Electric Booster Nut Screw Buffer for Positioning Accuracy
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Solution Overview
Problem
In automotive braking systems, the electric booster's nut screw deviates from its original position due to excessive rotation caused by abrasion, leading to potential damage and noise generation when returned, necessitating a solution to prevent collisions and maintain accurate positioning.
Innovation Solution
An electric booster design incorporating a buffer made of a different material than the booster body, with a rotation restriction part and stopper, prevents excessive nut screw movement and collision, ensuring accurate return to a preset position and reducing noise and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the nut screw is allowed to move freely along the bolt screw, then the braking force can be generated and released, but the nut screw may deviate from the original position due to excessive rotation caused by abrasion, leading to collision and noise generation
Solution Approach 1:
The buffer is pre-installed in the booster body at the position where the nut screw will return after braking force release. This preliminary placement ensures that when the nut screw returns, the buffer is already in position to absorb any potential collision, preventing noise and damage before they can occur.
Solution Approach 2:
The buffer made of plastic material is positioned between the nut screw and the booster body to provide cushioning before collision can occur. This beforehand cushioning absorbs the impact energy when the nut screw returns to its original position, preventing direct metal-to-metal collision and the associated noise and damage.
2Productivity
If the nut screw is allowed to move freely along the bolt screw, then the braking mechanism can operate, but excessive rotation due to abrasion causes the nut screw to deviate from the original position, leading to damage between parts
Solution Approach 1:
The buffer is pre-positioned to provide cushioning before the nut screw can collide with the booster body. This beforehand cushioning protects the components from damage while allowing the braking mechanism to operate freely during normal operation.
Solution Approach 2:
The buffer acts as an intermediary element between the nut screw and the booster body. It mediates the interaction by absorbing impact forces, preventing direct contact and potential damage between the metal components while allowing the braking mechanism to function.
3Reliability
If a buffer is added to prevent collision and noise, then the positioning accuracy and component protection are improved, but the device complexity increases
Solution Approach 1:
Instead of redesigning the entire electric booster system, the buffer is added only at the specific location where the nut screw returns after braking force release. This localized addition provides the necessary protection and positioning accuracy without significantly increasing the overall device complexity.
Solution Approach 2:
The buffer is made of plastic material, which is simpler and cheaper than metal components. This allows the addition of the buffer to improve reliability without significantly increasing device complexity or cost, as the buffer is a simple, inexpensive element compared to the motor, bolt screw, and nut screw.
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 buffer effectively restricts nut screw movement, preventing damage and noise, extending the electric booster's lifespan and providing a comfortable ride by ensuring precise positioning and reducing wear between components.
Implementation Method 1
a buffer mounted in the booster body and made of a material different from the booster body
Data Source
AI summary
An electric booster including: a motor; a booster body coupled to the motor; a bolt screw rotatably installed in the booster body, connected to the motor, and rotated by the motor; a buffer mounted in the booster body and made of a material different from the booster body; and a nut screw restricted from rotating by the buffer, and screwed to the bolt screw so as to be linearly moved in the longitudinal direction of the bolt screw.