JP2013018317A - Structure of vehicle parts - Google Patents

Structure of vehicle parts Download PDF

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Publication number
JP2013018317A
JP2013018317A JP2011151227A JP2011151227A JP2013018317A JP 2013018317 A JP2013018317 A JP 2013018317A JP 2011151227 A JP2011151227 A JP 2011151227A JP 2011151227 A JP2011151227 A JP 2011151227A JP 2013018317 A JP2013018317 A JP 2013018317A
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Japan
Prior art keywords
intermediate member
cast
torsion beam
die
trailing arm
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JP2011151227A
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Japanese (ja)
Inventor
Masaharu Matsumoto
正春 松本
Teihiro Sekine
禎浩 関根
Shunzo Aoyama
俊三 青山
Yasushi Sugano
靖 菅野
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Ahresty Corp
Yorozu Corp
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Ahresty Corp
Yorozu Corp
Yorozu Jidosha Kogyo KK
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Application filed by Ahresty Corp, Yorozu Corp, Yorozu Jidosha Kogyo KK filed Critical Ahresty Corp
Priority to JP2011151227A priority Critical patent/JP2013018317A/en
Priority to PCT/JP2012/067379 priority patent/WO2013005846A1/en
Publication of JP2013018317A publication Critical patent/JP2013018317A/en
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/02—Casting in, on, or around objects which form part of the product for making reinforced articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/04—Casting in, on, or around objects which form part of the product for joining parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/02—Seam welding; Backing means; Inserts
    • B23K9/028—Seam welding; Backing means; Inserts for curved planar seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G21/00—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces
    • B60G21/02—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected
    • B60G21/04—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected mechanically
    • B60G21/05—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected mechanically between wheels on the same axle but on different sides of the vehicle, i.e. the left and right wheel suspensions being interconnected
    • B60G21/051—Trailing arm twist beam axles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
    • B62D21/11—Understructures, i.e. chassis frame on which a vehicle body may be mounted with resilient means for suspension, e.g. of wheels or engine; sub-frames for mounting engine or suspensions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D29/00—Superstructures, understructures, or sub-units thereof, characterised by the material thereof
    • B62D29/008—Superstructures, understructures, or sub-units thereof, characterised by the material thereof predominantly of light alloys, e.g. extruded
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/006—Vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/18—Dissimilar materials
    • B23K2103/20—Ferrous alloys and aluminium or alloys thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/20—Constructional features of semi-rigid axles, e.g. twist beam type axles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/20—Constructional features of semi-rigid axles, e.g. twist beam type axles
    • B60G2206/202—Constructional features of semi-rigid axles, e.g. twist beam type axles with a radially deformed tube as a cross member
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/70—Materials used in suspensions
    • B60G2206/71—Light weight materials
    • B60G2206/7102—Aluminium alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/70—Materials used in suspensions
    • B60G2206/72—Steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/80—Manufacturing procedures
    • B60G2206/81—Shaping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/80—Manufacturing procedures
    • B60G2206/81—Shaping
    • B60G2206/8101—Shaping by casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/80—Manufacturing procedures
    • B60G2206/82—Joining
    • B60G2206/8201—Joining by welding

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Plasma & Fusion (AREA)
  • Physics & Mathematics (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Vehicle Body Suspensions (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Body Structure For Vehicles (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a structure of vehicle parts that reduces weight, and exhibits high bonding power and rigidity even when twisted, pulled, bent or compressed from any directions, while having advantages in manufacturing and cost.SOLUTION: A steel intermediate member 11 is formed between a trailing arm 1 made of aluminium die-cast and a steal torsion beam 2. One end of the intermediate member 11 is welded to the torsion beam 2. The other end 11a is integrally cast-coated when the trailing arm 1 is die-cast molded. The intermediate member 11 is formed so that the one end is brought into internal or external contact with an end of the cylindrical torsion beam 2. A cast coating part 12 includes a linear tube part 11d extended in parallel with an axial line of the intermediate member 11, and a stepped part 11e formed at least at the end 11b of the linear tube part 11d.

Description

本発明は、異種金属を用いて成形する車両用部品の構造に関する。   The present invention relates to the structure of a vehicle component molded using a dissimilar metal.

車両用部品、例えば、トーションビーム式サスペンションは、車両の幅方向に伸延するトーションビームの両端部に、車輪懸架部材を取り付けるトレーリングアームが設けられたものであり、全体的構造が比較的シンプルなことから、主に前輪駆動車に使用されている。   A vehicle component, for example, a torsion beam suspension is provided with a trailing arm for attaching a wheel suspension member at both ends of a torsion beam extending in the width direction of the vehicle, and the overall structure is relatively simple. , Mainly used in front-wheel drive vehicles.

このサスペンションに使用されているトーションビームに対しては、車輪が連結されているトレーリングアームなどを介して捩り力、引張り力、曲げ力あるいは圧縮力などが上下、左右、前後の方向から作用するので、従来から高剛性を有する鋼材により構成されている。しかし、車両の軽量化の要請から、トーションビームをプレス成形した中空の鋼板とし、これにトレーリングアームを溶接接合しているものが用いられるようになっている。   For the torsion beam used in this suspension, the torsional force, tensile force, bending force or compressive force acts on the torsion beam connected to the wheel from the top, bottom, left and right and front and rear directions. Conventionally, it is made of a steel material having high rigidity. However, in order to reduce the weight of a vehicle, a torsion beam is formed by press forming a hollow steel plate, and a trailing arm is welded to the steel plate.

最近では、さらなる軽量化の要請から、トーションビーム及びトレーリングアームをアルミニウム合金により構成し、両者を溶接接合したものも開示されている（下記特許文献１）。しかし、アルミニウム合金の溶接は、面倒でコスト的にも不利なことから、トーションビーム式サスペンションには好ましくない。   Recently, a request for further weight reduction has been disclosed in which the torsion beam and the trailing arm are made of an aluminum alloy and both are welded together (Patent Document 1 below). However, welding of an aluminum alloy is not preferable for a torsion beam type suspension because it is cumbersome and disadvantageous in terms of cost.

また、アルミニウム合金同士の溶接を回避するため、例えば、アルミニウム合金と鋼板とを結合する場合に、つなぎ部品を使用し、つなぎ部品の一端を、いわゆる鋳込み、他端を溶接により連結する構造を有するものもある（下記特許文献２）。この特許文献２に開示されているものは、車両のダンパハウジングをアルミニウム合金、サイドフレームを鋼板により構成し、両者を接合する場合に、鋼板製のつなぎ部品を使用し、つなぎ部品の一端をダンパハウジングの鋳造成形時に一緒に鋳込み、つなぎ部品の他端をサイドフレームに溶接接合し、アルミニウム合金と鋼板という異種金属の結合を容易に行うことができるようにしている。ここで使用されているダンパハウジング、つなぎ部品及びサイドフレームは、全て平板状をしたもので、ダンパハウジングのアルミ鋳造時に、つなぎ部品の鋳込まれる部分は直状板とし、鋳込まれない部分に段差部を設け、湯が段差部により堰き止められ、鋳込まれない部分にまで入り込まないようにし、バリ取り作業の簡素化を図っている。   In order to avoid welding between aluminum alloys, for example, when joining an aluminum alloy and a steel plate, a connecting part is used, and one end of the connecting part is so-called cast and the other end is connected by welding. There is also one (the following patent document 2). In this patent document 2, when a damper housing of a vehicle is made of an aluminum alloy, a side frame is made of a steel plate, and both are joined, a steel plate connecting part is used, and one end of the connecting part is a damper. It is cast together when the housing is cast, and the other end of the joint part is welded and joined to the side frame so that the dissimilar metals aluminum alloy and steel plate can be easily joined. The damper housing, connecting parts, and side frames used here are all flat, and when casting the aluminum of the damper housing, the parts that are to be cast are made into straight plates and the parts that are not cast A step portion is provided so that the hot water is blocked by the step portion and does not enter the portion that is not cast, thereby simplifying the deburring operation.

特開２０１０−６９９６３号公報JP 2010-69963 A 特開２０１０−１９４５８３号公報JP 2010-194583 A

ところが、鋳込まれるつなぎ部品は平板であり、この平板の端部を単に一体的に鋳包んでいるのみであるため、アルミニウム合金製のダンパハウジングとの接合状態は、接合強度的に弱く、ダンパハウジングとつなぎ部品の接合部分に引張り荷重がかかると、ダンパハウジングからつなぎ部品が抜け出るおそれがある。特に、捩り力、引張り力、曲げ力あるいは圧縮力などが上下、左右、前後の方向から作用するサスペンションを、このような鋳込み構造とすることは、強度あるいは剛性の面で好ましくない。   However, since the connecting part to be cast is a flat plate, and the end of the flat plate is simply casted integrally, the bonding state with the aluminum alloy damper housing is weak in terms of bonding strength. If a tensile load is applied to the joint between the housing and the connecting part, the connecting part may come out of the damper housing. In particular, it is not preferable in terms of strength or rigidity that a suspension in which a torsional force, a tensile force, a bending force, or a compressive force acts from the top, bottom, left, and front and back directions has such a cast structure.

本発明は、上記従来技術に伴う課題を解決するためになされたもので、さらなる軽量化を図ると共に、あらゆる方向から作用する種々の力に対しても、接合強度が高く、高剛性で、製造的にもコスト的にも有利な、車両用部品の構造を提供することを目的とする。   The present invention was made in order to solve the problems associated with the above-described conventional technology, and further reduces the weight and has high bonding strength and high rigidity against various forces acting from all directions. Another object of the present invention is to provide a vehicle component structure that is advantageous in terms of cost and cost.

上記目的を達成する本発明に係る車両用部品の構造は、アルミダイキャスト製の第１部品と鋼板製の第２部品との間に、鋼板製の繋ぎ用中間部材を設け、当該中間部材の一端部を前記第１部品のダイキャスト成形時に一体的に鋳包み、他端部を前記第２部品と溶接接合してなる車両用部品において、前記中間部材は、前記他端部が筒状をした前記第２部品の端部と内接若しくは外接するように成形され、前記鋳包み側の一端部が前記中間部材の軸線と並行に伸延する直状管部と、当該直状管部の少なくとも端部に形成された段付き部と、を有するように形成したことを特徴とする。   The structure of the vehicle component according to the present invention that achieves the above object is provided with a steel plate connecting intermediate member between the first die-cast aluminum component and the second steel plate component. In the vehicle component formed by integrally casting one end portion during die casting of the first component and welding the other end portion with the second component, the intermediate member has a cylindrical shape at the other end portion. A straight tube portion that is shaped to be inscribed or circumscribed with the end portion of the second component, the one end portion on the cast-in side extending in parallel with the axis of the intermediate member, and at least of the straight tube portion And a stepped portion formed at the end portion.

請求項１の発明によれば、アルミダイキャスト製の第１部品と鋼板製の第２部品相互間に鋼板製の中間部材を介在させて両部品を繋ぐ場合に、中間部材の他端部は筒状をした前記第２部品の端部と接するように筒状とし、鋳包み側の一端部は軸線と並行に伸延する直状管部と、直状管部の少なくとも端部に形成された段付き部とを有する構成としたので、中間部材は、鋳包み側では第１部品と段付き部を介して連結されることになり、連結強度が高まり、また、第２部品とは筒状部分が連結されることになり、全体的に極めて高強度で高剛性な車両用部品となる。しかも、段付き部の成形は容易であり、アルミニウム合金同士の接合ではないため、製造が容易でコスト的にも有利となる。   According to the invention of claim 1, when connecting the two parts by interposing a steel plate intermediate member between the aluminum die cast first part and the steel plate second part, the other end of the intermediate member is The cylindrical part is in contact with the end of the second part, and one end on the cast-in side is formed at a straight pipe extending in parallel with the axis, and at least the end of the straight pipe Since the intermediate member has a stepped portion, the intermediate member is connected to the first part via the stepped portion on the cast-in side, the connection strength is increased, and the second part is cylindrical. As a result, the parts are connected to each other, so that the overall vehicle component is extremely high in strength and rigidity. In addition, since the stepped portion is easy to form and is not a join between aluminum alloys, it is easy to manufacture and is advantageous in terms of cost.

請求項２の発明によれば、前記中間部材の鋳包み部分の軸直角断面形状を、角部が円弧状とされた多角形状若しくは楕円形状に形成したので、中間部材自体が高強度で高剛性になり、車両用部品全体としての強度も高まる。   According to the invention of claim 2, since the cross-sectional shape perpendicular to the axis of the cast-in part of the intermediate member is formed in a polygonal shape or an elliptical shape with the corners being arcuate, the intermediate member itself has high strength and high rigidity. Thus, the strength of the entire vehicle component is increased.

請求項３の発明によれば、第１部品がトレーリング部材、第２部品がトーションビームのトーションビーム式サスペンションであるため、軽量で、あらゆる方向からの捩り力、引張り力、曲げ力あるいは圧縮力に対して高強度、高剛性で、製造的、コスト的にも有利なサスペンションとなる。   According to the invention of claim 3, since the first part is a trailing member and the second part is a torsion beam suspension of a torsion beam, it is lightweight and is resistant to torsional force, tensile force, bending force or compressive force from all directions. The suspension has high strength and high rigidity, and is advantageous in terms of manufacturing and cost.

本発明の実施形態に係る車両用部品を適用したトーションビーム式サスペンションの概略斜視図である。1 is a schematic perspective view of a torsion beam suspension to which a vehicle component according to an embodiment of the present invention is applied. 同車両用部品の平面図である。It is a top view of the parts for vehicles. トーションビームの端部を示す概略斜視図である。It is a schematic perspective view which shows the edge part of a torsion beam. 図２の４−４線に沿う断面図である。FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 図４の５−５線に沿う断面図である。It is sectional drawing which follows the 5-5 line of FIG.

以下、本発明の実施形態を、図面を参照しつつ説明する。   Embodiments of the present invention will be described below with reference to the drawings.

本実施形態に係る車両用部品は、乗用車のトーションビーム式サスペンションである。このサスペンションは、図１に示すように、左右のトレーリングアーム１が、車体の幅方向に延在するトーションビーム２の各端部に連結されている。   The vehicle component according to the present embodiment is a torsion beam suspension of a passenger car. In this suspension, as shown in FIG. 1, left and right trailing arms 1 are connected to respective end portions of a torsion beam 2 extending in the width direction of the vehicle body.

トレーリングアーム１の基端部３は、トーションビーム２よりも車体の前方位置で車体にブッシュを介して回動可能に連結され、先端部４側においては、外側に車輪が取り付けられるハブ５が設けられ、内側に懸架部６が設けられている。懸架部６は、支持プレート７にコイルスプリング８が設けられ、取付部９にショックアブソーバ１０の一端が取り付けられている。   A base end portion 3 of the trailing arm 1 is rotatably connected to the vehicle body via a bush at a position ahead of the vehicle body relative to the torsion beam 2, and a hub 5 to which a wheel is attached is provided on the distal end portion 4 side. The suspension 6 is provided on the inner side. In the suspension part 6, a coil spring 8 is provided on a support plate 7, and one end of a shock absorber 10 is attached to an attachment part 9.

本実施形態では、トレーリングアーム１（第１部品）はアルミダイキャスト製であり、トーションビーム２（第２部品）は鋼板製で、両者間には、図２に示すように、トレーリングアーム１とトーションビーム２を繋ぐ鋼板製の中間部材１１が設けられている。ここにおいて、鋼板製のトーションビーム２は、トレーリングアーム１と連結される左右端部２ａ及びその近傍が、中間部２ｂより末広がりに拡開され、その断面形状は角部が円弧状とされた四角形の筒状をしている（図５参照）。このようにすれば、トレーリングアーム１との連結強度が高いものが得られることになり、好ましい。なお、左右端部２ａの形状は、必ずしも四角筒形状である必要はなく、高い剛性を有するものであれば楕円筒形状、円筒形状など、どのような形状であってもよい。   In the present embodiment, the trailing arm 1 (first part) is made of aluminum die-casting, the torsion beam 2 (second part) is made of steel plate, and as shown in FIG. An intermediate member 11 made of a steel plate that connects the torsion beam 2 is provided. Here, the torsion beam 2 made of a steel plate is a quadrangle in which the left and right end portions 2a connected to the trailing arm 1 and the vicinity thereof are expanded wider than the intermediate portion 2b, and the cross-sectional shape is an arc shape in the corner portion. (See FIG. 5). In this way, a high connection strength with the trailing arm 1 is obtained, which is preferable. In addition, the shape of the left and right end portions 2a is not necessarily a square tube shape, and may be any shape such as an elliptical cylinder shape or a cylindrical shape as long as it has high rigidity.

トーションビーム２の中間部２ｂは、図３に示すように、前方向かって開放された開断面形状となるように構成されている。このようにすれば、上下方向から水滴が入り込むことがなく、捩じり力にも対応でき、全体的に軽量なものとなる。なお、この中間部２ｂの断面形状は、必ずしも前方向かって開放された開断面形状である必要はなく、後方、上方あるいは下方に向かって開放された開断面形状であってもよい。   As shown in FIG. 3, the intermediate portion 2 b of the torsion beam 2 is configured to have an open cross-sectional shape opened toward the front. In this way, water droplets do not enter from the top and bottom directions, can cope with torsional forces, and the overall weight is reduced. Note that the cross-sectional shape of the intermediate portion 2b is not necessarily an open cross-sectional shape opened toward the front, and may be an open cross-sectional shape opened toward the rear, upward, or downward.

中間部材１１は、図４に示すように、一端部１１ａがトーションビーム２の端部に接するように設けられ、トーションビーム２と溶接接合されている。   As shown in FIG. 4, the intermediate member 11 is provided such that one end 11 a is in contact with the end of the torsion beam 2, and is welded to the torsion beam 2.

つまり、中間部材１１のトーションビーム２側の端部１１ａは、図５に示すように、トーションビーム２の端部２ａの断面形状と同様の、軸直角断面形状が、角部を円弧状に形成された四角形状とされている。このようにすれば、トーションビーム２の左右端部２ａの断面係数が増大し、トーションビーム２と全周的に溶接され、強度的に優れたものとなる。また、中間部材１１とトーションビーム２とは、共に鋼板製であるため、問題なく簡単に溶接接合でき、コスト的にも有利となる。   That is, the end portion 11a on the torsion beam 2 side of the intermediate member 11 has a cross-sectional shape perpendicular to the axis similar to the cross-sectional shape of the end portion 2a of the torsion beam 2, and the corner portion is formed in an arc shape as shown in FIG. It is a square shape. By doing so, the section modulus of the left and right end portions 2a of the torsion beam 2 is increased, and the torsion beam 2 is welded to the entire circumference, and the strength is excellent. Further, since the intermediate member 11 and the torsion beam 2 are both made of steel plates, they can be easily welded together without any problem, which is advantageous in terms of cost.

一方、中間部材１１の他端部１１ｂは、トレーリングアーム１のダイキャスト成形時に一体的に鋳包まれることになる。この鋳包まれる部分を鋳包み部１２と称す。   On the other hand, the other end portion 11 b of the intermediate member 11 is integrally cast when the trailing arm 1 is die-cast. This portion to be cast is referred to as a cast-in portion 12.

特に、本実施形態の中間部材１１は、鋳包み部１２が、中間部材１１の軸線と並行に伸延する直状管部１１ｄと、直状管部１１ｄの一端部に形成された段付き部１１ｅと、を有するように形成されている。このようにすれば、トレーリングアーム１のダイキャスト成形時に中間部材１１の鋳包み部１２を鋳包むと、ダイキャスト部分は段付き部１１ｅと凹凸嵌合した状態になるので、ダイキャスト部分と中間部材１１との連結強度が高まり、あらゆる方向からの捩り力、引張り力、曲げ力あるいは圧縮力に対しても接合強度が高く、中間部材１１がダイキャスト部分から抜け出るおそれはなく、極めて高強度で高剛性なものとなる。しかも、本実施形態の段付き部１１ｅは、放射方向外方に向けて拡がるように形成しているので、より接合強度が高いものとなる。さらに、本実施形態の中間部材１１は、一方の端部に段付き部１１ｅが形成され、他方の端部まで軸線に沿って直状に伸延する筒状体であり、段付き部１１ｅの成形も容易であるため、全体形状がシンプルで、鋳込み作業時のセットも容易となり、製造作業性の点でも製造コスト的にも有利となる。   In particular, in the intermediate member 11 of the present embodiment, the cast-in portion 12 has a straight tube portion 11d extending in parallel with the axis of the intermediate member 11, and a stepped portion 11e formed at one end of the straight tube portion 11d. And so as to have. In this way, when the casting portion 12 of the intermediate member 11 is cast at the time of die-casting the trailing arm 1, the die-cast portion is in an unevenly fitted state with the stepped portion 11e. The connection strength with the intermediate member 11 is increased, the bonding strength is high with respect to torsional force, tensile force, bending force or compression force from any direction, and the intermediate member 11 is not likely to come out of the die-cast portion, and has extremely high strength. With high rigidity. In addition, since the stepped portion 11e of the present embodiment is formed so as to expand outward in the radial direction, the bonding strength is higher. Furthermore, the intermediate member 11 of the present embodiment is a cylindrical body in which a stepped portion 11e is formed at one end and extends straight along the axis to the other end, and the stepped portion 11e is formed. Therefore, the overall shape is simple, the setting during casting is easy, and this is advantageous in terms of manufacturing workability and manufacturing cost.

本実施形態の段付き部１１ｅは、外方に向けて拡がるものであるが、本発明は、これのみでなく、中間部材１１が、ダイキャスト成形部分から抜けないような形状であればどのような形状であってもよく、放射方向内方に向かって変形させてもよく、また、ジグザク状などに変形させることにより形成してもよい。また、端部１１ａは、トーションビーム２に外接状態でなく、内接状態としてもよい。   The stepped portion 11e of the present embodiment expands outward. However, the present invention is not limited to this, and the intermediate member 11 may have any shape that does not come out of the die cast part. It may be any shape, may be deformed inward in the radial direction, or may be formed by being deformed in a zigzag shape or the like. Further, the end portion 11a may be in an inscribed state instead of circumscribing the torsion beam 2.

中間部材１１は、直状管部１１ｄに通孔１３を形成してもよい。通孔１３を直状管部１１ｄに形成すれば、鋳込み成形時に通孔１３を通って湯が流れ、これが固化すると、ダイキャスト部分と中間部材１１とは、通孔１３内で固化したアルミニウム合金によって連結されることになる。この結果、直角断面形状が、角部を円弧状に形成された四角形状あるいは楕円状の中間部材１１に対し曲げ荷重などが作用する場合には、中間部材１１の放射方向外方を被覆する部分（アルミ表皮部分）が中間部材１１に追従して変形することになり、アルミ表皮部分の中間部材１１に対する追従性が向上し、アルミ表皮部分の剥離が防止される。なお、通孔１３は、１つのみでなく、図５に示すように、複数個形成すれば、固化したアルミニウム合金による連結部分が複数になり、剥離の防止効果などが一層高まる。また、通孔１３は、直状管部１１ｄのみでなく、段付き部１１ｅに形成してもよい。   The intermediate member 11 may form a through hole 13 in the straight tube portion 11d. If the through-hole 13 is formed in the straight pipe portion 11d, hot water flows through the through-hole 13 during casting, and when this solidifies, the die-cast portion and the intermediate member 11 are solidified in the through-hole 13 aluminum alloy. Will be linked. As a result, when a bending load or the like is applied to the rectangular or elliptical intermediate member 11 whose corner is formed in an arc shape, the right-angle cross-sectional shape is a portion that covers the outer side of the intermediate member 11 in the radial direction. The (aluminum skin part) is deformed following the intermediate member 11, the followability of the aluminum skin part to the intermediate member 11 is improved, and peeling of the aluminum skin part is prevented. If a plurality of through holes 13 are formed as shown in FIG. 5 as shown in FIG. 5, there will be a plurality of connecting portions made of solidified aluminum alloy, and the effect of preventing peeling will be further enhanced. Further, the through hole 13 may be formed not only in the straight tube portion 11d but also in the stepped portion 11e.

次に作用を説明する。   Next, the operation will be described.

上記構成に係る車両用部品を形成するに当たっては、まず、トレーリングアーム１を鋳造により成形する。この鋳造に当たっては、高真空ダイカスト法などを使用する必要はなく、通常のダイカスト法でよい。高真空ダイカスト法を用いると、鋳造後の製品に含まれるガスが低減し、後に溶接する場合に、溶接不良が低減するというメリットがあるが、本実施形態では、トレーリングアーム１とトーションビーム２とは直接接合しないので、コスト的に不利な高真空ダイカスト法を用いる必要はない。   In forming the vehicle component according to the above configuration, first, the trailing arm 1 is formed by casting. In casting, it is not necessary to use a high vacuum die casting method or the like, and a normal die casting method may be used. When the high vacuum die casting method is used, the gas contained in the product after casting is reduced, and there is a merit that defective welding is reduced when welding later, but in this embodiment, the trailing arm 1 and the torsion beam 2 Is not directly bonded, so there is no need to use a high vacuum die casting method, which is disadvantageous in terms of cost.

ダイカスト鋳造を行う場合、型内に中間部材１１の鋳包み部１２をセットし、トレーリングアーム１の成形時に中間部材１１の鋳包み部１２を鋳包む。   When performing die-casting, the cast-in part 12 of the intermediate member 11 is set in the mold, and the cast-in part 12 of the intermediate member 11 is cast when the trailing arm 1 is formed.

この鋳包み時に、アルミニウム合金からなる湯は、段付き部１１ｅを有する鋳包み部１２の周囲を包むように流れると共に、中間部材１１に開設された通孔１３を通って流れる。そして、これが固化すると、ダイキャスト部分と中間部材１１とは、通孔１３内で固化したアルミニウム合金によって連結される。この結果、軸直角断面形状が角部を円弧状とした多角形状または楕円形状となっている中間部材１１に対し、引張り方向、つまり中間部材１１がダイキャスト成形部分からぬける方向の力、あるいは回転方向（ねじり方向）などの力が作用しても、ダイキャスト成形部分と段付き部１１ｅとの係合状態や通孔１３内で固化したアルミニウム合金がこれに対抗することになる。これにより、中間部材１１の放射方向外方を被覆する部分（アルミ表皮部分）が中間部材１１に追従して変形することになり、アルミ表皮部分の中間部材１１に対する追従性が向上し、アルミ表皮部分の剥離が防止される。   At the time of casting, hot water made of an aluminum alloy flows so as to wrap around the cast-in part 12 having the stepped part 11e, and also flows through the through-hole 13 provided in the intermediate member 11. And when this solidifies, the die-cast part and the intermediate member 11 are connected by the aluminum alloy solidified in the through-hole 13. As a result, the force in the pulling direction, that is, the direction in which the intermediate member 11 is removed from the die-cast molding part, or the rotation, with respect to the intermediate member 11 whose cross-sectional shape perpendicular to the axis is a polygonal shape or an elliptical shape with arcs at the corners. Even if a force such as a direction (twisting direction) is applied, the state of engagement between the die-cast molded portion and the stepped portion 11e and the aluminum alloy solidified in the through-hole 13 counteract this. Thereby, the part (aluminum skin part) which coat | covers the radial direction outer side of the intermediate member 11 will deform | transform following the intermediate member 11, the followability with respect to the intermediate member 11 of an aluminum skin part will improve, and an aluminum skin Part peeling is prevented.

次に、予めプレス成形あるいは液圧成形などにより形成されたトーションビーム２の端部２ａを中間部材１１の端部１１ａに挿入し、溶接により両者を接合する。この中間部材１１は、鋼板製であり、トーションビーム２も鋼板製であるため、両者の接合は問題なく行うことができる。   Next, the end 2a of the torsion beam 2 formed in advance by press molding or hydraulic molding is inserted into the end 11a of the intermediate member 11, and both are joined by welding. Since the intermediate member 11 is made of a steel plate and the torsion beam 2 is also made of a steel plate, the joining can be performed without any problem.

このように、本実施形態では、面倒なアルミニウム合金同士の溶接作業や、異種金属同士の溶接作業を行うことなく、異種金属のトレーリングアーム１とトーションビーム２を簡単に連結することができる。   Thus, in this embodiment, the dissimilar metal trailing arm 1 and the torsion beam 2 can be easily connected without performing troublesome welding operations between aluminum alloys or dissimilar metals.

本発明は、上述した実施形態のみに限定されるものではなく、本発明の技術的思想内において当業者により種々変更が可能である。例えば、上述した実施形態は、車両のトーションビーム式サスペンションについて説明したが、本発明は、これのみに限定されるものではなく、フロントまたはリアサブフレームなど異種金属を使用する種々の車両用部品に同様に実施可能である。   The present invention is not limited to the above-described embodiments, and various modifications can be made by those skilled in the art within the technical idea of the present invention. For example, although the above-described embodiment has been described with respect to a torsion beam suspension of a vehicle, the present invention is not limited to this, and is similar to various vehicle parts using dissimilar metals such as a front or rear subframe. Can be implemented.

本発明は、軽量で変形しにくく、製造が容易でコスト的にも有利な、強度的に信頼性の高い異種金属材料からなるトーションビーム式サスペンションに好適に利用できる。   INDUSTRIAL APPLICABILITY The present invention can be suitably used for a torsion beam type suspension made of a dissimilar metal material having high strength and reliability, which is lightweight, hardly deformed, easy to manufacture and advantageous in terms of cost.

１…トレーリングアーム（第１部品）、
２…トーションビーム（第２部品）、
２ａ…トーションビームの端部、
２ｂ…トーションビームの中間部、
１１…中間部材、
１１ｄ…直状管部、
１１ｅ…段付き部、
１２…鋳包み部。 1 ... trailing arm (first part),
2 ... Torsion beam (second part),
2a ... the end of the torsion beam,
2b ... the middle part of the torsion beam,
11 ... Intermediate member,
11d ... straight pipe part,
11e ... Stepped part,
12: Cast-in part.

Claims (3)

アルミダイキャスト製の第１部品と鋼板製の第２部品との間に、鋼板製の繋ぎ用中間部材を設け、当該中間部材の一端部を前記第１部品のダイキャスト成形時に一体的に鋳包み、他端部を前記第２部品と溶接接合してなる車両用部品において、前記中間部材は、前記他端部が筒状をした前記第２部品の端部と内接若しくは外接するように成形され、前記鋳包み側の一端部が前記中間部材の軸線と並行に伸延する直状管部と、当該直状管部の少なくとも端部に形成された段付き部と、を有するように形成したことを特徴とする車両用部品の構造。   An intermediate member made of steel plate is provided between the first part made of aluminum die cast and the second part made of steel plate, and one end of the intermediate member is integrally cast at the time of die casting of the first part. In a vehicle part formed by wrapping and welding the other end part to the second part, the intermediate member is inscribed or circumscribed with an end part of the second part having the other end part in a cylindrical shape. Formed so that one end on the cast-in side has a straight tube portion extending in parallel with the axis of the intermediate member, and a stepped portion formed at least at the end of the straight tube portion The structure of the vehicle parts characterized by the above. 前記中間部材の鋳包み部は、軸直角断面形状が、角部が円弧状とされた多角形状若しくは楕円形状に形成したことを特徴とする請求項１に記載の車両用部品の構造。   2. The structure of a vehicle component according to claim 1, wherein the cast-in part of the intermediate member is formed in a polygonal shape or an elliptical shape in which a cross section perpendicular to the axis has an arc shape at a corner. 前記車両用部品は、前記第１部品がトレーリングアーム、第２部品がトーションビームとされたトーションビーム式サスペンションである請求項１又は２に記載の車両用部品の構造。   The structure of a vehicle component according to claim 1 or 2, wherein the vehicle component is a torsion beam type suspension in which the first component is a trailing arm and the second component is a torsion beam.
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