JPH09165780A - Backhoe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the workability in a limited area with the rear end of a turn table being prevented from projecting beyond the crawler travel devices, and make turning positions recognizable through side edges on the right and the left of the turn table and side edges of an engine cover while making passage easy for a human body when walking through the outside of the side edges of the turn table and the engine cover. SOLUTION: An engine 3 and tanks are mounted on a turn table 1 and surrounded with a cover 28, side edges 20R and 20L on the right and the left are formed at the sides, each running in the longitudinal direction of the turn table 1 when the turn table is positioned to face the front, and the rear end 22 of the turn table 1 is formed in a circular arc shape and prevented from projecting beyond the external side edges 21 of crawler travel devices 5 when the turn table 1 is positioned sideways. The side faces and the rear face of the cover 8 on which an operator's cabin is mounted are made approximately flush with the side edges and the rear end 22 of the turn table 1. Spaces 26 opened in the longitudinal direction and toward the upside are provided at the crawler travel devices 5 on the right and the left on positions respectively between each of the side edges on the right and the left of the turn table 1 being in a position to face the front and each of the sides of the cover 8 and each of the external side edges 21 of the crawler devices 5 on the right and the left.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backhoe in which a turning radius of a rear portion of a turntable is reduced.

[0002]

2. Description of the Related Art A conventional backhoe is shown in FIG.
As shown in FIG. 3, a swivel base 1 ′ is rotatably supported on a traveling machine base having left and right crawler traveling devices 5 ′.
The excavation work device A'is connected to the left and right middle part of the front part of the vehicle, the cockpit 2'is arranged behind the excavation work device A ', and the engine 3'is mounted on the rear part of the swivel base 1'. In general, the engine 3'is mounted with its output shaft core P'along the left-right direction of the swivel base 1 '.

[0003]

In this type of backhoe, it has been required in recent years to improve workability in a narrow space by reducing the turning radius of the rear portion of the swivel base 1 '. In a general swivel base structure, the swivel base 1 ′ has a rear portion which is projected more than the rear parts of the left and right crawler traveling devices 5 ′ as shown in FIG. Then, in the lateral posture, the rear portion projects more than the left and right outer ends of the left and right crawler traveling device 5 ′.

That is, the swivel base 1'has a long length in the front-rear direction, and the turning radius has a shape projecting more than the front and rear ends and the left and right outer ends of the left and right crawler traveling devices 5 '. In a narrow place having substantially the same width as the above, the structure or the like will be obstructed even if it enters, and the swivel base 1 ′ cannot swivel, which makes it difficult to perform excavation work. Further, the cockpit 2'is arranged on the front side of the cover for covering the engine 3 ', and by arranging the cockpit 2'and the engine cover in the front and rear, it is possible to increase the length of the swivel base 1'in the front-rear direction. Moreover, the side edge of the engine cover is along the front-rear direction when the swivel base 1'is in the forward posture, but it is located rearward from the operator, so it is difficult to provide the function of visually confirming the turning posture. It has become.

An object of the present invention is to prevent the trailing edge of the swivel from protruding from the crawler traveling device even when the swivel is swiveled 90 degrees in a horizontal position, and to make the crawler traveling device closer to a structure or the like. Workability in narrow spaces can be improved, and not only the swivel base but also the side edge of the engine cover can have a function of visually observing the turning position. It is an object of the present invention to provide a backhoe that allows a person's upper body to easily pass when a person passes by the left and right side edges of the swivel and the lateral sides of the engine cover.

[0006]

The first specific means for solving the problems in the present invention is a left and right crawler traveling device 5.
A swivel base 1 is rotatably provided on a traveling machine base 4 having an engine 3, a tank is mounted on the swivel base 1, and a cover 2 is provided.
8, the excavation work device A is provided in the front part of the swivel base 1, and the swivel base 1 is formed with left and right side edges 20L, 20R along the front-rear direction when facing forward and the side edge parts 20L, 20L.
When R is in a non-projecting state from the outer end 21 of the left and right crawler traveling device 5 to the left and right outwards, the rear edge portion 22 of the swivel base 1 is formed into an arc shape, and the swivel base 1 is swung 90 degrees in a lateral position, The edge portion 22 is set in a non-protruding state from the outer end 21 of the left and right crawler traveling device 5, the pilot seat 2 is placed on the cover 28, and the side and rear surfaces of the cover 28 are attached to the side edge portion 20 of the swivel base 1.
The left and right crawler traveling devices which are substantially flush with the rear edge part 22 and between the left and right side edge parts 20L and 20R of the swivel base 1 and the side surfaces of the cover 28 and the outer end 21 of the left and right crawler traveling device 5 in the forward posture. 5 has a space 26 open in the front-back direction and in the upward direction.

As a result, even when the swivel base 1 is in the horizontal posture, the rear edge portion 22 and the cover 28 of the swivel base 1 do not project from the outer ends 21 of the left and right crawler traveling devices 5,
The left and right crawler traveling devices 5 can be brought closer to a structure or the like for work, and not only the side edge portions 20L and 20R of the swivel base 1 but also the side surface of the cover 28 are positioned on the side of the cockpit 2 to visually recognize the swivel posture. When the swivel base 1 is in a forward posture even when the swivel base 1 is brought closer to a structure or the like, a person can easily pass the outer edge of the rear edge portion 22 and the cover 28 of the swivel base 1 using the space 26. It will be possible.

A second concrete means for solving the problems in the present invention is the cover 2 in addition to the first concrete means.
8 and the left and right spaces 2 on the upper surface of the swivel 1 in front of the cockpit 2
That is, the step surface 29 leading to 6 is formed.
This allows the operator to move from the step surface 29 through the space 26 to the rear of the swivel base 1.

In addition to the first or second specific means, a third specific means for solving the problems in the present invention is such that the cover 28 is substantially flush with the left and right side edge portions 20L and 20R of the swivel base 1. It has the right and left sides of. by this,
A person's upper body can easily pass through the space 26, and the cover 2
Both left and right side surfaces of 8 serve as a reference for visually recognizing the turning posture of the swivel base 1.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS.
The excavation work device A is connected to the left and right middle portions of the front part of the
A cockpit 2 is disposed behind the excavation work device A, and an engine 3 is mounted on the rear portion of the swivel base 1 to form a backhoe. In addition, 4 is a traveling platform and 5 is a crawler traveling device.

The excavation work apparatus A comprises a boom 6, an arm 7 and a bucket 8. Further, the boom 6 is in a retracted state and is in a backward tilted posture as shown in FIG. 8 is configured to be held inward. The arm 7 of the excavation work device A, as shown in FIG.
A main frame 7A having a U-shaped cross section and an auxiliary frame 7B that closes the open side thereof are welded together.
Both end edge portions 7a of B are bent over the entire length toward the bucket 8 side, and when the bucket 8 and the arm 7 hold and hold timber or large stones, the arm 7 is prevented from bending. , It is constructed so as to prevent slipping of the timber that is held.

As shown in FIG. 5, ribs 7b may be bulged over the entire length of the arm 7 on each of the three sides of the main frame 7A of the arm 7 to further increase the strength of the arm 7. As shown in FIGS. 1 and 2, on the swivel base 1 behind the excavation work device A, the engine 3 is arranged with its output shaft core P extending along the front-back direction of the swivel base 1, and A radiator 9 is arranged on the rear side.

This radiator 9 is of an extrusion type, and discharges air sucked from the front of the machine body through the engine 3 to the rear side, thereby avoiding a temperature rise around the cockpit 2 and accompanying the suction, the excavation work device A The valves 10 arranged at the front of the swivel base 1 for use in the vehicle can be cooled.
Further, as shown in FIG. 2, by utilizing the fact that the engine 3 is arranged in the front-back direction and the radiator 9 is located behind it as described above, the output shaft of the comparatively low output shaft on the opposite side is utilized. Pumps 11 for the end and the excavation work equipment A attached to the end 11
Is made to enter below the cockpit 2 and the required installation length for various devices in the front-back direction in the swivel base 1 is reduced to shorten the turning radius, and as a result, as shown in FIG. The swivel base 1 is prevented from projecting laterally of the crawler traveling device 5 at the time of turning to improve workability in a narrow space.

Further, as shown in FIG. 1, the front and rear lengths of the swivel base 1 are utilized by taking advantage of the fact that the engine 3 is placed vertically on the left and right sides of the engine 3 so that a relatively large space is provided. The large-capacity fuel tank 12 and the hydraulic oil tank 13 are distributed and arranged without increasing the fuel consumption. That is,
In view of the fact that not all the engines 3 are bulky uniformly, but the bulk changes in particular along the output shaft core P, the engine 3 is arranged with the output shaft core P extending along the front-back direction of the swivel base 1. ,
By disposing the radiator 9 at the rear of the engine 3, a relatively bulky radiator 9 and a subsequent bulky portion of the center of the engine 3 except for a relatively bulky radiator 9 such as an output shaft end portion and a pump portion attached thereto are relatively bulky. It is possible to let the lower part go under the cockpit 2 so that the length of the swivel base 1 in the front-rear direction can be shortened as much as possible. By allocating the fuel tank 12 and the hydraulic oil tank 13 separately to each other, both tanks of relatively large capacity can be compactly mounted on the swivel base 1 without increasing the installation area of the swivel base 1 in the front-rear direction. It is possible.

This makes it possible to allow a part of the engine 3 to enter the lower portion of the cockpit 2 to shorten the size of the swivel base 1 in the front-rear direction, but to avoid the trouble of mounting tanks. As a whole, the turning radius of the swivel base 1 is further reduced to improve workability in a narrow space. The backhoe will be described in more detail with reference to FIGS.

A swivel base 1 is rotatably mounted on a traveling machine base 4 having a left and right crawler traveling device 5, and an excavation work device A is swingably mounted on the front part of the swivel base 1 via a pivot 25. There is. The swivel 1 has side edges 20 that are substantially parallel to each other on the left and right.
L and 20R are formed, and the side edge portions 20L and 20R are formed.
2 is in a state in which it does not project leftward or rightward from the outer end 21 of the left and right crawler traveling device 5 (non-projected state) along the front-rear direction in the forward facing posture of FIG. The side edge portion 20
The operator can visually recognize the turning posture of the swivel base 1 from above the cockpit 2 depending on the angle formed by L and 20R with a structure or the like (buildings, walls, banks, etc.).

In the swivel base 1, the rear edge portion 22 of the rear part is formed in an arc shape, and the swivel base 1 is swung 90 degrees from the forward facing posture.
3 in a horizontal posture, the rear edge portion 22 is in a non-projecting state from the outer end 21 of the left and right crawler traveling device 5 (in FIG. 3, the outermost end of the arcuate rear edge portion 22 of the swivel base 1 is located outside the crawler traveling device 5). The end 21 is shown in a state where it substantially coincides with the end 21). The rear edge portion 22 has the left and right crawler traveling devices 5
By not projecting from the outer end 21 of the crawler traveling device 5, the crawler traveling device 5 can be brought closer to a structure or the like in a lateral posture in which it is turned 90 degrees, and workability in a narrow space can be improved.

When the swivel base 1 is placed in a horizontal posture,
The pivot portion 25 is also in a non-projecting state from the outer end 21 of the left and right crawler traveling device 5 to the left and right outward. The swivel base 1 has a rear edge portion 22 having an arc shape in a plan view, but has a substantially polygonal shape having side edge portions 20L and 20R that are substantially parallel to each other on the left and right sides and extend in the front-rear direction. At times, the pivot portion 25 is located inside the outer end 21 of the crawler traveling device 5.

As a result, not only the front edge portion 23 but also the substantially entire length of the swivel base 1 from the pivotal support portion 25 to the arcuate rear edge portion 22 is substantially contained within the range between the outer ends 21 of the left and right crawler traveling devices 5. The left and right crawler traveling devices 5 can both come closer to the structure or the like, workability in a narrow space can be improved, front-rear balance is good, and stability can be improved. Looking at the relationship between the swivel base 1 and the crawler traveling device 5 in the forward posture of FIG. 1, the side edge portions 20L and 20R of the swivel base 1 are located inward of the center of the width 27 of each of the left and right crawler traveling devices 5. The left and right side edge portions 20L, 20R of the swivel base 1 and the outer ends 21 of the left and right crawler traveling devices 5 are formed with spaces 26 open in the front-rear direction and the upper direction on the left and right crawler traveling devices 5. doing.

The engine 3, the fuel tank 12, the hydraulic oil tank 13 and the like mounted on the swivel 1 are surrounded by a cover 28, and the cockpit 2 is mounted on the cover 28. The left and right side surfaces and the rear surface of the cover 28 are substantially flush with the left and right side edge portions 20 and the rear edge portion 22 of the swivel base 1, respectively, and the left and right side edge portions 2 of the swivel base 1 in the forward posture.
The space 26 is formed together with 0L and 20R.

The left and right spaces 26 are on the front side and cover 28
And a step surface 29 formed on the upper surface of the swivel base 1 in front of the cockpit 2. Due to the existence of the left and right spaces 26, for example, when an operator walks between the crawler traveling device 5 and a structure or the like with the swivel base 1 in a forward posture,
The upper body of the operator corresponds to the height of the side edges 20L, 20R and the side surface of the cover 28, and the wide space facilitates walking, and the operator descends from the step surface 29 to rotate the platform 1.
It is possible to pass through the outer side of the car and reach the back of the backhoe, improving workability in narrow spaces.

Further, since the side surface of the cover 28 is flush with the side edge portion 20 of the swivel base 1 and located right next to the cockpit 2, when the swivel base 1 is in the forward posture, the cover 28 is in the front-back direction. By being positioned higher than the side edge portion 20 and positioned right beside the operator, the turning posture visual recognition function of the swivel base 1 can be exerted more than the side edge portion 20. In the excavating work device A, the base of the boom 6 is swingably provided in the left-right intermediate portion of the front part of the swivel base 1 via the pivot 25, but the boom 6 is located at the center of the swivel base 1 in the left-right direction. However, the center of the cockpit 2 and the control lever group 31 in the left-right direction is displaced to the left of the center of the swivel base 1 in the left-right direction. 2 and the right side portion of the control lever group 31 are arranged close to each other in the left-right direction.

When the boom 6 is lifted from the state indicated by the chain double-dashed line in FIG. 2, the boom 6 moves to the upper side of the swivel base 1 and is in a rearwardly inclined state (solid line state in FIG. 2). It does not interfere with the group 31 and does not cause any problem for the side operation of the operator. On the contrary, this makes it possible to arrange the control lever group 31 as close to the front part of the swivel base 1 as possible. As a result, the cockpit 2 can be arranged at the front position as compared with the prior art, and the front-rear length of the swivel base 1 can be shortened as much as possible.

[0024]

According to the present invention described in detail above, the swivel base 1
Is a cover 28 located on the side of the cockpit 2 while maintaining the turning posture visibility by the left and right parallel side edges 20L and 20R.
The turning posture can be visually recognized on the side of the
The rear edge portion 22 does not project from the outer end 21 of the left and right crawler traveling device 5 in the lateral posture in which the crawler traveling device 5 is closer to a structure or the like, and the workability in a narrow space can be improved. Even when the crawler traveling device 5 is closer to a structure or the like, when the swivel base 1 is in the forward posture, a person can easily use the space 26 on the outer side of the swivel base 1 and the cover 28 in the front-back direction. It is possible to move to the rear of the swivel base 1 from the step surface 29 through the space 26.

[Brief description of the drawings]

FIG. 1 is a partially cutaway plan view showing an embodiment of the present invention in a forward facing posture.

FIG. 2 is a cutaway side view of the same portion.

FIG. 3 is a front view in a sideways posture.

FIG. 4 is a sectional view of an arm.

FIG. 5 is a cross-sectional view showing another embodiment of the arm.

FIG. 6 is a plan view showing a conventional technique.

[Explanation of symbols]

 1 swivel 2 pilot seat 3 engine 4 traveling platform 5 crawler traveling device 6 boom 9 radiator 12 fuel tank 13 hydraulic oil tank 20 side edge 21 outer edge 22 rear edge 23 front edge 25 pivot section 26 space 27 width 28 Cover 29 Step surface 31 Control lever group

Claims (3)

[Claims] 1. A swivel base (1) is rotatably mounted on a traveling machine base (4) having left and right crawler traveling devices (5), and an engine (3) and a tank are mounted on the swivel base (1). The excavation work device (A) is provided in front of the swivel base (1) by being surrounded by a cover (28), and the swivel base (1) is provided with left and right side edges (20L, 20R) along the front-rear direction when facing forward. The side edges (20L, 20R) of the swivel base (1) are formed into an arc without forming the side edges (20L, 20R) from the outer ends (21) of the left and right crawler traveling devices (5) to the outside in the left and right directions. When the swivel base (1) is formed into a shape and is in a lateral posture in which the swivel base (1) is swung by 90 degrees, the rear edge portion (22) is set in a non-projecting state from the outer end (21) of the left and right crawler traveling devices (5), and the cover (28 ) Place the cockpit (2) on the top of the swivel base (1) with the side and rear faces of the cover (28). Side edge (20) and trailing edge (22)
Between the left and right side edges (20L, 20R) of the swivel base (1) and the side surfaces of the cover (28) and the outer ends (21) of the left and right crawler traveling devices (5) in a substantially forward direction. A backhoe having a space (26) opened in the front-rear direction and in the upward direction on the left and right crawler traveling devices (5). 2. A step surface (29) communicating with both left and right spaces (26) is formed on the upper surface of the swivel base (1) in front of the cover (28) and the cockpit (2). The backhoe according to Item 1. 3. The cover (28) according to claim 1, wherein the cover (28) has left and right side surfaces that are substantially flush with the left and right side edge portions (20L, 20R) of the swivel base (1). Backhoe.