Parking Brake Cable Stopper Prevents Over-Tightening
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Solution Overview
Problem
The existing parking brake systems face issues where the bolt screw and nut screw can become excessively tightened, leading to an inability to release the coupling, potentially damaging the worm gear and causing unnecessary power consumption, as well as collisions between components.
Innovation Solution
The proposed solution involves a parking brake apparatus with a motor unit, driving unit, bolt screw, nut screw, cable, and guide pipe, where sensors and stoppers are used to control the operation of the motor unit, preventing excessive tightening by detecting contact and stopping the motor when preset forces or distances are reached, thus preventing damage and unnecessary operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the motor unit operates continuously to tighten the bolt screw and nut screw, then the braking force is improved, but the components may become excessively tightened and damaged
Solution Approach 1:
The stopper is pre-installed at a specific position within the guide pipe to define the maximum movement limit of the bolt screw before damage occurs. This preliminary structural arrangement prevents excessive tightening by physically blocking further movement, resolving the contradiction between achieving sufficient braking force and preventing component damage
Solution Approach 2:
The stopper acts as an intermediary element between the bolt screw and the guide pipe, mediating the interaction by providing a controlled stopping point. This intermediary structure allows the system to achieve the necessary tightening force while preventing excessive force that would cause damage, thus resolving the reliability issue
2Ease of operation
If the motor unit operates to tighten the bolt screw and nut screw, then the braking function is achieved, but the coupling may become impossible to loosen
Solution Approach 1:
The stopper is pre-positioned to define the exact limit of bolt screw movement, ensuring that the coupling is tightened to the optimal point for braking function while maintaining the ability to be loosened. This preliminary structural constraint prevents over-tightening that would make release impossible
Solution Approach 2:
The stopper provides a preliminary counter-action to the tightening force by physically blocking further movement. This anti-action ensures that the coupling reaches the appropriate tightening level for braking while preventing excessive tightening that would prevent loosening, thus resolving the contradiction between braking function and ease of repair
3Strength
If the motor unit operates without control, then the braking force is maximized, but the worm gear may be damaged by impact
Solution Approach 1:
The stopper is pre-installed to define the maximum travel distance of the bolt screw, preventing the worm gear from experiencing impact loads. This preliminary structural arrangement ensures that the motor unit can operate to maximize braking force without risking gear damage from excessive movement or impact
Solution Approach 2:
The stopper provides a cushioning effect by providing a controlled stopping point before impact can occur. This beforehand protective measure allows the system to achieve maximum braking force through motor operation while preventing the harmful impact that would damage the worm gear
4Strength
If the motor unit operates continuously, then the braking force is maintained, but power is consumed unnecessarily
Solution Approach 1:
The stopper is pre-positioned to define the exact point where the braking force is achieved. Once the bolt screw reaches this predetermined position, the motor unit can stop operation, avoiding unnecessary power consumption while maintaining the required braking force. This preliminary structural arrangement enables precise control of motor operation
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 solution effectively prevents the bolt screw and nut screw from becoming excessively tightened, allows for smooth loosening of the coupling, reduces the risk of gear damage, and minimizes power consumption by only operating the motor when necessary, thereby extending the lifespan of components and ensuring proper braking function.
Implementation Method 1
The guide pipe may have an elastic member installed therein so as to block a collision between the cable connection part and the guide pipe
Data Source
AI summary
A parking brake apparatus may include: a motor unit; a driving unit operated by the motor unit; a nut screw rotated by the driving unit; a bolt screw coupled to the nut screw so as to pass through the nut screw, and moved in a longitudinal direction inside the nut screw in connection with the rotation of the nut screw; a cable having one side connected to the bolt screw; a hook part connected to the other side of the cable; and a boot part having an internal space in which the cable and the hook part are moved in the longitudinal direction, and including a stopper arranged on a moving path of the hook part so as to restrict the movement of the hook part.