JP3395870B2 - Revolving superstructure of construction equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a structure of a construction machine such as a hydraulic excavator and an upper swing body of a work vehicle.

[0002]

2. Description of the Related Art FIG. 9 is a side sectional view showing a part of an upper-part turning body 1 of a small excavator disclosed in Japanese Utility Model Publication No. 6-32434. As shown in FIG. 9, in the air introduction structure of the embodiment of the related art, an air duct 3 for sucking outside air from the lower opening 2 is formed. FIG. 10 is a perspective view of a small shovel disclosed in Japanese Utility Model Laid-Open No. 4-39917. In the small shovel shown in FIG. 10, the front part of the swing cylinder (not shown because it is on the opposite side of the cylinder cover 6 in the drawing) is made to project from the window hole 5 opened in the front part of the upper revolving structure 4, and the swing cylinder front end is fixed. The work attachment 8 is connected to the swing bracket 7, and the work attachment 8 is swung left and right via the swing bracket 7 by the expansion and contraction operation of the swing cylinder.

[0003]

In the air introducing structure of one embodiment of the prior art shown in FIG. 9, an air duct 3 is formed from the lower opening 2 to the oil tank 9. Since there is no space near the center of the inside of the upper revolving structure 1 of the small shovel, it is very difficult to form the air duct 3. Further, in a small shovel of another embodiment of the related art shown in FIG. 10, the rotation sound of an engine (not shown) mounted inside the rear side of the upper swing body 4 causes the floor surface 10 and the bottom surface of the upper swing body 4 to rotate. Since it is discharged to the outside through the window hole 5 through 11 and the engine noise is high and the condition is bad. Further, when setting an air flow path for cooling that allows a radiator (not shown) to pass through, if the window hole 5 is in an open state, the air passage becomes a complicated path, and a desired cooling effect can be exhibited. Can not. In order to solve the above problems, the present invention holds a swing cylinder rotating window hole opened in the front surface of the upper revolving structure in an open state, inside the window hole, and on the floor surface of the upper revolving structure. An object of the present invention is to provide a structure of an upper revolving structure in which a shield plate for blocking space communication between the window hole and the engine compartment and the lower opening is provided between the upper and lower surfaces.

[0004]

According to the present invention, an upper revolving structure equipped with an engine and a radiator is provided above a lower traveling structure, and outside air is sucked from a lower opening of the upper revolving structure by rotation of an engine fan. Air is discharged to the outside of the vehicle body through the radiator, and a front bracket is fixed to the front surface of the upper swing body, and a work attachment is connected to the front bracket through a swing bracket, and In a construction machine in which the swing bracket is connected to the rod tip end of a swing cylinder having a base end attached to the inner side of the upper swing body, a swing cylinder rotation window opened on the front surface of the upper swing body. The hole is held in an open state, and inside the window hole, between the floor surface and the bottom surface of the upper revolving structure, the window hole and the engine compartment and the lower opening It provided a shielding plate for blocking the pace communication. In the above case, the shield plate is formed by a front-back vertical plate along the longitudinal direction of the swing cylinder and a left-right vertical plate intersecting the longitudinal direction of the swing cylinder, and the horizontal vertical plate. Was formed into a split type that can be separated into right and left at the position of the swing cylinder through hole. Further, in the present invention, a composite having elasticity with respect to at least one of the front surface of the shield plate facing the window hole and the rear surface facing the engine compartment and the lower opening. A sound absorbing plate member made of a resin material was attached.

According to the present invention, the swing cylinder rotating window hole opened in the front surface of the upper swing body is held in an open state,
Inside the window hole, and between the floor surface and the bottom surface of the upper revolving structure, a shield plate for blocking the space communication between the window hole and the engine room and the lower opening is provided, so that the rotation of the engine fan is prevented. During the state, the outside air is not sucked through the window hole, and part of the engine rotation sound is not discharged through the window hole. Cooling air is sucked from a predetermined lower opening, guided to a radiator through a required air flow path, passes between fins of the radiator, and is discharged to the outside of the vehicle body. Further, the shield plate is formed by a front and rear vertical plate along the longitudinal direction of the swing cylinder and a left and right vertical plate intersecting the longitudinal direction of the swing cylinder. Since the position is close to the base end of the swing cylinder, the size of the swing cylinder through hole opened in the vertical plate in the left-right direction may be set to be slightly larger than the outer diameter of the cylinder tube of the swing cylinder. That is, it is possible to minimize the gap between the swing cylinder through hole and the swing cylinder to maintain the shielding. Further, since the above-mentioned left-right vertical plate is formed into a split shape that can be separated into right and left at the position of the swing cylinder through hole, the horizontal vertical plate can be easily attached to and detached from the position where the swing cylinder is arranged. Further, since a sound absorbing plate member made of a synthetic resin material having elasticity is attached to at least one of the front surface and the rear surface of the shield plate, the shield plate is more securely shielded and the engine rotation is improved. A part of the sound can be absorbed to reduce engine noise.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view of a hydraulic excavator having a structure of an upper swing body of the present invention. In the figure, 10 is a lower traveling body of the hydraulic excavator, 11 is an upper revolving body provided on the upper portion of the lower traveling body 10 so as to be freely rotatable, 1
2 is a floor surface of the upper swing body 11, 13 is a bottom surface, 14 is a front bracket fixed to the front surface of the upper swing body 11, 15 is a swing bracket connected to the front bracket 14, 16
Is a work attachment mounted on the swing bracket 15 (the overall view of the work attachment 16 is not shown), 17 is a swing cylinder, and 18 is a rod tip of the swing cylinder 17. FIG. 2 is a plan view of an incision main part showing an internal structure of the upper swing body 11 in FIG. In the figure, 19 is a water-cooled engine mounted on the upper revolving structure 11, 20 is an engine fan, 21 is a radiator, 22 is a shroud provided on the intake side of the radiator 21, and 23 is provided on the exhaust side of the radiator 21. A duct, 24 a hydraulic oil tank, 25 a fuel tank, 26
Is a control valve for controlling a plurality of hydraulic actuators mounted on the hydraulic excavator, and 27 is an upper swing body 11
Lower opening portion 2 which opens to the bottom surface 13 (see FIG. 1) of the 2
Reference numeral 8 is a window hole for swing cylinder 17 rotation opened on the front surface of upper revolving superstructure 11 and passing through swing cylinder 17, and 29 is a swing for a fixed portion (not shown) inside upper revolving superstructure 11. A base end pin that pivotally supports a base end portion of the cylinder 17 so as to be rotatable in the left-right direction, 30 is a front-rear vertical plate that is a shield plate along the longitudinal direction of the swing cylinder 17, and 31 is a longitudinal length of the swing cylinder 17. It is a horizontal vertical plate that is a shielding plate that intersects the direction.

FIG. 3 is a view as seen from AA in FIG.
In the figure, 32 is a frame vertical plate of the upper swing body 11,
Reference numeral 33 is an under cover attached to the rear lower surface side of the upper swing body 11. FIG. 4 is a view of the vertical plate 31 in the left-right direction in FIG. 2 viewed from BB. In the figure, 34 is an X plate of a horizontal vertical plate 31 formed in a split shape, and 35
Is a Y plate, 36 is a Z plate, 37 is a plurality of bolts and nuts that integrally fasten the X plate 34, the Y plate 35, and the Z plate 36 (the nut portion is not visible in the drawing), and 38 is the Y plate 35
And the swing cylinder through hole formed over the Z plate 36, and 39, 39 'are synthetic resin fitted to prevent damage caused by contact with hydraulic pipes (not shown) and the like. Material trim, 39 is a bolt and nut for fastening the Z plate 36 to the fixed portion of the upper swing body 11 by tightening. FIG. 5 is a plan view of the left-right vertical plate 31 of FIG. 4 viewed from C. In the figure, reference numeral 40 (several different shapes but given the same reference numerals) is a sound absorbing plate member formed of an elastic synthetic resin material such as urethane fixed to the front surface of the left-right warp plate 31. FIG. 6 shows FIG.
FIG. In the figure, 41 is a rubber plate of the longitudinal warp plate 30, 40 is a sound absorbing plate member fixed to the left side surface of the longitudinal warp plate 30, and 42 is the longitudinal warp plate 30 as a fixed portion of the upper swing body 11. It is a bolt that is tightened and fixed. FIG. 7 shows the vertical plate 30 in FIG.
FIG. FIG. 8 is a plan view seen from F in FIG. 7.

Next, the structure of the upper swing body 11 of the present invention will be described with reference to FIGS. In the present invention, the upper swing body 11
The window hole 28 (shown in FIG. 2) for rotating the swing cylinder 17 opened in the front surface of the
The space between the window hole 28, the engine compartment 43 (shown in FIG. 2) and the lower opening 27 inside the space between the floor surface 12 (shown in FIG. 1) and the bottom surface 13 of the upper swing body 11. Shielding plate for blocking communication (vertical plate 30 shown in FIG. 2)
And a horizontal vertical plate 31). In the above case, the shield plate is formed by the front and rear vertical plate 30 along the longitudinal direction of the swing cylinder 17, and the horizontal vertical plate 31 intersecting the longitudinal direction of the swing cylinder 17, and the left and right sides thereof. The directional vertical plate 31 is formed in a divided form of a Y plate 35, a Z plate 36, and an X plate 34 that can be separated right and left at the position of the swing cylinder through hole 38. Further, in the present invention, a synthetic resin material having elasticity, for example, urethane is used for the front surface of the left and right vertical plate 31 as shown in FIG. 5 and for the left side surface of the vertical vertical plate 30 as shown in FIG. The sound absorbing plate members 40 thus formed were fixed to each other with an adhesive material.

Next, the operation of the structure of the upper swing body 11 of the present invention will be described. According to the present invention, the window 28 for swinging the swing cylinder 17 opened in the front surface of the upper swing body 11 is held in an open state, and inside the window hole 28, the floor surface 12 and the bottom surface 13 of the upper swing body 11 are held. Between the window hole 28
And a shield plate (front-rear vertical plate 30 and left-right horizontal plate 31) for blocking space communication between the engine compartment 43 and the lower opening 27. Neither is it sucked from the hole 28, nor is part of the engine rotation noise emitted to the outside from the window hole 28. The cooling air is supplied from the lower opening 27 through the frame vertical plate 32 as shown by the arrow in FIG.
And the hydraulic oil tank 2 facing the frame vertical plate 32.
It is introduced upward by using the outer surface a for 4 as a guide.
Then, the hydraulic oil, which has been raised to a high temperature, circulates through the outer and outer peripheral surfaces of the hydraulic oil tank 24 and the control valve 26, and further, as shown by the arrow in FIG. Is not attached), between the fins (not shown) of the radiator 21,
It is discharged to the outside of the vehicle body through the duct 23. Further, the shield plate is formed by a front and rear vertical plate 30 along the longitudinal direction of the swing cylinder 17, and a horizontal vertical plate 31 which intersects the longitudinal direction of the swing cylinder 17, and the horizontal direction is defined by the vertical plate. Since the mounting position of the vertical plate 31 is close to the base end portion of the swing cylinder 17, the horizontal vertical plate 3 is attached.
The size of the swing cylinder through hole 38 formed in 1 may be set to be slightly larger than the outer diameter of the cylinder tube of the swing cylinder 17 (which is not circular because the hydraulic pipe is fixed to the swing cylinder 17). That is, the swing cylinder through hole 38 and the swing cylinder 17
The gap between and can be kept to a minimum and the shielding can be maintained. Further, since the horizontal vertical plate 31 is formed into a split shape that can be separated into right and left at the position of the swing cylinder through hole 38, the horizontal vertical plate 31 can be easily attached to and detached from the position where the swing cylinder 17 is arranged. You can Further, since a sound absorbing plate member formed of a synthetic resin material having elasticity is attached to the shield plate, the shield plate is more securely shielded and a part of the engine rotation sound is absorbed,
It is possible to reduce engine noise.

[0010]

According to the present invention, the swing cylinder rotating window hole opened on the front surface of the upper revolving superstructure is held in the open state, and inside the window hole, the floor surface and the bottom surface of the upper revolving superstructure are formed. Since a shield plate for blocking the space communication between the window hole and the engine compartment and the lower opening is provided therebetween, outside air is not sucked through the window hole when the engine fan is rotating, and the engine rotation is prevented. Part of the sound is not emitted to the outside through the window. Cooling air is sucked from a predetermined lower opening, guided to a radiator through a required air flow path, passes between fins of the radiator, and is discharged to the outside of the vehicle body. Further, the shield plate is formed by a front and rear vertical plate along the longitudinal direction of the swing cylinder and a left and right vertical plate intersecting the longitudinal direction of the swing cylinder. Since the position is close to the base end of the swing cylinder, the size of the swing cylinder through hole opened in the vertical plate in the left-right direction may be set to be slightly larger than the outer diameter of the cylinder tube of the swing cylinder. That is, it is possible to minimize the gap between the swing cylinder through hole and the swing cylinder to maintain the shielding. Also, the left and right vertical plates,
Since it is formed in a split shape that can be separated into right and left at the position of the swing cylinder through hole, the horizontal vertical plate can be easily attached to and detached from the position where the swing cylinder is arranged. Further, since a sound absorbing plate member made of a synthetic resin material having elasticity is attached to at least one of the front surface and the rear surface of the shield plate, the shield plate is more securely shielded and the engine rotation is improved. A part of the sound can be absorbed to reduce engine noise. Therefore, in construction machines and work vehicles such as hydraulic excavators having the structure of the upper swing body of the present invention, air for engine cooling can be made into one stable and smooth flow inside the upper swing body, and the engine rotation noise is generated by the upper swing. It is possible to prevent discharge from the window hole for arranging the swing cylinder on the front surface of the body.

[Brief description of drawings]

FIG. 1 is a side view of a hydraulic excavator having a structure of an upper swing body of the present invention.

FIG. 2 is a plan view of an incision main part showing an internal structure of an upper swing body in FIG.

FIG. 3 is a view seen from AA in FIG.

FIG. 4 is a diagram of the vertical plate in the left-right direction in FIG. 2 viewed from BB.

5 is a plan view of the left-right vertical plate of FIG. 4 viewed from C. FIG.

FIG. 6 is an enlarged view of part D in FIG.

FIG. 7 is a view of the front and rear vertical plates in FIG. 6 viewed from E.

FIG. 8 is a plan view seen from F in FIG. 7.

FIG. 9 is a side sectional view showing a part of an upper swing body of a small-sized shovel according to an embodiment of the prior art.

FIG. 10 is a perspective view of a small excavator that has been conventionally used.

[Explanation of symbols]

1,4,11 Upper revolving structure 5,28 window hole 12 floor 13 Bottom 17 Swing cylinder 19 engine 20 engine fan 21 radiator 24 hydraulic oil tank 26 Control valve 27 Lower opening 30 Vertical plate 31 Left-right vertical plate 38 Swing cylinder through hole 40 Sound absorbing plate member 43 Engine room

Claims (4)

(57) [Claims] 1. An upper revolving structure equipped with an engine and a radiator is provided above a lower traveling structure, and external air is sucked from a lower opening of the upper revolving structure by rotation of an engine fan, and the air is passed through the radiator to the vehicle body. The front bracket is fixed to the front part of the upper revolving structure, the work attachment is connected to the front bracket via the swing bracket, and the swing bracket and the upper revolving structure are connected to each other. In a construction machine in which the base end of the swing cylinder is attached to the inner end of the swing cylinder, the swing cylinder rotating window hole opened in the front surface of the upper swing body is held in an open state, Inside the window hole and between the floor and bottom of the upper revolving structure,
An upper revolving structure for a construction machine, comprising a shield plate for blocking space communication between the window hole and the engine room and the lower opening. 2. The upper revolving structure for a construction machine according to claim 1, wherein the shielding plate intersects with a longitudinal back plate in the longitudinal direction of the swing cylinder and the longitudinal direction of the swing cylinder. An upper revolving structure for a construction machine, which is formed by a vertical plate that is formed in the left-right direction. 3. An upper revolving structure for a construction machine according to claim 2, wherein the left-right vertical plate is formed in a split shape that can be separated into right and left at a position of a swing cylinder through hole. The upper revolving structure of construction machinery. 4. The upper revolving structure for a construction machine according to claim 2, wherein the front surface of the shield plate facing the window hole and the front surface of the shield plate facing the engine compartment and the lower opening. An upper revolving structure for a construction machine, wherein a sound absorbing plate member made of a synthetic resin material having elasticity is attached to at least one of the rear surfaces.