Brake Piston Pump Assembly With Localized Polishing
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Solution Overview
Problem
Conventional piston pumps for brake systems face challenges such as high defect rates and increased manufacturing costs due to complex shapes and the need for extensive polishing processes.
Innovation Solution
The proposed piston pump features a simplified assembly-type piston unit with a reduced polishing process, focusing only on areas where friction occurs, and a check valve unit to manage brake oil pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a polishing process is performed on the entire piston body to reduce friction, then the reciprocating movement becomes smooth, but the manufacturing complexity and defect rate increase
Solution Approach 1:
The patent applies polishing only to the specific outer circumferential surface area that contacts the low pressure sealing, rather than the entire piston body. This localized approach reduces manufacturing complexity while maintaining smooth reciprocating movement where friction occurs.
Solution Approach 2:
The piston body is divided into functional zones: the outer circumferential surface requiring polishing for friction reduction, and other surfaces that do not require polishing. This segmentation allows selective application of the polishing process only where necessary.
2Ease of operation
If a polishing process is performed on the entire piston body, then friction is reduced, but manufacturing efficiency decreases due to unnecessary polishing
Solution Approach 1:
The patent applies polishing only to the specific outer circumferential surface area that contacts the low pressure sealing, rather than the entire piston body. This localized approach reduces manufacturing complexity while maintaining smooth reciprocating movement where friction occurs.
Solution Approach 2:
Instead of performing a complete polishing process on the entire piston body (excessive action), the patent applies polishing only to the necessary contact surface area (partial action), eliminating unnecessary polishing steps and improving manufacturing efficiency.
3Adaptability or versatility
If the piston unit includes a complex shape with cap coupling portion, step unit, and piston flange, then functional requirements are met, but manufacturing costs increase
Solution Approach 1:
The piston unit is divided into separate components: the piston body, cap coupling portion, step unit, and piston flange are manufactured separately and then assembled. This segmentation allows each component to be manufactured using simpler, more cost-effective processes while maintaining the necessary functional capabilities.
Solution Approach 2:
Multiple functional components (cap coupling portion, step unit, piston flange) are combined through assembly rather than being integrated into a single complex monolithic structure. This approach reduces manufacturing costs by allowing each component to be produced independently using optimized processes.
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 lowers defect rates and manufacturing costs while improving efficiency by simplifying the manufacturing process and eliminating unnecessary polishing.
Implementation Method 1
an inlet spring configured to press the piston unit in the initial position direction
Implementation Method 2
a motor cam configured to perform cam movement by driving of a motor
Implementation Method 3
a second piston having a first end coupled to a second end of the first piston and operating in conjunction with reciprocating movement of the first piston to press the brake oil stored in the accommodation space of the sleeve unit
Data Source
AI summary
According to at least one aspect, the present disclosure provides a piston pump comprising: a piston unit configured to reciprocate by driving of a motor cam; a sleeve unit disposed to surround at least a part of the piston unit and having a space in which brake oil is stored; and a check valve unit facing the sleeve unit and discharging the brake oil to an outside of the sleeve unit when a pressure of the brake oil increases, wherein the piston unit includes a first piston having a first end in contact with the motor cam and reciprocating, a second piston having a first end coupled to a second end of the first piston and configured to press the brake oil, and a spring cap coupled to a second end of the second piston and disposed to accommodate an inlet spring therein.