Toy Gearbox Line: Backlash, Grease and Run-In

How a toy gearbox line is specified

The number of gear stages, the plastic, the motor and the acceptable noise level decide the line. A single-stage box can be stacked by hand into a fixture; a four-stage box needs station-by-station stacking with a check after each stage.

Station sequence

Housing feeding, gear stacking stage by stage, shaft insertion, grease dispensing, cover fitting, then a run-in test that measures current and noise. The run-in test is the only station that catches a box that turns freely but sounds wrong.

What decides reject rate

• Grease weight: too much drags the motor and raises current, too little wears the teeth in the field. Dispensing by weight, not by time, holds it.
• Axial float: a gear that floats 0.1 mm extra changes the mesh and the noise.
• Cover snap fit: a cover that seats at an angle passes a push test and comes apart in a drop test.
• Run-in current: state a window, not a maximum, because a dry box draws low current and still fails.

What we need from you

• Gearbox drawing with the gear train and the shaft positions
• Plastic grade and the motor specification
• Grease type and the weight per box
• Noise limit, current window, output per shift

How the project runs

Quote from drawing, tooling design, build, then run-off with your own parts in our plant in Chashan. Machines are built to your samples and drawings, and the drawing set is agreed before metal is cut.

Send a drawing to [email protected] or call +86-18123647785 to start a quote. Related lines: blower wheel assembly machines, bearing assembly machines.