Vacuum Pump Lubrication Conduit for Drive Coupling Wear
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Solution Overview
Problem
Automotive vacuum pumps face challenges in lubricating drive couplings due to positioning constraints and types of pumps that do not require oil introduction into the pump cavity, leading to excessive wear and insufficient vacuum sources, especially in diesel engines.
Innovation Solution
An automotive vacuum pump design featuring a lubrication conduit that supplies lubricating fluid directly to the coupling arrangement, independent of the pump cavity, with sections aligned parallel and coaxial with the rotor's axis, ensuring effective lubrication of engagement faces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the pump outlet is positioned to direct oil onto the drive coupling for lubrication, then the drive coupling is lubricated, but the pump mounting position and configuration constraints prevent proper oil direction
Solution Approach 1:
The lubrication system is segmented into a separate lubrication conduit independent from the main pump cavity oil supply. This allows the lubrication function to be decoupled from the vacuum pumping function, enabling oil to be directed specifically to the drive coupling without being constrained by the pump's mounting position or cavity configuration.
Solution Approach 2:
A dedicated lubrication conduit acts as an intermediary element between the oil supply and the drive coupling. This intermediary component provides a controlled path for oil delivery, ensuring proper lubrication regardless of the pump's position or mounting configuration in the engine bay.
2Reliability
If oil is introduced into the pump cavity to seal clearances, then sealing is improved, but the oil cannot be effectively used to lubricate the drive coupling
Solution Approach 1:
The oil supply system is segmented into two separate pathways: one for sealing the pump cavity clearances and another for lubricating the drive coupling. This segmentation allows each function to be optimized independently, ensuring both effective sealing and adequate lubrication without interference between the two systems.
Solution Approach 2:
Different regions of the pump system are provided with different lubrication characteristics. The pump cavity receives oil for sealing purposes, while the drive coupling receives oil through a dedicated conduit for lubrication purposes. This local differentiation ensures each component receives the appropriate type and amount of lubrication.
3Device complexity
If a pump type without oil introduction is used, then the pump structure is simplified, but there is no oil available to lubricate the drive coupling
Solution Approach 1:
The lubrication conduit serves as an intermediary that introduces oil to the drive coupling independently of the pump cavity oil introduction system. This allows simplified pump structures that do not require oil in the cavity while still providing necessary lubrication to the drive coupling through the separate conduit pathway.
Solution Approach 2:
The lubrication function is extracted from the pump cavity oil supply system and placed into a separate, dedicated lubrication conduit. This extraction allows the pump structure to remain simplified without cavity oil introduction while still achieving drive coupling lubrication through the independent conduit system.
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 solution ensures reliable lubrication of drive couplings, reducing wear and maintaining pump efficiency even in conditions where vacuum sources are insufficient, applicable to various pump types and engine configurations.
Implementation Method 1
a lubrication conduit for the supply of lubricating fluid to the coupling arrangement from within the vacuum pump
Data Source
AI summary
An automotive vacuum pump includes a casing defining a cavity, the casing having an inlet and an outlet, wherein the cavity contains a rotor extending through a side of the casing to the exterior thereof and being provided with a coupling arrangement to couple the rotor to a drive member. The vacuum pump is provided with a lubrication conduit for the supply of lubricating fluid to the coupling arrangement from within the vacuum pump.