CVT Link Actuator Layout to Prevent Shift Shock and Power Cut-Off
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Solution Overview
Problem
Existing continuously variable transmissions generate significant noise, vibration, and impact due to opposite rotation directions of the input gear and output shaft, limiting their application in vehicles.
Innovation Solution
A continuously variable transmission design where the first link shaft and output shaft rotate in the same direction, incorporating an eccentric disk, cam, first link, and one-way clutch, with a shift lever adjusting the shift ratio and a planet gear system to minimize noise and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the input gear and output shaft are configured to have opposite rotation directions to enable forward and reverse rotations, then the transmission can perform both forward and reverse operations, but large noise, vibration, and impact are generated
Solution Approach 1:
The patent inverts the conventional configuration by making the input gear and output shaft rotate in the same direction rather than opposite directions. This is achieved through a specific gear arrangement where the first gear and second gear are both driven by the input shaft, and the second gear drives the output shaft, creating a same-direction rotation system that eliminates noise and vibration while maintaining forward and reverse operation capability through the direction control valve and valve body configuration
2Ease of operation
If the eccentric disk and output shaft rotate in opposite directions, then the link actuator can function, but noise, vibration, and impact are generated particularly during operation
Solution Approach 1:
The patent reverses the rotation direction relationship between the eccentric disk and output shaft by configuring the gear system so that both rotate in the same direction. The first gear driven by the input shaft and the second gear that drives the output shaft are arranged to rotate in the same direction, which in turn makes the eccentric disk and output shaft rotate in the same direction, thereby eliminating the harmful noise and vibration while preserving the link actuator's operational functionality
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
Significantly reduces noise, vibration, and impact, enhances shifting stability, and prevents power cut-off during shifts by ensuring synchronized rotation directions, improving the transmission's operational performance.
Implementation Method 1
a one-way clutch that is provided between the first link and the output shaft and transmits power only in one direction in which the output shaft is rotated
Implementation Method 2
an eccentric disk that eccentrically rotates around the first link shaft, a cam that reciprocates by rotation of the eccentric disk
Data Source
AI summary
The present invention relates to a continuously variable transmission, and more specifically, to a continuously variable transmission that prevents power cut-off when shifting and minimizes a load/impact due to the shifting, and that includes an eccentric disk and an output shaft which rotate in the same direction to prevent noise/vibration/impact that is generated particularly when the eccentric disk that operates a link actuator and the output shaft rotate in opposite directions. According to an embodiment of the present invention, there is provided a continuously variable transmission including: an input shaft 2 that receives power as an input from outside; a planet gear 4 to which a part of the power is transmitted from the input shaft 2; a driven shaft 3 to which a part of the power is transmitted from the input shaft 2; a first link shaft 51 which is rotated with power transmitted from the driven shaft 3; a link actuator that is actuated by rotation of the first link shaft 51; a shift lever 6 that adjusts a shift ratio of the link actuator; and an output shaft 7 to which power is transmitted from the link actuator and the planet gear 4. The link actuator includes an eccentric disk 501 that eccentrically rotates around the first link shaft 51, a cam 502 that reciprocates by rotation of the eccentric disk 501, a first link 504 that is connected to the cam 502 and transmits power to the output shaft 7, and a one-way clutch 506 that is provided between the first link 504 and the output shaft 7 and transmits power only in one direction in which the output shaft is rotated. The first link shaft 51 and the output shaft 7 are driven in the same rotation direction by causing the first link shaft 51 to be rotated by the driven shaft 3.