Disc Brake Interface Plate for Single-Motor Parking Brake Actuation
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Solution Overview
Problem
Incorporating an electromechanical parking brake function into two-piston disc brakes increases the size and complexity, as well as the mass of the brake system, due to the need for two motors, which is undesirable for large and high-power vehicles.
Innovation Solution
A disc brake design featuring two hydraulically actuatable pistons with an interface device and a push member actuated by a gear motor, where the interface device ensures balanced force distribution on the brake pad, allowing for both hydraulic and electromechanical actuation without the need for two separate motors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two motors are used to actuate each piston in a two-piston disc brake for electromechanical parking brake function, then the parking brake function is achieved, but the overall size and mass of the brake system increases
Solution Approach 1:
The patent merges the functions of two separate motors into a single motor by using a common push member actuated by one motor to simultaneously control both brake pads. The single motor actuates the push member, which in turn actuates both brake pads through the interface device, achieving parking brake function without requiring two separate motors, thus reducing overall mass and size.
Solution Approach 2:
The single motor and push member assembly serves multiple functions: it can actuate both brake pads for parking brake application, release both pads, and work in conjunction with hydraulic pistons for service braking. The interface device with through-openings allows the hydraulic pistons to pass through while the push member acts on the brake pad support, enabling one motor to control both sides of the brake system.
2Reliability
If two motors are used to actuate each piston in a two-piston disc brake for electromechanical parking brake function, then the parking brake function is achieved, but the device complexity increases
Solution Approach 1:
The patent merges the functions of two separate motors into a single motor by using a common push member actuated by one motor to simultaneously control both brake pads. The single motor actuates the push member, which in turn actuates both brake pads through the interface device, achieving parking brake function without requiring two separate motors, thus reducing overall mass and size.
Solution Approach 2:
The single motor and push member assembly serves multiple functions: it can actuate both brake pads for parking brake application, release both pads, and work in conjunction with hydraulic pistons for service braking. The interface device with through-openings allows the hydraulic pistons to pass through while the push member acts on the brake pad support, enabling one motor to control both sides of the brake system.
3Weight of stationary object
If a single push member actuated by a gear motor is used between two hydraulically actuatable pistons, then the size and mass are reduced, but the force distribution on the brake pad must be balanced
Solution Approach 1:
The interface device acts as an intermediary between the single push member and the brake pad support. It includes a plate with two through-openings that allow hydraulic pistons to pass through, while the push member acts on the brake pad support through the central area of the plate. This intermediary structure ensures that the single push member can apply force centrally while the hydraulic pistons maintain their positions, achieving balanced force distribution.
Solution Approach 2:
The interface plate has different functional areas: the central area where the push member acts to apply parking brake force, and the through-openings that allow hydraulic pistons to pass through and apply service braking force. This local differentiation of function within the interface device allows the single push member to achieve balanced force distribution while maintaining compatibility with the dual-piston hydraulic system.
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 design achieves balanced and homogeneous force distribution on the brake pad, simplifies implementation, and allows for the use of existing electromechanical actuators from single-piston disc brakes, reducing the overall size and mass of the brake system while maintaining effective braking performance.
Implementation Method 1
an actuator configured to move the push member axially
Implementation Method 2
at least a first piston and a second piston mounted in a sliding manner in the calliper and hydraulically actuatable
Implementation Method 3
a first brake pad mounted in a sliding manner in the carrier, said first brake pad comprising a pad support and a friction material
Data Source
AI summary
Disc brake comprising a carrier, at least a first brake pad mounted in a sliding manner in the carrier, the first brake pad comprising a pad support and a friction material, and a caliper comprising two hydraulically actuatable pistons. The disc brake comprises a third piston which can be actuated at least by an actuator configured to move the third piston axially, the third piston being arranged between the two pistons, and an interface device arranged between the third piston and the pad support, the interface device comprising a plate comprising two through-openings, each aligned with a hydraulically actuatable piston and traversed by the pistons, and the head of the other piston is intended to come into contact with the plate between the two openings