Accelerator Device Arm Opening Segmentation
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Solution Overview
Problem
Existing accelerator devices with organ structures are prone to catching foreign matter in the opening between the arm and the case, leading to potential interference and accumulation of debris.
Innovation Solution
The accelerator device incorporates a protrusion surrounding the entire circumference of the opening, an angled upper peripheral surface, an expanded gap between the inner wall and arm, and a recess-free arm surface to prevent foreign matter from entering and being stored within the case.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an opening is provided in the case for the arm to pass through, then the arm can connect the pad to the inside movable mechanism, but foreign matter can enter the case and accumulate in the opening
Solution Approach 1:
The opening is segmented by dividing it into two regions: a first region with a larger cross-sectional area for arm passage, and a second region with a smaller cross-sectional area that prevents foreign matter entry. This segmentation allows the opening to simultaneously fulfill the function of arm connection while preventing harmful foreign matter from entering the case.
Solution Approach 2:
Different regions of the opening are given different local qualities: the first region has a larger cross-sectional area to accommodate arm movement, while the second region has a smaller cross-sectional area specifically designed to block foreign matter. This local differentiation allows each region to perform its specific function optimally.
2Speed
If the opening has a larger cross-sectional area for arm movement, then the arm can move smoothly, but foreign matter can more easily enter and accumulate
Solution Approach 1:
The opening is divided into a first region with larger cross-sectional area for smooth arm movement and a second region with smaller cross-sectional area that acts as a barrier to foreign matter. This segmentation ensures that arm movement is facilitated while foreign matter accumulation is prevented.
Solution Approach 2:
The opening structure extends in multiple dimensions with varying cross-sectional areas along its length. By changing the cross-sectional area dimension along the opening's axis, the design allows large-area passage for the arm while incorporating small-area sections that block foreign matter entry.
Data Source
AI summary
An accelerator device having an organ structure includes: a pad configured to be pressed by a driver; a case configured to be attached to a vehicle body; an inside movable mechanism housed in the case; and an arm that passes through an opening formed in an outer wall of the case and connects the pad to the inside movable mechanism. The arm has a rectangle shape in a cross section. An entire circumference of the opening is surrounded by a protrusion protruding toward the pad. The protrusion includes an upper surface, and the upper surface has an inclination portion that slopes down rightward or leftward, when viewed from the pad.