A spur gear is a cylindrical gear with parallel and coplanar shafts and spur teeth parallel to the output shaft. Spur gears are the simplest and most common type of gear - easy to manufacture and suitable for a wide range of applications.
Our products also include Spur Gears, which are standard spur gears, used for gear transmission; there are also Spline & Gear Shafts, which are a kind of mechanical transmission, with the same functions as flat keys, semicircular keys, and oblique keys; and Worms & Worm Wheels. Worm Gear, worm gear is equivalent to gear, worm is equivalent to rack. The worm is the driving part, and the worm wheel is the driven part; there is also the Sprocket , which is a wheel with cog-type sprocket teeth; and the Helical gears, which is a type of helical gear meshing part. If you want to know more, welcome to consult us, we will serve you wholeheartedly!
The teeth of a spur gear have an involute profile and mesh one tooth at a time. The involute form means that spur gears only generate radial forces (no axial forces), while the meshing method of the teeth results in excessive stress on the teeth and high noise. Therefore, spur gears are usually only used in low speed applications,
The profile of an involute gear tooth is the involute of a circle, and when two gears mesh, they touch at a single point where the involutes intersect. As the gear rotates, the point moves along the flank and the lines of force (called lines of action) are tangent to the two base circles. Therefore, gears obey the basic laws of gearing, which states that the ratio of the angular velocity of the gears must remain constant throughout the mesh.
Spur gears can be made of metal (such as steel or brass) or plastic (such as nylon or polycarbonate). Gears made of plastic produce less noise at the cost of reduced strength and load-carrying capacity. Unlike other gear types, spur gears do not experience high losses from slipping, so they generally have high transmission efficiency. Large reduction ratios can be achieved using multiple spur gears (called gear trains) in series.
The external gear (with teeth on the surface of the cylinder) meshes on the inner surface of the internal gear.
There are two main types of spur gears: external and internal. External gears have teeth cut on the outer surface of the cylinder. The two external gears mesh together and rotate in opposite directions. In contrast, internal gears have teeth cut on the inner surface of the cylinder. The external gear is inside the internal gear, and the gears rotate in the same direction. Because the gear shafts are positioned closer together, the internal gear assembly is more compact than the external gear assembly. Internal gears are mainly used for planetary gear transmission. Spur gears are generally considered the best choice for applications that require speed reduction and torque multiplication, such as ball mills and crushing equipment. Examples of high-speed applications using spur gears include consumer appliances such as washing machines and blenders. While noise limits the use of spur gears in passenger cars, they are often used in aircraft engines, trains and even bicycles.
