Motor Cooling Device Using Rotational Oil Pressurization
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Solution Overview
Problem
Existing motor cooling devices that rely on a center hole in the shaft are ineffective in cooling rotors without such a hole, as they cannot sufficiently supply cooling oil to the rotor.
Innovation Solution
A motor cooling device comprising an annular member and an oil catch unit with a groove-shaped cross-section, where the annular member rotates to pressurize and spout cooling oil from an oil spout hole toward the rotor, efficiently cooling the rotor even without a center hole, utilizing components like an L-shaped section member and a pipe to direct oil into axial cooling channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a center hole is provided in the shaft to supply cooling oil, then cooling effectiveness is improved, but structural integrity and manufacturing complexity worsen
Solution Approach 1:
The invention transitions from radial cooling (through shaft center hole) to axial cooling (from rotor end surface). The oil catch unit is positioned at the rotor end to supply cooling oil axially into cooling channels, eliminating the need for radial shaft penetration while achieving effective rotor cooling.
Solution Approach 2:
The cooling oil supply function is extracted from the shaft structure and relocated to the rotor end surface. The oil catch unit captures cooling oil from the housing and directs it axially into the rotor's cooling channels, separating the cooling function from the shaft's structural role.
2Adaptability or versatility
If cooling oil is supplied axially to the rotor, then compatibility with solid shafts is improved, but oil supply pressure and flow control worsen
Solution Approach 1:
The oil catch unit acts as an intermediary between the cooling oil reservoir in the housing and the rotor's cooling channels. It captures, stores, and pressurizes the cooling oil before directing it axially into the rotor, enabling effective cooling without requiring shaft modifications.
Solution Approach 2:
The oil catch unit utilizes the rotational motion of the rotor to dynamically pressurize cooling oil. As the rotor rotates, centrifugal force and dynamic pressure build-up in the oil catch unit force cooling oil through the oil spout hole into the cooling channels, providing adaptive pressure control.
3Quantity of substance
If the oil catch unit extends backward in rotation direction, then oil collection efficiency is improved, but device complexity increases
Solution Approach 1:
The oil catch unit merges multiple functions into a single integrated structure: it combines the oil collection groove, pressurization chamber, and oil delivery mechanism (including oil spout hole and closure plate) into one compact component mounted on the rotor end surface.
Solution Approach 2:
The oil catch unit utilizes curved and arc-shaped geometries to optimize oil collection. The groove-shaped cross-section and arc-shaped extension backward in the rotation direction create effective oil capture zones that leverage centrifugal forces and flow patterns.
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
The device effectively cools the rotor by pressurizing and directing cooling oil into the rotor's cooling channels, ensuring efficient heat dissipation and allowing for motor downsizing without compromising rotation angle detection accuracy.
Implementation Method 1
The oil catch unit extends from a lower side of the annular member in a direction of gravity toward a backward side in a rotation direction of the annular member so as to form an arc shape. The protrusion is provided on the outer circumferential surface of the annular member, and is configured to move inside the groove of the oil catch unit toward the closure plate, on a radially inner side of the closure plate, when the annular member rotates with the shaft.
Implementation Method 2
cooling oil collected in the oil catch unit is pressurized by being pressed toward the closure plate by the protrusion of the annular member, and is then spouted from the oil spout hole toward the rotor of the motor to thereby cool the rotor
Data Source
AI summary
A motor cooling device includes an annular member that rotates with a shaft of a motor, and an oil catch unit that has a groove-shaped cross-section and is disposed along an outer circumference of the annular member, with a groove of the oil catch unit facing an outer circumferential surface of the annular member. The oil catch unit extends toward a backward side in a rotation direction of the annular member so as to form an arc shape, and includes a closure plate that covers the groove at an end in a circumferential direction located on a forward side in the rotation direction, and an oil spout hole that is bored near the closure plate. The annular member includes a protrusion that is provided on the outer circumferential surface of the annular member and that moves toward the closure plate when the annular member rotates with the shaft.