Hydraulic Motor Assembly Internal Case Drain
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Solution Overview
Problem
Hydraulic motor assemblies in vehicles and equipment face challenges in efficiently managing fluid losses and contamination, particularly when the motor is distant from the pump, leading to wear and the need for additional structural components like case drain ports.
Innovation Solution
The integration of an internal case drain and a speed sensor within the hydraulic motor assembly allows for direct control of the hydraulic pump via an electronic controller, reducing the need for external case drain ports and minimizing contamination by separating the gear and motor chambers with a pressure seal, and using a speed sensor to regulate motor output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an external case drain port and additional hydraulic line are used to remove fluid losses, then fluid losses can be effectively managed, but the device complexity and structural requirements increase
Solution Approach 1:
The patent merges the case drain function with the motor housing by integrating a case drain gallery directly into the housing structure. This eliminates the need for separate external case drain ports and associated hydraulic lines, thereby reducing device complexity while maintaining effective fluid loss management through the integrated drainage pathway.
Solution Approach 2:
The motor housing itself provides the case drain functionality through the integrated case drain gallery, allowing the structure to serve its own drainage needs without requiring additional external components. The housing acts as both the containment structure and the drainage system, eliminating dependency on separate structural elements.
2Adaptability or versatility
If the hydraulic motor is placed distant from the pump, then adaptability to different equipment configurations is improved, but fluid losses and contamination increase due to longer fluid paths
Solution Approach 1:
The gear chamber and motor chamber are merged into a single integrated housing with a common sump, eliminating the need for separate chambers and inter-chamber fluid pathways. This integration reduces fluid loss and contamination risk by removing intermediate connection points while allowing the motor to be positioned at various distances from the pump, enhancing equipment configuration adaptability.
3Reliability
If additional structural components like case drain ports are added, then fluid loss management is improved, but manufacturing complexity and assembly requirements increase
Solution Approach 1:
The case drain gallery is integrated directly into the motor housing as a built-in feature rather than being a separate component. This merging of functions allows the housing to be manufactured as a single piece or pre-assembled unit with the drainage pathway already incorporated, significantly simplifying both manufacturing processes and final assembly while maintaining effective fluid loss management.
Data Source
AI summary
A hydraulic motor assembly capable of precise control having a housing, a hydraulic mounting surface located in the housing, a cylinder block rotatably disposed on the hydraulic mounting surface, a motor shaft engaged to the cylinder block and supported proximate to a first end, a plurality of cooperating gears located in the housing and rotationally engaged to a second end of the motor shaft, an output shaft rotationally engaged to the plurality of cooperating gears, a speed sensor located proximate to one of the plurality of cooperating gears, wherein the speed sensor transmits a signal indicative of the rotational speed of the one of the plurality of cooperating gears.