Brake System Clutch Mechanism for Axial Nut Positioning
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Solution Overview
Problem
In brake systems, the gap between the nut and the bottom pocket wall increases over time due to brake pad wear, leading to increased response time during electromechanical applications, as the nut does not move axially with the brake piston during hydraulic applications.
Innovation Solution
The brake system includes a clutch that allows the nut to move axially with the brake piston during hydraulic applications, maintaining a consistent gap between the nut and the bottom pocket wall, thereby reducing lag time when switching to electromechanical applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the brake system uses a fixed nut position relative to the brake piston, then the structure is simple, but the gap between the nut and bottom pocket wall increases over time due to brake pad wear, leading to increased response time during electromechanical applications
Solution Approach 1:
The patent applies the dynamics principle by making the nut's axial position dynamic rather than fixed. The nut is configured to move axially relative to the brake piston through threaded engagement with the spindle, allowing its position to be adjusted automatically as brake pads wear. This dynamic positioning maintains a substantially constant gap between the nut and bottom pocket wall, ensuring consistent response time for electromechanical brake applications without requiring complex additional components.
Solution Approach 2:
The patent applies parameter changes by modifying the axial position parameter of the nut. As brake pads wear and the brake piston moves axially, the nut's axial position is automatically adjusted to maintain a constant gap distance. This parameter adjustment is achieved through the threaded spindle mechanism, which converts rotational movement into precise axial positioning, thereby maintaining optimal response time characteristics throughout the brake pad service life.
2Productivity
If the nut does not move axially with the brake piston during hydraulic applications, then the hydraulic braking function is simple, but the gap increases over time causing lag time when switching to electromechanical applications
Solution Approach 1:
The patent applies continuity of useful action by ensuring the nut moves continuously with the brake piston during hydraulic braking operations. As the brake piston moves axially during normal hydraulic braking, the nut is carried along and maintains its threaded engagement with the spindle. This continuous movement ensures that when electromechanical braking is activated, the nut is already in the correct axial position, eliminating lag time and maintaining consistent braking efficiency across both braking modes throughout the service life of the brake pads.
3Loss of time
If the gap between the nut and bottom pocket wall is maintained small, then the response time is reduced, but the brake piston axial position changes over time due to wear requiring the nut to move with it
Solution Approach 1:
The patent applies dynamics by making the nut's axial position adaptable rather than fixed. The threaded engagement between the nut and spindle allows the nut to move dynamically with the brake piston as wear occurs. This dynamic adaptability ensures the gap remains small and consistent throughout the service life of the brake pads, maintaining optimal response time without requiring manual adjustment or complex additional mechanisms.
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 solution ensures consistent response time and reduced lag between initiating the electromechanical application and creating the clamping force, even as brake pads wear over time, by maintaining a stable gap and axial position of the nut relative to the brake piston.
Implementation Method 1
The clutch may comprise a friction disc and a friction plate. The friction disc may be connected to the nut, and the friction plate may be connected to the piston pocket. When the brake piston is moved by the pressurized fluid, friction between the friction disc and friction plate causes the nut to rotate, thereby moving the nut axially with the brake piston.
Implementation Method 2
During the hydraulic application, a fluid may be pressurized, which may cause the brake piston to move into contact with the brake pad, and then move the brake pad into contact with the moving component to create the clamping force.
Implementation Method 3
A typical rotary to linear stage mechanism comprises a spindle and a nut. The spindle is in rotational communication with the motor, and the nut is threadably connected to the spindle. Rotation of the spindle causes the nut to move axially along a length of the spindle.
Data Source
AI summary
A brake system that includes a brake piston, a rotary to linear stage mechanism, and a clutch. The brake piston extends along a longitudinal axis. The brake piston includes a piston pocket. The rotary to linear stage mechanism includes a spindle and a nut. The nut is received in the piston pocket. The brake system is operable in a first braking application and in a second braking application. During the first braking application, the clutch is adapted to provide for the nut to rotate about the longitudinal axis. During the second braking application, the clutch is adapted to restrict or prevent the nut from rotating about the longitudinal axis.