Cogwheel

A cog wheel ( MHG Kamprat; . Engl Cogwheel ) is a gear whose teeth stand out like a comb. The two basic forms are the spur gear, wherein the teeth protrude perpendicularly to the axis of rotation from the periphery of the rim and the crown wheel, the cogged wheel in a narrow sense, in which the teeth angled laterally protrude from the wheel in parallel with or slightly to the axis of rotation. The term crown wheel is usually used in the mill technology for a cog wheel with vertical axis, thereby reminding the crest of a crown.

In German dictionary of the Brothers Grimm in 1854 was the definition:

Cogwheels can be found in many historical machines, especially mills. Usually the wheel which passes the rotational movement of the blade axis in the machine, or Wasserradwelle as cogwheel is executed. Comb wheels are often made of elm or oak, which is arranged to increase the stability in several staggered layers. For the teeth or combs the wood of hornbeam has been widely used. The teeth are used individually, whereby they can be easily replaced in case of wear or damage. Because of easier maintenance, lower cost and less noise to wooden comb wheels could argue until the 20th century against metal.

The transmission of rotary motion can be depending on the design of the transmission between parallel or angularly disposed axes of rotation. A spur gear for paraxial transmission consists of a spur gear and a crown or a stick or spindle wheel. To transfer the angular gear consist of two cog wheels or are designed as cogwheel - Stockrad transmission.

Arrettierung of the teeth on the back with wooden wedges

Fixation using metal pins

Cogwheel ( Bunkler ) with two rows of combs