Reciprocating Engine Dual Gear Rack Pinion Torque Loss
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Solution Overview
Problem
Reciprocating engines experience significant torque loss at the top-dead-center (TDC) position of pistons, which reduces power and efficiency, as the force applied to the piston at this position does not transmit torque to the crankshaft, necessitating compensation with flywheels and synchronized multi-cylinder designs.
Innovation Solution
A reciprocating engine design incorporating a dual gear rack and pinion gear system, where a timing arm with a timing pin interacts with an elliptical timing slot, allowing the dual gear rack to reciprocate and rotate the output shaft, ensuring continuous torque transmission by alternating engagement with gear rack teeth, thereby reducing torque loss at TDC positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a conventional crankshaft mechanism is used, then the engine structure is simple, but torque is lost at top-dead-center positions
Solution Approach 1:
The gear rack is divided into two separate racks (first gear rack and second gear rack) positioned on opposite sides of the output shaft. This segmentation allows each rack to engage with the pinion gear alternately during different phases of the reciprocating stroke, ensuring continuous torque transmission while maintaining structural simplicity
Solution Approach 2:
The mechanism employs periodic engagement where the first gear rack teeth mesh with the pinion gear during one direction of motion, and the second gear rack teeth mesh during the opposite direction. This periodic action ensures that torque is continuously transmitted through the output shaft throughout the entire reciprocating cycle, eliminating the torque loss that occurs at dead center positions in conventional engines
2Power
If flywheels are used to compensate for torque loss, then torque continuity is improved, but the device complexity and energy loss increase
Solution Approach 1:
The invention extracts and eliminates the need for flywheels by directly addressing the root cause of torque discontinuity. The dual gear rack system inherently provides continuous torque transmission through alternating engagement, removing the requirement for energy-storing components like flywheels and their associated complexity
Solution Approach 2:
The pinion gear acts as an intermediary element that translates the reciprocating linear motion of the dual gear racks into continuous rotational motion of the output shaft. This intermediary mechanism ensures smooth torque transmission without the need for energy-storing devices, directly converting back-and-forth motion into unidirectional rotation
3Power
If multi-cylinder engines are designed with synchronized timing, then power delivery is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The invention merges the functions of multiple cylinders into a single reciprocating assembly where both cylinders share a common output shaft and dual gear rack system. This consolidation maintains continuous power delivery while simplifying the synchronization mechanism, as the alternating engagement of the dual gear racks naturally coordinates the power delivery from both cylinders without requiring complex timing 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
This design enhances power and efficiency by maintaining torque transmission across the entire piston stroke, reducing the reliance on flywheels and synchronized cylinder timing, leading to improved engine performance.
Implementation Method 1
The first gear rack teeth are configured to mesh with the teeth of the pinion gear, causing the output shaft to rotate as the dual gear rack moves towards the upper wall of the engine mainframe
Implementation Method 2
The timing plate defines a timing slot that has an elliptical shape and is engaged by the timing pin of the timing arm as the timing arm rotates with the output shaft
Data Source
AI summary
Reciprocating engines and methods of their operation of. Pistons of such an engine are interconnected through a pinion gear and dual gear rack of a reciprocating assembly in a manner capable of reducing the loss of torque at the top-dead-center (TDC) positions of the pistons.