EMB Parking Mechanism With Wedge Locking for Stepless Brake Force
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Solution Overview
Problem
Current electronic mechanical brake (EMB) systems face limitations in providing stepless variable parking force and may cause vehicles to slide when the parking force increases, as they lack the ability for continuous adjustment and often result in heating issues due to long-term motor usage.
Innovation Solution
A parking mechanism integrated into the EMB system, comprising a wheel disc, a wedge disc, and a drive assembly, which utilizes a wedge groove and elastic parts to adjust friction levels steplessly and implement unidirectional locking, allowing for continuous adjustment of parking force and preventing sliding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the motor of the EMB system is powered on for long-time braking, then braking force is maintained, but serious heating problem occurs
Solution Approach 1:
The system dynamically switches between two braking modes: using the motor-driven EMB for short-time braking and the mechanically locked EPB for long-time braking. This dynamic mode switching allows the system to maintain braking duration while avoiding continuous motor operation that causes heating.
Solution Approach 2:
The EPB unit provides self-locking capability through its ratchet and pawl mechanism, allowing the braking force to be maintained without continuous power supply to the motor. The mechanical locking structure holds the braking position passively, eliminating the need for continuous motor engagement.
2Force
If the parking force is increased in conventional EMB systems, then parking capability is improved, but the vehicle may slide due to stepwise force adjustment
Solution Approach 1:
The EPB mechanism provides continuous, dynamic adjustment of parking force through the rotation angle of the drive shaft, which controls the engagement depth of the pawl with the ratchet teeth. This allows smooth variation of braking force from zero to maximum, preventing vehicle sliding during force adjustment.
Solution Approach 2:
The system changes the engagement parameter of the ratchet-pawl mechanism by rotating the drive shaft, which alters the effective leverage and contact force between the pawl and ratchet teeth. This parameter change enables continuous adjustment of parking force to match the required holding force for different vehicle conditions.
3Ease of manufacture
If an EPB unit is integrated into the EMB system, then cost is reduced and long-time braking is improved, but the device complexity increases
Solution Approach 1:
The EPB unit is integrated into the existing EMB system by sharing common components such as the motor shaft, friction elements, and mounting structure. The EPB mechanism is combined with the EMB assembly, allowing both systems to coexist in a compact configuration that reduces overall complexity compared to separate installations.
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 mechanism enables stepless adjustment of parking force, ensuring the vehicle remains stationary without sliding, and allows for self-locking when the electromagnetic drive is powered off, reducing heating issues and maintaining braking without continuous motor engagement.
Implementation Method 1
An elastic part is disposed between the movable part and the first end of the wedge groove, and the elastic part is in a compressed energy storage state, so that the elastic part has a trend of driving the movable part to move from the first end to the second end of the wedge groove
Implementation Method 2
A wedge groove with an opening facing the wheel disc is formed on a surface of the wedge disc facing the wheel disc
Implementation Method 3
When the movable part moves between the first end and the second end of the wedge groove, friction between the movable part and the wheel disc changes
Data Source
Figure 1
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AI summary
This application provides a parking mechanism, an electronic mechanical brake (EMB) system, and a vehicle. The parking mechanism may be integrated into an EMB system of the vehicle to brake the vehicle to standstill. The parking mechanism includes a wheel disc (1), a wedge disc (2), and a drive assembly (3). An axis of the wheel disc and an axis of the wedge disc both are aligned with an axis of a motor shaft. A wedge groove (21) with an opening facing the wheel disc is formed on a surface of the wedge disc facing the wheel disc, and a movable part (22) in contact with the wheel disc is disposed in the wedge groove. In a direction from a bottom of the wedge groove to the wheel disc, a groove depth at a first end of the wedge groove is greater than a size of the movable part, and a groove depth at a second end of the wedge groove is less than the size of the movable part. An elastic part (23) is disposed between the movable part and the first end of the wedge groove, and the elastic part has a trend of driving the movable part to move from the first end to the second end of the wedge groove. The drive assembly is configured to drive the movable part to move from the second end to the first end of the wedge groove. The parking mechanism can provide stepless variable parking force. This can implement unidirectional locking of the motor shaft when the parking force increases.