JPH1054009A - Road cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep an engine almost horizontally on turning the direction to make the engine durable, by providing a lifter held almost horizontally on a vehicle by a horizontally holding means and moved up and down by a vertical driving means and arranging an engine and a cutter blade on the lifter. SOLUTION: When turning the direction of a vehicle body 1 in order to change the cutting direction, after the hydraulic cylinder 14 has been stretched to raise a lifter 3 and a cutter blade 8 has been set afloat above the road surface R, a driving control wheel 6 is driven by a hydraulic motor 31 for traveling drive to advance or retract the vehicle body, while appropriately controlling the driving control wheel 6 by rotating a handle 33. In this time, the lifter 3 provided with an engine 15 is raised while it is kept nearly horizontal by a horizontally holding means 10. Accordingly, it is prevented that a lubrication defect arises owing to the deviation of the engine oil in the engine 15. And hence, the durability of the engine is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road surface cutter for cutting a road surface paved with asphalt, concrete or the like.

[0002]

2. Description of the Related Art Conventionally, a road cutter of this type has a structure shown in FIG.
, A front wheel support arm 52a swingably provided vertically below the body 51, a pair of left and right front wheels 52 provided at the front end of the front wheel support arm 52a, , A pair of left and right rear wheels 53 provided near the rear end, a disk-shaped cutter blade 54 provided on a side surface near the front end of the vehicle body 51, and a pair of left and right operating rods extending rearward from the vehicle body 51. 55.
The cutter blade 54 is driven to rotate by pulleys 56 and 57 and a belt 58 by an engine 59 provided inside the vehicle body 51.

FIG. 7 shows a conventional road cutter disclosed in Japanese Utility Model Laid-Open No. 5-7413. This road surface cutter is mounted on a vehicle body 61, a front wheel 62 and a rear wheel 63 provided with a pair of left and right wheels respectively on the vehicle body 61, a movable table 64 provided in front of the vehicle body 61 so as to be vertically movable, and attached to the movable table 64. The movable table 64 is moved up and down via the cutting hydraulic motor 65 provided, the disk-shaped cutter blade 66 fixed to the rotating shaft of the cutting hydraulic motor 65, and the screw shaft 67 arranged in the vertical direction. Elevating hydraulic motor 68
, A steering hydraulic motor 69 connected to a steering mechanism (not shown) of the rear wheel 63, and a traveling drive hydraulic motor 70 for driving the rear wheel 63. An engine 71 and a hydraulic pump 72 driven by the engine 71 are provided inside the vehicle body 61, and the hydraulic motors are configured to rotate by the energy of hydraulic pressure supplied from the hydraulic pump 72. .

[0004]

However, the conventional road surface cutter has the following problems. That is, in the road cutter shown in FIG. 6, the direction of the vehicle body 51 is changed from a state in which the front wheel support arm 52a is swung downward to lift the cutter blade 54 from the road surface as shown in FIG. This is performed by applying a lateral force to the operating rod 55 while pushing down the rear end of the 55 to lift the front wheel 52 from the road surface, thereby turning the vehicle body 51 around the rear wheel 53. Therefore, the vehicle body 51 and the engine 59 are tilted at the time of turning, and the engine 59
The engine oil inside was uneven, which resulted in poor lubrication and shortened the life of the engine 59. In addition, a great deal of labor is required for the operation for changing the direction, and the operator often hurt the lower back due to the operation at the middle hip.

On the other hand, in the road cutter shown in FIG. 7, the direction of the vehicle body 61 is changed while the movable platform 64 is raised by the hydraulic motor 68 for lifting and the cutter blade 66 is lifted off the road surface. Although the vehicle body 61 does not lean, the power of the engine 71 is transmitted to the cutter blade 66 via the hydraulic pump 72 and the cutting hydraulic motor 65, so that the power transmission from the engine 71 to the cutter blade 66 is performed. There was a problem that the loss was large. In such a road cutter, since the relative positional relationship between the engine 71 and the cutter blade 66 changes as the cutter blade 66 moves up and down,
It has been difficult to use a transmission having a small transmission loss, such as a belt or a gear, for the transmission from the engine 71 to the cutter blade 66.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and can maintain the engine substantially horizontal even in a change of direction to extend the life of the engine. It is an object of the present invention to provide a road cutter capable of keeping a relative positional relationship with a blade constant and easily using a transmission device with a small transmission loss such as a belt or a gear. Another object of the present invention is to provide a road cutter capable of easily changing its direction in a small space.

[0007]

In order to achieve the above object, the present invention provides a vehicle body running on a road surface, an engine provided on the vehicle body, and a disk-shaped member driven by the engine to cut the road surface. A road surface cutter provided with a cutter blade, wherein the vehicle body is provided with an elevating portion that is held substantially horizontally by horizontal holding means and is moved up and down by an up-and-down driving device, and the engine and the cutter blade are arranged in the elevating portion. The configuration is as follows.

In the above structure, a pair of fixed wheels, a drive steering wheel, and a rotatable caster wheel are provided below the vehicle body.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A road cutter according to an embodiment of the present invention will be described below with reference to FIGS. In the figure,
The vehicle body of the road cutter generally designated by reference numeral 1 is composed of a base 2, a lift 3, and a travel drive 4.
As shown in FIG. 3, a pair of left and right fixed wheels 5, 5, a drive steering wheel 6, and a caster wheel 7 are disposed at four corners of the vehicle body 1, and a disk is provided near the front end of the right side surface of the vehicle body 1. A cutter blade 8 is provided.

The base 2 is formed in a shallow box shape, and the fixed wheels 5 and 5 are provided at a lower portion near a front end thereof. The left and right fixed wheels 5, 5 are independently rotatable independently, but their rotation axes are fixed in the width direction of the vehicle body 1 so that they do not turn, that is, the directions of the wheels do not change. It is configured.

A horizontal holding means 10 is provided between the base portion 2 and the elevating portion 3 above the base portion 2. 2 and 5
As shown in FIG. 2, the horizontal holding means 10 includes a pair of right and left swing arms 11, 11 and swing arms 12, 12. The front ends of the swing arms 11 and 11 are pivotally supported by the base 2, and the front ends of the swing arms 12 and 12 are swingably supported by the elevating unit 3. The left and right swing arms 11, 11 are connected to each other by a connecting rod 11a, and the left and right swing arms 12, 12 are connected to each other by a connecting rod 12a, so that they swing together.

The swing arms 11, 11 and the swing arm 1
As shown in FIG. 2, the parts 2 and 12 cross each other in an X-shape when viewed from the side, and are pivotally connected to each other by a pivot 13 that penetrates the intersection in the width direction of the vehicle body 1. Rollers 11b, 11b are provided at the rear ends of the swing arms 11, 11, and rollers 12b, 12b are provided at the rear ends of the swing arms 12, 12.
The rollers 11b, 11b are provided on the lower surface 3a of the elevating unit 3, and the rollers 12b, 12b are provided with guide plates 2a,
It is in rolling contact with the lower surface of 2a along each surface.

Hydraulic cylinders (an example of vertical drive means) 14, 14 are provided with their cylinder-side ends connected to the base 2 and their piston rod-side ends connected to a pivot shaft 13. Have been. Therefore, the hydraulic cylinder 1
With the expansion and contraction of the four and fourteen, the elevating part 3 moves up and down while being held substantially horizontally by the horizontal holding means 10.

As shown in FIG. 2, an engine 15 and a hydraulic pump 19 driven by the engine 15 via pulleys 16, 17 and a belt 18 are provided inside the elevating section 3. A blade shaft 21 including the cutter blade 8 and the pulley 20 is pivotally supported at the front end of the elevating unit 3 (see FIG. 3), and the pulley 16, the belt 22, the relay pulley 23, the belt 24, and the pulley 20 are interposed therebetween. Thus, the engine 15 is driven to rotate. A blade cover 25 that covers the upper half of the cutter blade 8 and a hydraulic pressure take-out port 26 for taking out the hydraulic pressure of the hydraulic pump 19 to the outside are provided on the right side surface of the elevating unit 3.

The traveling drive unit 4 is connected to the rear of the base unit 2. That is, the connecting shaft 27 extends rearward from the center of the rear end face of the base 2, and the connecting shaft 27 is fitted into bearings 28, 28 fixed to the traveling drive unit 4 to be pivotally supported. . Thereby, the base unit 2 and the traveling drive unit 4
Is connected rotatably about the horizontal axis of the connection shaft 27.

The drive steering wheels 6 and the caster wheels 7 are provided below the traveling drive unit 4. As shown in FIG. 4, the drive steering wheel 6 is pivotally supported via a bracket 30 at a lower end of a steering shaft 29 vertically provided inside the traveling drive unit 4. The traveling drive hydraulic motor 31 attached to the bracket 30 is driven to rotate via a pair of bevel gears 32.

A handle 3 is provided on the upper surface of the traveling drive unit 4.
A sprocket 35 fixed to the lower end of a handle shaft 34 extending downward from the handle 33 and a sprocket 36 fixed to the steering shaft 29.
When the steering wheel 33 is turned, the steering shaft 29 is rotated, and the drive steered wheels 6 are steered. A driver's seat 38 is formed in the traveling drive unit 4, and an operator stands from the driver's seat 38 in a standing posture.
Etc. can be operated.

The caster wheel 7 is provided at the lower end of a turning shaft 39 vertically provided below the driver's seat 38 so as to be turnable around the vertical axis of the turning shaft 39, and is similar to casters such as office chairs. In addition, the direction of the wheels can be freely changed according to the moving direction.

It is needless to say that the hydraulic cylinder 14 and the traveling drive hydraulic motor 31 are connected to the hydraulic pump 19 and are operated by the hydraulic pressure from the hydraulic pump 19.

In the road cutter constructed as described above, when the hydraulic cylinder 14 is contracted and the elevating unit 3 is lowered as shown in FIG. Cuts the road surface R along the traveling direction of the vehicle body 1 by driving the drive steering wheels 6 by the traveling drive hydraulic motor 31 to advance the vehicle body 1 at a predetermined speed because the road surface R bites into asphalt or concrete on the road surface R. Can be.

At this time, since the cutter blade 8 is driven by the engine 15 via a pulley and a belt, the engine 15 and the cutter blade 8 are compared with a conventional road surface cutter in which the cutter blade is rotated by a hydraulic motor. The transmission loss between the two can be reduced, and the road surface R can be cut more efficiently by using the engine 15 having the same output as the conventional one.

The base 2 having the fixed wheels 5 and 5 and the traveling drive 3 having the drive steering wheels 6 and the caster wheels 7 are connected to be rotatable about the axis of a connection shaft 27. Therefore, for example, when the drive steering wheel 6 rides on a protrusion on the road surface R, only the traveling drive unit 3 leans to the left when viewed from behind the vehicle body 1. Therefore, even if the road surface R has irregularities, none of the fixed wheels 5, 5, the drive steered wheels 6, or the caster wheels 7 is lifted off the road surface R, and the grounding of the wheels is good and the running state is stable. Therefore, the cutting accuracy of the road surface R is good, and the structure of the road surface cutter is simpler than the case where a suspension mechanism that allows the vertical movement of the wheels is used.

In order to change the direction of the vehicle body 1, for example, to change the cutting direction, the hydraulic cylinder 14 is extended to elevate the elevating unit 3 as shown in FIG. After being lifted, the steering wheel 6 is driven by the traveling drive hydraulic motor 31 to move the vehicle body 1 forward or backward while turning the steering wheel 33 to appropriately steer the drive steering wheel 6.

At this time, the elevating section 3 equipped with the engine 15 rises while being held substantially horizontally by the horizontal holding means 10, so that the vehicle body is tilted and the front wheels are lifted to change the direction as in a conventional road surface cutter. In addition, the engine oil in the engine is not biased, causing poor lubrication, and the life of the engine 15 can be extended.
Since the operator only needs to turn the handle 33, the labor required for the operation for changing the direction is small.

If the drive steering wheel 6 is steered so as to be parallel to the width direction of the vehicle body 1 and the drive steering wheel 6 is driven in this state, the vehicle body 1 can be turned almost at the same place. The direction can be changed in a narrow space as compared with a so-called riding-type road cutter in which two of the four wheels are steered similarly to a passenger car.

Further, since hydraulically operated road construction equipment such as a sander, breaker, core drill, and winch can be connected to the hydraulic extraction port 26 and used, another hydraulic pump for operating the equipment at the construction site can be used. It is very convenient to bring your own.

It is needless to say that the road surface cutter according to the present invention is not limited to the one described above. For example, the elevating part is supported by being screwed with a plurality of threaded rods arranged in the vertical direction. By rotating the screw rod in the same direction and at the same speed, the vertical movement may be performed while the lifting unit is held substantially horizontally.

[0028]

As described above, according to the road cutter of the present invention, the vehicle body is provided with an elevating part which is held substantially horizontally by the horizontal holding means and is moved up and down by the vertical driving means. Since the engine and cutter blade are arranged, the engine is kept substantially horizontal even when the cutter blade floats off the road surface and changes direction, preventing poor lubrication due to uneven engine oil Longer life, and the engine and cutter blade move up and down together,
Since the relative positional relationship between the engine and the cutter blade does not change as the cutter blade moves up and down, a transmission device with a small transmission loss, such as a belt or gear, can be easily installed between the engine and the cutter blade. And a road surface can be cut more efficiently by using an engine having the same output as a conventional road surface cutter in which a cutter blade is rotated by a hydraulic motor.

Further, in a vehicle equipped with a pair of fixed wheels, a drive steering wheel, and a rotatable caster wheel at a lower portion of the vehicle body,
For example, if the steering wheel is steered and driven in a direction parallel to the width direction of the vehicle body, it is possible to turn the vehicle body almost at that location, and if two of the four wheels are to be steered, The direction can be changed in a relatively small space, and the operation for changing the direction can be performed with extremely little labor as compared with a conventional road cutter in which the vehicle body is turned by a human operator.

[Brief description of the drawings]

FIG. 1 is a side view of a road surface cutter according to an embodiment of the present invention.

FIG. 2 is a side view of the road surface cutter in a state where the cutter blade is floating from the road surface.

FIG. 3 is a plan view of a road cutter showing an arrangement of fixed wheels, drive steering wheels, and caster wheels.

FIG. 4 is a rear view of the driving unit, which is partially cut away.

FIG. 5 is a plan view of a base showing the horizontal holding means in the state of FIG. 2;

FIG. 6 is a side view of a road surface cutter according to a conventional example.

FIG. 7 is a side view of a road surface cutter according to another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body 3 Elevating part 5,5 Fixed wheel 6 Driven steering wheel 7 Caster wheel 8 Cutter blade 10 Horizontal holding means 14 Hydraulic cylinder (vertical drive means) 15 Engine

Claims (2)

[Claims] 1. A road surface cutter comprising: a vehicle body traveling on a road surface; an engine provided on the vehicle body; and a disk-shaped cutter blade which is rotationally driven by the engine and cuts the road surface. A road cutter comprising: a lifting unit that is held substantially horizontally by a holding unit and is moved up and down by a vertical driving unit; and the engine and the cutter blade are arranged in the lifting unit. 2. The road surface cutter according to claim 1, further comprising a pair of fixed wheels, a drive steering wheel, and a rotatable caster wheel provided at a lower portion of the vehicle body.