JP5074130B2 - Construction machinery - Google Patents

Description

  The present invention relates to a construction machine such as a hydraulic crane or a hydraulic excavator provided with a center joint for distributing hydraulic oil between a lower traveling body and an upper swing body, for example.

  Generally, when a material is transported from the ground to a high place at a construction site or the like, a construction machine such as a hydraulic crane is used. This hydraulic crane is composed of a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body via a revolving device, and a work device provided on the upper revolving body. ing. The lower traveling body is roughly composed of a track frame with a turning device attached to the center and crawler devices provided on both the left and right sides of the track frame, and each crawler device is driven by a traveling hydraulic motor. A drive wheel, a driven wheel, and a crawler belt wound around the drive wheel and the driven wheel.

  On the other hand, the upper revolving structure has a revolving frame mounted on the track frame of the lower traveling structure via a revolving device, and a cab is provided on the right side of the front portion on the revolving frame, and on the rear side. A counterweight is installed. An engine that drives a hydraulic pump is mounted on the swing frame.

  Further, since the lower traveling body and the upper swinging body are relatively swiveled, the upper swinging body is allowed to swivel on the lower traveling body at the turning center of the lower traveling body or the upper swinging body. On the other hand, a center joint that circulates hydraulic oil between the hydraulic pump and the traveling hydraulic motor is attached (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 60-186369

  In the prior art according to Patent Document 1, a center joint insertion hole is provided in a swing frame of an upper swing body, and the center joint is attached to the center joint insertion hole. In this case, a plurality of bolt holes are formed around the center joint insertion hole according to the pitch circle diameter of each bolt hole provided in the center joint to be attached. Thereby, the center joint can be bolted to the turning frame.

  First, when the types of various hydraulic actuators provided on the lower traveling body are different or when the hydraulic actuator is installed as an option, the specifications such as the number of hydraulic pipes and the flow rate of hydraulic oil differ. Must be changed to another center joint.

  By the way, in the prior art by patent document 1, since the bolt hole is formed in the exclusive position according to the center joint to attach to a turning frame, it cannot respond to the change of a center joint.

  For this reason, when changing the center joint, the entire revolving frame must be replaced, and even if the specifications of the upper revolving structure are the same, the revolving frame cannot be shared. Further, when the center joint is provided in the lower traveling body, there is a problem that the lower traveling body cannot be shared for the same reason.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to attach a center joint having a different specification to the lower traveling body or the upper swinging body. It is to provide a construction machine that can be shared.

A construction machine according to the present invention includes a lower traveling body capable of self-propelling by a traveling hydraulic motor, and an upper revolving body provided with a prime mover that is mounted on the lower traveling body via a revolving device so as to be capable of swiveling and drives a hydraulic power source. A center joint insertion hole at the turning center of the lower traveling body , and the center joint insertion hole allows the lower traveling body and the upper turning body to relatively rotate. A center joint that circulates hydraulic oil between a power source and an actuator including the travel hydraulic motor, the center joint being provided so as to surround the spindle and the spindle. a rotatable outer body, that has a hydraulic fluid passage for circulating hydraulic fluid between the spindle and the body.

In order to solve the above-mentioned problem, the feature of the configuration adopted by the invention of claim 1 is that the center joint is a large-sized center in which the spindle can be directly attached to the center joint insertion hole on the lower traveling body side. A relay having a plurality of types including a joint and a small center joint having a shape smaller than that of the large center joint, and used when the spindle of the small center joint is attached to the center joint insertion hole on the lower traveling body side. comprising a plate, the relay plate comprises an annular plate, in the center provided an insertion hole for small center joint the spindle of the small center joint is inserted, the lower traveling body side of the spindle of the small center joint when attached to the center joint insertion hole of In that a configuration of interposing the relay plate between said spindle and said center joint insertion hole.

According to a second aspect of the present invention, a plurality of bolt holes for mounting the large-sized center joint are provided around the center joint insertion hole with a large pitch circle diameter, and the relay plate is provided around the center joint insertion hole. A plurality of outer bolt holes having a large pitch circle diameter corresponding to each bolt hole are provided, and an inner bolt hole for mounting the small center joint on the inner peripheral side of each outer bolt hole has a small pitch circle diameter. There is a configuration in which a plurality are provided.

  The invention of claim 3 is that the outer bolt holes and the inner bolt holes are arranged so as to be displaced in the circumferential direction with respect to the relay plate.

According to the first aspect of the present invention, as the center joint, the large center joint capable of directly attaching the spindle to the center joint insertion hole on the lower traveling body side, and the small center joint having a smaller shape than the large center joint are provided. And a relay plate used when the spindle of the small center joint is attached to the center joint insertion hole on the lower traveling body side . Therefore, it is possible to mount the spindle of the small center joint to the center joint insertion hole by interposing the relay plate to the center joint insertion hole of the lower traveling body side.

Thus, when mounting the spindle of a large center joint to the center joint insertion hole of the lower traveling body side, it can be attached directly to the spindle of the large-sized center joint to the center joint insertion hole. On the other hand, when installing the spindle of the small center joint, a relay plate is interposed between the center joint insertion hole and the spindle of the small center joint , so that the spindle of the small center joint is inserted into the center joint insertion hole via the relay plate. Can be installed.

As a result, both the spindle of the large center joint and the spindle of the small center joint can be attached to the center joint insertion hole of the same lower traveling body. Moreover, when mounting the spindle further small center joint than small center joint, by providing a relay plate corresponding to the spindle of the center joint, it is attached to the center joint insertion hole of the lower traveling body side in the same manner Can do. Thereby, even when the center joint to be attached is different, the lower traveling body can be used in common, so that the productivity can be improved and the manufacturing cost can be reduced.

According to the invention of claim 2, a plurality of bolt holes for attaching a large center joint are provided around the center joint insertion hole with a large pitch circle diameter, and each bolt around the center joint insertion hole is provided on the relay plate. A structure in which a plurality of outer bolt holes having a large pitch circle diameter corresponding to the holes are provided, and a plurality of inner bolt holes having a small pitch circle diameter for attaching the small center joint to the inner peripheral side of the outer bolt holes. It is said.

Accordingly, when the spindle of the large center joint is attached to the center joint insertion hole, the spindle of the large center joint can be directly bolted to each bolt hole around the center joint insertion hole.

On the other hand, when the spindle of the small center joint is attached to the center joint insertion hole, the outer bolt holes of the relay plate are aligned with the bolt holes around the center joint insertion hole and bolted. Also, a small center joint spindle is bolted to each inner bolt hole of the relay plate.

As a result, both the large center joint and the small center joint can be selectively attached to the center joint insertion hole of the common lower traveling body. In addition, by preparing other relay plates having different pitch circle diameter dimensions of the inner bolt holes, a plurality of types of center joints different from these center joints can be attached.

  According to the invention of claim 3, each outer bolt hole and each inner bolt hole are arranged so as to be shifted in the circumferential direction with respect to the relay plate. They can be arranged apart from each other, and a space for handling tools can be secured. Also, the pitch circle diameter of each inner bolt hole can be made large and close to the pitch circle diameter of each outer bolt hole, and more types of center joints can be selectively attached.

  Hereinafter, as a construction machine according to an embodiment of the present invention, a hydraulic crane provided with a crawler type lower traveling body will be described as an example and described in detail with reference to the accompanying drawings.

  1 to 15 show a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a crawler type hydraulic crane used for transporting a load such as a material to a high place. The hydraulic crane 1 includes a lower traveling body 11 that can be self-propelled, an upper revolving body 3 that is turnably mounted on the lower traveling body 11 via a revolving device 2, and a front side of the upper revolving body 3. And the working device 4 provided in the main body. Further, a hook 4A for hanging a load is suspended from the front end portion of the working device 4 so as to be movable upward and downward.

  As shown in FIGS. 1 and 2, the upper revolving unit 3 includes a revolving frame 5 that forms a support structure, a cab 6 that is provided on the right front side of the revolving frame 5 and on which an operator rides, and the revolving frame 5 A counterweight 7 mounted on the rear, a plurality of units located in the center of the revolving frame 5 and arranged in the front and rear directions, for example, 4 winches 8A to 8D, and the left rear side of the revolving frame 5 An engine 9 as a prime mover mounted on the engine 9 and a hydraulic pump 10 attached to the engine 9 are roughly configured.

  Here, the turning frame 5 is formed with a center joint insertion hole 5B through which a body 23 of a large center joint 21 or a body 33 of a small center joint 31 described later is inserted at the turning center of the bottom plate 5A (see FIG. 4). . The hydraulic pump 10 constitutes a hydraulic pressure source together with a hydraulic oil tank (not shown) and the like, and is driven by the engine 9 to drive the hydraulic oil of each winch 8A to 8D using hydraulic oil as pressure oil. This is supplied to the hydraulic cylinder 16 of the traveling body 11, the traveling hydraulic motor 17, and the like.

  Next, reference numeral 11 denotes a self-propelled lower traveling body constituting the lower portion of the hydraulic crane 1. As shown in FIGS. 1 and 3, the lower traveling body 11 includes a track frame 12, a hydraulic cylinder 16, a traveling hydraulic motor 17, a driving wheel 18, a driven wheel 19, and a crawler belt 20.

  Reference numeral 12 denotes a track frame of the lower traveling body 11. The track frame 12 includes a center frame 13 formed in a box shape at the center, and left and right side frames 14 disposed on the left and right sides of the center frame 13 and extending in the front and rear directions. (Only the right side is shown in FIG. 1) and the like.

  The center frame 13 is formed in a rectangular parallelepiped shape extending in the front and rear directions, and the turning device 2 is mounted on the upper surface plate 13A around the turning center O. In addition, a disc-shaped mounting plate 13B is integrally fixed to the center of the upper surface plate 13A, and a large center joint 21 described later is disposed at the center of the mounting plate 13B as shown in FIGS. A petal-like center joint insertion hole 13C through which the spindle 22 or the spindle 32 of the small center joint 31 is inserted is attached. Further, around the center joint insertion hole 13C, four bolt holes 13D are formed in the same arrangement as each bolt hole 22B provided in the spindle 22 of the large center joint 21.

  Here, the center joint insertion hole 13C includes, for example, four protrusions 13C1 protruding inward in the radial direction at intervals of 90 degrees, and a recess 13C2 positioned between the protrusions 13C1 and curved in an arc shape. It has a petal shape. As shown in FIGS. 7 and 11, the four protrusions 13C1 are for mounting the flange 22A or the relay plate 36 of the spindle 22 of the large-sized center joint 21, and the above-described bolt holes 13D are formed respectively. . Further, the four recesses 13C2 are fixed so that a small-sized center joint 31 (to be described later) is fixed to prevent the tip of a bolt 37 protruding downward from the relay plate 36 from coming into contact when the relay plate 36 is attached to the mounting plate 13B. It has a concave curved surface.

  On the other hand, each bolt hole 13D of the center frame 13 is formed as, for example, a female screw, and a bolt 24 described later is screwed thereto. Further, as shown in FIG. 5, four bolt holes 13D are provided, for example, at intervals of 90 degrees, and the pitch circle diameter is dimension D1. This pitch circle diameter dimension D1 is the same as the pitch circle diameter of the four bolt holes 22B provided in the spindle 22 of the large center joint 21.

  Further, four legs 15 extending in the left and right directions are provided at the four corners of the center frame 13, and a side frame 14 is attached to each leg 15 so as to be movable in the left and right directions. A hydraulic cylinder 16 is provided between the center frame 13 and the side frame 14 to move the side frame 14 left and right along the legs 15 to expand and contract the vehicle width. .

  Reference numeral 17 denotes a traveling hydraulic motor provided at one end of the left and right side frames 14. The traveling hydraulic motor 17 is provided with drive wheels 18. Reference numeral 19 denotes a driven wheel provided at the other end of the left and right side frames 14, and 20 denotes a crawler belt (shown only on the left side) wound around the drive wheel 18 and the driven wheel 19. . The traveling hydraulic motor 17, the drive wheel 18, the driven wheel 19, and the crawler belt 20 constitute a crawler device.

  Next, a plurality of types of center joints can be attached to the center frame 13 of the lower traveling body 11. In the first embodiment, two types of large center joints 21 and small center joints 31 described later are used. A case of selective mounting will be described as a representative example. In this case, the large center joint 21 can be directly attached to the center joint insertion hole 13 </ b> C of the center frame 13, and the small center joint 31 is formed smaller in size than the large center joint 21.

  Therefore, the configuration of the large center joint 21 and the small center joint 31 and the configuration of the relay plate 36 used when the small center joint 31 is attached to the center joint insertion hole 13C will be described.

  First, the case where the large center joint 21 is attached to the lower traveling body 11 will be described. Reference numeral 21 denotes a large center joint attached to the center of the center frame 13 of the track frame 12 constituting the lower traveling body 11 (FIG. 4, see FIG. The large center joint 21 is formed larger than a small center joint 31 described later. The large center joint 21 allows the upper swing body 3 to swing with respect to the lower travel body 11, for example, the hydraulic pump 10 of the upper swing body 3, the hydraulic cylinder 16 of the lower travel body 11, the travel hydraulic pressure. The hydraulic oil is circulated between the motor 17 and the like.

  As shown in FIGS. 8 and 9, the large-sized center joint 21 includes an inner spindle 22 that is positioned on the lower side and is attached to the center joint insertion hole 13 </ b> C of the center frame 13 on the lower traveling body 11 side, and the spindle 22. And an outer body 23 that is fixed to the upper swing body 3 so as not to rotate. The body 23 is formed as a covered cylindrical body that is rotatable with respect to the spindle 22, and a plurality of hydraulic oil passages through which hydraulic oil can flow between the spindle 22 and the body 23 regardless of the rotational position. (Not shown) is formed.

  On the other hand, as shown in FIG. 9, the spindle 22 is provided with a flange-like flange 22A, and a plurality of bolt holes 22B are formed through the flange 22A. Here, four bolt holes 22B are provided, for example, at intervals of 90 degrees, and the pitch circle diameter has the same dimension D1 as each bolt hole 13D of the center frame 13 constituting the lower traveling body 11. Thus, by aligning the bolt holes 22B of the flange 22A with the bolt holes 13D of the center frame 13, the large center joint 21 can be attached around the center joint insertion hole 13C using the bolts 24.

  The large center joint 21 is connected at its spindle 22 (hydraulic oil passage) to a hydraulic cylinder 16 that serves as an actuator of the lower traveling body 11 and a traveling hydraulic motor 17 through a plurality of hydraulic hoses 25. The body 23 (hydraulic oil passage) is connected to the hydraulic pump 10 and the hydraulic oil tank via a plurality of hydraulic hoses 26 and control valves (not shown).

  Next, a case where a small center joint 31 smaller than the large center joint 21 is attached to the lower traveling body 11 will be described with reference to FIGS.

  In FIG. 10, reference numeral 31 denotes a small center joint attached to the center of the center frame 13. The small center joint 31 has a smaller shape than the large center joint 21 described above. Therefore, since the small center joint 31 cannot be directly attached to the center joint insertion hole 13C of the center frame 13, as shown in FIGS. 10 and 11, the small center joint 31 is attached using a separately prepared relay plate 36 described later. Yes.

  The small center joint 31 differs in specifications such as the overall size and the number of hydraulic hoses 34 and 35 to be connected, which will be described later. It is the same.

  That is, as shown in FIG. 12, the small center joint 31 is rotatably attached to an inner spindle 32 positioned on the lower side and an upper portion of the spindle 32, and is fixed to the upper swing body 3 side so as not to rotate. The outer body 33 and a plurality of hydraulic oil passages (not shown) provided across the spindle 32 and the body 33 are roughly configured. The small center joint 31 has a spindle 32 connected to the traveling hydraulic motor 17 of the lower traveling body 11 and the like via a hydraulic hose 34. The body 33 is connected to the hydraulic pump 10 and the like via a hydraulic hose 35 and a control valve (not shown).

  Further, as shown in FIGS. 11 and 12, the spindle 32 is provided with a flange-shaped flange 32A. The flange 32A has a substantially rectangular shape as shown in FIG. 13, and a plurality of bolts are provided at the four corners. The hole 32B is formed through. Here, for example, four bolt holes 32B are provided at intervals of 90 degrees, and the pitch circle diameter is smaller than the pitch circle diameter D1 of each bolt hole 13D of the center frame 13 described above.

  Accordingly, since each bolt hole 32B of the spindle 32 is not compatible with each bolt hole 13D of the center frame 13, the small center joint 31 is not attached to the center joint insertion hole 13C of the center frame 13 using each bolt hole 13D. Can not.

  Therefore, in the first embodiment, a relay plate 36 (to be described later) is interposed between the center frame 13 and the small center joint 31, so that the center joint insertion hole 13 </ b> C of the center frame 13 of the lower traveling body 11 is interposed. The small center joint 31 is attached.

  Reference numeral 36 denotes a relay plate according to the first embodiment used when the small center joint 31 is attached to the center joint insertion hole 13 </ b> C of the center frame 13. As shown in FIGS. 10 and 11, the relay plate 36 is attached to the center joint insertion hole 13 </ b> C (position of the turning center O) of the center frame 13 constituting the lower traveling body 11 instead of the large center joint 21. is there. A small center joint 31 can be attached to the relay plate 36. As a result, the relay plate 36 constitutes an attachment for indirectly attaching the small center joint 31 to the center frame 13. The relay plate 36 is formed of a circular annular plate and is formed as a strength member having a sufficient thickness as shown in FIG.

The relay plate 36 has a center joint insertion hole 36A as a small center joint insertion hole to which the spindle 32 of the small center joint 31 is inserted and attached. Further, as shown in FIG. 14, a plurality of outer bolt holes 36B corresponding to the respective bolt holes 13D of the center frame 13 are provided on the outer peripheral side of the relay plate 36, and the inner peripheral side of each outer bolt hole 36B. Are provided with a plurality of inner bolt holes 36 </ b> C corresponding to the respective bolt holes 32 </ b> B of the spindle 32 constituting the small center joint 31.

  Here, for example, four outer bolt holes 36B of the relay plate 36 are provided at intervals of 90 degrees, and the pitch circle diameter thereof is the same dimension D1 as each bolt hole 13D of the center frame 13 constituting the lower traveling body 11. ing. Thereby, by connecting each bolt hole 36 </ b> B to each bolt hole 13 </ b> D of the center frame 13, the relay plate 36 can be attached to the lower traveling body 11 side using the bolt 24.

  Further, four inner bolt holes 36C of the relay plate 36 are provided, for example, at intervals of 90 degrees, and the pitch circle diameter is smaller than the pitch circle diameter D1 of each outer bolt hole 36B, and is formed in the spindle 32 of the small center joint 31. The dimension D2 is the same as the pitch circle diameter of each bolt hole 32B provided. Thus, the small center joint 31 can be attached to the relay plate 36 using the bolts 37 by aligning the bolt holes 32B of the spindle 32 with the inner bolt holes 36C.

  Furthermore, each outer bolt hole 36B and each inner bolt hole 36C are shifted in the circumferential direction with respect to the relay plate 36, for example, so that the inner bolt hole 36C is positioned substantially in the middle of the adjacent outer bolt holes 36B. The relay plate 36 is arranged at a position shifted by about 45 degrees. Thereby, since each outer bolt hole 36B and each inner bolt hole 36C can be arranged apart from each other, a space for handling a tool such as a spanner can be secured when the bolts 24 and 37 are attached and detached. Further, the pitch circle diameter D2 of each inner bolt hole 36C can be set to a large dimension close to the pitch circle diameter D1 of each outer bolt hole 36B.

  The hydraulic crane 1 according to the first embodiment has the above-described configuration. Next, in order to selectively attach the large center joint 21 and the small center joint 31 to the center frame 13 of the lower traveling body 11. Will be described.

  First, the case where the large center joint 21 is attached to the center joint insertion hole 13C of the center frame 13 will be described. In this case, the bolt holes 22B of the spindle 22 of the large center joint 21 are aligned with the bolt holes 13D of the center frame 13 constituting the track frame 12 of the lower traveling body 11, and the bolts 24 of the center frame 13 are aligned. Screw into each bolt hole 13D. Thereby, the large center joint 21 can be directly attached to the center joint insertion hole 13 </ b> C of the center frame 13 of the lower traveling body 11.

  Next, the case where the small center joint 31 is attached to the center joint insertion hole 13C of the center frame 13 will be described. In this case, the outer bolt holes 36B of the relay plate 36 are aligned with the bolt holes 13D of the center frame 13 of the lower traveling body 11, and the bolts 24 are used to relay to the center joint insertion holes 13C of the center frame 13. Install the plate 36. Further, each bolt hole 32B of the spindle 32 constituting the small center joint 31 is aligned with each inner bolt hole 36C of the relay plate 36, and the small center joint 31 is attached to the relay plate 36 using the bolt 37. Thereby, the small center joint 31 can be indirectly attached to the center frame 13 of the lower traveling body 11 with the relay plate 36 interposed. The relay plate 36 may be attached to the center frame 13 of the lower traveling body 11 after the small center joint 31 is attached to the relay plate 36.

  Next, operation | movement of the hydraulic crane 1 comprised as mentioned above is demonstrated. The operator gets on the cab 6 of the upper swing body 3, starts the engine 9, and drives the hydraulic pump 10. Thereby, the pressure oil from the hydraulic pump 10 is supplied to various actuators via the control valve. When an operator boarding the cab 6 operates a travel operation lever (not shown), pressure is applied from the control valve to the travel hydraulic motor 17 via the hydraulic oil passage of the large center joint 21 or the small center joint 31. Oil can be supplied, and the crawler belt 20 can be driven by the drive wheels 18 to move the lower traveling body 11 forward or backward. On the other hand, by operating an operation lever (not shown) for work, the work device 4 can transport materials from the ground to a high place.

  Thus, according to the first embodiment, the relay plate 36 used when the small center joint 31 is attached to the center joint insertion hole 13C of the center frame 13 forming the lower traveling body 11 is provided. When the center joint 31 is attached, the relay plate 36 is interposed between the center joint insertion hole 13 </ b> C and the small center joint 31.

  Accordingly, when the large center joint 21 is attached to the center frame 13 of the lower traveling body 11, the large center joint 21 can be directly attached to the center joint insertion hole 13 </ b> C of the center frame 13. On the other hand, when the small center joint 31 is attached to the lower traveling body 11, a relay plate 36 is interposed between the center frame 13 of the lower traveling body 11 and the flange 32A of the spindle 32 of the small center joint 31. The small center joint 31 can be indirectly attached to the center joint insertion hole 13 </ b> C of the center frame 13 through the relay plate 36.

  As a result, both the large center joint 21 and the small center joint 31 can be selectively attached to one lower traveling body 11, and the lower traveling body 11 can be shared by a plurality of types of hydraulic cranes 1. it can. Thereby, the productivity of the hydraulic crane 1 can be improved and the manufacturing cost can be reduced.

  Further, when other relay plates having different pitch circle diameter dimensions of the inner bolt holes are prepared, a plurality of types of center joints other than the large center joint 21 and the small center joint 31 are indirectly connected to the lower traveling body 11 side. It can be installed and the range of commonality can be expanded.

  Further, the outer bolt holes 36B and the inner bolt holes 36C provided in the relay plate 36 are arranged with a position shifted by, for example, about 45 degrees in the circumferential direction. Thereby, since each outer bolt hole 36B and each inner bolt hole 36C can be arranged apart from each other, a space for handling a tool such as a spanner can be secured when the bolts 24 and 37 are attached and detached. Can increase the sex.

  In addition, since the inner bolt hole 36C can be disposed substantially in the middle of the adjacent outer bolt holes 36B, the pitch circle diameter D2 of each inner bolt hole 36C is set to a large dimension close to the pitch circle diameter D1 of each outer bolt hole 36B. be able to. Thereby, the kind of center joint which can be attached to the relay plate 36 can be increased.

Next, FIGS. 16 and 17 show a reference example of the present invention. The feature of this reference example is that the center joint is attached to the upper swing body. In the reference example , the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

In FIG. 16, reference numeral 41 denotes a lower traveling body according to a reference example , and the lower traveling body 41 is configured by a center frame 43 of a track frame 42 and the like, almost the same as the lower traveling body 11 according to the first embodiment. . A center joint insertion hole 43 </ b> B for passing a large center joint 46 or a small center joint 49 described later is formed in the upper surface plate 43 </ b> A of the center frame 43.

Reference numeral 44 denotes an upper swing body according to a reference example , and the upper swing body 44 includes a swing frame 45 and the like. In addition, a disc-shaped mounting plate 45B is integrally fixed to the pivot center of the bottom plate 45A of the pivot frame 45, and a body 48 of a large center joint 46 or a small center joint described later is disposed at the center of the mounting plate 45B. A center joint insertion hole 45C through which 49 bodies 51 are inserted is attached.

Reference numeral 46 denotes a large-sized center joint according to a reference example attached to the center joint insertion hole 45C of the turning frame 45 forming the upper turning body 44. The large center joint 46 includes a spindle 47 and a body 48 that can rotate relative to each other, and a flange 48 </ b> A is formed in the lower portion of the body 48. The large center joint 46 is directly bolted to the mounting plate 45B of the turning frame 45 of the upper turning body 44 at the flange 48A of the body 48 thereof.

In FIG. 17, reference numeral 49 denotes a small center joint according to a reference example attached to the upper swing body 44 instead of the large center joint 46. The small center joint 49 includes a spindle 50 and a body 51 that can rotate relative to each other, and a flange 51 </ b> A is formed at a lower portion of the body 51. Further, the flange 51A of the body 51 of the small center joint 49 is indirectly bolted to the mounting plate 45B of the turning frame 45 of the upper turning body 44 via a relay plate 52 described later.

Reference numeral 52 denotes a relay plate according to a reference example provided between the turning frame 45 and the small center joint 49. The relay plate 52 is configured as an attachment that indirectly attaches the body 51 of the small center joint 49 to the swing frame 45 of the upper swing body 44 in substantially the same manner as the relay plate 36 according to the first embodiment described above. .

Thus, also in the reference example configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment described above. In particular, in the reference example , the turning frame 45 constituting the upper turning body 44 can be used in common.

In the first embodiment, the small center joint 31 smaller than the large center joint 21 is attached by attaching one relay plate 36 to the center joint insertion hole 13 C of the center frame 13. However, the present invention is not limited to this. For example, as shown in a modification shown in FIG. 18, by attaching another relay plate 61 to the relay plate 36, another center joint having a smaller shape than the small center joint 31 is provided. It is good also as a structure which attaches 62. This configuration can be similarly applied to the reference example .

  Further, in the first embodiment, the case where four bolt holes 13D of the center frame 13 are provided at intervals of 90 degrees is illustrated, and the other bolt holes 22B, 32B, 36B, 36C are provided similarly. Is illustrated. However, the present invention is not limited to this, and a configuration in which three or five or more bolt holes are provided may be used, and a configuration in which the number of bolt holes is properly used depending on each part may be employed.

  Furthermore, in each embodiment, the hydraulic crane 1 provided with the crawler type lower traveling body 11 was described as an example of the construction machine. However, the present invention is not limited to this, and can be widely applied to other construction machines having a swivel structure such as a hydraulic excavator.

1 is a front view showing a hydraulic crane according to a first embodiment of the present invention. It is a top view which expands and shows the hydraulic crane of FIG. It is a top view which expands and shows a lower traveling body. It is sectional drawing of the principal part expansion which looked at the attachment state of the large-sized center joint with respect to a lower traveling body from the arrow IV-IV direction in FIG. It is a top view which expands and shows the center site | part of a center frame. It is an assembly perspective view shown in the state where the principal part of a center frame and a large-sized center joint are assembled. It is a disassembled perspective view shown in the state which decomposed | disassembled the principal part of the center frame, and the large sized center joint. It is a front view which shows a large sized center joint independently. It is a top view which shows a large sized center joint independently. It is an assembly perspective view which shows the state which assembled the principal part of the center frame, the small center joint, and the relay plate. It is a disassembled perspective view in the state which decomposed | disassembled the principal part of the center frame, the small center joint, and the relay plate. It is a front view which shows a small center joint independently. It is the cross-sectional view which looked at the spindle of a small center joint from the arrow XIII-XIII direction in FIG. It is a top view which shows a relay plate alone. It is a front view which shows a relay plate alone. It is sectional drawing of the principal part expansion which looked at the lower traveling body by the reference example of this invention, the turning frame, and the large sized center joint from the same position as FIG. It is sectional drawing of the principal part expansion which looked at the lower traveling body by the reference example of this invention, the turning frame, the small center joint, and the relay plate from the same position as FIG. It is a disassembled perspective view which shows the other center joint, other relay plate, etc. by the modification of this invention.

Explanation of symbols

1 Hydraulic crane (construction machine)
2 slewing device 3,44 upper slewing body 5,45 slewing frame 5A, 45A bottom plate 5B, 13C, 36A, 45C center joint insertion hole 9 engine (motor)
10 Hydraulic pump (hydraulic power source)
11, 41 Lower traveling body 12, 42 Track frame 13, 43 Center frame 13A, 43A Top plate 13B, 45B Mounting plate 13D, 22B, 32B Bolt hole 16 Hydraulic cylinder (actuator)
17 Traveling hydraulic motor (actuator)
18 Driving wheel 21, 46 Large center joint 22, 32, 47, 50 Spindle 22A, 32A, 48A, 51A Flange 23, 33, 48, 51 Body 24, 37 Bolt 31, 49 Small center joint 36, 52 Relay plate 36B Outside Bolt hole 36C Inner bolt hole 61 Other relay plate 62 Other center joint O Turning center D1, D2 Pitch circle diameter

Claims (3)

A lower traveling body capable of self-running by a traveling hydraulic motor, and an upper swing body provided with a prime mover that is mounted on the lower traveling body through a swing device so as to be capable of swinging and that drives a hydraulic power source,
A center joint insertion hole is provided at a turning center of the lower traveling body, and the hydraulic power source and the traveling are allowed in the center joint insertion hole while allowing the lower traveling body and the upper turning body to relatively rotate. The center joint that circulates hydraulic oil between the actuator and the actuator including the hydraulic motor is installed .
The center joint includes an inner spindle, an outer body that is provided so as to surround the spindle and is rotatable with respect to the spindle, and a hydraulic oil passage that circulates the hydraulic oil between the spindle and the body. In the construction machine that has
The center joint has a plurality of types including a large center joint capable of directly attaching the spindle to the center joint insertion hole on the lower traveling body side, and a small center joint whose shape is smaller than that of the large center joint. And
Comprising a relay plate used when attaching the spindle of the small center joint to the center joint insertion hole on the lower traveling body side ;
The relay plate is made of an annular plate, and has a small center joint insertion hole through which the spindle of the small center joint is inserted,
A construction machine characterized in that, when the spindle of the small center joint is attached to the center joint insertion hole on the lower traveling body side, the relay plate is interposed between the spindle and the center joint insertion hole. . Around the center joint insertion hole, a plurality of bolt holes for mounting the large center joint are provided with a large pitch circle diameter,
The relay plate is provided with a plurality of outer bolt holes having a large pitch circle diameter corresponding to the bolt holes around the center joint insertion hole, and the small center is located on the inner peripheral side of the outer bolt holes. The construction machine according to claim 1, wherein a plurality of inner bolt holes for attaching the joint are provided with a small pitch circle diameter.   The construction machine according to claim 2, wherein the outer bolt holes and the inner bolt holes are arranged so as to be shifted in the circumferential direction with respect to the relay plate.

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