US-12618230-B2 - Retention system for a wear part for a bucket for an earth moving machine

Abstract

A retention system is for a wear part for a bucket for an earth moving machine. The retention system has in operational use: i) a bucket body having a trench; ii) a force multiplier having a shape substantially corresponding to a shape of the trench; iii) a wear part mounted to an edge of the bucket body, and iv) a plurality of bolts. The wear part and the force multiplier is provided with at least one protrusion and another one of the wear part and the force multiplier is provided with at least one matching recess such that relative movement between the wear part and the force multiplier in a lateral direction parallel to the first mutual interface is prevented, in operational use, for reducing shear forces acting on the bolts.

Inventors

• Arnold Furre
• Anuop Udayakumar
• JEAN-PIERRE VIDAL PIESSET

Assignees

• HENSLEY INDUSTRIES INC.

Dates

Publication Date

20260505

Application Date

20220125

Priority Date

20210209

Claims (20)

1. 1 . A retention system for a wear part for a bucket for an earth moving machine, the retention system comprising: a bucket body comprising a trench having tilted sidewalls extending from an upper side of the bucket body, wherein a smallest lateral dimension of the trench is at a lower side of the bucket body opposite to the upper side; a force multiplier having a shape substantially corresponding to a shape of the trench, wherein the force multiplier is provided with a plurality of through-holes that are spaced apart and distributed over a first surface of the force multiplier, wherein the first surface is located at the upper side of the bucket body, the plurality of through-holes extending to a second surface at the lower side of the bucket body; a wear part mounted to an edge of the bucket body, wherein the wear part forms a first mutual interface with the bucket body extending from the edge over a predefined distance along the lower side of the bucket body beyond the location of the trench, wherein the wear part forms a second mutual interface with the edge of the bucket body, wherein the second mutual interface is under an angle with the first mutual interface, wherein the wear part is provided with a plurality of receiving holes having inner threads, wherein the receiving holes are located at locations corresponding to the plurality of through-holes in the force multiplier, and a plurality of bolts provided in the plurality of through-holes and retained by the inner threads of the plurality of receiving holes.
2. 2 . The retention system according to claim 1 , wherein the shape and location of the trench and the location of the holes are such that after mounting of the retention system there is substantially no gap between the wear part and the bucket body.
3. 3 . The retention system according to claim 1 , wherein the force multiplier is an elongated body and wherein the trench is an elongated trench.
4. 4 . A retention system for a wear part for a bucket for an earth moving machine, the retention system comprising in operational use: a bucket body comprising an edge and a trench, the trench having tilted sidewalls extending from an upper side of the bucket body, wherein a largest lateral dimension of the trench is at the upper side of the bucket body and a smallest lateral dimension of the trench is at a lower side of the bucket body opposite to the upper side, the tilted sidewalls each having elongated flat surfaces; a force multiplier having a shape substantially corresponding to a shape of the trench including elongated tilted flat surfaces, wherein the force multiplier is provided with a through-hole in a first surface of the force multiplier, wherein the first surface is located at the upper side of the bucket body, the through-hole extending to a second surface at the lower side of the bucket body; a wear part mounted to the edge of the bucket body, wherein the wear part forms a first mutual interface with the bucket body extending from the edge over a predefined distance along the lower side of the bucket body, wherein the wear part forms a second mutual interface with the edge of the bucket body, wherein the second mutual interface is under an angle with the first mutual interface, wherein the wear part is provided with a receiving hole located at a location corresponding to the through-hole in the force multiplier, and an axial force transmitter provided in the through-hole to secure the wear part to the force multiplier.
5. 5 . The retention system according to claim 4 , wherein the shape and location of the trench and the location of the through-hole and the receiving hole are such that after mounting of the retention system there is substantially no gap between the wear part and the bucket body.
6. 6 . The retention system according to claim 4 , wherein the force multiplier is an elongated body and wherein the trench is an elongated trench.
7. 7 . The retention system according to claim 4 , wherein one of the wear part and the force multiplier is provided with at least one protrusion and another one of the wear part and the force multiplier is provided with at least one matching recess such that relative movement between the wear part and the force multiplier in a lateral direction parallel to the first mutual interface is prevented in operational use, for reducing shear forces acting on the axial force transmitter, and wherein the holes and the at least one protrusion are axially aligned.
8. 8 . The retention system according to claim 7 , wherein the at least one protrusion comprises an elongated protrusion enclosing two or more receiving holes.
9. 9 . The retention system according to claim 7 , wherein the at least one protrusion comprises two or more protrusions, each protrusion having at least one receiving hole.
10. 10 . The retention system according to claim 4 , wherein the tilted flat surfaces of the force multiplier extend in the direction parallel to the edge a distance greater than a width of two through-holes.
11. 11 . The retention system according to claim 4 , wherein the receiving hole in the wear part has inner threads.
12. 12 . The retention system according to claim 4 , wherein the force multiplier includes opposing lateral ends and the tilted flat surfaces on the force multiplier are planar surfaces extending between the opposing lateral ends.
13. 13 . The retention system according to claim 4 , wherein the wear part comprises a protrusion shaped and sized to extend into a bottom portion of the trench.
14. 14 . The retention system according to claim 13 , wherein the protrusion is adjacent an opening to the through-hole.
15. 15 . The retention system according to claim 13 , wherein the protrusion is an elongated protrusion adjacent to the through-hole.
16. 16 . The retention system according to claim 13 , wherein the protrusion interfaces with the force multiplier.
17. 17 . The retention system according to claim 4 , wherein the force multiplier comprises at least two through-holes, including the through-hole, and the wear part comprises at least two receiving holes, including the receiving hole, located at locations corresponding to the at least two through-holes in the force multiplier.
18. 18 . The retention system according to claim 4 , wherein the force multiplier comprises a protrusion shaped and sized to extend from a bottom portion of the trench.
19. 19 . The retention system according to claim 18 , wherein the protrusion is adjacent an opening to the through-hole.
20. 20 . The retention system according to claim 18 , wherein the force multiplier comprises at least one hole and the protrusion is an elongated protrusion adjacent to the hole.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is the U.S. national stage application of International Application PCT/NO2022/050022, filed Jan. 25, 2022, which international application was published on Aug. 18, 2022, as International Publication WO 2022/173306 in the English language. The International Application claims priority of Norwegian Patent Application No. 20210163, filed Feb. 9, 2021. The international application and Norwegian application are both incorporated herein by reference, in entirety FIELD OF THE INVENTION The invention relates to a retention system for a wear part for a bucket for an earth moving machine, the retention system comprising a bucket body, a force multiplier, a wear part and a plurality of bolts. The invention also relates to the bucket body, the force multiplier and the wear part of the retention system as such. BACKGROUND OF THE INVENTION Retention assemblies for buckets for earth moving machines are known. One of the is-sues to be solved is the replacement of wear parts in such buckets. Several solutions for this problem have been reported. International patent application publication WO2009/082317A1 discloses a wear part for a bucket to a loading or digging machine. The bucket is provided with at least one front edge plate with a forwardly directed engagement edge, wherein the wear part has a forward direction and a rearward direction and is provided with a hook portion for fixing of the wear part to the bucket. The fastening portion has a spanning surface portion for cooperating in a contact surface area with a clamping surface portion on a fastening unit which is positionable through a hole in said front edge plate. The spanning surface portion extends at an angle against said forward direction such that, in use, when tightening said fastening unit a force effecting the wear part in the rearward direction will occur. The document also discloses a fastening unit therefore and a wear part system, a bucket and a loading or digging machine. US patent application publication US2019/0003156A1 discloses a wear member and fastener for securing the wear member to earth working equipment. The fastener can be in-stalled and maintained from the top of the assembly. An eccentric retainer is received in a recess of the wear member and is rotated to shift the wear member rearward on the earth working equipment. A bolt passing through aligned openings of the earth working equipment and the wear member is received by the retainer to secure the wear member to the earth working equipment. Despite these developments there is still a need for safer and more reliable and strong retention systems, to achieve a higher system performance, ease of maintenance and extend the lifetime of wear parts. In view of the above-described problems there is a need to further develop bucket assemblies. SUMMARY OF THE INVENTION The invention has for its object to remedy or to reduce at least one of the drawbacks of the prior art, or at least provide a useful alternative to prior art. The object is achieved through features which are specified in the description below and in the claims that follow. The invention is defined by the independent patent claims. The dependent claims define advantageous embodiments of the invention. In a first aspect the invention relates to a retention system for a bucket for an earth moving machine. The retention system comprises in operational use: a bucket body comprising a trench having tilted sidewalls extending from an upper side of the bucket body, wherein a smallest lateral dimension of the trench is at a lower side of the bucket body opposite to the upper side;a force multiplier having a shape substantially corresponding to a shape of the trench, wherein the force multiplier is provided with a plurality of through-holes that are spaced apart and distributed over a first surface of the force multiplier, wherein the first surface is located at the upper side of the bucket body, the plurality of through-holes extending to a second surface at the lower side of the bucket body;a wear part mounted to an edge of the bucket body, wherein the wear part forms a first mutual interface with the bucket body extending from the edge over a predefined distance along the lower side of the bucket body beyond the location of the trench, wherein the wear part forms a second mutual interface with the edge of the bucket body, wherein the second mutual interface is under an angle with the first mutual interface, wherein the wear part is provided with a plurality of receiving holes having inner threads, wherein the receiving holes are located at locations corresponding to the plurality of through-holes in the force multiplier, anda plurality of bolts provided in the plurality of through-holes and retained by the inner threads of the plurality of receiving holes. In the invention, one of the wear part and the force multiplier is provided with at least one protrusion at the first mutual