Upper Slewing Body Cab Deck Vibration Suppression

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Solution Overview

Problem

Conventional upper slewing bodies experience vibration and noise issues due to the transmission of vibrations from engines to cabs, leading to deteriorated ride quality, and increasing the size of deck supporting members to mitigate this increases mass and cost.

Innovation Solution

The design includes a slewing frame with a cab deck separated from the engine deck by a gap, and a deck supporting member connected to the slewing frame, utilizing a side-plate supporting member to restrain the cab deck from vibration while maintaining a reduced mass.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the deck supporting member is increased in size to suppress vibration of the cab deck, then the vibration restraint effect is improved, but the mass of the deck supporting member increases

Engineering Contradiction:

Improvevibration restraint effectVSAvoidmass of deck supporting member

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

The patent introduces a side-plate supporting member that connects the cab deck to the side plate of the slewing frame, adding a lateral support dimension. This creates a spatial configuration where the deck supporting member and side-plate supporting member work together in different orientations, improving vibration restraint without requiring the deck supporting member alone to be oversized.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The support function is divided between two separate components: the deck supporting member (connecting engine deck to cab deck) and the side-plate supporting member (connecting side plate to cab deck). This segmentation allows each component to be optimized independently, with the side-plate supporting member bearing part of the vibration restraint load, enabling the deck supporting member to have reduced mass.

Inventive Principle:

Principle #1Segmentation

2Reliability

If the deck supporting member is increased in size to suppress vibration of the cab deck, then the vibration restraint effect is improved, but the cost of the upper slewing body increases

Engineering Contradiction:

Improvevibration restraint effectVSAvoidcost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The side plate, which is an existing structural component of the slewing frame, is utilized as a mounting point for the side-plate supporting member. This allows the structure to support itself without requiring additional heavy reinforcement of the deck supporting member, reducing material costs and manufacturing complexity.

Inventive Principle:

Principle #25Self-service

3Object-affected harmful factors

If the cab deck is separated from the engine deck to suppress vibration transmission, then the vibration transmission is reduced, but the cab deck vibration in lateral-deformation mode increases

Engineering Contradiction:

Improvevibration transmission to cabVSAvoidcab deck vibration control

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The side-plate supporting member acts as an intermediary that connects the separated cab deck to the slewing frame's side plate. This intermediary component provides lateral support to the cab deck, preventing excessive lateral deformation vibrations while maintaining the separation between the engine deck and cab deck to reduce vibration transmission from the engine.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS10494038B2Upper slewing body

Publication Date: 2019.12.03 KOBE STEEL LTD

AI summary

The vibration of a cab deck as well as the mass of a deck supporting member is suppressed. A slewing frame of an upper slewing body includes a front plate connected to a second side plate. A cab deck is disposed on a front side of an engine deck with a gap between the cab deck and the engine deck. A deck supporting member is connected to the second side plate and the cab deck. When viewed along an up-and-down direction, a connection portion of the front plate to be connected to the second side plate is opposed to, in the lateral direction via the second side plate, a connection portion of the deck supporting member to be connected to the second side plate.