JP2006168622A - Cab support device - Google Patents

Abstract

An object of the present invention is to easily disassemble a maintenance structure on a maintenance site without impairing the functionality of a mounting structure for regulating means for lateral load of a cab.
A cab 1 is supported on a vehicle body frame via a damper mount 11, and when the cab 1 is displaced more than specified in the extension direction of the damper mount 11 due to a lateral load in the vicinity thereof, the displacement is reduced. In the cab support device including the restricting means 20 for restricting the displacement exceeding, the restricting means 20 contacts the cab support frame 5 provided on the vehicle body frame side during operation to restrict the displacement, and the restriction member 21. An attachment bolt 23 for attaching the member 21 to the cab 1 and a rotation prevention restricting plate 24 for restricting the rotation of the attachment bolt 23 are provided.
[Selection] Figure 1

Description

  The present invention relates to a cab support device having a function capable of preventing a cab from being lifted by receiving a lateral load.

  Generally, in a work vehicle (construction machine) such as a hydraulic excavator, a turning frame is provided via a turning mechanism on a lower traveling body having a running function, and the working machine is moved while turning the turning frame according to the work situation. It is configured to operate and perform operations such as excavation and lifting. In addition, a cab provided in this type of machine is provided on the turning frame via a buffer mechanism in order to mitigate an impact during traveling and improve the riding comfort.

  Moreover, a work vehicle such as a hydraulic excavator is not limited to a flat place in the work, and often works on an unstable place such as an irregular terrain or an inclined land. Therefore, in work in the unstable place, EOPS (which has a protective function for protecting the driver sitting in the driver's seat in the cab from a large impact received during rock work or during other work. EXCAVATOR'S OPERATOR PROTECTION STRUCTURE) compatible cabs have been used. As a cab equipped with a function capable of handling such a large impact force, the cab can be swung by a lateral load even if the buffer mechanism (attenuation mechanism) provided at the location that supports the cab is damaged when the impact force is received. It is more useful to attach a device that prevents the surface from floating on the frame (see Patent Document 1). There is also known a support mechanism that protects the cab cushioning mechanism as a device that prevents the cab from floating above the revolving frame (see Patent Document 2).

JP 2004-189089 A JP 2001-193103 A

  In the cab support structure known from Patent Document 1, a predetermined displacement (such as lifting) occurs in the cab with respect to the extension direction of the damping mechanism in the vicinity of the damping mechanism (damper mount) that directly supports the cab. Only in some cases, a restriction member (stopper) that restricts displacement exceeding the displacement is provided. The regulating member is fastened to the member extending downward from the bottom of the cab using a single mounting bolt. As the mounting bolt for attaching the regulating member, a bolt having a large size is used because a strength sufficient to resist the load is required even when a large load is suddenly received. Therefore, the fastening bolt is fastened with a large tightening torque so as not to loosen due to vibration during operation.

  For this reason, in a construction machine adopting this cab support structure, when removing the cab from the vehicle body side frame (for example, a swing frame in a hydraulic excavator) for maintenance, the fastening bolts to which the restriction members are attached are removed. Since it cannot be disassembled unless it is removed, it is difficult to remove the fastening bolt, for example, in a situation where a serviceman performs disassembly work at the customer alone, unlike during assembly at the production site. There is.

  The present invention has been made to solve such problems, and has a structure in which the disassembling work at the maintenance site is facilitated without impairing the functionality of the mounting structure of the regulating means for the lateral load of the cab. An object of the present invention is to provide a support device for a certain cab.

In order to achieve the above object, a cab support device according to the present invention comprises:
The cab is supported on the vehicle body frame via a damper mount, and when the cab is displaced more than a specified amount in the extension direction of the damper mount in the vicinity of the damper mount, the displacement exceeding the specified amount is restricted. In the cab support device including the restriction means, the restriction means is a contact member that is in contact with the support frame provided on the vehicle body frame side during operation, restricts the displacement, a mounting bolt that attaches the restriction member to the cab, and A rotation stop restricting plate for restricting the rotation of the mounting bolt is provided.

  The restricting member is attached to the cab with a mounting bolt, and is provided with a separate bolt at a position appropriately separated from the fastening shaft center of the mounting bolt by a detent restricting plate having a locking hole that engages the head of the mounting bolt. The anti-rotation restricting plate may be attached to a restricting member to prevent the attachment bolt from loosening (second invention). Further, the locking hole of the anti-rotation restricting plate is formed with a large number of engagement cuts that engage with the corners of the bolt head on the inner periphery, and the positional relationship between the mounting bolt and the fixing bolt attaching hole of the anti-rotation restricting plate is determined. It is preferable that the head of the mounting bolt is locked and held by selecting the engagement cutting position of the locking hole in a steady state (third invention).

  According to the present invention, when the restriction member of the restriction means for restricting the displacement mounted together with the damper mount is attached to the cab by the attachment bolt, the attachment bolt is loosened due to vibration between the restriction member and the attachment bolt. In addition, it prevents the rotation at the time of installation and at the same time facilitates the fastening operation. In the situation where the disassembly work at home is performed alone, the disassembly and assembly are facilitated, and the maintenance work can be improved.

  In addition, by adopting the configuration of the second invention, the strength of the mounting bolt, which requires a predetermined tightening torque to maintain the strength, is maintained by tightening to such an extent that it can be easily operated during maintenance. Maintenance is performed by engaging the locking hole of the rotation prevention restricting plate with the head of the bolt separately and fixing the rotation prevention restricting plate with a separate fixing bolt at a place away from the axial center position to prevent loosening. When disassembling sometimes, if the fixing bolt of the detent restriction plate is removed, a large tightening torque does not act on the disassembling operation of the mounting bolt, so it becomes possible to disassemble the serviceman easily. Thus, maintenance can be improved.

  Furthermore, in the third aspect of the present invention, it is possible to select an engagement notch position with respect to the corners of the bolt heads, which are formed in large numbers, as the engagement position with the head of the mounting bolt in the locking hole of the anti-rotation restricting plate. Thus, even if the fixing bolt position of the detent restriction plate is specified, there is an advantage that the position adjustment can be easily performed, the detent restriction plate can be fixed without difficulty, and the mounting bolt can be fixed and held correctly.

  Next, a specific embodiment of a cab support device according to the present invention will be described with reference to the drawings.

  FIG. 1 is a front view of a cab support device according to an embodiment of the present invention. 2 is a perspective view taken along the line AA of FIG. 1, FIG. 3 is a plan view of the cab support frame, FIG. 4 is an exploded perspective view of the main part of the cab support device, and FIG. The figure showing the attachment attitude | position selection aspect of the detent | locking control board with respect to a volt | bolt is each shown.

  In this embodiment, a cab support structure in a hydraulic excavator will be described. The cab 1 has a structure corresponding to EOPS, columns are erected from the four corners of the floor frame 2, a ceiling wall is attached to the top, a wall panel is enclosed except for the surrounding entrance and exit, and the front, side, and rear Windows are provided (both not shown). The rear columns 3b and 3b are larger than the front columns 3a compared to the columns 3a and 3a disposed in the front, and the front columns 3a are wide to improve visibility. The rear strut 3b is set to be more rigid than the front strut 3a.

  The cab support device 10 includes a damper mount 11 (a support body provided with a damping mechanism) on the cab support frame 5 on the vehicle body side at a position close to each of the columns 3a and 3b at the front position and the rear position. The floor frame 2 of the cab 1 is floated and supported by these four damper mounts 11. In particular, a restricting means 20 that restricts displacement exceeding the displacement only when the cab 1 is displaced more than specified in the extension direction of the damper mount 11A by a lateral load at a position close to the damper mount 11A at the rear position. Is attached. Here, the prescribed displacement is the maximum displacement in the elastic deformation region of the damper mount. Or it may be the maximum stroke of the regular stroke of the damper mount.

  The damper mount 11 (11A) includes a cup-shaped damper body 12 having a closed structure provided with a mounting seat 12 'for fastening a bolt to the cab support frame 5 around the upper edge, and a cap-like shape accommodated in the damper body 12. A shock absorber 13 formed on the upper surface of the damper body 12, an attachment mount 14 made of an elastic material that covers and fixes the damper body 12, and the center of the attachment mount 14 is inserted into the damper body 12 to be inserted into the damper body 12. A rod 15 connected to the buffer 13 is provided. The shock absorber 13 is coaxially connected by a bolt 16 to a screw hole provided at the lower end of the rod 15 inserted through the central hole of the mounting mount 14 through a mounting hole provided in the center of the upper surface. . Further, an upward biasing force is applied to the rod 15 via the buffer body 13 with a coil spring 17 interposed between the inner bottom portion of the damper main body 12 and the buffer body 13. A viscous fluid 18 such as silicone oil is filled and sealed in the internal space of the damper main body 12. An annular partition plate 19 is disposed below the mounting mount 14, and the viscous fluid 18 can be transferred to a space portion a formed between the partition plate 19 and the mounting mount 14. ing. The damper mount 11 (11 </ b> A) configured in this manner is inserted into the mounting hole 4 provided in the floor frame 2 of the cab 1 through the stud 15 a protruding from the upper end of the rod 15 and fastened to the stud 15 a by the nut 7. It has become.

  The cab support damper mount 11 (11A) having such a structure is configured such that when an external force is applied in a direction to be pressed down by the supporting cab 1 and the buffer body 13 is pressed down by the rod 15, the outer periphery of the skirt portion of the buffer body 13 is reduced. The vibration is damped by the flow resistance of the viscous fluid 18 passing through the annular gap t between the end edge and the inner wall of the damper main body 12. Further, when acting in the pushing-up direction, when the buffer body 13 is lifted by the built-in accumulating force of the coil spring 17, the viscous fluid 18 in the upper space a reverses and restores in reverse to the above operation. Therefore, even if the cab 1 directly supported by the four damper mounts 11 moves up and down by an external force, the cushioning function is exhibited and the cab 1 operates comfortably.

  As shown in FIGS. 1 and 4, the restricting means 20 provided near the rear support column 3 b is suspended from the lower surface of the floor frame 2 of the cab 1 and is provided at a position facing the cab support frame 5. When the regulating member 21 is arranged at a position protruding downward from the formed watermark hole 6 and an abnormal situation occurs and the cab 1 is largely lifted upward, the regulating member 21 is placed on the lower surface around the watermark hole 6. It is restricted so as to abut and prevent further upward movement.

  As a specific example, the restricting means 20 includes a hollow shaft body 22 which is fixedly suspended by welding one end to the lower surface of the floor frame 2 of the cab 1, and a central portion in contact with the lower end surface of the shaft body 22. And a restricting member 21 fixed by a hexagonal bolt (mounting bolt 23) and a detent restricting plate 24 of the mounting bolt 23 for fixing the restricting member 21. The restricting member 21 is fixed by a mounting bolt 23 having a diameter larger than the outer diameter of the shaft body 22 and screwed into a female screw 22 ′ formed in the hollow hole of the shaft body 22, and on the outside of the shaft body 22. The lock pin 26 and the stationary hole 27 fixed along the side are engaged to prevent rotation. The anti-rotation restricting plate 24 of the mounting bolt 23 is externally fitted to the head 23a of the mounting bolt 23 and fixed to the restricting member 21, and is a polygon in which the head 23a of the mounting bolt 23 is engaged. A locking hole 25 formed in a shape is provided. The locking holes 25 are equally formed at twelve incisions 25a on the inner peripheral surface where the corners 23a 'of the hexagonal heads 23a of the mounting bolts 23 are engaged. In addition, the detent restricting plate 24 is fixed to the detent restricting plate 24 by screwing a fixing bolt 29 into a screw hole 28 provided in the restricting member 21 at a position away from the axial center of the locking hole 25. Mounting holes 24a are provided at two locations so that they can be made. Reference numerals 31 and 32 in the figure denote washers.

  The relationship between the anti-rotation restricting plate 24 and the mounting bolt 23 that fixes the restricting member 21 is that a large load that lifts the cab 1 due to a lateral load acting on the cab 1 is abruptly applied to the restricting member 21. When it acts, a large mounting bolt 23 is required which requires strength to withstand this. And it is requested | required of mounting | wearing so that looseness may arise by the vibration accompanying driving | running | working of a vehicle, and it may not fall off. Incidentally, the mounting bolt 23 of the regulating member 21 is, for example, M30. Therefore, if the mounting bolt 23 is normally tightened with a strong tightening torque and the regulating member 21 is fixed, for example, when performing maintenance of a hydraulic excavator at the site of use, a service person alone is required to mount the mounting bolt 23. When it becomes necessary to remove, it is very difficult to disassemble using a normal tool.

  Therefore, when using the restricting means 20, the mounting bolt 23 of the restricting member 21 is fastened in a state where the restricting member 21 is attached to the shaft body 22, in other words, the attaching bolt 23 is not removed from the internal bolt of the shaft body 22. It is screwed onto the part 22 'and attached. Then, the locking hole 25 of the anti-rotation restricting plate 24 is fitted over the hexagonal head 23 a of the mounting bolt 23, and the mounting hole 24 a is aligned with the screw hole 28 of the restricting member 21 and fastened with the fixing bolt 29. Like that. In this way, the rotation preventing restricting plate 24 is fixed to the restricting member 21, and the locking hole 25 prevents the attaching bolt 23 fitted on the head portion 23a from rotating, so that the attaching bolt 23 is fixed even when receiving external force. Therefore, the object can be achieved without loosening. In maintenance, if the fixing bolt 29 is attached and detached with a small fastening tool (for example, using a small impact wrench), the mounting bolt 23 can be easily removed, so that the work is not hindered. The restricting member 21 is easily engaged in the operation of the lower side of the cab support frame 5 by the engagement of the lock pin 26 and the stationary hole 27 without rotating together with the mounting bolt 23. It can be carried out.

  Further, when the rotation restricting restricting plate 24 is attached to the attaching bolt 23 of the restricting member 21, as described above, the engaging hole 25 is formed with the notches 25a equally formed at 12 locations on the inner periphery and fixed. Since the mounting holes 24a by the bolts 28 are provided in two places, even if the bolt head 23a is not uniform when the mounting bolt 23 to which the regulating member 21 is attached is tightened, for example, FIG. As shown by (d), the anti-rotation restricting plate 24 is mounted on the front and back surfaces with reference to the mounting position of the fixing bolt 28 according to the condition corresponding to the direction of the corner 23a 'of the bolt head 23a. The positions of the mounting holes 24a, 24a and the corner 23a 'of the bolt head 23a are determined so that they can be fixed with the fixing bolt 28. For example, when the position shown in FIG. ), When it is displaced by 15 ° more than that, or when it is displaced by 45 ° as shown in FIG. 5D, the anti-rotation restricting plate 24 is reversed and used. Thus, four types of selections can be made by rotating and adjusting the head 23a of the mounting bolt 23, and if the fixing bolt 21 is fixed at the selected position, the regulating member 21 can be fixed and prevented from loosening by the mounting bolt 23 without difficulty.

  As described above, according to the present embodiment, as the restricting means 20 provided in the cab support device 10, the attachment structure of the restriction member 21 is configured to be easy to attach and detach using a small tool. Therefore, disassembly and assembly can be performed without the need for a tool used for the assembly operation, and the work can be facilitated. In addition, the function as the regulating means 20 can be exhibited without impairing the original function. Naturally, the mounting operation on the assembly line becomes easy, and the workability during production can be improved.

The front view of the support device of the cab by one embodiment of the present invention. AA view of FIG. Top view of cab support frame An exploded perspective view of the main part of the cab support device The figure showing the attachment posture selection mode of the detent restriction plate to the attachment bolt

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cab 2 Floor frame 5 Cab support frame 6 Water mark hole provided in cab support frame 8 Bracket 9 Cutting part 10 Cab support device 11, 11A Damper mount 20 Restriction means 21 Restriction member 22 Shaft body 23 Mounting bolt 23a Bolt head 23a 'hexagonal head corner 24 anti-rotation restricting plate 24a mounting hole 25 locking hole 25a notch 26 lock pin 27 fixed hole 29 fixing bolt

Claims (3)

  The cab is supported on the vehicle body frame via a damper mount, and when the cab is displaced more than a specified amount in the extension direction of the damper mount in the vicinity of the damper mount, the displacement exceeding the specified amount or more is regulated. In the cab support device including the restriction means, the restriction means is a contact member that is in contact with the support frame provided on the vehicle body frame side during operation, restricts the displacement, a mounting bolt that attaches the restriction member to the cab, and A cab support device comprising a detent restricting plate for restricting rotation of the mounting bolt.   The restricting member is attached to the cab with a mounting bolt, and is provided with a separate bolt at a position appropriately separated from the fastening shaft center of the mounting bolt by a detent restricting plate having a locking hole that engages the head of the mounting bolt. The cab support device according to claim 1, wherein the anti-rotation restricting plate is attached to a restricting member to prevent the attachment bolt from loosening.   The locking hole of the anti-rotation restricting plate is formed with a large number of engagement notches that engage with the corners of the bolt head on the inner periphery, and the positional relationship between the mounting bolt and the fixing bolt attaching hole of the anti-rotation restricting plate is made steady. The cab support device according to claim 2, wherein the head of the mounting bolt is locked and held by selecting an engagement cutting position of the locking hole.

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