What are the types of spur gear?
There are three main classes of spur gears: external tooth, internal tooth, and rack-and-pinion.
What is another name for spur gear?
Spur gears are known by quite a few other names including straight gears, straight-cut gears, spur wheels, and spur gearing.
What is Z in spur gear?
First, you need to define a series of concepts to perform the spur gear calculations: The number of teeth (z). This value is: z = d/m. Ratio between the pitch circle in millimeters and the number of teeth.
How are spur gears manufactured?
Most spur gears and helical gears are manufactured with the help of cutting. Yet, there are many other methods like casting, rolling and forging. In the case of plastic spur gears, in addition to tooth cutting such as with metal gears, injection molding is used depending on the quantity of production.
Who invented spur gear?
Herman Pfauter
Various other patents followed until 1897 when Herman Pfauter of Germany invented the first hobbing machine capable of cutting both spur and helical gears. Through the 20th century, various types of machines developed.
Where can you find spur gears?
Examples of high-speed applications that use spur gears – despite their high noise levels – include consumer appliances such as washing machines and blenders. And while noise limits the use of spur gears in passenger automobiles, they are often used in aircraft engines, trains, and even bicycles.
Which gearbox is used in spur gears?
Spur gears are used in mechanical applications to increase or decrease the speed of a device or multiply torque by transmitting motion and power from one shaft to another through a series of mated gears.
What is circular pitch?
Pitch measurements Circular Circular pitch is the distance from a point on one tooth to the corresponding point on the next tooth measured along the pitch circle as shown in Figure 57.32. Its value is equal to the circumference of the pitch circle divided by the number of teeth in the gear.
Which machine is used to cut gears?
A gear shaper is a type of gear cutting machine. When cutting cylindrical gears such as helical gears and spur gears, cutting of the teeth on the workpiece is performed by hobbing with a rotating hob (see Fig. 2) or gear shaping with a reciprocating pinion cutter (see Fig. 3).
What material is gear manufacturing?
Common Materials Used in Gear Manufacturing There’s an endless number of different materials that can be used to create gears, but as a general rule, cast iron, steel, brass, bronze and plastic are the most common materials used for gears with cut teeth.
What does MOD mean in gears?
“Module” is the unit of size that indicates how big or small a gear is. It is the ratio of the reference diameter of the gear divided by the number of teeth. Thus: (Module = Reference diameter.
Where can spur gears be used?
Spur gears are used for a wide range of speed ratios in a variety of mechanical applications, such as clocks, electric screwdrivers, pumps, watering systems, material handling equipment, power plant machinery, and clothes washing and drying machines.
What are the advantages of spur gears?
Spur gears have high transmission capacity with high efficiency.
How to spur gears are used?
Spur gears are used in mechanical applications to increase or decrease the speed of a device or multiply torque by transmitting motion and power from one shaft to another through a series of mated gears. The design and construction of a spur gear significantly influence its performance.
What is an example of spur gear?
Spur gears are generally seen as best for applications that require speed reduction and torque multiplication, such as ball mills and crushing equipment. Examples of high-speed applications that use spur gears – despite their high noise levels – include consumer appliances such as washing machines and blenders .