Impact Wrench Contact Surface Geometry for Uniform Force Transfer
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Solution Overview
Problem
Conventional impact wrenches with oblate-shaped impact contact surfaces suffer from inefficient kinetic energy transmission, uneven stress distribution, and reduced service life due to partial contact impact and wear on the stopping and locking blocks.
Innovation Solution
The impact wrench features an intermeshing arc, cycloid, or logarithmic spiral-shaped contact surface configuration between the stopping and locking blocks, maximizing contact area and evenly distributing collision forces to reduce wear and enhance mechanical efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the impact contact surface is designed with an oblate shape, then the structure is simple to manufacture, but the contact surface area is small leading to insufficient kinetic energy transmission and low mechanical efficiency
Solution Approach 1:
The patent applies curvature by designing the contact surfaces of the stopping block and locking block as arc-shaped or cycloid-shaped surfaces instead of flat oblate surfaces. This curved geometry increases the contact area during impact, improving kinetic energy transmission and mechanical efficiency while maintaining manufacturing feasibility through standard machining processes.
2Ease of manufacture
If the impact contact surface is designed with an oblate shape, then the manufacturing process is simple, but the impact force is partially concentrated leading to uneven stress distribution
Solution Approach 1:
The curved arc-shaped or cycloid-shaped contact surfaces distribute the impact force more uniformly across the contact area. The geometry of the curved surfaces ensures that stress is distributed evenly during collision, preventing localized stress concentration that would occur with flat oblate surfaces.
3Device complexity
If the impact contact surface is designed with an oblate shape, then the structure is simple, but partial wearing or crack formation occurs accelerating, reducing service life
Solution Approach 1:
The curved contact surfaces reduce localized stress concentration and wear by distributing impact forces evenly across the entire contact area. This uniform stress distribution prevents partial wearing and crack formation, thereby extending the service life of the stopping block and locking block while maintaining reasonable structural simplicity.
4Productivity
If the contact surface area is increased through arc or cycloid shapes, then kinetic energy transmission is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent employs arc-shaped or cycloid-shaped contact surfaces that can be manufactured using standard machining processes. These curved geometries provide increased contact area for improved kinetic energy transmission while remaining feasible for conventional manufacturing, balancing precision requirements with production capabilities.
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 configuration enhances mechanical efficiency by maximizing force transmission, reduces wear and tear on the blocks, and extends the service life of the impact wrench by evenly distributing stress and minimizing partial contact impacts.
Implementation Method 1
Upon collision between the stopping block and the locking block, the small contact surface area leads to insufficient transmission of kinetic energy
Implementation Method 2
the first contact surface located on the stopping block to contact and press the locking block and at least one second contact surface located on the locking block to contact and press the first contact surface
Data Source
AI summary
An impact contact surface shape of an impact wrench. The impact wrench comprises a rotary shaft that acts on the workpiece and an impact block sleeved on the rotary shaft to drive the rotary shaft to rotate. One end of the rotary shaft is at least configured with a stopping block to collide with the impact block. The impact block is at least configured with a locking block to collide with the stopping block. The impact contact surface comprises: at least one first contact surface located on the stopping block to contact and press the locking block and at least one second contact surface located on the locking block to contact and press the first contact surface. The first contact surface and the second contact surface are intermeshing arc shapes or cycloid shapes.