Hydraulic Motor Casing Cooling via Flushing Passage
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Solution Overview
Problem
Existing hydraulic motors, particularly those with reduction gears, face insufficient cooling due to low flow rates of leak oil or reduced hydraulic oil pressure, leading to overheating issues regardless of operating conditions.
Innovation Solution
A hydraulic motor design that incorporates a flushing passage connected to the casing chamber, allowing hydraulic oil from the low pressure side of the motor passages to flow into the casing chamber, where it absorbs heat, ensuring sufficient cooling regardless of operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If leak oil is used to cool the casing, then cooling function is provided, but the flow amount is insufficient leading to inadequate cooling
Solution Approach 1:
The patent introduces a flushing passage as an intermediary channel that directs hydraulic oil from the low-pressure side to the casing chamber. This mediator passage ensures sufficient cooling fluid flow independent of leak oil quantity, resolving the contradiction between providing cooling function and maintaining adequate flow amount.
2Speed
If hydraulic oil pressure is reduced for low speed operation, then speed control is achieved, but cooling performance deteriorates
Solution Approach 1:
The patent implements a dynamic cooling system where the flushing passage is selectively activated based on operating conditions. The switching valve dynamically directs hydraulic oil to the flushing passage when cooling is needed, ensuring adequate cooling flow regardless of motor speed or hydraulic pressure level.
3Reliability
If a flushing passage is added to improve cooling, then cooling reliability is improved, but device complexity increases
Solution Approach 1:
The flushing passage is merged with the existing hydraulic oil passages and casing structure. The passage utilizes available spaces within the motor housing and integrates with the pressure and return oil passages, thereby improving cooling reliability while minimizing additional structural complexity.
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 design effectively maintains the casing and adjacent reduction gear at a lower temperature, preventing overheating and ensuring reliable operation across various operating conditions.
Implementation Method 1
a flushing passage (47) that is in communication with the casing chamber (58) and extracts a portion of hydraulic liquid from a low pressure side among the first motor passage (41) and the second motor passage (42) and leads it to the casing chamber (58)
Data Source
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AI summary
A hydraulic motor includes a motor mechanism that rotates by hydraulic liquid that is supplied/discharged from a hydraulic liquid pressure source through one of a first motor passage and a second motor passage. The hydraulic motor comprises a casing that defines a casing chamber which accommodates the motor mechanism, and a flushing passage that is in communication with the casing chamber and extracts a portion of the hydraulic liquid from a low pressure side among the first motor passage and the second motor passage and leads it to the casing chamber.