JP4425061B2 - Dozer equipment - Google Patents

Description

  The present invention relates to a dozer device.

As a conventional dozer device, there is one shown in Patent Document 1. This dozer device is provided in a turning work machine such as a backhoe, and is provided on the front side of the traveling device of the turning work machine.
This dozer device is mainly composed of a pair of left and right support arms provided in the traveling device, and a blade attached to the tip of the left and right support arms.
This blade is formed by fixing a plate-like rear blade to the back surface of a curved plate-like front blade.
That is, the blade is formed by adhering a plate-like front blade and a rear blade having substantially the same length to the front blade to the front and rear in a bonded form.
JP 2001-260939 A

In the conventional dozer apparatus, the front blade and the rear blade are bonded to each other in the front and back to form a blade, so that it becomes a single plate-like member that is substantially long from side to side.
Here, during the operation of the dozer device, since a large stress acts on the entire blade, in order to maintain the strength of the blade, there is a problem that a plurality of reinforcing members must be provided on the back surface of the blade, which increases the manufacturing cost. .
SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a dozer device that has a strong blade, a small number of reinforcing members, and a low cost.

In order to achieve the above object, the present invention takes the following technical means. That is , the central rear blade is formed by welding the back of the front blade to the tip of the pair of left and right support arms , and forming a box-shaped portion closed on both the left and right sides by the left and right support arms on the back of the front blade between the left and right support arms . the welded, before the blade back side for forming a box-shaped portion which is closed by side plates provided at the end portions of the left and right direction of the support arm and the front blade between each support arm and the front blade each end The rear rear blade is welded, and the welded portion of the central rear blade with respect to the left and right support arms protrudes to the support arm base end side from the welded portion of the side rear blade with respect to the left and right support arms .
According to this, the left and right support arms are fixed to the front blade, and the central rear blade is provided on the back of the front blade between the left and right support arms, so that the left and right central portions of the blade are formed in a box shape. The section modulus of the central portion increases as compared with the conventional one, and the strength of the left and right central portions of the blade is improved.

Therefore, it is not necessary to provide a reinforcing member on the back side of the left and right central portion of the blade, a strong blade can be configured, and the manufacturing cost is low.
Further, since the left and right side portions of the blade are also formed in a box shape, the left and right side portions of the blade are strengthened similarly to the left and right central portions of the blade.
Another technical means for solving the problems in the present invention, the left and right have been welded to the reinforcing member between each side after the blade left and right side surfaces of the support arms, the welded portion of the reinforcing member for the right and left support arms The support arm base end side is shifted to the support arm base end side from the welded portion of the center rear blade with respect to the left and right support arms.

According to this, the left and right central part of the blade can be strengthened, and the left and right side parts of the blade can be strengthened by the reinforcing member.
Another technical means for solving the problem in the present invention is that the side rear blade has an upper wall welded to the back surface of the front blade, and a lower wall welded to the lower side of the back surface of the front blade, A back wall that welds the upper wall and the lower wall on the rear side, and the central rear blade is welded to the rear surface of the front blade above the upper wall of the side rear blade; A lower wall welded to the lower side of the back of the front blade, and a back wall that welds the upper wall of the central rear blade and the lower wall of the central rear blade behind the back wall of the side rear blade. It is preferable to provide.
The support arm is formed by connecting a pair of vertical plates with a horizontal plate, and the upper edge of the vertical plate is shifted upward as it approaches the front blade, and the tip of the upper edge of the vertical plate is the back of the front blade. It is in the point extended to the upper end part.
According to this, the support arm can be strengthened, and the upper edge of the vertical plate forming the support arm is shifted upward as it approaches the front blade, so that the support arm is applied to the work of the dozer device. Stress can be dispersed.

  The blade can be strengthened, the number of reinforcing members can be reduced, and the cost can be reduced.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 7, 1 is a turning work machine (backhoe) having the dozer device 2 of the present invention, and this turning work machine 1 is mainly composed of a lower traveling device 3 and an upper turning body 4. .
The traveling device 3 includes a pair of left and right traveling bodies 5 each having a rubber cover, and a crawler traveling apparatus is employed in which the traveling bodies 5 are driven by a traveling motor. A dozer device 2 is provided at the front portion of the traveling device 3.
The swivel body 4 includes a swivel base 8 supported on the traveling device 3 via a swivel bearing 7 so as to be capable of swiveling left and right around a swivel axis in the vertical direction, and an excavation device 9 provided at a front portion of the swivel base 8. Have On the swivel base 8, a cabin 10 forming an operator cab is mounted.

The excavator 9 includes a swing bracket 12 supported by a pair of upper and lower support brackets 11 provided at the front portion of the swivel base 8 so as to be swingable left and right around the vertical axis, and a base side of the swing bracket 12 around the horizontal axis. A boom 13 pivotally mounted and supported so as to swing up and down, and an arm 14 pivotally mounted around the horizontal axis on the tip side of the boom 13 and supported so as to swing back and forth. The arm 14 is provided with a bucket 15 provided so as to be able to perform a squeeze / dump operation.
The swing bracket 12 is swung by the expansion and contraction of the swing cylinder provided in the swivel base 8, and the boom 13 is swung by the expansion and contraction of the boom cylinder 16 interposed between the boom 13 and the swing bracket 12. The arm 14 is swung by the expansion and contraction of the arm cylinder 17 interposed between the arm 14 and the boom 13, and the bucket 15 is a bucket cylinder 18 interposed between the bucket 15 and the arm 14. The swing cylinder, the boom cylinder 16, the arm cylinder 17, and the bucket cylinder 18 are constituted by hydraulic cylinders (hydraulic equipment).

The arm 14 is provided with a hydraulic pressure take-out portion (not shown) for operating a hydraulic attachment attached instead of the bucket 15.
The swivel base 8 is attached to a swivel board 19 made of a thick plate supported rotatably around a swivel axis via a swivel bearing 7 provided on the traveling device 3, and a rear part of the swivel board 19. It has a rear cover 20 that constitutes the rear part of the swivel base 8 and has a function of a balance weight for balancing the weight with the excavator 9. The left and right side surfaces and the front surface of the swivel base 8 are covered with left and right covers 21.

The rear upper surface and the right upper surface of the swivel base 8 are open, and these open portions protrude upward from the upper surface of the swivel base 8 and are covered with a rounded bonnet 22. A driver's seat is arranged on the left side of the swivel base 8 in the left-right direction, and this driver's seat is covered with a cabin 10.
On the swivel base 8, an engine, a fuel tank, a hydraulic pump, a hydraulic oil tank, a control valve, a radiator, an oil cooler, a reserve tank, a battery, and the like are arranged.
As shown in FIGS. 1 and 2, the traveling device 3 includes a traveling frame 25, drive wheels 26 disposed at the rear and idlers 27 (idling wheels) disposed at the front on both the left and right sides of the traveling frame 25. A plurality of rollers 28 and a carrier roller 29 disposed between the drive wheels 26 and the idler 27 are rotatably supported, and rubber is attached to the drive wheels 26, the idler 27, the carrier rollers 29, and the rollers 28. A pair of left and right traveling bodies 5 configured to wrap around an endless belt-shaped crawler belt 30 made of steel or iron and drive the driving wheel 26 with a hydraulic motor M or the like to circulate the crawler belt 30 is provided. .

As shown in FIGS. 1, 2, and 6, the traveling frame 25 is roughly configured to include a center frame 31 and side frames 32 disposed on the left and right sides of the center frame 31.
The center frame 31 has an upper plate 33 and a bottom plate 34, and is erected between opposed inner surfaces of the upper plate 33 and the bottom plate 34, and is fixed to the upper plate 33 and the bottom plate 34 at upper and lower end edges thereof. The left and right side vertical walls 35, the rear vertical wall 36, and the front vertical wall 37 are provided. The upper plate 33, the bottom plate 34, and the vertical walls 35, 36, and 37 are formed of an iron plate or a steel plate. That is, the main part of the center frame 3137 constitutes a three-dimensional structure in which the upper plate 33 and the bottom plate 34 are connected by the vertical walls 35, 36, and 37.

The center portion of the center frame 31 is formed in a substantially rectangular shape in plan view. The center frame 31 rotatably supports the revolving body 4 via a bearing 7 on its upper surface, and the dozer device 2 on the front portion thereof. Support.
The left and right side portions of the center frame 31 have left and right leg portions C1 that project outward from the center portion in the left-right direction and are connected to the left and right side frames 32.
The center part of the center frame 31 is arranged at a position higher than the side frame 32, and the leg part C1 (outer part of the center frame 31) is formed in an inclined shape that moves downward as it goes in the left-right direction. ing.

The left and right side frames 32 include a main frame 38 that is disposed on the side of the center frame 31 and is long in the front-rear direction and connected to the leg C1. A motor M protrudes from the rear end side of the main frame 38 via a connecting plate 39, and an idler holding portion 41 protrudes from the front side of the main frame 38 via a connecting plate 40.
The upper surface of the main frame 38 of the side frame 32 is inclined so as to gradually descend outward so as to be continuous with the upper surface of the outer portion (leg portion C1) of the center frame 31.

A plurality of mounting plates 42 are provided in the lower part of the main frame 38 of the side frame 32 at intervals in the front-rear direction, and the rolling wheels 28 are supported on the mounting plates 42 so as to be rotatable around a horizontal axis. ing. The mounting plate 42 is formed in a U-shape in plan view with one opening in the front-rear direction opened.
Support brackets 45 that support the dozer device 2 are provided at the left and right ends of the front side of the center frame 31, and a cylinder support that supports a dozer cylinder 46 that raises and lowers the dozer device 2 at the left and right center portion of the front side of the center frame 31. A bracket 47 is provided.

As shown in FIG. 1, the dozer device 2 has a pair of left and right support arms 48R and 48L, and a blade 49 supported by the support arms 48R and 48L.
The base ends of the left and right support arms 48R and 48L are pivotally supported about a horizontal axis 50 by a support bracket 45 provided on the center frame 31, and are supported so as to swing up and down. Each of the support arms 48R, 48L is formed by connecting a pair of left and right vertical plates 51 with a horizontal plate 52.
The blade 49 is formed by integrating a front blade and a rear blade disposed on the front and rear sides by welding or the like. That is, the blade 49 includes a front blade 54 fixed to the front ends of the pair of left and right support arms 48R and 48L, a central rear blade 55 fixed to the back surface 59 of the front blade 54 between the left and right support arms 48R and 48L, It is mainly composed of side rear blades 56 fixed to the back surface 59 of the front blade 54 between the support arms 48R and 48L and the respective ends of the front blade 54.

As shown in FIGS. 2 and 3, the front blade 54 is formed in a plate shape with an iron plate or a steel plate or the like, and side plates 57 are provided at both left and right end portions thereof. The front blade 54 is formed in a slightly curved shape so that it gradually moves backward as it goes from its lower end to the upper and lower substantially central part, and gradually moves forward as it goes from its upper and lower central part to the upper part. The upper end is bent backward.
The center rear blade 55 forms a box-shaped portion 58 in the left and right center portion of the blade 49 together with the left and right support arms 48R and 48L and the front blade 54. The central rear blade 55 is located at a substantially central portion in the left-right direction of the front blade 54, and is formed in a U-shape in cross-sectional view with an opening on the front side and the left and right sides made of an iron plate or a steel plate.

More specifically, the central rear blade 55 has an upper wall 60 whose upper front end (front opening side) is welded to the upper portion of the rear surface 59 of the front blade 54, and a lower front end that is positioned below the rear surface 59 of the front blade 54. It is configured by connecting the welded lower wall 61 with a back wall 62 on the rear side. The upper wall 60, the lower wall 61, and the back wall 62 are integrally formed.
The left and right edges of the central rear blade 55, that is, the left and right edges of the upper and lower walls 60, 61 and the back wall 62 are welded to the vertical plates 51 inside the left and right support arms 48R, 48L by welding or the like. The left and right central portions of the blade 49 are box-shaped, and the box-shaped portion 58 is formed.

As described above, the front portion of the vertical plate 51 inside the left and right support arms 48R and 48L closes the left and right sides of the central rear blade 49, and is also used to form the blade 49 in a box shape.
A cylinder support bracket 63 for supporting the tip of the dozer cylinder 46 is provided on the back surface of the central rear blade 55, that is, the back wall 62, and the tip of the dozer cylinder 46 is pivoted around the horizontal axis. It is supported.
As shown in FIGS. 3 and 4, the side rear blade 56 forms a box-shaped portion 64 on the left and right side portions of the blade 49 together with the left and right support arms 48 </ b> R and 48 </ b> L and the front blade 54. The side rear blades 56 are located on both sides in the left-right direction of the front blade 54, and are formed in a U-shaped cross-sectional view that is opened on the front side and the left and right sides with an iron plate or a steel plate. The front-rear width of the side rear blade 56 is set smaller than the front-rear width of the center rear blade 55.

The side rear blade 56 has an upper wall 65 whose upper front end (front opening side) is welded to the vertical center of the back surface 59 of the front blade 54, and a lower front end at the lower portion of the back surface 59 of the front blade 54. The welded lower wall 66 is connected to the rear side by a back wall 67, and the upper wall 65, the lower wall 66, and the back wall 67 are integrally formed.
The front and rear widths of the upper wall 65 and the lower wall 66 of the side rear blade 56 are smaller than the upper wall 60 and the lower wall 61 of the central rear blade 55, and the back wall 67 of the side rear blade 56 is the back of the central rear blade 55. It is located in front of the wall 62.

The left and right edges of the side rear blade 56, that is, the left and right edges of the upper and lower walls 65, 66 and the back wall 67 are welded to the vertical plate 51 and the side plate 57 outside the left and right support arms 48R, 48L by welding or the like. Thus, the left and right sides of the blade 49 are box-shaped, and the box-shaped portion 64 is formed.
As described above, the front and side plates 57 of the vertical plate 51 outside the left and right support arms 48R and 48L block the left and right sides of the side rear blade 49, and are also used to form the blade 49 in a box shape. Has been.

Therefore, the back surface (back wall 62) side of the central rear blade 55 protrudes to the base end side of the support arms 48R and 48L from the back surface (back wall 67) side of the side rear blade 56, and the left and right support arms 48R, 48R, The welded portion 70 of the back wall 62 of the central rear blade 55 with respect to 48L is located closer to the base end side of the support arms 48R, 48L than the welded portion 71 of the back wall 67 of the side rear blade 56 with respect to the left and right support arms 48R, 48L. ing.
A reinforcing member 73 is welded between the side rear blade 56 and the left and right support blades 49, that is, on the rear portion of the side rear blade 56. The reinforcing member 73 is formed of an iron plate, a steel plate, or the like, and is configured by connecting a rectangular upper wall 74 and a lower wall 75 with a rectangular back wall 76.

The front edges of the upper wall 74 and the lower wall 75 of the reinforcing member 73 are welded to the back wall 67 of the side rear blade 56 by welding or the like, and the inner edges of the upper wall 74 and the lower wall 75 of the reinforcing member 73 are left and right. It is welded to the vertical plate 51 outside the support arms 48R, 48L by welding or the like.
Further, both left and right end portions of the back wall 76 of the reinforcing member 73 are welded to the vertical plate 51 outside the left and right support arms 48R and 48L by welding or the like, and the back surface (back) of the reinforcing member 73 with respect to the left and right support arms 48R and 48L. The weld portion 77 on the wall 76) side is shifted to the base end side of the support arms 48R and 48L from the weld portion 70 on the back side of the central rear blade 55 with respect to the left and right support arms 48R and 48L.

The reinforcing member 73 has a three-dimensional structure having upper and lower walls 74 and 75 and a back wall 76 and having a cavity, but may be formed from a single plate material.
The vertical width of the vertical plate 51 of the left and right support arms 48R and 48L becomes wider as it approaches the blade 49, and the upper edge 51a of the vertical plate 51 of the vertical plate 51 moves upward as it approaches the front blade 54. To be curved. The upper edge 51 a of the front end of the vertical plate 51 extends to the upper end of the back surface 59 of the front blade 54 and is welded to the upper end of the back surface 59 of the front blade 54.

As shown in FIG. 5, the left and right vertical plates 51 are connected from the front end side to the rear end side by two upper and lower rectangular horizontal plates 52U and 52D.
The upper edge 51a of the vertical plate 51 protrudes upward from the upper horizontal plate 52U, and the lower edge 51b of the vertical plate 51 protrudes downward from the lower horizontal plate 52D. The cross section of 48L has a well shape.
As described above, according to the dozer device 2, the front blade 54 is provided at the tip of the pair of left and right support arms 48R and 48L, and the center rear blade 55 is provided on the back surface 59 of the front blade 54 between the left and right support arms 48R and 48L. The left and right central portions of the blade 49 are formed in a box shape, whereby the sectional modulus of the left and right central portions of the blade 49 is increased as compared with the conventional one, and the strength of the left and right central portions of the blade 49 is improved. The blade 49 can be strengthened.

Therefore, the left and right central portion of the blade 49 can be firmly configured, and it is not necessary to provide a reinforcing member on the back side of the left and right central portion of the blade, and the manufacturing cost can be reduced.
Further, by providing side rear blades 56 on the back surface of the front blade 54 between the left and right support arms 48R, 48L and the respective ends of the front blade 54, the left and right side portions of the blade 49 are formed in a box shape. As a result, the section modulus of the left and right side portions of the blade 49 is increased as compared with the conventional one, and the strength of the left and right side portions of the blade 49 is improved. Accordingly, the left and right side portions of the blade 49 can be strengthened.

Furthermore, since the front ends of the left and right support arms 48R and 48L are fixed to the front blade 54, when the blade 49 in a state substantially horizontal to the ground is lifted upward during work, the vertical vibration of the blade 49 can be reduced. it can. Since the cross sections of the left and right support arms 48R and 48L have a well shape, the strength of the left and right support arms 48R and 48L can be improved.
The present invention is not limited to the above embodiment.
In the above embodiment, the left and right central portions of the blade 49 are formed in a box shape by the side walls of the left and right support arms 48R and 48L, the central rear blade 55, and the front blade 54. Thus, the box-shaped portion 58 may be formed by the central rear blade 55 and the front blade 54.

  Alternatively, left and right side walls may be provided on the side rear blade 56, and the box-shaped portion 58 may be formed on the left and right side portions of the blade 49 by the side rear blade 56 and the front blade 54.

It is the whole plane of the traveling apparatus provided with the dozer device of an embodiment of the invention. It is a center side surface sectional view of a dozer device. It is a schematic perspective view of a dozer device. It is a left-right side surface sectional view of a dozer device. It is sectional drawing of a support arm. It is a front view of a traveling frame. It is a whole side view of the turning work machine provided with the dozer device.

Explanation of symbols

2 Dozer device 48L Support arm 48R Support arm 54 Front blade 55 Central rear blade 56 Side blade 58 Box-shaped portion 59 Front blade back surface 64 Box-shaped portion

Claims (3)

The back of the front blade is welded to the tip of a pair of left and right support arms , and the center rear blade is welded to the back of the front blade between the left and right support arms to form a box-shaped part closed on both the left and right sides by the left and right support arms . The rear side of the front blade between each support arm and each end of the front blade to form a box-shaped portion closed by side plates provided at the left and right ends of the support arm and the front blade. dozer device welded blades, the welded portion of the center post blade against lateral support arm, and wherein the projecting support arm proximal to the welded portion of the sides after the blade relative lateral support arm. The side rear blade includes an upper wall welded to the rear surface of the front blade, a lower wall welded to a lower side of the rear surface of the front blade, and a back surface that welds the upper wall and the lower wall on the rear side. A center rear blade, an upper wall welded to the back surface of the front blade above the upper wall of the side rear blade, and a lower wall welded to the lower side of the back surface of the front blade; 2. The dozer according to claim 1, further comprising a back wall that welds an upper wall of the central rear blade and a lower wall of the central rear blade behind the back wall of the side rear blade. apparatus. A reinforcing member is welded between the left and right side rear blades and the side surfaces of the left and right support arms, and the support arm base end side of the welded portion of the reinforcing member with respect to the left and right support arms is connected to the central rear blade with respect to the left and right support arms. The dozer device according to claim 1 , wherein the dozer device is shifted to the base end side of the support arm with respect to the welding portion.

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