Description of SHD Series Harmonic Reducer

The harmonic drive is invented by an American inventor called C. Walt Musser in the mid-1950s, which has a huge impact on the promotion of human scientific and technological civilization.

The TRANS company is harmonic drive manufacture in China. Its SHD series harmonic gears are featured of a large hollow input shaft and a reinforced cross roller bearing that can bear heavy load without any extra support. This series SHD- 2SH speed reducer belongs to a simple combined unit with a super flat shape and hollow structure. The TRANS company designs an SHD harmonic gearbox as thin as possible to an extreme which saves the installation space greatly.  All the above outstanding advantages make TRANS SHD harmonic actuators operate in a smooth and high efficient status. Besides, SHD series hollow shaft servo actuators are available in models of 14, 17, 20, 25, 32, 40 with reduction ratios of 50, 100, 160.

The Composition of  Harmonic Drive Gearbox

The TRANS SHD Series zero backlash gearbox is also called harmonic drive reducer which is composed of three basic components: a wave generator, flex spline, and circular spline.

The wave generator is composed of flexible bearing and elliptic cam. And the wave generator is normally installed at the input of the harmonic reducer, while the inner circle of the flexible bearing is fixed on the cam and the outer circle achieves elastic change through the ball to form an ellipse.

Flexspline is the flexible thin-walled elastic parts with outer gear rings, which are usually installed at the output end of the harmonic gear reducer.

A circular Spline is a rigid ring-shaped part with an internal gear ring,  the internal gear ring of which has the same size as that of a flex spline. Usually, it has two more teeth than a flex spline and is fixed on the main body of the speed reducer.