JP4236609B2 - Mounting structure of rotary joint on turning work machine - Google Patents

Description

  The present invention relates to a rotary joint mounting structure in a turning work machine such as a backhoe.

A swivel working machine such as a backhoe is provided with a swivel body equipped with an excavator so as to be rotatable about a swivel axis in the vertical direction on the travel device, and on a swivel axis of a travel frame of the travel device, a rotary joint The rotary joint mounting structure of this type of conventional swivel work machine has a rotary joint mounted directly on the bottom plate of the traveling frame of the traveling device or via a mounting bracket. The bottom surface of the joint is fixed to the bottom plate of the traveling frame or a fixing tool such as a bolt via a mounting bracket (for example, Patent Document 1 and Patent Document 2).
JP 2001-271380 A JP-A-11-93209

Therefore, in the conventional case, when a rotational torque is applied to the rotary joint, the rotary joint acts so as to largely swing around the bottom surface side. Therefore, the rotary joint mounting portion on the bottom plate of the traveling frame, the mounting bracket, etc. It was necessary to have strength.
In addition, when a fixing tool such as a bolt is loosened, there is a high possibility that the rotary joint swings with the bottom surface side as a fulcrum and the hydraulic hose connected to the rotary joint is damaged.
Therefore, in view of the above-described problems, the present invention is such that the strength of the rotary joint mounting portion is small, and the rotary joint does not swing greatly due to the rotational torque even if the fixture such as a bolt is loosened. .

The technical means of the present invention for solving this technical problem is provided with a revolving body provided with a working device, which is rotatable on a traveling device around a vertical pivot axis, and is provided on a traveling frame of the traveling device. In the rotary joint mounting structure in the swing work machine in which the rotary joint is mounted on the swing axis X,
A support stay projects upward from the bottom plate of the traveling frame, and the vertical center of the rotary joint is attached to the bottom plate of the traveling frame via the support stay ,
A pair of the support stays are provided with respect to the rotary joints, and the attachment portions of the rotary joints to the respective support stays are shifted vertically .

Another technical means of the present invention, the supporting stay is that are a pair provided et the front and rear of the rotary joint.
According to another technical means of the present invention, the rotary joint is provided with an L-shaped attachment member in a side view, and one piece of the L-shaped attachment member is fixed to the rotary joint side. The other piece is that it is placed and fixed on the rotary joint mounting portion of the support stay.

  According to the present invention, the strength of the rotary joint mounting portion can be small, and even if a fixture such as a bolt is loosened, the rotary joint does not swing greatly due to the rotational torque.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a backhoe exemplified as a turning work machine, and the backhoe 1 mainly includes an upper turning body 2 (airframe) and a lower traveling device 3.
Note that the traveling direction of the backhoe 1 (the left-right direction in FIG. 1) is referred to as the front-rear direction, and the lateral direction orthogonal to the front-rear direction (the paper penetration direction in FIG.
The swivel body 2 includes a swivel base 6 that is supported on the travel device 3 so as to be pivotable around a swivel axis X in the vertical direction, a work device (excavation device) 7 provided at the front of the swivel base 6, A driver's seat provided on the base 6 and various devices mounted on the swivel base 6 such as an engine, a fuel tank, a hydraulic pump, a hydraulic oil tank, a control valve, a radiator, an oil cooler, a reserve tank, and a battery. It is configured.

The swivel base 6 includes a swivel board 12 that is supported on the travel device 3 via a swivel bearing 11 so as to be pivotable about a swivel axis X, and a reinforcing member, various devices, and the like are mounted and fixed on the swivel board 12. And a rear part of the swivel base 6, and a rear part of the swivel base 6, and a rear part of the swivel base 6. Mainly composed of a counterweight 13.
A support bracket 16 projecting forward from the swivel base 6 is provided at the front portion of the swivel board 12, and a swing bracket 17 is supported on the support bracket 16 so as to be swingable left and right around the vertical axis.

A boom 18 supported by the swing bracket 17 so as to be swingable about the horizontal axis, an arm 19 supported so as to be swingable about the horizontal axis on the tip side of the boom 18, and a squeeze on the tip side of the arm 19. The working device 7 is mainly composed of a bucket 20 attached so as to be capable of dumping. The boom 18, the arm 19, and the bucket 20 are a boom cylinder 21, an arm cylinder 22, and a bucket cylinder 23, each of which is a hydraulic cylinder. It can be operated by.
2 to 7, the traveling device 3 includes a traveling frame 27, on both the left and right sides of the traveling frame 27, drive wheels 30 disposed at the rear, idlers 31 (idling wheels) disposed at the front, these A plurality of rollers 32 and a carrier roller 33 disposed between the driving wheel 30 and the idler 31 are rotatably supported, and the driving wheel 30, the idler 31, the carrier roller 33, and the rollers 32 are made of rubber or A pair of left and right crawler traveling bodies 36 configured to wrap around an iron endless belt-like crawler belt 34 and drive the driving wheel 30 with a hydraulic motor M or the like to circulate and rotate the crawler belt 34 are provided. A dozer 35 is provided at the front of the traveling device 3.

As shown in FIGS. 2 to 5, the traveling frame 27 is roughly configured to include a center frame 37 and side frames 38 disposed on the left and right sides of the center frame 37.
The center frame 37 has an upper plate 39 and a bottom plate 40, and is erected between opposed inner surfaces of the upper plate 39 and the bottom plate 40, and upper and lower edges thereof are fixed to the upper plate 39 and the bottom plate 40. The left and right side vertical walls 42, the rear vertical wall 43, and the front vertical wall 44 are provided. The upper plate 39, the bottom plate 40, and the vertical walls 42, 43, and 44 are formed of an iron plate or a steel plate. That is, the main part of the center frame 37 constitutes a three-dimensional structure in which the upper plate 39 and the bottom plate 40 are connected by the vertical walls 42, 43, 44.

The center portion of the center frame 37 is formed in a substantially rectangular shape in plan view. The center frame 37 rotatably supports the swivel body 3 via the swivel bearing 11 on the upper surface thereof, and a dozer 35 on the front portion thereof. I support it.
Specifically, a circular opening 46 penetrating in the vertical direction is formed in the upper plate 39 in the center portion of the center frame 37, and a bolt hole for attaching the swivel bearing 11 is formed around the opening 46. A large number are formed, and this portion constitutes the receiving portion A of the slewing bearing 11.

  As shown in FIGS. 10 and 11, the inner peripheral surface of the opening 46 in the upper plate 39 of the center frame 37 is formed in the vicinity of the tooth bottom edge 48 a of the inner gear 48 of the slewing bearing 11, and the inner peripheral surface of the opening 46 is The slewing bearing 11 is disposed radially outward from the tooth bottom edge 48a of the inner gear 48, and is located on the upper end side of the inner peripheral surface of the opening 46 from directly below the tooth bottom edge 48a of the inner gear 48. An accumulation prevention surface 49 inclined downward is formed. Accordingly, the soil that has fallen from the inner gear 48 side of the slewing bearing 11 does not fall on the edge of the opening 46 of the upper plate 39, slides down the accumulation prevention surface 49 and falls from the opening 46, so It will not accumulate on the edge of the opening 46 of the plate 39.

In addition, a pair of left and right support brackets 53 are provided at the front of the center portion of the center frame 37 at the center in the left-right direction, and a pair of left and right support brackets 54 are provided on both left and right sides of the support bracket 53. Yes.
The rear end side of the dozer cylinder 55 that moves up and down the dozer 35 is pivotally supported by the support bracket 54 at the center so as to be rotatable about the left and right axis. The left and right support brackets 54 swing the dozer 35. The rear end sides of the left and right support arms 57 that constitute the moving frame are pivotally supported so as to be rotatable around a horizontal axis.

The left and right side portions of the center frame 37 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 38.
The bottom plate 40 is formed of a single plate material from the center portion of the center frame 37 to the leg portion C1, and the left and right side portions of the bottom plate 40 constitute the lower surface of the leg portion C1. On the other hand, in the upper plate 39, a central portion 39A where the swivel bearing receiving portion A is formed and an upper wall 39B made of a plate material constituting the upper surface of the leg portion C1 are formed as separate members, which are welded or the like. It is fixed and integrated.

The center part of the center frame 37 is arranged at a position higher than the side frame 38, and the leg part C1 (outer part of the center frame 37) is lowered downward in the left-right direction as shown in FIG. It is formed in the shape of transition.
As shown in FIGS. 2, 5, and 6, the left and right side frames 38 include a main frame 59 that is disposed on the side of the center frame 37 and is connected to the leg portion C <b> 1 in the front-rear direction. A motor case 61 protrudes rearward from the rear end side of the main frame 59 via a connecting plate 60, and an idler holding portion 64 protrudes rearward from the front side of the main frame 59 via a connecting plate 63.

The upper surface of the main frame 59 of the side frame 38 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 37.
As shown in FIGS. 7 and 12, the side frame 38 (main frame 59) includes an upper wall 72, an inner wall 73 extending downward from the inner end side in the left-right direction of the upper wall 72, and the left-right direction of the upper wall 72. It is formed in a cross-sectional gate shape including an outer wall 74 extending downward from the outer end side, and the lower end side is opened.

The upper wall 72 is formed in an inclined shape that moves downward as it goes outward in the left-right direction, and the upper wall 39B (plate material) that constitutes the upper wall of the leg portion C1, as shown in FIG. Polymerized on the inner side of the wall 72 and fixed by welding or the like.
As shown in FIGS. 1, 3, and 4, the rolling wheel 32 is disposed at a lower part of the main frame 59 between the inner and outer walls 73 and 74 with a space in the front and rear direction. It is rotatably supported by. The carrier roller 33 is supported on the upper wall 72 of the main frame 59 so as to be rotatable around a horizontal axis.

As shown in FIGS. 2 to 5 and FIGS. 6 to 9, a notch groove 78 having a front opening and a U-shape in plan view is formed on the upper wall of the idler holding portion 64 in order to avoid interference with the idler 31. A yoke 86 is supported on the idler holding portion 64 so as to be slidable in the front-rear direction. The idler 31 is rotatably attached to the front portion of the yoke 86 via a support shaft 87 in the left-right direction. The idler 31 is supported in a state in which the idler 31 protrudes outward from the cutout groove 78 of the idler holding portion 64 in the vertical and forward directions.
2 is housed in front portions of the left and right main frames 59 in order to apply tension to the crawler belt 34 and adjust the tension.

The motor case 61 is formed in a box shape whose inner side in the left-right direction is open, and the hydraulic motor M is supported by the motor case 61 so as to project inward and outward through an attachment opening 68.
The motor case 61 is disposed inward in the left-right direction with respect to the main frame 59, and is fixed to the rear end of the main frame 59 by welding, a fastener, or other fixing means. As a result, the motor case 61 is attached in a protruding manner from the rear end of the outer portion of the center frame 37 to the rear end of the main frame 59 of the side frame 38.
A hydraulic motor M for driving the drive wheels 30 is held in the motor case 61 so as to protrude outward in the left-right direction. The drive wheels 30 are fixedly attached to the protruding portions, and the crawler belt 34 has a side frame 38 attached thereto. It is wound around the drive wheel 30, the idler 31, the roller wheel 32 and the carrier roller 18 so as to enclose it.

The drive wheel 30 is rotationally driven by a hydraulic motor M so as to be able to rotate forward and backward. In FIG. 1, the crawler belt 34 circulates counterclockwise by the counterclockwise rotation of the drive wheel 30 and the backhoe 1 moves forward. The crawler belt 34 circulates in the clockwise direction by the clockwise rotation of the drive wheel 30 and the backhoe 1 moves backward.
As shown in FIG. 3 to FIG. 5 and FIG. 12 to FIG. A plurality of mounting plates 95 to which the wheel 32 is attached are provided in the front-rear direction of the side frame 38 corresponding to the wheel 32, and are intermittently arranged at intervals in the front-rear direction of the side frame 38. The plurality of mounting plates 95 are formed in a U shape having a fitting recess 96 opened at one end in the front-rear direction, and each mounting plate 95 is between the lower ends of the pair of left and right side walls 73, 74 of the side frame 38. Are attached (fixed) to the side frame 38 by welding or the like. On the lower surface side of each mounting plate 95, a support body 98 that supports the wheel 32 rotatably around the left and right axis 97 is fixed by a fixture 99 such as a bolt, whereby the wheel 32 is mounted from the fitting recess 96. The plate 95 is supported so as to be rotatable in a state of projecting up and down.

  15 and 16, a lock mechanism 100 that locks the iron crawler belt 34 so as not to rotate is provided on the front end side of the left crawler belt 34 of the traveling device 3. The lock mechanism 100 includes a U-shaped lock plate 101, a lock shaft 102, a locking tool 103, and a lock pin 104. The lock plate 101 is formed in a U shape having a pair of left and right side plate portions 105 and a connecting plate portion 106 that connects the front end portions of the side plate portions 105 to the left and right, and an insertion hole 111 is formed in the pair of side plate portions 105. Is provided. The lock plate 101 is disposed on the front end portion side of the crawler belt 34 so as to surround the front side of the front end portion and the left and right outer sides of the crawler belt 34. A lock shaft 102 is connected between a pair of left and right side plate portions 105 of the lock plate 101. The lock shaft 102 is inserted in the left-right direction from the outer side of one (left side) side plate part 105 through the insertion hole 111 toward the other side plate part 105, and penetrates the idler 31 left and right through the through hole 109 of the idler 31. Then, it is inserted so as to penetrate the other (right) side plate portion 105, and the locking rod 108 of the locking device 103 is inserted into the insertion end portion protruding outward from the insertion end 107, and in this state the locking device 103 is locked. As a result, the lock shaft 102 is prevented from coming off from the other side plate portion 105 by the lock 103.

  A lock pin 104 protrudes from the connecting plate portion 106 of the lock plate 101, and the lock pin 104 is inserted into the opening hole 110 of the crawler belt 34, and the lock shaft 102 includes one side plate portion 105 and an idler 31. The lock pin 104 is held in a state of being inserted through the opening hole 110 of the crawler belt 34 by being inserted into the other side plate portion 105 and prevented from being removed by the locking device 103. Thereby, the crawler belt 34 is locked by the lock mechanism 100 so as not to rotate with respect to the left side frame 38.

In FIGS. 2, 4, 5, 8, and 9, a rotary joint 117 is provided on the turning axis X of the traveling frame 27 of the traveling device 3. The upper end of the rotary joint 117 protrudes toward the revolving structure 2 through the opening 46 of the upper plate 39. The rotary joint 117 includes a cylindrical outer sleeve 119 and an inner shaft 120 that is rotatably inserted into the outer sleeve 119, and a plurality of oil passages are formed therein.
Further, the head of the inner shaft 120 protrudes into the swing body 3, and hydraulic piping from the hydraulic pump in the swing body 3 is connected via a control valve. A connection port is provided on the outer peripheral surface of the outer sleeve 119. The hydraulic hoses 125 from the left and right traveling motors M, the dozer cylinder 55, and the like are connected to each other.

  The bottom plate 40 of the center frame 37 is formed with an opening 127 used for inspection in the center frame 37, and a cover body 128 is detachably attached to the bottom plate 40 so as to close the opening 127 from below. A pair of front and rear support stays 129 protrudes upward from the bottom plate 40 of the frame 27. The pair of support stays 129 are disposed before and after the rotary joint 117. Each support stay 129 has a U-shaped fixing portion 130 and a rotary joint mounting portion 131 protruding upward in an L shape from the fixing portion 130, and the fixing portion 130 is welded before and after the opening 127 of the bottom plate 40. Or it is attached with fixing tools, such as a volt | bolt. A central portion of the rotary joint 117 in the vertical direction is attached to the bottom plate 40 of the traveling frame 27 via the pair of left and right support stays 129.

  The attachment portions 135 of the rotary joint 117 to the respective support stays 129 are disposed so as to be vertically shifted from each other before and after the central portion of the rotary joint 117 in the vertical direction. Front and rear of the rotary joint 117 are provided with attachment members 132 that are L-shaped in side view. A pair of front and rear mounting members 132 are provided corresponding to the support stays 129, and upper portions (one piece) of the pair of mounting members 132 are respectively fixed to a pair of mounting portions 135 of the rotary joint 117 by a fixing member 133 such as a bolt. Yes. The other part (lower part) of each attachment member 132 is placed on the horizontal upper part of the rotary joint attachment part 131 of each support stay 129 and fixed by a fixture 137 such as a bolt.

  According to the above embodiment, in order to prevent the backhoe 1 from being stolen, as shown in FIGS. 15 and 16, the lock plate 101 is surrounded by the front side of the front end portion of the crawler belt 34 of the traveling device 3 and the left and right outer sides. In this way, the lock pin 104 is inserted into the opening hole 110 of the crawler belt 34 and disposed on the front end side of the crawler belt 34, and then the lock shaft 102 is moved from the outer side of the one side plate portion 105 to the other side plate. It is inserted in the left-right direction toward the part 105, penetrates through the idler 31 left and right, and penetrates through the other side plate part 105, and is locked to the insertion end part protruding outward through the attachment hole 107. The locking rod 108 of 103 is inserted, and the locking tool 103 may be locked in this state. Thereby, the crawler belt 34 is easily locked with respect to the side frame 38 so that the crawler belt 34 cannot rotate, and the backhoe 1 can be prevented from being stolen.

In order to unlock the lock mechanism 100, the locking device 103 is removed from the insertion end of the lock shaft 102, and then the lock shaft 102 is pulled toward one side plate portion 105, and the other side plate portion 105, After pulling out from the idler 31 and one side plate part 105 side, the lock plate 101 can be pulled forward and the lock pin 104 can be removed from the opening hole 110 of the crawler belt 34, and the lock by the lock mechanism 100 can be easily removed. be able to.
Further, since the mounting plates 95 for mounting the rolling wheels 32 are intermittently arranged at intervals in the front-rear direction of the side frame 38, the mounting plates 95 are small and light weight. The total weight of all the mounting plates 95 is considerably lighter than that of the conventional mounting plate that is integrated with the plurality of rolling wheels 32. Easy to handle and easy to attach to the side frame 38. In addition, since the fitting recesses 96 corresponding to the rolling wheels 32 are also formed on the separate mounting plates 95, the interval between the fitting recesses 96 can be easily adjusted. From this point, the mounting plate 95 can be easily attached to the side frame 38.

  In addition, since the central portion of the rotary joint 117 in the vertical direction is attached to the bottom plate 40 of the traveling frame 27 via the support stay 129, when the rotational torque is applied to the rotary joint 117, the rotational torque is The joint 117 acts so that the central portion in the vertical direction is swung about the fulcrum, so that the magnitude of the swing of the bottom surface side to the upper end side of the rotary joint 117 can be halved. The swing of the rotary joint 117 can be suppressed well. For this reason, it is no longer necessary to give the rotary joint 117 supporting portion of the bottom plate 40 of the traveling frame 27, the support stay 129, etc. high strength. Also, a pair of support stays 129 are provided in front of and behind the rotary joint 117, and the attachment portions 135 of the rotary joint 117 to the respective support stays 129 are shifted up and down with respect to each other. Oscillation can be effectively prevented, and also from this point, oscillation of the rotary joint 117 can be suppressed. In addition, even if a fixture such as a bolt is loosened, the rotary joint 117 does not swing greatly due to the rotational torque, thereby preventing the hydraulic hose 125 connected to the rotary joint 117 from being damaged.

FIG. 17 shows another embodiment in which the crawler belt 34 is made of rubber instead of the iron shown in FIG. The other points are the same as those in the above embodiment.
FIG. 18 shows another embodiment, in which the inner peripheral surface of the opening 46 is arranged so as to protrude radially inward from the root edge 48a of the inner gear 68 of the slewing bearing 11, and On the upper end side of the circumferential surface, an accumulation preventing surface 49 is formed that is inclined downward from directly below the tooth bottom edge of the inner gear 68 toward the inside of the opening 46. The other points are the same as those in the above embodiment. Also in this case, the soil that has fallen from the inner gear 68 side of the slewing bearing 11 does not fall on the edge of the opening 46 of the upper plate 39, but slides down the accumulation prevention surface 49 and falls from the opening 46. Will not accumulate on the edge of the opening 46 of the upper plate 39.

It is a side view of the backhoe which shows one embodiment of the invention in this application. It is a top view of the swivel of the backhoe. It is side surface sectional drawing of the swivel of the backhoe. It is other side surface sectional drawing of the swivel of the backhoe. It is a top view of the traveling frame of the backhoe. It is a front view of the traveling frame of the backhoe. It is a side view of the traveling frame of the backhoe. It is a side view of the rotary joint part. It is a top view of the rotary joint part. It is side sectional drawing of the center frame front part. It is side sectional drawing of the center frame rear part. It is the sectional view on the AA line of the same FIG. It is a side view of the same wheel part. It is a side view of the other wheel part. It is a plane sectional view of the lock mechanism part. It is a side view of the lock mechanism part. It is a plane sectional view of a lock mechanism portion showing other embodiments. It is side sectional drawing of the upper end part of the center frame front part which shows other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Backhoe 2 Revolving body 3 Traveling apparatus 27 Traveling frame 32 Rolling wheel 38 Side frame 39 Top plate 40 Bottom plate 73 Inner side wall 74 Outer side wall 95 Mounting plate 96 Fitting recessed part 97 Right and left shaft 117 Rotary joint 129 Support stay 132 Mounting member 135 Mounting part

Claims (3)

A revolving body (2) provided with a work device (7) is provided on a traveling device (3) so as to be rotatable about a vertical pivot axis (X), and a traveling frame (27) of the traveling device (3). In the rotary joint mounting structure in the swing working machine in which the rotary joint (117) is mounted on the swing axis X of
A support stay (129) is provided on the bottom plate (40) of the traveling frame (27) so as to project upward, and the center portion in the vertical direction of the rotary joint (117) is interposed between the bottom plate of the traveling frame (27) and the support stay (129). Attached to (40) ,
A pair of the support stays (129) is provided with respect to the rotary joint (117), and the mounting portion (135) of the rotary joint (117) to each support stay (129) is shifted up and down. The rotary joint mounting structure in the swing work machine. It said support stay (129) is mounted structure of the rotary joint in rotary working machine according to claim 1, characterized in that is a pair provided et the front and rear of the rotary joint (117).   The rotary joint (117) is provided with an L-shaped attachment member (132) in a side view, and a piece of the L-shaped attachment member (132) is fixed to the rotary joint (117) side, and the attachment member ( 132) The rotary joint in the swivel working machine according to claim 1 or 2, wherein the other piece is mounted and fixed to the rotary joint mounting portion (131) of the support stay (129). Mounting structure.

Images