Impact Tool Angular Positioning Durability
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Solution Overview
Problem
Existing impact tools face challenges in durability of angular positioning devices and impact absorption mechanisms, particularly due to wear from dust and the need for lighter materials that compromise weight reduction and durability.
Innovation Solution
The impact tool design incorporates a lubricant-sealed housing space with a dual-locking angular positioning system using ferrous materials for durability and a shared impact absorption mechanism with multiple elastic elements to distribute impact loads, allowing for lighter nonferrous materials in the tool body while maintaining durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the barrel is formed from ferrous materials to ensure wear resistance, then durability of the angular positioning device is improved, but the weight of the tool body increases
Solution Approach 1:
The invention divides the tool body into different material zones: the barrel and angular positioning device are made from ferrous materials for wear resistance, while other portions of the tool body can use lighter nonferrous materials. This segmentation allows selective application of heavy-duty materials only where wear resistance is critical.
Solution Approach 2:
The invention applies different material properties to different regions of the tool body. Specifically, ferrous materials are used locally in the barrel and angular positioning device where wear resistance is required due to dust exposure, while other areas can use lighter materials to reduce overall weight.
2Ease of operation
If the angular positioning device is disposed in the tip end region of the barrel close to the tool bit, then operability is enhanced, but the device becomes more susceptible to wear from dust
Solution Approach 1:
The invention converts the harmful effect of dust exposure into a design opportunity by using ferrous materials with inherent wear resistance in the angular positioning device. The dust that would normally cause wear is now managed by selecting materials that are naturally resistant to such wear conditions.
Solution Approach 2:
The invention changes the material parameter of the angular positioning device and barrel to ferrous materials, which have superior wear resistance properties compared to nonferrous materials. This parameter change allows the device to withstand the harsh dusty environment while maintaining high operability.
3Device complexity
If a single elastic element is used in the impact absorption mechanism, then the structure is simple, but the durability of the elastic element decreases due to heavy load
Solution Approach 1:
The invention divides the impact absorption function into multiple elastic elements instead of using a single element. This segmentation distributes the impact load across multiple components, reducing the stress on each individual element and thereby improving durability while maintaining relatively simple overall structure.
Solution Approach 2:
The invention combines multiple elastic elements to work together in the impact absorption mechanism. By merging their load-bearing capacities, the system achieves improved durability and load distribution without creating excessive structural complexity.
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 design enhances the durability of angular positioning devices and impact absorption mechanisms, reduces tool weight by using nonferrous materials, and improves operational efficiency by protecting against dust and distributing impact loads effectively.
Implementation Method 1
a lubricant sealed in the housing space... connection between the locking member and the tool body is avoided from being adversely affected by dust during hammering operation and protected by the lubricant sealed in the housing space
Implementation Method 2
an elastic element is subjected to a load of an intermediate element which moves forward together with the striker, and thereby absorbs an impact caused by the striking movement of the striker
Data Source
AI summary
It is an object of the invention to provide a technique which is effective in improving the durability of an angular positioning device of a tool bit and in reducing weight of a tool body in an impact tool. A representative impact tool includes a tool body, a lubricant sealed in the housing space, a driving mechanism, a tool holder, an angular positioning device disposed on a tip end side of the tool body and serves to fix a position of the tool bit around the axis with respect to the tool body. The angular positioning device includes first and second locking members. The first locking member is disposed between the tool body and the tool holder. The second locking member is disposed opposite to the first locking member. One end of the first locking member in the axial direction of the tool bit extends into the housing space of the tool body and is connected to the tool body within the housing space.