The present disclosure relates to a tracked undercarriage system for a machine, and more particularly relates to a link assembly of the tracked undercarriage system.
Machines, such as excavators may include a tracked undercarriage system for providing traction between ground surface and the machine. The undercarriage system includes a roller track frame having various guiding components to support a link assembly. The link assembly moves over the roller track frame relative to the guiding components to move the machine. The link assembly includes an endless track link assembly which slides over the roller track frame with the help of the guiding components. The track link assembly includes multiple pairs of track links. The link assembly further includes multiple track shoes corresponding to the multiple pairs of track links. The track shoes engage with the ground surface. Further, the track shoes are generally coupled to the pairs of track links via bolts and nuts. The bolts and nuts may loosen over a time, and hence the track shoe may be disconnected from the track link. Further, high tolerance requirements for bolted joints make design of the link assembly complex and cost intensive. Additionally, assembly of the track shoes with the pairs of track links may require increased time and effort.
US Patent Publication Number 2014/0001827 discloses an undercarriage assembly. The undercarriage assembly includes a link assembly having a plurality of laterally spaced pairs of track links pivotally connected to one another at pivot joints to form an endless chain. The undercarriage assembly may also include an idler. The idler includes a solid disk with substantially planar sides and an outer tread surface engaging an inner portion of the endless chain.
In one aspect of the present disclosure, a link assembly for a track-type machine is provided. The link assembly includes a plurality of laterally spaced pairs of track links. Each track link of the pairs of track links includes an elongate body. The elongate body includes a first end and a second end distal to the first end. The elongate body further includes a shoe face extending between the first end and the second end. The elongate body further includes one or more protrusions extending from the shoe face. The link assembly further includes a plurality of track shoes configured to be engaged with the shoe face of the plurality of the pairs of track links. Each of the track shoes includes a base defining a top surface and a bottom surface distal to the top surface. The track shoe further includes one or more apertures extending between the top surface and the bottom surface configured to receive the one or more protrusions therethrough. The protrusions are configured to be deformed to fixedly engage the track shoe with the track link and further the bottom surface of the base abuts the shoe face of the track link.
In another aspect of the present disclosure, a link assembly for a track-type machine is provided. The link assembly includes a track shoe having a base. The base includes a top surface and a bottom surface distal to the top surface. The link assembly further includes a pair of track links laterally disposed with respect to each other. Each of the pair of track links includes a shoe face configured to abut the bottom surface of the track shoe. The link assembly further includes a retaining member disposed on the bottom surface of the track shoe and disposed between each track link of the pair of track links. The retaining member has a first end and a second end adjacent to a corresponding track link of the pair of track links. The first end and the second end of the retaining member are configured to be deformed to fixedly engage with the corresponding track link of the pair of track links.
In yet another aspect of the present disclosure, a link assembly for a track-type machine is provided. The link assembly includes a plurality of laterally spaced pairs of track links. Each track link of the pairs of track links includes an elongate body. The elongate body includes a first end and a second end distal to the first end. The elongate body further includes a shoe face extending between the first end and the second end. The elongate body further includes a protrusion extending from the shoe face. The protrusion includes a first leg member and a second leg member extending from the shoe face and defines a slot therebetween. The protrusion further includes a head member disposed adjacent to the first leg member and the second leg member. The head member has a diameter. The link assembly further includes a plurality of track shoes configured to be engaged with the shoe face of the plurality of the pairs of track links. Each of the track shoes includes a base defining a top surface and a bottom surface distal to the top surface. The track shoe further includes an aperture extending between the top surface and the bottom surface. The aperture is configured to receive the protrusion therethrough. The aperture defines a second diameter that is less than the first diameter of the head member. The first leg member and the second leg member are deflected to be received through the aperture. The head member of the first leg member and the second leg member is configured to engage the track shoe with the track link.
Other features and aspects of this disclosure will be apparent from the following description and the accompanying drawings.
Reference will now be made in detail to specific embodiments or features, examples of which are illustrated in the accompanying drawings. Wherever possible, corresponding or similar reference numbers will be used throughout the drawings to refer to the same or corresponding parts.
The elongate body 134 further includes one or more protrusions 136 extending from the shoe face 134C. The protrusions 136 are configured to engage the track shoe 132 with the track link 126. In the illustrated embodiment, the elongate body 134 includes a first protrusion 136A extending from the shoe face 134C adjacent to the first end 134A. The elongate body 134 further includes a second protrusion 136B extending from the shoe face 134C adjacent to the second end 134B. However, it may be contemplated that the elongate body 134 may include any number of protrusions 136 to engage the track shoe 132 with the track link 126. In an embodiment, the first protrusion 136A and the second protrusion 136B are integrally formed with the elongate body 134 of the first track link 128. In an alternative embodiment, the first and the second protrusions 136A, 136B may be a separate part. In such a case, the first track link 128 may include a pair of holes defined on the shoe face 134C to engage with the first and the second protrusions 136A, 136B. Further, the first protrusion 136A and the second protrusion 136B extend vertically from the shoe face 134C.
Similar to the first track link 128, the second track link 130 includes an elongate body 138 having a first end 138A, a second end 138B, a shoe face 138C, a roller face 138D, a first side surface 138E and a second side surface 138F. Further, the second track link 130 includes a first opening 130A and a second opening 130B. The elongate body 138 also includes protrusions 140, such as a first protrusion 140A and a second protrusion 140B. The above described construction of the first and second track links 128, 130 is exemplary.
In various examples, the link assembly 116 may include a forged offset track link assembly, a forged inline track link assembly and a plate type inline track link assembly. In the forged offset and inline track link assemblies, the first and second protrusions 136A, 136B, 140A, 140B may be integrally forged with the elongate bodies 134, 138 of each of the track links 128, 130, respectively, of the pair of track links 126.
In the illustrated embodiment, each of the protrusions 136, 140 may have a circular cross section defining a diameter. In various embodiments, the cross section of the protrusions 136, 140 may be a square, a rectangular, an elliptical or a polygonal shape.
In an exemplary embodiment, a method of assembling the plate type offset track link assembly is described in detail for illustration purpose of the present disclosure. Each pair of track links 126 includes a pin member 142 having a first end 144 and a second end 146 distal to the first end 144. Each of the first end 144 and the second end 146 includes a first diameter portion (not shown) and a second diameter portion (not shown) adjacent to the first diameter portion. The first diameter portions at the first and the second ends 144, 146 of the pin member 142 may be configured to engage with the second openings 128B, 130B of the first and the second track links 128, 130, respectively.
During assembly of the pair of track links 126, the first track link 128 and the second track link 130 may be laterally spaced adjacent to the first and second ends 144, 146, respectively, of the pin member 142. Further, the pin member 142 may be co-axially aligned with the second openings 128B, 130B. The first track link 128 and the second track link 130 may be moved towards each other to engage with the first diameter portions of the first and the second ends 144, 146, respectively, of the pin member 142. The first openings 128A, 130A of the first and the second track links 128, 130 of another pair of track links 126 may be pivotally engaged with the second diameter portions at the first and second ends 144, 146, respectively, of the pin member 142. Thus, the pair of track links 126 may pivotally move relative to the adjacent pair of track links 126 about the pin member 142. Thus, each of the pair of track links 126 of the link assembly 116 pivotally move relative to the adjacent pair of track links 126 about the corresponding pin member 142.
In an embodiment, the portion 160 of the each of the set of protrusions 136, 140 is deformed to the deformed portion 162 by a hot upset forming process. In an example, the hot forming process may use heat and pressure to engage the track shoe 132 with the pair of track links 126. Machine used for the hot upset forming process may heat the portion 160 of each of the set of protrusions 136, 140 to make the portions 160 malleable. Further, a pressure may be applied on the heated portion to form the deformed portion 162, thereby engaging the track shoe 132 with the pair of track links 126. In another embodiment, the portions 160 may be deformed by press forming using a pressing machine, such as a hydraulic press.
The elongate body 204 further includes one or more protrusions 206 extending from the shoe face 204C. The protrusions 206 are configured to engage the track shoe 132 with the track link 202. In the illustrated embodiment, the elongate body 204 includes a first protrusion 206A extending from the shoe face 204C adjacent to the first end 204A of the elongate body 204. The elongate body 204 also includes a second protrusion 206B extending from the shoe face 204C adjacent to the second end 204B of the elongate body 204. However, it may be contemplated that the elongate body 204 may include any number of protrusions 206 to engage the track shoe 132 with the track link 202. The first protrusion 206A and the second protrusion 206B are integrally formed with the elongate body 204 of the track link 202. Further, the first protrusion 206A and the second protrusion 206B extend vertically from the shoe face 204C. In various embodiments, the first and second protrusions 206A, 206B may be integrally formed with a track link associated with the forged offset and inline track link assemblies and the plate type inline track link assembly.
Referring to
During assembly of the track shoe 132 with each of the pair of track links 202, the set of apertures 158A, 158B of the track shoes 132 may be aligned with the set of protrusions 206 of each track link 202. The tapered portion 218 may facilitate the track shoe 132 to move towards the shoe face 204C of the track link 202. Further, the first and the second leg members 208, 210 may deflect towards each other to pass through each of the corresponding apertures 158. The bottom surface 156 of the track shoe 132 further abuts the shoe face 204C of the track link 202 and the inner face 214A of the head member 214 abuts the top surface 152 of the track shoe 132. Thus, the head members 214 of the first and the second leg members 208, 210 are configured to engage the track shoe 132 with the track link 202.
The retaining member 318 further includes a first end 320 and a second end 322. As shown in
In an embodiment, the first track link 302 includes a side surface 312 and the second track link 302B includes a side surface 314 facing the side surface 312 of the first track link 302A. The side surfaces 312, 314 of the first and the second track links 302A, 302B are configured to engage with the first and the second ends 320, 322, respectively, of the retaining member 318.
During assembly of the pair of track links 302 with the track shoe 304, the first and the second track links 302A, 302B may be disposed on the bottom surface 308 of the base 305 adjacent to the first and the second ends 320, 322, respectively, of the retaining member 318. Further, the side surfaces 312, 314 of the first and the second track links 302A, 302B may face each other. The first and the second track links 302A, 302B may be moved towards the first and the second ends 320, 322 of the retaining member 318 relative to the bottom surface 308 of the base 305. The first and the second ends 320, 322 of the retaining member 318 deform to fixedly engage with the corresponding first and the second track links 302A, 302B. Thus, each pairs of the plurality of track links 302 may be engaged with the retaining member 318 disposed on the corresponding track shoe 304. In various embodiments, the pair of track links 302 may be associated with the forged offset and inline track link assemblies and the plate type inline track link assembly.
The present disclosure relates to the link assembly 116 in which each pair of the multiple pairs of track links may be engaged with the corresponding multiple track shoe via integral members. In an embodiment, the integral member includes the set of protrusions 136, 140 of the first and the second track links 128, 130 of the pair of track links 126. In another embodiment, the integral member includes the set of protrusions 206 of the track link 202. In yet another embodiment, the integral member includes the retaining member 318 of the track shoe 304.
As the track links 126, 202, 302 and the track shoes 132, 304, are engaged with each other via the corresponding integral members formed with either the track link or the track shoe, the coupling between the track shoe and the track link may become robust and reliable. Time and effort required for assembling the track links and the track shoe may be reduced compared to the existing assemblies with bolts and nuts. Complexity in design and manufacture of the track links and the track shoe may also be reduced.
While aspects of the present disclosure have been particularly shown and described with reference to the embodiments above, it will be understood by those skilled in the art that various additional embodiments may be contemplated by the modification of the disclosed machines, systems and methods without departing from the spirit and scope of what is disclosed. Such embodiments should be understood to fall within the scope of the present disclosure as determined based upon the claims and any equivalents thereof.