Hydraulic Pressure Control Unit Pulsation Reduction
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Solution Overview
Problem
Conventional straddle-type vehicle brake systems face challenges in reducing pulsations caused by plunger pumps, which lead to rider discomfort, and require enlargement of the hydraulic pressure control unit to accommodate an auxiliary plunger pump, complicating space constraints and motor sizing.
Innovation Solution
A compact hydraulic pressure control unit design featuring a first and second plunger pump, accumulators, and a common motor drive, with the auxiliary plunger pump positioned in a third pump hole, dispersing reaction forces and simplifying channels to maintain unit compactness and suppress pulsations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an auxiliary plunger pump is added to reduce pulsations, then rider comfort is improved, but the hydraulic pressure control unit becomes extremely enlarged
Solution Approach 1:
The auxiliary plunger pump is nested within the existing hydraulic pressure control unit structure, specifically utilizing the space around the motor and integrating with the common drive mechanism. This allows the auxiliary pump to be accommodated without significantly enlarging the overall unit volume, resolving the contradiction between pulsation reduction and compactness.
Solution Approach 2:
The auxiliary plunger pump and the main plunger pump are merged into a single integrated system with a common motor drive. The pumps share common structural elements, fluid passages, and control mechanisms, allowing pulsation reduction through coordinated operation while maintaining a compact unit size through component consolidation.
2Productivity
If a high-output motor is used to secure conveyance force, then pumping performance is improved, but the motor size and power consumption increase
Solution Approach 1:
The auxiliary plunger pump operates in different phases from the main plunger pump, creating periodic complementary action. This phased operation ensures continuous fluid conveyance without requiring peak power from a single high-output motor, thereby reducing overall motor size and power consumption while maintaining adequate conveyance force.
Solution Approach 2:
The auxiliary plunger pump performs preliminary pumping action during phases when the main pump is not actively conveying fluid. This preliminary action ensures continuous fluid flow and maintains conveyance force without requiring the motor to operate at maximum output continuously, thereby reducing the required motor size and power consumption.
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 effectively reduces pulsations and maintains a compact unit size, addressing space constraints and rider discomfort while ensuring efficient braking operations.
Implementation Method 1
a first plunger pump and an auxiliary plunger pump provided in the first secondary channel
Implementation Method 2
a second plunger pump provided in the second secondary channel
Implementation Method 3
a first accumulator that stores the brake fluid in a portion of the first secondary channel upstream of the first plunger pump and the auxiliary plunger pump
Implementation Method 4
a second accumulator that stores the brake fluid in a portion of the second secondary channel upstream of the second plunger pump
Implementation Method 5
a motor as a common drive source of the first plunger pump, the auxiliary plunger pump, and the second plunger pump
Data Source
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AI summary
To acquire a hydraulic pressure control unit and a straddle-type vehicle brake system capable of adding an auxiliary plunger pump while suppressing extreme enlargement of the hydraulic pressure control unit. In a base body, a combination of a first plunger pump and a first accumulator and a combination of a second plunger pump and a second accumulator for a different system of a hydraulic circuit therefrom are separately provided on both sides of a reference surface including a center axis of a motor hole. A first plunger pump hole and a second plunger pump hole are separately provided on a second surface and a third surface constituting both ends of the base body in a first direction. A first accumulator hole, a second accumulator hole, and an auxiliary plunger pump hole are provided on a fourth surface constituting an end of the base body in a second direction.