End-Face Control Piston Valve for Adjustable Connecting Rods
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Solution Overview
Problem
Existing longitudinally adjustable connecting rods for piston engines face challenges in installation space constraints, material fatigue under high pressures, and the complexity of hydraulic control systems, which affect their reliability and efficiency.
Innovation Solution
A longitudinally adjustable connecting rod design featuring a control slide with an end-face control piston and a simple hydraulic control valve configuration, including a control pressure surface, outlet valves, and a return spring, which enables precise control and reduces the complexity of the hydraulic control device, allowing for reliable operation and compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional hydraulic control device with complex valve configuration is used, then the control function is achieved, but the device complexity and installation space requirements increase
Solution Approach 1:
The control piston is integrated directly into the control slide as a single unified component rather than separate parts. The control piston forms an integral part of the control slide body, eliminating the need for separate piston assemblies and reducing the number of moving parts in the hydraulic control system.
Solution Approach 2:
The control slide serves multiple functions: it acts as both the sliding control element and houses the integrated control piston. The control slide with integrated piston performs both the sliding motion control and the hydraulic pressure control functions within a single component structure.
2Manufacturing precision
If high-pressure hydraulic control is used for connecting rod adjustment, then the adjustment precision is improved, but material fatigue and component durability decrease
Solution Approach 1:
The patent uses hydraulic pressure applied to the control piston to achieve precise control of the control slide position. The hydraulic system provides smooth, controlled force application that enables precise connecting rod length adjustment without requiring excessive mechanical forces that would cause material fatigue.
3Adaptability or versatility
If multiple hydraulic components and valves are used for control, then the control function is achieved, but the installation space and weight increase
Solution Approach 1:
The control piston and control slide are merged into a single integrated component. The control piston is formed as an integral part of the control slide body, eliminating separate piston housings, seals, and mounting structures that would occupy additional space.
Solution Approach 2:
The control piston is nested within the control slide structure. The piston is positioned within the sliding body, utilizing the existing structural space rather than requiring separate external mounting space for additional components.
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 the reliability and efficiency of the connecting rod by simplifying the hydraulic control system, reducing material requirements, and minimizing the negative effects of inertia and mass forces, leading to improved operational stability and reduced manufacturing costs.
Implementation Method 1
the control slide comprises a control piston (37) which is arranged on the end face and which has a control pressure surface (46) which can be subjected to the control pressure and which defines a control pressure chamber (38) in the control cylinder (36)
Implementation Method 2
a return spring (32) which acts on the control slide (35) and which causes the control slide (35) to return into an initial position
Data Source
AI summary
A longitudinally adjustable connecting rod for a piston engine, where the connecting rod includes a first connecting rod end for receiving a piston pin and a second connecting rod end for receiving a crankshaft journal, where the distance between the piston pin and the crankshaft journal is adjustable in the longitudinal direction (A) of the connecting rod by way of a hydraulic control device with a hydraulic control valve. The hydraulic control valve comprises a control cylinder and a control slide which is guided in a slidable manner in the control cylinder and which can be pressurized, and at least one outlet valve which can be actuated by the control slide. The control slide comprises a control piston which is arranged on the end face, with a control pressure surface which can be subjected to the hydraulic control pressure and which defines a control pressure chamber in the control cylinder. The use of such a longitudinally adjustable connecting rod with a hydraulic control device in a piston engine as well as a corresponding piston engine is also provided.