JP2000008414A - Excavation working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the end of a swivel base from clashing against obstacles in the case side ditch excavation work or wall side excavation work is carried out. SOLUTION: An excavation section is swung to the maximum in one direction and, at the same time, a swivel base is swung in the opposite direction against the swing direction. In that case, a locus of the rear end of the swivel base is included between a virtual extension line (a) parallel to the outside end of a traveling section 1 and outside end of the traveling section 1 through the outside end of the front end of the excavation section in a state to approximately parallel the extended direction and the outside end of the traveling section 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavator.

[0002]

2. Description of the Related Art Conventionally, as one form of an excavating work vehicle, a base is erected between a pair of right and left crawler traveling parts, a turntable is mounted on the base, and a front end of the turntable is mounted on the base. In some cases, an excavation unit is mounted and an operation unit and a motor unit are provided on a swivel base.

[0003] For example, when performing a gutter excavation work, the swivel is swiveled in a desired direction to the left or right,
By arranging the excavation part above the gutter excavation position, the excavation part can be operated to perform the above operation.

[0004]

However, in the above-mentioned excavation work vehicle, in a narrow place or a place such as a wall where obstacles such as the body can barely enter, the vehicle is brought close to the wall or the like to excavate the gutter. When the work must be performed, when turning the turntable after excavation and throwing out soil, the rear end corner of the turntable may collide with a wall or the like, so that the turntable cannot be turned. In some cases, gutter excavation work cannot be performed.

[0005]

Therefore, according to the present invention, a base is erected between a pair of right and left crawler-type traveling parts, a turntable is mounted on the base, and a turntable is mounted on the front end of the turntable. The excavator can be swingably mounted, and the excavator equipped with a driving unit and a motor unit on the swivel base allows the excavator to swing to the maximum extent in one direction and turns the swivel base in the opposite direction to the swing direction. Then, in a state where the extension direction of the excavation part and the outer end of the traveling part are substantially parallel, a virtual extension line parallel to the outer end of the traveling part through the outer end of the tip part of the excavation part, It is an object of the present invention to provide an excavation work vehicle characterized in that a turning locus of a rear end of a swivel table is inserted between the excavating work vehicle and an outer end of the traveling section.

The present invention also has the following configuration.

The fulcrum of attachment of the excavation part to the swivel base is arranged near the turning locus at the rear end of the swivel base.

The turntable forms left and right straight surfaces parallel to the front-rear direction on the left and right sides when facing the front, and the left and right straight surfaces are more inward than the outer ends of the left and right traveling units. It was located in.

[0009] The rear end surface of the swivel base has an arc surface formed along substantially the same circumference around the center of rotation.

The base end of the excavation portion is attached to the front end surface of the swivel so as to be deviated to one of left and right with respect to an imaginary center line extending in the front-rear direction of the swivel, and the excavation portion is moved in the left-right direction. Swing freely, and the swing angle of the excavated portion in the left-right direction is set so that the tip of the excavated portion has substantially the same offset width in the left-right direction with respect to the virtual center line.

[0011] A driver's seat is provided in the driver, and the driver's seat is arranged such that the turning center of the turntable falls within the projected area thereof.

[0012]

Embodiments of the present invention will be described below.

That is, as a basic structure of the excavating work vehicle according to the present invention, a base is erected between a pair of right and left crawler traveling parts, and a turntable is mounted on the base. An excavation unit is attached to the front end of the vehicle, and an operation unit and a motor unit are provided on the swivel.

The excavator has a characteristic structure in which the excavator is swung in one direction to the maximum and the swivel base is turned in a direction opposite to the swing direction.
With the extension direction of the excavation portion and the outer end of the traveling portion being substantially parallel to each other, a virtual extension line passing through the outer end of the tip portion of the excavation portion and parallel to the outer end of the traveling portion; Between the rear end of the turntable and the outer end of the turntable.

[0015] In this way, when it is necessary to perform the gutter excavation work by bringing the vehicle body close to the wall or the like, when the swivel is turned and the soil is removed, the rear end corner of the swivel is set to the wall. There is no collision.

Therefore, the excavation work efficiency can be improved even in a narrow place or a place such as a wall where the vehicle body can barely enter.

In addition, since the swivel base can be formed as large as possible, the stability of the machine body can be ensured well and the livability of the operator can be ensured well.

The fulcrum for mounting the excavation part on the swivel base is as follows:
It is located near the turning trajectory at the rear end of the turning table.

In this way, the excavated portion can be turned compactly without colliding with another object in the turning locus at the rear end of the turntable, and can be used even in a work site having a narrow space or an obstacle. Excavation work can be performed efficiently.

Further, the turntable forms left and right straight surfaces parallel to the front-rear direction on the left and right sides in a state facing the front, and the left and right straight surfaces are formed to be wider than the outer ends of the left and right running parts. It is located inside.

In this manner, the vehicle body can be entered at least in a narrow place wider than the outer end width of the left and right traveling portions, and the movement performance of the vehicle body can be improved.

The rear end face of the swivel table is formed as an arc surface formed along substantially the same circumference with the center of rotation as the center.

In this manner, the rear portion of the swivel base can be extended rearward as much as possible while ensuring good swivelability, and a large living space for the operator can be ensured. Thus, the stability of the vehicle body can be improved.

Further, the base end of the excavation part is attached to the front end face of the swivel table so as to be deviated to one of left and right with respect to a virtual center line extending in the front-rear direction of the swivel base.

In this way, the excavating section does not hinder the operator's view even during the front excavation work, and as a result, the excavation work efficiency can be improved.

Further, the excavated portion can swing freely in the left-right direction, and the swing angle of the excavated portion in the left-right direction is such that the tip end of the excavated portion has substantially the same offset width in the left-right direction with respect to the virtual center line. It is set to be.

In this manner, when performing the gutter excavation work, the excavation part can be evenly offset in both the left and right directions, so that the gutter excavation work can be performed efficiently from both the left and right directions. In addition, the swivel base can be swung without causing the rear end of the swivel base to collide with an obstacle such as a wall body, and the excavation work efficiency can be improved.

A driver's seat is provided in the driver, and the driver's seat is arranged so that the center of rotation of the turntable falls within its projected area.

In this manner, even when the swivel base is frequently turned, the operator is substantially seated at the center of the swivel base and does not swing greatly on the swivel base.
As a result, operability can be improved with less fatigue of the operator.

[0030]

Embodiments of the present invention will be described below with reference to the drawings.

A shown in FIGS. 1 to 3 is an excavating work vehicle according to the present invention. The excavating work vehicle A has a base 2 erected between a pair of right and left crawler-type traveling units 1 and 1, A swivel base 3 is mounted on the base 2, and a digging part 4 is mounted on a front end of the swivel base 3, and an operating unit 5 and a motor unit 6 are provided on the swivel base 3, and A discharging part 7 is attached.

As shown in FIGS. 4 to 6, the traveling unit 1
A traveling hydraulic motor M is attached to a front end of the traveling frame 10 extending in the front-rear direction, and a driving wheel 11 is attached to an output shaft of the traveling hydraulic motor M via a speed reducer 12, while a rear end of the traveling frame 10 is attached. Attach the idler wheel 13, wind the crawler belt 14 between the two wheels 11, 13, and place the rolling wheels 15, 15,
15 is installed.

As shown in FIGS. 4 to 6, the base 2 is formed of a rectangular frame-shaped support frame 20 and a base body 21 mounted on the support frame 20.

The support frame 20 is formed of a rectangular cylindrical front and rear slide guides 22 extending in the left-right direction, and connecting members 23 connecting the left and right sides of the slide guides 22, 22. Two
3 to form a rectangular frame in plan view.

The base main body 21 is formed in a rectangular cylindrical shape, and the lower ends of the front and rear walls 21a, 21a are positioned at the lower front and rear sides.
Each of the front and rear walls 21a, 21a is formed into a front-rear partition 21b, 21b, and the lower end of each of the front and rear walls 21a, 21a is formed into a front-rear partition 21b. Front and rear slide spaces 24, 24, 25, 25 are formed in the front and rear slide guide bodies 22, 22 by the front and rear slide guides 22, 22, respectively.

The front and rear slide spaces 24, 24, 2
Inside 5,25, a pair of front and rear slide supports 26,26,27,27, which extend in the width direction of the left and right running frames 10,10 in the left-right width direction and face inward, are slidable. , And each slide support 26, 26, 27, 27 is formed in a square tubular shape.

In addition, the expansion / contraction change cylinder 28 is laid across the center between the left and right traveling frames 10 and 10 via the brackets 29 and 30, and the cylinder 28 is extended and contracted, so that the left and right traveling frames are moved. The interval between the parts 1 and 1 can be changed in scale. 31 is an expansion / contraction guide body, 32 is an expansion / contraction guide hole, and 33 is an expansion / contraction guide pin.

In this way, the front and rear slide spaces 24, 2
The slide supports 26, 26, 27, 27 inserted into 4, 25, 25
As shown in FIG. 7, rectangular front and rear slide guides 22, 22 and front and rear partition walls 21b, 21b provided in the slide guides 22, 22 have upper and lower front and rear surfaces, which are peripheral surfaces. Abuts and is reliably slid and guided without generating play, regardless of the slide position, to sufficiently exhibit the support function of the traveling portions 1 and 1.

Moreover, since the left and right ends of the slide guides 22, 22 are open, the left and right slide supports 26, 2
6, 27, 27 slides inside the slide guides 22, 22, respectively, and even if mud or the like enters the slide guides 22, 22, the mud, etc. Discharged from one side edge of the slide support 26, 2
6, 27, 27 does not hinder slide sliding, and as a result, slide sliding of each slide support 26, 26, 27, 27 can be ensured satisfactorily.

The mud, etc., staying in the slide guides 22, 22 can be easily discharged from the openings of the slide guides 22, 22.

A ring gear support 46 is provided on the ceiling of the base 2.
Is mounted on the ring gear support 46, and the external ring gear 40 for rotation is mounted on the ring gear support 46.
The swivel 3 is mounted on the swivel ring 41 with a plurality of balls 42 interposed therebetween, and the swivel drive motor 43 is mounted on the swivel 3 at a position separated from the swivel center position. And a pinion gear 45 is attached to the output shaft 44 of the turning drive motor 43.
And attach the pinion gear 45 to the external ring gear 40
Is engaged.

As described above, the rotation drive motor 43 is driven so that the pinion gear 45 revolves around the outer circumference of the external gear ring gear 40, whereby the turntable 3 can be rotated integrally with the pinion gear 45.

At this time, since the turning drive motor 43 is disposed at a position separated from the turning center position, the engine E of the prime mover unit 6 interferes with the motor 43 at the turning center Z position. The motor unit 6 and the operating unit 5 can be compactly arranged on the swivel 3.

A swivel joint 50 is provided at the turning center Z position of the swivel base 3.
The engine E of the prime mover unit 6 is disposed immediately above the engine.

In this manner, the position of the center of rotation Z and the position of the center of gravity of the upper body (the swivel 3 and the motor unit 6 disposed on the swivel 3 and the like) on the base 2 are substantially matched. As a result, the weight balance of the body can be improved, and as a result, the excavation work efficiency can be improved, and the running stability can be improved.

As shown in FIG. 2, the swivel base 3 has right and left straight surfaces 52, 52 parallel to the front-rear direction on the left and right sides when facing the front. , 52 are positioned more inward than the outer ends b, b of the left and right running parts 1, 1.

For this purpose, at least the right and left traveling parts 1, 1
In a narrow place wider than the outer end width of the vehicle, the vehicle body can be entered, and the moving performance of the vehicle body can be improved.

In addition, the rear end face 53 of the swivel base 3 has substantially the same circumference with a radius r around the center of rotation Z, that is, an arc surface formed along the swirl locus Q.

For this reason, the rear portion of the swivel base 3 can be extended rearward as much as possible while ensuring good swivelability, and a large living space for the operator can be ensured.

As shown in FIG. 2, a stay 60 is provided on the front end 51 of the swivel base 3 so as to project forward.
A swing bracket 61 is pivotally supported on the swing bracket 61 by a pivot 62 whose axis is oriented vertically, and a swing cylinder (not shown) is interposed between a right wall of the swing bracket 61 and a right halfway portion of the swivel 3. The swing bracket 61 can swing in the left and right directions in conjunction with the expansion and contraction operation of the swing cylinder.

Further, the stay 60 is provided at the front end face of the swivel 3.
51 is attached to the swivel 3 so as to be deviated rightward with respect to a virtual center line C extending in the front-rear direction.

Therefore, even during the front excavation work, the excavation section 4 does not hinder the operator's view, and as a result, the excavation work efficiency can be improved.

Further, the axis of the pivot 62 (the fulcrum of attachment of the excavating part 4 to the swivel base 3) is arranged near the turning locus Q on the stay 60.

Therefore, the excavation portion 4 can be turned compactly without colliding with another object in the turning locus Q at the rear end of the turntable 3, and can be used even in a narrow place or an obstacle work site. Excavation work can be performed efficiently.

As shown in FIG. 1, the excavating portion 4 pivotally supports the base end of the boom 64 to the swing bracket 61 via a pivot pin 65, and the base end of the arm 66 is connected to the distal end of the boom 64. The arm 66 is pivotally supported via a pivot pin 67, and a bucket 68 is pivotally supported at the distal end of the arm 66 via a pivot pin 69. 70 is a boom cylinder, 71 is an arm cylinder, and 72 is a bucket cylinder.

Then, the excavating part 4 is swung to the maximum in one direction, and the swivel base 3 is swiveled in the direction opposite to the swing direction, so that the extending direction of the boom 64 of the excavating part 4 and the outer end of the traveling part 1 are adjusted. b in the same bucket
The turning trajectory Q of the rear end face 53 of the swivel 3 is located between an imaginary extension line a parallel to the outer end b of the running section 1 through the outer end of the running section 68 and the outer end b of the running section 1. I am trying to enter.

Therefore, when it is necessary to perform the gutter excavation work by bringing the vehicle body close to the wall 55 or the like, when the swivel 3 is turned and discarded, the rear end face portion 53 of the swivel 3 is placed on the wall 55.
It does not collide with 55 mag.

As a result, the excavation work efficiency can be improved even in a narrow place or a place such as a wall where the vehicle body can barely enter.

Further, since the swivel base 3 can be formed as large as possible, the stability of the machine body can be ensured well and the livability of the operator can be ensured well.

As shown in FIG. 3, the maximum swing angle θ1 to the right and the maximum swing angle θ2 to the left
Is set so that the outer end of the bucket 68 has substantially the same offset width W in the left-right direction with respect to the virtual center line C.

As shown in FIGS. 1, 2 and 8, the operating unit 5 has a lever stand 75 erected at the front of the swivel 3 and a steering operation lever 76, 77, projecting upward, and various working unit operating levers 78, 79 projecting upward from the upper part of the rear wall of the lever stand 75, and immediately behind these levers 76, 77, 78, 79. Position and
The driver's seat 80 is placed on the motor unit 6.

Further, the driver's seat 80 is disposed immediately above the turning center Z of the turning table 3.

Therefore, even when the swivel base 3 is frequently turned, the operator is not substantially swung on the swivel base 3 in a state of being substantially seated at the center position of the swivel base. And the operability can be improved.

As shown in FIGS. 1 and 2, the engine unit 6 has an engine E mounted on a turning center Z of the swivel 3 and covers the engine E with a bonnet 82.

As shown in FIGS. 1 and 2, the discharging portion 7
The base ends of a pair of left and right discharging arms 87, 87 are pivotally supported on the base 2, and a discharging plate 88 is erected between the distal ends of the discharging arms 87, 87. A cylinder 89 for lifting and lowering the earthing plate is interposed between the base and the base 2.

FIGS. 8 and 9 show a digging work vehicle A as another embodiment. The digging work vehicle A has basically the same structure as the digging work vehicle A. , Swivel 3
Are formed symmetrically in a plan view, and a stay 60 is projected on the virtual center line C of the front end face portion 51 of the revolving base 3, and the stay 60 has a base end of the boom 64 of the excavation part 4. Are mounted via a swing bracket 61, and the base end of the boom 64 is disposed on the virtual center line C. In this case, the maximum swing angle θ1 to the right and the maximum swing angle θ2 to the left are the same.

[0067]

According to the present invention, the following effects can be obtained.

According to the first aspect of the present invention, the excavating part is swung to the maximum in one direction, and the swivel is swiveled in the direction opposite to the swing direction, so that the extending direction of the excavating part and the outer end of the traveling part are changed. And in a state where they are substantially parallel to each other, a virtual extension line parallel to the outer end of the traveling portion through the outer end of the tip portion of the excavation portion, and an outer end of the traveling portion, When it is necessary to carry out gutter excavation work by bringing the vehicle body close to a wall or the like because the turning trajectory of the rear end is included, when turning the turntable to remove soil, The end corners do not collide with the wall or the like.

Accordingly, the excavation work efficiency can be improved even in a place where there is an obstacle such as a narrow wall or a wall where the vehicle body can barely enter.

Further, since the swivel base can be formed as large as possible, the stability of the machine body can be ensured well and the livability of the operator can be ensured well.

According to the second aspect of the present invention, since the fulcrum for attaching the excavating portion to the swivel base is located near the swivel locus at the rear end of the swivel base, the fulcrum is located within the swivel locus at the rear end of the swivel base. In, the excavation section can be turned compactly without colliding with another object, and the excavation work can be efficiently performed even in a work site having a narrow place or an obstacle.

According to the third aspect of the present invention, the turntable forms left and right straight surfaces parallel to the front-rear direction on the left and right sides when facing the front, and the left and right straight surfaces are connected to the left and right. Because it is located more inward than the outer end of the running part,
At least in a narrow place wider than the outer end width of the left and right traveling portions, the vehicle body can be entered, and the movement performance of the vehicle body can be improved.

According to the fourth aspect of the present invention, the rear end portion of the swivel base is formed as an arc surface formed along substantially the same circumference around the center of rotation, so that the rear portion of the swivel base is formed. It is possible to protrude as much as possible rearward while maintaining good turning performance, and it is possible to secure a wide living space for the operator.

According to the fifth aspect of the present invention, the base end of the excavation portion is attached to the front end face of the swivel so as to be deviated to one of left and right with respect to a virtual center line extending in the front-rear direction of the swivel. Therefore, the excavating portion does not hinder the operator's view even during the front excavation work, and as a result, the excavation work efficiency can be improved.

Further, the excavated portion can swing freely in the left-right direction, and the swing angle of the excavated portion in the left-right direction is such that the tip end of the excavated portion has substantially the same offset width in the left-right direction with respect to the virtual center line. When performing the gutter excavation work, the excavated part can be evenly offset in both the left and right directions, and the gutter excavation work can be performed efficiently from both the left and right directions. In addition to this, the swivel base can be swung without causing the rear end of the swivel base to collide with an obstacle such as a wall, and the excavation work efficiency can be improved.

According to the sixth aspect of the present invention, the driving section is provided with a driver's seat, and the driver's seat is arranged so that the turning center of the turning table falls within its projected area. Even when turning frequently, the operator is in a state of being substantially seated at the turning center position and is not swung largely on the swivel table. As a result, fatigue of the operator is reduced and operability is improved. be able to.

[Brief description of the drawings]

FIG. 1 is a side view of an excavator according to the present invention.

FIG. 2 is an explanatory plan view of the excavator.

FIG. 3 is an explanatory plan view of the excavator.

FIG. 4 is a plan view of a base.

FIG. 5 is a cross-sectional side view of the base.

FIG. 6 is a sectional front view of the base.

FIG. 7 is an explanatory diagram of enlargement and reduction of a traveling unit.

FIG. 8 is an explanatory plan view of an excavating work vehicle as another embodiment.

FIG. 9 is an explanatory plan view of the excavator.

[Explanation of symbols]

 A Excavation work vehicle 1 Running unit 2 Base 3 Swivel 4 Excavation unit 5 Operation unit 6 Motor unit

Claims (6)

[Claims] 1. A base (2) is installed between a pair of right and left crawler-type traveling parts (1, 1), and a turntable (3) is mounted on the base (2). The excavator (4) is attached to the front end of (3) so that it can swing freely, and the operating unit (5) and the motor unit (6) are installed on the swivel (3). Swing in one direction to the maximum,
Turn the swivel (3) in the direction opposite to the swing direction,
With the extension direction of the excavation part (4) and the outer end of the traveling part (1) being substantially parallel, the outer side of the traveling part (1) is passed through the outer end of the tip of the excavation part (4). Virtual extension line (a) parallel to end (b)
And a turning locus (Q) of a rear end of the turntable (3) is inserted between the excavator and the outer end (b) of the traveling section (1). 2. A fulcrum for attaching the excavating part (4) to the swivel base (3) is arranged near a turning locus (Q) at a rear end of the swivel base (3). Excavator work vehicle. The turning table (3) forms left and right straight surface portions (52, 52) parallel to the front-rear direction on the left and right sides in a state facing the front, and the left and right straight surface portions (52). , 52) with the left and right traveling parts
The excavator according to claim 1 or 2, wherein the excavator is located inside the outer end of (1,1). The rear end portion (53) of the swivel base (3) has a center of rotation.
The excavation work vehicle according to any one of claims 1 to 3, wherein the excavator has an arc surface formed along substantially the same circumference centered on (Z). 5. A digging part (4) on a front end surface part (51) of a swivel base (3).
The base end of the excavation part (4) can be freely swung in the left and right direction while being shifted to the left or right with respect to the virtual center line (C) extending in the front-rear direction of the swivel (3). The swing angle of the digging part (4) in the left-right direction is the same as the offset width (W) of the tip of the digging part (4) in the left-right direction with respect to the virtual center line (C). The excavation work vehicle according to any one of claims 1 to 4, wherein the excavation work vehicle is set to be: 6. A driver's seat (80) is provided in the driver (5), and the driver's seat (80) is arranged so that the turning center (Z) of the turntable (3) falls within its projected area. The excavation work vehicle according to any one of claims 1 to 5, wherein