A crown gear is a gear which has teeth that project at right angles to the face of the wheel. In particular, a crown gear is a type of bevel gear where the pitch cone angle is 90 degrees. A pitch cone of any other angle is simply called a bevel gear. Crown gears normally mesh with other bevel gears, or sometimes spur gears.
– Introduction
What is a crown gear ？
Crown gears, also known as contrate gears, are a type of bevel gear whose teeth project at right angles to the plane of the wheel. This makes the teeth resemble the points of a crown, giving the gear its name. Unlike conical bevel gears, crown gears are cylindrical. They can either be paired with other bevel gears or spur gears, depending on the tooth design.Crown gears are typically used for applications where low noise-emitting gears are required.
A crown gear used with a rack’s interlocking clogs allows the gear to roll along with the rack even if it has to go uphill or sideways. They are used for trains on uphill tracks, rollercoasters, locking doors on tracks, and car steering wheels.
What is a crown gear used for？
Trains on an uphill track
Trains that must travel uphill may use crown wheels instead of smooth wheels and the track the train must travel up may be a pinion.
Car steering wheel
In a car’s rack and pinion steering system, the pinion is a round column with teeth running along its shaft. The pinion interlocks and runs along the rack at 90 degrees –- a collar holds it in place.
Locking Doors on a Track
Rack and pinion systems are useful for doors or cutting mechanisms that must stay on a precise track.
What is Gear Crowning?
Gear crowning “involves changing the chordal thickness of the tooth along its axis. This modification eliminates end bearing by offering a contact bearing in the center of the gear.”
Solving Gear Noise and Misalignment
Gears can generate unnecessary amounts of noise and vibration when paired together. The sound of metal on metal, coupled with inconsistencies in some production lines, corrosion and natural wear and tear can make for some harsh and grating sounds. As gearboxes get smaller and smaller with advancing technology, it becomes even more difficult to maintain these gears as they naturally age and keep the quality at a level where noise and misalignment don’t become a problem.
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Advantages of gear crowning
By using a process like gear crowning, you can decrease the amount of sound in a gear pairing as well as decrease vibration, which can lead to the longevity of the parts of your assembly. Another common use for crowning is to counter offset loads commonly found in cantilevered gear shafts. In this case the crown on the lead would be offset to the center of the gear face width. By considering the above uses of crowning, as well as others, you will also increase user loyalty when your parts outlast the competitor’s.
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