What is a dowel pin

Properties of a pin connection

The most famous forms of Pens are Straight pins, Taper pins and Grooved pins.

Irrespective of the shape, pins have in common that you first drill a mounting hole through the parts to be connected and then press in the appropriate pin, which is oversized in relation to the hole.

This then results in two basic types of application for pens:

  1. Position fixation: For this purpose, "fixing pins" are hammered in, which are intended to ensure the position of parts to be connected later. The pins are therefore not used for power transmission, but only for positioning. $ \ rightarrow $ processing and assembly purposes

    The power transmission must be done by other elements such as screws.

  2. Power transmission: Here the pin is used as a load-bearing element and is dimensioned in such a way that it can also handle a single force transmission. This is true even when using multiple pens. $ \ rightarrow $ Risk of double pass

    It is important here that there is sufficient shear strength, which must be calculated in advance.

Overview of possible uses

Regardless of the type of application, we summarize all possible uses of pens:

  • Transmission of moments $ \ rightarrow $ Shafts and axles with hubs, levers or collars
  • Introduction of forces $ \ rightarrow $ Spring or rope forces via pins
  • Securing the situation $ \ rightarrow $ components remain in their position to one another, e.g. bearing block to foundation.
  • Secured against twisting $ \ rightarrow $ split pins secure screw connections.
  • Protection against overload $ \ rightarrow $ pins prevent overloading of coupling flanges.
  • Attaching without any further function $ \ rightarrow $ pins for attaching signs to machines

Overview of geometries

Below you can see an overview of various pins with different structural arrangements.

Types and positions of pens

With a power transmission is theCross pin to be preferred, since a clear calculation of the loads and stresses is possible. This includes the calculations of the surface pressure, the shear and the bending.Along- and Tangential pins on the other hand, they are not suitable for the transmission of larger and more dynamic force values ​​and cause additional problems during assembly.

To theirs Passport- andPositioning function To meet the requirements, the pins are only drilled and rubbed during assembly on site. In addition, installation takes place at least partially under pretension. This preload is brought about by elastic and partially plastic deformation of the pin.