Sequential Manual Transmission Clutch Slip for Smooth Shifting
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Solution Overview
Problem
Sequential manual transmissions in motorcycles experience jerky vehicle acceleration during rapid shifting due to incomplete rotational speed synchronization, leading to poor riding and shifting comfort, and existing solutions like double clutch transmissions are large and expensive.
Innovation Solution
A method that automatically reduces the maximum transmissible clutch torque between the engine and transmission input shaft during shifting operations in a sequential manual transmission, without fully opening the clutch, allowing for controlled slip to synchronize rotational speeds and maintain rider-required torque, ensuring a smooth gear change.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traction interruption is achieved by opening the clutch completely during shifting, then rotational speed synchronization is improved, but shifting time is lengthened and vehicle traction is interrupted
Solution Approach 1:
The clutch is not opened completely but only partially during the shifting operation. The clutch torque is reduced from its maximum value to a lower value that is still greater than zero, allowing partial torque transmission during the gear change. This partial action enables rotational speed synchronization while maintaining continuous traction and avoiding complete clutch disengagement.
Solution Approach 2:
The clutch torque is dynamically adjusted during the shifting operation based on the synchronization state. The controller continuously monitors the rotational speeds of the engine and transmission input shaft, and automatically varies the clutch torque in real-time to achieve smooth synchronization without complete clutch opening, thereby reducing shifting time while maintaining comfort.
2Ease of operation
If the clutch is opened completely for rotational speed synchronization, then shifting comfort is improved, but vehicle acceleration is interrupted and riding comfort deteriorates
Solution Approach 1:
Instead of completely opening the clutch, the invention applies partial clutch opening where the clutch torque is reduced but remains greater than zero. This allows the clutch to continue transmitting some torque during the shifting operation, preventing vehicle acceleration interruption while still achieving rotational speed synchronization for comfortable shifting.
Solution Approach 2:
The clutch maintains continuous torque transmission throughout the shifting operation by preventing complete disengagement. The clutch torque is continuously adjusted to remain above zero, ensuring uninterrupted torque flow from engine to transmission, which eliminates vehicle acceleration interruptions and maintains riding comfort during gear changes.
3Ease of operation
If double clutch transmission systems are used to eliminate traction force interruption, then shifting comfort is improved, but device size and cost increase
Solution Approach 1:
The single clutch in the sequential manual transmission is made multi-functional by enabling it to perform both torque transmission and rotational speed synchronization functions. Through automatic torque reduction control, the same clutch handles both power transmission and synchronization tasks that would traditionally require separate clutches, eliminating the need for a double clutch system and reducing overall system complexity.
Solution Approach 2:
The clutch torque parameter is dynamically changed during the shifting operation to achieve multiple functions. By varying the clutch torque from maximum to a reduced value (but greater than zero) and then back to maximum, the single clutch achieves both torque transmission and rotational speed synchronization, replacing the need for complex double clutch systems.
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
This approach limits vehicle acceleration during shifting, enhancing riding and shifting comfort by maintaining a jolt-free transition and avoiding undesired speed increases, while being more compact and cost-effective than double clutch systems.
Implementation Method 1
The clutch is, in particular, a non-positive clutch such as, for example, a friction clutch, in the case of which slip occurs from a defined, adjustable torque
Data Source
AI summary
A method for carrying out a shifting operation in a sequential manual transmission, in particular a shifting claw transmission, is provided. During the shifting operation, a maximum clutch torque that can be transmitted by a clutch arranged between an engine and a transmission input shaft is automatically reduced without completely disengaging the clutch, and a rider-required drive torque is maintained in a manner which reduces undesired jerking movement of the vehicle due to sudden full clutch actuation.