JP3459353B2 - Revolving frame of revolving work machine and method of manufacturing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Generally, in a revolving work machine of this type, a revolving frame is provided on a traveling device so as to be rotatable around a vertical axis center through a revolving bearing. , An engine device (including an engine and auxiliary devices connected thereto), a fuel tank, a battery, a hydraulic oil tank, a swing motor, a hydraulic pump, a control valve, and the like. The swivel frame includes a frame substrate rotatably provided on the traveling device, a pair of left and right vertical ribs fixed to the frame substrate and having an inclined portion that inclines outward in the left-right direction toward the rear.
Is provided, and the rigidity of the revolving frame is improved by the pair of vertical ribs (for example, Japanese Unexamined Patent Publication No. H9 (1998) -96952).
(See Japanese Laid-Open Patent Application No. 302719).

[0003]

However, in the conventional swivel work machine described above, the shape of the vertical ribs of the swivel frame is determined on the assumption that only a so-called small rear swivel work machine is used. Even for revolving work machines, different types of revolving work machines having different revolving trajectories of the revolving bases are not unified because the vertical ribs of the revolving frame have different shapes. That is, the following two types (A) and (B) are known as the swivel types of this type of swivel work machine, but conventionally, even in swivel work machines of approximately the same weight class, these types are also known. There is no idea to make the shape of the vertical ribs of the swivel frame common to the two types, and the shape of the vertical ribs is designed individually for each type.

(A) Standard type in which the rear side of the swivel protrudes from the vehicle width of the traveling device. (B) Small rearward swivel in which the rear side of the swivel does not protrude from the vehicle width of the traveling device. The vertical ribs of the swivel frame are manufactured by separate molds or dies, even though the swivel working machines are of almost the same weight class, and in this respect, the material cost and the manufacturing cost are high. In view of such circumstances, an object of the present invention is to reduce the material cost and the manufacturing cost of the revolving frame by making the shape of the vertical ribs of the revolving frame common between different types of revolving work machines having different revolving trajectories. And

[0005]

[Means for Solving the Problems] In order to achieve the above object,
The present invention has taken the following technical means. That is, the present invention adopts, as the vertical ribs fixed to the frame substrate, those having a portion having the same shape as the vertical ribs used in different types of turning work machines having different turning trajectories. The vertical ribs of are common to those of different types of turning work machines. Here, the different types of turning work machines having different turning trajectories include, for example, the above-described two types (A) and (B), but are not limited thereto.

According to the present invention, since the vertical ribs having the same shape as in the case of different kinds of turning working machines having different turning trajectories are used, the same mold or mold as in the case of different kinds of turning working machines is used. The vertical ribs can be formed by a mold, and the material cost and the manufacturing cost of the turning frame can be reduced as compared with the case where the vertical ribs having completely different shapes are used between different types of turning work machines. Further, according to the present invention, when a mounting bracket of a swing cylinder for swinging the excavation device pivotally mounted on the frame substrate is fixed to the vertical rib, the mounting bracket is attached to a pivot point of the excavation device. It is recommended to arrange the relative position so that it is in the same plane position as that of the mounting bracket used for different types of swing work machines with different swing trajectories.

By doing so, the swing cylinders can be shared by the same type of swing working machines having different swing trajectories, so that the material cost and manufacturing cost of the swing frame can be further reduced. Further, a pair of left and right vertical ribs are provided on the frame substrate, and as the pair of left and right vertical ribs, an inclined portion that extends outward in the left and right direction toward the rear and a straight line that extends straight rearward from the rear end of the inclined portion. In the case of adopting the one in which the portion and the portion are integrally formed, it is preferable to form the linear portion so that the distance in the left-right direction is equal to or larger than the diameter of the slewing bearing.

In this case, the rigidity of the revolving frame can be effectively ensured by disposing the vertical ribs so as to straddle the revolving bearing between the straight portions of the pair of left and right vertical ribs. Furthermore, in order to further improve the rigidity of the swivel frame, it is preferable that the rear ends of the pair of left and right vertical ribs are connected to each other by a horizontal rib fixed on the frame substrate and extending in the left-right direction. On the other hand, in order to manufacture a revolving frame according to the present invention, a vertical rib having a portion having the same shape as a vertical rib used for different types of revolving work machines having different revolving trajectories is prepared in advance, and the rear end of this vertical rib is prepared. The vertical ribs may be fixed to the frame substrate after forming the length of the portion so as to match the frame substrate used for the swing working machine having a specific swing trajectory.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. The drawings show backhoes as examples of swivel work machines, and FIGS. 4 and 5 show different types of backhoes 1A and 1B having different swivel trajectories of a swivel base that conform to the common concept of the present invention. These backhoes 1A and 1B are of the 4-5 ton class having almost the same weight class. Of these, FIG. 4 shows a backhoe 1A of a standard type (hereinafter, simply referred to as “standard type”) in which the rear side of the swivel base 9 protrudes from the vehicle width of the traveling device 2, and FIG.
Shows a backhoe 1B of a rear small turn (hereinafter, simply referred to as "rear small turn") in which the rear side of the swivel base 9 does not extend beyond the vehicle width of the traveling device 2.

In FIG. 4 and FIG. 5, the shaded portion shows the portion common to the standard type and the rear small turning backhoes 1A and 1B, and the mesh portion shows the so-called ultra-small turning backhoe (not shown). Shows the parts that can be shared. In the following, the running direction of the backhoes 1A and 1B (the left-right direction in FIG. 4A) is referred to as the front-rear direction, and the lateral direction orthogonal to the front-rear direction (the paper penetration direction in FIG. 4A) is the left-right direction. Say. 4 and 5, various backhoes 1A and 1B are mainly composed of a traveling device 2, a revolving structure 3 and an excavating device 4.

The traveling device 2 is constructed by providing a pair of left and right crawler traveling bodies 6 having rubber crawler tracks on the left and right sides of the track frame 5, respectively.
A crawler type traveling device in which the motor is driven by a traveling motor (not shown) is adopted. A dozer 7 is provided at the front of the traveling device 2. The revolving structure 3 is supported by a track frame 5 of the traveling device 2 via a revolving bearing 8 so as to be revolvable around a revolving shaft center in the vertical direction.
A bonnet 10 that covers various devices mounted on the swivel base 9, and a canopy 12 that covers the seat 11 and the like provided on the bonnet 10 from above.

As shown in FIG. 3, the swivel base 9 is constructed by covering the outer peripheral portion of the swivel frame 13 formed by combining various frame materials on the frame substrate 13A with frame covers 14L and 14R. , At the rear of this swivel base 9,
A counterweight 15 is provided which is fixed to the rear edge of the swivel frame 13 and balances the weight of the excavator 4 and the like in front of the swivel base 9. The swivel frame 13 is
The traveling device 2 is provided with a frame substrate 13A rotatably provided around a vertical axis and a pair of left and right vertical ribs 39, 40 fixed on the frame substrate 13A. Note that FIG. 3 shows the swivel base 9 of the backhoe 1B that makes a small rearward swivel. The swivel base 9 is swiveled around a swivel axis X by a swivel motor 16 (see FIGS. 1 and 2) provided at the center of the swivel frame 13.

In the standard type backhoe 1A shown in FIG. 4, the rear side surface of the revolving structure 3 is formed in an arc shape, and the revolving center X is arranged so that the rear side surface protrudes from the vehicle width of the traveling device 2.
Is set from the front of the swivel base 9 (see FIG. 1).
On the other hand, the backhoe 1B shown in FIG.
The turning center X is set at the center of the turning base 9 so that the arc-shaped rear side surface of the turning body 3 does not protrude from the vehicle width of the traveling device 2. That is, when the revolving unit 3 revolves, the revolving locus drawn by the rear surface of the revolving unit 3 falls within the width of the left and right crawler traveling units 5.

As shown in FIGS. 4 (b) and 5 (b),
In these standard type and rear small turning backhoes 1A and 1B, the left and right side surfaces of the revolving structure 3 are formed in a plane along the front-rear direction with the revolving structure 3 facing forward, and the space between these left and right side surfaces is formed. Is formed to be narrower than the diameter of the circle of the turning trajectory drawn by the rear surface of the turning body 3. Further, in the same state, the front surface of the revolving structure 3 is formed into a flat surface along the left-right direction.
In addition, in the standard type and the rear small turn backhoes 1A and 1B, a pair of upper and lower support brackets 17 that support the excavation device 4 so as to swing left and right are projected from the front right side of the swivel base 9. A swing bracket 18 is pivotally attached to the support bracket 17 via a support shaft so as to be swingable right and left around a vertical axis, and the swing bracket 18 is swingable in the left and right directions by a swing cylinder 19 provided inside the swivel base 9. To be done.

The excavator 4 has a boom 2 whose base is pivotally attached to a swing bracket 18 so as to be swingable about left and right axes.
0, a vertical movement arm 21 pivotally attached to the tip end side of the boom 20 so as to be vertically swingable, and a bucket 22 attached to the tip end side of the vertical movement arm 21 so as to be freely squeezed and dumped. The boom 20 has a swing bracket 18
Cylinder 2 provided between the boom and the middle of the boom 20
3, the up-and-down moving arm 21 is moved by the boom 20.
The bucket 22 is swung by the arm cylinder 24 provided between the middle part of the vertical movement arm 21 and the base of the vertical movement arm 21, and the bucket 22 is moved by the bucket cylinder 25 provided between the base of the vertical movement arm 21 and the attachment link of the bucket 22. Squid dumped.

Next, the common use of the vertical ribs 39, 40 of the revolving frame 13 will be described with reference to FIGS. 1 and 2. First, FIG. 1 shows a planar structure of a revolving frame 13 mounted on a standard backhoe 1A. The rotating frame 13 is provided with the frame <br/> substrate 13A formed in a flat shape, a pair of left and right vertical ribs 39, 40 that are disposed on the frame board 13A, a frame
A pair of upper and lower support brackets 17 are fixed to the front end of the substrate 13A.

Revolving frame 13 (frame substrate 13A)
The swivel bearing 8 is fixed to the front part of the lower surface of the swivel bearing, and a housing hole 38 for a swivel joint is provided in an inner diameter side portion of the swivel bearing 8 in the frame substrate 13A. Further, in the standard type, since the slewing bearing 8 is arranged near the front part of the frame substrate 13A and there is no room in the front space of the slewing frame 13, the slewing motor 16 is arranged behind the housing hole 38. The pair of left and right vertical ribs 39, 40 integrally includes an inclined portion 41 that extends outward in the left-right direction toward the rear and a straight portion 42 that extends straight rearward from the rear end of the inclined portion 41. The front end of the portion 41 is fixed to the upper and lower support brackets 17 while being sandwiched between them. In addition, the linear portions 42 of the pair of left and right vertical ribs 39, 40
Are arranged parallel to each other.

The rear ends of the straight portions 42 of the left and right vertical ribs 39, 40 are connected to each other by a horizontal rib 43 fixed on the frame substrate 13A and extending in the left-right direction. The distance between the straight portions 41 in the left-right direction is set to be equal to or larger than the diameter of the slewing bearing 8. In the present embodiment, each vertical rib 39, 4
The plate material having the same thickness is used for 0 and the horizontal rib 43. Further, a second horizontal rib 44 is fixed to the linear portion 42 of the right vertical rib 40 in a state of protruding to the right, and the excavator 4 is provided at the intersection of the second horizontal rib 44 and the linear portion 42.
A mounting bracket 45 of the swing cylinder 19 for swinging the is fixed.

On the other hand, FIG. 2 shows a backhoe 1 which makes a small rearward turn.
The plane structure of the revolving frame 13 mounted in A is shown. In FIG. 2, members having the same functions as those in FIG. 1 are designated by the same reference numerals. The swivel frame 13 of FIG. 2 used for a small rearward swivel is a frame substrate 1 formed in a flat plate shape whose rear part shape is different from that of the standard type (FIG. 1).
3A is adopted, and the pair of left and right vertical ribs 39, 40 erected on the frame substrate 13A are set to have the same shape as that of the standard type (FIG. 1) of the inclined portion 41. Further, the same member as in the case of the standard type (FIG. 1) is also used for the support bracket 17 fixed to the front end of the frame substrate 13A.

That is, the support bracket 17 and the vertical ribs 39 and 40 used for the standard type (FIG. 1), and the support bracket 17 and the vertical rib 3 used for the small rear swing (FIG. 2).
Comparing 9 and 40, the support bracket 17 uses exactly the same member for both, and
Each vertical rib 3 which is bifurcated from the support bracket 17
9 and 40 are set to have the same shape in the range from the inclined portion 41 to the bent portion to a part of the straight portion 42. In other words , the shape of the support bracket 17 and the left and right vertical ribs 39, 40 fixed to the support bracket 17 from the inclined portion 41 to the straight portion 42 is the standard type (FIG. 1) and the rear small turn (FIG. 2). ) And are set to the same shape, so that both backhoes 1A,
The vertical ribs 39 and 40 having the same shape are also used for 1B.

Revolving frame 13 (frame substrate 13A)
The slewing bearing 8 is fixed to the central part of
An accommodation hole 38 for a swivel joint is provided in a portion of the frame substrate 13A on the inner diameter side of the slewing bearing 8. In the rear small turning, since the turning bearing 8 is arranged in the central portion of the frame substrate 13A and there is no room in the rear space of the turning frame 13, the turning motor 16
Is arranged in front of the storage hole 38. Further, at the intersection of the straight portion 42 of the vertical rib 40 on the right side and the horizontal rib 43,
Swing cylinder 19 for swinging the excavator 4
The mounting bracket 45 of is fixed. The mounting bracket 45 is arranged such that the relative position of the mounting bracket 45 to the pivot point Y of the excavation device 4 is the same plane position as in the case of the standard type (FIG. 1).

In the case of the small rearward turning, the bent portion 39A of the left vertical rib 39 is arranged outside the turning bearing 8, whereby excessive stress concentration is exerted on the bent portion 39A. To prevent it from happening.
Next, a method of manufacturing the revolving frame 13 using the vertical ribs 39 and 40 formed as described above will be described. First, when manufacturing the swivel frame 13 of the standard type backhoe 1A, the vertical ribs 39 and 40 in which the length L1 of the linear portion 42 is set for the standard type are prepared, and the vertical ribs 30 and 40 are prepared.
Is fixed to the frame substrate 13A. In addition, the second horizontal rib 44 is fixed to a portion of the right vertical rib 40 that is ahead of the horizontal rib 43 by the length L3, and the mounting bracket 45 is fixed to the front surface of the horizontal rib 44.

The length L3 in this case is a value obtained by subtracting the length L2 of the straight rearward turning small straight portion 42 described later from the length L1 of the standard straight portion 42. Therefore,
The relative position of the mounting bracket 45 in the case of the standard type with respect to the pivot point Y of the excavator 4 is set to the same position as the same relative position of the mounting bracket 45 in the case of a small rearward turn. On the other hand, when manufacturing the swivel frame 13 of the backhoe 1B that makes a small rearward turn, the vertical ribs 39 and 40 in which the length L2 of the linear portion 42 is set for the small rearward turn are prepared. 40 is fixed to the frame substrate 13A. Further, the mounting bracket 45 is fixed to the front surface of the right end portion of the lateral rib 44.

In this case, since the shapes of the support bracket 17 and the inclined portion 41 of each of the vertical ribs 39 and 40 are constant in both the standard type and the rear small turning type, members made of the same mold or die are appropriately used. By cutting, the standard type or the swing frame 13 for small rearward swing can be manufactured at low cost. As described above, according to the present embodiment, the two types of backhoes 1A and 1B having different turning trajectories of the swivel base 9 are
The support bracket 17 and the inclined portion 4 of each vertical rib 39, 40
Since 1 is set to the same shape, the constituent members of the revolving frame 13 can be manufactured using the same mold and die, and the support brackets 1 having different shapes for the respective backhoes 1A and 1B.
The material cost and the manufacturing cost can be reduced as compared with the case of using 7 or the vertical ribs 39, 40.

Further, according to this embodiment, the mounting brackets 45 for the pivot points Y of the excavator 4 are provided for the two types of backhoes 1A, 1B having different swivel trajectories of the swivel base 9.
Since the relative positions of the swing cylinders 19 are the same, the swing cylinder 19 can be the same and can be shared.
The material cost and manufacturing cost of the swivel frame 13 can be further reduced. The present invention is not limited to the above embodiment. For example, in the above embodiment, both the vertical ribs 39 and 40 are made common, but only one of them may be made common. Further, the vertical ribs 39 and 40 may have the same shape except for the inclined portion 41.

[0026]

As described above, according to the present invention,
Since the shape of the vertical ribs of the turning frame is made common to different types of turning work machines having different turning trajectories, the material cost and the manufacturing cost of the turning frame can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view of a swivel frame of a standard backhoe.

FIG. 2 is a plan view of a swing frame of a backhoe that makes a small backward swing.

FIG. 3 is an assembled perspective view of a swivel base.

FIG. 4A is an overall side view of a standard backhoe, and FIG. 4B is a plan view of the backhoe.

FIG. 5A is an overall side view of a backhoe that makes a small rearward turn, and FIG. 5B is a plan view of the backhoe.

[Explanation of symbols]

1A standard backhoe 1B Backhoe with small rear turn 2 traveling devices 4 excavation equipment 8 Slewing bearing 13A frame substrate 19 swing cylinder 39 vertical ribs 40 vertical ribs 41 inclined part 42 Straight part 43 horizontal ribs 45 mounting bracket Y pivot point

Claims (5)

(57) [Claims] 1. A frame substrate (13A) provided on a traveling device (2) so as to be rotatable about a vertical axis, and a vertical rib (3) fixed on the frame substrate (13A).
9, 40), and the vertical ribs (39, 40) are connected to the frame substrate (13).
A) a pair of left and right is provided on the upper side, and an inclined portion (41) extending outward in the left and right direction toward the rear,
A straight line portion (42) extending straight rearward from the rear end of the inclined portion (41) is integrally provided, and the front end of the frame substrate (13A) is provided at the front end of the inclined portion (41).
Fixed to the section to support the excavator (4) so that it can swing left and right.
A support bracket (17) is fixed, and the vertical ribs (39, 40) have a portion (41) having the same shape as the vertical ribs (39, 40) used for different types of turning work machines having different turning trajectories. A swivel frame of a swivel work machine characterized by being provided. 2. The frame base is attached to the vertical ribs (40).
Swing the excavator (4) pivotally attached to the plate (13A).
Swing cylinder (19) mounting bracket (4
5) is fixed, and this mounting bracket (45) has a relative position with respect to the pivot point (Y) of the excavation device (4) of a mounting bracket (45) used for different types of turning working machines having different turning trajectories. The swivel frame for a swivel work machine according to claim 1, wherein the swivel frame is arranged so as to be in the same plane position as that of the case. 3. The horizontal distance between the straight line portions (42) of the vertical ribs (39, 40) is set to the frame substrate (13).
The swivel frame for a swivel work machine according to claim 1 or 2, wherein the swivel frame is formed to have a diameter not less than that of a swivel bearing (8) for rotatably supporting (A). 4. The pair of left and right vertical ribs (39, 40) are connected at their rear ends to each other by lateral ribs (43) fixed on the frame substrate (13A) and extending in the left-right direction. A swivel frame for a swivel work machine according to any one of 1 to 3. 5. A vertical rib (39, 40) having a portion having the same shape as that of a vertical rib (39, 40) used for different types of turning work machines having different turning loci is prepared in advance, and the vertical rib (39, 40) is prepared. (39, 40) is formed so that the length of the rear end of the frame fits to a frame substrate (13A) used for a swing working machine having a specific swing trajectory, and then the vertical ribs (39, 40) are formed on the frame. A method for manufacturing a revolving frame of a revolving work machine, which comprises fixing to a substrate (13A).