Product Overview
A Plastic Double Gear has two coaxial gear sections molded as one compound part. It connects two stages of a compact gearbox while keeping a fixed speed ratio and angular relationship between the large and small gear sections.
Key Advantages
Fixed Coaxiality and Phase
Both gear sections are formed around the same bore and molding datum. Their centers and angular relationship stay fixed without a press fit or a separate fastener between stages.
Two Ratio Stages on One Shaft Location
The large and small sections transfer motion between adjacent stages while rotating on one axis. This compound layout adds a reduction step without requiring another shaft position.
Controlled Axial Stack in a Narrow Gearbox
The molded part sets the spacing between the two tooth faces. Each section remains aligned with its mating gear even when the housing has little room for washers, spacers, or separate hubs.
Product Parameters
|
Parameter |
Value |
|
Product Name |
Plastic Double Gear |
|
Available Materials |
POM, PA6 |
|
Gear Precision Grade |
Grade 8 – 11 |
|
Number of Teeth (Both Gears) |
12–100 teeth per gear (custom) |
|
MOQ |
10,000 pcs (mixed allowed) |
Customization Capabilities
Each coaxial section is specified as an independent mesh, but both use one bore and one angular reference. This keeps the ratio transition, axial spacing, and phase between stages under control in a single component.
The bore and hub can fit a plain shaft, a positive drive feature, or a metal sleeve. Material and wall thickness are selected to limit distortion across both gear faces.
Quality Control
First-piece inspection checks the concentricity of both gear sections relative to the bore and measures the axial spacing between their working faces. These two relationships control alignment in both stages.
A dual-stage mesh check verifies that both sections rotate without binding and keep the intended phase relationship through the complete gear train.
FAQ
Q: How is the product packaged for export?
A: Double gears can be packed in compartment bags, layered trays, or separated cartons so the two tooth sections do not rub against adjacent parts. The final method depends on part size and shipment route.
Q: What is the minimum order quantity?
A: The standard MOQ is 10,000 pieces, with approved colors or models allowed within one order.
Q: Can a one-piece double gear replace an assembled two-piece gear?
A: Yes, after the torque path, available axial space, phase relationship, bore fit, and molding shrinkage are reviewed. The replacement is approved through sample assembly and load testing.
Q: Can a metal sleeve be added to the bore?
A: Yes. A metal sleeve or bushing can be insert-molded or assembled after molding when the bore needs higher wear resistance, a tighter shaft fit, or greater torque transfer.
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