Stationary Retaining Element for Reciprocating Piston Valve Actuation
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Solution Overview
Problem
Conventional retaining devices for gas exchange valves in reciprocating-piston machines increase wear and energy requirements due to moving masses and complex construction, making them inefficient and costly.
Innovation Solution
The counter-surface and guide surface are fixed to the machine housing, allowing the retaining element to remain stationary, reducing moved masses and simplifying the construction by using a stationary annular piston with a pressure chamber connected hydraulically or pneumatically for actuation, and incorporating a compression spring for deflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the retaining device uses a piston guided in the valve stroke transmission device, then the valve closing time can be changed, but the moved masses increase leading to increased wear and energy requirements
Solution Approach 1:
Instead of guiding the piston in the moving valve stroke transmission device as in conventional solutions, the patent inverts the approach by fixing the guide surfaces to the stationary housing and allowing the retaining element to remain stationary. This inversion eliminates the piston from moving with the valve transmission device, thereby reducing moved masses while maintaining valve closing time control functionality.
2Reliability
If the retaining device uses a piston guided in the valve stroke transmission device, then the valve closing time can be changed, but the construction effort increases
Solution Approach 1:
The patent simplifies construction by inverting the conventional arrangement: instead of a moving piston guided in the valve transmission device, it uses a stationary retaining element with guide surfaces fixed to the housing. This reduces construction effort while achieving the same valve retention function.
Solution Approach 2:
The patent extracts the piston from the moving valve stroke transmission device and leaves it stationary in the housing. This separation removes the complex interaction between moving retaining components and valve transmission parts, simplifying the overall construction.
3Area of stationary object
If the retaining element is formed by an annular piston, then the area required can be reduced to a minimum
Solution Approach 1:
The patent employs an annular piston design where the retaining element is formed as a ring-shaped component that can be concentrically arranged with the valve stroke transmission element. This nested configuration minimizes the area required for the retaining element while maintaining structural integrity and functional effectiveness.
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 solution reduces wear and energy consumption while providing a simpler, more compact design with minimized area requirements, enabling efficient valve retention and power transmission with low loss.
Implementation Method 1
the pressure chamber can be hydraulically or pneumatically connected to a pressure source via at least one first valve
Implementation Method 2
the pressure chamber can be hydraulically or pneumatically connected to a pressure source via at least one first valve
Implementation Method 3
the retaining element can be deflected by applying pressure to the pressure chamber against a restoring force, preferably formed by a spring
Data Source
AI summary
The invention relates to a reciprocating-piston machine, comprising a valve actuation device for at least one gas exchange valve, at least one valve stroke transmission device, which has at least one valve stroke transmission element, which is arranged between the gas exchange valve and the camshaft and which is mounted for movement between a first Position associated with a closed Position of the gas exchange valve and a second Position associated with an open position of the gas exchange valve, at least one halting device having a halting element mounted for movement between an actuation position and a release position in a machine housing or a housing-fixed component parallel to a guiding surface of the first valve stroke transmission element that the halting element at least shows the displacement motion of the first valve stroke transmission element and releases said displacement motion in the release position.