Swing Axle Hydraulic Pipe Layout to Prevent Component Interference

Solution Overview

Problem

In swing axle suspensions, the power steering cylinder and its supply pipe swing, leading to potential interference with peripheral components due to displacement, especially near the axle case.

Innovation Solution

A flexible and rigid pipe combination is used for the hydraulic oil supply pipe, with the rigid pipe fixed to the axle case and the flexible pipe allowing for bending to accommodate the swing, preventing interference with other components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a flexible supply pipe is used to accommodate the swing of the axle case, then the supply pipe can move with the axle case, but the pipe is more likely to be significantly displaced and interfere with peripheral components

Engineering Contradiction:

Improveadaptability to swing motionVSAvoidinterference with peripheral components

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The supply pipe is divided into two distinct segments: a flexible pipe portion and a rigid pipe portion. The flexible pipe portion accommodates the swing motion of the axle case, while the rigid pipe portion maintains stable positioning and prevents interference with peripheral components. This segmentation allows each portion to fulfill its specific function optimally.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different portions of the supply pipe are given different mechanical properties: the first portion near the axle case is made flexible to accommodate swing motion, while the second portion is made rigid to prevent displacement and interference. This local differentiation of properties resolves the contradiction between adaptability and stability.

Inventive Principle:

Principle #3Local quality

2Object-affected harmful factors

If a rigid supply pipe is used to maintain stable positioning, then interference with peripheral components is prevented, but the pipe cannot accommodate the swing motion of the axle case

Engineering Contradiction:

Improveinterference with peripheral componentsVSAvoidadaptability to swing motion

Core Design Contradiction:

Object-affected harmful factorsVSAdaptability or versatility

Solution Approach 1:

The supply pipe is divided into two distinct segments: a flexible pipe portion and a rigid pipe portion. The flexible pipe portion accommodates the swing motion of the axle case, while the rigid pipe portion maintains stable positioning and prevents interference with peripheral components. This segmentation allows each portion to fulfill its specific function optimally.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different portions of the supply pipe are given different mechanical properties: the first portion near the axle case is made flexible to accommodate swing motion, while the second portion is made rigid to prevent displacement and interference. This local differentiation of properties resolves the contradiction between adaptability and stability.

Inventive Principle:

Principle #3Local quality

3Adaptability or versatility

If the supply pipe is made completely flexible to accommodate swing motion, then the pipe can move with the axle case, but the pipe displacement becomes significant near the axle case

Engineering Contradiction:

Improveadaptability to swing motionVSAvoidpipe displacement

Core Design Contradiction:

Adaptability or versatilityVSLength of moving object

Solution Approach 1:

The supply pipe is divided into two distinct segments: a flexible pipe portion and a rigid pipe portion. The flexible pipe portion accommodates the swing motion of the axle case, while the rigid pipe portion maintains stable positioning and prevents interference with peripheral components. This segmentation allows each portion to fulfill its specific function optimally.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different portions of the supply pipe are given different mechanical properties: the first portion near the axle case is made flexible to accommodate swing motion, while the second portion is made rigid to prevent displacement and interference. This local differentiation of properties resolves the contradiction between adaptability and stability.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20250304151A1Work vehicle

Publication Date: 2025.10.02 YANMAR HLDG CO LTD

AI summary

A tractor includes an axle case that houses an axle of a wheel, a hydraulic cylinder that is attached to the axle case, a hydraulic valve that supplies hydraulic oil to the hydraulic cylinder, and a supply pipe that connects the hydraulic valve to the hydraulic cylinder and through which the hydraulic oil flows. The supply pipe includes a flexible pipe and a rigid pipe. A first end portion of the rigid pipe is connected to the hydraulic cylinder. A second end portion of the rigid pipe is connected to a first end portion of the flexible pipe.