Polymer seal assembly
A seal assembly includes a seal body, a spring disposed adjacent to the seal body, and a seal ring disposed adjacent to the seal body. The seal body and the seal ring can include a plastic polymer material. The seal assembly can be a subcomponent of hydraulic strut in the landing gear of an aircraft.
1. A seal assembly comprising:
a seal body comprising a first material, the seal body comprising at least one seal groove extending radially along a first major surface of the seal body;
a spring disposed adjacent to the seal body and adapted to bias a radial portion of the seal body; and
a seal ring, the seal ring being generally rectangular in a cross-section substantially orthogonal to a central axis of the seal ring, the seal ring comprising a second material, the seal ring comprising at least one seal ring groove extending radially along a first major surface of the seal ring and includes at least two repeating seal grooves having opposing asymmetric sidewalls that extend into a thickness of the seal ring,
wherein each of the first material and the second material comprises a plastic polymer material having a Young's modulus of at least 150 MPa, wherein the seal body comprises a contact surface having a substantially flat surface adapted to contact the seal ring, wherein the seal ring has a radial height RH2 that is substantially the same as a radial height RH1 of the seal body, and wherein a Shore D Hardness value of the second material is less than a Shore D Hardness value of the first material by at least 1.
2. The seal assembly of claim 1 , wherein the seal ring comprises a contact surface that faces, abuts, or directly contacts the contact surface of the seal body.
3. The seal assembly of claim 1 , wherein the first material comprises a nylon, a fluoroplastic, a polybenzimidazole (PBI), a polyether ether ketone (PEEK), a polyaryletherketone (PAEK), a polyimide (PI), or any combination thereof.
4. The seal assembly of claim 1 , wherein the first material comprises a polyetherimide (PEI).
5. The seal assembly of claim 1 , wherein the first material comprises a liquid crystal polymer.
6. The seal assembly of claim 1 , wherein the first material comprises a fluoroplastic.
7. The seal assembly of claim 2 , wherein the contact surface of the seal ring has substantially the same dimensions as the contact surface of the seal body.
8. The seal assembly of claim 1 , wherein the first material and the second material are the same.
9. The seal assembly of claim 1 , wherein the first material and the second material are different.
10. The seal assembly of claim 1 , wherein the first material is free of an elastomer, the second material is free of an elastomer, or both the first material and the second material are free of an elastomer.
11. The seal assembly of claim 1 , wherein the first major surface of the seal body includes at least two repeating seal grooves having opposing asymmetric sidewalls that extend into a thickness of the seal body.
12. The seal assembly of claim 1 , wherein the contact surface of the seal body is substantially substantially orthogonal to a central axis of the seal body.
13. The seal assembly of claim 1 , wherein the seal assembly is adapted to provide a dynamic seal between a housing and a shaft, the dynamic seal having a leakage rate of no greater than 0.05 mL.
14. The seal assembly of claim 1 , wherein the seal body includes a first portion having a generally rectangular cross-section and a second portion having a generally U-shaped cross-section.