Compression Release Engine Brake Shaft Spring Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Compression release type engine brakes face issues with premature valve opening due to unexhausted brake oil, leading to potential contact between the exhaust valve and piston, and require external reset brackets increasing overall size, while the contact characteristic between the screw and brake module is crucial for normal operation.
Innovation Solution
An engine brake apparatus with a shaft spring supporting the exhaust rocker arm, which pushes the rocker arm in the axial direction, eliminating the need for a rocker arm spacer and enhancing the contact characteristic between the screw and brake module by adjusting the distance between units, and includes a coil spring wound around the rocker arm shaft with an extension to press a rocker arm protrusion, maintaining constant distance and robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reset bracket is applied externally to the brake module to exhaust brake oil, then the valve opening control is improved, but the overall size of the engine brake increases
Solution Approach 1:
The reset bracket is integrated with the brake module by forming a reset bracket protrusion that fits into a reset bracket recess within the brake module housing. This merging of components allows the brake oil exhaustion function to be incorporated internally, eliminating the need for external reset brackets and reducing the overall size while maintaining reliable valve opening control
2Adaptability or versatility
If the contact characteristic between the screw and brake module is weakened, then the adjustment flexibility is improved, but the operational reliability deteriorates due to gaps
Solution Approach 1:
The screw thread pitch is specifically designed with a pitch of 1.5mm to optimize the contact characteristic between the screw and brake module. This parameter change ensures sufficient contact pressure for reliable operation while maintaining adequate adjustment flexibility through the threaded mechanism
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
The shaft spring enhances the contact characteristic between the screw and brake module, prevents premature valve opening, and maintains operational reliability by eliminating the need for a rocker arm spacer, ensuring consistent braking performance and reducing the risk of piston contact.
Implementation Method 1
a shaft spring mounted between the first opening unit and the second opening unit, and wherein a rocker arm protrusion is formed in the exhaust rocker arm of at least one of the first opening unit and the second opening unit, and the shaft spring presses the rocker arm protrusion
Implementation Method 2
The shaft spring may include a coil portion wound around the rocker arm shaft, and an extension formed extending from the coil portion and pressing the rocker arm protrusion
Data Source
AI summary
A compression release type engine brake includes a first opening unit and a second opening unit each including an exhaust rocker arm, an adjusting screw provided at an end portion of the exhaust rocker arm, a brake module in which brake oil is selectively and a brake piston mount portion is formed therein, a brake piston which is selectively protruded according to the oil supply inside the brake module, a reset member selectively exhausting the oil in the brake module, and a valve bridge connected to the brake piston and provided with an exhaust valve, and wherein a rocker arm protrusion is formed in the exhaust rocker arm of at least one of the first opening unit and the second opening unit, and the shaft spring presses the rocker arm protrusion and adjusts a distance between the first opening unit and the second opening unit.