Product Overview
Plastic Timing Gears are direct-meshing gears that maintain a defined angular relationship between two shafts; they are not toothed-belt pulleys. They are used in small motor timing systems, sensor mechanisms, and positioning assemblies where the output must follow the input at a fixed ratio and phase.
Key Advantages
Defined Phase Relationship Between Shafts
The tooth-count relationship fixes the transmission ratio and keeps the intended phase between input and output. This is used in mechanisms that must reach a repeatable angular position rather than only transmit continuous rotation.
Assembly Datums Linked to a Tooth Position
A shaft flat, index mark, or sensor feature can be tied to a specific tooth. The gear can then enter the assembly at the intended phase without a separate alignment component.
Controlled Accuracy Through Reversal
Backlash is set with the mating pair and center distance. During reversal, the controlled clearance limits angular lost motion without creating a tight mesh.
Product Parameters
|
Parameter |
Value |
|
Product Name |
Plastic Timing Gears |
|
Available Materials |
POM, PA6 |
|
Gear Precision Grade |
Grade 8 – 11 |
|
Angular Backlash |
≤0.5° (typical) |
|
MOQ |
10,000 pcs (mixed allowed) |
Customization Capabilities
The pair is developed from the timing diagram, with ratio and phase reference defined before the tooth and bore geometry. An index mark or sensor feature can be linked to a specific tooth position.
Backlash and shaft fit are set for the required reversal accuracy and temperature range. This scope covers direct gear-to-gear timing; toothed-belt pulleys require a separate tooth profile.
Quality Control
First-piece inspection checks tooth spacing and the angular relationship between the bore datum and the phase reference. The mating pair is then assembled at the approved center distance.
Functional verification compares input and output angle through the required travel. Reversal is included where angular lost motion affects the mechanism.
FAQ
Q: What is the standard payment term?
A: Full prepayment is the standard term. The quotation identifies tooling, samples, production parts, inspection, and freight separately when applicable.
Q: What is the normal production lead time?
A: Production lead time depends on the quantity and production plan. Repeat orders normally have a shorter schedule after the mold and process are approved.
Q: Is a plastic timing gear the same as a timing-belt pulley?
A: No. This product uses direct gear-to-gear engagement. A toothed-belt pulley has a belt-specific tooth profile and must be developed as a separate component.
Q: What environmental data is needed for material selection?
A: Provide minimum and maximum temperature, contact with grease, oil, fuel, cleaners, or moisture, duty cycle, storage condition, and the permitted dimensional change.
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