Brake Hydraulic Pump Phasing to Protect Suction Valve Diaphragms
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Solution Overview
Problem
The pump used in vehicle brake hydraulic pressure control devices tends to cause pulsation during operation, which affects the durability of the diaphragm in the suction valve due to its plunger-type design with check valves at intake and discharge ports.
Innovation Solution
A vehicle brake hydraulic pressure control device is designed with a pair of pumps having discharge cycles shifted by half a cycle, driven by a single source, and featuring a suction valve with a diaphragm that opens by pressure difference, reducing pulsation transmission to the diaphragm and enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single plunger-type pump with check valves is used, then the pump structure is simple, but pulsation is generated during operation which reduces diaphragm durability
Solution Approach 1:
The single pump is divided into two pump heads that operate independently with staggered discharge cycles. Each pump head has its own plunger and check valves, creating two separate pumping actions that combine to reduce overall pulsation while maintaining the simplicity of a unified pump structure.
Solution Approach 2:
The two pump heads are designed to discharge brake fluid at different phases, with discharge cycles shifted by half a cycle. This periodic staggering ensures that when one pump head is discharging, the other is suctioning, creating a more continuous and smoother overall discharge that reduces pulsation frequency and amplitude.
2Reliability
If a pair of pumps with shifted discharge cycles is used, then pulsation is reduced and diaphragm durability is improved, but the device complexity increases
Solution Approach 1:
Two pump heads are merged into a single integrated pump body that shares a common drive source, intake port, and discharge port. This combination achieves the pulsation-reduction benefits of dual pumps while minimizing the increase in device complexity through shared components and a unified structure.
Solution Approach 2:
The single drive source serves both pump heads simultaneously, and the shared intake and discharge ports handle fluid for both pumping actions. This multi-functionality reduces the number of separate components needed, offsetting the complexity increase from having two pump heads.
3Adaptability or versatility
If two separate drive sources are used for the pair of pumps, then each pump can be independently controlled, but the device size increases and compactness is reduced
Solution Approach 1:
Two drive functions are merged into a single drive source that mechanically or hydraulically actuates both plungers. This integration maintains the ability to control both pump heads while significantly reducing the space required compared to two separate drive motors or actuators.
Solution Approach 2:
The single drive source is designed to perform the function of driving both pump heads, making it a multi-functional component. This universal drive mechanism reduces the overall device volume while still enabling coordinated control of both pumping actions with shifted discharge cycles.
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 improves the durability of the diaphragm by alleviating pulsation from the pumps' operation and allows for a compact, mountable device suitable for vehicles with bar handles like motorcycles, with superior mountability and effective brake fluid management.
Implementation Method 1
the suction valve is configured to be opened by a pressure difference between a brake hydraulic pressure on the master cylinder side and a brake hydraulic pressure on an intake port side of the pumps
Implementation Method 2
at which a vacuum is created when the pumps are operated
Data Source
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AI summary
The present invention improves the durability of a diaphragm in a configuration where a suction valve provided with the diaphragm is provided. This vehicle brake hydraulic pressure control device is provided with a suction valve (6) disposed between a master cylinder (M) and the suction inlet of a pair of pumps (5a, 5b), wherein the suction valve (6) can be opened by a pressure difference between the brake hydraulic pressure on the master cylinder (M) side and the brake hydraulic pressure on the suction inlet side which becomes negative pressure under the actions of the pumps (5a, 5b). Each of the pumps (5a, 5b) is provided with a plunger, a suction valve, and a discharge valve. The pumps (5a, 5b) can discharge a brake liquid to a flow passage connected with the master cylinder (M) and a wheel brake (R), and are configured such that the discharge cycles of the brake liquid are different from each other by half a cycle.