JP7369311B2 - turning work vehicle - Google Patents

Description

The present invention relates to a swinging work vehicle, for example, a swinging work vehicle having a swing function.

A swinging work vehicle such as a backhoe includes a lower traveling body, an upper rotating body that is provided so as to be able to rotate above the lower traveling body, and a work implement that is supported at the front part of the upper rotating body so that it can move up and down. ing.

Patent Document 1 discloses that a revolving frame of an upper revolving body includes a bottom plate, left and right vertical plates extending in the front-rear direction on the bottom plate, and left and right vertical plates with both ends inclined diagonally downward toward the front side. It consists of vertical plates and horizontal plates fixed to each other, and at least one of the vertical plates has a pivot hole provided above the horizontal plates through which a hydraulic hose extending toward the work equipment is inserted. Type construction machinery is listed.

Further, in Patent Document 2, at least one of the vertical plate and the horizontal plate of the upper frame (corresponding to the rotating frame) has a pair of protrusions on its upper edge, and is disposed between the pair of protrusions. The work machine through which the cables (hydraulic hoses, etc.) are passed is described. In Patent Document 2, a wiring object is inserted into a through hole of a grommet, and the grommet is fitted between a pair of protrusions.

By the way, in order to improve work efficiency in narrow spaces, swinging work vehicles are equipped with a so-called swing function that not only allows the work equipment to rotate vertically, but also allows the base end of the work equipment to rotate horizontally. There are cases. In a swing work vehicle equipped with a swing function, a hydraulic swing cylinder is arranged on the swing frame. In the swing cylinder, a cylinder tube is pivotally connected to a revolving frame, and a cylinder rod is pivotally connected to a base end of a working machine, and as the cylinder rod expands and contracts, the swing cylinder horizontally rotates with respect to the revolving frame.

The hydraulic hose routing structure described in Patent Document 1 is suitable for routing a hydraulic hose connected to a boom cylinder or arm cylinder installed above, but it is suitable for routing a hydraulic hose connected to a boom cylinder or arm cylinder installed below. Not suitable for routing connected hydraulic hoses.

Furthermore, in Patent Document 2, the hole diameter of the through-hole formed in the grommet is designed to match the wiring object to be inserted so that there is no gap, so that the wiring object slides through the through-hole of the grommet. It is difficult to do so. Therefore, the hydraulic hose inserted through the through hole of the grommet cannot follow the actuator that rotates with respect to the revolving frame like a swing cylinder.

Patent No. 3377198 JP2013-87423A

The present invention has been made in view of the above circumstances, and its purpose is to provide a swing work vehicle having a swing function, in which a hydraulic hose connected to a swing cylinder can follow the swinging motion of the swing cylinder. Our goal is to provide a rotating work vehicle.

The turning work vehicle of the present invention includes a lower traveling body;
an upper rotating body that is rotatably provided above the lower traveling body;
a revolving frame that constitutes the bottom of the upper revolving body;
a rocking body horizontally rotatably supported at the front part of the swing frame;
a working machine supported by the rocking body so as to be movable up and down;
a first vertical plate and a second vertical plate, which are located on the bottom plate of the revolving frame with an interval left and right, and are erected so as to extend in the front-back direction;
a hydraulic swing cylinder that is provided on the opposite side of the first vertical plate across the second vertical plate and connects the rotating frame and the rocking body;
a protrusion protruding from a side wall of the second vertical plate above the swing cylinder toward the swing cylinder;
a hose guide provided on the protrusion;
A hydraulic hose passes above the first vertical plate and the second vertical plate, penetrates the hose guide from above to below, and reaches the swing cylinder.

In the swing work vehicle of the present invention, the hose guide includes a recessed portion formed in the protruding piece to accommodate the hydraulic hose, and a closing member that closes an open end of the recessed portion. But that's fine.

Further, in the swinging work vehicle of the present invention, hydraulic oil tanks arranged on the left and right outer sides of the second vertical plate;
a bracket that fixes a lower part of the hydraulic oil tank to the protrusion;
The bracket may include a cutout portion formed at a position corresponding to the hose guide.

According to the present invention, since the hose guide is provided on the projecting piece protruding from the upper side wall of the second vertical plate adjacent to the swing cylinder, a plurality of hydraulic hoses leading to the swing cylinder are concentrated near the swing cylinder. And again multiple hydraulic hoses can be distributed. Thereby, when the swing cylinder swings due to expansion and contraction of the swing cylinder, the hydraulic hose connected to the swing cylinder can follow the swing of the swing cylinder.

A perspective view showing an example of a turning work vehicle according to the present invention Perspective view of rotating frame Top view of the pivoting frame An enlarged perspective view of the hose guide Exploded perspective view of the swing frame and hydraulic oil tank An enlarged perspective view showing the installation location of the hydraulic oil tank

Embodiments of the present invention will be described with reference to the drawings.

[Overview of swing work vehicle]
As shown in FIG. 1, the swinging work vehicle 1 is horizontally rotatably supported by a lower traveling body 2, an upper rotating body 3 that is rotatably provided above the lower traveling body 2, and an upper rotating body 3. The present invention includes a boom bracket 4, which is a swinging body, and a work implement 5 supported by the boom bracket 4 so as to be movable up and down. The swinging work vehicle 1 is configured as a shovel (backhoe) with a boom swing function. Generally, a boom swing function is installed on mini excavators that require workability in narrow spaces.

The lower traveling body 2 is driven by receiving power from the engine 60, and causes the turning work vehicle 1 to travel and turn. The lower traveling body 2 includes a pair of left and right crawlers 21, 21, and a pair of left and right travel motors 22, 22 that drive them. Further, the lower traveling body 2 includes a pair of blade arms 23, 23, a blade 24 as a soil removal plate extending in the left-right direction between the tip ends thereof, and a blade cylinder for vertically moving the blade 24. 25 are provided.

The upper revolving body 3 is configured to be able to rotate around an axis extending in the vertical direction at its central portion. The upper revolving body 3 is provided with an engine 60, a swing motor 61, a control section 62, and the like. The control section 62 is equipped with a control seat, operating devices, and the like.

The boom bracket 4 is attached to the front end of the upper revolving body 3 via an attachment portion 35. The boom bracket 4 is supported by the mounting portion 35 so as to be horizontally rotatable (that is, swingable from side to side). A swing cylinder 41 (see FIGS. 2 and 3) that extends and contracts in the front and rear directions is provided between the upper revolving body 3 and the boom bracket 4. The horizontal rotation of the boom bracket 4 is activated according to the expansion and contraction of the swing cylinder 41.

The work machine 5 is driven by receiving power from an engine 60, and performs earth and sand excavation work in response to operations at a control section 62. The work machine 5 is supported by the boom bracket 4 so as to be movable up and down. The boom bracket 4 is provided with a pivot pin 54 whose axis is oriented in the horizontal direction. A base end portion of the working machine 5 (a base end portion of a boom 51 to be described later) is supported so as to be vertically movable around a pivot pin 54 thereof. Further, the work machine 5 can perform a swing operation in conjunction with the horizontal rotation of the boom bracket 4.

The work machine 5 includes a boom 51, an arm 52, and a bucket 53. The boom 51 is attached to the boom bracket 4 so as to be movable up and down. The boom 51 extends vertically from a base end supported by the boom bracket 4, and is bent in a boomerang shape when viewed from the side. A telescopically movable boom cylinder 51a is provided between the boom bracket 4 and the midway portion of the boom 51. The boom 51 moves up and down with respect to the boom bracket 4 in accordance with the expansion and contraction of the boom cylinder 51a.

The arm 52 is attached to the boom 51 so as to be movable up and down. A pivot pin 55 whose axis is directed horizontally is provided at the tip of the boom 51. The base end of the arm 52 is supported so as to be vertically movable (back and forth rotation) about a pivot pin 55 thereof. A telescopically movable arm cylinder 52a is provided between the midway portion of the boom 51 and the base end portion of the arm 52. The arm 52 moves up and down with respect to the boom 51 in accordance with the expansion and contraction of the arm cylinder 52a.

The bucket 53 is attached to the arm 52 so as to be movable up and down. A pivot pin 56 whose axis is directed horizontally is provided at the tip of the arm 52. The base end portion of the bucket 53 is supported so as to be vertically movable (back and forth rotation) about a pivot pin 56 thereof. A bucket link 57 is interposed between the tip of the arm 52 and the bucket 53. The bucket link 57 is configured as a link that transmits driving force to the bucket 53. A telescopically movable bucket cylinder 53a is provided between the bucket link 57 and the base end of the arm 52. The bucket 53 moves up and down with respect to the arm 52 in accordance with the expansion and contraction of the bucket cylinder 53a.

The upper revolving body 3 has an engine 60, a battery, a fuel tank, etc. mounted on a revolving frame 30, which are covered with a bonnet 66, and a control section 62 is disposed in the front part thereof. A hydraulic pump 63 is connected to the engine 60, and the hydraulic pump 63 is driven by the engine 60 and discharges hydraulic oil. The hydraulic oil discharged from the hydraulic pump 63 is delivered to the swing cylinder 41, boom cylinder 51a, arm cylinder 52a, bucket cylinder 53a, blade cylinder 25, travel motors 22, 22, It is supplied to the swing motor 61 and the like.

The rotating frame 30 includes a flat bottom plate 31, a first vertical plate 32, and a second vertical plate 33. Further, the swing frame 30 includes an upper plate 34 above the bottom plate 31 to which the front end of the control section 62 is fixed. The upper plate 34 is fixed to the upper ends of a pair of front struts 34a, 34a erected at the front end of the bottom plate 31.

The bottom plate 31 has a circular shape with a front end cut away in the left-right direction when viewed from above. The first vertical plate 32 and the second vertical plate 33 are located on the bottom plate 31 with an interval left and right, and are erected so as to extend in the front-rear direction. The first vertical plate 32 is arranged to the left of the horizontal center of the rotating frame 30, and the second vertical plate 33 is arranged to the right of the horizontal center of the rotating frame 30. A joint opening 31a for inserting a swivel joint and a motor opening 31b for attaching a swing motor 61 are provided in the bottom plate 31 between the first vertical plate 32 and the second vertical plate 33. Further, the bottom plate 31 is formed with a plurality of other openings for drainage and maintenance.

The lower edges of the first vertical plate 32 and the second vertical plate 33 are welded to the upper surface of the bottom plate 31. A front end portion 32a of the first vertical plate 32 and a front end portion 33a of the second vertical plate 33 protrude forward from the bottom plate 31 and constitute a part of the attachment portion 35. Further, the rear end portion 32b of the first vertical plate 32 is connected to the third vertical plate 36 via a connecting portion 36a. The third vertical plate 36 is erected to extend in the front-rear direction from near the center of the bottom plate 31 to the rear end. The second vertical plate 33 extends to the rear end of the bottom plate 31.

A mounting portion 35 to which the boom bracket 4 is attached is provided at the front end of the swing frame 30 so as to protrude forward. The mounting portion 35 has a tapered shape in plan view, and has an insertion hole 35a opened in the vertical direction at its front end into which a pivot pin (not shown) is inserted. The mounting portion 35 includes a pair of upper and lower stays 351 and 352 that are spaced apart from each other. The upper stay 351 is attached to the upper plate 34 so as to protrude forward. The lower stay 352 is attached to the front upper surface of the bottom plate 31 and protrudes forward from the front end of the bottom plate 31. A pair of stays 351 and 352 sandwich the front end 32a of the first vertical plate 32 and the front end 33a of the second vertical plate 33 from above and below.

A control unit 64 is arranged on the left side of the first vertical plate 32. The control unit 64 includes control valves that control the operation of hydraulic cylinders (swing cylinder 41, boom cylinder 51a, arm cylinder 52a, bucket cylinder 53a, blade cylinder 25) and hydraulic motors (travel motors 22, 22, swing motor 61). is arranged. The control unit 64 includes at least a control valve that controls the operation of the swing cylinder 41.

A swing cylinder 41 is arranged on the right side of the second vertical plate 33 along the front-rear direction. In the swing cylinder 41, a cylinder tube 41a is rotatably supported by a cylinder mounting portion 37 formed on the swing frame 30, and a cylinder rod 41b is rotatably connected to the boom bracket 4. By expanding and contracting the cylinder rod 41b, the boom bracket 4 can be rotated left and right. Accordingly, the swing cylinder 41 swings left and right about the cylinder mounting portion 37.

A protruding piece 38 that protrudes to the right side (toward the swing cylinder 41 side) is provided at the upper part of the side wall of the second vertical plate 33. The protruding piece 38 is located above the swing cylinder 41. The protruding piece 38 has a plate shape that extends in the horizontal direction. The protruding piece 38 is welded to the second vertical plate 33.

A hose guide 39 is provided on the protruding piece 38. First and second hydraulic hoses 41c and 41d connecting the control unit 64 and the swing cylinder 41 are passed through the hose guide 39. The first and second hydraulic hoses 41c and 41d pass from the control unit 64 above the first vertical plate 32 and the second vertical plate 33, penetrate the hose guide 39 from above to below, and reach the swing cylinder 41. Since the hose guide 39 is arranged so as to partially overlap the cylinder tube 41a of the swing cylinder 41 in plan view (see FIG. 3), the first hydraulic hose that reaches the cylinder tube 41a side near the swing cylinder 41 41c and the second hydraulic hose 41d extending to the cylinder rod 41b side can be combined, and the first and second hydraulic hoses 41c and 41d can be distributed again. Therefore, when the swing cylinder 41 swings, the first and second hydraulic hoses 41c and 41d can follow the swing of the swing cylinder 41. In addition, by providing the hose guide 39 on the protruding piece 38, there is no need to form holes etc. in the first vertical plate 32 and the second vertical plate 33 for passing the hydraulic hose. There is no need to add reinforcement to the vertical plate 33.

FIG. 4 is an enlarged view of the hose guide 39. The hose guide 39 includes a recessed portion 38a formed at the tip end of the projecting piece 38, and a closing member 39a that closes the open end of the recessed portion 38a. The recessed cutout 38a is cut out in a substantially U-shape, and can accommodate the first and second hydraulic hoses 41c and 41d. The recessed part 38a is formed in a size that allows the first and second hydraulic hoses 41c and 41d to slide thereon.

The closing member 39a is a metal round rod formed into a substantially U-shape, and both ends of the closing member 39a are fixed to the opening of the recessed notch 38a by welding or the like. The closing member 39a is arranged so that the right side is higher than the left side. The closing member 39a prevents the first and second hydraulic hoses 41c and 41d from separating from the recessed cutout 38a. Since the closing member 39a is formed of a round bar, it is difficult to be damaged even if the first and second hydraulic hoses 41c and 41d contact or slide.

A hydraulic oil tank 65 is arranged on the right side of the second vertical plate 33, as shown in FIG. The hydraulic oil tank 65 stores hydraulic oil for the hydraulic pump 63, and is connected to the hydraulic pump 63 by a hydraulic hose (not shown). The hydraulic oil tank 65 is arranged at the center of the right end of the swing frame 30 in the front-rear direction. A lower end portion of the hydraulic oil tank 65 is fixed to the bottom plate 31.

The hydraulic oil tank 65 is arranged so as to overlap the swing cylinder 41 in a plan view, and a recess 65a extending in the front-rear direction is formed in the lower left part of the hydraulic oil tank 65 so as not to interfere with the swing cylinder 41. There is. The recess 65a of the hydraulic oil tank 65 is fixed to the protrusion 38 via a bracket 651. The bracket 651 has one end fixed to the recess 65a, and the other end extending beyond the left end of the hydraulic oil tank 65.

The left end of the bracket 651 is provided with a cutout 651a formed into a substantially U-shape. The cutout portion 651a is provided at a position corresponding to the hose guide 39 when the bracket 651 is fixed to the protrusion piece 38 with a bolt 652, that is, at a position corresponding to the recessed cutout portion 38a of the protrusion piece 38. Thereby, the first and second hydraulic hoses 41c and 41d can be stably aligned with the notch 651a of the bracket 651 of the hydraulic oil tank 65 using the hose guide 39, so that the space inside the bonnet 66 can be effectively utilized. In addition, the first and second hydraulic hoses 41c and 41d penetrate the hose guide 39 and are piped along the notch 651a of the bracket 651 of the hydraulic oil tank 65, so the first and second hydraulic hoses 41c and 41d Even with a structure in which the hydraulic oil tank 65 is installed near the hose, it is easy to assemble other parts after the hose is attached.

The present invention is not limited to the embodiments described above, and various improvements and changes can be made without departing from the spirit of the present invention.

1 Swinging work vehicle 2 Lower traveling body 3 Upper rotating body 4 Boom bracket 5 Work equipment 6 Boom 7 Arm 8 Bucket 30 Swivel frame 31 Bottom plate 32 First vertical plate 33 Second vertical plate 35 Mounting part 38 Projection piece 38a Recessed part 39 Hose guide 39 Closure member 41 Swing cylinder 41c First hydraulic hose 41d Second hydraulic hose 63 Hydraulic pump 65 Hydraulic oil tank 651 Bracket 651a Notch

Claims (7)

a lower running body;
an upper rotating body that is rotatably provided above the lower traveling body;
a revolving frame that constitutes the bottom of the upper revolving body;
a rocking body horizontally rotatably supported at the front part of the swing frame;
a working machine supported by the rocking body so as to be movable up and down;
a hydraulic swing cylinder that connects the revolving frame and the swinging body and is supplied with oil from a hydraulic pump via a control unit;
A swing work vehicle, comprising : a vertical plate extending in the front-rear direction on the bottom plate of the swing frame ;
A hydraulic hose extending from the control unit to the swing cylinder is located above the swing cylinder and above the vertical plate . The turning work vehicle according to claim 1, wherein the hydraulic hose includes a first hydraulic hose extending to one side of the swing cylinder and a second hydraulic hose extending to the other side of the swing cylinder. The swinging work vehicle according to claim 2, wherein the first hydraulic hose and the second hydraulic hose are arranged on the swing cylinder in parallel in the longitudinal direction of the swing cylinder in plan view. The first hydraulic hose extends to one side of the swing cylinder on the side of the swing cylinder in plan view,
The swinging work vehicle according to claim 2 or 3, wherein the second hydraulic hose extends to the other side of the swing cylinder at a side of the swing cylinder in plan view. The vertical plate includes a first vertical plate and a second vertical plate located on the bottom plate of the rotating frame with an interval left and right,
The swing cylinder is arranged on the side of the second vertical plate,
4. On a side of the swing cylinder opposite to the second vertical plate, the first hydraulic hose extends to one side of the swing cylinder, and the second hydraulic hose extends to the other side of the swing cylinder. The swinging work vehicle described. The swinging work vehicle according to claim 5, wherein the first hydraulic hose and the second hydraulic hose are located above the second vertical plate. The swinging work vehicle according to claim 5 or 6, wherein the first hydraulic hose and the second hydraulic hose are guided to the sides of the second vertical plate.