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EP-4734748-A1 - DRILL COULTER ASSEMBLY

EP4734748A1EP 4734748 A1EP4734748 A1EP 4734748A1EP-4734748-A1

Abstract

The present invention relates to a drill coulter assembly (1) for a seed drill, comprising a rocker arm (2) on which a coulter disc (4), rotating about a rotational axis (3), is arranged to produce a drill furrow and on which a drill shoe (9), arranged adjacently to the coulter disc (4), is arranged to spread seed and/or fertiliser into the drill furrow, the drill shoe (9) being mounted so as to be pivotable about a pivot pin (11) located adjacently to the coulter disc (4), the pivot pin (11), viewed in the direction of travel (FR), being oriented so as to be inclined downwards at an inclination angle (16) towards the drill furrow.

Inventors

  • BODEWIG, Johannes
  • BEIER, CARSTEN

Assignees

  • Lemken GmbH & Co KG

Dates

Publication Date
20260506
Application Date
20240626

Claims (14)

  1. 1. Sowing coulter arrangement (1) for a seed drill, comprising a rocker arm (2) on which a coulter disc (4) rotating about a rotation axis (3) for creating a sowing furrow and a sowing shoe (9) arranged adjacent to the coulter disc (4) for spreading seed and/or fertilizer into the sowing furrow are arranged, wherein the sowing shoe (9) is pivotally mounted about a pivot axis (11) arranged adjacent to the coulter disc (4), characterized in that the pivot axis (11) is oriented inclined downwards in the direction of the sowing furrow at an angle of inclination (16) as seen in the direction of travel (FR).
  2. 2. Sowing coulter arrangement (1) according to claim 1, characterized in that an end of the pivot axis (11) facing the axis of rotation (3) is arranged substantially at the same height as the axis of rotation (3).
  3. 3. Sowing coulter arrangement (1) according to claim 1 or 2, characterized in that the angle of inclination (16) of the pivot axis (11) is in the range between 5° and 35°.
  4. 4. Sowing coulter arrangement (1) according to one of claims 1 to 3, characterized in that a surface of the coulter disc (4) facing the sowing shoe (9) encloses with the pivot axis (11) an angle of attack (23) which opens when viewed in the direction of travel (FR).
  5. 5. Sowing coulter arrangement (1) according to claim 4, characterized in that the angle of attack (23) of the pivot axis (11) is in the range between 0.5° and 5°.
  6. 6. Sowing coulter arrangement (1) according to one of the preceding claims, characterized in that the sowing shoe (9) is subjected to a prestressing force by a spring element (21) in order to position the sowing shoe (9) in relation to the coulter disc (4) without play and flush with one another.
  7. 7. Sowing coulter arrangement (1) according to one of the preceding claims, characterized in that the sowing shoe (9) has a hollow cylindrical receiving section (17) in which the pivot axis (11) is rotatably mounted, about which the sowing shoe (9) can pivot.
  8. 8. Sowing coulter arrangement (1) according to one of the preceding claims, characterized in that the pivot axis (11) is arranged in a fastening element (19) in a rotationally fixed manner, by means of which the sowing shoe (9) is connected to the rocker arm (2).
  9. 9. Sowing coulter arrangement (1) according to claim 8, characterized in that a cylindrical shoulder is arranged on the fastening element (19) parallel to the pivot axis (11), on which the spring element (21) designed as a leg spring (22) is arranged, one leg of which is supported on the rocker (2) and the other leg of which is supported on the sowing shoe (9).
  10. 10. Sowing coulter arrangement (1) according to claim 8 or 9, characterized in that the fastening element (19) is designed as a cast part or as a component of the rocker (2).
  11. 11. Sowing coulter arrangement (1) according to one of claims 8 to 10, characterized in that the pivot angle (16) and the angle of attack (23) of the pivot axis (11) can be predetermined by the geometry of the fastening element (19).
  12. 12. Sowing coulter arrangement (1) according to one of the preceding claims, characterized in that the sowing shoe (9) has a wear-resistant front edge (12).
  13. 13. Sowing coulter arrangement (1) according to one of the preceding claims, characterized in that the sowing shoe (9) has an internal channel into which a supply line (10) opens.
  14. 14. Seed drill with at least one sowing coulter arrangement (1), characterized in that the at least one sowing coulter arrangement (1) is designed according to one of the preceding claims.

Description

coulter arrangement The present invention relates to a sowing coulter arrangement according to the preamble of claim 1. Furthermore, a sowing machine according to claim 14 is the subject of the invention. A coulter arrangement of the type mentioned at the beginning is known from US 2015/0334915 A1. This discloses a coulter arrangement for a seed drill, which comprises a rocker arm on which a coulter disc rotating about a rotation axis for creating a seed furrow, a seed shoe pivotably mounted relative to the coulter disc about a pivot axis running essentially parallel to the coulter disc for spreading seed and/or fertilizer into the seed furrow, as well as a pressure roller and a closing roller are arranged. The rotating coulter disc is arranged on the rocker arm at an angle relative to the line of movement of the direction of travel in order to form a seed furrow in the soil surface. Due to the inclination of the coulter disc, it pushes the soil to the side and creates the seed furrow. The seed shoe is mounted next to the coulter disc in order to keep the generated seed furrow open and to enable the seed to be deposited in it before the loose soil falls back into the seed furrow. The seed shoe is positioned so that it runs in the shadow of the coulter disc to reduce wear on the seed shoe and to reduce disturbance of the soil around the seed furrow. The pivot axis is inclined upwards in relation to the ground in the direction of travel. The pivoting of the seed shoe around the pivot axis serves to clean or remove material that has accumulated between the seed shoe and the coulter disc. The disadvantage of this arrangement is that when the seed shoe is pivoted out for cleaning, a wedge forms between the seed shoe and the coulter disc that closes against the direction of travel and restricts the unhindered escape of the accumulating material. This leads to further accumulation of material, which leads to a larger pivoting movement or clogging. In addition to increased wear, the pivoting movement affects the quality of the seed placement in the seed furrow. Based on the above-mentioned prior art, the invention is based on the object of developing a sowing coulter arrangement of the type mentioned at the outset in such a way that the disadvantages known from the prior art are avoided. This object is achieved by a sowing coulter arrangement with the features of independent patent claim 1. Advantageous embodiments and further developments can be found in the dependent claims. According to claim 1, a sowing coulter arrangement for a sowing machine is proposed, which comprises a rocker arm on which a coulter disc rotating about a rotation axis for creating a sowing furrow and a sowing shoe arranged adjacent to the coulter disc for spreading seed and/or fertilizer into the sowing furrow are arranged, wherein the sowing shoe is pivotally mounted about a pivot axis arranged adjacent to the coulter disc. According to the invention, the pivot axis is oriented in the direction of travel at an angle of inclination downwards in the direction of the sowing furrow. The effect achieved by this is that the sowing shoe, with its lower edge facing the sowing furrow, delves deeper into the sowing furrow on its front edge pointing in the direction of travel than around the area of its rear edge. If material builds up between the coulter disc and the inside of the sowing shoe facing this, this leads to an evasive movement of the sowing shoe around the pivot axis. Swiveling the sowing shoe around the pivot axis inclined in the direction of travel means that when the sowing shoe makes an evasive movement in relation to the direction of travel, a wedge that lifts backwards and opens forms between the lower edge and the soil horizon. In the front transition between the front edge, which is designed as a wear edge, and the lower edge, the distance to the soil horizon when the sowing shoe makes an evasive movement is smaller than in the rear transition between the lower edge and the rear edge of the sowing shoe. Preferably, an end of the pivot axis facing the axis of rotation is arranged substantially at the same height as the axis of rotation. In particular, the angle of inclination of the pivot axis can be in the range between 5° and 35°. Particularly preferably, an angle of inclination is provided which is in the range between 15° and 25°. According to a preferred development, a surface of the coulter disc facing the seed shoe can enclose an opening angle with the pivot axis that opens when viewed in the direction of travel. The angle of attack of the swivel axis can be in the range between 0.5° and 5°. The angle of attack is particularly preferably in the range between 1° and 4°. Setting the angle of attack in the above-mentioned range results in a wedge opening in the opposite direction of travel between the seed shoe and the coulter disc. This wedge, which opens horizontally in the opposite direction of travel, i.e. to the rear, f