Spring Brake Cylinder Emergency Release Mechanism
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Solution Overview
Problem
Existing spring brake cylinders with mechanical emergency release devices suffer from material abrasion and increased installation space due to sliding movements between hexagonal profiles, which can damage the compressed air system and occupy excessive space.
Innovation Solution
A positively locking connection is formed between polygonal profiles on the nut and intermediate bush, and the spring brake piston tube, allowing for reduced wear and a more space-efficient design using materials like polyamide or metal for the bush, while selecting other components based on stiffness or weight requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a positively locking connection is formed between polygonal profiles on the nut and intermediate bush, and the spring brake piston tube, then material wear is reduced and space usage is minimized, but the device complexity increases due to the additional intermediate bush component
Solution Approach 1:
An intermediate bush is introduced between the nut and the spring brake piston tube to eliminate direct sliding contact between hexagonal profiles. The intermediate bush has polygonal profiles that positively lock with both the nut and the piston tube, preventing relative sliding movements and material abrasion while reducing the required engagement length and installation space.
2Ease of operation
If hexagonal profiles are used for the positively locking connection, then the emergency release device can be actuated, but material abrasion occurs between sliding surfaces which can damage the compressed air system
Solution Approach 1:
The intermediate bush acts as a mediator that prevents direct sliding contact between the nut and the spring brake piston tube. By introducing this intermediate element with complementary polygonal profiles, the mechanism maintains its emergency release functionality while eliminating the harmful sliding friction and material wear that would otherwise occur between the hexagonal profiles.
3Ease of operation
If sliding movements occur between hexagonal profiles in the emergency release device, then the mechanism can function, but increased installation space is required to accommodate the sliding clearance
Solution Approach 1:
The intermediate bush with polygonal profiles enables the emergency release mechanism to function without requiring sliding clearance. The positively locking polygonal connections eliminate the need for sliding movements, allowing for a more compact design with reduced installation space while maintaining full operational capability.
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 material wear and minimizes space usage, enhancing the reliability and efficiency of the emergency release mechanism while maintaining the mechanical integrity of the brake system.
Implementation Method 1
a threaded spindle (50) which can be rotated with respect to the spring brake cylinder (4) and can be screwed into a nut (56)
Implementation Method 2
A spring device which prestresses the spring brake piston in the direction of the pressure space is arranged in the spring accumulator chamber
Data Source
AI summary
A pneumatic spring brake cylinder is provided for brake systems of vehicles, including a housing in which a spring brake piston loaded by an accumulator spring and connected to a spring brake piston tube is guided in a movable manner, and an emergency release device for the emergency release of the spring brake piston in the event of a drop in pressure. The emergency release device contains a spindle which can be rotated relative to the spring brake cylinder and which can be screwed in a nut that is held in a rotationally fixed manner in the spring brake piston tube by a form-fitting connection. The nut interacts with an axial stop on the spring brake piston in order to trigger a release movement against the effect of the accumulator spring. The formfitting connection is formed between an outer polygonal profiled section of the outer circumference of the nut in a circumferential direction and a complementary circumferential inner polygonal profiled section on the inner circumference of an intermediate bushing and between an outer polygonal profiled section of the outer circumference of the intermediate bushing in the circumferential direction and a complementary circumferential inner polygonal profiled section on the inner circumference of the spring brake piston tube.