JP6588378B2 - Work machine connection structure - Google Patents

Description

  The present invention relates to a connection structure for a work machine that rotatably connects a work device to a traveling body.

  As an example of such a working machine, there is a swing-type power shovel configured by attaching a shovel device for excavation work to a front part of a vehicle body so as to be rotatable (horizontal swivel) in a horizontal plane (for example, see Patent Document 1). reference). In this way, the connecting structure for rotatably connecting the shovel device is provided with the vehicle body side bracket projecting to the front portion of the vehicle body, and the shovel device side bracket projecting rearward at the base end portion of the shovel device. And the excavator device side bracket are connected by a connecting pin. In addition, a cylindrical bush member is provided between the bracket and the connecting pin, and the bush member fills a gap between the bracket and the connecting pin or performs buffering.

JP 2000-328599 A

  In such a connecting structure using connecting pins, grease (lubricant) is supplied between the connecting pin and the inner peripheral surface of the bush member in order to smoothly rotate the connecting pin. However, if grease is not supplied to the entire inner peripheral surface of the bush member, there is a problem in that friction is increased and seizure occurs in a portion where the bush member is not supplied. Therefore, even in the conventional bush member, in order to improve the grease supply state, there is a configuration in which one thick grease supply groove is provided on the outer peripheral surface of the bush member, but even with such a configuration, There is a problem in that the grease is not supplied to the entire inner peripheral surface of the bush member and seizure may occur.

  The present invention has been made in view of such a problem, and can supply grease to the entire inner peripheral surface of the bush member and prevent seizure from occurring on the inner peripheral surface of the connecting pin and the bush member. An object of the present invention is to provide a work machine connection structure that can be used.

In order to achieve the above object, the present invention includes a traveling body that can travel (for example, the traveling device 10 and the revolving body 20 in the embodiment) and a working device that is provided on the traveling body and performs a predetermined work (for example, implementation). In the working machine (for example, the power shovel 1 in the embodiment) including the excavator device 30) in the form, the working device is connected to the traveling body so as to be rotatable, and the traveling structure includes the traveling device. A connecting hole is formed in the traveling body side bracket (for example, the main body side bracket 50 in the embodiment) provided on the body, a cylindrical bush member is inserted into the connecting hole, and the connecting pin inserted into the bush member is inserted into the connecting hole. The work device is configured to be pivotally connected to the traveling body at the center. The bush member is formed in a first grease supply groove (for example, the first grease supply groove 81 in the embodiment) formed over the entire circumference of the bush member and in the first grease supply groove. A first grease supply hole (for example, the first grease supply hole 91 in the embodiment) connected to the inner peripheral surface of the bush member and an outer peripheral surface of the bush member are formed to extend obliquely upward from the first grease supply groove. The second grease supply groove (for example, the second grease supply groove 82 in the embodiment) and the second grease supply hole (for example, formed in the upper end portion of the second grease supply groove and connected to the inner peripheral surface of the bush member) The second grease supply hole 92) in the embodiment, and the grease injected into the first grease supply groove passes through the first grease supply hole. So as to be supplied from the first grease supply groove to the inner peripheral surface of the bush member through the second grease supply groove and the second grease supply hole. Consists of.

  In the work machine connection structure configured as described above, the bush member preferably includes a plurality of the first grease supply holes, a plurality of the second grease supply grooves, and a plurality of the second grease supply holes.

  In the work machine connection structure configured as described above, the second grease supply groove extends obliquely upward from the first grease supply groove, extends obliquely downward from an upper end portion thereof, and is connected to the first grease supply groove again. Preferably it is formed.

  According to the present invention, the bush member includes a first grease supply groove formed on the outer peripheral surface over the entire circumference, a first grease supply hole formed in the first grease supply groove, and a diagonally upward position from the first grease supply groove. And a second grease supply hole formed in an upper end portion of the second grease supply groove, and the grease injected into the first grease supply groove is the first grease. It is configured to be supplied to the inner peripheral surface of the bush member through the supply hole and to be supplied from the first grease supply groove to the inner peripheral surface of the bush member through the second grease supply groove and the second grease supply hole. Has been. Therefore, since the grease can be supplied to the inner peripheral surface of the bush member not only from the first grease supply hole but also from the second grease supply hole formed above the first grease supply hole, the bush member Grease can be supplied to the entire inner peripheral surface of the. Therefore, it is possible to prevent seizure from occurring on the inner peripheral surfaces of the connecting pin and the bush member.

  Further, if the bush member includes a plurality of first grease supply holes, a plurality of second grease supply grooves, and a plurality of second grease supply holes, more first and second grease supply holes. Therefore, the grease can be supplied to the entire inner peripheral surface of the bush member, so that the grease can be supplied more uniformly to the entire inner peripheral surface of the bush member.

  Further, if the second grease supply groove is formed so as to extend obliquely upward from the first grease supply groove, extend obliquely downward from the upper end portion thereof, and again connect to the first grease supply groove, the first grease is provided. Since the grease injected into the supply groove can be guided to the second grease supply hole from two directions, the grease can be stably supplied from the second grease supply hole to the inner peripheral surface of the bush member.

It is a perspective view of the power shovel which is an example of the working machine which concerns on this invention. It is a side view which shows the connection structure of the working machine which concerns on this invention. It is a top view which shows the connection structure of the working machine which concerns on this invention. FIG. 4 is a cross-sectional view showing an arrow IV-IV portion in FIG. 3. It is a perspective view of the bush member which comprises the connection structure of the working machine which concerns on this invention. It is the top view and side view of the said bush member. It is an expanded view which shows the structure of the internal peripheral surface of the said bush member. It is sectional drawing which shows the arrow VIII-VIII part in FIG. It is a perspective view which shows the grease gun mounted in the said power shovel. It is a perspective view which shows the said grease gun and a grease gun support mechanism. It is a side view showing an operation when a grease gun is fixedly supported by the grease gun support mechanism.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. A power shovel 1 which is an example of a work machine according to the present invention is shown in FIG. The power shovel 1 includes a traveling device 10 configured to be able to travel, a revolving body 20 provided on the upper portion of the traveling device 10 so as to be horizontally turnable, and a shovel device 30 provided at a front portion of the revolving body 20. Configured.

  The traveling device 10 is configured by providing a crawler mechanism 15 having a driving wheel 11, a driven wheel 12, and a crawler belt 13 wound around both wheels on the left and right sides of the vehicle body frame 16. The left and right crawler mechanisms 15, 15 are provided with left and right traveling motors (not shown) that rotationally drive the left and right drive wheels 11, 11, and control the rotation direction and rotational speed of the left and right traveling motors. Thus, the vehicle can travel in any direction and speed. A blade 18 is provided at the rear portion of the vehicle body frame 16 so as to be swingable up and down. The blade 18 is configured to be able to swing up and down by extending and contracting a blade cylinder (not shown) straddled between the body frame 16 and the blade 18.

  A main body frame 21 of the revolving structure 20 is attached to the center upper portion of the vehicle body frame 16 via a turning drive mechanism (not shown) so as to be horizontally turnable. The main body frame 21 is configured to be turnable to the left and right with respect to the traveling device 10 by driving the turning motor in the turning drive mechanism forward or backward. A main body side bracket 50 protruding forward is provided at the front portion of the main body frame 21.

  The shovel device 30 has a boom bracket 60 attached to the main body side bracket 50 so as to be pivotable (horizontal swivel) about the vertical axis A, and can swing up and down (raising and lowering) on the boom bracket 60 by a first swing pin 35a. A first boom 31 attached to the front end of the first boom 31, a second boom 32 attached to the front end of the first boom 31 by a second swing pin 35b, and a second boom 32 attached to the front end of the second boom 32. It has an arm 33 that is swingable up and down (flexible and flexible) by three swing pins 35c, and a bucket 34 that is swingably mounted by a fourth swing pin 35d at the tip of the arm 33. It is configured.

  The boom bracket 60 is configured to be rotatable (swingable) in a horizontal plane by operating a swing cylinder (not shown) extending between the main body frame 21 and the boom bracket 60 to extend and contract. The first boom 31 is configured to be movable up and down in the upper and lower surfaces by operating the first boom cylinder 36 extending between the boom bracket 60 and the first boom 31 to extend and contract. The second boom 32 is configured to be swingable in the upper and lower surfaces by operating a second boom cylinder 37 extending between the first boom 31 and the second boom 32 to extend and contract. The arm 33 is configured to be able to bend and extend with respect to the second boom 32 by extending and contracting an arm cylinder 38 extending between the second boom 32 and the arm 33. The bucket 34 is configured to be swingable with respect to the arm 33 via the link mechanism 41 by extending and retracting a bucket cylinder 39 straddling between the arm 33 and the bucket 34.

On the main body frame 21 of the revolving structure 20, an operator cabin 25 on which an operator gets on is provided. Inside the operator cabin 25, an operator seat 26 on which an operator sits, a pair of left and right traveling operation levers 27L and 27R for operating the traveling device 10, and a left and right for operating the revolving unit 20 and the shovel device 30 are operated. Work control levers 28L and 28R are provided. When the travel operation levers 27L and 27R and the work operation levers 28L and 28R are respectively operated, electrical signals corresponding to the operation direction (tilt direction) and the operation amount (tilt amount) from the reference position are output, and the operation operation signals are respectively output. As input to the work controller.

  In the vehicle body cover 29 behind the operator cabin 25, the left and right travel motors and blade cylinders in the travel device 10, the swing motor in the swing body 20, and the swing cylinder in the excavator device 30, the first boom cylinder 36, the second boom cylinder 37, a hydraulic drive device is provided for supplying hydraulic oil to the arm cylinder 38 and bucket cylinder 39 (hereinafter collectively referred to as a hydraulic actuator) for driving. The hydraulic drive device includes a diesel engine, a hydraulic pump driven by the engine, and a control valve that controls the direction and flow rate of hydraulic oil supplied to the hydraulic actuator. Then, the control valve is operated and controlled by an operation control signal output from the work controller in accordance with the operation state of the travel operation levers 27L and 27R and the work operation levers 28L and 28R. Is controlled, and the hydraulic actuator is driven.

  Next, the structure in which the boom bracket 60 of the excavator device 30 is rotatably connected to the main body side bracket 50 of the revolving unit 20 in a horizontal plane will be described in detail.

  As shown in FIGS. 2 to 4, the main body side bracket 50 includes a pair of upper and lower plate members 51, 52 that are integrally connected to the main body frame 21 of the revolving unit 20 and extend forward, and tip portions of these plate members 51, 52. And a pair of upper and lower connecting bosses 53 and 54, and a reinforcing member 55 fixedly connecting the upper and lower plate members 51 and 52. The boom bracket 60 includes a base member 61 having a boom pivoting boss 62 that pivots the first boom 31 and a boom cylinder pivoting boss 63 that pivots the first boom cylinder 36 by inserting the first swing pin 35a. And upper connection arms 64, 65 that are integrally connected to the base member 61 and extend rearward and face each other with a predetermined interval therebetween, and are disposed below the upper connection arms 64, 65 and the base member The lower connection arms 66 and 67 are integrally connected to 61 and extend backward to be opposed to each other with a predetermined distance therebetween. A swing cylinder pivot boss 68 that pivots the swing cylinder is provided on the right side of the base member 61.

  In the upper and lower connection bosses 53 and 54 of the main body side bracket 50, connection holes 53a and 54a extending in the vertical direction are formed coaxially. The upper connection arms 64 and 65 and the lower connection arms 66 and 67 of the boom bracket 60 are also formed with connection holes 64a, 65a, 66a, and 67a extending in the vertical direction so as to be coaxial. The upper and lower connection bosses 53 and 54 can be inserted between the upper connection arms 64 and 65 and between the lower connection arms 66 and 67, respectively. The upper and lower connection bosses 53 and 54 are inserted between the upper and lower connection arms 64 to 67, and the connection holes 53a and 54a of the connection bosses 53 and 54 and the connection holes 64a to 67a of the connection arms 64 to 67 are coaxial. In the disposed state, as shown in FIG. 4, the connection pins 71 and 71 are inserted into the respective connection holes, whereby the boom bracket 60 is rotatable in a horizontal plane with respect to the main body side bracket 50 (horizontal rotation is possible). ).

Thus, the upper connection boss 53 is inserted between the upper connection arms 64 and 65, and the connection pin 71 is inserted into the connection holes 64a, 65a and 53a. At this time, a cylindrical bush member 80 (bearing member) is inserted (press-fitted) into the connection hole 53 a of the upper connection boss 53, and the connection pin 71 is attached through the bush member 80. A similar bush member 80 is also inserted into the connection hole 54 a of the lower connection boss 54, and the connection pin 71 is attached through the bush member 80. Grease injection holes 53b and 54b connected to the connection holes 53a and 54a are formed on the side surfaces of the upper and lower connection bosses 53 and 54, and grease nipples (not shown) are attached to the grease injection holes 53b and 54b, respectively. ing. A nozzle of a grease gun 100, which will be described later, can be attached to the grease nipple, and grease can be injected from the attached grease gun 100 to the outer peripheral surface of the bush member 80 through the grease injection holes 53b and 54b. It can be done.

  As shown in FIGS. 5 and 6, the bush member 80 is formed in a cylindrical shape using a metal material or the like. A first grease supply groove 81 is formed on the outer peripheral surface of the bush member 80 over the circumference in the circumferential direction. The first grease supply groove 81 is connected to and aligned with the grease injection holes 53b and 54b of the connection bosses 53 and 54 when the bush member 80 is inserted into the connection holes 53a and 54a of the connection bosses 53 and 54. Is formed. Two first grease supply holes 91 connected to the inner peripheral surface of the bush member 80 are formed in the first grease supply groove 81 at positions facing each other.

  Further, on the outer peripheral surface of the bush member 80, a mountain-shaped second grease supply groove 82 that extends obliquely upward from the first grease supply groove 81, extends obliquely downward from the upper end portion thereof, and is connected to the first grease supply groove 81 again. Is formed. Two second grease supply grooves 82 are formed on the outer peripheral surface of the bush member 80, and the lower ends of the two second grease supply grooves 82 are connected to each other, and both lower ends thereof are connected to the first grease supply groove 81. It is formed to be connected. A second grease supply hole 92 connected to the inner peripheral surface of the bush member 80 is formed in the upper end portion (vertex portion) of each of the second grease supply grooves 82 and 82. The second grease supply holes 92, 92 are formed at positions shifted by about 45 degrees in plan view with respect to the first grease supply holes 91, 91, and are arranged so that the two second grease supply holes 92 face each other. ing. The second grease supply grooves 82 and 82 are grooves having a width dimension smaller than the width dimension of the first grease supply groove 81.

  As shown in FIGS. 7 and 8, a third grease supply groove 83 is formed on the inner peripheral surface of the bush member 80 over the entire circumference so as to connect the two first grease supply holes 91. A supply groove 84 is formed over the circumference in the circumferential direction so as to connect the two second grease supply holes 92. In addition, a substantially 8-shaped fifth grease supply groove 85 is formed on the inner peripheral surface of the bush member 80 so as to connect all of the two first grease supply holes 91 and the two second grease supply holes 92. An eight-shaped sixth grease supply groove 86 is formed so as to be offset from the fifth grease supply groove 85 by about 90 degrees in plan view and to connect the two second grease supply holes 92. The upper end portions of the fifth and sixth grease supply grooves 85 and 86 are opened upward from the upper end portion of the bush member 80. Further, the seventh and eighth grease supply grooves 87 and 88 are connected to the fifth and sixth grease supply grooves 85 and 86 on the inner peripheral surface of the bush member 80 at a position below the third grease supply groove 83, respectively. It is formed over the circumference in the circumferential direction. The seventh and eighth grease supply grooves 87 and 88 are grooves having a width dimension smaller than the width dimension of the third to sixth grease supply grooves 83 to 86.

  In the bush member 80 configured as described above, when grease is injected from the grease injection holes 53b and 54b by the grease gun, the grease is supplied into the first grease supply groove 81 on the outer peripheral surface of the bush member 80, Further, it is supplied from the first grease supply groove 81 to the two second grease supply grooves 82. Then, the grease is supplied to the inner peripheral surface of the bush member 80 through the first grease supply holes 91 and 91 in the first grease supply groove 81, and the second grease supply in the second grease supply grooves 82 and 82 is provided. Grease is supplied to the inner peripheral surface of the bush member 80 through the holes 92 and 92. Then, on the inner peripheral surface of the bush member 80, the grease supplied from the first grease supply holes 91, 91 and the second grease supply holes 92, 92 is supplied to the third to eighth grease supply grooves 83 to 88, and the bush Grease is supplied over the entire inner peripheral surface of the member 80.

Thus, according to the bush member 80, the second grease supply formed not only from the first grease supply holes 91, 91 in the first grease supply groove 81 but also above the first grease supply holes 91, 91. Since the grease can be supplied also to the inner peripheral surface of the bush member 80 from the holes 92, 92, the grease can be supplied to the entire inner peripheral surface of the bush member 80. Accordingly, seizure can be prevented from occurring on the inner peripheral surfaces of the connecting pin 71 and the bush member 80. Further, since the two first grease supply holes 91 and the two second grease supply holes 92 are formed, the grease can be supplied to the inner peripheral surface of the bush member 80 from more grease supply holes. Therefore, the grease can be supplied more uniformly to the entire inner peripheral surface of the bush member 80.

  Further, the second grease supply groove 82 is formed so as to extend obliquely upward from the first grease supply groove 81, extend obliquely downward from the upper end portion thereof, and is connected to the first grease supply groove 81 again. The grease injected into the grease supply groove 81 can be guided to the second grease supply hole 92 from two directions. Therefore, the grease can be stably supplied from the second grease supply hole 92 to the inner peripheral surface of the bush member 80.

  As shown in FIG. 9, in the excavator 1, a grease gun 100 for supplying grease to the bush member 80 and other movable parts is disposed inside the opening / closing cover 23 provided in the revolving body 20 so as to be openable and closable. It is mounted via the support mechanism 110. As shown in FIG. 10, the grease gun 100 is provided along a cylindrical grease gun main body 101 (oil cylinder), a nozzle 102 provided at the tip of the grease gun main body 101, and an outer peripheral surface of the grease gun main body 101. And an operation lever 103 provided to extend. The grease gun 100 is configured to discharge the grease in the cartridge provided in the grease gun main body 101 from the nozzle 102 when the operation lever 103 is manually operated.

  The grease gun support mechanism 110 includes a support bracket 111 fixed to the revolving body 20 with bolts, a nozzle receiving member 112 provided at an end of the support bracket 111, and a lock provided swingably on the support bracket 111. And an arm 115. The support bracket 111 includes a flat plate-like base portion 111a fixed to the revolving unit 20 with bolts and the like, and flat plate-like support wall portions 111b and 111b extending upward from both ends of the base portion 111a. The Semicircular arc-shaped support portions 111c and 111c corresponding to the outer shape of the grease gun body 101 are formed at the upper ends of the support wall portions 111b and 111b, respectively. The support bracket 111 is configured to support the grease gun 100 in a state where the grease gun body 101 is placed in the support portions 111c and 111c. The nozzle receiving member 112 is formed in a semi-cylindrical shape that covers the side and lower side of the nozzle 102 of the grease gun 100 supported by the support bracket 111.

  As shown in FIGS. 10 and 11, the lock arm 115 is formed by bending a thin metal plate material, and has a semicircular arc-shaped base end arm portion 115a and an intermediate portion extending straight from the front end portion of the base end arm portion 115a. The arm portion 115b and a distal end lock portion 115c formed by folding back the distal end portion of the intermediate arm portion 115b are configured. The base end portion of the base end arm portion 115a is pivoted to the upper surface of the base portion 111a of the support bracket 111 by a pivot shaft B in a direction orthogonal to the paper surface of FIG. Swings around the center. The pivot shaft B extends in parallel with the central axis C of the grease gun 100 (grease gun main body 101) supported by the support bracket 111, and is disposed at a position directly below the central axis C. Since the lock arm 115 is formed by bending a thin metal plate material as described above, the base arm 115a having a semicircular arc shape can be bent so as to be slightly expanded or contracted. Yes (has flexibility) The tip lock portion 115 c is engaged so as to cover the operation lever 103 of the grease gun 100 supported by the support bracket 111.

  In the grease gun support mechanism 110 configured as described above, the grease gun 100 (grease gun body 101) is placed in the support portions 111c and 111c of the support bracket 111 as shown in FIG. The lever 103 is placed so as to be close to the inner surface of the tip lock portion 115 c of the lock arm 115. Then, the lock arm 115 is swung around the pivot axis B in a direction (a counterclockwise direction in FIG. 11) in which the tip lock portion 115c approaches the orthogonal line D through the pivot axis B and the central axis C. At the same time, the grease gun 100 together with the lock arm 115 is rotated around the central axis C while being placed in the support portions 111 c and 111 c of the support bracket 111.

  When the operation lever 103 of the grease gun 100 and the tip lock portion 115c of the lock arm 115 are rotated (swinged) to the vicinity of the position overlapping the line D in side view, the operation lever 103 is placed on the inner surface of the tip lock portion 115c. Comes into contact with each other and the distal end lock portion 115c is pushed up, and the semicircular arc shaped proximal end arm portion 115a of the lock arm 115 is slightly expanded. When the lock arm 115 and the grease gun 100 are further swung (rotated), the inner surfaces of the distal end lock portion 115c and the intermediate arm portion 115b abut against the side surface of the operation lever 103, and the inner surface of the proximal end arm portion 115a is grease. The gun body 101 is in contact with the outer peripheral surface. At this time, since the base end arm portion 115a is in a state of being expanded as described above, a biasing force (spring force) for pressing the grease gun 100 against the support bracket 111 is generated by the lock arm 115, and the grease gun is generated by this biasing force. 100 is fixed in a state where it is placed on the support bracket 111. On the other hand, when removing the grease gun 100 from the grease gun support mechanism 110, the grease gun 100 and the lock arm 115 are rotated (oscillated) in the opposite direction to release the fixed state of the grease gun 100 by the lock arm 115. The grease gun 100 can be removed.

  As described above, according to the grease gun support mechanism 110, when the lock arm 115 is swung and the grease gun 100 is rotated while being placed on the support bracket 111, the operation lever 103 of the grease gun 100 is moved to the lock arm 115. The distal end lock portion 115c is pushed up by being abutted against the distal end lock portion 115c and the semicircular arc shaped proximal end arm portion 115a is expanded, thereby generating a biasing force for pressing the grease gun 100 against the support bracket 111 by the lock arm 115. The grease gun 100 is configured to be fixed in a state where it is placed on the support bracket 111 by this urging force. Therefore, the grease gun 100 can be firmly fixed by the lock arm 115, and the grease gun 100 can be prevented from being detached from the support bracket 111 due to vibration during the operation of the power shovel 1. In addition, since the grease gun 100 can be fixed to or removed from the support bracket 111 by swinging (rotating) the lock arm 115 and the grease gun 100, the grease gun 100 can be easily attached and detached. .

  The embodiments of the present invention have been described so far, but the scope of the present invention is not limited to the above-described embodiments. For example, in the above-described embodiment, the second grease supply groove 82 is formed in a mountain shape that extends obliquely upward from the first grease supply groove 81, extends obliquely downward from the upper end portion thereof, and is connected to the first grease supply groove 81 again. However, a dead end may be formed at the upper end where the second grease supply hole 92 is formed. In the above-described embodiment, the two second grease supply grooves 82 and the two second grease supply holes 92 are formed, but one or three or more second grease supply grooves 82 and the second grease supply are formed. A configuration in which the hole 92 is formed may be employed. Furthermore, the 1st grease supply hole 91 is good also as a structure formed in 1 or 3 or more. However, when three or more second grease supply holes 92 are formed, it is necessary to change the shape of the grease supply groove formed on the inner peripheral surface of the bush member 80.

  In the above-described embodiment, the case where the present invention is applied to a crawler traveling excavator has been described. However, the present invention may be applied to a wheel traveling excavator, a work machine other than a power excavator, such as a hydraulic crane. The present invention can also be applied to a work machine.

1 Excavator (work machine)
10 Traveling device (traveling body)
20 Revolving body (running body)
30 Excavator device (working device)
50 Body side bracket (traveling body side bracket)
71 Connecting pin 80 Bushing member 81 First grease supply groove 82 Second grease supply groove 91 First grease supply hole 92 Second grease supply hole

Claims (3)

In a working machine comprising a traveling body capable of traveling and a working device that is provided on the traveling body and performs a predetermined work, the working machine is configured to connect the working device to the traveling body in a rotatable manner. There,
A connecting hole is formed in the traveling body side bracket provided in the traveling body, a cylindrical bush member is inserted into the connecting hole, and the working device is configured to center the connecting pin inserted into the bush member. Configured to be pivotally connected to the
The bush member includes a first grease supply groove formed over the outer peripheral surface of the bush member, and a first grease supply hole formed in the first grease supply groove and connected to the inner peripheral surface of the bush member. A second grease supply groove formed on the outer peripheral surface of the bush member so as to extend obliquely upward from the first grease supply groove; and an inner peripheral surface of the bush member formed in an upper end portion of the second grease supply groove. A second grease supply hole connected to
The grease injected into the first grease supply groove is supplied to the inner peripheral surface of the bush member through the first grease supply hole, and from the first grease supply groove to the second grease supply groove and A construction structure for a working machine, wherein the structure is configured to be supplied to an inner peripheral surface of the bush member through the second grease supply hole.   2. The work machine according to claim 1, wherein the bush member includes a plurality of the first grease supply holes, a plurality of the second grease supply grooves, and a plurality of the second grease supply holes. Connected structure.   The second grease supply groove is formed to extend obliquely upward from the first grease supply groove, to extend obliquely downward from an upper end portion thereof, and to be connected to the first grease supply groove again. The connection structure of the working machine as described in 1 or 2.

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