Lock pin and fixing structure for tooth member equipped with same

Abstract

To provide a lock pin that can more easily fix a tooth member and an adapter. [Solution] The lock pin 10 comprises a main body 11 having an engaging portion 12 that engages with a retainer 40, two support surface portions 14a, 14b formed on the side of the main body 11 opposite the engaging portion 12 and consisting of a first support surface portion 14a at the front end in the insertion direction and a second support surface portion 14b at the rear end in the insertion direction, a convex portion 15 disposed between the two support surface portions 14a, 14b and formed on the main body so as to protrude from the two support surface portions 14a, 14b, and a recess 16 disposed between the convex portion 15 and the second support surface portion 14b and capable of accommodating the second inner wall surface portion 36 before the second inner wall surface portion 36 is supported by the second support surface portion 14b.

Description

[Technical Field]

[0001] The present invention relates to a lock pin for fixing a tooth member to an adapter at the tip of a bucket of a shovel machine, and a tooth member fixing structure including the lock pin. [Background technology]

[0002] A plurality of adapters are fixed at a predetermined interval to the tip of the bucket of a shovel machine, and various tooth members are respectively connected to the adapters. The tooth members are excavation tools such as plate-shaped tooth disks or wedge-shaped point teeth. For example, Patent Document 1 describes a method of fixing the tooth members to the adapters using a lock pin and an elastic pin (retainer) that holds the lock pin.

[0003] Here, Fig. 11 is a cross-sectional view showing the positional relationship between a conventional lock pin, tooth member, and adapter. As shown in Fig. 11, a first through hole 112 is formed through a protrusion 111 of an adapter 110, and a retainer 120 is attached to the protrusion 111 so as to be exposed within the first through hole 112. Meanwhile, the tooth member 130 has a recess 131, and second through holes 134 are formed through two opposing portions 133 of the recess 131. When the protrusion 111 and the recess 131 are fitted together, the two second through holes 134 and the first through hole 112 communicate with each other to form an insertion hole 135 into which the lock pin 100 is inserted. In Fig. 11, arrow Z indicates the insertion direction of the lock pin 100.

[0004] The protrusion 111 of the adapter 110 has a first inner wall surface portion 113 that faces the first through hole 112 and faces the retainer 120. On the other hand, the tooth member 130 has two second inner wall surface portions 136 that face the second through hole 134, and the first inner wall surface portion 113 is disposed between these two second inner wall surface portions 136.

[0005] Furthermore, by positioning the first inner wall surface portion 113 recessed relative to the two second inner wall surface portions 136 (to the right in FIG. 11 ), the first inner wall surface portion 113 and the two second inner wall surface portions 136 are arranged in a stepped manner. Thus, the portion near the second inner wall surface portion 136 adjacent to the first inner wall surface portion 113 forms a stepped portion 140 relative to the first inner wall surface portion 113. Due to this stepped configuration of the first inner wall surface portion 113 and the second inner wall surface portion 136, it becomes easier to insert the tip of the lock pin 100 into the insertion hole 135 at the initial stage of insertion of the lock pin 100.

[0006] 11 while receiving a reaction force from the retainer 120, the tip of the lock pin 100, which has been driven into the insertion hole 135, overcomes the lower step 140 in FIG. 11, and the engaging portion 101 of the lock pin 100 engages with the engaging portion 121 of the retainer 120, and the support surface 102 on the opposite side of the engaging portion 101 of the lock pin 100 supports the two second inner wall surface portions 136. In this state, the tooth member 130 and the adapter 110 are fixed by the lock pin 100. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 2016-089412 Summary of the Invention [Problem to be solved by the invention]

[0008] In recent years, tooth components and adapters have been supplied to the market as a wide variety of products. However, these products have problems such as inconsistencies between products made by different manufacturers, and large manufacturing errors even when made by the same manufacturer. As a result, some combinations of tooth components and adapters cannot be secured using conventional lock pins.

[0009] 12 shows the positional relationship between a conventional lock pin, tooth member, and adapter, similar to FIG. 11. As described above, due to misalignment between products or manufacturing errors, the step S between the first inner wall surface portion 113 and the second inner wall surface portion 136 may be relatively large. Here, the step S is the gap between the plane H passing through the two second inner wall surface portions 136 and the plane L passing through the first inner wall surface portion 23.

[0010] 12, when the step S is relatively large, the tip of the lock pin 100 receives a reaction force from the retainer 120 and becomes deeply embedded in the step S, and the tip of the lock pin 100 may become caught on the step portion 140 and be unable to overcome the step portion 140. As a result, it becomes difficult to fix the tooth member 130 and the adapter 110 with the lock pin 100.

[0011] The present invention has been made in view of the above points, and an object of the present invention is to provide a lock pin that can easily fix a tooth member and an adapter together. [Means for solving the problem]

[0012] The lock pin according to the present invention is a lock pin for connecting and fixing an adapter provided at the tip of a bucket of a shovel machine, the adapter having a protruding portion with a first through hole formed therethrough and a retainer attached to the protruding portion so as to protrude into the first through hole, and a tooth member having a recessed portion that fits into the protruding portion and two second through holes formed therein that respectively pass through two opposing portions of the recessed portion.The lock pin is configured to be inserted into an insertion hole that communicates between the two second through holes and the first through hole with the protruding portion and the recessed portion fitted together, and to connect and fix the adapter and the tooth member by engaging with the retainer. The protrusion has a first inner wall surface portion that faces the first through hole and faces the retainer, and the tooth member has two second inner wall surface portions that face the second through hole, and the first inner wall surface portion is arranged between the two second inner wall surface portions and is positioned recessed relative to the two second inner wall surface portions, so that the vicinity of the second inner wall surface portion adjacent to the first inner wall surface portion forms a step portion relative to the first inner wall surface portion.

[0013] The lock pin includes a main body having an engaging portion that engages with the retainer, and two support surface portions formed on the main body on the opposite side of the engaging portion and that individually support the second inner wall surface portion when the tooth member and the adapter are connected and fixed, the two support surface portions being composed of a first support surface portion arranged on the leading end side in the insertion direction of the main body and a second support surface portion arranged on the rear end side in the insertion direction of the main body, and a support surface portion arranged between the two support surface portions. and is arranged only on the tip side in the insertion direction of the main body from the center position in the insertion direction of the main body. a protrusion formed on the main body so as to protrude from the two support surface portions, the protrusion being configured to be able to come into contact with the first inner wall surface portion when the main body is inserted into the insertion hole; and a second support surface portion disposed between the protrusion and the second support surface portion. and is disposed adjacent to the second support surface portion. and a recess formed to be recessed lower than the two support surface portions, the recess being configured to be able to accommodate the second inner wall surface portion before the second inner wall surface portion is supported by the second support surface portion when the main body is inserted into the insertion hole.

[0014] In the above configuration, when the main body of the lock pin is initially inserted into the insertion hole, the tip portion of the main body in the insertion direction comes into contact with the retainer protruding within the first through-hole (i.e., within the insertion hole) and is pressed toward the first inner wall surface portion by the reaction force from the retainer. However, because the convex portion of the main body protrudes beyond the two support surface portions, the convex portion abuts against the first inner wall surface portion and acts as a fulcrum, allowing the first support surface portion on the tip side of the main body to be separated from the first inner wall surface portion.

[0015] Furthermore, before the second support surface portion on the rear end side in the insertion direction of the main body supports the second inner wall surface portion of the tooth member (i.e., before the tip portion of the main body reaches the step portion), the second inner wall surface portion is accommodated in the recess of the main body, which allows the first support surface portion on the tip side of the main body to be even more spaced apart from the first inner wall surface portion with the protrusion as a fulcrum.

[0016] In addition, since the second inner wall surface portion is accommodated in the recess, the reaction force that the main body receives from the retainer is reduced, increasing the degree of freedom in the position of the main body, and the position of the main body can be brought closer to the direction along the insertion hole, making it possible to easily insert the main body deeply into the insertion hole.

[0017] In this way, with the above configuration, the main body can be easily inserted deeply into the insertion hole while the first support surface portion of the main body is largely separated from the first inner wall surface portion, so that the first support surface portion of the main body can easily overcome the step portion relative to the first inner wall surface portion, and the tooth member and the adapter can be easily fixed. 。

[0018] The protrusion is disposed adjacent to the first support surface portion. Ruko It is preferable that:

[0019] According to the above configuration, when the lock pin is inserted, the convex portion abuts against the step portion at the lock pin mounting position where the two support surface portions individually support the second inner wall surface portion, thereby making it possible to hold the lock pin in place at the mounting position and prevent the lock pin from falling off.

[0020] The main body preferably has a flat surface portion disposed between the recessed portion and the protruding portion and formed alongside the first and second support surface portions, thereby ensuring the rigidity of the main body even with the recessed portion.

[0021] In addition, the tooth member fixing structure of the present invention comprises an adapter provided at the tip of the bucket of a shovel machine, a tooth member that fits into the adapter, and the above-mentioned lock pin for connecting and fixing the adapter and the tooth member. [Effects of the Invention]

[0022] According to the present invention, the tip portion of the main body can easily overcome the step portion in the insertion hole formed in the tooth member and adapter that are fitted together, making it possible to easily fix the tooth member and adapter. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 1 is a perspective view showing a bucket of a shovel machine in this embodiment. [Figure 2] FIG. 2 is a perspective view showing the adapter and the tooth member immediately before they are fitted together. [Figure 3] FIG. 3 is a perspective view showing the lock pin according to this embodiment, and the adapter and tooth member fitted together. [Figure 4] FIG. 4 is a cross-sectional view showing the main parts of the adapter and tooth member fitted together. [Figure 5] FIG. 5 is a plan view schematically showing a first through hole and a second through hole that constitute an insertion hole. [Figure 6] FIG. 6 is a side view showing the outer shape of the lock pin. [Figure 7] FIG. 7 is a cross-sectional view showing the adapter and tooth member into which the tip end of the lock pin is inserted. [Figure 8] FIG. 8 is a cross-sectional view of the adapter and the tooth member showing a state in which the tip portion of the lock pin approaches the step portion. [Figure 9] FIG. 9 is a cross-sectional view of the adapter and the tooth member, showing a state in which the recess of the lock pin accommodates the second inner wall surface portion. [Figure 10] FIG. 10 is a cross-sectional view showing a structure for fixing a tooth member using a lock pin. [Figure 11]FIG. 11 is a cross-sectional view showing an adapter and a tooth member into which the tip end of a conventional lock pin is inserted. [Figure 12] FIG. 12 is a cross-sectional view of an adapter and a tooth member showing a state in which the tip of a conventional lock pin is caught on a step portion. DETAILED DESCRIPTION OF THE INVENTION

[0024] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the following embodiments.

[0025] Fig. 1 is a perspective view showing a bucket 5 of a shovel machine (not shown). Fig. 2 is a perspective view showing an adapter 20 and a tooth member 30 immediately before they are fitted together. Fig. 3 is a perspective view showing a lock pin 10 in this embodiment, and the adapter 20 and tooth member 30 fitted together. Fig. 4 is a cross-sectional view showing the main parts of the adapter 20 and tooth member 30 fitted together.

[0026] As shown in Fig. 1, a plurality of adapters 20 are provided at predetermined intervals at the tip of bucket 5 of the excavator machine. As shown in Figs. 1 to 3, the base ends of adapters 20 are fixed to the plate-shaped tip portion of bucket 5 by welding while sandwiching the tip portion. Meanwhile, as shown in Figs. 2 and 4, a protrusion 21 is formed on the tip side of adapter 20.

[0027] In the following description, the tip end side of the adapter 20 (e.g., the left side in FIG. 4) may be referred to as the "front," and the base end side of the adapter 20 (e.g., the right side in FIG. 4) may be referred to as the "rear." Furthermore, the tip portion A of the lock pin 10 in the insertion direction Z may be simply referred to as the tip portion A.

[0028] 2 and 4, a first through-hole 22 is formed through the protruding portion 21. The first through-hole 22 extends in a direction intersecting the protruding direction (forward) of the protruding portion 21, for example, extending in the vertical direction in FIG. 4. A retainer (holding member) 40 is attached to the protruding portion 21 so as to be exposed inside the first through-hole 22. For example, the retainer 40 is disposed in front of the first through-hole 22.

[0029] Tooth member 30 is, for example, a drilling tool such as a plate-shaped tooth disk or a wedge-shaped point tooth. Figures 1 to 3 show a point tooth type tooth member 30 as an example. The tip side of tooth member 30 is a cutting edge 31, and as shown in Figure 4, the base end side of tooth member 30 is formed with a recessed portion 32 into which protrusion 21 of adapter 20 fits.

[0030] The tooth member 30 has two opposing portions 33 that face each other in the recessed portion 32. A second through hole 34 is formed through each of the opposing portions 33. The two second through holes 34 are arranged coaxially and extend in the vertical direction in FIG. 4, for example.

[0031] Then, with the protrusion 21 and the recess 32 fitted together, the two second through holes 34 and the first through hole 22 communicate with each other to form an insertion hole 35. The lock pin 10 is to be inserted into this insertion hole 35.

[0032] 5 is a plan view schematically showing the first through hole 22 and the second through hole 34 that constitute the insertion hole 35. As shown in FIGS. 4 and 5, the protrusion 21 of the adapter 20 has a first inner wall surface portion 23 that faces the first through hole 22 and faces the retainer 40. The first inner wall surface portion 23 is a part of the inner wall surface that defines the first through hole 22 and is an inner wall surface portion that is arranged on the rear side of the first through hole 22.

[0033] On the other hand, the tooth member 30 has second inner wall surface portions 36 which are part of the inner wall surface facing the second through holes 34. The second inner wall surface portions 36 are inner wall surface portions arranged on the rear side of the second through holes 34, and are arranged in each of the two second through holes 34. The first inner wall surface portion 23 is arranged between these two second inner wall surface portions 36. In other words, the two second inner wall surface portions 36 are arranged on both sides of the first inner wall surface portion 23 in the direction in which the insertion hole 35 extends (on both the top and bottom sides in FIG. 4).

[0034] 4 and 5, the first inner wall surface portion 23 is disposed recessed (to the right in FIG. 4) relative to the two second inner wall surface portions 36, so that the first inner wall surface portion 23 and the two second inner wall surface portions 36 are disposed in a stepped manner. That is, the first inner wall surface portion 23 and the two second inner wall surface portions 36 form a concave stepped surface. Thus, a relatively large gap S is generated between a plane H passing through the two second inner wall surface portions 136 and a plane L passing through the first inner wall surface portion 23.

[0035] The portion of the second inner wall surface portion 36 adjacent to the first inner wall surface portion 23 forms a step portion 38 relative to the first inner wall surface portion 23. Gap S is the height of step portion 38. Because the first inner wall surface portion 23 and the second inner wall surface portion 36 have a concave step configuration in this way, even if the retainer 40 protrudes into the insertion hole 35, the tip portion A of the lock pin 10 can be easily inserted into the insertion hole 35 at the beginning of insertion of the lock pin 10.

[0036] The retainer 40 has an elastic portion 41 made of an elastic resin material such as hard rubber, and a plurality of rigid portions 42 held by the elastic portion 41. The rigid portion 42 can be made of, for example, a cylindrical metal material. The axial direction of the rigid portion 42 is perpendicular to the axial direction of the first through hole 22. The plurality of rigid portions 42 are arranged at predetermined intervals, and are embedded in the elastic portion 41 with a portion of each portion exposed.

[0037] The rigid portion 42 exposed from the elastic portion 41 constitutes the engaging portion 43 of the retainer 40 that engages with the lock pin 10. As shown in FIG. 4, the engaging portion 43 has a plurality of arc-shaped cross-sections. The elastic resin material that constitutes the elastic portion 41 fills the inside of the cylindrical rigid portion 42 and solidifies. As a result, the rigid portion 42 and the elastic portion 41 are integrated together.

[0038] Here, Fig. 6 is a side view showing the outer shape of the lock pin 10. Also, Figs. 7 to 9 are cross-sectional views showing the adapter 20 and tooth member 30 into which the lock pin 10 has been inserted. Fig. 10 is a cross-sectional view showing the fixing structure of the tooth member 30 by the lock pin 10. The lock pin 10 is configured to be inserted into the insertion hole 35 and engaged and held by the retainer 40, thereby connecting and fixing the adapter 20 and the tooth member 30.

[0039] As shown in Figure 6, the lock pin 10 has a main body 11 made of a metal material or the like. The main body 11 has an engaging portion 12 that engages with the retainer 40. The engaging portion 12 has a plurality of arc-shaped cross-sections that correspond to the engaging portions 43 of the retainer 40. An arrow-shaped indicator 13 that indicates the insertion direction of the lock pin 10 is formed on the side of the main body 11.

[0040] Two support surface portions 14a, 14b are formed on the side of the main body 11 opposite the engagement portion 12. The two support surface portions 14a, 14b are composed of a first support surface portion 14a arranged at the front end side in the insertion direction Z of the main body 11 and a second support surface portion 14b arranged at the rear end side in the insertion direction of the main body 11. As shown in FIG. 6, the two support surface portions 14a, 14b are arranged to be aligned along a predetermined reference plane M. In addition, a chamfered portion 18 is formed adjacent to the first support surface portion 14a at the front end portion A of the main body 11. The provision of the chamfered portion 18 makes it easier for the front end of the main body 11 to climb over the step portion 38.

[0041] As shown in Figure 10, when the tooth member 30 and the adapter 20 are connected and fixed by the lock pin 10, the two support surface portions 14a, 14b are configured to individually support the second inner wall surface portion 36 of the tooth member 30.

[0042] The main body 11 is formed with a protrusion 15 that protrudes from the two support surface portions 14a, 14b (i.e., from the reference plane M). The protrusion 15 is disposed between the two support surface portions 14a, 14b. The protrusion 15 is not disposed at the center position in the insertion direction Z of the main body 11, but is disposed closer to the tip end of the main body 11 in the insertion direction Z than the center position. For example, the protrusion 15 is disposed adjacent to the first support surface portion 14a. As a result, the protrusion 15 is configured to prevent the main body 10 from falling off from the tooth member 30 and the adapter 20 to which they are connected and fixed.

[0043] The protrusion 15 is made of a metal material and is formed integrally with the main body 11, protruding from the reference plane M on the side opposite to the engaging portion 12. As will be described later, the protrusion 15 is configured to be able to come into contact with the first inner wall surface portion 23 when the main body 11 is inserted into the insertion hole 35, as shown in FIGS. 8 and 9. When the protrusion 15 comes into contact with the first inner wall surface portion 23, the first support surface portion 14a on the tip side of the main body 11 can be separated from the first inner wall surface portion 23.

[0044] Furthermore, the main body 11 has a recess 16 disposed between the protrusion 15 and the second support surface portion 14b. The recess 16 is formed to be recessed further than the two support surface portions 14a, 14b. In other words, the recess 16 is recessed with respect to the reference plane M. The recess 16 is disposed adjacent to the second support surface portion 14b.

[0045] As will be described later, the recess 16 is configured to accommodate the second inner wall surface portion 36 of the tooth member 30 when the main body 11 is inserted into the insertion hole 35, as shown in Figure 9, before the second inner wall surface portion 36 is supported by the second support surface portion 14b.

[0046] Furthermore, the main body 11 has a flat portion 17 disposed between the recessed portion 16 and the protruding portion 15. The flat portion 17 is formed alongside the first support surface portion 14a and the second support surface portion 14b (i.e., along the reference plane M). Note that the flat portion 17 may not be provided, and the protruding portion 15 and the recessed portion 16 may be adjacent to each other.

[0047] Next, a method for fixing the adapter 20 and the tooth member 30 will be described. First, the retainer 40 is attached to the protruding portion 21 of the adapter 20. The retainer 40 is attached to the front side of the first through-hole 22 of the protruding portion 21, and the engaging portion 43 of the retainer 40 is caused to protrude into the first through-hole 22. Next, as shown in FIGS. 2 to 4, the recessed portion 32 of the tooth member 30 is fitted into the protruding portion 21 of the adapter 20.

[0048] At this time, the first through hole 22 of the adapter 20 and the two second through holes 34 of the tooth member 30 are in communication with each other, and the first through hole 22 and the two second through holes 34 form an insertion hole 35. A stepped surface is formed on the rear inner wall of the insertion hole 35, with the first inner wall surface portion 23 recessed relative to the two second inner wall surface portions 36. Meanwhile, the engagement portion 43 of the retainer 40 faces the first inner wall surface portions 23 and protrudes rearward within the insertion hole 35.

[0049] Next, with the tip portion A of the main body 11 inserted into the insertion hole 35, the lock pin 10 is driven into the insertion hole 35 with a hammer (not shown) or the like. First, as shown in Fig. 7, when the lock pin 10 is first inserted, the tip portion A of the main body 11 comes into contact with the retainer 40 protruding inside the insertion hole 35, and is urged by an elastic reaction force F0 from the elastic portion 41 of the retainer 40 via the rigid portion 42, and is pressed against the first inner wall surface portion 23. However, since the protrusion 15 of the main body 11 protrudes beyond the two support surface portions 14a, 14b, the protrusion 15 comes into contact with the first inner wall surface portion 23 and acts as a fulcrum P, so that the first support surface portion 14a on the tip side of the main body 11 can be gradually separated from the first inner wall surface portion 23. At this time, the flat surface portion 17 of the main body 11 comes into contact with the upper second inner wall surface portion 36 in FIG.

[0050] Furthermore, when the lock pin 10 is inserted into the insertion hole 35, the second inner wall surface portion 36 of the tooth member 30 is accommodated in the recessed portion 16 of the main body 11, as shown in Fig. 8. At this time, the protruding portion 15 acts as a fulcrum P, and the main body 11 receives an elastic reaction force F1 from the retainer 40. In this way, by accommodating the second inner wall surface portion 36 in the recessed portion 16, the first support surface portion 14a on the tip side of the main body 11 becomes even more separated from the first inner wall surface portion 23 in the direction of arrow D, with the protruding portion 15 serving as a fulcrum P.

[0051] Furthermore, at this time, the second inner wall surface portion 36 is accommodated in the recess 16, which reduces the elastic reaction force F1 that the main body 11 receives from the retainer 40, increasing the degree of freedom of the posture of the main body 11, and the posture of the main body 11 (i.e., the posture of the lock pin 10) gradually changes to approach the axial direction of the insertion hole 35 (i.e., the insertion direction Z). This makes it easier to insert the main body 11 deeply into the insertion hole 35.

[0052] 9, when lock pin 10 is further inserted and tip portion A of main body 11 approaches step portion 38, a portion of engaging portion 43 of retainer 40 engages with a portion of engaging portion 12 of main body 11. That is, of the three rigid portions 42 of retainer 40, for example, the upper two fit into and engage engaging portions 12 of main body 11. This intermediate engagement state can further reduce elastic force F2 that main body portion 11 receives from retainer 40, and can also stably maintain the posture of lock pin 10 during insertion. Also in this state, the first support surface portion 14a on the tip side of the main body 11 is largely separated in the direction of the arrow D from the first inner wall surface portion 23 with the protrusion 15 as a fulcrum P.

[0053] 8 and 9, by accommodating the second inner wall surface portion 36 in the recess 16, it is possible to reduce the elastic reaction forces F1, F2 that the main body portion 11 receives from the retainer 40. This reduction in the elastic reaction forces F1, F2 ensures a sufficient degree of freedom in the orientation of the main body 11 for seating the first support surface portion 14a and the second support surface portion 14b against the second inner wall surface portion 36, improving the ease of insertion of the lock pin 10, and also reduces the load applied to the retainer 40, making it possible to suppress separation between the rigid portion 42 and the elastic portion 41.

[0054] Next, as shown in FIG. 10 , the lock pin 10 is further driven into the insertion hole 35, causing the chamfered portion 18 and the first support surface portion 14a of the main body 11 to climb over the stepped portion 38. The first support surface portion 14a and the second support surface portion 14b of the main body 11 then climb over and support the second inner wall surface portion 36 of the tooth member 30. In this manner, when the lock pin 10 is in the mounting position (see FIG. 10 ) where the two support surface portions 14a and 14b individually support the second inner wall surface portion, the side surface of the protrusion 15 abuts against the stepped portion 38. This prevents the lock pin 10 (main body 11) from falling off from the tooth member 30 and the adapter 20, which are connected and fixed to each other. At this time, the engagement portion 12 of the main body 11 is fully engaged with the engagement portion 43 of the retainer 40.

[0055] In this way, the main body 11 receives an elastic reaction force from the front retainer 40 and also receives a pressing force from the two rear second inner wall surface portions 36, so that the tooth member 30 and the adapter 20 are connected and fixed by the lock pin 10.

[0056] 7, when the main body 11 of the lock pin 10 is initially inserted into the insertion hole 35, the tip portion A of the main body 11 comes into contact with the retainer 40 protruding within the first through-hole 22 (i.e., within the insertion hole 35), and is pressed toward the first inner wall surface portion 23 by the elastic reaction force F0 from the retainer 40. However, since the protrusion 15 of the main body 11 protrudes beyond the two support surface portions 14a, 14b (i.e., beyond the reference plane M), the protrusion 15 comes into contact with the first inner wall surface portion 23 and acts as a fulcrum P, and the first support surface portion 14a on the tip side of the main body 11 can be gradually separated from the first inner wall surface portion 23.

[0057] Furthermore, as shown in Figures 8 and 9, the second support surface portion 14b on the rear end side in the insertion direction Z of the main body 11 is configured to accommodate the second inner wall surface portion 36 of the tooth member 30 in the recess 16 of the main body 11 before supporting the second inner wall surface portion 36 (i.e., before the tip portion A of the main body 11 reaches the step portion 38), so that the first support surface portion 14a on the tip side of the main body 11 can be separated even more from the first inner wall surface portion 23 with the protrusion 15 as the fulcrum P.

[0058] In addition, since the second inner wall surface portion 36 is accommodated in the recess, the elastic reaction forces F1, F2 that the main body 11 receives from the retainer 40 are reduced, increasing the degree of freedom of the posture of the main body 11, and the posture of the main body 11 can be brought closer to the direction along the insertion hole 35. Therefore, the main body 11 can be easily inserted deeply into the insertion hole 35.

[0059] As described above, according to this embodiment, the main body 11 can be easily inserted deeply into the insertion hole 35 while the first support surface portion 14a of the main body 11 is largely separated from the first inner wall surface portion 23. Therefore, the first support surface portion 14a of the main body 11 can easily climb over the step portion 38 relative to the first inner wall surface portion 23, and the tip portion A of the main body 11 does not get caught on the step portion 38, making it possible to easily fix the tooth member 30 and the adapter 20 together.

[0060] Furthermore, as shown in Figure 6, the protrusion 15 is positioned closer to the tip than the central position in the insertion direction Z of the main body 11, so that the position of the fulcrum P of the protrusion 15 can be adjusted appropriately, and the tip portion A of the main body 11 can be more suitably separated from the first inner wall surface portion 23.

[0061] Furthermore, since the protrusion 15 is arranged adjacent to the first support surface portion 14a, when the lock pin is inserted, the protrusion 15 abuts against the step portion 38 at the attachment position of the lock pin 10, thereby holding the lock pin 10 in place. In addition, not only when the lock pin 10 is inserted, but also when the tooth member 30 is being used during work by the excavator, the lock pin 10 can be prevented from falling downward beyond the attachment position.

[0062] Furthermore, as shown in FIG. 6, a flat surface portion 17 is provided between the recessed portion 16 and the protruding portion 15 in the main body 11, and the flat surface portion 17 is formed so as to be aligned with the first support surface portion 14a and the second support surface portion 14b. Therefore, even when the recessed portion 16 is formed in the main body 11, it is possible to ensure sufficient rigidity of the main body 11.

[0063] In addition, since the second inner wall surface portion 36 is accommodated in the recess 16, the elastic reaction forces F1 and F2 that the main body portion 11 receives from the retainer 40 can be reduced, thereby ensuring sufficient freedom of position of the main body 11 and reducing the load applied to the retainer 40, thereby making it possible to suppress separation between the rigid portion 42 and the elastic portion 41. [Industrial Applicability]

[0064] INDUSTRIAL APPLICABILITY As described above, the present invention is useful for a lock pin for fixing a tooth member to an adapter at the tip of a bucket of a shovel machine, and for a tooth member fixing structure including the lock pin. [Explanation of symbols]

[0065] 5 buckets 10 Locking pin 11 Main unit 12 Engagement portion 14a 1st support face 14b 2nd support face 15 convex part 16 recess 17 Central plane 20 アダプタ 21 protrusion 22 1st through hole 23 1st inner wall surface 30 ツースComponents 32 concave part 33 Targeted section 34 Second through hole 35 through hole 36 2nd inner wall surface 38 step difference department 40 リテーナ 43 Joint

Claims

1. an adapter provided at a tip of a bucket of the shovel machine, the adapter having a protruding portion with a first through hole formed therethrough, and a retainer attached to the protruding portion so as to protrude into the first through hole; a tooth member having a recessed portion that fits into the protruding portion and in which two second through holes are formed that pass through two opposing portions of the recessed portion, With the protrusion and the recess engaged, the adapter is inserted into an insertion hole formed by communicating the two second through holes with the first through hole, and is configured to connect and fix the adapter and the tooth member by engaging with the retainer, the protrusion has a first inner wall surface portion that faces the first through hole and faces the retainer, the tooth member has two second inner wall surface portions facing the second through hole, and the first inner wall surface portion is disposed between the two second inner wall surface portions; the first inner wall surface portion is disposed recessed relative to the two second inner wall surface portions, so that a portion of the second inner wall surface portion adjacent to the first inner wall surface portion forms a step portion relative to the first inner wall surface portion, a main body having an engaging portion that engages with the retainer; two support surface portions formed on the opposite side of the engaging portion in the main body and individually supporting the second inner wall surface portion when the tooth member and the adapter are connected and fixed, the two support surface portions being composed of a first support surface portion arranged on the leading end side in the insertion direction of the main body and a second support surface portion arranged on the rear end side in the insertion direction of the main body; a protrusion formed on the main body so as to protrude from the two support surface portions, the protrusion being disposed between the two support surface portions and disposed only on the tip side in the insertion direction of the main body relative to a central position in the insertion direction of the main body, the protrusion being configured to be able to come into contact with the first inner wall surface portion when the main body is inserted into the insertion hole; a recess that is disposed between the convex portion and the second support surface portion and adjacent to the second support surface portion, and is formed to be recessed further than the two support surface portions, the recess being configured to be able to accommodate the second inner wall surface portion before the second inner wall surface portion is supported by the second support surface portion when the main body is inserted into the insertion hole.

2. The lock pin according to claim 1 , wherein the protrusion is disposed adjacent to the first support surface portion.

3. The lock pin according to claim 1 , wherein the main body has a flat portion disposed between the recess and the protrusion and formed alongside the first support surface portion and the second support surface portion.

4. an adapter provided at a tip of a bucket of the shovel machine; a tooth member that fits into the adapter; A fixing structure for a tooth member, comprising: the adapter; and the lock pin according to claim 1 for connecting and fixing the tooth member.

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