JPH1181375A - Slewing work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve comfortability of a worker by a method wherein a support frame is also hardly deformed in a longitudinal direction and resonance of a bonnet, a canopy, or a cabin is prevented from occurring. SOLUTION: In a slewing work machine, a revolving stand 7 is arranged on a running device around an axis in a vertical direction on a running device and a support frame 44 formed approximately in a portal type as seen from a front is erected astride an engine 21 in the rear part of the slewing stand 7. A bonnet 20 is mounted on the support frame 44. In this case, at least one of stay members 47 and 48 at the right and left end parts of a support frame 52 forms a stay frame 52 branched in a fork-form manner in a longitudinal direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turning work machine such as a backhoe.

[0002]

2. Description of the Related Art As this kind of turning work machine, a turning table is provided on a traveling device so as to be rotatable around a vertical axis.
In some cases, a support frame is provided upright at the rear of the swivel table, and a hood is attached to the support frame. Conventionally, the support frame is formed substantially in a gate shape in a front view so as to straddle the engine, supports the upper plate portion of the bonnet from below, and also functions as a support member for the canopy or the cabin. Various members in a bonnet, such as an air cleaner, are attached to the support frame via a bracket (Japanese Patent Application Laid-Open No. H08-08380).
No. 302736).

[0003]

In the conventional turning work machine, since the support frame is formed substantially in a gate shape when viewed from the front, the support frame hardly deforms when subjected to a load in the left-right direction. Since the support member for supporting the portion is formed of a simple single column, it is relatively easily deformed by a load in the front-rear direction.

[0004] Therefore, the hood, canopy or cabin connected to the upper part of the support frame tends to resonate in response to the vibration of the engine, the hydraulic pump or the like, so that the livability of the worker may be deteriorated. In view of such circumstances, an object of the present invention is to improve the livability of a worker by preventing the resonance of a hood, a canopy or a cabin by making the support frame difficult to deform in the front-rear direction.

[0005]

In order to achieve the above object,
The present invention has taken the following technical measures. That is, the present invention provides a support frame in which a swivel is provided on a traveling device so as to be rotatable about an axis in a vertical direction, and a rear gate is formed substantially in a gate shape in a front view so as to straddle an engine at a rear portion of the swivel. In the turning work machine in which the hood is attached to the support frame, at least one of the support members at the left and right ends of the support frame is formed of a support frame that is bifurcated forward and backward.

[0006] In this case, the support member is formed of a support frame that is bifurcated in the front and rear directions, and the support frame is difficult to be deformed in the front and rear direction. Resonance in response to such vibrations is prevented or suppressed as much as possible. On the other hand, in order to more effectively prevent the deformation of the support frame in the front-rear direction, it is preferable to make the front-rear space between the forks of the support frame as wide as possible. In the revolving-type revolving work machine, the space behind the revolving base is naturally restricted, so that if the fore-and-aft distance between the forks of the support frame is made too wide, the frame will protrude outside from the rear side surface of the hood.

In view of the above, the present invention provides a support frame having a rear portion which is bent inward in the left-right direction along the rear surface of the bonnet so as to reduce the distance between the forks of the support frame even when the rear space of the turntable is limited. Try to be as wide as possible. In addition, in the case of a support frame in which the fore-and-aft distance between the forks is widened as described above, if the support frame is disposed so as to cover the heat exchanger provided in the bonnet from above, the support frame will be a protector for the heat exchanger. And effectively protects the heat exchanger when an obstacle collides with the bonnet.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. The drawing shows a small turning backhoe 1 exemplified as a turning work machine. In FIG. 1, the backhoe 1 is mainly composed of a traveling device 2, a revolving unit 3, and an excavating device 4.

Hereinafter, the traveling direction of the backhoe 1 (the left-right direction in FIG. 1) is referred to as the front-rear direction, and the lateral direction perpendicular to the front-rear direction (the direction penetrating the plane of FIG. 1) is referred to as the left-right direction.
As shown in FIG. 1, the traveling device 2 employs a crawler traveling device in which a pair of left and right crawler traveling members 5 having rubber crawler belts are provided, and these traveling members 5 are driven by a traveling motor M. . A dozer 6 is provided at the front of the traveling device 2.
Is provided.

The revolving unit 3 includes a revolving table 7 rotatably supported about a vertical axis of rotation by a bearing 8 provided at a central portion between the left and right crawler traveling units 5 of the traveling device 2. The hood 20 includes a hood 20 that covers various devices mounted on the base 7, and a cabin 42 that covers a seat 41 provided on the hood 20 and a control section in front of the hood 20. The revolving base 7 is configured by covering a frame formed by combining a frame material having a front part and a middle part with a plate material with a cover member, and the rear part of the revolving base 7 is fixed to the frame and the revolving base 7 is fixed.
And a counterweight 9 for balancing the weight with the excavator 4 at the front of the vehicle.

The turntable 7 is turned around a turning axis X by a turn motor 10 (see FIG. 2) supported by a frame of the turntable 7. The backhoe 1 is of a so-called small backward swing type, and is formed in an arc shape so that the rear side surface of the swing body 3 does not protrude from the vehicle width of the traveling device 2. That is, when the revolving unit 3 turns, the turning trajectory drawn by the rear surface of the revolving unit 3 falls within the left and right widths of the left and right crawler traveling units 5.

As shown in FIG. 2, the left and right side surfaces of the revolving unit 3 are formed in a plane extending in the front-rear direction with the revolving unit 3 facing forward. It is formed narrower than the diameter of the turning locus circle drawn by the rear surface. Further, in the same state, the front surface of the revolving unit 3 is formed in a plane along the left-right direction, and the left side is slightly projected forward from the right side.

As shown in FIG. 1, a pair of upper and lower support members 11 for supporting the excavator 4 project from the front right side of the swivel 7. A swing bracket 12 is pivotally attached to the support member 11 via a support shaft so as to freely swing left and right around a vertical axis. The swing bracket 12 is provided with a swing cylinder 13 provided inside the swivel 7 (see FIGS. 4 and 5). (See Reference).

The excavator 4 includes a boom 1 whose base is pivotally attached to a swing bracket 12 so as to be swingable about the left and right axes.
4, an arm 15 pivotally attached to the distal end side of the boom 14 so as to be swingable about the left and right axes, and a bucket 16 attached to the distal end side of the arm 15 so as to be free to squeeze and dump. The boom 14 is swung by a boom cylinder 17 provided between the swing bracket 12 and the middle part of the boom 14, and the arm 15 is provided with an arm cylinder 18 provided between the middle part of the boom 14 and the base of the arm 15. The bucket 16 is squeezed and dumped by the bucket cylinder 19 provided between the base of the arm 15 and the mounting link of the bucket 16.

The rear upper surface and the right upper surface of the swivel 7 are open, and these open portions are covered with a rounded bonnet 20 projecting upward from the upper surface of the swivel 7. Inside the hood 20, an engine 21 and
Hydraulic pumps 23 for driving various hydraulic devices, hydraulic equipment including a hydraulic oil tank 24 and a control valve 25, a radiator 26, and the like are housed, and these are mounted on the swivel 7. The upper surface on the right side of the swivel 7 is covered with a floor sheet, and a fuel tank 22 for the engine 21 and a battery 27 are stored in this portion.

As shown in FIG. 2 and FIG.
Is disposed laterally at the rear of the swivel 7 so that the drive axis thereof is oriented in the left-right direction. A hydraulic pump 23 is directly connected to a lower right portion of the engine 21, and a radiator fan 28 is connected to an upper left portion of the engine 21. The lower shaft that drives the hydraulic pump 23 and the upper shaft that drives the radiator fan 28 are linked by a belt transmission mechanism including a fan belt 29 and a pulley.

A silencer 30 is connected to the upper right side of the engine 21, and a reserve tank 31 for cooling water of the radiator 26 is provided behind the engine 21. In addition, a swivel joint 32 is provided at the center of rotation of the swivel 7, and the swivel motor 10 is disposed in front of and slightly to the left of the joint 32.
Each of the control valves 25 is connected by a hydraulic line 33.

On the left side of the radiator fan 28, various heat exchangers, that is, the radiator 26, the oil cooler 34, and the condenser 35 of the air conditioner are arranged in this order from the left side. Of these, the oil cooler 34 cools the return oil from the control valve 25 and
The condenser 35 is an outdoor unit of an air conditioner (air conditioner) in the cabin 42.

The bonnet 2 corresponding to these heat exchangers
An outside air intake 36 (see FIG. 1) is formed on the left side of the hood 20, and an exhaust port (not shown) is formed on the right side of the bonnet 20. Thus, the backhoe 1 of the present embodiment employs a suction type in which the radiator 26 and the radiator fan 28 are disposed immediately inside the outside air intake 36.

The hydraulic oil tank 24 and the control valve 25 are arranged on the right side of the swivel 7 (on the same side as the hydraulic pump 23) and in front of the hydraulic pump 23. That is, the hydraulic oil tank 24 and the control valve 25
Are arranged intensively on the right side of the swivel 7 together with the hydraulic pump 23, so that the hydraulic piping for connecting the main equipment (hydraulic equipment) required for the hydraulic drive to each other is made as short as possible. Main equipment can be intensively maintained and inspected.

As shown in FIGS. 2, 4 and 5, the control valve 25 is directly connected to the front side of the hydraulic oil tank 24 in a vertically oriented state, and the front end face 25A of the control valve 25 is shifted as far back as possible. In this state, the walk-through 37 formed at the front of the swivel 7 is made as wide as possible. When the control valve 25 is arranged on the front side of the hydraulic oil tank 24, the valve 25 is relatively close to the swivel joint 32 and the swing motor 10, so that the piping for these can be shortened.

In the illustrated example, the control valve 25
Is mounted on the front side surface of the hydraulic oil tank 24. The valve 25 may be provided between the hydraulic oil tank 24 and the hydraulic pump 23, further to the right of the hydraulic oil tank 24, or above the hydraulic oil tank 24. it can. These positions are preferable because the hydraulic oil tank 24 does not hinder the maintenance and inspection of the control valve 25.

The hydraulic oil tank 24 includes a hydraulic oil filter 38, an unload valve 39, and a fuel filter 40.
Are mounted in a suspended state (see FIG. 4), whereby maintenance and inspection of those members can be performed intensively, and the number of assembling steps for those members can be reduced. As shown in FIGS. 2 and 3, a support frame 44 formed substantially in a gate shape in a front view is provided upright at the rear portion of the swivel 7 so as to straddle the engine 21 in the left-right direction. The lower surface of the hood 20 and the rear support of the cabin 42 are fixed to the frame 44, and the air cleaner 4 for sending the cleaning air to the engine 21.
5 is attached.

The support frame 44 comprises a horizontal beam 46 having a hollow inside, and a pair of left and right support members 47 and 48 for supporting the left and right ends of the horizontal beam 46. The left end of the horizontal beam 46 is formed on the left side surface of the bonnet 20. At a position close to the outside air intake port 36. On the other hand, the air cleaner 45 is attached to the right side of the cross beam 46 via a bracket 49 or obliquely. This air cleaner 4
The exhaust port 5 is connected to the front side of the engine 21 via an outlet pipe 50, and the intake port of the air cleaner 45 is connected to the cross beam 46 via a bent pipe 51 bent in a square shape.

Accordingly, a part of the fresh air flowing from the outside air intake 36 reaches the right end from the left end of the cross beam 46 and is supplied to the air cleaner 45 through the curved pipe 51. As described above, since the cross beam 46 of the support frame 44 also has a function as an intake pipe of the air cleaner 45, the number of parts is reduced by that much, and the rear part of the swivel 7 is made compact. Can be.

The left and right support members 47 of the support frame 44,
48, the right column member 47 is formed of a substantially inverted L-shaped column member in a side view, and the left column member 48 is formed.
As shown in FIG. 3, a support frame 52 is formed in a substantially inverted U-shape in a side view. That is, the support frame 52 is formed in an inverted U-shape so as to be divided into two parts in the front and rear, and is less likely to be deformed in the front and rear direction than a simple rod-shaped support.

Therefore, even if the vibration from the engine 21, the radiator fan 28, the hydraulic pump 23, or the like is transmitted to the support frame 52 through the swivel 7, the cross beam 45 fixed to the upper end resonates back and forth. Bonnet 2 which is prevented and thus attached to its cross beam 45
Zero and vibration of the cabin 42 can be suppressed as low as possible.

As shown in FIG. 2, the support frame 52
The rear portion 53 is bent in a substantially U-shape in plan view along the rear side surface of the bonnet 20, so that even in the hood 20 where the position of the rear side surface is limited due to small turning, The interval between the forks of the support frame 52 is made as wide as possible. As shown in FIG. 2, the support frame 52 is disposed so as to cover the radiator 26, the oil cooler 34, and the condenser 35 from above, and also functions as a protector for protecting these heat exchangers. . In this case, if the swivel 7 is equipped with a canopy instead of the cabin 42, no air conditioner is required.
Is omitted.

In the illustrated example, the right and left support members 47, 48 are provided.
Although the case where the support frame 52 is adopted only on the left side is illustrated, the support frame 52 can be adopted only on the right support member 47, and both the left and right support members 47,
The support frame 52 can also be adopted as 48. The bonnet 18 is made of a resin or a thin steel plate, and includes a right cover 54 that covers the control valve 25, the hydraulic oil tank 24, the hydraulic pump 23, and the like, a rear cover 55 that covers the rear half of the engine 19, And a left cover portion 56 for covering a portion of the exchanger. Of these cover portions, the rear cover portion 55 is supported by a cross beam 46 of the support frame 44 via a hinge so as to be vertically rotatable, and by opening the rear cover portion 26, the engine 1
8 and its surroundings can be maintained and inspected.

In this embodiment, since all the hydraulic equipment including the hydraulic pump 23, the hydraulic oil tank 24, and the control valve 25 are concentrated on the right end side of the swivel 7 as shown in FIG. The fuel tank 22 and the battery 27 are arranged on the left end side of the swivel table 7 while the fuel tank 22 and the battery 27 are arranged at the left side of the swivel table 7. That is, the fuel tank 22 is disposed so as to lie in a relatively wide range from the left side of the swivel base 7 and below the seat 41, and includes the main tank portion 57 which is out of the plane range of the bonnet 20. By arranging the fuel tank 22 in a wide area on the opposite side to the hydraulic oil tank 24 in this manner, the left and right weight balance of the swivel 7 is effectively ensured while ensuring a large capacity of the tank 22. Like that.

Further, at the rear end of the main tank portion 57,
An extension 58 extending to the rear of the swivel 7 and away from the seat 41 is integrally connected, and a fuel filler port 59 is formed in the extension 58. For this reason, the seat 41 does not become a hindrance when refueling from the refueling port 59, and the refueling operation is facilitated. As shown in FIGS. 2 and 3, the seat 41 is housed in a concave portion 60 formed in the upper part of the front surface of the hood 20, and is disposed on the left side of the swivel 7 so as to be located above the radiator 26 and the radiator fan 28. Thus, the cool air from the outside air intake 36 always flows under the seat 41. For this reason, the heat generation from the engine 21 is prevented from being directly radiated to the seat, and the comfort in summer is prevented from being deteriorated.

The radiator 26 has a radiator fan 2 so that its center R is lower than the fan center F.
8, the recess 60 of the bonnet 20 is formed deeper than before by the eccentricity of the radiator 26. Therefore, despite the fact that the seat 41 is arranged above the radiator 26, the seat 4
1 can be installed as low as possible, thereby preventing the weight balance of the swivel 7 from being deteriorated due to the height of the height.

An extension pipe 62 extending to the rear cover 55 of the bonnet 20 is connected to the upper tank 61 of the radiator 26, and a water supply port 63 is provided at the tip of the extension pipe 62. Therefore, water can be supplied from the water supply port 63 by opening the openable rear cover 55, and the seat 41 does not interfere with the supply of water to the radiator 26.

In the present embodiment, the case where the present invention is applied to the backhoe 1 that makes a small backward turn is illustrated. However, in the present invention, the excavator 4 protrudes from the vehicle width of the traveling device 2 when the excavator 4 is at its highest position. It can also be used for the backhoe 1 that does not have a very small turning.

[0035]

As described above, according to the present invention,
The support frame to which the bonnet or cabin is connected is not easily deformed not only in the left-right direction but also in the front-rear direction, which makes it difficult for the bonnet or cabin to resonate with the vehicle vibration. Can be improved.

[Brief description of the drawings]

FIG. 1 is an overall side view of a small turning backhoe (turning machine).

FIG. 2 is a plan view showing an internal mechanism of the rotating body.

FIG. 3 is a left side view showing an internal mechanism of the rotating body.

FIG. 4 is a right side view showing an internal mechanism of the rotating body.

FIG. 5 is a front view showing an internal mechanism of the rotating body.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 small turning backhoe (turning work machine) 2 traveling device 7 turning table 20 bonnet 21 engine 26 heat exchanger (radiator) 34 heat exchanger (oil cooler) 35 heat exchanger (condenser) 44 support frame 47 support member (right side) 48 Support member (left side) 52 Support frame 53 Rear

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kazuhiko Ikeuchi 64 Ishizukita-cho, Sakai City, Osaka Prefecture Inside the Kubota Sakai Plant (72) Inventor Toshihiko Takemura 64 Ishizukita-cho, Sakai City, Osaka Prefecture Kubota Sakai Manufacturing Co., Ltd. In-house (72) Inventor Kazuomi Sugiyama 64 Ishizu-Kitacho, Sakai City, Osaka Prefecture Inside Kubota Sakai Works, Ltd.

Claims (3)

[Claims] A swivel (7) is provided on a traveling device (2) so as to be rotatable around a vertical axis, and a rear portion of the swivel (7) straddles an engine (21). In a turning work machine in which a support frame (44) formed substantially in a front view and having a bonnet (20) is mounted on the support frame (44), left and right ends of the support frame (44) are provided. Pillar members (4
7) A turning work machine characterized in that at least one of (48) comprises a support frame (52) which is bifurcated into front and rear. 2. The turning work machine according to claim 1, wherein the rear portion (53) of the support frame (52) is bent inward in the left-right direction along the rear side surface of the hood (20). 3. The support frame (52) includes a bonnet (2).
3. The turning work machine according to claim 1, wherein the turning work machine is disposed so as to cover the heat exchangers (26), (34), and (35) provided in 0) from above.