How do you design a spur gear?

The simplest and the easiest type of gear is the spur gear. The spur gear transmits power and motion between parallel shafts and it is widely used in all common transmission applications. The teeth of gear is parallel to the axis of shaft. The following fig shows a pair of spur gear.

How does a spur gear work?

There are two types of spur gears: external and internal. Two external gears mesh together and rotate in opposite directions. An internal gear’s teeth are cut on the inside surface of their circular form. A smaller external gear sits inside an internal spur gear, and the two or more gears rotate in the same direction.

How are spur gears fitted?

The most common type of gears employed, spur gears are constructed with straight teeth cut or inserted parallel to the gear’s shaft on a circular (i.e., cylindrical) gear body. In mated pairs, these gears employ the parallel axes configuration to transmit motion and power.

Why do we use 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 are the design features of spur gear?

The spur gear is cylindrical and has straight teeth cut parallel to its rotational axis. The tooth size of spur gears is established by the diametrical pitch. Spur-gear design accommodates mostly rolling, rather than sliding, contact of the tooth surfaces and tooth contact occurs along a line parallel to the axis.

What is spur gear design?

Spur gears or straight-cut gears are the simplest type of gear. They consist of a cylinder or disk with teeth projecting radially. Viewing the gear at 90 degrees from the shaft length (side on) the tooth faces are straight and aligned parallel to the axis of rotation.

What material are spur gears made of?

Spur gears can be made from metals such as steel or brass, or from plastics such as nylon or polycarbonate. Gears made of plastic produce less noise, but at the expense of strength and loading capability.

What is spur gear pitch?

Spur Gears. Diametral Pitch System. All stock gears are made in accordance with the diametral pitch system. The diametral pitch of a gear is the number of teeth in the gear for each inch of pitch diameter. Therefore, the diametral pitch determines the size of the gear tooth.

What is module of spur gear?

Also, module is defined as the pitch diameter divided by the number of teeth, and the distance from the pitch circle to the outside circle (addendum) is equal to the module in spur gears.

What type of steel are spur gears made of?

Stainless steel is a metal alloy commonly used in the casting of spur gears. A metal alloy is a metal composed of two or more distinct elements that are melted together. Like cast iron, it is highly resistant to oxidation, and like acetal, it is resistant to abrasions and other weakening blemishes.

What is the difference between a spur gear and a pinion gear?

Spur gears are the most widely used gears that can achieve high accuracy with relatively easy production processes. They have the characteristic of having no load in the axial direction (thrust load). The larger of the meshing pair is called the gear and smaller is called the pinion.

How do I identify a spur gear?

Steps

Count how many teeth a sample spur gear has z =
Measure its tip diameter da =
Estimate an approximation of its module, assuming that it has an unshifted standard full depth tooth, using the equation:
Measure the span measurement of k and the span number of teeth.
This difference represents pb = πm cos α

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 .

What does different spur gear do?

Spur gears provide several benefits to industrial applications and processes, including: Simplicity. Spur gears feature a simple, compact design that makes them easy to design and install, even in limited or restricted spaces. Constant Speed Drive. These gears increase or decrease shaft speed with a high degree of precision at a constant velocity. Reliability. Cost-Effectiveness. Efficiency.

What does spur gear mean?

Definition of spur gear. : a gear wheel with radial teeth parallel to its axis. — called also spur wheel.