Steer axle high-temperature warning system

1. A high temperature warning system for a steer-axle wheel end assembly, the system comprising:

a pressurized fluid supply,

a solid 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 a channel along the central axis of the steer-axle spindle, the channel extending from the inner face to the outer end and in sealed fluid communication with the pressurized fluid supply at the inner face,

a normally-closed valve disposed in the channel at the outer end of the steer-axle spindle in, the normally-closed valve and steer-axle spindle forming a sealing interface so as to prevent fluid from flowing from the channel through the outer end of the steer-axle spindle,

a heat sensitive control capable of opening the normally-closed valve upon a predetermined temperature, the heat sensitive control mounted on or near the steer-axle wheel end assembly in a heat exchange relationship therewith, and

a warning indicator connected to the pressurized fluid supply for actuation upon opening of the normally-closed valve.

2. The system of claim 1 wherein the heat sensitive control forms part of the normally-closed valve.

3. The system of claim 1 wherein the heat sensitive control comprises a eutectic alloy capable of melting and opening the normally-closed valve upon reaching the predetermined temperature.

4. A high temperature warning system for a steer-axle wheel end assembly, the steer-axle wheel end assembly comprising a solid steer-axle pivotably mounted to a steer axle the steer-axle spindle having an inner face facing the steer axle and having an outer end, the system comprising:

a pressurized fluid supply;

a valve block mounted to the inner face of the spindle in a heat exchange relationship therewith,

a normally-closed valve mounted to the valve block, and the pressurized fluid supply sealingly connected to the valve block in fluid communication with the normally-closed valve,

a heat sensitive control capable of opening the normally-closed valve upon a predetermined temperature, the heat sensitive control mounted on or near the steer-axle wheel end assembly in a heat exchange relationship therewith, wherein the heat sensitive control comprises a eutectic alloy capable of melting and opening the normally-closed valve upon reaching the predetermined temperature, and

a warning indicator connected to the pressurized fluid supply for actuation upon opening of the normally-closed valve.

5. The system of claim 3 , the steer-axle wheel end assembly comprising a spindle having a first channel formed therein extending approximately along the central axis of the spindle about which a wheel may rotate, and a second channel formed therein extending approximately radially from the first channel to an external surface of the spindle, and the normally-closed valve is sealingly mounted in the second channel at the external surface of the spindle and the air pressure supply is in sealed fluid communication with the normally-closed valve through the first channel and second channel.

6. The system of claim 1 , wherein the warning indicator comprises a flow switch capable of sensing air flow from the air pressure supply, and a warning light capable of activation by the flow switch.

7. The system of claim 3 , wherein the warning indicator comprises a channel formed in the normally-closed valve through which air may flow and produce sound audible to humans when the normally-closed valve opens.

8. An automatic tire inflation and high-temperature warning system for a steer-axle wheel end assembly comprising a solid 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 a channel extending from the inner face to the outer end along the central axis of the steer-axle spindle, bearings mounted to the spindle, a hub rotatably mounted to the bearings, a wheel mounted to the hub, and a pneumatic tire mounted to the wheel, the system comprising:

a pressurized fluid supply sealingly connected to the channel at the inner face of the steer-axle spindle,

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

a normally-closed valve in sealed fluid communication with the air pressure supply, the normally-closed valve disposed in the spindle in fluid communication with the channel, the normally-closed valve and steer-axle spindle forming a sealing interface so as to prevent fluid from flowing from the channel around the normally-closed valve,

a heat sensitive control capable of opening the normally-closed valve upon a predetermined temperature, the heat sensitive control mounted on or near the steer-axle wheel end assembly in a heat exchange relationship therewith, and

a warning indicator connected to the pressurized fluid supply for actuation upon opening of the normally-closed valve.

9. An automatic tire inflation and high-temperature warning system for a steer-axle wheel end assembly comprising a solid 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 a channel extending from the inner face to the outer end along the central axis of the steer-axle spindle, bearings mounted to the spindle, a hub rotatably mounted to the bearings, a wheel mounted to the hub, and a pneumatic tire mounted to the wheel, the system comprising:

a pressurized fluid supply sealingly connected to the channel at the inner face of the steer-axle spindle,

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

a valve block sealingly mounted to the inner face of the spindle in a heat exchange relationship therewith and in fluid communication with the channel,

a normally-closed valve mounted to the valve block, and the air pressure supply sealingly connected to the valve block in fluid communication with the normally-closed valve and channel,

a heat sensitive control capable of opening the normally-closed valve upon a predetermined temperature, the heat sensitive control mounted on or near the steer-axle wheel end assembly in a heat exchange relationship therewith, and

a warning indicator connected to the pressurized fluid supply for actuation upon opening of the normally-closed valve.

10. A steer-axle wheel end assembly having a high temperature warning system, the assembly comprising:

a solid 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 a channel along the central axis of the steer-axle spindle, the channel extending from the inner face to the outer end so as to allow fluid to communicate with the channel from an air pressure supply in fluid communication with the channel at the inner face of the steer-axle spindle,

a normally-closed valve disposed on the spindle in fluid communication with the channel, the normally-closed valve and steer-axle spindle forming a sealing interface so as to prevent fluid from flowing from the channel around the normally-closed valve,

the normally-closed valve comprising a heat sensitive control, in a heat exchange relationship with the steer-axle spindle, and capable of opening the normally-closed valve upon a predetermined temperature, and

wherein the normally-closed valve is capable of activating a warning indicator connected to the air pressure supply upon opening of the normally-closed valve.

11. A high temperature warning system for a steer-axle wheel end assembly, the system comprising:

pressurized fluid supply,

a solid 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 a channel along the central axis of the steer-axle spindle, the channel extending from the inner face to the outer end so as to allow fluid to communicate with the channel from the pressurized fluid supply in fluid communication with the channel at the inner face of the steer-axle spindle,

a electrically-operated normally-closed valve disposed in the channel at the outer end of the steer-axle spindle, the normally-closed valve and steer-axle spindle forming a sealing interface so as to prevent fluid from flowing from the channel through the outer end of the steer-axle spindle,

a thermal electric switch capable of opening the normally-closed valve upon a predetermined temperature, the thermal electric switch mounted on or near the steer-axle wheel end assembly in a heat exchange relationship therewith, and

a warning indicator connected to the air pressure supply for actuation upon opening of the electrically-operated normally-closed valve.