Variable Compression Engine Block Cover Worm Drive
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Solution Overview
Problem
Conventional compression ratio variable devices for engines are cumbersome due to the increased number of components and weight, leading to inefficient torque transfer and larger layout volumes, which limits their effectiveness in varying compression ratios for improved efficiency and noise reduction.
Innovation Solution
A simplified engine design that integrates a block cover and shaft cap, eliminating the need for a separate cap to fix the control shaft, using a worm wheel and motor positioned outside the block cover to effectively transfer torque and vary the distance between the piston and crank pin, reducing component count and weight while enhancing torque transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate shaft cap is used to fix the control shaft on the engine block, then the control shaft can be securely fixed, but the number of components and weight increase
Solution Approach 1:
The shaft cap function is merged into the block cover. The block cover now serves dual purposes: covering the shaft cap and control shaft, and fixing the control shaft through an integrated fixing structure. This eliminates the separate shaft cap component while maintaining secure fixation of the control shaft.
2Power
If the control motor is disposed at one end portion of the block cover, then the block cover can accommodate the motor, but the layout volume increases and driving torque transfer becomes inefficient
Solution Approach 1:
The control motor is repositioned from an end portion location to a central location on the block cover. This spatial reconfiguration in a different dimensional arrangement allows the motor to be centrally positioned, optimizing torque transfer to the control shaft while reducing the overall layout volume required.
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 the number of components and weight, simplifies the layout, and effectively transfers motor torque to the control shaft, enabling efficient compression ratio adjustment and improved engine performance with reduced noise and vibration.
Implementation Method 1
a worm connected to the motor portion is mounted to the block cover by penetrating the block cover, the worm being engaged with the worm wheel so as to rotate the control shaft according to the motor portion
Data Source
AI summary
An engine may include a crankshaft, a piston, a connecting rod that connects a crank pin of the crankshaft with the piston, and a compression ratio variable device that varies a distance between the piston and the crank pin, wherein the compress ratio variable device includes: a block cover mounted on an outside of the engine block and a cover journal portion and a worm wheel mounting space are formed therein, a control shaft contacting the cover journal portion and an operating arm protruding from an exterior circumference of the control shaft, and a motor portion, wherein a worm connected to the motor portion is mounted to the block cover, the worm being engaged with the worm wheel so as to rotate the control shaft according to the motor portion, wherein a distance between the piston and the crank pin is varied by a rotation of the control shaft.