Link Unit Contact Surfaces for Compact Power Tool Transmission
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Solution Overview
Problem
Existing transmission devices for hand-held power tools face challenges in achieving a compact design while effectively generating stroke and reciprocating motions for insert tools, leading to issues with wear and precision in cutting operations.
Innovation Solution
The proposed transmission device incorporates a link unit with multiple contact surfaces and a rotatably mounted rolling element to generate force components for both stroke and reciprocating motions, featuring a compact design with a bearing element that supports the link element and allows for precise motion transfer, enabling a slender tool design and reduced wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a transmission device uses a link unit with multiple contact surfaces to generate both stroke and reciprocating motions, then the tool achieves compact design and reduced wear, but the device complexity increases
Solution Approach 1:
The patent combines both stroke motion and reciprocating motion generation functions into a single link unit with multiple contact surfaces. The output element features a first contact surface for stroke motion and a second contact surface for reciprocating motion, allowing one component to perform multiple functions that would traditionally require separate mechanisms, thereby reducing overall device volume while managing complexity through functional integration
Solution Approach 2:
The link unit is designed as a multi-functional component where the output element serves dual purposes: generating stroke motion through the first contact surface and generating reciprocating motion through the second contact surface. This universal design allows a single component to replace what would traditionally require multiple separate components, achieving compact housing dimensions without proportionally increasing device complexity
2Ease of operation
If the transmission device generates both stroke and reciprocating motions through separate mechanisms, then the motions can be precisely controlled, but the tool design becomes less slender and more complex
Solution Approach 1:
The patent merges the control of stroke motion and reciprocating motion into a single integrated link unit. The output element's first contact surface controls stroke motion while the second contact surface controls reciprocating motion, both within the same component assembly. This integration maintains precise motion control capability while achieving a slender tool design by eliminating the need for separate mechanical subsystems
3Reliability
If the contact surfaces are designed to directly contact the link element, then wear is reduced and precision is maintained, but the manufacturing complexity increases
Solution Approach 1:
The output element is designed with differentiated local qualities: the first contact surface and second contact surface are positioned and oriented differently to serve specific functions. The first contact surface is configured for stroke motion contact while the second contact surface is configured for reciprocating motion contact. This local differentiation allows each surface to be optimized for its specific contact function, improving wear resistance and precision while maintaining manufacturability through focused quality requirements on specific local areas rather than the entire component
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 solution achieves a compact and low-wear design for hand-held power tools, ensuring precise cutting results by staggering the reciprocating and stroke motions, thus enhancing the tool's operational efficiency and durability.
Implementation Method 1
The link unit (16) has at least one rolling element (58), which forms at least a portion of the at least one contact surface (20) and which, advantageously, contacts the at least one link element (22)
Data Source
AI summary
A transmission device is configured to generate at least one of a stroke motion and a reciprocating motion of an insert tool of a hand-held power tool, and includes at least one link unit configured to generate the stroke motion. The link unit includes at least one output element, at least one link element, at least one contact surface, and at least one further contact surface. The at least one contact surface is disposed at least partially on the at least one output element. The at least one link element is configured to act in combination with the at least one output element via the at least one contact surface. The at least one further contact surface is configured to generate a force that initiates the reciprocating motion, and is disposed at least partially on the at least one output element.