Split pivot fitting for helicopter landing gear
A multi-piece pivot fitting for use on aircraft with skid type landing gear has a forward fitting, and aft fitting, and at least a lower strap. This configuration allows cross tube loads to be transferred to the keel beams of the aircraft, thereby allowing selected longitudinal rocking of the aircraft and preventing the aircraft from going into a resonance state.
1. A split pivot fitting for a helicopter landing gear, comprising:
a first fitting having a first pivot pin configured to be pivotally received by a first floor structure;
a second fitting releasably coupled to the first fitting, the second fitting having a second pivot pin configured to be pivotally received by a second floor structure; and
a lower strap releasably coupled to one of the first fitting and the second fitting, the lower strap configured to matingly receive a lower portion of a cross tube member;
wherein the first fitting and the second fitting are free to rotate about a longitudinal axis through the first pivot pin and a longitudinal axis through the second pivot pin.
2. The split pivot fitting of claim 1 , wherein the second fitting comprises:
clevis arms that receive the first fitting therebetween.
3. The split pivot fitting of claim 1 , wherein the first fitting comprises:
clevis arms that receive the second fitting therebetween.
4. The split pivot fitting of claim 1 , further comprising:
a sleeve assembly coupled to the cross tube member.
5. The split pivot fitting of claim 4 , wherein the sleeve assembly partially surrounds the cross tube member.
6. The split pivot fitting of claim 4 , wherein the sleeve assembly is coupled to the cross tube member with at least adhesive.
7. The split pivot fitting of claim 1 , wherein the first fitting and the second fitting are receivable into each other, so as to allow at least vertical and longitudinal movement in relation to each other during installation and removal of the second fitting from the second floor structure, and during installation and removal of first fitting from the first floor structure.
8. The helicopter landing gear of claim 1 , wherein the first fitting is releasably coupled to the second fitting via a fastening means.
9. A landing gear for a helicopter, comprising:
a forward cross tube member;
an aft cross tube member;
at least two longitudinal skid members coupled to the forward cross tube member and the aft cross tube member; and
a split pivot fitting releasably coupled to at least one of the aft cross tube member and the forward cross tube member at an approximate lateral midpoint, the split pivot fitting comprising:
a forward fitting having a forward pivot pin configured to be pivotally received by a first floor structure;
an aft fitting releasably coupled to the forward fitting, the aft fitting having an aft pivot pin configured to be pivotally received by a second floor structure; and
a lower strap releasably coupled to one of the forward fitting and the aft fitting, the lower strap configured to matingly receive a lower portion of a cross tube member;
wherein the forward fitting and the aft fitting are free to rotate about a longitudinal axis through the forward pivot pin and a longitudinal axis through the aft pivot pin.
10. The landing gear of claim 9 , wherein the first floor structure is a forward cross beam having a bore for pivotally receiving the forward pivot pin.
11. The landing gear of claim 10 , wherein the second floor structure is an aft cross beam having a bore for pivotally receiving the aft pivot pin.
12. The landing gear of claim 11 , wherein the first floor structure and the second floor structure are coupled to a keel beam.
13. The landing gear of claim 12 , wherein the forward cross beam and the aft cross beam are adjacent to each other.
14. The landing gear of claim 9 , wherein the split pivot fitting prevents the helicopter from going into a resonance state.