Wheel end tire air pump
First Claim
1. A vehicle wheel end assembly comprising:
- a non-rotating axle component defining a lateral axis;
a rotating axle component supported by at least one bearing for rotation relative to said non-rotating axle component about said lateral axis;
a pump mechanism including a first pump member fixed to said non-rotating axle component and a second pump member mounted for rotation with said rotating axle component wherein said pump mechanism defines a central pump axis that is spaced apart from and parallel to said lateral axis; and
at least one valve adapted to be in fluid communication with a tire wherein said first pump member drives said second pump member to inflate the tire through said at least one valve when pressure within the tire falls below a predetermined level and wherein a distance between said central pump axis and said lateral axis remains generally constant as said first pump member drives said second pump member.
3 Assignments
0 Petitions
Accused Products
Abstract
A wheel end assembly includes a self-contained air pump mechanism that maintains tire pressure at a desired level. The pump mechanism includes a piston and cylinder assembly that rotate with the tire. A linkage assembly drives the piston within the cylinder as the wheel end assembly rotates to pump air into the tire via a valve. The linkage assembly includes a first link fixed to a non-rotating wheel end component and a second link that rotates relative to the first link and which is coupled to drive the piston within the cylinder. The tire valve is in fluid communication with the cylinder and automatically opens when air pressure in the tire falls below a predetermined level and automatically closes when the air pressure achieves the predetermined level. An atmospheric valve is in fluid communication with the cylinder, and automatically opens to recharge the cylinder once the initial pressure charge has been delivered to the tire.
-
Citations
26 Claims
-
1. A vehicle wheel end assembly comprising:
-
a non-rotating axle component defining a lateral axis;
a rotating axle component supported by at least one bearing for rotation relative to said non-rotating axle component about said lateral axis;
a pump mechanism including a first pump member fixed to said non-rotating axle component and a second pump member mounted for rotation with said rotating axle component wherein said pump mechanism defines a central pump axis that is spaced apart from and parallel to said lateral axis; and
at least one valve adapted to be in fluid communication with a tire wherein said first pump member drives said second pump member to inflate the tire through said at least one valve when pressure within the tire falls below a predetermined level and wherein a distance between said central pump axis and said lateral axis remains generally constant as said first pump member drives said second pump member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 25)
-
-
10. The vehicle wheel end assembly as set forth in 8 wherein said second pump member includes a pressure charge held within a chamber, said pressure charge being automatically delivered to the tire through said first one-way check valve when the pressure within the tire falls below said predetermined level and wherein said second one-way check valve automatically draws air into said chamber from the atmosphere once said pressure charge has been delivered into the tire.
-
17. A trailer axle wheel end assembly comprising:
-
a spindle mounted to an axle beam defining a central axis;
a wheel hub rotatably supported on said spindle for rotation about said central axis; and
an air pump defining a central pump axis that is spaced apart from and parallel to said central axis, said air pump including a first link fixed to said spindle, a piston and cylinder assembly mounted for rotation with said wheel hub, and a second link interconnecting said first link to said piston and cylinder assembly such that as said wheel hub rotates said first link drives said second link which drives said piston and cylinder assembly to automatically pump air into a tire when air pressure within the tire falls below a predetermined level wherein a distance between said central pump axis and said central axis remains generally constant as said first link drives said second link. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 26)
-
Specification