Reciprocating Saw Motor-Transmission Layout for Compact Housing
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Solution Overview
Problem
Reciprocating saws have a large overall size due to the internal installation of structures like electric motors and transmission mechanisms, leading to significant vibration and inconvenient operation for users.
Innovation Solution
The design optimizes the use of housing space by arranging the electric motor and support shaft in parallel, with overlapping regions, and incorporates a gearbox and eccentric block mechanism to reduce the size of the first accommodating space, allowing for efficient use of space and reduced tool volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If electric motor and transmission mechanism are installed inside housing, then reciprocating saw can perform cutting function, but overall size becomes large
Solution Approach 1:
The patent positions the support shaft between the first plane and second plane (perpendicular to the winding extension direction), creating a three-dimensional overlapping arrangement where the electric motor and transmission mechanism occupy different spatial dimensions. This dimensional reorganization allows components to coexist in limited space without interfering with each other's function, reducing overall housing volume while maintaining operational capability.
Solution Approach 2:
The transmission mechanism is nested within the spatial envelope defined by the electric motor's winding structure. The support shaft and transmission wheels are arranged to fit within the bounding box of the motor assembly, with the support shaft positioned between the first and second planes that bound the winding in the direction of extension. This nesting approach allows the transmission mechanism to utilize the motor's spatial footprint without requiring additional external space.
2Productivity
If transmission mechanism is installed inside housing, then reciprocating motion can be generated, but accommodating space increases
Solution Approach 1:
The patent utilizes the third dimension by positioning the support shaft between the first plane and second plane (which are perpendicular to the winding extension direction). This creates a vertical stacking arrangement where the transmission mechanism operates in the dimension perpendicular to the motor's primary extension, allowing both components to share the housing volume efficiently without requiring increased accommodating space.
Solution Approach 2:
The electric motor and transmission mechanism are merged into a single integrated assembly where the support shaft serves both the motor (as a structural element between the first and second planes) and the transmission wheels (as a mounting axis). This merging eliminates the need for separate mounting spaces and reduces the total accommodating volume required for both subsystems.
3Volume of stationary object
If winding and support shaft are arranged in parallel with overlapping regions, then space utilization improves, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by specifying that the support shaft is positioned between the first plane and second plane (localizing it within a specific spatial region defined by the winding boundaries). This localized positioning creates a clear assembly sequence where the support shaft is installed in the gap between the planes, and the transmission wheels are mounted on it, simplifying the manufacturing process despite the three-dimensional arrangement.
Data Source
AI summary
A reciprocating saw includes a housing; a motor, disposed in a housing accommodating space and having a winding extending along a first straight direction; a first transmission wheel connected to the motor; and an input shaft driven by the motor to carry out reciprocating motion. The first transmission wheel is fixed in the accommodating space along a support shaft extending along a second straight direction, and is driven by the motor to rotate about a second straight line; the winding includes a first end and a second end along the first straight direction, a first plane perpendicular to the first straight line passes through a first end face of the first end and a second end perpendicular to the first straight line passes through a second end face of the second end; the first plane is parallel with the second plane, and the winding is located between the first plane and the second plane; at least part of the support shaft is located between the first plane and the second plane.