Shroud wear ring for a work vehicle

Patent metadata

Field	Value
Publication number	US-10174481-B2
Application number	US-201414468461-A
Country	US
Kind code	B2
Filing date	Aug 26, 2014
Priority date	Aug 26, 2014
Publication date	Jan 8, 2019
Grant date	Jan 8, 2019

Abstract

A fan assembly for a work vehicle includes a fan shroud defining an opening and a fan. The fan includes a rotor and one or more blades extending outwardly along a radial direction from the rotor. The fan assembly additionally includes a wear ring attached to the fan shroud and extending inwardly along the radial direction. The wear ring is configured to interact with tips of the blades to increase an efficiency of the fan assembly.

First claim

What is claimed:

1. A fan assembly for a work vehicle defining an axial direction, a radial direction, and a circumferential direction, the fan assembly comprising:
a fan shroud defining an opening extending along the axial direction between an air inlet and an air outlet, the opening defining an inner surface between the air inlet and the air outlet;
a rotor rotatably positioned at least partially in the opening of the fan shroud and extending along the axial direction;
one or more blades attached to the rotor, each blade extending outwardly along the radial direction from a base positioned adjacent to the rotor to a tip; and
a wear ring attached to the fan shroud and positioned adjacent to the inner surface of the opening, the wear ring extending inwardly from the inner surface of the opening along the radial direction, the wear ring formed from a material that is worn by the tip of the one or more blades to increase an efficiency of the fan assembly, wherein the wear ring defines a radially inner end, and wherein the radially inner end of the wear ring is formed from a material that deforms during a deformation of the fan shroud during operation of the fan assembly, said wear ring being molded as a single circular piece to form a continuous circular inner surface.

2. The fan assembly of claim 1 , wherein the wear ring defines a radially inner end, the radially inner end that is worn down by the tips of the blades through repeated contact with the tips of the one or more blades.

3. The fan assembly of claim 2 , wherein the rotor and the blades comprise a fan, the fan defining a diameter, and wherein the radially inner end of the wear ring defines a clearance in the radial direction with the tips of the one or more blades, the clearance being less than two percent of the diameter of the fan.

4. The fan assembly of claim 1 , wherein the wear ring is formed by injection molding.

5. The fan assembly of claim 1 , wherein the wear ring defines a base, and wherein the base defines a U-shaped cross-section attached to the fan shroud.

6. The fan assembly of claim 1 , wherein the wear ring is attached to the fan shroud using a plurality of rivets.

7. The fan assembly of claim 1 , wherein the wear ring is comprised of a thermoplastic polyethylene.

8. The fan assembly of claim 1 , wherein the wear ring is comprised of an ultra-high molecular weight polyethylene.

9. The fan assembly of claim 1 , wherein the wear ring is formed from a material wearing gradually when contacted with the tip of one or more of the blades.

10. The fan assembly of claim 1 , wherein the wear ring defines a width along the axial direction that is greater than a width of the blades along the axial direction, and wherein the wear ring is moveably attached to the fan shroud.

Assignees

• Cnh Ind America Llc
• Cnh Ind America Llc

Inventors

• Best Joseph

Classifications

• F04D29/38

  Blades {(for axial flow compressors F04D29/324)} · CPC title

• F04D29/326

  comprising a rotating shroud · CPC title

• F04D29/642 Primary

  by adjusting the clearances between rotary and stationary parts · CPC title

• F04D29/164

  of an axial flow wheel · CPC title

• E02F9/0866 Primary

  Engine compartment, e.g. heat exchangers, exhaust filters, cooling devices, silencers, mufflers, position of hydraulic pumps in the engine compartment · CPC title