Fluid couplings

A fluid coupling in combination with a hydraulic brake hose of a selected outside diameter used in a vehicle for coupling the brake hose to a metal tube, wherein the brake hose a deformable polyethylene, polypropylene, polyamid or polytetrafluoroethylene alloy inner layer, a braided reinforcement layer over the polytetrafluoroethylene inner layer and an outer layer of clear deformable resilient material over the braided reinforcement layer, comprising:

• an eyelet having first and second portions;
• the first portion having a stepped bore adapted to receive the metal tube and the second portion having a projecting nipple adapted to be received in the hose, the eyelet further having an annular exterior groove therein;
• a crimping cup having first and second ends, the crimping cup being disposed around the projecting nipple and initially having an inside diameter greater than the outside diameter of the hose, the crimping cup further having an inwardly projecting lip aligned with the exterior groove in the eyelet and a bell-shaped pocket disposed adjacent to an end portion of the hose which has been stripped of the outer layer, and
• a coaxial strain relief configured as an annular ring made of thermoplastic polyamide and having a contoured exterior surface with a bulge element disposed in the bell-shaped pocket and being urged against the braided reinforcement layer when the crimping cup is deformed radially inwardly to press the polytetrafluoroethylene inner layer of the hose against the nipple and the inwardly projecting lip into the exterior groove in the eyelet.

A fluid coupling for coupling a hydraulic hose of a selected outside diameter to a device, wherein the hose includes a deformable resilient inner layer;

• a metal wire reinforcement layer over the inner layer, and a deformable resilient outer layer over the metal wire reinforcement layer, the fluid coupling comprising:
• an eyelet having first and second portions;
• the first portion having a bore adapted to communicate with the device and the second portion having a projecting nipple adapted for receipt in the hose, the eyelet further having an annular exterior groove therein;
• a crimping cup having first and second ends, the crimping cup being disposed around the projecting nipple and initially having an inside diameter greater than the outside diameter of the hose, the crimping cup further having an inwardly projecting lip aligned with the annular exterior groove in the eyelet and a bell-shaped pocket adapted to be disposed adjacent to an end portion of the hose which has been stripped of the outer layer, and
• a coaxial strain relief element configured as an annular ring and having a contoured exterior surface with a bulge disposed in the bell-shaped pocket for being urged against the end portion of the hose which has been stripped of the outer layer and against the outer layer when the crimping cup is deformed radially inwardly to press the inner layer of the hose against the nipple and to press the inwardly projecting lip into the exterior groove in the eyelet.