Excavator bucket tooth

Abstract

The invention provides an excavator bucket tooth, and belongs to the technical field of machinery. Comprising a tooth holder which is provided with an inserting convex part, the outer side wall of the inserting convex part is at least provided with two abutting surfaces which are symmetrically arranged, and the planes where the abutting surfaces are located are parallel to each other; an insertion cavity is formed in the bucket tooth main body, and at least two butt joint surfaces are arranged on the inner cavity wall of the insertion cavity; and when the insertion convex parts are inserted into the insertion cavities, the abutting surfaces are in abutting connection with the corresponding butt joint surfaces or are in clearance fit with the corresponding butt joint surfaces. The method has the advantage that the dimensional tolerance of the parallel planes is easy to control and detect in the machining process. By strictly controlling the width of the inserting convex part and the inner width of the inserting cavity, it can be ensured that the fit clearance between the bucket tooth body and the tooth holder is kept within a small preset range, and the situation that the clearance is too large or too small due to machining errors is avoided. When an excavator carries out high-strength excavation operation, bucket teeth are subjected to violent impact and alternating load.

Description

Technical Field

[0001] This invention belongs to the field of mechanical technology, and in particular relates to an excavator bucket tooth. Background Technology

[0002] Existing excavator bucket teeth typically use a tooth holder that interlocks with the tooth body and is secured by a transverse locking pin. However, in traditional structures, the interlocking protrusion of the tooth holder and the interlocking cavity of the tooth body often use a curved or conical surface fit. This curved or conical surface fit makes it difficult to precisely control coaxiality and diameter tolerances during machining, and is highly susceptible to irregular gaps after assembly due to casting or forging errors.

[0003] In high-intensity excavation operations, intense impact loads and alternating stresses cause the bucket teeth to oscillate, rotate, and deflect in multiple degrees of freedom on the tooth base. Because the arc surface lacks effective geometric constraints in the tangential direction, this micro-amplitude, high-frequency relative motion not only generates noise but also accelerates wear on the mating surfaces, leading to further widening of the clearance and creating a vicious cycle. More seriously, the loosening of the mating surfaces prevents the effective transmission of enormous shear forces and bending moments through the contact surfaces, instead concentrating them on the locking pin. This causes the locking pin to prematurely fatigue fracture or plastic deformation, posing a safety hazard of bucket teeth falling off. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a bucket tooth with a securely assembled body and tooth base.

[0005] The objective of this invention can be achieved through the following technical solution: an excavator bucket tooth, comprising: The tooth base has an insertion protrusion thereon, and at least two symmetrically arranged abutment surfaces are provided on the outer side wall of the insertion protrusion, and the planes in which the abutment surfaces are located are parallel to each other; the main body of the bucket tooth has an insertion cavity inside, and at least two mating surfaces are provided on the inner wall of the insertion cavity; wherein, when the insertion protrusion is inserted into the insertion cavity, the abutment surface abuts or gap-fits with the corresponding mating surface.

[0006] In one type of excavator bucket tooth described above, multiple contact surfaces are connected end to end to form an annular surface.

[0007] In the above-mentioned excavator bucket teeth, the cross-section of the insertion protrusion gradually shrinks inward toward the insertion direction of the tooth seat, and the abutment surfaces are respectively provided on the insertion protrusion at one end near the tooth seat and at the other end away from the tooth seat.

[0008] In the above-mentioned excavator bucket teeth, one of the insertion protrusion and the insertion cavity is provided with a limiting recess, and the other is provided with a limiting protrusion. The limiting recess can be inserted and fixed with the limiting protrusion.

[0009] In the aforementioned excavator bucket tooth, the insertion protrusion is provided with a slot, the bucket tooth is provided with a through locking hole, and a pin is detachably provided inside the insertion. When the pin is fixed in the slot, the end of the pin extends into the locking hole. A movable abutment is provided on the side of the pin, and a deformable member capable of deformation is provided between the movable abutment and the pin. When the pin is fixed inside the pin, the movable abutment abuts against the wall of the locking hole.

[0010] In one of the excavator bucket teeth described above, the end of the pin is provided with a locking part. The locking part is rotatable relative to the pin and has a first working position and a second working position. When the locking part is in the first working position, the locking part is located in the axial projection area of ​​the end of the pin. When the locking part is in the second working position, at least a portion of the locking part protrudes from the axial projection area of ​​the end of the pin and abuts against the insertion protrusion or the bucket tooth.

[0011] In the excavator bucket teeth described above, as the linear distance between the movable abutment and the locking part increases, the linear distance between the outer side of the movable abutment and the pin axis also increases.

[0012] In the above-mentioned excavator bucket teeth, the pin is provided with a mounting hole, a limit pin is provided in the mounting hole, a limit post is fixedly provided on the locking part, the limit post is inserted into the mounting hole and can rotate relative to the mounting hole, at least two positioning holes are provided at intervals on the outer peripheral surface of the limit post, and the positioning pin is inserted into one of the positioning holes.

[0013] In one of the excavator bucket teeth described above, a limiting ring groove is formed on the outer circumferential surface of the limiting post, a positioning pin is fixed in the mounting hole, and the end of the limiting pin is located in the limiting ring groove.

[0014] In the above-mentioned excavator bucket tooth, the insertion protrusion is provided with a slot, the bucket tooth is provided with a through locking hole, a pin is detachably provided in the insertion, at least one outer peripheral surface of the pin is a conical surface, and a locking washer is detachably provided at the small diameter end of the pin. When the pin is fixed in the slot, the locking washer abuts against the insertion protrusion or the main body of the bucket tooth.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) During machining, the dimensional tolerances of parallel planes (i.e., the distance between the two planes) are very easy to control and inspect. By strictly controlling the width of the insertion protrusion and the inner width of the insertion cavity, it can be ensured that the fit clearance between the bucket tooth body and the tooth seat is kept within a small preset range, avoiding excessive or insufficient clearance caused by machining errors. When the excavator is performing high-intensity digging operations, the bucket teeth will be subjected to severe impacts and alternating loads; (2) The parallel planar contact structure restricts the rotational freedom of the bucket tooth body relative to the tooth seat in the horizontal direction. Even with a small assembly gap, the bucket tooth body cannot deflect or wobble significantly due to the planar contact. This planar constraint makes the connection between the bucket tooth body and the tooth seat more stable, significantly reducing the relative displacement and impact vibration during operation, thereby reducing the shear load on the locking pin and extending the service life of the bucket tooth and tooth seat. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the bucket teeth; Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure; Figure 3 This is a schematic diagram of the three-dimensional structure of the tooth holder; Figure 4 yes Figure 3 A schematic diagram of the side view structure; Figure 5 This is a three-dimensional structural diagram of the bucket teeth; Figure 6 This is a three-dimensional structural diagram of the latch; Figure 7 This is a schematic diagram of the assembly of the locking part inside the latch; Figure 8 This is a schematic diagram showing the state of the locking part when it is in the first working position; Figure 9 This is a schematic diagram showing the state of the locking part when it is in the second working position; Figure 10 This is a schematic diagram of another implementation of the latch; Figure 11 yes Figure 10 A schematic diagram showing the usage status of the latch.

[0017] In the diagram, 100 is the tooth base; 101 is the insertion protrusion; 102 is the abutment surface; 103 is the limiting protrusion; 104 is the slot; 200 is the main body of the bucket tooth; 201 is the insertion cavity; 202 is the mating surface; 203 is the limiting recess; 204 is the locking hole; 300 is the pin; 301 is the movable abutment part; 302 is the deformable part; 303 is the deformation cavity; 304 is the locking part; 306 is the limiting post; 307 is the positioning hole; 308 is the limiting pin; 309 is the limiting ring groove; 310 is the positioning pin; 311 is the locking washer; and 312 is the connecting screw. Detailed Implementation

[0018] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0019] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0020] like Figures 1-9 As shown, this embodiment provides an excavator bucket tooth, including a tooth base 100 and a tooth body 200.

[0021] The front end of the toothed seat 100 extends to form an insertion protrusion 101. An abutment surface 102 is provided on the outer wall of the insertion protrusion 101. There are at least two abutment surfaces 102, and they are symmetrically arranged about the central axis of the insertion protrusion 101. Crucially, both abutment surfaces 102 are flat planes, and the planes they lie on are parallel to each other. In other words, in a cross-section perpendicular to the insertion direction, the abutment surfaces 102 on both sides of the insertion protrusion 101 present a parallel straight line segment structure.

[0022] The hollow interior of the bucket tooth body 200 forms an insertion cavity 201 to accommodate the insertion protrusion 101. On the inner wall of the insertion cavity 201, corresponding to the abutment surface 102, mating surfaces 202 are provided. Similarly, the mating surfaces 202 are symmetrically arranged, are flat planes, and are parallel to each other. The distance between the two mating surfaces 202 is designed to be slightly greater than or equal to the distance between the two abutment surfaces 102 to allow for assembly tolerances.

[0023] During assembly, the main body 200 of the bucket tooth is fitted onto the tooth base 100, so that the insertion protrusion 101 is inserted into the insertion cavity 201. At this time, the abutment surface 102 on the insertion protrusion 101 corresponds to the mating surface 202 in the insertion cavity 201.

[0024] Because both the contact surface 102 and the mating surface 202 are designed as parallel planes, they form a surface contact or a uniform clearance fit during mating. This structure has significant advantages over traditional arc surface mating or non-parallel surface mating: During machining, the dimensional tolerances of parallel planes (i.e., the distance between the two planes) are easily controlled and inspected. By strictly controlling the width of the insertion protrusion 101 and the inner width of the insertion cavity 201, it can be ensured that the fit clearance between the bucket tooth body 200 and the tooth holder 100 is kept within a small preset range, avoiding excessively large or small clearances caused by machining errors. When the excavator is performing high-intensity digging operations, the bucket teeth are subjected to severe impacts and alternating loads. If a curved surface fit is used, the bucket teeth are prone to multi-degree-of-freedom oscillation or rotation on the tooth holder 100, leading to loosening of the connection. Moreover, the parallel planar abutment structure restricts the rotational freedom of the bucket tooth body 200 relative to the tooth holder 100 in the horizontal direction. Even if there is a small assembly gap, the bucket tooth body 200 cannot experience large-scale deflection or wobbling due to the planar abutment. This planar limiting mechanism makes the connection between the bucket tooth body 200 and the tooth seat 100 more stable, significantly reducing relative displacement and impact vibration during operation, thereby reducing the shear load on the locking pin and extending the service life of the bucket tooth and tooth seat 100.

[0025] The outer wall of the insertion protrusion 101 is formed by connecting multiple planes end to end, thus creating a closed annular surface (or polygonal cylindrical surface). As shown in the figure, in one specific embodiment, there are four abutment surfaces 102. Two abutment surfaces 102 are located on parallel planes, and the other two abutment surfaces 102 are located on parallel planes. Adjacent abutment surfaces 102 are not directly connected at sharp angles, but rather smoothly connected through a transition surface. The transition surface can be a chamfered surface or a rounded surface, its function being to eliminate stress concentration and facilitate assembly guidance.

[0026] Because the outer periphery of the insertion protrusion 101 is surrounded by multiple sets of parallel planes (abutment surfaces 102), when it mates with the insertion cavity 201 of the bucket tooth body 200, a planar fit relationship is formed in multiple directions (e.g., front-back and left-right directions). Regardless of the horizontal direction from which the load comes, at least one set of parallel planes (abutment surfaces 102 and mating surfaces 202) always bears the main abutment function, restricting the radial rotation and swaying of the bucket tooth body 200 relative to the tooth seat 100. This multi-plane constraint method greatly improves the rigidity of the connection and effectively prevents excessive shaking of the bucket tooth during operation.

[0027] The front end of the tooth base 100 extends to form an insertion protrusion 101. To facilitate the installation of the bucket tooth body 200, the insertion protrusion 101 has a special tapered design: along the insertion direction of the insertion protrusion 101 (i.e., from the root to the end of the insertion protrusion 101), the cross-sectional dimensions of the insertion protrusion 101 gradually taper inward. In other words, the insertion protrusion 101 as a whole presents a frustum-shaped or tapered polyhedral structure, with a larger cross-section at the end near the root of the tooth base 100 and a smaller cross-section at the end away from the tooth base 100.

[0028] When the worker places the bucket tooth body 200 onto the tooth holder 100, the constricted end first contacts and enters the insertion cavity 201, acting as a natural guide wedge. This tapered design, smaller at the front and larger at the back, significantly reduces the difficulty of alignment during assembly. Even if there is a slight initial positional deviation, it can be automatically corrected during insertion, allowing the bucket tooth body 200 to slide smoothly into place, greatly improving the efficiency of on-site bucket tooth replacement.

[0029] Although a contraction design is adopted to facilitate assembly, this embodiment ensures connection rigidity after assembly by providing parallel abutment surfaces 102 at both ends of the insertion protrusion 101, near and away from the root. When the bucket tooth body 200 is fully installed, the abutment surface 102 at the larger end fits tightly against the corresponding mating surface 202, bearing the main digging load and resisting bending moment, thus limiting the swaying of the bucket tooth root. The abutment surface 102 at the smaller end provides a second constraint, limiting the radial displacement of the bucket tooth tip.

[0030] In this embodiment, the limiting protrusion 103 is integrally formed on the side wall surface of the insertion protrusion 101 (preferably located on the side or top surface where the force is greater), and has a trapezoidal or rectangular block structure. Correspondingly, a limiting recess 203 (i.e., a limiting groove) with a complementary shape is provided on the inner wall of the insertion cavity 201. When the bucket tooth body is pushed in axially and installed in place, the limiting protrusion 103 is precisely embedded in the limiting recess 203, realizing the insertion and fixation of the two.

[0031] The purpose of the matching structure of the limiting protrusion 103 and the limiting recess 203 is to further prevent wobbling between the tooth seat 100 and the tooth body. By introducing the interlocking mechanism of the limiting protrusion 103 and the limiting recess 203, a secondary rigid constraint independent of the contact surface 102 is constructed.

[0032] Furthermore, a slot 104 is formed on the insertion protrusion 101, extending perpendicular to the insertion direction. A through locking hole 204 is formed on the bucket tooth body. When the bucket tooth is installed in place, the slot 104 and the locking hole 204 are coaxially aligned. A pin 300 is detachably disposed in the slot 104. When the pin 300 is fully pushed in and fixed in the slot 104, its end extends into the locking hole 204, thereby preventing the bucket tooth body from falling off the tooth seat 100 and achieving axial locking.

[0033] To address the issue of traditional rigid pins 300 being prone to breakage under shaking and impact, this embodiment includes a movable abutment portion 301 (made of rigid material) on the side of the pin 300 (including the portion extending into the locking hole 204). This movable abutment portion 301 is not rigidly integrated with the main body of the pin 300; a deformable member 302 is provided between the movable abutment portion 301 and the main body of the pin 300. This allows the movable abutment portion 301 to have a slight movement capability relative to the main body of the pin 300. The deformable member 302 can be a high-strength spring, a rubber pad, a polyurethane elastomer, or a thin metal sheet with a specific yield strength. One end of the deformable member 302 abuts against the back of the movable abutment portion 301, and the other end abuts against the limiting groove of the main body of the pin 300.

[0034] When the pin 300 is fixed in the slot 104 and the teeth are in the normal installation state, under the pre-tightening force of the deformable part 302, the movable abutment part 301 pops outward and tightly abuts against the inner wall of the locking hole 204, eliminating radial clearance. Because the movable abutment part 301 can slightly retract under the action of the deformable part 302, it avoids a direct "hard-on-hard" contact between the wall of the locking hole 204 and the main body of the pin 300. The movable abutment part 301 can adapt to the relative movement of the hole wall through its own slight displacement, always maintaining a close but not overloaded state.

[0035] Specifically, such as Figure 2 As shown, the deformable component 302 includes a deformable block capable of deformation, and multiple deformation cavities 303 are spaced apart on the side of the deformable block that abuts against the movable contact portion 301. This effectively interrupts the stress transmission path, distributing the concentrated load to multiple sections of the deformable block. This not only improves the overall load-bearing capacity of the deformable block but also significantly delays the initiation and propagation of fatigue cracks in the material. By adjusting the number, spacing, aperture size, and arrangement of the deformation cavities 303, the effective compression stroke and stiffness coefficient of the deformable block can be precisely controlled.

[0036] like Figures 6-9 As shown, based on the above embodiment, the end locking structure of the pin 300 is further optimized to prevent the pin 300 from accidentally coming out during severe vibration.

[0037] A locking part 304 is provided at the end of the pin 300 (i.e., the exposed end or the concealed end after it extends into the locking hole 204). The locking part 304 is not rigidly fixed to the pin 300, but can rotate relative to the pin 300 via a pivot, hinge, or elastic torsion spring structure. The locking part 304 has two working positions. When the locking part 304 is in the first working position, its overall outline is completely located within the axial projection area of ​​the end of the pin 300. At this time, the outer diameter of the locking part 304 is not greater than (or slightly smaller than) the outer diameter of the body of the pin 300. This state allows the pin 300 to pass smoothly through the locking hole 204 on the bucket tooth and the slot 104 on the tooth seat 100, facilitating installation and removal without interference.

[0038] When the locking part 304 is in the second working position, at least a portion of it protrudes beyond the axial projection area of ​​the end of the pin 300. The locking part 304 rotates relative to the axis of the pin 300, forming a "stop" or "wing" with a diameter larger than the diameter of the locking hole 204 or the width of the slot 104. The protruding portion directly abuts against the surface of the insertion protrusion 101 (such as at the entrance of the slot 104) or the outer surface of the tooth body, forming a physical barrier.

[0039] During excavator operation, even if a strong reverse impact force attempts to push the pin 300 outward, it will be firmly blocked outside the hole because the locking part 304 is in the second working position and the size of its protruding part is larger than the size of the through hole. This mechanical interference prevents the pin 300 from retracting axially, thus ensuring the absolute reliability of the locking.

[0040] In this embodiment, the pin 300 is not a traditional cylinder of uniform diameter, but rather is frustoconical in shape (or has a conical outer contour) either entirely or partially. A movable abutment portion 301 is located at one end of the pin 300 (the end that is finally inserted into the locking hole 204). A locking portion 304 is located at the other end of the pin 300. This locking portion 304 can rotate or fold relative to the main body of the pin 300, having two states: retracted (first working position) and extended (second working position). As the linear distance between the movable abutment portion 301 and the locking portion 304 increases (i.e., extending from one end to the other), the linear distance between the outer surface of the movable abutment portion 301 (or the outer circumferential surface of the pin 300 where it is located) and the axis of the pin 300 gradually increases.

[0041] The operator places the locking part 304 in the retracted state (minimum outer diameter). The small-diameter end of the pin 300 is aligned with the locking hole 204 of the tooth or the slot 104 of the tooth seat 100 and pushed in. As the insertion depth increases, the larger outer diameter portion of the pin 300 gradually enters the hole. The movable abutment part 301 at the larger diameter end then enters the hole and contacts the hole wall. Due to the taper, further insertion of the pin 300 forces the deformable part 302 to undergo radial compression. At this point, the deformable part 302 generates a reaction force, filling the microscopic gap between the pin 300 and the hole wall, providing an initial anti-shake buffering effect and eliminating any looseness in the fit. The operator continues to push the pin 300 in until the predetermined depth (fully installed position) is reached. At this point, the small-diameter portion of the pin 300 (i.e., the area where the locking part 304 is located) has reached the opening of the locking hole 204 or a specific limiting step. Because the pin 300 is tapered and its large-diameter end is deeply embedded in the hole, the diameter of the large-diameter section of the pin 300 (where the movable abutment part 301 is located) is greater than or equal to the effective diameter of the hole, forming a tight interference fit or stepped abutment. This tapered fit prevents the pin 300 from moving further into the hole. Any inward thrust will cause a larger diameter tapered surface to be squeezed into the hole, generating enormous friction and wedging force. Therefore, the tapered structure itself naturally locks the pin 300's freedom of movement in the "large-diameter end direction." If the pin 300 wants to disengage, it can only exit from the "small-diameter end direction." At this point, it is only necessary to prevent the pin 300 from exiting from the small-diameter end to achieve complete fixation. The operator switches the locking part 304 located at the small-diameter end to the unfolded state (second working position). In this state, the effective outer diameter of the locking part 304 is significantly increased, making it larger than the effective diameter of the locking hole 204, or precisely wedged at the entrance of the slot 104 to form a shoulder. The unfolded locking part 304 directly abuts against the outer surface of the bucket tooth or tooth seat 100, completely blocking the path of the pin 300 to be pulled outward.

[0042] In summary, by simply setting a movable locking part 304 at the small diameter end to prevent it from being pulled outward, the pin 300 can be absolutely fixed in both axial directions.

[0043] Furthermore, an axial mounting hole is formed inside the end of the pin 300. A limiting post 306 is fixedly provided on the inner side of the locking part 304 (i.e., the end facing the pin 300). The shape of the limiting post 306 is adapted to the mounting hole (usually cylindrical) and is inserted into the mounting hole.

[0044] The limiting post 306 and the mounting hole are fitted with a clearance fit or a bearing fit, allowing the limiting post 306 (together with the locking part 304) to rotate freely relative to the pin 300 and the mounting hole. At least two positioning holes 307 (preferably two or more evenly distributed) are spaced apart along the circumferential direction on the outer circumferential surface of the limiting post 306. These positioning holes 307 can be blind holes.

[0045] A limiting pin 308 is installed inside the mounting hole. The end of the limiting pin 308 (i.e., the end that contacts the positioning hole 307) has a certain degree of elasticity. The limiting pin 308 consists of a rigid rod and an elastic ball head at the end (such as a steel ball + small spring); or the limiting pin 308 itself is a rigid pin pushed by a compression spring. This elastic design gives the limiting pin 308 the characteristics of "automatic reset" and "disengagement". When sufficient rotational torque is applied, the elastic end can be compressed or displaced, thereby disengaging from the current positioning hole 307; once the external force is removed and aligned with the new positioning hole 307, the elastic end will automatically spring into the new positioning hole 307. Utilizing the elasticity of the limiting pin 308, a convenient operation of "opening with a forceful turn and locking with a release" is achieved. Unlike traditional solutions, there is no need to use a wrench to remove bolts or knock cotter pins, greatly improving the efficiency of on-site bucket tooth replacement.

[0046] Furthermore, to ensure the axial stability of the limiting post 306 during rotation and prevent it from accidentally dislodging or shifting, a recessed limiting annular groove 309 is formed circumferentially on the outer circumferential surface of the limiting post 306. This annular groove is located at the center of the limiting post 306 or at a specific axial position, and its cross-sectional shape can be rectangular, trapezoidal, or semi-circular. A locating pin 310 (referring to a pin that acts as an axial stop) is fixedly installed on the wall of the mounting hole. The inner end of the locating pin 310 extends into the mounting hole and is precisely located within the limiting annular groove 309. A small radial gap is left between the end of the locating pin 310 and the bottom and sidewall of the limiting annular groove 309 to ensure that rotation is not obstructed; however, axially, the locating pin 310 is engaged between the upper and lower steps of the annular groove. Since the limiting annular groove 309 is a continuous groove surrounding the limiting post 306, when the limiting post 306 rotates relative to the mounting hole, the fixed locating pin 310 always slides within the annular groove. The continuity of the annular groove ensures that there are no dead angles or interference during the rotation process. When the limiting post 306 is subjected to an outward pulling force or an inward pushing force, the inner step of the limiting annular groove 309 will abut against the end of the positioning pin 310, preventing it from moving outward.

[0047] like Figures 10-11 As shown, in another embodiment of the pin 300, at least one outer peripheral surface (preferably the entire outer contour) of the pin 300 is designed as a conical surface. Specifically, the pin 300 has a small-diameter end and a large-diameter end, with its outer diameter gradually increasing from the small-diameter end to the large-diameter end. This conical design enables the pin 300 to have a self-centering and wedging function during installation: when the pin 300 is pushed in from the small-diameter end, the initial resistance is small; as the insertion depth increases, the conical surface fits tightly against the inner wall of the locking hole 204 and the slot 104, generating radial expansion force, thereby eliminating the fit clearance and achieving initial anti-loosening and buffering.

[0048] To achieve reliable axial locking of the pin 300 and prevent it from dislodging during vibration, this embodiment provides a dedicated locking assembly at the small-diameter end of the pin 300. This assembly includes a locking washer 311 and a connecting screw 312. A threaded blind hole (or through hole) is axially formed inside the small-diameter end of the pin 300. The axis of this threaded blind hole coincides with the central axis of the pin 300. The locking washer 311 is disc-shaped, square-plate-shaped, or arc-shaped, with a through hole at its center matching the aforementioned threaded blind hole. The outer contour dimensions (diameter or width) of the locking washer 311 are designed to be larger than the opening cross-sectional dimensions of the slot 104, ensuring that it cannot pass through the hole into the interior. An operator uses a tool (such as a wrench or screwdriver) to screw in the connecting screw 312. The connecting screw 312 passes through the through hole of the locking washer 311 and is screwed into the threaded blind hole of the pin 300. As the connecting screw 312 is tightened, the screw head (or the flange face on the screw) gradually presses against the locking washer 311. When sufficient torque is applied, the locking washer 311 is pressed tightly against the outer surface of the insertion protrusion 101 or the outer surface of the tooth body 200.

[0049] It should be noted that in this invention, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0050] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0051] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. An excavator bucket tooth, characterized in that, include: A toothed seat is provided with a plugging protrusion. At least two symmetrically arranged abutting surfaces are provided on the outer side wall of the plugging protrusion, and the planes on which the abutting surfaces are located are parallel to each other. The main body of the bucket tooth has an insertion cavity inside, and at least two mating surfaces are provided on the inner wall of the insertion cavity; When the insertion protrusion is inserted into the insertion cavity, the abutting surface abuts or gap-fits with the corresponding mating surface.

2. The excavator bucket tooth according to claim 1, characterized in that, Multiple contact surfaces are connected end to end to form an annular surface.

3. The excavator bucket tooth according to claim 1, characterized in that, In the direction of insertion of the toothed seat, the cross-section of the insertion protrusion gradually shrinks inward, and the abutment surfaces are respectively provided on the insertion protrusion at one end near the toothed seat and at the other end away from the toothed seat.

4. The excavator bucket tooth according to claim 1, characterized in that, One of the insertion protrusion and the insertion cavity is provided with a limiting recess, and the other is provided with a limiting protrusion. The limiting recess can be inserted and fixed with the limiting protrusion.

5. The excavator bucket tooth according to claim 1, characterized in that, The insertion protrusion is provided with a slot, and the bucket tooth is provided with a through locking hole. A pin is detachably provided inside the insertion. When the pin is fixed in the slot, the end of the pin extends into the locking hole. A movable abutment is provided on the side of the pin, and a deformable member that can deform is provided between the movable abutment and the pin. When the pin is fixed in the slot, the movable abutment abuts against the wall of the locking hole.

6. The excavator bucket tooth according to claim 5, characterized in that, The end of the pin is provided with a locking part, the locking part being rotatable relative to the pin, the locking part having a first working position and a second working position. When the locking part is in the first working position, the locking part is located within the axial projection area of ​​the end of the pin; while when the locking part is in the second working position, at least a portion of the locking part protrudes beyond the axial projection area of ​​the end of the pin and abuts against the insertion protrusion or the main body of the tooth.

7. The excavator bucket tooth according to claim 6, characterized in that, As the linear distance between the movable abutment and the locking part increases, the linear distance between the outer side of the movable abutment and the axis of the pin also increases.

8. The excavator bucket tooth according to claim 6, characterized in that, The pin is provided with a mounting hole, and a limit pin is provided in the mounting hole. A limit post is fixedly provided on the locking part. The limit post is inserted into the mounting hole and can rotate relative to the mounting hole. At least two positioning holes are provided at intervals on the outer circumferential surface of the limit post, and the positioning pin is inserted into one of the positioning holes.

9. The excavator bucket tooth according to claim 8, characterized in that, A limiting ring groove is formed on the outer circumferential surface of the limiting post, and a positioning pin is fixed in the mounting hole, with the end of the limiting pin located in the limiting ring groove.

10. The excavator bucket tooth according to claim 1, characterized in that, The insertion protrusion is provided with a slot, the bucket tooth is provided with a through locking hole, and a pin is detachably provided inside the insertion. At least one outer peripheral surface of the pin is a conical surface, and a locking washer is detachably provided at the small diameter end of the pin. When the pin is fixed in the slot, the locking washer abuts against the insertion protrusion or the main body of the bucket tooth.

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