JP5723422B2 - Sheet metal axle case - Google Patents

Sheet metal axle case Download PDF

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JP5723422B2
JP5723422B2 JP2013160049A JP2013160049A JP5723422B2 JP 5723422 B2 JP5723422 B2 JP 5723422B2 JP 2013160049 A JP2013160049 A JP 2013160049A JP 2013160049 A JP2013160049 A JP 2013160049A JP 5723422 B2 JP5723422 B2 JP 5723422B2
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thickness
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sheet metal
width direction
axle case
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JP2015030332A (en
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佐々木　真
真 佐々木
直之 西澤
直之 西澤
萌太 石井
萌太 石井
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Press Kogyo Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction 

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Description

本発明は、車両のアクスルシャフトや差動ギヤ機構等を収容する板金製アクスルケースに係り、特に、車幅方向の板厚の最適化を図ることで必要な強度を確保しつつ軽量化及び低コスト化を推進した板金製アクスルケースに関する。   The present invention relates to a sheet metal axle case that accommodates a vehicle axle shaft, a differential gear mechanism, and the like, and in particular, achieves a necessary weight reduction and a low weight while ensuring a necessary strength by optimizing a plate thickness in a vehicle width direction. This relates to a sheet metal axle case that promotes cost reduction.

トラック、バス、ＲＶ車等の車両に用いられるアクスルケースとして、素材板をプレス加工によって車幅方向に沿った溝型断面に成形して側板とし、この側板を一対向き合わせて溶接してなる板金製アクスルケースが知られている（特許文献１参照）。   As an axle case used in vehicles such as trucks, buses, RV cars, etc., a sheet metal is formed by forming a material plate into a groove-shaped cross section along the vehicle width direction by pressing to form a side plate, and welding the side plates in a pair facing each other. A manufactured axle case is known (see Patent Document 1).

図１、図２（ａ）に示すように、板金製アクスルケース１は、一対の側板２を溶接して成り、差動ギヤ機構を収容するため上下方向に膨出された膨出部分３ａを有する中央部３と、中央部３の車幅方向両端部に繋げて形成され矩形断面部分４ａを有する中間部４と、中間部４の車幅方向両端部に繋げて形成され円形断面部分５ａを有する先端部５とを備えている。中間部４には、車重Ｗが加わるサスペンション部品（スプリングシート６等）が溶接され、先端部５には、路面からの反力Ｒが加わる車輪を支持するスピンドル７が溶接される。   As shown in FIGS. 1 and 2 (a), a sheet metal axle case 1 is formed by welding a pair of side plates 2, and has a bulging portion 3a bulged in the vertical direction to accommodate a differential gear mechanism. A central portion 3 having an intermediate portion 4 having a rectangular cross-section portion 4a connected to both ends in the vehicle width direction of the central portion 3, and a circular cross-section portion 5a formed to be connected to both ends in the vehicle width direction of the intermediate portion 4; And a tip portion 5 having the same. A suspension part (spring seat 6 or the like) to which the vehicle weight W is applied is welded to the intermediate part 4, and a spindle 7 that supports a wheel to which a reaction force R from the road surface is applied is welded to the tip part 5.

板金製アクスルケース１の側板２は、強度上必要とされる板厚の鋼板が使用されている。従来、側板２の板厚は、先端部５とスピンドル７との溶接部の強度を満足する板厚、中間部４とサスペンション部品（スプリングシート６）との溶接部の強度を満足する板厚のうち、何れか厚い方の板厚が、板金製アクスルケース１の全体（先端部５、中間部４、中央部３）に亘って適用されていた。   As the side plate 2 of the sheet metal axle case 1, a steel plate having a thickness required for strength is used. Conventionally, the side plate 2 has a plate thickness that satisfies the strength of the welded portion between the tip portion 5 and the spindle 7 and a plate thickness that satisfies the strength of the welded portion between the intermediate portion 4 and the suspension component (spring seat 6). Of these, the thicker plate thickness was applied over the entire sheet metal axle case 1 (tip portion 5, intermediate portion 4, and central portion 3).

特開平８−１８７５３５号公報JP-A-8-187535

このため、板金製アクスルケース１の製品機能上、厚さが必要ない中央部３まで厚い板厚が与えられ、重量増加及び材料費増加を招いていた。すなわち、中央部３は、中間部４及び先端部５に対して上下方向に膨出された膨出部分３ａを有するため、中間部４及び先端部５よりも断面係数が大きく、中間部４及び先端部５よりも薄い板厚でも必要な強度（疲労及び降伏強度）が確保できるものの、過剰な板厚が与えられていた。   For this reason, in the product function of the sheet metal axle case 1, a thick plate thickness is given to the central portion 3 where the thickness is not necessary, resulting in an increase in weight and material cost. That is, since the central part 3 has the bulging part 3a bulged in the vertical direction with respect to the intermediate part 4 and the tip part 5, the section coefficient is larger than that of the intermediate part 4 and the tip part 5, and the intermediate part 4 and Although the required strength (fatigue and yield strength) can be ensured even with a plate thickness thinner than the tip 5, an excessive plate thickness is provided.

また、疲労及び降伏強度の観点から中間部４及び先端部５の板厚を考察すると、矩形断面部分４ａを有する中間部４の断面係数は、円形断面部分５ａを有する先端部５の断面係数よりも大きいため、中間部４の板厚は先端部５の板厚よりも薄い板厚で足りることになる。従って、中間部４の板厚と先端５部の板厚とが等しい状態は、最適な板厚分布とは言えない。   Further, when considering the plate thickness of the intermediate portion 4 and the tip portion 5 from the viewpoint of fatigue and yield strength, the section modulus of the intermediate portion 4 having the rectangular cross-section portion 4a is more than that of the tip portion 5 having the circular cross-section portion 5a. Therefore, it is sufficient that the thickness of the intermediate portion 4 is thinner than the thickness of the tip portion 5. Therefore, the state in which the plate thickness of the intermediate portion 4 is equal to the plate thickness of the tip portion 5 is not an optimal plate thickness distribution.

なお、上述した特許文献１には、板金製アクスルケース１の中央部３の板厚をその他の部分よりも薄くする点が開示されているが（文献１の段落００１０参照）、中間部４の板厚と先端部の板厚との大小関係については不明であり、車幅方向に沿った板厚分布が断面係数に応じて最適化されているとは言えず、改善の余地が残されている。   In addition, although patent document 1 mentioned above discloses that the thickness of the central portion 3 of the axle case 1 made of sheet metal is made thinner than the other portions (see paragraph 0010 of the reference 1), The size relationship between the plate thickness and the tip thickness is unknown, and it cannot be said that the plate thickness distribution along the vehicle width direction is optimized according to the section modulus, leaving room for improvement. Yes.

以上の事情を考慮して創案された本発明の目的は、車幅方向に沿った板厚を断面係数に応じて最適化することで、必要な強度を確保しつつ軽量化及び低コスト化を推進した板金製アクスルケースを提供することにある。   The object of the present invention, which was created in view of the above circumstances, is to reduce the weight and cost while ensuring the necessary strength by optimizing the plate thickness along the vehicle width direction according to the section modulus. It is to provide a propelled axle case made of sheet metal.

上記目的を達成すべく創案された本発明によれば、プレス加工によって車幅方向に沿った溝型断面に成形された側板を一対向き合わせて溶接して成り、差動ギヤ機構を収容するため上下方向に膨出された膨出部分を有する中央部と、中央部の車幅方向両端部に繋げて形成され矩形断面部分を有する中間部と、中間部の車幅方向両端部に繋げて形成され円形断面部分を有する先端部とを備え、中間部に、車重が加わるサスペンション部品が取り付けられ、先端部に、路面からの反力が加わるスピンドルが取り付けられ、外形が、車幅方向外方の先端部から車幅方向内方の中央部に向かって円形断面から矩形断面となり、中間部にて上下方向寸法が一定の矩形断面部分を有し、且つ、中間部の上下方向寸法よりも中央部の上下方向寸法が大きい板金製アクスルケースであって、先端部の板厚よりも中間部の板厚が薄く、中間部の板厚よりも中央部の板厚が薄く、中間部において、上下方向寸法が一定の矩形断面部分から中央部の膨出部分に向けて上下方向寸法が立ち上がる部分の板厚が、周辺部分の板厚よりも厚い、ことを特徴とする板金製アクスルケースが提供される。 In order to accommodate the differential gear mechanism, according to the present invention created to achieve the above object, a pair of side plates formed on a cross section of a groove mold along the vehicle width direction are welded face to face by pressing. A central part having a bulging part bulging in the vertical direction, an intermediate part having a rectangular cross section formed to be connected to both ends of the central part in the vehicle width direction, and being connected to both ends of the intermediate part in the vehicle width direction A suspension part to which the vehicle weight is applied is attached to the middle part, a spindle to which reaction force from the road surface is attached to the tip part, and the outer shape is outward in the vehicle width direction. From the front end of the vehicle to the center in the vehicle width direction, the circular cross section changes to a rectangular cross section, and the intermediate portion has a rectangular cross section with a constant vertical dimension, and is centered more than the vertical dimension of the intermediate part. vertical dimension is large plate parts Form-axle case, thin plate thickness of the intermediate portion than the thickness of the tip portion, the thickness of the central portion than the thickness of the intermediate portion is rather thin, the intermediate portion, the vertical dimension is constant rectangular cross-section There is provided a sheet metal axle case characterized in that the plate thickness of the portion whose vertical dimension rises from the portion toward the bulging portion at the center is thicker than the plate thickness of the peripheral portion .

中間部において、サスペンション部品が取り付けられる部分の板厚がそれ以外の部分の板厚よりも厚くなっていてもよい。   In the intermediate portion, the plate thickness of the portion to which the suspension component is attached may be thicker than the plate thickness of the other portion.

先端部に、ブレーキフランジが取り付けられ、先端部において、ブレーキフランジが取り付けられる部分の板厚がそれ以外の部分の板厚よりも厚くなっていてもよい。   A brake flange may be attached to the tip, and the thickness of the portion where the brake flange is attached may be thicker than the thickness of the other portion at the tip.

側板は、車幅方向に板厚が異なった素材板を溝型断面にプレス加工したものであり、素材板は、一対の圧延ロールの間に板材を挟んで送り出す際、これらロール同士の軸間距離を変更することで送り出し方向に板厚を異ならせる差厚ロール加工によって成形されたものであってもよい。   The side plate is made by pressing a material plate with a different thickness in the vehicle width direction into a groove-shaped cross section, and when the material plate is fed with a plate material sandwiched between a pair of rolling rolls, It may be formed by differential thickness roll processing in which the plate thickness is varied in the feeding direction by changing the distance.

本発明に係る板金製アクスルケースによれば、車幅方向に沿った中央部と中間部と先端部との断面係数の大小に応じて車幅方向に板厚の最適化を図ったので、必要な強度を確保しつつ軽量化及び低コスト化を図ることができる。   According to the sheet metal axle case according to the present invention, the plate thickness is optimized in the vehicle width direction according to the size of the section modulus of the central portion, the intermediate portion, and the tip portion along the vehicle width direction. It is possible to achieve weight reduction and cost reduction while securing a sufficient strength.

板金製アクスルケースの斜視図である。It is a perspective view of a sheet metal axle case. （ａ）は板金製アクスルケースの正面図、（ｂ）は従来品の板厚分布（一定）と発明品の板厚分布（三段階）とを示す説明図、（ｃ）は従来品と発明品との曲げモーメント、断面係数、応力を表したダイアグラムである。(A) is a front view of a sheet metal axle case, (b) is an explanatory diagram showing a plate thickness distribution (constant) of a conventional product and a plate thickness distribution (three stages) of an invention product, and (c) is a conventional product and an invention. This diagram shows the bending moment, section modulus, and stress with the product.

以下に添付図面を参照しながら、本発明の好適な実施形態について詳細に説明する。係る実施形態に示す寸法、材料、その他具体的な数値等は、発明の理解を容易にするための例示に過ぎず、特に断る場合を除き、本発明を限定するものではない。なお、本明細書及び図面において、実質的に同一の機能、構成を有する要素については、同一の符号を付することにより重複説明を省略し、また本発明に直接関係のない要素は図示を省略する。   Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiment are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

（第１実施形態）
図１、図２（ａ）に示すように、本実施形態に係る板金製アクスルケース１は、プレス加工によって車幅方向に沿った溝型断面に成形された側板２を、一対、向き合わせて溶接して構成されている。この板金製アクスルケース１は、差動ギヤ機構を収容するため上下方向に膨出された膨出部分３ａを有する中央部３と、中央部３の車幅方向両端部に繋げて形成され矩形断面部分４ａを有する中間部４と、中間部４の車幅方向両端部に繋げて形成され円形断面部分５ａを有する先端部５とを備えている。中間部４には、車重Ｗが加わるサスペンション部品（例えばスプリングシート６）が溶接等で取り付けられ、先端部５には、路面からの反力Ｒが加わるスピンドル７が溶接等で取り付けられる。また、先端部５には、ブレーキ部品を支持するブレーキフランジ８が溶接等で取り付けられる。 (First embodiment)
As shown in FIGS. 1 and 2 (a), a sheet metal axle case 1 according to the present embodiment has a pair of side plates 2 that are formed into a cross section in a groove shape along the vehicle width direction by pressing. It is constructed by welding. The sheet metal axle case 1 is formed by connecting a central portion 3 having a bulging portion 3a bulging in the vertical direction to accommodate the differential gear mechanism, and both ends of the central portion 3 in the vehicle width direction. The intermediate part 4 which has the part 4a, and the front-end | tip part 5 which is connected and formed in the vehicle width direction both ends of the intermediate part 4, and has the circular cross-section part 5a are provided. A suspension component (for example, a spring seat 6) to which the vehicle weight W is applied is attached to the intermediate portion 4 by welding or the like, and a spindle 7 to which a reaction force R from the road surface is applied to the tip portion 5 by welding or the like. A brake flange 8 that supports brake components is attached to the tip 5 by welding or the like.

図２（ｂ）に示すように、従来品の板金製アクスルケース１の板厚は、車幅方向に沿って、先端部５、中間部４、中央部３が全て一定となっている。これに対して、発明品（本発明の一実施形態）の板金製アクスルケース１の板厚は、車幅方向に沿って、先端部５の板厚よりも中間部４の板厚が薄く、中間部４の板厚よりも中央部３の板厚が薄くなっている。具体的には、従来品の板厚は、先端部５、中間部４、中央部３にて全て１２．５ｍｍで一定であるのに対し、発明品の板厚は、先端部５で１２．５ｍｍ、中間部４で１１ｍｍ、中央部３で９ｍｍとなっている。なお、これらの数値は例示であり、本発明を限定するものではない。   As shown in FIG. 2 (b), the plate thickness of the conventional sheet metal axle case 1 is constant at the front end portion 5, the intermediate portion 4, and the central portion 3 along the vehicle width direction. On the other hand, the plate thickness of the sheet metal axle case 1 of the invention product (one embodiment of the present invention) is thinner in the intermediate portion 4 than the plate thickness of the tip portion 5 along the vehicle width direction. The thickness of the central portion 3 is thinner than the thickness of the intermediate portion 4. Specifically, the plate thickness of the conventional product is constant at 12.5 mm at the tip portion 5, the intermediate portion 4, and the central portion 3, whereas the plate thickness of the invention product is 12.2 mm at the tip portion 5. 5 mm, 11 mm at the middle part 4 and 9 mm at the central part 3. In addition, these numerical values are illustrations and do not limit the present invention.

このように車幅方向の板厚が先端部５、中間部４、中央部３にて異なっている発明品の板金製アクスルケース１は、車幅方向に板厚が異なった溝型断面の側板２を一対向き合わせて溶接して製造される。側板は、車幅方向に板厚が異なった素材板をプレス加工して成形される。素材板は、一定厚さの板材を加熱して一対の圧延ロールの間に挟んで送り出す際、これらロール同士の軸間距離を変更することで送り出し方向に板厚を異ならせる差厚ロール加工によって成形される。かかる差厚ロール加工によれば、厚さ一定の板材から送り出し方向（車幅方向）に板厚が異なった素材板を得ることができ、且つ、全体を圧延することによる加工硬化によって素材強度が向上する。   In this way, the sheet metal axle case 1 having different plate thicknesses in the vehicle width direction at the front end portion 5, the intermediate portion 4, and the central portion 3 is a side plate having a grooved cross section with different plate thicknesses in the vehicle width direction. Manufactured by welding two facing each other. The side plate is formed by pressing a material plate having a different thickness in the vehicle width direction. When the sheet material is heated and fed between a pair of rolling rolls by feeding a sheet material of a certain thickness, by changing the distance between the axes of these rolls, by differential thickness roll processing that varies the sheet thickness in the feeding direction Molded. According to such differential thickness roll processing, it is possible to obtain a material plate having a different thickness in the feeding direction (vehicle width direction) from a plate material having a constant thickness, and the material strength is increased by work hardening by rolling the whole. improves.

図２（ａ）の板金製アクスルケース１において、中間部４にスプリングシート６を取り付け、先端部５にスピンドル７を取り付けた状態とし、スプリングシート６に車重Ｗが加わり、スピンドル７に路面からの反力Ｒが加わると、図２（ｃ）上段に示すように、曲げモーメント（Ｍ）が発生する。すなわち、図２（ｃ）上段は、上述した車重Ｗと路面反力Ｒに対するベンディングモーメントダイアグラム（ＢＭＤ）を示す。曲げモーメントは、左右の路面反力Ｒを受ける点から車重Ｗを受ける点まで増大し、車重Ｗを受ける点同士の間で一定となる。   In the sheet metal axle case 1 of FIG. 2A, the spring seat 6 is attached to the intermediate portion 4 and the spindle 7 is attached to the distal end portion 5. A vehicle weight W is applied to the spring seat 6, and the spindle 7 is moved from the road surface. When the reaction force R is applied, a bending moment (M) is generated as shown in the upper part of FIG. That is, the upper part of FIG. 2C shows a bending moment diagram (BMD) with respect to the vehicle weight W and the road surface reaction force R described above. The bending moment increases from the point receiving the left and right road surface reaction force R to the point receiving the vehicle weight W, and is constant between the points receiving the vehicle weight W.

図２（ｃ）中段は、板金製アクスルケース１の断面係数（Ｚ）を示す。断面係数は、発明品及び従来品とも、先端部５の断面係数よりも中間部４の断面係数が大きく、中間部４の断面係数よりも中央部３の断面係数が大きい。発明品及び従来品とも、基本的な外形が、車幅方向外方から内方に向かって円形断面から矩形断面となり、且つ、先端部５の上下方向寸法よりも中間部４の上下方向寸法が大きく、中間部４の上下方向寸法よりも中央部３の上下方向寸法が大きい形状となっているからである。   The middle part of FIG. 2C shows the section modulus (Z) of the axle case 1 made of sheet metal. The section modulus of the intermediate part 4 is larger than that of the tip part 5 and the section coefficient of the central part 3 is larger than that of the intermediate part 4 in both the invention product and the conventional product. In both the invention product and the conventional product, the basic outer shape changes from a circular cross section to a rectangular cross section from the outside in the vehicle width direction to the inside, and the vertical dimension of the intermediate part 4 is larger than the vertical dimension of the tip part 5. This is because the vertical dimension of the central part 3 is larger than the vertical dimension of the intermediate part 4.

特徴としては、中央部３においては、発明品の板厚が従来品の板厚よりも薄いため、発明品の断面係数が従来品の断面係数よりも小さくなっている点が挙げられる。同様に、中間部４においても、発明品の板厚が従来品の板厚よりも薄いため、図では厳密に表示し難いが、発明品の断面係数が従来品の断面係数よりも小さくなっている。先端部５においては、発明品の板厚と従来品の板厚とが等しいため、図では厳密に表示し難いが、発明品の断面係数と従来品の断面係数とは等しい。   As a feature, since the thickness of the invention product is thinner than that of the conventional product in the central portion 3, the section modulus of the invention product is smaller than that of the conventional product. Similarly, in the intermediate portion 4, the thickness of the invention product is thinner than that of the conventional product, so that it is difficult to display strictly in the figure, but the section modulus of the invention product is smaller than that of the conventional product. Yes. At the tip 5, the plate thickness of the invention product is equal to the plate thickness of the conventional product, so that it is difficult to display exactly in the figure, but the section modulus of the invention product is equal to that of the conventional product.

図２（ｃ）下段は、上述した車重Ｗ及び路面反力Ｒが加わる板金製アクスルケース１に生じる応力（σ）を示す。応力（σ）は曲げモーメント（Ｍ）を断面係数（Ｚ）で除することで算出される。中央部３においては、発明品及び従来品とも曲げモーメント（Ｍ）が一定であり、断面係数（Ｚ）が従来品よりも発明品が小さいので、応力（σ）は発明品が従来品よりも大きくなる。但し、許容応力を越えることはなく、必要な強度（疲労及び降伏強度）は保たれる。すなわち、従来品は、中央部３の板厚が過剰で、重量増加、材料費増加を招いていたが、発明品であれば、必要な強度を保持しつつ、それらを解消できる。中間部４の応力（σ）についても同様である。   The lower part of FIG. 2C shows the stress (σ) generated in the sheet metal axle case 1 to which the above-described vehicle weight W and road surface reaction force R are applied. The stress (σ) is calculated by dividing the bending moment (M) by the section modulus (Z). In the central portion 3, the bending moment (M) is constant for both the inventive product and the conventional product, and the sectional modulus (Z) is smaller for the inventive product than for the conventional product, so the stress (σ) is higher for the inventive product than for the conventional product. growing. However, the required strength (fatigue and yield strength) is maintained without exceeding the allowable stress. That is, in the conventional product, the plate thickness of the central portion 3 is excessive, which causes an increase in weight and material cost. However, if the product is an invention product, it can be solved while maintaining necessary strength. The same applies to the stress (σ) of the intermediate portion 4.

（作用・効果）
以上説明したように、本実施形態に係る板金製アクスルケース１によれば、車幅方向に沿った中央部３と中間部４と先端部５との断面係数の大小に応じて車幅方向の板厚の最適化を図ったので、必要な強度を確保しつつ軽量化及び低コスト化を図ることができる。すなわち、先端部５の断面係数よりも中間部４の断面係数が大きく、中間部４の断面係数よりも中央部３の断面係数が大きいので、これに応じて、先端部５の板厚よりも中間部４の板厚を薄く、中間部４の板厚よりも中央部３の板厚を薄くすることで、車重Ｗ及び路面反力Ｒに対して必要な強度を確保しつつ、軽量化及び低コスト化を図れる。 (Action / Effect)
As described above, according to the sheet metal axle case 1 according to the present embodiment, the width in the vehicle width direction depends on the cross-sectional coefficients of the central portion 3, the intermediate portion 4, and the tip portion 5 along the vehicle width direction. Since the plate thickness has been optimized, it is possible to reduce the weight and cost while ensuring the necessary strength. That is, since the section modulus of the intermediate portion 4 is larger than the section modulus of the tip portion 5 and the section modulus of the central portion 3 is larger than the section modulus of the intermediate portion 4, accordingly, the plate thickness of the tip portion 5 is larger. By reducing the thickness of the intermediate portion 4 and making the thickness of the central portion 3 thinner than the thickness of the intermediate portion 4, the weight is reduced while ensuring the necessary strength against the vehicle weight W and the road surface reaction force R. In addition, the cost can be reduced.

このように、本実施形態に係る板金製アクスルケース１によれば、側板２の車幅方向に沿った各部位に対し、その部位の断面係数に応じた最適な板厚分布としているので、実際上問題となる疲労強度低下、剛性低下を招くことなく、製品（板金製アクスルケース１）の重量を抑え、且つ材料費を削減し、安価に製品を製造できる。具体的には、許容軸重８、５００ｋｇクラスの板金製アクスルケース１に本発明を適用した場合、製品重量で９．４％減（６６．９ｋｇから６０．６ｋｇ）、材料費で１２％減という大きな効果を得ることができる。   As described above, according to the sheet metal axle case 1 according to the present embodiment, for each part along the vehicle width direction of the side plate 2, the optimum thickness distribution according to the section modulus of the part is used. The product (sheet metal axle case 1) can be reduced in weight, the material cost can be reduced, and the product can be manufactured at low cost without causing the above-described problems of fatigue strength reduction and rigidity reduction. Specifically, when the present invention is applied to a sheet metal axle case 1 having an allowable shaft weight of 8,500 kg class, the product weight is reduced by 9.4% (from 66.9 kg to 60.6 kg), and the material cost is reduced by 12%. A great effect can be obtained.

（第２実施形態）
本発明の第２実施形態に係る板金製アクスルケース１を図２（ｂ）を用いて説明する。第２実施形態に係る板金製アクスルケース１は、基本的な構成が第１実施形態に係る板金製アクスルケース１と同様であり、中間部４において、矩形断面部分４ａから中央部３の膨出部分３ａに向かう部分Ｘの板厚がそれ以外の部分の板厚よりも厚くなっているものである。 (Second Embodiment)
A sheet metal axle case 1 according to a second embodiment of the present invention will be described with reference to FIG. The sheet metal axle case 1 according to the second embodiment has the same basic configuration as the sheet metal axle case 1 according to the first embodiment. In the intermediate portion 4, the central portion 3 bulges from the rectangular cross section 4a. The thickness of the portion X toward the portion 3a is thicker than the thickness of the other portions.

この部分Ｘは、図２（ｃ）に示すように、曲げモーメント（Ｍ）が一定で断面係数（Ｚ）が大きく立ち上がる部分であるので、応力（σ）が急激に変化して応力集中を招き易い部分である。従って、中間部４における上記部分Ｘの板厚を厚くすることで、それ以外の部分の中間部４の板厚を従来品よりも薄くしたとしても、必要な強度（疲労及び降伏強度）を確保できる。具体的には、中間部４の板厚を１１ｍｍとすると、上記部分Ｘの板厚は１２ｍｍ程度となる。   As shown in FIG. 2 (c), the portion X is a portion where the bending moment (M) is constant and the section modulus (Z) rises greatly, so that the stress (σ) changes suddenly and causes stress concentration. Easy part. Therefore, the necessary strength (fatigue and yield strength) is ensured by increasing the thickness of the portion X in the intermediate portion 4 even if the thickness of the intermediate portion 4 in other portions is made thinner than that of the conventional product. it can. Specifically, when the thickness of the intermediate portion 4 is 11 mm, the thickness of the portion X is about 12 mm.

なお、中間部４における上記部分Ｘの上下方向の矩形断面寸法を拡大し、断面係数（Ｚ）を大きくすることによっても、応力（σ）を下げることができるので、応力集中を抑えられるが、中間部４の上方には車体フレームに取り付けられる様々な部品が存在するので、それら部品が邪魔になって中間部４における上記部分Ｘの上下方向の寸法を拡大できないケースが多く、その様な場合に上記部分Ｘの板厚を部分的に厚くする対策は有効である。第２実施形態の基本的な作用効果は、第１実施形態と同様である。   In addition, since the stress (σ) can be reduced by enlarging the vertical cross-sectional dimension of the portion X in the intermediate portion 4 and increasing the section modulus (Z), stress concentration can be suppressed. Since there are various parts attached to the vehicle body frame above the intermediate part 4, there are many cases where these parts are in the way and the vertical dimension of the part X in the intermediate part 4 cannot be enlarged. In addition, a measure to partially increase the thickness of the portion X is effective. The basic operational effects of the second embodiment are the same as those of the first embodiment.

また、中間部４において、サスペンション部品（スプリングシート６等）が溶接により取り付けられる部分Ｙの板厚がそれ以外の部分の板厚よりも厚くなっていてもよい。これにより、中間部４の板厚が従来品よりも薄くなっていても、必要な溶接強度を容易に確保できる。また、先端部５において、ブレーキフランジ８が溶接により取り付けられる部分Ｚの板厚がそれ以外の部分の板厚よりも厚くなっていてもよい。これにより、必要な溶接強度を容易に確保できる。   Moreover, in the intermediate part 4, the plate | board thickness of the part Y to which suspension components (spring seat 6 grade | etc.) Are attached by welding may be thicker than the plate | board thickness of a part other than that. Thereby, even if the plate | board thickness of the intermediate part 4 is thinner than the conventional product, required welding strength can be ensured easily. Moreover, in the front-end | tip part 5, the plate | board thickness of the part Z to which the brake flange 8 is attached by welding may be thicker than the plate | board thickness of the other part. Thereby, required welding strength can be ensured easily.

以上、添付図面を参照しつつ本発明の好適な実施形態について説明したが、本発明は上述した各実施形態に限定されないことは勿論であり、特許請求の範囲に記載された範疇における各種の変更例又は修正例についても、本発明の技術的範囲に属することは言うまでもない。例えば、上側の側板と下側の側板とを同一形状とし、金型を共用して低コスト化を図ってもよい。   The preferred embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiments, and various modifications within the scope of the claims. Needless to say, examples and modifications also belong to the technical scope of the present invention. For example, the upper side plate and the lower side plate may have the same shape, and the cost may be reduced by sharing a mold.

本発明は、プレス加工によって車幅方向に沿った溝型断面に成形された側板を、一対、向き合わせて溶接して成る板金製アクスルケースに利用できる。   INDUSTRIAL APPLICABILITY The present invention can be used in a sheet metal axle case formed by pressing a pair of side plates formed into a cross section in a groove shape along the vehicle width direction by press working.

１ 板金製アクスルケース
２ 側板
３ 中央部
３ａ 膨出部分
４ 中間部
４ａ 矩形断面部分
５ 先端部
５ａ 円形断面部分
６ サスペンション部品（スプリングシート）
７ スピンドル
８ ブレーキフランジ
Ｍ 曲げモーメント
Ｚ 断面係数
σ 応力
Ｗ 車重
Ｒ 路面反力
Ｘ 中間部において矩形断面部分から中央部の膨出部分に向かう部分
Ｙ 中間部においてサスペンション部品が取り付けられる部分
Ｚ 先端部においてブレーキフランジが取り付けられる部分 DESCRIPTION OF SYMBOLS 1 Sheet metal axle case 2 Side plate 3 Center part 3a Swelling part 4 Middle part 4a Rectangular cross-section part 5 Front-end | tip part 5a Circular cross-section part 6 Suspension components (spring seat)
7 Spindle 8 Brake flange M Bending moment Z Section modulus σ Stress W Vehicle weight R Road surface reaction force X In the middle part, the part Y from the rectangular cross-section part to the bulging part in the middle part In the middle part, the part Z where the suspension parts are attached Where the brake flange is attached

Claims (4)

プレス加工によって車幅方向に沿った溝型断面に成形された側板を一対向き合わせて溶接して成り、
差動ギヤ機構を収容するため上下方向に膨出された膨出部分を有する中央部と、該中央部の車幅方向両端部に繋げて形成され矩形断面部分を有する中間部と、該中間部の車幅方向両端部に繋げて形成され円形断面部分を有する先端部とを備え、
前記中間部に、車重が加わるサスペンション部品が取り付けられ、前記先端部に、路面からの反力が加わるスピンドルが取り付けられ、
外形が、車幅方向外方の前記先端部から車幅方向内方の前記中央部に向かって円形断面から矩形断面となり、前記中間部にて上下方向寸法が一定の前記矩形断面部分を有し、
且つ、前記中間部の上下方向寸法よりも前記中央部の上下方向寸法が大きい板金製アクスルケースであって、
前記先端部の板厚よりも前記中間部の板厚が薄く、前記中間部の板厚よりも前記中央部の板厚が薄く、
前記中間部において、上下方向寸法が一定の前記矩形断面部分から前記中央部の膨出部分に向けて上下方向寸法が立ち上がる部分の板厚が、周辺部分の板厚よりも厚い、ことを特徴とする板金製アクスルケース。 A pair of side plates formed on the cross section of the groove mold along the vehicle width direction by press working are welded to face each other.
A central portion having a bulging portion bulging in the vertical direction to accommodate the differential gear mechanism, an intermediate portion having a rectangular cross-section portion connected to both ends of the central portion in the vehicle width direction, and the intermediate portion A front end portion having a circular cross-section portion connected to both ends in the vehicle width direction,
A suspension part to which vehicle weight is applied is attached to the intermediate part, and a spindle to which reaction force from the road surface is attached to the tip part,
The outer shape changes from a circular cross section to a rectangular cross section from the front end portion in the vehicle width direction to the central portion in the vehicle width direction, and has the rectangular cross section having a constant vertical dimension at the intermediate portion. ,
And the sheet metal axle case having a larger vertical dimension of the central part than a vertical dimension of the intermediate part,
The plate thickness of the intermediate portion than the thickness of the tip thin, the plate thickness of the central portion than the thickness of the intermediate portion is rather thin,
In the intermediate portion, the thickness of the portion where the vertical dimension rises from the rectangular cross-sectional portion having a constant vertical dimension toward the bulging portion of the central portion is thicker than the thickness of the peripheral portion. Sheet metal axle case. 前記中間部において、前記サスペンション部品が取り付けられる部分の板厚がそれ以外の部分の板厚よりも厚い、ことを特徴とする請求項１に記載の板金製アクスルケース。   2. The sheet metal axle case according to claim 1, wherein a thickness of a portion to which the suspension component is attached is thicker than a thickness of the other portion in the intermediate portion. 前記先端部に、ブレーキフランジが取り付けられ、
前記先端部において、前記ブレーキフランジが取り付けられる部分の板厚がそれ以外の部分の板厚よりも厚い、ことを特徴とする請求項１又は２に記載の板金製アクスルケース。 A brake flange is attached to the tip,
3. The sheet metal axle case according to claim 1, wherein a thickness of a portion to which the brake flange is attached is thicker than a thickness of the other portion at the tip portion. 前記側板は、車幅方向に板厚が異なった素材板を溝型断面にプレス加工したものであり、
該素材板は、一対の圧延ロールの間に板材を挟んで送り出す際、これらロール同士の軸間距離を変更することで送り出し方向に板厚を異ならせる差厚ロール加工によって成形されたものである、ことを特徴とする請求項１から３の何れか１項に記載の板金製アクスルケース。 The side plate is obtained by pressing a material plate having a different thickness in the vehicle width direction into a groove-shaped cross section,
The raw material plate is formed by a differential thickness roll process in which the plate thickness is changed in the feed direction by changing the inter-axis distance between the rolls when the plate material is fed between a pair of rolling rolls. The axle case made of sheet metal according to any one of claims 1 to 3, wherein
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JPH0741339B2 (en) * 1992-02-24 1995-05-10 プレス工業株式会社 Axle case press molding method
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