Segmented Piston Pump for Brake Motor Load Reduction
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Solution Overview
Problem
Piston pumps for vehicle brakes face challenges in increasing discharge rate while maintaining motor durability, as larger piston diameters lead to increased pressure loads on the motor, resulting in higher costs and weight.
Innovation Solution
A piston pump design that allows both outer and inner pistons to operate at low pressure, and only the inner piston to operate at high pressure, utilizing a piston housing with an outer and inner return spring system to manage piston movement and reduce motor load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the outer diameter of the piston is increased to increase discharge volume, then the discharge amount of the pump is improved, but high pressure is applied to the outlet and pressure load on the piston is increased, resulting in high load on the motor and deteriorated motor durability
Solution Approach 1:
The piston is divided into an outer piston and an inner piston that operate independently. The outer piston has a larger diameter for high discharge volume, while the inner piston has a smaller diameter. This segmentation allows the system to achieve high discharge amount without requiring the entire piston to operate at high pressure continuously, thereby reducing the motor load and improving motor durability.
2Productivity
If the outer diameter of the piston is increased to improve motor performance, then the discharge rate is increased, but the price and weight of the motor are increased
Solution Approach 1:
By segmenting the piston into outer and inner pistons with different diameters, the system can achieve high discharge rates using the outer piston during low-pressure conditions without requiring an oversized motor. The inner piston handles high-pressure conditions with reduced load requirements, allowing the use of a smaller, lighter motor while maintaining high productivity.
3Productivity
If the outer diameter of the piston is increased to increase discharge volume, then the pump performance is improved, but a high load is applied to the motor
Solution Approach 1:
The piston is segmented into outer and inner pistons that can operate independently based on pressure conditions. The outer piston with larger diameter provides high discharge volume during low-pressure operation, while the inner piston with smaller diameter operates during high-pressure conditions with reduced force requirements, thereby maintaining high productivity while reducing motor load.
Solution Approach 2:
The system dynamically switches between outer piston operation and inner piston operation based on the pressure conditions at the outlet. This dynamic operation allows the pump to optimize its discharge volume and motor load in real-time, achieving high productivity without subjecting the motor to continuously high loads.
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 enhances discharge rate at low pressure and reduces motor load at high pressure, thereby improving pump efficiency and motor durability without increasing motor capacity or weight.
Implementation Method 1
an outer return spring supporting a tip portion of the outer piston
Implementation Method 2
an inner return spring supporting a tip portion of the inner piston
Implementation Method 3
a piston rod spring supporting rear end portions of the outer piston and the inner piston
Data Source
AI summary
A piston pump for a brake including: a piston housing; an outer piston which rectilinearly reciprocates in the piston housing; an inner piston which is coupled to an inner portion of the outer piston, and rectilinearly reciprocates together with the outer piston in a state in which the inner piston is coupled to the inner portion of the outer piston, or rectilinearly reciprocates alone in a state in which the outer piston is stopped; an outer return spring which supports a tip portion of the outer piston; an inner return spring which supports a tip portion of the inner piston; and a piston rod spring which supports rear end portions of the outer piston and the inner piston.