JPH11269924A - Revolving working machine, its revolving base, its frame cover, and manufacture of revolving base - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the coats of materials and fabrication of a revolving base by using the frame covers of revolving frames which are similar in as many aspects as possible for different kinds of revolving working machines which differ in the track of revolution of the revolving base. SOLUTION: A revolving frame is rotatably provided on a travel device 2 about a vertical axis, and a revolving base where a frame cover (14L), 14R having a round part 29 on a part thereof is mounted on the outer peripheral part of the revolving frame is provided. The round part 29 of the frame cover (14L), 14R is formed in the same shape as the round part 29 of another frame cover (14L), 14R used in a different kind of revolving working machine which differs in the track of revolution of the revolving base.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turning machine such as a backhoe, a turning table, a frame cover thereof, and a method of manufacturing the turning table.

[0002]

2. Description of the Related Art In a turning machine of this type, generally, a turning table is provided on a traveling device via a turning bearing so as to be rotatable around a vertical axis. It is equipped with an engine device (including the engine and auxiliary equipment connected thereto), a fuel tank, a battery, a hydraulic oil tank, a swing motor, a hydraulic pump, a control valve, and the like.

On the other hand, in the case of a small-turn turning work machine in which the rear side of the turntable does not protrude from the vehicle width of the traveling device, it is necessary to fit the rear side of the turntable into a circle having a diameter equal to the vehicle width. At the rear, the engine and the radiator and the hydraulic pump to be arranged in series with it are the best. Therefore, conventionally, as a layout of the main components inside the swivel in the so-called small-swing back turning machine, an engine in which a hydraulic pump is connected to the left and a radiator fan is connected to the right is arranged laterally at the rear of the swivel, The hydraulic oil tank and the fuel tank are arranged on the front right side of the swivel, and the control valve is arranged on the front left side of the swivel (see, for example, Japanese Patent Application Laid-Open No. 9-189046).

[0004]

However, in the above-mentioned conventional turning working machine, the outer peripheral shape of the turning frame of the turning table is determined by assuming only a so-called small turning turning turning machine, and almost the same weight class. However, with regard to the different types of turning working machines having different turning trajectories of the turning table, the outer peripheral shapes of the turning frames are all different and are not standardized.

[0005] That is, the following three types (A) to (C) are known as the types of turning of this type of turning machine. Conventionally, even turning machines of substantially the same weight class are used. There is no idea to use a common frame cover for the revolving frame in at least two of these types, and the outer peripheral shape of the revolving frame is individually designed in each type.

(A) Standard type in which the rear side of the turntable protrudes from the vehicle width of the traveling device. (B) Small rearward turn in which the rear surface of the turntable does not protrude from the vehicle width of the travel device. (C) Only the rear surface of the turntable. In addition, the excavator at the time of the highest climb does not protrude from the vehicle width of the traveling device.For this reason, the conventional turning machine is a turning machine with almost the same weight, but it is turned with a separate mold or mold. The frame cover of the frame is manufactured, and in this regard, the material cost and the manufacturing cost are high.

SUMMARY OF THE INVENTION In view of such circumstances, the present invention reduces the material cost and the manufacturing cost of a swivel base by making the frame cover of the swivel frame common between different types of swivel working machines having different swivel trajectories. With the goal.

[0008]

In order to achieve the above object,
The present invention has taken the following technical measures. That is, the present invention adopts a frame cover having the same shape as a frame cover used for different types of turning work machines having different turning trajectories, as a frame cover attached to the outer peripheral portion of the turning frame. The cover is common to that of different types of turning work machines.

Here, there are, for example, the three types (A) to (C) of different types of turning working machines having different turning trajectories of the turning table. However, the present invention is not limited to common use for all three types, but also includes common use for at least two of these types. In order to manufacture a swivel base according to the present invention, a frame cover having a portion having the same shape as a frame cover used for a different type of swivel working machine having different swivel paths of the swivel base is prepared in advance, and the frame cover is provided. The length and / or shape of the free end of the turning frame is adapted to be compatible with the turning frame used for the turning machine with a certain turning trajectory, and then the frame cover is attached to the turning frame. I just need.

[0010] In this case, since different types of turning working machines having different turning trajectories of the turning table use partially the same frame cover, it is possible to configure the frame cover with the same mold or mold. As a result, material costs and manufacturing costs of the swivel table can be reduced as compared with the case where frame covers of completely different shapes are used between different types of swivel working machines.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. The drawings show a backhoe as an example of a turning work machine, and FIGS. 5 to 7 show different types of backhoes 1A to 1C having different turning trajectories of a turning table conforming to the common concept of the present invention. These backhoes 1A to 1C are of the same weight class of 4 to 5 tons.

FIG. 5 shows a standard (hereinafter simply referred to as "standard") backhoe 1A in which the rear surface of the swivel 9 protrudes from the vehicle width of the traveling device 2, and FIG. 9 shows a backhoe 1B that makes a small rearward turn (hereinafter, simply referred to as “small rearward turn”) in which the rear side surface 9 does not protrude from the vehicle width of the traveling device 2. FIG. 7 shows a backhoe 1C of a very small turning (hereinafter, simply referred to as a “very small turning”) in which not only the rear surface of the swivel 9 but also the excavating device 4 at the highest position does not protrude from the vehicle width of the traveling device 2. Is shown.

In FIG. 5 to FIG. 7, hatched portions indicate portions common to the standard type and the backhoe 1A, 1B of small back turning only, and mesh portions are all of the standard type, small back turning and ultra small turning. The portions common to the backhoes 1A to 1C are shown. In the following, the backhoe 1
The traveling direction A to 1C (the left-right direction in FIG. 5A) is referred to as the front-rear direction, and the lateral direction perpendicular to the front-rear direction (FIG. 5A)
Is referred to as the left-right direction.

Referring to FIGS. 5 to 7, various backhoes 1 are shown.
A to 1C mainly include a traveling device 2, a revolving unit 3, and an excavator 4. The traveling device 2 includes a truck frame 5
And a pair of left and right crawler traveling bodies 6 having rubber crawler tracks on both left and right sides of the vehicle. ing. This traveling device 2
Is provided with a dozer 7 at the front.

The revolving unit 3 is supported on a track frame 5 of the traveling device 2 via a revolving bearing 8 so as to be rotatable around a vertical revolving axis, and mounted on the revolving table 9. The vehicle includes a hood 10 that covers various devices and a canopy 12 that covers a seat 11 and the like provided on the hood 10 from above. As shown in FIG.
An outer peripheral portion of the revolving frame 13 formed by combining various frame materials on a base plate is covered with frame covers 14L and 14L.
R is fixed to the rear edge of the turning frame 13 and is
A counterweight 15 is provided to balance the weight with the excavator 4 at the front of the vehicle. FIG. 4 shows the swivel 9 of the backhoe 1B that makes a small backward turn.

The revolving table 9 is rotated about a revolving axis X by a revolving motor (not shown) provided at the center of the revolving frame 13. In the standard type backhoe 1A shown in FIG. 5, the rear surface of the revolving unit 3 is formed in an arc shape, but the turning center X of the revolving table 9 is adjusted so that the rear surface protrudes from the vehicle width of the traveling device 2. Set from the front.

On the other hand, in the backhoe 1B of the small backward turning shown in FIG. 6, the turning center X is set to the turning table 9 so that the arc-shaped rear surface of the turning body 3 does not protrude from the vehicle width of the traveling device 2.
Is set at the center of That is, when the revolving unit 3 turns, the turning locus drawn by the rear surface of the revolving unit 3 falls within the left and right widths of the left and right crawler traveling units 6.

As shown in FIGS. 5 (b) and 6 (b),
In the backhoes 1A and 1B of the standard type and the small back swing, the left and right side surfaces of the revolving unit 3 are formed in a plane along the front-rear direction with the revolving unit 3 facing forward, and the interval between the left and right side surfaces is set. Is formed narrower than the diameter of the turning locus circle drawn by the rear surface of the turning body 3. Further, in the same state, the front surface of the revolving unit 3 is formed in a plane along the left-right direction.

In the backhoes 1A and 1B of the standard type and the small back swing, a pair of upper and lower support brackets 17 for supporting the excavator 4 project from the right side of the front surface of the swivel 9. A swing bracket 18 is pivotally mounted on the support bracket 17 via a support shaft so as to be able to swing left and right around a vertical axis. The swing bracket 18 is swung in the left and right direction by a swing cylinder 19 provided inside the swivel 9. Is done.

The excavator 4 includes a boom 2 whose base is pivotally attached to a swing bracket 18 so as to be swingable about the left and right axes.
0, a vertically movable arm 21 pivotally attached to the distal end side of the boom 20 so as to be vertically swingable, and a bucket 22 attached to the distal end side of the vertically movable arm 21 so as to be free to squeeze and dump. The boom 20 is connected to the swing bracket 18.
Boom cylinder 2 provided between the boom 20 and the middle part of the boom 20
3 and the vertically moving arm 21 is moved by the boom 20.
The bucket 22 is swung by an arm cylinder 24 provided between the middle part of the vertical movement arm and the base of the vertical movement arm 21, and the bucket 22 is provided by a bucket cylinder 25 provided between the base of the vertical movement arm 21 and the mounting link of the bucket 22. Squid dumped.

On the other hand, the backhoe 1 with a very small turning shown in FIG.
In C, the turning center X is set at the center of the swivel base 9 so that the arc-shaped rear side surface of the revolving unit 3 does not protrude from the vehicle width of the traveling device 2, and the excavating device 4 at the highest position also travels. The base end of the excavator 4 is pivotally mounted between a pair of left and right support walls 26 erected in the swivel 9 so as not to protrude from the vehicle width of the device 2.

For this reason, when the revolving unit 3 is revolved, the revolving locus drawn by the rear surface of the revolving unit 3 is represented by a left and right crawler traveling unit 5.
, And the turning locus drawn by the tip of the excavator 4 in the highest position also falls within the left and right widths of the left and right crawler traveling bodies 5. Further, in the case of the backhoe 1C having a very small turning, the boom 20 is pivotally mounted between a pair of left and right support walls 26 so as to be vertically movable.
It cannot swing right and left. Therefore, a parallel link mechanism 27 is provided at the tip of the boom 20 and
The left and right positions of the bucket 22 can be changed by pivoting a vertically movable arm 21 to the upper and lower sides so as to freely swing up and down, and swinging a parallel link mechanism 27 in the left and right directions by an offset cylinder 19A.

Next, the common use of the frame covers 14L and 14R of the revolving frame 13 will be described with reference to FIGS. First, FIGS. 1A to 1C show a planar cross-sectional shape of a right frame cover 14R fixed to a front right side of a revolving frame 13, and FIG. 1A shows a standard type. In the case of the backhoe 1A, FIG.
FIG. 1C shows a case of the backhoe 1B having a small backward turn, and FIG. 1C shows a case of the backhoe 1C having a very small turn. FIG. 1D is a cross-sectional view of the frame cover 14R, and the cross-section is constant over the entire length of the frame cover 14R.

The right frame cover 14R has a first piece 30 having a rounded portion 29 which is curved outwardly.
And a second piece 31 welded to the rear end of the first piece 30. Of these, the first piece 30 is integrally formed of a portion having a relatively large radius of curvature R1, a portion having a relatively small radius of curvature R2, and a horizontal straight portion 32 extending straight from the portion in the left-right direction. I have. The second piece 31 is fixed to the first piece 30 so as to be orthogonal to the horizontal straight portion 32.

In this embodiment, the larger radius of curvature R1 of the radius portion 29 is set to 770 mm, and the smaller radius of curvature R2 of the radius portion 29 is 1
50mm, these dimensions are standard,
It is constant for all cases of small backward turning and very small turning. On the other hand, the length W of the horizontal straight portion 32 of the first piece 30
1 to W3, the length W1 of the straight line portion of the standard type and the length W2 of the straight line portion of the small backward turn are respectively set to 172 mm, and the length W3 of the straight line portion of the ultra-small turn is set to 177 mm.

The second piece 31 used for the standard type and the small backward turning is formed in a straight line extending in the front-rear direction, and the second piece 31 used for the very small turning has the larger radius of curvature. It is formed in a curved shape having the same radius of curvature as R1. The length L1 of the standard second piece 31 is set to 518 mm. In the case of small backward turning, the front and rear length of the turning frame 13 is smaller than in the case of the standard type, and accordingly, the length L2 of the second piece 31 is reduced to 318 mm shorter than the length LI of the standard type. Is set. Further, the length L3 of the second piece 31 of the ultra-small turning is set to 272 mm.

FIGS. 2A to 2C show the revolving frame 13.
2A shows a planar cross-sectional shape of a left frame cover 14L fixed to the front left side of FIG. 2A. FIG. 2A shows a standard backhoe 1A, and FIG. In the case of 1B, FIG. 2C shows the case of a backhoe 1C with a very small turning. FIG. 2D is a cross-sectional view of the frame cover 14L, and the cross-section is constant over the entire length of the frame cover 14L.

The left frame cover 14L has a rounded portion 29 which is convexly curved outward, and a rounded portion 29.
Are formed integrally with a horizontal linear portion 32 extending straight in the left-right direction from the vertical direction, and a vertical linear portion 33 extending straight in the front-rear direction from the round portion 29. The vertical straight portion 33 extends in a direction orthogonal to the horizontal straight portion 32. Further, the radius portion 29 is integrally formed with a portion having a relatively large radius of curvature R1 and a portion having a relatively small radius of curvature R2.

Also in the left frame cover 14L, the larger radius of curvature R1 constituting the radius portion 29 is provided.
Is set to 770 mm, and the smaller radius of curvature R2 constituting the radius portion 29 is set to 150 mm, and these dimensions are constant in all cases of the standard type, the small backward turning and the ultra-small turning. . On the other hand, the length W4 of the horizontal straight portion 32 of the standard type is set to 493 mm, the length W5 of the horizontal straight portion 32 of the small backward turning is set to 566 mm, and the length W6 of the horizontal straight portion 32 of the ultra small turning is 573m
m.

The length L4 of the standard vertical straight portion 33
Is set to 705 mm. In the case of a small rearward turning, the front-rear length of the turning frame 13 is smaller than in the case of the standard type. Is set. Further, for the same reason, the length L6 of the vertical straight line portion 33 of the ultra-small turn is set to 573 mm.

Next, a method of manufacturing the turntable 9 using the frame covers 14L and 14R formed as described above will be described. First, when manufacturing the turntable 9 of the standard type backhoe 1A, the second piece 31 cut to L1 is welded to the first piece 30 cut to W1 in the length of the horizontal linear portion 32. Frame cover 14 for standard type
In addition to manufacturing R, the left side frame cover 14L for the standard type, in which the length of the horizontal straight portion 32 is cut into W4 and the length of the vertical straight portion 33 is cut into L4, is manufactured. What is necessary is just to bolt-connect 14L, 14R to the revolving frame 13 for standard types.

In the case of manufacturing the swivel 9 of the backhoe 1B having a small rearward turning, the length of the horizontal straight portion 32 is W2
The second piece 31 cut to L2 in length is welded to the first piece 30 cut to L2 to produce the right frame cover 14R for small backward turning, and the length of the horizontal straight portion 32 is reduced to W5. It is cut and the length of the vertical straight portion 33 is L5
Frame cover 14 for small back turning
L, and each of these frame covers 14L, 14R
May be bolted to the standard type turning frame 13.

Further, in the case of manufacturing the turntable 9 of the backhoe 1C having an ultra-small turn, the first piece 30 having the length L3 cut into the first piece 30 having the length of the horizontal straight portion 32 cut into W3. The piece 31 is welded to produce the right frame cover 14R for the ultra-small turning, and the ultra-small turning in which the length of the horizontal straight portion 32 is cut to W6 and the length of the vertical straight portion 33 is cut to L6. The left frame cover 14L may be manufactured, and these frame covers 14L and 14R may be bolted to the standard type revolving frame 13.

In this case, each frame cover 14L, 14
Since the shape of the round portion 29 of R is constant, it is possible to manufacture each frame cover for a standard type, a small backward turning or a very small turning by appropriately cutting a member made of the same mold or die. it can. As described above, according to the present embodiment, three types of backhoes 1 having different turning trajectories of the turning table 9 are provided.
Since the rounded portions 29 of the frame covers 14L and 14R are set to the same shape for A to 1C, the frame covers 14L and 14R can be configured with the same mold and mold, and the backhoes 1A to 1C are separately provided. Material costs and manufacturing costs can be reduced as compared with the case where a frame cover having a shape is used.

The present invention is not limited to the above embodiment. For example, as shown in FIG.
The left frame cover 14 </ b> L includes a first piece 35 consisting solely of a round portion 29, a second piece 36 straight in the front-rear direction welded to the rear end of the first piece 35, and a front end of the first piece 35. The third piece 37 that is welded and straight in the left-right direction can be divided into three parts (the same applies to the right frame cover 14R).

As shown in FIG. 3 (b), the left frame cover 14R also includes a first piece 30 integrally having a round portion 29 and a horizontal straight portion 32, and a second piece straight in the front-rear direction. 31 can be divided into two parts. However, the frame covers 14L, 14
When R is divided, a dividing line appears in the middle of R.
It is preferable that the frame covers 14L and 14R be integrally formed as much as possible from the viewpoint of appearance.

The rounded portion 29 of each of the frame covers 14L and 14R does not need to be curved over the entire length thereof, and may have a straight portion that is partially inclined in the front-rear direction and the left-right direction. Is also included. Further, each of the frame covers 14L and 14R can be shared by portions other than the round portion 29. In the above-described embodiment, the frame covers 14L and 14R are shared for all of the standard type, the small rear turning, and the ultra-small turning. However, only the at least two types of the frame covers 14L and 14R are used. You may make it common.

[0038]

As described above, according to the present invention,
Since the frame cover of the revolving frame can be shared between different types of revolving work machines having different revolving trajectories, material costs and manufacturing costs of the revolving base can be reduced.

[Brief description of the drawings]

1 (a) to 1 (c) are plan sectional views of a right frame cover, wherein (a) is for a standard type, (b) is for a small rearward turn, and (c) is for a micro turn. Is shown. (D) is a cross-sectional view of the frame cover.

FIGS. 2A to 2C are plan sectional views of a left frame cover, wherein FIG. 2A is for a standard type, FIG. 2B is for a small rearward turn, and FIG. Is shown. (D) is a cross-sectional view of the frame cover.

FIG. 3 is a plan sectional view showing a modification of the left frame cover.

FIG. 4 is an assembled perspective view of the swivel base.

FIG. 5A is an overall side view of a standard backhoe, and FIG. 5B is a plan view of the same backhoe.

FIG. 6A is an overall side view of a backhoe that makes a small backward turn, and FIG. 6B is a plan view of the backhoe.

FIG. 7A is an overall side view of a very small turning backhoe, and FIG. 7B is a plan view of the backhoe.

[Explanation of symbols]

 Reference Signs List 1A Standard type backhoe 1B Backward small turning backhoe 1C Ultra-small turning backhoe 2 Traveling device 9 Turning table 13 Turning frame 14L Left frame cover 14R Right frame cover 29 Round part (part of same shape)

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kazuomi Sugiyama 64 Ishizukita-cho, Sakai-shi, Osaka Inside Kubota Sakai Works

Claims (4)

[Claims] 1. A revolving frame (1) is mounted on a traveling device (2).
3) is provided so as to be rotatable around a vertical axis, and a frame cover (14) is provided on an outer peripheral portion of the revolving frame (13).
L, 14R), wherein the frame covers (14L, 14R) have the same shape as the frame covers (14L, 14R) used for different types of turning machines having different turning trajectories. 29) A turning work machine comprising: 2. A turning frame (13) provided on a traveling device (2) so as to be rotatable around a vertical axis, and a frame cover (14L) attached to an outer peripheral portion of the turning frame (13). , 14R), the frame cover (14L, 14R) has the same shape as the frame covers (14L, 14R) used for different types of turning machines having different turning trajectories. A turning table of a turning work machine, characterized by comprising a portion (29). 3. A frame cover (14L, 14L) used for different types of turning working machines having different turning trajectories of the turning table (9).
R) The turning cover frame cover of the turning work machine, comprising a portion (29) having the same shape as that of (R). 4. The frame cover (14) according to claim 3,
L, 14R) are prepared in advance, and the length and / or shape of the free ends of the frame covers (14L, 14R) are used for a turning work machine having a specific turning locus (13). And forming the frame cover (14L, 14R) on the revolving frame (13).