Shuttle Valve Parking Brake Axle Grouping
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Solution Overview
Problem
The existing parking brake devices for commercial vehicles require a large number of shuttle valves, leading to increased assembly effort and risk of damage from stone chips, due to their wheel-by-wheel installation and complex piping, which complicates the ventilation of spring brake cylinders and can result in system failure from leaks.
Innovation Solution
A compact design where two parking brakes are supplied by a single shuttle valve, reducing the number of valves and eliminating the need for additional piping, with the option to integrate the shuttle valve into an ECPB module or mount it on the vehicle's frame, minimizing the risk of stone damage and simplifying assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a shuttle valve is mounted on each wheel for wheel-by-wheel control of parking brakes, then precise individual control of each parking brake is achieved, but the number of shuttle valves increases and assembly complexity increases
Solution Approach 1:
The patent segments the brake system by axle rather than by wheel, grouping parking brakes on the same axle together. Each axle receives dedicated pressure medium supply lines with associated shuttle valves, allowing independent control of each axle's parking brakes while reducing the total number of shuttle valves compared to individual wheel-by-wheel control.
Solution Approach 2:
The pressure medium supply lines and shuttle valves are designed to serve multiple parking brakes simultaneously. A single shuttle valve assembly can control parking brakes on both left and right wheels of the same axle, making the system more universal and reducing component quantity while maintaining operational control.
2Ease of operation
If shuttle valves are mounted wheel-by-wheel on spring brake cylinders, then direct control at each wheel is achieved, but assembly difficulty increases due to small installation space
Solution Approach 1:
The patent relocates the shuttle valves from the wheel level (horizontal dimension near the brake cylinder) to the axle level (higher dimension on the vehicle frame). This dimensional change provides ample installation space and simplifies assembly while maintaining the ability to control individual axle parking brakes.
3Ease of operation
If shuttle valves are mounted on each wheel, then individual brake control is achieved, but the risk of stone chip damage increases
Solution Approach 1:
The patent extracts the shuttle valves from their vulnerable position near the wheels and relocates them to the protected area on the vehicle frame. This separation removes the sensitive components from the direct path of flying stones and debris while preserving the control functionality through the pressure medium supply lines.
4Reliability
If multiple pressure medium supply lines are branched for each parking brake, then complete ventilation capability is achieved, but piping complexity increases
Solution Approach 1:
The patent merges the pressure medium supply lines for parking brakes on the same axle into a shared system. Instead of separate lines for each wheel, the supply lines are combined at the axle level with common shuttle valves and manifold structures, reducing piping complexity while maintaining the ability to ventilate each parking brake independently through the shared pressure medium supply.
Data Source
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AI summary
The invention relates to a parking brake device (10) for a pneumatic brake system of a utility vehicle. Said device comprises at least one first pressure medium supply line (50) via which a pressure medium can be supplied to a parking brake (20, 22) via a first connection (174) of a shuttle valve (168), and a second pressure medium supply line (32) via which the pressure medium can be supplied to the at least one parking brake (20, 22) via a second connection (176) of the shuttle valve (168). The invention is characterized in that the pressure medium can be supplied to at least two parking brakes (20, 22) via the shuttle valve (168).