Single Shift Lever Cam Mechanism for Multistage Transmission
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Solution Overview
Problem
The complexity of gear shifting operations in multistage transmissions, requiring simultaneous operation of main and auxiliary transmissions with multiple shift levers, complicates the process and makes it difficult to select arbitrary gear stages, especially with conventional mechanical and electronic control systems.
Innovation Solution
A gear shifting operation device that uses a single shift lever with an H-shaped shift pattern, incorporating a separation mechanism, select operation mechanism, and shift operation mechanism, including a cam mechanism to simplify the operation by separating shift and select operations, allowing direct mechanical shifting of both main and auxiliary transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multistage transmission with auxiliary transmission is employed to increase the number of gear stages, then the number of gear stages is increased, but the gear shifting operation device becomes complex requiring multiple shift levers and simultaneous operation
Solution Approach 1:
The patent combines the operation of main transmission and auxiliary transmission into a single shift lever system. The shift lever integrates both the select operation (for auxiliary transmission) and shift operation (for main transmission) that were previously separated, allowing both transmissions to be controlled simultaneously through one unified operation mechanism.
Solution Approach 2:
The single shift lever performs multiple functions: it controls both the auxiliary transmission selection and the main transmission shifting. This multi-functional design eliminates the need for separate shift levers for each transmission, simplifying the overall operation device while maintaining multistage capability.
2Ease of operation
If multiple shift levers are used to control main and auxiliary transmissions separately, then each transmission can be controlled independently, but the operation becomes complicated and arbitrary gear stage selection becomes difficult
Solution Approach 1:
The patent merges the control of main and auxiliary transmissions into a single shift lever with an H-shaped shift pattern. This unified control mechanism allows the driver to select arbitrary gear stages through intuitive sequential operations without managing multiple independent levers, simplifying the shifting process while maintaining full control capability.
3Ease of operation
If electronic control systems are used to manage multistage transmission shifting, then gear stage selection becomes automated, but manufacturing costs increase and mechanical simplicity is lost
Solution Approach 1:
The shift lever system is designed to be self-sufficient through its mechanical cam mechanism. The cam groove automatically guides the shifting process based on the H-shaped pattern, eliminating the need for external electronic control systems. This mechanical self-service approach reduces manufacturing costs while providing intuitive gear stage selection.
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
Enhances operability by allowing mechanical shifting of main and auxiliary transmissions with a single shift lever, simplifying the control system, reducing complexity, and enabling arbitrary gear stage selection without electronic control, thus lowering manufacturing costs.
Implementation Method 1
a cam mechanism (20) that operates by the select operation, and operates the shift mechanism (30) for auxiliary transmission and the select mechanism (40) for main transmission
Data Source
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AI summary
There is provided a gear shifting method of a multistage transmission in which gear shift of a main transmission and an auxiliary transmission is mechanically operated by operation of one shift lever, and in which operability is enhanced, a gear shifting operation device of the multistage transmission, and a vehicle having the same mounted thereon. The gear shifting operation device is configured to be provided with: a cam mechanism 20 that has a select operation output member 55 and a shift operation output member 56, which are separation mechanisms that separate, into shift operation and select operation for each direction, operation by operation of one shift lever 52 that moves along at least one H-shaped shift pattern 60, a first cam groove 23 that operates by the select operation, and operates a shift mechanism 30 for auxiliary transmission that shifts a shift fork F1 for auxiliary transmission, and a second cam groove that operates a select mechanism 40 that selects a target shift fork F1 or F2 from among the plurality of shift forks F1 and F2 for main transmission; and a shift mechanism 10 for main transmission that operates by the shift operation, and shifts the shift fork F1 or F2 for main transmission selected by the select operation.