JP4484573B2 - Swivel work machine - Google Patents

Description

  The present invention relates to a turning work machine such as a backhoe.

Conventionally, in this type of swivel work machine, a swivel base is provided on a traveling device so as to be rotatable about a swivel axis X, and an engine, a radiator, a hydraulic pump, In general, a fuel tank, a hydraulic oil tank, a swing motor, a control valve, and the like are mounted, and these are covered with a bonnet, a protector, a counterweight, and the like.
For example, in the backhoe of Patent Document 1, the engine is disposed horizontally on a turning board, the upper part of the engine device is covered with a bonnet, and the side part and the rear part are bolted to a plurality of ribs and stays extending from the turning board. The side protector, which is covered with a pair of fastened left and right side protectors and a rear protector and located on the outer side of the radiator disposed on the left and right sides of the engine, has a plurality of armored structures at positions facing the radiator. An exhaust window has been established.
Japanese Patent Laid-Open No. 11-172720

By the way, in turning work machines such as backhoes, there are many opportunities for maintenance / inspection of radiators and air cleaners that are engines and engine accessories, and in particular, the frequency of maintenance / inspection occasions around the radiator is high.
However, in the backhoe of Patent Document 1, the side protector is bolted to the outside of the radiator. Therefore, when the radiator is to be maintained and inspected, the bolt must be released and the side protector must be removed. Therefore, there is a problem that maintenance and inspection work becomes complicated. Further, the plurality of exhaust windows are small in size, and there is a problem that sufficient air cannot be passed through the radiator.

  Accordingly, in view of the above problems, an object of the present invention is to provide a turning work machine that can easily perform maintenance and inspection of a radiator without removing a side protector and can allow sufficient air to pass through the radiator. It is a thing.

The technical means of the present invention for solving this technical problem includes an engine 41 and a radiator 42 disposed sideways at the rear of the swivel base 12 and counterweights located behind the engine 41 and the radiator 42. 60, and a turning work machine having a bonnet 50 that covers the engine 41 and the radiator 42 above the counterweight 60,
The counterweight 60 has a rear weight 61 in the central portion in the left-right direction and a pair of left and right side weights 62L and 62R disposed on the left and right outer sides of the rear weight 61.
These left and right side weights 62L and 62R are cast by weight main bodies 66L and 66R having outer surfaces connected to the rear weight 61 and side protectors 67L and 67R protruding upward from the weight main bodies 66L and 66R. Integrally formed,
The bonnet 50 includes a rear bonnet 51 disposed on the counterweight 60 and a side bonnet 52 disposed in front of the rear bonnet 51 and on the left and right sides of the swivel base 12. And
The side protector 67R outside the radiator 42 is disposed between the rear bonnet 51 and the side bonnet 52 and surrounded by an opening 68R, and a porous lid that opens and closes the opening 68R. It has a body 71.
Further, according to another technical means of the present invention, the rear bonnet 51 is openable and closable, and the lateral width is formed wider than the lateral width of the rear weight 61,
The left and right side weights 62 </ b> L and 62 </ b> R are such that the weight main bodies 66 </ b> L and 66 </ b> R extend below the side of the rear bonnet 51.
Further, according to another technical means of the present invention, the swivel base 12 is supported so as to be pivotable about the pivot axis X, and both side edges of the rear bonnet 51 and the rear weight 61 are substantially parallel to the pivot axis X in a rear view. It is in the point which is formed in.
Another technical means of the present invention is that the engine 41 and the radiator 42 are disposed laterally at the rear part of the swivel base 12 and these are covered with the bonnet 50, and the counterweight is disposed at the rear part of the swivel base 12. 60, and side protectors 67L and 67R projecting upward on both sides of the counterweight 60, respectively,
The side protector 67R on the outer side of the radiator 42 is formed with an opening 68R communicating with the inside and the outside, and a porous lid 71 is attached to the opening 68R so as to be freely opened and closed.

Further, another technical means of the present invention is that the side protector 67R has an outer surface formed in a three-dimensional curved shape, and the lid 71 is formed in a flat plate shape.
Furthermore, another technical means of the present invention is that the upper end surfaces of the pair of side protectors 67L and 67R are set substantially flush with the upper surface of the bonnet 50.

According to the present invention, since the radiator 42 can be faced through the opening 68R by opening the lid 71 that closes the opening 68R of the side protector 67R, the maintenance and repair of the radiator 42 can be performed without removing the side protector 67R. Inspection work can be easily performed.
Further, the opening 68R is formed in a size that allows inspection and maintenance work of the radiator 42 without removing the side protector 67R, and the lid 71 that closes the opening 68R is porous. Even when the lid 71 is closed, sufficient air can be inserted into the radiator 42 through the opening 68R.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
In FIG. 6, reference numeral 1 denotes a backhoe exemplified as a turning work machine. The backhoe 1 includes a lower traveling device 2 and an upper turning body 3.
The traveling device 2 includes a pair of left and right traveling bodies 4 each having a rubber cover, and a crawler traveling device in which both traveling bodies 4 are driven by a traveling motor M is employed. Further, a dozer 5 is provided at the front portion of the traveling device 2.
The swivel body 3 includes a swivel base 12 supported on the traveling device 2 via a swivel bearing 11 so as to be capable of swiveling left and right around a swivel axis X in the vertical direction, and a working device ( Drilling device) 13. On the swivel base 12, a cabin 14 forming an operator cab is mounted.

  As shown in FIG. 1 or FIG. 6, the working device 13 swings left and right around a vertical axis on a support bracket 16 provided at the front of the swivel base 12 and offset slightly to the right from the center in the left-right direction. A swing bracket 17 that is freely supported, a boom 18 that is pivotally attached to the swing bracket 17 so as to be pivotable about a left-right axis, and is supported so as to be swingable up and down, and a tip of the boom 18 The arm 19 is pivotally attached to the side so as to be pivotable about a horizontal axis, and is supported so as to be able to swing back and forth, and a bucket 20 provided on the tip side of the arm 19 so as to be capable of squeeze dumping. ing.

  The swing bracket 17 is swung by expansion and contraction of the swing cylinder 21 provided in the swivel base 12, and the boom 18 is swung by expansion and contraction of the boom cylinder 22 interposed between the boom 18 and the swing bracket 17. The arm 19 is swung by the expansion and contraction of the arm cylinder 23 interposed between the arm 19 and the boom 18, and the bucket 20 is a bucket cylinder interposed between the bucket 20 and the arm 19. A squeeze / dump operation is performed by the expansion / contraction of 24, and these swing cylinder 21, boom cylinder 22, arm cylinder 23, and bucket cylinder 24 are constituted by hydraulic cylinders (hydraulic equipment).

The arm 19 is provided with a hydraulic pressure take-out portion (not shown) for operating a hydraulic attachment attached instead of the bucket 20.
As shown in FIGS. 1 and 4, the swivel base 12 has a swivel board 26 made of a thick plate connected to the swivel bearing 11. ) 15 is disposed, and the sheet 15 is covered with the cabin 14. The cabin 14 is formed in a box shape with an open lower end, and has a notch portion 14a cut out from the lower end to the central portion in the up-down direction at the rear portion, and the notch portion 14a is supported later. The frame 30 and the counterweight 60 (left side weight 62R) are arranged on the turning substrate 26 in a state of being fitted.

On the swivel board 26, a pair of left and right plate-like vertical ribs 27L and 27R that reinforce the central portion of the swivel board 26 in the front-rear direction are fixed by welding or the like, and other reinforcing members and various devices are attached. Brackets, stays, and the like are fixed by welding or the like, and a turning frame is constituted by these.
As shown in FIG. 4, the pair of left and right vertical ribs 27L, 27R are formed such that the front end side is formed high in the vertical direction and the rear side is formed low in the vertical direction, and the vertical rib 27L on the cabin 14 side (left side) is As shown in FIG. 1, the front side is disposed inward in the left-right direction with respect to the cabin 14, and the rear side is tilted outward in the left-right direction and disposed below the cabin 14.

A partition plate 28 extending in the left-right direction of the swivel board 26 is provided in the middle of the swivel board 26 in the front-rear direction. The vertical ribs 27L are arranged so that their rear ends are in contact with or close to the partition plate 28. Yes.
The vertical rib 27R on the opposite side (right side) of the cabin 14 has a front side disposed on the right side of the vertical rib 27L and a rear side inclined outward in the left-right direction so that the vicinity of the right end of the partition plate 28 It passes and extends to the rear of the swivel board 26. In addition, the rear end portion of the vertical rib 27R protrudes rearward from the partition plate 28 and bends and extends outward in the left-right direction to constitute a partition portion 29 continuous with the partition plate 28.

As shown in FIG. 4, the front end of the swing cylinder 21 is connected to the swing bracket 17, the rear end of the swing cylinder 21 protrudes rearward from the partition plate 28, and the partition portion of the right vertical rib 27R. 29 etc.
The support bracket 16 is fixed by welding or the like between the front end portions of the left and right vertical ribs 27 </ b> L and 27 </ b> R, and protrudes forward from the front surface of the swivel base 12.
As shown in FIGS. 1 and 3, an engine 41 is disposed horizontally on the rear portion of the turning board 26, and a radiator 42 is disposed on one side of the engine 41 (right side in the left-right direction). Hydraulic pumps 43 are disposed on the left and right other side portions (left and right direction left side), respectively.

As shown in FIGS. 1 and 4, a hydraulic oil tank 44 that stores hydraulic oil is disposed in front of the radiator 42, and a fuel that stores fuel for the engine 41 is positioned in front of the hydraulic oil tank 44. A tank 45 is disposed, and a control valve 46 is disposed above the fuel tank 45.
The engine 41, the radiator 42, the hydraulic pump 43, the hydraulic oil tank 44, the fuel tank 45, the control valve 46, and the like include a bonnet 50 that covers the swivel base frame from the right side to the rear from above, and the swivel board 26. It is arranged at both rear and rear portions to constitute the rear portion of the swivel base 12 and is covered with a counterweight 60 that adjusts the weight balance with the working device 13, thereby traveling on the backhoe 1 (forward, reverse). When the engine 41, the radiator 42, the hydraulic pump 43, the hydraulic oil tank 44, the fuel tank 45, the control valve 46, etc. collide with or come into contact with an obstacle (wall, implantation, etc.) In addition to protecting the engine 41 from being dissipated to the outside. Is the hot environment of the operating system is prevented from deteriorating.

In addition, a support frame 30 is disposed on the swivel base 12 so as to straddle the engine 41 and the like in the left-right direction. It is comprised from the flat-shaped horizontal member 32 with which both ends were connected, and the lower end of each leg part 31L and 31R is attached and fixed to the turning board 26 grade | etc.,.
The bonnet 50 is formed by sheet metal processing, resin molding, or the like. As shown in FIG. 1, the rear bonnet 51 that covers the engine 41, the radiator 42, the hydraulic pump 43, the rear part of the hydraulic oil tank 44, and the like, and the hydraulic oil tank 44. The side bonnet 52 that covers the front part of the fuel tank 45, the control valve 46, and the like is formed separately. The rear bonnet 51 is disposed at the rear part on the turning board 26, and the side bonnet 52 is placed on the turning board 26. Located on the right side.

Further, for example, the front side of the side bonnet 52 is pivotably supported in the front-rear direction. By opening the side bonnet 52, the hydraulic oil tank 44, the fuel tank 45, the control valve 46, etc. are inspected. Maintenance is possible.
In addition, the side part bonnet 52 may be attached to the swivel base 12 so that attachment or detachment is possible, and you may pivot so that the rear part of the side part bonnet 52 can be rotated in the front-back direction.
The rear bonnet 51 is supported at the front end of the upper wall by the horizontal member 32 of the support frame 30 so as to be pivotable around a horizontal axis, and can be opened and closed in the vertical direction as indicated by arrows in FIG. The rear bonnet 51 and the counterweight 60 can be unlocked by a locking means 77 disposed on the upper side of the center in the left-right direction of the swivel base shown in FIG.

The locking means 77 includes a locking piece 78 disposed in the center portion in the left-right direction of the rear bonnet 51 and an L-shaped locked piece 79 disposed in the vicinity of the upper end portion in the center portion in the left-right direction of the counterweight 60. The lock piece 78 is pivotally supported around a rotation axis that is perpendicular or substantially perpendicular to the pivot axis of the rear bonnet 51 that is pivotally supported to be openable and closable, and the lock piece 78 is fixed. A lock mechanism 80 for switching the rotatable state is provided on the rotation shaft.
By injecting a key (engine key or the like) into the key hole 81 of the lock mechanism 80 and rotating the lock piece 78 together with the key, the lock piece 78 becomes detachable with respect to the locked piece 79 and locks. In the released state, the rear bonnet 51 is opened as shown by a two-dot chain line in FIG. 4 so that inspection and maintenance in the vicinity of the upper portion of the engine 41 can be performed.

Further, an elastic rim body such as an elastic tube or an elastic U-shaped tube is attached to both side edges and the rear edge of the rear bonnet 51 which are opposed to the edge of the counterweight 60 by closing the rear bonnet 51. As a result, a seal is applied to the joint (butt gap) between the rear bonnet 51 and the counterweight 60 in the closed state.
As shown in FIGS. 1, 3, and 4, the counterweight 60 has an overall outer shape that is curved outwardly, and the counterweight 60 may be formed by integrally molding the left and right side portions and the entire central portion. In this way, the rear weight 61 in the central portion in the left-right direction and the pair of left and right side weights 62L, 62R are divided and formed, and thus the counterweight 60 is formed in a divided manner, which is easier than the one integrally formed. Can be cast into.

The rear weight 61 is made of a casting made of a metal such as steel or lead. As shown in FIG. 4, a bulging portion 63 that bulges behind the revolving body 3 from the rear bonnet 51, and the bulging portion 63. The extending portion 64 extends from below toward the swivel substrate 26, and the horizontal portion 65 extends horizontally from the distal end portion of the extending portion 64 and is connected to the swivel substrate 26 and constitutes the lower surface of the rear weight 61. It is formed in a three-dimensional shape.
As shown in FIG. 3, the upper edge of the bulging portion 63 of the rear weight 61 extends along the upper surface of the rear bonnet 51 and the rear edge of the rear bonnet 51 that extends substantially parallel to the swivel substrate 26.

Further, both side edges of the rear bonnet 51 and both side edges of the rear weight 61 are formed substantially parallel to the pivot axis X in a rear view, and a counterweight 60 is provided on the left side of the rear bonnet 51 and the rear weight 61. The left side weight 62L is disposed on the outer side of the hydraulic pump 43 and the right side of the counterweight 60 is formed on the right side of the rear bonnet 51 and the rear weight 61. A right side weight 62R located on the outer side of the radiator 42 is disposed.
The side weight 62L located on the left side of the rear weight 61 is made of a casting made of a metal such as steel or lead, and has a curved shape connected to the bulging portion 63, the extending portion 64, and the horizontal portion 65 of the rear weight 61. The weight main body 66L having an outer surface and a side protector 67L extending in a curved shape from the front upper side of the weight main body 66L toward the upper surface of the rear bonnet 51 are formed in a three-dimensional shape.

The side protector 67L protrudes from the position slightly inside the outer surface of the weight main body 66L toward the upper side of the weight main body 66L, and the upper end surface of the side protector 67L is substantially the same as the upper surface of the rear bonnet 51. It is set to be flush. As shown in FIG. 1, the left side edge of the side protector 67 </ b> L extends along the side surface of the mounting recess 14 a of the cabin 14, and the right side edge extends along the left side edge of the rear bonnet 51.
In addition, an opening 68L that communicates the inside and the outside is formed at a position facing the hydraulic pump 43 at the center of the side protector 67L, and the opening 68L is formed of a mesh metal mesh, punching metal, or the like. A porous cover body 69 is bolted through a sealing material.

The side weight 62R located on the right side of the rear weight 61 is made of a casting made of a metal such as steel or lead. As shown in FIGS. 3 and 4, the bulging portion 63, the extending portion 64, and the horizontal portion of the rear weight 61 are provided. A three-dimensional shape comprising a weight main body 66R having a curved outer surface connected to the portion 65, and a side protector 67R extending in a curved shape from the front upper side of the weight main body 66R toward the upper end surface of the rear bonnet 51. Is formed.
The side protector 67R protrudes from the position slightly inside the outer surface of the weight main body 66R toward the upper side of the weight main body 66R, and the upper end surface of the side protector 67R is substantially the same as the upper surface of the rear bonnet 51. The right edge of the side protector 67R extends along the rear edge of the side bonnet 52, and the left edge extends along the right edge of the rear bonnet 51.

As shown in FIGS. 2 and 5A, the right side protector 67R is formed with an opening 68R that communicates the inside and the outside, facing the heat radiating surface of the radiator 42. The opening 68R is widely opened from the upper end to the center in the vertical direction of the side protector 67R, and from the left to the right in the left-right direction, and below the opening 68R, Similarly, a through hole 70 that communicates inside and outside is formed.
A lid 71 that covers the opening 68R together with the through hole 70 is attached to the side protector 67R via a pair of upper and lower hinges 72 so as to be opened and closed. The lid 71 is housed in a housing recess 73 formed by connecting the opening 68R and the opening edge outside the through-hole 70 in a closed state, while being removed from the housing recess 73 in an open state. The opening 68R and the through hole 70 are opened, and the radiator 42, the piping under the radiator 42, and the like can be exposed from the outside through the opening 68R and the through hole 70.

Further, the lid 71 is formed in a flat plate shape that is substantially flush with the opening edge of the housing recess 73 and the periphery thereof with the outer surface thereof closed by metal press processing, sheet metal processing, or the like. In the center of the lid 71, a window portion 74 that communicates with the inside and the outside is provided in a position that is opposed to the opening portion 68R in a closed state, and is formed in substantially the same shape as the opening portion 68R. A porous cover body 75 formed of mesh wire mesh, punching metal, or the like is bolted to 74 via a sealing material.
In the embodiment of the present invention, when the inspection and maintenance of the radiator 42 and the piping below the radiator 42 are performed, a lid 71 attached to the right side protector 67R so as to be freely opened and closed as shown by a two-dot chain line in FIG. Is opened, the opening 68R and the through hole 70 covered by the lid 71 are exposed, and thereby, the heat radiation surface of the radiator 42 and the lower side of the radiator 42 are exposed through the opening 68R and the through hole 70. Piping and the like can be faced, and the operator can perform inspection and maintenance work on the heat radiating surface and piping with the lid 71 opened. Therefore, it is not necessary to remove the protector for the inspection and maintenance of the radiator as in the conventional case, and the inspection and maintenance work can be easily performed.

Further, since the opening 68R is formed in a size that allows the internal radiator 42 to be inspected and maintained from the outside of the swivel base 12, the bonnet 50 and the counter are countered by starting the fan of the radiator 42. An exhaust air (air flow) as shown by a broken line arrow in FIG. 3 is formed in the arrangement space of the engine 41 covered with the weight 60, and sufficient air is inserted into the arrangement space through the opening 68R. As a result, a required amount of ventilation in the arrangement space is ensured.
Here, the lid body 71 is provided with a window portion 74 having substantially the same shape as the opening portion 68R on the surface facing the opening portion 68R, and a porous cover body 75 is attached to the window portion 74. Even when the lid 71 is in the closed state, sufficient air is inserted through the window 74 and the opening 68R into the heat radiation surface of the radiator 42.

  Further, the pair of left and right side protectors 67L and 67R are formed into a curved three-dimensional shape integrally with the weight main bodies 66L and 66R by casting, while the lid 71 is made of metal as shown in FIG. It is formed in a flat plate shape by press working or the like. When the lid 71 is accommodated in the accommodation recess 73 and closed, the outer surface of the lid 71 and the opening edge of the accommodation recess 73 and the periphery thereof are substantially flush with each other. Even in the closed state, as shown in FIG. 5B, the side surface of the swivel base 12 is formed by the lid 71 without a sense of incongruity. Therefore, it is not necessary to form the lid 71 in a curved shape in accordance with the shape of the side protector 67R, and the cost for press-molding the lid 71 into the curved shape is reduced.

  Further, the pair of left and right side protectors 67L and 67R protrude from the front upper portions of the weight main bodies 66L and 66R to the upper side of the weight main bodies 66L and 66R, respectively. The side part is constituted, and the rear bonnet 51 covers the upper side of the engine 41 and its auxiliary machines (the radiator 42, the hydraulic pump 43, etc.). For this reason, even when an obstacle collides with or comes into contact with the turntable 12 from the rear upper side of the turntable 12, the obstacle collides with or comes into contact with the side protectors 67L and 67R, and the strength against impact is small. The rear bonnet 51 is protected by the side protectors 67L and 67R.

As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited to said embodiment. For example, the side protector 67L (67R) constituting the side weight 62L (62R) is formed as a separate body from the weight main body 66L (66R), and the side protector 67L (66R) is fastened with bolts or the like to turn the substrate 26 or the weight main body. You may employ | adopt the structure attached to 66L (66R) etc. Along with this, a configuration in which the rear weight 61 and the weight main bodies 66L and 66R on the left and right sides are integrally formed can be adopted.
It is of course possible to attach the lid as described above to the side protector 67L of the left side weight 62L so that the opening 68L of the side protector 67L can be opened and closed.

Further, the backhoe 1 is made into a very small turning type in which the working device 13 is pivotally supported on the center side of the turning body 3, the turning body 3 and the equipment mounted thereon are configured in the opposite direction, and the rear bonnet 51 is arranged on the side portion. It is also possible to use a pivotal structure.
Alternatively, the driver's seat 15 can be adjusted in the front-rear position, or a driver's seat protection device having a lops and a canopy can be mounted on the back of the driver's seat 15 instead of the cabin 14 covering the driver's seat 15.

It is a top view of the swivel of the backhoe concerning embodiment of this invention. It is a principal part enlarged plan view of the turntable. It is a rear view of the turntable. It is a right view of the turntable. (A), (b) is a perspective view which shows the structure of the side part weight of the right side of the same turntable. It is a right view of the backhoe concerning embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Backhoe 2 Traveling apparatus 3 Revolving body 12 Swivel base 13 Working apparatus 14 Cabin 26 Swivel board 30 Support frame 41 Engine 42 Radiator 43 Hydraulic pump 50 Bonnet 51 Rear bonnet 52 Side bonnet 60 Counterweight 61 Rear weight 62L Side weight 62R Side Weight 66L Weight body 66R Weight body 67L Side protector 67R Side protector 68L Opening 68R Opening 70 Through hole 71 Lid 74 Window 75 Cover 77

Claims (3)

At the rear part of the swivel base (12), the engine (41) and the radiator (42) arranged sideways, a counterweight (60) located behind the engine (41) and the radiator (42), and the counter It met weight (60) upward in said engine (41) and the radiator (42) covering hood (50) and a turning work machine,
The counterweight (60) has a rear weight (61) in the center in the left-right direction, and a pair of left and right side weights (62L, 62R) arranged on the left and right outside of the rear weight (61).
Each of the left and right side weights (62L, 62R) includes a weight body (66L, 66R) having an outer surface connected to the rear weight (61), and a side projecting upward from the weight body (66L, 66R). The protector (67L, 67R) is integrally formed by casting,
The bonnet (50) is disposed on a rear bonnet (51) disposed on the counterweight (60) and on the left and right sides on the swivel base (12) in front of the rear bonnet (51). Side bonnet (52)
The side protector (67R) on the outer side of the radiator (42) is disposed between the rear bonnet (51) and the side bonnet (52) and has an opening (68R) surrounded by the periphery (68R). A swivel working machine comprising a porous lid (71) for opening and closing the opening (68R) . The rear bonnet (51) is openable and closable and has a lateral width wider than that of the rear weight (61),
The turning operation according to claim 1, wherein the left and right side weights (62L, 62R) are such that the weight main body (66L, 66R) extends below a side of the rear bonnet (51). Machine. The swivel base (12) is supported so as to be pivotable about a swivel axis (X), and both side edges of the rear bonnet (51) and the rear weight (61) are formed substantially parallel to the swivel axis (X) in a rear view. rotary working machine according to claim 1 or claim 2, characterized in that it is.

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