Valve for Single-Acting Cylinder with Pneumatic Stroke Limiting
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Solution Overview
Problem
Existing valves for hydraulic cylinder groups in vehicles with tipper bodies are difficult to install and require specific conduit designs, leading to improper interactions with movable members, and lack a simple and cost-effective solution for controlling oil flow.
Innovation Solution
A valve with a limiting device that interacts with fixed abutment elements to actuate a pneumatic drive, blocking the cylinder stroke at a predefined angle, and a relief valve that intervenes when pressure exceeds a certain value, using a sliding actuating element and springs to control the shutter and discharge oil effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional valves are used for hydraulic cylinder groups in tipper bodies, then the oil flow control function is provided, but the installation becomes difficult and requires specific conduit designs that prevent proper interaction with movable members
Solution Approach 1:
The patent combines the valve body with integrated pneumatic conduits and limiting device into a single assembled unit that mounts directly to the cylinder. This merging of components eliminates the need for separate conduit installations and simplifies the overall installation process while maintaining proper interaction with movable members through the integrated design.
Solution Approach 2:
The valve assembly serves multiple functions simultaneously: it controls oil flow to the hydraulic cylinder, provides pneumatic actuation for the shutter, and includes a limiting device for stroke control. This multi-functionality in a single assembly reduces the number of separate components needed and simplifies installation.
2Reliability
If conventional valves are used for hydraulic cylinder groups in tipper bodies, then the oil flow control function is provided, but the interaction with movable members becomes improper
Solution Approach 1:
By integrating the pneumatic conduits and limiting device directly into the valve body assembly, the patent ensures proper spatial relationships and interactions with movable members are built into the design. This eliminates improper interactions that occur with separate conventional components.
3Reliability
If a limiting device is added to control cylinder stroke, then the stroke limitation function is achieved, but the device complexity increases
Solution Approach 1:
The limiting device is integrated into the valve body as a combined assembly rather than a separate component. This merging reduces overall system complexity while maintaining reliable stroke control through the interaction between the limiting device and fixed abutment elements.
Solution Approach 2:
The limiting device operates automatically through mechanical interaction with fixed abutment elements on the vehicle body. The pneumatic pressure itself activates the limiting function without requiring external control systems, making the device self-regulating.
4Reliability
If a relief valve is added to manage pressure, then the pressure safety function is achieved, but the device complexity increases
Solution Approach 1:
The relief valve is integrated into the valve body as a combined assembly, eliminating the need for separate pressure relief components. This merging maintains pressure safety functionality while reducing overall system complexity.
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 allows for easy installation and effective control of oil flow, preventing over-extension of the hydraulic cylinder and safely managing pressure, thus enhancing the versatility and cost-effectiveness of the valve system.
Implementation Method 1
The actuating element is configured to control a respective stem through an interposed first spring
Implementation Method 2
The shutter is maintained in the closed position by a second spring
Implementation Method 3
The oil pumped into the body of the cylinder causes the displacement and distancing of the piston and, consequently, such a cylinder group exerts a force in extension
Data Source
Figure 1~1A
Figure 2~3
Figure 4
AI summary
Valve (1) for controlling the oil flow to a cylinder (10) provided with single hydraulic connection on one side only, the valve comprising a pneumatic drive group (9) configured to axially move a shutter (5) in the valve chamber in at least three different positions including a neutral position, a tilting position and a lowering position; the valve comprising a limiting device (15) that can be activated when the drive unit is in the tilting position; once activated, said limiting device (15) sets the pressurized chamber (C1) of the drive unit and stops the pneumatic supply to the valve shutter.