Parking Brake Control That Blocks Braking During Upper Body Turning
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Solution Overview
Problem
Existing parking brake systems in work machines can cause sudden stops of the upper turning body during turning, leading to potential swing or damage of suspended loads due to improper operation.
Innovation Solution
A parking brake apparatus with a braking controller that judges turning motions and invalidates braking operations when certain conditions are met, preventing the brake from engaging during turning to avoid sudden stops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the parking brake is made switchable between braking and braking release states, then the parking brake can effectively hold the upper turning body, but the parking brake may cause sudden stops during turning operations
Solution Approach 1:
The patent applies dynamics by making the brake operation device movable between locked and unlocked states. When the upper turning body is detected to be turning, the brake operation device is unlocked, allowing the parking brake to be operated. When not turning, the device is locked, preventing operation. This dynamic state change resolves the contradiction by adapting the brake's operability to the actual turning condition.
Solution Approach 2:
The patent introduces a brake operation device as an intermediary between the operator and the parking brake. This device mediates the braking operation by mechanically locking or unlocking based on turning detection. The intermediary prevents direct operation of the parking brake during turning, thereby eliminating the harmful sudden stop effect while maintaining braking reliability when appropriate.
2Ease of operation
If the parking brake can be operated during turning, then braking control is available, but load swing and attachment damage may occur
Solution Approach 1:
The patent applies preliminary action by detecting the turning state of the upper turning body in advance and proactively locking the brake operation device before any braking operation can be initiated. This preventive measure ensures that even if the operator attempts to operate the brake during turning, the mechanical lock prevents the action from reaching the parking brake, thereby avoiding load swing and attachment damage.
Solution Approach 2:
The brake operation device serves as a protective intermediary that physically prevents the transmission of braking operations to the parking brake when turning is detected. This intermediary mechanism filters out harmful operations while allowing legitimate ones, resolving the contradiction between operational availability and prevention of harmful effects.
Data Source
AI summary
Provided is a parking brake apparatus installable on a work machine. The parking brake apparatus includes: a parking brake switchable between a braking state of braking the turning of an upper turning body and a braking release state; a brake operation device to which a braking operation and a braking release operation for switching the parking brake to the braking state and the braking release state, respectively, is applied by an operator; and a braking control unit. The braking control unit judges whether or not a turning judgment requirement for judging whether or not the upper turning body is performing a turning motion is satisfied, and performs a braking operation invalidation control to invalidate the braking operation applied to the brake operation device when judging the turning motion is being performed.