Negative Pressure Booster Front Shell Elliptical Rib Design

Solution Overview

Problem

The existing negative pressure-type booster devices face challenges in standardizing front shells due to varying installation pitches and angles of tie-rod holes, leading to uneven stress distribution and potential deformation, which complicates production and increases costs by requiring multiple shell types.

Innovation Solution

The solution involves forming reinforcement ribs on the front shells along a virtual ellipse that aligns with the center and major axis connecting the tie-rod holes, allowing for consistent distance placement regardless of different installation pitches and angles, thereby standardizing the shells and reducing stress concentration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If reinforcement ribs are formed around tie-rod holes in the front shell to reduce shell thickness, then the shell weight and material usage are reduced, but the front shells cannot accommodate varying installation pitches and angles of tie-rod holes, requiring multiple shell types

Engineering Contradiction:

Improveshell material usageVSAvoidaccommodation of varying installation pitches

Core Design Contradiction:

Quantity of substanceVSAdaptability or versatility

Solution Approach 1:

The patent applies local quality by forming reinforcement ribs with specific geometric configurations (circular arcs, radial lines, ellipses) at specific locations around the tie-rod holes. These localized reinforcement patterns provide structural strength exactly where needed while maintaining shell thinness elsewhere, enabling a single shell design to handle multiple tie-rod hole configurations without requiring multiple shell types

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent achieves universality by designing a standardized front shell with reinforcement ribs that can accommodate multiple tie-rod hole installation pitches and angles. The reinforcement rib patterns are positioned and shaped to provide structural support regardless of where the tie-rod holes are located, allowing one shell design to serve multiple mounting configurations

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If multiple types of front shells are produced to accommodate different installation pitches and angles, then adaptability to various tie-rod hole configurations is improved, but production complexity and costs increase

Engineering Contradiction:

Improveaccommodation of varying installation pitchesVSAvoidnumber of shell types

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent achieves universality by designing a standardized front shell with reinforcement ribs that can accommodate multiple tie-rod hole installation pitches and angles. The reinforcement rib patterns are positioned and shaped to provide structural support regardless of where the tie-rod holes are located, allowing one shell design to serve multiple mounting configurations

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Adaptability or versatility

If reinforcement ribs are positioned to accommodate different tie-rod hole locations, then adaptability is improved, but stress distribution becomes uneven, causing shell deformation

Engineering Contradiction:

Improveaccommodation of varying installation pitchesVSAvoidstress distribution uniformity

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The patent applies local quality by forming reinforcement ribs with specific geometric configurations (circular arcs, radial lines, ellipses) at specific locations around the tie-rod holes. These localized reinforcement patterns provide structural strength exactly where needed while maintaining shell thinness elsewhere, enabling a single shell design to handle multiple tie-rod hole configurations without requiring multiple shell types

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent employs curved geometric forms for the reinforcement ribs, including circular arcs centered on the shell axis and elliptical patterns. These curved configurations distribute stress more evenly around the tie-rod holes compared to straight-line ribs, preventing stress concentration and shell deformation while accommodating varying hole positions

Inventive Principle:

Principle #14Spheroidality (Curvature)

Data Source

PatentUS10077035B2Negative pressure-type booster device

Publication Date: 2018.09.18 ADVICS CO LTD

AI summary

The present invention addresses the problem of standardizing a front shell of a booster shell of a negative pressure-type booster device by modifying the shape of a reinforcement rib provided to the front shell so as to satisfy the demand for varying the installation pitch and installation angle of tie-rod holes with one and the same front shell. A front shell configuring a booster shell of a negative pressure-type booster device in combination with a rear shell includes a reinforcement rib formed by bending the shells, wherein the reinforcement rib is formed along a virtual ellipse of which the center is located at the center of the front shell, with the major axes of the ellipse disposed on a line connecting the centers of two tie-rod holes provided in the front shell.