Work Machine Housing and Motor Case for Distributed Loads
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Solution Overview
Problem
The concentration of the electric motor and battery loads in a predetermined attachment part leads to increased size and weight of the housing, necessitating enhanced strength and rigidity, which is not efficiently addressed in existing configurations.
Innovation Solution
The motor and battery are arranged side-by-side on the housing's upper surface, with the motor covered by a case fixed to a different part, utilizing a wider first fixing portion and additional second fixing portions for support, and a cover that is openable to protect the battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the electric motor and battery are attached to the housing via a shared attachment member, then the structure is simplified, but the loads are concentrated in a predetermined attachment part requiring enhanced strength and rigidity which increases housing size and weight
Solution Approach 1:
The patent divides the attachment function into separate components: a first attachment member for the motor and a second attachment member for the battery. This segmentation distributes the loads across different attachment points rather than concentrating them at a single shared location, allowing the housing to be lighter while maintaining structural integrity.
Solution Approach 2:
The patent extracts the battery attachment function from the motor attachment structure. By providing a separate second attachment member for the battery, the design removes the load concentration problem that would exist if a single shared attachment member was used for both components.
2Device complexity
If the electric motor and battery are attached to the housing via a shared attachment member, then the structure is simplified, but the loads are concentrated in a predetermined attachment part requiring enhanced strength and rigidity which increases housing size
Solution Approach 1:
The attachment structure is segmented into distinct first and second attachment members positioned at different locations on the housing. This distribution of attachment points allows the housing to maintain its structural requirements without increasing overall volume, as loads are not concentrated at a single critical point.
Solution Approach 2:
The battery attachment function is extracted from the motor attachment structure, allowing the housing to be designed with optimized, location-specific attachment points rather than a single oversized shared attachment structure that would be required to handle both loads simultaneously.
3Strength
If the motor and battery are arranged side-by-side on the housing upper surface with separate attachment members, then load distribution is improved, but the device complexity increases
Solution Approach 1:
While segmentation does increase the number of attachment members, each individual attachment member can be simpler in design than a complex shared structure would require. The first attachment member is optimized for motor attachment and the second for battery attachment, allowing each to be less complex than a universal attachment system.
Solution Approach 2:
The patent applies local quality by providing attachment members with specific characteristics suited to their particular functions. The first attachment member is designed for motor mounting requirements while the second is designed for battery mounting requirements, allowing each to be optimally simple for its specific purpose rather than over-engineered for all purposes.
Data Source
AI summary
A work machine that can achieve size reduction and weight reduction of a housing. The work machine includes a housing, a motor fixed to an upper surface of the housing, a battery connected with the motor, and a blade driven by the motor. The motor is covered by a motor case fixed to the upper surface of the housing. The motor case is fixed to the upper surface of the housing in a different part from the motor.