Vehicle Shifting Arm Vibration Reduction via Three-Bearing Design
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Solution Overview
Problem
Manual transmission shift knobs in vehicles with automatic engine/stop systems experience undesirable deflections and vibrations, especially when the engine is started, due to the frequent switching on and off in stop-and-go traffic, which conventional vibration absorbers fail to adequately address.
Innovation Solution
A shifting device with an external shifting system featuring a shifting arm supported by three bearings, allowing for pivoting and elastic movement, which mounts the shift lever immovably in the transverse direction and couples it to a selector shaft via a shift rod, effectively eliminating transverse movements and vibrations by compensating with opposing movements of the shift rod.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional vibration absorbers are used to reduce vibrations, then vibrations during engine operation are reduced, but the device becomes more complex and heavier, and deflections during engine starting are not adequately addressed
Solution Approach 1:
The shifting arm is divided into multiple sections with different bearing points, creating segmented support zones that independently handle different types of movements (transverse, longitudinal, vertical), allowing complex vibration reduction without overall system complexity
Solution Approach 2:
The three bearing points act as intermediary elements between the shifting arm and the vehicle body, mediating and filtering out vibrations and deflections before they reach the shift knob, while maintaining the simplicity of the overall shifting mechanism
2Object-affected harmful factors
If vibration absorber masses are added to reduce vibrations, then vibrations during engine running are reduced, but additional weight of around 500g is added and deflections during engine starting are hardly suitable
Solution Approach 1:
The shifting arm structure itself provides vibration reduction functionality through its three-bearing-point design, eliminating the need for separate vibration absorber masses. The system uses its own structural configuration to counteract vibrations without adding external weight
Solution Approach 2:
The invention changes the structural parameters of the shifting arm (adding three bearing points at specific locations) rather than adding mass parameters (vibration absorber masses). This structural parameter change achieves vibration reduction without increasing weight
3Stability of the object's composition
If the shifting arm is rigidly mounted to eliminate all movements, then transverse movements are eliminated, but the device loses necessary mobility and elasticity for proper operation
Solution Approach 1:
The shifting arm is designed with dynamic characteristics through three bearing points that allow controlled movements in specific directions while restricting movements in other directions. This creates a dynamically stable system that adapts to operational requirements
Solution Approach 2:
Different sections of the shifting arm have different mobility characteristics: the first bearing point allows transverse movement compensation, the second allows longitudinal pivoting, and the third allows vertical/longitudinal elasticity, creating local quality variations that achieve overall stability while maintaining necessary adaptability
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 design significantly reduces vibrations and deflections of the shift knob when the engine starts, maintaining simplicity in construction and ensuring minimal disturbance from engine jerks and transverse movements.
Implementation Method 1
a third shift arm bearing (e.g. rear shift arm bearing) is provided, via which a second end section of the shift arm facing away from the first end section is elastically and/or displaceably connected directly or indirectly to a body element of the vehicle body in a vehicle transverse direction
Data Source
Figure 1
AI summary
The shifting device (1) has a shift lever (4) and a shifting arm (2) extended in a longitudinal direction (x), where the shifting arm is mounted on the shift lever in a pivoted manner. A first shifting arm bearing (9) is provided, by which the shifting arm is pivoted at a location of the first shifting arm bearing around a vertical axis (z) of a vehicle and immovable in a transverse direction (y) of the vehicle. A second shifting arm bearing (13) is formed as a pivot bearing.