| HS Code | Official Doc | Tariff Rate | Origin | Destination | Effective Date |
|---|---|---|---|---|---|
| 8708406000 | Doc | 55.0% | CN | US | 2025-05-12 |
| 8708991600 | Doc | 55.0% | CN | US | 2025-05-12 |
| 8714995000 | Doc | 37.5% | CN | US | 2025-05-12 |
| 4303100030 | Doc | 59.0% | CN | US | 2025-05-12 |
| 4303100060 | Doc | 59.0% | CN | US | 2025-05-12 |
| 4304000000 | Doc | 61.5% | CN | US | 2025-05-12 |
Gear Package
A gear package, commonly referred to as a gearbox or speed reducer, is a system of gears used to transfer rotational mechanical power from one part to another, typically to alter speed and torque. They are fundamental components in a wide array of machinery.
Material
Gear packages are constructed from a variety of materials, selected based on load, speed, precision, and cost requirements. Common materials include:
- Steel: The most common material due to its high strength and durability. Alloy steels (e.g., carbon steel, stainless steel) are frequently used for improved properties.
- Cast Iron: Used in lower-load applications due to its good damping characteristics and machinability.
- Aluminum: Employed in lightweight applications where weight is a critical factor.
- Plastic: Used in low-torque, low-cost applications, often in consumer products. Engineering plastics like nylon and Delrin are common.
- Bronze: Used for worm gears due to its low friction characteristics and wear resistance.
Purpose
The primary purposes of a gear package are:
- Speed Reduction: Lowering the rotational speed of a motor or engine while increasing torque.
- Speed Increase: Increasing the rotational speed while decreasing torque.
- Torque Multiplication: Increasing the output torque.
- Change Rotational Direction: Reversing the direction of rotation.
- Power Transmission: Transferring power between shafts that are not co-axial.
- Precise Positioning: Providing accurate and controlled movement in applications like robotics.
Function
Gear packages function based on the principles of gear meshing. The input shaft drives a series of gears, which transmit power to the output shaft. The ratio of the number of teeth on the input and output gears determines the speed and torque relationship. The efficiency of a gear package is influenced by factors like lubrication, gear type, and bearing quality.
Usage Scenarios
Gear packages are ubiquitous in numerous applications:
- Automotive: Transmissions, differentials, and wheel drives.
- Industrial Machinery: Conveyor systems, pumps, compressors, mixers, and machine tools.
- Robotics: Actuators and precise motion control systems.
- Wind Turbines: Increasing the rotational speed of the generator.
- Power Generation: Turbine gearboxes.
- Elevators & Escalators: Providing controlled lifting and movement.
- Household Appliances: Washing machines, dryers, and blenders.
Common Types
- Spur Gear: Simplest type, with teeth parallel to the shaft axis. Suitable for moderate speeds and loads.
- Helical Gear: Teeth are angled, providing smoother operation and higher load capacity. Generates axial thrust.
- Bevel Gear: Used to transmit power between shafts that are not parallel.
- Worm Gear: High reduction ratios, self-locking capability, but lower efficiency.
- Planetary Gear: Compact design, high torque capacity, and high efficiency. Often used in automatic transmissions.
- Rack and Pinion: Converts rotational motion to linear motion.
- Harmonic Drive: Extremely high reduction ratios, precision, and compact size. Used in robotics and aerospace.
Based on the provided information, “gear package” can be classified under the following HS codes:
- 8708406000: Parts and accessories of the motor vehicles of headings 8701 to 8705: Gear boxes and parts thereof: Parts: Of tractors suitable for agricultural use. This code specifically covers parts of gear boxes intended for tractors used in agriculture.
- 8708991600: Parts and accessories of the motor vehicles of headings 8701 to 8705: Other parts and accessories: Other: Parts of tractors suitable for agricultural use: Other parts for power trains. This code includes other parts for power trains of tractors suitable for agricultural use. Given that a gear package is a component of a power train, this could be applicable.
The total tax rate for both 8708406000 and 8708991600 is 55.0%, comprised of a 0.0% base tariff, a 25.0% additional tariff, and a 30% additional tariff effective after April 2, 2025.
According to the provided reference material, the HS code options related to 'gear package' are limited, with only the following 2 found.