AMT Gear Shifting Actuator With Symmetrical Ball Screw Force Balance
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Solution Overview
Problem
The reliability of automatic gear shifting in AMT gearboxes is compromised due to issues like unsuccessful gear engaging and incomplete disengaging, primarily caused by the difficulty in controlling the position of the screw in ball screw transmission systems, leading to unbalanced gear shifting force and poor reliability.
Innovation Solution
A gear selection and shifting actuating mechanism that includes a gear shifting motor, multiple shift blocks, linear driving devices, and shift forks, where the gear shifting screw is connected to a push block, allowing for balanced and reliable gear shifting by eliminating the need for displacement judgment, using a combination of air cylinders and symmetrical ball screw transmission for power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a ball screw transmission system is used to achieve gear selection and shifting functions, then the gear shifting automation is improved, but the reliability deteriorates due to difficulty in controlling screw position and unbalanced gear shifting force
Solution Approach 1:
The patent divides the gear shifting mechanism into multiple independent shift blocks (first shift block, second shift block, etc.) that can operate independently. Each shift block has its own driving mechanism, allowing separate control and operation. This segmentation eliminates the need for a single complex screw transmission system, thereby improving reliability while maintaining automation through individual block control.
Solution Approach 2:
Instead of using a single screw transmission system to drive all shift blocks simultaneously (conventional approach), the patent inverts the control logic by using multiple independent driving mechanisms (air cylinders) to drive each shift block separately. This inversion of the driving approach eliminates the position control difficulties inherent in single-screw systems and achieves more reliable gear shifting.
2Reliability
If multiple shift blocks with linear driving devices are used for gear selection, then the gear shifting reliability is improved, but the device complexity increases
Solution Approach 1:
The patent applies local quality by giving each shift block its own dedicated linear driving device (air cylinder) positioned at specific locations. This localized driving approach ensures that each shift block can be controlled independently with appropriate force, improving reliability. The complexity is managed by standardizing the local components rather than creating a complex centralized control system.
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 solution ensures balanced and reliable gear shifting force, reduces gear selection time, and enhances the overall reliability of the gear shifting process, allowing for smoother vehicle operation with improved transmission efficiency and reduced motor power requirements.
Implementation Method 1
the second transmission gear is fixedly connected to the gear shifting screw, and the gear shifting screw is screwed to the push block
Implementation Method 2
use a ball screw transmission system to achieve the gear selection and shifting functions
Data Source
AI summary
An actuating mechanism includes a gear shifting motor, a first transmission gear, second transmission gears, gear shifting screws, a push block, a shift fork, a shift block and a linear driving device. An output shaft of the gear shifting motor is provided thereon with the first transmission gear engaged with the second transmission gears; the second transmissions gears are fixedly connected to the gear shifting screws; the gear shifting screws are in screw thread connection with the push block provided thereon with a through hole; one end of the shift block is connected to the linear driving device, and the other end is aligned with a groove on the shift fork after inserting into the through hole. The linear driving device corresponding to a shift position drives the shift block; the gear shifting motor drives the first transmission gear; and the second transmission gears drive the gear shifting screws.