Double-Flow Sliding Vane Pump in Hybrid Transmission
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Solution Overview
Problem
The integration of hybridized transmission devices into existing vehicle systems is hindered by limited installation space and the need to maintain a defined ground clearance line, while also facing challenges in avoiding cavitation in sliding vane pumps, which affects service life and maintenance costs.
Innovation Solution
The sliding vane pump is relocated from the intermediate plate to the oil pan, with an oblique configuration of the suction and suction loading paths within the oil pan, allowing for a longer blending path without increasing the vehicle's vertical dimensions, and incorporating a sealing gap for efficient hydraulic fluid management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the sliding vane pump is positioned above the oil pan in the housing, then hydraulic fluid can be supplied to the suction sides via an annular chamber, but the transmission device requires increased vertical dimensions which conflicts with maintaining a defined ground clearance line
Solution Approach 1:
The patent repositions the sliding vane pump from the intermediate plate to the oil pan, and changes the course of the suction area and suction loading from vertical to oblique directions. This dimensional change allows the blending path to extend in an oblique course through the oil pan, achieving the required blending path length without increasing the vertical height of the transmission device, thus maintaining the defined ground clearance line.
2Length of stationary object
If the sliding vane pump is relocated to the oil pan with oblique configuration, then a longer blending path is achieved without increasing vertical dimensions, but the device complexity increases due to reconfiguration of suction paths and sealing gap implementation
Solution Approach 1:
The oil pan is designed to serve multiple functions: it acts as both the hydraulic fluid reservoir and the housing for the sliding vane pump, and also provides the path for the suction area and suction loading. This multi-functionality eliminates the need for separate components and simplifies the overall structure despite the oblique configuration, as the same oil pan structure accomplishes what would otherwise require additional parts.
3Reliability
If the cam ring and housing form a sealing gap, then hydraulic fluid is effectively managed and cavitation is prevented, but the manufacturing precision requirements increase to ensure proper sealing
Solution Approach 1:
The patent specifies that the sealing gap between the cam ring and housing should be in the range of 0.05 to 0.2 mm. This parameter change provides a tolerance range that balances effective sealing with manufacturability. The gap is large enough to accommodate normal manufacturing variations and thermal expansion, yet small enough to prevent harmful fluid leakage, thereby maintaining reliability without excessive manufacturing precision requirements.
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 configuration enables a cost-effective, space-efficient integration of hybridized transmission devices into existing systems, maintaining a defined ground clearance and preventing cavitation, thus ensuring a long service life and low maintenance costs.
Implementation Method 1
During operation of the sliding vane pump, the centrifugal force acting on the vanes amplifies the compressive force with which the vanes are pressed against the inner wall of the cam ring, by way of which a seal between the chambers is ensured.
Implementation Method 2
Hydraulic fluid is initially sucked in from the hydraulic fluid reservoir via an inlet area by the sliding vane pump in the direction of the annular chamber. Hydraulic fluid is additionally conducted in the direction of the annular chamber via a so-called suction loading area connected to the pressure side of the sliding vane pump.
Data Source
AI summary
A transmission device (1) has a double-flow sliding vane pump (4). Hydraulic fluid is supplied to suction sides (5A, 5B) of the pump (4) through an inlet area (14) from a hydraulic fluid reservoir (11) and from a suction loading (16) via an annular chamber (7) and pump inlets (9, 10). The annular chamber (7) is delimited by the cam ring (6) and a housing (8) enclosing the cam ring (6). A sealing gap (17) extends in the circumferential direction (U) between one of the pump inlets (10) and a circumferential area (44) of the cam ring (6) delimiting the inlet area (14) from the hydraulic fluid reservoir (11). Courses (19, 20) of the inlet area (14) and of the suction loading (16) installed in the transmission device (1) respectively form a first angle (α) and a second angle (β) with the vertical axis (21) of the transmission device (1).