Perforated wreath

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Technical drawing of a perforated ring

In technology, a ring or disk is generally referred to as a perforated ring , the surface of which is provided with regularly arranged holes . Perforated rings can be found, for example, on many round components in connection and fastening technology .

The holes of a perforated ring are usually distributed on the circumference of one or more specific hole circles , the diameter of which determines the distance between the holes and the center of the perforated ring. The distance between the holes on the bolt circle is indicated by the angle that two neighboring holes form to the center of the bolt circle. The diameter of the holes themselves as well as their design depends on the intended use and the function of the perforated ring. For example, the bores can also be designed as threaded bores .

Perforated rings are often used in 15 °, 30 °, 45 ° or 60 ° steps, but it is also common to divide the ring into an odd number of parts or holes. Correspondingly, perforated rings are used in the descriptive geometry of technical drawing with the help of special construction methods such as B. the construction of a pentagon or hexagon . In the past, perforated rings were designed with the help of a compass and manufactured with a dividing head ; today, designers usually use CAD to calculate such structures .

A perforated ring can also contain so-called elongated holes , which z. B. sweep over an angle of 15 ° and so extend from one imaginary hole to the next.

Examples of the technical application of perforated rings are:

  • Perforated ring in a wheel disc for mounting the wheel on the vehicle or as a design element
  • Perforated wreath on a flange to connect the flange to another component or flange
  • Perforated ring on a planetary roller screw drive to mount the planetary rollers
  • Perforated ring on a Nipkow disc
  • Perforated wreath on a keg
  • Finger perforated disk from an old telephone
  • Use of perforated rings

  • Perforated rim of a wheel flange

  • Perforated rim as a design element on the wheel of a Porsche 356

  • Perforated rings of a torque measuring device

  • Perforated ring on a Nipkow disc