Motor Pump Adapter Sealing and Flushing for Compact Couplings
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Solution Overview
Problem
Existing motor pump units face issues with high wear and inefficiency due to hydrodynamic/hydrostatic mounting of pump shafts, leading to premature seal failure and high inertia in force-locking couplings, which are unsuitable for compact applications like hydrostatic transmissions and hydraulic compact axles.
Innovation Solution
An adapter with a motor shaft seal and fluid channels that utilize the pump operating fluid for lubrication and flushing, reducing wear and eliminating the need for additional oil, while allowing for modular assembly and compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pump shaft seal is used on the pump shaft, then the pump operating fluid can be sealed, but the seal experiences high wear due to radial movement and hydrodynamic mounting
Solution Approach 1:
The patent introduces an adapter as an intermediary component between the motor shaft and pump shaft. The motor shaft seal is arranged on the motor shaft within the adapter, which is ball-bearing mounted and thus experiences minimal play. This intermediary arrangement allows the seal to seal the pump operating fluid while being protected from the high wear conditions that would occur if the seal were directly on the radially moving pump shaft.
2Force
If force-locking couplings are used to connect motor and pump, then torque can be transmitted, but the coupling becomes very large and long with high inertia
Solution Approach 1:
The patent merges the adapter with the motor shaft and pump shaft connection system. The adapter housing integrates the motor shaft seal receptacle, fluid channels, and coupling unit reception. This merging allows the coupling unit to be compact while still transmitting torque effectively, eliminating the need for large, separate force-locking coupling components.
3Quantity of substance
If pump operating fluid is used for lubrication and flushing, then additional oil is eliminated, but the fluid channels must be properly designed to achieve effective lubrication and flushing
Solution Approach 1:
The patent makes the pump operating fluid serve multiple functions: it acts as the hydraulic working fluid for the pump, simultaneously serves as lubricant for the motor shaft seal and coupling unit, and provides flushing to remove contaminants. The adapter is designed with integrated fluid channels that distribute the pump operating fluid to these different functions, eliminating the need for separate lubrication oil while using the existing pump fluid for multiple purposes.
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
The adapter extends the service life of the motor shaft seal and coupling unit, reduces wear, and maintains a compact, efficient design without additional oil requirements, suitable for hydrostatic transmissions and hydraulic compact axles.
Implementation Method 1
a motor shaft seal, preferably a radial shaft sealing ring, arranged on or in the seal receptacle, in particular a dynamic one, preferably a radial shaft seal, arranged on or in the seal receptacle, for arrangement on the motor shaft and for sealing the recess in the direction of the motor-side end face
Implementation Method 2
The coupling unit arranged there can be lubricated by means of the pump operating fluid. A wet coupling unit has less fretting rust and less wear.
Implementation Method 3
the pump operating fluid, after passing through the coupling unit, can be transported away by means of the second fluid channel and returned by means of the second fluid connection of the pump unit. This creates an additional flushing effect on the coupling unit, which transports dirt and particles accumulating in the recess away
Implementation Method 4
In contrast to the pump shaft, the motor shaft is ball-bearing mounted, which results in minimal play.
Data Source
AI summary
An adapter for connecting an electric motor unit and a hydraulic pump unit, including: an adapter housing having a motor-side end face and a pump-side end face, wherein the motor-side end face and the pump-side end face each run perpendicular to an axis of rotation; a recess, running along the axis of rotation and provided in the adapter housing, for receiving a coupling unit, wherein a motor shaft of the motor unit and a pump shaft of the pump unit can be coupled to transmit torque; a seal receptacle provided in the recess in the region of the motor-side end face; a motor shaft seal, arranged on or in the seal receptacle, configured for arrangement on the motor shaft and for sealing the recess in the direction of the motor-side end face; and first and second fluid channels configured such that the recess fluidically connects the first fluid channel and the second fluid channel.