Steering Column Clamp Mechanism with Loop Plate
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Solution Overview
Problem
Steering column assemblies require adjustable rake and reach mechanisms, but existing clamp mechanisms are prone to movement under load and wear prematurely, especially during frequent adjustments.
Innovation Solution
A clamp mechanism with a loop plate that secures the steering column shroud to a support bracket using a clamp pin and nut, providing robust locking and minimizing space obstruction, combined with an energy control member for crash absorption and a hardened toothed support bracket for enhanced security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional clamp mechanism is used to secure the steering column shroud, then the column can be adjusted for rake and reach, but the clamp mechanism is prone to movement under load and wears prematurely
Solution Approach 1:
The clamp mechanism is divided into separate functional components: a clamp body with gripping surfaces, a loop plate with attachment points, and a pin connection system. This segmentation allows each component to be optimized for its specific function while working together to provide both adjustability and stability.
Solution Approach 2:
The loop plate incorporates curved or rounded features that distribute loads more evenly across the connection points. The pin connection system uses cylindrical elements that provide rotational freedom while maintaining secure engagement, reducing stress concentrations and preventing premature wear.
2Reliability
If the clamp mechanism is made more robust to prevent movement under load, then reliability improves, but the device complexity increases
Solution Approach 1:
Multiple functions are combined into integrated components. The loop plate simultaneously provides structural support, load distribution, and connection interfaces. The pin connection system integrates both the fastening and adjustment release functions into a single mechanical interface, reducing the number of separate parts while maintaining reliability.
Solution Approach 2:
Instead of using a complex locking mechanism to prevent movement, the design uses a simple pin connection that allows controlled movement during adjustment but provides stable engagement during normal use. The reliability comes from the geometry and material properties rather than complex mechanical interlocks.
3Adaptability or versatility
If frequent adjustments are made to the steering column, then adaptability improves, but the clamp mechanism wears prematurely
Solution Approach 1:
The pin connection system allows for easy change of the engaged position by simply moving the pin to different locations on the loop plate or support bracket. This parameter change approach enables frequent adjustments without wear, as the pin itself does not degrade while sliding but rather the adjustment is achieved through discrete repositioning.
Solution Approach 2:
The clamp mechanism is designed to be self-retaining during normal use, requiring minimal intervention for adjustments. The pin connection system maintains its engagement automatically during routine operations, and adjustments are made by simple manual repositioning rather than requiring complex actuation mechanisms that would increase wear.
Data Source
AI summary
A steering column assembly includes a steering column shroud which supports a steering shaft for a steering wheel. The column shroud includes an inner member and an outer member. The inner member being at least partially received within the outer member. A support bracket is fixed in position relative to a part of the vehicle. A clamp mechanism is movable between a locked position in which the clamp mechanism fixes the inner member and the outer member in position relative to the support bracket and an unlocked position in which the clamp mechanism permits movement of at least one of the inner and outer members relative to the support bracket. The clamp mechanism includes a clamp pin that passes through an opening in the support bracket and is connected to a loop plate. The loop plate includes at least one loop portion that loops a portion of the shroud and which is drawn towards the support bracket as the clamp mechanism is moved to a locked position, thereby to clamp the shroud in position relative to the support bracket.