JPH0532647Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is a pin coupling device that is applied to the bucket pin coupling part of a hydraulic power shovel. This invention relates to a pin coupling device that makes it possible to easily eliminate gaps.

[Prior Art] As shown in Figs. 5 and 6, a pin coupling device used in a conventional hydraulic power shovel rotatably connects a bracket b of a bucket a and a boss d of an arm c with a connecting pin e. and said bracket b
A movable bush f is fixed to the boss d side with a bolt g, and a spacer h is installed between the bolt g and the bracket b in advance. When a gap occurs, remove the spacer h of an amount corresponding to the gap and tighten the bush. f was moved to the boss d side to eliminate the gap.

Furthermore, the pin coupling device disclosed in Japanese Utility Model Application Publication No. 58-52315 discloses a technique for adjusting the gap caused by wear between the bracket 3 and the boss 7 when the device is used. . However, as is clear from FIG. 3, this technique has the disadvantage that the adjusting member 22 can move in the axial direction of the pin during the use of the device. It is stated that the adjustment member 42 shown in FIG. 5 of the pin coupling device described in Publication No. 52315 is held between the end surface of the boss 7 and the shoulder of the large diameter portion 41B of the pin 41. . But that pin 4
One end of the pin 1 has a male thread, and by tightening the tightening nut 47 that is screwed into the male thread 41C, the gap between the end face of the adjusting member 42 and the boss 7 can be adjusted. There are problems with practicality due to the nature of the pin, which requires a complicated shape and uses a tough material that is not suitable for machining.
In addition, the large diameter part 41B of the pin 41 will be inserted into the large diameter hole 43 of the bracket 3, which is integrated with the part of the bucket 2 that is subject to severe usage conditions. The large diameter hole 43 also needs to be made strong, which has the drawback of increasing costs more than necessary.

In addition, in Japanese Utility Model Application Publication No. 58-52315, the outer diameter of the movable bushing is exposed due to the spacer removal method, and when adjusting the gap, a gap is created between the movable bushing and the movable bushing fixed part, and the outer diameter of the movable bushing is be exposed. Therefore, the outer diameter of the portion is exposed to dirt, dust, etc., and is subject to wear and corrosion.

In addition, when replacing the arm with a new one (the width of the end face of the arm boss is the dimension before wear), a spacer is added to restore the positional relationship before adjustment, but since the outer shape of the movable bushing part is damaged, there is some wobbling in the radial direction. becomes large.

Further, if the removed spacer is lost, it is necessary to purchase a new one, and there are drawbacks such as troublesome parts management after adjusting the gap.

Furthermore, since the movable bushing is separate from the bucket side bracket, it is necessary to provide an appropriate radial gap between the movable bushing and the bucket side bracket in order to allow the movable bush to slide. Since the bush and bucket side bracket are not connected with bolts, there is nothing to restrict relative rotation, and if used for a long time, the sliding of the relevant parts will cause wear and increase radial play. There are drawbacks.

Further, the adjusting member 42 in Japanese Utility Model Publication No. 58-52315 has the function of a movable pushbutton between the pin and the adjusting member 4.
Although it is divided into two parts, it is questionable from a practical point of view, and in order to adjust the play in this structure, it is necessary to tighten the nut 47 at the end of the pin with a certain amount of torque. This is because when this nut loosens, the fixing pin 41 will come out and the bucket will come off from the arm.

Therefore, the boss end face of the arm 1 and the end face of the adjustment member 42 are brought into close contact with each other with an axial force commensurate with the tightening torque of the nut 47, but the relative rotation between the arm and the bucket promotes wear on the contact surfaces. Otherwise, they will rotate together, which is not practical. Furthermore, with this structure, the pin portion is exposed, which is undesirable in terms of the durability of the pin.

In addition, the gap adjustment device for the bucket arm hinge described in Utility Model Application Publication No. 60-70661 is as follows:
Looking at Figure 3, we can see that the arm tip boss 3 is
When a rattling due to the gap t occurs between the end surface 3a of the inner spacer 7 and the inner surface of the inner spacer 7, the bolt 11 is loosened and the outer spacer 5 is inserted into the inner spacer 5. It is described that the bolt 11 is tightened to absorb the looseness.
Also, looking at Figure 5, if looseness occurs between the arm end boss 3 and the spacer 7, the bolt 1
Loosen bolt 1, add another shim 5 to shim 5, and tighten bolt 1.
1 and absorbs looseness.

Both of the spacers 7 shown in FIG. 3 and FIG.
The feature is that the hinge pin 2 is directly supported only by the bucket side boss 1, that is, the bracket part, since it is not in contact with the bucket and has no bearing function. Therefore, by welding the relatively thin bucket side boss 1, that is, the bracket part, to a thicker wall, the hinge pin 2
The contact surface of the bearing part has been enlarged. Therefore,
Since the bucket side boss 1, that is, the bracket part, is directly used as the bearing part of the hinge pin 2, the contact surface will wear out due to wear over time during use, and play will occur in the bearing part of the hinge pin 2, that is, the bucket side boss 1, that is, the bracket part. However, as a countermeasure, the bucket side boss 1, that is, the bracket part, must be strengthened to overcome the strength of the hinge pin 2, which is relatively strong and has a hard surface. Although it is not impossible to replace the hinge pin 2 by doing so, it would be necessary to perform troublesome treatments such as heat treatment to strengthen the bucket side boss 1, that is, the bracket part, and there would be no undesirable distortion. I have to do it that way. In any case, if the hinge pin 2 is directly supported by the bracket as a bearing, various drawbacks arise. To summarize this, it is as follows.

The spacer 7 shown in FIGS. 3 and 5 in Japanese Utility Model Application No. 60-70661 is simply for adjusting the gap, and in this structure, the spacer 7 receives the load of the pin 2. Never. Therefore, the load entering pin 2 is transferred to boss 1 on the bucket side.
will be in charge. However, since the spacer 7 does not bear any load, the width dimension is determined so as to ensure the necessary surface pressure strength only with the bucket side boss 1.
Since the thickness of the spacer 7 is added to the above-mentioned width dimension, the compactness as a whole is lacking.
Further, the strength of the pin 2 is determined by the distance between the arm end boss 3 and the bucket side boss 1 in the longitudinal direction of the pin. If there is no spacer 7 and there is no gap in the pin longitudinal direction between the arm end boss 3 and the bucket side boss 1, it is pure shearing, but in this structure, the spacer 7 intervenes and a large gap is created in the pin longitudinal direction. In unavoidable structures, in addition to shearing, bending moments are applied depending on the gaps. Therefore, there is a drawback that the pin diameter must be increased in advance in order to withstand the increased bending moment.

[Problems to be solved by the invention] Therefore, the present invention solves the above-mentioned problems of the conventional gap adjustment mechanism, and has a structure that can withstand long-term use and that can be used with a large gap. It is also an object of the present invention to provide a pin coupling device that does not cause any problems.

[Means for solving the problem] The present invention rotatably connects the bracket and the boss with a connecting pin, and disposes a bushing movably in the axial direction of the connecting pin. That is, the inner end face is made to face the end face of the boss, the other end face, that is, the outer end face, projects slightly outward from the outer peripheral face of the bracket, and one end face of the connecting pin and one end face, that is, the outer surface of the bush They are aligned in the axial direction, the outer peripheral part of the end face of the boss and the outer peripheral part of the inner end face of the bush opposite to the end face of the boss have the same diameter, and a flange part is provided in the middle part of the bush. The outside diameter of the part inside the flange part is made larger than the outside diameter of the part outside the flange part of the bushing, and when a gap occurs between the end face of the boss and the end face of the bushing, the bushing is This is a pin coupling device in which an adjusting member can be interposed between the flange portion of the bush and the bracket by means of a bush fixing bolt so as to be moved to the boss side and eliminate a gap.

[Function] In the present invention, a bracket and a boss are rotatably connected by a connecting pin, a bushing is disposed so as to be movable in the axial direction of the connecting pin, and one end surface, that is, the inner end surface of the bushing is connected to the boss. one end surface of the connecting pin and the one end surface of the bushing are aligned in their axial directions; A flange portion is provided in the middle portion of the bushing, and the outside diameter of the part inside the flange part of the bushing is made larger than the outside diameter of the part of the bushing outside the flange part, and the end face of the boss and the end face of the bushing are When a gap is generated between the bushing and the boss, an adjusting member can be interposed between the flange portion of the bushing and the bracket using a bushing fixing bolt so as to move the bushing toward the boss side and eliminate the gap. Since this is a pin coupling device, when a gap occurs between the end face of the boss and the end face of the bushing, the bushing is moved to the boss side to adjust the gap, and the gap created between the bushing and the bracket is fixed. An adjusting member, ie, a spacer, for adjusting the amount of the gap may be interposed in the gap, and the bush, the bracket, and the adjusting member, ie, the spacer may be fixed with a bush fixing bolt to form an integral structure. Therefore, in practice, insert a spacer instead of a gauge into the gap between the boss and the bushing, check the required thickness, loosen the bushing fixing bolt, insert the spacer between the bracket and the bushing, and then tighten the bushing fixing bolt to secure the bushing. can be fixed and eliminate gaps.

[Example] An example of the present invention will be described below with reference to the drawings.
Explain in detail.

First Embodiment In FIG. 1, 1 is an arm side boss, 2 is a bucket side bracket, 3 is a connecting pin that connects the boss and the bracket, 4 is a bush that can be moved to the boss side, 5 is a bush fixing bolt, 6 7 is a washer, 7 is a spacer, 8 is a connecting pin retaining bolt, 9 is a retaining bolt nut, and 10 is a bearing. If a gap amm occurs between the arm side boss 1 and the bucket side bracket 2, use a spacer 7 made of several different thicknesses prepared in advance.
Select a spacer 7 with a thickness corresponding to the gap amm, or insert the spacer 7 into the gap like a feeler gauge, select the spacer to be used, and then insert the bucket side bracket 2 and the bush 4 inserted into the bucket side bracket 2. If you remove the fixing bolt 5 and push the bush 4 toward the arm-side boss 1 until there is no gap amm, a gap of amm will be created between the bucket-side bracket 2 and the bush 4. Insert the spacer 7, which is an adjustment member that adjusts the amount of clearance to match this gap, between the bucket side bracket 2 and the bush 4, and tighten the bush fixing bolt 5, then the arm side boss 1 and the bucket side bracket 2 will be fixed.
There will be no gaps in between.

Second example A second embodiment will be described with reference to FIG.

The reference numerals shown in this figure are the same as those in FIG. 1, and explanations of the constituent members will be omitted. The second embodiment is based on the first
In the example, instead of the spacer 7 prepared in advance, the spacer 7 is attached to the bucket side bracket 2 using the bush fixing bolt 5, and when adjusting the gap a, only the necessary thickness is removed, and the spacer 7 is attached to the bucket side bracket 2. It is used by inserting it between the and bushings 4. Although there is a drawback that the spacer rusts and is difficult to remove when used for a long period of time, there is no need to manage the spacer 7, and the threading distance of the fixing bolt 5 is always the same regardless of whether the gap is adjusted or not.
Sufficient tightening force will be obtained.

In addition, in the first and second embodiments, in order to insert the spacer 7 without removing the connecting pin 3, a half-split spacer was used as shown in FIG. It is also possible to form it into a ring shape. However, in this case, it is necessary to remove the connecting pin 3, remove the arm side boss 1, and also remove the bush 4 before inserting the spacer 7, but the spacer fits well for an integral spacer.

[Effects of the invention] The present invention rotatably connects the bracket and the boss with a connecting pin, and disposes a bushing so as to be movable in the axial direction of the connecting pin. The other end surface, that is, the outer end surface, projects slightly outward from the outer peripheral surface of the bracket, and the one end surface of the connecting pin and the one end surface, that is, the outer end surface of the bushing are aligned in their axial direction. Align the outer periphery of the end face of the boss and the outer periphery of the inner end face of the bush opposite to the end face of the boss to have the same diameter, provide a flange part in the middle part of the bush, and The outer diameter of the portion is made larger than the outer diameter of the portion outside the flange portion of the bushing, and when a gap occurs between the end face of the boss and the end face of the bushing, the bushing is moved toward the boss side. Since this is a pin coupling device in which an adjustment member can be interposed between the flange portion of the bush and the bracket using a bush fixing bolt so as to eliminate a gap, there is no gap between the end face of the boss and the end face of the bush. When a gap is generated, the bush is moved to the boss side to adjust the gap, and an adjustment member, that is, a spacer is interposed in the gap created between the bush and the bracket to adjust the amount of the gap, and the bush is adjusted. The fixing bolt has the effect of fixing the bush, the bracket, and the adjusting member, ie, the spacer, to form an integral structure. Further, according to the present invention, a spacer having a thickness corresponding to the gap created between the arm-side boss and the bushing is inserted between the bracket and the bushing on the bucket side, and the bushing is moved against the bracket by the width of the spacer. Move it in the direction of the arm side boss,
By adjusting the gap between the arm side boss and the bush to virtually eliminate it to the extent that rotational operation is not disabled, the bucket side bracket and the bush are always in close contact with each other without mutual movement via the spacer. In addition, as mentioned above, since there is virtually no gap between the arm side boss and the bushing where foreign matter could enter, it virtually eliminates the intrusion of foreign matter such as muddy water. The progress of wear caused by the presence of foreign matter can be significantly slowed down, making it durable for long-term use. At the same time, the part of the peripheral surface of the connecting pin located deeper than the gap between the arm-side boss and the bushing has the effect of reliably eliminating intrusion of foreign substances such as muddy water. Needless to say, the contact area between the inner circumferential surface of the hole in the bush and the outer circumferential surface of the connecting pin does not move relative to each other due to the action of the connecting pin retaining bolt, so there is a risk of wear. Best of all, by interposing a bearing between the boss and the connecting pin, mutual movement can be performed without any hindrance, and furthermore, by virtually eliminating the intrusion of foreign substances such as muddy water into that part, radial play can be reduced. There is no risk of such occurrence, and the effect can withstand long-term use. In addition, in the present invention, the bush is movable in the axial direction of the connecting pin to allow the bracket and the boss to freely rotate. Although the end faces of the boss and the boss are located very close to each other, and the rotation between the bracket and the boss is good, over time the end faces of the boss and the end face of the bush may come into contact with each other. Things like wear and tear happen. Therefore, as a result of the above-mentioned wear, a gap is created between the end face of the boss and the end face of the bushing, and in order to adjust the gap, the bushing is moved to the boss side to close the gap. and an adjusting member for adjusting the amount of the gap is interposed in the gap created between the bushing and the bracket, and the adjusting member is interposed between the bracket and the bushing as described above. By tightening the bush fixing bolt to form the bracket and the bush into an integral structure, there is an effect that the bracket can be used in the same state as when it was first used. The strength of the connecting pin 3 is determined by the gap a in the longitudinal direction of the connecting pin 3 shown in FIGS. 1 and 2.
influences. That is, the strength of the connecting pin 3 is determined by pure shear when the gap a is 0 (zero), but
When the gap a exists, in addition to shearing, a bending moment corresponding to the gap a acts, so that as the gap a becomes larger, the strength of the connecting pin 3 is reduced. Gap a shown in Figures 1 and 2
Insert the spacer 7 as shown in the example text,
It can be adjusted to 0 (zero) by sliding the movable bush, and has no effect on the pin strength, and the movable bush bears the load from the connecting pin 3 and has the effect of functioning effectively as a functional component. In particular, the present invention increases the length in the longitudinal direction of the bush that supports one end of the connecting pin 3 so that it extends from the end surface of the boss to the outside, albeit slightly, of the outer surface of the bracket. Even if a large force or impact force is applied to the relatively wide part near the part, it will not be damaged unnecessarily, so it is effective in ensuring sufficient safety. Further, in the present invention, one end surface of the bush is made to face the end surface of the boss, the other end surface is made to protrude slightly outward from the outer surface of the bracket, and one end surface of the bush and one end surface of the connecting pin are arranged so as to be opposite to the end surface of the boss. Since the boss is aligned in the axial direction, during long-term use, a gap will occur between the end face of the boss and the end face of the bush facing the end face.
To adjust the gap, remove the bush fixing bolt, move the bush to the boss side, use the end face of the connecting pin as a reference, and check from the outside how far the end face of the bush has moved inward. By interposing an adjustment member of an appropriate width between the bush and the bracket, the bush and the bracket can be reliably and integrally connected by the bush fixing bolt. In addition, the present invention provides a flange part at the middle part of the bushing, the outer diameter of the inner part of the flange part is larger than the outer diameter of the outer part of the flange part, and the size of the large diameter part and the end face of the bushing are Since the size of the end face of the boss facing the connecting pin is the same as that of the boss, both the bush and the boss can have corresponding end faces in just the right amount, and the boss movable in the axial direction of the connecting pin can be Even if an external force moves and comes into contact with the end surface of the bush, it has the effect of uniformly contacting the entire end surface of the bush. In addition, in the present invention, a part with a smaller diameter than the inner side is formed outside the flange part of the intermediate part of the bushing, and a stepped structure is formed on the outer surface of the flange part, so that the end face of the boss moves to the side where the bushing is. When the end surface of the bush receives a pressing force from the boss, the entire outer surface of the flange part will apply force to the inner surface of the bracket either directly or through the adjustment member, so the small diameter part of the bush should be as small as possible. This has the effect of allowing the force to be received over a wide area on the inside surface of the bracket and dispersing the force received over a wide area on the inside surface of the bracket.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the first embodiment of this invention;
Fig. 2 is a sectional view showing a second embodiment of this invention, Figs. 3 and 4 are front views showing various examples of spacers, and Fig. 5 is a sectional view showing a second embodiment of the invention.
The figure is a side view of the power shovel, and FIG. 6 is a sectional view in FIG. 1...Boss, 2...Bracket, 3...Connecting pin, 4...Button, 7...Spacer.

Claims (1)

[Scope of utility model registration request] The bracket and the boss are rotatably connected by a connecting pin, and a bushing is disposed so as to be movable in the axial direction of the connecting pin, so that one end surface, that is, an inner end surface of the bushing can face the end surface of the boss. , the other end surface, that is, the outer end surface, projects slightly outward from the outer peripheral surface of the bracket, one end surface of the connecting pin and one end surface, that is, the outer end surface of the bushing are aligned in their axial directions, and the outer peripheral portion of the end surface of the boss is aligned. and the outer circumferential portion of the inner end surface of the bushing facing the end surface of the boss are the same diameter, a flange portion is provided at the middle portion of the bushing, and the outer diameter of the portion inside the flange portion of the bushing is the same as the outer diameter of the flange portion of the bushing. The bushing fixing bolt is made to have a larger diameter than the outer diameter of the outer part, and when a gap occurs between the end face of the boss and the end face of the bushing, the bushing is moved to the boss side to eliminate the gap. A pin coupling device in which an adjusting member can be interposed between the flange portion of the bush and the bracket.