Planetary Transmission Gear Shifting Slider Mechanism
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Solution Overview
Problem
Existing transmissions using gear shifts for speed and torque changes suffer from inefficiencies due to noise, wear, and large size, which complicates manufacturing, assembly, and installation.
Innovation Solution
A transmission system utilizing a planetary gear train with a gear shifting slider and guide bar to change the rotation center of the ring gear, allowing for efficient speed and torque adjustments by positioning the slider at different centers, thereby improving gear shifting capability and reducing size requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If spur gears are coupled in multiple stages to generate speed change, then speed change capability is achieved, but noise and wear are caused by friction
Solution Approach 1:
The patent replaces traditional spur gear engagement with a planetary gear mechanism that uses rolling contact between the input gear, ring gear, and output gear. This substitution eliminates sliding friction inherent in spur gears, thereby reducing noise and wear while maintaining speed change capability through the planetary gear train's inherent mechanical advantage.
Solution Approach 2:
The patent introduces a movable guide bar that can dynamically adjust the position of the input gear relative to the ring gear center. This dynamic adjustment capability allows the system to optimize gear engagement and distribute load across multiple planet gears, reducing individual gear wear and minimizing noise through balanced mechanical operation.
2Speed
If spur gears are coupled in multiple stages to generate speed change, then speed change is achieved, but power speed change efficiency is inferior
Solution Approach 1:
The patent replaces inefficient multi-stage spur gear engagement with a single-stage planetary gear system. The planetary configuration provides direct power transmission through synchronized rotation of sun, ring, and planet gears, eliminating the cumulative energy losses associated with multiple sequential gear stages and improving overall power speed change efficiency.
Solution Approach 2:
The patent merges multiple gear functions into a single integrated planetary gear train. By combining the input gear, ring gear, and planet gears into one cohesive mechanism, the system achieves speed change in a single stage rather than through multiple sequential engagements, thereby reducing energy loss and improving power transmission efficiency.
3Speed
If spur gears are coupled in multiple stages, then speed change is achieved, but large size and large installation space are required
Solution Approach 1:
The patent employs a nested planetary gear configuration where the planet gears are positioned within the annular space between the inner input gear and the outer ring gear. This nesting arrangement allows multiple gear elements to occupy the same radial space, dramatically reducing the overall footprint and installation space required compared to extended multi-stage spur gear arrangements.
Solution Approach 2:
The patent transitions from a linear, axial arrangement of multiple spur gear stages to a radial, planar planetary configuration. By utilizing the radial dimension and arranging gears concentrically around a central axis, the system achieves compact packaging that significantly reduces installation space while maintaining speed change functionality.
4Ease of manufacture
If a planetary gear train with movable guide bar is used, then manufacturing and assembly convenience is improved, but device complexity increases
Solution Approach 1:
The patent uses a movable guide bar that can be positioned at different locations along its travel path to achieve different gear ratios. This dynamic positioning mechanism, while adding some complexity, allows for continuous adjustment and optimization of gear engagement, improving manufacturing flexibility and assembly adaptability compared to fixed-configuration gear systems.
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 solution enhances manufacturing and installation convenience while improving speed change efficiency and reducing noise and wear, achieving precise gear ratios and multistage torque transmission.
Implementation Method 1
an input member (132) which includes an input gear (132a) internally contacting one side of the ring gear (131) and rotating the ring gear (131) while being rotated by the power transmitted from the input shaft (110)
Implementation Method 2
an output gear (135) internally contacting the other side of the ring gear (131) and transmitting changed torque and speed to the output shaft (120) while being rotated by the ring gear (131)
Data Source
Figure 1~2
Figure 3~4
Figure 5(a)~5(d)
AI summary
A transmission includes an input shaft, an output shaft receiving power from the input shaft, and a transmission device changing power transmitted from the input shaft to the output shaft, the transmission device including a ring gear, an input member including an input gear which internally contacts one side of the ring gear and rotates the ring gear while being rotated by the power transmitted from the input shaft, and a guide bar passing through a center point A of the input gear and a center point B of the ring gear, a gear shifting slider which has one end coupled to the guide bar to be movable to the center point A of the input gear and the center point B of the ring gear, and the other end coupled to the input shaft and which changes the rotation center of the input gear to change a torque of the ring gear, and an output gear internally contacting the other side of the ring gear, and transmitting a shifted power to the output shaft while being rotated by the ring gear.