Motor-Stator Pump Inlet Layout for Cold-Oil Transmission
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Solution Overview
Problem
At low temperatures, the viscosity of oil increases, leading to a decrease in the discharge amount of pumps, which affects the efficiency of power transmission devices.
Innovation Solution
A power transmission device configuration where the motor, gear mechanism, and pump are arranged such that the shortest distance between the open end of the pump inlet and the motor's stator is shorter than the distance to the gear mechanism, ensuring effective oil suction and discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pump inlet is positioned away from the gear mechanism to avoid interference, then the gear mechanism can operate smoothly, but the discharge amount of the pump decreases at low temperatures due to increased oil viscosity
Solution Approach 1:
The pump inlet is positioned in the axial direction of the motor rather than in the radial direction away from the gear mechanism. This dimensional change allows the pump to suction oil from a different spatial location (near the stator) without interfering with the gear mechanism's radial operation, thereby maintaining discharge amount at low temperatures while ensuring smooth gear operation.
2Productivity
If the pump inlet is positioned closer to the gear mechanism to increase oil suction, then the discharge amount improves, but the gear mechanism operation is interfered with
Solution Approach 1:
Instead of positioning the pump inlet closer to the gear mechanism in the radial direction (which would cause interference), the inlet is positioned in the axial direction near the motor stator. This dimensional repositioning allows the pump to access oil from a different spatial zone that is close to the heat source without encroaching on the gear mechanism's operational space.
3Reliability
If the pump inlet is positioned far from the motor to avoid heat interference, then the gear mechanism operates smoothly, but the pump discharge amount decreases at low temperatures
Solution Approach 1:
The pump inlet is repositioned from a radial position far from the motor to an axial position near the motor stator. This dimensional change places the pump inlet in close proximity to the heat source (stator) in the axial direction, allowing effective oil suction at low temperatures while the radial clearance from the gear mechanism is maintained through proper spatial arrangement.
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 reduces the decrease in pump discharge amount at low temperatures, maintaining the efficiency of the power transmission device by ensuring adequate oil flow.
Implementation Method 1
an oil pump that sucks oil through a pump inlet
Implementation Method 2
When a temperature is low, viscosity of an oil may increase... A shortest distance between an open end of the pump inlet and a surface of a stator of the motor is shorter than a shortest distance between the open end of the pump inlet and a surface of the gear mechanism
Data Source
AI summary
A power transmission device includes a motor, a gear mechanism connected downstream of the motor; and a pump that sucks oil through a pump inlet. A shortest distance between an open end of the pump inlet and a surface of a stator of the motor is shorter than a shortest distance between the open end of the pump inlet and a surface of the gear mechanism.