Pivotal Cable Guide for Tiltable Cabin Gear Shift
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The tiltable driver's cabin in heavy vehicles poses challenges for mechanical communication between the driver's cabin and the gear box, particularly due to limited space and increased cable length, which results in high frictional forces and material costs, as well as the need for heat-resistant materials in the control cable.
Innovation Solution
A gear shift system with a pivotally connected cable guide that adapts to the cabin's tilt, allowing for a significantly shorter control cable length and eliminating the need for sharp bends, thereby reducing the cable's exposure to hot areas and limited spaces, while maintaining ergonomic actuation lever placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the control cable is routed through the very forward portion of the vehicle near the pivot axis, then the cable can accommodate cabin tilting movement, but the cable length becomes excessively long and frictional forces increase
Solution Approach 1:
A cable guide is introduced as an intermediary component between the actuation lever and the gear box. The cable guide is pivotally connected to the driver's cabin and includes a guide opening that directs the control cable. This intermediary allows the cable to follow a more direct path while still accommodating cabin tilting through the pivotal connection of the guide itself.
Solution Approach 2:
The cable guide is positioned at a different spatial location (not in the very forward portion near the pivot axis) and uses a pivotal connection that adds a rotational degree of freedom. This dimensional change allows the cable routing to adapt to cabin tilting without requiring excessive cable length or passing through hot areas.
2Adaptability or versatility
If the control cable is routed parallel to the cabin floor forward in front of the cooler system, then the cable can follow the pivot movement, but heat-resistant material is required and production costs increase
Solution Approach 1:
The cable guide acts as an intermediary that redirects the control cable away from the hot area near the cooler system. By positioning the cable guide at a different location and orienting its guide opening appropriately, the cable is routed through a cooler path while still maintaining the necessary flexibility for pivot movement.
3Length of moving object
If the actuation lever is arranged in the dashboard, then cable length is reduced and curvatures are minimized, but space is required in the forward portion and ergonomic preferences are compromised
Solution Approach 1:
The cable guide serves as a mediator that enables the actuation lever to remain in its conventional ergonomic position on the cabin floor while still achieving shorter cable length. The pivotal connection of the cable guide allows it to compensate for the distance, reducing the need for excessive cable length without requiring the lever to be moved to the dashboard.
4Ease of repair
If decoupling of mechanical communication is performed before cabin tilting, then access to the gear box is enabled, but additional decoupling and recoupling steps are required and complexity increases
Solution Approach 1:
The cable guide acts as a permanent intermediary connection that remains engaged during cabin tilting, eliminating the need for decoupling and recoupling operations. The pivotal connection allows the cable guide to move with the cabin while maintaining continuous mechanical communication, thereby simplifying maintenance procedures.
Solution Approach 2:
The cable guide is designed with a pivotal connection that dynamically adapts to the cabin's tilted position. This dynamic capability allows the mechanical communication to be maintained continuously during tilting, removing the need for static decoupling procedures and simplifying the overall system complexity.
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 reduces cable length, minimizes frictional forces, and lowers production costs by avoiding the use of heat-resistant materials, while ensuring reliable communication between the actuation lever and the gear box during cabin tilting.
Implementation Method 1
The longer the control cable is the more frictional force needs to be overcome
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention refers to a gear shift system for a vehicle with a tiltable driver's cabin comprising an actuation lever (1) operably mounted to the driver's cabin, a flexible control cable (11) coupled to the actuation lever (1) for transferring shift commands towards a gear box, and a cable guide (9) arranged to guide the control cable (11), characterised in that the cable guide (9) is pivotally connected to the driver's cabin, such that the cable guide (9) is able to pivot relative to the driver's cabin when the driver's cabin is tilted relative to the vehicle frame (17).