Tracked chassis and work machine having a track drive

{
  "publication_number": "US10266218B2",
  "country": "US",
  "kind": "B2",
  "title": "Tracked chassis and work machine having a track drive",
  "abstract": "A tracked chassis for a working machine has a track which includes at least one roller path, preferably two roller paths extending in parallel, on whose running surface at least one plain roller of the tracked chassis is movable during crawler operation. The running surface of at least one roller path of the track and the running surface of at least one roller have a transverse section with an at least sectionally convex contour.",
  "claims": [
    "1. A tracked chassis for a work machine having a track which comprises a roller path on whose running surface at least one roller of the tracked chassis is movable during crawler operation, wherein the running surface of the roller path of the track has a recess (25), the running surface of the at least one roller has a flange (30) received in the recess (25) and the running surfaces of the roller path and at least one roller each have a transverse section on opposite sides of the respective flange (30) and recess (25) and having a convex or concave contour immediately adjacent the respective flange (30) and recess (25), an outermost convex contour, and being straight between the outermost contour and the contour immediately adjacent the respective flange (30) and recess (25).",
    "2. The tracked chassis in accordance with claim 1, wherein the running surface of the roller path of the track at an inner marginal region of the transverse section has a convex contour and the running surface of the roller has a convex contour at an outwardly disposed marginal region of the transverse section.",
    "3. The tracked chassis in accordance with claim 1, wherein the convex contour of the roller and/or of the track is arcuate and/or complex arcuate.",
    "4. A tracked chassis for a work machine having a track which comprises a roller path on whose running surface at least one roller of the tracked chassis is movable during crawler operation, wherein the running surface of the roller path of the track and the running surface of the at least one roller have a transverse section with a sectionally convex contour, and the length R Horizontal of the transverse section of the surface of the at least one roller is composed of a linear portion R 2 Horizontal and a convex portion R 3 Horizontal, where the following formula applies: 1 10 · R Horizontal < R ⁢ ⁢ 2 Horizontal < 9 10 · R Horizontal ⁢ ⁢ where R ⁢ ⁢ 3 Horizontal = R Horizontal - R ⁢ ⁢ 2 Horizontal.",
    "5. The tracked chassis in accordance with claim 4, wherein due to the convex contour of the convex portion R 3 Horizontal, a height offset R 3 Vertical of the transverse section R Horizontal at a margin side results with respect to the linear contour R 2 Horizontal of the transverse section R Horizontal, where the following formula applies: 1 500 · R Horizontal < R ⁢ ⁢ 3 Vertical < 1 10 · R Horizontal.",
    "6. A tracked chassis for a work machine having a track which comprises a roller path on whose running surface at least one roller of the tracked chassis is movable during crawler operation, wherein the running surface of the roller path of the track and the running surface of the at least one roller have a transverse section with a sectionally convex contour, and the length P Horizontal of the transverse section of at least one running surface of the track is composed of a linear portion P 3 Horizontal and a convex portion P 2 Horizontal, where the following formula applies: P 3 Horizontal =P Horizontal −P 2 Horizontal.",
    "7. The tracked chassis in accordance with claim 6, wherein due to the convex contour of the convex portion P 2 Horizontal, a height offset P 2 Vertical of the transverse section P Horizontal at a margin side results with respect to the linear contour P 3 Horizontal of the transverse section P Horizontal, where the following formula applies: 1 500 · P Horizontal < P ⁢ ⁢ 2 Vertical < 1 10 · P Horizontal.",
    "8. The tracked chassis in accordance with claim 6, wherein the following applies to the relationships of the running surface of the track and of the running surface of the roller: P Horizontal ≥R Horizontal, P 2 Horizontal ≤R 2 Horizontal.",
    "9. The tracked chassis in accordance with claim 1, wherein at least one running surface of the track is divided into a plurality of running surface segments having a linear portion in the transverse direction, with convex portions adjoining the linear portions at both sides.",
    "10. The tracked chassis in accordance with claim 1, wherein the at least one roller comprises a center flange for guiding the plain roller on the track, with side flanks of the center flange having a convex contour at least sectionally in the radial direction.",
    "11. The tracked chassis in accordance with claim 10, wherein a flank section has a contour alternating linearly and convexly in the radial direction.",
    "12. The tracked chassis in accordance with claim 11, wherein each said side flank comprises at least two linear sections which are separated by at least one convex part, with the linear portions having different angles of inclination with respect to the vertical, between 0° and 50° or 0° and 30°, and with the linear portion disposed closer to the center flange dome having a greater inclination.",
    "13. The tracked chassis in accordance with claim 12, wherein at least one running surface of the track is divided into a plurality of running surface segments having a linear portion in the transverse direction, with convex portions adjoining the linear portions at both sides, and the oppositely disposed side wall of the recess of the track receiving the center flange has a convex contour at least sectionally and is composed of a linear portion and a convex portion.",
    "14. The tracked chassis in accordance with claim 13, wherein the linear portion of the side wall of the recess is inclined with respect to the vertical, at an identical angle to the oppositely disposed linear portion of the side flank of the center flange.",
    "15. A crawler excavator or a crawler-mounted crane, having the tracked chassis in accordance with claim 1.",
    "16. A tracked chassis for a work machine having a track which comprises a roller path on whose running surface at least one roller of the tracked chassis is movable during crawler operation, wherein the running surface of the roller path of the track and the running surface of the at least one roller have a transverse section with a sectionally convex contour, the running surface of the roller path of the track at an inner marginal region of the transverse section has a convex contour and the running surface of the roller has a convex contour at an outwardly disposed marginal region of the transverse section, and the convex contour of the roller and/or of the track is arcuate and/or complex arcuate."
  ],
  "description_excerpt": "The invention relates to a tracked chassis for a work machine having a track which comprises at least one roller path, in particular two roller paths extending in parallel, on whose running surface at least one track roller of the tracked chassis is movable during crawler operation.\n\nTracked chassis or crawler chassis comprise at least one revolving crawler track which is composed of a number of track links which are linked to one another in an articulated manner. At least one sprocket wheel provides the drive of the track, with said sprocket wheel being driven via at least one drive unit of the undercarriage and with the toothing of said sprocket wheel engaging into the track links for transferring force. In addition, at least one deflection pulley and a plurality of tension rollers and plain rollers are provided. The deflection pulley and the sprocket wheel are mounted at the front and at the back in the direction of travel, the plain rollers are arranged therebetween along the contact area and the tension rollers are supported disposed opposite the plain rollers in the region of the returning chain run. The deflection pulley, also called the idler, is typically displaceably fastened to the undercarriage and thereby provides the required track tension. The load of the vehicle can be introduced uniformly or non-uniformly into the resulting contact area of the crawler track over the plain rollers.\n\nThe contact surfaces between the plain rollers and the inwardly disposed surfaces of the individual track links are called a roller path, with the roller path being composed of the linked track links.",
  "cpc": [
    "B62D 55/14",
    "B62D 55/08",
    "B62D 55/20",
    "B62D 55/202",
    "B62D 55/21",
    "B66C 9/00",
    "E02F 9/02"
  ],
  "ipc": [
    "B62D 55/14",
    "B62D 55/20",
    "B62D 55/21",
    "B66C 9/00",
    "E02F 9/02"
  ],
  "assignees": [
    "Liebherr Mining Equipment Colmar SAS"
  ],
  "inventors": [
    "Frédéric Neyer",
    "Vincent Dreyer",
    "Oliver Weiss"
  ],
  "filing_date": "2016-01-14",
  "publication_date": "2019-04-23",
  "grant_date": "2019-04-23",
  "priority_date": "2015-01-15",
  "application_number": "US-201614995825-A",
  "family_id": "54396708",
  "cited_by_count": 2,
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  ]
}