JP4236645B2 - 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 of the joint is fixed to the bottom plate of the traveling frame with a fastener such as a bolt via a mounting bracket, etc., and the fastener such as a bolt is inserted into the bottom plate of the traveling frame from the bottom upward and fixed. Or a fastener such as a bolt is inserted into the bottom plate of the traveling frame from the upper side to the lower side to be fastened and fixed (for example, Patent Document 1) Patent Document 2).
JP 2001-271380 A JP-A-11-93209

By the way, when assembling the rotary joint to the traveling frame, the rotary joint is mounted on the bottom plate of the traveling frame from the upper side and is fixed with a fastener such as a bolt with the revolving unit not supported on the traveling device. In addition, when attaching and detaching the rotary joint from the traveling frame for maintenance or the like, the rotary joint is usually taken out and attached from the lower side of the traveling frame because the rotating body is supported on the traveling device. It is.
Therefore, conventionally, when fasteners such as bolts are inserted into the bottom plate of the traveling frame from above and tightened and fixed, the fasteners are rotated using a tool or the like from above. It is inconvenient to place the rotary joint on the bottom plate of the traveling frame from the upper side and fix it with bolts or other fasteners, and attach the rotary joint smoothly to the bottom plate of the traveling frame. Is no longer possible.

In addition, when fasteners such as bolts are inserted and tightened downward from the upper side to the bottom plate of the traveling frame, the fasteners can be rotated using a tool or the like from the lower side. Because it becomes difficult, it is inconvenient to remove bolts and other fasteners for maintenance, etc., and to remove the rotary joint from the lower side of the traveling frame. Remove the rotary joint smoothly or remove the rotary joint from the lower part of the traveling frame. It was troublesome to insert the rotary joint by inserting from the side.
Therefore, in view of the above problems, the present invention provides a rotary joint when the rotary joint is assembled to the traveling frame from the upper side, or when the rotary joint is removed from or attached to the traveling frame from the lower side for maintenance or the like. Can be easily attached and detached with a fastener.

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,
A support stay protrudes upward from the bottom plate of the traveling frame, an attachment member protrudes from the rotary joint, an intermediate stay is provided between the support stay and the attachment member, and the intermediate stay is placed on the support stay. And is fastened and fixed by the first fastener, and an attachment member is placed on the intermediate stay and fastened and fixed by the second fastener so that the rotary joint is attached to the bottom plate via the support stay and the intermediate stay.
The first fastener is fastened and fixed to the support stay and the intermediate stay by inserting from below to above or from above to below, and the second fastener is upside down with respect to the first fastener. As described above, the intermediate stay and the mounting member are inserted and fixed from the upper side downward or from the lower side upward ,
The support stay 79, the intermediate stay 83, and the attachment member 82 are provided in pairs with respect to the rotary joint 67, and the pair of attachment members 82 are protruded from the rotary joint 67 so as to be shifted from each other up and down. is there.

In addition, another technical means of the present invention is that the vertical center portion of the rotary joint is attached to the bottom plate of the traveling frame via the attachment member, the intermediate stay, and the support stay.
According to another technical means of the present invention, the pair of support stays 79, the pair of intermediate stays 83, and the pair of attachment members 82 are provided on the front and rear of the rotary joint 67, respectively. The point is that the joint 67 projects forward and backward .
Further, according to another technical means of the present invention, the pair of intermediate stays 83 includes a fixing portion 86 fixed to the support stay 79 and an attachment portion 87 protruding from the fixing portion 86 toward the rotary joint 67. A pair of restricting portions 88 are provided on both sides of the fixing portion 86, the fixing portion 86 of the intermediate stay 83 is placed on the attaching portion 81 of the support stay 79, and the pair of restricting portions 88 is an attaching portion of the support stay 79. The intermediate stay 83 is disposed on both sides of the 81 and restricts the movement of the intermediate stay 83 relative to the support stay 79 .

  According to the present invention, before attaching and fixing the rotary joint, the weight of the rotary joint can be supported on the bottom plate of the traveling frame via the support stay and the intermediate stay, and the rotary joint is moved from the upper side to the traveling frame. When assembling, either the first fastener or the second fastener can be easily operated from the upper side, and the rotary joint can be removed from the lower frame from the lower side for maintenance or the like. When attaching, the other of the first fastener or the second fastener can be easily operated from the lower side. Therefore, even when the rotary joint is assembled to the traveling frame from the upper side, or when the rotary joint is detached or attached to the traveling frame from the lower side for maintenance or the like, the rotary joint can be easily attached and detached, Very convenient.

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 4, the traveling device 3 includes a traveling frame 27, and a crawler belt 34 is wound around the driving wheel 30 and the idler 31 on both the left and right sides of the traveling frame 27. A pair of left and right crawler traveling bodies 36 configured to drive the crawler belt 34 in a circulating manner and the like are provided. A dozer 35 is provided at the front of the traveling device 3.

As shown in FIGS. 2 to 4, 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.

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.
2 to 6, a rotary joint 67 is provided on the turning axis X of the traveling frame 27 of the traveling device 3. The upper end of the rotary joint 67 projects toward the revolving structure 2 through the opening 46 of the upper plate 39. The rotary joint 67 is composed of a cylindrical outer sleeve 69 and an inner shaft 70 that is rotatably inserted into the outer sleeve 69, and a plurality of oil passages are formed therein.

Further, the head of the inner shaft 70 protrudes into the swing body 3, and hydraulic piping from the hydraulic pump in the swing body 3 is connected via a control valve, and a connection port is provided on the outer peripheral surface of the outer sleeve 69. The hydraulic hoses 75 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 77 used for checking the inside of the center frame 37. A cover body 78 is detachably attached to the bottom plate 40 by a fixture 76 so as to close the opening 77 from below. Is attached.

A pair of front and rear support stays 79 project upward from the bottom plate 40 of the traveling frame 27. A pair of front and rear mounting members 82 project in the front and rear direction at the center of the rotary joint 67 in the vertical direction, and a pair of front and rear intermediate stays 83 are provided between the pair of front and rear support stays 79 and the pair of front and rear mounting members 82. It has been. A central portion in the vertical direction of the rotary joint 67 is attached to the bottom plate 40 of the traveling frame 27 via an attachment member 82, an intermediate stay 83, and a support stay 79.
The pair of support stays 79 are arranged in front of and behind the rotary joint 67, and each support stay 79 has a U-shaped fixing portion 80 and a mounting portion 81 protruding upward from the fixing portion 80 in an L shape. The fixing portion 80 is attached to the front and rear of the opening 77 of the bottom plate 40 by a fixture such as welding or a bolt.

The pair of attachment members 82 are shifted from each other up and down on the rotary joint 67 so as to protrude forward and backward, and each attachment member 82 is formed in a horizontal plate shape.
The pair of intermediate stays 83 are disposed in front of and behind the rotary joint 67, and each intermediate stay 83 includes a fixing portion 86 and an attachment portion 87 protruding from the fixing portion 86 toward the rotary joint 67 in the front-rear direction. A pair of left and right restricting portions 88 are fixed to the left and right sides of the fixing portion 86 so as to protrude vertically. The fixing portion 86 of the intermediate stay 83 is placed on the mounting portion 81 of the support stay 79 and is fastened and fixed by a first fastener 91 constituted by a bolt. The pair of left and right restricting portions 88 are disposed on the left and right sides of the mounting portion 81 of the support stay 79, and when the fixing portion 86 of the intermediate stay 83 is placed on the mounting portion 81 of the support stay 79, the intermediate stay 83 is supported by the support stay 79. 77 is restricted from moving to the left and right.

The protruding end side of the attachment member 82 is placed on the attachment portion 87 of the intermediate stay 83 and is fastened and fixed by a second fastener 92 constituted by a bolt. Thus, the rotary joint 67 is attached to the bottom plate 40 via the support stay 79 and the intermediate stay 83.
The first fastener 91 is fastened and fixed to the mounting portion 81 of the support stay 79 and the fixing portion 86 of the intermediate stay 83 through the mounting hole 94 and the screw hole 95 from the lower side upward. . The second fastener 92 is attached to the protruding end side of the attachment member 82 and the attachment portion 87 of the intermediate stay 83 via the attachment hole 97 and the screw hole 98 so as to be in the opposite direction to the first fastener 91. It is fastened and fixed by being inserted downward from the upper side. Accordingly, the insertion directions of the first and second fasteners 91 and 92 with respect to the support stay 79 and the intermediate stay 83 or the intermediate stay 83 and the attachment member 82 are set in opposite directions, and the first and second fasteners 91 and 91 are fastened. By tightening the tool 92, the vertical center portion of the rotary joint 67 is attached to the bottom plate 40 of the traveling frame 27 via a pair of left and right support stays 79 and an intermediate stay 83. The mounting hole 94 is formed through the mounting portion 81 of the support stay 79 in the vertical direction, and the screw hole 95 is formed in the fixing portion 86 of the intermediate stay 83 in the vertical direction. The attachment hole 97 is vertically formed on the protruding end side of the attachment member 82, and the screw hole 98 is formed in the attachment portion 87 of the intermediate stay 83 in the vertical direction.

  According to the above embodiment, when the rotary joint 67 is assembled to the traveling frame 27, the rotary joint 67 is connected to the traveling frame 27 from the upper opening 46 in a state where the revolving unit 2 is not supported on the traveling device 3. Put it on the support stay 79 and fix it. At this time, the intermediate stay 83 is placed on the support stay 79 and is fastened and fixed by the first fastener 91, and in this state, the protruding end side of the mounting member 82 of the rotary joint 67 inserted into the traveling frame 27 from above. Is mounted on the mounting portion 87 of the intermediate stay 83, whereby the weight of the rotary joint 67 is supported by the bottom plate 40 via the intermediate stay 83 and the support stay 79, and then the second fastener 92 is inserted into the projecting end side of the mounting member 82 and the mounting portion 87 of the intermediate stay 83 through the mounting hole 97 and the screw hole 98 from the upper side to be fastened and fixed. 92 can be easily rotated from above using a tool such as a wrench, and the rotary joint 67 can be easily and securely attached to the bottom plate 40 of the traveling frame 27. That.

Further, when the rotary joint 67 is detached from the traveling frame 27 for maintenance or the like, the rotary joint 67 is taken out or attached from the lower side of the traveling frame 27 while the revolving unit 2 is supported on the traveling device 3. do it. At this time, the cover 78 is removed from the bottom plate 40, a tool such as a wrench is inserted from the opening 77, and the first fastener 91 is rotated and removed from the lower side, and then the intermediate stay 83 is attached to the attachment member 82. In this state, the rotary joint 67 is rotated while being lifted up slightly, the intermediate stay 83 is removed from the support stay 79, and the rotary joint 67 is taken out from the opening 77 to the lower side of the traveling frame 27. The one fastening tool 91 can be easily removed and the rotary joint 67 can be easily taken out downward. Further, when the rotary joint 67 is attached after the maintenance or the like is completed, the rotary joint 67 is inserted into the traveling frame 27 through the opening 77 with the intermediate stay 83 attached to the attachment member 82, and The fixing portion 86 is placed on the attachment portion 81 of the support stay 79, and the first fastener 91 is attached to the attachment portion 81 of the support stay 79 and the fixing portion 86 of the intermediate stay 83 with an attachment hole 94 and a screw hole 95. The rotary joint 67 can be easily attached by simply tightening the first fastening tool 91 from the lower side.

Therefore, when the rotary joint 67 is assembled to the traveling frame 27 from the upper side, or when the rotary joint 67 is removed from or attached to the traveling frame 27 from the lower side for maintenance or the like, the first fastener 91 or the second By smoothly rotating the fastener 92, the rotary joint 67 can be easily attached and detached.
Further, since the central portion of the rotary joint 67 in the vertical direction is attached to the bottom plate 40 of the traveling frame 27 via the support stay 79, when a rotational torque is applied to the rotary joint 67, this rotational torque is The joint 67 acts so that the central portion in the vertical direction swings around the fulcrum, and therefore, the magnitude of the swing from the bottom surface side to the upper end side of the rotary joint 67 can be halved. The swing of the rotary joint 67 can be suppressed well. For this reason, it is no longer necessary to give the mounting portion of the rotary joint 67 of the bottom plate 40 of the traveling frame 27, the support stay 79, etc. high strength. Further, the support stay 79, the intermediate stay 83, and the mounting member 82 are provided in a pair before and after the rotary joint 67, and the mounting member 82 of the rotary joint 67 to each support stay 79 is shifted up and down with respect to each other. It is possible to effectively prevent the joint 67 from swinging about the specific position as a fulcrum, and also from this point, the swing of the rotary joint 67 can be suppressed. Further, even if the fasteners 91, 92, etc. are loosened, the rotary joint 67 does not oscillate greatly due to the rotational torque, thereby preventing the hydraulic hose 75 connected to the rotary joint 67 from being damaged.

  In the above-described embodiment, the first fastener 91 constituted by the bolt is inserted and fixed in the upward direction from the lower side with respect to the support stay 79 and the intermediate stay 83, and the second fastener constituted by the bolt. 92 is clamped and fixed to the intermediate stay 83 and the mounting member 82 by passing from the lower side upward, but instead, the first fastener 91 is attached to the support stay 79 and the intermediate stay 83. The second fastener 92 may be inserted from the upper side downward and tightened and fixed, and the second fastener 92 may be inserted into the intermediate stay 83 and the attachment member 82 from the upper side downward to be fixed. Of course, the first fastener 91 and the second fastener 92 may be configured by bolts, nuts, fastening pins, or other fasteners instead of bolts.

  In the above-described embodiment, the support stay 79, the intermediate stay 83, and the mounting member 82 are provided in pairs on the front and rear of the rotary joint 67, but instead, the support stay 79, the intermediate stay 83, and the mounting member are provided. Only one 82 may be provided, or three or more intermediate stays 83 and three attachment members 82 may be provided.

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 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 top view of the rotary joint part. It is a side view of the rotary joint part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Backhoe 2 Revolving body 3 Traveling apparatus 27 Traveling frame 40 Bottom plate 67 Rotary joint 79 Support stay 82 Mounting member 83 Intermediate stay 91 First fastener 92 Second fastener

Claims (4)

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 rotary working machine in which the rotary joint (67) is mounted on the rotary axis (X) of
A support stay (79) projects upward from the bottom plate (40) of the traveling frame (27), and an attachment member (82) projects from the rotary joint (67). The support stay (79) and the attachment member (82) ), An intermediate stay (83) is provided, and the intermediate stay (83) is placed on the support stay (79) and fastened and fixed by the first fastener (91), and the rotary joint (67) is attached. An attachment member (82) is placed on the intermediate stay (83) so as to be attached to the bottom plate (40) via the support stay (79) and the intermediate stay (83), and tightened by the second fastener (92). Fixed,
The first fastener (91) is fastened and fixed to the support stay (79) and the intermediate stay (83) by inserting from below to above or from above to below, and the second fastener (92) is fixed. The first fastener (91) is inserted into the intermediate stay (83) and the mounting member (82) so as to be upside down and clamped and fixed from the upper side to the lower side or from the lower side to the upper side ,
The support stay (79), the intermediate stay (83), and the attachment member (82) are provided in pairs with respect to the rotary joint (67), and the pair of attachment members (82) are connected to the rotary joint (67). A rotary joint mounting structure in a swing work machine, wherein the rotary joint is protruded by being vertically shifted .   The vertical center of the rotary joint (67) is attached to the bottom plate (40) of the traveling frame (27) via the attachment member (82), the intermediate stay (83) and the support stay (79). The rotary joint mounting structure in the swing working machine according to claim 1, The pair of support stays (79), the pair of intermediate stays (83), and the pair of attachment members (82) are respectively provided before and after the rotary joint (67), and the pair of attachment members (82) 67) The rotary joint mounting structure in the swing working machine according to claim 1 or 2, wherein the rotary joint mounting structure projects in the front-rear direction at 67). The pair of intermediate stays (83) includes a fixing portion (86) fixed to the support stay (79) and an attachment portion (87) protruding from the fixing portion (86) toward the rotary joint (67). A pair of restricting portions (88) are provided on both sides of the fixing portion (86), and the fixing portion (86) of the intermediate stay (83) is placed on the mounting portion (81) of the support stay (79). The restricting portion (88) is disposed on both sides of the attachment portion (81) of the support stay (79) and restricts the intermediate stay (83) from moving relative to the support stay (79). mounting structure of the rotary joint in rotary working machine according to any of claims 1 to 3.

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