Harmonic reducerLH series LHD

Harmonic reducerLH series LHD
Model：LHD/14/ 17/20/25/32
Deceleration：50~100 ratio
Rated tonque at 2000/min input ：3.7~96Nm
Pemissble peak ooe at t and stop：12~ 233Nm
Perminsble maximum valefor averagr loadtorgue:4.8~151Nm

Harmonic drive was invented by American inventor C.Walt Musser inmid-1950s

1. Composition of harmonic gearbox
harmonic gearbox has three basic components: a wave generator, a flexspline and a circular spline.
Wave generator: it is made up of a ball bearing and an elliptical cam. The wave generator is usually attached to the input end, the inner ring of the
bearing is fixed around the cam causing the outer ring of the bearing deforms to an elliptical shape.
Fexspline: it is an elastic thin-walled component with gear teeth on outer surface. It is usually fitted to output end.
Circular spline: it is a rigid steel ring with internal teeth. It usually has two more teeth than the flexspline, and generally mounted onto a housing.
2. Principle of harmonic gearbox
As a reducer, the harmonic gearbox is often in a status as: the wave generator drives, the circular spline is fixed, the flexspline is output end.
When the wave generator is put inside of the flexspline, the flexspline is forced into an elliptical shape causing the flexspline teeth to engage with the
tooth profile of the circular spline along the major axis of the ellipse, with the teeth completely disengaged across the minor axis of the ellipse.
The rotation of the wave generator makes the flexspline deform continuously, the teeth change operating state in the process of engagement and
disengagement, thus the motion transmission between wave generator and flexspline is realized.
3.Characteristics of harmonic gearbox
1.High accuracy: a good percentage of its teeth are meshed at all times, and are engaged at two zones 180 degrees apart. This means influences of
tooth pitch errors and accumulated pitch errors on rotational accuracy are neutralized, which assures high positional and rotational accuracy.
2.High speed reduction ratio: a harmonic gearbox has high single-stage reduction ratios of 1/30-1/500.Three basic components along same axle
without complex structures can provide high reduction ratios.
into contact with each other and because a good percentage of