Hydraulic Motor Casing Cooling via Throttle Passage
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Solution Overview
Problem
Existing hydraulic motors suffer from insufficient cooling of the casing, particularly under varying operating conditions, due to limited flow of leak oil or reduced hydraulic oil pressure, which can lead to overheating of the reduction gear and casing.
Innovation Solution
The design incorporates a throttle passage that directs hydraulic oil from the brake release pressure passage to the casing chamber, where it circulates to absorb heat, and a low-pressure selective valve to manage oil flow, ensuring adequate cooling regardless of operating conditions by adjusting the flow amount based on the motor's operational state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If leak oil is used to cool the casing, then the casing is cooled, but the flow amount is small and cooling may be insufficient
Solution Approach 1:
The hydraulic oil serving the capacity-varying mechanism is made to serve dual purposes: both controlling the motor capacity and cooling the casing. The oil that would otherwise only control the tilting actuator now also flows through the casing chamber to provide cooling, eliminating the need for separate cooling oil supply.
Solution Approach 2:
The cooling oil supply passage is merged with the capacity control system. The hydraulic oil that controls the tilting actuator is combined with the cooling function by directing it to flow into the casing chamber through the supplied oil passage, consolidating two functions into one oil flow path.
2Speed
If hydraulic oil pressure is switched to low by speed switching valve, then traveling speed is controlled, but the flow amount of hydraulic oil to casing is reduced and cooling becomes insufficient
Solution Approach 1:
The low-pressure selective valve acts as an intermediary device that ensures adequate cooling oil flow regardless of the main hydraulic pressure level. It selectively supplies oil to the casing chamber from appropriate sources, maintaining cooling effectiveness even when the main system operates at low pressure for speed control.
Solution Approach 2:
The system changes the pressure parameter of the cooling oil by using the low-pressure selective valve to select appropriate oil sources. When main hydraulic pressure is low, the valve redirects oil flow to maintain sufficient cooling, effectively adapting the cooling system to different pressure conditions.
3Power
If hydraulic oil is led to capacity-varying mechanism, then motor capacity is controlled, but cooling of casing is insufficient when pressure is low
Solution Approach 1:
The hydraulic oil supply system is designed to serve multiple functions simultaneously: controlling the capacity-varying mechanism and cooling the casing. The same oil flow that adjusts motor capacity also provides cooling, ensuring both functions are maintained without requiring separate dedicated systems.
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 solution effectively maintains the casing and reduction gear at a lower temperature, preventing overheating and ensuring sufficient cooling during both high-speed operation and idle states, thereby extending the lifespan of components and maintaining performance.
Implementation Method 1
hydraulic liquid that has flowed out from the throttle passage 50 into the casing chamber 58 circulates in the casing chamber 58, and the casing 59 is cooled
Implementation Method 2
hydraulic liquid that has flowed out from the throttle passage 50 into the casing chamber 58 circulates in the casing chamber 58
Data Source
Figure 1
Figure 2
AI summary
A hydraulic motor includes a motor mechanism that rotates by hydraulic liquid pressure led from a hydraulic liquid pressure source. The hydraulic motor includes a casing that defines a casing chamber which accommodates the motor mechanism, a brake mechanism that brakes the rotation of the motor mechanism, a brake release actuator that releases the braking of the brake mechanism by a brake release pressure led from the hydraulic liquid pressure source, and a throttle passage that is in communication with the casing chamber and extracts a portion of hydraulic liquid that is led into the brake release actuator and leads it to the casing chamber.