Vehicle Brake Actuator Layout for Isolating Hydraulic Axial Load
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Solution Overview
Problem
Existing brake devices for vehicles transmit axial loads caused by hydraulic pressure to the motor, leading to increased size, weight, and complexity due to the need for robust motor housings and bearings, and complicating power transmission structures.
Innovation Solution
A brake device design that includes a housing unit, cylinder unit, motor unit, screw shaft, nut unit, piston unit, and bearing unit, where the bearing unit supports axial loads without transmitting them to the motor, using a guide unit to constrain nut unit rotation and a sleeve unit to guide piston movement, reducing the need for additional alignment components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the motor supports the axial load caused by hydraulic reaction force, then sufficient rigidity is ensured, but the size and weight of motor housing and bearing increase
Solution Approach 1:
The patent divides the load support function into two separate components: the motor housing supports radial loads while a dedicated bearing unit supports axial loads. This segmentation allows each component to be optimized for its specific function, preventing the motor housing from needing excessive size and weight to handle axial loads.
Solution Approach 2:
The patent introduces a bearing unit as an intermediary component between the motor and the hydraulic system. This bearing unit specifically handles axial loads from hydraulic reaction forces, freeing the motor housing from supporting these loads and thus reducing its size and weight requirements.
2Manufacturing precision
If assembly single products are used to compensate for coaxiality and perpendicularity of power shaft, then alignment is improved, but quality management area increases and axial length of power transmission structure cannot be reduced
Solution Approach 1:
The patent combines multiple alignment functions into the bearing unit itself. The bearing unit simultaneously provides axial load support, coaxiality compensation, and perpendicularity maintenance, eliminating the need for separate assembly single products and reducing quality management complexity.
Solution Approach 2:
The bearing unit is designed as a multi-functional component that performs multiple tasks: supporting axial loads, maintaining coaxiality between power shafts, and ensuring perpendicularity. This universal design reduces the number of separate components needed for alignment compensation.
3Strength
If the motor supports axial load, then hydraulic reaction force is contained, but the size and weight of motor housing and bearing increase
Solution Approach 1:
The patent segments the force containment function by assigning radial force support to the motor housing and axial force support to a dedicated bearing unit. This allows the motor housing to be lighter since it only needs to handle radial loads, while the bearing unit specifically manages axial hydraulic reaction forces.
Solution Approach 2:
The bearing unit acts as an intermediary that specifically handles axial hydraulic reaction forces, allowing the motor housing to maintain sufficient strength for radial loads without needing to be oversized for axial force containment.
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 design reduces the weight and size of the motor and bearing units, lowers costs, and minimizes the axial length of the power transmission structure by eliminating the need for separate axial alignment assemblies and concentric compensations.
Implementation Method 1
a nut unit coupled to the screw shaft through a ball member and reciprocates in an axial direction of the screw shaft according to a rotation direction of the screw shaft
Implementation Method 2
an axial load when forming hydraulic pressure of the cylinder unit
Data Source
AI summary
A brake device for a vehicle includes a housing unit, a cylinder unit installed inside the housing unit, a motor unit connected to the cylinder unit and provides a rotational force, a screw shaft provided inside the cylinder unit and axially rotated by receiving the rotational force of the motor unit, a nut unit coupled to the screw shaft through a ball member and reciprocated in an axial direction of the screw shaft according to a rotation direction of the screw shaft, a piston unit coupled to the nut unit and moving in conjunction with the nut unit, and a bearing unit provided inside the cylinder unit, coupled to the screw shaft, and supporting an axial load when forming hydraulic pressure of the cylinder unit.