Stroke Controlled Balancing Device for Hydraulic Braking Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional stroke-controlled balancing devices for hydraulic braking systems in agricultural vehicles have an excessive axial size, while pressure-controlled devices face operational challenges due to varying pressure conditions, and neither type effectively balances braking pressures under all conditions, particularly in boosted systems with pre-filling functions.
Innovation Solution
A stroke-controlled balancing device with a normally closed balancing valve that slides along a stem connected to a controlling rod, providing both brake boosting and pre-filling functions, allowing mechanical balancing of pressures through a telescopic movement and reducing axial size by integrating the balancing mechanism within the pressurizing chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stroke-controlled balancing devices are used to ensure reliable pressure balancing, then the axial size of the braking system becomes excessive
Solution Approach 1:
The balancing valve is nested within the pressurizing chamber, specifically positioned inside the cavity formed by the bar and bushing. This nesting arrangement allows the balancing mechanism to occupy space within the existing chamber volume rather than adding external axial length, thereby reducing the overall axial size while maintaining the pressure balancing function
Solution Approach 2:
The balancing device transitions from an axial arrangement to a radial arrangement by positioning the balancing valve within the pressurizing chamber's cross-sectional area. The balancing duct connects radially through the chamber wall, and the valve operates within the chamber's internal volume, effectively utilizing the radial dimension to achieve pressure balancing without increasing axial length
2Length of moving object
If pressure-controlled balancing devices are used to reduce axial size, then operational reliability deteriorates under varying pressure conditions
Solution Approach 1:
The balancing valve is designed to dynamically respond to piston stroke position rather than relying on fixed pressure thresholds. As the piston moves during braking operation, the valve automatically adjusts its position within the pressurizing chamber to maintain pressure balance, adapting to varying braking conditions and pressure requirements in real-time
Solution Approach 2:
The balancing mechanism incorporates inherent feedback through the mechanical connection between the piston stroke and the balancing valve position. The valve's location within the pressurizing chamber allows it to sense pressure conditions and automatically adjust fluid flow between chambers, creating a self-regulating system that maintains reliability under varying operational conditions
3Ease of operation
If sealing gaskets are made to slide within master cylinders for balancing duct communication, then the length of pistons and master cylinders must be increased
Solution Approach 1:
The balancing duct communication function is extracted from the traditional sliding gasket mechanism and repositioned within the pressurizing chamber. The balancing valve, located inside the chamber, provides the communication pathway between the balancing duct and the chamber interior, eliminating the need for extended piston and cylinder lengths required by sliding gasket arrangements
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 axial size of the braking system by approximately 35 mm compared to conventional stroke-controlled devices and matches the size of pressure-controlled systems, while ensuring balanced braking and pre-filling functionality, thus addressing the operational issues of both types.
Implementation Method 1
the mechanism for balancing pressure is actuated mechanically when the pistons working in the master cylinder move over a predetermined initial stroke
Implementation Method 2
the sealing gasket is arranged to seal, by sliding along an outer surface of a stem, the orifices in the master cylinder
Data Source
AI summary
A stroke-controlled balancing device for hydraulic braking systems, comprising a balancing duct, a normally closed balancing valve, configured, in use, to maintain a connection between the hydraulic braking system and the balancing duct either closed or open, a stem having an external surface and an internal surface. A balancing channel is provided on the internal surface of the stem, said channel being hydraulically connected to the balancing duct, and the balancing valve is configured to slide, in use, along the external surface of the stem in order to open the connection between the braking system and the balancing duct. A braking system comprising the balancing device, as well as a method of operation of the braking system, are also described.