Gearshift Lever Reverse Lockout Cable Nesting
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Solution Overview
Problem
Existing gearshift levers with reverse gear lock-out mechanisms face challenges in efficiently transmitting control forces with sharp curvature between the gearshift knob and the ball, particularly when the gearshift lever rod has sharp bends, leading to inconvenient operation and unsuitable force transmission.
Innovation Solution
A gearshift lever design incorporating a control line sheath beneath the gearshift knob, with a transmission mechanism such as a control cable or electronic signal, that allows for easy force transmission to the reverse gear lock-out, even with sharp curvatures, using a detent and elbow lever mechanism to block or unblock the reverse gear lock-out, enabling safe and simple operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a control cable is placed outside the gearshift rod to actuate the reverse gear lock-out, then the reverse gear lock-out function is achieved, but the gearshift lever requires no curvature which complicates the design for curved levers
Solution Approach 1:
The control cable is nested inside the gearshift lever rod, with the cable running through the hollow interior of the rod. This eliminates the need for external cable routing and allows the lever to have any curvature without compromising the control mechanism. The cable is anchored at both ends within the lever structure, creating a compact integrated design.
2Ease of operation
If an angle mechanism is used to redirect control cable forces onto the lever shaft, then force transmission is achieved with curved levers, but the mechanism becomes costly and complex
Solution Approach 1:
The angle mechanism is completely removed from the design. Instead of using complex diversion mechanisms to redirect forces, the control cable is positioned to act directly on the lever shaft at the appropriate angle. The cable applies force directly to the shaft without requiring intermediate angle mechanisms, simplifying the overall structure while maintaining effective force transmission.
3Volume of moving object
If the control mechanism is placed in the console beneath the gearshift knob, then space utilization is improved, but transmitting control force with sharp curvature becomes inconvenient and difficult
Solution Approach 1:
The control cable is nested within the hollow gearshift lever rod, allowing the control mechanism to be positioned in the console while maintaining direct force transmission. The cable runs through the interior of the curved rod and applies force directly to the lever shaft, eliminating the problems associated with transmitting forces through sharp external curvatures.
4Reliability
If known methods block the motions of the gearshift lever to accomplish reverse gear lock-out, then safety is improved, but the operation becomes less convenient and smooth motion is disrupted
Solution Approach 1:
A separate locking element is introduced as an intermediary component. This locking element engages with a corresponding feature on the lever to prevent reverse gear selection, while the control cable acts on the lever shaft independently. The locking mechanism operates separately from the lever's normal shifting motions, maintaining smooth operation for forward gears while providing safety blocking for reverse gear.
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
Enables reliable and efficient reverse gear lock-out operation with sharp curvatures without costly mechanisms, maintaining smooth gearshift lever motion while ensuring safety and simplicity in gear shifting.
Implementation Method 1
a cable control line is also possible for actuation, with a detent for the cable control line that may have a curvature, optionally even a sharp curvature, between the control line sheath and the ball
Implementation Method 2
Various suitable mechanisms can be placed as the transmission mechanism between the control line sheath and reverse gear
Data Source
AI summary
A gearshift lever with a reverse gear lock-out, having a manual gearshift lever with a gearshift knob, beneath which are placed the control line sheath, the ball, an elbow lever, and the transmission mechanism to actuate reverse gear. There is a lever of the reverse gear lock-out that can pivot around a pin in the housing, on which the transmission mechanism acts, and that blocks the motion of the elbow lever. The elbow lever has one shaft that can pivot on the housing and another shaft that receives a selector finger of the ball.