13 may be perpendicular to the axial direction of the shaft member 11, and the pitch of the rack teeth 13 is relatively narrow, for example, in the axial center portion of the rack portion 12, and the rack portion 12 has a tooth streak. It may be changed so as to be relatively wide at both ends in the axial direction.

ステアリング装置のピニオンと噛み合うラック部１２の硬度を高め、ステアリング装置のハウジングに支持される軸部１４の硬度を高めるため、ラック部１２及び軸部１４には焼入れが施されている。 The rack portion 12 and the shaft portion 14 are hardened in order to increase the hardness of the rack portion 12 that meshes with the pinion of the steering device and to increase the hardness of the shaft portion 14 supported by the housing of the steering device.

図３に示すラックバー予備成形体１６は、ラック部１２及び軸部１４に焼入れが施されていない未焼入れのラックバー１０と言うことができ、ラックバー１０と同様に構成されている。ただし、予備成形体１６において、複数のラック歯１３のピッチ面ＰＳは軸材１１の中心軸周りに捩れている。ラック歯１３の歯すじＴＴが軸材１１の軸方向と垂直な方向に対して傾いている本例では、予備成形体１６におけるピッチ面ＰＳは、ラック歯１３のピッチを広げる（ｐ１＜ｐ２）Ａ方向に捩れている。 The rack bar preformed body 16 shown in FIG. 3 can be said to be an unquenched rack bar 10 in which the rack portion 12 and the shaft portion 14 are not hardened, and is configured in the same manner as the rack bar 10. However, in the preformed body 16, the pitch surface PS of the plurality of rack teeth 13 is twisted around the central axis of the shaft member 11. In this example, in which the tooth streak TT of the rack tooth 13 is tilted with respect to the direction perpendicular to the axial direction of the shaft member 11, the pitch surface PS in the preformed body 16 widens the pitch of the rack tooth 13 (p1 <p2). It is twisted in the A direction.

本例では、予備成形体１６における複数のラック歯１３の歯先面１３ａは、軸材１１の軸方向と平行な同一平面上に配置されており、複数のラック歯１３の歯底面１３ｂもまた、軸材１１の軸方向と平行な同一平面上に配置されている。 In this example, the tooth tip surfaces 13a of the plurality of rack teeth 13 in the preformed body 16 are arranged on the same plane parallel to the axial direction of the shaft member 11, and the tooth bottom surfaces 13b of the plurality of rack teeth 13 are also arranged. , Are arranged on the same plane parallel to the axial direction of the shaft member 11.

図４及び図５を参照して、ラックバー１０の製造方法を説明する。 A method for manufacturing the rack bar 10 will be described with reference to FIGS. 4 and 5.

＜予備成形ステップ＞
まず、図４に示すように、軸材１１の端部１１ａ側の一部が、プレス加工で平坦状に押し潰され、軸材１１の軸方向に延びる平潰し部１５が形成される。この後、必要に応じて、軸材１１の表面にリン酸塩皮膜を形成する化成処理が施され、平潰し部１５に複数のラック歯１３が形成される。 <Pre-molding step>
First, as shown in FIG. 4, a part of the end portion 11a side of the shaft member 11 is crushed flat by press working to form a flat crushed portion 15 extending in the axial direction of the shaft member 11. After that, if necessary, a chemical conversion treatment for forming a phosphate film is performed on the surface of the shaft member 11, and a plurality of rack teeth 13 are formed on the flattened portion 15.

＜歯形成ステップ＞
図５に示すように、平潰し部１５を含む軸材１１の軸方向の少なくとも一部が金型２０によって保持される。金型２０は上型２１と下型２２とを備える。上型２１と下型２２とは、図示しない型締め機構により開閉され、軸材１１を上下方向に挟み、軸材１１の外周を保持する。上型２１にはラック歯型２３が取外し可能に装着されており、ラック歯型２３は平潰し部１５の外面に当接した状態で固定される。平潰し部１５に接するラック歯型２３の成形面２４には、複数のラック歯１３を成形する複数の歯溝２５が設けられている。 <Tooth formation step>
As shown in FIG. 5, at least a part of the shaft member 11 including the flattened portion 15 in the axial direction is held by the die 20. The mold 20 includes an upper mold 21 and a lower mold 22. The upper mold 21 and the lower mold 22 are opened and closed by a mold clamping mechanism (not shown), sandwich the shaft member 11 in the vertical direction, and hold the outer periphery of the shaft member 11. The rack tooth mold 23 is detachably attached to the upper mold 21, and the rack tooth mold 23 is fixed in contact with the outer surface of the flat crushed portion 15. A plurality of tooth grooves 25 for forming a plurality of rack teeth 13 are provided on the forming surface 24 of the rack tooth mold 23 in contact with the flattening portion 15.

ラック歯型２３が平潰し部１５の外面に当接した状態で、芯金３０が、軸材１１の端部１１ａ側の開口を通して軸材１１に挿入され、押棒３１によって平潰し部１５の内部に圧入される。そして、圧入された芯金３０は、軸材１１の端部１１ｂ側の開口から挿入される押棒３２によって押し戻され、軸材１１から排出される。芯金３０が平潰し部１５の全長に亘って往復移動される過程で、平潰し部１５の材料が芯金３０によってしごかれ、ラック歯型２３に向けて塑性流動する。 The core metal 30 is inserted into the shaft member 11 through the opening on the end portion 11a side of the shaft member 11 in a state where the rack tooth mold 23 is in contact with the outer surface of the flattened portion 15, and the inside of the flattened portion 15 is inserted by the push rod 31. Is press-fitted into. Then, the press-fitted core metal 30 is pushed back by the push rod 32 inserted from the opening on the end portion 11b side of the shaft member 11, and is discharged from the shaft member 11. In the process of reciprocating the core metal 30 over the entire length of the flattened portion 15, the material of the flattened portion 15 is squeezed by the core metal 30 and plastically flows toward the rack tooth mold 23.

芯金３０が次第に大きなものに替えられ、芯金３０の圧入が繰り返されることにより、平潰し部１５の材料がラック歯型２３の歯溝２５に次第に食い込み、ラック歯型２３の成形面２４の形状が平潰し部１５に転写され、平潰し部１５に複数のラック歯１３が形成される。以上のステップを経て予備成形体１６が製造される。 The core metal 30 is gradually replaced with a larger one, and as the core metal 30 is repeatedly press-fitted, the material of the flattened portion 15 gradually bites into the tooth groove 25 of the rack tooth mold 23, and the molded surface 24 of the rack tooth mold 23 The shape is transferred to the flattened portion 15, and a plurality of rack teeth 13 are formed on the flattened portion 15. The preformed body 16 is manufactured through the above steps.

＜焼入れステップ＞
次に、ラック部１２の硬度を高め、軸部１４の硬度を高めるため、ラック部１２と軸部１４とに焼入れが施される。なお、ラック部１２及び軸部１４を含む予備成形体１６の全体に焼入れが施されてもよい。焼入れの際の加熱は、例えば高周波誘導加熱によって行うことができるが、高周波誘導加熱に限定されない。 <Quenching step>
Next, in order to increase the hardness of the rack portion 12 and increase the hardness of the shaft portion 14, the rack portion 12 and the shaft portion 14 are quenched. The entire preformed body 16 including the rack portion 12 and the shaft portion 14 may be quenched. The heating at the time of quenching can be performed by, for example, high frequency induction heating, but is not limited to high frequency induction heating.

焼入れに伴ってラック部１２に捩れ方向の変形が生じる。変形の要因として、焼入れの際のラック歯における熱分布が考えられる。熱分布に起因する捩れは一定の方向に生じる。また、変形の他の要因として、焼入れの際の変態応力が考えられる。変態応力に起因する捩れはラック歯１３の形状によって定まり、ラック歯１３の歯すじＴＴが軸材１１の軸方向と垂直な方向に対して斜めに設定されている場合に、ラック歯１３のピッチを狭める方向に生じる。 With quenching, the rack portion 12 is deformed in the twisting direction. The cause of deformation is considered to be the heat distribution in the rack teeth during quenching. The twist caused by the heat distribution occurs in a certain direction. Further, as another factor of deformation, transformation stress during quenching can be considered. The twist caused by the transformation stress is determined by the shape of the rack teeth 13, and when the tooth streak TT of the rack teeth 13 is set diagonally with respect to the direction perpendicular to the axial direction of the shaft member 11, the pitch of the rack teeth 13 is set. Occurs in the direction of narrowing.

ここで、予備成形体１６におけるピッチ面ＰＳはラック歯１３のピッチを広げるＡ方向（図３参照）に捩れている。予備成形体１６の焼入れに伴い、ラック歯１３のピッチを狭める方向（Ａ方向とは反対方向）にラック部１２が捩れることにより、ピッチ面ＰＳが軸材１１の軸方向に平行な平面に捩り戻される。焼入れに伴ってラック部１２に生じる捩れ方向の変形量（捩れ角）と、この変形量を相殺する予備成形体１６におけるピッチ面ＰＳの捩れ角とは、例えば標準的な長さのラック部１２において０．０５°～０．１°程度であり、実験的に求められる。 Here, the pitch surface PS in the preformed body 16 is twisted in the A direction (see FIG. 3) that widens the pitch of the rack teeth 13. As the preformed body 16 is quenched, the rack portion 12 is twisted in the direction of narrowing the pitch of the rack teeth 13 (in the direction opposite to the A direction), so that the pitch surface PS becomes a plane parallel to the axial direction of the shaft member 11. It is twisted back. The amount of deformation (twist angle) in the twisting direction that occurs in the rack portion 12 due to quenching and the twist angle of the pitch surface PS in the preformed body 16 that cancels this deformation amount are, for example, the rack portion 12 having a standard length. It is about 0.05 ° to 0.1 ° in, and is obtained experimentally.

このように、未焼入れの予備成形体１６においては、複数のラック歯１３のピッチ面ＰＳが軸材１１の中心軸周りに捩れており、予備成形体１６の焼入れに伴ってピッチ面ＰＳは平面状に捩り戻されるので、予備成形体１６が焼入れされてなるラックバー１０の捩れを容易に軽減することができる。 As described above, in the unquenched pre-molded body 16, the pitch surface PS of the plurality of rack teeth 13 is twisted around the central axis of the shaft member 11, and the pitch surface PS is flat as the pre-quenched body 16 is hardened. Since the preformed body 16 is untwisted back into a shape, the twisting of the rack bar 10 formed by quenching the preformed body 16 can be easily reduced.

図６は、ラックバー１０の製造に用いられるラック歯型２３の一例を示す。 FIG. 6 shows an example of a rack tooth mold 23 used for manufacturing the rack bar 10.

ラック歯型２３の複数の歯溝２５に円柱状のピン２６をそれぞれ配置した場合に、歯溝２５の側面とピン２６との接線ＴＬは、複数の歯溝２５の並び方向の一端側から他端側に向かうに従って次第に傾いている。ラック歯１３は歯溝２５によって成形され、歯溝２５の側面とピン２６との接線ＴＬはラック歯１３の歯すじＴＴに対応する。歯溝２５の側面とピン２６との接線ＴＬが次第に傾いていることから、成形されたラック歯１３の歯すじＴＴも次第に傾く。これにより、予備成形体１６において、複数のラック歯１３の歯すじＴＴが配置されるピッチ面ＰＳは、軸材１１の中心軸まわりに捩れたものとなる。 When the columnar pins 26 are arranged in the plurality of tooth grooves 25 of the rack tooth mold 23, the tangent TL between the side surface of the tooth grooves 25 and the pins 26 is from one end side in the arrangement direction of the plurality of tooth grooves 25 to the other. It gradually tilts toward the edge. The rack tooth 13 is formed by the tooth groove 25, and the tangent TL between the side surface of the tooth groove 25 and the pin 26 corresponds to the tooth streak TT of the rack tooth 13. Since the tangent TL between the side surface of the tooth groove 25 and the pin 26 is gradually tilted, the tooth streak TT of the molded rack tooth 13 is also gradually tilted. As a result, in the preformed body 16, the pitch surface PS on which the tooth streaks TT of the plurality of rack teeth 13 are arranged is twisted around the central axis of the shaft member 11.

各歯溝２５の底面２５ａは、この歯溝２５に配置されるピン２６の中心軸と平行に形成することができ、この場合に、複数の底面２５ａは、複数の歯溝２５の並び方向の一端側から他端側に向かうに従って次第に傾くが、好ましくは、複数の底面２５ａは同一平面上に形成される。これにより、ラック歯型２３の製造が容易となる。複数の底面２５ａが同一平面上に形成される場合に、予備成形体１６における複数のラック歯１３の歯先面１３ａが、軸材１１の軸方向と平行な同一平面上に配置される。 The bottom surface 25a of each tooth groove 25 can be formed parallel to the central axis of the pin 26 arranged in the tooth groove 25, and in this case, the plurality of bottom surfaces 25a are in the arrangement direction of the plurality of tooth grooves 25. It gradually tilts from one end side to the other end side, but preferably, the plurality of bottom surfaces 25a are formed on the same plane. This facilitates the manufacture of the rack tooth mold 23. When the plurality of bottom surfaces 25a are formed on the same plane, the tooth tip surfaces 13a of the plurality of rack teeth 13 in the preformed body 16 are arranged on the same plane parallel to the axial direction of the shaft member 11.

また、隣り合う二つの歯溝２５の間の凸部の頂面２５ｂは、一方の歯溝２５に配置されるピン２６の中心軸と平行に形成することができ、この場合に、複数の頂面２５ｂは、複数の歯溝２５の並び方向の一端側から他端側に向かうに従って次第に傾くが、好ましくは、複数の頂面２５ｂは同一平面上に形成される。これにより、ラック歯型２３の製造が容易となる。複数の頂面２５ｂが同一平面上に形成される場合に、予備成形体１６における複数のラック歯１３の歯底面１３ｂが、軸材１１の軸方向と平行な同一平面上に配置される。 Further, the top surface 25b of the convex portion between the two adjacent tooth grooves 25 can be formed parallel to the central axis of the pin 26 arranged in one tooth groove 25, and in this case, a plurality of tops. The surface 25b gradually tilts from one end side to the other end side in the arrangement direction of the plurality of tooth grooves 25, but preferably, the plurality of top surfaces 25b are formed on the same plane. This facilitates the manufacture of the rack tooth mold 23. When the plurality of top surfaces 25b are formed on the same plane, the tooth bottom surfaces 13b of the plurality of rack teeth 13 in the preformed body 16 are arranged on the same plane parallel to the axial direction of the shaft member 11.

図７及び図８は、本発明の実施形態を説明するための、ラックバーの他の例を示し、図９は、図７及び図８のラックバーの予備成形体を示す。なお、上述したラックバー１０及び予備成形体１６と共通する要素には対応する符号を付し、説明を省略又は簡略する。 7 and 8 show other examples of rack bars for explaining embodiments of the present invention, and FIG. 9 shows preformed bodies of the rack bars of FIGS. 7 and 8. The elements common to the rack bar 10 and the preformed body 16 described above are designated by the corresponding reference numerals, and the description thereof will be omitted or simplified.

図７及び図８に示すラックバー１１０では、軸材１１１は円柱形状の中軸の軸材であり、軸材１１１の一方の端部１１１ａ側には、複数のラック歯１１３を有するラック部１１２が設けられており、軸材１１１の他方の端部１１１ｂ側には、円柱形状の軸部１１４が設けられている。そして、本例では、ラック歯１１３の歯すじＴＴは軸材１１１の軸方向と垂直である。 In the rack bar 110 shown in FIGS. 7 and 8, the shaft member 111 is a cylindrical shaft member, and a rack portion 112 having a plurality of rack teeth 113 is provided on one end 111a side of the shaft member 111. A cylindrical shaft portion 114 is provided on the other end portion 111b side of the shaft member 111. In this example, the tooth streak TT of the rack tooth 113 is perpendicular to the axial direction of the shaft member 111.

図９に示すラックバーの予備成形体１１６は、ラック部１１２及び軸部１１４に焼入れが施されていない未焼入れのラックバー１１０と言うことができ、ラックバー１１０と同様に構成されている。ただし、予備成形体１１６において、複数のラック歯１１３のピッチ面ＰＳは軸材１１１の中心軸周りに捩れている。 The preformed body 116 of the rack bar shown in FIG. 9 can be said to be an unquenched rack bar 110 in which the rack portion 112 and the shaft portion 114 are not hardened, and is configured in the same manner as the rack bar 110. However, in the preformed body 116, the pitch surface PS of the plurality of rack teeth 113 is twisted around the central axis of the shaft member 111.

予備成形体１１６は、例えばラック歯型を含む金型を用いた鍛造によって形成され、ラックバー１１０は、予備成形体１１６に焼入れが施されて製造される。焼入れに伴ってラック部１１２には捩れ方向の変形が生じ、変形の要因として、焼入れの際のラック歯における熱分布が考えられる。熱分布に起因する捩れは一定の方向に生じ、捩れ方向は実験的に求められる。予備成形体１１６におけるピッチ面ＰＳが、ラック歯の熱分布に起因する捩じれ方向とは反対方向に捩れていることにより、焼入れに伴い、ピッチ面ＰＳは軸材１１１の軸方向に平行な平面に捩り戻される。 The preformed body 116 is formed by forging using, for example, a mold including a rack tooth mold, and the rack bar 110 is manufactured by quenching the preformed body 116. The rack portion 112 is deformed in the twisting direction with quenching, and the heat distribution in the rack teeth during quenching can be considered as a factor of the deformation. Twisting due to heat distribution occurs in a certain direction, and the twisting direction is experimentally determined. Since the pitch surface PS in the preformed body 116 is twisted in the direction opposite to the twisting direction due to the heat distribution of the rack teeth, the pitch surface PS becomes a plane parallel to the axial direction of the shaft member 111 due to quenching. It is twisted back.

ここまで、シングルピニオン式のラックバー１０，１１０を例にして本発明を説明したが、本発明は、二つのラック部を備えるデュアルピニオン式のラックバーにも適用可能であり、また、ラックバー１０，１１０の軸部１４，１１４にボールネジ等の他の直動要素が形成されたラックバーにも適用可能である。 Up to this point, the present invention has been described by taking the single pinion type rack bars 10 and 110 as an example, but the present invention can also be applied to a dual pinion type rack bar provided with two rack portions, and the rack bar can also be applied. It can also be applied to a rack bar in which other linear motion elements such as ball screws are formed on the shaft portions 14, 114 of 10, 110.

以上、説明したとおり、本明細書に開示されたラックバー予備成形体は、未焼入れのラックバー予備成形体であって、軸材の軸方向に並ぶ複数のラック歯を備え、前記複数のラック歯のピッチ面が、前記軸材の中心軸周りに捩れている。 As described above, the rack bar pre-molded body disclosed in the present specification is an unquenched rack bar pre-molded body, and includes a plurality of rack teeth arranged in the axial direction of the shaft member, and the plurality of racks. The pitch surface of the tooth is twisted around the central axis of the shaft member.

また、本明細書に開示されたラックバー予備成形体は、前記複数のラック歯の歯先面及び歯底面の少なくとも一方は、前記軸材の中心軸に対して平行な同一平面上に設けられている。 Further, in the rack bar preformed body disclosed in the present specification, at least one of the tooth tip surface and the tooth bottom surface of the plurality of rack teeth is provided on the same plane parallel to the central axis of the shaft member. ing.

また、本明細書に開示されたラックバー予備成形体は、前記複数のラック歯それぞれの歯すじは、前記軸方向と垂直な方向に対して傾いており、前記ピッチ面は、ピッチを広げる方向に捩れている。 Further, in the rack bar preformed body disclosed in the present specification, the tooth streaks of each of the plurality of rack teeth are inclined with respect to the direction perpendicular to the axial direction, and the pitch surface is a direction in which the pitch is widened. Twisted in.

また、本明細書に開示されたラックバー予備成形体は、前記軸材は中空軸材である。 Further, in the rack bar preformed body disclosed in the present specification, the shaft material is a hollow shaft material.

また、本明細書に開示されたラックバーの製造方法は、軸材の軸方向に並ぶ複数のラック歯のピッチ面が前記軸材の中心軸周りに捩れるように、前記複数のラック歯を前記軸材に形成する歯形成ステップと、前記複数のラック歯が形成された前記軸材を焼入れし、前記複数のラック歯のピッチ面を焼入れによって捩り戻す焼入れステップと、を備える。 Further, in the method for manufacturing a rack bar disclosed in the present specification, the plurality of rack teeth are twisted around the central axis of the shaft material so that the pitch surfaces of the plurality of rack teeth arranged in the axial direction of the shaft material are twisted. A tooth forming step formed on the shaft material and a quenching step in which the shaft material on which the plurality of rack teeth are formed are quenched and the pitch surfaces of the plurality of rack teeth are twisted back by quenching are provided.

また、本明細書に開示されたラックバーの製造方法は、前記歯形成ステップでは、前記複数のラック歯の歯先面及び歯底面の少なくとも一方が前記軸材の中心軸に対して平行な同一平面上に設けられるように、前記複数のラック歯を前記軸材に形成する。 Further, in the method for manufacturing a rack bar disclosed in the present specification, in the tooth forming step, at least one of the tooth tip surface and the tooth bottom surface of the plurality of rack teeth is the same parallel to the central axis of the shaft material. The plurality of rack teeth are formed on the shaft member so as to be provided on a flat surface.

また、本明細書に開示されたラックバーの製造方法は、前記歯形成ステップでは、前記ピッチ面がピッチを広げる方向に捩れるように、前記複数のラック歯を前記軸材に形成する。 Further, in the method for manufacturing a rack bar disclosed in the present specification, in the tooth forming step, the plurality of rack teeth are formed on the shaft member so that the pitch surface is twisted in a direction in which the pitch is widened.

また、本明細書に開示されたラックバーの製造方法は、前記軸材は中空軸材である。 Further, in the method for manufacturing a rack bar disclosed in the present specification, the shaft material is a hollow shaft material.

１０ ラックバー
１１ 軸材
１１ａ 軸材の端部
１１ｂ 軸材の端部
１２ ラック部
１３ ラック歯
１３ａ ラック歯の歯先面
１３ｂ ラック歯の歯底面
１４ 軸部
１５ 平潰し部
１６ 予備成形体
２０ 金型
２１ 上型
２２ 下型
２３ ラック歯型
２４ 成形面
２５ 歯溝
２５ａ 歯溝の底面
２５ｂ 歯溝の頂面
２６ ピン
３０ 芯金
３１ 押棒
３２ 押棒
１１０ ラックバー
１１１ 軸材
１１１ａ 軸材の端部
１１１ｂ 軸材の端部
１１２ ラック部
１１３ ラック歯
１１４ 軸部
１１６ 予備成形体
ｐ１ ピッチ
ｐ２ ピッチ
ＰＳ ピッチ面
ＴＬ 接線
ＴＴ 歯すじ 10 Rack bar 11 Shaft material 11a Shaft material end 11b Shaft material end 12 Rack part 13 Rack tooth 13a Rack tooth tip surface 13b Rack tooth tooth bottom surface 14 Shaft part 15 Flat crushed part 16 Preformed body 20 Gold Mold 21 Upper mold 22 Lower mold 23 Rack tooth mold 24 Molding surface 25 Tooth groove 25a Bottom surface of tooth groove 25b Top surface of tooth groove 26 Pin 30 Core metal 31 Push rod 32 Push rod 110 Rack bar 111 Shaft material 111a Shaft material end 111b Shaft end 112 Rack part 113 Rack tooth 114 Shaft part 116 Preformed body p1 Pitch p2 Pitch PS Pitch surface TL tangent line TT Tooth streak

Claims (6)

未焼入れのラックバー予備成形体であって、
軸材の軸方向に並ぶ複数のラック歯を備え、
前記複数のラック歯のピッチ面が、前記軸材の中心軸周りに捩れており、
前記複数のラック歯の歯先面及び歯底面の少なくとも一方は、前記軸材の中心軸に対して平行な同一平面上に設けられているラックバー予備成形体。 An unquenched rack bar pre-molded body
Equipped with multiple rack teeth arranged in the axial direction of the shaft material,
The pitch surfaces of the plurality of rack teeth are twisted around the central axis of the shaft member .
A rack bar preformed body in which at least one of the tooth tip surface and the tooth bottom surface of the plurality of rack teeth is provided on the same plane parallel to the central axis of the shaft member. 請求項１記載のラックバー予備成形体であって、 The rack bar preformed body according to claim 1.
前記複数のラック歯それぞれの歯すじは、前記軸方向と垂直な方向に対して傾いており、 The tooth streaks of each of the plurality of rack teeth are inclined with respect to the direction perpendicular to the axial direction.
前記ピッチ面は、ピッチを広げる方向に捩れているラックバー予備成形体。 The pitch surface is a rack bar preformed body that is twisted in a direction that widens the pitch. 請求項１又は２記載のラックバー予備成形体であって、 The rack bar preformed body according to claim 1 or 2.
前記軸材は中空軸材であるラックバー予備成形体。 The shaft material is a rack bar preformed body which is a hollow shaft material. 軸材の軸方向に並ぶ複数のラック歯のピッチ面が前記軸材の中心軸周りに捩れるように、前記複数のラック歯を前記軸材に形成する歯形成ステップと、 A tooth forming step of forming the plurality of rack teeth on the shaft material so that the pitch surfaces of the plurality of rack teeth arranged in the axial direction of the shaft material are twisted around the central axis of the shaft material.
前記複数のラック歯が形成された前記軸材を焼入れし、前記複数のラック歯のピッチ面を焼入れによって捩り戻す焼入れステップと、 A quenching step of quenching the shaft material on which the plurality of rack teeth are formed and twisting back the pitch surfaces of the plurality of rack teeth by quenching.
を備え、 Equipped with
前記歯形成ステップでは、前記複数のラック歯の歯先面及び歯底面の少なくとも一方が前記軸材の中心軸に対して平行な同一平面上に設けられるように、前記複数のラック歯を前記軸材に形成するラックバーの製造方法。 In the tooth forming step, the plurality of rack teeth are provided on the same plane parallel to the central axis of the shaft member so that at least one of the tooth tip surface and the tooth bottom surface of the plurality of rack teeth is provided on the shaft. A method for manufacturing a rack bar to be formed on a material. 請求項４記載のラックバーの製造方法であって、 The method for manufacturing a rack bar according to claim 4.
前記歯形成ステップでは、前記ピッチ面がピッチを広げる方向に捩れるように、前記複数のラック歯を前記軸材に形成するラックバーの製造方法。 In the tooth forming step, a method for manufacturing a rack bar in which a plurality of rack teeth are formed on the shaft member so that the pitch surface is twisted in a direction in which the pitch is widened. 請求項４又は５記載のラックバーの製造方法であって、 The method for manufacturing a rack bar according to claim 4 or 5.
前記軸材は中空軸材であるラックバーの製造方法。 A method for manufacturing a rack bar in which the shaft material is a hollow shaft material.
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