Crankshaft Poly-V Pulley
4 week ago
Product details
The crankshaft multi wedge pulley is an important component in the engine, mainly used to transmit the power of the crankshaft and drive the accessory systems (such as the generator, water pump, air conditioning compressor, power steering pump, etc.) to work. The following is a detailed introduction about the crankshaft multi wedge pulley:
1. Basic structure and function
Multi wedge belt pulley: It has multiple parallel wedge-shaped grooves (usually 3-6) on its surface, which are matched with multi wedge belts (Poly-V belts). Compared with traditional V-belts, it can transmit greater torque, reduce slippage, and adapt to high-speed working conditions.
Installation position: Fixed at the front end of the engine crankshaft, connected to other accessory pulleys through a multi wedge belt, forming the transmission system.
Material: Usually cast iron, steel or aluminum alloy are used, which need to have high strength, wear resistance and lightweight characteristics.
2. Main features
Efficient transmission: The contact area between the multi ribbed belt and the pulley is large, resulting in high transmission efficiency and suitable for the high-power requirements of modern engines.
Compact design: The multi wedge pulley structure is compact and can drive multiple accessories in a limited space.
Shock absorption and noise reduction: Some pulleys are equipped with integrated shock absorption structures (such as rubber damping layers) to reduce the impact of crankshaft torsional vibration on the accessory system.
Lightweight: Aluminum alloy wheels can reduce the weight of the front end of the engine and lower energy consumption.
3. Common types
Fixed pulley: directly fixed on the crankshaft, without buffering function, simple structure.
Shock absorber pulley (OAD):
One way clutch type (OWC): allows the pulley to rotate freely in one direction, reducing the inertial impact during engine deceleration.
Damping type: Equipped with rubber or spring damping elements to absorb crankshaft vibration.
Combination pulley: Integrated crankshaft position signal ring gear, used for engine speed monitoring.
4. Common faults and maintenance
Wear and tear: The wear of wedge-shaped grooves can cause the belt to slip and make abnormal noises. It is necessary to regularly check whether the groove shape is intact.
Misalignment: Misalignment of the pulley installation can cause uneven wear of the belt, and it is necessary to ensure alignment with other accessory pulleys.
Shock absorption failure: The damping pulley rubber loses its shock absorption effect after aging and needs to be replaced.
Loose bolts: Loose fixing bolts may cause the pulley to fall off, and it needs to be tightened according to torque specifications.
5. Key points for replacement and installation
Dismantling the old pulley:
Use specialized pulling tools to avoid damaging the crankshaft by knocking.
Check if the front end journal and keyway of the crankshaft are damaged.
Install new pulley:
Clean the installation surface to ensure no oil stains or burrs.
Tighten the fixing bolts according to the manufacturer's specified torque (some models require angle tightening method).
Check the radial/axial runout of the pulley (usually requiring<0.1mm).
Belt installation:
Use the correct specification of the multi wedge belt to ensure that all pulley grooves are aligned.
Adjust the tensioner to the specified tension (either too tight or too loose will affect its lifespan).
6. Technological development trends
Integration: Integrate with torsional dampers, signal wheels, and other functions to reduce the number of parts.
Electrification: In hybrid/electric vehicle models, some accessories are driven by motors, and the pulley system may be simplified.
New materials: Carbon fiber or composite material pulleys further reduce weight.
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Jienuo Import and Export Trade Co., Ltd
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5 month
Main Product:
truck engine part,
truck Transmission part ,
truck electrical part,
truck Braking part,
truck steering part,
truck body part
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