Hypoid Gear Surface Finishing for Lower Transmission Loss
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Solution Overview
Problem
The existing methods for manufacturing hypoid gears face challenges in achieving both productivity and motive power transmission efficiency due to striated machining marks from lapping machining, which lead to oil film fracture and reduced mechanical efficiency.
Innovation Solution
A method involving a tooth cutting step, a surface treatment step with a hardened layer, a lapping step using abrasive particles of 14 μm or less, and a shot peening step with particles of 160 μm or less to remove machining marks and improve tooth surface roughness, thereby enhancing lubricant retention and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If lapping machining is performed to improve tooth surface roughness, then surface finish is improved, but striated machining marks are formed that cause oil film fracture and reduce motive power transmission efficiency
Solution Approach 1:
The patent changes the particle diameter parameter of the shot peening process to 160 μm or less, which is sufficiently small to remove striated machining marks but large enough to maintain productivity. This parameter optimization resolves the contradiction by achieving smooth tooth surfaces without the need for multiple lapping steps, thereby preventing oil film fracture while maintaining efficient power transmission.
2Manufacturing precision
If multiple shot peening steps with different particle diameters are used to remove machining marks, then tooth surface quality is improved, but production steps increase and productivity decreases
Solution Approach 1:
The patent optimizes the shot peening particle diameter to 160 μm or less, which enables a single shot peening step to effectively remove striated machining marks. This eliminates the need for multiple sequential shot peening steps with progressively smaller particles, thereby maintaining high productivity while achieving the required tooth surface quality for preventing oil film fracture.
Solution Approach 2:
The patent extracts and eliminates unnecessary production steps by determining that a single shot peening step with optimized particle diameter is sufficient to remove machining marks. This simplifies the manufacturing process by removing redundant operations, thereby improving productivity without compromising tooth surface quality.
3Manufacturing precision
If lapping machining is performed to improve tooth surface roughness, then surface finish is improved, but production time increases
Solution Approach 1:
The patent changes the approach from multiple lapping steps to a single shot peening step with particle diameter of 160 μm or less. This parameter optimization enables effective removal of striated machining marks in one operation, significantly reducing production cycle time while achieving the necessary tooth surface roughness to prevent oil film fracture and maintain power transmission efficiency.
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
This approach significantly reduces motive power transmission loss, achieving a tooth surface roughness of 0.8 μm or less and improving fuel efficiency by maintaining a lubricant film on the tooth surface while simplifying the production process for mass production.
Implementation Method 1
a lapping step of machining the first intermediary body using an abrasive particle having a diameter of 14 μm or less to form a second intermediary body
Implementation Method 2
a shot peening step of spraying a particle having a diameter of 160 μm or less onto the second intermediary body
Implementation Method 3
the hypoid gear has a lubricant film on a gear surface thereof
Data Source
AI summary
A method for manufacturing a hypoid gear includes: a tooth cutting step of machining a shape of a tooth of the hypoid gear; a surface treatment step of forming a third intermediary gear provided with a hardened layer on a surface of the tooth; a lapping step of machining the third intermediary gear using an abrasive particle having a diameter of 14 μm or less to form a fourth intermediary gear; and a shot peening step of spraying a particle having a diameter of 160 μm or less onto the fourth intermediary gear.