Rotary Impact Tool Spindle Segmentation for Common Use
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Solution Overview
Problem
Existing rotary impact tools with a double hammer structure face challenges in using a spindle member in common across different types of tools, leading to increased manufacturing and development costs.
Innovation Solution
A rotary impact tool design that includes a driving unit, a spindle, an anvil, a primary hammer, a secondary hammer, a cam structure with steel balls, and a retaining member that supports the secondary hammer, allowing the spindle member to be used in common across different tools without modification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a double hammer structure is employed in a rotary impact tool, then the magnitude of impact in the rotational direction is maintained while the magnitude of impact in the direction of the line of rotational axis is reduced, but the spindle member cannot be used in common across different types of tools, leading to increased manufacturing and development costs
Solution Approach 1:
The spindle assembly is segmented into two independent parts: the spindle member (which rotates) and the retaining member (which is stationary). This segmentation allows the spindle member to be standardized and used across different tool types, while the retaining member can be customized for specific applications. The spindle member includes guidance grooves and engagement grooves with steel balls, while the retaining member has a retaining groove and mounting groove, enabling modular design and interchangeability.
2Ease of manufacture
If the spindle member structure is modified to enable common use across different tools, then the manufacturing cost is reduced, but the structural complexity of the spindle assembly increases
Solution Approach 1:
The spindle member is designed with universal features including guidance grooves and engagement grooves with steel balls that can be used across different rotary impact tool types. This universal design allows the same spindle member to be interchanged between various tools, reducing manufacturing costs through standardization while maintaining the necessary functional complexity through the retaining member.
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
Enables the use of a common spindle member across various tools, reducing manufacturing and development costs while maintaining the effectiveness of the rotary impact mechanism.
Implementation Method 1
a cam structure in which at least one steel ball is disposed between a guidance groove of the spindle and an engagement groove of the primary hammer
Implementation Method 2
A slide bearing that receives a load in the radial direction relative to the line of rotational axis of the spindle is provided between the secondary hammer and the spindle
Data Source
AI summary
A secondary hammer support structure in a rotary impact tool is structured such that a plurality of steel balls are disposed between a secondary hammer and a retaining member. The plurality of steel balls are arranged between the first retaining groove of the secondary hammer and the second retaining groove of the retaining member. The retaining member is formed as a member separate from the spindle and has a retaining surface for retaining steel balls and a mounting surface mounted to the spindle so as not be rotatable. The mounting surface of the retaining member is mounted to a front member of a carrier.