Undulated Annular Motion Converter for Low-Vibration Reciprocation
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Solution Overview
Problem
The complexity and large number of moving parts in traditional piston—piston rod—crank mechanisms lead to inefficiencies and vibrations, with challenges in balancing and achieving efficient combustion and fluid flow control in engines, particularly at Top Dead Centre (TDC) and Bottom Dead Centre (BDC) positions.
Innovation Solution
A mechanism transforming reciprocal to rotational motion or vice versa using annular components with smooth undulated surfaces, allowing for continuous contact and dynamic lubrication, minimizing friction and wear, and enabling delayed motion inversion at extreme positions without a crankshaft or piston rod, integrated with simple valve configurations for fluid flow control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a piston—piston rod—crank mechanism is used for motion transformation, then reliable motion conversion is achieved, but the device complexity and number of moving parts increase
Solution Approach 1:
The patent merges the functions of the piston, piston rod, and crank mechanism into a single integrated oscillating component. The piston directly oscillates without requiring separate connecting rods or crankshafts, thereby reducing the number of moving parts while maintaining reliable motion conversion between reciprocating and rotational movements.
Solution Approach 2:
The oscillating component performs multiple functions simultaneously: it acts as both the piston (controlling fluid flow) and the crank mechanism (converting motion). This multi-functionality eliminates the need for separate dedicated components for each function, reducing overall device complexity.
2Reliability
If a piston—piston rod—crank mechanism is used, then motion transformation is achieved, but vibrations and inertial forces increase
Solution Approach 1:
Instead of using a traditional crank mechanism that generates vibrations through rotating不平衡 masses, the patent inverts the approach by using a direct oscillating piston that moves symmetrically. This symmetric reciprocating motion reduces inertial forces and vibrations while still achieving the required motion transformation.
3Productivity
If a traditional piston mechanism is used, then combustion process is maintained, but the piston cannot rest at TDC and BDC for adequate time
Solution Approach 1:
The patent introduces a dwell mechanism that dynamically adjusts the piston's motion profile, allowing it to remain stationary at TDC and BDC for specific time intervals. This dynamic control of the motion cycle enables adequate combustion time and exhaust flushing while maintaining overall productivity.
4Ease of operation
If complex valve mechanisms are used for fluid flow control, then precise control is achieved, but device complexity increases
Solution Approach 1:
The patent extracts the valve mechanism from the traditional complex assembly and integrates it directly into the oscillating piston structure. The piston itself or its associated components perform the valve function, eliminating separate complex valve mechanisms while maintaining precise fluid flow control.
Solution Approach 2:
The valve function is merged with the piston's oscillating motion. The piston's position and movement naturally control fluid flow through integrated ports and passages, combining the functions of motion transformation and fluid control into a single component system.
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 reduces the number of moving parts, minimizes friction and wear, and enhances efficiency by allowing harmonic reciprocation and delayed motion inversion, resulting in a more compact and efficient engine design with improved combustion and fluid flow control.
Implementation Method 1
there is free space left between the undulated surfaces, resulting, when lubricated, in achieving friction and wear minimization owing to dynamic lubrication
Data Source
AI summary
Mechanism for transforming rotating to reciprocating motion, or vice versa, comprising a first annular component (1) and a second annular component (3) coaxially located, the first beside the second, along a longitudinal axis (ΔA), wherein both are able to rotate around the longitudinal axis and to reciprocate along the longitudinal axis, wherein aide (A) of the first annular component (1) adjacent to the second annular component (3) is in continuous contact, in at least one point, with the neighbouring side (Γα) of the second annular component (3), such that the second annular component (3) is able to rotate relative to the first annular component (1) in continuous contact in at least one point with the adjacent side (A) of the first annular component (1), wherein the contacting sides are undulated surfaces (A, Γα), such that if the first annular component (1) and the second annular component (3) are forced into rotational motion relative to each other, remaining the same time in continuous contact, then every point of the undulated surfaces (A, Γα) will trace, relative to the other, an undulated trajectory and at the same will also execute, relative to the other, reciprocating motion.