Vane Pump Rear Vane Pressure Control for Low-Loss Sealing
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Solution Overview
Problem
Vane pumps face challenges in maintaining a reliable seal between vanes and the lifting ring across various operating ranges without compromising efficiency and wear behavior, particularly due to excessive pressure-side rear wing pressure that increases power loss, wear, and noise at higher speeds and low temperatures.
Innovation Solution
The vane pump features an adjustable valve device between the pressure-side and suction-side rear wing pressure channels, allowing the pressure-side rear wing pressure to be set to a constant or variable value, reducing hydraulic resistance to match the pump pressure, thereby limiting the pressure-side rear wing pressure and optimizing sealing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressure-side rear vane pressure is increased to maintain reliable sealing at low rotational speeds, then the sealing reliability is improved, but the power loss and wear increase at higher speeds
Solution Approach 1:
The patent applies dynamics by making the rear vane pressure adjustable rather than fixed. The control device modifies the hydraulic resistance in the pressure-side rear vane pressure channel based on operating conditions, allowing the pressure to adapt dynamically. At low speeds, higher pressure ensures reliable sealing, while at high speeds, reduced pressure minimizes power loss and wear.
Solution Approach 2:
The patent changes the pressure parameter of the rear vane pressure system from a constant value to a variable value. By using a control device that adjusts hydraulic resistance, the pressure on the pressure side of the rear vane can be optimized for different operating ranges, resolving the contradiction between sealing reliability and energy efficiency.
2Productivity
If the pressure-side rear vane pressure is increased to ensure contact force at low speeds, then the volumetric efficiency is improved, but the wear and noise increase at higher speeds
Solution Approach 1:
The control device dynamically adjusts the pressure-side rear vane pressure based on rotational speed. At low speeds, increased pressure maintains vane contact with the hub ring, ensuring high volumetric efficiency. At high speeds, the pressure is reduced to minimize wear and noise while maintaining sufficient contact force.
Solution Approach 2:
The patent varies the pressure parameter in the pressure-side rear vane pressure channel according to operating conditions. This parameter change allows optimization of volumetric efficiency at low speeds while reducing harmful effects like wear and noise at high speeds.
3Force
If the hydraulic resistance in the pressure-side rear vane pressure channel is increased to raise the pressure, then the sealing force is improved, but the power loss increases
Solution Approach 1:
The control device dynamically adjusts the hydraulic resistance in the pressure-side rear vane pressure channel. By modifying the resistance based on operational requirements, the system can generate sufficient sealing force when needed while minimizing energy losses during normal operation.
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 a reliable seal across multiple operating ranges while minimizing power loss, wear, and noise, maintaining overall efficiency and extending the service life of the vane pump by dynamically adjusting the rear wing pressure based on operating conditions.
Implementation Method 1
the radially inward-facing side of a vane, hereinafter referred to as the vane's inner surface, is subjected to rear vane pressure, causing the vane to be pressed outwards against the hub ring
Implementation Method 2
Generally, centrifugal force pushes the vanes radially outwards against the hub ring during operation
Implementation Method 3
the pressure-side rear vane pressure channel has a hydraulic resistance, in particular a throttle, by means of which the pressure-side rear vane pressure can be limited
Data Source
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AI summary
A vane pump (101) for an automatic transmission comprises a suction-side behind-vane pressure duct (112) and a pressure-side behind-vane pressure duct (111), wherein the suction-side behind-vane pressure duct (112) is connected to the pressure side (116) of the vane pump (1). According to the invention, the vane pump (101) has a valve device (113, 114), to which the pressure-side behind-vane pressure duct (111) is connected, wherein, 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) by means of the valve device (113, 114).