JPS6319270Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a traveling device such as an asphalt finisher.

The asphalt finisher, which applies pavement to the road surface, has a large hopper at the front of the tractor that stores the composite material, a screw at the rear of the tractor that spreads the composite material to a predetermined paving width, and a finisher that finishes the dispersed composite material to a uniform thickness. Each screed is equipped with a

By the way, when performing paving work with an asphalt finisher, it is necessary to control the positional relationship with the tip of the screed by changing the height of the screed in order to maintain a good finished surface depending on the thickness of the paving. . For this reason, in the past, the height of the screw itself was adjusted independently according to the pavement thickness, but this adjustment was extremely troublesome and had to be adjusted frequently during work, reducing paving work efficiency. This was hindering the improvement of

Furthermore, when loading an asphalt finisher onto a transport vehicle, the conventional asphalt finisher was hit by the screws and screeds, which caused the inconvenience that loading work could not be carried out quickly.

In addition, the conventional asphalt finishing traveling device has a structure that uses a balance beam to equalize the load on the left and right sides and improve the ground contact of the crawler. For this reason, the balance beam must have a strong structure, that is, be large and heavy, which causes the following problems.

(1) Since the balance beam is large and heavy, it is difficult and costly to manufacture, and it becomes an obstacle to reducing the weight of the asphalt finish.

(2) Since the balance beam is suspended horizontally from the left and right sides of the car body, the asphalt mixture is passed between the block chain of the feeder device that sends the asphalt mixture from the hopper to the rear of the car body. are mutually restricted, and not only cannot the arrangement of the feeder device be freely arranged, but also cannot have a simple structure, which causes an increase in cost.

This invention was created in view of the above points, namely, this invention can adjust the vehicle height and equalize the load on the vehicle body, is compact and has a simple structure, and is easy to maintain and replace. To provide a traveling device such as an asphalt finisher that can be installed even in a small space.

Therefore, in order to achieve this purpose, the traveling device such as the asphalt finisher of this invention has running wheels and a mounting fulcrum shaft provided on at least one of the left and right front sides and the left and right rear sides of the vehicle body. A unit frame 10 is attached to the unit frame 9 via a long hole 11 so as to be vertically movable; a hydraulic cylinder 13 is attached to the unit frame 10; a crank 14 whose side is connected to the hydraulic cylinder 13 with a pin 17 and whose engagement recess 16 formed at the other end is engaged with the mounting fulcrum shaft 9; This structure is characterized in that the running wheels of the unit frame 10 can be moved up and down via the mounting fulcrum shaft 9.

This invention will be explained in detail below with reference to illustrated embodiments.

FIG. 1 is a side view of an embodiment of the traveling device according to the present invention, which is an asphalt finisher installed on the left and right rear sides of the vehicle body of a tractor.

As shown in Figure 1, the asphalt finisher has a large hopper H mounted on the front of the tractor body 1 into which mixed material is fed, and a large hopper H into which mixed material is fed into the rear. It has a screed S that spreads the mixed material to a predetermined pavement width and a screed D that can be moved up and down by a leveling arm and level the spread material to create a road surface with a uniform thickness.

As shown in FIGS. 1 and 2, the rear side of the vehicle body 1 is provided with left and right starting wheels 2, 2, and the front side is provided with left and right idlers 3, 3. Crawlers 4, 4 are installed between 2, 2 and idler wheels 3, 3, respectively.

The vehicle body 1 includes idle wheels 3, 3 and starting wheels 2, 2.
Support shafts 5, 5 are protruded laterally between the idler wheels 3, 3, and the support shafts 5,
5 includes arms 7 and 7 of wheels 6 and 6 as running wheels.
is fitted in a rotatable manner, and the wheels 6, 6 are engaged with the ground side of the crawlers 4, 4.

On the other hand, traveling devices 8, 8 according to this invention are installed between the idler wheels 3, 3 and the starting wheels 2, 2 and at positions closer to the starting wheels 2, 2 of the vehicle body 1. The configuration of the traveling devices 8, 8 will be explained in detail with reference to FIGS. 2 to 4. Mounting fulcrum shafts 9, 9 protrude laterally from the rear side of the vehicle body 1, on which unit frames 10, 10 are movable up and down.
It is rotatably attached around 9. That is, elongated holes 11, 11 whose longitudinal directions extend in the vertical direction are formed in the central parts of the unit frames 10, 10, and the mounting fulcrum shafts 9, 9 are inserted through these elongated holes 11, 11. The structure is such that the unit frames 10, 10 can be moved up and down in the longitudinal direction of the elongated hole 11 with respect to the vehicle body 1. Further, rolling wheels 12, 12 as running wheels are attached to the front and rear portions of the unit frames 10, 10, and are engaged with the ground contact sides of the crawlers 4, 4.

A hydraulic cylinder 13 and a crank 14 are attached to the outer surfaces 10a, 10a of the unit frames 10, 10, respectively, as operating means for moving the unit frames 10, 10 up and down relative to the vehicle body 1. . The above crank 14
is rotatably attached via a fulcrum pin 15 provided at the front position of the elongated hole 11 on the outer surface 10a of the frame, and the engagement recess 16 formed at the rear side of the crank 14 is provided with the above-mentioned attachment point. The fulcrum shaft 9 is engaged.

The long hole 11 of the unit frame 10 and the engagement recess 16 of the crank 14 allow the mounting fulcrum shaft
At a predetermined vertical adjustment position, the unit frame 10 attached to the unit frame 10 is restrained from moving vertically and horizontally, and can only rotate about the mounting fulcrum shaft 9. In addition, the hydraulic cylinder 13
The cylinder bottom 13a side is rotatably connected to a pin 10b fixed to the unit frame 10, and the rod head 13b side is rotatably connected to a pin 17 on the upper edge of the crank 14.

In this embodiment, the pin 17, the fulcrum pin 15, and the engaging recess 16 are each set at positions forming an L-shape. Furthermore, as shown in FIG. 5, the left and right hydraulic cylinders 13, 13 have oil chambers on the rod side connected to each other by a pipe d1, and oil chambers on the piston side are connected to each other by a pipe P1. are in contact with each other. Each pipe d
1 and P1 are respectively connected to an oil tank, a hydraulic pump (not shown), etc. that constitute a pressure oil supply device through appropriate oil passage switching valves through pipes d2 and P2, and are connected to the oil pressure installed in the vehicle body 1. A control device (not shown) allows the left and right cylinders 13, 1 to be synchronously expanded and contracted with the same stroke from the driver's seat, or to operate according to the load without any operation from the driver's seat.
3 can extend and contract in opposite directions by the same stroke.

Further, retainers 18, 18 for preventing the unit frames 10, 10 of the traveling devices 8, 8 from coming off from the mounting fulcrum shafts 9, 9 are detachably attached to the outer ends of the mounting fulcrum shafts 9, 9. is attached to.

Next, the operation of the above configuration will be explained.

First, I will explain the paving work. Mixed material from Hoppa H is sent to the rear side of the vehicle body 1, and is spread over a predetermined pavement width by a screed S.
is moved up and down to set a predetermined pavement thickness M as shown in FIG.

At this time, it is necessary to change the height L of the screed S depending on the above-mentioned pavement thickness M and control the positional relationship with the tip of the screed D to obtain a good paved surface. Therefore, as shown in FIGS. 4A and 4B, the height L of the screw S is changed by telescopically operating the hydraulic cylinders 13 and 13 to move the rear part of the vehicle body 1 up and down. That is, when raising the vehicle height, the rod heads 13b of the hydraulic cylinders 13, 13 are extended, and the crank 14 is forcibly rotated counterclockwise in the drawing around the fulcrum pin 15, thereby lowering the unit frame 10 and wheels 12, 12.
By pushing down along the elongated hole 11 relative to the mounting fulcrum shaft 9 against the vehicle weight, the rear of the vehicle body 1 is raised, and the height of the screw S is changed from the standard height L to a predetermined height L2. increase to When lowering the vehicle height, conversely, the rod head 13b is retracted and the crank 14 is turned clockwise in the drawing.

Therefore, as described above, by adjusting the height of the screed S and the height of the screed D in conjunction with the adjustment of the vehicle height, the positional relationship between the two can always be maintained optimally as shown in FIG.

Further, during paving work, as shown in FIG. 7, the road surface G may be uneven and the vehicle body 1 may be tilted, making it impossible to equalize the load on the left and right sides. Therefore, for example, when the right side is higher than the left side, the load borne by the hydraulic cylinder 13 of the right traveling device 8 becomes higher, so that the hydraulic oil from the right hydraulic cylinder 13 is transferred to the hydraulic cylinder 13 of the left traveling device 8 through the pipe P1. It will be sent through. As a result, the right hydraulic cylinder 13 is contracted and the left hydraulic cylinder 1
3 is extended, and the wheels 12, 12 of the left unit frame 10 are lowered relative to the mounting fulcrum shaft 9, and conversely, the wheels 12, 12 of the right unit frame 10 are raised. The loads on the hydraulic cylinders 13, 13 become equal, and the left and right wheels 12, 12 are reliably grounded via the crawlers 4, 4 according to the undulations of the respective road surfaces G. Further, when the right side of the vehicle body 1 is lower than the left side, the operation opposite to the above is performed and the vehicle body 1 is grounded on the road surface G.

In this way, the hydraulic cylinders 13, 13 of the left and right traveling devices 8, 8 are automatically expanded and contracted according to the irregularities of the road surface G, and the loads on the left and right sides are equalized, and the crawlers 4, 13 of the asphalt finisher are 4
Grounding performance can be ensured.

Furthermore, as shown in Fig. 8, when loading the asphalt finisher after paving work onto the transport vehicle, the hydraulic cylinders 13, 13 are fully extended to raise the height of the screed S and the screed D. Afterwards, by moving the asphalt finisher backwards, the screed S and the screed D can be quickly loaded onto the carriage without hitting the loading platform even if the loading inclination angle θ cannot be made small.

In the embodiment described above, the traveling devices 8, 8 according to the present invention are provided on the left and right rear sides of the vehicle body 1, but the present invention is not limited thereto.As a second embodiment, as shown in FIG. It may be provided in the section. That is, the traveling devices 8, 8 of this invention have a unit frame 1.
Hydraulic cylinder 13 and crank 14 centered on
is unitized and small, and the large hopper H
It can also be easily attached to the left and right front sides of an asphalt finisher equipped with.

Here, the traveling devices 8, 8 of the embodiment of this invention
This has a simple structure in which the unit frame 10 is fitted onto the mounting fulcrum shaft 9 of the vehicle body 1 and secured with the retainers 18, 18, and the hydraulic cylinders 13, 13
Since the cranks 14 and 14 are directly attached to the outer surface 10a of the unit frame 10 instead of the vehicle body 1, the traveling devices 8 and 8 can be made smaller and can be installed in small spaces, and the hydraulic cylinders 13 and The cranks 14, 14 can be inspected and replaced, or the traveling devices 8, 8 themselves can be replaced easily.

In each of the above-mentioned embodiments, the case where the traveling devices 8, 8 are applied to a crawler type traveling device is shown, but it is not limited to crawler type traveling devices, and the wheels 12 can be replaced with tires, and the tires can directly run on the road surface. A tire-type traveling device may also be used. In addition, the traveling device of this invention is not limited to asphalt finishes.
Needless to say, the present invention can also be applied to other leveling machines, other construction machines, and traveling vehicles.

As explained above, in this invention, a unit frame is attached to the mounting fulcrum shaft provided on at least one of the front left and right sides and the rear left and right sides of the vehicle body so as to be movable up and down through long holes. A hydraulic cylinder and a crank are attached to the frame, and one end of the crank is connected with a pin to the tip of the hydraulic cylinder, and an engagement recess is provided at the other end to engage the mounting fulcrum shaft, allowing the hydraulic cylinder to be driven. Therefore, the running wheels of the unit frame are operated up and down via the mounting fulcrum shaft. Therefore, according to the present invention, the unit frame with running wheels can be moved up and down by simply operating the hydraulic cylinder, so the vehicle height can be adjusted, and the load on the left and right sides of the vehicle body can be automatically equalized. Paving work efficiency can be improved. It is small and has a simple structure, so it can be installed even in small spaces, and maintenance and replacement are easy because all major components such as the crank and hydraulic cylinder are integrated into the unit frame. There is an effect that can be done.

[Brief explanation of the drawing]

FIG. 1 is a side view of an asphalt finisher, which is an embodiment of the traveling device according to the invention, and is installed on the left and right rear sides of the vehicle body of a tractor, and FIG. 2 is a plan view showing the traveling device of the asphalt finisher. 3 is an enlarged perspective view of the traveling device, FIGS. 4A and 4B are side views for explaining the structure and operation of the traveling device, and FIG. 5 is a connection diagram of the hydraulic cylinder. Fig. 6 is an explanatory diagram showing the positional relationship between the screed and the screed, Fig. 7 is an explanatory diagram showing the operation of the traveling device on an uneven road surface, and Fig. 8 is an explanatory diagram showing the state in which the asphalt finisher is loaded onto the transport vehicle. The explanatory drawing, FIG. 9, is a side view of an asphalt finisher in which the traveling device of this invention is installed on the left and right front sides of the vehicle body. 1... Asphalt finisher tractor body, 8... Traveling device, 9... Mounting fulcrum shaft, 10
...Unit frame, 11...Elongated hole in unit frame, 12...Rolling wheel as running wheel, 13...
... Hydraulic cylinder as operating means, 14 ... Crank, 15 ... Fulcrum pin, 16 ... Engagement recess, 1
7...Pin.

Claims (1)

[Scope of utility model registration request] A mounting fulcrum shaft 9 having a running wheel and provided on at least one of the left and right front sides and the left and right rear sides of the vehicle body.
A unit frame 10 is attached to the unit frame 10 so as to be movable up and down through a long hole 11, a hydraulic cylinder 13 is attached to this unit frame 10, and a hydraulic cylinder 13 is attached to the unit frame 10 via a fulcrum pin 15 so as to be rotatable, and one end is attached to the unit frame 10 via a fulcrum pin 15. A crank 14 is connected to the hydraulic cylinder 13 with a pin 17 and an engagement recess 16 formed on the other end is engaged with the mounting fulcrum shaft 9. Above mounting fulcrum shaft 9
A traveling device such as an asphalt finisher, characterized in that the traveling wheels of the unit frame 10 are operated to move up and down through.