Electric Disc Brake Reduction Unit with Selective Gear Engagement
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Solution Overview
Problem
Electric disc brakes lack a transmission function in their reduction units, limiting their ability to effectively amplify and transfer rotational forces.
Innovation Solution
Incorporating a reduction unit with a sun gear, planet gear, and internal gears that allow selective engagement based on load state, enabling the amplification and transfer of rotational force from a motor to a spindle member without a fixed reduction gear ratio, using a spindle unit with a nut spindle member and spindle member to facilitate back-and-forth movement of a piston for friction pad pressing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a reduction unit without transmission function is used, then the structure is simple, but the rotational force cannot be effectively amplified or transferred
Solution Approach 1:
The reduction unit is designed to perform multiple functions: it can amplify rotational force when the planet gear engages with the first internal gear, and transfer rotational force without reduction when the planet gear engages with the second internal gear. This multi-functionality resolves the contradiction by allowing the same structure to adapt to different power transmission needs.
Solution Approach 2:
The reduction unit employs a dynamic engagement mechanism where the planet gear can selectively engage with either the first or second internal gear based on operational conditions. This dynamic adaptability allows the system to switch between force amplification and direct force transfer modes, resolving the contradiction between structural simplicity and power transmission effectiveness.
2Device complexity
If a fixed reduction gear ratio is used, then the transmission function is simple, but the braking performance cannot adapt to load conditions
Solution Approach 1:
The transmission function is made dynamic through the selective engagement mechanism of the planet gear with two different internal gears. This allows the reduction gear ratio to change based on load conditions, enabling the braking system to adapt its performance characteristics rather than being constrained to a fixed ratio.
Solution Approach 2:
The system changes the transmission parameter (reduction gear ratio) by switching between two engagement states: one providing force amplification and another providing direct force transfer. This parameter change capability resolves the contradiction by allowing the system to optimize braking performance for different load conditions without increasing overall structural complexity.
3Power
If the planet gear is engaged with the first internal gear, then the rotational force is amplified, but the approach time increases
Solution Approach 1:
The system dynamically switches between two operational modes: one where the planet gear engages with the first internal gear for force amplification, and another where it engages with the second internal gear for faster, direct force transfer. This dynamic switching resolves the contradiction by allowing the system to prioritize speed when force amplification is not immediately required.
Solution Approach 2:
The engagement between the planet gear and the two internal gears operates in periodic cycles, alternating between amplification mode and direct transfer mode based on operational needs. This periodic switching allows the system to achieve both force amplification and rapid response at different times, resolving the time-power trade-off.
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 configuration allows for efficient amplification and transfer of rotational force, reducing approach time and enabling effective braking by adapting to load conditions, enhancing the braking performance of electric disc brakes.
Implementation Method 1
The reduction unit includes a sun gear coupled with a shaft of the motor, a planet gear engaged with the sun gear, a carrier coupled with the planet gear to rotate the spindle member, and an internal gear engaged with the planet gear to amplify a rotational force of the motor or transfer the rotational force of the motor to the spindle member
Implementation Method 2
a spindle unit including a nut spindle member allowing the piston to move back and forth and a spindle member screwed with the nut spindle member
Data Source
AI summary
Disclosed is an electric disc brake including a reduction unit having a transmission function. The electric disc brake includes a piston in the caliper housing such that the piston is movable back and forth to press one frictional pad, a spindle unit including a nut spindle member allowing the piston to move back and forth and a spindle member screwed with the nut spindle member, and a reduction unit coaxially coupled with the spindle unit, and a motor rotating the reduction unit forward and backward. The reduction unit includes a sun gear coupled with a shaft of the motor, a planet gear, a carrier coupled with the planet gear to rotate the spindle member, and first and second internal gears engaged with the planet gear to amplify a rotational force of the motor or transfer the rotational force of the motor to the spindle member without a reduction gear ratio.