Adaptive Lubricant Pump Design for Temperature-Responsive Pressure Control
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Summary
Problems
Existing variable displacement lubricant vane pumps fail to adapt lubricant pressure levels effectively to varying engine working conditions, particularly lubricant temperature, leading to suboptimal performance.
Innovation solutions
Incorporation of a temperature control valve with a bimetal actuator sheet and separate valve plunger, allowing the valve to adjust the fluid passage based on lubricant temperature, ensuring reliable and adaptive pressure control by switching between open and closed positions at specific temperature thresholds.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If a separate valve plunger is used actuated by a bimetal actuator sheet, then reliability is improved and actuation forces are reduced, but device complexity increases
Why choose this principle:
The valve is segmented into two independent components: a bimetal actuator sheet for sensing and actuation, and a separate valve plunger for flow control. This segmentation allows each component to be optimized independently – the actuator sheet provides reliable temperature-responsive actuation with low forces, while the plunger provides precise valve function.
Principle concept:
If a separate valve plunger is used actuated by a bimetal actuator sheet, then reliability is improved and actuation forces are reduced, but device complexity increases
Why choose this principle:
The bimetal actuator sheet acts as an intermediary between the temperature field and the valve plunger. It converts temperature changes into mechanical displacement, indirectly actuating the valve plunger without requiring direct thermal contact or high actuation forces on the plunger itself.
Application Domain
Data Source
AI summary:
Incorporation of a temperature control valve with a bimetal actuator sheet and separate valve plunger, allowing the valve to adjust the fluid passage based on lubricant temperature, ensuring reliable and adaptive pressure control by switching between open and closed positions at specific temperature thresholds.
Abstract
The invention refers to a variable displacement lubricant pump (10) for providing pressurized lubricant for an internal combustion engine (70), whereby a pump rotor with several slidable vanes (14) rotating in a shiftable control ring (12) is provided, the control ring (12) being actuated by a hydraulic control chamber (25) directly actuating the control ring (12), whereby a temperature control opening (26) is provided in a control chamber wall (27), a temperature control valve (30) is provided to connect or disconnect the temperature control opening (26) to atmospheric pressure, and the temperature control valve (30) is provided with a valve plunger (32) being axially shiftable and blocking or leaving open a fluid passage (39), and with a first bimetal actuator sheet (35;42) directly actuating the valve plunger (32) and having a first switching temperature TS1 so that the valve plunger (32) is in its open position if the lubricant temperature T is above the first switching temperature TS1.