Pin-Gear Differential Transmission for Precise Speed Reduction
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Solution Overview
Problem
Existing differential transmissions are not suitable for implementing high-precision differential speeds due to structural limitations and complexity, requiring a new concept with a compact structure.
Innovation Solution
A differential transmission design featuring a pin-gear type main body unit with rotatably coupled pins, a high-speed shaft, a low-speed shaft, and a reduction portion, along with a high-speed shaft connection unit, which includes pin-gear or spur-gear type configurations with cycloid or trochoid gear teeth, enabling efficient implementation of high-precision differential speeds in a compact form.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional differential transmission structure is used, then the device can perform differential speed function, but the structure becomes complex and cannot achieve high-precision differential speed
Solution Approach 1:
The differential transmission is divided into modular components: a carrier assembly, a planetary gear assembly, and a pin-gear assembly. Each module performs a specific function and can be independently manufactured and assembled, reducing overall structural complexity while maintaining precision through standardized interfaces and tight tolerances on critical dimensions.
Solution Approach 2:
The planetary gear assembly is nested within the carrier assembly, and the pin-gear assembly is integrated into the planetary gear structure. This nested configuration allows multiple gear stages to occupy minimal space while maintaining precise meshing relationships, enabling high-precision differential speed control without increasing external dimensions or overall complexity.
2Adaptability or versatility
If the number of parts is increased to achieve differential speed, then the differential speed function is improved, but the overall structure becomes complex
Solution Approach 1:
The planetary gear assembly serves multiple functions simultaneously: it provides speed reduction, enables differential motion between input and output shafts, and supports the pin-gear mechanism. The carrier assembly both supports the planetary gears and acts as the output shaft. This multi-functionality reduces the total part count while maintaining full differential speed capability.
Solution Approach 2:
The pin-gear assembly is merged with the planetary gear structure, where the pin-gears are directly mounted on the planetary carrier. This integration eliminates the need for separate mounting mechanisms and reduces the number of independent components. The combination of planetary gear reduction and pin-gear differential action in a single integrated structure achieves versatile differential speed control with minimal parts.
3Volume of moving object
If a compact structure is designed, then the device size is reduced, but the implementation of high-precision differential speed becomes difficult
Solution Approach 1:
The transmission utilizes three-dimensional spatial arrangement of gears in different planes and radial positions. The planetary gears are arranged radially around the input shaft, while the pin-gears extend axially from the planetary carrier. This three-dimensional configuration allows multiple gear stages to be packed into a compact cylindrical volume while maintaining adequate meshing clearances and precise tooth contact patterns necessary for high-precision operation.
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
Enables easy implementation of high-precision differential speeds with a compact structure, reducing back lash, noise, and vibration, while providing flexibility in design and increasing the application range of differential devices.
Implementation Method 1
a pin-gear type main body unit which includes a pin-gear type main body housing in which input or output is performed through a plurality of pins, the plurality of pins being rotatably coupled in a circumferential direction of an outer circumferential surface thereof
Implementation Method 2
a reduction portion provided inside the pin-gear type main body housing and reducing an input speed
Data Source
AI summary
A differential transmission includes a pin-gear type main body unit with a pin-gear type main body housing in which input or output is performed through a plurality of pins rotatably coupled in a circumferential direction of an outer circumferential surface thereof, a high-speed shaft provided at one side of the pin-gear type main body housing and through which input or output of a relatively high speed is performed, a low-speed shaft provided at the other side of the pin-gear type main body housing and through which input or output of a speed that is less than the relatively high speed is performed, and a reduction portion inside the pin-gear type main body housing and reducing an input speed; and a high-speed shaft connection unit connected to the high-speed shaft of the pin-gear type main body unit and through which input or output is performed through the high-speed shaft.