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Air Turbine Starter Share Lube System with Oil Supply Positive Shutoff Device

IP.com Disclosure Number: IPCOM000243936D
Publication Date: 2015-Oct-29
Document File: 4 page(s) / 122K

Publishing Venue

The IP.com Prior Art Database

Related People

Ronald Pardini: INVENTOR

Abstract

Propulsion engines utilizing an Air Turbine Starter ATS with a shared lubricant oil system can be vulnerable to oil loss in the case of an ATS malfunction Existing systems are unsuccessful in detecting and preventing the loss of the lubricant oil via the oil supply line leading to the ATS Uncontrolled the loss of lubricant oil may result in the failure of the propulsion engine The solution below discloses the use of a normally open solenoid for preventing loss of lubricant oil in the case of ATS damage

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Air Turbine Starter Share-Lube System with Oil Supply Positive Shutoff Device

Ronald Pardini

ABSTRACT

Propulsion engines utilizing an Air Turbine Starter (ATS) with a shared lubricant oil system can be vulnerable to oil loss in the case of an ATS malfunction. Existing systems are unsuccessful in detecting and preventing the loss of the lubricant oil via the oil supply line leading to the ATS. Uncontrolled, the loss of lubricant oil may result in the failure of the propulsion engine. The solution below discloses the use of a normally- open solenoid for preventing loss of lubricant oil in the case of ATS damage.


1. INTRODUCTION

The ATS is typically used to accelerate the propulsion engine to a desired speed before ignition of engine combustor. Pressurized air fed into the ATS drives the rotation of an ATS rotor, which in turn starts the rotation of the starter shaft. The starter shaft transmits this rotation to the drive shaft of the gearbox. Rotation of the gearbox shaft drives rotation of a rotor within the propulsion engine which induces airflow into the engine and causes rotation of the engine rotor assembly. When the engine rotation reaches a desired speed, the ATS is turned off by stopping the pressurized air flow.

As the ATS is driven only during the start up of the propulsion engine, a shared lubrication system is used between the propulsion engine and the ATS. The ATS is commonly mounted to a propulsion engine using the gearbox. An Assisted wet cavity design is used to ensure that the ATS receives sufficient lubricant oil from the propulsion engine.

In instances where the ATS is damaged in such a manner that the ATS develops an oil leak the lubricant oil from the propulsion engine continues to be pumped into the damaged ATS, resulting in shortage of the lubricant oil in the propulsion engine. The

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primary point of oil transmission is from the oil supply line that feeds oil from the propulsion engine to the ATS. A high loss of lubricant oil in the propulsion engine may result in failure of the propulsion engine.

A current solution, to minimize the loss of lubricant oil, is the use of fixed area flow restrictors. The fixed area restrictors limit the amount of oil transfer, but are unsuccessful in preventing the loss of the lubricant oil should there be a breach in the ATS.

Another solution, to prevent the loss of lubricant oil, uses the difference in pressure between the ATS and the gearbox of the propulsion engine to detect loss of lubricant oil from the propulsion engine. However, low pressure differences between the ATS and the gearbox of the propulsion engine may not be measured and lubricant oil continues to leak from the propulsion engine.

Therefore in the event of ATS damage, there is currently no means to interrupt the flow of lubricant oil to the ATS resulting in a high oil loss rate from the propulsion engine. Hence, there is a need for a simple system and method to prevent loss of lubricant oil.


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