Chain-Driven Power Transmission Layout for Compact Parking Gear
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power transmission devices face challenges in reducing size to maximize space in passenger compartments, particularly in electric vehicles, while ensuring a high degree of freedom in the layout of parking mechanisms.
Innovation Solution
A power transmission device design featuring a drive sprocket, driven sprocket, and an endless flexible member, with a parking gear positioned at the drive source's output shaft, allowing for compact arrangement and interference-free parking mechanism layout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a parking mechanism is disposed inside a chain belt to avoid trajectory, then interference with the endless flexible member is avoided, but the device complexity increases and layout freedom is restricted
Solution Approach 1:
The parking mechanism is extracted from the chain belt interior and relocated to the output shaft of the drive source. This separation removes the parking mechanism from the trajectory avoidance requirement, simplifying its structure while eliminating interference with the endless flexible member through spatial separation.
Solution Approach 2:
The parking mechanism is repositioned from a two-dimensional arrangement within the chain belt to a three-dimensional arrangement at the output shaft. This dimensional change allows the parking mechanism to occupy a different spatial zone, avoiding interference with the endless flexible member's trajectory while reducing structural complexity.
2Volume of moving object
If the power transmission device is reduced in size to maximize passenger compartment space, then vehicle interior space is increased, but the layout freedom of the parking mechanism is restricted
Solution Approach 1:
The parking mechanism is merged with the output shaft structure of the drive source, sharing the same spatial location and structural support. This integration eliminates the need for separate mounting space, allowing compact device sizing while maintaining layout freedom through the unified structure.
Solution Approach 2:
The output shaft structure serves dual functions: transmitting power and supporting the parking mechanism. This multi-functionality reduces the overall device volume by eliminating redundant structural elements, while the standardized output shaft interface maintains layout adaptability.
Data Source
AI summary
A power transmission device includes: a drive source; a transmission portion configured to convert power of the drive source and transmit the power to a driven portion; and a case accommodating the drive source and the transmission portion, in which the power transmission device further comprises a drive sprocket disposed at an output shaft of the drive source, a driven sprocket disposed on the same plane as the drive sprocket, an endless flexible member wound around the drive sprocket and the driven sprocket, and a parking gear disposed at the output shaft of the drive source.