Resin Torque Rod Rib Geometry for Rigidity

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Solution Overview

Problem

Resin torque rods face challenges in achieving high rigidity while being compactified for improved mountability without compromising their structural integrity.

Innovation Solution

The resin torque rod features ring sections with laterally projecting ribs whose heights are inclined and vary in depth, connected by a vertical rib, allowing for enhanced rigidity and compactification while preventing voids and improving cooling properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If the resin torque rod is compactified to improve mountability, then the size is reduced, but the rigidity is compromised

Engineering Contradiction:

Improvesize of torque rodVSAvoidrigidity of torque rod

Core Design Contradiction:

Volume of moving objectVSStrength

Solution Approach 1:

The patent applies local quality by varying the projecting heights of lateral ribs along the longitudinal direction, creating different structural characteristics in different regions. The ribs have higher projecting heights in the middle portion and lower heights toward the ends, providing localized rigidity enhancement where needed while maintaining compact overall dimensions.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent introduces dimensional variation by configuring lateral ribs with inclined projecting heights in the longitudinal direction, adding a gradient dimension to the rib structure. This dimensional change allows the ribs to provide progressive structural support, enhancing rigidity without uniformly increasing the overall size of the torque rod.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Strength

If the projecting heights of lateral ribs are increased to enhance rigidity, then the structural strength is improved, but the size increases and compactification is hindered

Engineering Contradiction:

Improverigidity of torque rodVSAvoidsize of torque rod

Core Design Contradiction:

StrengthVSVolume of moving object

Solution Approach 1:

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent applies partial action by providing rib height variation only in specific regions (middle portion versus ends) rather than uniformly throughout. This partial differentiation allows rigidity enhancement where most needed while avoiding unnecessary size increase in regions where full rigidity is not required.

Inventive Principle:

Principle #16Partial or excessive action

3Ease of manufacture

If the lateral ribs are uniformly distributed to simplify manufacturing, then the production process is easier, but the cooling properties and structural efficiency are reduced

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidcooling properties

Core Design Contradiction:

Ease of manufactureVSTemperature

Solution Approach 1:

The patent applies local quality by creating unequal groove depths between neighboring lateral ribs, resulting in varied projecting heights. This local differentiation improves cooling properties by creating varied flow paths for coolant, while still maintaining a relatively simple overall manufacturing process through integral formation.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent applies parameter changes by varying the depth parameter of grooves between lateral ribs, which directly changes the projecting height parameter of the ribs. This parameter variation enhances cooling efficiency by creating diverse coolant flow channels while maintaining manufacturing feasibility through a single integral forming process.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9796255B2Resin torque rod

Publication Date: 2017.10.24 YAMASHITA RUBBER CO LTD

AI summary

A first ring section and a second ring section made of resin are integrally formed in both ends in the direction of a center axis of a rod section. A plurality of first ribs, intermediate ribs, and second ribs are provided in an outer circumferential surface of the second ring section so as to project in the direction intersecting at right angles to a center axis of the second ring section. The first ribs and the intermediate ribs, and the second ribs each are integrally connected on either side in the left and right direction to vertical ribs that are formed long in the direction of the center axis. Projecting heights of the vertical ribs and the second ribs are varied along inclined straight lines.