# US 11,110,994 B2 · Snowmobile > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,110,994 B2 - Document ID: US11110994B2 - Status: Granted - Kind: B2 - Application number: 15/899,406 - Filed: 2018-02-20 - Published: 2018-08-23 - Granted: 2021-09-07 - Earliest claimed: 2017-02-20 - Assignees: Polaris Industries Inc. - Applicants: Polaris Industries Inc. - Inventors: Michael A. Hedlund; Corey D. Omdahl; Jeffrey A. Eaton; Ronald W. Bachleitner; Joel R. Schildgen - Web page: https://patentgrep.com/patent/US11110994B2 ## CPC - B62M 27/02: power driven - B62M 2027/027: {Snow mobiles characterised by the tracks} - B62M 2027/028: {Snow mobiles characterised by chassis or bodywork} - B62M: RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR {SINGLE-TRACK} CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES (arrangements or mounting of transmissions in vehicles in general B60K; transmission elements per se F16) ## Abstract A snowmobile comprises a chassis with a front portion and a tunnel, and a power train unit supported by the chassis. The snowmobile further includes a plurality of ground-engaging members cooperating with the power train unit to operate the snowmobile. The plurality of ground-engaging members includes a pair of front skis and an endless track assembly. The track includes a wide track belt and the snowmobile body portions and chassis are adapted to fit the wide track belt. A rear rack assembly is positioned on a rear of the snowmobile frame and can support a passenger seat. ## Claims ### Claim 1 A snowmobile comprising: a chassis having a front bulkhead and a tunnel; the tunnel having a center section and side walls, and the center section defines an upper surface of the tunnel; a structural member positioned at an end of the tunnel sidewall and between the side walls; and a tubular strengthening member coupled to the tunnel sidewall and to the structural member, wherein at least one of the structural member and the tubular strengthening member are positioned below the center section. ### Claim 2 (depends on 1) The snowmobile of claim 1, further comprising a side panel positioned over the tunnel sidewall. ### Claim 3 (depends on 2) The snowmobile of claim 2, further comprising a close-off positioned transversely of the tunnel sidewalls, wherein the structural member, the tubular strengthening member and the side panel are all coupled to the close-off. ### Claim 4 (depends on 1) The snowmobile of claim 1, wherein the structural member is positioned within the tunnel. ### Claim 5 (depends on 1) The snowmobile of claim 1, wherein the tubular strengthening member is positioned laterally outward of the side walls. ### Claim 6 A snowmobile comprising: a frame including side walls, a support platform, and a rear cross-member, the side walls cooperating with the support platform to define a tunnel; an endless belt assembly supported by the frame; a seat coupled to the support platform; and a towing member located rearward of the seat and coupled to the rear cross-member through at least one fastening member, the towing member extending outward from the rear cross-member and the towing member comprising a cavity configured to interface with a towing attachment member. ### Claim 7 (depends on 6) The snowmobile of claim 6, further comprising a snow flap coupled to the rear cross-member and extending downward from the rear cross-member. ### Claim 8 (depends on 7) The snowmobile of claim 7, wherein the snow flap is coupled to the rear cross-member adjacent the towing member. ### Claim 9 (depends on 7) The snowmobile of claim 7, wherein the towing member extends over a portion of the snow flap. ### Claim 10 (depends on 6) The snowmobile of claim 6, further comprising a heat exchanger extending downwardly from the support platform, wherein the rear cross-member is coupled to a surface of the heat exchanger. ### Claim 11 (depends on 6) The snowmobile of claim 6, wherein the at least one fastening member is a screw or a bolt that passes through the rear cross-member. ### Claim 12 (depends on 6) The snowmobile of claim 6, further comprising a cargo frame coupled to the rear cross-member and positioned rearward of the seat. ### Claim 13 (depends on 12) The snowmobile of claim 12, wherein the cargo frame is positioned above the support platform and is coupled to at least one of the support platform and the side walls at a plurality of locations. ### Claim 14 (depends on 12) The snowmobile of claim 12, wherein the cargo frame is coupled to the rear cross-member through at least one connecting member positioned above the towing member and between the cargo frame and rear cross-member. ### Claim 15 A snowmobile comprising: a chassis having a front bulkhead and a tunnel; the tunnel having a center section and side walls; a side panel positioned over the tunnel sidewall; a structural member positioned at an end of the tunnel sidewall and between the side walls; a tubular strengthening member coupled to the tunnel sidewall and to the structural member; and a close-off positioned transversely of the tunnel sidewalls, wherein the structural member, the tubular strengthening member and the side panel are all coupled to the close-off.