ENDLESS TRACK FOR AN OFF-ROAD WORK VEHICLE TO PRODUCE A NET NON-NULL LATERAL FORCE
An endless track for providing traction to an off-road work vehicle (e.g., a construction vehicle, agricultural vehicle, or forestry vehicle). The endless track has a longitudinal axis and comprises an inner side for engaging a drive wheel of the off-road work vehicle to move the endless track and a ground-engaging outer side for engaging the ground. The ground-engaging outer side comprises a tread pattern characterized in that, when the off-road work vehicle moves on the ground, the tread pattern produces lateral traction force components acting laterally on the endless track such that a resultant of the lateral traction force components is a net non-null lateral force acting on the endless track in a lateral direction generally perpendicular to the longitudinal axis. For example, the net non-null lateral force can be used to oppose undesirable side loads and/or tendencies for lateral movements that may be experienced by the endless track due to intrinsic mechanical imbalances which may arise in the vehicle (e.g., “toe-in”, negative camber, etc.), motion of the vehicle on the ground (e.g., if the vehicle turns almost exclusively or significantly more often on one side), and/or use of a working implement with which the vehicle may be equipped.
1 . An endless track for providing traction to an off-road work vehicle, the endless track having a longitudinal axis and comprising:
an inner side for engaging a drive wheel of the off-road work vehicle to move the endless track; and
a ground-engaging outer side for engaging the ground, the ground-engaging outer side comprising a tread pattern characterized in that, when the off-road work vehicle moves on the ground, the tread pattern produces lateral traction force components acting laterally on the endless track such that a resultant of the lateral traction force components is a net non-null lateral force acting on the endless track in a lateral direction generally perpendicular to the longitudinal axis.
2 . An endless track as claimed in claim 1 , the lateral traction force components including opposite lateral traction force components having different magnitudes.
3 . An endless track as claimed in claim 2 , the longitudinal axis being a central longitudinal axis, the tread pattern being asymmetrical relative to the central longitudinal axis.
4 . An endless track as claimed in claim 3 , the tread pattern comprising a plurality of tread projections projecting outwardly, the tread projections being arranged in at least two rows running longitudinally along the endless track, the projections in a first one of the rows crossing the central longitudinal axis, the projections in a second one of the rows not crossing the central longitudinal axis.
5 . An endless track as claimed in claim 3 , the tread pattern comprising a plurality of tread projections projecting outwardly, the tread projections being arranged in at least two rows running longitudinally along the endless track, at least some of the projections in a first one of the rows being longer than at least some of the projections in a second one of the rows.
6 . An endless track as claimed in claim 3 , the tread pattern comprising a plurality of tread projections projecting outwardly, the tread projections being arranged in at least two rows running longitudinally along the endless track, at least some of the projections in a first one of the rows having a first shape, at least some of the projections in a second one of the rows having a second shape different from the first shape.
7 . An endless track as claimed in claim 1 , comprising an elastomeric body reinforced with reinforcements.
8 . An endless track as claimed in claim 7 , the reinforcements comprising at least one of a layer of longitudinal cables and a layer of fabric.
9 . An endless track as claimed in claim 7 , the reinforcements comprising a plurality of transverse metallic core members.
10 . An off-road work vehicle comprising an endless track as claimed in claim 1 .
11 . An off-road work vehicle as claimed in claim 10 , the off-road work vehicle being a construction vehicle, an agricultural vehicle or a forestry vehicle.
12 . A method for opposing a tendency for an endless track of an off-road work vehicle to move in a first lateral direction as the off-road work vehicle moves on the ground, the method comprising:
providing the endless track with a tread pattern that generates, as the off-road work vehicle moves on the ground, a net non-null lateral force acting on the endless track in a second lateral direction generally opposite the first lateral direction; and
driving the off-road work vehicle to give rise to the net non-null lateral force.
13 . A method as claimed in claim 12 , the tendency for the endless track to move in the first lateral direction resulting from an intrinsic mechanical imbalance of the off-road work vehicle.
14 . A method as claimed in claim 13 , the intrinsic mechanical imbalance tending to induce at least one of negative camber of the off-road work vehicle and toe-in of the endless track.
15 . A method as claimed in claim 12 , the net non-null lateral force being a resultant of opposite lateral traction force components having different magnitudes.
16 . A method as claimed in claim 12 , the endless track having a central longitudinal axis, the tread pattern being asymmetrical relative to the central longitudinal axis.
17 . A method as claimed in claim 16 , the tread pattern comprising a plurality of tread projections projecting outwardly, the tread projections being arranged in at least two rows running longitudinally along the endless track, the projections in a first one of the rows crossing the central longitudinal axis, the projections in a second one of the rows not crossing the central longitudinal axis.
18 . A method as claimed in claim 16 , the tread pattern comprising a plurality of tread projections projecting outwardly, the tread projections being arranged in at least two rows running longitudinally along the endless track, at least some of the projections in a first one of the rows being longer than at least some of the projections in a second one of the rows.
19 . A method as claimed in claim 16 , the tread pattern comprising a plurality of tread projections projecting outwardly, the tread projections being arranged in at least two rows running longitudinally along the endless track, at least some of the projections in a first one of the rows having a first shape, at least some of the projections in a second one of the rows having a second shape different from the first shape.
20 . A method for reducing wear in an endless track of an off-road work vehicle carrying a working implement that creates a non-uniform lateral load distribution whereby the vehicle is subjected to a higher loading on one of its sides which tends to steer the vehicle in a first direction, the method comprising:
providing the endless track with a tread pattern that generates, as the vehicle moves on the ground, a net force acting laterally on the endless track and tending to steer the vehicle in a second direction that is generally opposite the first direction; and
driving the vehicle on the ground to give rise to the net force.