Construction Machine Quick-Changer Rotary Joint Support Against Shock Loads

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Solution Overview

Problem

Existing quick-change systems for construction machines suffer from vibrations and damage due to impacts or shock loads, which can compromise the rotary joint and connection parts, and do not efficiently utilize the design space for fluid supply.

Innovation Solution

The rotary joint is radially supported within the drive housing, with a stator secured by a bearing ring and sealed by sealing elements, allowing for stable fastening and expanded movement capabilities, and the drive housing is pivotable for enhanced attachment rotation and tilting.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the stator is fastened onto the cover plate via flange and screws, then the rotary joint can be assembled, but vibrations from impacts or shock loads can damage the rotary joint and connection parts

Engineering Contradiction:

Improvestability of rotary jointVSAvoidvibrations and shock loads

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The stator is pre-guided radially by the bearing ring before final assembly, establishing proper alignment and position in advance. This preliminary radial guidance ensures the stator is correctly positioned within the drive housing, preventing misalignment under vibration and shock load conditions during operation

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The bearing ring acts as an intermediary component between the stator and the drive housing. It provides radial support and guidance for the stator, distributing loads and reducing the direct impact of vibrations and shock loads on the stator-flange-screw connection, thereby protecting the rotary joint

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If the stator protrudes far downward without radial support, then assembly is simplified, but vibrations can occur through impacts or shock loads during use

Engineering Contradiction:

Improveassembly simplicityVSAvoidradial stability of stator

Core Design Contradiction:

Ease of manufactureVSStability of the object's composition

Solution Approach 1:

The bearing ring serves as an intermediary that provides radial support to the stator without complicating the assembly process. It is integrated into the drive housing structure and automatically guides the stator during assembly, maintaining both ease of manufacture and radial stability

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The bearing ring performs multiple functions: it supports the drive wheel for rotation, provides radial guidance for the stator, and stabilizes the rotary joint against vibrations. This multi-functionality achieves radial stability without adding separate complex assembly steps

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of manufacture

If the design space in the drive housing is not optimally exploited, then assembly is easier, but higher number of supply channels with larger flow rates cannot be accommodated

Engineering Contradiction:

Improveassembly easeVSAvoidhydraulic fluid flow rate

Core Design Contradiction:

Ease of manufactureVSQuantity of substance

Solution Approach 1:

The bearing ring utilizes the radial dimension of the drive housing effectively, providing stator support in the radial direction while allowing optimal use of the axial and circumferential dimensions for arranging multiple supply channels. This dimensional optimization enables more supply channels without compromising assembly ease

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

4Device complexity

If sealing elements are not used, then assembly is simpler, but oil or dirt can get between the drive housing and the stator

Engineering Contradiction:

Improvesealing structure complexityVSAvoidoil and dirt ingress

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The sealing element acts as an intermediary barrier between the drive housing and the stator. It is integrated into the radial support structure, providing sealing functionality without adding separate complex assembly steps, thus preventing oil and dirt ingress while maintaining assembly simplicity

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12352005B2Quick-change system for changing attachments on a construction machine

Publication Date: 2025.07.08 OILQUICK DEUT KG

AI summary

A quick-change system for changing attachments on a construction machine includes a quick changer mounted to rotate in a drive housing of a rotary device and rotatable relative to drive housing by a rotary drive, and a rotary joint arranged in the drive housing with a stator and a rotor rotatable within stator to supply a working fluid to the quick changer. In order to permit simple and stable fastening of the rotary joint, the stator of the rotary joint arranged within a through-opening of the drive housing is radially supported against the drive housing above an upper end surface and beneath the upper end surface of a drive wheel of the rotary drive arranged in the drive housing.