Tilt-Telescopic Steering Guide Bush Vibration Control
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Solution Overview
Problem
The existing tilt-and-telescopic steering systems face challenges in maintaining sufficient strength and preventing resonance during low RPM vehicle idling, where the increased engine vibration affects the steering system's stability and telescopic force.
Innovation Solution
A guide bush is inserted through an exterior tube and a distance member, simultaneously holding the exterior and interior tubes, enhancing their fixing strength when a lever is operated, and featuring a unique configuration with contact surfaces to ensure secure coupling and reduce idle vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the telescopic bush is inserted between the interior tube and the exterior tube to enable smooth sliding, then the ease of operation is improved, but the strength and vibration resistance deteriorate at low RPM
Solution Approach 1:
The bush is divided into two distinct parts: a telescopic bush for smooth sliding operation and a guide bush for strength and vibration resistance. This segmentation allows each component to specialize in its function without compromise.
Solution Approach 2:
The guide bush acts as an intermediary component between the interior tube and exterior tube, providing the necessary structural support and vibration resistance while allowing the telescopic bush to perform its sliding function.
2Reliability
If the telescopic bush strength is increased to prevent resonance at low RPM, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The bush assembly is segmented into two functional components (telescopic bush and guide bush), allowing the complex vibration resistance requirements to be handled by the dedicated guide bush without complicating the telescopic bush design.
Solution Approach 2:
The guide bush serves multiple functions simultaneously: providing structural strength, preventing resonance at low RPM, guiding tube alignment, and supporting the telescopic bush assembly.
3Strength
If the guide bush is inserted through the exterior tube and distance member to hold both tubes, then the fixing strength is improved, but the device complexity increases
Solution Approach 1:
The guide bush performs multiple functions within a single component: holding the interior and exterior tubes, preventing resonance, providing structural strength, and guiding alignment during telescopic movement.
Solution Approach 2:
The guide bush is nested within the exterior tube and distance member assembly, with the telescopic bush nested within the guide bush, creating a compact multi-functional assembly that minimizes space while maximizing functionality.
Data Source
Figure 1
Figure 2
Figure 3a
AI summary
A tilt-and-telescopic steering system having a guide bush (280), the system including an interior tube (210) and an exterior tube (220) which surround a steering shaft; a distance member (250) integrally fixed in an outer peripheral surface of the exterior tube (220); tilt brackets (230) assembled with an outer peripheral surface of the distance member (250) so as to limit a movement angle in tilt operation; and a lever (240) and a lever bolt (260) which hold and release the tilt-and-telescopic system, wherein a through hole (310) is formed in the exterior tube (220) and the distance member (250), the through hole (310) being disposed between an outer peripheral of the interior tube (210) and an inner peripheral surface of the tilt bracket (230), so that a guide bush (280) is inserted in the through hole (310).