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Automobile undercarriage component

  • US 9,884,531 B2
  • Filed: 12/09/2014
  • Issued: 02/06/2018
  • Est. Priority Date: 12/19/2013
  • Status: Active Grant
First Claim
Patent Images

1. An automobile undercarriage component comprising:

  • an elongated arm comprising a web; and

    a rib connected to the web in a direction parallel to the plane of the web and transverse to the direction of elongation of the web, the rib having an inner wall surface extending from the rib to terminate at a leading end which is the end of the rib farthest from the web in a direction perpendicular to the plane of the web;

    wherein the rib includes a first section and a second section which are respectively arranged along the direction of elongation of the arm, wherein the second section is located adjacent a distal end of the arm in the direction of elongation and is arranged closer to the distal end than is the first section, a leading end of the second section having a width in the direction parallel to the plane of the web and transverse to the direction of elongation of the arm which is narrower than the width of a leading end of the first section, as an inner wall surface is disposed closer to an opposing outer wall surface in the second section as compared to the first section;

    wherein the first section includes a first inner wall surface formed and a first outer wall surface opposing the first inner wall surface, the first inner wall surface having an inclination angle θ

    of θ

    a (°

    ), an angular portion formed on the leading end of the first inner wall surface having a curvature radius R of Ra (mm), the first outer wall surface having an inclination angle θ

    of θ

    b (°

    ), an angular portion formed on the leading end of the first outer wall surface having a curvature radius R of Rb (mm), and a planar portion formed between the two angular portions having a width of ws (mm);

    wherein the second section includes a second inner wall surface and a second outer wall surface, the second inner wall surface having an inclination angle θ

    of θ

    a′



    ), an angular portion formed on the leading end of the second inner wall surface having a curvature radius R of Ra′

    (mm), the second outer wall surface having an inclination angle θ

    of θ

    b′



    ), an angular portion formed on the leading end of the second outer wall surface having a curvature radius R of Rb′

    (mm), and a planar portion formed between the two angular portions having a width of ws′

    (mm); and

    wherein, when wa, wb, wa′

    , and wb′

    are defined to satisfy the equations wa=Ra×

    cos θ

    a−

    (Ra−

    Ra×

    sin θ

    a)×

    tan θ

    a, wb=Rb×

    cos θ

    b−

    (Rb−

    Rb×

    sin θ

    b)×

    tan θ

    b, wa′

    =Ra′

    ×

    cos θ

    a′



    (Ra′



    Ra′

    ×

    sin θ

    a′



    tan θ

    a′

    , and wb′

    =Rb′

    ×

    cos θ

    b′



    (Rb′



    Rb′

    ×

    sin θ

    b′



    tan θ

    b′

    , the difference L (mm) in width between the first section and the second section is expressed by the equation L={(wa−

    wa′

    )+(wb−

    wb′

    )+(ws−

    ws′

    )} and L>

    0.

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