Temperature-Compensating Braking Device Using Bimetallic Valve Plate
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Solution Overview
Problem
Braking devices in motor vehicles experience undesirable variations in braking properties due to temperature-dependent viscosity of viscous liquids, limiting their effectiveness over a wide temperature range.
Innovation Solution
A braking device with a temperature-dependent valve plate that changes shape due to bimetallic or layered material effects, adjusting flow resistance to maintain consistent braking performance across varying temperatures by altering the flow channel geometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a viscous fluid is used for braking, then braking effect is achieved, but braking performance becomes highly temperature-dependent
Solution Approach 1:
The patent changes the geometric parameters of the flow channel (cross-sectional area, shape) to compensate for viscosity changes. The flow channel geometry is designed such that its effective cross-section varies with temperature, counteracting the temperature-dependent viscosity changes of the braking fluid to maintain consistent braking torque across a wide temperature range.
Solution Approach 2:
The patent utilizes thermal expansion of the flow channel structure itself. The flow channel is designed with materials or geometries that expand or contract with temperature changes, automatically adjusting the flow resistance to compensate for fluid viscosity changes without requiring external control systems.
2Reliability
If valve flaps are arranged inside the piston to control flow, then temperature-dependent damping is achieved, but mechanical complexity increases
Solution Approach 1:
The patent extracts the temperature compensation function from the piston interior and relocates it to the flow channel structure. Instead of placing valve flaps inside the piston, the compensation mechanism is integrated into the flow channel geometry itself, simplifying the piston structure while achieving the same temperature-dependent flow control.
Solution Approach 2:
The patent merges the flow channel structure with the temperature compensation function. The flow channel is designed to inherently provide temperature compensation through its geometry and material properties, combining what were previously separate functions (flow control and temperature compensation) into a single integrated structure.
3Reliability
If an annular element with temperature-dependent shape is used, then flow control is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent uses parameter changes in the flow channel geometry (cross-sectional area, shape dimensions) that are achieved through standard manufacturing processes. Instead of requiring complex temperature-dependent shape-changing annular elements, the design uses fixed geometric parameters that provide the desired temperature compensation through their configuration.
Solution Approach 2:
The patent applies local quality variations in the flow channel structure, where specific sections of the flow channel have different geometric properties tailored for temperature compensation. This allows complex functionality to be achieved through localized geometric features rather than requiring the entire annular element to have complex temperature-dependent properties.
4Reliability
If disc springs and valve plates are used for temperature control, then damping adjustment is achieved, but device complexity increases
Solution Approach 1:
The patent extracts the temperature control function from the valve assembly and integrates it directly into the flow channel structure. This eliminates the need for separate disc springs and valve plates, as the flow channel geometry itself provides the temperature-dependent flow control.
Solution Approach 2:
The patent merges the valve control function with the flow channel structure. The flow channel is designed to inherently provide temperature-dependent flow resistance without requiring separate valve components, combining what were previously distinct functions into a unified structure.
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 ensures almost constant braking properties over a wide temperature range, from -30°C to +70°C, without the need for complex external control systems, by compensating for viscosity changes in the viscous liquid.
Implementation Method 1
A braking device with a temperature-dependent valve plate that changes shape due to bimetallic or layered material effects
Implementation Method 2
the viscous fluid brakes the movement of the movable element in at least one flow section
Data Source
Figure 1a~1c
Figure 2a~2c
Figure 3a~3c
AI summary
The invention relates to a braking device for an interior assembly of a motor vehicle for braking a movable part of the assembly, comprising a housing filled with a viscous fluid and an element movable therein, wherein the viscous fluid brakes the movement of the movable element in at least one flow section. The braking device is characterized in that the geometry of the at least one flow section changes with the ambient temperature. The invention further relates to an interior assembly of a motor vehicle with at least one braking device for braking the movement of a movable part of the assembly.