Coaxial Non-Return Rotation Transmission With Cam Locking
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Solution Overview
Problem
Existing rotation transmitting devices are hindered by friction and require external energy for non-return functions, lacking robustness and adaptability in transmitting rotational movement between shafts.
Innovation Solution
A non-return device with a cam-based locking mechanism that radially translates between locking and unlocking positions, utilizing a cam on the input shaft to switch the locking element and an elastic return mechanism to ensure secure rotation transmission between coaxial shafts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If friction-based non-return devices are used, then rotation transmission in one direction is enabled, but system operation is hindered and robustness of stop elements is reduced
Solution Approach 1:
The patent replaces friction-based mechanical non-return mechanisms with a cam-based positive engagement system. The cam profile geometrically controls the locking element to engage and disengage at specific rotation positions, eliminating reliance on friction while providing robust, predictable non-return functionality through mechanical geometry rather than surface interaction.
Solution Approach 2:
The locking element is automatically actuated by the cam profile during normal input shaft rotation without requiring external control systems. The cam's geometric profile self-regulates the locking and unlocking timing based on the rotation angle, making the system self-controlling and eliminating the need for external energy input or complex control mechanisms.
2Reliability
If known non-return devices are used, then rotation transmission is achieved, but external energy input is required
Solution Approach 1:
The cam mechanism converts the rotational motion of the input shaft directly into the radial motion of the locking element through its geometric profile. The system uses the kinetic energy already present in the rotating input shaft to automatically actuate the locking and unlocking sequence, requiring no external energy source while maintaining reliable non-return functionality.
Solution Approach 2:
The locking element transitions dynamically between locked and unlocked states based on the instantaneous position of the cam profile during rotation. This dynamic engagement allows the system to adapt its locking state continuously during the rotation cycle, enabling non-return function without external energy input by utilizing the natural dynamics of the rotating cam mechanism.
3Reliability
If locking elements are used to prevent rotation, then non-return function is achieved, but device complexity increases
Solution Approach 1:
The cam profile integrates multiple functions into a single geometric element: it transmits rotation from the input shaft, controls the timing of locking element engagement, and regulates the unlocking sequence. By merging these functions into the cam's geometry rather than using separate actuators and control mechanisms, the patent reduces overall device complexity while maintaining reliable non-return operation.
Solution Approach 2:
The cam mechanism serves multiple purposes simultaneously: it acts as a rotation transmitter, a timing controller for the locking element, and a positional regulator. This multi-functionality eliminates the need for separate dedicated components for each function, simplifying the overall device structure while achieving robust non-return functionality.
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
Enables robust, adaptable, and compact mechanical transmission of rotational movement with simultaneous unlocking and locking, allowing axial rotation while preventing heterokinetic rotation, thus enhancing system operation without external energy input.
Implementation Method 1
the switching means of the locking element include a cam having a profile designed to move the locking element radially during a rotation of the input shaft
Implementation Method 2
the elastic return means to the locking position of the locking element include a spring connected to the frame
Data Source
AI summary
A non-return device for coaxial rotation transmission includes coaxial input and output shafts, a frame for guiding the rotation of the shafts. A locking element is urged in radial translation through a channel of the output shaft between a radial locking position, in which the locking element projects from the channel so as to prevent a rotation of the output shaft by abutting against the frame, and a radial unlocking position, in which the locking element is retracted so as to allow axial rotation of the output shaft. The input shaft includes means for radially switching the locking element between the locking and unlocking positions thereof.