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

Connecting device, construction machine and connecting pin removing device Download PDF

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JP6201158B1
JP6201158B1 JP2017075669A JP2017075669A JP6201158B1 JP 6201158 B1 JP6201158 B1 JP 6201158B1 JP 2017075669 A JP2017075669 A JP 2017075669A JP 2017075669 A JP2017075669 A JP 2017075669A JP 6201158 B1 JP6201158 B1 JP 6201158B1
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神島　昭男
昭男 神島
充子 神島
充子 神島
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株式会社神島組
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Abstract

【課題】建設機械を構成する第１部品と第２部品とを短時間で、かつ容易に連結することができる連結装置、当該連結装置を用いて第１部品および第２部品が連結された建設機械、ならびに連結ピンの取り外しを短時間で行うことができる連結ピンの取外装置を提供する。【解決手段】第１部品に設けられた上流連結部と上流連結部から回動軸方向の下流側に離間して第１部品に設けられた下流連結部との間に第２部品の中央連結部を介挿させた連結準備状態で、上流連結部に形成された上流孔、中央連結部に形成された中央孔および下流連結部に形成された下流孔に対して回動軸方向に挿通されて第１部品および第２部品を回動軸まわりに軸支する連結ピンを備え、 連結ピンの外径が回動軸方向に向かって連続的に小さくなっている。【選択図】図２A 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

この発明は、建設機械を構成する第１部品と第２部品とを回動軸まわりに回動自在に連結する連結装置、当該連結装置を用いた建設機械および連結ピンを取り外す取外装置に関するものである。   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.

建設機械の一例としては、油圧ショベルやブルドーザー等が周知である。例えば油圧ショベルでは、上部旋回体の前方中央部にブーム、アーム、バケット及びこれらを作動させる油圧シリンダなどの部品が取付けられている。これらの部品のうちの二部品同士が連結ピンによって回動軸まわりに回動自在に連結されている。例えば油圧ショベルでは、アームに対してバケットがアタッチメントとして連結されている。また、連結ピンを取り外し、バケットから別のアタッチメント（油圧ブレーカ、大割機、鉄骨切断機など）に交換して、掘削、搬送、積み上げ、破砕、切断等の種々の作業に使用することもある。また、アームとブームとを上記二部品として連結ピンで連結している。   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.

連結ピンを用いた連結装置としては、例えば特許文献１に記載の装置が知られている。特許文献１では、建設機械のアームの先端部に形成されたアーム孔と、回動軸方向に間隔をあけてアタッチメントに設けられた一対の連結部に形成された連結孔とが回動軸方向に一列に配列するようにアームとアタッチメントとの位置関係を調整した後でアーム孔と連結孔とに連結ピンを挿通して、アームとアタッチメントを回動軸回りに回動自在に連結している。   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. .

登録実用新案第３１９４８０３号公報Registered Utility Model No. 3194803

従来の連結ピンは回動軸方向に対して直交する断面において円形形状を有しており、少なくともアーム孔と連結孔とに挿通される中央部における直径は一定値であり、アーム孔および連結孔の孔径よりも若干小さい値を有している。このため、回動軸と直交する面内においてアーム孔の中心軸と連結孔の中心軸とがわずかでもずれると、アーム孔および連結孔に対して連結ピンを円滑に挿通させることが難しくなる。また、アーム孔の中心軸と連結孔の中心軸とが一致していたとしても、連結ピンの軸心が回動軸に対して僅かでも傾斜している場合にも、連結ピンの挿通が難しくなる。   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.

建設機械を用いる現場において、アーム孔の中心軸と連結孔の中心軸とを一致させ、しかも連結ピンの軸心を回動軸に一致させることは必ずしも容易ではなく、アームへのアタッチメントの装着作業、特にアーム孔および連結孔への連結ピンの挿通作業に時間がかかるという問題が発生している。また、アタッチメントの交換作業に要する時間を短縮するためには、連結ピンの挿通作業のみならず、連結ピンの取外作業についても、連結ピンの取り外しを効率的に行うことが望まれている。なお、このような要望はアームとアタッチメントとの連結に限定されるものではなく、建設機械を構成する二部品同士を連結ピンによって回動軸まわりに回動自在に連結している箇所全般に対して同様の要望が存在している。   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.

この発明は、上記課題に鑑みなされたものであり、建設機械を構成する第１部品と第２部品とを短時間で、かつ容易に連結することができる連結装置、当該連結装置を用いて第１部品および第２部品が連結された建設機械、ならびに連結ピンの取り外しを短時間で行うことができる連結ピンの取外装置を提供することを目的とする。   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.

本発明の第１態様は、建設機械を構成する第１部品と第２部品とを回動軸まわりに回動自在に連結する連結装置であって、第１部品に設けられた上流連結部と上流連結部から回動軸方向の下流側に離間して第１部品に設けられた下流連結部との間に第２部品の中央連結部を介挿させた連結準備状態で、上流連結部に形成された上流孔、中央連結部に形成された中央孔および下流連結部に形成された下流孔に対して回動軸方向に挿通されて第１部品および第２部品を回動軸まわりに軸支する連結ピンと、回動軸方向に向かって孔径が小さくなるテーパ孔を有し、上流孔に装着される上流ブッシュと、回動軸方向に向かって孔径が小さくなるテーパ孔を有し、中央孔に装着される中央ブッシュと、回動軸方向に向かって孔径が小さくなるテーパ孔を有し、下流孔に装着される下流ブッシュとを備え、連結ピンの外径が回動軸方向に向かって連続的に小さくなっており、連結準備状態で上流ブッシュ、中央ブッシュおよび下流ブッシュが回動軸方向に配列して連結ピンと嵌合可能なピン挿通孔が形成されることを特徴としている。 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 .

また、本発明の第２態様は、建設機械であって、上記連結装置により第１部品と第２部品とが回動軸まわりに回動自在に連結されていることを特徴としている。   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.

さらに、本発明の第３態様は、建設機械を構成する第１部品と第２部品とを回動軸まわりに回動自在に連結する連結装置であって第１部品に設けられた上流連結部と上流連結部から回動軸方向の下流側に離間して第１部品に設けられた下流連結部との間に第２部品の中央連結部を介挿させた連結準備状態で、上流連結部に形成された上流孔、中央連結部に形成された中央孔および下流連結部に形成された下流孔に対して回動軸方向に挿通されて第１部品および第２部品を回動軸まわりに軸支する連結ピンを備え、 連結ピンの外径が回動軸方向に向かって連続的に小さくなっている、連結装置により第１部品と第２部品とが連結された建設機械において、連結装置の連結ピンを回動軸方向の上流側に取り外す連結ピンの取外装置であって、回動軸方向における連結ピンの上流端部に装着されるネジ部材と、ネジ部材を挿通するための貫通孔が中央部に形成されるとともに中央部から上流連結部に向かって延設された延設部の先端が上流連結部と係合する係合部材と、係合部材の中央部に対して回動軸方向の上流側でネジ部材に螺合される螺合部材とを備え、螺合部材がネジ部材に沿って回動軸方向の下流側に螺進することで延設部の先端で上流連結部を回動軸方向に押圧しながらネジ部材および連結ピンを第１部品および第２部品に対して回動軸方向の上流側に相対移動させることを特徴としている。 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.

以上のように構成された本発明では、外径が回動軸方向に向かって連続的に小さくなっている連結ピンを、上流孔、中央孔および下流孔に対して回動軸方向に挿通して第１部品および第２部品を回動軸まわりに軸支して連結している。このように先細り形状を有する連結ピンを用いているため、第１部品と第２部品との連結に要する時間を短縮し、かつ容易に連結することができる。   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.

また、上記した取外装置を用いることで連結ピンを効率的に取り外すことができる。   Moreover, a connection pin can be efficiently removed by using the above-mentioned removal apparatus.

本発明にかかる連結装置の一実施形態が適用された建設機械を示す図である。It is a figure which shows the construction machine with which one Embodiment of the coupling device concerning this invention was applied. 図１に示す建設機械の第１回動モードにおける部分断面図である。It is a fragmentary sectional view in the 1st rotation mode of the construction machine shown in FIG. 図１に示す建設装置におけるアームへのバケットの連結手順を模式的に示す図である。It is a figure which shows typically the connection procedure of the bucket to the arm in the construction apparatus shown in FIG. 図１に示す建設機械の第２回動モードにおける部分断面図である。It is a fragmentary sectional view in the 2nd rotation mode of the construction machine shown in FIG. 図１に示す建設機械の部分断面図である。It is a fragmentary sectional view of the construction machine shown in FIG. 本発明に係る連結ピンの取外装置の一実施形態を示す図である。It is a figure which shows one Embodiment of the removal apparatus of the connection pin which concerns on this invention. 本発明に係る連結ピンの取外装置の一実施形態を示す図である。It is a figure which shows one Embodiment of the removal apparatus of the connection pin which concerns on this invention. 図１に示す建設機械の第３回動モードにおける部分断面図である。It is a fragmentary sectional view in the 3rd rotation mode of the construction machine shown in FIG.

図１は本発明にかかる連結装置の一実施形態が適用された建設機械を示す図である。図２は図１に示す建設機械の部分断面図である。図３は図１に示す建設装置におけるアームへのバケットの連結手順を模式的に示す図である。ここでは、建設機械の一例として油圧ショベル１０が示されている。この油圧ショベル１０では、下部走行体１１の上に旋回機構１２を介して上部旋回体１３が旋回自在に載置されている。上部旋回体１３にはその前方一側部にキャブ１４が設けられ、且つ、前方中央部にブーム１５が俯仰可能に取り付けられている。更に、ブーム１５の先端にアーム１６が上下回動自在に取り付けられ、さらにアーム１６の先端にバケット１７が回動軸（図１の紙面に対して垂直な軸）まわりに回動自在に連結されている。   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.

本実施形態では、バケット１７の一部に２つの連結部１７１、１７３が取り付けられている。連結部１７１、１７３は、回動軸ＡＸの軸心方向、つまり回動軸方向Ｘにおいて互いに離間して設けられている。なお、本明細書では、回動軸方向Ｘは、後で説明する連結装置の一構成要素である連結ピンを装着する際の連結ピンの挿入方向に相当している。   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.

連結部１７１、１７３にはテーパ状の貫通孔（以下「テーパ孔」という）がそれぞれ穿設されている。各テーパ孔では、図２に示すように、回動軸方向Ｘの上流側（図２中の左手側）の開口の内径が下流側（図２中の右手側）の開口の内径よりも広く、回動軸方向Ｘに向かって孔径が小さくなるように形成されている。そして、連結部１７１に設けられたテーパ孔に対し、本実施形態に係る連結装置２０の一構成部品である円錐台形状のブッシュ２１１が回動軸方向Ｘの上流側から嵌入されるとともに、連結部１７３に設けられたテーパ孔に対して円錐台形状のブッシュ２１３が回動軸方向Ｘの上流側から嵌入されている。なお、本明細書では、連結部１７１、１７３およびブッシュ２１１、２１３を区別するために、回動軸方向Ｘにおいて上流側に位置する連結部１７１を「上流連結部」と称する一方、下流側に位置する連結部１７３を「下流連結部」と称し、またブッシュ２１１、２１３をそれぞれ「上流ブッシュ」および「下流ブッシュ」と称する。   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.

また、アーム１６の先端部は本発明の「中央連結部」の一例に相当するものであり、中央連結部１６１にテーパ孔が、上流連結部１７１および下流連結部１７３と同様に、形成されるとともに、当該テーパ孔に対して円錐台形状のブッシュ２１２が回動軸方向Ｘの上流側から嵌入されている。   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.

このように本実施形態では、３つのブッシュ２１１〜２１３が回動軸方向Ｘに沿って当該順序で配列されている。ブッシュ２１１〜２１３には、テーパ状のテーパ孔２２１〜２２３がそれぞれ穿設されている。つまり、各ブッシュ２１１〜２１３では、回動軸方向Ｘの上流側（図２中の左手側）の開口の内径が下流側（図２中の右手側）の開口の内径よりも広くなるように形成されている。そして、図３に示すように、それらの内径ｄ３〜ｄ８は次の寸法関係、つまり
ｄ３＞ｄ４≒ｄ５＞ｄ６≒ｄ７＞ｄ８
ただし、
ｄ３：ブッシュ２１１の上流側開口の内径、
ｄ４：ブッシュ２１１の下流側開口の内径、
ｄ５：ブッシュ２１２の上流側開口の内径、
ｄ６：ブッシュ２１２の下流側開口の内径、
ｄ７：ブッシュ２１３の上流側開口の内径、
ｄ８：ブッシュ２１３の下流側開口の内径、
を有している。このため、上流連結部１７１および下流連結部１７３の間に中央連結部１６１が介挿された状態（本発明の「連結準備状態」に相当）では、図２に示すように、テーパ孔２２１〜２２３が回動軸方向Ｘに沿って一列に配列されてテーパ孔２２が形成される。つまり、テーパ孔２２では、回動軸方向Ｘの上流側（図２中の左手側）の開口の内径ｄ３が下流側（図２中の右手側）の開口の内径ｄ８よりも広く、回動軸方向Ｘに向かって孔径が徐々に小さくなっている。そして、テーパ孔２２は、次に説明する連結ピン２３を挿通するための「ピン挿通孔」として機能する。 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.

連結ピン２３は回動軸方向Ｘに延設された金属製の棒状部材であり、先細り形状を有している。回動軸方向Ｘにおける連結ピン２３の外径は、上流端部２３１でブッシュ２１１の上流側開口よりも大きく（外径ｄ１＞内径ｄ３）、ピン挿通孔２２での内径変化率とほぼ同程度の割合で回動軸方向Ｘに向かって連続的に小さくなっていき、下流端部２３３でブッシュ２１３の下流側開口と同程度あるいは若干小さくなっている（外径ｄ２≒内径ｄ８、あるいは外径ｄ２＜内径ｄ８）。このため、連結ピン２３の下流端部２３３がピン挿通孔２２の中心軸と完全に一致していない場合であっても、ピン挿通孔２２に対して連結ピン２３を回動軸方向Ｘに容易に挿入することができる。そして、こうして挿入された連結ピン２３の中央部２３２がピン挿通孔２２でブッシュ２１１〜２１３と摺動自在に嵌合され、アーム１６とバケット１７とを回動軸ＡＸまわりに回動自在に軸支する。なお、連結ピン２３の中央部２３２がブッシュ２１１〜２１３と嵌合した時点で連結ピン２３がさらに回動軸方向Ｘに移動することはない。また、アーム１６とバケット１７とを連結している間に連結ピン２３が回動軸方向Ｘの上流側に抜けるのを防止するために、抜止機構２４が設けられている。   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.

抜止機構２４は、連結ピン２３の下流端部２３３に取り付けられたネジ部２４１と、ワッシャー２４２と、ネジ部２４１に螺合可能なナット２４３とを有している。このため、ワッシャー２４２をブッシュ２１１に係合させるようにナット２４３を締め付けることで連結ピン２３の抜けを防止することができる。   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.

本実施形態では、連結ピン２３の中央部２３２がブッシュ２１１〜２１３と摺動自在に設けられているが、回動動作に伴う連結ピン２３およびブッシュ２１１〜２１３の摩耗を制御するために、３つのボルト２５１〜２５３が設けられている。すなわち、上流連結部１７１に対して本発明の「上流固定部材」として機能するボルト２５１が取り付けられている。このボルト２５１を操作することで、ピン挿通孔２２に嵌合された連結ピン２３に対し、上流ブッシュ２１１および上流連結部１７１を固定可能となっている。また、中央連結部１６１に対して本発明の「中央固定部材」として機能するボルト２５２が取り付けられており、ボルト２５２の操作によってピン挿通孔２２に嵌合された連結ピン２３に対し、中央ブッシュ２１２および中央連結部１６１を固定可能となっている。さらに、下流連結部１７３に対して本発明の「下流固定部材」として機能するボルト２５３が取り付けられており、ボルト２５３の操作によってピン挿通孔２２に嵌合された連結ピン２３に対し、下流ブッシュ２１１および下流連結部１７３を固定可能となっている。このため、図２に示すように、ボルト２５２による固定を解除する一方、ボルト２５１、２５３によりピン挿通孔２２に嵌合された連結ピン２３に対し、上流ブッシュ２１１、上流連結部１７１、下流ブッシュ２１３および下流連結部１７３を固定することで、アーム１６に対してバケット１７が相対的に回動する際に連結ピン２３が中央ブッシュ２１２にのみ摺動して上流ブッシュ２１１と下流ブッシュ２１３との摩耗を防止することができる（第１回動モード）。逆に、図４に示すように、ボルト固定態様を逆転させると、アーム１６に対してバケット１７が相対的に回動する際に連結ピン２３が上流ブッシュ２１１および下流ブッシュ２１３にのみ摺動して中央ブッシュ２１２との摩耗を防止することができる（第２回動モード）。したがって、ブッシュ２１１〜２１３および連結ピン２３の摩耗状況に応じて第１回動モードおよび第２回動モードを選択的に切り替えることで摩耗状況の均一化を図ることができ、ブッシュ２１１〜２１３や連結ピン２３の交換寿命を延ばすことができる。   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.

ブッシュ２１１〜２１３や連結ピン２３の摩耗が進行していくと、連結ピン２３の中央部２３２とブッシュ２１１〜２１３との間にクリアランスが生じ、これが連結部分でのカタツキや油圧ショベル１０の振動などの要因となることがある。しかしながら、本実施形態では、先細り形状の連結ピン２３を用いているため、図５に示すように、摩耗状況に応じて連結ピン２３を回動軸方向Ｘに移動させ、再び連結ピン２３の中央部２３２をブッシュ２１１〜２１３に嵌合させてクリアランスを解消すればよい。この場合、連結ピン２３の移動量に対応してワッシャー２４２を追加すればよい。   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.

なお、図２ないし図５では、連結ピン２３の上流端部２３１にネジ孔２６が設けられているが、これは次に説明する取外装置により連結ピン２３を取り外す際に利用するものである。   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. .

図６および図７は本発明に係る連結ピンの取外装置の一実施形態を示す図であり、図６は連結装置への取外装置の装着手順を示す一方、図７は取外装置による連結ピンの取外手順を示している。本実施形態では、ブッシュ２１１〜２１３に嵌合された連結ピン２３を回動軸方向Ｘの上流側（これらの図面中の左手側）に取り外すために、取外装置３０が連結ピン２３に対して着脱自在に設けられている。この取外装置３０は、ネジ部材３１、係合部材３２およびナット３３を有している。ネジ部材３１は、回動軸方向Ｘにおける連結ピン２３の上流端部２３１に設けられたネジ孔２６に対してネジ部材３１の回動軸方向Ｘの下流端部が着脱自在に構成されている。油圧ショベル１０により通常作業を行う際にはネジ部材３１はネジ孔２６から取り外される。   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.

一方、連結ピン２３の取外作業を行う際にはネジ部材３１の回動軸方向Ｘの下流端部がネジ孔２６に螺入されて連結ピン２３と一体化される。なお、連結ピン２３からのネジ部材３１の抜けを確実に防止するために、抜止ナット３４が設けられている。こうして一体化されたネジ部材３１に対して係合部材３２が取り付けられている。   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.

係合部材３２は、平板状の中央部３２１と、中央部３２１から上流連結部１７１に向かって延設された延設部３２２とを有している。中央部３２１には貫通孔が設けられ、ネジ部材３１に対して中央部３２１を挿通させながら係合部材３２をネジ部材３１の上流端部から連結ピン２３に向かって装着可能となっている。係合部材３２の装着によって延設部３２２の先端が上流連結部１７１に係合可能となっている。この実施形態では、２本の延設部３２２が中央部３２１からネジ部材３１の軸方向に対して対称に延設されているが、延設部３２２の形状や本数はこれに限定されるものではなく、延設部３２２がカップ形状に仕上げられたり、３本以上の延設部３２２がネジ部材３１の軸方向を対称軸として等角度間隔で放射状に設けられていてもよい。   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.

係合部材３２の中央部３２１に対して回動軸方向Ｘの上流側ではナット３３が本発明の「螺合部材」としてネジ部材３１に螺合されている。図６中の矢印ＡＲ１、ＡＲ２に示すようにボルト２５１、２５３による連結ピン２３とブッシュ２１１、２１３との固定を解除し、しかも矢印ＡＲ３に示すようにナット２４３をネジ部２４１から取り外しておき、その状態で矢印ＡＲ４に示すようにナット３３をネジ部材３１に沿って回動軸方向Ｘの下流側に螺進することで連結ピン２３の取外が行われる。つまり、ナット３３の螺進に伴って延設部３２２の先端が上流連結部１７１を回動軸方向Ｘに押圧する。このとき、図７に示すように、反力によって連結ピン２３、ネジ部材３１、係合部材３２および抜止ナット３４が一体的にアーム１６およびバケット１７に対して回動軸方向Ｘの上流側に相対移動して連結ピン２３の取外が行われる。   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.

このときの取外量は連結ピン２３の軸方向長さよりも短いため、そのまま作業員のみによる取り外し作業を行うことは難しいため、取外装置３０を装着したまま作業機械により連結ピン２３を引き抜き、連結ピン２３の完全な引き抜きが完了した後で、連結ピン２３から取外装置３０を取り外す。ここで、連結ピン２３からの取外装置３０の取外タイミングはこれに限定されるものではなく、例えば取外装置３０を取り外した後でネジ孔２６にフックなどの連結部を装着し、特許文献１に記載の方法で取り外してもよい。このように取外装置３０を用いることで連結ピン２３を簡易に取り外すことができる。   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.

上記した実施形態では、バケット１７およびアーム１６がそれぞれ本発明の「第１部品」および「第２部品」の一例に相当している。また、上流連結部１７１に設けられたテーパ孔、中央連結部１６１に設けられたテーパ孔および下流連結部１７３に設けられたテーパ孔がそれぞれ本発明の「上流孔」、「中央孔」および「下流孔」の一例に相当している。   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”.

なお、本発明は上記した実施形態に限定されるものではなく、その趣旨を逸脱しない限りにおいて上述したもの以外に種々の変更を行うことが可能である。例えば上記実施形態では、第１回動モードおよび第２回動モードを選択的に切り替え可能となっているが、例えば図８に示すようにボルト２５１〜２５３による連結ピン２３の固定をすべて解除して
連結ピン２３が全ブッシュ２１１〜２１３に摺動しながらアーム１６に対してバケット１７が相対的に回動させる第３回動モードを適宜実施してもよい。 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.

また、上記実施形態では、バケット１７およびアーム１６の連結に連結装置２０を用いているが、連結装置２０の適用場所はこれに限定されるものではなく、バケット１７の代わりに油圧ブレーカ、大割機、鉄骨切断機などの他のアタッチメントを連結する場合、あるいは油圧ショベル１０における他の部品、例えばアームとブームとの連結に本発明に係る連結装置を適用しても同様の作用効果が得られる。   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. .

また、上記実施形態では、連結ピン２３の取外を取外装置３０により行っているが、特許文献１に記載された取外方法を用いてもよい。   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.

この発明は、建設機械を構成する第１部品と第２部品とを回動軸まわりに回動自在に連結する連結装置、当該連結装置を用いた建設機械および連結ピンを取り外す連結ピンの取外装置全般に適用することができる。   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…油圧ショベル（建設機械）
１６…アーム（第２部品）
１７…バケット（第１部品）
２０…連結装置
２２１…テーパ孔（上流孔）
２２２…テーパ孔（中央孔）
２２３…テーパ孔（下流孔）
２２…ピン挿通孔
２３…連結ピン
２６…ネジ孔
３０…取外装置
３１…ネジ部材
３２…係合部材
３３…ナット（螺合部材）
１６１…中央連結部
１７１…上流連結部
１７３…下流連結部
２１１…上流ブッシュ
２１２…中央ブッシュ
２１３…下流ブッシュ
２３１…（連結ピンの）上流端部
２３２…（連結ピンの）中央部
２３３…（連結ピンの）下流端部
３２１…（係合部材の）中央部
３２２…（係合部材の）延設部
ＡＸ…回動軸
Ｘ…回動軸方向 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)

建設機械を構成する第１部品と第２部品とを回動軸まわりに回動自在に連結する連結装置であって、
前記第１部品に設けられた上流連結部と前記上流連結部から回動軸方向の下流側に離間して前記第１部品に設けられた下流連結部との間に前記第２部品の中央連結部を介挿させた連結準備状態で、前記上流連結部に形成された上流孔、前記中央連結部に形成された中央孔および前記下流連結部に形成された下流孔に対して前記回動軸方向に挿通されて前記第１部品および前記第２部品を前記回動軸まわりに軸支する連結ピンと、
前記回動軸方向に向かって孔径が小さくなるテーパ孔を有し、前記上流孔に装着される上流ブッシュと、
前記回動軸方向に向かって孔径が小さくなるテーパ孔を有し、前記中央孔に装着される中央ブッシュと、
前記回動軸方向に向かって孔径が小さくなるテーパ孔を有し、前記下流孔に装着される下流ブッシュとを備え、
前記連結ピンの外径が前記回動軸方向に向かって連続的に小さくなっており、
前記連結準備状態で前記上流ブッシュ、前記中央ブッシュおよび前記下流ブッシュが前記回動軸方向に配列して前記連結ピンと嵌合可能なピン挿通孔が形成される
ことを特徴とする連結装置。 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. 請求項１に記載の連結装置であって、
前記ピン挿通孔に嵌合された前記連結ピンに対し、前記上流ブッシュおよび前記上流連結部を固定する上流固定部材と、
前記ピン挿通孔に嵌合された前記連結ピンに対し、前記下流ブッシュおよび前記下流連結部を固定する下流固定部材と、を備え、
前記第１部品が前記第２部品に対して相対的に回動する際に前記連結ピンを前記中央ブッシュにのみ摺動させる連結装置。 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. 請求項１に記載の連結装置であって、
前記ピン挿通孔に嵌合された前記連結ピンに対し、前記中央ブッシュおよび前記中央連結部を固定する中央固定部材を備え、
前記第１部品が前記第２部品に対して相対的に回動する際に前記連結ピンを前記上流ブッシュおよび前記下流ブッシュにのみ摺動させる連結装置。 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. 請求項１に記載の連結装置であって、
前記ピン挿通孔に嵌合された前記連結ピンに対し、前記上流ブッシュおよび前記上流連結部を固定可能な上流固定部材と、
前記ピン挿通孔に嵌合された前記連結ピンに対し、前記中央ブッシュおよび前記中央連結部を固定可能な中央固定部材と、
前記ピン挿通孔に嵌合された前記連結ピンに対し、前記下流ブッシュおよび前記下流連結部を固定可能な下流固定部材と、を備え、
前記上流固定部材および前記下流固定部材により、前記ピン挿通孔に嵌合された前記連結ピンに対し、前記上流ブッシュ、前記上流連結部、前記下流ブッシュおよび前記下流連結部を固定して前記第１部品が前記第２部品に対して相対的に回動する際に前記連結ピンを前記中央ブッシュにのみ摺動させる第１回動モードと、
前記中央固定部材により、前記ピン挿通孔に嵌合された前記連結ピンに対し、前記中央ブッシュおよび前記中央連結部を固定して前記第１部品が前記第２部品に対して相対的に回動する際に前記連結ピンを前記上流ブッシュおよび前記下流ブッシュにのみ摺動させる第２回動モードと
を選択的に実行可能となっている連結装置。 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. 請求項１ないし４のいずれか一項に記載の連結装置により、第１部品と第２部品とが回動軸まわりに回動自在に連結されていることを特徴とする建設機械。 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 . 建設機械を構成する第１部品と第２部品とを回動軸まわりに回動自在に連結する連結装置であって前記第１部品に設けられた上流連結部と前記上流連結部から回動軸方向の下流側に離間して前記第１部品に設けられた下流連結部との間に前記第２部品の中央連結部を介挿させた連結準備状態で、前記上流連結部に形成された上流孔、前記中央連結部に形成された中央孔および前記下流連結部に形成された下流孔に対して前記回動軸方向に挿通されて前記第１部品および前記第２部品を前記回動軸まわりに軸支する連結ピンを備え、 前記連結ピンの外径が前記回動軸方向に向かって連続的に小さくなっている、前記連結装置の前記連結ピンを前記回動軸方向の上流側に取り外す連結ピンの取外装置であって、
前記回動軸方向における前記連結ピンの上流端部に装着されるネジ部材と、
前記ネジ部材を挿通するための貫通孔が中央部に形成されるとともに前記中央部から前記上流連結部に向かって延設された延設部の先端が前記上流連結部と係合する係合部材と、
前記係合部材の中央部に対して前記回動軸方向の上流側で前記ネジ部材に螺合される螺合部材とを備え、
前記螺合部材が前記ネジ部材に沿って前記回動軸方向の下流側に螺進することで前記延設部の先端で前記上流連結部を前記回動軸方向に押圧しながら前記ネジ部材および前記連結ピンを前記第１部品および前記第２部品に対して前記回動軸方向の上流側に相対移動させることを特徴とする連結ピンの取外装置。 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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JP2000212986A (en) * 1999-01-20 2000-08-02 Okabe Tekkosho:Kk Boom construction for backhoe
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JP3194803U (en) * 2014-09-29 2014-12-11 株式会社北栄建設 Fixing pin and fixing pin attaching / detaching device
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JPH0340346U (en) * 1989-08-24 1991-04-18
JPH0369052U (en) * 1989-11-08 1991-07-09
JPH09511294A (en) * 1994-02-09 1997-11-11 ラウニスト アイリ Jerk coupling assembly
JP2000212986A (en) * 1999-01-20 2000-08-02 Okabe Tekkosho:Kk Boom construction for backhoe
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