Vehicle Electric Braking Device Cap Member Sealing
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Solution Overview
Problem
Existing vehicle electric braking devices face challenges in maintaining a satisfactory lubrication state over a long period due to gas entering between abutment parts of the screw member, leading to lubricant exhaustion and reduced efficiency.
Innovation Solution
A vehicle electric braking device configuration that includes a cap member and storage chamber partitioned by cylindrical parts to seal in lubricant, preventing gas inflow and accommodating volume changes through sliding contact and rotational movements, ensuring hermetic sealing and lubricant renewal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a screw member is used to convert rotational motion to translational motion in an electric braking device, then the braking force can be effectively generated, but gas enters between the abutment parts of the screw member causing lubricant exhaustion and reduced efficiency over time
Solution Approach 1:
The pressing member is segmented into a piston body and a cap member that can move relative to each other. This segmentation creates a sealed chamber between them, isolating the screw member from external gas while allowing the cap to accommodate volume changes during braking operations
Solution Approach 2:
The cap member acts as an intermediary between the external environment and the screw member. It seals the chamber containing the screw member while accommodating volume changes, preventing direct gas contact with the lubricated surfaces of the screw member
2Productivity
If the screw member operates continuously during braking, then the braking function is maintained, but the lubricant is exhausted due to gas entry and repeated operations
Solution Approach 1:
The cap member is extracted as a separate movable component from the piston body. This allows the sealing function to be separated from the structural function, enabling the seal to move independently to accommodate volume changes without compromising the structural integrity of the piston
Solution Approach 2:
The cap member is designed to move dynamically relative to the piston body in response to volume changes during braking operations. This dynamic adjustment maintains hermetic sealing while accommodating the expanding and contracting of the lubricant and gas mixture during operation
3Reliability
If a seal device is added to prevent gas entry into the screw member, then lubrication can be maintained, but the device complexity increases
Solution Approach 1:
The cap member performs multiple functions: it seals the chamber containing the screw member, accommodates volume changes during braking, and prevents gas entry while allowing lubricant renewal. This multi-functionality eliminates the need for separate sealing mechanisms, reducing overall device complexity
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 effectively maintains a long-term satisfactory lubrication state by preventing gas entry and renewing lubricant supply, enhancing the operational efficiency and longevity of the braking system.
Implementation Method 1
a cap member brought into slide contact with the first cylindrical part on an outer periphery of the cap member
Implementation Method 2
filled with a lubricant for lubricating the screw member
Data Source
AI summary
Rotational motion of a shaft member rotationally driven by a motor is converted by a screw member into translational motion of a pressing member. An outer periphery of a cap member is brought into slide contact with a first cylindrical part of the pressing member so that the cap member is relatively movable in an axial direction of the pressing member and is relatively unrotatable about its axis. An inner periphery of the cap member is brought into slide contact with a second cylindrical part of the shaft member so that the cap member is relatively movable in an axial direction of the shaft member and is relatively rotatable about its axis. The first cylindrical part, the second cylindrical part, and the cap member partition a storage chamber connected to one end of the screw member, and a lubricant for lubricating the screw member is filled inside the storage chamber.