UNDERCARRIAGE FOR A POWER MACHINE
This disclosure is related to undercarriages for power machines that have tracks as tractive elements. In some embodiments, an adjustable idler mounting structure for an idler pulley in a track assembly is disclosed. In other embodiments, a roller mounting structure for attaching a roller to a track frame is disclosed. In yet other embodiments, an idler pulley is disclosed.
1 . A roller assembly for use in a track assembly of a tracked power machine, the roller assembly comprising:
a roller configured to engage a track of the power machine;
at least one roller mounting structure configured to couple the roller to a track frame of the power machine, the at least one roller mounting structure including a mono-leaf spring having an aperture through which the roller is attached to the mono-leaf spring.
2 . The roller assembly of claim 1 , wherein the roller mounting structure includes a second mono-leaf spring having an aperture through which the roller is attached to the second mono-leaf spring.
3 . The roller assembly of claim 2 , wherein the mono-leaf spring and the second mono-leaf spring of the roller mounting structure form a pair of mono-leaf springs and are disposed on opposing sides of the roller.
4 . The roller assembly of claim 1 , and further comprising multiple rollers configured to engage the track of the power machine.
5 . The roller assembly of claim 1 , wherein the roller mounting structure includes a fastener configured to be accepted in the aperture of the mono-leaf spring to attach the roller to the mono-leaf spring.
6 . The roller assembly of claim 1 , wherein the mono-leaf spring is a parabolic mono-leaf spring.
7 . The roller assembly of claim 1 , wherein the mono-leaf spring is a tapered spring ending in the aperture through which the roller is attached to the mono-leaf spring.
8 . The roller assembly of claim 1 , wherein the mono-leaf spring includes at least one frame mounting aperture extending from a first major surface of the mono-leaf spring to a second major surface of the mono-leaf spring to accept fasteners for attachment of the roller assembly to a track frame structure.
9 . A track assembly for a tracked power machine, the track assembly comprising:
a track frame;
a track; and
a roller assembly coupled to the track frame, the roller assembly including:
a roller configured to engage the track;
a roller mounting structure configured to couple the roller to the track frame, the roller mounting structure having a mono-leaf spring to which the roller is attached.
10 . The track assembly of claim 9 , wherein the roller mounting structure includes a second mono-leaf spring to which the roller is attached, the mono-leaf spring and the second mono-leaf spring of the roller mounting structure forming a pair of mono-leaf springs disposed on opposing sides of the roller.
11 . The track assembly of claim 10 , and further comprising a plurality of rollers configured to engage the track.
12 . The track assembly of claim 10 , and further comprising a plurality of roller assemblies coupled to the track frame.
13 . The track assembly of claim 9 , wherein the roller mounting structure includes a fastener configured to be accepted in an aperture of the mono-leaf spring to attach the roller to the mono-leaf spring.
14 . The track assembly of claim 9 , wherein the mono-leaf spring is a parabolic mono-leaf spring.
15 . The track assembly of claim 9 , wherein the mono-leaf spring includes at least one aperture extending from a first major surface of the mono-leaf spring to a second major surface of the mono-leaf spring, the track assembly further comprising at least one fastener extending through the at least one aperture to attach the roller assembly to the track frame.
16 . A power machine, comprising:
a frame;
a track assembly coupled to the frame for providing tractive effort to cause the power machine to move over a support surface, including:
a track frame;
a track capable of movement about the track frame;
an idler in communication with the track to provide tension to the track; and
an adjustable mounting structure coupled to the track frame and the idler for supplying tension to the track via the idler, wherein the adjustable mounting structure includes:
a cylinder with a two-piece rod with a first portion of the rod capable of accepting a portion of a second portion, the second portion being coupled to the idler and moveable within and with respect to the first portion; and
a spring member acting against the first portion and the second portion.
17 . The power machine of claim 16 and further comprising:
a roller assembly mounted to the track frame for engaging the track, the roller assembly having a roller and a roller mounting structure coupled to the coupled to the track frame and the roller, the roller mounting structure including a mono-leaf spring.
18 . The power machine of claim 17 , wherein the roller mounting structure of the roller assembly includes a second mono-leaf spring, the mono-leaf spring and the second mono-leaf spring forming a pair of mono-leaf springs disposed on opposing sides of the roller.
19 . The power machine of claim 17 , wherein the track assembly includes a plurality of roller assemblies.
20 . The power machine of 16 , wherein the idler has a radius that joins an idler flange edge with an idler rolling face.