CVT Stepping Motor Cooling via Drip-Fed Working Fluid
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Solution Overview
Problem
The existing stepping motor cooling systems for belt-type continuously variable transmissions restrict the flexibility in laying out the stepping motor due to the need for it to be disposed within the stored working fluid, limiting space configuration options.
Innovation Solution
A cooling apparatus and method where a pair of primary and secondary pulleys and a forward/backward switching unit are disposed inside a transmission case, with a stepping motor positioned below the switching unit and an inner case surrounding the switching unit's circumference, featuring a dripping hole above the stepping motor to allow working fluid to drip onto it, thus enabling cooling without requiring the motor to be submerged in the fluid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the stepping motor is disposed within the stored working fluid for cooling, then cooling effectiveness is improved, but layout flexibility is restricted
Solution Approach 1:
The invention extracts the stepping motor from the working fluid storage space, allowing it to be disposed in a different location (below the forward/backward switching unit) while still achieving cooling through the dripping hole mechanism that delivers working fluid directly to the motor
Solution Approach 2:
The dripping hole acts as an intermediary structure that transfers working fluid from the storage space to the stepping motor, enabling cooling without direct submersion and thus resolving the contradiction between cooling effectiveness and layout flexibility
2Temperature
If the stepping motor is disposed within the stored working fluid, then cooling is achieved, but space configuration options are limited
Solution Approach 1:
The invention segments the cooling function from the motor housing by introducing a separate dripping hole structure, allowing the motor to be positioned independently from the working fluid storage area while maintaining cooling capability
Solution Approach 2:
The invention changes the cooling approach from three-dimensional submersion to a targeted drip delivery system through the dripping hole, enabling the motor to be positioned in a different spatial dimension (below the switching unit) while still receiving adequate cooling
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
This solution allows for effective cooling of the stepping motor without the need for it to be positioned within the working fluid, enhancing layout flexibility and improving cooling efficiency by ensuring consistent fluid contact.
Implementation Method 1
dropping working fluid drained from the forward/backward switching unit on the stepping motor from a dripping hole formed through the inner case at an inner case's portion directly above the stepping motor
Data Source
AI summary
In a stepping motor cooling apparatus for a belt-type continuously variable transmission, a pair of primary and secondary pulleys are disposed inside a transmission case, and a forward/backward switching unit is disposed coaxially to the primary pulley, furthermore, a stepping motor is disposed below the forward/backward switching unit. An inner case originating from the transmission case surrounds a circumference of the forward/backward switching unit. Through the inner case, a dripping hole is formed at an inner case's portion directly above the stepping motor so that working fluid drained from the forward/backward switching unit can drip on the stepping motor. In order to further improve the cooling effect of the stepping motor, a recess portion is formed immediately below the stepping motor at an upper surface of a valve body disposed under the stepping motor.