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JP7103859B2 - Exterior parts and manufacturing method of exterior parts - Google Patents
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JP7103859B2 - Exterior parts and manufacturing method of exterior parts - Google Patents

Exterior parts and manufacturing method of exterior parts Download PDF

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JP7103859B2
JP7103859B2 JP2018115752A JP2018115752A JP7103859B2 JP 7103859 B2 JP7103859 B2 JP 7103859B2 JP 2018115752 A JP2018115752 A JP 2018115752A JP 2018115752 A JP2018115752 A JP 2018115752A JP 7103859 B2 JP7103859 B2 JP 7103859B2
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fitted
resin
fitting
exterior
fitting portion
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JP2019217864A (en
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真人 池田
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Astemo Ltd
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Hitachi Astemo Ltd
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Description

本発明は、外装部品及び外装部品の製造方法に関する。 The present invention relates to an exterior part and a method for manufacturing the exterior part.

ステアリング装置は、左右方向に開口する筒状の外装部品を備え、この外装部品内に転舵軸を収容している。また、このような外装部品については、従来金属製のハウジング単体で構成されていたが、近年軽量化を図るため、樹脂部品(樹脂パイプ)と金属部品(金属製のハウジング)とを組み合わせて成る外装部品が開発されている(下記特許文献参照)。 The steering device includes a cylindrical exterior component that opens in the left-right direction, and the steering shaft is housed in the exterior component. In addition, such exterior parts have conventionally been composed of a single metal housing, but in recent years, in order to reduce the weight, resin parts (resin pipes) and metal parts (metal housings) are combined. Exterior parts have been developed (see patent documents below).

外装部品を製造する方法(樹脂部品と金属部品を接合する方法)として、例えば、樹脂パイプの端面に突出する被嵌合部を形成する一方で、金属部品の方に穴状の嵌合部を形成し、被嵌合部を嵌合部内に挿入して嵌合させる方法が挙げられる。このような方法において、被嵌合部を嵌合部内に挿入する際、樹脂パイプが必要以上に嵌合部内に挿入されないようにするため、被嵌合部が形成された樹脂パイプの端面が金属部品に突き当たるように構成される。 As a method of manufacturing an exterior part (a method of joining a resin part and a metal part), for example, while forming a fitted portion protruding from the end face of a resin pipe, a hole-shaped fitting portion is formed toward the metal part. Examples thereof include a method of forming and inserting the fitted portion into the fitting portion to fit the fitting portion. In such a method, when the fitted portion is inserted into the fitting portion, the end face of the resin pipe on which the fitted portion is formed is made of metal so that the resin pipe is not inserted into the fitting portion more than necessary. It is configured to hit a part.

特開2015-145100号公報JP-A-2015-145100

しかしながら、上記構造によれば、外装部品に軸方向(嵌合方向)荷重、ねじり荷重、及び曲げ荷重(以下、これらをまとめて単に荷重と称する)が作用すると、被嵌合部と端面(金属部品と突き当たる面)とが交わる隅部に応力が集中し易い。 However, according to the above structure, when an axial (fitting direction) load, a torsional load, and a bending load (hereinafter, these are collectively simply referred to as a load) act on the exterior parts, the fitted portion and the end face (metal). Stress tends to concentrate in the corner where the part (the surface that abuts) intersects.

本発明は、このような課題を解決するために創作されたものであり、隅部に応力が集中し難い外装部品及びその外装部品の製造方法を提供することを目的とする。 The present invention has been created to solve such a problem, and an object of the present invention is to provide an exterior component in which stress is unlikely to be concentrated in a corner portion and a method for manufacturing the exterior component.

前記課題を解決するため、本発明に係る外装部品は、筒状の樹脂部品と筒状の金属部品とを接合して成り、車両の車輪の転舵を行う転舵軸を収容する外装部品であって、前記樹脂部品の端面には、被嵌合部が形成され、前記金属部品には、前記被嵌合部に嵌合する嵌合部と、前記端面に突き当たる突き当て面と、が形成され、前記樹脂部品の端面と前記被嵌合部とで構成される隅部、及びに前記金属部品の突き当て面と前記嵌合部とで構成される角部は、R形状となっていることを特徴とする。 In order to solve the above problems, the exterior part according to the present invention is an exterior part formed by joining a tubular resin part and a tubular metal part and accommodating a steering shaft for steering the wheels of a vehicle. A fitted portion is formed on the end surface of the resin part, and the metal part is formed with a fitting portion that fits on the fitted portion and an abutting surface that abuts on the end face. The corner portion formed by the end face of the resin part and the fitted portion, and the corner portion formed of the abutting surface of the metal part and the fitting portion are R-shaped. It is characterized by that.

前記課題を解決するため、本発明に係る外装部品の製造方法は、筒状の樹脂部品と筒状の金属部品とを接合して成り、車両の車輪の転舵を行う転舵軸を収容する外装部品の製造方法であって、前記樹脂部品及び前記金属部品のうち一方の部品には、端面から突出する被嵌合部が形成され、前記樹脂部品及び前記金属部品のうち他方の部品には、前記被嵌合部に嵌合する嵌合部及び前記端面に突き当たる突き当て面が形成され、前記端面と前記被嵌合部とで構成される隅部、及びに前記突き当て面と前記嵌合部とで構成される角部がR形状となっており、熱可塑性樹脂製の前記樹脂部品及び前記金属部品を準備する準備工程と、前記被嵌合部に嵌合部を嵌合する嵌合工程と、前記被嵌合部と前記嵌合部を嵌合した状態で、外的加熱装置により前記被嵌合部又は前記嵌合部に加圧力を加えながら前記樹脂部品に形成された前記被嵌合部又は前記嵌合部を溶融させ、前記被嵌合部と前記嵌合部とを溶着する溶着工程と、を含むことを特徴とする。 In order to solve the above problems, the method for manufacturing an exterior part according to the present invention is formed by joining a tubular resin part and a tubular metal part, and accommodates a steering shaft for steering the wheels of a vehicle. In a method for manufacturing an exterior part, one of the resin part and the metal part is formed with a fitted portion protruding from an end face, and the other part of the resin part and the metal part is formed. , The fitting portion to be fitted to the fitted portion and the abutting surface to be abutted against the end face are formed, and the abutting surface and the fitting surface are formed in a corner portion formed by the end face and the fitted portion. The corner portion formed by the joint portion has an R shape, and the preparatory step for preparing the resin part and the metal part made of thermoplastic resin and the fitting for fitting the fitting portion to the fitting portion. The said resin part formed on the resin part while applying a pressing force to the fitted portion or the fitting portion by an external heating device in a state where the fitting portion and the fitting portion are fitted in the joining step. It is characterized by including a welding step of melting the fitted portion or the fitting portion and welding the fitted portion and the fitting portion.

前記課題を解決するため、本発明に係る外装部品の製造方法は、筒状の樹脂部品と筒状の金属部品とを接合して成り、車両の車輪の転舵を行う転舵軸を収容する外装部品の製造方法であって、前記樹脂部品及び前記金属部品のうち一方の部品には、端面から突出する被嵌合部が形成され、前記樹脂部品及び前記金属部品のうち他方の部品には、前記被嵌合部に嵌合する嵌合部及び前記端面に突き当たる突き当て面が形成され、前記端面と前記被嵌合部とで構成される隅部、及びに前記突き当て面と前記嵌合部とで構成される角部がR形状となっており、前記金属部品を準備する準備工程と、前記金属部品を金型内に配置する配置する配置工程と、前記金型内に樹脂を射出して前記樹脂部品を成形するインサート成形工程と、を含むことを特徴とする。 In order to solve the above problems, the method for manufacturing an exterior part according to the present invention is formed by joining a tubular resin part and a tubular metal part, and accommodates a steering shaft for steering the wheels of a vehicle. In a method for manufacturing an exterior part, one of the resin part and the metal part is formed with a fitted portion protruding from an end face, and the other part of the resin part and the metal part is formed. , The fitting portion to be fitted to the fitted portion and the abutting surface to be abutted against the end face are formed, and the abutting surface and the fitting surface are formed in a corner portion formed by the end face and the fitted portion. The corner portion composed of the joint portion has an R shape, and a preparatory step for preparing the metal part, an arrangement step for arranging the metal part in the mold, and a resin in the mold. It is characterized by including an insert molding step of injecting and molding the resin part.

本発明によれば、外装部品に対し荷重が作用すると、応力が径方向外側に分散し、外装部品の耐久性が向上する。また、本発明の製造方法によれば、樹脂部品と金属部品との固定強度が高くなる。 According to the present invention, when a load acts on an exterior component, the stress is dispersed outward in the radial direction, and the durability of the exterior component is improved. Further, according to the manufacturing method of the present invention, the fixing strength between the resin part and the metal part is increased.

第1実施形態の操舵装置を模式的に示した模式図である。It is a schematic diagram which shows typically the steering apparatus of 1st Embodiment. 第1実施形態の外装部品の左端部を軸方向に切り、その断面を拡大した拡大断面図である。It is an enlarged cross-sectional view which cut the left end part of the exterior part of 1st Embodiment in the axial direction, and enlarged the cross section. 第1実施形態の外装部品の第1変形例を示す断面拡大図である。It is sectional drawing which shows the 1st modification of the exterior part of 1st Embodiment. 第1実施形態の外装部品の第2変形例を示す断面拡大図である。It is sectional drawing which shows the 2nd modification of the exterior part of 1st Embodiment. 第2実施形態の外装部品の左端部を軸方向に切り、その断面を拡大した拡大断面図である。It is an enlarged cross-sectional view which cut the left end part of the exterior part of 2nd Embodiment in the axial direction, and enlarged the cross section. 超音波溶着機を用いた溶着工程を示す概略図である。It is a schematic diagram which shows the welding process using an ultrasonic welding machine. 加圧装置と高周波誘導装置を用いた溶着工程を示す概略図である。It is a schematic diagram which shows the welding process using a pressurizing apparatus and a high frequency induction apparatus. 実施例及び比較例の試験結果を示すグラフである。It is a graph which shows the test result of an Example and a comparative example.

次に本発明の各実施形態について図面を参照しながら説明する。また、各実施形態において、技術的に同一要素について同一の符号を付し、詳細な説明を省略する。 Next, each embodiment of the present invention will be described with reference to the drawings. Further, in each embodiment, technically the same elements are designated by the same reference numerals, and detailed description thereof will be omitted.

(操舵装置)
図1に示すように、操舵装置1は、運転者が操作するステアリングホイール2と、ステアリングホイール2と一体で回転するステアリング軸3と、ステアリング軸3の下端に連結されたトーションバー4と、トーションバー4の下端に連結され下端にピニオン5aを有するピニオン軸5と、ピニオン5aに歯合するラック6aを有するラック軸(転舵軸)6と、ラック軸6の両端に固定されたラックエンド7,7に連結するラックエンドスタッド8,8と、ラック軸6を収容する外装部品9と、を備える。また、ラックエンドスタッド8、8には操舵輪(不図示)が連結され、運転手がステアリングホイール2を回転させると、ラック軸6が左方又は右方へ移動し、操舵輪を操舵することができる。
(Steering device)
As shown in FIG. 1, the steering device 1 includes a steering wheel 2 operated by a driver, a steering shaft 3 that rotates integrally with the steering wheel 2, a torsion bar 4 connected to the lower end of the steering shaft 3, and a torsion. A pinion shaft 5 connected to the lower end of the bar 4 and having a pinion 5a at the lower end, a rack shaft (steering shaft) 6 having a rack 6a meshing with the pinion 5a, and rack ends 7 fixed to both ends of the rack shaft 6. , 7 are provided with rack end studs 8 and 8 and an exterior component 9 for accommodating the rack shaft 6. Further, steering wheels (not shown) are connected to the rack end studs 8 and 8, and when the driver rotates the steering wheel 2, the rack shaft 6 moves to the left or right to steer the steering wheels. Can be done.

外装部品9は、樹脂パイプであるラックカバー10と、ラックカバー10の両端に接合された金属製の左右のハウジング20,20と、を備えており、樹脂部品と金属部品とを接合して成る。 The exterior component 9 includes a rack cover 10 which is a resin pipe, and metal housings 20 and 20 joined to both ends of the rack cover 10, and is formed by joining the resin component and the metal component. ..

ラックカバー10は、ラック軸6を収容し保護する部品である。ラックカバー10は、円筒状に形成されており、ラックカバー10の左端面11(図2参照)及び右端面(不図示)は、リング状に形成されている。また、ラックカバー10において、径方向の肉厚L1(内径から外径までの長さ。図2参照)が6mmに形成されている。
なお、第1実施形態のラックカバー10において、ラックカバー10を形成する樹脂の種類について特に限定されず、樹脂内に強化繊維を含んだ繊維強化樹脂により形成されてもよい。
The rack cover 10 is a component that accommodates and protects the rack shaft 6. The rack cover 10 is formed in a cylindrical shape, and the left end surface 11 (see FIG. 2) and the right end surface (not shown) of the rack cover 10 are formed in a ring shape. Further, in the rack cover 10, the wall thickness L1 in the radial direction (the length from the inner diameter to the outer diameter; see FIG. 2) is formed to be 6 mm.
In the rack cover 10 of the first embodiment, the type of resin forming the rack cover 10 is not particularly limited, and the rack cover 10 may be formed of a fiber-reinforced resin containing reinforcing fibers in the resin.

左右のハウジング20,20のうち左側のハウジング20は、ラックカバー10の端部を保護するための部品であり、右側のハウジング20は、ピニオン5aとラック6aとの歯合部分を収容し保護するための部品である。左右のハウジング20,20のそれぞれには、ラック軸6を配置するため、左右に延在する貫通孔21が形成されている。なお、当該貫通孔21は、後述する嵌合部を構成する。 Of the left and right housings 20 and 20, the left housing 20 is a part for protecting the end portion of the rack cover 10, and the right housing 20 accommodates and protects the toothed portion between the pinion 5a and the rack 6a. It is a part for. In order to arrange the rack shaft 6 in each of the left and right housings 20 and 20, through holes 21 extending to the left and right are formed. The through hole 21 constitutes a fitting portion described later.

また、ラックカバー10と左右のハウジング20,20とは、嵌合により接合している。以下、嵌合構造について説明するが、ラックカバー10の左端部と左側のハウジング20の嵌合構造と、ラックカバー10の右端部と右側のハウジング20の嵌合構造は同一である。よって、ラックカバー10の左端部と左側のハウジング20との嵌合構造を代表例として説明し、ラックカバー10の右端部と右側のハウジング20の嵌合構造の説明は省略する。 Further, the rack cover 10 and the left and right housings 20 and 20 are joined by fitting. Hereinafter, the fitting structure will be described, but the fitting structure of the left end portion of the rack cover 10 and the housing 20 on the left side and the fitting structure of the right end portion of the rack cover 10 and the housing 20 on the right side are the same. Therefore, the fitting structure between the left end portion of the rack cover 10 and the housing 20 on the left side will be described as a typical example, and the description of the fitting structure between the right end portion of the rack cover 10 and the housing 20 on the right side will be omitted.

図2に示すように、ラックカバー10の左端面11には、左方に突出する円筒状の被嵌合部12が形成されている。被嵌合部12は、内径がラックカバー10の内径と同一に形成され、外径がラックカバー10の外径より小径に形成されている。
なお、本実施形態において、左端面11の径方向の長さH(図2参照)は4mmとなっている。
As shown in FIG. 2, a cylindrical fitted portion 12 projecting to the left is formed on the left end surface 11 of the rack cover 10. The inner diameter of the fitted portion 12 is formed to be the same as the inner diameter of the rack cover 10, and the outer diameter is formed to be smaller than the outer diameter of the rack cover 10.
In the present embodiment, the radial length H (see FIG. 2) of the left end surface 11 is 4 mm.

被嵌合部12は、左側のハウジング20の貫通孔(嵌合部)21内に挿入され内嵌し、ラックカバー10と左側のハウジング20とが一体になっている。なお、被嵌合部12の外径は、ハウジング20の貫通孔21の径より僅かに大径に形成され、締め代が確保されている。
さらに、被嵌合部12の挿入時、ラックカバー10の左端面11がハウジング20の右端面に突き当たり、左端面11がハウジング20の右端面に当接した状態で接合している。以下、ハウジング20の右端面のうちラックカバー10の左端面11と当接する範囲を突き当て面22という。
The fitted portion 12 is inserted into the through hole (fitting portion) 21 of the left housing 20 and fitted inward, and the rack cover 10 and the left housing 20 are integrated. The outer diameter of the fitted portion 12 is formed to be slightly larger than the diameter of the through hole 21 of the housing 20, and a tightening allowance is secured.
Further, when the fitted portion 12 is inserted, the left end surface 11 of the rack cover 10 abuts on the right end surface of the housing 20, and the left end surface 11 is in contact with the right end surface of the housing 20. Hereinafter, the range of the right end surface of the housing 20 that comes into contact with the left end surface 11 of the rack cover 10 is referred to as an abutting surface 22.

ラックカバー10の隅部13(左端面11と被嵌合部12の外周面12aとが交わる部位)は、R形状を呈し、断面視で円弧状となっている。
同様に、ハウジング20の角部23(突き当て面22と貫通孔21の内周面21aとが交わる部位)は、R形状を呈し、断面視で円弧状となっている。
また、隅部13と角部23におけるR形状の曲率半径は、互いに同じ値に設定されている。このため、隅部13と角部23は、互いに倣った形状で対応しており、互いに隙間なく当接している。
The corner portion 13 of the rack cover 10 (the portion where the left end surface 11 and the outer peripheral surface 12a of the fitted portion 12 intersect) has an R shape and is arcuate in cross-sectional view.
Similarly, the corner portion 23 of the housing 20 (the portion where the abutting surface 22 and the inner peripheral surface 21a of the through hole 21 intersect) has an R shape and is arcuate in cross-sectional view.
Further, the radius of curvature of the R shape at the corner portion 13 and the corner portion 23 is set to the same value. Therefore, the corners 13 and the corners 23 correspond to each other in a shape that imitates each other, and are in contact with each other without a gap.

また、本実施形態において、R形状の曲率半径は4mmに設定され、左端面11の径方向の長さHと同じ値になっている。このため、ラックカバー10の左端面11の全部が隅部13に含まれ円弧状となっている。同様に、ハウジング20の突き当て面22の全部が角部23に含まれ円弧状になっている。 Further, in the present embodiment, the radius of curvature of the R shape is set to 4 mm, which is the same value as the radial length H of the left end surface 11. Therefore, the entire left end surface 11 of the rack cover 10 is included in the corner portion 13 and has an arc shape. Similarly, the entire abutting surface 22 of the housing 20 is included in the corner portion 23 and has an arc shape.

次に作用効果について説明する。
上記した外装部品9の左側のハウジング20に対し、例えば右方(嵌合方向)への荷重が作用すると、その荷重がラックカバー10の左端部に伝達され、ラックカバー10の左端部に応力が発生する。
ここで、隅部及び角部が直角に形成された従来の構造によれば、ラックカバーの左端面の最内径の部位、つまり、隅部に応力が集中し大きな荷重が作用した。
しかしながら、本実施形態によれば、ラックカバー10の隅部13がR形状に形成され、ラックカバー10の左端部に発生する応力は、隅部13(左端面11)における径方向外寄りの部位に分散し易い。この結果、隅部13(左端面11)における径方向全域に応力が分散するようになり、ラックカバー10の耐久性が向上する。
Next, the action and effect will be described.
When, for example, a load acts on the housing 20 on the left side of the exterior component 9 to the right (fitting direction), the load is transmitted to the left end of the rack cover 10 and stress is applied to the left end of the rack cover 10. Occur.
Here, according to the conventional structure in which the corners and the corners are formed at right angles, stress is concentrated on the innermost innermost portion of the left end surface of the rack cover, that is, the corners, and a large load is applied.
However, according to the present embodiment, the corner portion 13 of the rack cover 10 is formed in an R shape, and the stress generated at the left end portion of the rack cover 10 is a portion outward in the radial direction in the corner portion 13 (left end surface 11). Easy to disperse. As a result, the stress is dispersed over the entire radial direction in the corner portion 13 (left end surface 11), and the durability of the rack cover 10 is improved.

以上、第1実施形態について説明したが、本発明は、第1実施形態で示した数値に限定されるものでない。つまり、本発明において、左端面11における径方向の長さHが4mm以外に設定されてもよく、また、ラックカバー10の厚みL1が6mm以外のものであってもよく、さらには、R形状の曲率半径が4mm以外に設定されてもよい。 Although the first embodiment has been described above, the present invention is not limited to the numerical values shown in the first embodiment. That is, in the present invention, the radial length H of the left end surface 11 may be set to other than 4 mm, the thickness L1 of the rack cover 10 may be other than 6 mm, and further, the R shape. The radius of curvature of may be set to other than 4 mm.

また、第1実施形態において、R形状の曲率半径は、左端面11における径方向長さHと同じ値(4mm)となっているが、左端面11における径方向の長さHよりも小さく設定されてもよく、又は左端面11における径方向の長さHよりも大きく設定されてもよい。 Further, in the first embodiment, the radius of curvature of the R shape is the same value (4 mm) as the radial length H on the left end surface 11, but is set smaller than the radial length H on the left end surface 11. It may be set to be larger than the radial length H on the left end surface 11.

ただし、R形状の曲率半径が左端面11の径方向の長さHよりも小さいと、隅部13(左端面11)の径方向外寄りの部位に応力が分散し難い。一方で、R形状の曲率半径が左端面11の径方向長さHよりも極めて大きいと、隅部13(左端面11)の径方向外寄りの部位に応力が集中するおそれがある。よって、R形状の曲率半径は、左端面11における径方向の長さHとの関係で下記の式(1)を満たすことが好ましい。 However, if the radius of curvature of the R shape is smaller than the radial length H of the left end surface 11, stress is difficult to disperse in the radial outer portion of the corner portion 13 (left end surface 11). On the other hand, if the radius of curvature of the R shape is extremely larger than the radial length H of the left end surface 11, stress may be concentrated on a portion of the corner portion 13 (left end surface 11) that is radially outward. Therefore, it is preferable that the radius of curvature of the R shape satisfies the following equation (1) in relation to the radial length H on the left end surface 11.

1≦(r/H)≦2・・・・・式(1)
r:曲率半径[mm]
H:端面の径方向の長さ[mm]
1 ≤ (r / H) ≤ 2 ... Equation (1)
r: Radius of curvature [mm]
H: Length of the end face in the radial direction [mm]

また、第1実施形態では、ラックカバー10の被嵌合部12がハウジング20の貫通孔(嵌合部)21に内嵌される例を挙げたが、図3に示すように、外装部品9Aにおいて、ラックカバー10Aの被嵌合部12Aがハウジング20Aの右端部20aに外嵌される外装部品9Aに本発明を適用してもよい。なお、図3に示す外装部品9Aにおいて、ラックカバー10Aの隅部13Aとハウジング20Aの角部23Aとは、互いに対応するR形状となっている。
そして、このような外装部品9Aであっても、ラックカバー10Aの左端部に発生する応力は、隅部13A(左端面11A)の径方向内寄りの部位に分散し易く、ラックカバー10の耐久性が向上する。
Further, in the first embodiment, an example in which the fitted portion 12 of the rack cover 10 is internally fitted into the through hole (fitting portion) 21 of the housing 20 has been given, but as shown in FIG. 3, the exterior component 9A The present invention may be applied to an exterior component 9A in which the fitted portion 12A of the rack cover 10A is externally fitted to the right end portion 20a of the housing 20A. In the exterior component 9A shown in FIG. 3, the corner portion 13A of the rack cover 10A and the corner portion 23A of the housing 20A have an R shape corresponding to each other.
Even with such an exterior component 9A, the stress generated at the left end of the rack cover 10A is easily dispersed in the radial inward portion of the corner 13A (left end surface 11A), and the durability of the rack cover 10 is durable. Improves sex.

また、第1実施形態及び上記変形例では、ラックカバー(樹脂部品)10に段付き加工されてラックカバー10に左端面11から突出する被嵌合部12が形成され、ハウジング(金属部品)20に嵌合部(貫通孔)21及び突き当て面22が形成されているが、本発明はこれに限定されない。
例えば、図4に示すように、ハウジング(金属部品)120に段付き加工されてハウジング120に右端面121から突出する被嵌合部122が形成され、ラックカバー(樹脂部品)110に嵌合部111及び突き当て面112が形成され、そして、右端面121と被嵌合部122とで構成される隅部123、及びに突き当て面112と嵌合部111とで構成される角部113がR形状となっている外装部材109であってもよい。
この変形例によれば、隅部123に作用する応力が径方向外寄りの部位に分散し易く、ハウジング120の耐久性が向上する。なお、このような変形例における右端面(端面)121の径方向の長さHは、ハウジング120の外径と被嵌合部122の外径との差分となる。
また、このような変形例であってもハウジング(金属部品)120の被嵌合部122は、ラックカバー(樹脂部品)110の嵌合部111に外嵌される例に限定されず、内嵌されてもよい。
Further, in the first embodiment and the above-described modification, the rack cover (resin component) 10 is stepped to form a fitted portion 12 protruding from the left end surface 11 on the rack cover 10, and the housing (metal component) 20 is formed. The fitting portion (through hole) 21 and the abutting surface 22 are formed on the surface, but the present invention is not limited thereto.
For example, as shown in FIG. 4, the housing (metal part) 120 is stepped to form a fitted portion 122 protruding from the right end surface 121 on the housing 120, and the fitting portion 122 is formed on the rack cover (resin part) 110. 111 and the abutting surface 112 are formed, and a corner portion 123 composed of the right end surface 121 and the fitted portion 122, and a corner portion 113 composed of the abutting surface 112 and the fitting portion 111 are formed. The exterior member 109 having an R shape may be used.
According to this modification, the stress acting on the corner portion 123 is easily dispersed in the portion outward in the radial direction, and the durability of the housing 120 is improved. The length H in the radial direction of the right end surface (end surface) 121 in such a modification is the difference between the outer diameter of the housing 120 and the outer diameter of the fitted portion 122.
Further, even in such a modified example, the fitted portion 122 of the housing (metal component) 120 is not limited to the example of being externally fitted to the fitting portion 111 of the rack cover (resin component) 110, and is internally fitted. May be done.

また、第1実施形態の外装部品9は、ラックカバー10の被嵌合部12をハウジング20の貫通孔(嵌合部)21に嵌合し接合しているが、接着剤等を使用することを排除するものではない。以下、接着剤を使用した第2実施形態について説明する。 Further, in the exterior component 9 of the first embodiment, the fitted portion 12 of the rack cover 10 is fitted and joined to the through hole (fitting portion) 21 of the housing 20, but an adhesive or the like is used. Does not exclude. Hereinafter, the second embodiment using the adhesive will be described.

(第2実施形態)
図5に示すように、第2実施形態の外装部品9Bにおいて、ラックカバー10Bの被嵌合部12Bの外周面12aと、左側のハウジング20Bの貫通孔21Bの内周面21aとの間に、外周面12aと内周面21aとを接着する接着層15が設けられている。
この接着層15は、被嵌合部12Bを貫通孔21Bに挿入する前に被嵌合部12Bの外周面12aに接着剤を塗布し、被嵌合部12Bを貫通孔21Bに挿入した後に接着剤を硬化させることで形成されている。
また、この接着層15は、ラックカバー10Bの隅部13B(隅部13Bに左端面11Bが含まれる)とハウジング20Bの角部23B(角部23Bに突き当て面22Bが含まれる)との間にも介在している。
(Second Embodiment)
As shown in FIG. 5, in the exterior component 9B of the second embodiment, between the outer peripheral surface 12a of the fitted portion 12B of the rack cover 10B and the inner peripheral surface 21a of the through hole 21B of the left housing 20B. An adhesive layer 15 for adhering the outer peripheral surface 12a and the inner peripheral surface 21a is provided.
The adhesive layer 15 is bonded after applying an adhesive to the outer peripheral surface 12a of the fitted portion 12B before inserting the fitted portion 12B into the through hole 21B and inserting the fitted portion 12B into the through hole 21B. It is formed by curing the agent.
Further, the adhesive layer 15 is provided between the corner portion 13B of the rack cover 10B (the corner portion 13B includes the left end surface 11B) and the corner portion 23B of the housing 20B (the corner portion 23B includes the abutting surface 22B). It also intervenes.

上記した外装部品9Bにおいても、ラックカバー10Bの左端部に発生する応力は、隅部13Bの径方向外寄りの部位(左端面11Bの径方向外寄りの部分)に分散し易くなり、ラックカバー10Bの耐久性が向上する。また、接着層15によりラックカバー10Bとハウジング20Bとの固定強度が向上し、ハウジング20Bが被嵌合部12Bから脱落し難くなる。 Also in the exterior component 9B described above, the stress generated at the left end portion of the rack cover 10B is easily dispersed in the radial outer portion of the corner portion 13B (the radial outer portion of the left end surface 11B), and the rack cover The durability of 10B is improved. Further, the adhesive layer 15 improves the fixing strength between the rack cover 10B and the housing 20B, and makes it difficult for the housing 20B to fall off from the fitted portion 12B.

以上、第2実施形態では、被嵌合部12Bと貫通孔(嵌合部)21Bの嵌合の他に接着剤(接着層15)を使用してラックカバー10Bとハウジング20Bとを接合した例を挙げたが、本発明においては、被嵌合部12と貫通孔(嵌合部)21との間に溶融した樹脂を注入し、その樹脂を硬化させてラックカバー10とハウジング20とを溶着してもよい。または、ラックカバー10の成形時にハウジング20をインサートすることで接合してもよく、このようなインサート成形による外装部品の製造方法は、金属部品20を準備する準備工程と、金属部品20を金型内に配置する配置する配置工程と、金型内に樹脂を射出して樹脂部品10を成形するインサート成形工程とを含んでなる。次にラックカバー10とハウジング20とを溶着(接合)して外装部品9を製造する方法を説明する。 As described above, in the second embodiment, in addition to fitting the fitted portion 12B and the through hole (fitting portion) 21B, the rack cover 10B and the housing 20B are joined by using an adhesive (adhesive layer 15). However, in the present invention, a molten resin is injected between the fitted portion 12 and the through hole (fitting portion) 21, and the resin is cured to weld the rack cover 10 and the housing 20. You may. Alternatively, the housing 20 may be joined by inserting the housing 20 at the time of molding the rack cover 10, and the method of manufacturing an exterior part by such insert molding includes a preparatory step for preparing the metal part 20 and a mold for the metal part 20. It includes an arranging step of arranging the resin parts 10 inside and an insert molding step of injecting resin into the mold to form the resin component 10. Next, a method of welding (joining) the rack cover 10 and the housing 20 to manufacture the exterior component 9 will be described.

(製造方法)
外装部品9の製造方法は、準備工程と、嵌合工程と、溶着工程と、を含んでいる。
(Production method)
The method for manufacturing the exterior component 9 includes a preparation step, a fitting step, and a welding step.

(準備工程)
準備工程は、被嵌合部12を有するラックカバー10と、被嵌合部12に嵌合可能な嵌合部(貫通孔21)を有する左右のハウジング20,20と、を準備する工程である。
なお、ラックカバー10及び左右のハウジング20,20の形状は、第1実施形態で説明しているため、相違点に絞って説明する。
(Preparation process)
The preparation step is a step of preparing the rack cover 10 having the fitted portion 12 and the left and right housings 20 and 20 having the fitting portions (through holes 21) that can be fitted to the fitted portion 12. ..
Since the shapes of the rack cover 10 and the left and right housings 20 and 20 have been described in the first embodiment, the differences will be mainly described.

ラックカバー10の製造に使用される樹脂は、所定温度で溶融可能な熱可塑性樹脂である。なお、熱可塑性樹脂としては、ポリエチレン(PE),ポリプロピレン(PP),ポリフェニレンスルファイド(PPS),ポリエーテルケトン(PEEK)などの熱可塑性樹脂が挙げられるが、本発明において特に限定されない。また、熱可塑性樹脂内に強化繊維を含んだ繊維強化樹脂により形成されてもよい。 The resin used for manufacturing the rack cover 10 is a thermoplastic resin that can be melted at a predetermined temperature. Examples of the thermoplastic resin include thermoplastic resins such as polyethylene (PE), polypropylene (PP), polyphenylene sulfide (PPS), and polyetherketone (PEEK), but the present invention is not particularly limited. Further, it may be formed of a fiber-reinforced resin containing reinforcing fibers in the thermoplastic resin.

なお、ラックカバー10と左右のハウジング20,20を準備した後、これらを洗浄して乾燥させる洗浄・乾燥工程とを行うことが好ましい。当該工程によれば、被嵌合部12及び嵌合部(貫通孔21の内周面21a)に付着する異物等が除去され、後の溶着工程において被嵌合部12と貫通孔21との溶着強度を高めることができる。 After preparing the rack cover 10 and the left and right housings 20 and 20, it is preferable to perform a washing / drying step of washing and drying them. According to this step, foreign matter and the like adhering to the fitted portion 12 and the fitting portion (inner peripheral surface 21a of the through hole 21) are removed, and in the subsequent welding step, the fitted portion 12 and the through hole 21 are connected to each other. Welding strength can be increased.

(嵌合工程)
嵌合工程は、ラックカバー10の被嵌合部12をハウジング20の貫通孔21内に圧入し、被嵌合部12を貫通孔21に嵌合させる工程である。本工程においては、ラックカバー10を固定するための治具や、ハウジング20を押し込むための治具を用いたりしてもよく、圧入する方法は特に限定されない。
(Mating process)
The fitting step is a step of press-fitting the fitted portion 12 of the rack cover 10 into the through hole 21 of the housing 20 and fitting the fitted portion 12 into the through hole 21. In this step, a jig for fixing the rack cover 10 or a jig for pushing the housing 20 may be used, and the press-fitting method is not particularly limited.

(溶着工程)
図6に示すように、溶着工程は、被嵌合部12と貫通孔(嵌合部)21を嵌合した状態で、外的加熱装置によりハウジング20に加圧力を加えながらラックカバー10の被嵌合部12の外周面(被嵌合面)12aを溶融させ、被嵌合部12と貫通孔(嵌合部)21とを溶着する工程である。
(Welding process)
As shown in FIG. 6, in the welding step, with the fitted portion 12 and the through hole (fitting portion) 21 fitted, the rack cover 10 is covered while applying pressure to the housing 20 by an external heating device. This is a step of melting the outer peripheral surface (fitted surface) 12a of the fitting portion 12 and welding the fitted portion 12 and the through hole (fitting portion) 21.

外的加熱装置は、溶融させる部位(被嵌合部12の外周面12a)に接触することなく溶融させることができる装置である。本実施形態では、外的加熱装置として超音波溶着機を用いている。
超音波溶着機は、被嵌合部12と貫通孔21との接触面で摩擦熱を発生させて樹脂を溶融させる摩擦熱溶着装置の一つであり、具体的には電気エネルギを機械的振動エネルギに変換し、ホーン30を介して機械的振動を部品に伝達して部品同士の接触面で摩擦熱を発生させる装置である。そのほか、超音波溶着機は、上記振動機能の他に、ホーン30に当接する部品を加圧する加圧機能を有している。
The external heating device is a device capable of melting without coming into contact with the part to be melted (the outer peripheral surface 12a of the fitted portion 12). In this embodiment, an ultrasonic welding machine is used as an external heating device.
The ultrasonic welding machine is one of the frictional heat welding devices that generate frictional heat at the contact surface between the mated portion 12 and the through hole 21 to melt the resin. Specifically, the electric energy is mechanically vibrated. It is a device that converts into energy and transmits mechanical vibration to parts via a horn 30 to generate frictional heat at the contact surfaces between parts. In addition to the vibration function described above, the ultrasonic welding machine also has a pressurizing function of pressurizing a component in contact with the horn 30.

溶着工程においては、図6に示すように、最初にラックカバー10を固定用治具40に取り付け、ラックカバー10の固定を行う。なお、固定用治具40は、固定台41に立設された支柱部42と、支柱部42の上方で上下方向からラックカバー10を挟持する一対の挟持部43,43とを備える。 In the welding step, as shown in FIG. 6, the rack cover 10 is first attached to the fixing jig 40, and the rack cover 10 is fixed. The fixing jig 40 includes a support column 42 erected on the fixing base 41 and a pair of holding portions 43, 43 that sandwich the rack cover 10 from above and below the support column 42.

次に、ハウジング20の外周面に超音波溶着機のホーン30を当接させる。なお、本実施形態においては、ハウジング20の外周面のうち上側に位置する上部20bに当接している。
次に、超音波溶着機を起動させる。これにより、ホーン30は、ハウジング20の上部20bを下方に押圧する加圧力(図6の矢印参照)を発揮するとともに、ホーン30がハウジング20の上部20bに対し垂直方向(上下方向)に振動する。
この結果、ホーン30の振動がハウジング20に伝達し、ハウジング20の内周側の上面21bと、これに対向する被嵌合部12の外周側の上面12bとの界面で摩擦熱が発生する。そして、摩擦熱が所定温度を超えると、被嵌合部12の上面12bが溶融する。
被嵌合部12の上面12bが溶融した後は、ホーン30を当てる位置を周方向に移動させる。これにより、溶融した樹脂が凝固し、ハウジング20の上面21bと被嵌合部12の上面12bとが溶着する。
Next, the horn 30 of the ultrasonic welding machine is brought into contact with the outer peripheral surface of the housing 20. In this embodiment, the housing 20 is in contact with the upper portion 20b located on the upper side of the outer peripheral surface of the housing 20.
Next, the ultrasonic welding machine is started. As a result, the horn 30 exerts a pressing force (see the arrow in FIG. 6) that presses the upper portion 20b of the housing 20 downward, and the horn 30 vibrates in the vertical direction (vertical direction) with respect to the upper portion 20b of the housing 20. ..
As a result, the vibration of the horn 30 is transmitted to the housing 20, and frictional heat is generated at the interface between the upper surface 21b on the inner peripheral side of the housing 20 and the upper surface 12b on the outer peripheral side of the fitted portion 12 facing the upper surface 21b. Then, when the frictional heat exceeds a predetermined temperature, the upper surface 12b of the fitted portion 12 is melted.
After the upper surface 12b of the fitted portion 12 is melted, the position where the horn 30 is applied is moved in the circumferential direction. As a result, the molten resin is solidified, and the upper surface 21b of the housing 20 and the upper surface 12b of the fitted portion 12 are welded.

このように、ハウジング20の外周面に対し、ホーン30を当てる位置を周方向に移動させて被嵌合部12と貫通孔(嵌合部)21との全周を溶着する。そして、被嵌合部12と貫通孔(嵌合部)21との全周が溶着したら、外装部品9(接合体)が完成する。 In this way, the position where the horn 30 is applied is moved in the circumferential direction with respect to the outer peripheral surface of the housing 20, and the entire circumference of the fitted portion 12 and the through hole (fitting portion) 21 is welded. Then, when the entire circumference of the fitted portion 12 and the through hole (fitting portion) 21 is welded, the exterior component 9 (joint body) is completed.

上記の製造方法によれば、金型の抜く方向を考慮する必要がなく、外装部品9を製造でき、設計の自由度が高くなる。 According to the above manufacturing method, it is not necessary to consider the direction in which the mold is pulled out, the exterior part 9 can be manufactured, and the degree of freedom in design is increased.

なお、上記した実施形態において、摩擦熱溶着装置として、ハウジング20の外周面に対し垂直方向に振動する超音波溶着装置を用いた例を挙げたが、ハウジング20の外周面に対し面方向に振動して摩擦熱を発生させる超音波溶着装置であってもよい。
また、本発明の外的加熱装置は、摩擦熱溶着装置(超音波溶着装置)に限定されず、電磁誘導によりハウジング20を発熱させる高周波誘導装置を用いることも可能である。
以下、上記した外装部品9の製造方法の変形例であって、高周波誘導装置を用いた溶着工程について説明する。
In the above-described embodiment, an example in which an ultrasonic welding device that vibrates in the direction perpendicular to the outer peripheral surface of the housing 20 is used as the frictional heat welding device has been given, but the device vibrates in the surface direction with respect to the outer peripheral surface of the housing 20. It may be an ultrasonic welding device that generates frictional heat.
Further, the external heating device of the present invention is not limited to the friction heat welding device (ultrasonic welding device), and it is also possible to use a high frequency induction device that heats the housing 20 by electromagnetic induction.
Hereinafter, a modification of the method for manufacturing the exterior component 9 described above, the welding process using the high frequency induction device, will be described.

図7に示すように、変形例に係る溶着工程において、外的加熱装置は、ハウジング20又は被嵌合部12に加圧力を加えるための加圧装置50と、ハウジング20を発熱させるための高周波誘導装置とを備えている。
高周波誘導装置は、環状のコイル部60を備え、コイル部60内に金属部品であるハウジング20を配置し、電磁誘導によりハウジング20に渦電流を発生させてハウジング20を発熱させる装置である。
As shown in FIG. 7, in the welding step according to the modified example, the external heating device includes a pressurizing device 50 for applying a pressing force to the housing 20 or the fitted portion 12, and a high frequency for heating the housing 20. It is equipped with a guidance device.
The high-frequency induction device is a device provided with an annular coil portion 60, a housing 20 which is a metal component is arranged in the coil portion 60, and an eddy current is generated in the housing 20 by electromagnetic induction to generate heat in the housing 20.

加圧装置50は、ハウジング20の外周面において周方向の一部を径方向内側に押圧し、貫通孔21の内周面21aの一部を被嵌合部12の外周面12aに圧接させるための装置である。
本実施形態の加圧装置50は、回転軸51を有する図示しない電動モータと、回転軸51に連結するL字状のL字アーム52と、L字アーム52に回転自在に取り付けられた加圧ローラ53と、を備える。
また、回転軸51の回転軸O1から加圧ローラ53の内側面までの距離L2は、ハウジング20の外径よりも小さく設定されている。よって、回転軸51をラックカバー10と同軸上に配置し、加圧ローラ53をハウジング20の外周面に当接させるように配置すると、L字アーム52の弾性変形力により加圧ローラ53がハウジング20の外周面を径方向内側に押圧する。なお、回転軸51の回転により加圧ローラ53が押圧する部位を変えることができる。
The pressurizing device 50 presses a part of the outer peripheral surface of the housing 20 in the circumferential direction inward in the radial direction, and presses a part of the inner peripheral surface 21a of the through hole 21 against the outer peripheral surface 12a of the fitted portion 12. It is a device of.
The pressurizing device 50 of the present embodiment includes an electric motor (not shown) having a rotating shaft 51, an L-shaped L-shaped arm 52 connected to the rotating shaft 51, and a pressurizing device rotatably attached to the L-shaped arm 52. A roller 53 and a roller 53 are provided.
Further, the distance L2 from the rotating shaft O1 of the rotating shaft 51 to the inner surface of the pressure roller 53 is set to be smaller than the outer diameter of the housing 20. Therefore, when the rotating shaft 51 is arranged coaxially with the rack cover 10 and the pressure roller 53 is arranged so as to be in contact with the outer peripheral surface of the housing 20, the pressure roller 53 is housed by the elastic deformation force of the L-shaped arm 52. The outer peripheral surface of 20 is pressed inward in the radial direction. The portion pressed by the pressurizing roller 53 can be changed by the rotation of the rotating shaft 51.

そして、高周波誘導装置及び加圧装置50を用いた溶着工程は、最初にラックカバー10を固定用治具40に取り付け、ラックカバー10の固定を行う。
次に、加圧装置50の電動モータの回転軸51をラックカバー10と同軸上に配置するとともに、L字アーム52を撓ませながら加圧ローラ53をハウジング20の外周面に当接させる。なお、本実施形態においては、加圧ローラ53は、ハウジング20の外周面のうち上側に位置する上部20bに当接し、その上部20bを径方向内側(下側)に押圧している(図7の矢印参照)。
次に、高周波誘導装置のコイル部60内にハウジング20を配置して起動させる。これにより、ハウジング20は電磁誘導により発熱する。なお、発熱する部位は、ハウジング20の一部でなく全周である。
これによれば、発熱するハウジング20を押し付けられた被嵌合部12の上面12bが溶融する。次に、回転軸51を回転させて加圧ローラ53が押圧する部位を変更すると、溶融した被嵌合部12の上面12bの樹脂が凝固し、ハウジング20の内周側の上部21bbと被嵌合部12の上面12bとが溶着する。
Then, in the welding process using the high-frequency induction device and the pressurizing device 50, the rack cover 10 is first attached to the fixing jig 40, and the rack cover 10 is fixed.
Next, the rotating shaft 51 of the electric motor of the pressurizing device 50 is arranged coaxially with the rack cover 10, and the pressurizing roller 53 is brought into contact with the outer peripheral surface of the housing 20 while bending the L-shaped arm 52. In the present embodiment, the pressure roller 53 abuts on the upper portion 20b located on the upper side of the outer peripheral surface of the housing 20 and presses the upper portion 20b in the radial direction (lower side) (FIG. 7). See the arrow).
Next, the housing 20 is arranged and activated in the coil portion 60 of the high frequency induction device. As a result, the housing 20 generates heat due to electromagnetic induction. The portion that generates heat is not a part of the housing 20 but the entire circumference.
According to this, the upper surface 12b of the fitted portion 12 against which the heat-generating housing 20 is pressed is melted. Next, when the rotating shaft 51 is rotated to change the portion pressed by the pressurizing roller 53, the resin on the upper surface 12b of the melted fitted portion 12 solidifies and is fitted with the upper portion 21bb on the inner peripheral side of the housing 20. The upper surface 12b of the joint portion 12 is welded.

そして、ハウジング20の外周面に対して加圧ローラ53が当接する位置を周方向に移動させ、被嵌合部12と貫通孔(嵌合部)21の内周面21aとの全周を溶着させ、被嵌合部12と貫通孔(嵌合部)21との全周が溶着したら外装部品9が完成する。 Then, the position where the pressure roller 53 comes into contact with the outer peripheral surface of the housing 20 is moved in the circumferential direction, and the entire circumference of the fitted portion 12 and the inner peripheral surface 21a of the through hole (fitting portion) 21 is welded. Then, when the entire circumference of the fitted portion 12 and the through hole (fitting portion) 21 is welded, the exterior component 9 is completed.

なお、本発明において、高周波誘導装置により加熱されるハウジング20の金属材料は、電磁誘導により加熱できれば特に限定されない。 In the present invention, the metal material of the housing 20 heated by the high frequency induction device is not particularly limited as long as it can be heated by electromagnetic induction.

以上、溶着工程の変形例を説明したが、上記外装部品9の製造方法において、準備工程後であって嵌合工程前に粗面化処理工程を行ってもよい。
粗面化処理工程は、金属部品側の嵌合面(ハウジング20の内周面21a)に微細な凹凸に形成する工程である。当該工程によれば、溶着工程で溶融した樹脂が微細な凹凸内に入り込んで固着強度が向上する。
嵌合面に微細な凹凸に形成する方法としては、ハウジング20の内周面21aにエッチング処理又はレーザー加工を行う方法が挙げられる。このエッチング処理又はレーザー加工によれば、内周面21aが削られ(微細な凹部が形成され)、内周面全体が微細な凹凸となる。
Although the modification of the welding step has been described above, in the method for manufacturing the exterior component 9, the roughening treatment step may be performed after the preparation step and before the fitting step.
The roughening treatment step is a step of forming fine irregularities on the fitting surface (inner peripheral surface 21a of the housing 20) on the metal component side. According to this step, the resin melted in the welding step enters into the fine irregularities and the fixing strength is improved.
Examples of the method of forming fine irregularities on the fitting surface include a method of etching or laser processing the inner peripheral surface 21a of the housing 20. By this etching treatment or laser processing, the inner peripheral surface 21a is scraped (fine recesses are formed), and the entire inner peripheral surface becomes fine unevenness.

なお、上記方法により内周面に凹部を形成すると、溶着工程で凹部内から空気が抜け出し難く、溶融した樹脂が凹部に流入しない又は流入する量が少なくなるおそれ(エア噛みのおそれ)がある。よって、粗面化処理工程を実施する場合には、溶着工程において摩擦熱溶着装置(超音波溶着装置、振動溶着装置)を用いて溶着することが好ましい。この摩擦熱溶着装置によれば、ハウジング20が振動して凹部内から空気が抜け出し易くなり、エア噛みのおそれを低減できる。 If the concave portion is formed on the inner peripheral surface by the above method, it is difficult for air to escape from the concave portion in the welding process, and the molten resin may not flow into the concave portion or the amount of the molten resin may decrease (there is a risk of air biting). Therefore, when the roughening treatment step is carried out, it is preferable to perform welding using a frictional heat welding device (ultrasonic welding device, vibration welding device) in the welding step. According to this frictional heat welding device, the housing 20 vibrates and air easily escapes from the recess, so that the risk of air biting can be reduced.

(実施例)
つぎに、実施例について説明する。
実施例では、隅部13及び角部23の曲率半径rが2mm、3mm、4mm、8mm、15mmに形成された外装部品を用意し、各外装部品に対して左右方向(嵌合)に圧縮する荷重をかけ、隅部13に作用する最大応力値を測定した。
また、比較例として、隅部13及び角部23が直角に形成され、R形状となっていない外装部品(曲率半径rが0mm)を用意し、外装部品に対して左右方向(嵌合)に圧縮する荷重をかけ、隅部に作用する最大応力値を測定した。
なお、実施例及び比較例における各外装部品は、曲率半径以外の構成は、第1実施形態で説明した外装部品と同一である。つまり、ラックカバー10の肉厚L1は6mmであり、左端面11における径方向の長さHは4mmであり、被嵌合部12が貫通孔(嵌合部)21に単に内嵌することでラックカバー10と左右のハウジング20,20とが接合している。
また、測定された最大応力値について図8に示す。なお、図8における横軸は、曲率半径rを左端面11の径方向の長さで除算した値となっている。
(Example)
Next, an embodiment will be described.
In the embodiment, exterior parts formed so that the radius of curvature r of the corner portion 13 and the corner portion 23 is 2 mm, 3 mm, 4 mm, 8 mm, and 15 mm are prepared, and each exterior part is compressed in the left-right direction (fitting). A load was applied and the maximum stress value acting on the corner 13 was measured.
Further, as a comparative example, an exterior part (with a radius of curvature r of 0 mm) in which the corners 13 and the corners 23 are formed at right angles and are not R-shaped is prepared, and the exterior parts are fitted in the left-right direction (fitting). A compressive load was applied and the maximum stress value acting on the corner was measured.
Each of the exterior parts in the examples and the comparative examples has the same configuration as the exterior parts described in the first embodiment except for the radius of curvature. That is, the wall thickness L1 of the rack cover 10 is 6 mm, the radial length H of the left end surface 11 is 4 mm, and the fitted portion 12 is simply fitted in the through hole (fitting portion) 21. The rack cover 10 and the left and right housings 20 and 20 are joined.
Further, the measured maximum stress value is shown in FIG. The horizontal axis in FIG. 8 is a value obtained by dividing the radius of curvature r by the radial length of the left end surface 11.

図8に示すように、比較例(曲率半径rが0mmの外装部品)よりも実施例(曲率半径rが2mm、3mm、4mm、15mmの外装部品)の方が小さい最大応力値を示した。
よって、隅部13及び角部23をR形状とすることで、隅部13及び角部23に発生する応力の集中を抑制できることがわかった。
As shown in FIG. 8, the maximum stress value was smaller in the examples (exterior parts having a radius of curvature r of 2 mm, 3 mm, 4 mm, and 15 mm) than in the comparative example (exterior parts having a radius of curvature r of 0 mm).
Therefore, it was found that the concentration of stress generated in the corner portion 13 and the corner portion 23 can be suppressed by forming the corner portion 13 and the corner portion 23 in an R shape.

また、実施例において、曲率半径rが4mm以上になると、大きく最大応力値が減少した。つまり、左端面11の全部が円弧状となると、隅部13に発生する応力の集中を適切に分散できることがわかった。
一方で、曲率半径rが8mmを超えると、最大応力値が上昇した。これは、曲率半径rが大きすぎると、隅部13の径方向外寄りに応力が集中し、隅部13の径方向全域に適切に分散しなかったためと考える。
Further, in the example, when the radius of curvature r was 4 mm or more, the maximum stress value was greatly reduced. That is, it was found that when the entire left end surface 11 has an arc shape, the concentration of stress generated in the corner portion 13 can be appropriately dispersed.
On the other hand, when the radius of curvature r exceeds 8 mm, the maximum stress value increases. It is considered that this is because if the radius of curvature r is too large, the stress is concentrated outward in the radial direction of the corner portion 13 and is not properly dispersed over the entire radial direction of the corner portion 13.

以上から、R形状の曲率半径rは、左端面11の径方向の長さHとの関係で下記式(1)を満たすことが好ましいことが判った。
1≦(r/H)≦2・・・・・式(1)
r:曲率半径[mm]
H:端面の径方向の長さ[mm]
From the above, it was found that the radius of curvature r of the R shape preferably satisfies the following equation (1) in relation to the radial length H of the left end surface 11.
1 ≤ (r / H) ≤ 2 ... Equation (1)
r: Radius of curvature [mm]
H: Length of the end face in the radial direction [mm]

1 操舵装置
6 ラック軸
6a ラック
9,9A,9B 外装部品
10,10A,10B ラックカバー(樹脂部品)
11,11A,11B 左端面(端面)
12,12A,12B 被嵌合部
13,13A,13B 隅部
20,20A,20B ハウジング(金属部品)
21,21B 貫通孔(嵌合部)
22,22B 突き当て面
23,23A,23B 角部
30 ホーン
40 固定用治具
50 加圧装置
51 回転軸
60 コイル部
110 ラックカバー(樹脂部品)
111 嵌合部
112 突き当て面
113 角部
120 ハウジング(金属部品)
121 右端面(端面)
122 被嵌合部
123 隅部
1 Steering device 6 Rack shaft 6a Rack 9,9A, 9B Exterior parts 10,10A, 10B Rack cover (resin parts)
11, 11A, 11B Left end face (end face)
12, 12A, 12B Fitted parts 13, 13A, 13B Corner parts 20, 20A, 20B Housing (metal parts)
21,21B through hole (fitting part)
22,22B Abutting surface 23,23A, 23B Corner part 30 Horn 40 Fixing jig 50 Pressurizing device 51 Rotating shaft 60 Coil part 110 Rack cover (resin part)
111 Fitting part 112 Abutting surface 113 Square part 120 Housing (metal parts)
121 Right end face (end face)
122 Fitted part 123 Corner

Claims (5)

筒状の樹脂部品と筒状の金属部品とを接合して成り、車両の車輪の転舵を行う転舵軸を収容する外装部品であって、
前記樹脂部品及び前記金属部品のうち一方の部品には、端面から突出する被嵌合部が形成され、
前記樹脂部品及び前記金属部品のうち他方の部品には、前記被嵌合部に嵌合する嵌合部及び前記端面に突き当たる突き当て面が形成され、
前記端面と前記被嵌合部とで構成される隅部、及びに前記突き当て面と前記嵌合部とで構成される角部は、R形状となっていることを特徴とする外装部品。
It is an exterior part that is made by joining a tubular resin part and a tubular metal part and accommodates a steering shaft that steers the wheels of a vehicle.
One of the resin part and the metal part is formed with a fitted portion protruding from the end face.
The resin part and the other part of the metal part are formed with a fitting portion to be fitted to the fitting portion and an abutting surface to be abutted against the end face.
An exterior component characterized in that a corner portion composed of the end surface and the fitted portion and a corner portion composed of the abutting surface and the fitting portion have an R shape.
前記R形状における曲率半径は、下記式(1)を満たすことを特徴とする請求項1に記載の外装部品。

1≦(r/H)≦2・・・・・式(1)
r:曲率半径[mm]
H:端面の径方向の長さ[mm]
The exterior component according to claim 1, wherein the radius of curvature in the R shape satisfies the following formula (1).

1 ≤ (r / H) ≤ 2 ... Equation (1)
r: Radius of curvature [mm]
H: Length of the end face in the radial direction [mm]
筒状の樹脂部品と筒状の金属部品とを接合して成り、車両の車輪の転舵を行う転舵軸を収容する外装部品の製造方法であって、
前記樹脂部品及び前記金属部品のうち一方の部品には、端面から突出する被嵌合部が形成され、前記樹脂部品及び前記金属部品のうち他方の部品には、前記被嵌合部に嵌合する嵌合部及び前記端面に突き当たる突き当て面が形成され、前記端面と前記被嵌合部とで構成される隅部、及びに前記突き当て面と前記嵌合部とで構成される角部がR形状となっており、
熱可塑性樹脂製の前記樹脂部品及び前記金属部品を準備する準備工程と、
前記被嵌合部に嵌合部を嵌合する嵌合工程と、
前記被嵌合部と前記嵌合部を嵌合した状態で、外的加熱装置により前記被嵌合部又は前記嵌合部に加圧力を加えながら前記樹脂部品に形成された前記被嵌合部又は前記嵌合部を溶融させ、前記被嵌合部と前記嵌合部とを溶着する溶着工程と、
を含むことを特徴とする外装部品の製造方法。
It is a method of manufacturing an exterior part that is made by joining a tubular resin part and a tubular metal part and accommodates a steering shaft that steers the wheels of a vehicle.
One of the resin part and the metal part is formed with a fitted portion protruding from the end face, and the other part of the resin part and the metal part is fitted to the fitted portion. A fitting portion to be fitted and an abutting surface abutting against the end face are formed, and a corner portion formed by the end face and the fitted portion, and a corner portion formed by the abutting surface and the fitting portion. Is R-shaped,
Preparatory steps for preparing the resin parts and the metal parts made of thermoplastic resin,
The fitting step of fitting the fitting portion to the fitting portion, and
With the fitted portion and the fitted portion fitted, the fitted portion formed on the resin component while applying pressure to the fitted portion or the fitting portion by an external heating device. Alternatively, a welding step of melting the fitting portion and welding the fitting portion and the fitting portion,
A method of manufacturing an exterior part, which comprises.
前記準備工程後であって前記嵌合工程前において、前記金属部品に形成された前記被嵌合部又は前記嵌合部に粗面化処理を行う粗面化処理工程を含むことを特徴とする請求項3の外装部品の製造方法。 It is characterized by including a roughening treatment step of performing a roughening treatment on the fitted portion or the fitting portion formed on the metal part after the preparation step and before the fitting step. The method for manufacturing an exterior part according to claim 3. 筒状の樹脂部品と筒状の金属部品とを接合して成り、車両の車輪の転舵を行う転舵軸を収容する外装部品の製造方法であって、
前記樹脂部品及び前記金属部品のうち一方の部品には、端面から突出する被嵌合部が形成され、前記樹脂部品及び前記金属部品のうち他方の部品には、前記被嵌合部に嵌合する嵌合部及び前記端面に突き当たる突き当て面が形成され、前記端面と前記被嵌合部とで構成される隅部、及びに前記突き当て面と前記嵌合部とで構成される角部がR形状となっており、
前記金属部品を準備する準備工程と、
前記金属部品を金型内に配置する配置する配置工程と、
前記金型内に樹脂を射出して前記樹脂部品を成形するインサート成形工程と、
を含むことを特徴とする外装部品の製造方法。
It is a method of manufacturing an exterior part that is made by joining a tubular resin part and a tubular metal part and accommodates a steering shaft that steers the wheels of a vehicle.
One of the resin part and the metal part is formed with a fitted portion protruding from the end face, and the other part of the resin part and the metal part is fitted to the fitted portion. A fitting portion to be fitted and an abutting surface abutting against the end face are formed, and a corner portion formed by the end face and the fitted portion, and a corner portion formed by the abutting surface and the fitting portion. Is R-shaped,
The preparatory process for preparing the metal parts and
The arrangement process of arranging the metal parts in the mold and
An insert molding process of injecting resin into the mold to mold the resin parts, and
A method of manufacturing an exterior part, which comprises.
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US20030167619A1 (en) 2000-07-04 2003-09-11 Friedhelm Gunther Production method, device and steering rod guiding element for gear rack steering housing
JP2004216425A (en) 2003-01-15 2004-08-05 Taisei Plas Co Ltd Connection joint of aluminum alloy pipe and method of manufacturing the same
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JP2012240563A (en) 2011-05-20 2012-12-10 Nsk Ltd Steering system
JP2014136437A (en) 2013-01-15 2014-07-28 Jtekt Corp Rack pinion type steering device
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JP2016159879A (en) 2015-03-05 2016-09-05 株式会社ジェイテクト Steering device
JP2017222361A (en) 2017-09-19 2017-12-21 株式会社ショーワ Steering device

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Publication number Priority date Publication date Assignee Title
US20030167619A1 (en) 2000-07-04 2003-09-11 Friedhelm Gunther Production method, device and steering rod guiding element for gear rack steering housing
JP2004216425A (en) 2003-01-15 2004-08-05 Taisei Plas Co Ltd Connection joint of aluminum alloy pipe and method of manufacturing the same
US20080028592A1 (en) 2005-09-30 2008-02-07 Stieler David C Method of coupling plastic components to metal tubing
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