Impact Tool Hammer Bearing Alignment
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Solution Overview
Problem
In impact tools, the hammer's inclination relative to the spindle can lead to reduced striking force and wear due to friction, necessitating a solution to maintain the hammer's alignment and prevent axial displacement.
Innovation Solution
The impact tool incorporates a hammer bearing supported by a hammer case, which ensures the hammer remains rotatable and aligned with the spindle, utilizing a ball bearing configuration to prevent inclination and axial displacement, thereby reducing wear and maintaining effective striking force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the hammer is supported directly by the spindle without a hammer bearing, then the structure is simpler, but the hammer rotates in an inclined state causing reduced striking force and increased friction wear
Solution Approach 1:
A hammer bearing is introduced as an intermediary component between the hammer and the spindle. The bearing supports the hammer in a rotatable manner, ensuring the hammer rotates concentrically with the spindle without inclination. This mediator prevents direct contact that would cause friction and wear, while maintaining the necessary rotational support and alignment stability.
2Device complexity
If the hammer is allowed to rotate freely without support, then the structure is simpler, but the hammer displaces in axial direction reducing striking effectiveness
Solution Approach 1:
The hammer bearing serves as a mediator that permits free rotation while preventing axial displacement. The bearing's design allows the hammer to rotate concentrically with the spindle but constrains axial movement, ensuring the hammer remains positioned to deliver effective striking force without unnecessary structural complexity.
3Adaptability or versatility
If the hammer rotates in an inclined state, then the hammer can accommodate misalignment, but friction wear increases and striking force decreases
Solution Approach 1:
The hammer bearing introduces a controlled intermediary interface that eliminates harmful friction wear while maintaining adaptability. The bearing's rotational support allows the hammer to accommodate minor misalignments through concentric rotation, but the bearing itself prevents the inclination that would cause friction and wear between the hammer and spindle.
Solution Approach 2:
The patent replaces direct mechanical contact between the hammer and spindle with a bearing-based support system. This substitution transforms the interaction from high-friction sliding contact to low-friction rotational support, eliminating the harmful friction wear while preserving the ability to accommodate misalignment through controlled rotation.
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 effectively suppresses the hammer's inclination and axial displacement, enhancing the impact tool's performance by maintaining consistent striking force and reducing wear on components.
Implementation Method 1
a hammer bearing that is held by the hammer case and supports the hammer in a rotatable manner
Data Source
AI summary
An impact tool includes a motor; a spindle that is rotated by rotational force of the motor; a tool holding shaft at least a part of which is disposed forward of the spindle; a hammer that is supported by the spindle and impacts the tool holding shaft in a rotation direction without being displaced in the axial direction; a hammer case that houses the hammer; and a hammer bearing that is held by the hammer case and supports the hammer in a rotatable manner.