JP2005061086A - Small shovel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small shovel which enables the efficient layout of equipment and the like by eliminating a dead space on an upper structure. <P>SOLUTION: In this small shovel, the upper structure is swingably mounted on an undercarriage; a hydraulic oil tank, hydraulic equipment and the like, which are mounted on a revolving frame of the upper structure, are housed in a guard panel 5b; notches 19d and 19d' are formed in a part of a side wall of the hydraulic oil tank 19; and the hydraulic equipment 21 is arranged in such a manner as to correspond to the notches 19d and 19d'. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a small excavator that is suitable for a so-called rear small turning type that turns in a state where the rear end of the upper turning body hardly protrudes outside the width of the lower traveling body.

  Compared with a hydraulic excavator that swings in a state where the rear part of the upper swinging body protrudes outside the width of the crawler, the rear small swing type hydraulic excavator is restricted in length in the front-rear direction. Equipment needs to be laid out compactly.

  As an example of the layout of the tank and the hydraulic equipment, there is an arrangement as shown in FIG. Specifically, the cab 51 is disposed on one side of the front of the upper swing body 50, the engine 52 is disposed horizontally on the rear, and the direction control valve 54 is disposed in the front-rear direction near the guard panel 53 on the other side of the front. The fuel tank 55 and the hydraulic oil tank 56 are arranged in the front and rear between the direction control valve 54 and the cab 51 (see, for example, Patent Document 1).

In the figure, 57 and 58 are crawlers, 59 is a swing boom, 60 is a swing bracket that supports the base end of the swing boom 59, and 61 is a swing cylinder.
JP-A-8-199624 (pages (1)-(2), FIG. 2)

  The cab 51 is arranged on the left side of the fuel tank 55 and the hydraulic oil tank 56, but the space for the cab 51 tends to be narrow in a small excavator. Therefore, an attempt has been made to expand the living space by efficiently laying out the devices arranged on the upper swing body.

  For example, conventionally, a occupant space in a driver's cab has been expanded by storing a vertical fuel tank in a horizontal shape with a low height and storing the fuel tank below the cab 51. However, since it is necessary to arrange the hydraulic oil tank in the cooling air passage by the cooling fan, a drastic layout change like the fuel tank cannot be expected.

  Further, the hydraulic oil tank and the direction control valve 54 arranged alongside the hydraulic oil tank are arranged in the front-rear direction, whereas the guard panel 53 is formed in an arc shape. A dead space S is generated between the directional control valve 54 and the dead space S is a factor that prevents the devices from being laid out efficiently.

  If the hydraulic oil tank is made thinner, the living space can be expanded, but on the other hand, the tank capacity is reduced.

  The present invention has been made in view of the problems in the conventional small excavator as described above, and can eliminate the dead space on the upper swing body and efficiently lay out the equipment without reducing the tank capacity. A small excavator is provided.

  The present invention provides a compact structure in which an upper swing body is pivotably mounted on a lower traveling body, and a hydraulic oil tank, hydraulic equipment, and the like mounted on a swing frame of the upper swing body are housed in a guard panel. The excavator is a small excavator in which a notch or a recess is formed in a part of the side wall of the hydraulic oil tank, and a hydraulic device is arranged corresponding to the notch or the recess.

  In the present invention, when the side wall of the guard panel is formed in a curved line when seen from the plane, it is preferable to dispose the hydraulic device in parallel with a tangent line passing through the curved side wall of the guard panel.

  In the present invention, a driver's seat can be arranged on one side of the front part of the upper swing body, and a hydraulic oil tank can be arranged on the other side of the front part and on the side of the driver's seat.

  In the present invention, a directional control valve is provided as the hydraulic device, and the directional control valve can be fixed to the notch or the recess. In this case, the direction control valve can be arranged vertically, that is, an arrangement in which a plurality of valve bodies are arranged in the vertical direction.

  According to the small excavator of the present invention, when the hydraulic oil tank, the hydraulic equipment, and the like are arranged in the guard panel, the hydraulic equipment is arranged in the hydraulic oil tank by arranging the hydraulic equipment corresponding to the notch or the recess formed in the hydraulic oil tank. In contrast, hydraulic equipment can be placed close to each other, so even if a hydraulic oil tank or hydraulic equipment is placed in the guard panel, there is no wasted space and the hydraulic oil tank and hydraulic equipment can be laid out efficiently. Is possible. In addition, if the cutout or recess is formed without reducing the volume of the hydraulic oil tank, the tank capacity is not reduced.

  Further, according to the present invention, when the hydraulic oil tank, the hydraulic device, etc. are arranged in the guard panel whose side wall is configured by a curve, the hydraulic device is arranged in parallel with a tangent line passing through the curve of the guard panel. The hydraulic oil tank and the hydraulic equipment can be efficiently laid out in a state where no useless space is generated between the panel and the panel.

  Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings.

  FIG. 1 shows the overall configuration of a small excavator according to the present invention.

  In the figure, a small excavator 1 includes a lower traveling body 3 to which a crawler shoe 2 is attached, a dozer device 4 provided in the lower traveling body 3, and an upper swing that is rotatably mounted on the lower traveling body 3. A body 5 and a front attachment 6 provided on the front side of the upper swing body 5 are provided.

  The small excavator 1 is a so-called rear small turning excavator configured so that the turning radius of the rear part of the upper turning body 5 is within the vehicle width, and the side wall of the guard panel 5b of the upper turning body 5 is curved when viewed from the plane. It consists of

  A driver seat 5 a is provided on the left side of the front part of the upper swing body 5, and the driver seat 5 a is guarded by a canopy 7.

  The front attachment 6 has a swing boom 8 that swings in the left-right direction, and a boom support portion 8 a of the swing boom 8 is connected to a swing bracket 9 that projects forward from a main frame (not shown) of the upper swing body 5. Has been.

  The boom support portion 8a is configured to rotate around the rotation axis RA by an expansion / contraction operation of a cylinder (not shown) disposed on the right side of the swing bracket 9, and can swing the front attachment 6 in the left-right direction. Thereby, for example, operations such as excavation of lateral grooves can be performed.

  Reference numeral 10 denotes an arm connected to the tip of the swing boom 7, and 11 denotes a bucket connected to the tip of the arm 10. Reference numeral 12 denotes a boom cylinder that raises and lowers the swing boom 7, reference numeral 13 denotes an arm cylinder that swings the arm 10 in the front-rear direction, and reference numeral 14 denotes a bucket cylinder that swings the bucket 11 in the front-rear direction. Reference numeral 15 denotes a counterweight provided at the rear end of the upper swing body 5.

  FIG. 2 shows the revolving frame 16 of the upper revolving structure 5 with the guard panel 5b removed.

  In the figure, a pair of vertical ribs 16a and 16b are erected on the revolving frame 16 in the front-rear direction, the front ends of these vertical ribs 16a and 16b are connected to the swing bracket 9, and the rear end is revolving. The frame 16 is connected to a rear rib 16c erected in the left-right direction at the rear portion. The opening 16d formed in the center of the turning frame 16 is for passing a swivel joint provided in the lower traveling body 3.

  An engine 17 is disposed at the rear portion of the turning frame 16 with the drive shaft directed in the left-right direction, and a hydraulic pump 18 is directly connected to the output shaft of the engine 17.

  Further, a cooling fan (not shown) is provided on the right side of the engine 17, and a radiator (not shown) is disposed to face the cooling fan.

  Further, a space for installing the driver's seat 5a (see FIG. 1) is secured on the left side of the front portion of the turning frame 16, and a hydraulic oil tank 19 is attached to the right side of the driver's seat 5a and outside the vertical rib 16a. It is done. A mounting plate 20 for mounting a control valve to be described later is fixed to the outer side wall of the hydraulic oil tank 19.

  FIG. 3 shows a state in which a control valve 21 as a hydraulic device is attached to the hydraulic oil tank 19.

  Pressure oil is sent from the hydraulic oil tank 19 to the hydraulic pump 18 (see FIG. 2), and the pressure oil discharged from the hydraulic pump 18 is sent to the control valve 21 via the delivery hose. Pressure oil is supplied to the actuator, and the pressure oil used for operation is returned to the hydraulic oil tank 19 through a return pipe.

  In the figure, 19a and 19b are return tubes through which return oil from the turning motor flows, and 19c is another return tube through which return oil that has passed through the oil cooler flows.

  The control valve 21 is fixed to the hydraulic oil tank 19 via a rectangular mounting plate 20. At the time of assembly, the control valve 21 is mounted on the mounting plate 20 in advance, and the mounting plate on which the control valve 21 is mounted. 20 is fixed to the outer side wall 19d.

  The mounting plate 20 is provided with fixing portions 20a to 20d (20d not shown) projecting from the corners, and through holes are formed in the fixing portions 20a to 20d. On the other hand, corresponding to these fixed portions 20a to 20d, fixed seats 19e to 19h (19h not shown) having female screw portions are provided on the outer side wall 19d of the hydraulic oil tank 19.

  The fixing seats 19e to 19h are made to correspond to the fixing portions 20a to 20d of the mounting plate 20, and the bolts 24 are screwed into the respective female screw portions of the fixing seats 19e to 19h via the ring-shaped vibration isolating rubber 22 and the washer 23, and tightened. Thus, the mounting plate 20 is fixed to the outer side wall 19 d of the hydraulic oil tank 19, whereby the control valve 21 is fixed integrally with the hydraulic oil tank 19.

  The control valve 21 is fixed in the vertical direction with the valve elements arranged in the vertical direction. Ports for connecting hydraulic pipes are provided on the front side and the rear side, respectively, and ports for pilot line connection are provided on the outer side surface. Is arranged. In the figure, reference numerals 21a and 21b denote the above-described delivery hoses.

  If the control valve 21 is fixed in the vertical direction as described above, there is an advantage that the mounting area of the turning frame 16 can be reduced. However, even when the control valve 21 is fixed in the lateral direction so that a plurality of valve bodies are arranged in the front-rear direction, the outer side wall 19d of the hydraulic oil tank 19 is inclined (front-rear) When the control valve 21 is fixed in the vertical direction, the hydraulic oil tank and the control valve 21 can be arranged in a compact manner, although the mounting area is slightly increased as compared with the case where the control valve 21 is fixed in the vertical direction.

  FIG. 4 is a plan view of the arrangement of the hydraulic oil tank 19 and the control valve 21 shown in FIG.

  In FIG. 4, the control valve 21 is disposed obliquely (relative to the front-rear direction) along the tangent line of the curve forming the side wall contour of the guard panel 5 b of the upper swing body 5.

  In the mounting plate 20, the plate portion 20 a corresponding to the control valve 21 is formed in parallel with the tangent line, and the plate portion 20 b not corresponding to the control valve 21 is formed in the front-rear direction, and is formed in a dogleg shape as a whole. ing.

  On the other hand, in the hydraulic oil tank 19 configured as a box, the front side wall 19i is in the left-right direction, the inner side wall 19j on the driver's seat side is in the front-rear direction, the rear side wall 19k is in the left-right direction, and the inner side wall 19j and the rear side A notch surface 19l that communicates with the side wall 19k is inclined, and an outer side wall 19d 'that faces the plate portion 20a is parallel to the plate portion 20a, that is, parallel to the tangent line, and is an outer side wall 19d that faces the plate portion 20b. Are formed in parallel with the plate portion 20b, that is, in the front-rear direction.

  That is, the side walls 19d and 19d 'on the control valve side in the hydraulic oil tank 19 function as a notch cut out in a U-shape, and the right rear portion 19m of the hydraulic oil tank 19 reduces the tank capacity. In order to prevent this, the control valve 21 is pushed outward (to the right) so as to follow.

  With the above-described configuration, the hydraulic oil tank 19 and the control valve 21 are integrated without any useless space therebetween, and the side wall of the guard panel 5b is formed without generating useless space for the guard panel 5b. It is provided close to.

  Further, if the hydraulic oil tank 19 and the control valve 21 can be arranged close to each other and the control valve 21 can be arranged close to the guard panel 5b, the hydraulic oil tank 19 is moved to the right than the conventional arrangement. As a result, the driver's seat space can be expanded by moving the hydraulic oil tank 19 in the right direction.

  FIG. 5 shows another form of the notch formed in the hydraulic oil tank 19.

  In the figure, the same components as those in FIG. 4 are denoted by the same reference numerals, and the description thereof is omitted.

  In FIG. 5 (a), the hydraulic oil tank 19 is formed in an L shape to form a notch 19n in a part of its side wall, and the control valve 21 is disposed in the notch 19n.

  In FIG. 5B, an inclined surface 19p that is parallel to the tangent line of the guard panel 5b is formed, and the control valve 21 is disposed between the guard panel 5b and the inclined surface 19b.

  In FIG. 5C, the hydraulic oil tank 19 is formed in an L shape to form a notch 19q in a part of its side wall, and the control valve 21 and the hydraulic oil tank 19 are stepped along the guard panel 5b. It is arranged in.

  In the above embodiment, the notch is formed in a part of the side wall of the hydraulic oil tank 19, but the present invention is not limited to this, and a recess can be formed as shown in FIG.

  FIG. 6A shows a concave portion 19r formed in a U-shape on the guard panel side wall of the hydraulic oil tank 19. In this case, the control valve 21 is disposed so as to be fitted in the recess 19r.

  In FIG. 6B, an inclined surface 19s parallel to the tangent line of the guard panel 5b is formed in the recess, and the control valve 21 is arranged between the guard panel 5b and the inclined surface 19s.

1 is an external view of a small excavator according to the present invention. It is a perspective view which shows the apparatus arrangement | positioning on the turning frame of the small shovel shown in FIG. It is an expansion perspective view which shows arrangement | positioning of a hydraulic-oil tank and a control valve. It is a top view of FIG. It is explanatory drawing which shows the other form of the notch part formed in a hydraulic oil tank. It is explanatory drawing which shows the form of the recessed part formed in a hydraulic oil tank. It is a top view which shows the apparatus arrangement | positioning in the conventional upper revolving body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Small excavator 2 Crawler shoe 3 Lower traveling body 4 Dozer device 5 Upper revolving body 5b Guard panel 6 Front attachment 7 Canopy 8 Swing boom 9 Swing bracket 10 Arm 11 Bucket 15 Counterweight 16 Swing frame 17 Engine 18 Hydraulic pump 19 Hydraulic oil tank 20 Mounting plate 21 Control valve

Claims (5)

In a small excavator having a structure in which an upper swing body is rotatably mounted on a lower traveling body, and a hydraulic oil tank, a hydraulic device, etc. mounted on a swing frame of the upper swing body are housed in a guard panel.
A small excavator, wherein a notch or a recess is formed in a part of a side wall of the hydraulic oil tank, and the hydraulic device is arranged corresponding to the notch or the recess.   The small excavator according to claim 1, wherein the side wall of the guard panel is formed in a curved line when viewed from above, and the hydraulic device is arranged in parallel with a tangent line passing through the curved line of the side wall of the guard panel.   The small excavator according to claim 1 or 2, wherein a driver's seat is disposed on one side of the front of the upper swing body, and the hydraulic oil tank is disposed on the other side of the front and on the side of the driver's seat.   The small excavator according to any one of claims 1 to 3, wherein the hydraulic device has a directional control valve, and the directional control valve is fixed to the notch or the recess.   The small-sized excavator according to claim 4, wherein the directional control valve has a vertically long shape in which a plurality of valve bodies are arranged in the vertical direction.