JP4877084B2 - Hydraulic cylinder connection structure and construction machine having the same - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a hydraulic cylinder connecting structure used for a front attachment of a construction machine such as a hydraulic excavator and a construction machine having the same.

  Conventionally, as disclosed in Patent Document 1, a main boom that is connected to a construction machine main body so as to be raised and lowered and an arm to which a tip attachment such as a crusher is attached to the tip are provided. A hydraulic excavator having a separate boom to which a boom is connected is known.

  In a hydraulic cylinder that rotates an attachment such as a boom or an arm, if the parallelism of the pin insertion hole for inserting the connecting pin with the attachment is poor, an excessive force is applied to the cylinder, causing oil leakage or damage. In particular, in the case of a large attachment, since errors are likely to occur due to manufacturing accuracy, spherical bearings are often used for clevises (connection members) at both ends of the hydraulic cylinder. Further, since the bearing portion of the spherical bearing is usually narrower than the width of the clevis, it is generally mounted by positioning in the width direction with an annular spacer interposed between the bearing and the cylinder bracket.

For example, in a large hydraulic excavator, it is necessary to separate the arm from the front boom when disassembling and transporting due to problems such as transportation restrictions. In this case, when the hydraulic cylinder in which the tube side is connected to the front boom and the piston rod is connected to the arm is disconnected from the arm and reassembled, it is necessary to reconnect the hydraulic cylinder.
JP 2004-76524 A

  However, when the spherical bearing of a conventional hydraulic cylinder is rotating during assembly of the attachment, the rotation must be corrected, the pin holes must be aligned and the spacers must be inserted on both sides before inserting the pins. There was a problem that it was difficult. In particular, when two hydraulic cylinders are attached with one cylinder connecting pin at the same time, the above operation is required at two locations while passing the pin, and the installation operation of the hydraulic cylinder becomes difficult.

  In the case of two hydraulic cylinders, the pin hole must be aligned while adjusting the length of the other hydraulic cylinder after passing the pin through the hydraulic cylinder on one side, which also takes time. In the case of a large construction machine, it is necessary to suspend the hydraulic cylinder with a crane for alignment, and it takes time to work.

  When disassembling and transporting with the attachment removed, it is necessary to extend the hydraulic cylinder once contracted to prevent damage to the piston rod and align the pin holes. At this time, since the piston rod expands and contracts while rotating due to the influence of a processing flaw on the inner surface of the tube, it is necessary to return the rotated portion and align the holes. In the case of a machine that needs to be frequently disassembled and transported, there is a problem that work on the site is very difficult and time-consuming due to the above problems.

  The present invention has been made in view of such a point, and the object of the present invention is to prevent rotation of the spherical bearing in the connecting portion of the hydraulic cylinder, simplify the attaching / detaching operation of the hydraulic cylinder, and reduce the working time. It is to shorten.

  In order to achieve the above object, the present invention provides an anti-rotation member for preventing the rotation of the spherical bearing.

  Specifically, the first invention is directed to a connecting structure of a hydraulic cylinder that connects a connecting portion at the tip of the hydraulic cylinder and an attachment.

And the connection structure of this hydraulic cylinder is
A spherical bearing having a cylinder side pin insertion hole in the center and rotatably provided in the through hole of the connecting portion;
A cylinder support that is provided in the attachment and has an attachment-side pin insertion hole, and rotatably supports the connecting part;
A cylinder connecting pin inserted through the cylinder side pin insertion hole and the attach side pin insertion hole;
The rotation is inserted between the inner surface of the cylinder support portion and the outer surface of the spherical bearing so as to sandwich the connecting portion from both sides, and contacts the outer surface of the connecting portion and the outer surface of the spherical bearing to prevent the rotation of the spherical bearing. And a prevention member.

According to said structure, since the outer surface of a spherical bearing is pinched | interposed by the rotation prevention member contact | abutted to the outer surface of a connection part and a spherical bearing outer surface, it does not rotate. For this reason, the cylinder connecting pin is inserted into the cylinder side pin insertion hole and the attach side pin insertion hole without performing the troublesome task of positioning the spherical bearing.

In the second invention, in the first invention,
The rotation preventing member is
A pair of plate-like members that contact the outer surface of the connecting portion;
A pair of annular members that are provided in the center of the plate-like member and are inserted into the through-holes of the connecting portion and come into contact with the outer surface of the spherical bearing.

  According to the above configuration, the spherical member is held in the through hole of the connecting portion while holding the outer surface of the spherical bearing, and the plate-like member sandwiches the outer surface of the connecting member, so that the spherical bearing can be easily formed with a simple structure. Rotation is reliably prevented.

In the third invention, in the second invention,
The pair of plate-like members are fastened to each other by a plurality of fastening members so as to surround the outer periphery of the connecting portion, and are prevented from rotating relative to the connecting portion.

  According to the above configuration, by fastening the fastening member, the plate-like member securely holds the connecting portion, and the fastening member surrounding the connecting portion prevents relative rotation between the plate-like member and the connecting member. The connecting operation of the hydraulic cylinder is easily performed.

In the fourth invention, in the third invention,
Both ends of the fastening member are housed in a counterbore of the plate member.

  According to said structure, since a fastening member does not protrude from the surface of a plate-shaped member, when inserting the connection part pinched by the plate-shaped member in a cylinder support part, a plate-shaped member is not caught.

In a fifth invention, in any one of the second to fourth inventions,
The plate-like member is provided with a tapered portion directed inward toward the tip at an outer peripheral portion that comes into contact with the inner surface of the cylinder support portion when inserted into the cylinder support portion.

  According to the above configuration, when the connecting portion is inserted into the cylinder support portion, the taper portion of the plate-like member is the cylinder even if there is a slight shift in the axial direction of the through hole of the cylinder support portion with respect to the cylinder support portion. Since the connecting portion is guided to the cylinder supporting portion by contacting the inner surface of the supporting portion, the connecting operation of the hydraulic cylinder is easy.

In a sixth invention, in any one of the second to fifth inventions,
A suspension hole is formed through the upper end of the pair of plate-like members.

  According to the above-described configuration, the cylinder-side pin insertion hole and the attach-side pin insertion hole can be aligned by lifting the lifting tool through the suspension hole of the plate-like member, so that the portion directly above the connecting portion of the hydraulic cylinder can be lifted. Easy. Further, the self-weight prevents the hydraulic cylinder from rotating.

In a seventh invention, in the sixth invention,
The cylinder support portion is configured to be able to connect a pair of the hydraulic cylinders with the cylinder connecting pin.

  According to the above configuration, even when two hydraulic cylinders are connected to the cylinder support portion at the same time, the spherical bearing does not rotate, so that the mounting operation of the hydraulic cylinder is extremely easy. In this case, the number of cylinder connecting pins may be one or two.

In the eighth invention, in the seventh invention,
The pair of hydraulic cylinders are configured to be able to be lifted at the same time by a lifting tool attached to a suspension hole of the pair of plate-like members that cover the respective connecting portions.

  According to the above configuration, since two hydraulic cylinders can be lifted simultaneously, it is possible to align the cylinder side pin insertion hole and the attach side pin insertion hole without adjusting the length of each piston rod. The connecting operation of the hydraulic cylinder is easily performed.

In the ninth invention, in the eighth invention,
One lifting pin is inserted through the suspension holes of the two pairs of plate-like members that respectively cover the connecting portions of the pair of hydraulic cylinders.

  That is, when the piston rod of the hydraulic cylinder is expanded and contracted, the piston rod tries to rotate due to the influence of processing scratches on the inner surface of the tube, but according to the above configuration, one lifting pin is used. Since the pair of plate-like members are connected to each other, the rotation is prevented. For this reason, as in the prior art, the extra work of returning the amount of rotation of the piston rod and aligning the pin insertion holes is eliminated. Further, since it is possible to lift the pair of hydraulic cylinders while maintaining the mounting pitch, the insertion into the cylinder support portion is extremely easy.

In the tenth invention,
The construction machine includes the hydraulic cylinder connecting structure according to any one of the first to ninth inventions.

  According to the above configuration, since the connecting operation of the hydraulic cylinder can be easily performed, the disassembling and assembling operation of the construction machine is extremely easy.

  In the eleventh invention, the construction machine is a hydraulic excavator.

  According to the above configuration, disassembly and assembly work is easy even with a hydraulic excavator that is frequently recombined according to the work site and application.

As described above, according to the first invention, the rotation preventing member is inserted between the inner surface of the cylinder support portion and the outer surface of the spherical bearing so that the connecting portion is sandwiched from both sides, and the outer surface of the connecting portion and the spherical bearing. It is in contact with the outer surface . For this reason, rotation of the spherical bearing in the connecting portion of the hydraulic cylinder can be prevented to simplify the operation of attaching / detaching the hydraulic cylinder, and the working time can be greatly shortened.

  According to the second aspect of the present invention, the spherical bearing outer surface is pressed by the annular member inserted into the through hole of the connecting portion, and the outer surface of the connecting member is sandwiched by the plate-like member, so that the spherical surface has a simple structure. The rotation of the bearing can be reliably prevented and the hydraulic cylinder can be easily attached and detached.

  According to the third invention, the pair of plate-like members are fastened to each other by a plurality of fastening members so as to surround the outer periphery of the connecting portion, thereby preventing relative rotation of the plate-like member and the connecting member. The connecting operation of the hydraulic cylinder can be performed more easily.

  According to the fourth aspect of the invention, both ends of the fastening member are accommodated in the spot facing of the plate-like member so as not to protrude from the surface of the plate-like member, so that the connecting portion can be smoothly inserted into the cylinder support portion. can do.

  According to the fifth aspect of the present invention, the tapered portion is provided on the outer periphery of the plate-like member, and the tapered portion guides the connecting portion to the cylinder supporting portion. Can be inserted.

  According to the sixth aspect of the present invention, the cylinder-side pin insertion hole and the attachment can be achieved while preventing the hydraulic cylinder from rotating due to its own weight by allowing the suspension member to be lifted through the suspension hole in the suspension hole of the plate-like member. The alignment of the side pin insertion hole can be further facilitated.

  According to the seventh aspect of the invention, since the pair of hydraulic cylinders are connected to the cylinder support portion by the cylinder connecting pin, no hydraulic cylinders need to perform the positioning work of the spherical bearing, so two hydraulic cylinders are required. Even if it is a cylinder, the work time concerning the attachment can be reduced significantly.

  According to the eighth aspect of the invention, since the pair of hydraulic cylinders can be lifted simultaneously by the lifting tool attached to the suspension hole of the plate-like member, there is no need to adjust the lengths of the two hydraulic cylinders. Even two hydraulic cylinders can be connected very easily.

  According to the ninth aspect, a pair of hydraulic cylinders can be lifted at a time by inserting a single lifting pin into the suspension holes of a pair of plate-like members that cover the connecting portions of the hydraulic cylinders. Thus, the rotation of the piston rod can be prevented and the piston rod can be lifted while maintaining the mounting pitch of the pair of hydraulic cylinders, and the cylinder side pin insertion hole and the attach side pin insertion hole can be aligned very easily.

  According to the tenth aspect of the present invention, since the construction structure is provided with the hydraulic cylinder connecting structure of the present invention, the assembling and disassembling work can be performed very easily, so that the working efficiency is improved.

  According to the eleventh aspect of the present invention, by providing the hydraulic excavator with the connecting structure of the hydraulic cylinder, it is possible to obtain a highly excavated hydraulic excavator that is extremely easy to disassemble and assemble.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, a hydraulic excavator 1 as a construction machine according to an embodiment of the present invention includes a lower traveling body 2 and an upper revolving body 3 that is rotatably mounted on the lower traveling body 2. A main boom 4 is connected to the front portion 3a of the upper swing body 3 so as to be raised and lowered. The main boom 4 can be raised and lowered by a pair of right and left raising and lowering cylinders 5. By connecting various attachments to the main boom 4, the excavator 1 can be used for various purposes.

  In the present embodiment, a so-called separate boom is connected. That is, the front boom 6 is pin-coupled to the front end bracket 4a at the front end of the main boom 4 so as to be rotatable. The front boom 6 can be rotated by a jib cylinder 12 whose tube side is rotatably connected to the abdominal surface of the front boom 6 and whose rod side is rotatably connected to the abdominal surface of the main boom 4.

  An arm 7 is pin-connected to an end of the front boom 6 by an arm connecting pin 8. The arm 7 is rotatably connected to the rear surface of the front boom 6 by an arm cylinder 9 as a pair of hydraulic cylinders in which a piston rod 9 a is connected to the base end of the arm 7. Yes.

  An arm top pin insertion hole 11 is formed at the tip of the arm 7. An arm top pin 13 can be inserted into the arm top pin insertion hole 11, and the bucket 10 is pin-coupled by a bucket side link pin 14a as a tip attachment by the arm top pin 13. One end of the bucket link 14 is connected to the base end of the bucket 10, and the other end of the bucket link 14 is connected to the tip of the arm 7. The bucket 10 is pivotably connected to the rear side of the base end side of the arm 7 on the tube side, and can be rotated by a tip cylinder 16 connected to the bucket link 14 on the rod side by a rod side link pin 15. The tip attachment is not limited to the bucket 10 and may be a crusher or the like.

  As shown in an enlarged view in FIGS. 2 to 5, a clevis 20 as a connecting portion is provided at the tip of the piston rod 9 a of the arm cylinder 9. A spherical bearing 21 having a cylinder side pin insertion hole 21a at the center is provided in the through hole 20a of the clevis 20. The cylinder-side pin insertion hole 21a of the spherical bearing 21 that is not rotated is rotatable in both the clockwise and counterclockwise directions when viewed from the direction perpendicular to the axial direction of the through hole 20a. .

  On the base end side of the arm 7, a cylinder support portion 22 having an attach side pin insertion hole 22a is formed so as to protrude. Specifically, the cylinder support portion 22 has a central portion 22b and both end portions 22c standing with a gap between both ends of the central portion 22b, and the clevis 20 of each arm cylinder 9 is inserted into the two gaps. , So as to be pivotally supported. The center part 22b and the both end parts 22c each consist of a welded structure of a plurality of steel plates.

  A cylinder connecting pin 23 is inserted into the cylinder side pin insertion hole 21a and the attach side pin insertion hole 22a. One end of the cylinder connecting pin 23 is welded with a flange portion 23a for retaining and preventing rotation, and the flange portion 23a is fastened to the cylinder support portion 22 while being pressed by the plate 27. The cylinder support portion 22 is configured to be able to connect a pair of arm cylinders 9 with a single cylinder connection pin 23.

  An anti-rotation member 24 is inserted between the inner surface of the cylinder support portion 22 and the outer surface of the spherical bearing 21 so as to sandwich the clevis 20 from both sides. As shown in an enlarged view in FIG. 7, the rotation preventing member 24 includes a pair of plate-like members 25 that abut on the outer surface of the clevis 20. The plate-like member 25 is made of a substantially rectangular steel plate, and an annular member 26 having a through-hole 26a at the center is fitted in the center thereof. The annular member 26 is inserted into the through hole 20 a of the clevis 20 and is in contact with the outer surface of the spherical bearing 21. Thereby, the spherical bearing 21 is prevented from rotating, and the cylinder side pin insertion hole 21a and the attach side pin insertion hole 22a are positioned. Although the annular member 26 is formed separately from the plate-like member 25 because it requires precise machining, these may be formed integrally.

  The pair of plate-like members 25 includes a total of six bolt insertion portions 29 on the outer periphery thereof. A collar 29b having a bolt insertion hole 29a is welded to the back surface of the bolt insertion portion 29, whereby a counterbore 25a is formed on the outer periphery of the bolt insertion hole 29a. These bolt insertion holes 29a are arranged so as to surround the outer periphery of the clevis 20, and are fastened to each other by a plurality of fastening members 30 inserted through the bolt insertion holes 29a. As shown in FIG. 6, the fastening member 30 includes a rod-shaped member 30a having screw holes at both ends, and a bolt 30b fastened to the screw holes. The intermediate portion in the axial direction of the rod-shaped member 30a that is in contact with the clevis 20 and sandwiched from above and below is cut into a curved surface. Since the pair of plate-like members 25 are fastened by fastening the bolts 30b from both sides of the rod-like member 30a, even if the clevis 20 tries to rotate around the cylinder connecting pin 23 with respect to the pair of plate-like members 25, It abuts on the rod-shaped member 30a. For this reason, the rotation is prevented. The heads of the bolts 30 b at both ends of the fastening member 30 are housed in counterbore 25 a provided on the plate-like member 25.

  As shown in FIGS. 4 and 6, a taper portion 25 b toward the back side toward the tip is formed on the outer peripheral portion of the plate-like member 25 that contacts the inner surface of the cylinder support portion 22 when inserted into the cylinder support portion 22. Is formed. When the clevis 20 is held between the pair of plate-like members 25, the taper portions 25b are arranged so as to be directed inward toward the tip.

  A suspension hole 25 c is formed through the upper ends of the pair of plate-like members 25. The suspension hole 25 c is preferably on the center line of the plate-like member 25. As shown in FIG. 4, the pair of arm cylinders 9 is configured to be simultaneously liftable by a lifting tool 31 attached to a suspension hole 25 c of a pair of plate-like members 25 covering each clevis 20. The hanging tool 31 has a triangular hanging tool body 32 with rounded corners, a shackle 33 pin-coupled to the upper end of the hanging tool body 32, and a pin-coupled to both ends of the hanging tool body 32, and the pair of plate-like members. And a pin insertion portion 34 inserted between the suspension holes 25 c of the member 25. In a state where the pin insertion portion 34 is inserted between the suspension holes 25c of the pair of plate-like members 25, the lifting pins 35 are inserted. Thus, by lifting the shackle 33, the two arm cylinders 9 can be lifted at a time.

−Assembly assembly procedure−
Next, a procedure for assembling the arm 7 of the excavator 1 according to the present embodiment will be described.

  First, as shown in FIG. 8, a disassembly and transportation platform 50 on which the arm 7 is placed is prepared, and the arm 7 is connected to the front boom 6.

  Next, the arm cylinder 9 and the arm 7 are connected. Then, as shown in FIGS. 3 and 4, the anti-rotation member 24 is attached to each clevis 20, and a lifting tool 31 is attached to the pair of anti-rotation members 24, and the shackle 33 is lifted. At this time, since the top of the clevis 20 is lifted, positioning is easy. Moreover, since the two arm cylinders 9 are lifted simultaneously, it is not necessary to adjust the length of each. Since the relative rotation between the plate-like member 25 and the clevis 20 is prevented by the fastening member 30, the lifting work is stably performed.

  When the clevis 20 sandwiched between the rotation prevention members 24 is inserted into the cylinder support portion 22, even if there is a slight shift in the axial direction of the attach-side pin insertion hole 22a of the cylinder support portion 22, the plate-like member 25 The taper portion 25 b contacts the inner surface of the cylinder support portion 22 to guide the clevis 20 to the cylinder support portion 22. Further, since the fastening member 30 does not protrude from the surface of the plate-like member 25, the plate-like member 25 is not caught when the clevis 20 is inserted into the cylinder support portion 22.

  Next, the cylinder coupling pin 23 is inserted into the cylinder side pin insertion hole 21a, the attach side pin insertion hole 22a (and the through hole 26a of the annular member 26). At this time, since the outer surface of the spherical bearing 21 is sandwiched by the rotation preventing member 24, it does not rotate. For this reason, the cylinder connecting pin 23 is inserted into the cylinder side pin insertion hole 21a and the attach side pin insertion hole 22a without performing the troublesome work of aligning the spherical bearing 21. Specifically, the annular member 26 presses the outer surface of the spherical bearing 21 and the plate-like member 25 sandwiches the outer surface of the clevis 20 so that the rotation of the spherical bearing 21 is reliably prevented with a simple structure. For this reason, even when two arm cylinders 9 are attached at the same time with one cylinder connecting pin 23, it is not necessary to worry about the rotation of the spherical bearing 21, so that the arm cylinder 9 can be attached very easily. is there.

-Effect of the embodiment-
Therefore, according to the hydraulic cylinder connecting structure according to the present embodiment, the rotation preventing member 24 is inserted between the inner surface of the cylinder support portion 22 and the outer surface of the spherical bearing 21 so as to sandwich the clevis 20 from both sides. For this reason, rotation of the spherical bearing 21 in the clevis 20 of the arm cylinder 9 can be prevented to simplify the detaching operation of the arm cylinder 9, and the working time can be greatly shortened.

  According to the above embodiment, the outer surface of the spherical bearing 21 is pressed by the annular member 26 of the rotation preventing member 24 inserted into the through hole 20a of the clevis 20 and the outer surface of the clevis 20 is sandwiched by the plate-like member 25. Accordingly, the spherical bearing 21 can be reliably prevented from rotating with a simple structure, and the arm cylinder 9 can be easily attached and detached.

  According to the above embodiment, the pair of plate members 25 are fastened to each other by the plurality of fastening members 30 so as to surround the outer periphery of the clevis 20, thereby preventing relative rotation between the plate member 25 and the clevis 20. Thus, the connecting operation of the arm cylinder 9 can be performed more easily.

  According to the above embodiment, the heads of the bolts 30b at both ends of the fastening member 30 are accommodated in the spot facings 25a of the plate member 25 so as not to protrude from the surface of the plate member 25. It can be smoothly inserted into the cylinder support 22.

  According to the above embodiment, the taper portion 25b is provided on the outer periphery of the plate-like member 25, and the clevis 20 is guided to the cylinder support portion 22 by the taper portion 25b. It can be inserted into the part 22.

  According to the above-described embodiment, the cylinder-side pin insertion hole can be performed while preventing the arm cylinder 9 from rotating due to its own weight by allowing the suspension member 31 to be lifted up to the suspension hole 25c of the plate-like member 25 and preventing the rotation of the arm cylinder 9 due to its own weight. Positioning of 21a and the attach side pin insertion hole 22a can be performed very easily.

  According to the above embodiment, since the pair of arm cylinders 9 are connected to the cylinder support portion 22 by the single cylinder connection pin 23, none of the arm cylinders 9 needs to perform the positioning work of the spherical bearing 21. Therefore, even with the two arm cylinders 9, the working time required for the attachment can be greatly reduced.

  According to the above embodiment, since the pair of arm cylinders 9 can be lifted simultaneously by the lifting tool 31 attached to the suspension hole 25c of the plate-like member 25, the lengths of the two arm cylinders 9 need to be adjusted. Therefore, the connecting operation of the pair of arm cylinders 9 can be performed very easily.

  According to the above-described embodiment, by providing the hydraulic excavator 1 with the connecting structure of the arm cylinder 9 with good assembling and disassembling, the excavator 1 with high merchantability that can be easily assembled and disassembled can be obtained.

(Other embodiments)
The present invention may be configured as follows with respect to the above embodiment.

  That is, in the above-described embodiment, two lifting pins 35 are used, but one lifting pin 35 is passed through the suspension holes 25c of the pair of plate-like members 25 that cover the clevis 20 of each arm cylinder 9. Thus, the pair of arm cylinders 9 may be lifted at a time. As a result, the rotation of the piston rod 9a can be reliably prevented and the piston rod 9a can be lifted while maintaining the mounting pitch of the pair of arm cylinders 9, and the cylinder side pin insertion hole 21a and the attach side pin insertion hole 22a can be aligned. It can be done very easily.

  In the above embodiment, the pair of arm cylinders 9 are connected by the cylinder support portion 22 with the single cylinder connecting pin 23. However, the present invention may be applied by connecting the two cylinder connecting pins from the left and right with the two cylinder connecting pins. Applicable.

  In the above embodiment, the rotation preventing member 24 is provided on the clevis 20 of the piston rod 9a of the arm cylinder 9, but the rotation preventing member 24 may be provided on the tube-side clevis 20.

  In the above embodiment, the example of the arm cylinder 9 is shown as the hydraulic cylinder. However, the present invention is not limited to this, and the present invention can be applied to any hydraulic cylinder having the spherical bearing 21 on the clevis 20.

  In the above embodiment, an example of a hydraulic excavator is shown as a construction machine, but a crane or a civil engineering machine may be used.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or a use.

1 is a side view of a hydraulic excavator according to an embodiment of the present invention. It is an enlarged side view of the connection structure of an arm cylinder and its periphery. It is the III section enlarged side view of FIG. It is the IV-IV line expanded sectional view of FIG. It is a V direction arrow directional view of FIG. It is the VI-VI line expanded sectional view of FIG. It is a front view which expands and shows a rotation prevention member. It is a side view which shows a mode that the clevis of an arm cylinder is lifted. It is a side view which shows a mode that the cylinder connection pin was inserted.

Explanation of symbols

1 Excavator (construction machine)
7 Arm (attachment)
9 Arm cylinder (hydraulic cylinder)
20 Clevis (connection part)
20a Through hole 21 Spherical bearing 21a Cylinder side pin insertion hole 22 Cylinder support part 22a Attached side pin insertion hole 23 Cylinder connection pin 24 Anti-rotation member 25 Plate-like member 25a Counterbore 25b Taper part 25c Suspension hole 26 Annular member 30 Fastening member 31 Lifting tool 35 Lifting pin

Claims (11)

A hydraulic cylinder connecting structure for connecting a connecting portion and an attachment at the tip of the hydraulic cylinder,
A spherical bearing having a cylinder side pin insertion hole in the center and rotatably provided in the through hole of the connecting portion;
A cylinder support that is provided in the attachment and has an attachment-side pin insertion hole, and rotatably supports the connecting part;
A cylinder connecting pin inserted through the cylinder side pin insertion hole and the attach side pin insertion hole;
The rotation is inserted between the inner surface of the cylinder support portion and the outer surface of the spherical bearing so as to sandwich the connecting portion from both sides, and contacts the outer surface of the connecting portion and the outer surface of the spherical bearing to prevent the rotation of the spherical bearing. A hydraulic cylinder coupling structure comprising a prevention member. In the connection structure of the hydraulic cylinder according to claim 1,
The rotation preventing member is
A pair of plate-like members that contact the outer surface of the connecting portion;
A hydraulic cylinder coupling structure comprising: a pair of annular members provided in the center of the plate-like member and inserted into the through-holes of the coupling portion and coming into contact with the outer surface of the spherical bearing. In the connection structure of the hydraulic cylinder according to claim 2,
The hydraulic cylinder coupling structure, wherein the pair of plate-like members are fastened to each other by a plurality of fastening members so as to surround an outer periphery of the coupling portion, and are rotationally stopped with respect to the coupling portion. In the connection structure of the hydraulic cylinder according to claim 3,
The hydraulic cylinder coupling structure, wherein both ends of the fastening member are housed in a counterbore of the plate-like member. In the connection structure of the hydraulic cylinder according to any one of claims 2 to 4,
The plate-like member is provided with a taper portion that is inwardly directed toward the tip at an outer peripheral portion that contacts the inner surface of the cylinder support portion when inserted into the cylinder support portion. Construction. In the connection structure of the hydraulic cylinder according to any one of claims 2 to 5,
A connecting structure for a hydraulic cylinder, wherein a suspension hole is formed through the upper ends of the pair of plate-like members. In the connection structure of the hydraulic cylinder according to claim 6,
The hydraulic cylinder connecting structure, wherein the cylinder support portion is configured to be able to connect a pair of the hydraulic cylinders with the cylinder connecting pin. In the connection structure of the hydraulic cylinder according to claim 7,
The hydraulic cylinder coupling structure, wherein the pair of hydraulic cylinders are configured to be lifted simultaneously by a lifting tool attached to a suspension hole of the pair of plate-like members that cover the respective coupling portions. In the connection structure of the hydraulic cylinder according to claim 8,
A hydraulic cylinder coupling structure, wherein one lifting pin is inserted through the suspension holes of the two pairs of plate-like members respectively covering the coupling portions of the pair of hydraulic cylinders. A construction machine comprising the connecting structure for a hydraulic cylinder according to any one of claims 1 to 9.   The construction machine according to claim 10, wherein the construction machine is a hydraulic excavator.

Images