Door Actuator Cam Disc Distancing Arrangement Wear Reduction
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Solution Overview
Problem
Existing door actuators face challenges in maintaining reliable operation with reduced maintenance and wear, particularly in managing surface loads during specific angles of rotation, which can lead to stressful contact and increased wear.
Innovation Solution
A door actuator design featuring a heart-shaped cam disc with a distancing arrangement that delimits the minimum distance between motion elements at certain angles of rotation, preventing surface loads by ensuring only one contact surface engages with the cam disc in specific ranges, and using springs for energy storage and tensioning to facilitate opening and closing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If two contact surfaces are disposed for rolling on the cam disc, then the door actuator can transfer motion between elements of motion, but high surface loads occur at certain angles of rotation leading to increased wear
Solution Approach 1:
The patent extracts the harmful contact interaction by introducing a distancing arrangement that separates one contact surface from the cam disc at critical angles of rotation. This removes the source of high surface loads while preserving the beneficial motion transfer function through the remaining contact surface.
Solution Approach 2:
The distancing arrangement dynamically adjusts the position of elements of motion based on the angle of rotation. At certain angles, the arrangement actively increases the distance between contact surfaces and the cam disc to prevent harmful contact, while allowing normal operation at other angles.
2Adaptability or versatility
If the cam disc is located between two elements of motion, then motion can be transferred to both elements, but the minimum distance between elements must be maintained to prevent surface loads
Solution Approach 1:
The distancing arrangement serves multiple functions: it maintains the minimum distance between elements of motion, prevents harmful surface loads at critical angles, and allows free movement at other angles. This multi-functionality reduces the need for separate mechanisms.
Solution Approach 2:
The distancing arrangement acts as an intermediary mechanism between the two elements of motion and the cam disc. It mediates the interaction by selectively allowing or preventing contact based on the angle of rotation, thus controlling the motion transfer process.
3Ease of operation
If springs are used for tensioning and energy storage, then the door actuator can facilitate opening and closing, but additional components increase device complexity
Solution Approach 1:
The spring mechanism provides self-service by automatically tensioning and storing energy to facilitate door operation. The spring engages and disengages automatically based on the door's position, eliminating the need for complex control systems.
Solution Approach 2:
The spring is pre-tensioned to store energy before the door operation begins. This preliminary energy storage enables the door to be opened and closed without requiring continuous external power or complex actuation mechanisms.
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
The solution enables reduced wear and maintenance by minimizing surface loads during critical angles of rotation, ensuring reliable operation and extended lifespan of the door actuator, while allowing for efficient pivoting movements of the door leaf.
Implementation Method 1
A translation of the rotary movement of the output shaft into the linear movement of the element of motion and vice versa is realized via the cam disc
Implementation Method 2
the first spring presses the first element of motion in the direction of the cam disc. Upon opening the door leaf, the spring is tensioned. The energy stored thereby in the spring can be employed for moving the first element of motion in the direction of the cam disc and thus for closing the door
Implementation Method 3
the first element of motion includes a first contact surface. The second element of motion includes a second contact surface. Preferably, the two contact surfaces are respectively formed by means of a roller, which is rotationally movably disposed in the element of motion
Data Source
AI summary
A door actuator for opening and/or closing a door leaf includes a housing, an output shaft rotatably supported in the housing and with a cam disc, wherein the output shaft is formed for transferring torque onto the door leaf. A first element of motion is linearly movably guided in the housing with a first contact surface. A second element of motion is linearly movably guided in the housing with a second contact surface. A distancing arrangement is disposed in the housing. The cam disc is disposed between the two contact surfaces and for rolling on the two contact surfaces. In at least one delimiting range of angles of rotation of the output shaft, the distancing arrangement delimits the minimum distance between the elements of motion, and, in at least one free range of angles of rotation, does not delimit the linear mobility of the two elements of motion in relation to each other.