JPH08218425A - Pin joined device - Google Patents

Abstract

PURPOSE: To improve working ability in assembly and to easily prevent sediment and rain water from entering a sliding part. CONSTITUTION: A thrust plate 11 is insertedly provided between the end of a boss part 10 having a pressed-in bush 7 and right and left brackets 4, 4. The thrust plate 11 is composed of a ring-shaped plate part 11b provided with a pin inserting hole 11a and an annular protruding part 11c integrally formed with the outer peripheral part of the ring-shaped plate part 11b, and the annular protruding part 11c is fitted in the peripheral wall 10c for a fitting circle of the boss part 10. The boss part 10 is turnably supported by the braket 4, the thrust plate 11 and a pin 6 inserted in the bush 7. Grease 12 is applied between the thrust plare 11 and the boss part 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pin coupling device in which a pin is inserted into a bracket facing each other and a boss portion of a mating member inserted between the brackets, and the boss portion is rotatably supported by the pin. Regarding

[0002]

2. Description of the Related Art FIG. 3 shows an example of a hydraulic excavator. An upper revolving structure 2 is provided on the lower traveling structure 1, and a working machine 3 is attached to the front part of the upper revolving structure 2. The work machine 3 includes a boom 3A that is raised and lowered by a boom cylinder 3D, an arm 3B that is swung by an arm cylinder 3E, and a bucket cylinder 3.
It consists of a bucket 3C that is rotated by F.

Next, attachment of the boom 3A and the upper swing body 2 will be described with reference to FIG. A step portion 4b having an outer diameter substantially equal to the outer diameter of the boss portion 5 is formed on the opposing surfaces of the pair of left and right brackets 4, 4 provided at the front portion of the upper swing body 2. The boss portion 5 of the boom 3A is inserted between the step portions 4b and 4b. The boss portion 5 is provided with a bush fitting hole 5a and a grease-filling annular hole 5b having a diameter larger than that of the bush fitting hole 5a. The bush 7 is fitted into the bush fitting hole 5a by press fitting or the like. Shaft hole 4a of blacket 4 and shaft hole 7 of bush 7
A pin 6 is inserted into a and the boss portion 5 is rotatably supported by the pin 6. A plurality of shims 9 each having a hole through which the pin 6 is inserted are inserted into the gap 8 between the outer end surface of the boss portion 5 and the inner end surface of the step portion 4b of the bracket 4.

[0004]

Conventionally, the shim 9 of a ring-shaped flat plate is inserted between the end faces of the bracket 4 and the boss portion 5, but an operator manually pushes the shim 9 when assembling the pin 6. If it is not supported, it will fall from the assembly gap 8 and workability will be poor. In addition, it is easy for dirt and sand to enter from the outer peripheral portion of the shim 9,
The sliding surface between the bracket 4 and the shim 9 and the sliding surface between the boss portion 5 and the shim 9 are easily worn. Furthermore, it is easy for rainwater to enter,
Since the grease in the gap 8 is washed away by rainwater,
Wear of the sliding surface is promoted.

The present invention has been made in view of the above, and it is not necessary for an operator to support the shim by hand during assembly,
An object of the present invention is to provide a pin coupling device that can easily prevent dirt, rainwater, and the like from entering the sliding surface of a component from the outer peripheral portion.

[0006]

SUMMARY OF THE INVENTION The present invention is to achieve the above object, and a pin is inserted into the opposing bracket and the boss portion of the mating member inserted between both brackets, and the boss is formed by the pin. In a pin coupling device that rotatably supports a ring portion, a ring-shaped plate portion provided with a pin insertion hole between an inner end surface of a bracket and an outer end surface of a boss portion is integrally formed with an outer peripheral edge portion of the ring-shaped plate portion. A thrust plate composed of the above-mentioned annular projection is interposed, and the annular projection of the thrust plate is fitted to the fitting circumferential wall provided at the end of the boss.

[0007]

With the structure in which the annular projection of the thrust plate is fitted to the fitting circumferential wall provided at the end of the boss, there is no need to support it by hand during assembly, and the sliding surface of the component does not have dirt or rainwater. Can be prevented from entering.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
This will be described below. In both figures, the same components as those in FIG. 4 are designated by the same reference numerals. FIG. 1 shows the state of the assembly process, and FIG.
Indicates the assembled state.

Bush holes 10a are provided at both ends of the boss portion 10.
And a grease enclosing hole 10b having a diameter larger than that of the bush hole 10a is provided in the middle portion. The bush 7 is pressed into the bush hole 10a. A thrust plate 11, which replaces the conventional shim, is inserted between the step 4b of the bracket 4 and the fitting circumferential wall 10c formed at the end of the boss 10. The thrust plate 11 is
It is composed of a ring-shaped plate portion 11b provided with a pin insertion hole 11a and an annular protrusion 11c integrally formed with the outer peripheral edge of the ring-shaped plate portion 11b. It is inset. The inner peripheral surface of the annular projecting portion 11c and the outer peripheral surface of the fitting circumferential wall portion 10c are formed concentrically with the pin 6 so that they can rotate with respect to each other, so that the thrust plate 11 and the boss portion 10 can be rotated.
And can slide on each other.

If a lubricant such as grease 12 is applied between the thrust plate 11 and the boss portion 10, the thrust pielate 11 will not come off from the boss portion 10 at the time of assembly due to its adhesive force, and after assembly, Lubricate.

[0011]

According to the present invention described above, the workability is improved because the thrust plate does not fall off during assembly and it is not necessary for a worker to support it by hand. Also,
It becomes difficult for dirt and rainwater to enter the thrust sliding portion, wear can be reduced, grease can be prevented from being washed away, and rust can be suppressed on the sliding portion.

[Brief description of drawings]

FIG. 1 is a sectional view corresponding to FIG. 4 showing an embodiment of the present invention,

FIG. 2 is a sectional view corresponding to FIG. 1, showing a state of an assembling process of one embodiment of the present invention,

FIG. 3 is a side view showing an example of a conventional hydraulic excavator,

FIG. 4 is an enlarged cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

 4 Bracket 7 Bushing 10 Boss portion 10c Fitting circumferential wall portion 11 Thrust plate 11b Ring plate portion 11c Fitting circumferential wall portion 12 Grease

Claims (2)

[Claims] 1. A pin coupling device in which a pin is inserted into an opposing bracket and a boss portion of a mating member inserted between both brackets, and the boss portion is rotatably supported by the pin, an inner end surface of the bracket. Between the outer peripheral surface of the boss and the outer end surface of the boss, a thrust plate composed of a ring-shaped plate portion provided with a pin insertion hole and an annular protruding portion integrally formed with the outer peripheral edge portion of the ring-shaped plate portion is interposed. A pin coupling device characterized in that a protrusion is fitted to a fitting circumferential wall provided at an end of a boss. 2. The pin coupling device according to claim 1, wherein a lubricant is applied between the thrust plate and the boss portion.