Gear Transmission Layout for Compact PV Drive and Cooler Lubrication
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Solution Overview
Problem
Existing gear transmission systems for photovoltaic power-generating apparatuses are lengthened due to the motor and crankshaft being positioned on opposite sides of the intermediate gear, leading to increased overall length and potential bending moments, and require excessive lubricant, which can result in higher temperatures and reduced cooling performance.
Innovation Solution
A compact gear transmission design where the motor and crankshaft are positioned on the same side of the intermediate gear, allowing for a shorter overall length and reduced lubricant usage by positioning the second gear lower than the axis of the carrier, minimizing the distance between panels and optimizing lubricant distribution to reduce temperature increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the motor and crankshaft are positioned on opposite sides of the intermediate gear, then the gear transmission can be structurally simplified, but the overall length of the device is lengthened
Solution Approach 1:
The patent repositions the motor from the opposite side of the intermediate gear to the same side, utilizing radial spacing rather than axial spacing to avoid interference. This dimensional change allows the crankshaft and motor to coexist without increasing the overall axial length of the device, while maintaining structural simplicity through the intermediate gear configuration.
2Length of moving object
If the motor is positioned on the same side of the intermediate gear as the crankshaft, then the overall length is shortened, but the motor may interfere with the crankshaft position
Solution Approach 1:
The patent resolves potential interference by utilizing the radial dimension rather than the axial dimension for motor placement. The motor is positioned radially outward from the crankshaft axis, allowing both components to occupy the same axial region without physical interference, thus shortening overall length while maintaining operational independence.
Solution Approach 2:
The motor is effectively nested within the radial space already occupied by the gear transmission assembly. By positioning the motor such that its outer periphery does not exceed the outer diameter of the ring gear, the motor is accommodated within the existing structural envelope, avoiding interference with the crankshaft while minimizing overall device dimensions.
3Reliability
If excessive lubricant is used in the gear transmission, then all gears and bearings can be adequately lubricated, but the lubricant temperature increases and cooling performance decreases
Solution Approach 1:
The patent implements differential lubrication by positioning the second gear lower than the carrier axis, creating zones with different lubricant depths. The first gear and bearing receive adequate lubrication through sufficient lubricant depth, while the second gear operates with reduced lubricant depth, minimizing overall lubricant volume and heat generation while maintaining adequate lubrication where critical.
Data Source
AI summary
A gear transmission comprises a crankshaft that eccentrically rotates one of an internal gear and an external gear. A first gear is attached to one end of the crankshaft. A ring gear having internal teeth meshes with the first gear. An intermediate gear meshes with external teeth of the ring gear. A second gear is attached to one end of an output shaft of a motor and meshes with the intermediate gear. The motor and the crankshaft are positioned, relative to the intermediate gear, on the same side in the axial direction of the gear transmission.