JP2676491B2 - Method of forming cushioning material between adjacent bosses in boss mounting part - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a cushioning material between adjacent bosses when mounting a plurality of bosses on a single shaft. Generally, an arm of a civil engineering machine and an attachment attached to the tip of the arm are a boss welded to the attachment portion of the arm tip and a boss welded to the attachment portion of the attachment base end. Is usually pivotally attached to a single shaft. By the way, the attachment of the civil engineering machine of this type is not only subjected to the force around the shaft during the work, but may be laterally shaken due to the force in the axial direction. In such a case, the facing surfaces of the boss on the arm side and the boss on the attachment side abut against each other, resulting in noise pollution. As a solution to this problem, it is conceivable to fit a ready-made O-ring between adjacent bosses when assembling the bosses. However, in the method of fitting a ready-made O-ring, the gap between the bosses and the O-ring size are adjusted. In order to match, O-rings of various sizes must be prepared. In particular, since the attachment is attached to the arm of the construction machine body of a different manufacturer, the gap between the bosses is not constant. Therefore, a ready-made O-ring having a required size may not be obtained, and in order to replace the O-ring, the boss must be removed, so that replacement of the O-ring requires a great deal of labor. Therefore, the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a novel method for forming a cushioning material between bosses mounted on a single shaft. In order to achieve the above object, the present invention, when mounting a plurality of bosses in parallel on a single shaft, at least one of the facing surfaces between adjacent bosses, A ring groove or an arc groove is formed in advance, and a radial groove communicating from the outer peripheral surface of the boss to the ring groove or the arc groove is formed in advance, and the radial groove is formed from the outer peripheral surface side between adjacent bosses via the radial groove. It is characterized in that a high-viscosity material such as silicon rubber is injected into the ring groove or the circular arc groove and solidified to form a cushioning material between the adjacent bosses. Since the ring groove or the arc groove is formed on the facing surface of the adjacent boss and the radial groove communicating from the outer surface of the boss to the ring groove or the arc groove is formed, the silicon is introduced from the radial groove inlet of the outer surface of the boss. When a highly viscous material such as rubber is injected, the highly viscous material flows from the radial groove along the ring groove or the circular arc groove. Since the material to be injected has a high viscosity, it rises along the groove and is hardened to form a cushioning material matching the gap between the bosses, thereby eliminating looseness between the bosses. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a structure of an arm tip portion of a civil engineering machine. In the figure, reference numeral 1 is an arm. As shown in FIG. 1, the attachment mounting member 2 is attached to the tip of the arm 1.
Is detachably attached, and the base end of the attachment 3 for sandwiching the upper claw 3a and the lower claw 3b is pivotally attached to the tip of the attachment attaching member 2 via the connecting shaft 4. That is, the attachment mounting member 2
As shown in FIG. 2, a cylindrical boss 5 is welded to the tip of each of the upper L-shaped arm 6a and the lower L-shaped arm which is detachably and removably fixed to the base ends of the claws 3a and 3b. 6b
Are attached to the respective L-shaped arms 6a and 6b.
As shown in FIG. 2, bosses 7a and 7b having the same diameter as the boss 5 are welded to the base ends of the bosses. Each of these bosses 5, 7a, 7b has a sliding bearing 4a as shown in FIG.
It is pivotally attached to one connecting shaft 4 via. As shown in FIG. 2, a cylindrical positioning member 8 is attached to the end of the connecting shaft 4, and the positioning member 8 is a double bolt screwed on the fixing bolt 9 and the fixing bolt 9. It is fixed to the connecting shaft 4 by the foot 10. On the other hand, at the upper end of the upper L-shaped arm 6a, as shown in FIG. 1, the tip of the upper connecting arm 11a is pivotally mounted via a connecting pin 12a, and the lower L-shaped arm 6b. A tip end of a connecting arm 11b is pivotally attached to a lower end of the connecting arm 11b via a connecting pin 12b. The base ends of the two connecting arms 11a and 11b are pivotally attached to the tip end of the swing arm 14 via a connecting shaft 13.
The base end portion of is attached to the attachment mounting member 2 via a fulcrum shaft 15b. A rod 16a tip of a hydraulic cylinder 16 whose base end is pivotally attached to the arm 1 is pivotally attached to the connecting shaft 13. By expanding and contracting the hydraulic cylinder 16, the both claws 3a,
3b opens and closes with the connecting shaft 4 as a fulcrum. According to the present invention, the cushioning material is formed in the gap between the adjacent bosses assembled as described above. For this reason, the axially opposite end surfaces of the boss 5, that is, the surfaces facing the bosses 7a, 7b are formed. As shown in FIGS. 2 and 3, a ring groove 17 centered on the axis 0 of the connecting shaft 4 and a radial groove 1 that radially connects the ring groove 17 and the outer peripheral surface of the boss 5 are provided.
8 are provided respectively. Next, with the bosses 5, 7a, 7b assembled in the state shown in FIG. 2, the melted silicon rubber or the like is press-fitted from the tip of the radiating groove 18 on the outer surface of the boss 5 to form the radiating groove 1.
The highly viscous material such as the silicone rubber is injected into the ring groove 17 communicating with the ring groove 8 through the ring groove 8. Thus, as shown in FIGS. 2 to 4, a highly viscous material such as silicon rubber is arranged in the ring groove 17 with its tip protruding from the axial end surface of the boss 5 and solidified. As a result, a cushioning material such as silicon rubber is formed along the radial groove 18 and the ring groove 17 between the adjacent bosses 5 and 7a. Next, the operation of this embodiment will be described. When assembling, the ring groove 17 and the radial groove 18 are formed in advance on both axial end surfaces of the boss 5, and the boss 5 is
It is assembled together with the bosses 7a and 7b in the state shown in FIG. Then, a highly viscous material such as silicon rubber in a molten state is pressure-injected from the outer peripheral surface side of the boss 5 into the ring groove 17 through the radial groove 18 to solidify it. As a result, as shown in FIG. 4, the cushioning material 19 whose tip projects from the axial end surface of the boss 5 is formed.
Is formed. If the high-viscosity material is not spread over the entire area of the ring groove 17 by simply injecting the high-viscosity material into the ring groove 17 through the one radiation groove 18, the other radiation groove 18 is formed. The high-viscosity material is also injected from above. As a result, a substantially uniform cushioning material 19 is formed over the entire area of the ring groove 17. Thus, when the civil engineering machine is used with the cushioning material 19 arranged on the surface of the boss 5 facing the bosses 7a, 7b, an axial force acts on each boss 5, 7a, 7b. Even if the horizontal swaying occurs, the axial end surface of the boss 5 and each boss 7
Direct contact with the axial end faces of a and 7b is eliminated, and it is possible to prevent generation of a loud sound due to the contact. The cushioning member 19 is the attachment mounting member 2
Since it is provided on the boss 5, the noise prevention effect is always obtained even if the attachment 3 is replaced. Also, cushioning material 1
Since the boss 9 can be disposed after the bosses 5, 7a, 7b are assembled in the state shown in FIG. 2, the cushioning material 19 can be selectively disposed on the attachment 3 which easily causes noise. Furthermore, the amount of protrusion of the cushioning member 19 from the axial end surface of the boss 5 can be adjusted according to the dimensional tolerance and the like, and thus an optimum cushioning effect can be easily obtained. In the embodiment shown in FIG. 3, the ring groove 1 is formed in the boss 5.
Although the case of forming 7 has been described as an example, as shown in FIG. 5, an annular groove may be formed instead of the ring groove. In the above embodiment, the case where two radiation grooves 18 are provided has been described as an example, but only one or three radiation grooves 18 are provided.
It may be more than a book. Further, in the above-described embodiment, the case where the cushioning material 19 is provided on the boss 5 has been described.
It may be provided in a and 7b. Further, as shown in FIG. 5, the circular arc groove 20 and the radial groove 21 are provided on the boss 5, and the circular arc groove 22 and the radial groove 23 are formed on the bosses 7a and 7b.
May be provided, and the cushioning material may be provided on both of the facing surfaces of the adjacent bosses. The method of the present invention is not limited to civil engineering machines and can be generally applied to any boss assembly structure in which a plurality of bosses are mounted on a single shaft. According to the present invention, since the cushioning material is formed by injecting and solidifying silicone rubber or the like along the groove between the bosses from the outer surface of the boss with the bosses assembled, the gap is matched by a simple procedure. A cushioning material is formed. Since it is possible to form a cushioning material having a size corresponding to the gap between the bosses, it is not necessary to prepare various O-rings as in the conventional case. Since the cushioning material is formed at a predetermined position with the boss assembled, it is not necessary to remove the boss even when a new cushioning material is inserted due to wear of the cushioning material. This advantage is important because the attachment is heavy and requires a lot of labor to attach and detach the boss and is also dangerous.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram of an arm tip portion of a civil engineering machine showing an example of a boss assembly structure according to the present invention. FIG. 2 is an enlarged cross-sectional view of a main portion taken along line II-II of FIG. 3 is an enlarged cross-sectional view taken along the line III-III of FIG. 2; FIG. 4 is an enlarged view of an IV portion of FIG. 5; FIG. 5 is a view corresponding to FIG. 3 showing another embodiment of the present invention; Shaft, 5, 7a, 7b ... Boss, 17 ... Ring groove, 18, 21, 23 ... Radiation groove, 19 ... Buffer material,
20, 22 ... Arc groove.

Claims (1)

(57) [Claims] When mounting a plurality of bosses on a single shaft in parallel, a ring groove or arc groove is formed in advance on at least one of the facing surfaces between adjacent bosses, and the ring groove or arc groove is formed from the outer peripheral surface of the boss. A communicating radial groove is formed in advance, and a highly viscous material such as silicon rubber is injected into the ring groove or the circular arc groove from the outer peripheral surface side between adjacent bosses through the radial groove to solidify. Method of forming cushioning material between adjacent bosses in boss mounting part