Quick connector for hydraulic hose coupling

Patent metadata

Field	Value
Publication number	US-9822913-B2
Application number	US-201514659073-A
Country	US
Kind code	B2
Filing date	Mar 16, 2015
Priority date	Mar 16, 2015
Publication date	Nov 21, 2017
Grant date	Nov 21, 2017

Abstract

A hydraulic fluid line coupling system is disclosed. The coupling may include a female fitting, a male fitting, first and second elastomeric seals between the female fitting and male fitting, and a lock nut securing the female fitting to the male fitting, and the lock nut including a plurality of threads.

First claim

What is claimed is:

1. A hydraulic fluid line coupling system, comprising:
a female fitting having a proximal end including a recess configured to circumferentially engage an outer circumference of a first fluid line;
a male fitting received in the female fitting having a hose end including a recess configured to circumferentially engage an outer circumference of a second fluid line; and
a lock nut securing the female fitting to the male fitting, the lock nut having a plurality of threads, wherein female fitting further includes a plurality of threads meshing with the plurality of threads on the lock nut.

2. The hydraulic fluid line coupling system of claim 1 , wherein the plurality of lock nut threads are perpendicular to a longitudinal axis of the lock nut.

3. The hydraulic fluid line coupling system of claim 1 , wherein the plurality of threads on the lock nut and on the female fitting are incomplete.

4. The hydraulic fluid line coupling system of claim 3 , wherein the plurality of threads on the female fitting and lock nut are bifurcated.

5. The hydraulic fluid line coupling system of claim 4 , further including at least one locking pin extending through the female fitting and lock nut.

6. The hydraulic fluid line coupling system of claim 1 , wherein the male fitting includes a radially outwardly directed shoulder.

7. The hydraulic fluid line coupling system of claim 6 , wherein the lock nut includes a radially inwardly directed shoulder engaging the radially outwardly directed shoulder of the male fitting.

8. The hydraulic fluid line coupling system of claim 7 , wherein the female fitting includes a radially inwardly directed shoulder, a distal end of the male fitting engaging the radially inwardly directed shoulder of the female fitting.

9. The hydraulic fluid line coupling system of claim 8 , wherein the distal end of the male fitting is circumferentially tapered.

10. The hydraulic fluid line coupling system of claim 1 , wherein the female fitting includes first and second internal radial grooves receiving first and second elastomeric radial seals.

11. A method of sealing a hydraulic fluid line coupling, comprising:
inserting a male fitting having a hose end including a recess configured to circumferentially engage an outer circumference of a second fluid line into a female fitting having a proximal end including a recess configured to circumferentially engage an outer circumference of a first fluid line;
sealing the male fitting to the female fitting using first and second elastomeric seals; and
securing the female fitting to the male fitting using a lock nut having a plurality of internal threads, and a locking pin longitudinally extending through a circumferential rib of the female fitting and into a body radially extending between an inner surface and an outer surface of the lock nut.

12. The method of claim 11 , further including positioning the first and second elastomeric seals radially between the male and female fittings.

13. The method of claim 11 , further including providing a plurality of external threads on the female fitting, the plurality of external threads on the female fitting meshing with the plurality of internal threads on the lock nut.

14. The method of claim 13 , further including bifurcating the plurality of threads on the female fitting and lock nut so as to have circumferential voids on both.

15. The method of claim 14 , further including orienting the lock nut such that the plurality of internal threads align with the circumferential voids on the female fitting, sliding the lock nut over the female fitting, and rotating the lock nut.

16. The method of claim 15 , further includes stopping rotation of the lock nut prior to a full rotation.

17. A machine, comprising;
a chassis;
an engine mounted on the chassis;
a hydraulic fluid pump powered by the engine;
a hydraulic cylinder in fluid communication with the hydraulic fluid pump;
a plurality of hydraulic fluid tubes connecting the hydraulic fluid pump and the hydraulic cylinder; and
a hydraulic fluid line coupling system connecting the plurality of hydraulic fluid tubes together, the hydraulic fluid line coupling system including a male fitting having a hose end including a recess configured to circumferentially engage an outer circumference of a second fluid line, a female fitting having a proximal end including a recess configured to circumferentially engage an outer circumference of a first fluid line, the female fitting having a first groove and a second groove configured to receive first and second elastomeric seals between the male and female fittings, and a lock nut securing the female fitting to the male fitting, the lock nut having a plurality of internal threads, and a locking pin longitudinally extending through a circumferential rib of the female fitting and into a body radially extending between an inner surface and an outer surface of the lock nut.

18. The machine of claim 17 , wherein the female fitting includes a plurality of external threads meshing with the plurality of internal threads on the lock nut.

19. The machine of claim 17 , wherein the plurality of threads on the female fitting and lock nut are incomplete.

Assignees

• Caterpillar Inc

Inventors

• Considine Jr Patrick E
• Rempert Carl H

Classifications

• F16L2201/20

  Safety or protective couplings · CPC title

• E02F9/2275

  Hoses and supports therefor and protection therefor · CPC title

• F16L37/105 Primary

  the rotating sleeve having on its inner surface several axially spaced and circumferentially discontinuous threads which engage with the threads on the male part which are also spaced axially and circumferentially discontinuous · CPC title