Semi-Automatic Transmission Shift Fork Coupling for Fast Assembly
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Solution Overview
Problem
Automated manual transmissions face challenges in simplifying their switching actuation mechanism to reduce manufacturing costs and assembly complexity, while also preventing tilting moments from being transmitted to actuators during gear changes.
Innovation Solution
The implementation of a longitudinal guide within the transmission housing, where shift forks are accommodated for longitudinal displacement, and actuators have axially displaceable rods with coupling geometries that interact with eccentric coupling arms to transfer linear movements, allowing for quick assembly and disassembly and minimizing tilting moment transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional transmission shift unit with integrated actuators is used, then the structure is compact, but the assembly complexity and manufacturing costs increase
Solution Approach 1:
The transmission shift unit is divided into separate modular components: actuators mounted on the cover and shift forks mounted on the housing. This segmentation allows independent manufacturing and assembly of each component, reducing overall assembly complexity while maintaining compact functionality.
Solution Approach 2:
A coupling arm with coupling geometry serves as an intermediary element between the actuator and shift fork. This mediator transmits motion while decoupling the actuator from direct connection to the shift fork, simplifying both components and reducing manufacturing costs.
2Device complexity
If shift forks are directly connected to actuators, then the structure is simplified, but tilting moments are transmitted to the actuators during operation
Solution Approach 1:
The coupling arm acts as a mediator that decouples the actuator from the shift fork, preventing tilting moments from being transmitted to the actuator while maintaining the simplified structure. The coupling geometry allows pure linear motion transmission without moment transfer.
Solution Approach 2:
The coupling arm extracts the function of motion transmission from the direct actuator-shift fork connection, separating the actuation function from the shifting function. This protects the actuator from harmful tilting moments while maintaining structural simplicity.
3Stability of the object's composition
If the transmission shift unit is made as a single integrated component, then assembly is robust, but assembly and disassembly time increases
Solution Approach 1:
The transmission shift unit is segmented into modular components (actuators on cover, shift forks on housing) that can be assembled and disassembled independently. This reduces assembly time while maintaining robust connections through standardized coupling geometries and mounting structures.
Data Source
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AI summary
The invention relates to a semi-automatic transmission (114) for a motor vehicle, said transmission comprising a transmission housing (112) which has a detachable cover (10) on which a transmission shifting unit (26) is located, wherein the transmission shifting unit (26) has actuators (30, 32, 34) for actuating shift forks (120, 122, 124) associated with each of said actuators, and wherein in each case an associated sliding sleeve of the semi-automatic transmission (114) can be displaced coaxially with respect to a transmission shaft by means of each shift fork. According to the invention: a longitudinal guide (110) extending parallel to a longitudinal axis (50) of the semi-automatic transmission (114) is fastened in the transmission housing (112); the at least two shift forks are received on the longitudinal guide (110) in a longitudinally displaceable manner; each shift fork has a coupling arm (132, 134, 136) arranged eccentrically with respect to the longitudinal guide (110); each actuator (30, 32, 34) has an axially displaceable actuating rod (40, 42, 44) having a coupling geometry (62, 64, 66); and each coupling arm (132, 134, 136), when the cover (10) and transmission housing (112) are assembled, cooperates with an associated coupling geometry (62, 64, 66) of an associated actuator in such a way that linear movements of the actuating rods (40, 42, 44) of the actuators can be transmitted to the shift forks (120, 122, 124) in order to displace said shift forks on the longitudinal guide (110).