JPWO2020008604A1 - Rack gear mounting structure and rack gear - Google Patents

Rack gear mounting structure and rack gear Download PDF

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JPWO2020008604A1
JPWO2020008604A1 JP2020528637A JP2020528637A JPWO2020008604A1 JP WO2020008604 A1 JPWO2020008604 A1 JP WO2020008604A1 JP 2020528637 A JP2020528637 A JP 2020528637A JP 2020528637 A JP2020528637 A JP 2020528637A JP WO2020008604 A1 JPWO2020008604 A1 JP WO2020008604A1
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rack
rack gear
body member
groove
length direction
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JP7019277B2 (en
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山田　雄大
雄大 山田
啓 長井
啓 長井
小野　泰史
泰史 小野
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Harmonic Drive Systems Inc
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    • 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
    • F16H19/00—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion
    • F16H19/02—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion for interconverting rotary or oscillating motion and reciprocating motion
    • F16H19/04—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion for interconverting rotary or oscillating motion and reciprocating motion comprising a rack
    • 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

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)
  • Gears, Cams (AREA)

Abstract

ラックギヤ（７）をラック取付け面（８）に取り付けるラックギヤ取付け構造では、ラックギヤ（７）のラック本体部材（１１）には、複数条の溝（１３）が形成されている。溝（１３）は、ラック本体部材（１１）において、ラック歯列（１２）が形成されている部分を除き、ラック本体部材（１１）を、その長さ方向（１１ａ）に沿って、所定の間隔で分断している。ラックギヤ（７）をラック取付け面（８）に締結固定すると、ラックギヤ（７）に加わる締結力によって、ラックギヤ（７）の変形が確実に矯正された状態で、ラック取付け面（８）に取り付けられる。ラックギヤに大きな外力を加えて塑性変形させて、ラックギヤの変形を除去する工程等を必要とせずに、ラックギヤ（７）を精度良く加工でき、実機に精度良く組み付け可能である。In the rack gear mounting structure in which the rack gear (7) is mounted on the rack mounting surface (8), a plurality of grooves (13) are formed in the rack body member (11) of the rack gear (7). The groove (13) defines the rack body member (11) along the length direction (11a) of the rack body member (11), except for the portion where the rack dentition (12) is formed. It is divided at intervals. When the rack gear (7) is fastened and fixed to the rack mounting surface (8), the rack gear (7) is mounted on the rack mounting surface (8) in a state where the deformation of the rack gear (7) is surely corrected by the fastening force applied to the rack gear (7). .. The rack gear (7) can be machined with high accuracy without the need for a step of plastically deforming the rack gear by applying a large external force to remove the deformation of the rack gear, and it can be assembled to an actual machine with high accuracy.

Description

本発明は、ラック・ピニオン機構に関し、更に詳しくは、ラックギヤの取付け構造に関する。 The present invention relates to a rack and pinion mechanism, and more particularly to a rack gear mounting structure.

ラック・ピニオン機構の構成部品であるラックギヤは、その製造工程中に、反り・曲がり等の変形が生じる。例えば、焼入れ、焼き戻し等の熱処理工程等において、ラックギヤに変形が生じやすい。変形が生じると、その後のラックギヤの製造工程における加工精度が低下する。精度の低下を防止するために、外力を加えて、変形を矯正した状態で、ラックギヤを所定のラックギヤ取付け面に取り付け、この状態で、歯切り工程、研磨工程、検査工程などを行っている。また、ラックギヤに大きな力を加えて塑性変形させることで、ラックギヤの変形を除去して、実機に搭載している。 The rack gear, which is a component of the rack and pinion mechanism, undergoes deformation such as warping and bending during the manufacturing process. For example, in a heat treatment process such as quenching or tempering, the rack gear is likely to be deformed. When the deformation occurs, the processing accuracy in the subsequent rack gear manufacturing process is lowered. In order to prevent a decrease in accuracy, a rack gear is attached to a predetermined rack gear mounting surface in a state where deformation is corrected by applying an external force, and in this state, a gear cutting process, a polishing process, an inspection process, and the like are performed. Further, by applying a large force to the rack gear to plastically deform it, the deformation of the rack gear is removed and the rack gear is mounted on the actual machine.

特許文献１には、ステアリング装置に用いられるラック歯列が形成されたラックシャフトを塑性変形させて歪を除去する方法が提案されている。この方法では、ラックシャフトの両端部に比べて中央部分の断面積を小さくし、ラックシャフトの中央部分のラック歯列の部分に塑性変形用の力を加えて、ラックシャフトの反りを除去している。 Patent Document 1 proposes a method of removing strain by plastically deforming a rack shaft on which a rack dentition used in a steering device is formed. In this method, the cross-sectional area of the central portion is smaller than that of both ends of the rack shaft, and a force for plastic deformation is applied to the rack dentition portion of the central portion of the rack shaft to remove the warp of the rack shaft. There is.

特開２０１７−３２０７８号公報JP-A-2017-32078

ラックギヤは一般に剛性が高いので、外力を加えても変形を確実に矯正できない場合がある。この場合には、変形あるいは歪が部分的に残ったまま、ラックギヤに歯切り加工、研磨加工などが施されてしまう。また、変形あるいは歪が残ったまま、ラックギヤが実機に搭載され、ピニオンギヤとのかみ合いを適切な状態に維持できないなどの弊害が生じることがある。 Since rack gears generally have high rigidity, it may not be possible to reliably correct deformation even when an external force is applied. In this case, the rack gear is subjected to gear cutting, polishing, or the like while the deformation or distortion remains partially. In addition, the rack gear may be mounted on the actual machine while the deformation or distortion remains, and there may be an adverse effect such that the engagement with the pinion gear cannot be maintained in an appropriate state.

本発明の課題は、ラックギヤの製造工程あるいは使用時（実機搭載時）に、変形が確実に矯正された状態で、ラックギヤを所定のラックギヤ取付け面に取り付け可能なラックギヤ取付け構造を提供することにある。 An object of the present invention is to provide a rack gear mounting structure capable of mounting a rack gear on a predetermined rack gear mounting surface in a state where deformation is surely corrected during a rack gear manufacturing process or during use (when mounted on an actual machine). ..

上記の課題を解決するために、本発明は、外力を加えて変形が矯正された状態で、ラックギヤを所定のラックギヤ取付け面に取り付けるためのラックギヤ取付け構造であって、
前記ラックギヤは、
直線状に延びるラック本体部材と、
前記ラック本体部材の外周側面に、その長さ方向に形成したラック歯列と、
前記ラック本体部材における前記ラック歯列が形成されている部位とは異なる部位を、当該ラック本体部材の長さ方向に沿って、所定の間隔で分断している複数条の溝と、
を有していることを特徴としている。In order to solve the above problems, the present invention is a rack gear mounting structure for mounting a rack gear on a predetermined rack gear mounting surface in a state where deformation is corrected by applying an external force.
The rack gear
The rack body member that extends in a straight line and
A rack dentition formed on the outer peripheral side surface of the rack body member in the length direction thereof,
A plurality of grooves in the rack main body member, which are different from the portion where the rack dentition is formed, are divided at predetermined intervals along the length direction of the rack main body member.
It is characterized by having.

ラックギヤの加工時、実機に搭載する時には、ボルト等の締結具を用いて、ラックギヤが、基準となるラックギヤ取付け面に締結固定される。複数条の溝を設けて剛性を低下させたラックギヤは、締結具による外力が加わると、比較的容易に変形する。よって、変形が確実に矯正された状態で、ラックギヤをラックギヤ取付け面に締結固定できる。この状態で、歯切り加工、研磨加工等を行うことで、精度良くラックギヤを製造できる。 When processing the rack gear or mounting it on the actual machine, the rack gear is fastened and fixed to the reference rack gear mounting surface using fasteners such as bolts. A rack gear whose rigidity is reduced by providing a plurality of grooves is relatively easily deformed when an external force is applied by a fastener. Therefore, the rack gear can be fastened and fixed to the rack gear mounting surface in a state where the deformation is surely corrected. By performing gear cutting, polishing, etc. in this state, rack gears can be manufactured with high accuracy.

また、ラックギヤは、加工後に、ラックギヤ取付け面から取り外して外力が解除されると、変形した状態に戻る。しかし、次の工程において、外力を加えてラックギヤ取付け面に締結固定すると、前工程と同様に、変形が矯正された状態になる。よって、加工精度が維持される。 Further, when the rack gear is removed from the rack gear mounting surface after processing and the external force is released, the rack gear returns to the deformed state. However, in the next step, when an external force is applied to fasten and fix the rack gear mounting surface, the deformation is corrected as in the previous step. Therefore, the processing accuracy is maintained.

さらに、実機への搭載時においても、外力を加えて変形を確実に矯正した状態で、実機の側のラックギヤ取付け面に取り付けることができる。よって、ラックギヤを精度良く組み付けることができ、ピニオンギヤとのかみ合い状態も適切な状態に維持できる。また、大きな外力を加えて塑性変形させて変形を除去する工程を必要とせずに、ピニオンギヤを精度良く実機に搭載することも可能になる。 Further, even when it is mounted on the actual machine, it can be mounted on the rack gear mounting surface on the side of the actual machine in a state where the deformation is surely corrected by applying an external force. Therefore, the rack gear can be assembled with high accuracy, and the meshed state with the pinion gear can be maintained in an appropriate state. In addition, the pinion gear can be mounted on the actual machine with high accuracy without the need for a step of applying a large external force to plastically deform and remove the deformation.

本発明を適用した送り機構の例を示す説明図である。It is explanatory drawing which shows the example of the feed mechanism to which this invention is applied. 図１のラックギヤを示す説明図およびラックギヤの変形状態の一例を示す説明図である。It is explanatory drawing which shows the rack gear of FIG. 1, and is explanatory drawing which shows an example of the deformed state of a rack gear.

以下に、図面を参照して、本発明を適用したラックギヤ取付け構造の実施の形態を説明する。 Hereinafter, embodiments of a rack gear mounting structure to which the present invention is applied will be described with reference to the drawings.

図１はラック・ピニオン機構を備えた送り機構の一例を示す説明図である。送り機構においては、本発明を適用したラックギヤ取付け構造が用いられている。送り機構１は、回転アクチュエータ２と、ラック・ピニオン機構３とを備えている。回転アクチュエータ２は、モータ４と、モータ４の回転を減速して出力する減速機５とを備えている。ラック・ピニオン機構３は、回転アクチュエータ２の出力軸に同軸に取り付けたピニオンギヤ６と、ピニオンギヤ６とかみ合っているラックギヤ７と、ラックギヤ取付け面８が形成された機構フレーム９とを備えている。ラックギヤ７は、ラックギヤ取付け面８に、例えば締結ボルト１０によって締結固定されている。送り機構１にはラックギヤ取付け構造が備わっており、これにより、機構フレーム９のラック取付け面８に、締結ボルト１０の締結力によって、変形が矯正された状態でラックギヤ７が締結固定された状態が形成される。 FIG. 1 is an explanatory diagram showing an example of a feed mechanism provided with a rack and pinion mechanism. In the feed mechanism, a rack gear mounting structure to which the present invention is applied is used. The feed mechanism 1 includes a rotary actuator 2 and a rack and pinion mechanism 3. The rotary actuator 2 includes a motor 4 and a speed reducer 5 that decelerates and outputs the rotation of the motor 4. The rack and pinion mechanism 3 includes a pinion gear 6 coaxially attached to the output shaft of the rotary actuator 2, a rack gear 7 that meshes with the pinion gear 6, and a mechanism frame 9 on which a rack gear mounting surface 8 is formed. The rack gear 7 is fastened and fixed to the rack gear mounting surface 8 by, for example, fastening bolts 10. The feed mechanism 1 is provided with a rack gear mounting structure, whereby the rack gear 7 is fastened and fixed to the rack mounting surface 8 of the mechanism frame 9 in a state where the deformation is corrected by the fastening force of the fastening bolt 10. It is formed.

図２（ａ）は、ラックギヤ７を示す説明図である。ラックギヤ７は、真直に延びる矩形断面のラック本体部材１１を備えている。ラック本体部材１１の横断面形状は矩形断面に限定されるものではなく、多角形、円形断面であってもよい。ラック本体部材１１の外周側面には、その長さ方向１１ａにラック歯列１２が形成されている。ラック本体部材１１において、ラック歯列１２が形成されている部位とは異なる部位には、当該ラック本体部材１１の部位を、ラック本体部材１１の長さ方向１１ａに、所定の間隔で分断している複数条の溝１３が形成されている。 FIG. 2A is an explanatory view showing the rack gear 7. The rack gear 7 includes a rack body member 11 having a rectangular cross section that extends straight. The cross-sectional shape of the rack body member 11 is not limited to a rectangular cross section, and may be a polygonal or circular cross section. A rack dentition 12 is formed on the outer peripheral side surface of the rack body member 11 in the length direction 11a thereof. In the rack main body member 11, the portion of the rack main body member 11 is divided into a portion different from the portion where the rack dentition 12 is formed in the length direction 11a of the rack main body member 11 at a predetermined interval. A plurality of grooves 13 are formed.

矩形断面のラック本体部材１１における４つの平坦な外周側面を、第１〜第４側面２１〜２４と呼ぶものとする。本例では、第１側面２１にラック歯列１２が形成されている。ラック歯列１２においては、長さ方向１１ａに直交、または所定の角度を有する方向に延びる歯山が、長さ方向１１ａに、一定のピッチで配列されている。 The four flat outer peripheral side surfaces of the rack body member 11 having a rectangular cross section are referred to as the first to fourth side surfaces 21 to 24. In this example, the rack dentition 12 is formed on the first side surface 21. In the rack dentition 12, tooth ridges extending orthogonal to the length direction 11a or extending in a direction having a predetermined angle are arranged in the length direction 11a at a constant pitch.

複数条の溝１３は、第１側面２１とは反対側の第３側面２３において、長さ方向１１ａに沿って等間隔で配列されている。各溝１３は、長さ方向１１ａに直交する幅方向１１ｂに平行、または所定の角度を有して延びている。各溝１３は、ラック本体部材１１の第３側面２３に露出する一定幅の溝開口１３ａを備え、第３側面２３において、幅方向１１ｂの全幅に亘って形成され、その両側の溝端が、第２側面２２および第４側面２４に開口している。また、溝１３は、第３側面２３から、ラック歯列１２が形成されている第１側面に向かって、第３側面２３に垂直に延びる長方形断面をしている。本例の溝１３は、第３側面２３から第１側面２１までの間の距離の略半分の溝深さの溝であり、溝底面部分は湾曲円弧面によって規定されている。 The plurality of grooves 13 are arranged at equal intervals along the length direction 11a on the third side surface 23 opposite to the first side surface 21. Each groove 13 extends parallel to the width direction 11b orthogonal to the length direction 11a or at a predetermined angle. Each groove 13 is provided with a groove opening 13a having a constant width exposed on the third side surface 23 of the rack body member 11, and is formed on the third side surface 23 over the entire width in the width direction 11b, and the groove ends on both sides thereof are formed on the third side surface 23. It is open to the two side surfaces 22 and the fourth side surface 24. Further, the groove 13 has a rectangular cross section extending perpendicularly to the third side surface 23 from the third side surface 23 toward the first side surface on which the rack dentition 12 is formed. The groove 13 of this example is a groove having a groove depth of approximately half the distance between the third side surface 23 and the first side surface 21, and the groove bottom surface portion is defined by a curved arc surface.

ラックギヤ７は例えば次の工程を経て製造される。まず、ラック歯列１２および溝１３の付いていない矩形断面のラック本体部材１１を製造する。このラック本体部材１１に溝加工を行って溝１３を付ける。また、穴加工を行って締結ボルトの取付け穴１４等を付ける。次に、歯切り加工を行って、溝１３の付いたラック本体部材１１にラック歯列１２を付ける。ラック歯列１２の付いたラック本体部材１１のラック歯列１２に研磨工程および熱処理工程（焼入れ、焼きなまし等）を行う。 The rack gear 7 is manufactured, for example, through the following steps. First, a rack body member 11 having a rectangular cross section without a rack dentition 12 and a groove 13 is manufactured. Grooves are formed in the rack body member 11 to form a groove 13. In addition, holes are drilled to provide mounting holes 14 and the like for fastening bolts. Next, gear cutting is performed to attach the rack dentition 12 to the rack body member 11 having the groove 13. A polishing step and a heat treatment step (quenching, annealing, etc.) are performed on the rack tooth row 12 of the rack body member 11 having the rack tooth row 12.

例えば、研磨工程あるいは熱処理工程の前において、ラック歯列１２を付けたラック本体部材１１には変形が生じている。例えば、図２（ｂ）に示すように、長さ方向１１ａにおいて、ラック歯列１２が形成された第１側面２１の側が僅かに湾曲面となるように、ラック本体部材１１に変形が生じる。 For example, before the polishing step or the heat treatment step, the rack body member 11 to which the rack dentition 12 is attached is deformed. For example, as shown in FIG. 2B, the rack body member 11 is deformed so that the side of the first side surface 21 on which the rack dentition 12 is formed becomes a slightly curved surface in the length direction 11a.

本例のラックギヤ７には溝１３が形成されている。例えば、研磨加工用のラックギヤ取付け面（図示せず）に、締結機構によって、変形状態のラック本体部材１１が取り付けられる。締結機構によって外力を加えて変形が矯正された状態で、ラック本体部材１１がラックギヤ取付け面に取り付けられる。ラック本体部材１１の第３側面２３の側の部位は、長さ方向１１ａに沿って、溝１３によって、等間隔に分断されており、剛性が低い。外力を加えることで、変形が確実に矯正された状態でラックギヤ取付け面に取り付けられ、この状態で精度良く加工が行われる。 A groove 13 is formed in the rack gear 7 of this example. For example, the rack body member 11 in a deformed state is attached to the rack gear mounting surface (not shown) for polishing by a fastening mechanism. The rack body member 11 is attached to the rack gear mounting surface in a state where the deformation is corrected by applying an external force by the fastening mechanism. The portion of the rack body member 11 on the side of the third side surface 23 is divided at equal intervals by the grooves 13 along the length direction 11a, and has low rigidity. By applying an external force, it is attached to the rack gear mounting surface in a state where the deformation is surely corrected, and processing is performed with high accuracy in this state.

加工後にラックギヤ取付け面からラックギヤ７を取り外すと、外力が除去されるので、再び変形した状態に戻る。しかし、次の加工工程において、外力を加えることで変形が確実に矯正された状態が再現され、ラックギヤ７が精度良く加工される。 When the rack gear 7 is removed from the rack gear mounting surface after processing, the external force is removed, so that the state returns to the deformed state again. However, in the next processing step, the state in which the deformation is surely corrected by applying an external force is reproduced, and the rack gear 7 is processed with high accuracy.

また、ラックギヤ７の製造においては、外力を加えて塑性変形させて変形を除去する工程を省略することも可能である。この場合、変形が残っている状態のままで、ラックギヤ７が実機に取り付けられる。例えば、図１に示すように、機構フレーム９のラックギヤ取付け面８に、ラックギヤ７が締結ボルト１０等によって締結固定される。ラックギヤ７には溝１３が付いているので、締結ボルト１０の締結等によってラックギヤ７に加わる外力によって、ラックギヤ７の変形が確実に矯正される。よって、ラックギヤ７は、変形が矯正された状態で精度良くラックギヤ取付け面８に組み付けられ、ピニオンギヤ６に精度良くかみ合った状態を形成できる。 Further, in the manufacture of the rack gear 7, it is possible to omit the step of applying an external force to plastically deform the rack gear 7 to remove the deformation. In this case, the rack gear 7 is attached to the actual machine with the deformation remaining. For example, as shown in FIG. 1, the rack gear 7 is fastened and fixed to the rack gear mounting surface 8 of the mechanism frame 9 by fastening bolts 10 and the like. Since the rack gear 7 has a groove 13, the deformation of the rack gear 7 is surely corrected by an external force applied to the rack gear 7 by fastening the fastening bolt 10 or the like. Therefore, the rack gear 7 can be accurately assembled to the rack gear mounting surface 8 in a state where the deformation is corrected, and a state in which the rack gear 7 is accurately meshed with the pinion gear 6 can be formed.

なお、本例では、ラックギヤ７に一定幅で一定深さの細長い長方形断面の溝１３を形成してある。溝１３は長方形以外の断面形状の溝であってもよい。また、溝底面部分は湾曲弧面でなくても良い。例えば、溝開口部から溝底面に向かって先細りの三角形断面の溝でもよい。また、溝１３の間隔は等間隔でなくてもよい。例えば、ラックギヤ７の長さ方向１１ａにおいて、取付け穴１４の近傍では溝の間隔を広くし、取付け穴１４から遠い部分では溝の間隔を狭くする。これにより、締結ボルトによる締結力が確保され、ラックギヤ７の変形も確実に矯正される。 In this example, the rack gear 7 is formed with a groove 13 having an elongated rectangular cross section having a constant width and a constant depth. The groove 13 may be a groove having a cross-sectional shape other than a rectangle. Further, the bottom surface portion of the groove does not have to be a curved arc surface. For example, a groove having a triangular cross section that tapers from the groove opening toward the bottom surface of the groove may be used. Further, the intervals of the grooves 13 do not have to be equal. For example, in the length direction 11a of the rack gear 7, the groove spacing is widened in the vicinity of the mounting hole 14, and the groove spacing is narrowed in the portion far from the mounting hole 14. As a result, the fastening force by the fastening bolt is secured, and the deformation of the rack gear 7 is surely corrected.

以上説明したように、ラックギヤ７をラックギヤ取付け面８に取り付けるラックギヤ取付け構造において、ラックギヤ７のラック本体部材１１には、複数条の溝１３が形成されている。溝１３は、ラック本体部材１１において、ラック歯列１２が形成されている部位とは異なる部位を、その長さ方向１１ａに沿って、所定の間隔で分断している。ラックギヤ７をラックギヤ取付け面８に締結固定すると、ラックギヤ７に加わる締結力によってラックギヤ７の変形が確実に矯正され、この状態で、ラックギヤ取付け面８に取り付けられる。ラックギヤ７に大きな外力を加えて塑性変形させて、ラックギヤの変形を除去する工程等を必要とせずに、ラックギヤ７を精度良く加工でき、また、実機に精度良く組み付けることができる。
As described above, in the rack gear mounting structure in which the rack gear 7 is mounted on the rack gear mounting surface 8, a plurality of grooves 13 are formed in the rack body member 11 of the rack gear 7. The groove 13 divides a portion of the rack body member 11 different from the portion where the rack dentition 12 is formed along the length direction 11a at predetermined intervals. When the rack gear 7 is fastened and fixed to the rack gear mounting surface 8, the deformation of the rack gear 7 is surely corrected by the fastening force applied to the rack gear 7, and the rack gear 7 is mounted on the rack gear mounting surface 8 in this state. The rack gear 7 can be machined with high accuracy and can be assembled to the actual machine with high accuracy without the need for a step of plastically deforming the rack gear 7 by applying a large external force to remove the deformation of the rack gear.

Claims (6)

外力を加えて変形が矯正された状態で、ラックギヤが所定のラックギヤ取付け面に取り付けられているラックギヤ取付け構造であって、
前記ラックギヤは、
直線状に延びるラック本体部材と、
前記ラック本体部材の外周側面に、その長さ方向に形成したラック歯列と、
前記ラック本体部材における前記ラック歯列が形成されている部位とは異なる部位を、前記長さ方向に沿って、所定の間隔で分断している複数条の溝と、
を有していることを特徴とするラックギヤ取付け構造。It is a rack gear mounting structure in which the rack gear is mounted on a predetermined rack gear mounting surface in a state where the deformation is corrected by applying an external force.
The rack gear
The rack body member that extends in a straight line and
A rack dentition formed on the outer peripheral side surface of the rack body member in the length direction thereof,
A plurality of grooves in the rack body member, which are different from the portion where the rack dentition is formed, are divided at predetermined intervals along the length direction.
A rack gear mounting structure characterized by having. 請求項１において、
前記溝は、前記ラック本体部材において、前記長さ方向に沿って等間隔に形成され、前記長さ方向に直交する方向に延びているラックギヤ取付け構造。In claim 1,
A rack gear mounting structure in which the grooves are formed in the rack body member at equal intervals along the length direction and extend in a direction orthogonal to the length direction. 請求項２において、
前記ラック本体部材は矩形断面の部材であり、
前記ラック本体部材の４つの外周側面を第１〜第４側面とすると、前記ラック歯列は前記第１側面に形成されており、
前記溝は、前記第３側面に開口し、前記第３側面における前記長さ方向に直交する幅方向の全幅に亘って形成されており、
前記溝の前記幅方向の両側の溝端は、前記第２側面および前記第４側面に開口しているラックギヤ取付け構造。In claim 2,
The rack body member has a rectangular cross section and has a rectangular cross section.
Assuming that the four outer peripheral side surfaces of the rack body member are the first to fourth side surfaces, the rack dentition is formed on the first side surface.
The groove opens on the third side surface and is formed over the entire width in the width direction orthogonal to the length direction on the third side surface.
A rack gear mounting structure in which the groove ends on both sides of the groove in the width direction are open to the second side surface and the fourth side surface. 請求項３において、
前記溝は、溝幅よりも溝深さが大きい長方形断面の溝であり、前記第１側面に向かって前記第３側面から垂直に延びているラックギヤ取付け構造。In claim 3,
The groove is a groove having a rectangular cross section having a groove depth larger than the groove width, and has a rack gear mounting structure that extends vertically from the third side surface toward the first side surface. 請求項１に記載のラックギヤ取付け構造に用いるラックギヤであって、
前記ラックギヤは、
直線状に延びるラック本体部材と、
前記ラック本体部材の外周側面に、その長さ方向に形成したラック歯列と、
前記ラック本体部材における前記ラック歯列が形成されている部位とは異なる部位を、前記長さ方向に沿って、所定の間隔で分断している複数条の溝と、
を有しており、
前記溝は、前記ラック本体部材において、前記長さ方向に沿って等間隔に形成されており、
前記ラック本体部材は矩形断面の部材であり、
前記ラック本体部材の４つの外周側面を第１〜第４側面とすると、前記ラック歯列は前記第１側面に形成されており、
前記溝は、前記第３側面に開口し、前記第３側面における前記長さ方向に直交する幅方向の全幅に亘って形成されており、
前記溝の前記幅方向の両側の溝端は、前記第２側面および前記第４側面に開口しているラックギヤ。A rack gear used in the rack gear mounting structure according to claim 1.
The rack gear
The rack body member that extends in a straight line and
A rack dentition formed on the outer peripheral side surface of the rack body member in the length direction thereof,
A plurality of grooves in the rack body member, which are different from the portion where the rack dentition is formed, are divided at predetermined intervals along the length direction.
Have and
The grooves are formed in the rack body member at equal intervals along the length direction.
The rack body member has a rectangular cross section and has a rectangular cross section.
Assuming that the four outer peripheral side surfaces of the rack body member are the first to fourth side surfaces, the rack dentition is formed on the first side surface.
The groove opens on the third side surface and is formed over the entire width in the width direction orthogonal to the length direction on the third side surface.
The groove ends on both sides of the groove in the width direction are rack gears that are open to the second side surface and the fourth side surface. 請求項５において、
前記溝は、溝幅よりも溝深さが大きい長方形断面の溝であり、前記第１側面に向かって前記第３側面から垂直に延びているラックギヤ。
In claim 5,
The groove is a groove having a rectangular cross section having a groove depth larger than the groove width, and is a rack gear that extends vertically from the third side surface toward the first side surface.
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