JP5421167B2 - Cab support structure - Google Patents

Description

  The present invention relates to a cab support structure.

  Many construction machines such as hydraulic excavators have a turning frame mounted on the upper part of a self-propelled traveling body equipped with a crawler, and a work attachment and a cab on which an operator rides are attached to the turning frame.

  FIG. 15 shows an example of a conventional cab support structure. A swing frame 1 of a construction machine includes a frame upper member 2, a frame lower member 3, and a frame intermediate member 4 interposed between both members 2 and 3. It is comprised integrally with. The lower edge of the cab 5 attached to the revolving frame 1 is provided with a plurality of connecting members 6 projecting sideways, and holes 7 and 8 are formed through the frame upper member 2 and the connecting member 6 so as to pass coaxially up and down. ing.

  In a space 9 sandwiched between the frame upper member 2 and the frame lower member 3, an annular vibration isolating rubber 10 and a washer 11 are sequentially arranged from the top to the bottom, and the hole 7 of the frame upper member 2 and the vibration isolating rubber 10 are arranged. The long screw bolt 12 is inserted into the washer 11 from above, and nuts 13 and 14 are screwed onto the lower end of the long screw bolt 12 to prevent the vibration isolating rubber 10 and the washer 11 from falling off.

  After the washer 15, the annular anti-vibration rubber 16, and the washer 17 are sequentially fitted on the long screw bolt 12 from the upper end thereof, the connecting member 6 is connected to the washer 17 so that the upper end portion of the long screw bolt 12 fits into the hole 8. The swivel frame 1 is loaded with the load of the cab 5.

  A washer 18 and a spring washer 19 are sequentially fitted on the long screw bolt 12 from the upper end thereof, and a nut 20 is screwed onto the upper end portion of the long screw bolt 12, and the nut 20 is tightened to make the cab 5 a vibration-proof mount. It is concluded.

  In the conventional cab support structure in which the frame upper member 2 is sandwiched between the anti-vibration rubbers 10 and 16 and the connecting member 6 is fastened to the anti-vibration rubbers 10 and 16 with the long screw bolts 12 and the nuts 13, 14, and 20. Further, the vibration accompanying the movement of the traveling body cannot be sufficiently suppressed from being transmitted from the turning frame 1 to the cab 5.

  In view of this, it has already been proposed to use a liquid-sealed vibration-proof mount for the cab support structure that obtains a damping force by resistance when a viscous liquid passes through a channel having a small cross-sectional area, like an oil damper.

  FIG. 16 shows an example of a liquid-filled vibration-proof mount. The casing 21 is open at the top and has a circular horizontal cross section. The movable plate 22 is disposed in the casing 21 so as to be movable up and down. A mounting shaft 23 that extends upward from the mounting shaft 24, a cylindrical retainer 24 that is externally fitted to the mounting shaft 23, an elastic body 25 that is inscribed in the casing 21 and that is externally fitted to the retainer 24, and an outer edge portion is the upper end of the casing 21. And an annular sealing member 26 whose inner edge portion bites into the elastic body 25 from above, and a viscous liquid 27 enclosed in a space surrounded by the inner surface of the casing 21 and the lower surface of the elastic body 25, and the mounting shaft A nut 28 is screwed onto the tip of 23. Among these members, the elastic body 25 is made of rubber, and the other members are made of metal.

  The movable plate 22 is disc-shaped, and its outer diameter is smaller than the inner diameter of the casing 21, and the viscous liquid 27 is moved between the outer peripheral surface of the movable plate 22 and the inner peripheral surface of the casing 21 as the movable plate 22 moves up and down. A circulating gap 29 is formed. Therefore, when the mounting shaft 23 is biased downward, the viscous liquid 27 on the lower side of the movable plate 22 moves through the gap 29 to the upper side of the movable plate 22. When the mounting shaft 23 is biased upward, the viscous liquid 27 on the upper side of the movable plate 22 moves through the gap 29 to the lower side of the movable plate 22. And the space | gap 29 becomes resistance of the distribution | circulation of the viscous liquid 27, and the movement to the up-down direction of the attachment shaft 23 is attenuated.

  As a prior art document disclosing a cab support structure that suppresses vibration transmitted from the swivel frame to the cab only by vibration-proof rubber, there is Patent Document 1 below, and vibration transmitted from the swivel frame to the cab is described below. As a prior art document disclosing a cab support structure that is suppressed using a liquid-filled vibration-proof mount, there is Patent Document 2 below.

JP 09-088124 A JP 2004-308688 A

  However, if the anti-vibration mount shown in FIG. 16 is to be attached to the revolving frame 1 shown in FIG. 15, compared to the distance A between the frame upper member 2 and the frame lower member 3 (see FIG. 15), Since the length B (see FIG. 16) to the upper end surface of the mounting shaft 23 is long, the vibration isolating mount with the mounting shaft 23 standing upright cannot be inserted between the frame upper member 2 and the frame lower member 3; Therefore, the casing 21 cannot be attached to the lower surface of the frame upper member 2 through the attachment shaft 23 and the retainer 24 from below to above the frame upper member 2.

  That is, the distance between the frame constituent member (the frame upper member 2) to which the vibration isolating mount is attached to the lower surface and the structure (the frame lower member 3) positioned therebelow is the total length of the vibration isolating mount. If it is shorter than the length B and the clearance below the frame constituent member is insufficient, the casing 21 cannot be mounted on the lower side of the frame constituent member.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a cab support structure that can cope with a case where a clearance below a frame constituent member to which a vibration isolating mount is to be attached is narrower than a total length of the vibration isolating mount.

  In order to achieve the above object, the cab support structure according to claim 1 is provided with a vibration isolating mount whose mounting shaft protrudes upward and backward from the casing so as to be able to advance and retreat, and is located above the vibration isolating mount and the mounting A stopper plate having an opening through which a shaft is inserted; and a first protrusion formed on an upper surface of the stopper plate and extending linearly from an outer edge of the stopper plate to an inner edge of the opening, and is positioned above the stopper plate The component member is formed with a slit into which the mounting shaft moves in the radial direction and the first protrusion of the stopper plate is fitted, and the frame component member, the stopper plate, and the vibration-proof mount casing are fastened together. The cab component is fastened to the mounting shaft of the anti-vibration mount.

  The cab support structure according to claim 2 is provided with an anti-vibration mount in which a mounting shaft on which the retainer is externally fitted protrudes upward and backward from the casing, and is positioned above the anti-vibration mount and the retainer is outside. A stopper plate having an opening through which the fitted mounting shaft is inserted, and a first protrusion formed on the upper surface of the stopper plate and extending linearly from the outer edge of the stopper plate to the inner edge of the opening, and above the stopper plate A slit is formed in the positioned frame component member so that the mounting shaft on which the retainer is fitted is moved in the radial direction and the first protrusion of the stopper plate is fitted therein, and the frame component member, the stopper plate, and the vibration isolator The casing of the mount is fastened to each other, the anti-vibration rubber is externally fitted to the retainer, and the cab component is fastened to the mounting shaft of the anti-vibration mount. Sandwiching the rubber cushion with the frame component and the cab component.

  In the cab support structure according to the third aspect, the second protrusion is formed on the upper surface of the stopper plate, and the hole into which the second protrusion of the stopper plate is fitted is formed in the frame constituent member.

  In the cab support structure according to the fourth aspect, a receiving portion that protrudes toward the cab constituent member is provided on the upper surface of the frame constituent member.

  In the cab support structure according to the fifth aspect, a receiving portion that surrounds the anti-vibration rubber in the circumferential direction and protrudes toward the cab component member is provided on the upper surface of the frame component member.

  The cab support structure according to claim 6 includes an anti-vibration mount whose mounting shaft protrudes upward and backward from the casing so as to be able to advance and retreat, and an opening that is positioned above the anti-vibration mount and through which the mounting shaft is inserted. And a first protrusion formed on the lower surface of the stopper plate and extending linearly from the outer edge of the stopper plate to the inner edge of the opening, and is located between the anti-vibration mount and the stopper plate. The mounting shaft of the anti-vibration mount moves in the radial direction and the slit into which the first projection of the stopper plate is fitted is formed, and the stopper plate, the frame constituent member, and the casing of the anti-vibration mount are fastened to each other The cab component is fastened to the mounting shaft of the vibration-proof mount.

  According to a seventh aspect of the present invention, there is provided a cab support structure comprising: a vibration isolating mount in which a mounting shaft externally fitted with a retainer protrudes upward and backward from a casing; and the mounting shaft is positioned above the vibration isolating mount. A stopper plate having an opening to be inserted; and a first protrusion formed on the lower surface of the stopper plate and extending linearly from the outer edge of the stopper plate to the inner edge of the opening, and between the vibration-proof mount and the stopper plate. A slit in which the mounting shaft on which the retainer is externally fitted moves in the radial direction and the first projection of the stopper plate is fitted is formed in the frame constituent member, and the stopper plate, the frame constituent member, and the vibration isolating member The mount casings are fastened to each other, a vibration isolating rubber is fitted on the retainer, and a cab component is fastened to the mounting shaft of the vibration isolating mount. Wherein the catcher blanking component sandwiching the rubber cushion with the stopper plate.

  In the cab support structure according to the eighth aspect, the second protrusion is formed on the lower surface of the stopper plate, and the hole in which the second protrusion of the stopper plate is fitted is formed in the frame constituent member.

  In the cab support structure according to the ninth aspect, a receiving portion that protrudes toward the cab constituent member is provided on the upper surface of the stopper plate.

  In the cab support structure according to the tenth aspect, a receiving portion that surrounds the vibration-proof rubber in the circumferential direction and protrudes toward the cab constituent member is provided on the upper surface of the stopper plate.

  According to the cab support structure of the present invention, the following excellent effects can be obtained.

  (1) In any one of the cab support structures according to claims 1 to 10, the mounting shaft or the mounting shaft on which the retainer is externally fitted is attached in a radial direction to the frame structural member to which the stopper plate attached to the vibration isolating mount is attached. Since the slit that moves in is formed, the anti-vibration mount can be attached to the frame constituent member even if the overall length of the anti-vibration mount is longer than the clearance below the frame constituent member.

  (2) In any of the cab support structures according to claims 3 and 8, even if the vibration isolating mount, the stopper plate, and the member that fastens the frame upper member are damaged, the mounting shaft of the vibration isolating mount is the opening of the stopper plate. Since the second protrusion of the stopper plate is fitted in the hole of the upper frame member, the mounting shaft of the vibration isolating mount does not come out sideways along the slit of the target member. Therefore, even when a large lateral force is applied to the cab during the test of ROPS (Roll-Over Protective Structure), which is a standard for protecting the operator when the vehicle construction machine falls, the cab is detached from the turning frame. I can prevent that.

  (3) In any of the cab support structures described in claims 4, 5, 9, and 10, when the cab that has received a large lateral force is inclined and the lower surface of the cab constituent member comes into contact with the receiving portion, the cab is largely inclined. As a result, excessive force does not act on the member and the vibration-proof mount that fasten the vibration-proof mount housing, the stopper plate, and the frame constituent members to each other.

It is a longitudinal cross-sectional view which shows the 1st example of the cab support structure of this invention. It is an II-II arrow line view of FIG. It is the III-III arrow line view of FIG. 2 which saw through the frame upper side member. It is a top view of the stopper plate relevant to FIG. It is a VV arrow line view of FIG. It is a top view of the flame | frame upper side member relevant to FIG. It is a longitudinal cross-sectional view which shows the 2nd example of the cab support structure of this invention. It is a VIII-VIII arrow line view of FIG. It is a bottom view of the stopper plate relevant to FIG. It is a XX arrow line view of FIG. It is a partially cut outline figure which shows the 3rd example of the cab support structure of this invention. FIG. 12 is a plan view of a lateral fall restricting member related to FIG. 11. It is a partially cut outline figure which shows the 4th example of the cab support structure of this invention. It is a top view of the stopper plate relevant to FIG. It is a longitudinal cross-sectional view which shows an example of the conventional cab support structure. It is a longitudinal section showing an example of a liquid enclosure type vibration proof mount.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 6 show a first example of a cab support structure of the present invention, which includes a vibration isolating mount 30, a stopper plate 31, and a vibration isolating rubber 32. The vibration isolating mount 30 is shown in FIG. The configuration is similar to that shown. In the figure, the same reference numerals as those in FIG. 15 denote the same components. This cab support structure corresponds to claims 1 to 3.

  The stopper plate 31 has an opening 33 through which the mounting shaft 23 and the retainer 24 of the anti-vibration mount 30 are inserted, and the lower surface abuts against the elastic body 25 and the sealing member 26 incidental to the casing 21. On the upper surface of the stopper plate 31, a first protrusion 34 linearly extending from the outer edge thereof to the inner edge of the opening 33, and a second protrusion 35 independent of the first protrusion 34 are formed. Further, a plurality of bolt holes 36 penetrating the stopper plate 31 in the vertical direction are formed at locations where the first and second protrusions 34 and 35 are not formed. This stopper plate 31 is made of metal.

  The mounting shaft 23 and the retainer 24 are inserted into the opening 33, and the first and second members are viewed from the bottom surface of the casing 21 in a state where the elastic body 25 and the sealing member 26 of the vibration-proof mount 30 are in contact with the lower surface of the stopper plate 31. The length C to the upper surface of the protrusions 34 and 35 is shorter than the distance A between the frame upper member 2 and the frame lower member 3.

  A slit into which the mounting shaft 23 and the retainer 24 of the anti-vibration mount 30 move in the radial direction and the first protrusion 34 of the stopper plate 31 fits in the frame upper member 2 of the revolving frame 1 to which the anti-vibration mount 30 is attached. 37 and a hole 38 into which the second protrusion 35 of the stopper plate 31 is fitted. In FIG. 1, the upper surface of the second protrusion 35 fitted in the hole 38 is continuous with the upper surface of the frame upper member 2, but the second protrusion 35 is formed low so that the upper surface is positioned inside the hole 38. It may be.

  A plurality of bolt holes 39 and 40 are formed in the casing 21 and the frame upper member 2 of the vibration isolating mount 30 so as to correspond to the bolt holes 36, and the casing 21, the stopper plate 31, and the frame upper member 2. Are fastened to each other by a bolt 41 inserted through the bolt holes 39, 36, and 40 and a nut 42 screwed into the bolt 41. Further, the casing 21 and the frame upper member 2 may be fastened with bolts, and the stopper plate 31 and the frame upper member 2 may be fastened with different bolts.

  When fastening the vibration isolating mount 30 and the stopper plate 31 to the frame upper member 2, the mounting shaft 23 and the retainer 24 are inserted into the opening 33, and the elastic body 25 and the sealing member 26 of the vibration isolating mount 30 are moved. It is brought into contact with the lower surface of the stopper plate 31. Next, the anti-vibration mount 30 is set in an upright posture, and the anti-vibration mount 30 and the stopper plate 31 are moved sideways with the first and second protrusions 34 and 35 positioned below the frame upper member 2. The mounting shaft 23 and the retainer 24 are inserted into the slit 37 of the frame upper member 2. Further, the anti-vibration mount 30 and the stopper plate 31 are lifted so that the first projection 34 is fitted into the slit 37 and the second projection 35 is fitted into the hole 38, so that the frame upper member 2, the stopper plate 31, and the anti-shock The vibration mount 30 is fastened with a bolt 41 and a nut 42.

  The anti-vibration rubber 32 is fitted on the retainer 24 of the anti-vibration mount 30 and has a shape that comes into contact with the upper surface of the frame upper member 2 and the upper surfaces of the first and second protrusions 34 and 35 of the stopper plate 31. Yes. Further, the cab component member 43 is provided with a hole 44 through which the mounting shaft 23 of the vibration-proof mount 30 can be inserted. The cab constituent member 43 may be the connecting member 6 (see FIG. 15) described above or a cab floor board.

  An anti-vibration rubber 32 is externally fitted to the retainer 24 from the upper end of the mounting shaft 23 of the anti-vibration mount 30, and a washer 45 is externally fitted to the mounting shaft 23 from the upper end, and then the upper end of the mounting shaft 23 is inserted into the hole 44. The cab constituting member 43 is placed on the washer 45 so that the portion fits, and the swivel frame 1 is loaded with the load of the entire cab.

  Further, a washer 46 is externally fitted to the mounting shaft 23 of the vibration isolating mount 30 from the upper end thereof, and a nut 28 is screwed onto the upper end portion of the mounting shaft 23, and the nut 28 is tightened to attach the cab to the vibration isolating mount 30. It is concluded. And the vibration isolating mount 30 and the vibration isolating rubber 32 suppress the vibration accompanying the operation of the attachment and the movement of the traveling body from being transmitted from the revolving frame 1 to the cab.

  In the cab support structure shown in FIGS. 1 to 6, the frame upper member 2 is formed with a slit 37 into which the mounting shaft 23 and the retainer 24 of the vibration isolating mount 30 move in the radial direction. Since the length C from the bottom surface to the top surfaces of the first and second protrusions 34 and 35 of the stopper plate 31 is shorter than the distance A between the frame upper member 2 and the frame lower member 3, the frame upper member 2 and the frame Compared to the distance A between the lower members 3 (the clearance below the target member to which the anti-vibration mount 30 is to be attached), the length B (anti-vibration) from the bottom surface of the casing 21 of the anti-vibration mount 30 to the upper end surface of the mounting shaft 23 Even if the overall length of the mount 30 is long, the vibration-proof mount 30 can be attached to the frame upper member 2.

  Even if the bolt 41 that fastens the vibration isolating mount 30, the stopper plate 31, and the frame upper member 2 is damaged, the mounting shaft 23 and the retainer 24 of the vibration isolating mount 30 are inserted into the opening 33 of the stopper plate 31. In addition, since the second protrusion 35 of the stopper plate 31 is fitted in the hole 38 of the frame upper member 2, the mounting shaft 23 and the retainer 24 of the vibration isolating mount 30 extend along the slit 37 of the frame upper member 2. And will not slip out sideways.

  Therefore, even when a large lateral force is applied to the cab during the test of ROPS (Roll-Over Protective Structure), which is a standard for protecting the operator when the vehicle construction machine falls, the cab is detached from the turning frame 1 You can prevent it.

  FIGS. 7-10 shows the 2nd example of the cab support structure of this invention, and it is equipped with the anti-vibration mount 30, the stopper plate 47, and the anti-vibration rubber 32, in FIG. Parts with the same reference numerals represent the same thing. This cab support structure corresponds to claims 6-8.

  The stopper plate 47 has a shape obtained by vertically inverting the stopper plate 31 (see FIGS. 1 to 5) described above, and has an opening 48 through which the mounting shaft 23 and the retainer 24 of the vibration isolating mount 30 are inserted. The lower surface is in contact with the upper surface of the frame upper member 2. On the lower surface of the stopper plate 47, a first protrusion 49 that linearly extends from the outer edge to the inner edge of the opening 48 and fits into the slit 37 of the frame upper member 2, and the first protrusion 49 is independent of the frame. A second protrusion 50 that fits into the hole 38 of the upper member 2 is formed. Further, a plurality of bolt holes 51 penetrating the stopper plate 47 in the vertical direction are formed at locations where the first and second protrusions 49 and 50 are not formed. The stopper plate 47 is made of metal.

  The bolt holes 51 of the stopper plate 47 correspond to the casing holes 31 and 40 of the case mount plate 31 and the frame upper member 2 of the anti-vibration mount 30, and the casing 21, the frame upper member 2 and the stopper plate 47, and the bolt holes 39. , 40, 51 and a bolt 41, and a nut 42 screwed onto the bolt 41 and fastened to each other.

  When the vibration isolation mount 30 and the stopper plate 47 are fastened to the frame upper member 2, the attachment shaft 23 and the retainer 24 are inserted through the opening 48. Next, with the vibration-proof mount 30 in an upright posture, the first and second protrusions 34 and 35 are located above the frame upper member 2 and the casing 21 is located below the frame upper member 2. The anti-vibration mount 30 and the stopper plate 47 are moved sideways, and the mounting shaft 23 and the retainer 24 are inserted into the slit 37 of the frame upper member 2. Further, the stopper plate 47 is lowered, the first projection 49 is fitted into the slit 37, and the second projection 50 is fitted into the hole 38 so that the stopper plate 47, the frame upper member 2 and the vibration isolating mount 30 are Fasten with bolts 41 and nuts 42.

  Thereafter, the anti-vibration rubber 32 is externally fitted to the retainer 24 from the upper end of the mounting shaft 23 of the anti-vibration mount 30 to place the anti-vibration rubber 32 on the stopper plate 47, and the cab shown in FIGS. The cab is fastened to the vibration isolating mount 30 by the same procedure as that of the support structure. And the vibration isolating mount 30 and the vibration isolating rubber 32 suppress the vibration accompanying the operation of the attachment and the movement of the traveling body from being transmitted from the revolving frame 1 to the cab.

  Even if the bolt 41 that fastens the vibration isolating mount 30, the stopper plate 47, and the frame upper member 2 is damaged, the mounting shaft 23 and the retainer 24 of the vibration isolating mount 30 are inserted into the opening 48 of the stopper plate 47. In addition, since the second protrusion 50 of the stopper plate 47 is fitted into the hole 38 of the frame upper member 2, the mounting shaft 23 and the retainer 24 of the vibration isolating mount 30 extend along the slit 37 of the frame upper member 2. And will not slip out sideways.

  Therefore, even when a large lateral force is applied to the cab during the test of ROPS (Roll-Over Protective Structure), which is a standard for protecting the operator when the vehicle construction machine falls, the cab is detached from the turning frame 1 You can prevent it.

  FIGS. 11 and 12 show a third example of the cab support structure of the present invention, which includes a vibration isolating mount 30, a stopper plate 31, a vibration isolating rubber 32, and a sideways fall-down regulating member 52. 1 to 6 denote the same parts. This cab support structure corresponds to claims 4 and 5.

  The side-falling regulation member 52 has an opening 53 into which the anti-vibration rubber 32 enters in the center portion, and the lower surface abuts on the upper surface of the frame upper member 12. An annular receiving portion 54 is formed on the upper surface of the side-falling regulating member 52 so as to protrude from the entire outer edge of the side-falling regulating member 52 toward the cab constituting member 43. Further, a plurality of bolt holes 55 penetrating the side-falling regulation member 52 in the vertical direction are formed at locations where the receiving portion 54 is not formed. This side-falling regulating member 52 is made of metal.

  The bolt holes 55 of the side-falling regulation member 52 correspond to the casing 21, the stopper plate 31, and the bolt holes 39, 36, and 40 of the frame upper member 2, and the casing 21, the stopper plate 31, and the frame upper side. The member 2 and the side-falling regulation member 52 are fastened to each other by a bolt 41 inserted through the bolt holes 39, 36, 40, and 55 and a nut 42 that is screwed and tightened to the bolt 41.

  When fastening the vibration isolating mount 30, the stopper plate 31, and the sideways fall restricting member 52 to the frame upper member 2, the mounting shaft 23 and the retainer 24 (see FIGS. 1 and 3) are inserted through the opening 33. Then, the elastic body 25 and the sealing member 26 (see FIG. 1) of the vibration isolating mount 30 are brought into contact with the lower surface of the stopper plate 31. Next, the anti-vibration mount 30 and the stopper are placed in a state where the anti-vibration mount 30 is in an upright posture and the first and second protrusions 34 and 35 (see FIGS. 2 to 5) are positioned below the frame upper member 2. The plate 31 is moved sideways, and the mounting shaft 23 and the retainer 24 are inserted into the slit 37 of the frame upper member 2. Further, the vibration-proof mount 30 and the stopper plate 31 are lifted so that the first projection 34 is fitted into the slit 37 and the second projection 35 is fitted into the hole 38 (see FIGS. 3 and 6). The fall regulation member 52 is placed on the upper surface of the frame upper member 2, and the lateral fall regulation member 52, the frame upper member 2, the stopper plate 31, and the vibration isolation mount 30 are fastened with bolts 41 and nuts 42.

  Thereafter, the anti-vibration rubber 32 is externally fitted to the retainer 24 (see FIGS. 1 and 3) from the upper end of the mounting shaft 23 of the anti-vibration mount 30 so that the anti-vibration rubber 32 is mounted on the frame upper member 2. The cab is fastened to the vibration isolating mount 30 by the same procedure as the cab support structure shown in FIGS. And the vibration isolating mount 30 and the vibration isolating rubber 32 suppress the vibration accompanying the operation of the attachment and the movement of the traveling body from being transmitted from the revolving frame 1 to the cab.

  When the cab receives a large lateral force and starts to tilt with respect to the revolving frame 1, the lower surface of the cab component member 43 partially contacts the receiving portion 54 of the lateral fall control member 52, thereby suppressing the cab from being largely tilted. . Thereby, excessive force does not act on the vibration-proof mount 30 and the bolt 41. Moreover, since the receiving part 54 is cyclic | annular, it can respond even if the inclination of a cab is any of front and rear, right and left. The shape of the receiving portion is not limited to the annular shape shown in FIGS. For example, the anti-vibration rubber 30 may be surrounded by using a frame-shaped receiving portion, or a plurality of block-shaped receiving portions may be arranged around the anti-vibration rubber 30. Furthermore, when suppressing the inclination of the cab in a specific direction, it is only necessary to provide a receiving portion only on the side where the cab is inclined.

  FIGS. 13 and 14 show a fourth example of the cab support structure of the present invention, which includes an anti-vibration mount 30, a stopper plate 56 that also serves as a side-down regulating member, and an anti-vibration rubber 32. 7 to 10 denote the same parts. This cab support structure corresponds to claims 9 and 10.

  The stopper plate 56 has an opening 57 through which the mounting shaft 23 of the vibration-proof mount 30 and the retainer 24 (see FIGS. 1 and 3) are inserted, and the lower surface abuts on the upper surface of the frame upper member 2. On the lower surface of the stopper plate 56, a first protrusion 58 that linearly extends from the outer edge thereof to the inner edge of the opening 57 and fits into the slit 37 of the frame upper member 2, and the first protrusion 58 is independent of the frame. A second protrusion 59 that fits into the hole 38 (see FIGS. 3 and 6) of the upper member 2 is formed. An annular receiving portion 60 is formed on the upper surface of the stopper plate 56 so as to protrude from the entire outer edge of the stopper plate 56 toward the cab constituent member 43. Further, a plurality of bolt holes 61 penetrating the stopper plate 56 in the vertical direction are formed at locations where the first and second protrusions 58 and 59 are not formed. The stopper plate 56 is made of metal.

  The bolt holes 61 of the stopper plate 56 correspond to the bolt holes 39 and 40 of the casing 21 and the frame upper member 2 of the vibration isolating mount 30, and the casing 21, the frame upper member 2 and the stopper plate 56 are bolt holes 39, 40. The bolts 41 inserted into the bolts 36, 40, and 61 and the nuts 42 that are screwed into the bolts 41 are fastened to each other.

  When the vibration isolation mount 30 and the stopper plate 56 are fastened to the frame upper member 2, the attachment shaft 23 and the retainer 24 (see FIGS. 1 and 3) are inserted through the opening 57. Next, with the anti-vibration mount 30 in an upright posture, the first and second protrusions 58 and 59 are positioned above the frame upper member 2 and the casing 21 is positioned below the frame upper member 2, The anti-vibration mount 30 and the stopper plate 56 are moved sideways, and the mounting shaft 23 and the retainer 24 (see FIGS. 1 and 3) are inserted into the slit 37 of the frame upper member 2. Further, the stopper plate 56 is lowered so that the first protrusion 58 is fitted into the slit 37 and the second protrusion 59 is fitted into the hole 38 (see FIGS. 3 and 6). 2 and the vibration-proof mount 30 are fastened with bolts 41 and nuts 42.

  After that, the frame upper member 2 is placed on the stopper plate 56 by fitting the anti-vibration rubber 32 from the upper end of the mounting shaft 23 of the anti-vibration mount 30 to the retainer 24 (see FIGS. 1 and 3). The cab is fastened to the vibration isolating mount 30 by the same procedure as the cab support structure shown in FIG. And the vibration isolating mount 30 and the vibration isolating rubber 32 suppress the vibration accompanying the operation of the attachment and the movement of the traveling body from being transmitted from the revolving frame 1 to the cab.

  When the cab receives a large lateral force and starts to tilt with respect to the revolving frame 1, the lower surface of the cab constituting member 43 partially contacts the receiving portion 60 of the stopper plate 56, thereby suppressing the cab from being largely tilted. Thereby, excessive force does not act on the vibration-proof mount 30 and the bolt 41. Moreover, since the receiving part 60 is cyclic | annular, it can respond even if the inclination of a cab is any of front and rear, right and left. The shape of the receiving portion is not limited to the annular shape shown in FIGS. For example, the anti-vibration rubber 30 may be surrounded by using a frame-shaped receiving portion, or a plurality of block-shaped receiving portions may be arranged around the anti-vibration rubber 30. Furthermore, when suppressing the inclination of the cab in a specific direction, it is only necessary to provide a receiving portion only on the side where the cab is inclined.

  It should be noted that the cab support structure of the present invention is not limited to the above-described embodiment, and it is needless to say that changes can be made without departing from the gist of the present invention.

2 Frame upper member (Frame component)
21 Casing 23 Mounting shaft 24 Retainer 30 Anti-vibration mount 31, 47, 56 Stopper plate 32 Anti-vibration rubber 33, 48, 57 Opening 34, 49, 58 First projection 35, 50, 59 Second projection 37 Slit 38 Hole 43 Cab component members 54 and 60

Claims (10)

An anti-vibration mount whose mounting shaft protrudes upward and backward from the casing;
A stopper plate located above the vibration-proof mount and having an opening through which the mounting shaft is inserted;
A first protrusion formed on the upper surface of the stopper plate and extending linearly from the outer edge of the stopper plate to the inner edge of the opening,
The frame constituting member positioned above the stopper plate is formed with a slit into which the mounting shaft moves in the radial direction and the first protrusion of the stopper plate is fitted,
Fasten the frame component member, the stopper plate, and the vibration-proof mount casing to each other,
A cab support structure in which a cab constituent member is fastened to a mounting shaft of an anti-vibration mount. An anti-vibration mount in which a mounting shaft on which the retainer is externally fitted protrudes upward and backward from the casing;
A stopper plate which is located above the vibration-proof mount and has an opening through which a mounting shaft on which the retainer is externally fitted is inserted;
A first protrusion formed on the upper surface of the stopper plate and extending linearly from the outer edge of the stopper plate to the inner edge of the opening,
The frame component located above the stopper plate forms a slit into which the mounting shaft on which the retainer is externally fitted moves in the radial direction and the first protrusion of the stopper plate is fitted,
Fasten the frame component member, the stopper plate, and the vibration-proof mount casing to each other,
Anti-vibration rubber is externally fitted to the retainer,
A cab support structure characterized in that a cab component is fastened to a mounting shaft of a vibration proof mount, and vibration proof rubber is sandwiched between the cab component and the frame component. Forming a second protrusion on the upper surface of the stopper plate;
The cab support structure according to claim 1, wherein a hole into which the second protrusion of the stopper plate is fitted is formed in the frame constituent member.   The cab support structure according to any one of claims 1 to 3, wherein a receiving portion that protrudes toward the cab constituent member is provided on an upper surface of the frame constituent member.   4. The cab support structure according to claim 2, wherein a receiving portion that surrounds the vibration-proof rubber in the circumferential direction and protrudes toward the cab component is provided on an upper surface of the frame component. An anti-vibration mount whose mounting shaft protrudes upward and backward from the casing;
A stopper plate located above the vibration-proof mount and having an opening through which the mounting shaft is inserted;
A first protrusion formed on the lower surface of the stopper plate and extending linearly from the outer edge of the stopper plate to the inner edge of the opening,
The frame component located between the vibration isolating mount and the stopper plate is formed with a slit into which the mounting shaft of the vibration isolating mount moves in the radial direction and the first protrusion of the stopper plate is fitted,
Fasten the stopper plate, the frame component, and the vibration-proof mount casing to each other,
A cab support structure in which a cab constituent member is fastened to a mounting shaft of an anti-vibration mount. An anti-vibration mount in which a mounting shaft externally fitting the retainer protrudes upward and backward from the casing;
A stopper plate located above the vibration-proof mount and having an opening through which the mounting shaft is inserted;
A first protrusion formed on the lower surface of the stopper plate and extending linearly from the outer edge of the stopper plate to the inner edge of the opening,
The frame component located between the vibration-proof mount and the stopper plate forms a slit into which the mounting shaft on which the retainer is externally fitted moves in the radial direction and the first protrusion of the stopper plate is fitted,
Fasten the stopper plate, the frame component, and the vibration-proof mount casing to each other,
Anti-vibration rubber is externally fitted to the retainer,
A cab support structure characterized in that a cab component is fastened to a mounting shaft of a vibration proof mount, and vibration proof rubber is sandwiched between the cab component and the stopper plate. Forming a second protrusion on the lower surface of the stopper plate;
The cab support structure according to claim 1, wherein a hole into which the second protrusion of the stopper plate is fitted is formed in the frame constituent member.   The cab support structure according to any one of claims 1 to 3, wherein a receiving portion that protrudes toward the cab constituent member is provided on an upper surface of the stopper plate.   4. The cab support structure according to claim 2, wherein a receiving portion that surrounds the vibration-proof rubber in the circumferential direction and protrudes toward the cab constituent member is provided on an upper surface of the stopper plate. 5.

Images