JP3378479B2 - Swivel truck frame - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a truck frame used for a turning work machine such as a backhoe.

[0002]

2. Description of the Related Art For example, a turning work machine such as a backhoe employs a crawler traveling device having a crawler which is an endless track zone so as to be rotatable left and right, and the crawler traveling device includes a track frame as a device body. ing. The track frame of such a swing working machine is generally
A center frame having a slewing bearing rotatably supporting a slewing frame on which an engine, a hood, etc. are mounted, and a pair of left and right side frames connected to the left and right ends of the center frame and extending in the front-rear direction are provided. This side frame has an idler around which crawlers are wound and a drive wheel at its front and rear ends.

Conventionally, in order to sufficiently support the load of the revolving structure, as the center frame of the track frame, a pair of front and rear connecting legs for the side frames are provided at both left and right ends (four in total), and a flat surface is provided. A frame that is substantially H-shaped as a whole is used (see, for example, JP-A-8-72615).

[0004]

However, like the conventional track frame described above, when a center frame having a total of four connecting legs on the front, rear, left and right is used, the center frame being substantially H-shaped in plan view is adopted. However, since the shape is complicated, the manufacturing work such as welding and painting is troublesome. Further, in the center frame having an almost H shape in a plan view, a large open hole is formed between the front and rear connecting legs, so that the mud floated up by the crawlers on both the left and right sides of the center frame is the hole. There is a case in which the dirt is scattered to the upper surface side of the center frame, and the mud adheres to the slewing bearing attached to the center frame, which may damage the bearing.

In view of the above situation, the present invention makes the right and left sides of the center frame simple and prevents the muddy soil from being rolled up, thereby facilitating the manufacturing work such as welding and painting, and the swing bearing. Intended to prevent damage.

[0006]

[Means for Solving the Problems] In order to achieve the above object,
The present invention has taken the following technical means. That is, according to the present invention, a center frame (8) having a slewing bearing (14) for rotatably supporting a slewing frame (15) in a central portion, and a front and rear direction connected to both left and right ends of the center frame (8). e Bei pair of right and left side frames (7) extending, before Symbol center frame (8) passes through the front and rear of the pivot bearing (14) in the lateral direction so as prevailing between the side frames (7) A pair of front and rear vertical walls (33) (34) installed and the vertical walls (33)
(34) A pair of left and right connections erected to extend between
A wall (39) and the pair of front and rear vertical walls (33) (34) and
And a pair of left and right connecting walls (39) so as to cover it from above.
Fixed to the upper edge of the
A central plate portion (45) fixed to the center and the central plate portion
(45) is integrally provided on both left and right sides, and has a central plate portion.
Moves downward from (45) toward the left and right
It becomes an inclined shape and it goes forward as it goes outward in the left-right direction.
A side plate portion (46) formed in a trapezoidal shape that widens later
Upper connecting plate (35) having a pair of front and rear vertical walls
(33) (34) and a pair of left and right connecting walls (39)
Fixed to each of their lower edges to cover from and left
Lower part with both right ends fixed to each side frame (7)
A side plate (7) having a connecting plate (36)
Is as the top surface goes from the center in the left-right direction to both sides
It is bent into a sloped mountain shape that moves downward and
Widened before and after the side plate (46) on the top of the mountain
It is characterized in that the left and right outer ends are fixed .

According to the present invention described above, since the upper connecting plate and the lower connecting plate are fixed so as to cover a pair of front and rear vertical walls from above and below, a hole is formed between the front and rear vertical walls. It has a simple shape that is not used. For this reason,
There is no need to perform welding or painting work in a narrow space inside the hole, which simplifies the manufacturing work, and the left and right sides of the center frame are all covered with the upper connecting plate and the lower connecting plate. And a side plate part which is inclined so as to move downward as it goes in the left-right direction and whose outer end is fixed to the top part of the upper surface of the side frame formed in a mountain shape. the left and right sides were to rise up by the crawler in mud is prevented from resulting in the upper surface side of the center frame, further mud is not goodness Hijoni dumping resistance even when having reached the upper surface of the side frame.

[0008] Also, in the present invention, is formed inclined so as left and right ends of the front and rear vertical wall moves back and forth, respectively toward the respective side frame, left and right end portions the longitudinal vertical wall of the upper and lower connecting plates It is preferable to be formed so as to become wider in the front and rear direction toward each side frame corresponding to the inclination. In this case, since the left and right sides of the center frame widen in the front and rear direction as they go outward in the left and right direction, the torsional strength on the left and right sides of the center frame is improved, and the mounting position of the center frame to each side frame is also changed to the front and rear. It becomes wider and the rigidity of each side frame can be improved.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 5 shows a small turning backhoe 1 as an example of a turning work machine adopting the present invention. The backhoe 1 is mainly composed of a traveling device 2, a turning body 3 and an excavating device 4. Note that, hereinafter, the traveling direction of the backhoe 1 (the left-right direction in FIG. 5) is referred to as the front-rear direction, and the lateral direction orthogonal to the front-rear direction (the paper penetration direction in FIG. 5) is referred to as the left-right direction.

As shown in FIG. 5, the traveling device 2 has a pair of left and right crawler traveling bodies 6 around which a rubber or iron crawler 5 is wound, and these traveling bodies 6 are driven by a traveling motor M. A crawler type traveling device is adopted. That is, the traveling device 2 includes a track frame 9 in which a pair of left and right side frames 7 are connected to each other by a central center frame 8, drive wheels 10 provided at rear end portions of the side frames 7, and side frames 7. An idler (idle wheel) 11 provided at the front end of each of the side frames 7, a small wheel 12 provided at the bottom of each side frame 7, and the crawler 5 wound in a range from the drive wheel 10 to the idler 11.
And are equipped with.

A dozer 1 is provided at the front of the traveling device 2.
3 is provided, and inside each side frame 7 of the traveling device 2, a tension adjusting device (not shown) for the crawler 5 is provided. The revolving structure 3 includes a revolving frame 15 rotatably supported by a revolving bearing 14 provided on an upper portion of a center frame 8 of the traveling device 2 about a revolving axis in the vertical direction, and various types mounted on the revolving frame 15. A bonnet 16 for covering the equipment and a cabin 19 for covering the seat 17 provided on the bonnet 16 and the control section 18 in front of the seat 17 are provided.

The revolving frame 15 is constructed by covering the outer periphery of a base plate having mounting brackets for various devices on the upper surface with a cover member made of FRP, and the rear portion of the revolving frame 15 is fixed to the base plate and is also the revolving frame. The counter weight 20 is configured to balance the weight of the excavator 4 and the like at the front of the fifteen. The revolving frame 15 is revolved around a revolving axis X by a revolving motor (not shown) fixed to the base plate. The backhoe 1 shown in FIG. 5 is of a so-called small rear swing type, and the rear side surface of the swing body 3 is formed in an arc shape so as not to protrude from the vehicle width of the traveling device 2. That is, when the revolving unit 3 revolves, the revolving trajectory drawn by the rear surface of the revolving unit 3 is the left and right crawler traveling units 6.
It fits within the left and right width of.

A pair of upper and lower support members 21 for supporting the excavator 4 are projected from the front end of the revolving frame 15. A swing bracket 22 is pivotally attached to the support member 21 via a support shaft so as to be swingable right and left around a vertical axis, and the swing bracket 22 is swung by a swing cylinder (not shown) provided inside the swing frame 15. It Excavator 4
Is a boom 23 whose base is pivotally attached to the swing bracket 22 so as to be swingable about the left-right axis, and an arm 24 pivotally attached to the tip end side of the boom 23 so as to be swingable about the left-right axis,
The arm 25 is provided with a bucket 25 attached to the tip end side so as to be freely squeezed and dumped.

The boom 23 includes a boom cylinder 26 provided between the swing bracket 22 and a midway portion of the boom 23.
The arm 24 is swung by the arm cylinder 27 provided between the middle of the boom 23 and the base of the arm 24.
The bucket 25 is swung and dumped by the bucket cylinder 28 provided between the base of the arm 24 and the attachment link of the bucket 25. 1 to 4
As shown in FIG. 3, the track frame 9 includes a center frame 8 having a swing bearing 14 that rotatably supports a swing frame 15 in a central portion, and the center frame 8
And a pair of left and right side frames 7 connected to both left and right ends and extending in the front-rear direction.

Of these, the side frame 7 is formed of a hollow cylindrical body having a substantially pentagonal cross section whose upper surface is bent into a mountain shape so that mud does not accumulate. A front end groove 30 formed at the front end portion of the side frame 7 accommodates a yoke 31 that supports the idler 11 in a freely rotatable manner, and a motor case 32 protruding from the rear end portion of the side frame 7 has a yoke 31. , The traveling motor M directly connected to the drive wheels 10 made of sprockets
Is stored. Further, on the lower edge of the side frame 7, small roller wheels 12 are provided so as to be freely rotatable at regular intervals.

On the other hand, the center frame 8 is provided with a pair of front and rear vertical walls 33, 34 which are installed so as to pass through the front and rear of the slewing bearing 14 in the left-right direction and extend between both side frames.
And an upper connecting plate 35 fixed to the upper edge of each vertical wall 33, 34 so as to cover the space between the pair of front and rear vertical walls 33, 34 from above, and between the pair of front and rear vertical walls 33, 34 downward. And a lower connecting plate 36 fixed to the lower edges of the vertical walls 33 and 34 so as to cover the above. 1 and 2
As shown in FIG. 5, the front and rear vertical walls 33, 34 are made of long steel plates in the left-right direction which are arranged such that the width direction thereof is the vertical direction and the longitudinal direction thereof is the left-right direction. It is welded to the upper surface and the inner side surface of the side frame 7. In addition, the front and rear vertical walls 33, 34 include a central wall portion 37 that is parallel to the left-right direction, and both side wall portions 38 that are formed to be inclined from both the left and right sides of the central wall portion 37.

Of these, both side wall portions 38 of the front vertical wall 33 are inclined forward, and both side wall portions 38 of the rear vertical wall 34 are inclined rearward, on the contrary. The left and right ends of the front and rear vertical walls 33, 34 are formed so as to be inclined forward and backward as they move toward the side frames 7. In addition, both side wall portions 38 of the front and rear vertical walls 33, 34
Has an upper and lower edge cut obliquely so as to be inclined downward as it goes to the outside in the left-right direction (each side frame 7 side). As shown in FIGS. 2 and 3,
Among the respective central wall portions 37 of the front and rear vertical walls 33, 34, the central wall portion 37 of the front vertical wall 33 is arranged so as to pass immediately below the front edge portion of the slewing bearing 14, and the central wall portion of the rear vertical wall 34. Part 3
7 is arranged so as to pass immediately below the rear edge of the slewing bearing 14.

On the other hand, each central wall portion 3 of the front and rear vertical walls 33, 34
The seven are connected to each other by a pair of left and right connecting wall portions 39 that extend straight in the front-rear direction and are arranged vertically. As shown in FIGS. 2 and 4, the pair of left and right connecting wall portions 39 are also arranged so as to pass immediately below the left and right edge portions of the slewing bearing 14. The front end of the connecting wall portion 39 is welded to the inner surface of the central wall portion 37 of the front vertical wall 33, and the rear end thereof is welded to the inner surface of the central wall portion 37 of the rear vertical wall 34. Therefore, in the present embodiment, the slewing bearing 14 is
The front and rear vertical walls 33, 34 are arranged so as to be inscribed in a frame structure formed of the central wall portions 37 and the pair of left and right connecting wall portions 39 and having a substantially square shape in a plan view. The load of the revolving structure 3 is directly carried by the front and rear vertical walls 33, 34 and the connecting wall portion 39, and the strength of the central portion of the center frame 8 is improved.

As shown in FIGS. 2 and 3, dozer brackets 40 for pivotally mounting the dozer 13 are projectingly provided on both front end portions of the central wall portion 37 of the front vertical wall 33.
A cylinder bracket 42 for pivotally mounting a hydraulic cylinder 41 that drives the dozer 13 is provided at the center of the front surface of the vehicle 7. Further, as shown in FIG. 4, the rear vertical wall 34
At the central wall portion 37 of the hydraulic pipe 4 for the traveling motor M.
3 insertion holes 44 are formed. The upper connecting plate 35 is
An upper surface of the central plate portion 45 is provided with a central plate portion 45 formed in a substantially square shape in a plan view, and both side plate portions 46 that are integrally provided on the left and right sides of the central plate portion 45 and are substantially trapezoidal in a plan view. The swivel bearing 14 is bolted to the side.

Both side plate portions 46 of the upper connecting plate 35 are bent and formed so as to incline downward with respect to the central plate portion 45, corresponding to the inclined shapes of the both side wall portions 38 of the front and rear vertical walls 33, 34. And the outside in the left-right direction (each side frame 7
It is formed in a trapezoidal shape in which the front and rear edges widen in the front and rear direction toward the side). The lower surface side of the central plate portion 45 of the upper connecting plate 35 is welded to the upper edges of the central wall portions 37 of the front and rear vertical walls 33 and 34, and the lower surface side of the side plate portions 46 thereof is attached to the front and rear vertical walls 33 and 34. Is welded to the upper edges of both side wall portions 38 of
By welding the left and right edges of the side plate portions 46 to the tops of the side frames 7, the front and rear vertical walls 33, 34 are covered from above so that the vertical walls 33, 34 and each side frame 7 are covered.
It is fixed to.

On the other hand, the lower connecting plate 36 also has a central plate portion 47 formed in a substantially square shape in a plan view and both side plate portions 48 integrally formed on the left and right sides of the central plate portion 47 and having a substantially trapezoidal shape in a plan view. And are equipped with. An inspection hole 49 is formed in the central plate portion 47, and the inspection hole 49 is closed by a bottom lid 50 from below. Further, as shown in FIG. 4, a channel member 51 is provided in the central plate portion 47 of the lower connecting plate 36.
A swivel joint 52 is fixed via. Both side plate portions 48 of the lower connecting plate 36 also have front and rear vertical walls 33, 3
4 corresponding to the inclined shape of both side wall portions 38 of the central plate portion 47.
It is bent so as to incline downward, and is formed in a trapezoidal shape in which the front and rear edge portions thereof widen in the front and rear direction toward the outer side in the left-right direction (each side frame 7 side).

The lower connecting plate 36 has a central plate portion 4
The upper surface side of 7 is welded to the lower edge of the central wall portion 37 of the front and rear vertical walls 33, 34, and the upper surface side of both side plate portions 48 thereof is attached to the front and rear vertical walls 33, 34.
Welded to the lower edges of both side wall portions 38 of 34 and both side plate portions 4
The left and right edges of 8 are welded to the lower portions of the inner side surfaces of the side frames 7 so that the front and rear vertical walls 33, 34 are fixed to the vertical walls 33, 34 and the side frames 7 so as to cover the spaces from below. . According to the track frame 9 having the above-described structure, the upper connecting plate 35 and the lower connecting plate 36, in particular, both side plate portions 46 and 48 cover the space between the front and rear vertical walls 33 and 34 from above and below, respectively. Slewing bearing 1 such as is formed in the case of an H-shaped center frame
Since large holes are not formed on the left and right sides of the center frame 8 between the front and rear vertical walls 33, 34, the mud that has been lifted up by the crawlers 5 on the left and right sides of the center frame 8 is on the upper surface side of the center frame 8. It is prevented that the soil is caught in the slewing bearing 14 as much as possible.

Further, in the case of the track frame 9, when the upper connecting plate 35 and the lower connecting plate 36 are welded to the front and rear vertical walls 33, 34, welding is performed within the hole portion as in the case of the H-shaped center frame in plan view. Since welding is not required, welding work is facilitated, and since the upper connecting plate 35 and the lower connecting plate 36 have a simple shape with no holes, their coating work can be performed easily. Further, in the case of the track frame 9, since the left and right sides of the center frame 8 are spread forward and backward toward the outer side in the left and right direction, the torsional strength on the left and right sides of the center frame 8 is improved, and moreover, the center frame 8 is improved. There is an advantage that the mounting position of the frame 8 with respect to each side frame 7 is widened in the front-rear direction and the rigidity of each side frame 7 can be improved.

In the present embodiment, the case where the present invention is applied to the backhoe 1 which makes a small turn to the rear has been illustrated, but the present invention shows that the standard backhoe having a larger size and the excavator 4 are used.
The device 4 can also be used as a backhoe for an ultra-small turn where the device 4 does not protrude from the turning trajectory of the turning body 3 at the maximum rise.

[0025]

As described above, according to the present invention,
The left and right sides of the center frame are all covered with an upper connecting plate and a lower connecting plate to form a simple shape that can prevent muddy soil from rolling up, which facilitates manufacturing work such as welding and painting of the center frame, as well as turning. It is possible to prevent the bearing from being damaged.

[Brief description of drawings]

FIG. 1 is an assembled perspective view of a track frame of a swing work machine.

FIG. 2 is a plan view of the same track frame.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a sectional view taken along line BB in FIG.

FIG. 5 is a left side view showing the overall structure of a small turning backhoe.

[Explanation of symbols]

1 Small turning backhoe (turning work machine) 2 traveling devices 3 revolving structure 7 side frame 8 center frame 9 truck frames 14 Slewing bearing 15 swivel frame 33 Vertical wall on the front side 34 Rear vertical wall 35 Upper connecting plate 36 Lower connecting plate

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) E02F 9/02

Claims (2)

(57) [Claims] 1. A center frame (8) having a slewing bearing (14) in a central portion for rotatably supporting a slewing frame (15), and extending in the front-rear direction connected to both left and right ends of the center frame (8). e Bei pair of right and left side frames (7), before Symbol center frame (8), said swing bearing (1
Back and forth erection said to spread between side frames (7) passes through the left-right direction has been a pair of front and rear vertical walls of 4) (33) (34) and the row between the vertical wall (33) (34)
A pair of left and right connecting walls (39) erected so as to span, a pair of front and rear vertical walls (33, 34) and a pair of left and right connecting walls.
Fastened to the upper edge of the wall (39) to cover it from above
And the slewing bearing (14) is fixed in the center
Center plate part (45) and both left and right sides of this center plate part (45)
It is integrally provided on the side, and is left and right from the central plate part (45).
It is inclined so that it moves downward as it goes outward.
And a trapezoid that widens in the front and back as it goes outward in the left-right direction
Connection having a side plate portion (46) formed in a shape of
The plate (35), the pair of front and rear vertical walls (33) (34), and the pair of left and right connecting walls.
Put it on their lower edges so as to cover the wall (39) from below
Each side frame is fixed at the left and right ends.
A lower connecting plate (36) fixed to (7), and the upper surface of the side frame (7) is from the center in the left-right direction.
It has an inclined shape that moves downward as it goes to the left and right sides.
Is bent into a mountain shape, and the side plate portion is provided on the top of the mountain shape.
A track frame for a swing working machine, in which the left and right outer ends that are widened before and after (46) are fixed . 2. The front and rear vertical walls (33) (34) are formed so that the left and right ends thereof are inclined so as to move forward and backward as they go toward each side frame (7), and upper and lower connecting plates (35) (36). ) Left and right ends are the front and rear vertical walls (33)
The track frame for a swivel work machine according to claim 1, wherein the track frame is formed so as to be wider in the front-rear direction toward each side frame (7) corresponding to the inclination of (34).