High Pressure Pump Lubricating Cooling Structure
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Solution Overview
Problem
High pressure pumps used in vehicle fuel systems require a low volume and light weight design while ensuring efficient operation and durability, and minimizing fuel compression to reduce energy consumption and CO2 emissions.
Innovation Solution
A high pressure pump with a lubricating and cooling structure, featuring a camshaft, roller bearing, inlet and outlet conduits that change direction multiple times, and a direct port for high pressure fluid supply, minimizing volume and weight while allowing minimal fuel compression and efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the high pressure pump is designed with minimal volume and light weight, then the pump size and mass are reduced, but the lubricating and cooling requirements become more difficult to satisfy
Solution Approach 1:
The patent combines the lubrication system and cooling system into a single integrated structure. The inlet conduit serves dual purposes: supplying fuel to the roller bearing for lubrication and cooling the pump body. The outlet conduit similarly serves both to remove lubricated fuel and to provide cooling pathways. This merging eliminates the need for separate lubrication and cooling systems, maintaining reliability while minimizing volume.
Solution Approach 2:
The fuel serving as lubricant also serves as coolant. The inlet conduit and outlet conduit are designed to perform multiple functions: fuel delivery, lubrication, and thermal management. The conduit structure itself acts as both a flow path and a cooling channel, maximizing the utility of each component and reducing the need for additional dedicated cooling components.
2Use of energy by moving object
If the low pressure pump compresses the fuel minimally, then energy consumption and CO2 emissions are reduced, but the high pressure pump operation efficiency may be affected
Solution Approach 1:
The patent optimizes the pressure parameters at different stages of the fuel delivery system. The low pressure pump is designed to provide just sufficient pressure for the high pressure pump to operate efficiently, rather than over-compressing the fuel. The orifice and conduit system are designed to maintain optimal pressure differentials, ensuring that the high pressure pump receives fuel at the ideal pressure level for maximum efficiency with minimal energy input.
3Temperature
If the inlet conduit and outlet conduit are designed to change direction multiple times around the roller bearing, then cooling effectiveness is improved, but the device complexity increases
Solution Approach 1:
The cooling function is merged into the existing fuel delivery conduits rather than being implemented as a separate cooling system. The inlet conduit and outlet conduit are routed to pass around the roller bearing, utilizing the fuel flow within these existing structures to provide cooling. This approach improves cooling effectiveness without adding the complexity of dedicated cooling channels or separate cooling systems.
Solution Approach 2:
The fuel itself serves as the cooling medium, eliminating the need for external cooling systems. The conduit routing allows the fuel to naturally cool the pump body and roller bearing area as it flows through the system. The system uses its own operational fluid (fuel) to provide thermal management, reducing the need for additional cooling components and simplifying the overall device structure.
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
The design achieves minimal volume and weight, efficient operation, and reduced energy consumption, leading to decreased CO2 emissions and lower operational expenses by effectively cooling and lubricating the pump with minimal fuel compression.
Implementation Method 1
an orifice configured to supply the fluid to the roller bearing while reducing a pressure of the fluid introduced via the inlet port
Implementation Method 2
the outlet conduit may extend from the roller bearing to the outlet port and may function as a flowing conduit of the fluid, the outlet conduit being configured to change a direction thereof several times at a location around the roller bearing, thereby contributing to cooling of the high pressure pump
Implementation Method 3
The inlet conduit leading the fluid from the inlet port to the roller bearing may be configured to lead the fluid to the roller bearing after reciprocating while passing at least one time around a part of the pump body proximate to (e.g., disposed next to) the camshaft based on the camshaft, so that the fluid cools the high pressure pump
Implementation Method 4
a roller bearing rotatably supporting the camshaft in the pump body
Implementation Method 5
an orifice configured to supply the fluid to the roller bearing
Data Source
AI summary
A high pressure pump is provided to be used in a fuel feeding system for a vehicle engine and receive a fuel primarily pressurized by a low pressure pump, and secondarily compresses the fuel to increase the pressure of the fuel for supplying the fuel to a fuel injector. The high pressure pump includes a pump body and a camshaft that is rotatably installed in the pump body to be rotated using torque transmitted from an exterior of the pump body. Additionally, a roller bearing rotatably supports the camshaft in the pump body and an inlet port is disposed on the pump body to introduce a primarily pressurized fluid into the pump body. An orifice is configured to supply the fluid to the roller bearing while reducing a pressure of the fluid introduced via the inlet port.