JP2000336610A - Road roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the workability at the time of maintenance of an engine or the like. SOLUTION: A front mount member 33 and a rear mount member 34 to be provided in a frame 32 of a front car body 31 are arranged in rear of the axis O1-O2 of the rotation of a front rolling compaction roller 6, and an engine 13 is fitted to the frame 32 through each mount member 33, 34 in a condition that a front end 14A of a cooling fan 14 is positioned in rear of the axis O1-O2 of the rotation of the front rolling compaction roller 6. With this structure, an oil cooler 17 can be arranged so that a front end 17A thereof is positioned in rear of the front end 6A of the front rolling compaction roller 6 at 400 mm or more, and a front end of the front car body 31 can be provided with a step plate 36. Consequently, an operator can do the maintenance of an engine 13 or the like in the stable posture on the step plate 36, and workability of the maintenance is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road roller suitably used for pavement work for compacting a pavement material such as gravel or asphalt spread on a road surface or the like.

[0002]

2. Description of the Related Art Generally, a road roller such as a drum roller, a tire roller, a macadam roller or the like is used when performing a pavement work on a road surface or the like. A method is employed in which a pavement material is compacted by running a road roller.

[0003] Such a prior art load roller will be described with reference to FIGS. 7 to 9.

In the figure, reference numeral 1 denotes a road roller body.
The vehicle body 1 includes a front vehicle body 2 on which left and right front side pressure rollers 6 to be described later are rotatably provided, and a rear side pressure roller 7 to be described later is rotatably provided. A rear vehicle body 4 is connected to the front vehicle body 2. And
Between the front vehicle body 2 and the rear vehicle body 4, a steering cylinder 5 that moves the rear vehicle body 4 with respect to the front vehicle body 2 around the coupling device 3 is disposed.

[0005] Reference numerals 6 and 6 denote left and right front-side compaction rollers rotatably provided on the front body 2, respectively.
Is made of, for example, a metal drum, and has a configuration in which the weight can be adjusted by sealing water or the like inside. The left and right front side pressure rollers 6 are driven to rotate by a hydraulic motor 10 described later.

[0006] Reference numeral 7 denotes a rotatably provided 1 on the rear body 4.
The rear compaction roller 7 includes a metal drum having an axial dimension larger than that of the front compaction roller 6, and has a water inside like the front compaction roller 6. The weight can be adjusted by enclosing the components. The rear pressure roller 7 is driven to rotate by a hydraulic motor (not shown) provided on the rear vehicle body 4.

[0007] The load roller travels on the road surface by rotating each of the front-side pressure roller 6 and the rear-side pressure roller 7 at the same rotational speed. The pavement material laid on the road surface is rolled by the side pressure roller 7.

Reference numeral 8 denotes a frame constituting the front vehicle body 2. The frame 8 includes left and right side plates 8A, 8A, a rear plate 8B connecting the rear ends of the side plates 8A, and each side plate. A cross beam 8C connecting the lower middle portion of 8A in the left and right directions, a cross beam 8D connecting the upper front end of each side plate 8A in the left and right directions, and a lower front end of each side plate 8A. It is generally constituted by a front guard plate 8E, and an engine 13 to be described later is accommodated between the side plates 8A. Here, even if there is an obstacle such as a building, the front end 6A of the front-side pressure roller 6 is located forward of the front end of the frame 8 so that the road surface can be rolled as close as possible to the obstacle. It is preferable that it protrudes.

Reference numeral 9 denotes a floor plate which constitutes the front vehicle body 2 together with the frame 8. The floor plate 9 is made of a substantially rectangular steel plate, and the upper surface side of the frame 8 is closed from the front and rear intermediate portions to the rear end portion. I have. Then, on the floor plate 9, each of the driver's seats 20, the cockpit 21 and the like described later are arranged.

Reference numerals 10 and 10 denote left and right hydraulic motors, respectively, attached to the front intermediate portions of the side plates 8A of the frame 8, and the hydraulic motors 10 are hydraulic pumps 15 to be described later.
The supply and discharge of pressure oil from the
Is driven to rotate about the rotation axis O1-O1.

Reference numerals 11 and 11 denote left and right front mount members, one each provided on the inner surface of each side plate 8A of the frame 8, and 12 and 12 are positioned rearward of the front mount members 11 and Left and right rear mounting members provided one by one on the inner surface of the side plate 8A.
Reference numerals 1 and 12 support the engine 13.

Here, each of the front mounting members 11 is disposed almost directly above the rotation axis O1-O1 of the front pressure roller 6, and each of the rear mounting members 12 is located behind the rotation axis O1-O1. Are located.

Reference numeral 13 denotes an engine mounted on the frame 8 via the mounting members 11 and 12.
The cooling fan 14 is disposed in a vertically installed state extending forward and rearward with the cooling fan 14 as a front side.
Is located on the front side of the rotation axis O1-O1 of the front-side pressure roller 6. A hydraulic pump 15 driven by the engine 13 is attached to the rear end of the engine 13, and the hydraulic pump 15 discharges hydraulic oil toward each hydraulic motor 10 and the like.

Reference numeral 16 denotes a radiator which is located on the front side of the cooling fan 14 of the engine 13 and is provided between the side plates 8A of the frame 8, and 17 denotes a radiator which is located on the front side of the radiator 16 and each of the side plates 8A of the frame 8. The radiator 16 and the oil cooler 17 constitute an heat cooler provided between the oil coolers. And the radiator 16
Cools the cooling water for the engine 13 by the cooling air generated in the frame 8 by the cooling fan 14, and the oil cooler 17 is supplied from the hydraulic motor 10 or the like to a tank (not shown).
This is for cooling the working oil returning to.

The oil cooler 17 has a front end 17A that is 100 m longer than the front end 6A of the front-side pressure roller 6.
It is disposed at a position behind by a distance a of m to 300 mm. The radiator 16 is disposed at a position where the upper end portion 16A is higher than the upper end portion 6B of the front-side pressure roller 6 by a distance b.

Reference numeral 18 denotes a radiator grill provided on the upper front end of the left and right side plates 8A of the frame 8, and the radiator grill 18 is mounted between the front guard plate 8E and the cross beam 8D. And the radiator grill 18
A radiator 16 and an oil cooler 17 which are made of a rectangular steel plate provided with a plurality of ventilation holes and are accommodated in a frame 8
Etc. are covered from the front side.

An upper surface cover 19 is provided at the front upper end of the frame 8 so as to be openable and closable.
Is arranged from the front side to the upper end side of the radiator grill 18 and covers the engine 13, the radiator 16, the oil cooler 17 and the like housed in the frame 8 from above.

Reference numerals 20 and 20 denote a floor plate 9 separated from each other in the left and right directions.
Two driver's seats 21 mounted on the upper rear side are control tables which are located in front of the respective driver's seats 20 and are provided on the floor plate 9 and extend in the left and right directions. Among them, steering devices 22, 22 and the like for steering are provided at positions corresponding to the left and right driver's seats 20. When one of the steering devices 22 is steered, the above-described steering cylinder 5 expands and contracts, and the rear vehicle body 4 follows the front vehicle body 2 around the coupling device 3 to move. Is controlled. The upper side of each driver's seat 20 is covered with a canopy 23.

The road roller according to the prior art has the above-described configuration. When pavement work is performed on a road surface using the road roller, an operator sitting in the driver's seat 20 operates the steering device 22 and the like. The road roller is run, and the surface of the pavement material laid on the road surface is compacted by the front-side compaction roller 6 and the rear-side compaction roller 7 to perform pavement work on the road surface.

[0020]

Prior to paving work on a road surface using the above-described road roller, it is necessary to perform maintenance on the engine 13 and the like. , The operator
The vehicle moves from the floor plate 9 to the upper surface of the front-side pressure roller 6, and the upper surface cover 19 is opened on the front-side pressure roller 6 to open the engine 13.
And maintenance.

However, since the surface of the front-side compaction roller 6 is liable to slip due to mud, pavement material and the like attached during pavement work, the operator places the engine 13 in an unstable posture.
Etc. must be maintained. In addition, since the engine 13 is located at a position lower than the upper surface of the front-side pressure roller 6 which is the operator's step, the maintenance of the engine 13 must be performed in an unnatural posture, and the workability is poor. is there.

In the load roller according to the prior art, the front end 14A of the cooling fan 14 is located forward of the rotation axis O1-O1 of the front pressure roller 6, so that it is located forward of the cooling fan 14. Oil cooler 17 to be installed
The space between the oil cooler 17 and the radiator grill 18 is narrow, and cooling air from the cooling fan 14 is supplied between the oil cooler 17 and the radiator grill 18 by the radiator 16 and the oil cooler 17.
It is difficult to provide a duct or the like for guiding the air.

Therefore, not only does the cooling efficiency of the cooling water by the radiator 16 and the cooling efficiency of the working oil by the oil cooler 17 decrease, but also the operating noise of the engine 13 leaking outside through the radiator grill 18 and the cooling fan 1
No. 4, noise such as wind noise cannot be attenuated by the duct, and there is a problem that the working environment around the road roller is deteriorated.

Further, the prior art road roller is
The upper end 16A of the radiator 16 is
The upper cover 19 that covers the radiator 16 projects significantly above the upper end 6B of each front-side pressure roller 6 because the upper end 6B protrudes upward by a distance b from the upper end 6B.

For this reason, for example, an operator sitting on the left driver's seat 20 can easily see the front outer peripheral edge of the left front side pressure roller 6, but the right front side pressure roller 6.
Is difficult to see because the front outer peripheral edge of the front panel is blocked by the top cover 19. For this reason, the operator cannot accurately grasp whether or not the paving material or the like adheres to the surface of each front-side pressure roller 6 during the pavement work, and the workability during the pavement work is reduced. There's a problem.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a load roller capable of improving workability when performing maintenance and maintenance on an engine and the like. It is in.

It is another object of the present invention to provide a load roller capable of improving the cooling efficiency of a heat exchange device.

Still another object of the present invention is to provide a road roller that enables an operator sitting in a driver's seat to perform a pavement operation while reliably observing the state of the surface of each front-side pressure roller. To provide.

[0029]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a front vehicle body in which left and right front pressure rollers are rotatably provided and a driver's seat is provided on a floor plate; A rear body connected to the front body and rotatably provided with a rear pressure roller, an engine extending forward and rearward with the cooling fan on the front body, and a cooling fan for the engine; The present invention is applied to a load roller including a heat exchange device provided on the front vehicle body and located on a front side of the vehicle.

The first aspect of the present invention is characterized in that the front vehicle body is provided with a mount member that is located behind the rotation axis of each front roller and supports the engine. In the engine, the cooling fan is mounted on the mount member in a state where the cooling fan is located on the rear side rather than immediately above the rotation axis of each front pressure roller.

With this configuration, the mounting position of the engine can be shifted to the rear side of the front vehicle body, and a large space can be formed in the front side of the front vehicle body by this amount. For example, a step board serving as a step for performing maintenance of an engine or the like, a duct for guiding cooling air from a cooling fan to a heat exchanger, or the like can be provided.

According to a second aspect of the present invention, the front vehicle body is provided with a tread plate which is located on the front side of the heat exchange device and is a step for performing maintenance of the engine.

With this configuration, the operator can perform maintenance of the engine and the like with a stable posture using the tread as a step without getting on the front-side compaction roller. Can be improved.

According to a third aspect of the present invention, the front vehicle body is provided with a duct which is located on a front side of the heat exchange device and guides cooling air from the cooling fan to the heat exchange device.

With this configuration, the cooling air can be guided to the heat exchanger by the duct, and the cooling efficiency of the heat exchanger can be increased. Further, the working environment around the road roller can be improved by attenuating the noise such as the operating noise of the engine and the wind noise of the cooling fan by the duct.

According to a fourth aspect of the present invention, the heat exchanging device is arranged at a position where the upper end thereof is lower than the upper end of each of the front side compaction rollers.

According to a fifth aspect of the present invention, the front vehicle body is provided with an upper surface cover for covering the engine and the heat exchange device from above, and the upper surface cover is positioned between an eye position of an operator seated in the driver's seat and the eye position. It is configured to be arranged at a position lower than a tangent connecting the front outer peripheral edge of the front side pressure roller.

With this configuration, the operator sitting in the driver's seat can visually observe the front outer peripheral edge of each front-side pressure roller without being obstructed by the upper cover, while sitting in the driver's seat. It is possible to accurately grasp whether or not a pavement material or the like is attached to the surface of each front-side pressure roller.

According to a sixth aspect of the present invention, in the heat exchanging device, the front end of the heat exchange device is more than the front end of each of the front-side compaction rollers.
mm or more rearward.

With this configuration, a distance of 400 m is provided between the front end of the heat exchange device and the front end of the front-side compaction roller.
A large space having a length dimension of m or more can be formed.

[0041]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a load roller according to the present invention will be described below in detail with reference to FIGS. First, FIG. 1 to FIG. 3 show a first embodiment according to the present invention. In the present embodiment, the same components as those in the above-described conventional technology are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, reference numeral 31 denotes a front body applied to the present embodiment instead of the front body 2 according to the prior art. The front body 31 is generally constituted by a frame 32, a floor plate 9 and the like which will be described later. I have.

Reference numeral 32 denotes a frame which constitutes the front vehicle body 31 together with the floor panel 9. As shown in FIGS. 2 and 3, the frame 32 includes left and right side panels 32A, 32A and rear panels 32A. A rear plate 32B for connecting the end sides;
Cross beam 32C that connects the lower middle part of 2A in the left and right directions
Similarly, a cross beam 32D connecting the upper front end side of each side plate 32A in the left and right directions and a front guard plate 32E connecting the lower front end side of each side plate 32A are generally constituted, and between each side plate 32A. Is an engine 13, a radiator 16,
The oil cooler 17 and the like are accommodated.

Here, of the front end side of each side plate 32A, a portion above the front guard plate 32E is cut out so as to be recessed in a substantially rectangular shape toward the rear, thereby forming the lower front end of each side plate 32A. On the side, a step portion 32F for providing a tread plate 36 described later is formed. Further, the front end portion 6 of the front-side pressure roller 6 can be pressed by the front-side pressure roller 6 so that the road surface can be pressed as close as possible to an obstacle such as a building.
A projects forward from the front end of the frame 32.

Reference numerals 33, 33 denote left and right front mount members applied to the present embodiment in place of the front mount members 11 according to the prior art, and reference numerals 34, 34 denote main mounts instead of the rear mount members 12 according to the prior art. The left and right rear mount members applied to the embodiment are the respective mount members 33 and 34.
Are provided on the inner side surface of each side plate 32 </ b> A of the frame 32, and are all located behind the rotation axis O <b> 1-O <b> 1 of the front-side pressure roller 6.

Here, the engine 13 includes a cooling fan 14
Of the front end portion 14A of the front-side pressure roller 6
In the state located behind O1, each mounting member 3
It is configured to be attached to the frame 32 via the members 3 and 34. It should be noted that under the condition that dimensions A1, A2, or A3 described below are reduced, the cooling fan 14
Of the front side pressure roller 6 is the rotation axis O1-O.
The engine 13 may be arranged at a position just above and near the engine 1.

The oil cooler 17 is disposed at a position where the front end 17A is behind the front end 6A of the front-side pressure roller 6 by a distance A, and the distance A is 400 mm.
It is set above. Here, the reason why the distance A is set to be 400 mm or more is that the front and rear dimensions A1 of the tread plate 36 described later are set to 300 mm corresponding to the size of the foot of the operator, and the tread plate 36 extends from the front end 6A of the front-side pressure roller 6. The dimension A2 from the radiator grille 35 to the front end 17A of the oil cooler 17 is set to 50 mm to 100 mm. The radiator 16 is disposed at a position where the upper end 16A is lower than the upper end 6B of the front-side pressure roller 6 by a distance B.

35 is a radiator 16 and an oil cooler 17
The radiator grill 35 is formed of a rectangular steel plate provided with a plurality of ventilation holes 35A, 35A,. And the radiator grill 35
Is mounted using bolts (not shown) or the like between each of the side plates 32A constituting the frame 32 and a portion above the step portion 32F and the cross beam 32D.

Reference numeral 36 denotes a tread provided on the upper edge of each step portion 32F of the frame 32. The tread 36 is formed of a rectangular steel plate extending in the left and right directions, and using bolts (not shown) or the like. By being fixed to each step 32F, it extends horizontally between the front guard plate 32E and the radiator grille 35. The tread 36 forms a flat surface which is a step for an operator who performs maintenance of the engine 13 and the like.

Reference numeral 37 denotes an upper surface cover applied to the present embodiment in place of the upper surface cover 19 according to the prior art. The upper surface cover 37 is provided on the front surface of the control table 21 disposed on the floor plate 9 via a hinge member. It is rotatably mounted. The top cover 37 opens and closes between a closed position shown by a solid line in FIG. 1 and an open position shown by a two-dot chain line, and normally keeps the closed position to cover the engine 13 and the like from above. 13
It is opened to the open position when performing maintenance such as.

The road roller according to the first embodiment has the above-described configuration, and the basic operation of compacting a pavement material or the like laid on the road surface during pavement work is significantly different from that of the prior art. There is no.

However, according to the present embodiment, it is possible to improve workability when performing maintenance on the engine 13 and the like housed in the frame 32. Hereinafter, the engine 13 and the like will be described. The maintenance work for is described.

First, the operator gets on the tread plate 36,
The top cover 37 is opened to an open position indicated by a two-dot chain line in FIG. Then, the operator can safely perform maintenance on the engine 13 and the like by taking a forward bent position on the tread plate 36.

As described above, the operator can perform maintenance of the engine 13 and the like with a stable posture on the tread plate 36. Therefore, for example, when the maintenance of the engine 13 and the like is performed by using the front roller 6 as a step. In comparison, work can be performed safely and efficiently.

Thus, according to the present embodiment, each of the mount members 33 and 34 provided on the frame 32 is disposed rearward of the rotation axis O1-O1 of the front-side pressure roller 6, and the engine 13 To the front end 1 of the cooling fan 14.
4A is attached to the frame 32 via the mount members 33 and 34 in a state where the 4A is located behind the rotation axis O1-O1 of the front-side pressure roller 6. For this reason, the oil cooler 17 maintains the structure in which the front end 6A of the front-side pressure roller 6 projects forward from the front end of the frame 32.
The front end 17A of the front-side pressure roller 6
And 400 mm or more behind.

As a result, the tread plate 36 can be provided at the front end side of the front vehicle body 31 at a position forward of the oil cooler 17, and the operator can maintain the engine 13 or the like with a stable posture on the tread plate 36. Can do
The workability of this maintenance can be improved.

Next, FIG. 4 shows a second embodiment according to the present invention. The feature of this embodiment is that it is located on the front end side of the front vehicle body and on the front side with respect to the front end of the heat exchanger. The configuration is such that a duct is provided. In the present embodiment, the same components as those of the above-described related art are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, reference numeral 41 denotes a front body applied to the present embodiment instead of the front body 2 according to the prior art. The front body 41 has a frame similar to the front body 2 according to the prior art. , A radiator 1 between the side plates 8A of the frame 8, and the like.
6. Although the oil cooler 17 and the like are accommodated, the difference is that a duct 44 described later is provided on the front side of the oil cooler 17.

Reference numerals 42, 42 denote left and right front mount members applied to the present embodiment instead of the front mount members 11 according to the prior art, and 43, 43 denote main mounts instead of the rear mount members 12 according to the prior art. The left and right rear mount members applied to the embodiment are the respective mount members 42 and 43.
Are provided on the inner side surface of each side plate 8A of the frame 8, and all of them are disposed rearward of the rotation axis O1-O1 of the front-side pressure roller 6.

Here, the engine 13 includes a cooling fan 14
Of the front end portion 14A of the front-side pressure roller 6
In the state located behind O1, each mounting member 4
It is configured to be attached to the frame 8 via the components 2 and 43.

The oil cooler 17 is disposed at a position where the front end portion 17A is behind the front end portion 6A of the front roller 6 by a distance A, and the distance A is set to 400 mm or more. Here, the reason that the distance A is set to 400 mm or more is based on the fact that the length dimension required for the duct 44 described later is 300 mm to 400 mm. The radiator 16 is disposed at a position where the upper end 16A is lower than the upper end 6B of the front-side pressure roller 6 by a distance B.

Reference numeral 44 denotes a duct provided between the oil cooler 17 and the radiator grill 18 and provided in the frame 8. The duct 44 has a width of 300 mm to 400 mm having open ends on both front and rear sides. A cylindrical body having a length is provided. The front end of the cylindrical body is fixed to the inner surface of the radiator grill 18 using bolts (not shown) or the like, and the rear end is open to the front end 17A of the oil cooler 17.

The duct 44 adjusts the direction of the cooling air from the cooling fan 14 when the engine 13 is operating, and guides the cooling air to the radiator 16 and the oil cooler 17.
A function of increasing the cooling efficiency of the cooling water by the radiator 16 and a cooling efficiency of the working oil by the oil cooler 17; and a function of attenuating noise such as the operating noise of the engine 13 leaking to the outside through the radiator grill 18 and the wind noise of the cooling fan 14. It demonstrates.

The road roller according to the second embodiment has the above-described configuration, and the basic operation of compacting a pavement material or the like laid on the road surface during pavement work is significantly different from that of the prior art. There is no.

However, according to the second embodiment, each of the mount members 42 and 43 provided on the frame 8 is disposed rearward of the rotation axis O1-O1 of the front pressure roller 6; The engine 13 is connected to the front end 1 of the cooling fan 14.
4A is attached to the frame 8 via the mount members 42 and 43 in a state where the 4A is located behind the rotation axis O1-O1 of the front-side pressure roller 6. Accordingly, the oil cooler 17 can be disposed at a position where its front end 17A is at least 400 mm behind the front end 6A of the front-side pressure roller 6.

Therefore, in the load roller according to the second embodiment, a duct 44 can be provided between the oil cooler 17 and the radiator grill 18 on the front end side of the front vehicle body 41. The duct 44 guides the cooling air to the radiator 16 and the oil cooler 17, thereby cooling the cooling water by the radiator 16 and the oil cooler 1.
7 can improve the cooling efficiency of the working oil. Also,
The duct 44 can attenuate noises such as the operating noise of the engine 13 and the wind noise of the cooling fan 14 leaking to the outside through the radiator grill 18, so that the working environment around the load roller can be improved.

Next, FIG. 5 shows a third embodiment according to the present invention. The feature of this embodiment is that it is located on the front end side of the front vehicle body and on the front side of the front end of the heat exchanger. The configuration is such that a plate-shaped duct is provided. In the present embodiment, the same components as those of the above-described related art are denoted by the same reference numerals, and description thereof will be omitted.

In the drawing, reference numeral 51 denotes a front body applied to the present embodiment instead of the front body 2 according to the prior art. The front body 51 is substantially the same as the front body 2 according to the prior art. , A radiator 1 between the side plates 8A of the frame 8, and the like.
6. Although the oil cooler 17 and the like are accommodated, the difference is that a duct 54 described later is provided on the front side of the oil cooler 17.

Reference numerals 52, 52 denote left and right front mount members applied to the present embodiment in place of the front mount members 11 according to the prior art, and 53, 53 denote main mounts instead of the rear mount members 12 according to the prior art. The left and right rear mounting members applied to the embodiment are the respective mounting members 52 and 53.
Are provided on the inner side surface of each side plate 8A of the frame 8, and all of them are disposed rearward of the rotation axis O1-O1 of the front-side pressure roller 6.

Here, the engine 13 includes a cooling fan 14
Of the front end portion 14A of the front-side pressure roller 6
In a state located behind O1, each mounting member 5
It is configured to be attached to the frame 8 via the members 2 and 53.

The oil cooler 17 is disposed at a position where its front end 17A is behind the front end 6A of the front-side pressure roller 6 by a distance A, and the distance A is set to 400 mm or more.

Numeral 54 denotes a duct according to the present embodiment which is provided between the oil cooler 17 and the radiator grill 18 and provided between the side plates 8A of the frame 8.
Is formed of a flat plate, and extends obliquely downward from the cross beam 8D of the frame 8 toward the lower end of the oil cooler 17. The duct 54 uses the outside air taken into the frame 8 through a ventilation hole 55A formed in the upper surface cover 55, which will be described later, as cooling air to cool the oil cooler 17 and the radiator 1.
It leads to 6.

Reference numeral 55 denotes an upper surface cover applied to the present embodiment in place of the upper surface cover 19 according to the prior art. The upper surface of the upper surface cover 55 located above the duct 54 has a plurality of ventilation holes 55A. , 55A,... Are formed. Each of the vents 55 </ b> A takes in outside air into the frame 8 when the engine 13 operates.

The load roller according to the third embodiment has the above-described configuration, and each of the mount members 52 and 53 provided on the frame 8 is connected to the rotation axis O 1 -O 1 of the front-side pressure roller 6. Arranged on the rear side, the engine 13 is mounted on the frame 8 via the mount members 52 and 53 in a state where the front end 14A of the cooling fan 14 is located rearward of the rotation axis O1-O1 of the front pressure roller 6. By attaching the oil cooler 17 to its front end 17A
Is disposed at a position 400 mm or more behind the front end 6A of the front-side pressure roller 6.

Therefore, the load roller according to the third embodiment can be provided with a plate-shaped duct 54 between the oil cooler 17 and the radiator grill 18. Then, the duct 54 guides the cooling air to the radiator 16 and the oil cooler 17, so that the cooling efficiency of the cooling water by the radiator 16 and the cooling efficiency of the working oil by the oil cooler 17 can be increased. Further, the duct 54 attenuates noises such as the operation noise of the engine 13 and the wind noise of the cooling fan 14 leaking to the outside through the ventilation holes 55A and the like provided in the top cover 55, thereby reducing the working environment around the road roller. Can be improved.

Next, FIG. 6 shows a fourth embodiment according to the present invention. The feature of this embodiment is that the upper cover for covering the engine and the heat exchange device from the upper side is provided by the eyes of the operator sitting in the driver's seat. And a position lower than a tangent line connecting the position and the front outer peripheral edge of the front-side pressure roller. In the present embodiment, the same components as those of the above-described related art are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, reference numeral 61 denotes a front body applied to the present embodiment instead of the front body 2 according to the prior art. The front body 61 is substantially constituted by a frame 62, a floor plate 9 and the like which will be described later. I have.

Reference numeral 62 denotes a frame which constitutes the front vehicle body 61 together with the floor panel 9. The frame 62 includes left and right side panels 62.
A (only one is shown), a rear plate 62B connecting the rear ends of the side plates 62A, a cross beam 62C connecting left lower intermediate portions of the side plates 62A in the left and right directions, and each side plate 6
A cross beam 62D connecting the upper front end side of 2A to the left and right directions
And a front guard plate 62E connecting the lower front end side of each side plate 62A, and an engine 13, a radiator 16, an oil cooler 17 are provided between each side plate 62A.
Etc. are accommodated.

Here, of the front end side of each side plate 62A, a portion above the front guard plate 62E is cut away so as to be recessed in a substantially rectangular shape toward the rear, thereby forming the lower front end of each side plate 62A. On the side, a step portion 62F for providing a tread plate 66 described later is formed. An inclined portion 62G that is inclined forward and downward is provided at a position near the cross beam 62D on the upper front end side of each side plate 62A.

Reference numerals 63, 63 denote left and right front mount members applied to the present embodiment in place of the front mount members 11 according to the prior art, and 64, 64 denote main mounts instead of the rear mount members 12 according to the prior art. The left and right rear mount members applied to the embodiment are the respective mount members 63 and 64.
Are provided on the inner side surface of each side plate 62 </ b> A of the frame 62, and are all located behind the rotation axis O <b> 1-O <b> 1 of the front-side pressure roller 6.

Here, the engine 13 includes a cooling fan 14
Of the front end portion 14A of the front-side pressure roller 6
In the state located behind O1, each mounting member 6
It is configured to be attached to the frame 62 via the holes 3 and 64.

The oil cooler 17 is disposed at a position where the front end 17A is behind the front end 6A of the front-side pressure roller 6 by a distance A, and the distance A is 400 mm.
It is set above. The radiator 16 is disposed at a position where the upper end 16A is lower than the upper end 6B of the front-side pressure roller 6 by a distance B.

Reference numeral 65 denotes a radiator 16 and an oil cooler 17
A radiator grill provided on the front end side of the frame 62 to cover the front and the like from the front side. The radiator grill 65 is formed of a rectangular steel plate provided with a plurality of ventilation holes. The radiator grill 65 is provided with a stepped portion 62F and a cross beam 6A among the side plates 62A constituting the frame 62.
It is attached to the 2D using a bolt (not shown) or the like.

Reference numeral 66 denotes a tread provided on the upper edge of each stepped portion 62F of the frame 62. The tread 66 is made of a rectangular steel plate extending in the left and right directions, using bolts (not shown) or the like. By fixing to each step 62F, a flat surface is formed as a step for an operator performing maintenance of the engine 13 and the like.

Reference numeral 67 denotes an upper surface cover applied to the present embodiment in place of the upper surface cover 19 according to the prior art. The upper surface cover 67 is provided on the front surface of the control table 21 disposed on the floor plate 9 via a hinge member. The engine 1
3. The radiator 16, the oil cooler 17, and the like are covered from above.

Here, a portion of the upper cover 67 located above the radiator 16 is provided with an inclined surface 67A which is inclined forward and downward along the inclined portion 62G of the frame 62. For example, when the operator sitting on the left driver's seat 20 looks at the front outer peripheral edge of the right front pressure roller 6, the inclined surface 67 </ b> A is positioned between the operator's eye position P and the front pressure roller 6. It is set at a position lower than a tangent line L (shown by a two-dot chain line in FIG. 6) connecting the front outer peripheral edge. Accordingly, the operator seated in the driver's seat 20 can reliably view the front outer peripheral edges of the left and right front-side pressure rollers 6 without being blocked by the upper cover 67.

The road roller according to the fourth embodiment has the above-described configuration, and the basic operation of compacting a pavement material or the like laid on the road surface during pavement work is significantly different from that of the prior art. There is no.

However, according to the fourth embodiment, the step board 66 is provided at the front end side of the front vehicle body 61 at a position forward of the oil cooler 17. Maintenance of the engine 13 and the like can be performed with a stable posture, and the workability of the maintenance can be improved.

Further, the upper cover 67 is arranged at a position lower than a tangent L connecting the position P of the eyes of the operator seated in the driver's seat 20 and the outer peripheral edge of the front side of the front pressure roller 6. In this case, the surface of each front-side pressure roller 6 can be reliably viewed without being blocked by the upper surface cover 67, regardless of whether the driver is seated on the left or right driver's seat 20. For this reason, the operator can accurately grasp whether or not the paving material or the like is attached to the surface of each front-side pressure roller 6 while manipulating the load roller, thereby improving the workability during the pavement operation. be able to.

In the first embodiment described above, the case where the tread plate 36 is provided on the front end side of the front vehicle body 31 is taken as an example, and in the second embodiment, the tread plate 36 is provided on the front end side of the front vehicle body 41. Although the case where the duct 44 is provided has been described as an example, the present invention is not limited to this, and a configuration in which the tread plate and the duct are provided on the front end side of the front vehicle body may be adopted.

Further, in each of the above-described embodiments, an example is described in which the engine 13 is disposed at a position where the cooling fan 14 is located behind the rotation axis O 1 -O 1 of each of the front pressure rollers 6. However, the present invention is not limited to this,
For example, the cooling fan 14 is located just above the rotation axis O1-O1,
Alternatively, the engine 13 may be provided at a position slightly forward of the rotation axis O1-O1.

[0092]

As described above in detail, according to the first aspect of the present invention, the left and right front compaction rollers are rotatably provided on the front vehicle body from the rotation axis of each front compaction roller. Also provided is a mount member that is located on the rear side and supports the engine, and the engine is configured to be mounted on the mount member in a state where the cooling fan is located on the rear side more than immediately above the rotation axis of each front pressure roller. Therefore, it is possible to shift the mounting position of the engine to the rear side of the front vehicle body while maintaining the structure in which the front end of the front side pressure roller protrudes forward from the front end of the front vehicle body. A large space can be formed on the front side of the. Thus, using the space formed on the front end side of the front vehicle body, for example, a step plate when performing maintenance and maintenance of an engine or the like, a duct for guiding cooling air from an engine cooling fan to a heat exchange device. Etc. can be provided.

According to the second aspect of the present invention, the front vehicle body is provided with a tread plate which is located on the front side of the heat exchange device and serves as a step when performing maintenance of the engine. Can perform maintenance of the engine and the like with a stable posture on the tread plate, and improve the workability of the maintenance and maintenance as compared with a case where the maintenance of the engine and the like is performed on, for example, a slippery front pressure roller. can do.

Further, according to the third aspect of the present invention, the front vehicle body is provided with a duct located on the front side of the heat exchange device and guiding the cooling air from the cooling fan to the heat exchange device. By guiding the cooling air to the heat exchange device through the duct, the cooling efficiency of the heat exchange device can be increased. Further, since noise such as engine operation noise and cooling fan wind noise leaking to the outside of the front vehicle body can be attenuated by the duct, the working environment around the road roller can be improved.

According to the fourth aspect of the present invention, the heat exchange device is arranged at a position where the upper end is lower than the upper end of each of the front-side compaction rollers. When an upper surface cover is provided to cover the engine and the heat exchange device from above, the upper surface cover is prevented from protruding upward, and a forward view can be secured.

According to the fifth aspect of the present invention, the top cover provided on the front vehicle body is lower than the tangent connecting the position of the eyes of the operator seated on the driver's seat to the front outer peripheral edge of the front roller. With this configuration, the operator seated in the driver's seat can visually observe the front outer peripheral edge of each front-side pressure roller without being blocked by the upper surface cover, while sitting in the driver's seat. Thereby, the operator can accurately grasp whether or not the paving material or the like is attached to the surface of each front-side compaction roller while operating the load roller,
Workability of paving work can be improved.

Further, according to the sixth aspect of the present invention, the heat exchanging device is configured so that its front end is located at least 400 mm behind the front end of each front-side compaction roller. A space having a length of 400 mm or more can be formed between the front end of the device and the front end of the front-side compaction roller, and a tread, a duct, and the like can be provided using this space.

[Brief description of the drawings]

FIG. 1 is a partially broken front view showing a load roller according to a first embodiment.

2 is a cross-sectional view showing a tread, an engine, a radiator, an oil cooler, and the like in FIG. 1 as viewed from the direction of arrows II-II in FIG. 1;

FIG. 3 is an exploded perspective view showing a frame, a mount member, a floor plate, a tread, a top cover, and the like in FIG. 1;

FIG. 4 is a partially broken front view showing a load roller according to a second embodiment.

FIG. 5 is a partially broken front view showing a load roller according to a third embodiment.

FIG. 6 is a partially broken front view showing a load roller according to a fourth embodiment.

FIG. 7 is a partially cutaway front view showing a conventional load roller.

FIG. 8 is a plan view showing a conventional load roller with a canopy removed.

FIG. 9 is a cross-sectional view showing an engine, a radiator, an oil cooler, and the like of a road roller according to the related art, as viewed from the direction of arrows IX-IX in FIG.

[Explanation of symbols]

 4 Rear Body 6 Front Rolling Roller 7 Rear Rolling Roller 13 Engine 14 Cooling Fan 16 Radiator (Heat Exchanger) 17 Oil Cooler (Heat Exchanger) 20 Driver's Seat 31,41,51,61 Front Body 33,42 , 52, 63 Front mounting member 34, 43, 53, 64 Rear mounting member 36, 66 Tread plate 44, 54 Duct 67 Top cover

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Yoshiyoshi Hirasawa 650, Kandate-cho, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. F-term in Tsuchiura Factory (reference) 2D052 AA03 AA04 AC01 AD01 AD11 BB01 BB05 DA27

Claims (6)

[Claims] 1. A front body having left and right front-side pressure rollers provided rotatably and a driver seat on a floor plate, and a rear-side pressure roller connected to the front body being rotatable. A rear body provided, an engine disposed in the front and rear directions with a cooling fan at the front of the front body, and a heat disposed on the front body located forward of the cooling fan of the engine. In the load roller comprising an exchange device, the front vehicle body is provided with a mount member located rearward of a rotation axis of each of the front-side pressure rollers, and the engine includes: A load roller, wherein the load roller is attached to the mount member in a state of being located rearward of a position immediately above a rotation axis of the pressure roller. 2. The road roller according to claim 1, wherein the front vehicle body is provided with a tread that is located on a front side of the heat exchange device and is a step when performing maintenance of the engine. 3. The load according to claim 1, wherein the front vehicle body is provided with a duct located at a front side of the heat exchange device and guiding the cooling air from the cooling fan to the heat exchange device. roller. 4. The load roller according to claim 1, wherein the heat exchange device is arranged at a position where an upper end thereof is lower than an upper end of each of the front side compaction rollers. 5. The front vehicle body is provided with an upper surface cover that covers the engine and the heat exchange device from above, and the upper surface cover is provided with a position of an eye of an operator seated in the driver's seat and the front pressure roller. 5. A structure arranged at a position lower than a tangent connecting the front outer peripheral edge.
The load roller according to 1. 6. The heat exchange device according to claim 1, wherein the front end of the heat exchange device is disposed at a position at least 400 mm behind the front end of each of the front-side compaction rollers.
Or the load roller according to 5.