Product Overview
A Small Plastic Spur Gear is a straight-tooth component for transmitting motion between parallel shafts. It is used as a pinion or intermediate gear in micro motors, door locks, timers, instruments, and compact actuators where the gear stage must fit close to bearings and enclosure walls.
Key Advantages
Direct Straight-Tooth Transmission
Tooth load passes between parallel shafts without the angled contact found in a helical gear. In a housing designed for a conventional spur stage, the resulting mesh is direct and predictable.
No Axial Thrust from the Tooth Form
Straight teeth act in the transverse plane and do not create the axial thrust of a helical mesh. Shaft retention is simpler in small housings, and the gear stays stable along the axis.
Compact Positive Shaft Connection
A D-shaped bore or another positive drive interface transfers torque without a separate key. This preserves usable hub thickness where gear diameter and surrounding clearance are limited.
Technical Data Table
|
Parameter |
Value |
|
Outer Diameter |
10 mm |
|
Number of Teeth |
20 teeth |
|
Center Hole |
3 mm with flat |
|
Material |
Nylon 66 |
|
Tooth Width |
0.5 mm top |
Customization Capabilities
The required ratio and the micro drive's limited center distance set the gear size. Tooth count, module, and face width are balanced against the minimum practical hub and wall thickness.
The bore can match a round shaft, D-flat, or small insert. Resin selection follows the actual speed and impact condition. The scope is limited to straight-tooth spur designs.
Quality Control
First-piece inspection measures the relationship between the bore and tooth circle, together with tooth thickness at the working profile. These dimensions prevent alternating tight and loose mesh as the gear rotates.
A low-torque fixture with the mating spur gear checks smooth rotation, consistent backlash, and the absence of local tight spots.
FAQ
Q: What is the standard payment term?
A: Full prepayment is the standard payment term. Pricing is based on material, mold structure, cavity count, annual quantity, and inspection level.
Q: Which shipping terms are available?
A: EXW and FOB are available. Small compartment bags, trays, or layered cartons can be used to protect the tooth tips.
Q: Can a 3D-printed gear be used for approval?
A: A printed gear can confirm installation space, shaft fit, and assembly access. Final approval of tooth contact, wear, shrinkage, and torque requires an injection-molded sample in the production resin.
Q: How is the minimum tooth count determined?
A: Module, pressure angle, ratio, center distance, and the permitted profile shift are used to calculate the minimum tooth count. Supplying the mating gear and target ratio allows the count to be set without undercut or interference.
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