Dual-Input Gerotor Pump With Cam Ring Variable Output
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Solution Overview
Problem
Existing vehicle fluid pumping systems face inefficiencies due to fixed displacement pumps that waste energy by providing high output when low output is required, and electric motor-driven pumps lack the efficiency of internal combustion engine-driven pumps, with a need for a dual input pump that does not rely on expensive planetary gearsets.
Innovation Solution
A fluid pumping system utilizing a dual input gerotor design with an internal combustion engine and electric motor, featuring a gerotor with an inner rotor circumscribed by an outer rotor and a cam ring, allowing for variable output independent of engine speed without a planetary gearset, and including a housing with multiple fluid inlet passages for efficient fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a fixed displacement pump is used to minimize cost, then manufacturing cost is reduced, but energy waste increases because the pump provides high output when low output is required
Solution Approach 1:
The pump system transitions from a fixed displacement design to a variable displacement design through the introduction of a cam ring that can be positioned at different angles. This allows the pump to dynamically adjust its output volume based on actual system requirements, reducing energy waste while maintaining cost-effectiveness through a relatively simple mechanical adjustment mechanism
2Adaptability or versatility
If a pump is driven solely by an electric motor to provide variable output, then output flexibility is improved, but operational efficiency deteriorates compared to internal combustion engine-driven pumps
Solution Approach 1:
The invention merges two power sources (internal combustion engine and electric motor) into a single hybrid drive system for the pump. This combination allows the system to leverage the high efficiency of the internal combustion engine for primary power while using the electric motor to provide variable output control and supplement when needed, achieving both operational efficiency and output flexibility
3Use of energy by moving object
If a dual input pump is designed to improve efficiency and provide variable output, then energy efficiency is improved, but device complexity increases due to the need for multiple power sources
Solution Approach 1:
The cam ring serves as an intermediary mechanism that simplifies the dual-input power system. By positioning the cam ring at different angles, the system can control which power source (engine or motor) drives the pump and at what displacement level, reducing the complexity of directly coordinating two power sources to the pump
4Power
If a planetary gearset is used in the dual input pump to transmit power, then power transmission capability is improved, but manufacturing cost and packaging space increase
Solution Approach 1:
The invention extracts and eliminates the planetary gearset from the dual input pump design. Instead of using this complex gear mechanism for power transmission, the system uses a simpler direct-drive arrangement with the cam ring positioning mechanism to achieve the same power transmission and variable displacement functions, thereby reducing manufacturing cost and packaging space
Data Source
AI summary
A fluid pumping system comprises a housing, an electric motor, a rotatable first input, a rotatable second input driven by the electric motor, a gerotor including an inner rotor, an outer rotor; and a cam ring in sliding receipt of the outer rotor. The cam ring is selectively rotatable by one of the first input and the second input. The inner rotor is rotatable by the other of the first input and the second input. The housing includes a first fluid inlet passage on a first side of the cam ring and a second fluid inlet passage on an opposite side of the cam ring. Fluid entering a cavity between the inner rotor and the outer rotor flows parallel to the axis of rotation of the first input. The cam ring includes a radially extending outlet port and pumped fluid flows radially out of the cavity.