Steer axle tire inflation system

• US 10,668,777 B2
• Filed: 09/14/2017
• Issued: 06/02/2020
• Est. Priority Date: 07/29/2010
• Status: Active Grant

• Current Assignee: Pressure Systems International LLC
• Original Assignee: Equalaire Systems Incorporated
• Inventors: Musgrave, Tim, Hennig, Mark Kevin
• Primary Examiner(s): Morano, S. Joseph
• Assistant Examiner(s): Charleston, Jean W
• Application Number:
  US15/705,056
• Publication Number:
  US 20180222258A1
• Time in Patent Office: 992 Days
• Field of Search: 152416, 152417, 152418
• CPC Class Codes: B60B 2900/731 Use in cases of damage, failure or emergency
• CPC Class Codes: B60B 35/003 Steerable axles
• CPC Class Codes: B60C 23/002 by monitoring conditions other than tyre pressure or deformation
• CPC Class Codes: B60C 23/00336 on the axles
• CPC Class Codes: B60C 23/00354 Details of valves
• CPC Class Codes: B60C 23/00363 Details of sealings
• CPC Class Codes: B60C 23/00381 specially adapted for steerable wheels
• CPC Class Codes: B60C 23/20 Devices for measuring or signalling tyre temperature only
• CPC Class Codes: B60C 29/06 Accessories for tyre-inflating valves, e.g. housings, guards, covers for valve caps, locks, not otherwise provided for B60C23/0496 takes precedence; tools for screwing and unscrewing valve caps B25B27/0057; pump connectors F04B33/005
• CPC Class Codes: B60T 17/22 Devices for monitoring or checking brake systems; Signal devices
• CPC Class Codes: B60T 5/00 Vehicle modifications to facilitate cooling of brakes
• CPC Class Codes: F16K 17/383 the valve comprising fusible, softening or meltable elements, e.g. used as link, blocking element, seal, closure plug F16K17/386 takes precedence
• CPC Class Codes: Y10T 137/1797 Heat destructible or fusible
• CPC Class Codes: Y10T 137/8158 With indicator, register, recorder, alarm or inspection means
• CPC Class Codes: Y10T 137/8326 Fluid pressure responsive indicator, recorder or alarm

Abstract

A steer axle spindle may have one or more channels formed therein. A rotary union may be mounted to a steer axle wheel end assembly. The rotary union may be sealingly connected to a pressurized fluid source through the channel, and sealingly connected to a vehicle tire.

Claims

1. A tire inflation system for a steer-axle wheel end assembly having a steer-axle spindle and a tire, the system comprising:

a pressurized fluid supply;

the steer-axle spindle pivotably mounted to a steer axle, the steer-axle spindle having an inner face facing the steer axle and having an outer end, the steer-axle spindle forming an axial channel along the central axis of the steer-axle spindle, the axial channel extending from the outer end and being in sealed fluid communication with the pressurized fluid supply; and

a rotary union sealingly mounted to the axial channel at the outer end of the steer-axle spindle, the rotary union being in sealed fluid communication with the pressurized fluid supply and with the tire, the rotary union comprising;

a rotary body being configured to mount to the exterior or interior of a hubcap, or comprising part of a hubcap;

a stator disposed in the axial channel at the outer end of the steer-axle spindle;

a first seal circumferentially disposed in the stator, the first seal being an annular seal;

a second seal disposed in the rotary body; and

a tubular member sealingly disposed between the first annular seal and the second seal, wherein the tubular member comprises a rigid portion and a flexible portion.

2. The system of claim 1, further comprising a filter disposed at an end of the stator.

3. The system of claim 1, further comprising a filter disposed in the stator.

4. The system of claim 1, further comprising a fluid filter disposed between the pressurized fluid supply and the rotary union.

5. The system of claim 1, the axial channel extending from the outer end to the inner face.

6. The system of claim 5, further comprising tubing providing sealed fluid communication to the axial channel at the inner face of the steer axle spindle.

7. The system of claim 6, further comprising a fitting connecting the tubing to the inner face, the fitting comprising a fluid filter.

8. The system of claim 1, the spindle further forming a radial channel, the radial channel extending radially from the axial channel through the spindle and being in sealed fluid communication with the pressurized fluid supply so as to allow fluid to flow from the radial channel to the axial channel.

9. The system of claim 1, further comprising a fluid hose providing sealed fluid communication between the rotary union and the tire.

10. The system of claim 1, further comprising a breakaway tire valve mounted to a wheel of a steer-axle wheel end assembly, the breakaway tire valve being in fluid communication with the tire;

and a fluid hose providing sealed fluid communication between the rotary union and the breakaway tire valve.

11. The system of claim 1, further comprising tubing providing sealed fluid communication between the stator and the pressurized fluid supply through the axial channel.

12. A tire inflation system for a steer-axle wheel end assembly having a steer-axle spindle and a tire, the system comprising:

a pressurized fluid supply;

the steer-axle spindle pivotably mounted to a steer axle, the steer-axle spindle having an inner face facing the steer axle and having an outer end, the steer-axle spindle forming an axial channel along the central axis of the steer-axle spindle, the axial channel extending from the outer end and being in sealed fluid communication with the pressurized fluid supply; and

a rotary union sealingly mounted to the axial channel at the outer end of the steer-axle spindle, the rotary union being in sealed fluid communication with the pressurized fluid supply and with the tire, the rotary union comprising;

a rotary body being configured to mount to the exterior or interior of a hubcap, or comprising part of a hubcap;

a stator disposed in the axial channel at the outer end of the steer-axle spindle;

a first seal circumferentially disposed in the stator, the first seal being an annular seal;

a second seal disposed in the rotary body, wherein the second seal is an annular seal circumferentially disposed in the rotary body, and; and

a tubular member sealingly disposed between the first annular seal and the second seal, wherein the tubular member is rotatably, pivotably and translatably disposed in the first seal and rotatably and pivotably disposed in the second seal.

13. The system of claim 12, wherein the first seal is an elastomeric o-ring or a lip seal, and the second seal is an elastomeric o-ring or a lip seal.

14. A tire inflation system for a steer-axle wheel end assembly having a steer-axle spindle and a tire, the system comprising:

a pressurized fluid supply;

the steer-axle spindle pivotably mounted to a steer axle, the steer-axle spindle having an inner face facing the steer axle and having an outer end, the steer-axle spindle forming an axial channel along the central axis of the steer-axle spindle, the axial channel extending from the outer end and being in sealed fluid communication with the pressurized fluid supply; and

a rotary union sealingly mounted to the axial channel at the outer end of the steer-axle spindle, the rotary union being in sealed fluid communication with the pressurized fluid supply and with the tire, the rotary union comprising;

a rotary body being configured to mount to the exterior or interior of a hubcap, or comprising part of a hubcap;

a stator disposed in the axial channel at the outer end of the steer-axle spindle;

a first seal circumferentially disposed in the stator, the first seal being an annular seal;

a second seal disposed in the rotary body; and

a tubular member sealingly disposed between the first annular seal and the second seal, the tubular member being non-rotating with respect to the steer axle spindle, the tubular member comprising a steel portion, the second seal comprising a face seal formed of the steel portion and an abutting rotatable graphite portion.