Compression Release Engine Brake Socket Module Design
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Solution Overview
Problem
Conventional compression release type engine brakes face issues with increased overall size due to the need for an external reset bracket to exhaust engine brake oil, leading to potential contact between the exhaust valve and engine piston and uneven wear from the adjusting screw.
Innovation Solution
A socket module with a housing, brake piston, and reset member that automatically exhausts brake oil by using a check valve and reset spring mechanism, ensuring constant valve lift and preventing contact between the exhaust valve and engine piston, while a rounded groove in the housing adjusts the exhaust rocker arm rotation to prevent uneven wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an external reset bracket is used to exhaust engine brake oil, then the brake oil can be discharged, but the overall size of the engine brake increases
Solution Approach 1:
The reset member is integrated into the socket module, merging the reset function with the existing socket structure. This eliminates the need for a separate external reset bracket, thereby reducing the overall size while maintaining the brake oil discharge capability.
Solution Approach 2:
The reset member is nested within the socket module housing, with the reset valve and spring contained inside the existing structure. This nested arrangement allows the reset function to be housed within the existing volume, avoiding additional external components.
2Ease of operation
If brake oil is introduced into the socket module, then the exhaust valve can be opened at the end of compression stroke, but the brake oil is not exhausted and causes excessive valve opening
Solution Approach 1:
The reset member is pre-configured with the reset valve and spring mechanism to automatically activate at the appropriate time. The reset valve is positioned and spring-loaded to open at the predetermined moment, ensuring timely brake oil discharge before the exhaust valve operation completes.
Solution Approach 2:
The reset mechanism uses a push pin that responds to the position of the exhaust rocker arm to trigger the reset valve opening. This feedback mechanism ensures the brake oil is discharged at the correct moment based on the actual operational state of the valve train.
3Ease of operation
If the adjusting screw is used to mount the exhaust rocker arm, then the rocker arm can be positioned, but uneven wear occurs on the housing
Solution Approach 1:
The mounting groove is formed with a rounded curvature instead of a sharp corner, allowing the adjusting screw to rotate within the groove. This curved path distributes the wear across the entire groove circumference rather than concentrating it at a single point, significantly extending the housing service life.
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 solution reduces the risk of contact between the exhaust valve and engine piston, maintains constant valve lift, and prevents uneven wear, thereby enhancing the braking performance and reducing the overall size and weight of the engine brake system.
Implementation Method 1
a check valve that is disposed in the receiving groove, and opens and closes the inlet by being elastically supported by a check spring
Implementation Method 2
a reset spring that elastically supports a lower portion of the reset valve, and when the push pin pushes the reset valve, brake oil is discharged
Implementation Method 3
the brake piston moves downward to eliminate the gap between the exhaust rocker arm and the exhaust cam
Data Source
AI summary
A socket module for a compression release engine brake is provided between an exhaust rocker arm rotating with respect to a rocker arm shaft and a valve bridge in contact with an exhaust valve of an engine. In particular, the socket module includes: a housing which includes an inlet through which brake oil is introduced, a brake piston mounting portion, and a reset member mounting portion communicated with the brake piston mounting portion; a brake piston that is provided to be movable in the brake piston mounting portion; and a reset member that is provided in the reset member mounting portion and that discharges brake oil by selectively contacting a push pin coupled to an upper portion of a cylinder head of the engine.