JP4759690B2 - Swivel work vehicle - Google Patents

Description

  The present invention relates to a structure of a cylinder cover of a turning work vehicle.

Conventionally, in a turning work vehicle equipped with an excavating work machine such as a backhoe, a boom, an arm, a work attachment, and the like constituting the work machine are driven by a hydraulic actuator such as a hydraulic cylinder. Pressure oil is supplied to the hydraulic actuator through a hydraulic hose from a hydraulic pump disposed in the swing body. A cylinder cover for covering and protecting the front of the boom cylinder is attached to the boom cylinder.
Japanese Utility Model Publication No. 62-035071

  However, as described above, the cylinder cover for protecting the boom cylinder has a flat front surface and is attached to the work attachment when the work attachment such as a bucket is wound. In some cases, foreign matter is caught between the work attachment and the cylinder cover, deforming the cylinder cover, and further damaging the boom cylinder.

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.
In claim 1, a boom (6) attached to a revolving structure (2) configured to be turnable via a boom bracket (12) so as to be turnable in the front-rear direction with respect to the operation unit (15) ; An arm (5) rotatably attached to the boom (6), and a work attachment (4) rotatably attached to the arm (5), the boom bracket (12); In a turning work vehicle in which a boom cylinder (11) interposed between the boom (6) and a boom cylinder (11) is disposed in front of the boom (6), a cylinder cover (26) covering the front of the boom cylinder (11) is provided. The cylinder cover (26) includes an outer cover (41) and an inner cover (42). The inner cover (42) is fixed to the outer cover (41), and both end portions of the inner cover (42) are attached to the inner cover (42). Bend inward to fit the fitting The slide piece is fixed to both the left and right positions of the boom cylinder (11) with a fixture, and the fitting portion of the inner cover (42) is slidably fitted into the groove provided on the slide piece, The front surface (41a) of the outer cover (41) constituting the cylinder cover (26) is formed in a mountain shape in which the center portion projects forward from the left and right end portions in plan view, and the outer cover (41) Both ends are bent rearward to form side surfaces (41b) .

Since the present invention is configured as described above, the following effects can be obtained.
That is, the boom (6) attached to the revolving structure (2) configured to be turnable as described in claim 1 via the boom bracket (12) so as to be turnable in the front-rear direction with respect to the driving operation unit (15). And an arm (5) rotatably attached to the boom (6), and a work attachment (4) rotatably attached to the arm (5), the boom bracket (12 ) And a boom (6), a cylinder cover (26) covering the front of the boom cylinder (11) in a turning work vehicle in which the boom cylinder (11) is disposed in front of the boom (6). The cylinder cover (26) is composed of an outer cover (41) and an inner cover (42). The inner cover (42) is fixed to the outer cover (41), and both ends of the inner cover (42) Bent part inward and mating part Forming and fixing a slide piece to the left and right side positions of the boom cylinder (11) with a fixture, and fitting the fitting portion of the inner cover (42) to the groove provided on the slide piece, The front surface (41a) of the outer cover (41) constituting the cylinder cover (26) is formed in a mountain shape in which the center portion projects forward from the left and right end portions in plan view, and the outer cover (41) Since both ends are bent rearward to form a side surface (41b), it is assumed that the foreign matter adhering to the work attachment when the work attachment is wound is caught between the work attachment and the cylinder cover. However, since the foreign matter pressed against the cylinder cover can escape to the left and right sides due to the shape of the front surface of the cylinder cover, deformation of the cylinder cover and damage to the boom cylinder can be ensured. It can be protected to prevent the.

  Next, embodiments of the present invention will be described with reference to the drawings. 1 is an overall side view showing a swivel working vehicle having a work machine structure according to the present invention, FIG. 2 is a side view showing a lower part of the work machine, FIG. 3 is a side view showing a support portion of a boom turning body, and FIG. Is a side view showing the boom bracket, FIG. 5 is a plan view showing the boom bracket, FIG. 6 is a plan view showing the hose cover, and FIG. 7 is a plan sectional view showing the cylinder cover. 8 is a cross-sectional plan view showing another embodiment of the cylinder cover, FIG. 9 is a side view showing the upper part of the boom, FIG. 10 is a rear view showing the arm cylinder, and FIG. 11 is a side view showing the base end of the arm cylinder. FIG. 12 is a side view showing the connecting portion between the arm and the boom, and FIG. 13 is a rear view of the same.

  First, the structure of the turning work vehicle which has the working machine structure of this invention is demonstrated. In FIG. 1, a turning work vehicle supports a turning body 2 at the upper center of a crawler type traveling device 1 so as to be able to turn left and right. Arranged freely. A bonnet 14 that covers the engine or the like is disposed above the revolving unit 2, and a driving operation unit 15 and a seat 16 are provided. A canopy 8 is disposed above the driving operation unit 15 and the seat 16. ing.

  Further, a boom bracket 12 is attached to the front end portion of the swing body 2 so as to be turnable in the left-right direction, and the lower end portion of the boom 6 is supported on the boom bracket 12 so as to be turnable up and down. The boom 6 is bent forward in the middle and is formed in a substantially “<” shape having a bent portion 6 d in a side view, and an arm 5 is rotatably supported on the upper end of the boom 6. A bucket 4 as a work attachment is rotatably supported at the tip of the arm 5. The boom 7, the arm 5, the bucket 4, and the like constitute a work machine 7.

  The boom 6 is rotated by a boom cylinder 11, the arm 5 is rotated by an arm cylinder 10, and the bucket 4 is rotated by a bucket cylinder 9. The boom cylinder 11, the arm cylinder 10, and the bucket cylinder 9 are constituted by hydraulic cylinders, and the cylinders 9, 10, and 11 are operated by operating levers disposed in the driving operation unit 15. The hydraulic oil is supplied to the hydraulic pump provided in the bonnet 14 of the swivel base 2 through the control valve provided in the hydraulic pump 15 so as to be extended and contracted.

  Further, the boom cylinder 11 is interposed between the cylinder support portion 12b of the boom bracket 12 and the boom cylinder bracket 36 provided on the middle front surface of the boom 6, and the arm cylinder 10 is provided on the middle rear surface of the boom 6. An arm cylinder bottom bracket 31 is interposed between the bucket cylinder bracket 30 provided at the base end of the arm 5, and the bucket cylinder 9 is interposed between the bucket cylinder bracket 30 and a bucket link 29 connected to the bucket 4. Has been.

  Next, the configuration of the work machine 7 will be described. As shown in FIG. 2, a boom bracket 12 is pivotally supported at the front end portion of the revolving structure 2 via a swing pin 13 so as to be rotatable left and right. The support 6a at the lower end of the boom 6 is connected to the support bracket 12a formed at the upper end of the boom bracket 12 and a pivot pin 18 so as to be pivotable in the front-rear direction, whereby the boom 6 is supported by the boom bracket 12. ing. The boom cylinder 11 is disposed in front of the boom 6, and a cylinder cover 26 is attached to the boom cylinder 11 to cover the front.

  An arm cylinder hydraulic hose 22 that supplies pressure oil to the arm cylinder 10 and a bucket cylinder hydraulic hose 21 that supplies pressure oil to the bucket cylinder 9 extend from the swing body 2 and extend along the back of the boom 6. It is piped. The arm cylinder hydraulic hose 22 and the bucket cylinder hydraulic hose 21 are fixed, for example, at two locations by fixing brackets 25 and 25 below the bent portion 6 d of the boom 6. Further, in the range from the vicinity of the bent portion 6d of the boom 6 to the lower end portion of the boom 6, a hose cover 27 is disposed behind the arm cylinder hydraulic hose 22 and the bucket cylinder hydraulic hose 21, and each hydraulic hose is provided. 21 and 22 are covered.

  Next, the piping configuration of the boom cylinder hydraulic hose 23 for supplying pressure oil to the lower end portion of the boom 6 and the boom cylinder 11 will be described with reference to FIGS. A lower end portion of the boom cylinder 11 interposed between the boom 6 and the boom bracket 12 is rotatably supported by a cylinder support portion 12 b of the boom bracket 12. On the left and right sides of the cylinder support portion 12b of the boom bracket 12, ribs 12d projecting forward are formed downward from the support bracket 12a, respectively. Between the rib 12d and the cylinder support portion 12b, A hose groove 12e is formed.

  The boom cylinder hydraulic hose 23 extending forward from the swivel body 2 is piped so as to pass through the hose groove 12e after passing between the pair of left and right boom support portions 12a at the upper end of the boom bracket 12. . Further, a concave portion 12f recessed backward is formed in the middle portion of the hose groove 12e in the vertical direction, and the boom cylinder hydraulic hose 23 piped in the hose groove 12e is curved along the concave portion 12f. is doing. The boom cylinder hydraulic hose 23 piped from the upper side to the lower side along the hose groove 12e is bent upward at the lower part of the hose groove 12e and then connected to the lower end of the boom cylinder 11.

  The boom cylinder hydraulic hose 23 is provided with a margin so that the boom cylinder 11 is bent when the boom cylinder 11 is rotated upward so that the boom cylinder 11 is not stretched when the boom cylinder 11 is rotated downward. However, in this example, as described above, the recess 12f is formed in the hose groove 12e, and the boom cylinder hydraulic hose 23 is piped along the recess 12f. The margin of the hydraulic hose 23 can be absorbed, and the boom cylinder hydraulic hose 23 can be prevented from protruding forward from the boom cylinder 11. Further, the radius of curvature of the boom cylinder hydraulic hose 23 is increased, and the hydraulic oil hose 23 is not broken and does not stop the flow of hydraulic oil. Accordingly, the boom cylinder hydraulic hose 23 can be reliably protected by the boom bracket, and the boom cylinder hydraulic hose 23 can be prevented from colliding with an obstacle and being damaged.

  Next, the configuration of the hose cover 27 will be described with reference to FIGS. The arm cylinder hydraulic hose 22 and the bucket cylinder hydraulic hose 21 are piped along the rear surface of the boom 6 upward from the lower end of the boom 6, and are fixed to the boom 6 by a fixing bracket 25. . A hose cover 27 is disposed behind the arm cylinder hydraulic hose 22 and the bucket cylinder hydraulic hose 21, and the hose cover 27 is fixed to the rear surface of each fixing bracket 25 with a bolt or the like.

  The hose cover 27 is composed of a plate-like member, and is arranged over a range from the lower end of the boom 6 to the vicinity of the bent portion 6d. The left and right ends of the hose cover 27 are bent forward, and the hose cover 27 covers the rear and left and right sides of the arm cylinder hydraulic hose 22 and the bucket cylinder hydraulic hose 21. In this way, the hydraulic hoses 21 and 22 that are piped below the bent portion 6d of the boom 6 and are easily noticeable are covered with the hose cover 27 from the rear and the left and right sides, so that each hydraulic hose is covered. It becomes possible to hide 21 and 22 so that it cannot be seen from the outside, and the appearance can be improved. In addition, if the hydraulic hoses 21 and 22 are damaged due to deterioration over time, the hose cover 27 can prevent the hydraulic oil from being scattered around the boom. This makes it possible to simplify the operation and does not spill hydraulic fluid on the operator.

  Next, the configuration of the cylinder cover 26 attached to the boom cylinder 11 will be described. As shown in FIGS. 2 and 7, the cylinder cover 26 includes an outer cover 41 and an inner cover 42, and the inner cover 42 is fixed to the outer cover 41. The outer cover 41 is attached to a seat fixed to the head portion (upper end portion) of the rod 11a of the boom cylinder 11 via a fixture 28, and in a state where the rod 11a of the boom cylinder 11 is extended to the maximum. The lower end extends to a position where it overlaps the upper end of the cylinder body 11b.

  Further, the front surface 41a of the outer cover 41 is formed in a mountain shape in which the substantially right and left central portions protrude forward from the both ends in plan view, and both ends of the front surface 41a are bent rearward to form side surfaces 41b. is doing.

  In this way, the cylinder cover 26 has its upper end held by the head of the rod 11a of the boom cylinder 11 via the bolt and the seat, and its lower end supported slidably by the cylinder body 11b. Regardless of the expansion / contraction state of 11, the boom cylinder 11 is constructed so as to cover and protect the front of the rod 11a of the boom cylinder 11 to prevent the boom cylinder 11 from being damaged. Then, as described above, the front surface 41a of the outer cover 41 is formed in a mountain shape in which the left and right central portions protrude forward from the both ends in plan view, so that the bucket 4 adheres to the bucket 4 when it is rolled up. Even if the foreign matter that has been trapped between the bucket 4 and the cylinder cover 26, the foreign matter that is pressed against the cylinder cover 26 by the bucket 4 depends on the shape of the front surface 41 a of the outer cover 41 and the left and right sides of the cylinder cover 26. Therefore, deformation of the cylinder cover 26 and breakage of the boom cylinder 11 can be prevented.

  The cylinder cover 26 may be configured as follows. That is, like the cylinder cover 26 ′ shown in FIG. 8, the front surface 26b ′ is formed in an arc shape, and in the same way as described above, the front surface 26b ′ has a substantially central portion on the left and right sides in plan view than the both ends. The shape protrudes forward. In the case of this example, the cylinder cover 26 ′ is formed by bending a single plate-like member without distinguishing between the outer cover and the inner cover, and is attached to the left and right sides of the boom cylinder 11 via fixtures 59 a. A fitting portion 26a ′ formed by bending both ends of the cylinder cover 26 ′ is slidably fitted to the slide piece 59.

  Next, the structure of the middle part of the boom 6 will be described with reference to FIGS. As described above, the boom 6 is bent forward in the middle and is formed in a substantially “<” shape in side view. The arm cylinder bottom bracket 31 is provided on the back of the middle of the boom 6 and the base end of the arm 5 is provided. A bucket cylinder bracket 30 is provided at a portion, and an arm cylinder 10 for rotating the arm 5 is interposed between the arm cylinder bottom bracket 31 and the bucket cylinder bracket 30. The upper end portion of the arm cylinder 10 is supported by a bucket cylinder bracket 30, and the lower end portion of the arm cylinder 10 is supported by an arm cylinder bottom bracket 31. A pair of left and right arm cylinder bottom brackets 31 are provided on the rear surface of the boom 6 and are disposed in the vicinity of the bent portion 6d.

  The arm cylinder 10 is connected to an arm cylinder hydraulic hose 22 piped on the back of the boom 6. The arm cylinder hydraulic hose 22 is connected to the base end portion (lower end portion in FIG. 9) of the arm cylinder 10 via a nipple 33, both on the extension side and the reduction side. One of the arm cylinder hydraulic hoses 22 connected to the base end of the arm cylinder 10 is connected to a cylinder head side hydraulic pipe 10a attached to the arm cylinder 10 via a nipple 33, and the other is Connected to the pipe protruding from the bottom cylinder.

  Further, as shown in FIG. 9, the nipple 33 has an axial direction (connection direction of the arm cylinder hydraulic hose 22) P of the nipple 33 when the arm cylinder 10 is at the maximum operating position R in a side view. The arm cylinder hydraulic hose 22 attached to the nipple 33 is attached to the arm cylinder 10 at an inclination angle such that the arm cylinder hydraulic hose 22 is in light contact with the back of the boom 6. The mounting position of the nipple 33 on the arm cylinder 10 is near the bottom of the arm cylinder 10, and the arm cylinder hydraulic hose 22 connected to the nipple 33 is bent along the shape of the back surface of the boom 6. The inclination direction of the nipple 33 is such that the degree of bending of the arm cylinder hydraulic hose 22 is reduced when the arm cylinder 10 is expanded and contracted.

  Here, the arm 5 is rotated up and down by expanding and contracting the rod 10b of the arm cylinder 10 interposed between the bucket cylinder bracket 30 and the arm cylinder bottom bracket 31. By the moving operation, the arm cylinder bottom bracket 31 is turned up and down around the support portion, and accordingly, the nipple 33 is similarly turned. When the nipple 33 rotates, the degree of bending of the arm cylinder hydraulic hose 22 connected to the nipple 33 changes and the bending condition also changes. As described above, the nipple 33 is connected to the arm cylinder hydraulic hose 22. For the arm cylinder when the arm cylinder 10 is rotated as compared with the case where the nipple 33 is not inclined with respect to the axis O. A change in the degree of bending of the hydraulic hose 22 can be reduced. As a result, when the arm cylinder 10 rotates, the stress and excessive force applied to the arm cylinder hydraulic hose 22 due to bending can be reduced, and the fatigue of the arm cylinder hydraulic hose 22 can be suppressed and durability can be reduced. Can be improved.

  Further, by attaching the nipple 33 to which the arm cylinder hydraulic hose 22 is connected to the base end portion of the arm cylinder 10, the length of the arm cylinder hydraulic hose 22 that is a consumable part and is to be replaced can be shortened. Therefore, the cost can be reduced. Further, even if pressure oil leaks in the vicinity of the connection portion between the arm cylinder hydraulic hose 22 and the nipple 33, the pressure oil is scattered by the hose cover 27 extending to the vicinity of the bent portion 6 d of the boom 6. Can be prevented.

  Next, the piping configuration of the bucket cylinder hydraulic hose 21 at the connecting portion between the boom 6 and the arm 5 will be described with reference to FIGS. A pair of left and right arm fulcrum brackets 51 are fixed to the tip of the boom 6 and extend from the tip of the boom 6 to the front. The arm 5 is rotatably supported at the front end portion of the arm fulcrum bracket 51. A pair of left and right bucket cylinder brackets 30 is fixed to the base end portion of the arm 5, and the bucket cylinder bracket 30 rotatably supports the distal end portion of the rod 10 b of the arm cylinder 10, and the bucket cylinder 9. The base end portion is supported rotatably. Also, a bucket cylinder hydraulic hose 21 for supplying pressure oil to the bucket cylinder 9 piped on the back of the boom 6 passes between the bucket cylinder brackets 30 and extends to the arm 5 side. It is connected.

  A guide plate 55 that connects the left and right bucket cylinder brackets 30 to each other is attached to the bucket cylinder bracket 30, and the guide plate 55 is disposed from the support portion of the arm cylinder 10 of the bucket cylinder bracket 30 to the bucket cylinder 9. Has been. A rear portion 55b (side portion of the arm cylinder 10) of the guide plate 55 is formed in a flat plate shape along the upper end surface of the bucket cylinder bracket 30 and is substantially parallel to the arm 5, and a front portion 55a (side portion of the bucket cylinder 9). Are bent inward to form a substantially U-shape in side view.

  The bucket cylinder hydraulic hose 21 is disposed below the guide plate 55, that is, inside the guide plate 55. That is, the bucket cylinder hydraulic hose 21 passes through the space 60 surrounded by the arm 5 or boom 6, the left and right bucket cylinder brackets 30, and the guide plate 55. Also, the bucket cylinder hydraulic hose 21 is piped in accordance with the length required when the arm 5 is rotated to the lowermost position so that the arm cylinder 5 can follow the rotating operation of the arm cylinder. When 10 is reduced and the arm 5 is rotated upward, the bucket cylinder hydraulic hose 21 bends excessively.

  At the connecting portion between the arm 5 and the boom 6, the bucket cylinder hydraulic hose 21 having an excessive length is bent, but the bucket cylinder hydraulic hose 21 passes through the space 60, so It bends within 60 and does not protrude outside. Further, since the front portion 55a of the guide plate 55 enters the inner side of the space 60, when the bucket cylinder hydraulic hose 21 is bent, the bending posture is restricted to some extent by the front portion 55a, and an excessive force is applied. It can be bent in a natural bending posture that does not take up.

  Further, since the rear portion 55b of the guide plate 55 is attached to the upper end portion of the bucket cylinder bracket 30 so as to ensure a large space 60, the bent bucket cylinder hydraulic hose 21 can be stored with a margin. is there. Further, by providing the guide plate 55 between the left and right bucket cylinder brackets 30, the rigidity of the bucket cylinder bracket 30 can be improved, and a support hole for supporting the arm cylinder 10, the bucket cylinder 9 and the like is formed. At this time, the bucket cylinder bracket 30 can be prevented from being distorted or deformed.

  That is, at the front end of the boom bracket, a hose groove is formed in the vertical direction for a hydraulic hose extending from the swing body and connected to the boom cylinder to pass therethrough, and a recessed portion that is recessed backward in the middle of the hose groove. Since it is formed, the recessed portion can accommodate and absorb the surplus when the hydraulic hose connected to the boom cylinder is bent, and can prevent the hydraulic hose from protruding forward than the boom cylinder. . As a result, the hydraulic hose can be reliably protected by the boom bracket, the hydraulic hose can be prevented from colliding with an obstacle and damaged, and the flow of the hydraulic fluid is not hindered.

In addition, since the hose cover that covers the back of the hydraulic hose piped on the back of the boom is arranged from the lower end of the boom to the vicinity of the bent part, it is easy to see the part that is easily visible and is piped below the bent part of the boom. By covering the hydraulic hose with a hose cover, the hydraulic hose can be hidden from view from the outside, and the appearance can be improved.
Also, in the unlikely event that the hydraulic hose deteriorates over time, the hose cover can prevent pressure oil from splashing around the boom, simplifying post-processing operations. It becomes possible and does not cost the operator.

  Furthermore, both the extension-side hydraulic hose and the reduction-side hydraulic hose that supply pressure oil to the arm cylinder interposed between the boom and the arm are connected to the base end of the arm cylinder, Since the connecting direction of the hose is inclined with respect to the axial direction of the arm cylinder, the hydraulic hose when the arm cylinder is rotated is compared with the case where the connecting direction of the hydraulic hose is not inclined with respect to the axial direction. It is possible to reduce the change in the degree of bending. As a result, when the arm cylinder rotates, the stress and excessive force applied to the hydraulic hose due to bending can be reduced, and fatigue of the hydraulic hose can be suppressed and durability can be improved.

  Further, by connecting the hydraulic hose to the base end portion of the arm cylinder, the length of the hydraulic hose that is a consumable part and to be replaced can be shortened, so that the cost can be reduced. Furthermore, even if pressure oil leaks in the vicinity of the connection portion of the hydraulic hose with the arm cylinder, the hose cover extending to the vicinity of the bent portion of the boom can prevent the pressure oil from scattering.

  In addition, a pair of left and right attachment cylinder brackets that support the base end of the attachment cylinder is provided at the base end of the arm, and a hydraulic hose that supplies pressure oil to the attachment cylinder is passed between the left and right attachment cylinder brackets. A guide plate for connecting the attachment cylinder bracket is provided, the guide plate is disposed outside the hydraulic hose, and a part of the guide plate is bent inward. It passes through the space surrounded by the bucket cylinder bracket and the guide plate, and it is possible to prevent the hydraulic hose that is bent at the connecting portion between the arm and the boom from protruding to the outside.

  In addition, when the hydraulic hose is bent, the bending posture is regulated by the bent portion of the guide plate so that the hydraulic hose can be bent to a natural bending posture where no excessive force is applied, and the space through which the hydraulic hose passes. It is possible to store the bent hydraulic hose with a margin while ensuring a large space. Moreover, the rigidity of the bucket cylinder bracket can be improved by the guide plate, and the bucket cylinder bracket is prevented from being distorted or deformed when forming a support hole for supporting the arm cylinder, the bucket cylinder or the like. be able to.

It is a whole side view showing the turning work vehicle which comprises the working machine structure of the present invention. It is a side view which shows the lower part of a working machine. It is a side view which shows the support part by the turning body of a boom. It is a side view which shows a boom bracket. It is a top view which shows a boom bracket. It is a top view which shows a hose cover. It is a plane sectional view showing a cylinder cover. It is a plane sectional view showing another example of a cylinder cover. It is a side view which shows the upper part of a boom. It is a rear view which shows an arm cylinder. It is a side view which shows the base end part of an arm cylinder. It is a side view which shows the connection part of an arm and a boom. Similarly it is a rear view.

2 Revolving body 5 Arm 6 Boom 6d Bending part 7 Working machine 9 Bucket cylinder 10 Arm cylinder 11 Boom cylinder 12 Boom bracket 12d Rib 12e Hose groove 12f Recessed part 21 Bucket cylinder hydraulic hose 22 Arm cylinder hydraulic hose 23 Boom cylinder hydraulic Hose 26 Cylinder cover 27 Hose cover 30 Attachment cylinder bracket 33 Nipple 55 Guide plate

Claims (1)

A boom (6) attached to a revolving structure (2) configured to be capable of pivoting with respect to an operation unit (15) via a boom bracket (12), and the boom (6). An arm (5) rotatably attached to the arm (5) and a work attachment (4) rotatably attached to the arm (5). The boom bracket (12) and the boom (6) In a turning work vehicle in which a boom cylinder (11) interposed therebetween is disposed in front of the boom (6), a cylinder cover (26) that covers the front of the boom cylinder (11) is provided, and the cylinder cover ( 26) is composed of an outer cover (41) and an inner cover (42), the inner cover (42) is fixed to the outer cover (41), and both ends of the inner cover (42) are bent inwardly and fitted. Forming a joint, The slide piece is fixed to the left and right side positions of the slider (11) with a fixing tool, and the fitting portion of the inner cover (42) is slidably fitted into the groove provided on the slide piece, and the cylinder cover (26 The front surface (41a) of the outer cover (41) constituting the outer cover (41) is formed in a mountain shape in which the central portion projects forward from the left and right ends in plan view, and both ends of the outer cover (41) are bent backward. A turning work vehicle characterized in that a side surface (41b) is formed .

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