Rotary union assembly for use in air pressure inflation systems for tractor trailer tires
DCFirst Claim
1. A rotary union assembly for use in an automatic tire inflation system for maintaining a desired pressure in a plurality of pneumatic tires mounted on the wheels of a vehicle having a source of pressurized air for fluid communication with the tires and a hub cap at the end of each axle for providing a lubrication compartment for the wheel bearings, said assembly comprising:
- a stationary fitting carried by an end of an axle and defining an open channel extending axially therethrough;
a stationary tubular member defining an upstream end portion and a downstream end portion, said upstream end portion extending axially through said channel in said fitting into the interior of said axle and communicating with the source of pressurized air; and
a housing, attachable to the exterior of a hub cap for rotation with said hub cap, said housing defining at least one air passageway extending therethrough and being rotatably mounted on said downstream end portion of said tubular member such that said tubular member communicates the source of pressurized air with said passageway in said housing, whereby air flow is directed from said source through said stationary tubular member to said rotatable housing.
1 Assignment
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Accused Products
Abstract
A rotary union assembly for use in an automatic tire inflation system for maintaining the desired pressure in the tires on a tractor trailer or other vehicle having pressurized axles. The assembly communicates the valve stems on a pair of adjacent tires with the axle interior through the use of a flexible tube extending between a stationary first fitting threadably engaged in the axle spindle and a rotary housing secured against the outside end surface of the hub cap so as to be positioned exteriorly of the wheel lubrication compartment and rotatable with the hub cap. The first fitting defines an open channel extending axially therethrough and includes an o-ring seal extending about the channel and forming an airtight seal within the fitting about the tube. A stationary shaft member having an air passageway extending axially therethrough carries the downstream end of the flexible tube and projects into the rotatable housing to communicate the axle interior with the housing through the flexible tube and provide a rotatable mounting for the housing on the shaft. The shaft defines a stationary bearing surface on its downstream end. A rotary sealing member having an air passageway extending axially therethrough is mounted within the housing for rotation therewith. The rotary sealing member defines a rotary bearing surface which is urged the stationary bearing surface on the shaft member by a spring member. Opposed channels are provided in the housing proximate the bearing surfaces and hose and valve assemblies communicate the opposed channels with the tire valve stems.
39 Citations
80 Claims
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1. A rotary union assembly for use in an automatic tire inflation system for maintaining a desired pressure in a plurality of pneumatic tires mounted on the wheels of a vehicle having a source of pressurized air for fluid communication with the tires and a hub cap at the end of each axle for providing a lubrication compartment for the wheel bearings, said assembly comprising:
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a stationary fitting carried by an end of an axle and defining an open channel extending axially therethrough; a stationary tubular member defining an upstream end portion and a downstream end portion, said upstream end portion extending axially through said channel in said fitting into the interior of said axle and communicating with the source of pressurized air; and a housing, attachable to the exterior of a hub cap for rotation with said hub cap, said housing defining at least one air passageway extending therethrough and being rotatably mounted on said downstream end portion of said tubular member such that said tubular member communicates the source of pressurized air with said passageway in said housing, whereby air flow is directed from said source through said stationary tubular member to said rotatable housing. - View Dependent Claims (2, 3, 4, 5)
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6. A rotary union assembly for use in an automatic tire inflation system for maintaining a desired pressure in a plurality of pneumatic tires mounted on the wheels of a vehicle having a source of pressurized air for fluid communication with the tires and a hub cap at the end of each axle for providing a lubrication compartment for the wheel bearings, said assembly comprising:
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a first stationary fitting carried by an end of an axle and defining an open channel extending axially therethrough; a tube member defining an upstream end portion and a downstream end portion, said upstream end portion extending axially through said channel in said first fitting into the interior of said axle and communicating with the source of pressurized air; a stationary shaft member having an air passageway extending axially therethrough and communicating with said tubular member; a housing, attachable to the exterior of a hub cap for rotation with said hub cap, said housing defining at least one air passageway extending therethrough and being rotatably mounted on said shaft member such that said air passageways in said shaft member communicates with said air passageway in said housing, whereby air flow is directed from said source through said tube member and said stationary shaft member to said rotatable housing; and an air hose assembly communicating said air passageway in said rotatable housing with at least one of the vehicle tires. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. A rotary union assembly for use in an automatic tire inflation system for maintaining a desired pressure in a plurality of pneumatic tires mounted on the wheels of a vehicle having a source of pressurized air for fluid communication with the tires and a hub cap at the end of each axle for providing a lubrication compartment for the wheel bearings, said assembly comprising:
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a first stationary fitting carried by an end of an axle and defining an open channel extending axially therethrough; a flexible tube member defining an upstream end portion and a downstream end portion, said upstream end portion extending axially through said first fitting, being axially translatable with respect to said fitting and communicating with the interior of said axle; a stationary shaft member having an air passageway extending axially therethrough and communicating with said flexible tube member; a housing, attachable to the exterior of a hub cap for rotation with said hub cap, said housing defining at least one air passageway extending therethrough and being rotatably mounted on said shaft member such that said air passageway in said shaft communicates with said air passageway in said housing, whereby air flow is directed from said source through said flexible tube member and said stationary shaft member to said rotatable housing; and an air hose assembly communicating said air passageway in said rotatable housing with at least one of the vehicle tires. - View Dependent Claims (15, 16, 17)
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18. A rotary union assembly for use in an automatic tire inflation system for maintaining a desired pressure in a plurality of pneumatic tires mounted on the wheels of a vehicle having a source of pressurized air for fluid communication with the tires and a hub cap at the end of each axle for providing a lubrication compartment for the wheel bearings, said assembly comprising:
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a stationary fitting carried by an end of an axle and defining an open channel extending axially therethrough; a stationary tubular member defining an upstream end portion and a downstream end portion, said upstream end portion extending axially into the interior of said axle through an end thereof and communicating with the source of pressurized air; an o-ring disposed in said stationary fitting about said channel, said o-ring inhibiting rotation of said tubular member within said fitting while allowing said tubular member to be axially translatable with respect to said o-ring; and a housing, attachable to the exterior of a hub cap for rotation with said hub cap, said housing defining at least one air passageway extending therethrough and being rotatably mounted on said downstream end portion of said tubular member such that said tubular member communicates the source of pressurized air with said passageway in said housing, whereby air flow is directed from said source through said stationary tubular member to said rotatable housing. - View Dependent Claims (19, 20)
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21. A rotary union assembly for use in an automatic tire inflation system for maintaining a desired pressure in a plurality of pneumatic tires mounted on the wheels of a vehicle having a source of pressurized air for fluid communication with the tires and a hub cap at the end of each axle for providing a lubrication compartment for the wheel bearings, said assembly comprising:
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a stationary tubular member defining an upstream end portion and a downstream end portion, said upstream end portion extending axially into the interior of said axle through an end thereof and communicating with the source of pressurized air, said tubular member being axially translatable with respect to said end of the axle whereby the axial spacing between the axle end and said housing can be varied; and a housing, attachable to the exterior of a hub cap for rotation with said hub cap, said housing defining at least one air passageway extending therethrough and being rotatably mounted on said downstream end portion of said tubular member such that said tubular member communicates the source of pressurized air with said passageway in said housing, whereby air flow is directed from said source through said stationary tubular member to said rotatable housing. - View Dependent Claims (22)
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23. A rotary union assembly for use in an automatic tire inflation system for maintaining a desired pressure in a plurality of pneumatic tires mounted on the wheels of a vehicle having a source of pressurized air for fluid communication with the tires and a hub cap at the end of each axle for providing a lubrication compartment for the wheel bearings, said assembly comprising:
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a stationary tubular member defining an upstream end portion and a downstream end portion, said upstream end portion extending axially into the interior of said axle through an end thereof and communicating with the source of pressurized air; a housing, attachable to the exterior of a hub cap for rotation with said hub cap, said housing defining at least one air passageway extending therethrough and being rotatably mounted on said downstream end portion of said tubular member such that said tubular member communicates the source of pressurized air with said passageway in said housing, whereby air flow is directed from said source through said stationary tubular member to said rotatable housing; and a rotary union comprising a rotary element and a stationary element, said elements being in an abutting disposition in said air passageway within said housing for communicating said air flow with at least one of said tires. - View Dependent Claims (24, 25, 26, 27)
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28. A rotary union assembly for use in an automatic tire inflation system for maintaining a desired pressure in a plurality of pneumatic tires mounted on the wheels of a vehicle having a source of pressurized air for fluid communication with the tires and a hub cap at the end of each axle for providing a lubrication compartment for the wheel bearings, said assembly comprising:
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a stationary tubular member defining an upstream end portion and a downstream end portion, said upstream end portion extending axially into the interior of said axle through an end thereof and communicating with the source of pressurized air; a housing attachable to the exterior of a hub cap for rotation with said hub cap, said housing defining at least one air passageway extending therethrough and being rotatably mounted on said downstream end portion of said tubular member such that said tubular member communicates the source of pressurized air with said air passageway in said housing, whereby air flow is directed from said source through said stationary tubular member to said rotatable housing; and a rotary union disposed in said air passageway within said housing exteriorly of the lubrication compartment for communicating said air flow with at least one of said tires, said rotary union comprising a first bearing surface defined by said downstream end portion of said tubular member and a second bearing surface engaging said first surface and being rotatable with said housing. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. A rotary union assembly for use in an automatic tire inflation system for maintaining a desired pressure in a plurality of pneumatic tires mounted on the wheels of a vehicle of a type having sealed axles, a source of pressurized air for fluid communication with the axle and a hub cap at the end of each axle for providing a lubrication compartment for the wheel bearings, said assembly comprising:
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a stationary fitting carried by an end of a sealed axle and defining an open channel extending axially therethrough; an annular sealing member disposed in said fitting about said channel; a stationary tubular member defining an upstream end portion and a downstream end portion, said upstream end portion extending axially through said channel in said fitting and communicating with the interior of said axle, said sealing member engaging said tubular member and forming an airtight seal within said fitting about said tubular member; a housing attachable to the exterior of a hub cap for rotation with said hub cap, said housing defining at least one air passageway extending therethrough and being rotatably mounted on said downstream end portion of said tubular member such that said tubular member communicates the interior of said axle with said air passageway in said housing, whereby air flow is directed from said sealed axle through said stationary tubular member to said rotatable housing; and a rotary union disposed in said air passageway within said housing exteriorly of the lubrication compartment for communicating said air flow with at least one of said tires, said rotary union comprising a first bearing surface defined by said downstream end portion of said tubular member and a second bearing surface engaging said first surface and being rotatable with said housing. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51)
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52. A rotary union assembly for use in an automatic tire inflation system for maintaining a desired pressure in a plurality of pneumatic tires mounted on the wheels of a vehicle having a source of pressurized air for fluid communication with the tires and a hub cap at the end of each axle for providing a lubrication compartment for the wheel bearings, said assembly comprising:
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a stationary tubular member defining an upstream end portion and a downstream end portion, said upstream end portion extending axially into the interior of said axle through an end thereof and communicating with the source of pressurized air; a housing attachable to the exterior of a hub cap for rotation with said hub cap, said housing defining at least one air passageway extending therethrough and being rotatably mounted on said downstream end portion of said tubular member such that said tubular member communicates the source of pressurized air with said air passageway in said housing, whereby air flow is directed from said source through said stationary tubular member to said rotatable housing; and a rotary union disposed in said air passageway within said housing exteriorly of the lubrication compartment for communicating said air flow with at least one of said tires, said rotary union comprising a bearing surface defined by said downstream end portion of said tubular member and a rigid sealing member rotatable with said housing, said sealing member defining an upstream end face engaging said bearing surface and having an open ended channel extending therethrough, said channel being axially aligned with said tubular member. - View Dependent Claims (53, 54, 55, 56, 57)
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58. A rotary union assembly for use in an automatic tire inflation system for maintaining a desired pressure in a plurality of pneumatic tires mounted on the wheels of a vehicle having a source of pressurized air for fluid communication with the tires and a hub cap at the end of each axle for providing a lubrication compartment for the wheel bearings, said assembly comprising:
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a stationary fitting carried by an end of an axle and defining an open channel extending axially therethrough; a stationary tubular member defining an upstream end portion and a downstream end portion, said upstream end portion extending axially through said channel in said fitting into the interior of said axle and communicating with the source of pressurized air; a housing attachable to the exterior of a hub cap for rotation with said hub cap, said housing defining at least one air passageway extending therethrough and being rotatably mounted on said downstream end portion of said tubular member such that said tubular member communicates the source of pressurized air with said air passageway in said housing, whereby air flow is directed from said source through said stationary tubular member to said rotatable housing; a rotary union disposed in said air passageway within said housing exteriorly of the lubrication compartment for communicating said air flow with at least one of said tires; and an air hose assembly communicating said air passageway in said rotatable housing with at least one of the vehicle tires. - View Dependent Claims (59, 60, 61, 62, 63, 64, 65)
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66. A rotary union assembly for use in an automatic tire inflation system for maintaining a desired pressure in a plurality of pneumatic tires mounted on the wheels of a vehicle having a source of pressurized air for fluid communication with the tires and a hub cap at the end of each axle for providing a lubrication compartment for the wheel bearings, said assembly comprising:
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a tubular member defining an upstream end portion and a downstream end portion, said upstream end portion extending axially into the interior of said axle through an end thereof and communicating with the source of pressurized air; a housing attachable to the exterior of a hub cap for rotation with said hub cap, said housing defining at least one air passageway extending therethrough and being rotatably mounted on said downstream end portion of said tubular member such that said tubular member communicates the source of pressurized air with said air passageway in said housing, whereby air flow is directed from said source through said stationary tubular member to said rotatable housing; and a rotary union disposed in said air passageway within said housing exteriorly of the lubrication compartment for communicating said air flow with at least one of said tires, said rotary union comprising a first bearing surface defined by said downstream end portion of said tubular member and a rigid sealing member disposed within said air passageway within said housing, said rigid sealing member defining a second bearing surface thereon abutting said first bearing surface and being rotatable with said housing and with respect to said first bearing surface. - View Dependent Claims (67, 68, 69, 70, 71, 72)
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73. A rotary union assembly for use in an automatic tire inflation system for maintaining a desired pressure in a plurality of pneumatic tires mounted on the wheels of a vehicle having a source of pressurized air for fluid communication with the tires and a hub cap at the end of each axle for providing a lubrication compartment for the wheel bearings, said assembly comprising:
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a stationary fitting carried by an end of an axle and defining an open channel extending axially therethrough; a stationary tubular member defining an upstream end portion and a downstream end portion, said upstream end portion extending axially into the interior of said axle through an end thereof and communicating with the source of pressurized air; an o-ring disposed in said stationary fitting about said channel, said o-ring inhibiting rotation of said tubular member within said fitting while allowing said tubular member to be axially translatable with respect to said o-ring; a housing, attachable to the exterior of a hub cap for rotation with said hub cap, said housing defining at least one air passageway extending therethrough and being rotatably mounted on said downstream end portion of said tubular member such that said tubular member communicates the source of pressurized air with said passageway in said housing, whereby air flow is directed from said source through said stationary tubular member to said rotatable housing; and a rotary union comprising a rotary element and a stationary element, said elements being in an abutting disposition in said air passageway within said housing for communicating said air flow with at least one of said tires. - View Dependent Claims (74, 75, 76, 77)
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78. A rotary union assembly for use in an automatic tire inflation system for maintaining a desired pressure in a plurality of pneumatic tires mounted on the wheels of a vehicle having a source of pressurized air for fluid communication with the tires and a hub cap at the end of each axle for providing a lubrication compartment for the wheel bearings, said assembly comprising:
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a stationary tubular member defining an upstream end portion and a downstream end portion, said upstream end portion extending axially into the interior of said axle through an end thereof and communicating with the source of pressurized air; a housing, attachable to the exterior of a hub cap for rotation with said hub cap, said housing defining at least one air passageway extending therethrough and being rotatably mounted on said downstream end portion of said tubular member such that said tubular member communicates the source of pressurized air with said passageway in said housing, whereby air flow is directed from said source through said stationary tubular member to said rotatable housing; and a rotary union disposed in said air passageway within said housing for communicating said air flow with at least one of said tires, said rotary union comprising a first bearing surface defined by said downstream end portion of said tubular member and a second bearing surface engaging said first surface and being rotatable with said housing. - View Dependent Claims (79)
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80. A rotary union assembly for use in an automatic tire inflation system for maintaining a desired pressure in a plurality of pneumatic tires mounted on the wheels of a vehicle having a source of pressurized air for fluid communication with the tires and a hub cap at the end of each axle for providing a lubrication compartment for the wheel bearings, said assembly comprising:
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a stationary fitting carried by an end of an axle and defining an open channel extending axially therethrough; a stationary tubular member defining an upstream end portion and a downstream end portion, said upstream end portion extending axially into the interior of said axle through an end thereof and communicating with the source of pressurized air; an o-ring disposed in said stationary fitting about said channel, said o-ring inhibiting rotation of said tubular member within said fitting while allowing said tubular member to be axially translatable with respect to said o-ring; a housing, attachable to the exterior of a hub cap for rotation with said hub cap, said housing defining at least one air passageway extending therethrough and being rotatably mounted on said downstream end portion of said tubular member such that said tubular member communicates the source of pressurized air with said passageway in said housing, whereby air flow is directed from said source through said stationary tubular member to said rotatable housing; and a rotary union disposed in said air passageway within said housing for communicating said air flow with at least one of said tires, said rotary union comprising a first bearing surface defined by said downstream end portion of said tubular member and a second bearing surface engaging said first surface and being rotatable with said housing.
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Specification