Brake Hydraulic Return Line One-Way Valve for Pedal Rigidity
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Solution Overview
Problem
Existing vehicle brake hydraulic pressure control systems absorb hydraulic pressure output from the master cylinder when brakes are applied, leading to a reduction in brake pedal operation feeling rigidity, which is undesirable.
Innovation Solution
A vehicle brake hydraulic pressure control apparatus featuring a reservoir, hydraulic pressure pump, orifice, damper, and one-way valve, where the one-way valve is placed between the damper and orifice in the return line to prevent hydraulic fluid flow from the orifice side to the damper side, ensuring hydraulic pressure output from the master cylinder is not absorbed by the damper, thus maintaining pedal rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a damper is connected to the return line between the orifice and the hydraulic pressure pump, then discharge pressure pulsation of the hydraulic pressure pump is damped, but hydraulic pressure output from the master cylinder is absorbed by the damper, reducing brake pedal operation feeling rigidity
Solution Approach 1:
The return line is segmented into multiple sections with different functions: one section contains the orifice for pressure regulation, another section contains the one-way valve for flow direction control, and a third section contains the damper for pulsation damping. This segmentation allows each component to perform its specific function without interfering with others, particularly preventing the damper from absorbing master cylinder output pressure while still damping pump discharge pulsations.
Solution Approach 2:
The one-way valve acts as an intermediary component between the orifice and the damper. It mediates the hydraulic flow by allowing it to pass from the orifice side to the damper side during pump discharge, but preventing reverse flow that would cause the damper to absorb master cylinder output pressure. This intermediary function resolves the contradiction by enabling pulsation damping while protecting brake pedal rigidity.
2Reliability
If the damper is placed in the return line to damp pressure pulsation, then pressure stability is improved, but the damper absorbs hydraulic pressure from the master cylinder, causing loss of braking force sensation
Solution Approach 1:
Instead of placing the damper directly in the main return line where it would absorb master cylinder output pressure, the invention inverts the flow control approach by introducing a one-way valve that allows the damper to function only for pump discharge pulsations. The one-way valve inverts the normal bidirectional flow restriction into a unidirectional flow path, enabling the damper to stabilize pressure without compromising braking force transmission.
3Ease of operation
If a one-way valve is added to prevent hydraulic flow from orifice side to damper side, then brake pedal operation feeling is improved, but device complexity increases
Solution Approach 1:
The one-way valve is integrated into the existing return line system to perform multiple functions: it prevents reverse flow that would cause damper absorption of master cylinder pressure, allows forward flow during pump discharge for pulsation damping, and maintains system pressure stability. By making this single component multi-functional, the invention improves brake pedal operation feeling without proportionally increasing device complexity.
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 configuration ensures efficient hydraulic pressure supply to the wheel brake, providing a good brake pedal operation feeling by preventing hydraulic pressure absorption by the damper and enhancing damping function while suppressing air bubble generation and reducing system size.
Implementation Method 1
a damper connected to a return line between an orifice and the hydraulic pressure pump and damping discharge pressure pulsation of the hydraulic pressure pump
Implementation Method 2
a one-way valve provided in the return line between the damper and the orifice and preventing a hydraulic flow from an orifice side to a damper side
Implementation Method 3
a reservoir that absorbs an excess brake hydraulic pressure of a wheel brake
Implementation Method 4
the hydraulic pressure pump suctions brake fluid absorbed by the reservoir and returns the suctioned brake fluid to a master cylinder through a return line
Data Source
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AI summary
A vehicle brake hydraulic control apparatus includes a reservoir, a hydraulic pressure pump, an orifice, a damper and a one-way valve. The reservoir absorbs an excess brake hydraulic pressure of a wheel brake. The hydraulic pressure pump suctions brake fluid absorbed by the reservoir and returns the suctioned brake fluid to a master cylinder through a return line. The orifice is provided in the return line. The damper is connected to the return line between the orifice and the hydraulic pressure pump and damps discharge pressure pulsation of the hydraulic pressure pump. The one-way valve is provided in the return line between the damper and the orifice and prevents a hydraulic flow from an orifice side to a damper side.