Track system
A track system for use with a vehicle includes an attachment assembly connectable to the chassis of the vehicle having a multi-pivot assembly having a first pivot extending longitudinally and defining a roll pivot axis, and a second pivot extending laterally and defining a pitch pivot axis. A frame assembly is disposed laterally outwardly from the attachment assembly and connected thereto. The frame assembly includes at least one wheel-bearing frame member. The track system further includes at least one actuator connected between the attachment assembly and the frame assembly for pivoting the frame assembly about the roll pivot axis, a leading idler wheel assembly, a trailing idler wheel assembly, at least one support wheel assembly, and an endless track.
1 . A track system for use with a vehicle having a chassis and a driveshaft extending laterally outwardly from the chassis, the track system comprising:
an attachment assembly connectable to the chassis of the vehicle and defining a pitch pivot axis;
a frame assembly disposed laterally outwardly from the attachment assembly and connected to the attachment assembly, the frame assembly being pivotable about the pitch pivot axis, and the frame assembly including at least one wheel-bearing frame member;
a leading idler wheel assembly at least indirectly connected to the at least one wheel-bearing frame member;
a trailing idler wheel assembly at least indirectly connected to the at least one wheel-bearing frame member;
at least one support wheel assembly at least indirectly connected to the at least one wheel-bearing frame member, and the at least one support wheel assembly being disposed between the leading idler wheel assembly and the trailing idler wheel assembly;
an endless track extending around the leading idler wheel assembly, the trailing idler wheel assembly, and the at least one support wheel assembly;
a sprocket wheel at least indirectly connected to the drive shaft for driving the endless track; and
at least one idler actuator for adjusting the pivotal positioning of at least one of the leading and trailing idler wheel assemblies relative to the frame assembly including raising the at least one of the leading and trailing idler wheel assemblies to reduce an amount of endless track in flat ground contact and lowering the at least one of the leading and trailing idler wheel assemblies to increase the amount of endless track in flat ground contact;
wherein:
a first torque is applied to the frame assembly about the pitch pivot axis when the at least one of the leading and trailing idler wheel assemblies is lowered, and
a second torque being greater in magnitude than the first torque is applied to the frame assembly about the pitch pivot axis when the at least one of the leading and trailing idler wheel assemblies is raised.
2 . The track system of claim 1 , wherein actuation of the at least one idler actuator modulates at least one of an approach angle of the track system and a departure angle of the track system.
3 . The track system of claim 1 , wherein:
the frame assembly includes:
a leading frame member pivotably connected to the attachment assembly for pivoting about the pitch pivot axis, and
a trailing frame member pivotably connected to the attachment assembly for pivoting about the pitch pivot axis, the trailing frame member pivoting independently from the leading frame member.
4 . The track system of claim 3 , wherein the at least one wheel-bearing frame member includes:
a leading wheel-bearing frame member at least indirectly pivotably connected to the leading frame member, and
a trailing wheel-bearing frame member at least indirectly pivotably connected to the trailing frame member.
5 . The track system of claim 4 , wherein a load supported by the trailing wheel-bearing frame member is greater than a load supported by the leading wheel-bearing frame member.
6 . The track system of claim 3 , wherein the track system further includes a damper interconnecting the leading frame member and the trailing frame member.
7 . The track system of claim 6 , wherein the damper is connected to an upper end of the leading frame member and an upper end of the trailing frame member.
8 . The track system of claim 6 , wherein the damper is configured to limit relative range of motion between the leading frame member and the trailing frame member.
9 . The track system of claim 1 , wherein the at least one idler actuator includes:
a first idler actuator for adjusting the pivotal positioning of the leading idler wheel assembly relative to the frame assembly; and
a second idler actuator for adjusting the pivotal positioning of the trailing idler wheel assembly relative to the frame assembly.
10 . The track system of claim 1 , further comprising:
at least one monitoring sensor for determining, at least indirectly, at least one of a state of the track system and a ground surface condition; and
a track system controller communicating with the at least one monitoring sensor for receiving a signal indicative of the at least one of the state of the track system and the ground surface condition, the track system controller being configured to connect to and to control the operation of the at least one idler actuator based on the at least one of the state of the track system and the ground surface condition.
11 . The track system of claim 10 , wherein the track system controller controls the operation of the at least one actuator in response to a second signal received from a manual override, a master control unit mounted to the vehicle, a remote processing unit, or a remote master control unit.
12 . The track system of claim 10 , wherein the at least one monitoring sensor includes at least one of a load sensor, temperature sensor, accelerometer, strain gauge, fluid property sensor, inclinometer, actuator assembly position sensor, geographical location sensor, hygrometer, penetrometer, sonar device, ultrasonic device, microwave-based device, radar device, and lidar device.
13 . The track system of claim 10 , wherein the track system controller controls the operation of the at least one idler actuator in accordance with a predetermined objective.
14 . The track system of claim 13 , wherein the predetermined objective is to limit pitching of the frame assembly about the pitch pivot axis.
15 . The track system of claim 1 , wherein:
the attachment assembly includes:
a pitch pivot defining the pitch pivot axis, the frame assembly being connected to the pitch pivot; and
a roll pivot defining a roll pivot axis of the track system,
the track system further includes: at least one actuator connected between the attachment assembly and the frame assembly for pivoting the frame assembly about the roll pivot axis.
16 . The track system of claim 15 , wherein the attachment assembly further includes a yaw pivot defining a yaw pivot axis of the track system, the frame assembly being further pivotable about the yaw pivot axis upon operation of the at least one actuator.
17 . The track system of claim 16 , wherein the at least one actuator includes first, second and third actuators, the first actuator being operable for pivoting the frame assembly about the roll pivot axis, and the second and third actuators being operable for pivoting the frame assembly about the yaw pivot axis.
18 . The track system of claim 17 , wherein the second actuator is a leading tracking actuator located forward of the roll pivot, and the third actuator is a trailing tracking actuator located rearward of the roll pivot.
19 . A vehicle having first and second track systems according to claim 1 , wherein the track system controller of the first track system is at least indirectly connected to the track system controller of the second track system, and the track system controller of the first track system controls the operation of the at least one idler actuator of the first track system based on the at least one of the state of the second track system and the ground surface condition determined by the at least one monitoring sensor of the second track system.