Hydraulic Selector Device for Smooth Torque Transitions

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Solution Overview

Problem

Hydraulic circuits with multiple motor sets experience jolting when changing overall cubic capacity, leading to loss of grip and synchronization issues due to sudden torque variations, which existing technologies fail to adequately mitigate.

Innovation Solution

Incorporating a selector device with means to sustain a temporary intermediate stage during position changes, constraining interconnections between main ducts to allow gradual fluid flow rate exchange, thereby limiting torque variations and preventing sudden deactivation of motor sets.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If the selector device quickly switches between stable positions to change overall cubic capacity, then the response time is reduced, but sudden torque variations cause jolting and loss of grip

Engineering Contradiction:

Improveresponse timeVSAvoidjolting and loss of grip

Core Design Contradiction:

Loss of timeVSObject-affected harmful factors

Solution Approach 1:

The selector device is designed to automatically enter an intermediate stage position before completing the switch between stable positions. This preliminary action of transitioning through the intermediate stage allows fluid flow rate exchange to occur gradually, preventing sudden torque variations and jolting while maintaining efficient overall response time.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The intermediate stage acts as an intermediary state between the two stable positions. During this intermediate phase, constricted interconnections between main ducts mediate the fluid flow transition, allowing gradual exchange of fluid flow rate and preventing abrupt torque changes that would cause jolting and loss of grip.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If the selector device sustains a temporary intermediate stage with constricted interconnections, then torque variations are limited and jolting is reduced, but the switching time increases

Engineering Contradiction:

Improvejolting severityVSAvoidswitching time

Core Design Contradiction:

Object-affected harmful factorsVSLoss of time

Solution Approach 1:

The selector device dynamically transitions through different operational states: quickly moving to the intermediate stage position, then sustaining it long enough to allow gradual fluid flow exchange, and finally completing the switch to the target stable position. This dynamic approach balances the need to limit jolting during the sustained intermediate phase with the overall switching time requirement.

Inventive Principle:

Principle #15Dynamics

3Productivity

If motor sets are quickly deactivated or activated during capacity changes, then the capacity switching is fast, but synchronization issues occur between vehicle-moving means

Engineering Contradiction:

Improvecapacity switching speedVSAvoidsynchronization between vehicle-moving means

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The system performs preliminary action by transitioning through the intermediate stage before completing the motor set deactivation or activation. This allows the hydraulic circuit to gradually adjust fluid flow rates, preventing sudden torque changes that would cause synchronization issues between vehicle-moving means while maintaining efficient overall switching speed.

Inventive Principle:

Principle #10Preliminary action

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach reduces the severity of jolting during cubic capacity changes by maintaining a temporary intermediate stage, allowing for smoother torque transitions and preventing loss of grip and synchronization issues, thus enhancing vehicle handling.

Implementation Method 1

constraining interconnections between main ducts to allow gradual fluid flow rate exchange

Methodology Applied

Scientific EffectFluid flow rate exchange:

Data Source

PatentUS7836993B2Device for selecting a hydraulic circuit overall capacity

Publication Date: 2010.11.23 POCLAIN HYDRAULICS IND

AI summary

A hydraulic circuit including a first motor set, and a second motor set for driving vehicle-moving means situated one behind the other. The circuit has first, second, third, and fourth main ducts for feeding the motor sets in parallel. The device includes a selector suitable for taking up a first stable position making the feeding in parallel possible by interconnecting in pairs the feed and discharge main ducts, and for taking up a second stable position in which one of the motor sets is inactive because one of the main ducts is connected to one of main ducts of the other set. Between the stable positions, the selector can take up a temporary position, in which all four main ducts are interconnected. At least while the selector is moving in one direction between its two stable positions, the temporary position is sustained in an intermediate stage during which at least one of the interconnections between the main ducts of the first and second motor sets is constricted.