JP2012153306A - Expanding and contracting device of lower traveling body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an expanding and contracting device of a lower traveling body which increases the expanding and contracting range of the lower traveling body and which enables the strength thereof to be easily secured.SOLUTION: Double guide parts of an inner guide part 18 and an outer guide part 17 are disposed before and after a center frame 9 of the lower traveling body toward right and left direction. Respective cylindrical frames 21 are disposed on right and left side frames 10 of the lower traveling body so as to be projected to the inner side of right and left side frames 10 of the lower traveling body from intermediate parts in the right and left direction or the outer ends of the side frames 10. Each cylindrical frame 21 is fit between the inner guide part 18 and the outer guide part 17 so as to be slidable. The expanding and contracting device of the lower traveling body has such a structure that the right and left outer ends of the inner guide part 18 are projected to the outer sides than the right and left outer ends of the outer guide part 17.

Description

  The present invention relates to a horizontal excavator, a crane or a working machine such as an applied machine in which an upper swing body is installed on a lower travel body and a working device is attached to the upper swing body. It is related with the apparatus which expands / contracts.

  In a working machine in which an upper swinging body is installed on the lower traveling body and various working devices are attached to the upper swinging body, between the left and right crawler belts constituting the lower traveling body in order to stabilize the working machine during work. Some have adopted a configuration in which the width is widened to provide a stable posture and the width required for transportation is reduced by reducing the width during transportation.

  A conventional lower traveling body expansion / contraction device in such a working machine is provided with guide cylinders facing left and right, respectively, on the front and rear of a center frame where the upper swing body is installed on the upper surface, as shown in Patent Document 1, for example. The left and right side frames to which the crawler belts are attached are provided with cylindrical frames protruding inward on the front and rear sides thereof, and these cylindrical frames are slidably fitted into the guide cylinders of the center frame. The

  As another example of a conventional undercarriage expanding / contracting apparatus, there is one disclosed in Patent Document 2, for example. The guide cylinders are provided to the left and right of the lower traveling body on the left and right side frames, and the left and right cylindrical frames are provided on the front and rear of the center frame, respectively. It has a configuration in which it is slidably fitted in the provided guide cylinder.

  Moreover, in order to expand the expansion / contraction range of the lower traveling body, for example, as disclosed in Patent Document 3, one set of guide cylinders each having two sets adjacent to the front and rear are set on the front and rear of the center frame. On the other hand, on the front and rear of the left and right side frames, each cylindrical frame provided to project inward is slidably fitted to different guide frames in the front group and rear group of the center frame. There is. If constituted in this way, the cylindrical frames provided on the left and right side frames are not faced but arranged in an intersecting manner, so that the expansion / contraction range between the left and right crawler belts can be expanded. Become.

JP 2003-182653 A Japanese Patent Laid-Open No. 2004-243852 JP 2000-326875 A

  In the expanding / contracting device for the lower traveling body described in Patent Document 1, the left and right cylindrical frames are on the same axis and face each other, and therefore the inner ends of the left and right cylindrical frames are abutted in the expansion / contraction range of the left and right side frames. From the reduced width state to the widened state leaving the desired fitting width between the cylindrical frame and the guide cylinder. For this reason, it is difficult to meet the demand for obtaining a wider expansion / contraction range.

  Further, as described in Patent Document 2, in the case where guide cylinders are provided on the left and right side frames, the expansion / contraction width is limited to a width smaller than the left and right widths of the guide cylinders provided on the side frames. As with the configuration described in No. 1, it is difficult to meet the demand for obtaining a wider expansion / contraction range.

  On the other hand, as described in Patent Document 3, in the configuration in which two guide cylinders are provided before and after the center frame, the cylindrical frames provided on the left and right side frames are not on the same axis but are arranged in an intersecting manner. Therefore, there is no limitation on the expansion / contraction range in the case of the configurations described in Patent Documents 1 and 2, and a wider expansion / contraction range can be obtained. However, since the front-rear width of each guide cylinder is reduced to about one-half that of Patent Document 1 due to the limitation of the front-rear width of the center frame, the front-rear width of the cylindrical frame provided on the side frame is also about Since it becomes a half, it becomes difficult to obtain the required strength.

  In view of the above problems, an object of the present invention is to provide a lower traveling body expanding / contracting device having a configuration in which the widening range of the lower traveling body is expanded and the strength can be easily secured.

The expansion / contraction device for the lower traveling body according to claim 1 is:
In a lower traveling body expansion / contraction device comprising a center frame that installs an upper turning body of a work implement, and a side frame that is attached to the left and right of the center frame and that is equipped with a traveling motor,
A cylindrical frame that is attached to the left and right side frames of the lower traveling body and protrudes from the middle part or outer end of the side frame to the inside of the side frame, respectively.
An outer side guide portion that is provided on the front and rear sides of the center frame toward the left and right sides, and has a cylindrical shape that fits the cylindrical frames of the left and right side frames respectively;
An inner guide portion provided inside the outer guide portion and coupled to the outer guide portion, the left and right outer ends projecting outward from the left and right outer ends of the outer guide portion;
The cylindrical frame is inserted between the outer guide portion and the inner guide portion and is slidably connected.

The expansion / contraction device for the lower traveling body according to claim 2 is the expansion / contraction device for the lower traveling body according to claim 1,
The inner guide part is configured to be separable from the outer guide part,
The outer guide portion is constituted by an upper member having a turning device mounting portion for installing the upper turning body, and a lower member detachably coupled to the upper member by a bolt.

  The invention of claim 1 is provided on the front and rear of the center frame of the lower traveling body, provided on the front and rear sides of the inner and outer guide portions and the left and right side frames, respectively, The inner guide portion has a double fitting structure having a cylindrical frame that is fitted outside and the outer guide portion is fitted inside.

  In the double fitting structure, in the structure in which the cylindrical frame of the side frame is fitted into the outer guide portion of the center frame, the relative position of the outer end of the outer guide portion with respect to the cylindrical frame in the reduced width state is It is restricted by the position of the inner end of the side frame, that is, the side frame is close to the outer end of the outer guide portion. On the other hand, since the inner guide portion is fitted into the cylindrical frame, the position of the outer end of the inner guide portion in the reduced width state is not limited by the position of the inner end of the side frame. For this reason, the structure of this invention which made the outer end of an inner side guide part protrude outside rather than the outer end of an outer side guide part is realizable.

  Thus, in the present invention, since the outer end of the inner guide portion protrudes outward from the outer end of the outer guide portion, in the widest state, the fitting portion between the cylindrical frame and the inner guide portion Since the left and right widths can be sufficiently secured, it is possible to obtain a wider expansion / contraction range for supporting the upper swing body and the work device, and to support the upper swing body and the work device in a more stable state. it can.

  Further, the cylindrical frames attached to the left and right side frames have a structure attached on the same axis, and the size of the cross section of the cylindrical frame can be ensured in the same manner as that described in Patent Document 1. In addition, since the tubular frame of the left and right side frames is combined between the inner guide portion and the outer guide portion of the center frame in a double fitting structure, the strength of these expansion / contraction portions is large. Become.

  When implementing this invention, it can implement | achieve as a structure where the inner side guide part and the outer side guide part were combined so that separation was impossible. However, when this structure is adopted, when the side frame is combined with the center frame, it is necessary to insert the cylindrical frames of the left and right side frames between the inner guide portion and the outer guide portion. This insertion work is generally performed in a state where the upper swing body has already been installed on the center frame, that is, in a work state where the upper swing body is interfered, and therefore the side frame is combined with the center frame. It becomes difficult.

  On the other hand, the invention of claim 2 is a structure in which the inner guide portion is detachably combined with the center frame, and the upper member and the lower member constituting the outer guide portion are detachably combined. For this reason, when combining the center frame and the side frame, the inner guide portion is separated from the center frame, and the left and right side frame cylindrical frames are externally fitted to the left and right of the inner guide portion. Can do. And from this state, the upper member of the center frame on which the upper swing body is installed is placed on the cylindrical frame, the lower member is applied from below the cylindrical frame, and the inner guide portion is fixed to the lower member or the upper member, The center frame and the side frame can be combined by connecting the lower member to the upper member with a bolt.

  In this way, if the inner guide part is separable from the center frame and the outer guide part is also composed of an upper member that is the main body of the center frame and a lower member that is separably bolted to the upper member, The cylindrical frame of the side frame can be easily combined with the inner guide portion without interference of the upper swing body.

  Also, from this state, a combination of the side frame and the center frame can be obtained by hanging the upper member of the center frame on which the upper swing body is installed by a crane and placing it on the cylindrical frame, and bolting the lower member to the upper member. It can be done easily.

  If the expansion / contraction hydraulic cylinder is mounted between the left and right side frames, the expansion / contraction hydraulic cylinder can be attached without attaching the center frame on which the upper swing body is installed to the side frame. Therefore, the mounting operation of the expansion / contraction hydraulic cylinder can be easily performed.

It is a side view which shows an example of the working machine which applies the expansion / contraction apparatus of the lower traveling body of this invention. It is a top view of the lower traveling body which shows one Embodiment of the expansion / contraction apparatus of the lower traveling body of this invention. It is EE sectional drawing of FIG. It is a bottom view of the lower traveling body of this embodiment. (A) is the side view which looked at one side frame of this embodiment from the inside, (B) is the top view, (C) is the enlarged front view of (A), (D) is G of (A) It is -G sectional drawing. (A) is a top view which shows the upper member of the center frame of this embodiment, (B) is the side view. (A) The top view which shows the lower member of the center frame of this embodiment, (B), (C) is the H arrow directional view and (I) arrow directional view of (A), respectively. (A) is the front view which shows the inner side guide part of this embodiment, (B) is the bottom view, (C) is the enlarged end view. It is sectional drawing which cut | disconnected the fitting part of the inner / outer guide part and cylindrical frame of the lower traveling body of this embodiment in the transversal direction. It is front sectional drawing which shows the lower traveling body of this embodiment in a reduced width state. It is front sectional drawing which shows the lower traveling body of this embodiment in a widened state. In this embodiment, it is a top view which shows the state which fitted the cylindrical frame of the side frame to the inner side guide part. It is a fragmentary front sectional view which shows the connection structure of the inner side guide part of this embodiment, a cylindrical frame, and an outer side guide part.

  FIG. 1 is a side view showing an example of a working machine to which a lower traveling body expansion / contraction device of the present invention is applied. The working machine in this example constitutes a pile driver, and a turning frame 3a is installed on the lower traveling body 1 via a turning device 2, and a hydraulic power unit 4, a cab 5 and the like are mounted on the turning frame 3a. The upper swing body 3 is configured. The hydraulic power unit 4 mounted on the turning frame 3a includes an engine-driven hydraulic pump that serves as a hydraulic source such as a hydraulic motor (not shown) that operates the drive wheels 6 of the lower traveling body 1. A leader 7 is erected on the front portion of the revolving frame 3a, and a drive device 8 having a chuck device 8a for attaching a screw auger, a pile, a steel pipe or the like is attached so as to be movable up and down along the leader 7.

  The lower traveling body 1 has side frames 10 attached to the left and right sides of a center frame 9 (see FIG. 2), which will be described later, and the driving wheels 6 are attached to the rear portions of the left and right side frames 10, respectively. The crawler belt 12 is wrapped around these.

  2 is a plan view of a lower traveling body showing an embodiment of an expansion / contraction device for the lower traveling body of the present invention, FIG. 3 is a cross-sectional view taken along line EE of FIG. 2, and FIG. 4 is a bottom view of the lower traveling body. . As shown in these drawings, the left and right side frames 10 have an attachment portion 10 a for the driving wheel 6 and an attachment portion 10 b for the driven wheel 11.

  In FIG. 2, 9 is a center frame of the lower traveling body 1, and the center frame 1 has an upper member 14 having an annular mounting portion 14a of the turning device 2 and an upper member 14 as shown in FIGS. The lower member 16 is detachably coupled by a bolt 15. Between the upper member 14 and the lower member 16, an outer guide portion 17 is formed that is positioned before and after the center frame 9.

  Reference numeral 18 denotes an inner guide portion that is detachably coupled to the lower member 16 by the fixing member 19 to the lower member 16. Reference numeral 21 denotes a cylindrical frame that protrudes inwardly before and after the left and right side frames 10. The cylindrical frame 21 is slidably fitted to the inner guide portion 18 and slidably fitted to the outer guide portion 17. An expansion / contraction hydraulic cylinder 22 is attached between the left and right side frames 10 and 10.

  Next, the detail of each part is demonstrated. FIG. 5A is a side view of one side frame of this embodiment as viewed from the inside, FIG. 5B is a plan view thereof, FIG. 5C is an enlarged front view of this side frame, and FIG. It is GG sectional drawing of. As shown in FIGS. 5A to 5C, upper and lower mounting seats 10 c and 10 d for reinforcing the mounting portion of the cylindrical frame 21 are provided inside the side frame 10 from the main frame 10 e of the side frame 10. Is also protruded inward and welded. These cylindrical frames 21 are attached by welding their outer ends to the mounting seats 10c, 10d and the main frame 10e. Each part of the mounting seat 10c and the main frame 10e also serves as a top plate and an end plate near the end of the cylindrical frame 21.

  5A to 5C, 21b is a long hole provided in the bottom plate portion 21a of the cylindrical frame 21 in the longitudinal direction, and a stopper pin 38 (see FIGS. 4, 7 to 11 and 13 described later). ) To restrict the movement range of the side frame 10 relative to the inner guide portion 18. 21d is a sliding plate attached to the outer surface of the cylindrical frame 21, and will be described later on a sliding plate 28 (see FIG. 6) provided on the upper member 14 and a later-described sliding plate 35 provided on the lower member 16 (FIG. 7). Reference) and slide. In FIG. 5D, reference numeral 23 denotes a bracket for connecting the expansion / contraction hydraulic cylinder 22 with a pin 52 (see FIG. 12).

  6A and 6B are a plan view and a side view of the upper member 14 constituting the center frame 9, respectively. The upper member 14 of this embodiment has an annular mounting portion 14 a for mounting the swivel device 2 on the flat plate portion 25 reinforced by the ribs 24. Reference numeral 26 denotes a screw hole provided in the attachment portion 14a for attaching the swivel device 2. Two sets, ie, four vertical plates 27, are welded to the lower surfaces of the flat plate portion 25 before and after. These vertical plates 27 constitute a cylindrical outer guide portion 17 (see FIGS. 2 and 9 to 11) in combination with the lower member 16, and a lower member is provided at the lower end of each vertical plate 27. A screw hole 27 a for connecting 16 to the bolt 15 is provided. Reference numeral 28 denotes a sliding plate, which is attached to the opposing surfaces of the vertical plates 27 and the lower surface of the flat plate portion 25 and makes contact with the side surface and upper surface of the cylindrical frame 21 to facilitate the movement of the cylindrical frame 21. Is.

  29 is a reinforcing plate welded to the vertical plate 27 and the flat plate portion 26 between the second and third vertical plates 27 when viewed in the front-rear direction, and 30 is a piston rod of the expansion / contraction hydraulic cylinder 22. , A cover 31 is an opening provided in a portion of the flat plate portion 25 located in the attachment portion 14a. The opening 31 is a hydraulic motor (not shown) attached to the drive wheel attachment portion 10a of the side frame 10. ) And the like are passed through a hydraulic hose (not shown).

  FIG. 7A is a plan view of the lower member 16, FIG. 7B is a view taken in the direction of arrow H in FIG. 7A, and FIG. 7C is a view taken in the direction of arrow I in FIG. In these drawings, reference numeral 33 denotes a flat plate portion constituting the main part of the lower member 16. Reference numeral 34 denotes a bolt insertion hole through which the bolt 15 for connecting the lower member 16 to the upper member 14 is passed. Reference numeral 35 denotes a sliding plate that is attached to the upper surface of the flat plate portion 33 and smoothens the movement of the cylindrical frame 21.

  Reference numeral 36 denotes a through hole through which the fixing tool 19 for attaching the inner guide portion 18 to the lower member 16 is passed. Reference numeral 37 denotes a stopper pin 38 (see FIGS. 9 to 11 and 13) for restricting the movement range of the cylindrical frame 21. It is a through-hole through. Reference numeral 39 denotes a mounting plate welded to the lower surface of the flat plate portion 33 for mounting the stopper pin 38.

  Reference numeral 41 denotes a plate member for lifting the lower member, which is welded to the left and right sides of the upper surface of the flat plate portion 33, and a hanging tool (not shown) is hung on the plate member 41 when the lower member 16 is lifted. It has a hole 41a. Reference numeral 43 denotes a rib welded to the lower surface of the flat plate portion 33. A bracket 44 is attached to the piston rod side of the expansion / contraction hydraulic cylinder 22 on the upper surface of the flat plate portion 33 and attaches a cover (not shown) that covers the lower side of the piston rod. Reference numeral 45 denotes an opening provided in the flat plate portion 33. The opening 45 is provided corresponding to the opening 31 of the upper member 14 and allows the hydraulic hose or the like to pass therethrough.

  8A is a front view showing the inner guide portion 18 of this embodiment, FIG. 8B is a bottom view thereof, and FIG. 8C is an enlarged end view thereof. The inner guide portion 18 includes both side plate portions 47, 47, a top plate portion 48, and a bottom plate portion 49, and the vertical cross-sectional shape forms a rectangular tube shape. However, the upper surface portions 48a at the left and right ends are formed in a shape that is inclined in accordance with the shape of the cylindrical frame 21 on the side frame 10 side. A through hole 49 a through which the fixing tool 19 is passed is provided at the center of the bottom plate portion 49 of the inner guide portion 18 in the longitudinal direction. Reference numeral 49b denotes a through hole provided in the bottom plate portion 49 for allowing the stopper pin 38 to pass therethrough. Reference numeral 50 denotes a sliding plate attached to each outer surface of the side plate portions 47, 47, the top plate portion 48, and the bottom plate portion 49, and smoothes the sliding of the cylindrical frame 21.

  As shown in the cross-sectional views of FIGS. 9, 10, and 11, the lower traveling body of this embodiment has a cylindrical shape of left and right side frames 10, 10 on the left and right sides of the inner guide portion 18 that constitutes the center frame 9. The frames 21 and 21 are slidably fitted outside, and the cylindrical frames 21 and 21 are slidably fitted on the outer guide portion 17.

  In order to combine the center frame 9 and the side frame 10 in this way, the left and right side frames 10 and 10 to which the crawler belt 12 is attached are separated from the center frame 9 using a crane as shown in FIG. The inner guide portion 18 is fitted on the left and right so as to be in a narrow state. In this case, since the lower member 16 of the center frame 9 to be performed later is attached to the upper member 14 with the bolts 15 from below, the side frame 10 to which the crawler belt 12 is attached is placed on a table (not shown) or jacked up. deep. Then, both ends of the expansion / contraction hydraulic cylinder 22 are attached to the brackets 23, 23 provided on the inner side of the side frames 10, 10 by pins 52, 52.

  Next, the upper member 14 of the center frame 9 to which the upper swing body 3 (see FIG. 1) is attached is placed on the cylindrical frame 21 so that the left and right cylindrical frames 21 are sandwiched between the two front and rear vertical plates 27 and 27. Put it on. Then, a screw provided at the lower end of the vertical plate 27 of the upper member 14 is pulled up by hanging a crane wire over the hole 41a (see FIGS. 7A and 7B) of the plate member 41 provided in the lower member 16 of the center frame 9. The bolt insertion hole 34 of the lower member 16 is aligned with the hole 27a, and the bolt 15 is passed through the bolt insertion hole 34 (see FIG. 7A) of the lower member 16 and screwed into the screw hole 27a to be fastened.

  When the lower member 16 is fixed to the upper member 14 in this manner, as shown in FIG. 13, the fixing is performed by inserting the head portion 19a up into the hole 49a of the bottom plate portion 49 of the inner guide portion 18 in advance. The tool 19 is passed through the through hole 36 of the lower member 16. Then, the cap 55 is applied to the lower end of the fixture 19 and the lower surface of the lower member 16, the bolt 56 is inserted into the bolt insertion hole 55 a of the cap 55, and is screwed into the screw hole 19 b of the fixture 19 to be fastened. The guide portion 18 is fixed to the lower member 16.

  Further, the stopper pin 38 is provided with a hole 39 a provided in the attachment plate 39 welded to the left and right of the lower surface of the lower member 16, a through hole 37 provided in the lower member 16, and a length provided in the bottom plate portion 21 a of the cylindrical frame 21. The hole 21b and the hole 49b provided in the bottom plate part 49 of the inner guide part 18 are inserted. In order to fix the stopper pin 38 to the lower member 16, the bolt 59 is inserted into the bolt insertion holes 58 a and 39 b of the plate member 58 welded to the stopper pin 38 and the mounting plate 57, and screw holes provided in the lower member 16. Screw onto 60 and fasten.

  When the center frame 9 and the side frame 10 are combined in this way, in the state where the expansion / contraction hydraulic cylinder 22 is most contracted (in the contracted width state), the stopper pin 38 is a cylindrical frame as shown in FIG. It will be in the state contact | abutted to the outer end part of 21 long hole 21b. On the other hand, in the state where the expansion / contraction hydraulic cylinder 22 is extended to the maximum (in the widened state), the stopper pin 38 is in contact with the inner end of the long hole 21b of the cylindrical frame 21 as shown in FIG. .

  As shown in FIG. 10, in the reduced width state, there is a restriction due to the positional relationship between the outer guide portion 17 and the side frame 10. That is, it is impossible to bring them closer to each other than the proximity of the left and right outer ends 17a of the outer guide portion 17 and the inner ends of the side frames 10, that is, the tips 10f and 10g of the mounting seats 10c and 10d.

  On the other hand, since the inner guide portion 18 is fitted in the cylindrical frame 21, the position of the outer end 18a of the inner guide portion 18 in the reduced width state is not limited by the positions of the inner ends 10f and 10g of the side frame 10. The two can be brought close to each other until the outer end 18a of the inner guide portion 18 comes into contact with the main frame 10e of the side frame 10 corresponding to the outer end of the cylindrical frame 21.

  For this reason, as shown in FIG. 8, the outer end 21c of the cylindrical frame 21 is located outside the inner ends 10f and 10g of the side frame 10, that is, in the middle of the side frame 10 in the left-right direction (a configuration reaching the outer end). In other words, the outer end 18a of the inner guide portion 18 can be realized by projecting ΔL outward from the outer end 17a of the outer guide portion 17.

  As a result, in the widened state shown in FIG. 11, the fitting width W1 between the inner guide portion 18 and the cylindrical frame 21 is wider than the fitting width W2 between the cylindrical frame 21 and the outer guide portion 17 by ΔW. Thus, in this embodiment, the fitting width between the cylindrical frame 21 and the center frame 9 can be increased. In addition, since the cylindrical frame 21 has a double fitting structure inserted between the outer guide portion 17 and the inner guide portion 18, it is intended to obtain the same support strength for the upper revolving unit 3 and the like as in the prior art. In this case, the distance between the left and right side frames 10, 10 can be increased. For this reason, the working device including the upper swing body 3, the reader 7, the driving device 8, and the like can be supported in a more stable state.

  In addition, the cylindrical frames 21 attached to the left and right side frames 10 have a structure attached on the same axis, and the size of the cross-section of the cylindrical frame 21 can be ensured similarly to that described in Patent Document 1. In addition, since the cylindrical frames 21 of the left and right side frames 10 are respectively inserted into the inner guide portion 18 and the outer guide portion 17 of the center frame 9 in a double fitting structure, these expansion and contraction are possible. The strength of the part increases.

  When practicing the present invention, it can be realized as a structure in which the outer guide portion 17 and the inner guide portion 18 are combined so as not to be separated. However, when such a structure in which the inner and outer guide portions are fixed so as not to be separated is employed, when the side frames 10 are combined with the center frame 9, the cylindrical frames 21 of the left and right side frames 10 are connected to the outer guide portions 17 and the inner guide portions. The operation | work inserted between 18 is needed. This insertion work is generally performed in a state in which the upper swing body 3 is already installed on the center frame 9, that is, in an operation state in which the upper swing body 3 is interfered with. Ten combination operations become difficult.

  On the other hand, according to the above-described embodiment, the inner guide portion 18 is detachably combined with the outer guide portion 17, and the outer guide portion 17 is detachably combined with the upper member 14 and the lower member 16. Therefore, when the center frame 9 and the side frame 10 are combined, the inner guide portion 18 is separated from the center frame 9 as shown in FIG. Thus, the cylindrical frames 21 of the left and right side frames 10 can be easily fitted to the inner guide portion 18.

  From the state of FIG. 12, the upper member 14 of the center frame 9 on which the upper swing body 3 is installed is suspended by a crane and placed on the cylindrical frame 21, and the lower member 16 is coupled to the upper member 14 with bolts 15. The combination of the side frame 10 and the center frame 9 can be easily performed.

  Further, if the expansion / contraction hydraulic cylinder 22 is mounted between the left and right side frames 10 and 10 as in the above embodiment, the expansion / contraction hydraulic cylinder 22 is attached to the center frame in which the upper swing body 3 is installed. 9 can be performed without being attached to the side frame 10, so that the expansion / contraction hydraulic cylinder 22 can be easily attached.

  In the above-described embodiment, an example in which one expansion / contraction hydraulic cylinder 22 is provided between the left and right side frames 10, 10 has been described, but a configuration in which an expansion / contraction hydraulic cylinder provided between the center frame 9 and the side frame 10 is provided. It is good. In addition, the expansion / contraction hydraulic cylinder 22 may be configured to be incorporated in the guide portion 18 or the cylindrical frame 21 or may be configured to be obliquely mounted between the center frame 9 and the side frame 10. Moreover, in the said embodiment, although the lower member 16 was comprised in flat form, parts other than the attaching part 14a of the upper member 14 are comprised in flat form, and the part corresponded to the vertical board 27 on the upper surface of the lower member 16 May be welded, and the upper member 14 may be coupled to the lower member 16 by a bolt 15 on the upper surface.

  In addition to the pile driving machine shown in the above embodiment, the present invention can be applied to a hydraulic excavator, a crane, or an application machine thereof used in various industries. Moreover, when implementing this invention, not only the said embodiment but a various change and addition are possible about the structure and combination of each part in the range which does not deviate from the summary of this invention.

1: lower traveling body, 2: turning device, 3: upper turning body, 3a: turning frame, 4: hydraulic power unit, 5: cab, 6: driving wheel, 7: leader, 8: driving device, 9: center frame, 10: side frame, 11: driven wheel, 12: crawler belt, 14: upper member, 14a: seat for mounting the turning device, 15: bolt, 16: lower member, 17: outer guide portion, 18: inner guide portion, 19: Fixing tool, 21: cylindrical frame, 21b: long hole, 22: hydraulic cylinder for expansion / contraction, 24: bracket, 25: flat plate part, 27: vertical plate, 27a: screw hole, 28: sliding plate, 33: flat plate part , 35: sliding plate, 38: stopper pin, 50: sliding plate

Claims (2)

In a lower traveling body expansion / contraction device comprising a center frame that installs an upper turning body of a work implement, and a side frame that is attached to the left and right of the center frame and that is equipped with a traveling motor,
A cylindrical frame that is attached to the left and right side frames of the lower traveling body and protrudes from the middle part or outer end of the side frame to the inside of the side frame, respectively.
An outer side guide portion that is provided on the front and rear sides of the center frame toward the left and right sides, and has a cylindrical shape that fits the cylindrical frames of the left and right side frames respectively;
An inner guide portion provided inside the outer guide portion and coupled to the outer guide portion, the left and right outer ends projecting outward from the left and right outer ends of the outer guide portion;
An expansion / contraction device for a lower traveling body, wherein the cylindrical frame is inserted between the outer guide portion and the inner guide portion and is slidably connected. In the expansion / contraction apparatus of the lower traveling body according to claim 1,
The inner guide part is configured to be separable from the outer guide part,
The lower traveling body characterized in that the outer guide portion is constituted by an upper member having a mounting portion for a turning device for installing the upper turning body, and a lower member detachably coupled to the upper member by a bolt. Expansion and contraction device.

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