JP5242569B2 - Bucket tooth mounting structure and mounting pin assembly - Google Patents

Description

  The present invention relates to a tooth mounting structure for a bucket and a mounting pin assembly.

  A bucket used for excavation work in a work vehicle is provided with a plurality of teeth. These teeth are attached to the adapter of the bucket body by a tooth attachment structure as shown in Patent Document 1, for example.

  In this tooth attachment structure, as shown in FIG. 9, the tooth 81 and the adapter 82 are fixed by inserting and fixing the connector pin structure 83 into a hole provided through the tooth 81 and the adapter 82. Is done. The connector pin structure 83 includes a first tubular member 84, a second tubular member 85, and an elastic member 86.

  The first tubular member 84 has a large diameter portion 87 and a small diameter portion 88, and a male screw 89 is provided on the tip side peripheral surface of the small diameter portion 88. The second cylindrical member 85 is provided with a hole 91 formed with an internal thread 90 that is screwed into the external thread 89 of the first cylindrical member 84 on the inner peripheral surface. The elastic member 86 is a tubular member having a through hole 92 penetrating in the axial direction.

In this tooth attachment structure, the connector pin structure 83 is inserted into a hole penetrating the tooth 81 and the adapter 82, and the elastic member 86 is an intermediate formed with a larger diameter than the other part of the hole of the adapter 82. Inserted into portion 93. The small diameter portion 88 of the first tubular member 84 is inserted into the through hole 92 of the elastic member 86 and is screwed into the hole 91 of the second tubular member 85. When the first cylindrical member 84 and the second cylindrical member 85 are screwed together in the holes of the tooth 81 and the adapter 82 and the distance between the first cylindrical member 84 and the second cylindrical member 85 becomes short, the elasticity is increased. The member 86 is sandwiched between the first tubular member 84 and the second tubular member 85 and compressed in the axial direction. When the elastic member 86 is compressed in the axial direction, a force that presses the inner wall surface of the hole of the adapter 82 is generated by the action of the elastic member 86 trying to expand in the radial direction. A frictional force is generated between the wall surface. The connector pin structure 83 is prevented from coming off by this frictional force, and the tooth 81 and the adapter 82 are fixed.
US Pat. No. 6,439,796B1

  In the above tooth attachment structure, both ends of the elastic member 86 are restrained by the frictional force between the first cylindrical member 84 and the second cylindrical member 85, respectively. The portions near both ends of the member 86 are difficult to expand. For this reason, in the intermediate part in the axial direction of the elastic member 86, the force to expand in the radial direction increases, but on the end part side of the elastic member 86, the force to expand in the radial direction decreases. In this case, the friction area between the elastic member 86 and the inner wall surface of the hole of the adapter 82 becomes small, and it is difficult to obtain a large fixing force.

  Moreover, in said patent document 1, in the hole of the adapter 82, the intermediate part 93 facing the elastic member 86 is made larger in diameter than the other parts, so that the elastic member 86 is difficult to be removed from the hole. As a result, the fixing force is increased. However, in general, it is difficult to form such a hole in the adapter, and the manufacture of the adapter becomes complicated.

  An object of the present invention is to provide a tooth mounting structure for a bucket and a mounting pin assembly that can increase the fixing force between the tooth and the adapter with an easily manufactured structure.

  The tooth attachment structure for a bucket according to the first invention includes a tooth, an adapter to which the tooth is attached, a first attachment pin, a second attachment pin, and an elastic member. The first mounting pin is inserted into a hole provided through the tooth and the adapter, and is provided with a male screw. The second mounting pin is provided with a female screw inserted into the hole and screwed into the male screw of the first mounting pin. The elastic member is inserted into the hole, and the male screw of the first mounting pin and the female screw of the second mounting pin are screwed together to be sandwiched between the first mounting pin and the second mounting pin and compressed in the axial direction. Then, it closely contacts the inner wall surface of the hole by expanding in the radial direction. Further, the portion of the hole provided through the tooth and the adapter that faces the elastic member has the same diameter or a small diameter as the other portion of the hole, and at least the outer peripheral surface of the intermediate portion in the axial direction of the elastic member A recess extending along the circumferential direction is provided.

  In the bucket mounting structure, the portion of the hole provided through the tooth and the adapter that is opposed to the elastic member is formed to have the same or smaller diameter as the other portion of the hole. Easy. Further, by providing a recess extending along the circumferential direction on the outer peripheral surface of the axially intermediate portion of the elastic member, it is possible to suppress the radial expansion of the elastic member from being biased to the axially intermediate portion. . For this reason, the friction area between the elastic member and the inner wall surface of the hole increases, and the elastic member can be more firmly fixed. Thereby, in the tooth attachment structure of this bucket, the fixing force between the tooth and the adapter can be increased by an easily manufactured configuration.

  The tooth mounting structure for a bucket according to the second invention is the tooth mounting structure for a bucket according to the first invention, and the outer peripheral surface of the elastic member is provided with irregularities in a bellows shape.

  In this tooth attachment structure of the bucket, since the outer peripheral surface of the elastic member is provided with a bellows-like unevenness, the elastic member can be uniformly expanded in the radial direction in the axial direction.

  The tooth attachment structure for a bucket according to a third aspect is the tooth attachment structure for a bucket according to the first aspect, wherein the first attachment pin includes a shaft portion inserted into a through-hole provided in the elastic member, and a shaft portion A large-diameter portion provided on one end side and having a larger diameter than the shaft portion, and a male screw portion formed on the outer peripheral surface provided on the other end side of the shaft portion and having a smaller diameter than the shaft portion. The second mounting pin has a diameter larger than that of the shaft portion, and the second mounting pin is provided with a hole in which a male screw portion is inserted and a female screw is formed on the inner peripheral surface.

  In this tooth mounting structure of the bucket, since the male screw is provided in the male screw portion having a diameter smaller than that of the shaft portion, when the male screw portion of the first mounting pin is screwed into the hole of the second mounting pin, the second mounting pin Is in contact with the shaft portion of the first mounting pin, whereby the screwing amount of the first mounting pin into the second mounting pin is regulated. Thereby, it can suppress that an excessive compressive force acts on an elastic member, and can suppress damage to an elastic member.

  A bucket tooth attachment structure according to a fourth aspect of the present invention is the bucket tooth attachment structure according to the first aspect of the present invention, wherein washers having the same or larger diameter as the elastic member are disposed at both ends of the elastic member. Is pressed to the first mounting pin and the second mounting pin through a washer.

  In this bucket tooth mounting structure, by providing a washer having the same diameter or a large diameter as the elastic member, it is possible to prevent the washer from entering the elastic member. Thereby, damage to the elastic member can be suppressed.

  A bucket tooth mounting structure according to a fifth aspect of the present invention is the bucket tooth mounting structure according to the first aspect of the present invention, wherein washers are fixed to both ends of the elastic member, and the elastic member is attached to the first mounting via the washer. The pin and the second mounting pin are pressed.

  In this tooth mounting structure of the bucket, the washer is fixed to both ends of the elastic member, so that when the first mounting pin or the second mounting pin rotates, the first mounting pin is screwed into the second mounting pin. This prevents the washer from rotating. Thereby, abrasion of an elastic member can be suppressed.

  A bucket tooth mounting structure according to a sixth aspect of the present invention is the bucket tooth mounting structure according to any one of the first to fifth aspects, wherein a tool is inserted into at least one of the first mounting pin and the second mounting pin. A square hole is provided, and a cover member is further provided. The cover member is made of an elastic material and closes the square hole by being press-fitted into the square hole.

  In the tooth attachment structure of the bucket, the square hole is closed by the cover member, so that the foreign substance can be prevented from clogging the square hole. The cover member is made of an elastic material, and is attached to the square hole by being press-fitted into the square hole. Therefore, the cover member can be easily attached and detached, and the cover member can be made difficult to fall from the square hole due to the elasticity of the cover member.

  A mounting pin assembly according to a seventh aspect of the present invention is a mounting pin assembly for fixing a tooth to an adapter by being inserted into a hole provided through the tooth and the adapter, the first mounting pin, A mounting pin and an elastic member are provided. The first attachment pin is provided with a male screw. The second mounting pin is provided with a female screw that is screwed into the male screw of the first mounting pin. The elastic member is sandwiched between the first mounting pin and the second mounting pin and compressed in the axial direction and expanded in the radial direction when the male screw of the first mounting pin and the female screw of the second mounting pin are screwed together. To do. Moreover, the recessed part extended along the circumferential direction is provided in the outer peripheral surface of the axial direction intermediate part at least of the elastic member.

  In this mounting pin assembly, a recess extending along the circumferential direction is provided on the outer peripheral surface of the axially intermediate portion of the elastic member. Thereby, when it inserts in the hole provided in the tooth | gear and the adapter, it can suppress that the expansion | swelling to the radial direction of an elastic member is biased to the intermediate part of an axial direction. For this reason, the friction area between the elastic member and the inner wall surface of the hole of the adapter increases, and the elastic member can be more firmly fixed. Thereby, in the tooth attachment structure of this bucket, the fixing force between the tooth and the adapter can be increased by an easily manufactured configuration.

  The mounting pin assembly according to an eighth aspect of the present invention is the mounting pin assembly of the seventh aspect, wherein the outer peripheral surface of the elastic member is provided with irregularities in a bellows shape.

  In this mounting pin assembly, since the outer peripheral surface of the elastic member is provided with irregularities in the shape of a bellows, the elastic member can be uniformly expanded in the radial direction in the axial direction.

  A mounting pin assembly according to a ninth aspect is the mounting pin assembly according to the seventh aspect, wherein the first mounting pin includes a shaft portion inserted into a through-hole provided in the elastic member, and one end side of the shaft portion. A large-diameter portion having a diameter larger than that of the shaft portion, and a male screw portion having a diameter smaller than that of the shaft portion. The second mounting pin has a diameter larger than that of the shaft portion, and the second mounting pin is provided with a hole in which a male screw portion is inserted and a female screw is formed on the inner peripheral surface.

  In this mounting pin assembly, since the male screw is provided in the male screw portion having a diameter smaller than that of the shaft portion, when the male screw portion of the first mounting pin is screwed into the hole of the second mounting pin, the second mounting pin is By contacting the shaft portion of the first mounting pin, the screwing amount of the first mounting pin into the second mounting pin is regulated. Thereby, it can suppress that an excessive compressive force acts on an elastic member, and can suppress damage to an elastic member.

  The mounting pin assembly according to the tenth invention is the mounting pin assembly according to the seventh invention, wherein washers having the same diameter or a large diameter as the elastic member are disposed at both ends of the elastic member, The first mounting pin and the second mounting pin are pressed through a washer.

  In this mounting pin assembly, the washer having the same diameter or the large diameter as that of the elastic member is provided, so that the washer is prevented from entering the elastic member. Thereby, damage to the elastic member can be suppressed.

  An attachment pin assembly according to an eleventh aspect of the invention is the attachment pin assembly of the seventh aspect, wherein washers are fixed to both ends of the elastic member, and the elastic member is connected to the first attachment pin via the washer. 2 Pressed against the mounting pin.

  In this mounting pin assembly, the washer is fixed to both ends of the elastic member, so that when the first mounting pin or the second mounting pin rotates, the first mounting pin is screwed into the second mounting pin. The washer is prevented from rotating. Thereby, abrasion of an elastic member can be suppressed.

  A mounting pin assembly according to a twelfth invention is the mounting pin assembly according to the seventh invention, wherein at least one of the first mounting pin and the second mounting pin is provided with a square hole into which a tool is inserted. A member is further provided. The cover member is made of an elastic material and closes the square hole by being press-fitted into the square hole.

  In this mounting pin assembly, since the square hole is closed by the cover member, it is possible to prevent the foreign matter from being clogged in the square hole. The cover member is made of an elastic material, and is attached to the square hole by being press-fitted into the square hole. Therefore, the cover member can be easily attached and detached, and the cover member can be made difficult to fall from the square hole due to the elasticity of the cover member.

  A mounting pin assembly according to a thirteenth invention is the mounting pin assembly according to the seventh invention, wherein annular grooves extending in the circumferential direction are formed on the outer peripheral surfaces of the first mounting pin and the second mounting pin. An annular first seal member made of an elastic material is attached to the groove of the first attachment pin. An annular second seal member made of an elastic material is attached to the groove of the second attachment pin.

  In this mounting pin assembly, the first seal member and the second seal member prevent moisture including earth and sand from entering between the first mounting pin, the second mounting pin, the elastic member, and the adapter. be able to. Thereby, generation | occurrence | production of adhering with a 1st attachment pin, a 2nd attachment pin, an elastic member, and an adapter can be suppressed.

  A mounting pin assembly according to a fourteenth aspect of the present invention is the mounting pin assembly according to any of the seventh to thirteenth aspects, wherein the first mounting pin is a shaft portion that is inserted into a through-hole provided in the elastic member. A large diameter portion provided on one end side of the shaft portion and having a larger diameter than the shaft portion; and a male screw portion having a diameter smaller than that of the shaft portion provided on the other end side of the shaft portion and having an external thread formed on the outer peripheral surface thereof. Have. And the R part is formed in the edge part by the side of the axial part of the external thread part of a 1st attachment pin.

  In this mounting pin assembly, an R portion is formed at the end of the male thread portion of the first mounting pin that is likely to be loaded. Thereby, the stress concentration in this part can be relieved.

The external view of the bucket and tooth attachment structure concerning 1st Embodiment. Sectional drawing which shows a tooth attachment structure. The exploded view which shows the structure of a mounting pin assembly. The figure which shows the attachment process of an attachment pin assembly. The figure which shows the attachment process of an attachment pin assembly. Sectional drawing which shows the bucket and tooth attachment structure which concern on 2nd Embodiment. The figure which shows the cover member which concerns on other embodiment. The figure which shows the cover member which concerns on other embodiment. Sectional drawing which shows the conventional tooth attachment structure.

Explanation of symbols

2 Tooth 3 Adapter 5 First mounting pin 6 Second mounting pin 7 Elastic member 8, 9 Washer 44 First seal member 45 Second seal member 51 Shaft portion 52 Large diameter portion 53 Male screw portion 72 Recessed portion

[First Embodiment]
<Configuration>
1 and 2 show a tooth mounting structure for a bucket according to a first embodiment of the present invention. As shown in FIG. 1, this tooth attachment structure is a structure for detachably attaching the tooth 2 to the main body 1 of the bucket 100, and includes the tooth 2, the adapter 3, and the attachment pin assembly 4.

  The tooth 2 has a tapered wedge-shaped outer shape as shown in FIG. 1, and as shown in FIG. 2, a recess 20 is formed that is recessed from the rear end toward the front end. One side wall 21 (hereinafter referred to as “first side wall 21”) of the recess 20 is provided with a hole 22 penetrating from the outside of the tooth 2 to the inside of the recess 20. A hole 24 that penetrates from the outside of the tooth 2 to the inside of the recess 20 is provided corresponding to the hole of the first side wall 21. These holes 22 and 24 are provided orthogonal to the longitudinal direction of the tooth 2 (the direction connecting the rear end and the front end of the tooth 2, the left-right direction in FIG. 2).

  As shown in FIG. 1, the adapter 3 is provided in the main body 1 of the bucket 100 and is a portion to which the tooth 2 is attached. The adapter 3 has a protrusion 30 that matches the shape of the recess 20 of the tooth 2. The adapter 3 is provided with a hole 31 that penetrates the protrusion 30 and corresponds to the hole 22 of the first side wall 21 and the hole of the second side wall 23, and thus penetrates the tooth 2 and the adapter 3. Thus, holes 22, 24, and 31 are provided. The hole 31 of the adapter 3 has a slightly smaller diameter than the hole 22 of the first side wall 21 and the hole 24 of the second side wall 23. In addition, the hole 31 of the adapter 3 has a straight shape with a constant diameter in the axial direction. Therefore, a portion of the hole 31 facing the elastic member 7 described later and the other portion have the same diameter. Yes.

  The mounting pin assembly 4 is a member for fixing the tooth 2 and the adapter 3 by being inserted into the holes 22 and 24 of the tooth 2 and the hole 31 of the adapter 3, and includes a first mounting pin 5, 2 It has a mounting pin 6 and an elastic member 7.

  The first mounting pin 5 is a member that functions as a bolt that is screwed with the second mounting pin 6, and includes a shaft portion 51, a large diameter portion 52, and a male screw portion 53 as shown in FIG. 3.

  The shaft portion 51 is a portion that is inserted into a through-hole 71 provided in the elastic member 7 described later, and has a cylindrical shape. The axial length of the shaft portion 51 is shorter than that of the non-compressed elastic member 7 (see FIG. 4).

  The large diameter portion 52 is provided on one end side of the shaft portion 51 and has a cylindrical shape having a larger diameter than the shaft portion 51. The axial direction length of the large diameter portion 52 is longer than the thickness of the first side wall 21, and the large diameter portion 52 is inserted in the hole 22 of the tooth 2 and the hole 31 of the adapter 3. The part 52 is disposed across the first side wall 21 and the adapter 3 (see FIG. 2). Further, since the large diameter portion 52 has a larger diameter than the shaft portion 51, a step portion 54 (hereinafter referred to as a “first step portion 54”) is formed at a connection portion between the large diameter portion 52 and the shaft portion 51. Has been. Furthermore, a rectangular hole 56 into which a tool is inserted is formed on the outer end surface 55 of the large diameter portion 52.

  The male screw portion 53 is provided on the other end side of the shaft portion 51 and has a cylindrical shape having a smaller diameter than the shaft portion 51. A male screw 57 is formed on the outer peripheral surface of the male screw portion 53 over substantially the entire axial direction. Since the male screw portion 53 has a smaller diameter than the shaft portion 51, a step portion 58 (hereinafter referred to as “second step portion 58”) is formed at a connection portion between the male screw portion 53 and the shaft portion 51. Yes.

  The second mounting pin 6 is a member that functions as a nut that is screwed to the first mounting pin 5, and is provided with a hole 62 into which the male screw portion 53 of the first mounting pin 5 is inserted. The hole 62 has a smaller diameter than the shaft portion 51, and a female screw 61 is formed on the inner peripheral surface of the hole 62. The second mounting pin 6 has a cylindrical shape having the same diameter as the large-diameter portion 52 of the first mounting pin 5 and has a larger diameter than the shaft portion 51. Further, the axial length of the second mounting pin 6 is longer than the thickness of the second side wall 23, and the second mounting pin 6 is inserted into the hole 24 of the tooth 2 and the hole 31 of the adapter 3. Thus, it is disposed across the second side wall 23 and the adapter 3. Further, a rectangular hole 64 into which a tool is inserted is formed on the outer end face 63 of the second mounting pin 6.

  Note that the axial lengths of the large diameter portion 52 and the shaft portion 51 of the first mounting pin 5 and the axial length of the second mounting pin 6 are the same as the holes 22 and 24 of the tooth 2 of the mounting pin assembly 4 and the adapter 3. The outer end surface 55 of the large diameter portion 52 is flush with the outer surface of the first side wall 21, and the outer end surface 55 of the second mounting pin 6 is flush with the outer surface of the second side wall 23. The shaft portion 51 is set so as to be positioned substantially at the center portion in the axial direction of the hole 31 of the adapter 3.

  The elastic member 7 is made of an elastic material such as natural rubber and has a substantially cylindrical outer shape. The elastic member 7 is provided with a hole 71 penetrating in the axial direction, and the shaft portion 51 of the first mounting pin 5 is inserted into the hole 71. The outer diameter of the elastic member 7 in the non-compressed state is the same as or slightly smaller than the outer diameter of the large-diameter portion 52 of the first mounting pin 5 and the second mounting pin 6, and the inner diameter of the elastic member 7, that is, the diameter of the hole 71 is It is larger than the outer diameter of the shaft portion 51 and smaller than the outer diameter of the large diameter portion 52 and the second mounting pin 6. Further, the axial length of the elastic member 7 in the uncompressed state is longer than the axial length of the shaft portion 51. A plurality of concave portions 72 extending along the circumferential direction are provided on the outer peripheral surface of the elastic member 7 at a distance in the axial direction, and the outer peripheral surface of the elastic member 7 has a bellows-like shape. The elastic member 7 is inserted into the hole 31 of the adapter 3, and the male screw 57 of the first mounting pin 5 and the female screw 61 of the second mounting pin 6 are screwed together, whereby the first mounting pin 5 and the second mounting pin 5 are attached. It is sandwiched between pins 6 and compressed in the axial direction.

  Further, metal washers 8 and 9 having the same diameter as the elastic member 7 are disposed at both ends of the elastic member 7. These washers 8 and 9 are fixed to each end face of the elastic member 7 by fixing means such as adhesion or baking, and are integrated with the elastic member 7. For this reason, the elastic member 7 is pressed against the first mounting pin 5 and the second mounting pin 6 via the washers 8 and 9.

<Mounting of mounting pin assembly 4>
Next, attachment of the attachment pin assembly 4 will be described with reference to FIGS. 4 and 5.

  First, as shown in FIG. 4, the tooth 2 is attached to the adapter 3, and the attachment pin assembly 4 is inserted into the holes 22 and 24 of the tooth 2 and the hole 31 of the adapter 3. At this time, the shaft portion 51 of the first mounting pin 5 is inserted into the hole 71 of the elastic member 7. In addition, the 1st attachment pin 5, the elastic member 7, and the 2nd attachment pin 6 may be separately inserted in the hole 22, 24, 31, and the 1st attachment pin 5, the elastic member 7, and the 2nd attachment pin 6 are temporarily. You may insert in the assembled state.

  Next, a tool is inserted into the square hole 56 of the first attachment pin 5 and the square hole 64 of the second attachment pin 6, and the first attachment pin 5 and the second attachment pin 6 are rotated relative to each other. The male threaded portion 53 of the pin 5 is screwed into the hole 62 of the second mounting pin 6.

  The male threaded portion 53 of the first mounting pin 5 is screwed into the hole 62 of the second mounting pin 6 so that the distance between the first step portion 54 of the first mounting pin 5 and the inner end surface 65 of the second mounting pin 6 is small. As shown in FIG. 5, the elastic member 7 is sandwiched between the first step portion 54 of the first mounting pin 5 and the inner end surface 65 of the second mounting pin 6 and compressed in the axial direction. When the elastic member 7 is compressed in the axial direction, the elastic member 7 expands in the radial direction, thereby closely contacting the inner wall surface of the hole 31 of the adapter 3. When the elastic member 7 is further compressed, the frictional force between the elastic member 7 and the inner wall surface of the hole 31 of the adapter 3 increases due to the force that the elastic member 7 tends to expand in the radial direction. The male threaded portion 53 of the first mounting pin 5 is screwed in until the second stepped portion 58 contacts the inner end surface 65 of the second mounting pin 6, whereby the elastic member 7 is fixed to the adapter 3.

  Note that the axial length of the elastic member 7 in the non-compressed state and the axial length of the shaft portion 51 are screwed in until the second stepped portion 58 contacts the inner end surface 65 of the second mounting pin 6. The frictional force between the elastic member 7 and the inner wall surface of the hole 31 of the adapter 3 is set to have a desired magnitude.

  When the tooth 2 is removed from the adapter 3, the first mounting pin 5 and the second mounting pin 6 are rotated in the reverse direction to weaken the frictional force by the elastic member 7, so that the mounting pin assembly 4 is moved to the tooth. 2 and the hole 31 of the adapter 3.

<Features>
In this tooth attachment structure of the bucket, since the outer peripheral surface of the elastic member 7 is provided with bellows-like irregularities, the elastic member 7 is elastic when compressed by the first attachment pin 5 and the second attachment pin 6. It is possible to prevent the expansion force acting on the member 7 from being biased toward the intermediate portion in the axial direction. Thereby, the fixing force by friction with the elastic member 7 and the inner wall face of the hole 31 of the adapter 3 can be increased.

  Further, in this tooth attachment structure of the bucket, since the fixing force of the elastic member 7 is increased, the hole 31 of the adapter 3 is shaped so that the elastic member 7 is locked as in the conventional tooth attachment structure. It is not necessary and can be a straight shape as described above. Thereby, manufacture of the adapter 3 becomes easy.

  Further, by providing the bellows-like irregularities on the outer peripheral surface of the elastic member 7, a gap is formed between the elastic member 7 and the inner wall surface of the hole 31. When the elastic member 7 is compressed, the expansion of the elastic member 7 can escape into this gap, so that it is possible to prevent an excessive force from acting on the elastic member 7 from the inner wall surface of the hole 31, The lifetime of the elastic member 7 can be extended.

In addition, since the washers 8 and 9 having the same diameter as the elastic member 7 are fixed to both end faces of the elastic member 7, the washers 8 and 9 are recessed into the end face of the elastic member 7 when the elastic member 7 is compressed. It is possible to prevent the end surface of the elastic member 7 from being worn by rotating together with the first mounting pin 5 and the second mounting pin 6. Thereby, wear of the elastic member 7 can be prevented.
[Second Embodiment]
<Configuration>
A tooth mounting structure for a bucket according to a second embodiment of the present invention is shown in FIG. In this tooth mounting structure, annular grooves 41 to 43 extending in the circumferential direction are formed on the outer peripheral surfaces of the first mounting pin 5 and the second mounting pin 6 of the mounting pin assembly 4, respectively. In addition, in FIG. 6, the same code | symbol is attached | subjected to the part corresponding to each part of the tooth attachment structure of the bucket which concerns on 1st Embodiment.

  More specifically, in the first mounting pin 5, a groove 41 (hereinafter referred to as “first groove portion 41”) is provided in the large diameter portion 52. The first groove portion 41 is provided so as to be positioned inside the hole 31 of the adapter 3 in a state where the mounting pin assembly 4 is inserted into the hole 31 of the adapter 3.

  The second mounting pin 6 is provided with a plurality of grooves 42 and 43 (hereinafter referred to as “second groove portion 42” and “third groove portion 43”). The second groove portion 42 and the third groove portion 43 are arranged side by side in the axial direction of the second mounting pin 6. The second groove portion 42 and the third groove portion 43 are provided so as to be positioned inside the hole 31 of the adapter 3 when the mounting pin assembly 4 is inserted into the hole 31 of the adapter 3.

  A first seal member 44 is attached to the first groove 41 of the first attachment pin 5. The first seal member 44 is formed of an elastic material such as rubber, for example, and is a band-shaped member connected in an annular shape. The first seal member 44 is compressed when the first mounting pin 5 is inserted into the hole 31 of the adapter 3, and is in close contact with the inner peripheral surface of the hole 31.

  A second seal member 45 is attached to the second groove portion 42 of the second attachment pin 6. The second seal member 45 is formed of an elastic material such as rubber, for example, and is a band-shaped member connected in an annular shape. The second seal member 45 is compressed when the second mounting pin 6 is inserted into the hole 31 of the adapter 3, and is in close contact with the inner peripheral surface of the hole 31.

  A third seal member 46 is attached to the third groove 43 of the second attachment pin 6. The 3rd seal member 46 is the same shape as the 2nd seal member 45, and omits explanation.

  In the mounting pin assembly 4 according to the present embodiment, the washer 8 has a shape that matches the shape of the shaft portion 51 of the first mounting pin 5. Specifically, the outer peripheral surface of the end portion on the large diameter portion 52 side of the shaft portion 51 of the first mounting pin 5 has a curved shape so that the diameter increases toward the large diameter portion 52 side. Thereby, the stress concentration at the end portion on the large diameter portion 52 side of the shaft portion 51 is alleviated. The washer 8 has a curved shape so as to increase in diameter toward the large diameter portion 52 in accordance with the shape of the shaft portion 51. Further, an R portion is formed at the end of the male screw portion 53 on the shaft portion 51 side. Thereby, the stress concentration in this part is relieved.

  About another structure, it is the same as that of the tooth attachment structure of the bucket concerning 1st Embodiment.

<Features>
In the bucket tooth mounting structure according to this embodiment, the first to third seal members 44 to 46 can prevent moisture including earth and sand from entering between the adapter 3 and the mounting pin assembly 4. it can. Thereby, generation | occurrence | production of adhering with the adapter 3 and the attachment pin assembly 4 can be suppressed.

[Other Embodiments]
(1)
Cover members 10 and 11 as shown in FIGS. 7 and 8 may be attached to the attachment pin assembly 4 according to the above embodiment. The cover members 10 and 11 are attached to the square holes 56 and 64 of the first attachment pin 5 and the second attachment pin 6, respectively, thereby preventing foreign matters such as sand from being clogged in the square holes 56 and 64. it can. The cover members 10 and 11 have a shape corresponding to the shape of the square holes 56 and 64, and are formed slightly larger than the square holes 56 and 64. The cover member 10 is made of an elastic material such as natural rubber, and a circular hole 13 is provided in the outer end surface 12 as shown in FIG. For this reason, it is difficult for the cover member 10 to fall from the square hole 56 due to elasticity. Further, since the hole 13 is provided, the cover member 10 is easily contracted, and the cover member 10 is easily removed from the square hole 56. Further, the inner end surface 14 of the cover member 10 is chamfered and is easily fitted into the square hole 56. In FIG. 8, only the cover member 10 fitted into the square hole 56 of the first attachment pin 5 is shown, but the cover member 11 fitted into the square hole 64 of the second attachment pin 6 is also the same as the cover member 10. Similar structure.

(2)
In the above embodiment, the plurality of recesses 72 are provided in the axial direction of the outer peripheral surface of the elastic member 7. However, even if one or a small number of recesses 72 are provided in the axially intermediate portion of the elastic member 7. Good.

(3)
In said embodiment, although the hole 31 provided in the adapter 3 is straight shape, the part facing the elastic member 7 may be formed in a smaller diameter than another part. Also in this case, the adapter 3 can be manufactured easily.

(4)
In the above embodiment, the screwing amount between the first mounting pin 5 and the second mounting pin 6 is regulated by the second step portion 58 coming into contact with the inner end surface 65 of the second mounting pin 6. By setting the axial length of the screw 57 and the axial length of the hole 62 provided with the female screw 61 to a predetermined length, the screwing amount of the first mounting pin 5 and the second mounting pin 6 can be reduced. It may be regulated.

(5)
In the above embodiment, natural rubber is used as the material constituting the elastic member 7, but other elastic materials such as synthetic rubber and urethane rubber may be used.

(6)
In the above-described embodiment, the elastic member 7 is positioned substantially at the center in the axial direction of the hole 31 of the adapter 3, the outer end surface 55 of the first mounting pin 5 and the outer surface of the first side wall 21 are flush with each other, and The dimensions of each member of the mounting pin assembly 4 are set so that the outer end surface 63 of the second mounting pin 6 and the outer surface of the second side wall 23 are flush with each other. It is not something that can be done. For example, the outer end surface 55 of the first mounting pin 5 may be located on the inner side of the outer surface of the first side wall 21, and the outer end surface 63 of the second mounting pin 6 is on the inner side of the outer surface of the second side wall 23. May be located.

(7)
In the above embodiment, the washers 8 and 9 have the same diameter as the elastic member 7, but may have a larger diameter than the elastic member 7.

(8)
In the above embodiment, the elastic member 7 is arranged slightly shifted from the center in the axial direction toward the first side wall 21 in the hole 31 of the adapter 3 (see FIG. 2), but is arranged at the center in the axial direction. May be.

(9)
In the above embodiment, the outer peripheral surface of the elastic member 7 is provided with irregularities in the shape of a bellows, but the form of the recess is not limited to this, and various modifications can be made. For example, the outer circumferential surface of the elastic member 7 may be provided with irregularities in a spiral shape.

(10)
In the second embodiment, the first mounting pin 5 is provided with one groove and one seal member, and the second mounting pin 6 is provided with two grooves and two seal members. However, the number of grooves and seal members provided in each mounting pin is not limited to this, and various changes can be made.

  INDUSTRIAL APPLICABILITY The present invention has an effect that the fixing force between the tooth and the adapter can be increased by an easily manufactured configuration, and is useful as a tooth mounting structure for a bucket and a mounting pin assembly.

Claims (14)

Tooth,
An adapter to which the tooth is attached;
A first mounting pin inserted into a hole provided through the tooth and the adapter and provided with a male screw;
A second mounting pin provided with a female screw inserted into the hole and screwed into the male screw of the first mounting pin;
The screw is inserted into the hole, and the male screw of the first mounting pin and the female screw of the second mounting pin are screwed together to be sandwiched between the first mounting pin and the second mounting pin and compressed in the axial direction. An elastic member that closely contacts the inner wall surface of the hole by expanding in the radial direction;
With
The part of the hole that faces the elastic member has the same or a smaller diameter as the other part of the hole,
A recess extending along the circumferential direction is provided on the outer peripheral surface of at least the axially intermediate portion of the elastic member.
Tooth mounting structure for bucket. The outer peripheral surface of the elastic member is provided with irregularities in a bellows shape,
The tooth mounting structure for a bucket according to claim 1. The first mounting pin includes a shaft portion that is inserted into a through hole provided in the elastic member, a large-diameter portion that is provided on one end side of the shaft portion and has a larger diameter than the shaft portion, and other shaft portions. A male screw portion having a smaller diameter than the shaft portion, the male screw being formed on the outer peripheral surface provided on the end side;
The second mounting pin has a larger diameter than the shaft portion;
The second mounting pin is provided with a hole in which the male screw portion is inserted and the female screw is formed on an inner peripheral surface.
The tooth mounting structure for a bucket according to claim 1. At both ends of the elastic member, washers having the same diameter or large diameter as the elastic member are disposed,
The elastic member is pressed against the first mounting pin and the second mounting pin through the washer.
The tooth mounting structure for a bucket according to claim 1. Washers are fixed to both ends of the elastic member,
The elastic member is pressed against the first mounting pin and the second mounting pin through the washer.
The tooth mounting structure for a bucket according to claim 1. At least one of the first mounting pin and the second mounting pin is provided with a square hole into which a tool is inserted,
A cover member that is formed of an elastic material and closes the square hole by being press-fitted into the square hole;
The bucket tooth mounting structure according to any one of claims 1 to 5. A mounting pin assembly for fixing the tooth to the adapter by being inserted into a hole provided through the tooth and the adapter,
A first mounting pin provided with a male screw;
A second mounting pin provided with a female screw that is screwed into a male screw of the first mounting pin;
When the male screw of the first mounting pin and the female screw of the second mounting pin are screwed together, they are sandwiched between the first mounting pin and the second mounting pin, compressed in the axial direction, and expanded in the radial direction. An elastic member;
With
A recess extending along the circumferential direction is provided on the outer peripheral surface of at least the axially intermediate portion of the elastic member.
Mounting pin assembly. The outer peripheral surface of the elastic member is provided with irregularities in a bellows shape,
The mounting pin assembly according to claim 7. The first mounting pin includes a shaft portion that is inserted into a through hole provided in the elastic member, a large-diameter portion that is provided on one end side of the shaft portion and has a larger diameter than the shaft portion, and other shaft portions. A male screw portion having a smaller diameter than the shaft portion, the male screw being formed on the outer peripheral surface provided on the end side;
The second mounting pin has a larger diameter than the shaft portion;
The second mounting pin is provided with a hole in which the male screw portion is inserted and the female screw is formed on an inner peripheral surface.
The mounting pin assembly according to claim 7. At both ends of the elastic member, washers having the same diameter or large diameter as the elastic member are disposed,
The elastic member is pressed against the first mounting pin and the second mounting pin through the washer.
The mounting pin assembly according to claim 7. Washers are fixed to both ends of the elastic member,
The elastic member is pressed against the first mounting pin and the second mounting pin through the washer.
The mounting pin assembly according to claim 7. At least one of the first mounting pin and the second mounting pin is provided with a square hole into which a tool is inserted,
A cover member that is formed of an elastic material and closes the square hole by being press-fitted into the square hole;
The mounting pin assembly according to claim 7. An annular groove extending in the circumferential direction is formed on the outer peripheral surface of the first mounting pin and the second mounting pin,
An annular first seal member made of an elastic material is attached to the groove of the first attachment pin,
An annular second seal member made of an elastic material is attached to the groove of the second attachment pin.
The mounting pin assembly according to claim 7. The first mounting pin includes a shaft portion that is inserted into a through hole provided in the elastic member, a large-diameter portion that is provided on one end side of the shaft portion and has a larger diameter than the shaft portion, and other shaft portions. A male screw portion having a smaller diameter than the shaft portion provided on the end side and having the male screw formed on the outer peripheral surface;
An R portion is formed at an end of the male screw portion of the first mounting pin on the shaft side.
The mounting pin assembly according to any one of claims 7 to 13.

Images