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Optical 3D measuring apparatus used for measuring chamber volume of a cylinder head and chamber volume correcting method for a cylinder head of an engine

  • US 5,517,311 A
  • Filed: 05/24/1994
  • Issued: 05/14/1996
  • Est. Priority Date: 05/25/1993
  • Status: Expired due to Fees
First Claim
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1. A chamber volume correcting method for a cylinder head of an internal combustion engine, a chamber surface of said cylinder head being machined so as to adjust a volume of a chamber to a predetermined target volume at which chamber surface a chamber is open, said chamber volume correcting method comprising the steps of:

  • (a) projecting a slit beam onto an inner surface of said chamber of the cylinder head so as to form an optical cutting line on said inner surface of said chamber, and receiving an image of the optical cutting line by an optical sensor, the slit beam being scanned in a direction perpendicular to the longitudinal direction of the slit beam;

    (b) obtaining a contour of a vertical section corresponding to the optical cutting line so as to obtain a vertical section area, and calculating a volume of said chamber by means of integral calculus in accordance with each vertical section corresponding to each scanning position of the slit beam by interpolating between points of the cutting line so as to define a lid and a bottom of the contour;

    (c) determining a relationship between a cutting depth from said chamber surface and a change in volume of said chamber(d) calculating a cutting depth by which the volume of said chamber becomes the predetermined target volume in accordance with said relationship determined in step (c); and

    (e) machining said chamber surface of said cylinder head by the cutting depth calculated in step (d).

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