JP6496771B2 - Rack manufacturing apparatus and rack manufacturing method - Google Patents
Rack manufacturing apparatus and rack manufacturing method Download PDFInfo
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- JP6496771B2 JP6496771B2 JP2017081476A JP2017081476A JP6496771B2 JP 6496771 B2 JP6496771 B2 JP 6496771B2 JP 2017081476 A JP2017081476 A JP 2017081476A JP 2017081476 A JP2017081476 A JP 2017081476A JP 6496771 B2 JP6496771 B2 JP 6496771B2
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- 238000004519 manufacturing process Methods 0.000 title claims description 55
- 238000003825 pressing Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 description 16
- 238000010438 heat treatment Methods 0.000 description 11
- 238000001816 cooling Methods 0.000 description 7
- 238000012545 processing Methods 0.000 description 6
- 239000000498 cooling water Substances 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
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Description
本発明は、ダプルピニオン式電動パワーステアリング等に用いられるラックバーを製造するためのラック製造装置及びラック製造方法に関する。 The present invention relates to a rack manufacturing apparatus and a rack manufacturing method for manufacturing a rack bar used for a double pinion type electric power steering or the like.
電動パワーステアリング装置に用いられるラックピニオン機構は、ラック＆ピニオンが１箇所に設けられている形式（以下、「シングルピニオン式」と称する）と、ラック＆ピニオンが２箇所に設けられ、ＥＰＳ（電動パワ−ステアリング）用ラックバーを用いる形式（以下、「ダプルピニオン」と称する）とが知られている（例えば、特許文献１参照）。 The rack and pinion mechanism used in the electric power steering apparatus includes a rack and pinion provided in one place (hereinafter referred to as “single pinion type”), and a rack and pinion provided in two places. A type using a power steering rack bar (hereinafter referred to as “double pullion”) is known (see, for example, Patent Document 1).
シングルピニオン式に用いられる中空ラックバーでは、ラック歯部を形成するために、マンドレルを用いた鍛造加工を行っていた。 In a hollow rack bar used for a single pinion type, forging using a mandrel has been performed in order to form a rack tooth portion.
ダプルピニオン式に用いられる中空ラックバーでは、歯部の回転方向の位相差の設定を、平潰し加工する工程においてＮＣ制御で行っていた。 In the hollow rack bar used for the double pinion type, the phase difference in the rotation direction of the tooth portion is set by NC control in the flattening process.
上述したダプルピニオン式に用いられるラックバーでは、次のような問題があった。すなわち、中空ラックバーの場合、歯部の回転方向の位相差をＮＣ制御等で平潰しする時点で決めても後加工の歯成形や熱処理で位相や真直度が狂ってしまう虞があった。 The rack bar used in the above-described double pinion type has the following problems. That is, in the case of the hollow rack bar, even if the phase difference in the rotation direction of the tooth portion is determined at the time of flattening by NC control or the like, there is a possibility that the phase or straightness may be changed by post-processing tooth forming or heat treatment.
そこで本発明は、２箇所の歯部の位置が高精度に設定されたラックを製造できるラック製造装置及びラック製造方法を提供することを目的としている。 Therefore, an object of the present invention is to provide a rack manufacturing apparatus and a rack manufacturing method capable of manufacturing a rack in which the positions of two tooth portions are set with high accuracy.
前記課題を解決し目的を達成するために、本発明のラック製造装置及びラック製造方法は次のように構成されている。 In order to solve the problems and achieve the object, the rack manufacturing apparatus and the rack manufacturing method of the present invention are configured as follows.
互いに軸方向に離間し、第１歯部を有する第１軸部と第２歯部を有する第２軸部とが直線状に一体に形成された中空ラックバーにおける前記第１軸部と前記第２軸部との軸心線の矯正を行うラック製造装置において、前記中空ラックバーの前記第１軸部側を支持する第１支持部と、前記中空ラックバーの前記第２軸部側を支持する第２支持部と、前記第１支持部と前記第２支持部との中間位置を前記軸心線に交差する向きに押圧する押圧機構とを備え、前記第１支持部、前記第２支持部、前記押圧機構は、前記軸心線に沿って移動可能に形成されていることを特徴とする。 The first shaft portion and the first shaft portion in the hollow rack bar that are axially spaced apart from each other and in which a first shaft portion having a first tooth portion and a second shaft portion having a second tooth portion are integrally formed linearly. In a rack manufacturing apparatus that corrects an axial center line with two shaft portions, a first support portion that supports the first shaft portion side of the hollow rack bar and a second shaft portion side of the hollow rack bar are supported. second support and, prior Symbol e Bei a pressing mechanism for pressing in a direction intersecting the axial line between positions within the said first supporting part and the second supporting portion, wherein the first support portion, wherein The second support part and the pressing mechanism are formed to be movable along the axis .
互いに軸方向に離間し、第１歯部を有する第１軸部と第２歯部を有する第２軸部とが直線状に一体に形成された中空ラックバーにおける前記第１軸部と前記第２軸部との軸心線の矯正を行うラック製造方法において、前記中空ラックバーの前記第１軸部側を第１支持部により支持し、前記中空ラックバーの前記第２軸部側を第２支持部により支持し、前記第１支持部と前記第２支持部との中間位置を前記軸心線に交差する向きに押圧し、前記軸心線方向に沿った異なる位置で前記中空ラックバーの前記第１軸部側を支持し、前記軸心線方向に沿った異なる位置で前記中空ラックバーの前記第２軸部側を支持し、前記第１支持部と前記第２支持部との中間位置を前記軸心線に交差する向きに押圧することを特徴とする。 The first shaft portion and the first shaft portion in the hollow rack bar that are axially spaced apart from each other and in which a first shaft portion having a first tooth portion and a second shaft portion having a second tooth portion are integrally formed linearly. In the rack manufacturing method for correcting the axial center line with the two shaft portions, the first shaft portion side of the hollow rack bar is supported by a first support portion , and the second shaft portion side of the hollow rack bar is moved to the second position. 2 by a support part , pressing an intermediate position between the first support part and the second support part in a direction crossing the axis line, and the hollow rack bar at a different position along the axis line direction. The first shaft portion side of the hollow rack bar is supported at different positions along the axial center line direction, and the first support portion and the second support portion The intermediate position is pressed in a direction crossing the axis.
本発明によれば、２箇所の歯部の位置が高精度に設定されたラックを製造することが可能となる。 According to the present invention, it is possible to manufacture a rack in which the positions of two tooth portions are set with high accuracy.
図１は、本発明の第１の実施の形態に係るダブルピニオンラック製造装置（ラック製造装置）１００によって製造されたダブルピニオンラックバー１２が組み込まれたラック＆ピニオン装置を示す説明図、図２はラック製造装置１００を一部切欠して示す側面図、図３〜図５はダプルピニオンラックバーの位相測定方法を示す説明図、図６〜図１１は、ラック製造装置１００によるダプルピニオンラックバーの位相矯正工程を示す説明図である。 FIG. 1 is an explanatory view showing a rack and pinion device in which a double pinion rack bar 12 manufactured by a double pinion rack manufacturing device (rack manufacturing device) 100 according to the first embodiment of the present invention is incorporated. Is a side view showing the rack manufacturing apparatus 100 with a part cut away, FIGS. 3 to 5 are explanatory diagrams showing a phase measuring method of a double pinion rack bar, and FIGS. 6 to 11 are double pinions by the rack manufacturing apparatus 100. It is explanatory drawing which shows the phase correction process of a rack bar.
図１に示すように、ラック＆ピニオン装置１０は、車両の左右方向に延設された略円筒状のラックハウジング１１を有し、そのラックハウジング１１内にダブルピニオンラックバー１２が左右軸方向に摺動自在に収容されている。 As shown in FIG. 1, the rack and pinion device 10 includes a substantially cylindrical rack housing 11 that extends in the left-right direction of the vehicle, and a double pinion rack bar 12 extends in the left-right axial direction in the rack housing 11. It is slidably accommodated.
なお、ダブルピニオンラックバー１２は、図２に示すように、軸心線を一致させて一体に形成されると共に、軸方向に離間した第１軸部１２Ａと第２軸部１２Ｂとを有し、第１軸部１２Ａに第１歯部（ラック歯）１２ａが形成され、第２軸部１２Ｂに第２歯部（ラック歯）１２ｂが形成された中空ラックバーである。なお、第１軸部１２Ａと第２軸部１２Ｂとの中間にある部位を中間部位１２Ｃとする。中間部位１２Ｃには歯部が設けられていない。また、図２中Ｑは軸心線を示している。 As shown in FIG. 2, the double pinion rack bar 12 has a first shaft portion 12A and a second shaft portion 12B that are integrally formed with their axial centers aligned and are spaced apart in the axial direction. A hollow rack bar in which a first tooth portion (rack tooth) 12a is formed on the first shaft portion 12A and a second tooth portion (rack tooth) 12b is formed on the second shaft portion 12B. Note that an intermediate portion between the first shaft portion 12A and the second shaft portion 12B is referred to as an intermediate portion 12C. The intermediate portion 12C is not provided with a tooth portion. Further, Q in FIG. 2 indicates an axial center line.
ラックハウジング１１の両端開口から突出したダブルピニオンラックバー１２の両端部にそれぞれジョイントを介してタイロッド１３，１３が連結され、ジョイント部を覆うブーツ１４，１４からタイロッド１３，１３が側方に突出しており、ダブルピニオンラックバー１２の移動によりタイロッド１３，１３が動かされ、さらに転舵機構を介して車両の転舵輪が転舵される。 Tie rods 13 and 13 are connected to both ends of the double pinion rack bar 12 protruding from both ends of the rack housing 11 via joints, and the tie rods 13 and 13 protrude laterally from boots 14 and 14 covering the joint. The tie rods 13, 13 are moved by the movement of the double pinion rack bar 12, and the steered wheels of the vehicle are steered via the steered mechanism.
ラックハウジング１１の右端部にステアリングギヤボックス２０が設けられている。ステアリングギヤボックス２０には、ステアリングホイールが一体的に取り付けられたステアリング軸にジョイントを介して連結される入力軸２１が軸受を介して回動自在に軸支されている。入力軸２１には操舵ピニオン（不図示）が形成されている。 A steering gear box 20 is provided at the right end of the rack housing 11. In the steering gear box 20, an input shaft 21 connected via a joint to a steering shaft to which a steering wheel is integrally attached is pivotally supported via a bearing. A steering pinion (not shown) is formed on the input shaft 21.
この操舵ピニオンがダブルピニオンラックバー１２の第１歯部１２ａと噛合している。したがってステアリングホイールの回動操作により入力軸２１に伝達された操舵力は操舵ピニオンを回動して操舵ピニオンのはす歯と第１歯部１２ａの噛合によりダブルピニオンラックバー１２を左右軸方向に摺動させる。 The steering pinion meshes with the first tooth portion 12 a of the double pinion rack bar 12. Therefore, the steering force transmitted to the input shaft 21 by the turning operation of the steering wheel turns the steering pinion, and the double pinion rack bar 12 is moved in the left-right axial direction by meshing the helical teeth of the steering pinion and the first tooth portion 12a. Slide.
ラックハウジング１１の左端部には、補助ギヤボックス３０が形成されている。補助ギヤボックス３０は、ラックハウジング１１に対して若干傾いて上下方向にピニオン円筒部３１が形成されるとともに上下方向に直交するようにラックガイド円筒部３２が形成されている。 An auxiliary gear box 30 is formed at the left end of the rack housing 11. The auxiliary gear box 30 is slightly inclined with respect to the rack housing 11, a pinion cylindrical portion 31 is formed in the vertical direction, and a rack guide cylindrical portion 32 is formed so as to be orthogonal to the vertical direction.
ピニオン円筒部３１の内部にダブルピニオンラックバー１２の第２歯部１２ｂに噛合して補助ピニオン（不図示）が収容されている。補助ギアボックス３０には、モータ３３が取り付けられ、モータ３３の駆動軸が補助ピニオンを一体に回動し、補助ピニオンのはす歯が第２歯部１２ｂと噛み合うダブルピニオンラックバー１２を左右軸方向に摺動するように作用する。 An auxiliary pinion (not shown) is accommodated inside the pinion cylindrical portion 31 so as to mesh with the second tooth portion 12 b of the double pinion rack bar 12. A motor 33 is attached to the auxiliary gear box 30, the drive shaft of the motor 33 rotates the auxiliary pinion integrally, and the double pinion rack bar 12 in which the helical teeth of the auxiliary pinion mesh with the second tooth portion 12 b moves the left and right axes. Acts to slide in the direction.
モータ３３は、入力軸２１により検出したステアリングホイールの操舵トルクに応じて制御され、人力による操舵力が操舵ピニオンを介してダブルピニオンラックバー１２に伝達される一方で、その操舵トルクに応じて制御されるモータ３３による駆動力が補助ピニオンを介して同じダブルピニオンラックバー１２に作用し、人力を補助して転舵が行われる。 The motor 33 is controlled according to the steering torque of the steering wheel detected by the input shaft 21, and the steering force by human power is transmitted to the double pinion rack bar 12 via the steering pinion, while being controlled according to the steering torque. The driving force generated by the motor 33 acts on the same double pinion rack bar 12 through the auxiliary pinion, and the steering is performed with the assistance of human power.
図２に示すように、ラック製造装置１００は、ベース台１０１と、このベース１０１の一端側に取り付けられた固定機構１１０と、ベース１０１の他端側に取り付けられた回転機構１２０と、これら固定機構１１０と回転機構１２０との間に設けられた加熱・冷却部１３０とを備えている。 As shown in FIG. 2, the rack manufacturing apparatus 100 includes a base base 101, a fixing mechanism 110 attached to one end side of the base 101, a rotating mechanism 120 attached to the other end side of the base 101, and these fixings. A heating / cooling unit 130 provided between the mechanism 110 and the rotating mechanism 120 is provided.
固定機構１１０は、架台本体１１１と、この架台本体１１１の天井部及び床面部に設けられ、上下方向に往復動する固定パッド１１２，１１３とを備えている。 The fixing mechanism 110 includes a gantry body 111 and fixing pads 112 and 113 that are provided on the ceiling and floor surface of the gantry body 111 and reciprocate in the vertical direction.
回転機構１２０は、架台本体１２１と、この架台本体１２１から水平方向に延設された一対のアーム１２２，１２３と、これらアーム１２２，１２３の先端からそれぞれ上下方向に往復動する把持パッド１２４，１２５と、架台本体１２１から水平方向に往復動する軸固定金具１２６とを備えている。なお、アーム１２２，１２３は軸心線Ｑ周りに回動する機能を有している。 The rotation mechanism 120 includes a gantry body 121, a pair of arms 122 and 123 extending in a horizontal direction from the gantry body 121, and grip pads 124 and 125 that reciprocate vertically from the tips of the arms 122 and 123, respectively. And a shaft fixing fitting 126 that reciprocates horizontally from the gantry body 121. The arms 122 and 123 have a function of rotating around the axis Q.
加熱・冷却部１３０は、中間部位１２Ｃを取り囲むように配置され、高周波誘導コイルや冷却水吹出孔とが設けられた加熱・冷却リング１３１を有し、加熱・冷却を行う機能を有している。 The heating / cooling unit 130 is disposed so as to surround the intermediate portion 12C, and includes a heating / cooling ring 131 provided with a high-frequency induction coil and a cooling water blowing hole, and has a function of performing heating / cooling. .
このように構成されたラック製造装置１００では、次のようにしてダブルピニオンラックバー１２の回転位相設定を行う。すなわち、図３に示すように、予め高精度に回転位相が設定されたマスターラックバー（ゲージ）Ｇを用意し、第１歯部１２ａをチャッキング機構Ｍを用いて精度よくチャックする。次に、図４に示すように、第２歯部１２ｂにエンコーダＥを用いて、第２歯部１２ｂの第１歯部１２ａに対する正しい回転位相差δを測定する。 In the rack manufacturing apparatus 100 configured as described above, the rotational phase of the double pinion rack bar 12 is set as follows. That is, as shown in FIG. 3, a master rack bar (gauge) G whose rotational phase is set with high accuracy in advance is prepared, and the first tooth portion 12 a is chucked with high accuracy using the chucking mechanism M. Next, as shown in FIG. 4, using the encoder E for the second tooth portion 12b, the correct rotational phase difference δ of the second tooth portion 12b with respect to the first tooth portion 12a is measured.
次に、図５に示すように、実際に回転位相を設定するための測定するダブルピニオンラックバー１２を用意する。このダブルピニオンラックバー１２には、既に所定の加工・処理が完了している。この状態で、図３，４と同様にして回転位相差を測定し、所望の回転位相差δとの差分を算出する。 Next, as shown in FIG. 5, a double pinion rack bar 12 to be measured for actually setting the rotational phase is prepared. The double pinion rack bar 12 has already been subjected to predetermined processing and processing. In this state, the rotational phase difference is measured in the same manner as in FIGS. 3 and 4, and the difference from the desired rotational phase difference δ is calculated.
次に、図６に示すように、ラック製造装置１００に移載し、固定機構１１０で第１軸部１２Ａを固定パッド１１２，１１３により固定する。次に、図７に示すようにして、中間部位１２Ｃを加熱・冷却リング１３１で所定温度まで加熱する。そして、図８に示すようにして、把持パッド１２４，１２５により、第２軸部１２Ｂを把持する。次に、図９に示すように、アーム１２２，１２３を回動させ、把持パッド１２４，１２５を介して所望の回転位相差δとの差分だけ第２軸部１２Ｂを軸心線Ｑ周りに回動して、所望の回転位相差に設定する。 Next, as shown in FIG. 6, it is transferred to the rack manufacturing apparatus 100, and the first shaft portion 12 </ b> A is fixed by the fixing pads 112 and 113 by the fixing mechanism 110. Next, as shown in FIG. 7, the intermediate portion 12 </ b> C is heated to a predetermined temperature by the heating / cooling ring 131. Then, as shown in FIG. 8, the second shaft portion 12 </ b> B is gripped by the grip pads 124 and 125. Next, as shown in FIG. 9, the arms 122 and 123 are rotated, and the second shaft portion 12B is rotated about the axis Q through the grip pads 124 and 125 by a difference from the desired rotational phase difference δ. To set the desired rotational phase difference.
続いて、図１０に示すようにして、冷却水を噴出して急冷して中間部位１２Ｃの焼入れを行う。そして、図１１に示すように、所定の温度で焼鈍を行って完了する。 Subsequently, as shown in FIG. 10, the cooling water is jetted out and rapidly cooled to quench the intermediate portion 12C. Then, as shown in FIG. 11, annealing is performed at a predetermined temperature to complete.
このようなラック製造装置１００であれば、歯部の形成等の加工工程を終えてから、回転位相差を設定することができるので、回転位相差を所望の値に高精度に設定できる。また、中間部位１２Ｃは加熱後に急冷して焼入れをしているので、強度が向上することとなる。 With such a rack manufacturing apparatus 100, the rotational phase difference can be set after finishing the processing steps such as the formation of the tooth portion, so that the rotational phase difference can be set to a desired value with high accuracy. Further, since the intermediate portion 12C is quenched and quenched after heating, the strength is improved.
図１２〜図１４は、本発明の第２の実施の形態に係るラック製造装置２００によるダプルピニオンラックバーの直線度矯正工程を示す説明図である。 FIGS. 12-14 is explanatory drawing which shows the straightness correction process of the double pinion rack bar by the rack manufacturing apparatus 200 which concerns on the 2nd Embodiment of this invention.
ラック製造装置２００の真直度矯正の対象となるダブルピニオンラックバー１２は、上述したダブルピニオンラックバー１２と同じものであり、互いに軸方向に離間し、第１歯部１２ａを有する第１軸部１２Ａと、第２歯部１２ｂを有する第２軸部１２Ｂとが直線状に一体に形成されている。なお、中間部位１２Ｃも同様に形成されている。 The double pinion rack bar 12 to be straightened by the rack manufacturing apparatus 200 is the same as the double pinion rack bar 12 described above, and is separated from each other in the axial direction and has a first shaft portion having a first tooth portion 12a. 12A and the 2nd axial part 12B which has the 2nd tooth part 12b are integrally formed in linear form. The intermediate portion 12C is formed in the same manner.
ラック製造装置２００は、ベース部２１０と、ベース部２１０の一端側に設けられ、ダブルピニオンラックバー１２の第１軸部１２Ａ側を支持する第１支持部２２０と、ベース部２１０の他端側に設けられ、ダブルピニオンラックバー１２の第２軸部１２Ｂ側を支持する第２支持部２３０と、中間部位１２Ｃを軸心線Ｑに交差する向きに押圧する押圧機構２４０とを備えている。 The rack manufacturing apparatus 200 includes a base portion 210, a first support portion 220 provided on one end side of the base portion 210 and supporting the first shaft portion 12 </ b> A side of the double pinion rack bar 12, and the other end side of the base portion 210. And a second support portion 230 that supports the second shaft portion 12B side of the double pinion rack bar 12 and a pressing mechanism 240 that presses the intermediate portion 12C in a direction crossing the axis Q.
このように構成されたラック製造装置２００では、次のようにしてダブルピニオンラックバー１２の真直度矯正を行う。すなわち、中間部位１２Ｃの中央を矯正したい場合には、図１２に示すようにして、第１支持部２２０にて第１軸部１２Ａ、第２支持部２３０にて第２軸部１２Ｂを中間部位１２Ｃ寄りで支持する。そして押圧機構２４０により、上方から押圧し、ダブルピニオンラックバー１２の真直度を矯正する。 In the rack manufacturing apparatus 200 configured as described above, straightness correction of the double pinion rack bar 12 is performed as follows. That is, when it is desired to correct the center of the intermediate portion 12C, as shown in FIG. 12, the first shaft portion 12A is used as the first support portion 220 and the second shaft portion 12B is used as the intermediate portion as the second support portion 230 as shown in FIG. Support at 12C. And it presses from upper direction with the press mechanism 240, and corrects the straightness of the double pinion rack bar 12. FIG.
また、中間部位１２Ｃの第１軸部１２Ａ寄りを矯正したい場合には、図１３に示すようにして、第１支持部２２０にて第１軸部１２Ａの端部側、第２支持部２３０にて第２軸部１２Ｂを中間部位１２Ｃ寄りで支持する。そして押圧機構２４０により、上方から押圧し、ダブルピニオンラックバー１２の真直度を矯正する。 Also, when it is desired to correct the intermediate portion 12C closer to the first shaft portion 12A, as shown in FIG. 13, the first support portion 220 has an end portion side of the first shaft portion 12A and the second support portion 230. The second shaft portion 12B is supported near the intermediate portion 12C. And it presses from upper direction with the press mechanism 240, and corrects the straightness of the double pinion rack bar 12. FIG.
さらに、中間部位１２Ｃの第２軸部１２Ｂ寄りを矯正したい場合には、図１４に示すようにして、第１支持部２２０にて第１軸部１２Ａの中間部位１２Ｃ寄り、第２支持部２３０にて第２軸部１２Ｂの端部側で支持する。そして押圧機構２４０により、上方から押圧し、ダブルピニオンラックバー１２の真直度を矯正する。 Furthermore, when it is desired to correct the intermediate portion 12C closer to the second shaft portion 12B, the first support portion 220 moves closer to the intermediate portion 12C of the first shaft portion 12A and the second support portion 230 as shown in FIG. Is supported on the end side of the second shaft portion 12B. And it presses from upper direction with the press mechanism 240, and corrects the straightness of the double pinion rack bar 12. FIG.
上述したように、ラック製造装置１００及びラック製造装置２００により、歯成形や熱処理で位相や直線度が狂ってしまった場合であっても、ダブルピニオンラックバー１２の回転位相差の矯正、及び、直線度の矯正を行うことで、第１歯部１２ａ及び第２歯部１２ｂの円周方向の位置精度や同軸性・真直性を高い精度で確保することができる。このため、第１歯部１２ａ及び第２歯部１２ｂとピニオンギアとの噛み合いを滑らかにすることができる。したがって、電動パワーステアリング装置には適したものを形成できる。 As described above, even if the rack manufacturing apparatus 100 and the rack manufacturing apparatus 200 cause the phase or linearity to be out of order due to tooth forming or heat treatment, correction of the rotational phase difference of the double pinion rack bar 12, and By correcting the straightness, it is possible to ensure the positional accuracy, coaxiality, and straightness of the first tooth portion 12a and the second tooth portion 12b in the circumferential direction with high accuracy. For this reason, meshing of the first tooth portion 12a and the second tooth portion 12b and the pinion gear can be made smooth. Therefore, a suitable electric power steering device can be formed.
なお、本発明は前記実施の形態に限定されるものではない。上述した例では、塑性加工・熱処理等が完了した後に矯正を行っているが、各加工・処理を行っている途中で矯正を行ってもよく、その回数は１回に限られない。この他、本発明の要旨を逸脱しない範囲で種々変形実施可能であるのは勿論である。
以下に、本願出願の当初の特許請求の範囲に記載された発明を付記する。
［１］軸心線を一致させて一体に形成されると共に、軸方向に離間した第１軸部と第２軸部とを有し、前記第１軸部に第１歯部が形成され、前記第２軸部に第２歯部が形成された中空ラックバーにおける前記軸心線周りの前記第１歯部と前記第２歯部との相対的な位相を設定するラック製造装置において、前記第１軸部を固定する固定部と、前記第２軸部を把持する把持部と、前記第１歯部と前記第２歯部との中間位置を加熱する加熱部と、前記把持部を前記軸心線周りに回動させる回動機構とを備えているラック製造装置。
［２］前記第１歯部と前記第２歯部との間の位置を冷却する冷却部をさらに備えている［１］に記載のラック製造装置。
［３］互いに軸方向に離間し、第１歯部を有する第１軸部と第２歯部を有する第２軸部とが直線状に一体に形成された中空ラックバーにおける前記第１軸部と前記第２軸部との軸心線の矯正を行うラック製造装置において、前記中空ラックバーの前記第１軸部側を支持する第１支持部と、前記中空ラックバーの前記第２軸部側を支持する第２支持部と、前記中間位置を前記軸心線に交差する向きに押圧する押圧機構とを備えていラック製造装置。
［４］軸心線を一致させて一体に形成されると共に、軸方向に離間した第１軸部と第２軸部とを有し、前記第１軸部に第１歯部が形成され、前記第２軸部に第２歯部が形成された中空ラックバーにおける前記軸心線周りの前記第１歯部と前記第２歯部との相対的な位相を設定するラック製造方法において、前記第１軸部を固定部で固定し、前記第１歯部と前記第２歯部との中間位置を加熱し、前記第２軸部を把持部で把持し、前記把持部を前記軸心線周りに回動させるラック製造方法。
［５］前記第１歯部と前記第２歯部との間の位置を冷却する［４］記載のラック製造方法。
［６］軸心線を一致させて一体に形成されると共に、軸方向に離間した第１軸部と第２軸部とを有し、前記第１軸部に第１歯部が形成され、前記第２軸部に第２歯部が形成された中空ラックバーにおける前記軸心線周りの前記第１歯部と前記第２歯部との相対的な位相を設定するラック製造方法において、互いに軸方向に離間し、第１歯部を有する第１軸部と第２歯部を有する第２軸部とが直線状に一体に形成された中空ラックバーにおける前記第１軸部と前記第２軸部との軸心線の矯正を行うラック製造方法において、前記中空ラックバーの前記第１軸部側を支持し、前記中空ラックバーの前記第２軸部側を支持し、前記中間位置を前記軸心線に交差する向きに押圧するラック製造方法。
The present invention is not limited to the above embodiment. In the above-described example, correction is performed after plastic processing / heat treatment or the like is completed. However, correction may be performed during each processing / processing, and the number of times is not limited to one. Of course, various modifications can be made without departing from the scope of the present invention .
Hereinafter, the invention described in the scope of claims of the present application will be appended.
[1] The first shaft portion and the second shaft portion, which are integrally formed with the axial center lines aligned with each other and spaced apart in the axial direction, have a first tooth portion formed on the first shaft portion, In the rack manufacturing apparatus for setting a relative phase between the first tooth portion and the second tooth portion around the axial center line in a hollow rack bar in which a second tooth portion is formed on the second shaft portion, A fixing portion that fixes the first shaft portion; a gripping portion that grips the second shaft portion; a heating portion that heats an intermediate position between the first tooth portion and the second tooth portion; The rack manufacturing apparatus provided with the rotation mechanism rotated around an axis line.
[2] The rack manufacturing apparatus according to [1], further including a cooling unit that cools a position between the first tooth part and the second tooth part.
[3] The first shaft portion in the hollow rack bar that is axially separated from each other, and the first shaft portion having the first tooth portion and the second shaft portion having the second tooth portion are integrally formed linearly. In the rack manufacturing apparatus for correcting the axial center line between the first rack portion and the second shaft portion, a first support portion that supports the first shaft portion side of the hollow rack bar, and the second shaft portion of the hollow rack bar. A rack manufacturing apparatus, comprising: a second support portion that supports the side; and a pressing mechanism that presses the intermediate position in a direction that intersects the axis.
[4] The shaft center line is formed integrally and has a first shaft portion and a second shaft portion separated in the axial direction, and a first tooth portion is formed on the first shaft portion, In the rack manufacturing method for setting a relative phase between the first tooth portion and the second tooth portion around the axial center line in a hollow rack bar in which a second tooth portion is formed on the second shaft portion, The first shaft portion is fixed by the fixing portion, the intermediate position between the first tooth portion and the second tooth portion is heated, the second shaft portion is gripped by the grip portion, and the grip portion is held by the axis. A rack manufacturing method that rotates around.
[5] The rack manufacturing method according to [4], wherein a position between the first tooth portion and the second tooth portion is cooled.
[6] The first shaft portion and the second shaft portion, which are integrally formed with the axial center lines aligned, are separated in the axial direction, and the first tooth portion is formed on the first shaft portion, In a rack manufacturing method for setting a relative phase between the first tooth portion and the second tooth portion around the axial center line in a hollow rack bar in which a second tooth portion is formed on the second shaft portion, The first shaft portion and the second shaft in a hollow rack bar that are spaced apart in the axial direction and in which a first shaft portion having a first tooth portion and a second shaft portion having a second tooth portion are integrally formed linearly. In the rack manufacturing method for correcting the shaft center line with the shaft portion, the first shaft portion side of the hollow rack bar is supported, the second shaft portion side of the hollow rack bar is supported, and the intermediate position is set. A rack manufacturing method for pressing in a direction crossing the axis.
１０…ラック＆ピニオン装置、１２…ダブルピニオンラックバー、１２ａ…第１歯部、１２ｂ…第２歯部、１２Ａ…第１軸部、１２Ｂ…第２軸部、１２Ｃ…中間部位、１００…ラック製造装置、１１０…固定機構、１２０…回転機構、１３０…加熱・冷却部、２００…ラック製造装置、２２０…第１支持部、２３０…第２支持部、２４０…押圧機構。 DESCRIPTION OF SYMBOLS 10 ... Rack & pinion apparatus, 12 ... Double pinion rack bar, 12a ... 1st tooth part, 12b ... 2nd tooth part, 12A ... 1st axial part, 12B ... 2nd axial part, 12C ... Intermediate part, 100 ... Rack Manufacturing apparatus, 110 ... fixing mechanism, 120 ... rotating mechanism, 130 ... heating / cooling section, 200 ... rack manufacturing apparatus, 220 ... first support section, 230 ... second support section, 240 ... pressing mechanism.
Claims (2)
前記中空ラックバーの前記第１軸部側を支持する第１支持部と、
前記中空ラックバーの前記第２軸部側を支持する第２支持部と、
前記第１支持部と前記第２支持部との中間位置を前記軸心線に交差する向きに押圧する押圧機構とを備え、
前記第１支持部、前記第２支持部、前記押圧機構は、前記軸心線に沿って移動可能に形成されていることを特徴とするラック製造装置。 The first shaft portion and the first shaft portion in the hollow rack bar that are axially spaced apart from each other and in which a first shaft portion having a first tooth portion and a second shaft portion having a second tooth portion are integrally formed linearly. In the rack manufacturing apparatus that corrects the axial center line with the two shaft parts,
A first support portion for supporting the first shaft portion side of the hollow rack bar;
A second support part for supporting the second shaft part side of the hollow rack bar;
Before Stories example Bei a pressing mechanism for pressing in a direction intersecting the axial line between positions within the said first supporting part and the second supporting portion,
The rack manufacturing apparatus , wherein the first support part, the second support part, and the pressing mechanism are formed to be movable along the axis .
前記中空ラックバーの前記第１軸部側を第１支持部により支持し、
前記中空ラックバーの前記第２軸部側を第２支持部により支持し、
前記第１支持部と前記第２支持部との中間位置を前記軸心線に交差する向きに押圧し、
前記軸心線方向に沿った異なる位置で前記中空ラックバーの前記第１軸部側を支持し、
前記軸心線方向に沿った異なる位置で前記中空ラックバーの前記第２軸部側を支持し、
前記第１支持部と前記第２支持部との中間位置を前記軸心線に交差する向きに押圧することを特徴とするラック製造方法。 The first shaft portion and the first shaft portion in the hollow rack bar that are axially spaced apart from each other and in which a first shaft portion having a first tooth portion and a second shaft portion having a second tooth portion are integrally formed linearly. In the rack manufacturing method for correcting the axial center line with the two shaft portions,
Said first shaft portion of the hollow rack asked to support the first support portion,
Said second shaft portion of the hollow rack asked to support the second support portion,
Pressing an intermediate position between the first support part and the second support part in a direction crossing the axial center line;
Supporting the first shaft portion side of the hollow rack bar at different positions along the axial direction,
Supporting the second shaft portion side of the hollow rack bar at different positions along the axial direction,
The rack manufacturing method characterized by pressing the intermediate position of the said 1st support part and the said 2nd support part in the direction which cross | intersects the said axial center line.
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