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Low Profile Gimbal

IP.com Disclosure Number: IPCOM000234781D
Publication Date: 2014-Feb-05
Document File: 5 page(s) / 2M

Publishing Venue

The IP.com Prior Art Database

Related People

Shawn Alstad: INVENTOR

Abstract

Gimbals are required to allow relative motion between an exit and an inlet port from two different components that need to be connected. Sometimes gimbals are required to be placed where there is a space constraint and a very tight installation envelope is required. The profile of the gimbal should be low in those locations so that the gimbal is effective without affecting the overall system. The proposed gimbal design has low-profile, minimum outside diameter and maintains at least a seven degree articulation angle in two axes. The proposed design also helps in easy installations in several scenarios such as fan cowl doors, where tighter installations are required.

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Low Profile Gimbal

Shawn Alstad

ABSTRACT

Gimbals are required to allow relative motion between an exit and an inlet port from two different components that need to be connected. Sometimes gimbals are required to be placed where there is a space constraint and a very tight installation envelope is required. The profile of the gimbal should be low in those locations so that the gimbal is effective without affecting the overall system. The proposed gimbal design has low- profile, minimum outside diameter and maintains at least a seven degree articulation angle in two axes. The proposed design also helps in easy installations in several scenarios such as fan cowl doors, where tighter installations are required.


1. Introduction

The purpose of a gimbal is to allow articulation at a certain spring rate while transmitting high temperature/high pressure air or other medium through a ducting system. There are number of situations when compact packing of pipe along with gimbals are required to accommodate high degree of relative motion between pipe and the casing. For instance, the tighter the fan cowl doors are to the engine, the lesser the drag experienced by the aircraft. The space between engines and the fan cowl doors is usually very limited. So there is a need to design low profile, internally choked gimbals to pull in the outside diameters of the gimbals. This was required to ensure that gimbals didn't hit anything during all of the various maneuvers the aircraft would see.

Early stages of airframe and engine design do not take into consideration the gimbal size and ducting motion requirements. Hence, one should somehow fit/ adjust the existing gimbals within all of the other parameters. Also because of the increase in relative motion caused from using a soft mount system and from using engine mounted control valves, the present gimbals must be able to articulate more than they did in a


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traditional hard mounted engine. In summary, the tighter fan cowl door lofting with engine mounted valves results in a decrease in the available space envelope and in an increase in the overall kinematic envelope of the bleed system.

Figure 1: Already Existing Universal Gimbal Joint

As shown in FIG. 1, the already existing gimbal joints have a number of components such as flanges, pins, sliding that make the existing gimbals bulky. In order to reduce the bulkiness the design might have to compromise on inner diameter, making it narrower. Hence, there is a need of a gimbal system that is more compact than the existing gimbals while offering similar flexibility, reliability, and reduced weight.


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2. Solution

The proposed gimbal design offers

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