Product Overview
A Plastic Helical Gear uses angled teeth to transmit motion between parallel shafts with progressive engagement. It is used in mirror motors, window drives, seat mechanisms, HVAC actuators, and compact gearboxes where torque transfer needs to be smoother than in a comparable straight-tooth stage.
Key Advantages
Progressive Tooth Engagement
Contact starts at one side of the tooth and travels across the face. This reduces the abrupt engagement pulse that can create clicking or tonal noise inside an enclosed actuator housing.
Load Shared During the Mesh Cycle
More than one tooth can carry load during part of the rotation. The overlap spreads torque across a broader contact area when the mechanism starts, reverses, or reaches a loaded position.
Defined Direction of Axial Thrust
Helix hand and rotation direction determine where the axial force acts. Once that direction is fixed, the shaft shoulder and bearing retention can be placed on the correct side of the gear.
Technical Data Table
|
Parameter |
Value |
|
Tooth Angle |
20 degrees |
|
Outer Diameter |
40 mm |
|
Hub Length |
45 mm |
|
Center Hole |
10 mm with keyway |
|
Material |
POM with glass fiber |
Technical Data Table
|
Parameter |
Value |
|
Tooth Angle |
15 degrees |
|
Material |
POM plastic |
|
Outer Diameter |
20 mm |
|
Inner Hole |
5 mm |
|
Color |
Black |
Customization Capabilities
The helix angle and hand are designed with the mating gear and center distance because they control overlap and axial thrust. The shaft-retention direction is fixed at the same stage.
The hub and bore are adapted to the required mounting method. Material and lubrication are then selected for operating speed, temperature, and the target noise level.
Quality Control
First-piece inspection verifies the correct helix hand and lead, then measures their relationship to the bore datum. Visual inspection focuses on the angled tooth edge, where incomplete fill or flash affects contact first.
A running check with the mating gear measures smooth torque transfer, axial movement, and operating noise at the approved center distance.
FAQ
Q: Can samples be supplied before mass production?
A: Yes. A molded sample can be supplied for assembly, noise, and load evaluation. Custom sample development normally takes about 50 days after the design is released.
Q: What is the minimum order quantity?
A: The standard MOQ is 10,000 pieces. Approved colors or models may be combined within one order.
Q: Can a helical gear directly replace a spur gear?
A: Not as a drop-in substitution. The helix angle changes the mating tooth geometry and creates axial thrust, so the mating gear, center distance, shaft retention, and bearing arrangement must be reviewed together.
Q: How should rotation direction be specified?
A: Mark the viewing direction, input rotation, output rotation, and shaft positions on the assembly drawing. These references determine the required helix hand and thrust direction.
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