Rail Vehicle Brake Unit Clearance Adjustment Mechanism
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Solution Overview
Problem
Existing brake units for rail vehicles face complexity in adjusting clearance, leading to weight and cost inefficiencies, as well as challenges in maintaining proper brake pad alignment and wear compensation, which can result in uneven braking and increased maintenance needs.
Innovation Solution
The brake unit incorporates a blocking element connected to the brake piston via a pretensioning spring, with a blocking member that engages in a toothing or frictional connection, allowing for adjustable clearance and easy manual opening for maintenance, while reducing the risk of component jamming and wear by locating mechanical components within the hydraulic area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a ball valve with spacer pin is used to extend brake piston travel, then brake piston clearance adjustment is enabled, but device complexity increases
Solution Approach 1:
The invention extracts the clearance adjustment function from the ball valve mechanism and implements it through a separate blocking element with stops. The blocking element is specifically designed to limit brake piston travel and define clearance, while the ball valve retains its original function of controlling hydraulic fluid flow. This separation of functions reduces overall system complexity.
Solution Approach 2:
The clearance adjustment mechanism is segmented into distinct components: a blocking element with first and second stops, and a locking member with associated stops. This segmentation allows independent adjustment and maintenance of clearance parameters without affecting the ball valve operation.
2Ease of operation
If mechanical clearance adjustment components are placed outside hydraulic area, then accessibility for maintenance is improved, but risk of component jamming and wear increases
Solution Approach 1:
The blocking element serves as an intermediary component positioned within the hydraulic area that mediates between the brake piston and external adjustment mechanisms. By placing the critical clearance-defining stops within the hydraulic environment, the design ensures they are protected from contamination while remaining accessible through the hydraulic system's natural access points.
3Manufacturing precision
If blocking element with multiple stops is added to brake piston, then clearance adjustment precision is improved, but device complexity increases
Solution Approach 1:
The blocking element merges multiple functions into a single component: it provides both the first stop for initial clearance definition and the second stop for extended travel limitation. The locking member integrates with this blocking element through its associated stops, creating a unified adjustment system that achieves precise clearance control without requiring multiple separate adjustment mechanisms.
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 simplifies the adjustment of clearance, reduces weight and cost, ensures even brake pad wear, and enhances maintenance accessibility, thereby improving braking performance and reliability while minimizing component wear and jamming risks.
Implementation Method 1
a blocking member being in engagement with the blocking element under the force of a pretensioning spring
Implementation Method 2
The connection between the blocking element and the blocking member can also be designed as a frictional connection instead of the toothed engagement.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a brake unit (9; 109; 209) for a vehicle, in particular a rail vehicle (1), having a brake cylinder (143; 243), a brake piston (144; 244) guided axially in the brake cylinder and means (159; 259) for adjusting a clearance, which form two first stops (144.1, 163.1; 270.1, 262.3), which are assigned to each other and strike against each other when the brake unit is opened, and which form two second stops (144.2, 163.2; 270.2, 262.4), which are assigned to each other and strike against each other when the brake unit is closed, wherein one of the first stops (163.1; 262.3) is formed on a blocking element (163; 262) that is functionally connected to the brake piston. In order to make the adjustment of the clearance simpler in design, one of the second stops (163.2; 262.4) is formed on the blocking element (163; 262) that is functionally connected to the brake piston, wherein a blocking member (165; 261) is in engagement with the blocking element under the force of a pre-stressing spring (164; 273) in such a manner that the blocking element is blocked by the blocking member when the first stops (144.1, 163.1; 270.1, 262.3) strike and can continue to latch or continue to slide in relation to the blocking member under the force of the brake piston (144; 244) when the second stops (144.2, 163.2; 270.2, 262.4) strike. The invention further relates to a vehicle (1) having such a brake unit (9; 109; 209).