Method and apparatus for providing a retractable multi-truck inline landing gear for heavy aircraft
阅读：458发布：2024-01-28
专利汇可以提供Method and apparatus for providing a retractable multi-truck inline landing gear for heavy aircraft专利检索，专利查询，专利分析的服务。并且A retractable, main landing gear for aircraft weighing over a half million pounds comprises four trucks for four oleo struts or three trucks for three oleo struts, all trucks being on a transverse line, both when extended for loading up each oleo strut equally from the instant of touchdown, and when retracted for being positioned contiguous with each other for requiring the least amount of wheel well space. Further, all struts are mounted on trunnions secured to the rear and mid wing spars for providing a minimum of landing gear structural weight.，下面是Method and apparatus for providing a retractable multi-truck inline landing gear for heavy aircraft专利的具体信息内容。
1. A retractable multi-wheel truck main landing gear for an aircraft having a wing and fuselage comprising: a fore and an aft wing spar; a first bearing mounted internally of the aft wing spar; a second bearing mounted to the fore wing spar; a trunnion inserted internally through the aft wing spar and mounted such that the front portion of the trunnion is pivotally mounted in the second bearing supported on the fore spar, the mid portion of the trunnion is pivotally mounted in the first bearing in the aft spar, and the aft portion of the trunnion is cantilevered rearwardly off from the aft spar; a landing gear oleo strut mounted to the cantilevered aft portion of the trunnion for rotation about the trunnion axis during extension and retraction of the landing gear; a fuselage wheel well compartment; and said cantilevered trunnion rotational axis being positioned with respect to the aft wing spar so as to permit rotation of the main landing gear oleo and the multi-wheel truck attached thereto, from an extended position for landing, to a retracted position wherein the main landing gear multi-wheel truck is stowed in the fuselage wheel well compartment.
2. A landing gear as recited in claim 1 wherein said first bearing comprises: an outer and an inner race, the outer race being circumferentially split and fixedly connected internally to the aft wing spar, the inner race being fixedly connected to the midportion of the trunnion and said outer race encapsulating the inner race for rotatably mounting the midportion of the trunnion for reacting landing loads through the aft spar.
3. A landing gear as recited in claim 1 wherein the longitudinal length of said fuselage wheel well compartment is defined by an aft spar fuselage center section forming the forward limit of said compartment and a body bulkhead rearward of the aft spar fuselage center section for forming the aft limit of the wheel well compartment.
4. A landing gear as recited in claim 1 wherein the trunnion midportion, which is supported by said encapsulating first bearing, has an integral continuous web structure in the cross-section plane through the encapsulating first bearing for carrying the aft spar shear web loads continuous through the trunnion cross-section.
5. A landing gear as recited in claim 1 further comprising: a folding side brace linkage means having one end pivotally mounted to body structure and the other end being pivotally attached to the outer sleeve of the landing gear oleo strut for retracting the multi-wheel truck main landing gear into the opening in the underside of the fuselage.
6. A retractable three post multi-wheel truck main landing gear for an aircraft having a wing and fuselage comprising: a fore and an aft wing spar; a first bearing mounted internally of the aft wing spar; a second bearing mounted to the fore wing spar; a trunnion inserted internally through the aft wing spar and mounted such that the front portion of the trunnion is pivotally mounted in the second bearing supported on the fore spar, the midportion of the trunnion is pivotally mounted in the first bearing in the aft spar, and the aft portion of the trunnion is cantilevered rearwardly off from the aft spar; a landing gear oleo strut mounted to the cantilevered aft portion of the trunnion for rotation about the trunnion axis during extension and retraction of the landing gear; a fuselage wheel well compartment wherein the longitudinal length of said compartment is defined by an aft spar fuselage center section, a body bulkhead rearward of the aft spar fuselage center section forming the aft limit of the wheel well compartment; and said cantilevered trunnion rotational axis being skew positioned with respect to the aft wing spar so as to permit rotation of the main landing gear oleo and the multi-wheel truck attached thereto from an extended position for landing wherein the main landing gear multi-wheel trucks are in an inline transverse position such that upon landing of the aircraft in a laterally level attitude, all of the landing impact forces are simultaneously equally absorbed by the three post main landing gear for all angles of pitch attitude of the aircraft above the horizon, to a retracted position wherein all of the main landing gear multi-wheel trucks are stowed in the fuselage wheel well compartment so as to be juxtapositioned behind the aft spar fuselage center section for landing gear stowage independent of the sweep angle position of the aft wing spar.
7. A landing gear as recited in claim 6 wherein said first bearing comprises: an outer and an inner race, the outer race being circumferentially split and fixedly connected internally to the aft wing spar, the inner race being fixedly connected to the midportion of the trunnion and said outer race encapsulating the inner race for rotatably mounting the midportion of the trunnion for reacting landing loads through the aft spar.
8. A landing gear as recited in claim 6 wherein the trunnion midportion, which is supported by said encapsulating first bearing, has an integral continuous web structure in the cross-section plane through the encapsulating first bearing for carrying the aft spar shear web loads continuous through the trunnion cross-section.
9. A retractable four post four-wheel truck main landing gear for an aircraft having a wing and fuselage comprising: a fore and an aft wing spar; a trunnion inserted internally through the aft wing spar; a first bearing having an outer and an inner race, the outer race being circumferentially split and fixedly connected internally to the aft wing spar, the inner race being fixedly connected to the midportion of the trunnion and said outer race encapsulating the inner race for rotatably mounting the midportion of the trunnion for reacting landing loads through the aft spar; a second Bearing mounted to the fore wing spar for rotatably mounting the front end of the trunnion; said trunnion being mounted to the fore and aft wing spar such that the front end of the trunnion is pivotally mounted in the second bearing supported on the fore spar, the midportion of the trunnion is pivotally mounted in the first encapsulating bearing in the aft spar for reacting landing loads through the spar, and the aft end of the trunnion is cantilevered rearwardly off from the aft spar; a landing gear oleo strut pivotally connected to the cantilevered end of the trunnion for rotation about the trunnion axis during extension and retraction of the landing gear; a fuselage wheel well compartment wherein the longitudinal length of said compartment is defined by an aft spar fuselage center section forming the forward limit of said compartment and a body bulkhead rearward of the aft spar fuselage center section forming the aft limit of the wheel well compartment; and said cantilevered trunnion rotational axis being skew positioned with respect to the aft wing spar so as to permit rotation of the main landing gear oleo and the four-wheel truck attached thereto from an extended position for landing wherein the four post four-wheel truck main landing gear is in an inline transverse position such that upon landing of the aircraft in a laterally level attitude, all of the landing impact forces are simultaneously equally absorbed by the four post main landing gear for all angles of pitch attitude of the aircraft above the horizon, to a retracted position wherein all of the main landing gear four-wheel trucks are stowed in the fuselage wheel well compartment so as to be juxtapositioned behind the aft spar fuselage center section for landing gear stowage independent of the sweep angle position of the aft wing spar.
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