Extreme high-temperature resistant multilayered diesel exhaust fluid tubing

Patent metadata

Field	Value
Publication number	US-11519528-B2
Application number	US-202017082247-A
Country	US
Kind code	B2
Filing date	Oct 28, 2020
Priority date	Oct 28, 2020
Publication date	Dec 6, 2022
Grant date	Dec 6, 2022

Abstract

A tubing to supply diesel exhaust fluid to an exhaust system of a diesel engine includes an inner layer made of a first material and an outer layer made of a second material. The first material includes polyethersulfone polymer or polyphenylene sulfide. The second material includes a polyamide or polyphthalamide. An outer surface of the inner layer and an inner surface of the outer layer include a reactive material that facilitates bonding between the inner layer and the outer layer of the tubing.

First claim

What is claimed is:

1. A tubing to supply diesel exhaust fluid to an exhaust system of a diesel engine, the tubing comprising:
an inner layer made of a first material, wherein the first material includes polyethersulfone polymer or polyphenylene sulfide; and
an outer layer made of a second material, wherein the second material includes a polyamide or polyphthalamide,
wherein an outer surface of the inner layer and an inner surface of the outer layer include an inbuilt chemically reactive substance that facilitates bonding between the inner layer and the outer layer of the tubing.

2. The tubing of claim 1 wherein the reactive material facilitates bonding between the inner layer and the outer layer of the tubing without an adhesive.

3. The tubing of claim 1 further comprising an adhesive layer between the inner layer and the outer layer of the tubing.

4. The tubing of claim 3 wherein the reactive material facilitates bonding between the adhesive layer and the inner and outer layers.

5. The tubing of claim 1 wherein the polyamide includes PA6.10 or PA9T.

6. The tubing of claim 1 wherein:
the tubing is proximate to a component of the exhaust system, wherein heat from the component generates ammonia gas in the tubing from the diesel exhaust fluid; and
the ammonia gas superheats in the tubing when no residual diesel exhaust fluid remains in the tubing.

7. The tubing of claim 1 further comprising:
a first connector connecting a first end of the tubing to a reservoir supplying the diesel exhaust fluid; and
a second connector connecting a second end of the tubing to a component of the exhaust system,
wherein the first and second connectors are made of polyphthalamide or polyphenylene sulfide.

8. A tubing to supply diesel exhaust fluid to an exhaust system of a diesel engine, the tubing comprising:
an inner layer made of a first material, wherein the first material includes polyethersulfone polymer or polyphenylene sulfide; and
an outer layer made of a second material, wherein the second material includes a polyamide or polyphthalamide,
wherein an outer surface of the inner layer and an inner surface of the outer layer include an inbuilt non-adhesive material that facilitates bonding between the inner layer and the outer layer without an adhesive.

9. The tubing of claim 8 further comprising an adhesive layer between the inner layer and the outer layer of the tubing.

10. The tubing of claim 9 wherein an outer surface of the inner layer and an inner surface of the outer layer include a material that facilitates bonding between the adhesive layer and the inner and outer layers.

11. The tubing of claim 8 wherein the polyamide includes PA6.10 or PA9T.

12. The tubing of claim 8 wherein:
the tubing is proximate to a component of the exhaust system, wherein heat from the component generates ammonia gas in the tubing from the diesel exhaust fluid; and
the ammonia gas superheats in the tubing when no residual diesel exhaust fluid remains in the tubing.

13. The tubing of claim 8 further comprising:
a first connector connecting a first end of the tubing to a reservoir supplying the diesel exhaust fluid; and
a second connector connecting a second end of the tubing to a component of the exhaust system,
wherein the first and second connectors are made of polyphthalamide or polyphenylene sulfide.

Assignees

• Gm Global Tech Operations Llc

Inventors

• D'Hondt Dennis M

Classifications

• B32B2307/306

  Resistant to heat · CPC title

• B32B27/34

  comprising polyamides · CPC title

• F16L9/121

  with three layers · CPC title

• F16L9/123

  with four layers · CPC title

• F16L11/125

  non-inflammable or heat-resistant hoses · CPC title