JP6201158B1 - Connecting device, construction machine and connecting pin removing device - Google Patents

Abstract

A connecting device capable of easily connecting a first component and a second component constituting a construction machine in a short time and a construction in which the first component and the second component are connected using the connecting device. Provided is a machine and a connecting pin removing device capable of removing the connecting pin in a short time. A central connection of a second part between an upstream connection part provided in the first part and a downstream connection part provided in the first part spaced from the upstream connection part downstream in the rotational axis direction. In the ready state of connection with the part interposed, the upstream hole formed in the upstream connection part, the central hole formed in the central connection part, and the downstream hole formed in the downstream connection part are inserted in the direction of the rotation axis. And a connecting pin for supporting the first component and the second component around the rotation axis, and the outer diameter of the connection pin continuously decreases in the direction of the rotation axis. [Selection] Figure 2

Description

  The present invention relates to a connecting device that rotatably connects a first component and a second component constituting a construction machine around a rotation axis, a construction machine using the connecting device, and a removal device that removes a connecting pin. It is.

  As examples of construction machines, hydraulic excavators and bulldozers are well known. For example, in a hydraulic excavator, components such as a boom, an arm, a bucket, and a hydraulic cylinder that operates these are attached to the front center portion of the upper swing body. Two of these components are connected to each other by a connecting pin so as to be rotatable about a rotation axis. For example, in a hydraulic excavator, a bucket is connected to an arm as an attachment. In addition, the connecting pin may be removed and replaced with another attachment (hydraulic breaker, crusher, steel cutting machine, etc.) from the bucket, and used for various operations such as excavation, transportation, stacking, crushing, and cutting. . Further, the arm and the boom are connected by the connecting pin as the two parts.

  As a connecting device using a connecting pin, for example, a device described in Patent Document 1 is known. In Patent Document 1, an arm hole formed at the tip of an arm of a construction machine and a connecting hole formed in a pair of connecting portions provided in the attachment with an interval in the rotating axis direction are in the rotating axis direction. After adjusting the positional relationship between the arm and the attachment so that they are arranged in a row, a connecting pin is inserted into the arm hole and the connecting hole so that the arm and the attachment are rotatably connected around the rotation axis. .

Registered Utility Model No. 3194803

  A conventional connecting pin has a circular shape in a cross section orthogonal to the rotation axis direction, and at least a diameter at a central portion inserted through the arm hole and the connecting hole is a constant value. It has a value slightly smaller than the pore diameter. For this reason, if the center axis of the arm hole and the center axis of the connection hole are slightly shifted in the plane orthogonal to the rotation axis, it becomes difficult to smoothly insert the connection pin into the arm hole and the connection hole. Even if the center axis of the arm hole and the center axis of the connection hole coincide with each other, it is difficult to insert the connection pin even when the axis of the connection pin is slightly inclined with respect to the rotation axis. Become.

  At the site where construction machinery is used, it is not always easy to align the center axis of the arm hole with the center axis of the connection hole, and to align the axis of the connection pin with the rotation axis. In particular, there is a problem that it takes time to insert the connecting pin into the arm hole and the connecting hole. Further, in order to shorten the time required for the attachment replacement work, it is desired to efficiently remove the connection pin not only for the connection pin insertion work but also for the connection pin removal work. Such a request is not limited to the connection between the arm and the attachment, but for all parts where the two parts constituting the construction machine are connected to each other by a connection pin so as to be rotatable around the rotation axis. There are similar demands.

  The present invention has been made in view of the above-described problems, and is a coupling device that can easily couple the first component and the second component constituting the construction machine in a short time, and uses the coupling device. It is an object of the present invention to provide a construction machine in which one part and a second part are connected, and a connecting pin removing device capable of removing the connecting pin in a short time.

A first aspect of the present invention is a connecting device for connecting a first part and a second part constituting a construction machine so as to be rotatable around a rotation axis, and an upstream connecting portion provided on the first part; In the ready state of connection, the central connecting part of the second part is inserted between the upstream connecting part and the downstream connecting part provided in the first part so as to be separated from the downstream side in the rotational axis direction. The first part and the second part are pivoted around the rotation axis by being inserted in the rotation axis direction with respect to the formed upstream hole, the center hole formed in the center connection part, and the downstream hole formed in the downstream connection part. A connecting pin to support, a tapered hole having a hole diameter that decreases in the direction of the rotation axis, an upstream bush that is attached to the upstream hole, and a taper hole in which the hole diameter decreases in the direction of the rotation axis; A central bush mounted in the central hole, and a tapered hole whose diameter decreases toward the rotation axis A, and a downstream bush mounted downstream hole, the outer diameter of the connecting pin has become continuously toward the rotation axis direction small, the upstream bush connection standby state, the central bushing and the downstream bush times A pin insertion hole that is arranged in the direction of the moving axis and can be fitted to the connecting pin is formed .

  A second aspect of the present invention is a construction machine, characterized in that the first component and the second component are rotatably connected around a rotation axis by the connecting device.

Further, the third aspect of the present invention is a connecting device for connecting the first part and the second part constituting the construction machine so as to be rotatable about the rotation axis, and an upstream connecting portion provided in the first part. The upstream connecting portion is in a ready state of connection with the central connecting portion of the second part interposed between the upstream connecting portion and the downstream connecting portion provided on the first component and spaced downstream from the upstream connecting portion. The first part and the second part are inserted around the rotation axis with respect to the upstream hole formed in the central connection part, the central hole formed in the central connection part, and the downstream hole formed in the downstream connection part. In a construction machine having a connecting pin that pivotally supports, wherein the outer diameter of the connecting pin is continuously reduced in the direction of the rotation axis, and the first part and the second part are connected by the connecting apparatus. This is a connecting pin detaching device for removing the connecting pin on the upstream side in the rotation axis direction. A screw member attached to the upstream end portion of the connecting pin in the axial direction, and a through hole for inserting the screw member is formed in the central portion, and the extending portion extends from the central portion toward the upstream connecting portion An engaging member whose tip is engaged with the upstream connecting portion, and a screwing member that is screwed into the screw member on the upstream side in the rotational axis direction with respect to the central portion of the engaging member. Screwing the screw member and the connecting pin to the first component and the second component while pushing the upstream connecting portion in the rotating shaft direction at the tip of the extending portion by screwing along the screw member to the downstream side in the rotating shaft direction. On the other hand, it is characterized by relative movement to the upstream side in the rotation axis direction.

  In the present invention configured as described above, the connecting pin whose outer diameter is continuously reduced toward the rotation axis direction is inserted through the upstream hole, the central hole, and the downstream hole in the rotation axis direction. The first component and the second component are pivotally supported around the rotation axis. Since the connecting pin having the tapered shape is used as described above, the time required for connecting the first component and the second component can be reduced and the connection can be easily performed.

  Moreover, a connection pin can be efficiently removed by using the above-mentioned removal apparatus.

It is a figure which shows the construction machine with which one Embodiment of the coupling device concerning this invention was applied. It is a fragmentary sectional view in the 1st rotation mode of the construction machine shown in FIG. It is a figure which shows typically the connection procedure of the bucket to the arm in the construction apparatus shown in FIG. It is a fragmentary sectional view in the 2nd rotation mode of the construction machine shown in FIG. It is a fragmentary sectional view of the construction machine shown in FIG. It is a figure which shows one Embodiment of the removal apparatus of the connection pin which concerns on this invention. It is a figure which shows one Embodiment of the removal apparatus of the connection pin which concerns on this invention. It is a fragmentary sectional view in the 3rd rotation mode of the construction machine shown in FIG.

  FIG. 1 is a diagram showing a construction machine to which an embodiment of a connecting device according to the present invention is applied. FIG. 2 is a partial cross-sectional view of the construction machine shown in FIG. FIG. 3 is a diagram schematically showing a procedure for connecting the bucket to the arm in the construction apparatus shown in FIG. 1. Here, a hydraulic excavator 10 is shown as an example of a construction machine. In this hydraulic excavator 10, an upper swing body 13 is mounted on a lower traveling body 11 via a swing mechanism 12 so as to be rotatable. The upper swing body 13 is provided with a cab 14 on one front side thereof, and a boom 15 is attached to the front center portion so as to be able to be raised and lowered. Further, an arm 16 is attached to the tip of the boom 15 so as to be rotatable up and down, and a bucket 17 is connected to the tip of the arm 16 so as to be rotatable around a rotation axis (axis perpendicular to the paper surface of FIG. 1). ing.

  In the present embodiment, two connecting portions 171 and 173 are attached to a part of the bucket 17. The connecting portions 171 and 173 are provided apart from each other in the axial direction of the rotation axis AX, that is, in the rotation axis direction X. In the present specification, the rotation axis direction X corresponds to the insertion direction of the connection pin when the connection pin, which is one component of the connection device described later, is mounted.

  The connecting portions 171 and 173 are respectively provided with tapered through holes (hereinafter referred to as “taper holes”). In each tapered hole, as shown in FIG. 2, the inner diameter of the opening on the upstream side (left hand side in FIG. 2) in the rotation axis direction X is wider than the inner diameter of the opening on the downstream side (right hand side in FIG. 2). The hole diameter decreases toward the rotation axis direction X. A truncated cone-shaped bush 211, which is a component of the coupling device 20 according to the present embodiment, is inserted into the tapered portion provided in the coupling portion 171 from the upstream side in the rotational axis direction X, and is coupled. A frustoconical bush 213 is fitted into the tapered hole provided in the portion 173 from the upstream side in the rotational axis direction X. In this specification, in order to distinguish the connecting portions 171, 173 and the bushes 211, 213, the connecting portion 171 located on the upstream side in the rotation axis direction X is referred to as an “upstream connecting portion”, while on the downstream side. The located connecting portion 173 is referred to as a “downstream connecting portion”, and the bushes 211 and 213 are referred to as an “upstream bush” and a “downstream bush”, respectively.

  Further, the distal end portion of the arm 16 corresponds to an example of the “central coupling portion” of the present invention, and a tapered hole is formed in the central coupling portion 161 similarly to the upstream coupling portion 171 and the downstream coupling portion 173. In addition, a truncated cone-shaped bush 212 is fitted into the tapered hole from the upstream side in the rotational axis direction X.

As described above, in the present embodiment, the three bushes 211 to 213 are arranged in this order along the rotation axis direction X. Taper holes 221 to 223 are formed in the bushes 211 to 213, respectively. That is, in each of the bushes 211 to 213, the inner diameter of the opening on the upstream side (left hand side in FIG. 2) in the rotational axis direction X is larger than the inner diameter of the opening on the downstream side (right hand side in FIG. 2). Is formed. As shown in FIG. 3, the inner diameters d3 to d8 have the following dimensional relationship, that is, d3>d4≈d5>d6≈d7> d8.
However,
d3: inner diameter of the upstream opening of the bush 211,
d4: inner diameter of the downstream opening of the bush 211,
d5: inner diameter of the upstream opening of the bush 212,
d6: inner diameter of the downstream opening of the bush 212,
d7: inner diameter of the upstream opening of the bush 213,
d8: inner diameter of the downstream opening of the bush 213,
have. For this reason, in a state where the central coupling portion 161 is interposed between the upstream coupling portion 171 and the downstream coupling portion 173 (corresponding to the “connection preparation state” of the present invention), as shown in FIG. 223 are arranged in a line along the rotation axis direction X to form a tapered hole 22. That is, in the taper hole 22, the inner diameter d3 of the opening on the upstream side (left hand side in FIG. 2) in the rotation axis direction X is wider than the inner diameter d8 of the opening on the downstream side (right hand side in FIG. 2). The hole diameter gradually decreases in the axial direction X. The taper hole 22 functions as a “pin insertion hole” for inserting a connection pin 23 described below.

  The connecting pin 23 is a metal rod-like member extending in the rotation axis direction X, and has a tapered shape. The outer diameter of the connecting pin 23 in the rotational axis direction X is larger at the upstream end 231 than the upstream opening of the bushing 211 (outer diameter d1> inner diameter d3), and is approximately the same as the inner diameter change rate at the pin insertion hole 22. At the downstream end portion 233, which is the same or slightly smaller than the downstream opening of the bush 213 (outer diameter d2≈inner diameter d8, or outer diameter). d2 <inner diameter d8). For this reason, even if the downstream end 233 of the connecting pin 23 is not completely coincident with the central axis of the pin insertion hole 22, the connecting pin 23 can be easily moved in the rotation axis direction X with respect to the pin insertion hole 22. Can be inserted into. The central portion 232 of the connecting pin 23 thus inserted is slidably fitted to the bushes 211 to 213 through the pin insertion hole 22, and the arm 16 and the bucket 17 are pivoted about the pivot axis AX. Support. Note that the connecting pin 23 does not further move in the rotation axis direction X when the central portion 232 of the connecting pin 23 is fitted to the bushes 211 to 213. Further, in order to prevent the connecting pin 23 from coming off to the upstream side in the rotational axis direction X while the arm 16 and the bucket 17 are connected, a retaining mechanism 24 is provided.

  The retaining mechanism 24 includes a screw part 241 attached to the downstream end 233 of the connecting pin 23, a washer 242, and a nut 243 that can be screwed into the screw part 241. For this reason, it is possible to prevent the connecting pin 23 from coming off by tightening the nut 243 so that the washer 242 is engaged with the bush 211.

  In the present embodiment, the central portion 232 of the connecting pin 23 is slidably provided with the bushes 211 to 213. However, in order to control the wear of the connecting pin 23 and the bushes 211 to 213 accompanying the rotation operation, 3 Two bolts 251 to 253 are provided. That is, the bolt 251 that functions as the “upstream fixing member” of the present invention is attached to the upstream connecting portion 171. By operating this bolt 251, the upstream bush 211 and the upstream connecting portion 171 can be fixed to the connecting pin 23 fitted in the pin insertion hole 22. Further, a bolt 252 that functions as a “center fixing member” of the present invention is attached to the central connecting portion 161, and the central bushing is connected to the connecting pin 23 fitted into the pin insertion hole 22 by the operation of the bolt 252. 212 and the center connecting part 161 can be fixed. Further, a bolt 253 that functions as a “downstream fixing member” of the present invention is attached to the downstream connecting portion 173, and the downstream bushing is connected to the connecting pin 23 fitted into the pin insertion hole 22 by the operation of the bolt 253. 211 and the downstream connection part 173 can be fixed. Therefore, as shown in FIG. 2, the upstream bush 211, the upstream connection portion 171, and the downstream bush are connected to the connection pin 23 fitted into the pin insertion hole 22 by the bolts 251 and 253 while being fixed by the bolt 252. By fixing 213 and the downstream connecting portion 173, when the bucket 17 rotates relative to the arm 16, the connecting pin 23 slides only on the central bush 212 and the upstream bush 211 and the downstream bush 213 Wear can be prevented (first rotation mode). On the contrary, as shown in FIG. 4, when the bolt fixing mode is reversed, the connection pin 23 slides only on the upstream bush 211 and the downstream bush 213 when the bucket 17 rotates relative to the arm 16. Thus, wear with the central bush 212 can be prevented (second rotation mode). Therefore, the wear state can be made uniform by selectively switching the first rotation mode and the second rotation mode in accordance with the wear state of the bushes 211 to 213 and the connecting pin 23, and the bushes 211 to 213 and The replacement life of the connecting pin 23 can be extended.

  As the wear of the bushes 211 to 213 and the connecting pin 23 progresses, a clearance is generated between the central portion 232 of the connecting pin 23 and the bushes 211 to 213, which causes a rattling at the connecting portion, vibration of the excavator 10, and the like. May be a factor. However, in the present embodiment, since the tapered connecting pin 23 is used, as shown in FIG. 5, the connecting pin 23 is moved in the rotation axis direction X according to the wear state, and the center of the connecting pin 23 is again formed. The clearance may be eliminated by fitting the part 232 to the bushes 211 to 213. In this case, a washer 242 may be added corresponding to the amount of movement of the connecting pin 23.

  2 to 5, the screw hole 26 is provided in the upstream end portion 231 of the connecting pin 23. This is used when the connecting pin 23 is removed by a removing device described below. .

  6 and 7 are views showing an embodiment of a connecting pin removing device according to the present invention. FIG. 6 shows a mounting procedure of the removing device to the connecting device, while FIG. The removal procedure of a connecting pin is shown. In this embodiment, in order to remove the connecting pin 23 fitted to the bushes 211 to 213 to the upstream side in the rotational axis direction X (the left hand side in these drawings), the detaching device 30 is connected to the connecting pin 23. And detachable. The detaching device 30 includes a screw member 31, an engaging member 32, and a nut 33. The screw member 31 is configured such that the downstream end portion of the screw member 31 in the rotation axis direction X is detachable from the screw hole 26 provided in the upstream end portion 231 of the connecting pin 23 in the rotation axis direction X. . When the normal operation is performed by the excavator 10, the screw member 31 is removed from the screw hole 26.

  On the other hand, when the connecting pin 23 is removed, the downstream end of the screw member 31 in the rotational axis direction X is screwed into the screw hole 26 and integrated with the connecting pin 23. In order to reliably prevent the screw member 31 from coming off from the connecting pin 23, a retaining nut 34 is provided. An engaging member 32 is attached to the screw member 31 thus integrated.

  The engaging member 32 has a flat plate-like central portion 321 and an extending portion 322 extending from the central portion 321 toward the upstream connecting portion 171. A through hole is provided in the central portion 321, and the engaging member 32 can be mounted from the upstream end portion of the screw member 31 toward the connecting pin 23 while the central portion 321 is inserted into the screw member 31. By attaching the engaging member 32, the distal end of the extending portion 322 can be engaged with the upstream connecting portion 171. In this embodiment, the two extended portions 322 are extended symmetrically with respect to the axial direction of the screw member 31 from the central portion 321, but the shape and number of the extended portions 322 are limited to this. Instead, the extended portions 322 may be finished in a cup shape, or three or more extended portions 322 may be provided radially at equal angular intervals with the axial direction of the screw member 31 as the axis of symmetry.

  On the upstream side in the rotational axis direction X with respect to the central portion 321 of the engaging member 32, the nut 33 is screwed into the screw member 31 as the “screwing member” of the present invention. As shown by arrows AR1 and AR2 in FIG. 6, the fixing of the connecting pin 23 and the bushes 211 and 213 by the bolts 251 and 253 is released, and the nut 243 is removed from the screw portion 241 as shown by the arrow AR3. In this state, the connecting pin 23 is removed by screwing the nut 33 along the screw member 31 downstream in the rotational axis direction X as indicated by an arrow AR4. That is, as the nut 33 is screwed, the tip of the extending portion 322 presses the upstream connecting portion 171 in the rotation axis direction X. At this time, as shown in FIG. 7, the connecting pin 23, the screw member 31, the engagement member 32, and the retaining nut 34 are integrally moved upstream of the arm 16 and the bucket 17 in the rotational axis direction X by reaction force. The connecting pin 23 is removed by relative movement.

  Since the removal amount at this time is shorter than the axial length of the connection pin 23, it is difficult to perform the removal work by the worker alone, so the connection pin 23 is pulled out by the work machine while the removal device 30 is mounted, After complete removal of the connecting pin 23, the detaching device 30 is removed from the connecting pin 23. Here, the removal timing of the removal device 30 from the connection pin 23 is not limited to this. For example, after removing the removal device 30, a connection portion such as a hook is attached to the screw hole 26, and the patent You may remove by the method of literature 1. Thus, the connection pin 23 can be easily removed by using the detaching device 30.

  In the embodiment described above, the bucket 17 and the arm 16 correspond to examples of the “first part” and the “second part” of the present invention, respectively. Further, the tapered hole provided in the upstream connecting portion 171, the tapered hole provided in the central connecting portion 161, and the tapered hole provided in the downstream connecting portion 173 are the “upstream hole”, “center hole” and “ This corresponds to an example of “downstream hole”.

The present invention is not limited to the above-described embodiment, and various modifications other than those described above can be made without departing from the spirit of the present invention. For example, in the above embodiment, the first rotation mode and the second rotation mode can be selectively switched. However, for example, as shown in FIG. 8, all the fixing of the connecting pin 23 by the bolts 251 to 253 is released. Then, the third rotation mode in which the bucket 17 rotates relative to the arm 16 while the connecting pin 23 slides on all the bushes 211 to 213 may be appropriately implemented.

  In the above embodiment, the coupling device 20 is used for coupling the bucket 17 and the arm 16, but the application place of the coupling device 20 is not limited to this, and a hydraulic breaker, Similar effects can be obtained when the attachment device according to the present invention is applied to connecting other attachments such as a machine, a steel cutting machine, or other components in the excavator 10, such as an arm and a boom. .

  Moreover, in the said embodiment, although the removal of the connection pin 23 is performed by the removal apparatus 30, you may use the removal method described in patent document 1. FIG.

  The present invention relates to a connecting device that rotatably connects a first component and a second component constituting a construction machine around a rotation axis, a construction machine using the connecting device, and removal of a connecting pin for removing the connecting pin. It can be applied to all devices.

10 ... Hydraulic excavator (construction machine)
16 ... arm (second part)
17 ... Bucket (first part)
20 ... Connector 221 ... Tapered hole (upstream hole)
222: Tapered hole (center hole)
223: Tapered hole (downstream hole)
DESCRIPTION OF SYMBOLS 22 ... Pin insertion hole 23 ... Connection pin 26 ... Screw hole 30 ... Removal apparatus 31 ... Screw member 32 ... Engagement member 33 ... Nut (screwing member)
161 ... Central connecting portion 171 ... Upstream connecting portion 173 ... Downstream connecting portion 211 ... Upstream bushing 212 ... Central bushing 213 ... Downstream bushing 231 ... Upstream end portion (of the connecting pin) 232 ... Central portion of the connecting pin 233 (Connecting) Downstream end portion 321 of pin (center of engagement member) 322 Extension portion of engagement member AX rotation axis X rotation axis direction

Claims (6)

A connecting device for connecting a first part and a second part constituting a construction machine so as to be rotatable around a rotation axis,
The central connection of the second part between the upstream connection part provided in the first part and the downstream connection part provided in the first part so as to be separated from the upstream connection part on the downstream side in the rotation axis direction. The rotation shaft with respect to the upstream hole formed in the upstream connection part, the central hole formed in the central connection part, and the downstream hole formed in the downstream connection part in a connection preparation state in which a part is inserted A connecting pin that is inserted in a direction and pivotally supports the first part and the second part around the rotation axis;
An upstream bushing that has a tapered hole with a hole diameter that decreases in the direction of the rotation axis, and that is attached to the upstream hole;
A central bush that has a tapered hole with a hole diameter that decreases in the direction of the rotation axis, and that is attached to the central hole;
A taper hole having a hole diameter that decreases in the direction of the rotation axis, and a downstream bush mounted in the downstream hole,
The outer diameter of the connecting pin is continuously reduced toward the rotation axis direction,
The coupling device, wherein the upstream bushing, the central bushing, and the downstream bushing are arranged in the rotational axis direction in the coupling preparation state to form a pin insertion hole that can be fitted to the coupling pin. The connecting device according to claim 1 ,
An upstream fixing member that fixes the upstream bushing and the upstream connecting portion to the connecting pin fitted in the pin insertion hole,
A downstream fixing member that fixes the downstream bush and the downstream connection portion to the connection pin fitted in the pin insertion hole,
A coupling device that slides the coupling pin only on the central bush when the first component rotates relative to the second component. The connecting device according to claim 1 ,
A central fixing member for fixing the central bush and the central coupling portion to the coupling pin fitted in the pin insertion hole,
A coupling device that slides the coupling pin only on the upstream bush and the downstream bush when the first component rotates relative to the second component. The connecting device according to claim 1 ,
An upstream fixing member capable of fixing the upstream bushing and the upstream connecting portion to the connecting pin fitted in the pin insertion hole;
A central fixing member capable of fixing the central bush and the central coupling part to the coupling pin fitted in the pin insertion hole,
A downstream fixing member capable of fixing the downstream bush and the downstream connection portion to the connection pin fitted in the pin insertion hole,
The upstream bushing, the upstream coupling part, the downstream bushing and the downstream coupling part are fixed to the coupling pin fitted in the pin insertion hole by the upstream fixing member and the downstream fixing member. A first rotation mode in which the connecting pin slides only on the central bush when the component rotates relative to the second component;
The central bushing and the central coupling portion are fixed to the coupling pin fitted in the pin insertion hole by the central fixing member, and the first component rotates relative to the second component. And a second rotation mode in which the connecting pin slides only on the upstream bush and the downstream bush when the connecting pin is selectively executed. A construction machine characterized in that the first component and the second component are pivotally coupled around a pivot axis by the coupling device according to any one of claims 1 to 4 . A connecting device for connecting a first part and a second part constituting a construction machine so as to be rotatable around a rotating shaft, wherein the upstream connecting portion provided in the first part and the rotating shaft from the upstream connecting portion are provided. An upstream formed in the upstream connecting portion in a ready state of connection in which the central connecting portion of the second part is inserted between the downstream connecting portion provided in the first part and separated from the downstream side in the direction A hole, a central hole formed in the central connecting portion, and a downstream hole formed in the downstream connecting portion are inserted in the direction of the rotating shaft so that the first component and the second component are rotated around the rotating shaft. to a connecting pin for pivotally supporting said connecting outer diameter of the pin is smaller continuously toward the rotation axis direction, removing the connecting pin of the coupling device on the upstream side of the rotational axis A connecting pin removing device,
A screw member attached to an upstream end of the connecting pin in the rotation axis direction;
An engagement member in which a through hole for inserting the screw member is formed in a central portion, and a distal end of an extending portion extending from the central portion toward the upstream connecting portion engages with the upstream connecting portion When,
A screwing member to be screwed to the screw member on the upstream side in the rotational axis direction with respect to the central portion of the engaging member;
The screw member and the screw member, while pushing the upstream connecting portion in the direction of the rotation axis at the tip of the extending portion by screwing along the screw member to the downstream side in the direction of the rotation axis. An apparatus for removing a connecting pin, wherein the connecting pin is moved relative to the first part and the second part in the upstream in the rotational axis direction.

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