Electric Booster Screw Rotation Limiting Mechanism
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Solution Overview
Problem
In electric boosters, excessive screw rotation during brake release can cause part damage due to imprecise control, leading to nut movement beyond its original state.
Innovation Solution
The electric booster design includes a motor part, body part, screw part, nut part, first and second piston parts, and elastic parts, with a nut damper and guide system to restrict excessive nut movement and absorb shock, preventing part damage by ensuring precise control during brake release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the screw is rotated to release the braking force, then the nut is returned to the original state, but the screw may be additionally rotated causing excessive nut movement and part damage
Solution Approach 1:
The first piston protrusion part is pre-positioned to contact the screw shaft part at a predetermined location. When the screw rotates during brake release, this pre-positioned contact point limits the screw's rotation range, preventing excessive nut movement before damage can occur. The limiting structure is prepared in advance to stop the harmful motion.
Solution Approach 2:
The first piston protrusion part acts as an intermediary element between the screw shaft part and the nut part. It mediates the motion transmission by providing a contact point that allows controlled movement while blocking excessive rotation, thus protecting the nut from damage caused by uncontrolled screw rotation.
2Stability of the object's composition
If a ring is assembled to the screw to prevent part separation, then the screw-nut connection is secured, but the structure complexity increases
Solution Approach 1:
The first piston protrusion part is integrated into the first piston part structure, combining the piston function with the screw rotation limiting function. This eliminates the need for a separate ring component, as the limiting feature is merged into the existing piston structure, reducing overall device complexity while maintaining connection stability.
Solution Approach 2:
The first piston part serves multiple functions: it supports the screw shaft part, transmits force from the nut, and limits screw rotation through its protrusion part. This multi-functionality replaces the need for separate components like the ring, simplifying the overall structure while maintaining the stability of the screw-nut connection.
3Manufacturing precision
If precise control is performed during brake release, then excessive screw rotation is prevented, but the control system complexity increases
Solution Approach 1:
Instead of using a complex control system to precisely limit screw rotation during brake release, the patent employs a simple mechanical limiting structure where the first piston protrusion part physically contacts the screw shaft part. This mechanical constraint provides precise control automatically without requiring complex electronic or hydraulic control systems.
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 prevents part damage by restricting additional nut movement and absorbing shock, ensuring the electric booster operates safely and efficiently even with excessive motor operation during braking release.
Implementation Method 1
a first elastic part supporting the first piston part
Implementation Method 2
a second elastic part supporting the second piston part
Implementation Method 3
a screw rotated by the motor, a nut linearly moved by the screw
Data Source
AI summary
An electric booster may include: a motor part configured to be driven by power applied thereto; a body part mounted and fixed onto the motor part; a cylinder part coupled to the body part; a screw part connected to the motor part and rotated; a nut part embedded in the body part, and screwed to the screw part so as to linearly move; a first piston part constraining an end of the screw part, and moved to the cylinder part while being pressed by the nut part; a first elastic part supporting the first piston part; a second piston part supported by the first elastic part; and a second elastic part supporting the second piston part.