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CN-122013845-A - Tooth tip group for earthmoving machine

CN122013845ACN 122013845 ACN122013845 ACN 122013845ACN-122013845-A

Abstract

A tooth tip set (1) for an earth moving machine, extending mainly along a longitudinal axis (X) between a front working part (2) and a rear part (4) for fastening to a bucket of the earth moving machine, and comprising a tooth tip (6) defining a pocket (8) open at the rear, a tooth tip holder (10) having a nose piece (12) defining a front projection (13), said nose piece being adapted to geometrically couple with the pocket so as to form a male-female coupling. The tooth tip set is characterized in that at least one of the inner surface of the pocket and the nose piece has at least one depression or recessed area (15, 15 ') extending at least partially in a direction intersecting the longitudinal axis, and at least the other of the inner surface of the pocket and the nose piece has at least one protrusion (16, 16') adapted to engage said depression or recessed area such that the tooth tip and the tooth tip holder are integrally coupled after said engagement.

Inventors

  • Francesco Belotti

Assignees

  • 爱斯提有限公司

Dates

Publication Date
20260512
Application Date
20251111
Priority Date
20241112

Claims (16)

  1. 1. A set of teeth (1) for an earthmoving machine, the set of teeth (1) extending mainly along a longitudinal axis (X) between a front working portion (2) and a rear portion (4) of a bucket to be fixed to the earthmoving machine, and comprising: -a tooth tip (6) defining a pocket (8) open at the rear; -a tooth tip holder (10) having a nose (12) defining a front projection (13), said nose (12) being adapted to geometrically couple to said pocket (8) to form a male-female coupling; Characterized in that at least one of the inner surface of the pocket (8) and the nose (12) has at least one depression or recessed region (15, 15 ') extending at least partially in a direction intersecting the longitudinal axis (X), and at least the other of the inner surface of the pocket (8) and the nose (12) has at least one projection (16, 16 ') adapted to engage the depression or recessed region (15, 15 '), such that after said engagement the tooth tip (6) and the tooth tip holder (10) are integrally coupled.
  2. 2. The tooth tip set according to claim 1, wherein a restraining reaction force generated by an integral coupling between the tooth tip (6) and the tooth tip holder (10) balances the influence of gravity acting on the tooth tip (6) when the tooth tip set (1) is in a vertical position with respect to the ground.
  3. 3. The tooth tip set according to any of the preceding claims, wherein the integrated coupling between the tooth tip (6) and the tooth tip holder (10) is achieved by axially engaging the tooth tip (6) in the tooth tip holder (10) and then rotationally moving the tooth tip (6) about the longitudinal axis (X).
  4. 4. The set of teeth according to any of the preceding claims, wherein the integral coupling between the teeth (6) and the teeth holder (10) is a bayonet coupling.
  5. 5. The set of teeth according to any one of the preceding claims, wherein both the inner surface of the pocket (8) and the nose (12) have a depression or recessed area (15, 15 '), each depression or recessed area (15, 15 ') extending at least partially in a direction intersecting the longitudinal axis (X), and both the inner surface of the pocket (8) and the nose (12) have a protrusion (16, 16 '), each protrusion (16, 16 ') being adapted to engage a respective one of the depression or recessed areas (15, 15 ').
  6. 6. The set of teeth according to any of the preceding claims, wherein the at least one depression or recessed area (15, 15') consists of a groove having a dimension in a direction parallel to the longitudinal axis (X) that is much smaller than a dimension in a direction intersecting the longitudinal axis (X).
  7. 7. The tooth tip set as claimed in any one of the preceding claims, wherein the tooth tip (6) has at least one locking element aperture (18) formed in a pair of opposing walls (20, 20 ') defining the pocket (8) and adapted to engage with a locking element (22; 23, 23 '), and wherein a locking element seat (24) is formed in the nose piece (12) adapted to engage with the locking element (22; 23, 23 '), the locking element seat (24) being at least partially aligned with the locking element aperture (18) when the tooth tip (6) and the tooth tip holder (10) are integrally coupled.
  8. 8. The set of teeth as claimed in claim 7, wherein the locking element seat (24) is defined by a depression or recessed area (14) formed in a surface of the nose piece (12).
  9. 9. The tooth tip set of claim 7 or 8, wherein the locking element bore (18) and the locking element seat (24) extend along a transverse axis (Y) perpendicular to the longitudinal axis (X).
  10. 10. The tooth tip set of any one of claims 7 to 9, wherein the nose piece (12) and the pocket (8) have upper (26, 26 ') and lower (28, 28 ') surfaces, respectively, inclined with respect to the longitudinal axis (X) and converging at the front, and wherein the nose piece (12) and the pocket (8) have opposite side surfaces (30, 30', 30", 30 '") respectively, at least the opposite side surfaces (30 ", 30 '") of the pocket (8) being substantially vertical.
  11. 11. The tooth point set of claim 10, the locking element seat (24) and the locking element bore (18) extending between the opposite side surfaces (30, 30', 30", 30'").
  12. 12. The tooth tip set according to any of the preceding claims, wherein the pocket (8) terminates at a front with a substantially hemispherical bottom (32) and the front projection (13) defined by the nose (12) is substantially hemispherical such that the front projection (13) rests on the bottom (32) when the tooth tip (6) is integrally coupled with the tooth tip holder (10).
  13. 13. The tooth point set of any one of claims 7 to 12, further comprising a locking pin (22), the locking pin (22) extending primarily along a pin axis (Z) and being adapted to engage the locking element seat (24) and the locking element aperture (18).
  14. 14. The tooth point set of claim 13, wherein the locking pin (22) has an intermediate portion (34) in a direction perpendicular to the pin axis (Z), the intermediate portion (34) being adapted to allow compressive insertion of the locking pin (22) into the locking element bore (18) and the locking element seat (24) so as to constrain the locking pin (22) in the direction of the pin axis (Z).
  15. 15. The tooth tip set as claimed in any one of claims 13 or 14, wherein the intermediate portion (34) of the locking pin (22) is made of an elastic material, such as rubber.
  16. 16. The tooth tip set according to any one of claims 7 to 12, further comprising a connecting pin (23) and an associated locking ring (23 '), the connecting pin (23) extending mainly along a pin axis (P) and being adapted to engage the locking element seat (24) and the locking element hole (18), and the associated locking ring (23') being adapted to constrain the connecting pin (23) in the direction of the pin axis (P).

Description

Tooth tip group for earthmoving machine Technical Field The present invention is in the field of equipment and spare parts for earth moving machinery, such as excavators. In particular, the subject of the invention is a set of tooth tips for earthmoving machines. Background Numerous examples of tooth tip sets for earth moving machines are known in the art. Typically, the tooth tip set consists of a tooth tip, a tooth tip holder, and a locking element (such as a locking pin) for locking the tooth tip to the tooth tip holder. Typically, the tooth tip is provided with a pocket open at the rear and with a locking element aperture formed in a pair of opposed walls of the pocket adapted to engage with a locking element. Typically, the tooth point holder has a body configured to be secured to a bucket of an earthmoving machine, such as by welding, bolting, or bolting, and a nose piece extending from the body and geometrically coupled to a pocket of the tooth point so as to form a male-female coupling. Furthermore, the nose piece is typically provided with a locking element seat adapted to engage with a locking element, which locking element seat extends between two opposite surfaces of the nose piece and which locking element seat is aligned with the locking element aperture when the tooth tip and the tooth tip holder are coupled. The grouping of the tooth tip into two separable pieces (i.e., the tooth tip and the tooth tip holder) advantageously allows the tooth tip to be individually replaced as the tooth tip wears, allowing the tooth tip holder to remain permanently secured to the bucket of the earth moving machine. Thus, the tooth tip to tooth tip holder locking system must be adapted to allow easy and quick replacement of the tooth tip without misleading the direction of insertion of the locking element and without requiring excessive effort from the operator for the operation of inserting the locking element. However, this requirement conflicts with the need to make the coupling between the tooth tip and the tooth tip holder as strong as possible in order to withstand the considerable stresses to which the tooth tip is subjected while the earth moving machine is working. In some known tooth tip sets, in order to make the replacement operation of the tooth tip easier and faster, it has been chosen to forgo achieving optimal constraints between the locking element and the locking element seat with which the locking element is engaged, as a result of which the locking element may come out of the locking element seat after a long period of use of the tooth tip, resulting in decoupling of the tooth tip from the tooth tip holder. In other known embodiments, in order to firmly constrain the locking element, special retaining means, for example of the elastic type, suitable for interacting with the nosepiece of the tooth point holder are provided in the locking element itself. In addition to making the construction of the tooth tip set more complex and thus more expensive, these embodiments have not completely solved the problem of avoiding decoupling of the tooth tip from the tooth tip holder under demanding operating conditions. In fact, all efforts put into this regard are mainly focused on the coupling between the locking element, the tooth tip and the tooth tip holder and are therefore limited to a limited area of the tooth tip set. However, the group of teeth is subjected to stresses during use such that if these stresses are only resisted by the locking element, these stresses may cause the locking element to break and subsequently cause the teeth to decouple from the teeth holder. Other known sets of teeth are provided with holes in the nosepiece of the tooth point holder adapted for engagement with the locking element. In addition to the additional machining of the tooth tip holder, such holes inevitably lead to a weakening of the structure of the tooth tip assembly and its components, which leads to increased production costs. Other known embodiments for tooth tip sets provide an integrated tooth tip-tooth tip holder locking system without the need for a third locking element. However, such an integral locking system requires a tool, such as a crowbar, to lock, unlock or remove the tooth tip, which is not always readily available in such a work environment. Furthermore, this integration also makes further machining of the tooth tip set necessary, resulting in increased production costs. Other known sets of teeth are based on a screw coupling system between the teeth and the teeth holder. In such a system, the nose piece of the tooth tip holder has a spiral shape, being coupled with the tooth tip, so as to relieve the working load of the locking element, which is only provided with the function of preventing the tooth tip from rotational movement in the tooth tip holder and from subsequent disengagement. A typical problem with all these known systems is that the tooth tip tends to fall out of the tooth tip