Boom Motor Nesting for Impact Protection
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Solution Overview
Problem
In work machines like electric excavators, the electric motor in the boom is exposed, making it susceptible to impacts, which compromises its reliability.
Innovation Solution
The electric motor is positioned within the boom's internal space, surrounded by lateral plates and a bottom plate, protecting it from external impacts and enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the electric motor is exposed outside the boom, then it is easy to access and maintain, but it is susceptible to external impacts and reduces reliability
Solution Approach 1:
The electric motor is nested within the boom structure, specifically positioned inside the space formed by the pair of lateral plates and the bottom plate. This nesting approach protects the motor from external impacts while integrating it into the existing boom structure, resolving the contradiction between accessibility and protection.
Solution Approach 2:
The boom structure with lateral plates and bottom plate acts as a protective shell enclosing the electric motor. This shell provides impact protection while maintaining the structural integrity of the boom, addressing the reliability concern without compromising the motor's functional access.
2Reliability
If the electric motor is placed inside the boom, then it is protected from impact, but it reduces the internal space available for other components
Solution Approach 1:
The electric motor is positioned in the space between the lateral plates along the longitudinal axis of the boom, utilizing the length dimension of the boom. This dimensional arrangement allows the motor to be protected within the boom structure without significantly reducing the cross-sectional area available for other components like hydraulic lines and cables.
Solution Approach 2:
The boom internal space is segmented into different functional zones: the electric motor occupies one section while other components such as hydraulic lines, cables, and structural elements occupy adjacent sections. This segmentation allows multiple components to coexist within the boom's internal volume without excessive space consumption.
3Temperature
If the electric motor is exposed outside the boom, then it dissipates heat more effectively, but it is vulnerable to environmental damage and impact
Solution Approach 1:
The boom structure with its lateral plates and bottom plate serves as an intermediary between the electric motor and the external environment. This intermediary structure provides mechanical protection from impacts and environmental damage while allowing thermal energy to dissipate through the boom's structural material, thus resolving the contradiction between heat dissipation and environmental protection.
Data Source
AI summary
The invention includes a vehicle main body, a boom, a first actuator connecting the boom and the vehicle main body and configured to rotate the boom with respect to the vehicle main body about a first central axis, a first electric motor connected to the first actuator and that operates the first actuator. The boom includes a pair of boom lateral plates disposed to face each other in a direction of the first central axis, and a boom bottom plate connecting the boom lateral plates to each other, the first electric motor being disposed in a boom internal space surrounded by the pair of boom lateral plates and the boom bottom plate.