Hydraulic Device Orifice Pressure Control
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Solution Overview
Problem
The existing hydraulic devices for vehicles require a specially designed check valve with increased opening pressure, leading to increased costs and space requirements, as common check valves cannot be used effectively in these systems.
Innovation Solution
Incorporating an orifice upstream of the discharge valve in the hydraulic device, allowing a discharge valve with common design to be used, which maintains an oil pressure higher than the set pressure, enabling quick and smooth engagement of the vehicle's clutch when starting from an idling stop state and reducing costs by using modularized parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a check valve with increased opening pressure is used to maintain oil pressure in the electromagnetic pump circuit, then the oil pressure can be maintained at a set pressure, but the cost increases and a special check valve design is required
Solution Approach 1:
An orifice is introduced as an intermediary component between the electromagnetic pump and the check valve. This orifice creates a pressure drop that allows a standard check valve to effectively maintain the required oil pressure in the circuit, eliminating the need for a specially designed high-pressure check valve and reducing costs.
Solution Approach 2:
The invention changes the pressure parameters in the circuit by introducing an orifice that creates a controlled pressure drop. This allows the check valve to operate at its standard set pressure while the upstream side maintains a higher pressure, effectively solving the pressure maintenance requirement without needing a special high-pressure check valve.
2Reliability
If a check valve with increased opening pressure is used, then the oil pressure can be maintained, but the space for mounting the check valve increases
Solution Approach 1:
The pressure control function is segmented into two separate components: an orifice for pressure drop and a standard check valve for pressure maintenance. This segmentation allows the use of a compact standard check valve rather than a larger specially designed high-pressure check valve, reducing the mounting space requirement.
3Ease of manufacture
If a common design check valve is used, then cost is reduced and space is saved, but the oil pressure cannot be maintained at the required set pressure
Solution Approach 1:
An orifice is introduced as an intermediary component that creates a pressure drop between the electromagnetic pump and the check valve. This allows a common design check valve to effectively maintain the required oil pressure in the circuit, eliminating the need for a specially designed high-pressure check valve and reducing costs.
4Reliability
If leakage occurs from the switching valve, then oil pressure is lost, but without a check valve the electromagnetic pump cannot maintain pressure
Solution Approach 1:
An orifice is introduced as an intermediary component between the electromagnetic pump and the check valve. This orifice creates a pressure drop that allows a standard check valve to effectively maintain the required oil pressure in the circuit, eliminating the need for a specially designed high-pressure check valve and reducing costs.
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 enables quick vehicle startup without discomfort, reduces costs by using common design parts, and prevents air entry into other oil passages, ensuring the discharge valve's functionality is not compromised.
Implementation Method 1
an orifice is provided upstream of the discharge valve in an oil passage from the electric pump
Implementation Method 2
a discharge valve that communicates with an oil passage from the electric pump and discharges an oil pressure equal to or higher than a set pressure
Data Source
AI summary
A hydraulic device wherein an orifice is provided upstream of the discharge valve in an oil passage from the electric pump, a drain oil passage from the second hydraulic servo communicates between the orifice and the discharge valve in the oil passage from the electric pump, and an oil pressure in the oil passage upstream of the orifice is maintained at a predetermined pressure higher than the set pressure.