Found 6 matching results
(CN → US)
| HS Code | Official Doc | Tariff Rate | Origin | Destination | Effective Date |
|---|---|---|---|---|---|
| 8473408600 | Doc | 55.0% | CN | US | 2025-05-12 |
| 8473509000 | Doc | 55.0% | CN | US | 2025-05-12 |
| 7326908688 | Doc | 82.9% | CN | US | 2025-05-12 |
| 7326908605 | Doc | 82.9% | CN | US | 2025-05-12 |
| 8708406000 | Doc | 55.0% | CN | US | 2025-05-12 |
| 8708991600 | Doc | 55.0% | CN | US | 2025-05-12 |
Shift Assembly
Shift assembly refers to a manufacturing process, specifically a type of mechanical power transmission method, used to convert rotational motion into linear motion and vice versa. It's a fundamental concept in mechanical engineering and is found in a wide range of devices.
Material
Components typically utilize:
- Steel: High strength and durability for shafts, cams, and followers. Alloy steels are common for increased wear resistance.
- Cast Iron: Used for housings and base plates due to its damping properties and machinability.
- Bronze/Brass: Employed for bearings and bushings to reduce friction and wear.
- Polymers/Composites: Increasingly used for followers or cam surfaces in lower-load applications to reduce weight and noise.
- Lubricants: Essential for reducing friction and wear between moving parts; mineral oils, synthetic oils, and greases are common.
Purpose
The primary purpose of shift assembly mechanisms is to:
- Convert Motion: Transform rotary motion into reciprocating linear motion or vice versa.
- Precise Positioning: Achieve accurate and repeatable linear movement.
- Controlled Force Transmission: Transfer force from a rotating power source to a linear output.
- Indexing: Move a component to a specific position and hold it there.
Function
The core function relies on the interaction between a rotating cam and a follower.
- Cam: A shaped rotating element that dictates the follower's motion profile. The cam's shape determines the timing, distance, and velocity of the linear movement.
- Follower: A component that rides on the cam surface, translating the cam's rotation into linear displacement. Different follower types (see below) affect the smoothness and precision of the motion.
- Shaft: The rotating component supporting the cam.
- Bearings: Reduce friction and support the shaft.
- Frame/Housing: Provides structural support and alignment for the entire assembly.
Usage Scenarios
- Internal Combustion Engines: Camshafts control valve timing, crucial for engine operation.
- Automated Machinery: Used in pick-and-place robots, packaging machines, and CNC equipment for precise component positioning.
- Textile Machinery: Controls the movement of needles and other components in weaving and knitting machines.
- Printing Presses: Controls the movement of paper and printing plates.
- Packaging Equipment: Used in filling, sealing, and labeling processes.
- Manufacturing Processes: Used in various automated assembly and material handling systems.
Common Types
- Flat Cam Mechanisms: Simplest type, cam profile is cut into a flat disc. Suitable for lower speeds and less demanding applications.
- Cylindrical Cam Mechanisms: Cam profile is cut into a cylinder. Provides smoother motion and higher speeds compared to flat cams.
- Plate Cam Mechanisms: Cam profile is cut into a plate. Commonly used in indexing mechanisms.
- Drum Cam Mechanisms: Cam profile is cut into a drum. Used for complex motion profiles.
- Roller Follower: Uses a roller to reduce friction and wear. Suitable for higher speeds.
- Knife-Edge Follower: Uses a sharp edge to follow the cam profile. Used for high-speed, low-load applications.
- Spherical Follower: Provides smooth motion and is less sensitive to misalignment.
- Wiper Follower: Used to wipe a surface during rotation.
Based on the provided information, the following HS codes may be relevant to “shift assembly”:
- 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 covers parts of gear boxes used in tractors for agricultural purposes. A shift assembly, if intended for a tractor gearbox, would fall under this classification.
- 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. If the shift assembly is a component of the power train of a tractor, but isn’t specifically a gearbox part, this code applies.
Regarding HS code 8708406000 and 8708991600, these parts are subject to a 25.0%加征关税, which will increase to 30.0% after April 2, 2025. The total tax rate is 55.0%.