AU2019235398B2

AU2019235398B2 - Holding assembly of an excavator tooth, having a holder, for arranging on the bucket of a bucket-wheel excavator

Info

Publication number: AU2019235398B2
Application number: AU2019235398A
Authority: AU
Inventors: Michael Busch; Edeltraud BUTTERBACH; Tomasz Kwiatkowski; Viktor Raaz
Original assignee: Koch Solutions GmbH
Current assignee: Koch Solutions GmbH
Priority date: 2018-03-14
Filing date: 2019-03-14
Publication date: 2022-08-04
Anticipated expiration: 2039-03-14
Also published as: DE102018203913A1; CN111836936B; EP3765679A1; AU2019235398A1; WO2019175303A1; EP3765679B1; CN111836936A

Abstract

The invention relates to a holding assembly (1) of an excavator tooth (10), having a holder (2), for arranging on the bucket of a bucket-wheel excavator, the excavator tooth (10) having a tooth head (11) and a holding shaft (12) that adjoins the tooth head (11), and the holder (2) having a holder opening (13) for receiving the holding shaft (12). According to the invention, the holder (2) has a U-shaped holder body (14), which is arranged on a bucket blade contact surface (26) of a bucket blade (22) of a bucket, the holder body (14) having two contact surfaces (16), which are spaced apart from each other and inclined with respect to each other, and the contact surfaces (16) and the bucket blade contact surface (26) forming a triangular arrangement with respect to each other. The invention further relates to an excavator tooth (10), to a holder body (14), to a contact plate (15) and to a method for forming a holding assembly (1) of this type.

Description

RECEIVING ASSEMBLY OF AN EXCAVATOR TOOTH, HAVING A RECEIVER, FOR ARRANGING ON THE BUCKET OF A BUCKET-WHEEL EXCAVATOR

FIELD OF THE INVENTION The present invention relates to a receiving assembly of an excavator tooth, having a receiver, for arranging on a bucket blade of a bucket of a bucket-wheel excavator, wherein the excavator tooth comprises a tooth head and a receiving shaft adjoining the tooth head, and wherein the receiver comprises a receiving opening for receiving the receiving shaft.

BACKGROUND OF THE INVENTION Patent document EP 0 584 101 B1 discloses byway of example a receiving assembly of an excavator tooth, having a receiver, for arranging on the bucket of a bucket wheel excavator. The excavator tooth comprises a tooth head and a receiving shaft receiving shaft adjoining the tooth head, wherein the receiver has a receiving opening receiving opening for holding the holding shaft. If the receiving shaft is introduced into the receiving opening, a securing element serves to prevent the receiving shaft from being released again from the receiving opening.

Patent document DE 34 44 563 Al describes a related-type receiving assembly of an excavator tooth.

The excavator teeth of a bucket-wheel excavator are subject to a high degree of wear and must therefore, depending on use, be changed often and in short production interruption times. To change the excavator tooth, the defective or worn excavator tooth must be released from the receiver and a new excavator tooth must be inserted into the receiver. Typical tooth fastening systems for bucket-wheel excavators which allow the worn tooth to be exchanged within the shortest possible time generally consist of three main components. Firstly, these are the excavator tooth, further the receiver with the receiving opening and finally the securing element, which can be configured as an elastic securing element or for example as a wedge, which securing element or wedge can optionally also additionally be counter-secured again, for example using a wrapped-around wire. Here, the excavator tooth and the receiver are

18856738_1 (GHMatters) P114230.AU as a rule simply wedged in the supporting region and are secured in a gap-free manner with the aid of the securing element only in their tooth longitudinal axis. The receiver for its part is generally non-releasably fastened to the bucket of the bucket wheel excavator, for example by a welding seam which non-releasably connects the receiver to a bucket blade.

Besides the actual digging forces which act on the excavator tooth, alternating lateral digging forces frequently act on the excavator tooth in addition. Given the frequent absence of lateral fixing of the excavator teeth, the situation increasingly arises in which the excavator teeth are knocked laterally out of the receiver, thereby further increasing the failure risk of the bucket-wheel excavator.

Although the very small wedge angles of the receiving opening in the receiver that are based on self-locking lead to the improved absorption of forces, in particular of lateral digging forces, there nevertheless also results an increase in the manufacturing efforts required to form the receiving opening in the receiver, since they have to be manufactured more precisely in the case of small wedge angles. Particularly when not only the digging forces in the main digging direction act on the excavator teeth, but additionally when lateral digging forces with higher force peaks act on the excavator teeth, a plurality of contact surfaces to be machined with respect to one another are required in the receiver and have to correspond to correspondingly machined contact surfaces on the receiving shaft of the excavator tooth. Particularly when the tooth must not of itself "work in" deeper into the receiving opening of the receiver so as to continue to ensure that the excavator tooth can be quickly removed from the receiver in situ, very tight tolerances frequently have to be observed.

It would be advantageous to devise a receiving assembly of an excavator tooth in a receiver for arranging a bucket of a bucket-wheel excavator, wherein the receiving assembly is intended to comprise a simple configuration, and wherein the excavator tooth should be able to withstand alternating loads. In addition, the excavator tooth should be able to be exchanged in the receiver in a simple manner.

SUMMARY OF THE INVENTION The invention includes the technical teaching that the receiver comprises a U-shaped receiving body which is arranged on a bucket blade contact surface of a bucket blade

18856738_1 (GHMatters) P114230.AU of a bucket, wherein the receiving body has two spaced-apart contact surfaces formed at an inclination to one another, wherein the contact surfaces and the bucket blade contact surface form a triangular arrangement with respect to one another.

The development according to the invention of the receiving assembly allows an excavator tooth to be held in such a way that the excavator tooth can absorb both the main digging forces and lateral digging forces and transfer them into the receiver of the receiving assembly without the possibility occurring of premature loosening of the excavator tooth in the receiver. The contact surfaces, which are oriented in a triangular arrangement with respect to one another, allow force transfer from the receiving shaft of the excavator tooth into the receiving opening of the receiver, wherein the force transfer is advantageously possible both in the main digging direction and additionally in the lateral direction without the contact surfaces having to be produced with large manufacturing effort and having to be dimensioned with respect to one another.

In particular, there is provision that the triangular arrangement comprises an end surface, which is arranged opposite to the bucket blade contact surface, in the manner of a roof surface, wherein the end surface is arranged in such a way that the triangular arrangement comprises/forms a trapezoidal geometry. This provides an advantageous geometric arrangement. The roof surface is preferably contact-free, that is to say without a supporting function with respect to the excavator tooth.

In particular, there is provision that the receiving body defines at least five surfaces comprising the two contact surfaces formed at an inclination to one another, wherein the two contact surfaces formed at an inclination to one another are arranged at second and fourth positions and, together with the bucket blade contact surface, form the triangular arrangement. This provides an advantageous geometric arrangement. The surfaces between the contact surfaces are preferably contact-free lateral surfaces, that is to say without a supporting function with respect to the excavator tooth. These lateral surfaces are arranged between the two contact surfaces formed at an inclination to one another and the bucket blade contact surface.

In particular, there is provision that the two contact surfaces formed at an inclination to one another are each arranged between opposite receiving shaft surfaces and

18856738_1 (GHMatters) P114230.AU between an end surface arranged opposite to the bucket blade contact surface. This provides an advantageous geometric arrangement. The end surface is preferably contact-free, that is to say without a supporting function with respect to the excavator tooth.

In particular, there is provision that the triangular arrangement comprises in cross section the geometry of a capped, flattened-off roof, or comprises a trapezoidal geometry. This provides an advantageous geometric arrangement.

In particular, there is provision that the two contact surfaces formed at an inclination to one another are enclosed by opposite receiving shaft surfaces and an end surface arranged opposite to the bucket blade contact surface, wherein the proportion of contact-free surfaces in the receiving assembly with respect to the proportion of the excavator tooth-contacting surfaces (16) is at least 50%, preferably at least 75%, and is particularly preferably greater than or equal to the total contact surfaces.

The cross-sectional lengths of the contact surfaces can here be at least 50% or at least 75% of the cross-sectional length of the end surface. This also provides an advantageous geometric arrangement. In particular, there is provision that the cross sectional lengths of the contact surfaces are at least 25% or at least 50% of the cross sectional length of the receiving shaft surfaces.

In particular, there is provision that the two contact surfaces formed at an inclination to one another enclose, with opposite receiving shaft surfaces, in each case an angle in the range from 110° to 160°, preferably 120° to 150°, further preferably 125 to 145°. This provides an advantageous geometric arrangement.

In particular, there is provision that the two contact surfaces formed at an inclination to one another enclose, with a/the end surface arranged opposite to the bucket blade contact surface, in each case an angle in the range from 110 to 160°, preferably 120° to 150°, further preferably 125 to 145°. This provides an advantageous geometric arrangement.

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It is possible here for the respective receiving shaft surface to be arranged at least approximately orthogonally to the bucket blade contact surface, in particular exactly orthogonally.

In particular, in accordance with the invention the receiver comprises the U-shaped receiving body and a contact plate, wherein the receiving body comprises the two spaced-apart contact surfaces formed at an inclination to one another, and the contact plate comprises a further contact surface, and wherein the three contact surfaces form a triangular arrangement with respect to one another.

The contour of the contact surface of the contact plate correlates with the contour of the bucket blade contact surface of the bucket blade. This makes it possible that the contact plate can lie, or can be arranged, on the bucket blade contact surface in a gap-free manner. Here, gap-free means that there are no clearances between the surfaces, with the result that optimum force transmission can occur.

The contact surfaces which are produced internally in the receiving opening of the receiving body can be milled in a simple manner, and the contact plate can comprise a contact surface which the contact plate, already in the state of a semifinished product, comprises. The contact plate need then only be brought to the desired size, and the contact plate can be arranged on the U-shaped receiving body in such a way that the two contact surfaces in the receiving opening of the contact body and the contact surface on the contact plate form a triangular arrangement with respect to one another and form a corresponding position tolerance with respect to one another. The three surfaces do not have to intersect here, and the three surfaces can be delimited in such a way that they are formed spaced apart from one another. Here, the triangular arrangement arises only through the orientation of the contact surfaces with respect to one another, for example in that the two contact surfaces in the receiving body are formed as roof surfaces and form legs, with the result that the contact surface on the contact plate forms a hypotenuse which can be regarded as a base surface, with the result that the two contact surfaces in the receiving body extend in a roof-like manner above the contact surface on the contact plate.

With particular advantage, the bucket blade contact surface or the contact plate is arranged on the receiving body in such a way that an opening side of the U shape of

18856738_1 (GHMatters) P114230.AU the receiving body is at least partially closed by the bucket blade contact surface or the contact plate. The inner wall of the receiving opening in the receiving body and the contact plate here form a closed inner contour for holding the receiving shaft of the excavator tooth. The advantage of the initially separate contact plate lies in the fact that it can be mounted on the receiving body using a reference body in the form of the receiving shaft of the excavator tooth, with the result that an accurate receiving opening which maintains tight tolerances can be formed in a simple manner, in particular if the reference body has the exact shape of the receiving shaft. It is thereby also possible for small wedge angles of the receiving opening to be implemented without the machining of the internal contact surfaces giving rise to particular effort in terms of manufacture even with a slender, deep receiving opening as a result of a small wedge angle.

The receiving opening comprises an opening longitudinal axis along which the receiving shaft can be introduced into the receiving opening. Here, the contact surfaces of the receiving body and the contact surface of the contact plate or the bucket blade contact surface can point toward the opening longitudinal axis. The two contact surfaces at an inclination to one another which form a part of the inner contour of the receiving opening do not have to intersect in a common edge, and a further roof surface can be provided above the contact plate such that the cross-sectional shape of the receiving opening approximately forms a trapezoid.

Furthermore, the receiving body comprises a mouth side in which the excavator tooth can be introduced to arrange the receiving shaft in the receiver. Here, the contact surfaces can taper toward one another with increasing distance from the mouth side along the opening longitudinal axis of the receiving opening, with the result that they can form the surfaces of a three-sided pyramid or can form, in cross section, a quadrangular trapezoid, in particular a quadrangle with a flat upper side. Consequently, the cross-sectional area of the trapezoidal shape of the receiving opening above the contact plate becomes smaller with increasing distance from the mouth side of the receiver.

With particular advantage, the contact plate is welded onto the receiving body and/or onto the bucket blade. Furthermore, the receiving body can comprise welding bevels which are formed on the outer side on the edges and via which the receiving body can

18856738_1 (GHMatters) P114230.AU be welded onto the bucket of a bucket-wheel excavator. In particular, the contact plate can thus first be welded onto the receiving body so as to then weld the assembly consisting of the receiving body and the contact plate onto the bucket of the bucket wheel excavator, in particular onto a bucket blade.

The two spaced-apart contact surfaces formed at an inclination to one another on the receiving body can be machined. Furthermore, a receiving groove can be machined on the respective limbs of the U-shaped receiving body for welding on the contact plate in order to allow exact positioning of the contact plate on the contact body particularly using the reference body in the form of the receiving shaft.

In particular, the two contact surfaces formed at an inclination to one another can each be arranged between opposite receiving shaft surfaces and between an end surface arranged opposite to the bucket blade contact surface. This provides an advantageous geometric arrangement.

In particular, the two contact surfaces formed at an inclination to one another can be arranged, with opposite receiving shaft surfaces, in each case at an angle in the range from 125 to 145°. This provides an advantageous geometric arrangement.

In particular, the two contact surfaces formed at an inclination to one another can be arranged, with a/the end surface arranged opposite to the bucket blade contact surface, in each case at an angle in the range from 125 to 145°. This provides an advantageous geometric arrangement.

The invention is furthermore directed at a method for forming a receiving assembly of an excavator tooth, having a receiver, for arranging on a bucket blade of a bucket of a bucket-wheel excavator, wherein the excavator tooth comprises a tooth head and a receiving shaft adjoining the tooth head, and wherein the receiver comprises a receiving opening for receiving the receiving shaft, and wherein a bucket comprises a bucket blade with a bucket blade contact surface. The method according to the invention here provides the following steps: creating two spaced-apart contact surfaces formed at an inclination to one another in a receiving opening inner region of the U-shaped receiving body, arranging the receiving body on the bucket blade contact surface, with the result that an opening side of the U shape of the receiving

18856738_1 (GHMatters) P114230.AU body is at least partially closed by the bucket blade contact surface and the three contact surfaces form a triangular arrangement with respect to one another.

A preferred measure of the invention is characterized by providing a contact plate having a further contact surface on the bucket blade contact surface, and arranging the contact plate on the receiving body, with the result that an opening side of the U shape of the receiving body is at least partially closed by the contact plate and the three contact surfaces form a triangular arrangement with respect to one another.

The contour of the contact surface of the contact plate preferably correlates with the contour of the bucket blade contact surface of the bucket blade. This makes it possible by way of example that the contact plate can lie or can be arranged on the bucket blade contact surface in a gap-free manner.

With particular advantage, the contact plate can be welded onto the receiving body, wherein, to position the contact plate onto the receiving body, a reference body in the form of the receiving shaft can be inserted into the receiving opening. This makes it possible to create an exact, tightly tolerant receiving opening in the receiver in which the receiving shaft of the excavator tooth can be held in a play-free manner. The initially open accessibility of the inner region of the receiving body means that the contact surfaces can be machined, and only then is the contact plate welded onto the free ends of the limbs of the U-shaped receiving body. Finally, as a last step, the assembly consisting of the receiving body and the contact plate can be mounted, in particular welded, onto the bucket of the bucket-wheel excavator.

Further measures which improve the invention will be illustrated in more detail below in conjunction with the description of a preferred exemplary embodiment of the invention with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 shows a side view of a preferred embodiment of a receiving assembly with an excavator tooth which is arranged in a receiver, wherein the receiving body of the receiver is illustrated in partially sectioned form,

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Figure 2 shows a cross-sectional view of the receiving assembly according to figure 1,

Figure 3 shows a rear view of the receiving shaft of the excavator tooth,

Figure 4 shows a perspective view of the excavator tooth with the tooth head and the receiving shaft adjoining the tooth head on the rear side, and

Figure 5 shows a perspective view of the receiving assembly with the excavator tooth arranged in the receiver.

DESCRIPTION OF EMBODIMENTS OF THE INVENTION Figure 1 is a side view showing a preferred embodiment of a receiving assembly 1 with an excavator tooth 10 and with a receiver 2 for arranging on the bucket of a bucket-wheel excavator. The excavator tooth 10 comprises a tooth head 11 which, during use of the bucket-wheel excavator, is brought into contact with the material to be removed, and the excavator tooth 10 comprises a receiving shaft 12 which adjoins the tooth head 11 on the rear side and which is introduced into a receiving opening 13 of the receiver 2.

The receiver 2 has as essential component a receiving body 14 which comprises a U shaped basic shape. The receiving opening 13 is formed in the inner region of the U shape of the receiving body 14, and the opening side of the U shape of the receiving body 14 is closed by a contact plate 15. Here, the contact plate 15 is arranged on a bucket blade contact surface 26 of a bucket blade 22 of a bucket. Consequently, the opening side of the U shape of the receiving body 14 is arranged with a contact plate 15 on the bucket blade contact surface 26.

This particularly comes down to the fact that the contour of the contact surface 17 of the contact plate 15 correlates with the contour of the bucket blade contact surface 26 of the bucket blade. This makes it possible that the contact plate 15 lies on the bucket blade contact surface 26 in a gap-free manner.

The receiving opening 13 is of wedge-shaped configuration and comprises a mouth side 19 with a large cross section which becomes continuously smaller with

18856738_1 (GHMatters) P114230.AU increasing distance from the mouth side 19. On the rear side, the receiving shaft 12 is secured in the receiving opening 13 by a securing element 25.

Figure 2 shows a view of a cross section through the arrangement of the receiving shaft 12 in the receiving body 14 of the receiver 2. The inner region of the receiving body 14 comprises two spaced-apart contact surfaces 16 formed at an inclination to one another which extend above the contact plate 15 as a two-sided roof. The contact plate 15 has a further contact surface 17, and the cross-sectional view shows that the three contact surfaces 16, 17 thus form a triangular arrangement with respect to one another. Here, all the contact surfaces 16, 17 point toward an opening longitudinal axis 18. Furthermore, the contact surfaces 16 and the bucket blade contact surface 26 also form a triangular arrangement with respect to one another.

If the receiving shaft 12 is introduced into the receiving opening 13, corresponding surfaces on the receiving shaft 12 come into contact with the contact surfaces 16, 17. Here, the cross-sectional view illustrates that forces can be applied to the receiving shaft 12 from each direction transversely to the opening longitudinal axis 18 and can be transferred into the receiver 2. Particularly by virtue of the fact that the receiving body 14 can be welded onto a bucket blade 22, for example by means of the lateral welding seams 24, loading can also occur in the direction of the contact plate 15, which in particular lies flat against a holding side of the bucket blade 22. The welding seams 23 for fastening the contact plate 15 to the receiving body 14 serve here only for the formation of a closed contour of the receiving opening 13 with correspondingly tight tolerances, and forces which act from the receiving shaft 12 in the direction of the contact plate 15 can be directly transferred into the flexurally rigidly configured bucket blade 22.

Figure 2 further describes a receiving shaft surface 12.1 and an end surface 12.2 which can each contribute to forming the triangular arrangement.

The upper side of the excavator tooth is preferably supported exclusively by means of the two contact surfaces 16. Expressed in other terms: the further upper and lateral surfaces can (apart from the lower surface 17) remain contact-free.

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The two opposite receiving shaft surfaces 12.1 and the end surface 12.2 are each contact-free. Accordingly, the proportion of the contact-free surfaces in the receiving assembly with respect to the proportion of the contacting surfaces (16) can be at least 50%, preferably at least 75%, and particularly preferably be greater than or equal to the total contact surfaces.

Figure 3 shows a rear view of the excavator tooth 10 with the tooth head and with the receiving shaft 12. Arranged on the receiving shaft 12 are the contact countersurfaces 16' and 17' which correspond with the arrangement of the contact surfaces 16 and 17 of the receiving assembly 1.

Figure 4 is a perspective view showing the excavator tooth 10 with the contact countersurfaces 16' and 17' which partially contour the receiving shaft 12, and the cross section of the receiving shaft 12 tapers with increasing distance from the tooth head 11.

Figure 5 is a further perspective view showing the arrangement of the excavator tooth 10 with the tooth head 11 and with the receiving shaft 12 in the receiver 2. On the rear side, the receiving shaft 12 is secured by a securing element 25 to counter extraction of the excavator tooth 10 from the receiver 2.

The receiving body 14 of the receiver 2 laterally comprises welding bevels 20 and 21 via which the receiving body 14 can be welded onto the bucket blade 22, as illustrated in figure 2. A first welding bevel 20 is configured to be larger and allows a welding seam for arranging on the bucket blade 22 having a larger cross section for absorbing larger forces, and at the rear side there adjoins a smaller welding bevel 21 on the receiving body 14 that allows a smaller welding seam since, with increasing distance from the tooth head 11, the forces transmitted from the receiving body 14 to the bucket blade 22 become smaller.

The invention is not restricted in its implementation to the preferred exemplary embodiment specified above. Rather, a number of variants which make use of the illustrated solution even in implementations of a fundamentally different nature are conceivable. All of the features and/or advantages, including design details or spatial

18856738_1 (GHMatters) P114230.AU arrangements, which emerge from the claims, the description or the drawings may be essential to the invention both by themselves and in a wide variety of combinations.

It is to be understood that, if any prior art publication is referred to herein, such reference does not constitute an admission that the publication forms a part of the common general knowledge in the art, in Australia or any other country.

In the claims which follow and in the preceding description of the invention, except where the context requires otherwise due to express language or necessary implication, the word "comprise" or variations such as "comprises" or "comprising" is used in an inclusive sense, i.e. to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments of the invention.

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List of reference signs

1 Receiving assembly 2 Receiver

10 Excavator tooth 11 Tooth head 12 Receiving shaft 12.1 Receiving shaft surface (in particular contact-free lateral surface) 12.2 End surface (in particular contact-free end surface) 13 Receiving opening 14 receiving body 15 Contact plate 16 inclined Contact surfaces 16' Contact countersurface 17 Contact surface 17' Counter countersurface 18 Opening longitudinal axis 19 Mouth side 20 Welding bevel 21 Welding bevel 22 Bucket blade 23 Welding seam 24 Welding seam 25 Securing element 26 Bucket blade contact surface

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Claims

Patent claims

1. A receiving assembly for securing of an excavator tooth to a bucket blade of a bucket of a bucket-wheel excavator, wherein the excavator tooth comprises a tooth head and a receiving shaft adjoining the tooth head, wherein the receiving assembly comprises a receiver having a U-shaped receiving body with a receiving opening for receiving the receiving shaft of the excavator tooth, the U-shaped receiving body configured for fastening through welding of opposing limbs of the U-shaped receiving body on to a bucket blade contact surface of the bucket blade, wherein the receiving body comprises two internal, spaced-apart contact surfaces formed at an inclination to one another, wherein the contact surfaces and the bucket blade contact surface form a triangular arrangement with respect to one another, wherein the receiver further has a contact plate welded to the receiving body between its opposing limbs such that an otherwise open side of the U shaped receiving body is at least partially closed by the contact plate, the contact plate providing a further contact surface which together with the two inclined contact surfaces form a triangular arrangement with respect to one another and against which corresponding countersurfaces of the receiving shaft come into contact when the receiving shaft is received in the receiving body, and wherein a contour of the contact surface of the contact plate correlates with a contour of the bucket blade contact surface on which the contact plate lies in a gap-free manner.

2. The receiving assembly as claimed in claim 1, wherein the receiving body further comprises an end surface which is arranged opposite to the bucket blade contact surface in the manner of a roof surface spanning the two inclined contact surfaces in such a way that the triangular arrangement of contact surfaces forms a trapezoidal geometry.

3. The receiving assembly as claimed in claim 1 or 2, wherein the receiving body defines at least five surfaces comprising the two contact surfaces formed at an inclination to one another, wherein the two contact surfaces formed at an inclination to one another are arranged at second and fourth positions and, together with the bucket blade contact surface, form the triangular arrangement.

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4. The receiving assembly as claimed in any one of the preceding claims, wherein the two contact surfaces formed at an inclination to one another are each arranged between opposite receiving shaft surfaces and between an/the end surface arranged opposite to the bucket blade contact surface.

5. The receiving assembly as claimed in any one of the preceding claims, wherein the triangular arrangement of contact surfaces comprises in cross section the geometry of a capped, flattened-off roof, or comprises a trapezoidal geometry.

6. The receiving assembly as claimed in any one of the preceding claims, wherein the two contact surfaces formed at an inclination to one another are enclosed by opposite receiving shaft surfaces and an/the end surface arranged opposite to the bucket blade contact surface, wherein the proportion of contact-free surfaces in the receiving assembly in relation to the proportion of the excavator tooth-contacting surfaces is at least 50%.

7. The receiving assembly of claim 6, wherein the proportion of contact-free surfaces in the receiving assembly in relation to the proportion of the excavator tooth contacting surfaces is at least 75%, or wherein the proportion of contact-free surfaces in the receiving assembly in relation to the proportion of the excavator tooth contacting surfaces is greater than or equal to the total contact surfaces.

8. The receiving assembly as claimed in any one of the preceding claims, wherein the two contact surfaces formed at an inclination to one another enclose, with respectively adjoining opposite receiving shaft surfaces, in each case an angle in the range from 110° to 160°, or in the range of 120° to 150°, or in the range of 125 to 145°; and/or wherein the two contact surfaces formed at an inclination to one another enclose, with a/the end surface arranged opposite to the bucket blade contact surface, in each case an angle in the range from 110° to 160°, or in the range of 120° to 150°, or in the range of 125 to 145°; and/or wherein the receiving shaft surfaces are arranged at least approximately orthogonally to the bucket blade contact surface.

9. The receiving assembly as claimed in any one of the preceding claims, wherein the receiving opening has an opening longitudinal axis along which the receiving shaft of the excavator tooth can be introduced into the receiving opening,

18856738_1 (GHMatters) P114230.AU wherein the two receiving body contact surfaces formed at an inclination to one another and the contact surface of the contact plate and the bucket blade contact surface point toward the opening longitudinal axis; and/or wherein the receiving body comprises a mouth side via which the excavator tooth can be inserted to arrange the receiving shaft in the receiver, wherein the two receiving body contact surfaces formed at an inclination to one another and the contact surface of the contact plate taper toward one another with increasing distance from the mouth side along a/the longitudinal axis of the receiving opening in such a way that they form the surfaces of a three-sided pyramid or form in cross section a quadrangular trapezoid, in particular a quadrangle with a flat upper side.

10. A method for forming a receiving assembly for an excavator tooth at a bucket blade of a bucket of a bucket-wheel excavator, wherein the excavator tooth comprises a tooth head and a receiving shaft adjoining the tooth head, wherein the receiving assembly comprises a receiver having a receiving body with an opening for receiving the receiving shaft of the excavator tooth, and wherein the bucket blade has a bucket blade contact surface, the method comprising at least the following steps: - creating a U-shaped receiving body with two spaced-apart contact surfaces formed at an inclination to one another in an inner region of the U-shaped receiving body that delimits the receiving opening, - providing a contact plate and welding it between opposing limbs of the U-shaped body such as to close an otherwise open side of the U shaped receiving body at least partially, the contact plate having a further contact surface which together with the two inclined contact surfaces of the U-shaped receiving body form a triangular arrangement with respect to one another, and - arranging the receiving body with the contact plate lying gap-free on the bucket blade contact surface and welding the opposing limbs of the U-shaped receiving body on to the bucket blade contact surface, - wherein the two inclined contact surfaces and the contact plate surface form a triangular arrangement with respect to one another and against which corresponding countersurfaces of the receiving shaft come into contact when the receiving shaft is received in the receiving body.

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11. The method as claimed in claim 10, wherein to position the contact plate on the receiving body, a reference body having the shape of the receiving shaft is inserted into the receiving opening of the receiving body.

12. The method as claimed in claim 10 or 11, wherein the two contact surfaces formed at an inclination to one another are each arranged between opposite receiving shaft surfaces and between an end surface arranged opposite to the bucket blade contact surface.

13. The method as claimed in any one of claims 10 to 12, wherein the two contact surfaces formed at an inclination to one another are arranged, with opposite receiving shaft surfaces, in each case at an angle in the range from 125 to 145°; and/or wherein the two contact surfaces formed at an inclination to one another are arranged with an/the end surface arranged opposite to the bucket blade contact surface, in each case at an angle in the range of 125 to 145°.

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