Electric drive device and electric power steering device for suppressing pressure fluctuations and water penetration
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United States of America Patent
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Aug 13, 2024
Grant Date -
Oct 21, 2021
app pub date -
Jun 12, 2019
filing date -
Jun 14, 2018
priority date (Note) -
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Abstract
On the opposite side to an output of a rotation shaft of an electric motor, a ventilation hole communicating between an electronic control unit (ECU) housing space and an electric motor housing space is formed to an end surface wall of a motor housing separating the respective housing spaces. The ventilation hole has a waterproof ventilation part that suppresses water passing but permits the passage of air and water vapor. This structure eliminated the influence of flying rocks and muddy water from the external environment, and suppresses for a long period of time the internal pressure fluctuation of the ECU housing space and the penetration of water into the housing space. Therefore, the internal pressure fluctuation of the housing space for the ECU and the penetration of water into the housing space for the ECU can be suppressed over a long period of time.
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