Manual Gearbox Shift Actuator With Coupled Mass for Vibration Decoupling
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Solution Overview
Problem
Existing shift mechanisms for manual vehicle transmissions suffer from increased vibrations and acoustic impairments, requiring large installation space, high costs, and excessive weight, which negatively impact driver comfort and compatibility with other vehicle components.
Innovation Solution
A shift actuation mechanism featuring a vibration-decoupled mass connected via a coupling rod to a support bearing, allowing for reduced mass inertia while maintaining shifting performance, and utilizing a shift cable for transmission, with cost-effective and space-saving design elements such as elastic support bearings and stamped sheet metal components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a mass is attached to the shift lever to provide mass inertia for shifting, then shifting performance is improved, but vibrations from the engine are transmitted to the shift lever causing acoustic impairments and reduced driver comfort
Solution Approach 1:
The patent introduces a coupling rod as an intermediary element between the shift lever and the mass. This coupling rod is connected to the shift lever at one end and to the mass at the other end, allowing it to transmit shifting forces while isolating vibrations. The coupling rod acts as a mediator that separates the functional connection (force transmission) from the harmful connection (vibration transmission), thereby resolving the contradiction between improving shifting performance and reducing vibrations.
2Adaptability or versatility
If traditional shift actuation designs are used, then shifting function is achieved, but large installation space is required which limits adaptability to different vehicle configurations
Solution Approach 1:
The patent segments the shift actuation system into separate functional components: the shift lever, the coupling rod, and the mass. This segmentation allows each component to be optimized independently and arranged in different spatial configurations. The coupling rod can be positioned at various distances from the selector shaft, and the mass can be mounted at different locations, providing flexibility to adapt to different installation spaces and vehicle configurations without compromising the shifting function.
3Ease of operation
If conventional shift actuation components are used, then shifting function is achieved, but high provision costs and weight are incurred
Solution Approach 1:
The patent employs simple, inexpensive components such as a basic coupling rod and a straightforward mass element rather than complex, expensive shift actuation mechanisms. The coupling rod can be made from simple materials like steel or aluminum, and the mass can be a simple counterweight or inertia element. This approach achieves the required shifting function with minimal complexity, thereby reducing both provision costs and weight compared to conventional shift actuation 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
The solution effectively decouples vibrations, reduces weight and installation space requirements, and enhances driver comfort by optimizing mass inertia and shifting force transmission, while being cost-effective and adaptable to existing vehicle designs.
Implementation Method 1
The coupling rod can, for example—possibly exclusively—serve to transmit the inertial forces of inertia.
Implementation Method 2
the support bearing is also mounted in a vibration-decoupled manner
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a shift actuator (1) for a manual gearbox of a motor vehicle, which shift actuator can be actuated using a manual shift lever of the motor vehicle. The shift actuator (1) has a shift actuator lever (2) for actuating a shift shaft of the gearbox. The shift actuator lever - and therefore in particular the shift shaft - can be rotated about a shift rotation axis (DS) using a shift cable pull (3). The comfort of the vehicle driver is improved - in particular in a cost-effective, weight-saving and/or space-saving manner - by connecting the shift actuator lever (2) via a coupling rod (4) to a mass (6) rotatably mounted on a support bearing (5).