Vehicle Door Arresting System Using Cam-Driven Brake Shoe
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Solution Overview
Problem
Existing arresting systems for swiveling vehicle doors are limited by the use of electromagnets, which require high manufacturing precision, are costly, and have restricted design flexibility due to their large size and weight, and are susceptible to environmental factors like dust and water.
Innovation Solution
The system employs an electric motor with an actuation cam to drive a brake-shoe element, allowing for a lighter, more compact design that can be adapted to various installation spaces, using commercially available motors with integrated gears to reduce costs and improve reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If an electromagnet is used to drive the brake-shoe element, then the braking force can be amplified, but the device requires large inherent weight and large dimensions
Solution Approach 1:
The patent replaces the electromagnet-driven mechanical system with a cam mechanism. The cam profile is designed to convert rotational motion into linear motion of the brake shoe, providing the necessary braking force without requiring a heavy electromagnet. This mechanical substitution resolves the contradiction by achieving force amplification through cam geometry rather than electromagnetic force.
Solution Approach 2:
The cam mechanism utilizes curved surfaces and profiles to achieve mechanical advantage. The cam profile's geometry transforms rotational motion into the desired linear motion of the brake shoe, providing force amplification without the weight penalty of an electromagnet. The curved cam surface enables smooth force transmission and control.
2Force
If an electromagnet is used to drive the brake-shoe element, then the braking force can be amplified, but the device has large dimensions
Solution Approach 1:
The patent replaces the bulky electromagnet with a compact cam mechanism. The cam, driven by a small motor or manual actuation, provides the necessary force amplification through its geometric profile. This substitution dramatically reduces the volume required for the actuating mechanism while maintaining the ability to generate sufficient braking force.
Solution Approach 2:
The cam's curved profile enables compact design by efficiently converting rotational motion into linear brake shoe movement. The geometric design of the cam allows for force multiplication in a small package, resolving the contradiction between achieving adequate braking force and minimizing device volume.
3Reliability
If a small air gap is used between the electromagnet and actuation element, then the electromagnet can function fully, but the system has high susceptibility to dust, oil, or water
Solution Approach 1:
The patent eliminates the electromagnet and its associated air gap requirements by using a cam mechanism. This mechanical system has no sensitivity to dust, oil, or water in the same way electromagnetic systems do. The cam profile maintains reliable mechanical contact without requiring precise air gap control, resolving the contradiction between electromagnetic reliability and environmental susceptibility.
4Reliability
If the position of the electromagnet is preset by the direction of motion of the brake-shoe element, then the electromagnet can function, but the design freedom is heavily restricted
Solution Approach 1:
The patent replaces the electromagnet with a cam mechanism that can be positioned and oriented more flexibly. The cam can be designed with various profiles and mounted in different orientations to suit different installation spaces and motion requirements. This substitution provides significantly greater design freedom while maintaining reliable actuation of the brake shoe.
Solution Approach 2:
The cam mechanism allows for dynamic adjustment of the brake shoe position through different cam profiles and rotation angles. This enables the system to adapt to various installation configurations and motion requirements, providing the design flexibility that was restricted when using a preset electromagnet position.
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 provides a cost-effective, reliable, and adaptable arresting system that ensures smooth operation by leveraging the design freedom of electric motors and actuation cams, reducing weight and size while maintaining robustness and resistance to environmental factors.
Implementation Method 1
The drive is an electric motor that directly or indirectly drives an actuation element in rotation
Implementation Method 2
the actuation element is equipped with at least one actuation cam that acts directly or indirectly on the at least one brake-shoe element
Implementation Method 3
the brake-shoe element is arranged inside the housing and can be activated with the brake rod upon exertion of a braking force
Data Source
AI summary
Disclosed is an arresting system for arresting a swivel motion between two swivel-mounted elements, including a brake rod connected to the first element, an arresting device on the second element with a housing, through which the brake rod extends, in which case the arresting device has a drive and at least one brake-shoe element that can be moved via the drive relative to the brake rod. The brake-shoe element is inside the housing and engageable with the brake rod upon exertion of a braking force. Included are a sensor, and an electronic device controlling braking force exerted by the brake-shoe element on the brake rod depending on the signals from the sensor. The drive is an electric motor driving in rotation an actuation element that, to produce the relative motion between the brake-shoe element and the brake rod, has an actuation cam acting on the brake-shoe element.