JPH059531Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a distance adjustment device for pin joints in general construction machinery and industrial machinery, and is particularly applicable to buckets at the end of the arm of a hydraulic power shovel. This invention relates to a device for adjusting the distance between pin joints of pins for pivotally supporting an attachment.

(Prior Art) Conventionally, in relatively large machines such as construction machines and industrial machines, the constituent members of the machine are supported by pins, and the constituent members are pivoted around the pins. A pin coupling device that allows the machine to rotate freely has been incorporated into an important part of the machine and used to perform various tasks. Among construction machinery, especially
Hydraulic power excavators, etc., have attachments such as the bucket at the end of the arm that collect dirt, sand, etc.
When scooping out mud, crushed stone, etc., the area is exposed to extremely harsh conditions. Furthermore, during excavation, it is subjected to a strong impact force, so it must be able to withstand it. In addition, large loads are applied during lifting and loading operations, and strong forces are required to withstand such loads. and again,
Not only does it require strong force, but also muddy water,
There was constant interference from dust and other substances that interfered with the operation of the machinery. Therefore, those involved were busy dealing with this issue, but they were not always able to respond appropriately, and as a result, they were forced to search for better and more specific solutions. Therefore, various proposals have been made. In order to create a structure that can withstand strong impact forces and large loads, it is necessary to improve materials as a matter of design technology and develop lightweight, high-performance machines that can meet these requirements. There has been a need for a pin coupling device that does this. Therefore, an example of the conventional technology will be explained with reference to FIG. 2 of the specification of the pin joint part adjustment device of the present invention. FIG. 2 shows the front structure of a hydraulic power shovel, and the swing boom a
A first hydraulic cylinder c is interposed via a pin between the boom b and the boom b pivotally supported by the boom b, and a second hydraulic cylinder c is interposed via a pin between the boom b and the arm d pivotally supported by the boom b. A third hydraulic cylinder f is interposed between the arm d and the other end of the strap i, one end of which is pivotally supported near the tip of the arm d. A bucket rod h is interposed via a pin between the bucket rod g and the bucket rod g, which is pivotally supported at the tip of the bucket rod.In this way, each member is assembled by pin connections at 11 places, and three hydraulic cylinders c, e, The posture of the front section changes by expanding and contracting f, allowing civil engineering work such as excavation and loading to be performed. Conventionally, the pin joint of this type of machine has a pin bush 3 attached to a pin 2 held at both ends by a pair of brackets 1, as shown in FIG.
As shown in FIG. 4, the pin bushing 3 is fitted into the pin 2 whose both ends are held between the pin bosses 4 fitted into the pair of brackets 1, and the pin boss 4 of the pin 2 A plate 5 is disposed on the protruding end, and a nut 6 is screwed onto the end of the pin 2. In such cases, the surface hardness of the pin 2 is generally hardened to an extreme degree by surface hardening treatment techniques such as carburizing and quenching, so a male screw is carved into the edge of the pin 2. Creating a threaded part by doing so is something that must be avoided in terms of pin processing technology, and if such a thing is done, there is a risk of damaging the threaded part due to shear stress.
This is extremely important from a safety standpoint. However, the fact is that some people have done such dangerous things. Furthermore, by filling the space between the pin 2 and the pin bushing 3 with lubricating oil such as grease in an oil-tight state, wear between the pin 2 and the pin bushing 3 is prevented, and smooth rotation of the pin 2 is ensured. Therefore, it is possible to remove soil and sand from the outside.
It is necessary to prevent the intrusion of foreign substances such as dust. Therefore, a sealing member has been interposed between the two.

(Problem to be solved by the invention) Therefore, in the pin joint part of the conventional pin joint device, there is a gap 7 in the axial direction, and in the case of aerial operation such as turning, there is a gap 7 at the time of starting and stopping. There was a drawback that impact noise was generated due to collisions between the components of the structure. Originally, the gap 7 was provided in the axial direction to facilitate the work when manufacturing and assembling the machine or replacing parts, but on the other hand, in actual construction work, the gap 7 was There is a tendency for dirt, etc. to enter the gap 7, causing friction as the machine rotates, resulting in an increase in the gap 7. Therefore, in order not to increase the distance 7,
Although some efforts have been made, it is conceivable to make space 7 as narrow as possible. However, in places where there is mutual movement between multiple members facing each other, such as in a pin coupling device such as a hydraulic power shovel, even if minute dust enters the small gap between the multiple members, the dust will be removed. Depending on the nature of the pin coupling device, for example, it may be extremely hard, it may have an irregular shape, or other various reasons may cause serious problems in the functionality of the pin coupling device. In order to eliminate this kind of thing,
A pin coupling device described in the publication No. 52315 was developed.
The improvement of the pin coupling device is that hydraulic power shovels are generally used in work environments where they excavate and load earth and sand, which tends to generate dust. Therefore, there is a risk of dust entering the space between the bracket and the boss, and to prevent this, an O-ring is provided on the outside of the space between the bracket and the boss. It has been conventional practice to block the intrusion of dust. However, the reliability of blocking the intrusion of dust is not necessarily sufficient, and in addition to providing the O-ring, it is possible to adjust the gap by focusing on adjusting the gap. One of the improvements to the pin coupling device described in the publication of Japanese Utility Model Application No. 58-52315 is to embody this feature.
In addition, the conventional pin coupling device has the disadvantage that even if a gap occurs in the process of using the device, the gap cannot be adjusted. Spacer 2 as needed
Adjust the number of bolts 6, 36, and 48, or insert spacers of desired width, and tighten the bolts 25 of the fixing member.
Alternatively, one of the improvements in the pin coupling device described in the publication of U.S. Pat. It is one. However, with the method of adjusting the spacer like the pin coupling device described in the publication of Utility Model Application Publication No. 58-52315, it takes time to select a spacer that matches the width of the spacer, and in some cases, it takes time to select a spacer that matches the width of the spacer. There was a drawback that the gap could not be adjusted due to the lack of a spacer of an appropriate width or the lack of a spacer in time. Furthermore, the pin coupling device described in the publication of Utility Model Application No. 58-52315, as stated in the specification,
Manufacturing error between the pin bushing and the end face of the bracket,
Even if a gap occurs during the manufacturing stage due to assembly errors, or even if a gap occurs due to wear or external force during use, an adjustment member can be installed between the bracket on one side and the pin bushing. Since the adjusting member is fixed by the fixing member, the distance between the bracket and the pin bushing and between the pin bushing and the adjusting member can be easily adjusted by simply tightening the nut or bolt of the fixing member. It is recognized that they aimed at what they could do and made it effective. Further, the fixing members for fixing the adjustment members are plates 24, 32, 4.
6, one of the spacers 26, 36, 48, and a bolt 25. It is also stated that. If there is a gap between the bracket and pin bush, bracket, adjustment member, etc. due to manufacturing or assembly errors, loosen the bolt 25 and then remove the spacer inserted between the outer surface of the bracket and the plate. By tightening the bolt 25 again, the gap can be adjusted and eliminated. Both are stated. That is, plates 24, 32, 46 and spacer 2
6, 36, 48 and bolts 25, etc., it is assumed that there are manufacturing errors and assembly errors due to the parts, and the time when the error occurs during use of the product or the At the very least, if there is a gap that is large enough to cause a problem, perform regular inspections to find the gap, or adjust the number of spacers from time to time depending on the width of the gap that has occurred. The pin coupling device described in the publication of Japanese Utility Model Application No. 58-52315 is characterized in that it is inserted to match the width of the gap and the gap is adjusted by tightening the bolt 25. Therefore, in 1988,
As mentioned above, the invention described in the publication No. 52315 is limited to the manufacturing errors of the parts and the assembly errors caused by the parts when manufacturing the respective component parts such as the plates 24, 32, 46, the spacers 26, 36, 48, and the bolts 25. Even if such a thing were to occur, a spacer should be prepared in order to adjust the gap depending on the width of the gap that occurs in the pin coupling device.
Adjust the number of spacers and fit them to match the width between them. Only after the width between them is filled by multiple spacers, tighten the bolts 25 to adjust the width. In order to do this, it takes time and effort to select multiple spacers corresponding to the width between 〓, and then it is necessary to further tighten the bolts 25 and adjust the distance between 〓. If a male screw is provided at one end of 31, 41 and the male screw is to be tightened with a nut, a plate will be required, and the pin 3
In order to make the strength of the male screw part smaller than the diameter of pins 1 and 41 as strong as the other parts, it is necessary to make the diameter of pins 31 and 41 even larger or to improve the material of pins 31 and 41. Either way is required. This is something that cannot be left as is. Also pin 3
It is conceivable to avoid providing a male screw at one end of No. 1, 41. In that sense, Utsukai 58-
Figure 3 of the publication No. 52315 shows a plurality of bolts 2.
5 is used and is suitable for distributing the force to each bolt 25. However, in reality, it is not easy to perform the tightening work so that the load can be evenly applied to the plurality of bolts 25, and the tightening work must be performed carefully by a skilled person. Also, pin 2 described in the publication of Utility Model Application No. 58-52315
It can be said that this pin is superior to the aforementioned pins 31 and 41 in which a male screw is provided at the end in that there is no need to provide a male screw at the end of the pin. However, in reality, when tightening the bolt 25 toward the bracket through the plate 24 and spacer 26, if done in an appropriate manner, the spacer 26 between the outer surface of the bracket and the plate can maintain an appropriate distance. In this way, the adjustment member between the bracket and the pin bushing is made to occupy an appropriate position, but in reality, it is difficult to achieve the desired position, and the operator, even an experienced worker, has a hard time. In many cases, the tightening work is performed by Therefore, the pin coupling device described in the publication of Utility Model Application No. 58-52315 is not necessarily reliable in its ability to reliably block out the presence of dust filling the outside with just the adjustment member between the bracket and the pin bushing. It can be said that it is not sexual. Therefore, we are concerned with the use of the conventionally used O-ring 12, and from the fact that it continues to be used in Figures 3, 4, and 5, which are examples of the new invention, it is clear that the O-ring 12 is actually used. The necessity of using the O-ring 12 is acknowledged, and it is fully predicted that many problems will occur if the O-ring 12 is not used. It is an object of the present invention to solve the above problems. In particular, it is not necessary to use the sealing O-rings used in the respective drawings of Figures 3, 4, and 5, which are examples of the pin coupling device described in the publication of Utility Model Application No. 58-52315. The primary purpose is to reliably eliminate the intrusion of dust, and the spacer 26 in FIG. 3 and the spacer 3 in FIG.
6. The second purpose is to enable easy and reliable distance adjustment without using the spacer 48 in Fig. Compared to the conventional case where the screw part is easily damaged, the screw part is virtually not exposed to the outside, and compared to the pin coupling device described in the publication of Utility Model Application Publication No. 58-52315, the screw part is made less susceptible to external damage. Avoid damage to the parts, especially
The third purpose of the bracket is to prevent the screw portion from being exposed from external damage by effectively leaving the screw portion on the outside or outer surface side of the bracket.

(Means for Solving the Invention) The present invention provides a pin connection portion comprising a pin whose both ends are held by a pair of brackets, and a pin bush fitted into the pin and disposed between the brackets. A distance adjustment member having an end face opposite to one end face of the pin bushing is provided so that one end face of the pin bushing can be pressed at the position of the holding portion at the end of the pin, and a through hole provided with a female screw of one bracket is provided. The male screw of the distance adjustment member 14, which has a male screw provided on the outer periphery of the female screw, can be directly supported by screw connection, and the fixing member 16 is connected to the distance adjustment member 14. This is a distance adjusting device for a pin joint that is screwed and fixed.

(Function) The present invention provides for holding the ends of the pin in a pin joint portion consisting of a pin whose ends are held by a pair of brackets, and a pin bush fitted into the pin and disposed between the brackets. A gap adjusting member having an end face opposite to the end face of the pin bushing is provided so as to be able to press one end face of the pin bushing at the position of the pin bushing, and a female screw of the through hole provided with the female screw of one bracket is provided. The male screw of the spacing adjustment member 14 provided with a male screw on its outer periphery can be directly supported by screw connection, and the spacing adjustment member 14
The male screw provided on the outer periphery of the spacing adjustment member 14 protrudes slightly outward from the outer end of the female screw of the through hole provided with the female screw of one bracket. The two female screws are screwed together and fixed, and the male screw provided on the outer periphery of the spacing adjustment member 14, which protrudes slightly outward from the outer surface of one of the brackets, is tightened by the fixing member 16. This allows the fixing member 16 to protect the protruding male screw portion of the spacing adjustment member 14.

(Embodiment) An embodiment of the present invention will be described with reference to FIG. The spacing adjustment member 14 is inserted into the large diameter female threaded through hole in one of the brackets 11, and the male threaded portion of the spacing adjustment member 14 is screwed into the female threaded portion of the through hole of the bracket 11. One end of the pin 12 is accommodated in the recessed part of the spacing adjustment member 14, and the other end is pressed by a pressing member so that the male screw protruding from the spacing adjustment member 14 is pressed. This is a distance adjustment device for a pin joint part that can be protected by a fixing member 16.

(Effects) The present invention is capable of holding the ends of the pin in a pin joint portion consisting of a pin whose ends are held by a pair of brackets, and a pin bush fitted into the pin and disposed between the brackets. A distance adjustment member having an end face opposite to the end face of the pin bushing is provided so as to be able to press one end face of the pin bushing at the position of the pin bushing, and the male thread of one bracket is provided with a female thread of the through hole. The male screw of the spacing adjustment member 14 provided with a male screw on its outer periphery can be directly supported by screw connection, and the spacing adjustment member 14
The male screw provided on the outer periphery of the spacing adjustment member 14 protrudes slightly outward from the outer end of the female screw of the through hole provided with the female screw of one bracket. The female screws are screwed together and fixed, and the fixing member 16 protrudes slightly outward from the outer surface of one bracket.
This has the effect of tightening and fixing the male screw portion provided on the outer periphery of the spacing adjustment member 14, and protecting the protruding male screw portion of the spacing adjustment member 14 by the fixing member 16. In addition, during the manufacturing process of the parts used in the distance adjustment device of the pin joint of the present invention, we strive to eliminate manufacturing errors and assembly errors as much as possible, so that manufacturing errors and assembly errors are virtually eliminated. In particular, when manufacturing the male or female screws provided on the gap adjustment member 14 and the fixing member 16, and the female screws provided in the through hole of the bracket 11, we carefully examine the materials and improve the accuracy. By ensuring that the gap between the mutually facing end surfaces of the spacing adjustment member and the boss can be adjusted to the desired amount, it is possible to prevent dust or foreign matter from entering the gap, and to prevent dust or foreign matter from entering the gap due to wear during use or external force. 〓It is also necessary to eliminate the occurrence of gaps as much as possible. In this way, for example,
Unlike the pin connection device described in the publication, in which all the screw connection parts protrude outside the bracket 3, the distance adjustment device of the pin connection part of the present invention uses screw connection as much as possible. In order to prevent the part from protruding outside the bracket 11,
A female screw is provided in the through hole of the bracket 11 and screwed together with a male screw of the gap adjustment member 14, which has the effect of virtually eliminating the gap and preventing dust or foreign matter from entering from that part. . In addition, the rigidity of the pin 12 can be maintained without any processing such as threading on the pin 12, and it can withstand shearing. By moving the gap adjustment member 14 made of a screw member by a desired amount, the gap can be directly and easily eliminated.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the pin joint part adjustment device of the present invention, FIG. 2 is a side view showing the front structural part of a hydraulic power shovel, and FIG. The figure is a longitudinal sectional view showing a first example of a conventional pin coupling device, and FIG. 4 is a longitudinal sectional view showing a second example of a conventional pin coupling device. 11...Bracket, 12...Pin, 13...
Pin button, 14... Interval adjustment member, 15...
〓 Locking part of the rotation tool of the spacing adjustment member, 16...Fixing member.

Claims (1)

[Scope of utility model registration request] In a pin joint portion consisting of a pin held at both ends by a pair of brackets, and a pin bushing fitted into the pin and disposed between the brackets, the pin bushing is held at the position of the holding part at the end of the pin. A distance adjusting member having an end face opposite to the end face is provided so that one end face can be pressed, and a male thread is provided on the outer periphery of the female thread of the through hole provided with the female thread of one bracket. The male screw of the distance adjusting member 14 can be directly supported by screw connection, and the fixing member 16 is screwed and fixed to the distance adjusting member 14. Interval adjustment device.