JP2022066515A - Revolving work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a revolving work vehicle that has a swing function, and enables hydraulic hoses coupled to a swing cylinder to follow up swing of a swing cylinder.

SOLUTION: A revolving work vehicle 1 comprises: a lower travel body 2; an upper revolving body 3; a revolving frame 30 constituting a bottom part of the upper revolving body 3; a boom bracket 4 (swing body) supported horizontally rotatably on a front part of the revolving frame 30; a working machine 5 supported vertically rotatably on the boom bracket 4; and a hydraulic type swing cylinder 41 coupling the revolving frame 30 and boom bracket 4, and supplied with oil from a hydraulic pump 63 through a control unit 64. Hydraulic hoses 41c, 41d extending to the swing cylinder 41 from the control unit 64 are guided by a hose guide 39 arranged above the swing cylinder 41.

SELECTED DRAWING: Figure 2

COPYRIGHT: (C)2022,JPO&INPIT

Description

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

A turning work vehicle such as a backhoe is provided with a lower traveling body, an upper turning body provided so as to be able to turn above the lower traveling body, and a working machine supported so as to be vertically rotatable at the front portion of the upper turning body. ing.

In Patent Document 1, the swivel frame of the upper swivel body has a bottom plate, left and right vertical plates erected on the bottom plate in the front-rear direction, and both ends are left and right in a state of being inclined diagonally downward toward the front side. It is composed of horizontal plates fixed to each of the vertical plates, and at least one of the vertical plates is swiveled with a hose insertion hole above the horizontal plate into which a hydraulic hose extending toward the work machine is inserted. The type construction machine is described.

Further, in Patent Document 2, at least one plate material of a vertical plate and a horizontal plate of an upper frame (corresponding to a swivel frame) has a pair of protrusions on its upper edge, and is arranged between the pair of protrusions. The work machine through which the cable (hydraulic hose, etc.) is passed is described. In Patent Document 2, the grommet is inserted into the through hole of the grommet so that the grommet is fitted between the pair of protrusions.

By the way, in order to improve workability in a narrow space, a turning work vehicle is equipped with a so-called swing function in which not only the work machine rotates in the vertical direction but also the base end portion of the work machine rotates horizontally. In some cases. In a turning work vehicle having a swing function, a hydraulic swing cylinder is arranged on the turning frame. In the swing cylinder, the cylinder tube is pivotally connected to the swivel frame, the cylinder rod is pivotally coupled to the base end portion of the working machine, and the swing cylinder rotates horizontally with respect to the swivel frame due to the expansion and contraction of the cylinder rod.

The hydraulic hose wiring structure described in Patent Document 1 is suitable for allocating a hydraulic hose connected to a boom cylinder, an arm cylinder, etc. installed above, but it is suitable for a swing cylinder installed below. Not suitable for arranging connecting hydraulic hoses.

Further, in Patent Document 2, since the hole diameter of the through hole formed in the grommet is designed so as not to form a gap according to the route to be inserted, the arrangement slides through the through hole of the grommet. Is difficult. Therefore, the hydraulic hose inserted through the through hole of the grommet cannot follow the actuator that rotates with respect to the swivel frame like the swing cylinder.

Japanese Patent No. 3377198 Japanese Unexamined Patent Publication No. 2013-87423

The present invention has been made in view of the above circumstances, and an object thereof is a turning work vehicle having a swing function, and a hydraulic hose connected to the swing cylinder can follow the shaking of the swing cylinder. It is to provide a turning work vehicle.

The turning work vehicle of the present invention includes a lower traveling body and a lower traveling body.
An upper swivel body provided so as to be swivelable above the lower traveling body, and an upper swivel body.
The swivel frame constituting the bottom of the upper swivel body and
A rocking body rotatably supported at the front of the swivel frame,
A working machine supported by the rocking body so as to be rotatable up and down,
The first vertical plate and the second vertical plate, which are located on the bottom plate of the swivel frame at intervals to the left and right and are erected so as to extend in the front-rear direction,
A hydraulic swing cylinder provided on the opposite side of the first vertical plate across the second vertical plate and connecting the swivel frame and the rocking body, and a hydraulic swing cylinder.
A projecting piece projecting from the side wall of the second vertical plate above the swing cylinder toward the swing cylinder, and
With the hose guide provided on the protrusion,
It includes a hydraulic hose that passes above the first vertical plate and the second vertical plate, passes through the hose guide from above to below, and reaches the swing cylinder.

In the turning work vehicle of the present invention, the hose guide has a notch formed in the protrusion to house the hydraulic hose, and a closing member for closing the open end of the notch. But it may be.

Further, in the turning work vehicle of the present invention, the hydraulic oil tanks arranged on the left and right outer sides of the second vertical plate and
A bracket for fixing the lower part of the hydraulic oil tank to the protrusion,
It may be provided with a notch formed at a position corresponding to the hose guide of the bracket.

According to the present invention, since the hose guide is provided on the projecting piece protruding from the side wall of the upper part of the second vertical plate adjacent to the swing cylinder, a plurality of hydraulic hoses leading to the swing cylinder are gathered near the swing cylinder. And again, multiple hydraulic hoses can be distributed. As a result, when the swing cylinder swings due to the 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 the swivel frame Floor plan of swivel frame Enlarged perspective view of the hose guide An exploded perspective view of the swivel frame and hydraulic oil tank Enlarged perspective view of the mounting location of the hydraulic oil tank

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

[Overview of turning work vehicle]
As shown in FIG. 1, the turning work vehicle 1 is horizontally rotatably supported by a lower traveling body 2, an upper turning body 3 provided so as to be able to turn above the lower traveling body 2, and an upper turning body 3. A boom bracket 4 which is a swinging body and a working machine 5 supported by the boom bracket 4 so as to be vertically rotatable are provided. The turning work vehicle 1 is configured as a shovel (backhoe) with a boom swing function. Generally, the boom swing function is installed in a mini excavator that requires workability in a narrow space.

The lower traveling body 2 is driven by receiving power from the engine 60 to drive or turn the turning work vehicle 1. The lower traveling body 2 includes a pair of left and right crawlers 21 and 21 and a pair of left and right traveling motors 22 and 22 for driving 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 tips thereof, and a blade cylinder for rotating the blade 24 up and down. 25 is provided.

The upper swivel body 3 is configured to be able to swivel around an axis extending in the vertical direction at the center thereof. The upper swivel body 3 is provided with an engine 60, a swivel motor 61, a control unit 62, and the like. The control unit 62 is equipped with a driver's seat, an operation device, and the like.

The boom bracket 4 is attached to the front end portion of the upper swing body 3 via the attachment portion 35. The boom bracket 4 is supported by the mounting portion 35 so as to be horizontally rotatable (that is, swingable to the left and right). A swing cylinder 41 (see FIGS. 2 and 3) that expands and contracts in the front-rear direction is provided between the upper swing body 3 and the boom bracket 4. The horizontal rotation of the boom bracket 4 operates according to the expansion and contraction of the swing cylinder 41.

The work machine 5 is driven by receiving power from the engine 60, and excavates earth and sand according to the operation of the control unit 62. The working machine 5 is supported by the boom bracket 4 so as to be rotatable up and down. The boom bracket 4 is provided with a pivot pin 54 whose axis is directed in the horizontal direction. The base end portion of the working machine 5 (the base end portion of the boom 51 described later) is supported so as to be rotatable up and down around the pivot pin 54. Further, the working machine 5 can perform a swing operation in conjunction with the horizontal rotation of the boom bracket 4.

The working 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 rotatable up and down. The boom 51 extends in the vertical direction from the base end portion supported by the boom bracket 4, and is bent in a boomerang shape in a side view. A boom cylinder 51a that can be expanded and contracted is provided between the boom bracket 4 and the middle portion of the boom 51. The vertical rotation of the boom 51 with respect to the boom bracket 4 operates according to the expansion and contraction of the boom cylinder 51a.

The arm 52 is attached to the boom 51 so as to be rotatable up and down. At the tip of the boom 51, a pivot pin 55 whose axis is directed in the horizontal direction is provided. The base end portion of the arm 52 is supported so as to be freely rotated up and down (rotated back and forth) about the pivot pin 55. An arm cylinder 52a that can be expanded and contracted is provided between the middle portion of the boom 51 and the base end portion of the arm 52. The vertical rotation of the arm 52 with respect to the boom 51 operates according to the expansion and contraction of the arm cylinder 52a.

The bucket 53 is attached to the arm 52 so as to be rotatable up and down. At the tip of the arm 52, a pivot pin 56 whose axis is directed in the horizontal direction is provided. The base end portion of the bucket 53 is supported so as to be freely rotated up and down (rotated back and forth) about the pivot pin 56. 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 a driving force to the bucket 53. A bucket cylinder 53a that can be expanded and contracted is provided between the bucket link 57 and the base end portion of the arm 52. The vertical rotation of the bucket 53 with respect to the arm 52 operates according to the expansion and contraction of the bucket cylinder 53a.

In the upper swivel body 3, an engine 60, a battery, a fuel tank, and the like are placed on a swivel frame 30, these are covered with a bonnet 66, and a control unit 62 is arranged in front of the engine 60, a battery, a fuel tank, and the like. A hydraulic pump 63 is connected to the engine 60, and the hydraulic pump 63 is driven by the engine 60 to discharge hydraulic oil. The hydraulic oil discharged from the hydraulic pump 63 is passed through a hydraulic hose, a control unit 64, etc., which will be described later, via a swing cylinder 41, a boom cylinder 51a, an arm cylinder 52a, a bucket cylinder 53a, a blade cylinder 25, and traveling motors 22, 22. It is supplied to the swivel motor 61 and the like.

The swivel frame 30 includes a flat plate-shaped bottom plate 31, a first vertical plate 32, and a second vertical plate 33. Further, the swivel frame 30 is provided with an upper plate 34 above the bottom plate 31 to which the front end of the control portion 62 is fixed. The upper plate 34 is fixed to the upper ends of a pair of front columns 34a, 34a erected at the front end of the bottom plate 31.

The bottom plate 31 has a circular shape whose front end is cut off in the left-right direction in a plan view. The first vertical plate 32 and the second vertical plate 33 are located on the bottom plate 31 at intervals on the left and right, and are erected so as to extend in the front-rear direction. The first vertical plate 32 is arranged on the left side of the left and right center of the swivel frame 30, and the second vertical plate 33 is arranged on the right side of the left and right center of the swivel frame 30. The bottom plate 31 between the first vertical plate 32 and the second vertical plate 33 is provided with a joint opening 31a for inserting a swivel joint and a motor opening 31b for attaching a swivel motor 61. Further, the bottom plate 31 is formed with a plurality of other openings for drainage and maintenance.

The lower edge of the first vertical plate 32 and the second vertical plate 33 is welded to the upper surface of the bottom plate 31. The front end portion 32a of the first vertical plate 32 and the front end portion 33a of the second vertical plate 33 project forward from the bottom plate 31 and form a part of the mounting portion 35. Further, the rear end portion 32b of the first vertical plate 32 is connected to the third vertical plate 36 via the connecting portion 36a. The third vertical plate 36 is erected so as to extend in the front-rear direction from the vicinity of the center portion of the bottom plate 31 to the rear end portion. The second vertical plate 33 extends to the rear end portion of the bottom plate 31.

At the front end of the swivel frame 30, a mounting portion 35 to which the boom bracket 4 is mounted is provided so as to project forward. The mounting portion 35 has a tapered shape in a plan view, and an insertion hole 35a for inserting a pivot pin (not shown) is opened in the vertical direction at the front end portion thereof. The mounting portion 35 includes a pair of upper and lower stays 351 and 352 arranged at intervals from each other. The upper stay 351 is attached to the upper plate 34 so as to project forward. The lower stay 352 is attached to the upper surface of the front portion of the bottom plate 31, and projects forward from the front end portion of the bottom plate 31. The pair of stays 351 and 352 sandwich the front end portion 32a of the first vertical plate 32 and the front end portion 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 is a control valve that controls the operation of the hydraulic cylinders (swing cylinder 41, boom cylinder 51a, arm cylinder 52a, bucket cylinder 53a, blade cylinder 25) and hydraulic motors (travel motors 22, 22, swivel 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 along the front-rear direction on the right side of the second vertical plate 33. In the swing cylinder 41, the cylinder tube 41a is rotatably supported by the cylinder mounting portion 37 formed on the swivel frame 30, and the 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. Along with this, the swing cylinder 41 swings left and right around the cylinder mounting portion 37.

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

The protrusion 38 is provided with a hose guide 39. The 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, pass through 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 a plan view (see FIG. 3), the first hydraulic hose reaching the cylinder tube 41a side near the swing cylinder 41. The second hydraulic hoses 41d leading to the cylinder rod 41b side can be integrated with the 41c, 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. Further, since it is not necessary to form a hole or the like for passing the hydraulic hose in the first vertical plate 32 and the second vertical plate 33 by providing the hose guide 39 in the projecting piece 38, the first vertical plate 32 and the second vertical plate 32 and the second vertical plate 33 do not need to be formed. 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 notch 38a formed in a notch at the tip of the protrusion 38, and a closing member 39a that closes the open end of the notch 38a. The recessed portion 38a is notched in a substantially U shape, and can accommodate the first and second hydraulic hoses 41c and 41d. The recessed portion 38a is formed so as to be slidable by the first and second hydraulic hoses 41c and 41d.

The closing member 39a is a metal round bar formed into a substantially U shape, and both ends of the closing member 39a are fixed to the openings of the recessed portions 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 detaching from the recess 38a. Since the closing member 39a is formed of a round bar, it is not easily damaged even if the first and second hydraulic hoses 41c and 41d come into contact with each other and slide.

As shown in FIG. 5, a hydraulic oil tank 65 is arranged on the right side of the second vertical plate 33. The hydraulic oil tank 65 stores the hydraulic oil of 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 swivel frame 30 in the front-rear direction. The lower end 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 portion 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 projecting piece 38 via the bracket 651. One end of the bracket 651 is fixed to the recess 65a, and the other end extends beyond the left end of the hydraulic oil tank 65.

At the left end portion of the bracket 651, a notch portion 651a formed as a substantially U-shaped notch is provided. The notch 651a is provided at a position corresponding to the hose guide 39, that is, a position corresponding to the notch 38a of the protrusion 38 when the bracket 651 is fixed to the protrusion 38 with a bolt 652. As a result, 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 by the hose guide 39, so that the space in the bonnet 66 can be effectively utilized. Further, since 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, the first and second hydraulic hoses 41c and 41d Even if the hydraulic oil tank 65 is installed in the vicinity of the hose, it is easy to assemble other parts after the hose is attached.

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

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

Claims (6)

With the lower running body,
An upper swivel body provided so as to be swivelable above the lower traveling body, and an upper swivel body.
The swivel frame constituting the bottom of the upper swivel body and
A rocking body rotatably supported at the front of the swivel frame,
A working machine supported by the rocking body so as to be rotatable up and down,
A swivel work vehicle including a hydraulic swing cylinder that connects the swivel frame and the rocking body and supplies oil from a hydraulic pump via a control unit.
A turning work vehicle in which a hydraulic hose from the control unit to the swing cylinder is guided by a hose guide arranged above the swing cylinder. The hydraulic hose is composed of a first hydraulic hose extending from the control unit to the cylinder tube side of the swing cylinder and a second hydraulic hose extending from the control unit to the cylinder rod side of the swing cylinder, and the hose guide is the first. The turning work vehicle according to claim 1, which guides the hydraulic hose and the second hydraulic hose. The turning work vehicle is provided with a first vertical plate and a second vertical plate which are located on the bottom plate of the turning frame at intervals to the left and right and are erected so as to extend in the front-rear direction.
The turning work vehicle according to claim 2, wherein the first hose and the second hose are arranged above the first vertical plate and the second vertical plate. The turning work vehicle according to any one of claims 1 to 3, wherein the hose guide is provided on the side wall of the second vertical plate. The turning work vehicle according to claim 4, wherein the hose guide is installed on a protrusion of the second vertical plate. The turning work vehicle according to claim 5, wherein the hose guide is composed of a closing member.

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