KR20240115828A - Wear assembly for buckets of extraction or working machines - Google Patents

Abstract

The wear assembly comprises teeth (1) for the bucket and a tooth holder (3) and a sheath (5) with a housing duct (52), which sheath is received in a tool holder. A key (7) is provided, which is received in the housing duct (52) by pivoting between the insertion direction and the locking direction so as to slide into the housing duct, so as to engage the sheath portion and teeth supported against the tool holder under the action of the key in the opposite direction. The tooth is clamped against the tooth holder by a key supported against it. To ensure reliable manufacturing, the key is made in one piece and includes a bearing cam supporting against the tooth holder and a bearing end 72 supporting against the teeth 1.

Description

Wear assembly for buckets of extraction or working machines

The present invention relates to a wear assembly for a bucket of an extraction or working machine.

The present invention relates to the field of extraction and working machinery equipment, and in particular to buckets, skips or other containers used for working with material, in particular for digging, scraping and/or lifting and transferring material. The materials here are generally heavy, hard, granular and/or abrasive. For example, the material is dirt, rock, aggregate or rubble.

In a known manner, the bucket comprises a toothed cutting blade which is a wear part designed to have the ability to strike and penetrate the material being processed and transported by the bucket. It is expected that each tooth can be replaced individually when installed.

FR 3 011 013 A1 discloses a bucket with teeth and a holder that can be fixed to a support by means of a connecting device. The connection device consists of an elastically deformable sheath, a metal key, a metal toothed cam, a metal crescent and two seals. The key, toothed cam and crescent shaped portion are received in the sleeve. When the connection device is accommodated in the housing of the holder and the teeth are mounted on the holder, the key and the cam are structured to insert the key into the cam, and the key is supported in the radial direction with respect to the teeth, and the cam presses the sheath portion so that the sheath portion is attached to the holder. It is supported against the housing and is capable of rotationally moving against one another in the inner cavity of the sleeve between one or more fastening structures forming a mating connection of the teeth and the holder. The inner cavity of the sheath portion accommodates a metal crescent-shaped portion, which serves as a bearing to support the rotation of the cam-key assembly. The sealing portion is arranged on both sides of the sheath portion to ensure a watertight seal.

These known connecting devices are generally satisfactory and are particularly durable and reliable despite intensive use of the bucket. However, these connectors are relatively complex to manufacture because a total of six parts must be provided. Some important parts, such as keys and toothed cams, must be formed by difficult forging methods and require subsequent machining to obtain the tooth shape or form the key head.

One of the objects of the present invention is to obtain a new wear assembly for buckets that is easier to manufacture without compromising reliability and replaceability of the teeth when worn.

The present invention aims at a wear assembly for a bucket of an extraction or working machine, the wear assembly comprising: a tooth holder to be secured to the bucket and comprising a keyway traversed by a keyway axis; teeth configured to be seated in the tooth holder along a seating direction; and a keying device. The keying device includes a sheath portion comprising a housing duct and an outer wall, the sheath portion being configured to be received in the keyway by the outer wall, whereby the sheath portion is rotationally fixed relative to the tooth holder by the outer wall about the keyway axis. The keying device allows the key to slide in the housing duct 52, and the sheath portion is accommodated in the key groove in an insertion orientation, and while the sheath portion is accommodated in the key groove, the keying device supports the key against the bearing seat belonging to the tooth in the seating direction, thereby supporting the key. It includes a key which is to be received in the housing duct so that under action the teeth are clamped against the tooth holder in the seating direction and the sheath portion is pivotable relative to the sheath portion between fastening orientations supported relative to the keyway in opposite directions.

According to the invention, the key is monolithic and includes a bearing cam and a bearing end formed in one piece. According to the invention, the bearing of the key to the bearing seat is achieved by a bearing end directly supported on the bearing seat in the seating direction. According to the invention, the bearing of the sheath part to the keyway is achieved by a bearing cam bearing to the housing duct in the direction opposite to the seating direction.

One idea of the invention is to have the bearing cam and the bearing end comprised of a single piece, namely a key, to facilitate the manufacture of the keying device. In fact, the key can be manufactured in a single operation, for example by forging within the same mold to form the bearing cam and bearing end in a single piece. If forging or similar manufacturing methods are used to obtain the keys, there is no need to provide several separate dies to form the bearing cams and bearing ends. There is also no need to provide a notch or other connecting means between the key and the bearing cam to enable the key to rotate the bearing cam, since the key and the bearing cam are formed of the same piece and are completely integrated. If the keys are formed, for example by forging, the advantage is that there is no need to provide additional significant manufacturing steps, such as machining, other than possible deburring.

This advantage for wear assembly manufacturing does not affect the reliability of the wear assembly because when the keying device is received in the keyway with the key in a locking orientation, the teeth are firmly clamped and supported in the tooth holder. As the teeth wear, the sheath elastically absorbs any play to clamp the teeth. Simply rotating the key secures the teeth, making assembly of the teeth easier as no striking tool is required.

Preferably the sheath is monolithic and the outer wall and housing duct are formed as a single piece. Preferably, the bearing cam contacts the housing duct without any intermediate parts between the key and sheath. Preferably, the housing duct is coated with a lubricant.

Preferably, the bearing seat comprises two primary faces, each primary face being obliquely oriented by being rotated in a direction opposite to the seating direction towards the other primary face. Preferably, the bearing end comprises two secondary faces, the bearing end bearing against a bearing seat received between the primary faces, each secondary face bearing against one of the primary faces.

Preferably, the teeth include retaining ribs. Preferably, the key is formed integrally with the bearing end, and the key is received in the housing duct and the sheath portion is received in the keyway when the key is in the locking direction so as to secure the key against the teeth parallel to the keyway axis. It includes two radial shoulders arranged side by side to capture the retaining rib between them and to be separated from the retaining rib when the key is in the insertion direction.

Preferably, both the key and the teeth are rotationally stopped when the key is in the insertion direction, limiting pivot rotation of the key in the insertion direction, and are rotationally stopped when the key is in the locking direction so that the key pivots in the locking direction. limit what you do

Preferably, the key includes disassembly grooves arranged along the bearing ends. Preferably, when the sheath portion is received in the key groove and the key is received in the housing duct, the disassembly groove is separated from the bearing seat when the key is in the insertion direction and the key is extracted from the housing duct by introducing a disassembly tool into the interior of the disassembly groove. and may rotate relative to the bearing seat when the key is in the locking direction.

Preferably, the key defines a parting line across the bearing cam and bearing end, wherein the bearing cam and bearing end are tapered on either side of the parting line.

Preferably, the key includes an actuator head adapted to engage an actuator tool to pivotally actuate the key between an insertion direction and a locking direction, the actuator head being formed integrally with the bearing cam and the bearing end and the key being positioned in the housing duct. When accommodated in, it protrudes from the sheath portion. Preferably, the actuator head is tapered on either side of the parting line.

Preferably, to engage the actuator tool, the actuator head includes an actuator notch and two fingers, the fingers being arranged on both sides of the actuator notch to define the boundary of the actuator notch, and the actuator notch and the two fingers being disposed at the parting line. It is traversed by and both sides of the dividing line are tapered.

Preferably, the tooth includes a keyhole through which the keyway opens when the tooth is received in the tooth holder, and the bearing seat is formed at the edge of the keyhole. Preferably, the wear assembly further comprises a plug configured to close the keyhole by capping the keying device while the sheath portion is received in the keyway and the key is received in the housing duct in a locking direction.

The invention is presented by way of non-limiting example only and will be better understood upon reading the following description made with reference to the accompanying drawings presented below.

1 is an exploded perspective view of a wear assembly and actuator socket according to one embodiment of the invention, where the key is shown in the insertion direction and the tooth holder is shown mounted on the bucket.
Figure 2 is a perspective view of the wear assembly of Figure 1 assembled from another angle, with the key in the locking direction and obscured by the plug.
Figure 3 is a partial cross-sectional view taken along section II of Figure 2;
Figure 4 is a side view of the wear assembly of the previous figure with the key in insertion direction and the plug omitted.
Figure 5 is a side view of the wear assembly of the previous figure with the key in locking direction and the plug omitted.
Figure 6 is a front view of the key shown in the previous drawings.
Figure 7 is a side view of the key shown in the previous drawings.
Figure 8 is a front view of a sheath part belonging to the wear assembly of the previous figures, receiving a key in the direction of insertion, where the key is shown in cross-section;
Figure 9 is a perspective view showing the sheath portion of Figure 8 alone.
Fig. 10 is a perspective view of the plug of Fig. 2;

1 to 10 show a wear assembly according to one embodiment of the invention comprising teeth 1, tooth holder 3, sheath 5 and key 7. The sheath portion and key 7 together constitute a keying device. The wear assembly preferably includes a plug 9 as can be seen in FIGS. 2, 3 and 10. Figure 1 also shows the actuator tool 11, the schematic disassembly tool 14 and the bucket 13, partially shown in dashed lines.

The bucket 13 belongs to construction machinery or mining machinery. “Working machinery” means, for example, an excavator, excavator, bulldozer or similar construction machinery. “Extraction machine” means, for example, a loader, load-haul-dump (LHD) or other machine of the same type. The term "bucket" applies to buckets, skips and other receptacles mounted on such machinery, capable of scraping, lifting and/or moving material, preferably above ground, to move material from one location to another. . Bucket 13 forms a trough with an access opening of, for example, rectangular shape. The access opening is defined by four edges, of which edge 131, to which the wear assembly is to be attached, is shown in Figure 1. Among these edges, here it may include a leading edge formed by edge 131 . Preferably, this edge 131 is located at the bottom or top of the bucket 13 and is oriented parallel to the ground.

As shown in Figure 1, the tooth holder 3 is permanently fixed to the edge 131 of the bucket 13 and is adapted to receive and transport the teeth 1 in a removable manner, so that when worn, the teeth 1 ) can be replaced.

A seating direction D31 is defined, which is fixed relative to the tooth holder 3. When attaching the tooth holder 3 to the bucket 13, the D31 direction is directed toward the inside of the bucket 13 perpendicular to the edge to which the tooth holder 3 is attached. When the tooth 1 is received in the tooth holder 3, the D31 direction is from the tooth 1 to the tooth holder 3.

The tooth holder 3 has a base 31 , by means of which the tooth holder 3 is attached to the bucket 13 , in particular to the edge 131 . For this purpose, the base 31 is for example of a clamp-like shape spanning the edge 131 as shown in FIG. 1 . In order to permanently fix the tooth holder 3, the base 31 is preferably welded to the edge 131.

The tooth holder 3 includes a seating nose portion 32 that accommodates the tooth 1 by seating the tooth in the nose portion 32 along the D31 direction. Figure 2 shows the tooth 1 seated in the tooth holder 3. As shown in FIGS. 1 and 3, the nose portion 32 and the base 31 are continuously arranged along the D31 direction. The nose portion 32 and the base 31 are integrated. The nose portion 32 faces a direction opposite to the D31 direction. When the tooth holder 3 is attached to the bucket 13, the nose portion 32 protrudes from the edge 131.

The tooth holder 3 includes a keyway 33 that crosses the tooth holder 3 from one side to the other side. The keyway 33 crosses the nose portion 32. The keyway 33 is fixed relative to the tooth holder 3 and extends along the keyway axis X33 which is perpendicular to the D31 direction or at least transverse to the D31 direction. Preferably, the keyway 33 is coaxial with the axis X33. Preferably, the keyway 33, especially the axis X33, is parallel to the edge 131 when the tooth holder 3 is attached to the bucket 13. The keyway 33 provides a through end 34 on one side of the tooth holder 3 and a through end 35 on the other side of the tooth holder 3, as shown in FIG. 3 .

Preferably, the tooth holder 3 is monolithic in that the base 31, nose portion 32, and keyway 33 are formed as one piece. Preferably, the tooth holder is made of steel that is cast or forged, cast and then machined, or forged and then machined.

The teeth 1 include tips 15, whereby the teeth 1 are adapted to process the material worked by the bucket 13 when received on the bucket 13 by the tooth holder 3. Tip 15 is used for scraping, lifting or impacting the material being worked. Here the tip 15 forms a slightly flat point, but depending on the material to be worked with and the nature of the task to be performed, it may have other shapes, in particular a more pointed or flat shape or a double-pointed shape.

In this example, in order to be seated on the tooth holder 3 in the D31 direction, the tooth 1 includes a cavity 16, a lug 17, preferably a lug 18, complementary to the nose portion 32. do.

Preferably, the cavity 16 is provided to be open along the D31 direction. The cavity 16 partially extends inside the tip 15 in the direction opposite to D31. When the tooth 1 is seated on the tooth holder 3, the male portion 36 belonging to the nose portion 32 is received in the cavity 16, and the cavity 16 and the male portion 36 are complementary. am. Preferably, the male portion 36 and the cavity 16 have a generally pyramidal or truncated conical shape with respect to the contact area, with this shape radiating along the D31 direction. As a result, the teeth 1 are seated in the tooth holder 3 in a pyramid or cone shape. This particular type of seated configuration means that clamping the tooth (1) relative to the tooth holder (3) in the D31 direction ensures the exact centering of the tooth (1) and thus securely holds the tooth in the tooth holder (3) without play. do.

Preferably the lugs 17, 18 are provided oriented along the D31 direction from the tip 15. The lugs 17 and 18 protrude from the edge of the cavity 16 along the D31 direction. Preferably, the lugs 17, 18 are laterally distributed on opposite sides so that they extend on both sides of the nose portion 32 when the teeth 1 are seated on the tooth holder 3. Then, the lug 17 covers the end 34 of the keyway 33 and the lug 18 covers the end 35. When the tooth (1) is seated, the lugs (17 and 18) cross the axis (X33).

Preferably, the lug 17 includes a keyhole 19 passing directly through the lug 17 from one side to the other. When the teeth 1 are seated, the keyhole 19 is traversed by the axis X33 and forms a straight line with the end 34 of the keyway 33.

Preferably, lug 18 includes a keyhole 20 that crosses lug 18 from one side to the other. When the teeth 1 are seated, the keyhole 20 is traversed by the axis X33 and forms a straight line with the end 35 of the keyway 33.

For example, the nose portion 32 is provided to include a recessed slot 37 to receive the lug 17 when the tooth 1 is seated. The slot 37 is located in the direction D31 with respect to the male portion 36 at the boundary between the nose portion 32 and the base 31. The edges of slot 37 , which delimit slot 37 , extend around end 34 . When the teeth 1 are seated, the edges of the slots 37 extend around the lugs 17.

For example, the nose portion 32 is provided to include a recessed slot 38 to receive the lug 18 when the teeth 1 are seated. The slot 38 is located in the direction D31 with respect to the male portion 36 at the boundary between the nose portion 32 and the base 31. The edges of the slot 38 that delimit the slot 38 extend around the end 35 . Slots 37, 38 are arranged on both sides of the tooth holder 3, traversed by axis X33. When the teeth 1 are seated, the edges of the slots 37 extend around the lugs 17.

As can be seen in FIGS. 1 and 3 , the teeth 1 comprise a bearing seat 21 , which is formed here in a keyhole 19 . The bearing seat 21 occupies only a part of the circumference of the keyhole 19, for example around the axis X33, that is, a part in the D31 direction. Generally speaking, when the teeth 1 are seated, the sheet 21 is rotated in the direction opposite to the X33 direction. Sheet 21 forms two sides 22, known as “primary sides”. Preferably, the faces 22 are oblique to each other, ie oriented in the “V” direction. The faces 22 face each other in a way that creates an accommodating space between the faces. Preferably, when the tooth 1 is seated, the face 22 is at the same height along the axis X33 and is rotated towards the axis X33. Advantageously, the plane 22 is parallel to the axis X33. When the teeth 1 are seated, the faces 22 are oriented in a converging manner along the D31 direction. The face 22 is rotated in a direction opposite to the D31 direction. Preferably, when the tooth 1 is seated, the face 22 is symmetrical about the D31 direction and a plane parallel to the axis X33. Preferably, face 22 is substantially flat. For example, the faces 22 are inclined at an angle of 60 degrees with respect to each other, and each face 22 is oriented at an angle of 30 degrees with respect to the D31 direction.

Preferably, the teeth 1 are monolithic in that the tip 15, cavity 16, lugs 17 and 18 and keyholes 19 and 20 are formed as one piece. Preferably, the teeth are made of steel that is cast or forged, cast and then machined, or even forged and then machined.

Due to the complementarity of the cavity 16, the lugs 17, 18, and the nose portion 32, when the tooth 1 is seated on the tooth holder 3, the tooth 1 is positioned against the tooth holder 3 in the direction opposite to the D31 direction. The tooth (1) is completely fixed in the tooth holder (3) except that (1) is not restrained backwards for relative translation. Complete fixation of the teeth 1 is achieved by a keying device comprising a sheath 5 and a key 7, as described below.

The sheath 5 is shown in Figures 1, 3, 8 and 9. The sheath portion 5 is accommodated in the keyway 33 as shown in FIG. 3 and is configured to accommodate the key 7 therein. Accordingly, the keying device is received in the keyway 33 by the sheath portion 5.

The sheath 5 includes an outer wall 51, a housing duct 52, an end 53, and an end 54. Preferably, the sheath portion 5 is monolithic, and the outer wall 51, the housing duct 52, and the ends 53 and 54 are formed as one piece. The sheath portion 5 is provided to be elastically deformable, unlike the key 7, the tooth 1, and the tooth holder 3, which are provided rigidly. For this purpose, the sheath 5 is made, for example, of elastomer and formed by molding.

Preferably, when the sheath portion 5 is received in the keyway 33, the sheath portion 5 does not protrude beyond the ends 34 and 35, as shown in Figure 3. In particular, end 53 is flush with end 34 and end 54 is flush with end 35.

Housing duct 52 is preferably a through passage opening at ends 53 and 54. Optionally, housing duct 52 may be open at least at end 53. When the sheath 5 is received in the keyway 33, the axis X33 traverses the duct 52 from end 53 to end 54. Preferably, when the sheath 5 is not deformed, the duct 52 is coaxial with the axis X33.

The outer wall 51 surrounds the inward-facing housing duct 52 and faces outward. Wall 51 connects ends 53 and 54. The outer wall 51 surrounds the housing duct from end 53 to end 54 and surrounds the axis X33 when the sheath 5 is received in the keyway 33.

The sheath portion 5 is accommodated in the keyway 33 by the outer wall 51. Preferably, when the sheath portion 5 is received in the keyway 33, the outer wall 51 is in direct contact with the keyway 33, preferably over all or most of the surface of the outer wall 51. For this purpose, the keyway 33 and the wall 51 are complementary in shape. The outer wall 51 and the keyway 33 are shaped to prevent the sheath portion 5 from rotating about the axis X33 when the sheath portion 5 is received in the keyway 33.

Optionally, a recess is provided in the outer wall 51 to facilitate deformation of the sheath portion 5. In this case, the outer wall 51 is preferably in contact with the keyway 33 over its entire surface, excluding these recesses.

For this purpose, for example, the outer wall 51 is provided with a radial groove 55 in relief, here starting from the end 53 and running locally over the length of the sheath 5, which groove 55 is concave. It is received in a radial groove 39 and is formed starting from the end 34 and spanning a portion of the length of the keyway 33. Alternatively or additionally, for example, the outer wall 51 defines a flat 56 extending from end 53 to end 54, which is shown in FIGS. 1 and 9 and is indicated by a dotted transparent line in FIG. 8. It is shown. This flat 56 is complementary to the flat formed by the keyway 33 from end 34 to end 35. Alternatively or additionally, the outer wall 51 and the keyway 33 may be provided to provide a transverse oval cross-section along the axis X33 to block rotation.

Except for the portion blocking the rotation of the sheath portion 5 about the axis ) and from end 53 towards end 54 along the axis X33. The sheath 5 is preferably flexible so that it can be inserted into and removed from the keyway 33 along the axis X33 by the end 34 when the teeth 1 are not present. Advantageously, the complementarity of the truncated conical shapes of the outer wall 51 and the keyway 33 ensures that the sheath portion 5 is attached to the keyway 33 until it abuts the truncated conical stop of the keyway 33 along the axis This means that it must be inserted, thereby avoiding the need to position the sheath portion 5 beyond the end 35 of the keyway 33.

The housing duct 52 allows the key 7 to be inserted into the sheath 5 between the so-called “insertion direction” shown in FIGS. 1, 4 and 8 and the separate so-called “locking direction” shown in FIGS. 3 and 5. It is designed to accommodate the key 7 in such a way that it can be pivoted relative to . The key (7) is obscured by the plug (9) and is not visible in Figure 2. Figure 2 shows the wear assembly, with the key (7) in the locking direction.

In this example, when the sheath portion 5 is received in the keyway 33 and the tooth 1 is received in the tooth holder 3, the end 53 of the duct 52 is inserted into the keyhole 19 of the tooth 1. ) is open from the front. Preferably, the end 54 of the duct 52 opens in front of the keyhole 20 of the teeth 1. Duct 52 provides a shape that allows rotation of key 7 about an axis parallel or slightly inclined to axis X33. In cross-section about axis X33, duct 52 has a circular shape over most of its circumference. Preferably, as shown in Figure 8, the circumferential portion 57 of the circular portion of the duct 52 is oval-shaped, i.e. recessed, and the radius is locally increased compared to the radius of the circular portion of the remaining portion of the circumference. do. This arrangement allows the egg-shaped portion 57 to be radially spaced from the key 7 to reduce friction, thus facilitating pivoting of the key 7 within the duct 52 . That is, due to the egg-shaped portion 57, the key 7 contacts the duct 52 only on a portion of its circumference.

Preferably, duct 52 is truncated cone-shaped, converging along axis X33 from end 53 to end 54 as shown in FIG. 3 .

In general, the sheath 5 is advantageously tapered from the end 53 so that it can be obtained in a single molding operation within a single mold without any subsequent re-molding or assembly of the sheath 5 . This tapered shape is reflected, for example, in the conical shape of the outer wall 51 and the duct 52 described above. The mold cavities are displaced relative to each other along the opening axis of the mold, which is parallel to axis X33 and across duct 52. This allows the obtained sheath to be monolithic and formed from the same elastically deformable material, such as an elastomer.

In order to facilitate the turning of the key 7 within the housing duct 52, it is preferably provided to coat the housing duct 52 with a lubricant, for example to provide lifelong lubrication. This is particularly useful when the duct 52 is formed integrally with the outer wall 51 from an elastically deformable material. The key 7 can then be pivoted without any intermediate parts between the key 7 and the sheath 5 . However, pivoting without lubricant can also be provided.

Optionally, the sheath 5 may be provided non-monolithically, wherein part or all of the duct 52 is formed of a solid piece, for example metal, and includes an outer wall 51 . ) The remaining part is formed of an elastically deformable material such as an elastomer. The hard part serves as a bearing for the rotation of the key (7). In this case, it can advantageously be provided that the elastomer is overmolded onto the hard part forming the duct 52 and that the hard part is bonded to the elastomer.

Optionally, the sheath portion 5 may be made of elastomer, and metal or fiber reinforcement may be embedded therein to structurally strengthen the sheath portion 5 and improve durability.

The key 7 defines non-coincident axes X71 and X72, which are preferably parallel or slightly inclined to each other. In this example, the key 7 includes a distal end 73, a bearing cam 71, a bearing end 72 and an actuator head 74, in that order along axis X71. The bearing cam 71 is coaxial with axis X71, and the distal end 73 and head 74 are coaxial with axis X72, which is parallel to axis That is, the cam 71 is offset relative to the bearing end 72, preferably relative to the distal end 73 and head 74. The ends 72 and 73 are separated by a cam 71. Cam 71 and head 74 are separated by end 72.

Key 7 is completely monolithic in that all parts of key 7 are formed as one piece. In particular, the bearing cam 71 is manufactured integrally with the bearing end 72, preferably with the end 73, the head 74 and all parts of the key 7 described here.

Preferably, it is provided that the key 7 is made entirely of forged steel without further machining. Preferably, the key 7 is formed entirely by a single forging operation in a single mold with the metal introduced in billet form. Preferably, no assembly operations and no machining or other subsequent rework are performed except for the burrs formed in the parting line P7 as a result of forging. At a minimum, the need to rework the key (7) after forging is reduced. This makes it easier to manufacture the key (7).

Optionally, the key 7 may be obtained by forming rather than forging.

In order to obtain a key according to such a manufacturing method, especially as can be seen in Figure 6, the key 7 is connected to a bearing cam 71, a bearing end 72, preferably an actuator head 74 and a parting line ( The taper on either side of P7 serves to define a dividing line P7 across the distal end 73 . In Figure 3, the cross section cut along the dividing line P7 coincides with plane II. Axes X71 and X72 are contained within parting line P7. On both sides of this parting line P7, all parts of the key 7, especially the cam 71, end 72, end 73 and head 74, are provided to be tapered. That is, no face of the key 7 is undercut with respect to the parting line P7. That is, all external surfaces and contours of the key 7 can be removed from the mold, which is oriented relative to the parting line P7 and opened along a direction perpendicular to the parting line P7. More precisely, it comprises a first cavity forming an entire part of the key 7 on one side of the parting line P7 and a second cavity forming an entire part of the key 7 on the other side of the parting line P7. It is designed to form a key (7) in the mold, and the two cavities are joined at the dividing line (P7) during forging.

The key 7 is designed to be received in the sheath 5 , in particular in the duct 52 , as shown in FIG. 3 . In that the bearing cam 71 is accommodated inside the duct 52, the key 7 is accommodated in the duct 52, and when the tooth 1 is seated, the end 72 and the head 74 are connected to the key hole 19. and the end portion 73 is accommodated in the keyhole 20. Preferably, when the key 7 is received, the key 7 does not protrude beyond the teeth 1 along the axis (33), and the end portion (73) is completely accommodated in the keyhole (20) and keyway (33). The cam 71 is completely received in the keyway 33 without protruding beyond the keyway 33 along the axis X33.

Once received in the duct 52, the key 7 can be pivoted relative to the sheath 5 by the head 74 between an insertion direction and a locking direction. To carry out this pivoting, the key 7 is adapted to make less than one complete rotation about the axis X33 relative to the sheath 5 and the tooth holder 3. For example, the key 7 is semi-rotated. In the example, when the key (7) is in the insertion direction, the axis (X71) is in the D31 direction with respect to the axis (X72), and when the key is in the locking direction, the axis ( It is in In the insertion direction, the cam 71 protrudes in the D31 direction with respect to the end portion 73, and the end portion 72 protrudes in a direction opposite to the D31 direction with respect to the cam 71. In the locking direction, the cam 71 projects in a direction opposite to the D31 direction with respect to the end 73, and the end 72 projects in the D31 direction with respect to the cam 71. In both directions, it is advantageously provided that the parting line P7 is parallel to the D31 direction.

To be coaxial with axis X72, end 73 is provided to be generally cylindrical with a circular base centered on axis In order to form a single piece with the remainder of the key 7, it is advantageously provided that the end portion 73 is traversed by the dividing line P7 and is tapered on both sides of the dividing line P7.

To be coaxial with axis X71, cam 71 provides a form of rotation about axis The cam 71 provides a bearing portion 81 and a back portion 82, both of which are traversed by a parting line P7 and extend along the entire length of the cam 71 to form an end 72 at an end 73. ). The bearing portion 81 projects radially from the end 73 parallel to the parting line P7, while the back portion 82 is an extension of the end 73. In the insertion direction, the bearing portion 81 faces the D31 direction and the back portion 82 faces the opposite direction. In the locking direction, the bearing part 81 is oriented opposite to the D31 direction and the back part 82 is oriented along the D31 direction. In order to form a single piece with the remaining part of the key 7, the cam 71 is tapered on either side of the parting line P7 by crossing the parting line P7 including said parts 81 and 82.

The end portion 72 includes a bearing portion forming two sides 83 and a back portion 84 . Both the back portion 84 and the bearing portion forming the surface 83 are traversed by the dividing line P7.

Surfaces 83, known as “secondary surfaces”, are shown in Figure 6, one of which is shown in Figure 1 and the other in Figure 7. The face 83 is complementary to the face 22 of the sheet 21 formed by the teeth 1, as explained below. Preferably, face 83 is symmetrical about parting line P7. Preferably, face 83 is substantially flat. Preferably, the faces 83 are arranged at the same height along the axis X72. Preferably, the faces 83 are oriented in a “V” direction, i.e. in such a way that they converge from the axis X72 on either side of the parting line P7 while rotating in opposite directions. For example, the faces 83 are inclined at an angle of 60 degrees with respect to each other, and each face 83 is oriented at an angle of 30 degrees with respect to the parting line P7. Preferably, the bearing portion of the end 72 forming face 83 is rotated away from the bearing portion 81 about axis X71 and/or axis X72. The end bearing portion 72 forming the face 83 is rotated to the same side as the back portion 82 .

The back portion 84 is preferably semi-cylindrical and extends the bearing portion 81 of the cam 71.

In order to be integrated with the rest of the key 7, the end portion 72 includes a bearing portion forming a face 83 and a back portion 84 of the parting line P7, which is traversed by the parting line P7. Tapered on both sides.

In the insertion direction, the bearing part forming the face 83 faces in the direction opposite to the D31 direction, and the part 84 follows the D31 direction. In the locking direction, the bearing part forming face 83 is oriented along the D31 direction, while the part 84 is oriented in the opposite direction.

In the insertion orientation, the key 7 can be slid relative to the sheath 5 along the axis It is accommodated in the keyway 33 regardless of whether it is seated in or not. Insertion or extraction of the key (7) is performed through the keyhole (19) of the tooth (1). In order to be inserted in this way, the key 7 is inserted into the keyhole 19 without deforming the sheath 5 and without contacting the duct 52 or being supported against the teeth 1 when in the insertion direction. It is provided for sliding through duct 52 and keyhole 20.

The end 73 is difficult, except on a possible egg-shaped portion 57 that is recessed relative to the cap 71, as shown in FIG. 8, where the key 7 is cut at the level of the cap 71. While being radially thinner than the cam 71 so as to pass through the duct 52 without the duct 52, the cam 71 is preferably provided to be radially thicker so as to be in direct contact with the duct 52 substantially around the entire circumference of the duct. do. As shown in Fig. 8, in the insertion direction, the bearing portion 81 of the bearing cam 71 is oriented along the D31 direction and the back portion 82 is rotated in the opposite direction.

The cam 71 is radially thicker than the end 73, and the cam 71 forms an axial shoulder 79 close to the end 73, which has teeth 1 parallel to the axis and in particular limits the position of the key 7 relative to the lug 18 when the key 7 is inserted into the sheath 5. Accordingly, the axial positioning of the key 7 is particularly accurate, as shown in FIG. 3 .

In this insertion direction, the distal end 73 is preferably located in the center of the keyhole 20.

In this insertion orientation, the bearing portion of the bearing end 72 including the face 83 is rotated away from the seat 21 in the direction opposite to the D31 direction, as shown in FIGS. 1 and 4. In this insertion orientation, the bearing portion of the bearing end 72 is radially spaced away from the teeth, and in particular radially away from the keyhole 19 . In this insertion orientation, the back portion 84 does not contact, or does not support, the primary surfaces 22 of the sheet 21 received between the primary surfaces 22.

Preferably, the axes X71 and X33 are provided to coincide in the insertion direction. Preferably, the cam 71 is thinner than the end 72 and/or the head 74 so that the cam 71 traverses the keyhole 19 without difficulty. A radially wider end 72 and/or head 74 than the cam 71 reduces the risk of inserting the key 7 in the wrong direction.

3 and 5, when the key 7 is turned in the locking direction when the tooth 1 is seated, the keying device fixes the tooth 1 with respect to the tooth holder 3 in the D31 direction. . That is, the key pulls the tooth (1) in the D31 direction with respect to the tooth holder (3) and fixes the tooth (1) to the tooth holder (3) in this D31 direction. Then, the tooth (1) is firmly fixed to the tooth holder (3).

In order for the key 7 to achieve this clamping action, the end 72 of the key 7 in the locking direction is supported against the bearing seat 21 of the tooth along the D31 direction, and the bearing cam 71 is held in the D31 direction. It is supported against the keyway 33 by the sheath portion 5 in the opposite direction. Preferably, it is also provided that the end 73 is supported against the keyhole 20 of the teeth along the D31 direction. It is also provided that there are no other intermediate parts providing support between the key (7) and the teeth (1). That is, the ends 72 and 73 are in direct contact with the teeth 1, especially the sheet 21 and the keyhole 20, respectively, and are supported in the D31 direction. The only intermediate part between the key (7) and the tooth holder (3) is the supporting sheath (5). That is, in order to support it in the direction opposite to D31, the bearing cam 71 is in direct contact with the duct 52 of the sheath portion 5, and the sheath portion is in the keyway 33 of the tooth holder 3 in the direction opposite to D31. comes into direct contact. According to the dividing line P7, only the sheath portion is interposed between the cam 71 and the keyway 33.

In particular, in the locking direction, each secondary face 83 of the end 72 is supported flat against one of the primary faces 22 of the seat 21 of the tooth 1, and the secondary face 83 ) is received between the primary faces 22. The faces 22 are rotated towards each other and arranged obliquely, and the ends 72 and the teeth 1 are, thanks to this bearing, centered relative to each other perpendicular to the parting line P7. These obliquely opposed bearings of the faces 22, 83 also support the end 72 in the D31 direction relative to the teeth 1 as a whole. These bearings on the faces 22, 83 also lock the pivoting of the key 7 relative to the tooth holder 3, which prevents the key from accidentally turning in the direction of insertion during use of the wear assembly. However, applying sufficient torque to the head 74 of the key 7 will cause the key 7 to pivot back to the insertion direction, allowing the key 7 to be removed and tooth 1 replacement to be performed.

Alternatively, instead of the face 83, it may be provided that the bearing part of the bearing end 72 is semi-cylindrical and centered on the axis X72, with the seats having a complementary shape.

In particular, in the locking direction the portion 84 is oriented in the opposite direction to the sheet 21 by being oriented in the direction opposite to the D31 direction. As a result, portion 84 extends radially away from keyhole 19.

Preferably, in the locking direction, the end portion 73 supports a portion of the keyhole 20 along the D31 direction. Since these bearings are cylinder-cylinder bearings, they tend to center the key (7) and teeth (1) on each other perpendicular to the parting line (P7). Advantageously, the end 73 completely closes the keyhole 20 to the nearest rotation gap to prevent foreign matter from entering the wear assembly through the keyhole 20 during use.

In particular, in the locking direction, as shown in FIG. 3, the bearing portion 81 of the cam 71 supports the portion 59 of the duct 52 in the direction opposite to the D31 direction. The portion 59 is preferably adjacent to the portion 57. As shown in Figure 3, the sheath portion 5 is pressed between the portion 81 of the cam 71 and the keyway 33 and is elastically deformed in the portion 59. To illustrate this variation, Figure 3 shows a hatched area indicating the offset of the portion 59 in the direction opposite to the D31 direction with respect to its initial position relative to 59A. Figure 8 shows the portion 59 with the sheath portion in an undeformed state. Due to this deformation of the sheath portion 5, the sheath portion 5 pushes the key 7 in the D31 direction, and the key 7 drives the teeth 1 in the D31 direction to press the ends 72 and 73. It is fixed to the tooth holder through the teeth holder. That is, the ends 72 and 73 are held against the sheet 21 and the keyhole 20, respectively, under the elastic action of the sheath portion 5. This elasticity allows for any play that may be created parallel to the D31 direction by caulking and/or caulking of the teeth 1 and/or tooth holders 3 during use of the wear assembly. Even when the wear assembly is worn, the teeth 1 remain fixed.

The bearing of the key 7 relative to the tooth 1 along the D31 direction is preferably distributed on both sides of the tooth 1 on the lugs 17 and 18 by the bearings of the ends 72 and 73 of the key, respectively. Supporting the key 7 against the keyway 33 is carried out in opposite directions by means of a cam 71 between the ends 72 and 73.

While pivoting the key 7 from the insertion direction to the locking direction, the face 83 rotates past the face 22, while the key 7 rotates along the D31 direction due to the elasticity of the sheath portion 5. 1), indexing the rotation until the locking direction is reached. While the key (7) is rotating, the technician will notice an indexing effect, which indicates that the teeth (1) are properly secured.

Preferably, as shown in Figures 1 and 3, the teeth 1 hold the key 7 axially when received in the locking direction and at the same time do not oppose insertion and extraction of the key when in the insertion direction. It includes retaining ribs 23 that do not. Preferably, the fixing rib 23 is formed at the edge of the keyhole 19. For example, a rib 23 is formed between two faces 22 of the sheet 21 to connect the faces 22 together. The ribs 23 are flush with the face 22 along the axis X33. More generally, it is desirable for the ribs 23 to occupy only a portion of the keyhole 19 so that the key 7 cooperates axially with the ribs 23 only in the locking direction and not in the insertion direction. In this embodiment, when the tooth 1 is seated in the tooth holder, the rib faces the direction opposite to the D31 direction and is formed in the portion of the keyhole 19 on the D31 direction side.

Complementary to the ribs 23, the key 7 comprises a radial shoulder 85 and a radial shoulder 86 spaced apart from each other along the axis X71. The shoulders 85, 86 are formed at the bearing end 72. More specifically, shoulder 85 axially connects cam 71 to bearing end 72, and bearing end 72 connects shoulder 85 to shoulder 86. In particular, face 83 connects shoulders 85 and 86 to each other. Each radial shoulder 85, 86 occupies only a portion of the key 7 about axis do. Two radial shoulders 85, 86 project radially in the same direction from the bearing end 72. For example, in the locking direction the shoulders 85, 86 are oriented along the X31 direction. In the insertion direction, the shoulders 85, 86 face in opposite directions.

In order to be formed integrally with the rest of the key, the shoulders 85, 86 are advantageously tapered on either side of the parting line P7, both of which are crossed by the parting line P7.

In the locking direction, as shown in Figure 3, the rib 23 is captured between two shoulders 85, 86 and holds the key 7 along the axis X33 with respect to the tooth 1 and the tooth holder 3. ) is fixed. More precisely, the shoulder 85 is supported against the ribs 23 parallel to the axis X33 in the extraction direction of the key 7 to prevent extraction. The shoulder 86 is supported against the rib 23 parallel to the axis X33 in the direction of insertion of the key 7 so that the key 7 is not inserted too far into the sheath 5.

In the insertion direction, the shoulders 85, 86 are separated from the ribs 23 and rotated away from the ribs 23 to allow sliding of the key 7 relative to the sheath 5 parallel to the axis X33. . That is, the shoulders 85 and 86 are not axially supported against the ribs 23 when sliding the key 7 and therefore do not interfere with this sliding.

Preferably, as can be seen in FIGS. 4 to 7 , the key 7 comprises stop splines 87A, for example radially embossed at the bearing end 72 . The splines 87A are preferably formed on a portion of the key 7 radial to the axis X72, and the splines 87A project perpendicularly to the parting line P7 about the axis X72. That is, the spline 87A is located at 1/4 turn of the key 7 with respect to the portion supporting the surface 83. For example, in the insertion direction the spline 87A is perpendicular to the D31 direction, towards the bottom of the teeth 1 as shown in Figure 4, i.e. towards the outside of the bucket 13, whereas in the locking direction, i.e. , the splines 87A are directed in the opposite direction, that is, toward the top of the teeth 1 and toward the inside of the bucket 13, as shown in Figure 5.

Preferably, the spline 87A is tapered only on one side of the parting line P7 so as to be formed integrally with the remainder of the key 7.

As shown in Figures 1, 4 and 5, complementary to the spline 87A, the teeth 1 here include a stop notch 24 and a stop notch 25 formed on the edge of the keyhole 19. Preferably, the two notches 24, 25 are arranged in opposite directions to each other in the keyhole 19 about the axis X33. It is desirable that the two notches 24 and 25 rotate in a direction opposite to the D31 direction.

Splines (87A) and notches (24, 25) are used to control the pivot stroke of the key (7) from the insertion direction to the locking direction when the key (7) is received in the sheath portion (5) and itself is received in the tooth holder (3). A rotation stop is formed to limit , and the teeth (1) are accommodated in the tooth holder (3). As shown in Figure 4, when the key 7 is rotated in the insertion direction, the spline 87A stops rotating in a direction directly relative to the notch 24, preventing the key 7 from pivoting beyond the insertion direction. do. As shown in Figure 5, when the key 7 is rotated in the locking direction, the spline 87A comes to a rotational stop in an indirect direction relative to the notch 25, preventing the key 7 from pivoting beyond the locking direction. prevent. Therefore, the pivoting of the key 7 is limited to the insertion direction and the locking direction, and it can only pivot between these two directions.

Preferably, as shown in FIGS. 8 and 9, complementary to the splines 87A, the sheath portion 5 includes a stop notch 58A formed in the end 53 of the sheath portion 5. When the key 7 is in the insertion direction, the spline 87A advantageously comes to a rotational stop in a straight direction relative to the stop notch 58A.

Preferably, the shoulder 85 around axis As can be seen in FIG. 7, the spline 87A protrudes from the shoulder 85 in the axial direction toward the shoulder 86. It is therefore advantageous for the shoulder 85 to protrude radially so as to occupy a sector at least 90 degrees from the spline 87A about axis X72, for example 135 degrees in this example. Therefore, the shoulder 85 forms an axially supported collar for both the rib 23 and the seat 21 in the direction in which the key 7 is extracted, occupying the gap space between the sheath portion 5 and the teeth. , which reduces the risk of clogging due to the introduction of foreign matter when using the wear assembly.

Preferably, the shoulder 85 about axis X72 terminates on the circular opposite side of the spline 87A by a stop notch 87B. The sector described above is described by a shoulder 85 from spline 87A to stop notch 87B about axis X72, here at 135 degrees. Shoulder 85 extends about axis X72 to connect spline 87A to stop notch 87B. Preferably, as can be seen in FIGS. 8 and 9, the sheath portion 5 complementary to the notch 87B includes a stop notch 58B formed at the end 53 of the sheath portion 5. When the key 7 is in the locking direction, the notch 87B advantageously comes to a rotational stop in an indirect direction relative to the stop notch 58B.

Preferably, when the key 7 is received in the sheath portion, the shoulder 85 axially supports the end 53 of the sheath portion 5 in the insertion direction of the key 7. Preferably, this support action occurs at least over the entire surface of the side of the shoulder 85 that is turned towards the side of the sheath 5 when the key is in the locking direction.

The axial contact of the sheath portion 5 and the shoulder 85 and/or the support action of the notch 87B relative to the notch 58B improves the seal between the key 7 and the sheath portion 5, preventing the inflow of foreign substances. prevent.

Preferably, the key 7 includes a disassembly groove 88 as can be seen in FIGS. 1, 3 and 7. The groove 88 can also be seen in Figure 6, shown in dashed lines, where the groove 88 is behind the shoulder 86. A disassembly groove 88 is provided along the bearing end 72. The disintegration groove 88 extends, for example, along a plane perpendicular to the axis X71. That is, the groove 88 is perpendicular to the parting line P7, is crossed by the parting line P7, and is tapered on both sides of the parting line P7. Accordingly, the groove 88 is advantageously formed integrally with the remainder of the key 7 without machining the groove 88 . Advantageously, a disintegration groove 88 is provided between the shoulder 86 and the bearing end 72. That is, the groove 88 is arranged between two shoulders 85 and 86. Groove 88 is concave relative to bearing end 72. For example, grooves 88 connect surfaces 83 together. The groove 88 is narrow enough to accommodate the end of the disassembly tool 14 schematically shown in Figure 1, for example the flat end of a flat screwdriver or crowbar.

In a complementary manner, the teeth 1 preferably comprise a disassembly slot 26 recessed into the edge of the keyhole 19 as shown in FIGS. 1 to 5 . Here, the disassembly slot 26 is provided at the edge of the keyhole 19 in a radial direction opposite to the D31 direction. Axially, the disassembly slot 26 is open towards the outside of the tooth 1 but is closed towards the inside of the tooth 1 .

1 and 4, when the key 7 is received in the sheath portion 5 in the insertion direction, the groove 88 is separated from the bearing seat 21 and is directed in the direction opposite to the direction D31. Conversely, groove 88 opens into slot 26. The disassembly slot 26 guides the flat end of the disassembly tool 14 introduced from the outside of the teeth 1 into the groove 88 below the shoulder 86 when the key 7 is in the insertion direction. Wide enough. The disassembly tool 14 can then reach the groove 88 through the slot 26 and extract the key 7 by sliding it out of the sheath 5 along the axis (1) can be dismantled. Preferably, to extract the key 7, the tool 14 is shaken on the teeth 1 of the slot 26 and the key is pulled out with the tool 14. Therefore, extraction of the key 7 is particularly easy.

As shown in Figures 3 and 5, when the key 7 is received in the sheath 5 in the locking direction, the groove 88 is rotated relative to the bearing seat 21, that is, it opens in the D31 direction, thereby opening D31. rotated in the direction Therefore, the groove 88 is preferably closed by a bearing seat 21 positioned in particular between the faces 22 and against the ribs 23 . This prevents the groove 88 from clogging due to the ingress of foreign substances during use.

The actuator head 74 is configured to engage with the actuator tool 11 shown in FIG. 1 so that the technician pivots the key 7 relative to the tooth holder 3 between the locking direction and the insertion direction to engage the tooth 1. ) can be locked or unlocked. The actuator tool 11 is in the form of a socket having one end complementary to the head 74 for coupling thereto and a standard end, for example a square socket end that can be engaged with a ratchet wrench, bolt machine, or impact screw driver. provided.

The actuator head 74 of the key 7 has an end 72 that opens into the keyhole 19 when the key 7 and the sheath portion are received in the tooth holder 3, as shown in FIGS. 3 to 5. It is formed on the axially opposite side of . Head 74 protrudes from sheath 5 along axis X33.

1 and 3 to 7, the head 74 preferably has an actuator notch 89, a finger portion 90, and a finger portion 91 for rotational actuation by the tool 11. Includes.

The fingers 90 and 91 protrude parallel to the axis X33 and in a direction opposite to the cam 71. Preferably, the fingers 90 and 91 are distributed along the parting line P7 and arranged in opposite directions to each other on both sides of the axis X72. Each finger portion 90, 91 is traversed by a dividing line P7 and may be tapered on both sides of the dividing line P7 to be formed integrally with the remaining portion of the key 7. Radially, fingers 90, 91 are arranged on both sides of the notch 89 and define the boundary between them. Axially the fingers 90, 91 end at the same height along the axis X72.

In the radial direction, the finger portion 90 defines the boundary of the notch 89. The finger portion 90 preferably forms a shoulder 86 on the radial outer side. The finger portion 91 on the radial inner side defines the boundary of the notch 89 on the opposite side of the finger portion 90. At the radially outer side the finger portion 91 forms part of the back portion 84 which has a semi-cylindrical shape.

The notch 89 is centered on axis X72 and is oriented along a plane perpendicular to the joint parting line P7 and has an axis The notch 89 opens parallel to the axis X72 but also opens in both directions radially with respect to the axis X72. In particular, in one of two directions the notch 89 opens along the spline 87A. That is, the notch 89 opens around the head 74 in a direction perpendicular to the dividing line P7, and also opens around the head 74 in the opposite direction. Therefore, the notch 89 crosses the key 7 diametrically. Preferably, parallel to the axis

The notch 89, diametrically penetrating and oriented perpendicular to the parting line P7, is tapered on both sides of the parting line P7 so that it can be formed integrally with the rest of the key without additional machining during forging. In order to ensure that the notch 89 is tapered, preferably each ringer portion 90, 91 forms two inclined flanks on the radial inner side, and each flank is arranged only on one side of the dividing line P7. The different flanks are preferably arranged on different sides. This is especially shown in Figure 6, where four inclined flanks are shown, forming two pairs of flanks diverging on either side of the dividing line P7. Additionally, the notch 89 is particularly deep so that it can still be actuated by the tool 11 even if the head 74 is severely worn during use with the wear assembly.

The head 74 forms part of the back portion 84, providing in particular an external semi-cylindrical shape with the notches 89 centered on the axis X72 and the fingers 91 centered on the axis X72. In that it is coaxial with the axis (X72).

As shown in Figure 1, the notch is tapered to complement the head 74, in particular with the notch 89, while the tool 11 provides two finger portions 111, 112 separated by the notch. It is desirable. In order to couple the rotating tool 11 with the head 74, the finger portion 111 is received in a notch 89 on one side of the dividing line P7 between the two finger portions 90 and 91, and the finger portion 111 (112) is received in the notch (89) on the other side of the dividing line (P7) between the two finger portions (90, 91).

Preferably, as can be seen in FIGS. 1 and 3-7, the fingers 90 and/or the shoulder 86 are oriented radially outward about the axis X72 along the parting line P7. It is shaped like an arrow. As can be seen in Figures 4 and 5, the direction of the arrow visually indicates the direction of the key 7 to the operator. In the locked direction, the arrow points along the D31 direction, indicating that the key (7) ensures the clamping of the tooth (1) along the D31 direction.

Preferably, the notch 89 provides two parts each on either side of the parting line P7 and its depth varies along the axis X72. For example, the notch 89 portion on the spline 87A side is shallower than the notch 89 portion. Accordingly, if the key 7 wears during use, at least the deeper portion of the notch 89 will allow the technician to rotate the key 7 even if other parts of the notch 89 wear out.

In addition, to visually indicate to the technician in which direction the key (7) should be pivoted and/or whether the key (7) should be inserted in the rotational or locking direction, for example teeth (1) and/or teeth The holder 3 can also be embossed with text. For example, a pictogram 40 is formed on the tooth 1 near the keyhole 19.

2, 3 and 9, the plug 9 is designed to block the keyhole 19, covering the head 74 of the key 7 and the end 53 of the sheath 5. The key 7 is in the locking direction and is received in the sheath 5 and itself in the keyway 33.

For this purpose, for example, the plug 9 comprises a base 95 , the circumference of which corresponds to the circumference of the keyhole 19 . Base 95 forms a cover that extends across axis X33 when plug 9 is mounted. Advantageously, the base 95 fits into and closes the disassembly slot 26 and at the same time lifts the plug 9 through the tongue 96, allowing the plug 9 to be removed using the tool 14. It includes a tongue 96 leaving an interstitial space. Parallel to axis X33, the base 95 preferably bears against the head 74, especially the fingers 90, 91.

3 and 10, the head 74, especially the notch 89, is tapered to complement the notch 89, while the plug 9 has two finger portions 111 separated by the notch. It includes two finger portions 97 similar in shape to 112). The two finger portions 97 protrude from the base 95 and are received in the notch 89. One of the fingers 97 is accommodated on one side of the dividing line (P7) between the two finger portions 90 and 91, and the other finger portion 97 is accommodated on one side of the dividing line (P7) between the two finger portions 90 and 91. ) is accommodated in the notch 89 on the other side.

As shown in FIGS. 3 and 10 , the plug 9 advantageously comprises a pin 98 projecting perpendicularly from the base 95 . Preferably, the pin 98 is arranged between the finger portion 97 and the tongue portion 96. Preferably, as shown in Figure 10, pin 98 is in the form of a cylindrical portion centered on axis X72 when plug 9 caps key 7. As shown in Figure 3, pins 98 are complementary to the dorsal portion 84 of the key 7 and bear radially against this dorsal portion 84 when the plug 9 is assembled. Then, the pin 99 fills the space formed in the radial direction between the back portion 84 and the keyhole 19 to prevent clogging due to the inflow of foreign substances when the wear assembly is used.

As shown in FIG. 10 , the plug 9 advantageously comprises a pin 99 projecting perpendicularly from the base 95 . Preferably, the finger portions 97 are arranged between the pins 98 and 99. The pin 99 is complementary to the shoulder 86 in the extension of one of the faces 83 and provides radial support against this shoulder 86 when the plug 9 is assembled. The pin 99 then fills the space formed radially between the shoulder 86 and the keyhole 19 and axially between the seat 21 and the base 95, which causes the ingress of foreign matter during use of the wear assembly. Prevents clogging.

Pins 98, 99, fingers 97 and/or tongue 96 allow plug 9 to be held in place on head 74 by engaging with each other along axis X72. In this case, as shown in FIG. 10 , notches are provided, for example in the parts where the pins 98 , 99 are brought into contact with the key 7 , to ensure this interlocking.

In the example shown, the sheath portion 5 and the key 7 are shown to be inserted from the right side of the tooth 1 and the tooth holder 3. Alternatively, the sheath portion 5 and the key 7 may be provided to be inserted symmetrically in opposite directions from the left.

Any feature described above for one embodiment or variant may be implemented for other embodiments and variants described above to the extent technically feasible.

1: tooth 3: tooth holder
5: sheath 7: key
11: Actuator tool 13: Bucket
14: Disassembly tool

Claims (10)

A wear assembly for a bucket (13) of an extraction or working machine, said wear assembly comprising:
- a tooth holder (3) attached to the bucket (13) and comprising a keyway (33) traversed by the keyway axis (X33);
- A tooth (1) to be seated in the tooth holder (3) along the seating direction (D31); and
- a keying device, wherein the keying device:
· A sheath portion (5) including a housing duct (52) and an outer wall (51), wherein the sheath portion is accommodated in a keyway (33) by the outer wall (51), and the sheath portion is aligned with the keyway axis by the outer wall (51). a sheath portion (5) fixed to rotate about (X33) with respect to the tooth holder (3);
· A key (7) configured to be accommodated in the housing duct (52) so as to be pivotably rotatable with respect to the sheath portion (5), wherein the key (7) includes,
an insertion direction, such that the key (7) can be slid into the housing duct (52) while the sheath (5) is received in the keyway (33); and
While the sheath portion 5 is received in the key groove 33, the keying device is operated by a key 7 supported against a bearing seat 21 belonging to the tooth 1 in the seating direction D31 under the action of the key, and a locking direction that clamps the teeth (1) against the tooth holder (3) along the seating direction (D31) by the sheath portion (5) supported against the keyway (33) in the opposite direction;
Pivot rotatable between keys (7);
In the wear assembly,
- the key (7) is integral and comprises a bearing cam (71) and a bearing end (72) formed in one piece;
- the support of the key 7 relative to the bearing seat 21 is achieved by supporting the bearing end 72 directly on the bearing seat 21 along the seating direction D31,
- Wear assembly, characterized in that the support of the sheath portion (5) relative to the keyway (33) is achieved by supporting the bearing cam (71) relative to the housing duct (52) in a direction opposite to the seating direction (D31). According to paragraph 1,
- The sheath portion 5 is integrally formed, and the outer wall 51 and the housing duct 52 are formed integrally;
- the support of the bearing cam 71 relative to the housing duct 52 is achieved without an intermediate part between the key 7 and the sheath 5;
- Wear assembly, characterized in that the housing duct (52) is preferably coated with a lubricant. According to any one of the preceding claims,
- The bearing seat 21 includes two primary surfaces 22, each primary surface 22 being inclinedly oriented and rotating in a direction opposite to the seating direction D31 towards the other primary surface 22. become,
- The bearing end 72 comprises two secondary faces 83, the bearing end 72 is supported against the bearing seat 21, and the bearing end 72 is positioned between the primary faces 22. A wear assembly wherein each secondary face (83) is supported against one of the primary faces (22). According to any one of the preceding claims,
- the teeth (1) include retaining ribs (23);
- The key 7 includes two radial shoulders 85, 86, which are formed integrally with the bearing end 72, and the key 7 is received in the housing duct 52 and the sheath 5. ‹š is accommodated in the keyway (33),
When the key 7 is in the locking direction to secure the key 7 against the teeth 1 parallel to the keyway axis capture,
Wear assembly, characterized in that the key (7) disengages from the retaining rib (23) when it is in the insertion direction. According to any one of the preceding claims,
The key (7) and the tooth (1) include a rotation stop (24, 25, 87A), the rotation stop being positioned in the insertion direction of the key (7) to limit the pivot rotation of the key (7) with respect to the insertion position. A wear assembly, characterized in that it comes to a rotational stop when the key (7) is in the locking direction to limit pivot rotation of the key (7) with respect to the locking direction. According to any one of the preceding claims,
- the key (7) includes a disassembly groove (88) provided along the bearing end (72);
- When the sheath 5 is received in the keyway 33 and the key is received in the housing duct 52, the disassembly groove 88 is:
When the key (7) is in the insertion direction, it is separated from the bearing seat (21) so that the key (7) can be extracted from the housing duct (52) by inserting the disassembly tool (14) into the disassembly groove (88);
Wear assembly, characterized in that the key (7) is made to rotate towards the bearing seat (21) when it is in the locking direction. According to any one of the preceding claims,
The key 7 defines the plane of the parting line P7 across the bearing cam 71 and the bearing end 72, and the bearing cam 71 and the bearing end 72 are on either side of the parting line P7. A wear assembly characterized by being tapered. In clause 7,
- The key 7 includes an actuator head 74 adapted to engage with an actuator tool 11 to actuate the key 7 by pivoting between the insertion direction and the locking direction, the actuator head 74 being mounted on a bearing. It is formed integrally with the cam 71 and the bearing end 72, and protrudes out of the sheath 5 when the key 7 is accommodated in the housing duct 52.
- A wear assembly characterized in that the actuator head (74) is tapered on both sides of the parting line (P7). According to clause 8,
To be coupled with the actuator tool 11, the actuator head 74 includes an actuating notch 89 and two finger portions 90, 91, the finger portions being configured to demarcate the actuating notch 89. arranged on both sides of the wear assembly, characterized in that the actuating notch (89) and the two ringers (90, 91) are crossed by a parting line (P7) and are tapered on both sides of the parting line (P7). According to any one of the preceding claims,
- The tooth 1 includes a keyhole 19 through which the keyway 33 opens when the tooth 1 is received in the tooth holder 3, and the bearing seat 21 is formed at the edge of the keyway 33. ;
- The wear assembly adds a plug (9) which is configured in the keyhole (19) by covering the keying device while the sheath portion (5) is received in the keyway (33) and the key is received in the housing duct (52) in the locking direction. A wear assembly comprising: