Concrete Mixer Drum Stops for Lateral Shift and Rollover Control

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Solution Overview

Problem

Concrete mixing vehicles are prone to rollover due to centrifugal forces acting on the mixing drum during turns, especially when the drum's center of gravity is elevated, increasing the likelihood of the drum moving off-center and causing the vehicle to roll over.

Innovation Solution

A vehicle design with a rotatable mixing drum supported by a chassis, featuring a rear pedestal with drum rollers and stops to prevent lateral movement beyond a predetermined distance from the vehicle's centerline, along with a contact detection system to alert the operator when the drum contacts the stop.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the mixing drum is supported on drum rollers allowing rotation, then the mixing drum can rotate to mix concrete, but the mixing drum may move laterally off-center during turns causing roll-over

Engineering Contradiction:

Improvemixing drum rotationVSAvoidvehicle stability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The stop is positioned in advance to counteract the lateral movement of the mixing drum before it can move off-center during turns. The stop provides preliminary resistance to centrifugal forces, preventing the drum from shifting laterally and maintaining vehicle stability while allowing rotation for mixing.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The stop acts as an intermediary element between the mixing drum and the vehicle chassis. It mediates the interaction by providing a controlled contact point that allows rotational movement while restraining lateral displacement, thus enabling mixing function while ensuring vehicle stability.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If the mixing drum is allowed to move freely on the chassis, then the drum can adjust position during mixing, but the drum may swing under centrifugal forces increasing roll-over risk

Engineering Contradiction:

Improvedrum position adjustmentVSAvoidcentrifugal force effects

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The stop is pre-positioned to counteract centrifugal forces before they can cause harmful swinging motion. During turns, the stop provides preliminary resistance that prevents the drum from moving beyond a safe lateral distance, eliminating the roll-over risk while allowing necessary position adjustments for mixing.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The stop converts the harmful effect of centrifugal forces into a beneficial constraint. By providing a predetermined contact point, the stop uses the lateral forces to keep the drum centered rather than allowing uncontrolled swinging, thus transforming potential harm into a stabilizing mechanism.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Reliability

If stops are placed close to the mixing drum, then lateral movement is restricted effectively, but the drum may contact the stop during normal operation causing wear

Engineering Contradiction:

Improvelateral movement restrictionVSAvoidcomponent wear

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The stop is positioned at a predetermined distance from the mixing drum, establishing a safe operational gap before lateral movement occurs. This preliminary positioning ensures that the drum only contacts the stop when necessary to prevent roll-over, minimizing wear during normal mixing operations while maintaining effective lateral restriction.

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

Reduces the risk of vehicle rollover by preventing the mixing drum from moving laterally and arresting its movement before it becomes uncontrolled, thereby maintaining stability during turns.

Implementation Method 1

a pair of drum rollers configured to contact the drum ring; and at least one stop configured to prevent lateral movement of the rotatable mixing drum

Methodology Applied

Scientific EffectFriction: Friction

Implementation Method 2

centrifugal force acts on the vehicle in a direction opposite to the direction of the turn

Methodology Applied

Scientific EffectCentrifugal force: Centrifugal Force

Data Source

PatentUS20260014922A1A Vehicle for Mixing Concrete

Publication Date: 2026.01.15 TOTAL VEHICLE SOLUTIONS GRP LTD

AI summary

The present invention relates to a vehicle for mixing concrete. The vehicle comprises: a cabin configured to allow an operator to control the vehicle, a chassis comprising a frame configured to support a load on the vehicle, the frame having a longitudinal axis that is substantially parallel to the ground, and a rotatable mixing drum supported on the chassis such that the longitudinal axis of the mixing drum is inclined relative to the longitudinal axis of the frame. The mixing drum comprises a drum ring and being configured to hold and mix a load. The chassis comprises a rear pedestal on which the drum ring of the mixing drum is supported, and the rear pedestal comprises a pair of drum rollers configured to contact the drum ring. The vehicle further comprises at least one stop configured to prevent lateral movement of the rotatable mixing drum beyond a predetermined distance from a centreline of the vehicle.