Power Transmission Device Compact Layout via Shaft Repositioning
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Solution Overview
Problem
The existing power transmission devices in automotive vehicles face challenges in compact design due to the proximity of the output shaft and gear changer to the input shaft, leading to increased complexity and size.
Innovation Solution
A power transmission device with an input shaft, output shaft, speed change gear pairs, slider members supported by the output shaft, a shifter mechanism, and a non-speed change shaft disposed between the input shaft and the shifter mechanism, allowing for a more compact design by separating the shifter mechanism from the input shaft and reducing the size of the transmitting member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the output shaft and gear changer are disposed in the vicinity of the input shaft, then the power transmission path is shortened, but the device complexity increases and the overall size enlarges
Solution Approach 1:
The patent repositions the non-speed change shaft in the circumferential direction between the input shaft and shifter mechanism, utilizing three-dimensional spatial arrangement to reduce the distance between components without increasing the complexity of the gear changer. This dimensional optimization allows compact layout while maintaining structural simplicity.
2Power
If the gear changer is disposed between the input shaft and the separate member, then power transmission is achieved, but the device size increases
Solution Approach 1:
The patent arranges the non-speed change shaft and speed change shaft in a nested or closely integrated configuration, where the non-speed change shaft is positioned in the circumferential direction within the space occupied by the gear changer assembly. This nesting approach allows power transmission to the separate member without increasing the overall device volume.
3Length of moving object
If the shifter mechanism is positioned close to the input shaft, then the transmitting member size is reduced, but maintenance access becomes difficult
Solution Approach 1:
The patent segments the power transmission system into distinct functional modules: the input shaft with clutch, the gear changer with speed change shaft, and the shifter mechanism with non-speed change shaft positioned separately. This segmentation allows the shifter mechanism to be accessed independently for maintenance while keeping the transmitting members compact through optimized spatial arrangement.
Data Source
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AI summary
A gear changer (20) of a power transmitting device includes an input shaft (60) to which a rotational force is inputted from an engine (E), an output shaft (70) for outputting the rotational force to a rear wheel (14), and a plurality of speed change gear pairs (69) for transmitting the rotational force from the input shaft (60) to the output shaft (70). A slider member (80) for selecting one of the speed change gear pairs (69) to transmit the rotational force from the input shaft (60) to the output shaft (70) is supported by the output shaft (70). Selection of one of the speed change gear pairs (69) is accomplished by moving the slider member (80) in an axial direction by means of a shifter mechanism (82). A pump rotary shaft (100), to which the rotation is transmitted from the input shaft (60), is disposed at a location between the input shaft (60) and the shifter mechanism (82) in a circumferential direction of the output shaft (70).