Fixing structure for replacement part in construction machinery and locking part used for fixing structure

Abstract

The fixing structure includes a mounting portion, a pin member, and a lock member. The replacement member is attached to the attachment portion. The mounting part comprises a pin hole. The pin member is disposed in the pin hole. The lock member is engaged with the pin member to prevent the pin member from falling off. The lock member includes an opening, a groove portion, a holding portion, and a resistance portion. The groove extends from the opening and engages with the pin member. The retaining portion is provided in the groove portion and retains the pin member from falling off. The resistance portion is provided in the groove portion between the opening and the holding portion. The resistance portion comes into contact with the pin member when engaged with the pin member to provide a hand feeling.

Description

Technical Field

[0001] The invention relates to a fixing structure for replacing components in engineering machinery and a locking component used for the fixing structure. Background Art

[0002] Conventionally, fixing structures for installing replacement parts in construction machinery are known. For example, Patent Document 1 discloses a fixing structure for attaching a bucket tooth to a tooth coupling. This fixing structure includes a pin member and a locking member. Pin holes are provided in the tooth and tooth coupling, respectively, and the pin member is inserted into each of the pin holes. The locking member engages with the pin member to prevent it from falling out.

[0003] The locking component has a U-shaped groove portion that engages with the pin component. A retaining portion for retaining the pin component is provided on the inner surface of the groove portion. The retaining portion includes a pair of protrusions arranged on opposite sides of the groove portion. When the locking component is engaged with the pin component, the pin component passes over the retaining portion and deforms the locking component to squeeze and expand the groove portion, thereby engaging with the groove portion. Thus, the operator can determine that the locking component is engaged with the pin component by feeling the tactile sensation caused by the pin component passing over the retaining portion. In addition, after the locking component is engaged with the pin component, the locking component returns to its original shape. Thus, the locking component is maintained in a state of engagement with the pin component by the retaining portion.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 2021-042633 Summary of the Invention

[0007] Technical problem to be solved by the invention

[0008] In the above-mentioned fixing structure, the retaining portion may sometimes wear out due to the use of the construction machinery. If the retaining portion is worn, when the locking member is reengaged with the pin member after the locking member is removed from the pin member, the same feel as when the locking member was originally engaged cannot be obtained. Therefore, it is difficult for the operator to determine whether the locking member is engaged with the pin member. Therefore, the locking member removed from the pin member cannot be reused, and a new locking member is required each time the member is replaced. The purpose of the present invention is to provide a fixing structure and a locking member for replacing parts in construction machinery, which can reuse the locking member and can easily determine whether the locking member is engaged.

[0009] Means for solving technical problems

[0010] A fixing structure according to one embodiment of the present invention is a fixing structure for detachably fixing a replacement component in an engineering machine. The fixing structure includes a mounting portion, a pin component, and a locking component. The replacement component is mounted on the mounting portion. The mounting portion includes a pin hole. The pin component is arranged in the pin hole. The locking component engages with the pin component to prevent the pin component from falling off. The locking component includes an opening, a groove, a retaining portion, and a resistance portion. The groove extends from the opening and engages with the pin component. The retaining portion is provided in the groove to prevent the pin component from falling off. The resistance portion is provided in the groove between the opening and the retaining portion. When the resistance portion is engaged with the pin component, the resistance portion contacts the pin component to provide a feel.

[0011] Another embodiment of the present invention relates to a locking component that engages with a pin component that detachably secures a replacement component in construction machinery to prevent it from falling out. The locking component includes an opening, a groove, a retaining portion, and a resistance portion. The groove extends from the opening and engages with the pin component. The retaining portion is disposed in the groove to prevent the pin component from falling out. The resistance portion is disposed in the groove between the opening and the retaining portion. When engaged with the pin component, the resistance portion contacts the pin component, providing a tactile feel.

[0012] Effects of the Invention

[0013] According to the present invention, in addition to the retaining portion that prevents the pin from falling out, a resistance portion is also provided to provide a feel to the operator when the locking member is engaged. Thus, even if the retaining portion becomes worn during reuse, the operator can still experience a feel similar to that of a new locking member. This makes it easier to determine whether the locking member is engaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a perspective view of a fixing structure according to the embodiment.

[0015] Figure 2 It is an exploded perspective view of the fixed structure.

[0016] Figure 3 This is a perspective view of the bucket tooth viewed from the base end side.

[0017] Figure 4 It is a diagram showing a locking member.

[0018] Figure 5 It is a fixed structure Figure 1 VV section view in.

[0019] Figure 6A This is a diagram showing the operation of fixing the bucket tooth to the bucket tooth joint device.

[0020] Figure 6B This is a diagram showing the operation of fixing the bucket tooth to the bucket tooth joint device.

[0021] Figure 7This is an enlarged view of the locking components.

[0022] Figure 8 This is an enlarged view of the engaging portion.

[0023] Figure 9 It is a diagram showing a locking member according to a first modification.

[0024] Figure 10 It is a diagram showing a locking member according to a second modification.

[0025] Figure 11 It is a diagram showing a locking member according to a third modified example. DETAILED DESCRIPTION

[0026] Hereinafter, a replacement component fixing structure in a construction machine according to an embodiment will be described with reference to the drawings. Figure 1 It is a perspective view of the fixing structure 1 according to the embodiment. Figure 2 is an exploded perspective view of the fixed structure 1. Figure 1 as well as Figure 2 As shown, the fixing structure 1 includes a tooth coupling device 3, a tooth 4, a pin member 5, and a locking member 6. In this embodiment, the fixing structure 1 is a structure for fixing the tooth 4 to the bucket 2 of the hydraulic excavator. That is, in this embodiment, the tooth 4 corresponds to a replacement part.

[0027] The tooth joint 3 is fixed to the bucket 2. The tooth 4 is mounted on the tooth joint 3. The tooth 4 is mounted on the bucket 2 via the tooth joint 3. The tooth 4 wears due to use of the bucket 2. Severely worn teeth 4 are removed from the bucket 2 and replaced with new teeth 4.

[0028] like Figure 2 As shown, the tooth coupling device 3 includes a fixing portion 11 and a mounting portion 12. The fixing portion 11 is fixed to the bucket 2. For example, the fixing portion 11 is fixed to the bucket 2 by welding. The fixing portion 11 includes a first fixing portion 13 and a second fixing portion 14. The first fixing portion 13 and the second fixing portion 14 are arranged separately from each other. The bucket 2 is arranged between the first fixing portion 13 and the second fixing portion 14.

[0029] The mounting portion 12 has a shape that is narrowed at the top. The first fixing portion 13 and the second fixing portion 14 protrude from the mounting portion 12 toward the base end side. The mounting portion 12 includes a first pin hole 15. The first pin hole 15 penetrates the mounting portion 12 in the left-right direction. The bucket tooth 4 has a shape that is narrowed at the top. The bucket tooth 4 includes a top portion 16 and a base end portion 17. In addition, the so-called top side refers to the direction from the base end portion 17 of the bucket tooth 4 toward the top portion 16. The so-called base end side refers to the direction from the top portion 16 of the bucket tooth 4 toward the base end portion 17. The left-right direction means a direction perpendicular to the direction from the base end portion 17 of the bucket tooth 4 toward the top portion 16, which is equivalent to the left-right direction of the bucket 2.

[0030] Figure 3 This is a perspective view of the bucket tooth 4 from the base end side. Figure 3 As shown, the base end portion 17 of the bucket tooth 4 includes a recessed portion 18. The recessed portion 18 has a shape that is recessed toward the tip side. The mounting portion 12 of the bucket tooth coupling device 3 is arranged in the recessed portion 18. The recessed portion 18 includes a first inner side surface 21 and a second inner side surface 22. A first guide groove 23 is provided on the first inner side surface 21. The first guide groove 23 extends from the base end portion 17 of the bucket tooth 4 toward the tip side. A second guide groove 24 is provided on the second inner side surface 22. The second guide groove 24 extends from the base end portion 17 of the bucket tooth 4 toward the tip side. The bucket tooth 4 includes second pin holes 25 and 26. The second pin holes 25 and 26 penetrate the bucket tooth 4. The second pin hole 25 is provided in the first guide groove 23. The second pin hole 26 is provided in the second guide groove 24.

[0031] The pin member 5 is disposed in the first pin hole 15 and the second pin holes 25 and 26. The pin member 5 engages with the tooth 4 and the tooth coupling 3, thereby securing the tooth 4 and the tooth coupling 3 to each other. The pin member 5 includes an annular pin groove 27. The pin groove 27 is recessed from the outer peripheral surface 28 of the pin member 5.

[0032] The locking member 6 engages with the pin member 5 to prevent the pin member 5, which is disposed in the first pin hole 15 and the second pin holes 25 and 26, from falling out. The locking member 6 engages with the pin groove 27 of the pin member 5. The locking member 6 is formed of a steel material such as manganese steel. The locking member 6 has a curved plate shape. Figure 4 : is a diagram showing the locking member 6. Figure 4 As shown, the locking member 6 includes an engaging portion 31, a pressing portion 32, and a connecting portion 33. The engaging portion 31 engages with the pin member 5. The engaging portion 31 includes a U-shaped groove 34 and an opening 35. The engaging portion 31 engages with the pin member 5 by positioning the pin groove 27 of the pin member 5 within the groove 34. The groove 34 communicates with the opening 35.

[0033] The pressing portion 32 is curved relative to the connecting portion 33. The pressing portion 32 is the portion pressed by the jig when the locking member 6 is engaged with the pin member 5. The connecting portion 33 is disposed between the engaging portion 31 and the pressing portion 32. The connecting portion 33 connects the engaging portion 31 and the pressing portion 32. The locking member 6 has a narrowed shape at the connecting portion 33. The engaging portion 31 and the connecting portion 33 have coplanar plate-like shapes.

[0034] Figure 5 Is fixed structure 1 Figure 1 The VV section view in Figure 1 is shown in Figure 2. Figure 5 As shown, the locking member 6 is inserted into the gap between the mounting portion 12 of the tooth coupling device 3 and the first inner side surface 21 of the tooth 4, and engages with the pin member 5 inside the tooth 4. The pressing portion 32 is located behind the base end portion 17 of the tooth 4 and is exposed to the outside.

[0035] Next, the operation of fixing the bucket tooth 4 to the bucket tooth joint device 3 will be described. Figure 6A As shown, by covering the tooth 4 on the mounting portion 12 of the tooth joint device 3, the mounting portion 12 of the tooth joint device 3 is arranged in the recess 18 of the tooth 4. Then, the pin member 5 is inserted into the first pin hole 15 of the tooth joint device 3 and the second pin holes 25 and 26 of the tooth 4. Figure 6B As shown, the locking member 6 is inserted into the first guide groove 23. Then, the operator presses the pressing portion 32 of the locking member 6 toward the top side using a clamp. As a result, the locking member 6 slides along the first guide groove 23, as shown in FIG. Figure 5 As shown, the engaging portion 31 engages with the pin member 5 .

[0036] In the above description, the locking member 6 is inserted into the first guide groove 23. However, the locking member 6 may also be inserted into the second guide groove 24. In other words, the locking member 6 may be inserted into the gap between the mounting portion 12 of the tooth coupling device 3 and the second inner side surface 22 of the tooth 4.

[0037] Next, the structure of the locking member 6 will be described in detail. In the following description, the direction from the pressing portion 32 toward the engaging portion 31 is referred to as the front direction, and the opposite direction is referred to as the rear direction. In addition, the direction perpendicular to the front-back direction in each drawing is referred to as the left-right direction. Figure 7 It is an enlarged view of the locking component 6. Figure 7 As shown, the groove portion 34 is open toward the front. The groove portion 34 includes a curved portion 41, a first bulged portion 42, a second bulged portion 43, a first inner portion 44, and a second inner portion 45. The curved portion 41, the first bulged portion 42, and the second bulged portion 43 engage with the pin member 5.

[0038] The curved portion 41 has an arcuate shape. The curved portion 41 has an inner diameter larger than the pin groove 27. The first bulged portion 42 and the second bulged portion 43 are arranged to be spaced apart from each other in the left and right directions. The first bulged portion 42 and the second bulged portion 43 bulge inwardly relative to the curved portion 41. The first bulged portion 42 is located between the first inner portion 44 and the curved portion 41. The second bulged portion 43 is located between the second inner portion 45 and the curved portion 41.

[0039] exist Figure 7 In FIG, the two-dot chain line indicates the pin member 5 at the engagement position. The pin member 5 engages with the groove portion 34 at the engagement position. Figure 7 In the figure, the overlapping portion of the pin member 5 and the locking member 6 is shaded in the axial direction of the pin member 5. Figure 7 As shown, the area of ​​the portion where the pin member 5 and the locking member 6 overlap is increased by the first bulged portion 42 and the second bulged portion 43. This strongly suppresses the pin member 5 from falling off in the axial direction.

[0040] like Figure 7 As shown, the first inner portion 44 and the second inner portion 45 are arranged to be separated from each other on the left and right sides. The first inner portion 44 is located on the right side of the groove portion 34, and the second inner portion 45 is located on the left side of the groove portion 34. The first inner portion 44 extends forward from the first bulge 42. The first inner portion 44 faces forward and outward in the left-right direction, and is inclined relative to the front-to-back direction. The second inner portion 45 extends forward from the second bulge 43. The second inner portion 45 faces forward and outward in the left-to-right direction, and is inclined relative to the front-to-back direction. The gap between the first inner portion 44 and the second inner portion 45 increases toward the front.

[0041] The engaging portion 31 includes a retaining portion 46 and a resistance portion 47. The retaining portion 46 and the resistance portion 47 are provided on the inner surface of the groove portion 34. The retaining portion 46 retains the pin member 5 from falling out. The retaining portion 46 includes a pair of first protrusions 48 and 49 arranged on opposite sides of the groove portion 34 in the left-right direction. The pair of first protrusions 48 and 49 protrude toward the inside of the groove portion 34. Specifically, the first protrusion 48 is provided on the first bulged portion 42. The first protrusion 49 is provided on the second bulged portion 43.

[0042] Figure 8 31 is an enlarged view of the engaging portion. Figure 8 As shown, the holding portion 46 contacts the pin member 5 in the pin groove 27 so as to hold the pin member 5 so as not to fall out of the engagement position. Figure 8 In FIG. 1 , the pin member 5 indicated by the two-dot chain line shows the position of the pin groove 27 of the pin member 5 .

[0043] The resistance portion 47 is disposed between the holding portion 46 and the opening 35. The resistance portion 47 contacts the pin member 5 when engaging the pin member 5 to provide a hand feeling. Figure 7 As shown, the resistance portion 47 includes a pair of second protrusions 51 and 52 arranged on opposite sides of the groove portion 34 in the left-right direction. The pair of second protrusions 51 and 52 protrude toward the inside of the groove portion 34. The second protrusion 51 is provided on the first inner portion 44. The second protrusion 52 is provided on the second inner portion 45. The width between the pair of second protrusions 51 and 52 is narrower than the width between the pair of first protrusions 48 and 49. The width between the pair of second protrusions 51 and 52 is narrower than the outer diameter of the pin groove 27.

[0044] exist Figure 8 In the figure, 5' indicated by a single dotted line shows the position of the pin component 5 before engagement. The resistance portion 47 is configured to contact the pin component 5 before the pin component 5 reaches the engagement position when the locking component 6 is engaged, thereby generating resistance. That is, the pin component 5 enters the groove portion 34 from the opening 35. Then, when the pin component 5 passes through the resistance portion 47, it squeezes and expands the resistance portion 47. As a result, the locking component 6 is elastically deformed, and resistance is generated by its reaction force. As a result, the resistance portion 47 provides a hand feel when the locking component 6 is engaged with the pin component 5. In addition, when the pin component 5 is in the engagement position, the resistance portion 47 does not contact the pin component 5.

[0045] According to the fixing structure 1 of the present embodiment described above, in addition to the retaining portion 46 that prevents the pin member 5 from falling off, a resistance portion 47 is also provided to provide a feel when the locking member 6 is engaged. Thus, even if the retaining portion 46 is worn when the locking member 6 is reused, the feel can be substantially the same as that of a new locking member 6. This makes it easy to determine whether the locking member 6 is engaged.

[0046] As mentioned above, although one embodiment of the present invention has been described, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the invention.

[0047] The construction machinery is not limited to hydraulic excavators, but may also be other machines such as bulldozers, wheel loaders, or road graders. The replacement parts are not limited to bucket teeth 4, but may also be other parts such as lip guards, side guards, or ripping blades.

[0048] The structure of the locking member 6 is not limited to the above-mentioned embodiment and may be changed. For example, Figure 9 1 is an enlarged view of the locking member 6 according to the first modification. Figure 9 The retaining portion 46 and the resistance portion 47 are not limited to protrusions, but may also be part of the arc shape 61 provided in the groove portion 34. In other words, the retaining portion 46 and the resistance portion 47 may be arranged to be separated from each other by the arc shape 61 provided in the groove portion 34.

[0049] Figure 10: is an enlarged view of the locking member 6 involved in the second modification. Figure 10 As shown, a straight portion 62 may be provided between the holding portion 46 and the resistance portion 47. That is, the holding portion 46 and the resistance portion 47 may be arranged to be separated from each other by the straight portion 62 provided in the groove portion 34.

[0050] Figure 11 : is an enlarged view of the locking member 6 involved in the third modification. Figure 11 As shown, the first inner portion 44 and the second inner portion 45 are not limited to a straight shape, but may also be a curved shape. That is, the first inner portion 44 may also include a first inclined surface 63 and a second inclined surface 64. The second inclined surface 64 may also extend forward from the first inclined surface 63. The inclination angle of the second inclined surface 64 relative to the front-to-back direction may also be greater than the inclination angle of the first inclined surface 63. Although omitted from the illustration, the second inner portion 45 may also have a shape symmetrical to the first inner portion 44. In addition, in Figures 9 to 11 In the figure, only the right side of the locking member 6 is shown, but the left side of the locking member 6 of each modified example may also have the same Figures 9 to 11 The right side of the diagram shows a partially symmetrical shape.

[0051] Industrial applicability

[0052] According to the present invention, a replacement component fixing structure and a locking component in a construction machine are provided, which enable the locking component to be reused and the engagement of the locking component to be easily determined.

[0053] Description of Reference Numerals

[0054] 1 Fixing structure; 4 Tooth (replacement part); 5 Pin member; 6 Locking member; 12 Mounting portion; 15 First pin hole; 34 Groove; 35 Opening; 41 Bend; 42 First bulge; 44 First inner portion; 45 Second inner portion; 46 Holding portion; 47 Resistance portion; 48, 49 First protrusion; 51, 52 Second protrusion.

Claims

1. A fixing structure for detachably fixing a replacement component in a construction machine, characterized in that: have: a mounting portion, including a pin hole, for mounting the replacement component; a pin component, disposed in the pin hole; as well as A locking component engages with the pin component to prevent the pin component from falling off, The locking component includes: Open your mouth; a groove portion extending from the opening and engaging with the pin member; a holding portion, provided in the groove portion, to hold the pin member from falling off; and The resistance portion is provided in the groove portion between the opening and the holding portion, and contacts the pin member when engaged with the pin member to provide a feel.

2. The fixing structure according to claim 1, wherein: The groove portion further includes: a bent portion engaged with the pin component; an inner portion extending from the opening toward the curved portion; and The bulging portion is disposed between the curved portion and the inner portion and bulges inwardly of the curved portion.

3. The fixing structure according to claim 2, wherein: The holding portion is provided on the bulging portion.

4. The fixing structure according to claim 1, wherein: The holding portion includes a pair of first protrusions arranged on opposite sides of the groove portion, The resistance portion includes a pair of second protrusions arranged on opposite sides of the groove portion.

5. The fixing structure according to claim 4, wherein: The width between the pair of second protrusions is narrower than the width between the pair of first protrusions.

6. The fixing structure according to claim 4, wherein: The pin component includes a pin groove engaged with the locking component, A width between the pair of second protrusions is smaller than an outer diameter of the pin groove.

7. A locking member that engages with a pin member that detachably fixes a replacement part in a construction machine to prevent it from falling off, characterized in that: have: Open your mouth; a groove portion extending from the opening and engaging with the pin member; a holding portion, provided in the groove portion, to hold the pin member from falling off; and The resistance portion is provided in the groove portion between the opening and the holding portion, and contacts the pin member when engaged with the pin member to provide a feel.

8. The locking member according to claim 7, wherein: The groove portion includes: a bent portion engaged with the pin component; an inner portion extending from the opening toward the curved portion; and The bulging portion is disposed between the curved portion and the inner portion and bulges inwardly of the curved portion.

9. The locking member according to claim 8, wherein: The holding portion is provided on the bulging portion.

10. The locking member according to claim 7, wherein: The holding portion includes a pair of first protrusions arranged on opposite sides of the groove portion, The resistance portion includes a pair of second protrusions arranged on opposite sides of the groove portion.

11. The locking member according to claim 10, wherein: The width between the pair of second protrusions is narrower than the width between the pair of first protrusions.

12. The locking member according to claim 10, wherein: The pin component includes a pin groove engaged with the locking component, A width between the pair of second protrusions is smaller than an outer diameter of the pin groove.

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