Flow-Welded Saw Spindle Throughbore Without Bushing Welding
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Solution Overview
Problem
The manufacturing process of reciprocating saws is complicated and costly due to the requirement of an expensive and complex welding process for bushings used in spindle connections with wobble plates.
Innovation Solution
A spindle with a throughbore formed via a flow welding process, eliminating the need for bushings by machining a portion of the spindle and using a flow welding process to create a collar and throughbore, which simplifies the manufacturing and ensures compatibility with various drive mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bushing is used to connect the spindle to the wobble plate, then the connection is achieved, but the manufacturing process becomes expensive and complex due to required welding
Solution Approach 1:
The invention merges the bushing component with the spindle by forming an integral throughbore directly in the spindle body. This eliminates the separate bushing part and its associated welding operations, while maintaining the functional connection between the spindle and wobble plate through the formed throughbore.
Solution Approach 2:
The invention extracts and eliminates the bushing component from the assembly by creating a throughbore directly in the spindle. This removes the need for the separate bushing part and simplifies the manufacturing process by eliminating the welding step required to attach the bushing to the spindle.
2Reliability
If a bushing with welding process is used, then the spindle connection is achieved, but the manufacturing cost increases
Solution Approach 1:
The invention combines the spindle and bushing functions into a single integrated component by forming the throughbore directly in the spindle body. This eliminates the need for separate bushing manufacturing and welding operations, reducing manufacturing costs while maintaining connection strength through the integral structure.
3Reliability
If a traditional spindle design with bushing is used, then the connection is provided, but the device complexity increases
Solution Approach 1:
The invention merges the spindle and bushing into a single integrated component with the throughbore formed directly in the spindle. This reduces device complexity by eliminating the separate bushing component and its assembly requirements, while maintaining the necessary connection functionality.
Solution Approach 2:
The invention removes the bushing component from the spindle assembly by forming the throughbore directly in the spindle body. This extraction of the separate bushing part simplifies the overall device structure and reduces complexity while preserving the connection function.
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 approach reduces manufacturing costs and complexity by eliminating the need for bushing welding, enhancing the efficiency and compatibility of the spindle with different drive mechanisms, including both AC and DC powered tools.
Implementation Method 1
the spindle includes a throughbore formed by a flow welding process
Data Source
AI summary
A reciprocating saw includes a housing, a motor positioned within the housing, a drive shaft defining a longitudinal axis, and a spindle positioned substantially within the housing and coupled to a wobble plate. The spindle includes a throughbore formed by a flow welding process, wherein the throughbore extends through the spindle to receive the wobble plate.