JP2020125777A - Rack bar - Google Patents

Rack bar Download PDF

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Publication number
JP2020125777A
JP2020125777A JP2019017145A JP2019017145A JP2020125777A JP 2020125777 A JP2020125777 A JP 2020125777A JP 2019017145 A JP2019017145 A JP 2019017145A JP 2019017145 A JP2019017145 A JP 2019017145A JP 2020125777 A JP2020125777 A JP 2020125777A
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Japan
Prior art keywords
shaft member
rack
screw
rack bar
shaft
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JP2019017145A
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Japanese (ja)
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青木　健一
Kenichi Aoki
健一 青木
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Neturen Co Ltd
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Neturen Co Ltd
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Priority to JP2019017145A priority Critical patent/JP2020125777A/en
Priority to PCT/JP2020/002578 priority patent/WO2020158616A1/en
Publication of JP2020125777A publication Critical patent/JP2020125777A/en
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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
    • B62D7/00—Steering linkage; Stub axles or their mountings
    • B62D7/16—Arrangement of linkage connections
    • B62D7/163—Arrangement of linkage connections substantially in axial direction, e.g. between rack bar and tie-rod
    • 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)
  • Transmission Devices (AREA)

Abstract

To provide a rack bar excellent in versatility.SOLUTION: A rack bar 10 includes: a hollow shaft material 12 on which a rack 11 engaged with a pinion is formed; and a pair of screw members 13 joined with ends 12a, 12b on both sides in an axial direction of the shaft material 12, having an extention portion 14 adjacently provided in the axial direction with respect to the ends 12a, 12b of the shaft material 12 respectively, and having a female screw 15 formed on the extension portion 14.SELECTED DRAWING: Figure 2

Description

本発明は、ラックバーに関する。 The present invention relates to a rack bar.

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として、例えば中実の軸材にラックが形成された、いわゆる中実ラックバーが知られている。また、中空の軸材にラックが形成され、軽量化が図られた、いわゆる中空ラックバーも知られている。 As a rack bar used in a rack and pinion type steering device or the like, for example, a so-called solid rack bar in which a rack is formed on a solid shaft material is known. There is also known a so-called hollow rack bar in which a rack is formed on a hollow shaft member to reduce the weight.

ステアリング装置において、これらのラックバーの軸方向両側の端部は、車輪を支持するナックルにタイロッドを介してそれぞれ連結される。そして、ラックバーの端部とタイロッドとはボールジョイントを介して接続される。ボールジョイントは、ボールを有するボールスタッドと、ボールが嵌合する球面座を有するソケットとで構成されており、ソケットがラックバーの端部に固定される。ソケットは、典型的にはネジ締結によってラックバーの端部に固定され、ラックバーの端部には雌ネジが形成される（例えば、特許文献１参照）。 In the steering device, the ends of the rack bars on both sides in the axial direction are respectively connected to knuckles for supporting wheels via tie rods. The end of the rack bar and the tie rod are connected via a ball joint. The ball joint includes a ball stud having a ball and a socket having a spherical seat to which the ball fits, and the socket is fixed to an end of the rack bar. The socket is typically fixed to the end portion of the rack bar by screw fastening, and a female screw is formed at the end portion of the rack bar (for example, see Patent Document 1).

特開２００６−１６０１１３号公報JP, 2006-160113, A

ラックバーの端部に固定されるボールジョイントは、比較的標準化されている。一方、中空ラックバーに用いられる軸材は、例えばステアリング装置の仕様等に応じて、内径及び外径が種々に異なる。ここで、ラックバーの端部に形成される雌ネジのネジ径は、軸材の内径によって制限される。このため、標準的に用いられるボールジョイントを取り付けることができないといった不都合が生じ得る。 The ball joint fixed to the end of the rack bar is relatively standardized. On the other hand, the shaft material used for the hollow rack bar has various inner diameters and outer diameters depending on, for example, the specifications of the steering device. Here, the screw diameter of the female screw formed at the end portion of the rack bar is limited by the inner diameter of the shaft member. For this reason, there is a possibility that a standard ball joint cannot be attached.

特許文献１に記載されたラックバーでは、筒状の中子部材が中空のラックシャフトの端部に圧入されており、中子部材の内周に雌ネジが形成されている。この場合、雌ネジを形成するに足る中子部材の肉厚を確保できる程に、標準的に用いられるボールジョイントの雄ネジのネジ径がラックシャフトの内径よりも小さい場合には、ボールジョイントの取り付けが可能である。しかし、例えば標準的に用いられるボールジョイントの雄ネジのネジ径がラックシャフトの内径よりも僅かに小さいだけであり、雌ネジを形成するには中子部材の肉厚が不足する場合や、標準的なボールジョイントの雄ネジのネジ径がラックシャフトの外径よりも大きい場合には、ボールジョイントを取り付けることができない。 In the rack bar described in Patent Document 1, a tubular core member is press-fitted into the end of a hollow rack shaft, and a female screw is formed on the inner circumference of the core member. In this case, if the thread diameter of the standard male thread of the ball joint is smaller than the inner diameter of the rack shaft so that the thickness of the core member sufficient to form the female thread can be secured, Can be installed. However, for example, when the diameter of the male screw of the ball joint that is normally used is only slightly smaller than the inner diameter of the rack shaft, and the thickness of the core member is insufficient to form the female screw, If the male screw diameter of the conventional ball joint is larger than the outer diameter of the rack shaft, the ball joint cannot be attached.

本発明は、上述した事情に鑑みなされたものであり、汎用性に優れるラックバーを提供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 thereof is to provide a rack bar having excellent versatility.

本発明の一態様のラックバーは、ピニオンと噛み合うラックが形成されている中空の軸材と、前記軸材の軸方向両側の端部に接合されており、前記軸材の前記端部に対して軸方向に隣設される延長部をそれぞれ有し、前記延長部に雌ネジが形成されている一対のネジ部材と、を備える。 A rack bar according to one aspect of the present invention is joined to a hollow shaft member in which a rack that meshes with a pinion is formed, and to both ends of the shaft member on both sides in the axial direction, with respect to the end part of the shaft member. And a pair of screw members each having an extension portion adjacent to each other in the axial direction, and each of the extension portions is formed with a female screw.

また、本発明の一態様のラックバーは、ピニオンと噛み合う第１ラックが形成されている中空の第１軸材と、前記第１軸材の軸方向一方側の第１端部に接合されており、ピニオンと噛み合う第２ラックが形成されている第２軸材と、前記第１軸材の軸方向他方側の第２端部に接合されており、前記第１軸材の前記第２端部に対して軸方向に隣設される延長部を有し、前記延長部に雌ネジが形成されているネジ部材と、を備える。 A rack bar according to an aspect of the present invention is formed by joining a hollow first shaft member on which a first rack that meshes with a pinion is formed and a first end on one axial side of the first shaft member. A second shaft member formed with a second rack that meshes with the pinion, and a second end of the first shaft member on the other axial side, and the second end of the first shaft member. A threaded member having an extension adjacent to the section in the axial direction, and a female screw formed on the extension.

本発明によれば、汎用性に優れるラックバーを提供することができる。 According to the present invention, it is possible to provide a rack bar having excellent versatility.

本発明の実施形態を説明するための、ステアリング装置の一例の断面図である。It is a sectional view of an example of a steering device for explaining the embodiment of the present invention. 図１のステアリング装置のラックバーの断面図である。It is sectional drawing of the rack bar of the steering apparatus of FIG. 図２のラックバーの変形例の断面図である。It is sectional drawing of the modification of the rack bar of FIG. 図２のラックバーの他の変形例の断面図である。It is sectional drawing of the other modification of the rack bar of FIG. 図２のラックバーの他の変形例の断面図である。It is sectional drawing of the other modification of the rack bar of FIG. 図２のラックバーの製造方法を示す模式図である。It is a schematic diagram which shows the manufacturing method of the rack bar of FIG. 図２のラックバーの製造方法を示す模式図である。It is a schematic diagram which shows the manufacturing method of the rack bar of FIG. 図２のラックバーの製造方法を示す模式図である。It is a schematic diagram which shows the manufacturing method of the rack bar of FIG. 図２のラックバーの製造方法を示す模式図である。It is a schematic diagram which shows the manufacturing method of the rack bar of 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断面図である。It is sectional drawing of the other example of the rack bar for describing embodiment of this invention. 図１０のラックバーの変形例の断面図である。It is sectional drawing of the modification of the rack bar of FIG.

図１は、本発明の実施形態を説明するための、ステアリング装置の一例を示す。 FIG. 1 shows an example of a steering device for explaining an embodiment of the present invention.

図１に示す車両のステアリング装置は、車両の操舵軸に連結されたピニオン１と、ピニオン１と噛み合うラック１１が設けられたラックバー１０とを備える。 The vehicle steering system shown in FIG. 1 includes a pinion 1 connected to a steering shaft of the vehicle, and a rack bar 10 provided with a rack 11 that meshes with the pinion 1.

ラックバー１０の軸方向両側の端部は、ボールジョイント３を介してタイロッド４にそれぞれ連結されている。ボールジョイント３は、球形状のボール３ａと、ボール３ａを受けるソケット３ｂとによって構成されており、ソケット３ｂがラックバー１０の端部に固定されている。 The ends on both sides in the axial direction of the rack bar 10 are connected to the tie rods 4 via the ball joints 3, respectively. The ball joint 3 includes a spherical ball 3 a and a socket 3 b that receives the ball 3 a, and the socket 3 b is fixed to the end of the rack bar 10.

ピニオン１及びラックバー１０はケーシング５に収容され、ボールジョイント３を介して連結されているラックバー１０とタイロッド４との連結部は、ケーシング５とタイロッド４とに跨る蛇腹状のブーツ６によって覆われている。 The pinion 1 and the rack bar 10 are housed in the casing 5, and the connecting portion of the rack bar 10 and the tie rod 4 that are connected via the ball joint 3 is covered by a bellows-shaped boot 6 that straddles the casing 5 and the tie rod 4. It is being appreciated.

図２は、ラックバー１０を示す。 FIG. 2 shows the rack bar 10.

ラックバー１０は中空の軸材１２を備え、ラック１１は、軸材１２の周方向の一部の外周に形成されている。ラック１１は、歯のピッチが一定のＣＧＲ（Constant Gear Ratio）でもよいし、歯のピッチが変化するＶＧＲ（Variable Gear Ratio）でもよい。また、ラック１１の歯は、歯幅方向が軸材１２の軸方向と直交するものでもよいし、歯幅方向が軸材１２の軸方向と斜交するものでもよい。 The rack bar 10 includes a hollow shaft member 12, and the rack 11 is formed on the outer periphery of a part of the shaft member 12 in the circumferential direction. The rack 11 may be a CGR (Constant Gear Ratio) in which the tooth pitch is constant or a VGR (Variable Gear Ratio) in which the tooth pitch changes. Further, the teeth of the rack 11 may have a tooth width direction orthogonal to the axial direction of the shaft member 12, or may have a tooth width direction obliquely intersecting the axial direction of the shaft member 12.

また、ラックバー１０は、軸材１２の軸方向両側の端部１２ａ，１２ｂに接合されている一対のネジ部材１３をさらに備え、ネジ部材１３は、軸材１２の端部１２ａ，１２ｂに対して軸方向に隣設される延長部１４を有する。延長部１４は、ラックバー１０の端部を構成している。延長部１４には雌ネジ１５が形成されている。ボールジョイント３のソケット３ｂ（図１参照）には雄ネジが形成されており、ソケット３ｂの雄ネジと延長部１４の雌ネジ１５とがネジ締結されることにより、ソケット３ｂはラックバー１０の端部に固定される。 Further, the rack bar 10 further includes a pair of screw members 13 joined to the end portions 12a and 12b on both axial sides of the shaft member 12, and the screw member 13 is different from the end portions 12a and 12b of the shaft member 12. And an extension portion 14 that is adjacently provided in the axial direction. The extension portion 14 constitutes an end portion of the rack bar 10. A female screw 15 is formed on the extension portion 14. A male screw is formed on the socket 3b (see FIG. 1) of the ball joint 3, and the male screw of the socket 3b and the female screw 15 of the extension portion 14 are screw-fastened, so that the socket 3b is attached to the rack bar 10. It is fixed at the end.

図２に示す例では、ネジ部材１３は管材によって形成されており、ネジ部材１３の内径φ１は軸材１２の内径φ３より小さく、ネジ部材１３の外径φ２は軸材１２の内径φ３より大きく、ネジ部材１３及び軸材１２の端面に重なり代が設定されている。ネジ部材１３は、軸材１２と同軸に配置され、軸材１２の端部１２ａ，１２ｂの端面に接合されている。この場合、ネジ部材１３の全体が延長部１４であると言える。ネジ部材１３と軸材１２とは、例えば溶接、摩擦圧接等によって接合される。 In the example shown in FIG. 2, the screw member 13 is formed of a pipe material, the inner diameter φ1 of the screw member 13 is smaller than the inner diameter φ3 of the shaft member 12, and the outer diameter φ2 of the screw member 13 is larger than the inner diameter φ3 of the shaft member 12. The overlap margins are set on the end faces of the screw member 13 and the shaft member 12. The screw member 13 is arranged coaxially with the shaft member 12 and is joined to the end faces of the end portions 12 a and 12 b of the shaft member 12. In this case, it can be said that the entire screw member 13 is the extension portion 14. The screw member 13 and the shaft member 12 are joined, for example, by welding, friction welding, or the like.

ネジ部材１３の内周には雌ネジ１５が形成されており、雌ネジ１５のネジ径は軸材１２の内径φ３よりも小さい。標準的なボールジョイント３のソケット３ｂに形成されている雄ネジのネジ径に対して軸材１２の内径φ３が大きい場合にも、ソケット３ｂの雄ネジに適合する雌ネジ１５をネジ部材１３の内周に形成できる。ネジ部材１３の内径φ１は、ネジ部材１３の内周に形成する雌ネジ１５のネジ径に応じて適宜設定される。また、ネジ部材１３の外径φ２は、ネジ部材１３と軸材１２との接合強度を確保するうえで必要な端面の重なり代を考慮して適宜設定される。 A female screw 15 is formed on the inner periphery of the screw member 13, and the screw diameter of the female screw 15 is smaller than the inner diameter φ3 of the shaft member 12. Even when the inner diameter φ3 of the shaft member 12 is larger than the screw diameter of the male screw formed in the socket 3b of the standard ball joint 3, the female screw 15 that matches the male screw of the socket 3b is attached to the screw member 13. It can be formed on the inner circumference. The inner diameter φ1 of the screw member 13 is appropriately set according to the screw diameter of the female screw 15 formed on the inner circumference of the screw member 13. Further, the outer diameter φ2 of the screw member 13 is appropriately set in consideration of the overlapping margin of the end faces necessary to secure the joint strength between the screw member 13 and the shaft member 12.

図３はネジ部材１３の変形例を示し、図３に示す例では、管材からなるネジ部材１３の内径φ１は軸材１２の内径φ３より大きく且つ軸材１２の外径φ４より小さく、ネジ部材１３及び軸材１２の端面に重なり代が設定されている。ネジ部材１３は、軸材１２と同軸に配置され、軸材１２の端部１２ａ，１２ｂの端面に接合されている。ネジ部材１３の内周には雌ネジ１５が形成されており、雌ネジ１５のネジ径は、軸材１２の内径φ３よりも大きい。標準的なボールジョイント３のソケット３ｂに形成されている雄ネジのネジ径に対して軸材１２の外径φ４は大きいが、その差が僅かである（軸材１２の内周に雌ネジを形成するには軸材１２の肉厚が不足する）場合や、ソケット３ｂに形成されている雄ネジのネジ径に対して軸材１２の外径φ４が小さい場合にも、ソケット３ｂの雄ネジに適合する雌ネジ１５をネジ部材１３の内周に形成できる。 FIG. 3 shows a modified example of the screw member 13. In the example shown in FIG. 3, the inner diameter φ1 of the screw member 13 made of a pipe material is larger than the inner diameter φ3 of the shaft member 12 and smaller than the outer diameter φ4 of the shaft member 12, An overlap margin is set on the end faces of the shaft 13 and the shaft member 12. The screw member 13 is arranged coaxially with the shaft member 12 and is joined to the end faces of the end portions 12 a and 12 b of the shaft member 12. A female screw 15 is formed on the inner periphery of the screw member 13, and the screw diameter of the female screw 15 is larger than the inner diameter φ3 of the shaft member 12. The outer diameter φ4 of the shaft member 12 is larger than the screw diameter of the male screw formed on the socket 3b of the standard ball joint 3, but the difference is slight (a female screw is provided on the inner circumference of the shaft member 12). When the shaft material 12 is insufficient in thickness to be formed) or when the outer diameter φ4 of the shaft material 12 is smaller than the thread diameter of the male screw formed on the socket 3b, the male screw of the socket 3b is also formed. The female screw 15 conforming to the above can be formed on the inner circumference of the screw member 13.

このように、中空の軸材１２の端部１２ａ，１２ｂにネジ部材１３を接合し、端部１２ａ，１２ｂに対して軸方向に延長部１４を隣設して、延長部１４に雌ネジ１５を形成することにより、雌ネジ１５のネジ径を自由に設定することができる。これにより、ラックバー１０の汎用性を高めることができる。 Thus, the screw member 13 is joined to the end portions 12a and 12b of the hollow shaft member 12, the extension portion 14 is provided adjacent to the end portions 12a and 12b in the axial direction, and the female screw 15 is attached to the extension portion 14. By forming the, the screw diameter of the female screw 15 can be freely set. Thereby, the versatility of the rack bar 10 can be improved.

なお、図２及び図３に示す例では、ネジ部材１３は管材によって形成されているが、図４に示すように、ネジ部材１３は棒材によって形成されてもよい。ネジ部材１３を形成する棒材の断面形状は特に限定されないが、例えば円形状である。そして、ネジ部材１３が棒材からなる場合に、図４に示すように、ネジ部材１３は、軸材１２の端部１２ａ，１２ｂの内側に嵌合する嵌合部１７を有してもよく、又は、図５に示すように、軸材１２の端部１２ａ，１２ｂの外側に嵌合する嵌合部１８を有してもよい。嵌合部１７又は嵌合部１８を有することにより、ネジ部材１３と軸材１２との接合強度が高まる。 In the example shown in FIGS. 2 and 3, the screw member 13 is formed of a pipe material, but as shown in FIG. 4, the screw member 13 may be formed of a rod material. The sectional shape of the rod material forming the screw member 13 is not particularly limited, but is, for example, a circular shape. When the screw member 13 is made of a rod material, the screw member 13 may have a fitting portion 17 that fits inside the end portions 12 a and 12 b of the shaft member 12, as shown in FIG. 4. Alternatively, as shown in FIG. 5, a fitting portion 18 that fits outside the end portions 12a and 12b of the shaft member 12 may be provided. By having the fitting portion 17 or the fitting portion 18, the joint strength between the screw member 13 and the shaft member 12 is increased.

ラックバー１０は、例えば次のようにして製造される。まず、軸材１２にラック１１が形成され、ラック１１が形成された軸材１２の軸方向両側の端部にネジ部材１３が接合される。そして、軸材１２に接合されたネジ部材１３の延長部１４に雌ネジ１５が形成される。以下、順に説明する。 The rack bar 10 is manufactured as follows, for example. First, the rack 11 is formed on the shaft member 12, and the screw members 13 are joined to the axially opposite ends of the shaft member 12 on which the rack 11 is formed. Then, the female screw 15 is formed on the extension portion 14 of the screw member 13 joined to the shaft member 12. Hereinafter, they will be described in order.

軸材１２は、例えばＪＩＳ−Ｓ４５Ｃ等の鋼からなる中空の軸材である。図６に示すように、軸材１２の周方向の一部の外周がプレス加工で平坦状に押し潰され、軸材１２の軸方向に延びる平潰し部１６が形成される。この後、必要に応じて、平潰し部１６を含む軸材１２の外周面にリン酸塩皮膜を形成する化成処理が施される。 The shaft member 12 is a hollow shaft member made of steel such as JIS-S45C. As shown in FIG. 6, the outer periphery of a part of the shaft member 12 in the circumferential direction is crushed into a flat shape by press working to form a flattened portion 16 extending in the axial direction of the shaft member 12. Thereafter, if necessary, a chemical conversion treatment is performed to form a phosphate film on the outer peripheral surface of the shaft member 12 including the flattened portion 16.

次に、図７に示すように、平潰し部１６を含む軸材１２の一部が金型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１２を上下方向に挟み、軸材１２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１６の略平坦な外面に当接した状態で固定される。平潰し部１６の外面に接するラック歯型２３の成形面２４には、ラック１１を成形する複数の歯溝が設けられている。 Next, as shown in FIG. 7, a part of the shaft member 12 including the flattened portion 16 is held by the mold 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) to sandwich the shaft member 12 in the vertical direction and hold the outer periphery of the shaft member 12. A rack tooth mold 23 is detachably attached to the upper mold 21, and the rack tooth mold 23 is fixed in a state of abutting on the substantially flat outer surface of the flattened portion 16. A plurality of tooth grooves for molding the rack 11 are provided on the molding surface 24 of the rack tooth mold 23 that is in contact with the outer surface of the flattened portion 16.

ラック歯型２３が平潰し部１６に当接した状態で、芯金３０が、軸材１２の一方の端部側の開口を通して軸材１２に挿入され、押棒３１によって平潰し部１６の内部に圧入される。そして、圧入された芯金３０は、軸材１２の他方の端部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１２から排出される。芯金３０が平潰し部１６の全長に亘って往復移動される過程で、平潰し部１６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。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１６の材料がラック歯型２３の成形面２４の歯溝に次第に食い込み、成形面２４の形状が平潰し部１６に転写され、平潰し部１６にラック１１が形成される。 With the rack tooth mold 23 in contact with the flattened portion 16, the core metal 30 is inserted into the shaft 12 through the opening on one end side of the shaft 12 and is pushed into the flattened portion 16 by the push rod 31. It is pressed in. The press-fitted core metal 30 is pushed back by the push rod 32 inserted from the opening on the other end side of the shaft member 12 and discharged from the shaft member 12. In the process in which the cored bar 30 is reciprocally moved over the entire length of the flattened portion 16, the material of the flattened portion 16 is squeezed by the cored bar 30 and plastically flows toward the rack tooth mold 23. The cored bar 30 is gradually replaced with a larger one, and the press-fitting of the cored bar 30 is repeated, so that the material of the flattening portion 16 gradually bites into the tooth space of the molding surface 24 of the rack tooth mold 23, and the shape of the molding surface 24 is changed. The rack 11 is transferred to the flattened portion 16 and the rack 11 is formed on the flattened portion 16.

ラック１１が形成された軸材１２は、必要に応じて、歯の成形に伴う曲りの矯正、外周面の研削、ラック１１の硬度を高めるための焼入れ等の処理が施される。軸材１２の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。 If necessary, the shaft material 12 on which the rack 11 is formed is subjected to treatments such as bending correction associated with tooth formation, grinding of the outer peripheral surface, and quenching for increasing the hardness of the rack 11. Heating at the time of quenching the shaft material 12 can be performed by, for example, high frequency induction heating, but is not limited to high frequency induction heating.

そして、図８に示すように、軸材１２の軸方向両側の端部１２ａ，１２ｂにネジ部材１３が接合され、図９に示すように、ネジ部材１３の延長部１４に雌ネジ１５が形成される。軸材１２とネジ部材１３とは、上記のとおり、溶接、摩擦圧接等によって接合される。ネジ部材１３の材料は、軸材１２の材料と同じでもよいし、異なってもよい。軸材１２の硬度は焼入れによって高められることを考慮し、ネジ部材１３の材料は、軸材１２の材料よりも高い硬度を有してもよい。 Then, as shown in FIG. 8, the screw members 13 are joined to the ends 12a and 12b of the shaft member 12 on both sides in the axial direction, and the female screw 15 is formed on the extension portion 14 of the screw member 13 as shown in FIG. To be done. The shaft member 12 and the screw member 13 are joined by welding, friction welding or the like as described above. The material of the screw member 13 may be the same as or different from the material of the shaft member 12. Considering that the hardness of the shaft member 12 is increased by quenching, the material of the screw member 13 may have a higher hardness than the material of the shaft member 12.

図１０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す。 FIG. 10 shows another example of the rack bar for explaining the embodiment of the present invention.

図１０に示すラックバー１１０は、アシスト機構を備えるステアリング装置に使用されるものであり、操舵軸に連結された操舵ピニオンと噛み合う第１ラック１１１と、アシスト機構の補助ピニオンと噛み合う第２ラック１１２とが設けられている。 The rack bar 110 shown in FIG. 10 is used for a steering device including an assist mechanism, and includes a first rack 111 that meshes with a steering pinion connected to a steering shaft and a second rack 112 that meshes with an auxiliary pinion of the assist mechanism. And are provided.

ステアリングホイールの回動操作によって操舵ピニオンが回動され、第１ラック１１１にて操舵ピニオンと噛み合うラックバー１１０が軸方向に移動される。そして、ステアリングホイールの操舵力などに応じて制御されるアシスト機構のモータの駆動力が、第２ラック１１２に噛み合う補助ピニオンを介してラックバー１１０に伝達され、ステアリングホイールの回動操作によるラックバー１１０の移動が補助される。 The steering pinion is rotated by the rotation operation of the steering wheel, and the rack bar 110 that meshes with the steering pinion in the first rack 111 is moved in the axial direction. The driving force of the motor of the assist mechanism that is controlled according to the steering force of the steering wheel is transmitted to the rack bar 110 through the auxiliary pinion that meshes with the second rack 112, and the rack bar is rotated by the steering wheel. The movement of 110 is assisted.

ラックバー１１０は、中空の第１軸材１１３と、中実の第２軸材１１４とを備え、第１軸材１１３の軸方向一方側の第１端部１１３ａと、第２軸材１１４の軸方向一方側の第１端部１１４ａとは、例えば溶接、摩擦圧接等により接合されている。第１ラック１１１は、第１軸材１１３の周方向の一部の外周に形成されており、第２ラック１１２は、第２軸材１１４の周方向の一部の外周に形成されている。操舵軸とアシスト機構との位置関係に応じて、第１ラック１１１と第２ラック１１２との間には、ラックバー１１０の中心軸まわりの回転角度差が適宜設定される。 The rack bar 110 includes a hollow first shaft member 113 and a solid second shaft member 114. The first end member 113 a on one axial side of the first shaft member 113 and the second shaft member 114 are provided. The first end 114a on the one axial side is joined, for example, by welding, friction welding or the like. The first rack 111 is formed on a part of the outer circumference of the first shaft member 113 in the circumferential direction, and the second rack 112 is formed on a part of the outer circumference of the second shaft member 114 in the circumferential direction. A rotation angle difference around the central axis of the rack bar 110 is appropriately set between the first rack 111 and the second rack 112 according to the positional relationship between the steering shaft and the assist mechanism.

第１ラック１１１は、上述したラックバー１０の中空の軸材１２に形成されるラック１１と同様にして、中空の第１軸材１１３に形成される。第２ラック１１２は、例えば切削加工によって中実の第２軸材１１４に形成される。第１ラック１１１は、第１軸材１１３と第２軸材１１４とが接合される以前に、第１軸材１１３に予め形成される。一方、第２ラック１１２は、第１軸材１１３と第２軸材１１４とが接合される以前に、第２軸材１１４に予め形成されてもよいし、第１軸材１１３と第２軸材１１４とが接合された後に、第２軸材１１４に形成されてもよい。 The first rack 111 is formed on the hollow first shaft member 113 in the same manner as the rack 11 formed on the hollow shaft member 12 of the rack bar 10 described above. The second rack 112 is formed on the solid second shaft member 114 by cutting, for example. The first rack 111 is preformed on the first shaft 113 before the first shaft 113 and the second shaft 114 are joined. On the other hand, the second rack 112 may be preformed on the second shaft member 114 before the first shaft member 113 and the second shaft member 114 are joined together, or the first shaft member 113 and the second shaft member 113 may be formed. The second shaft material 114 may be formed after the material 114 is joined.

ラックバー１１０は、第１軸材１１３の第２端部１１３ｂに接合されているネジ部材１１５をさらに備え、ネジ部材１１５は、第１軸材１１３の第２端部１１３ｂに対して軸方向に隣設される延長部１１６を有する。延長部１１６は、ラックバー１１０の軸方向一方側の端部を構成しており、延長部１１６には雌ネジ１１７が形成されている。雌ネジ１１７は、ボールジョイント３のソケット３ｂ（図１参照）の雄ネジとネジ締結され、これにより、ソケット３ｂはラックバー１１０の第１軸材１１３側の端部に固定される。 The rack bar 110 further includes a screw member 115 joined to the second end 113b of the first shaft member 113, and the screw member 115 is axially arranged with respect to the second end 113b of the first shaft member 113. It has the extension part 116 provided adjacently. The extension portion 116 constitutes an end portion on one axial side of the rack bar 110, and a female screw 117 is formed on the extension portion 116. The female screw 117 is screw-fastened to the male screw of the socket 3b (see FIG. 1) of the ball joint 3, whereby the socket 3b is fixed to the end of the rack bar 110 on the side of the first shaft 113.

ネジ部材１１５は、上述したラックバー１０のネジ部材１３と同様に構成でき、図１０に示すように管材によって形成されてもよいし、棒材によって形成されてもよい。中空の第１軸材１１３の第２端部１１３ｂにネジ部材１１５を接合し、第２端部１１３ｂに対して軸方向に延長部１１６を隣設して、延長部１１６に雌ネジ１１７を形成することにより、雌ネジ１１７のネジ径を自由に設定することができる。これにより、ラックバー１１０の汎用性を高めることができる。 The screw member 115 can be configured similarly to the screw member 13 of the rack bar 10 described above, and may be formed of a pipe material as shown in FIG. 10 or may be formed of a rod material. A screw member 115 is joined to the second end 113b of the hollow first shaft member 113, an extension 116 is provided adjacent to the second end 113b in the axial direction, and a female screw 117 is formed on the extension 116. By doing so, the screw diameter of the female screw 117 can be freely set. Thereby, the versatility of the rack bar 110 can be improved.

一方、ラックバー１１０の第２軸材１１４側の端部は、中実の第２軸材１１４の第２端部１１４ｂによって構成されており、第２軸材１１４の第２端部１１４ｂには雌ネジ１１８が形成されている。雌ネジ１１８もまた、ボールジョイント３のソケット３ｂ（図１参照）の雄ネジとネジ締結され、これにより、ソケット３ｂがラックバー１１０の第２軸材１１４側の端部に固定される。標準的なボールジョイント３のソケット３ｂに形成されている雄ネジのネジ径に対して第２軸材１１４の外径が小さい場合には、例えば据え込鍛造等によって第２軸材１１４の第２端部１１４ｂの外径を拡大させればよい。 On the other hand, the end portion of the rack bar 110 on the second shaft member 114 side is configured by the second end portion 114b of the solid second shaft member 114, and the second end member 114b of the second shaft member 114 has a second end portion 114b. A female screw 118 is formed. The female screw 118 is also screw-fastened to the male screw of the socket 3b (see FIG. 1) of the ball joint 3, whereby the socket 3b is fixed to the end of the rack bar 110 on the second shaft 114 side. When the outer diameter of the second shaft member 114 is smaller than the screw diameter of the male screw formed in the socket 3b of the standard ball joint 3, for example, the second shaft member 2 The outer diameter of the end 114b may be increased.

図１１に示すラックバー２１０は、操舵軸に連結された操舵ピニオンと噛み合う第１ラック２１１が形成されている第１軸材２１３と、アシスト機構の補助ピニオンと噛み合う第２ラック２１２が形成されている第２軸材２１４とを備える。第１軸材２１３及び第２軸材２１４は、いずれも中空の軸材である。第１軸材２１３の軸方向一方側の第１端部２１３ａと第２軸材２１４の軸方向一方側の第１端部２１４ａとは、例えば溶接、摩擦圧接等により接合されている。 The rack bar 210 shown in FIG. 11 includes a first shaft member 213 formed with a first rack 211 that meshes with a steering pinion connected to a steering shaft, and a second rack 212 that meshes with an auxiliary pinion of an assist mechanism. The second shaft member 214 is provided. Both the first shaft member 213 and the second shaft member 214 are hollow shaft members. The first end portion 213a on one axial side of the first shaft member 213 and the first end portion 214a on one axial side of the second shaft member 214 are joined by, for example, welding or friction welding.

第１ラック２１１は、上述したラックバー１０の中空の軸材１２に形成されるラック１１と同様にして、中空の第１軸材２１３に形成され、第２ラック２１２もまた、上述したラックバー１０の中空の軸材１２に形成されるラック１１と同様にして、中空の第２軸材２１４に形成される。そして、第１ラック２１１及び第２ラック２１２は、第１軸材２１３と第２軸材２１４とが接合される以前に、第１軸材２１３及び第２軸材２１４に予め形成される。 The first rack 211 is formed on the hollow first shaft member 213 similarly to the rack 11 formed on the hollow shaft member 12 of the rack bar 10 described above, and the second rack 212 is also formed on the rack bar described above. The second hollow shaft member 214 is formed in the same manner as the rack 11 formed on the ten hollow shaft members 12. Then, the first rack 211 and the second rack 212 are preformed on the first shaft member 213 and the second shaft member 214 before the first shaft member 213 and the second shaft member 214 are joined.

ラックバー２１０は、第１軸材２１３の第２端部２１３ｂ及び第２軸材２１４の第２端部２１４ｂに接合されている一対のネジ部材２１５をさらに備え、ネジ部材２１５は、第１軸材２１３の第２端部２１３ｂ及び第２軸材２１４の第２端部２１４ｂに対して軸方向に隣設される延長部２１６を有する。延長部２１６は、ラックバー２１０の端部を構成しており、延長部２１６には雌ネジ２１７が形成されている。雌ネジ２１７は、ボールジョイント３のソケット３ｂ（図１参照）の雄ネジとネジ締結され、これにより、ソケット３ｂはラックバー２１０の端部に固定される。 The rack bar 210 further includes a pair of screw members 215 joined to the second end portion 213b of the first shaft member 213 and the second end portion 214b of the second shaft member 214, and the screw member 215 is the first shaft member. The second end 213b of the member 213 and the second end 214b of the second shaft member 214 have an extension 216 axially adjacent to the second end 213b. The extension portion 216 constitutes an end portion of the rack bar 210, and the extension portion 216 is formed with a female screw 217. The female screw 217 is screw-fastened to the male screw of the socket 3b (see FIG. 1) of the ball joint 3, whereby the socket 3b is fixed to the end of the rack bar 210.

ネジ部材２１５は、上述したラックバー１０のネジ部材１３と同様に構成でき、図１１に示すように管材によって形成されてもよいし、棒材によって形成されてもよい。中空の第１軸材２１３の第２端部２１３ｂ及び中空の第２軸材２１４の第２端部２１４ｂにネジ部材２１５を接合し、第２端部２１３ｂ，２１４ｂに対して軸方向に延長部２１６を隣設して、延長部２１６に雌ネジ２１７を形成することにより、雌ネジ２１７のネジ径を自由に設定することができる。これにより、ラックバー２１０の汎用性を高めることができる。 The screw member 215 can be configured similarly to the screw member 13 of the rack bar 10 described above, and may be formed of a pipe material as shown in FIG. 11 or may be formed of a rod material. A screw member 215 is joined to the second end portion 213b of the hollow first shaft member 213 and the second end portion 214b of the hollow second shaft member 214, and an axially extended portion with respect to the second end portions 213b and 214b. By arranging 216 adjacent to each other and forming the female screw 217 in the extension portion 216, the screw diameter of the female screw 217 can be freely set. Thereby, the versatility of the rack bar 210 can be improved.

以上、説明したとおり、本明細書に開示されたラックバーは、ピニオンと噛み合うラックが形成されている中空の軸材と、前記軸材の軸方向両側の端部に接合されており、前記軸材の前記端部に対して軸方向に隣設される延長部をそれぞれ有し、前記延長部に雌ネジが形成されている一対のネジ部材と、を備える。 As described above, as described above, the rack bar disclosed in the present specification is joined to the hollow shaft member in which the rack that meshes with the pinion is formed, and the end parts on both sides in the axial direction of the shaft member. A pair of screw members each having an extension portion axially adjacent to the end portion of the material, and a female screw being formed on the extension portion.

また、本明細書に開示されたラックバーは、前記ネジ部材が、前記軸材の軸方向両側の端面に接合されている。 Further, in the rack bar disclosed in the present specification, the screw member is joined to the end faces of the shaft member on both sides in the axial direction.

また、本明細書に開示されたラックバーは、前記ネジ部材が、棒材からなり、前記軸材の前記端部の内側又は外側に嵌合する嵌合部を有する。 Further, in the rack bar disclosed in the present specification, the screw member is made of a rod and has a fitting portion that fits inside or outside the end of the shaft.

また、本明細書に開示されたラックバーは、ピニオンと噛み合う第１ラックが形成されている中空の第１軸材と、前記第１軸材の軸方向一方側の第１端部に接合されており、ピニオンと噛み合う第２ラックが形成されている第２軸材と、前記第１軸材の軸方向他方側の第２端部に接合されており、前記第１軸材の前記第２端部に対して軸方向に隣設される延長部を有し、前記延長部に雌ネジが形成されているネジ部材と、を備える。 Further, the rack bar disclosed in the present specification is joined to a hollow first shaft member in which a first rack that meshes with a pinion is formed, and a first end portion on one axial side of the first shaft member. And a second shaft member on which a second rack that meshes with the pinion is formed, and a second end of the first shaft member on the other axial side of the first shaft member. A screw member having an extension portion adjacent to the end portion in the axial direction and having a female screw formed on the extension portion.

また、本明細書に開示されたラックバーは、前記第２軸材が中実の軸材であり、前記第２軸材の軸方向一方側の第１端部は、前記第１軸材に接合されており、前記第２軸材の軸方向他方側の第２端部に雌ネジが形成されている。 Further, in the rack bar disclosed in the present specification, the second shaft member is a solid shaft member, and the first end portion of the second shaft member on one axial side is formed on the first shaft member. They are joined to each other, and a female screw is formed on the second end portion on the other axial side of the second shaft member.

また、本明細書に開示されたラックバーは、前記第２軸材が中空の軸材であり、前記第２軸材の軸方向一方側の第１端部は、前記第１軸材に接合されており、前記第２軸材の軸方向他方側の第２端部に接合されており、前記第２軸材の前記第２端部に対して軸方向に隣設される延長部を有し、前記延長部に雌ネジが形成されているネジ部材をさらに備える。 Further, in the rack bar disclosed in the present specification, the second shaft member is a hollow shaft member, and the first end on one axial side of the second shaft member is joined to the first shaft member. And is joined to a second end portion of the second shaft member on the other side in the axial direction, and has an extension portion that is provided adjacent to the second end portion of the second shaft member in the axial direction. In addition, a screw member having a female screw formed on the extension is further provided.

１ ピニオン
３ ボールジョイント
３ａ ボール
３ｂ ソケット
４ タイロッド
５ ケーシング
６ ブーツ
１０ ラックバー
１１ ラック
１２ 軸材
１３ ネジ部材
１４ 延長部
１５ 雌ネジ
１６ 平潰し部
１７ 嵌合部
１８ 嵌合部
２０ 金型
２１ 上型
２２ 下型
２３ ラック歯型
２４ 成形面
２５ 歯溝
３０ 芯金
３１ 押棒
３２ 押棒
１１０ ラックバー
１１１ 第１ラック
１１２ 第２ラック
１１３ 第１軸材
１１４ 第２軸材
１１５ ネジ部材
１１６ 延長部
１１７ 雌ネジ
１１８ 雌ネジ
２１０ ラックバー
２１１ 第１ラック
２１２ 第２ラック
２１３ 第１軸材
２１４ 第２軸材
２１５ ネジ部材
２１６ 延長部
２１７ 雌ネジ 1 Pinion 3 Ball Joint 3a Ball 3b Socket 4 Tie Rod 5 Casing 6 Boot 10 Rack Bar 11 Rack 12 Shaft Member 13 Screw Member 14 Extension 15 Female Thread 16 Flattened Part 17 Fitting 18 Fitting 20 Mold 21 Upper Mold 22 Lower mold 23 Rack tooth mold 24 Forming surface 25 Tooth groove 30 Core bar 31 Push rod 32 Push rod 110 Rack bar 111 First rack 112 Second rack 113 First shaft member 114 Second shaft member 115 Screw member 116 Extension portion 117 Female screw 118 female screw 210 rack bar 211 first rack 212 second rack 213 first shaft member 214 second shaft member 215 screw member 216 extension 217 female screw

Claims (6)

ピニオンと噛み合うラックが形成されている中空の軸材と、
前記軸材の軸方向両側の端部に接合されており、前記軸材の前記端部に対して軸方向に隣設される延長部をそれぞれ有し、前記延長部に雌ネジが形成されている一対のネジ部材と、
を備えるラックバー。 A hollow shaft member formed with a rack that meshes with the pinion,
The shaft member is joined to both ends of the shaft member in the axial direction, and each of the shaft members has an extension part axially adjacent to the end part, and a female screw is formed on the extension part. A pair of screw members,
Rack bar with. 請求項１記載のラックバーであって、
前記ネジ部材は、前記軸材の軸方向両側の端面に接合されているラックバー。 The rack bar according to claim 1,
A rack bar in which the screw member is joined to end faces on both axial sides of the shaft member. 請求項１又は２記載のラックバーであって、
前記ネジ部材は、棒材からなり、前記軸材の前記端部の内側又は外側に嵌合する嵌合部を有するラックバー。 The rack bar according to claim 1 or 2, wherein
The said screw member is a rack bar which has a fitting part which fits inside or outside the said edge part of the said shaft material, consisting of a rod. ピニオンと噛み合う第１ラックが形成されている中空の第１軸材と、
前記第１軸材の軸方向一方側の第１端部に接合されており、ピニオンと噛み合う第２ラックが形成されている第２軸材と、
前記第１軸材の軸方向他方側の第２端部に接合されており、前記第１軸材の前記第２端部に対して軸方向に隣設される延長部を有し、前記延長部に雌ネジが形成されているネジ部材と、
を備えるラックバー。 A hollow first shaft member formed with a first rack that meshes with the pinion;
A second shaft member that is joined to a first end portion of the first shaft member on one axial side and has a second rack that meshes with the pinion;
The extension member is joined to a second end portion of the first shaft member on the other side in the axial direction and has an extension portion axially adjacent to the second end portion of the first shaft member. A screw member in which a female screw is formed,
Rack bar with. 請求項４記載のラックバーであって、
前記第２軸材は中実の軸材であり、
前記第２軸材の軸方向一方側の第１端部は、前記第１軸材に接合されており、
前記第２軸材の軸方向他方側の第２端部に雌ネジが形成されているラックバー。 The rack bar according to claim 4,
The second shaft member is a solid shaft member,
A first end portion on one axial side of the second shaft member is joined to the first shaft member,
A rack bar in which a female screw is formed on the second end of the second shaft member on the other axial side. 請求項４記載のラックバーであって、
前記第２軸材は中空の軸材であり、
前記第２軸材の軸方向一方側の第１端部は、前記第１軸材に接合されており、
前記第２軸材の軸方向他方側の第２端部に接合されており、前記第２軸材の前記第２端部に対して軸方向に隣設される延長部を有し、前記延長部に雌ネジが形成されているネジ部材をさらに備えるラックバー。 The rack bar according to claim 4,
The second shaft member is a hollow shaft member,
A first end portion on one axial side of the second shaft member is joined to the first shaft member,
The second shaft member has an extension part that is joined to the second end part on the other side in the axial direction and that is adjacent to the second end part of the second shaft member in the axial direction. The rack bar further including a screw member in which a female screw is formed.
JP2019017145A 2019-02-01 2019-02-01 Rack bar Pending JP2020125777A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2019017145A JP2020125777A (en) 2019-02-01 2019-02-01 Rack bar
PCT/JP2020/002578 WO2020158616A1 (en) 2019-02-01 2020-01-24 Rack bar

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2019017145A JP2020125777A (en) 2019-02-01 2019-02-01 Rack bar

Publications (1)

Publication Number Publication Date
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ID=69500804

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Link
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WO (1) WO2020158616A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5799968A (en) * 1995-02-24 1998-09-01 Loeffler; Fredrick L. Ball joint assembly
JP2013224106A (en) * 2012-04-23 2013-10-31 Jtekt Corp Steering device
JP2017082812A (en) * 2015-10-22 2017-05-18 高周波熱錬株式会社 Rack bar and steering device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006160113A (en) 2004-12-08 2006-06-22 Jtekt Corp Steering device
JP6792801B2 (en) 2017-07-04 2020-12-02 住友電装株式会社 Holding structure of slender member

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5799968A (en) * 1995-02-24 1998-09-01 Loeffler; Fredrick L. Ball joint assembly
JP2013224106A (en) * 2012-04-23 2013-10-31 Jtekt Corp Steering device
JP2017082812A (en) * 2015-10-22 2017-05-18 高周波熱錬株式会社 Rack bar and steering device

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