): Oil churning, splashing, and windage losses caused by components rotating through the lubricant and air mix. 2. Calculation of Heat Dissipation
ISO/TR 14179-2 is a technical report published by the International Organization for Standardization (ISO). It provides specific analytical formulas to calculate the thermal load capacity of gear units.
No. As a Technical Report (TR), this document provides guidance rather than normative requirements. However, many industries and regulatory frameworks reference it as the de facto standard for gear thermal capacity assessment.
The document is essential for applications where the mechanical capacity exceeds the thermal capacity—a common scenario in high-speed or heavily loaded industrial gearboxes.
Imagine a lead engineer, Sarah, at a renewable energy firm. Her team just finished a prototype for a new high-speed industrial turbine. On paper, the gears are strong enough to handle the torque. But during the first full-load test, the oil sump temperature iso tr 14179-2 pdf
Predict power losses within the system to improve energy efficiency.
Part 2 provides empirical formulas for (churning, windage, seal drag). These losses depend on:
Unexpected structural failures halt production lines. Core Contents of the ISO/TR 14179-2 Document
| Parameter | Description | Why it matters | | :--- | :--- | :--- | | | Temperature around gearbox | Lower ambient = more thermal capacity | | Altitude | Above sea level | Reduced air density reduces cooling | | Type of lubrication | Splash, forced, or oil-mist | Affects churning losses | | Housing design | Cast iron vs. aluminum | Aluminum dissipates heat better | | Service factor | Duty cycle (continuous vs. intermittent) | Intermittent duty allows peak overload | ): Oil churning, splashing, and windage losses caused
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: Specifically for splash-lubricated gear units, it provides methods to determine the quasi-stationary temperature in the oil sump. Key Components of Thermal Balance
If you obtain the , you will find detailed methodologies for calculating the thermal limit. Here is a breakdown of the major sections:
During the gearbox design phase, ISO/TR 14179-2 allows engineers to calculate thermal limits before a single prototype is built. By iteratively solving the thermal equilibrium between heat generated and heat dissipated, designers can optimize housing geometry, select appropriate cooling methods, and avoid costly redesigns. It provides specific analytical formulas to calculate the
AGMA guidelines recommend the maximum oil sump temperature should not exceed 200°F (approximately 94°C), aligning closely with ISO specifications.
) generated inside a gearbox is calculated as the sum of individual component losses. These are broken down into (which change based on torque) and no-load losses (which occur simply because the parts are moving through fluids). Load-Dependent Gear Power Losses ( PVZPcap P sub cap V cap Z cap P end-sub
ISO/TR 14179-2 is a standards publication; obtain the official PDF via authorized distributors (ISO or national standards bodies) or your organization's standards subscription. I cannot provide or link to pirated copies.