JPH0550144U - Gap adjustment device for pin joint - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] With the conventional gap adjusting device, when adjusting the facing gap between the boss of the pin coupling part and the bracket, all the plurality of pressing bolts attached to the bracket are temporarily removed. It was removed and the stacking thickness of the spacer was adjusted. Further, since a plurality of pressing bolts are tightened in order so that the flanged bush does not tilt obliquely, considerable time and labor are required. The present invention solves the above problems. [Structure] In the gap adjusting device of the present invention, the bracket 4 '
The pressing rods 24 are respectively inserted into the plurality of through holes 22 penetrating the
To attach the flange 23, and press the pressing rod 2
4 so that the respective tips of the bolts 4 come into contact with the collars of the bushes 8a, 9a fitted to the bracket 4'and through the shaft holes of the flange 23, the bolts 25 with a holding plate are tightened to the screw holes at the pin tips. Configured.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention mainly relates to a clearance adjusting device for a pin coupling portion in a work attachment for a construction machine such as a hydraulic excavator.

[0002]

[Prior Art]

 FIG. 6 is a side view of the main part of the tip of the work attachment 1 for a hydraulic excavator (not shown). In the figure, 2 is an arm, 3 is a bucket, 4 is a bracket that stands upright on the back surface of the bucket 3, 5 is a pin connecting portion that connects the boss 6 at the tip of the arm 2 and the bracket 4, and 7 is a pin connecting portion. 5 is a pin for coupling in 5. FIG. 7 is a cross-sectional view of the main part viewed from AA in FIG. In the drawing, 8a and 8b are flanged bushes fitted to both left and right ends of the boss 6, 9a and 9b are flanged bushes for supporting the pins (7) fitted into the bracket 4, and 10 is a bracket 4 The plurality of pressing bolts 11 provided are pin engaging portions that prevent the pin 7 from coming off and from rotating. FIG. 8 is a detailed view of part B of FIG. 7. In the figure, 12 is a screw hole for screwing a pressing bolt (10) penetrating the bracket 4, 13 and 14 are flange portions of the bushes 8 a and 8 b with flanges, and 15 is a clearance adjustment attached to the neck portion of the pressing bolt 10. A plurality of spacers for adjustment. FIG. 9 is a side view of the main part viewed from CC of FIG.

Next, a conventional gap adjusting device will be described with reference to FIGS. 6 to 9. In the pin connecting portion 5, the rattling noise of the pin connecting portion 5 is adjusted by adjusting the facing gap between the bracket 4 and the boss 6, that is, the facing gap between the flange portions 14 and 13 of the bushes 9a and 8a with collars, respectively. In addition, the O-ring (symbol A shown in FIG. 8) for preventing foreign matter intrusion is prevented from being damaged. When the above clearance becomes larger than the predetermined clearance, the pressing bolts 10 (usually 3 or 4) attached to the bracket 4 are loosened and removed, and the spacer 15 corresponding to the adjusted clearance dimension is removed. Remove only one or more pieces, and attach the pressing bolt 10 again with the remaining spacers. By tightening the plurality of pressing bolts 10, the tip of the pressing bolt 10 pushes the side surface of the collar portion 14, so that the collared bush 9a moves inside. Therefore, it is possible to adjust the facing gap between the brim portions 14 and 13 to a required gap.

[0004]

[Problems to be solved by the device]

 In the prior art pin joint clearance adjustment device, when reducing a large clearance, the spacer thickness corresponding to the clearance adjustment amount must be reduced and the side surface of the flange of the flanged bush must be pressed with the pressing bolt. I have to. For this purpose, all the pressing bolts attached to the bracket must be removed once, and the spacers of the thickness corresponding to the clearance adjustment amount must be removed and reattached. Then, tighten a plurality of pressing bolts alternately and in order, and evenly tighten them so that the flanged bush does not tilt. This operation was cumbersome and took a considerable amount of time and effort. Also, since a large number of spacers are used, spare spacers must be prepared, which is inconvenient for parts management. An object of the present invention is to provide a gap adjusting device that can solve the above problems.

[0005]

[Means for Solving the Problems]

 In the clearance adjusting device for the pin coupling portion of the present invention, a screw hole is bored in the pin axial direction in the tip portion of the pin for coupling the boss and the bracket, and a plurality of through holes are provided in parallel with the pin hole of the bracket. To form a flange by fixing a plurality of pressing rods that can be inserted into the through holes, respectively, and through the axial hole opened in the center of the flange to attach the screw at the tip of the pin. Form a bolt with a holding plate that can be fitted in the hole, insert the above-mentioned pressing rods into the through holes from the outer surface side of the bracket, and attach the flanges. It was made to abut the flange and the bolt with a holding plate was tightened to the screw hole at the pin tip through the shaft center hole of the flange.

[0006]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view of a pin coupling portion 17 having a gap adjusting device 16 of the present invention. In the figure, the same reference numerals are given to those using the same components as those of the conventional technique. 3'is a bucket, 4'is a bracket of the bucket 3 ', 18 is a pin, 19 is a screw hole formed at the tip of the pin 18, 20 is a stopper plate welded to the head of the pin 18, 21 is a pin 18 The engaging portion, 22 is a plurality of through holes penetrating the bracket 4 ′, 23 is a flange, 24 is a pressing rod attached by welding and fixing to a plurality of holes opened in the flange 23, and 25 is It is a bolt with a holding plate. FIG. 2 is a side view of the main part viewed from D in FIG. FIG. 3 is a detailed view of a portion E of FIG. FIG. 4 is a perspective view of the flange 23. In the figure, 26 is an axial center hole of the flange 23. FIG. 5 is a perspective view of the holding plate bolt 25.

Next, the structure of the gap adjusting device 16 of the present invention will be described with reference to FIGS. In the gap adjusting device 16 of the present invention, a screw hole 19 is bored in the pin axial direction at the tip end of the pin 18 for connecting the boss 6 and the bracket 4 '. Further, three through-holes 22 are formed in parallel with the pin holes of the bracket 4 ′, and three pressing rods 24 that can be fitted into the through-holes 22 are fixed to form a flange 23 attached, Further, a bolt 25 with a holding plate that can be fitted into a screw hole 19 at the tip of the pin 18 is formed through a shaft hole 26 (shown in FIG. 4) opened at the center of the flange 23. Then, the three pressing rods 24 are fitted into the through holes 22 from the outer surface side of the bracket 4'and the flanges 23 are attached thereto, and the tips of the pressing rods 24 are fitted in the brackets 4 ', respectively. The flange 14 is brought into contact with the side surface of the flange 14 (shown in FIG. 3), and the bolt 25 with a holding plate is tightened to the screw hole 19 at the tip of the pin 18 through the shaft center hole 26 of the flange 23. The holding plate bolt 25 may be formed by dividing the bolt and the holding plate, and the bolt and the holding plate may be integrally fixed, or may be used in the divided form. Further, as a loosening prevention means for the integrated presser plate bolt 25, the pressurizing plate of the presser plate bolt 25 and the abutting surface of the flange 23 may be tightened by applying a loosening preventive adhesive or the like. .

Next, the operation of the gap adjusting device 16 of the present invention will be described. When the face-to-face gap between the bracket 4'and the boss 6 in the pin coupling portion 17, that is, the face-to-face gap between the flange portions 14 and 13 of the bushes 9a and 8a with flanges becomes larger than a predetermined gap, respectively. First, remove the O-ring for sealing as shown by the arrow B (shown in FIG. 3) and hook it on the outer peripheral portion of the boss 6. Then, using the tightening tool, the tightening operation of the holding plate bolt 25 is performed. Since the three pressing rods 24 of the flange 23 uniformly press the side surface of the flange portion 14, the flanged bush 9a moves inward of the pin axis without tilting. Then, when the facing gap between the flange portions 14 and 13 reaches a predetermined proper gap, the tightening operation is stopped. The clearance adjustment operation is completed by returning the O-ring to the original seal position.

[0009]

[Effect of the device]

 With the conventional clearance adjustment device, when adjusting the facing clearance between the boss of the pin coupling part and the bracket, all the pressing bolts attached to the bracket are temporarily removed to adjust the clearance adjustment amount among the spacers. It had to be reattached, except for spacers of comparable thickness. Also, if the pressing bolts are not tightened in order, the bush with collar may tilt at an angle. The above operation was troublesome and took a considerable amount of time and effort. However, in the gap adjusting device of the present invention, a plurality of pressing rods are fitted into the through holes from the outer surface side of the bracket to attach the flanges, and the tips of the pressing rods are fitted into the brackets. The bolt with holding plate is tightened to the screw hole at the tip of the pin through the shaft center hole of the flange. This eliminates the need for a large number of spacers used in the conventional technique, and the tightening operation of the bolt with the holding plate at only one place may be performed. The flanged bushes do not incline diagonally because the pressing rods on the flange push the side surfaces of the flange evenly. The gap adjusting device of the present invention has a simple structure and can easily adjust the gap of the pin coupling portion in a short time.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a pin coupling portion having a clearance adjusting device of the present invention.

FIG. 2 is a side view of an essential part seen from D in FIG.

FIG. 3 is a detailed view of a portion E in FIG.

FIG. 4 is a perspective view of a flange in the gap adjusting device of the present invention.

FIG. 5 is a perspective view of a bolt with a holding plate in the gap adjusting device of the present invention.

FIG. 6 is a side view of the main parts of the tip of the work attachment for the hydraulic excavator.

FIG. 7 is a cross-sectional view of a main part seen from AA in FIG.

FIG. 8 is a detailed view of a B part in FIG.

FIG. 9 is a side view of the main part viewed from CC of FIG.

[Explanation of symbols]

 1 Work Attachment 2 Arms 3,3 'Bucket 4,4' Bracket 5,17 Pin Joint 6 Boss 7,18 Pins 8a, 8b, 9a, 9b Collar Bushing 13,14 Collar 16 Gap Adjuster 22 Through Hole 23 Flange 24 Pressing rod 25 Holding plate bolt 26 Shaft center hole

Claims (1)

[Scope of utility model registration request] 1. A boss and a bracket are rotatably connected to each other through a pin, a plurality of holes are formed in the bracket in parallel with the pin holes of the bracket, and the bracket is fitted into the bracket through the holes. A clearance adjusting device that adjusts the clearance between the flange and the boss by pressing the flange part of the bush with a flange.The device adjusts the axial direction of the pin at the tip of the pin that connects the boss and the bracket. A hole is bored, a plurality of through holes are formed in parallel with the pin holes of the bracket, and a plurality of pressing rods that can be inserted into the through holes are fixed to form a flange. Form a bolt with a holding plate that can be fitted into the screw hole at the tip of the pin through an axial hole opened in the center of the flange, and insert the pressing rods into the through holes from the outer surface side of the bracket respectively Each of the above-mentioned pressing rods is attached so that the tip of each of the above-mentioned pressing rods abuts on the flange of the bush with the flange fitted into the bracket, and the bolt with the pressing plate is tightened to the screw hole of the pin tip through the shaft hole of the flange. A gap adjusting device for a pin coupling portion characterized by: