Damper Pulley Hub Abrasion Prevention Coating
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Solution Overview
Problem
Existing damper pulley assemblies for vehicles face issues with oil leakage and increased weight due to friction abrasion between the hub and oil seal, which affects noise vibration harshness (NVH) and the lifespan of auxiliary machinery belts.
Innovation Solution
A damper pulley assembly with an abrasion prevention component, featuring an anti-abrasion coating on the hub's exterior circumference surface, formed using thermal spray, plasma spray, or laser cladding, and grooves to prevent separation, combined with a hub ring and pulley configuration to reduce friction and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If an aluminum hub is used to reduce weight, then the weight of the rotational component is reduced, but friction abrasion between the hub and oil seal increases causing oil leakage
Solution Approach 1:
The patent applies a hard coating layer (such as chromium, nickel, or ceramic coating) specifically on the outer peripheral surface of the aluminum hub where the oil seal contacts. This creates a local area with high hardness and low friction coefficients, while the rest of the hub maintains its lightweight aluminum properties. The localized treatment resolves the contradiction by providing wear resistance only where needed without adding overall weight.
Solution Approach 2:
The hub is constructed as a composite structure combining lightweight aluminum base material with a hard coating layer on the surface. This composite approach allows the hub to simultaneously achieve low weight (from aluminum) and high wear resistance (from coating layer), resolving the contradiction between weight reduction and oil seal retention.
2Reliability
If a cast iron hub is used, then durability and resistance to friction abrasion are improved, but the weight of the rotational component increases
Solution Approach 1:
Instead of making the entire hub from heavy cast iron, the patent applies hard coating materials (traditionally used with cast iron) specifically on the contact surface of the aluminum hub. This localized application provides cast-iron-like wear resistance only where the oil seal contacts, while the bulk hub remains lightweight aluminum.
Solution Approach 2:
The patent replaces the mechanical solution of using solid cast iron material throughout the hub with a surface engineering approach (coating/deposition processes). This substitution allows achieving the same wear resistance function with significantly reduced weight by applying protective layers rather than using heavy bulk material.
3Reliability
If the oil seal is pressed tightly against the hub to prevent leakage, then sealing performance is improved, but friction abrasion increases causing the oil seal to separate
Solution Approach 1:
The patent changes the surface parameters (hardness, friction coefficient) of the hub contact surface through coating applications. This parameter modification allows the oil seal to maintain adequate sealing pressure without experiencing excessive friction and wear, thereby extending the oil seal's service life while maintaining sealing performance.
Solution Approach 2:
The patent converts the potentially harmful friction between oil seal and hub into a beneficial low-friction interface by applying specialized coating materials. The coating transforms the aluminum surface into one with friction characteristics similar to cast iron, turning the harmful abrasion effect into a beneficial low-wear condition that extends oil seal life.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents oil leakage and reduces the weight of rotational components by minimizing friction abrasion between the hub and oil seal, thereby enhancing the durability and efficiency of the damper pulley assembly.
Implementation Method 1
The coating component may be formed by an arc using a thermal spray, a plasma spray, or a laser cladding.
Implementation Method 2
The coating component may be formed by an arc using a thermal spray, a plasma spray, or a laser cladding.
Data Source
AI summary
A damper pulley assembly for a vehicle is provided and includes a crank shaft of an engine of the vehicle, a hub that is coupled to the crank shaft and configured to be rotated, a pulley that is coupled to an exterior surface of the hub and configured to be integrally rotated with the hub and an oil seal that is disposed between the hub and an interior of a cylinder block configured to prevent engine oil leakage in the cylinder block. The hub has an abrasion prevention component formed on an exterior circumference surface on which the oil seal is disposed, and the abrasion prevention component prevents separation of the oil seal. Thus, a friction coefficient of a portion where a contact with the oil seal is concentrated is reduced and abrasion of a shaft is reduced by applying an anti-abrasion coating to improve hardness.