Internal Combustion Engine Gear Rack Torque Transmission
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Solution Overview
Problem
Internal combustion engines operate at low efficiency due to incomplete torque transmission from the piston and significant energy loss in exhaust gases, primarily attributed to the circular movement of the crankshaft arm.
Innovation Solution
An improved internal combustion engine design incorporates a standard connecting rod and a gear rack that reciprocates with the piston, engaging with a gear on the crankshaft via a one-way drive mechanism for square torque transmission, ensuring torque is only transmitted during the power stroke and allowing relative rotation during the return stroke.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a standard connecting rod with circular crankshaft arm movement is used, then the engine structure is simple, but torque transmission from the piston is incomplete and efficiency is low
Solution Approach 1:
The patent divides the torque transmission function into two separate mechanisms: a connecting rod for basic motion conversion and a gear rack for optimized torque transmission. This segmentation allows each component to specialize in its function, with the gear rack providing square torque transmission during the power stroke while the connecting rod handles the reciprocating motion conversion, thereby improving overall engine efficiency without creating an overly complex integrated mechanism
Solution Approach 2:
The gear rack acts as an intermediary mechanism between the piston and the crankshaft. It translates the linear reciprocating motion of the piston into rotational motion of the crankshaft through gear engagement, providing a mediating function that optimizes torque transmission. This intermediary approach allows the system to achieve better torque transmission characteristics than a direct connecting rod-to-crankshaft connection while maintaining structural manageability
2Loss of energy
If the gear rack engages the gear continuously, then torque is transmitted during both power stroke and return stroke, but energy is wasted during the return stroke when torque should not be transmitted
Solution Approach 1:
The one-way drive mechanism dynamically controls the engagement between the gear rack and the gear, allowing torque transmission only during the power stroke when energy should be captured. During the return stroke, the mechanism automatically disengages, preventing energy waste. This dynamic control adapts the transmission system's state based on the operational phase, improving energy efficiency while maintaining reasonable structural complexity through the use of standard one-way clutch mechanisms
3Productivity
If the diameter of the gear is made equal to two times the length of the crank arm, then square torque transmission is achieved, but the spatial requirements and manufacturing precision increase
Solution Approach 1:
The patent specifies a particular geometric relationship where the gear diameter equals two times the crank arm length. This parameter change creates optimal conditions for square torque transmission, where the torque curve becomes more uniform throughout the power stroke. While this does increase manufacturing precision requirements, the use of standard gear manufacturing processes and the clear geometric relationship facilitate practical implementation
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 engine efficiency and torque transmission, reducing energy loss by optimizing the conversion of reciprocating piston motion into rotary motion, thereby improving overall engine performance.
Implementation Method 1
a one-way drive mechanism is provided between the gear and the crankshaft that transmits torque (i.e. rotary force) from the gear rack to the crankshaft only during the power stroke of the piston
Implementation Method 2
The gear rack is engaged with a gear that is mounted on the crankshaft
Implementation Method 3
a gear rack is provided that has an end that is connected to the piston so that the gear rack reciprocates with the piston
Implementation Method 4
drives a rotatable crank mechanism to convert the reciprocating motion of the piston into rotation of the crankshaft
Data Source
AI summary
An internal combustion engine includes a standard connecting rod as well as a gear rack. The connecting rod can be a standard connecting rod that reciprocates with the piston and that drives a rotatable crank mechanism to convert the reciprocating motion of the piston into rotation of the crankshaft. The gear rack is also connected to and reciprocates with the piston. The gear rack is engaged with a gear that is mounted on the crankshaft. A one-way drive mechanism is provided between the gear and the crankshaft that transmits torque (i.e. rotary force) to the crankshaft only during the power stroke of the piston.