Steering Column Telescopic Bush Friction Reduction
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Solution Overview
Problem
Conventional telescopic devices for vehicle steering columns experience friction and rapid wear due to contact between the tilt bolt and the inner surface of the through-hole, leading to noise and frequent component failure.
Innovation Solution
A telescopic device with a telescopic bush having a fixing hole for the tilt bolt, which is inserted into a guide hole in the external tube, allowing the tilt bolt to maintain a predetermined height and minimizing contact with the inner surface, thereby reducing friction and wear. The bush is connected to the internal tube through a multi-point contact connection part, dispersing the load and stabilizing the assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a telescopic bush made of elastic material is provided at the inner surface of the through-hole to prevent wear, then physical wear is prevented, but friction increases and the telescopic bush itself is rapidly worn
Solution Approach 1:
A telescopic bush is introduced as an intermediary component between the tilt bolt and the through-hole. The bush has a through-hole that guides the tilt bolt, preventing direct contact between the tilt bolt and the inner surface of the external tube's through-hole. This mediator reduces friction and wear on the tilt bolt while the bush itself absorbs the wear through its elastic material properties.
2Object-generated harmful factors
If the telescopic bush is inserted into the guide hole to fix the tilt bolt position, then friction and wear are reduced, but the number of components increases
Solution Approach 1:
The telescopic bush combines multiple functions into a single component: it serves as both a guide for the tilt bolt (through its own through-hole) and as a positioning element (by protruding into the guide hole of the external tube). This merging of functions reduces the need for separate guide components and positioning elements, thereby not increasing the overall component count despite adding the telescopic bush.
3Ease of operation
If the tilt bolt passes through the through-hole of the external tube to enable telescopic motion, then telescopic motion is enabled, but friction occurs between the tilt bolt and the inner surface of the through-hole
Solution Approach 1:
The telescopic bush acts as a mediator between the tilt bolt and the external tube's through-hole. The tilt bolt passes through the telescopic bush's through-hole rather than directly through the external tube's through-hole. This intermediary structure enables the telescopic motion to continue while preventing direct frictional contact between the tilt bolt and the external tube, thereby reducing noise and wear.
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 minimizes friction and wear between components, reducing noise and extending the lifespan of the device while also reducing the number of components, thus lowering costs.
Implementation Method 1
an elastic telescopic bush 25 was provided at the inner surface of the through-hole 22
Data Source
AI summary
A telescopic device of a steering column for a vehicle includes an internal tube (200) connected to a vehicle body and formed in a lengthwise direction, a telescopic bush (250) provided around the internal tube (200) and having a fixing hole (252), through which a tilt bolt (300) of a tilt device enabling a steering column to have a tilt motion passes, so as to fix the tilt bolt (300), and an external tube (100) provided to enclose an outer side of the internal tube (200) and to move in a telescopic motion in the lengthwise direction of the internal tube (200) and having a guide hole (120) formed in the lengthwise direction so that the telescopic bush (250) is inserted therein and protrudes.