DE29719874U1 - Star wheel, in particular for star wheel rollers of separating devices - Google Patents

Description

Busse & Busse Patent Attorneys

European Patent and Trademark Attorneys

Dipl.-Ing. Dr. iur. V. Busse Franz Grimme Dipl.-Ing. Dietrich Busse

Landmaschinenfabrik GmbH & Co. KG gg;:];j; [j ⁸ , ⁰ / ¹ , ^ToTt

Wiesenstrasse 10

,_,_._» GroShandelsring S

49401 Damme D-49084 Osnabrück

PO Box 12 2 6

D-49002 Osnabruck

Telephone:0541-586081 Fax:0541-588164

07.11.97 DB/Ha

Star wheel, especially for star wheel rollers of separating devices

The invention relates to a star wheel, in particular for star wheel rollers of separating devices, in a design according to the preamble of claim 1.

Star wheels of this type (DE 295 16 309 LM) are mounted next to one another on a polygonal, in particular square, drive shaft to form a star wheel roller, with their hub parts touching one another flush. The adjacent star wheels are offset from one another at an angle, 90° in the case of a square drive shaft, so that the fingers of adjacent star wheels are offset from one another with a gap. The main application area for such star wheel rollers is separating devices in root crop harvesting machines and sorting devices.

The invention addresses the problem of reducing manufacturing costs and increasing the drive torque that can be transmitted from the drive shaft to the star wheels.

The invention solves the problem by means of a star wheel with the features of claim 1. With regard to essential further embodiments, reference is made to claims 2 to 7.

The star wheel according to the invention forms a one-piece star wheel unit composed of two conventional star wheels, within which the fingers have the same offset from one another as is the case with two conventional star wheels adjacent to one another on a drive shaft. Instead of two injection molding processes for two conventional star wheels, the star wheel according to the invention can be manufactured in a single injection molding process, which results in considerable cost savings. At the same time, the torque that can be transferred from the drive shaft to the star wheel without damage is doubled, so that even in the event of strong resistance, which for example large stones can exert on a star wheel, the otherwise normally occurring spinning of the drive shaft in the hub part can be avoided and proper operation can be ensured.

Further details and advantages emerge from the following description of an embodiment of the subject matter of the invention, which is illustrated in more detail in the drawing. In the drawing:

Fig. 1 is a side view of a star wheel according to the invention, Fig. 2 is a plan view of the star wheel according to Fig. 1, and Fig. 3 is a section along the line !U-II in Fig. 1.

The star wheel shown in the drawing forms a molded body made of plastic, rubber or similar material and comprises a hub part 1, which has a central through-opening 2 for a drive shaft, in the case of the present

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The star wheel also comprises a number of flexible fingers 3, 4 which protrude approximately in a star shape from the hub part 1 and which are essentially rectangular in cross-sections perpendicular to their longitudinal center plane, decrease in thickness from the hub part 1 to the finger ends and have longitudinal center planes with an arched curve.

The fingers 3 form a first group of fingers that border on an end face 5 of the hub part 1, are aligned one behind the other in the circumferential direction and take up part of the axial width of the hub part 1. The fingers 4 form a second group of fingers that border on the opposite end face 6 of the hub part 1, are also aligned one behind the other in the circumferential direction and also extend over part of the axial width of the hub part 1. The fingers 3 of the first group are offset in the circumferential direction centrally to the gap between the fingers 4 of the second group, as shown in Figs. 1 and 2.

The fingers 3, 4 of both groups protrude slightly axially over the radial center plane 7 of the star wheel with their side edges facing each other, so that they overlap each other slightly in the axial direction. The fingers 3, 4 of both groups also protrude slightly axially over the end faces 5, 6 of the hub part 1 with their side edges facing away from each other, so that when star wheels according to the invention are arranged axially next to each other on a drive shaft, the fingers 3, 4 also have a corresponding overlap in the transition area between adjacent star wheels.

The overhangs are preferably in the range of 10 to 20% of the finger width, which is usually between 15 and 75 mm depending on the intended use.

At their ends, the fingers 3,4 have a bead-like thickening 9 towards the front side in the direction of rotation 8, which counteracts wear and increases the driving effect of the fingers 3,4. The driving effect is also increased by bead-like thickenings 10 on the fingers 3,4, which form a transverse rib parallel to the axis and are arranged in the area of the outer half of the fingers 3,4.

Claims (7)

.··.."- .: .: .··.·»· _{Buses &} Buses Patent attorneys European Patent and Trademark Attorneys Dipl.-lng. Dr. iur. V. Busse Franz Grimme Dipl.-lng. Dietrich Busse Landmaschinenfabrik GmbH & Co. KG ™%^ ^ ₁ ⁰ / ¹ , _c ^Bu _h ^ne _p ^m ₀ 7 _t Wiesenstrasse 10 ift4ftH n»-.— Wholesale Ring 6 49401 Damme D-49084 Osnabrück POS box 1226 D-49002 Osnabruck Telephone:0541-586081 Fax:0541-588 1 64 07.11.97 DB/Ha Expectations: 1. Star wheel, in particular for star wheel rollers of separating devices, consisting of a molded body made of plastic or the like with a hub part (1) which has a central through opening (2) for a drive shaft, and with a number of flexible fingers (3, 4) projecting approximately in a star shape from the hub part (1), characterized in that the hub part (1) carries two axially adjacent groups of fingers (3, 4) and the fingers (3) of the first group are arranged offset from the fingers (4) of the second group. 2. Star wheel according to claim 1, characterized in that the fingers (3, 4) of both groups with their mutually facing side edges alternately project slightly axially beyond the radial center plane (7) of the star wheel. 3. Star wheel according to one of claims 1 or 2, characterized in that the fingers (3, 4) of both groups with their side edges facing away from each other each protrude slightly axially beyond the end faces (5, 6) of the hub part (1). 4. Star wheel according to one of claims 2 or 3, characterized in that the projections amount to 10-20% of the finger width. 5. Star wheel according to one of claims 1 to 4, characterized in that the fingers (3, 4) are delimited at right angles in cross sections perpendicular to their longitudinal center plane, the thickness of the fingers (3, 4) decreases from the hub part (1) to the finger ends and the longitudinal center plane of the fingers (3, 4) has an arcuate concave curve in the direction of rotation (8). 6. Star wheel according to one of claims 1 to 5, characterized in that the fingers (3, 4) have a bead-like thickening (9) at their ends towards the front. 7. Star wheel according to one of claims 1 to 6, characterized in that the fingers (3, 4) are provided in the region of their outer half on their front side with a bead-like thickening (10) forming a transverse rib.