Pivoting Two-Rod Piston Assembly for Lower Rotation Resistance
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Solution Overview
Problem
Conventional internal combustion engines face inefficiencies due to the single connecting rod design, which results in increased rotation resistance and energy loss, particularly at the 12 o'clock and 6 o'clock positions.
Innovation Solution
The piston assembly incorporates an upper rod fixed relative to the piston head and a lower rod that pivots about the upper rod, allowing for a shorter lever length and improved mechanical advantage, thereby reducing the force required to move the piston head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single connecting rod design is used, then the structure is simple, but rotation resistance increases and energy is lost
Solution Approach 1:
The single connecting rod is divided into two separate rods: a first connecting rod connected to the piston head and a second connecting rod connected to the crankshaft. This segmentation allows each rod to be optimized for its specific function, reducing overall energy loss while maintaining structural simplicity.
Solution Approach 2:
A pivot mechanism is introduced as an intermediary between the two connecting rods. This pivot allows rotational movement and serves as a mediator that transfers force efficiently between the piston-driven first rod and the crankshaft-driven second rod, reducing energy loss during transmission.
2Device complexity
If a single connecting rod design is used, then the structure is simple, but rotation resistance increases
Solution Approach 1:
Dividing the single connecting rod into two separate rods reduces rotation resistance by allowing each rod to rotate independently about its own axis, rather than requiring the entire assembly to rotate as one rigid unit.
Solution Approach 2:
The pivot connection between the two rods introduces dynamic rotational freedom, allowing the system to adapt its configuration during operation. This dynamic capability reduces rotation resistance by enabling the rods to rotate and adjust to varying force directions.
3Device complexity
If the lever length is not optimized, then the mechanical advantage is reduced, but the structure remains simple
Solution Approach 1:
The first connecting rod is designed with a specific length optimized for transmitting force from the piston head, while the second connecting rod has a different length optimized for connecting to the crankshaft. This local optimization of each rod's dimensions maximizes the overall mechanical advantage of the system.
Solution Approach 2:
By changing the parameters (lengths) of the two connecting rods independently, the system achieves optimal mechanical advantage. The first rod can be longer to provide better leverage from the piston, while the second rod can be shorter to optimize crankshaft connection, creating a parameter-optimized configuration.
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 design reduces rotation resistance, allowing more energy to be maintained through the piston assembly's strokes, leading to a more efficient engine operation with improved power and reduced emissions.
Implementation Method 1
allowing for a shorter lever length and improved mechanical advantage, thereby reducing the force required to move the piston head
Data Source
AI summary
A piston assembly includes a piston head for reciprocating back and forth within a cylinder of an engine, an upper rod coupled to the piston head at one longitudinal end of the upper rod and fixed relative to the piston head, and a lower rod rotatably coupled to an opposite longitudinal end of the upper rod, the lower rod configured to pivot about the opposite longitudinal end of the upper rod. The lower rod is configured to couple to a crankshaft at a longitudinal end of the lower rod opposite the upper rod. Methods of forming a piston assembly and engines incorporating such piston assemblies are also disclosed.