Vane Pump Pressure Control for Behind-Vane Wear Reduction
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Solution Overview
Problem
Vane pumps face inefficiencies and wear issues due to excessive behind-vane pressure at low rotational speeds and varying operating conditions, particularly at low temperatures, leading to increased power loss and reduced service life.
Innovation Solution
A vane pump design incorporating a valve unit that adjusts the hydraulic resistance between the suction-side and pressure-side behind-vane pressure ducts, allowing for variable pressure control to maintain a reliable seal without excessive contact pressure, using adjustable throttle valves or orifices, and potentially temperature-dependent restrictors to manage pressure-side behind-vane pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed hydraulic resistance is used between suction-side and pressure-side behind-vane pressure ducts, then the structure is simple, but excessive behind-vane pressure occurs at low rotational speeds causing power loss and wear
Solution Approach 1:
The patent applies the dynamics principle by replacing the fixed hydraulic resistance with a variable hydraulic resistance that can dynamically adjust its resistance value based on operating conditions. The variable restrictor changes the flow resistance between suction-side and pressure-side behind-vane pressure ducts according to rotational speed, thereby optimizing behind-vane pressure across different operating ranges and reducing power loss at low speeds.
Solution Approach 2:
The patent applies the parameter changes principle by varying the hydraulic resistance parameter of the restrictor based on operating conditions. The variable restrictor modifies the resistance parameter dynamically, allowing the system to adapt behind-vane pressure to different rotational speeds and operating conditions, thus preventing excessive pressure and reducing energy loss.
2Reliability
If high behind-vane pressure is maintained to ensure reliable seal at low speeds, then sealing reliability improves, but wear and power loss increase
Solution Approach 1:
The variable restrictor dynamically adjusts hydraulic resistance to optimize behind-vane pressure for different operating conditions. At low rotational speeds, it maintains higher pressure for reliable sealing, while at higher speeds, it reduces pressure to minimize wear on the cam ring and vanes, thereby extending service life.
Solution Approach 2:
The system changes the hydraulic resistance parameter of the restrictor based on operating conditions to achieve optimal behind-vane pressure. This parameter adjustment ensures sufficient pressure for sealing reliability when needed while preventing excessive pressure that would cause wear, thus extending component service life.
3Reliability
If high behind-vane pressure is applied to maintain seal at low temperatures, then sealing reliability improves, but power loss increases
Solution Approach 1:
The variable restrictor responds to temperature changes by adjusting its hydraulic resistance parameter. At low temperatures, it maintains higher resistance to ensure sufficient behind-vane pressure for reliable sealing, while at higher temperatures, it reduces resistance to minimize power loss, optimizing the balance between sealing and energy efficiency across temperature ranges.
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 design ensures a reliable seal across all operating ranges while minimizing power loss and wear, maintaining efficiency and extending the service life of the vane pump by dynamically adjusting pressure-side behind-vane pressure based on operating conditions.
Implementation Method 1
A valve unit is provided with which a pressure-side behind-vane pressure in the pressure-side behind-vane pressure duct can be adjusted during operation
Implementation Method 2
In principle, the vanes are pressed, during operation, by the centrifugal force radially outward against the cam ring
Data Source
AI summary
A vane pump (101) for an automatic transmission includes a suction-side behind-vane pressure duct (112) and a pressure-side behind-vane pressure duct (111). The suction-side behind-vane pressure duct (112) is connected to the pressure side (116) of the vane pump (1). A valve device (113, 114) is connected to the pressure-side behind-vane pressure duct (111). During operation of the vane pump (101), a pressure-side behind-vane pressure (p DH) can be set in the pressure-side behind-vane pressure duct (111) with the valve device (113, 114).